/* ═══════════════════════════════════════════════════════════════
   LOGIC LATTICE — Multi-Theme Engine
   Themes: Warm Paper (default) · Jungle · Neon City · Midnight Ink ·
           Rose Gold — each theme owns one fixed background image
           (--bg-image) and a color scheme tuned to it.
═══════════════════════════════════════════════════════════════ */
/* Fonts: Crimson Pro and DM Sans are loaded via Google Fonts CDN (external network request required).
   CDN URL: https://fonts.googleapis.com
   To bundle fonts locally instead: download the font files, place them in a /fonts/ folder,
   remove this @import, and replace with @font-face declarations pointing to the local files. */
@import url("https://fonts.googleapis.com/css2?family=Crimson+Pro:wght@400;600&family=DM+Sans:wght@300;400;500&display=swap");
/* Cartoonic Mode font (Settings → Appearance → Cartoonic Mode) */
@import url("https://fonts.googleapis.com/css2?family=Baloo+2:wght@500;600;700;800&display=swap");

/* ── THEME: WARM PAPER (default) — bg-amber.webp ─────────────── */
:root,
body[data-theme="warm"] {
  --bg-image: url("../images/bg-amber.webp");
  --paper: #fff8e6;
  --paper2: #fdecc0;
  --paper3: #f5da9c;
  --ink: #241a08;
  --ink-mid: #5c4a28;
  --ink-dim: #96805a;
  --ink-faint: #d8c49c;
  --accent: #1a1309;
  --accent-lt: #3f3320;
  --accent-bg: rgba(26, 19, 9, 0.1);
  --blue: #1d4ed8;
  --blue-lt: rgba(29, 78, 216, 0.1);
  --row-hl: rgba(26, 19, 9, 0.06);
  --same-hl: rgba(29, 78, 216, 0.1);
  --error-bg: rgba(200, 30, 30, 0.12);
  --error-txt: #c81e1e;
  --success: #1f7a3d;
  --given-bg: rgba(36, 26, 8, 0.06);
  --grid-thin: #e4cf9e;
  --grid-thick: #96794a;
  --box-border: #241a08;
  --cell-bg: #fffdf6;
  --grid-bg: #fffdf6;
  --shadow: 0 4px 20px rgba(60, 40, 8, 0.16);
  --radius: 8px;
  --screen-bg: transparent;
  --card-bg: rgba(255, 255, 255, 0.68);
  --card-border: var(--paper3);
  --btn-primary-bg: var(--ink);
  --btn-primary-color: var(--paper);
  --btn-icon-white: #fffaf0;
  --bg-overlay: linear-gradient(
    160deg,
    rgba(255, 255, 255, 0.12) 0%,
    rgba(110, 62, 8, 0.22) 100%
  );
  --grid-wrap-bg: linear-gradient(145deg, #fff2cc 0%, #f0d18e 100%);
  --grid-wrap-shadow: 0 8px 32px rgba(60, 40, 8, 0.24);
  --grid-wrap-border: #e0b868;
}

/* ── THEME: JUNGLE — bg-jungle.webp ───────────────────────────── */
body[data-theme="jungle"] {
  --bg-image: url("../images/bg-jungle.webp");
  --paper: #062a19;
  --paper2: #0a3a24;
  --paper3: #0f4a2f;
  --ink: #eafbf0;
  --ink-mid: #9fdcb8;
  --ink-dim: #5fa87e;
  --ink-faint: #245a3c;
  --accent: #22c878;
  --accent-lt: #6fe3a3;
  --accent-bg: rgba(34, 200, 120, 0.16);
  --blue: #2bbf8e;
  --blue-lt: rgba(43, 191, 142, 0.14);
  --row-hl: rgba(34, 200, 120, 0.08);
  --same-hl: rgba(43, 191, 142, 0.16);
  --error-bg: rgba(240, 80, 60, 0.18);
  --error-txt: #ff8a75;
  --success: #22c878;
  --given-bg: rgba(234, 251, 240, 0.05);
  --grid-thin: #1a5236;
  --grid-thick: #1c6b42;
  --box-border: #eafbf0;
  --cell-bg: #082e1c;
  --grid-bg: #062a19;
  --shadow: 0 8px 40px rgba(0, 0, 0, 0.55);
  --radius: 4px;
  --screen-bg: transparent;
  --card-bg: rgba(6, 42, 25, 0.82);
  --card-border: #14512f;
  --btn-primary-bg: #22c878;
  --btn-primary-color: #062a19;
  --btn-icon-white: #f2fff6;
  --bg-overlay: linear-gradient(
    160deg,
    rgba(3, 25, 15, 0.42) 0%,
    rgba(2, 14, 8, 0.6) 100%
  );
  --grid-wrap-bg: linear-gradient(145deg, #0d4c2c 0%, #052717 100%);
  --grid-wrap-shadow:
    0 12px 48px rgba(0, 0, 0, 0.6), 0 0 0 2px rgba(34, 200, 120, 0.2);
  --grid-wrap-border: #1a6b3e;
}

/* ── THEME: NEON CITY (aka Obsidian Night) — bg-obsidian.webp ─── */
body[data-theme="neon"] {
  --bg-image: url("../images/bg-obsidian.webp");
  --paper: #141414;
  --paper2: #1c1c1c;
  --paper3: #282828;
  --ink: #f4f4f4;
  --ink-mid: #bcbcbc;
  --ink-dim: #7c7c7c;
  --ink-faint: #3a3a3a;
  --accent: #58c4f0;
  --accent-lt: #8ddcfa;
  --accent-bg: rgba(88, 196, 240, 0.14);
  --blue: #58c4f0;
  --blue-lt: rgba(88, 196, 240, 0.12);
  --row-hl: rgba(88, 196, 240, 0.06);
  --same-hl: rgba(88, 196, 240, 0.14);
  --error-bg: rgba(255, 90, 90, 0.18);
  --error-txt: #ff7070;
  --success: #4fd88a;
  --given-bg: rgba(244, 244, 244, 0.05);
  --grid-thin: #303030;
  --grid-thick: #4a4a4a;
  --box-border: #f4f4f4;
  --cell-bg: #101010;
  --grid-bg: #0c0c0c;
  --shadow: 0 8px 40px rgba(0, 0, 0, 0.55);
  --radius: 0px;
  --screen-bg: transparent;
  --card-bg: rgba(18, 18, 18, 0.86);
  --card-border: #2e2e2e;
  --btn-primary-bg: #f4f4f4;
  --btn-primary-color: #101010;
  --btn-icon-white: #ffffff;
  --bg-overlay: linear-gradient(
    160deg,
    rgba(0, 0, 0, 0.3) 0%,
    rgba(0, 0, 0, 0.52) 100%
  );
  --grid-wrap-bg: linear-gradient(145deg, #1e1e1e 0%, #090909 100%);
  --grid-wrap-shadow:
    0 0 0 1px rgba(88, 196, 240, 0.3), 0 16px 48px rgba(0, 0, 0, 0.5);
  --grid-wrap-border: transparent;
}

/* ── THEME: MIDNIGHT INK — bg-midnight.webp ───────────────────── */
body[data-theme="midnight"] {
  --bg-image: url("../images/bg-midnight.webp");
  --paper: #071335;
  --paper2: #0c1c46;
  --paper3: #122658;
  --ink: #eef2ff;
  --ink-mid: #a8b8e0;
  --ink-dim: #6478a8;
  --ink-faint: #24345c;
  --accent: #3d7dff;
  --accent-lt: #7aa6ff;
  --accent-bg: rgba(61, 125, 255, 0.16);
  --blue: #3d7dff;
  --blue-lt: rgba(61, 125, 255, 0.12);
  --row-hl: rgba(61, 125, 255, 0.08);
  --same-hl: rgba(61, 125, 255, 0.14);
  --error-bg: rgba(220, 60, 80, 0.18);
  --error-txt: #ff7a8a;
  --success: #4fd88a;
  --given-bg: rgba(238, 242, 255, 0.05);
  --grid-thin: #1c2c54;
  --grid-thick: #2e4680;
  --box-border: #eef2ff;
  --cell-bg: #0a1a40;
  --grid-bg: #061230;
  --shadow: 0 8px 40px rgba(0, 0, 0, 0.55);
  --radius: 6px;
  --screen-bg: transparent;
  --card-bg: rgba(7, 19, 53, 0.82);
  --card-border: #1a2c58;
  --btn-primary-bg: #3d7dff;
  --btn-primary-color: #071335;
  --btn-icon-white: #f4f7ff;
  --bg-overlay: linear-gradient(
    160deg,
    rgba(1, 8, 30, 0.32) 0%,
    rgba(1, 4, 20, 0.52) 100%
  );
  --grid-wrap-bg: linear-gradient(145deg, #0e2050 0%, #050f28 100%);
  --grid-wrap-shadow:
    0 0 0 1px rgba(61, 125, 255, 0.3), 0 16px 48px rgba(0, 0, 0, 0.5);
  --grid-wrap-border: #24407a;
}

/* ════════════════════════════════════════════════
   THEME: ROSE GOLD (5th theme) — bg-crimson.webp
════════════════════════════════════════════════ */
body[data-theme="rosegold"] {
  --bg-image: url("../images/bg-crimson.webp");
  --paper: #2a0a08;
  --paper2: #3a0f0c;
  --paper3: #4a1512;
  --ink: #fff1ec;
  --ink-mid: #e0a89a;
  --ink-dim: #f0c2b4;
  --ink-faint: #4a1f1a;
  --accent: #ff3b3b;
  --accent-lt: #ff7a5c;
  --accent-bg: rgba(255, 59, 59, 0.16);
  --blue: #ff3b3b;
  --blue-lt: rgba(255, 59, 59, 0.14);
  --row-hl: rgba(255, 59, 59, 0.08);
  --same-hl: rgba(255, 59, 59, 0.16);
  --error-bg: rgba(255, 140, 60, 0.18);
  --error-txt: #ffab70;
  --success: #4fd88a;
  --given-bg: rgba(255, 241, 236, 0.05);
  --grid-thin: #3a1512;
  --grid-thick: #5a221c;
  --box-border: #fff1ec;
  --cell-bg: #1c0806;
  --grid-bg: #170605;
  --shadow: 0 8px 40px rgba(0, 0, 0, 0.55);
  --radius: 10px;
  --screen-bg: transparent;
  --card-bg: rgba(30, 8, 6, 0.68);
  --card-border: #4a1512;
  --btn-primary-bg: #ff3b3b;
  --btn-primary-color: #1c0806;
  --btn-icon-white: #ffffff;
  --bg-overlay: linear-gradient(
    160deg,
    rgba(10, 2, 2, 0.18) 0%,
    rgba(5, 1, 1, 0.34) 100%
  );
  --grid-wrap-bg: linear-gradient(145deg, #3a100c 0%, #150504 100%);
  --grid-wrap-shadow:
    0 0 0 1px rgba(255, 59, 59, 0.3), 0 16px 48px rgba(0, 0, 0, 0.5);
  --grid-wrap-border: #5a221c;
}

/* Rose Gold brand glow */
body[data-theme="rosegold"] .brand,
body[data-theme="rosegold"] .loading-brand {
  text-shadow:
    0 0 24px rgba(255, 59, 59, 0.6),
    0 2px 12px rgba(0, 0, 0, 0.5);
}

/* Rose Gold popup rule line */
body[data-theme="rosegold"] .popup-rule-line {
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

/* Rose Gold — accent-colored text is too close to the red background to
   read; keep the accent underline but lighten the label itself. */
body[data-theme="rosegold"] .lb-tab.active {
  color: var(--ink);
}

/* Rose Gold theme preview */
.theme-preview--rosegold {
  background: linear-gradient(145deg, #3a100c, #150504);
  border: 1.5px solid #ff3b3b;
  position: relative;
  overflow: hidden;
}
.theme-preview--rosegold::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at 30% 30%,
    rgba(255, 59, 59, 0.14) 0%,
    transparent 55%
  );
}
.theme-preview--rosegold .tp-grid {
  border-color: #ff3b3b;
  border-radius: 3px;
  overflow: hidden;
}
.theme-preview--rosegold .tp-cell {
  background: #1c0806;
  border-right: 1px solid #3a1512;
  border-bottom: 1px solid #3a1512;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(9px, 2.5vw, 13px);
  font-weight: 600;
  color: #ff3b3b;
  aspect-ratio: 1;
}
.theme-preview--rosegold .tp-cell.tp-given {
  background: rgba(255, 241, 236, 0.06);
  color: #fff1ec;
}
.theme-preview--rosegold .tp-cell.tp-sel {
  background: rgba(255, 59, 59, 0.22);
  color: #ff3b3b;
}
.theme-preview--rosegold .tp-cell.tp-br {
  border-right: 2px solid #5a221c;
}
.theme-preview--rosegold .tp-cell.tp-bb {
  border-bottom: 2px solid #5a221c;
}

/* ════════════════════════════════════════════════
   PARTICLES CANVAS
════════════════════════════════════════════════ */
#particles-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

/* ════════════════════════════════════════════════
   CONFETTI CANVAS (complete screen)
════════════════════════════════════════════════ */
#confetti-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}
#s-complete > *:not(#confetti-canvas) {
  position: relative;
  z-index: 1;
}

/* NOTE: .lobby-xp-bar / .lobby-xp-level / .lobby-xp-track / .lobby-xp-fill /
   .lobby-xp-pts are styled in the LOBBY SCREEN section below, as part of
   the dashboard card design. */

/* ════════════════════════════════════════════════
   ACHIEVEMENT BADGES (lobby)
════════════════════════════════════════════════ */
.lobby-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  max-width: 340px;
  margin-bottom: 0;
  min-height: 0;
}
.lobby-badge {
  padding: 4px 10px;
  background: var(--card-bg);
  border: 1px solid var(--ink-faint);
  border-radius: 20px;
  font-size: 0.52rem;
  letter-spacing: 0.15em;
  color: var(--ink-dim);
  text-transform: uppercase;
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  gap: 5px;
  animation: badgePop 0.35s cubic-bezier(0.34, 1.4, 0.64, 1) both;
}
.lobby-badge.gold {
  border-color: var(--accent);
  color: var(--accent);
}
@keyframes badgePop {
  from {
    opacity: 0;
    transform: scale(0.7);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Achievement banner on complete screen */
.achievement-banner {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 10px 0;
  max-width: 300px;
  width: 100%;
}
.achievement-item {
  padding: 8px 14px;
  background: var(--accent-bg);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  color: var(--accent);
  text-transform: uppercase;
  text-align: center;
  animation: badgePop 0.4s cubic-bezier(0.34, 1.4, 0.64, 1) both;
}

/* ════════════════════════════════════════════════
   XP display on complete screen
════════════════════════════════════════════════ */
#comp-xp {
  color: var(--success) !important;
}

/* ════════════════════════════════════════════════
   HINTS REMAINING display
════════════════════════════════════════════════ */
#hints-remaining-wrap {
  display: none;
}
#hints-remaining-wrap.visible {
  display: flex;
}

/* ════════════════════════════════════════════════
   TIME ATTACK BAR
════════════════════════════════════════════════ */
.time-attack-bar {
  width: 100%;
  max-width: 520px;
  height: 3px;
  background: var(--ink-faint);
  display: none;
  margin-bottom: 4px;
  border-radius: 2px;
  overflow: hidden;
  align-self: center;
}
.time-attack-bar.visible {
  display: block;
}
.time-attack-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition:
    width 1s linear,
    background 0.5s;
  width: 100%;
}
.time-attack-fill.danger {
  background: var(--error-txt);
}

/* ════════════════════════════════════════════════
   CUSTOM PUZZLE IMPORT ROW
════════════════════════════════════════════════ */
.import-row {
  width: 100%;
  max-width: 360px;
  margin-bottom: 12px;
}
.import-toggle {
  background: none;
  border: none;
  color: var(--ink-dim);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 0;
  transition: color 0.18s;
}
.import-toggle:hover {
  color: var(--accent);
}
.import-toggle svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}
.import-panel {
  display: none;
  gap: 8px;
  margin-top: 8px;
}
.import-panel.open {
  display: flex;
}
.import-input {
  flex: 1;
  padding: 8px 12px;
  background: var(--card-bg);
  border: 1px solid var(--ink-faint);
  border-radius: var(--radius);
  color: var(--ink);
  font-family: monospace;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  outline: none;
  backdrop-filter: blur(8px);
  transition: border-color 0.18s;
}
.import-input:focus {
  border-color: var(--accent);
}
.import-btn {
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.92);
  border: none;
  border-radius: var(--radius);
  color: var(--ink);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.18s;
  white-space: nowrap;
}
.import-btn:hover {
  background: var(--accent);
  color: var(--btn-primary-color);
}

/* ════════════════════════════════════════════════
   LEADERBOARD SCREEN
════════════════════════════════════════════════ */
#s-leaderboard,
#s-achievements {
  justify-content: flex-start;
  align-items: stretch;
  padding: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

#s-leaderboard .page-header,
#s-achievements .page-header {
  align-self: center;
  flex-shrink: 0;
  width: 100%;
  max-width: 460px;
}

#s-leaderboard .lb-tabs,
#s-leaderboard .lb-clear {
  align-self: center;
}

#s-leaderboard .lb-list,
#s-achievements .lb-list {
  align-self: center;
}
.lb-tabs {
  display: flex;
  gap: 0;
  max-width: 460px;
  align-self: center;
  width: 100%;
  padding: 12px clamp(18px, 5vw, 32px) 0;
}
.lb-tab {
  flex: 1;
  padding: 8px;
  background: none;
  border: none;
  border-bottom: 2px solid var(--ink-faint);
  color: var(--ink-dim);
  font-family: "DM Sans", sans-serif;
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.18s;
}
.lb-tab.active {
  border-bottom-color: var(--accent);
  color: var(--accent);
}
.lb-list {
  flex: 1;
  max-width: 460px;
  align-self: center;
  width: 100%;
  padding: clamp(14px, 3vw, 20px) clamp(18px, 5vw, 32px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
}
.lb-entry {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  animation: badgePop 0.3s cubic-bezier(0.34, 1.4, 0.64, 1) both;
}
.lb-rank {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--ink-dim);
  min-width: 24px;
  text-align: center;
}
.lb-entry:nth-child(1) .lb-rank {
  color: #d4a820;
}
.lb-entry:nth-child(2) .lb-rank {
  color: #a0a8b0;
}
.lb-entry:nth-child(3) .lb-rank {
  color: #c07840;
}
.lb-time {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--accent);
  flex: 1;
}
.lb-meta {
  font-size: 0.55rem;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
  text-transform: uppercase;
  text-align: right;
}
.lb-empty {
  text-align: center;
  color: var(--ink-dim);
  font-size: 0.75rem;
  padding: 40px 0;
  letter-spacing: 0.1em;
}
.lb-clear {
  align-self: center;
  background: none;
  border: 1px solid var(--ink-faint);
  border-radius: var(--radius);
  color: var(--ink-dim);
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 7px 16px;
  cursor: pointer;
  margin: 0 0 24px;
  transition: all 0.18s;
}
.lb-clear:hover {
  border-color: var(--error-txt);
  color: var(--error-txt);
}

/* ════════════════════════════════════════════════
   ACHIEVEMENTS PAGE (reuses .lb-list / .lb-entry)
════════════════════════════════════════════════ */
.lb-entry.locked {
  opacity: 0.45;
}
.lb-entry.locked .lb-rank {
  color: var(--ink-faint);
}
.lb-entry.locked .lb-time {
  color: var(--ink-dim);
}
.lb-entry.ach-entry .lb-rank svg {
  width: 1.3em;
  height: 1.3em;
  fill: currentColor;
}
.lb-entry:not(.locked).ach-entry .lb-rank {
  color: var(--accent);
}

/* "See More" pill in the lobby badges row */
.lobby-badge-more {
  cursor: pointer;
  font-family: "DM Sans", sans-serif;
  border-color: var(--accent);
  color: var(--accent);
}
.lobby-badge-more:hover {
  background: var(--accent-bg);
}

/* ════════════════════════════════════════════════
   AD POPUP SCREEN
════════════════════════════════════════════════ */

/* Ad popup — full-screen layout, no card wrapper */
.sponsor-card {
  max-width: 400px !important;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.sponsor-header {
  text-align: center;
  margin-bottom: 20px;
  width: 100%;
}
.sponsor-series-label {
  font-size: 0.55rem;
  letter-spacing: 0.5em;
  color: var(--ink-mid);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.sponsor-title {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(1.7rem, 7.5vw, 3.2rem);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.15;
  margin-bottom: 6px;
  white-space: normal;
}
.sponsor-title br {
  content: "";
}
.sponsor-sub {
  font-size: 0.62rem;
  letter-spacing: 0.28em;
  color: var(--ink-mid);
  text-transform: uppercase;
}

.sponsor-slot-wrap {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  margin-bottom: 20px;
}
.sponsor-slot-label {
  font-size: 0.5rem;
  letter-spacing: 0.4em;
  color: var(--ink-mid);
  text-transform: uppercase;
  align-self: center;
  text-align: center;
}
.sponsor-iframe {
  width: 300px;
  height: 250px;
  border: 0;
  display: block;
}
.sponsor-slot {
  width: 300px;
  height: 250px;
  border: 1.5px dashed var(--accent);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}
.sponsor-placeholder {
  text-align: center;
  color: var(--ink-dim);
  padding: 20px;
}
.sponsor-placeholder-size {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
  letter-spacing: 0.04em;
}
.sponsor-placeholder-hint {
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  line-height: 1.7;
  color: var(--ink-mid);
}

.sponsor-footer {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
}
.sponsor-thanks {
  font-size: 0.5rem;
  letter-spacing: 0.4em;
  color: var(--ink-mid);
  text-transform: uppercase;
}
.sponsor-skip-btn {
  padding: 0.75em 2em;
  background: rgba(255, 255, 255, 0.92);
  border: none;
  border-radius: var(--radius);
  color: var(--ink);
  font-family: "DM Sans", sans-serif;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    background 0.2s,
    opacity 0.2s;
  width: 100%;
}
.sponsor-skip-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.sponsor-skip-btn:not(:disabled):hover {
  background: var(--accent);
  color: var(--btn-primary-color);
}

/* ════════════════════════════════════════════════
   DAILY CHALLENGE DIFF CARD
════════════════════════════════════════════════ */
.diff-card[data-diff="daily"] {
  grid-column: 1 / -1;
}
.diff-card[data-diff="daily"] .diff-name {
  position: relative;
}
.daily-badge {
  display: inline-block;
  font-size: 0.38rem;
  letter-spacing: 0.18em;
  color: var(--btn-primary-color);
  background: var(--accent);
  padding: 2px 6px;
  border-radius: 10px;
  text-transform: uppercase;
  vertical-align: middle;
  margin-left: 4px;
}

/* Daily done state */
.diff-card[data-diff="daily"].daily-done {
  opacity: 0.6;
}
.diff-card[data-diff="daily"].daily-done::after {
  content: "\2713 Done today";
  display: block;
  font-size: 0.48rem;
  letter-spacing: 0.18em;
  color: var(--success);
  margin-top: 3px;
  text-transform: uppercase;
}

/* ════════════════════════════════════════════════
   STAT-TIME hidden state (when timer disabled)
════════════════════════════════════════════════ */
#stat-time-wrap.hidden {
  display: none;
}

/* ════════════════════════════════════════════════
   RESET & BASE
════════════════════════════════════════════════ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  width: 100%;
  height: 100%;
  color: var(--ink);
  font-family: "DM Sans", system-ui, sans-serif;
  overflow: hidden;
  transition:
    background 0.4s,
    color 0.4s;
}

/* ── BACKGROUND: fixed per-theme image + matching gradient overlay ─── */
/* Each theme now owns exactly one background image (--bg-image),
   set alongside its color variables above. No user-facing picker. */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  background-image: var(--bg-image);
  background-size: cover;
  background-position: center;
  z-index: -2;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  z-index: -1;
  transition: background 0.4s;
}

/* Neon City — subtle scanline texture layered over its image */
body[data-theme="neon"]::after {
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(88, 196, 240, 0.025) 2px,
      rgba(88, 196, 240, 0.025) 4px
    ),
    var(--bg-image);
  background-size: auto, cover;
  background-position: auto, center;
}

/* ════════════════════════════════════════════════
   SCREENS
════════════════════════════════════════════════ */
.screen {
  position: fixed;
  inset: 0;
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  transition:
    opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  background: transparent;
}
.screen.out {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.97) translateY(10px);
}

#s-loading {
  background: transparent;
}

/* ════════════════════════════════════════════════
   SHARED BRAND
════════════════════════════════════════════════ */
.loading-brand,
.brand {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(4.5rem, 15vw, 8rem);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
  line-height: 0.85;
  text-align: center;
  margin-bottom: clamp(14px, 2.5vh, 22px);
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.18);
}
.loading-brand-dot,
.brand-dot {
  color: var(--accent);
}

.loading-sub {
  font-size: clamp(0.65rem, 2.2vw, 0.85rem);
  letter-spacing: 0.55em;
  text-indent: 0.55em;
  text-align: center;
  color: var(--ink-dim);
  text-transform: uppercase;
  margin-bottom: clamp(24px, 5vh, 40px);
}
.brand-sub {
  font-size: clamp(0.65rem, 2.2vw, 0.85rem);
  letter-spacing: 0.55em;
  text-indent: 0.55em;
  text-align: center;
  color: var(--ink-dim);
  text-transform: uppercase;
  margin-bottom: clamp(30px, 6vh, 52px);
  text-shadow: 0 1px 8px rgba(255, 255, 255, 0.4);
}

/* Light themes: boost slogan contrast over varied backgrounds */
body[data-theme="warm"] .brand-sub,
body[data-theme="rosegold"] .brand-sub {
  color: var(--ink-mid);
  text-shadow: 0 1px 6px rgba(255, 255, 255, 0.6);
}

/* Warm theme: headings/logo text in white instead of dark ink */
body[data-theme="warm"] .brand,
body[data-theme="warm"] .loading-brand,
body[data-theme="warm"] .popup-brand,
body[data-theme="warm"] .diff-heading,
body[data-theme="warm"] .page-title,
body[data-theme="warm"] .top-title {
  color: #fffaf0;
  text-shadow:
    0 2px 10px rgba(36, 26, 8, 0.45),
    0 0 1px rgba(36, 26, 8, 0.3);
}

/* Jungle brand glow */
body[data-theme="jungle"] .brand,
body[data-theme="jungle"] .loading-brand {
  text-shadow:
    0 0 30px rgba(34, 200, 120, 0.5),
    0 2px 16px rgba(0, 0, 0, 0.6);
}

/* Neon brand glow */
body[data-theme="neon"] .brand,
body[data-theme="neon"] .loading-brand {
  text-shadow:
    0 0 20px rgba(88, 196, 240, 0.8),
    0 0 60px rgba(88, 196, 240, 0.4);
}

/* Midnight brand glow */
body[data-theme="midnight"] .brand,
body[data-theme="midnight"] .loading-brand {
  text-shadow:
    0 0 24px rgba(61, 125, 255, 0.6),
    0 2px 12px rgba(0, 0, 0, 0.5);
}

/* ════════════════════════════════════════════════
   LOADING SCREEN
════════════════════════════════════════════════ */
#s-loading {
  gap: 0;
  z-index: 50;
}

.loading-bar-wrap {
  width: clamp(160px, 44vw, 240px);
  height: 2px;
  background: var(--ink-faint);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 16px;
}
.loading-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-lt));
  border-radius: 2px;
  transition: width 0.08s linear;
}
.loading-hint {
  font-size: 0.6rem;
  letter-spacing: 0.32em;
  text-indent: 0.32em;
  text-align: center;
  color: var(--ink-dim);
  text-transform: uppercase;
}

/* ════════════════════════════════════════════════
   LOBBY SCREEN
════════════════════════════════════════════════ */
#s-lobby {
  padding: clamp(18px, 4vh, 32px);
  gap: 0;
}

/* ── Corner-pinned icon buttons ── */
.lobby-corner {
  position: absolute;
  z-index: 6;
  display: flex;
  gap: clamp(16px, 3vh, 22px);
}
.lobby-corner-tl {
  top: clamp(16px, 4vh, 28px);
  left: clamp(16px, 4vw, 28px);
  flex-direction: column;
  align-items: flex-start;
}
.lobby-corner-tr {
  top: clamp(16px, 4vh, 28px);
  right: clamp(16px, 4vw, 28px);
  flex-direction: column;
  align-items: flex-end;
}
.lobby-corner-bl {
  bottom: clamp(16px, 4vh, 28px);
  left: clamp(16px, 4vw, 28px);
  flex-direction: row;
}
.lobby-corner-br {
  bottom: clamp(16px, 4vh, 28px);
  right: clamp(16px, 4vw, 28px);
  flex-direction: column;
  align-items: flex-end;
}

/* ── Hero zone: brand + tagline + play button + mode chips, centered by
   the .screen base flex rules ── */
.lobby-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.lobby-hero-tag {
  font-size: clamp(0.6rem, 2vw, 0.78rem);
  letter-spacing: 0.45em;
  text-indent: 0.45em;
  color: var(--ink-dim);
  text-transform: uppercase;
  padding: 7px 18px;
  border: 1px solid var(--ink-faint);
  border-radius: 20px;
  background: var(--card-bg);
  backdrop-filter: blur(8px);
  margin-top: clamp(4px, 1.2vh, 10px);
  margin-bottom: clamp(10px, 2.5vh, 20px);
}

/* ── Mode preview chips under the play button ── */
.lobby-mode-chips {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: clamp(14px, 3vh, 24px);
}
.lobby-mode-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 20px;
  backdrop-filter: blur(8px);
  font-size: 0.62rem;
  letter-spacing: 0.05em;
  color: var(--ink-mid);
}
.lobby-mode-chip svg {
  width: 15px;
  height: 15px;
  fill: var(--accent);
  flex-shrink: 0;
}

/* Dark themes — chip text needs a dark color to stay visible on the white chip bg */
body[data-theme="jungle"] .lobby-mode-chip,
body[data-theme="neon"] .lobby-mode-chip,
body[data-theme="midnight"] .lobby-mode-chip,
body[data-theme="rosegold"] .lobby-mode-chip {
  color: var(--btn-primary-color);
}

/* XP row: icon badge + level/points/track stacked */
.lobby-xp-bar {
  width: 100%;
  max-width: none;
  margin-bottom: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}
.lobby-xp-icon {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--accent) 0%, var(--accent-lt) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
}
.lobby-xp-icon svg {
  width: 19px;
  height: 19px;
  fill: var(--btn-primary-color);
}
.lobby-xp-text {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.lobby-xp-toprow {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}
.lobby-xp-level {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--ink);
  font-weight: 600;
  text-transform: uppercase;
  white-space: nowrap;
}
.lobby-xp-track {
  flex: 1;
  height: 5px;
  background: var(--ink-faint);
  border-radius: 3px;
  overflow: hidden;
}
.lobby-xp-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-lt));
  border-radius: 3px;
  transition: width 0.6s ease;
  width: 0%;
}
.lobby-xp-pts {
  font-size: 0.55rem;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  white-space: nowrap;
}

/* Big play button — modern fancy style with glow ring + pulse */
.lobby-center {
  position: relative;
}
.lobby-center::before {
  content: "";
  position: absolute;
  inset: 50%;
  width: clamp(210px, 46vw, 300px);
  height: clamp(210px, 46vw, 300px);
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  opacity: 0.25;
  filter: blur(18px);
  animation: playGlowPulse 2.6s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}
@keyframes playGlowPulse {
  0%,
  100% {
    transform: translate(-50%, -50%) scale(0.92);
    opacity: 0.2;
  }
  50% {
    transform: translate(-50%, -50%) scale(1.08);
    opacity: 0.4;
  }
}

.btn-play-big {
  width: clamp(180px, min(38vw, 32vh), 250px);
  height: clamp(180px, min(38vw, 32vh), 250px);
  margin: clamp(24px, 5vh, 40px) 0;
  border-radius: 50%;
  background: linear-gradient(
    145deg,
    var(--accent) 0%,
    var(--btn-primary-bg) 100%
  );
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  transition:
    transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1),
    box-shadow 0.25s ease,
    border-radius 0.25s ease;
  box-shadow:
    0 16px 40px rgba(0, 0, 0, 0.35),
    0 0 0 6px var(--card-bg),
    0 0 0 8px color-mix(in srgb, var(--accent) 35%, transparent),
    inset 0 2px 6px rgba(255, 255, 255, 0.25),
    inset 0 -6px 14px rgba(0, 0, 0, 0.25);
  flex-shrink: 0;
  animation: playFloat 3.2s ease-in-out infinite;
}
@keyframes playFloat {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}
.btn-play-big::after {
  content: "";
  position: absolute;
  inset: 8%;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.18);
  pointer-events: none;
}
.btn-play-big:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow:
    0 22px 56px rgba(0, 0, 0, 0.4),
    0 0 0 6px var(--card-bg),
    0 0 0 10px color-mix(in srgb, var(--accent) 55%, transparent),
    inset 0 2px 6px rgba(255, 255, 255, 0.3),
    inset 0 -6px 14px rgba(0, 0, 0, 0.25);
}
.btn-play-big:active {
  transform: translateY(-1px) scale(1.02);
}
/* The grid SVG icon */
.btn-play-icon {
  width: 56%;
  height: 56%;
  display: block;
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.25));
}
/* Grid cells fill white — matches the theme's logo/white tone */
.btn-play-icon rect {
  fill: var(--btn-icon-white);
  opacity: 0.65;
  transition: opacity 0.2s;
}
.btn-play-big:hover .btn-play-icon rect {
  opacity: 0.75;
}
/* Center cell slightly dimmer so the arrow stands out */
.btn-play-center-cell {
  opacity: 0.3 !important;
}
/* Play arrow on top */
.btn-play-arrow {
  fill: var(--btn-icon-white);
  opacity: 1;
  transform-origin: center;
  transition: transform 0.25s ease;
}
.btn-play-big:hover .btn-play-arrow {
  transform: scale(1.12);
}

/* Warm play button — blackish gradient instead of pink accent */
body[data-theme="warm"] .btn-play-big {
  background: linear-gradient(145deg, var(--ink-mid) 0%, var(--ink) 100%);
  box-shadow:
    0 0 0 6px var(--card-bg),
    0 0 0 9px rgba(36, 26, 8, 0.35),
    0 14px 40px rgba(36, 26, 8, 0.4),
    inset 0 2px 6px rgba(255, 255, 255, 0.15);
}

/* Neon play button glow */
body[data-theme="neon"] .btn-play-big {
  background: linear-gradient(145deg, var(--accent) 0%, #1a0a14 100%);
  box-shadow:
    0 0 0 6px var(--card-bg),
    0 0 0 9px var(--accent),
    0 14px 50px rgba(88, 196, 240, 0.5),
    inset 0 2px 6px rgba(255, 255, 255, 0.2);
}
body[data-theme="neon"] .lobby-center::before {
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  opacity: 0.4;
}
body[data-theme="neon"] .btn-play-big:hover {
  box-shadow:
    0 0 0 6px var(--card-bg),
    0 0 0 10px var(--accent),
    0 18px 64px rgba(88, 196, 240, 0.7),
    inset 0 2px 6px rgba(255, 255, 255, 0.25);
}

/* Jungle play button glow */
body[data-theme="jungle"] .btn-play-big {
  background: linear-gradient(145deg, var(--accent) 0%, #1c3a22 100%);
  box-shadow:
    0 0 0 6px var(--card-bg),
    0 0 0 9px rgba(34, 200, 120, 0.45),
    0 14px 40px rgba(0, 0, 0, 0.6),
    inset 0 2px 6px rgba(255, 255, 255, 0.2);
}

/* Midnight play button glow */
body[data-theme="midnight"] .btn-play-big {
  background: linear-gradient(145deg, var(--accent) 0%, #1c1a30 100%);
  box-shadow:
    0 0 0 6px var(--card-bg),
    0 0 0 9px rgba(61, 125, 255, 0.4),
    0 14px 40px rgba(61, 125, 255, 0.3),
    inset 0 2px 6px rgba(255, 255, 255, 0.2);
}

/* Rose Gold play button — softer gradient, less intense flat red */
body[data-theme="rosegold"] .btn-play-big {
  background: linear-gradient(145deg, var(--accent-lt) 0%, var(--accent) 100%);
  box-shadow:
    0 0 0 6px var(--card-bg),
    0 0 0 9px rgba(255, 59, 59, 0.35),
    0 14px 40px rgba(0, 0, 0, 0.5),
    inset 0 2px 6px rgba(255, 255, 255, 0.2);
}

/* Lobby stats strip — sits inside the dashboard card */
.lobby-meta {
  width: 100%;
  max-width: none;
  margin-bottom: 0;
}
.lobby-stat-row {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 4px;
  background: none;
  border: none;
  padding: 0;
}
.lobby-stat {
  flex: 1;
  text-align: center;
  padding: 4px 6px;
  background: none;
  border: none;
  border-right: 1px solid var(--ink-faint);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  transition: transform 0.15s;
}
.lobby-stat:last-child {
  border-right: none;
}
.lobby-stat:hover {
  transform: translateY(-2px);
}
.lobby-stat-icon {
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.lobby-stat-icon svg {
  width: 100%;
  height: 100%;
  fill: var(--accent);
  opacity: 0.85;
}
.lobby-stat-val {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(1.15rem, 4vw, 1.5rem);
  font-weight: 600;
  color: var(--ink);
  line-height: 1;
}
.lobby-stat-lbl {
  font-size: 0.48rem;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
  text-transform: uppercase;
}

/* Hide stat row when no stats are available */
.lobby-stat-row.hidden {
  display: none;
}
.lobby-meta:has(.lobby-stat-row.hidden) {
  display: none;
}

/* Corner icon buttons — sized for 1-2 per corner */
.lobby-corner .icon-btn {
  width: clamp(46px, 11vw, 58px);
  height: clamp(46px, 11vw, 58px);
}
.icon-btn {
  width: clamp(52px, 13vw, 68px);
  height: clamp(52px, 13vw, 68px);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.82);
  border: 1.5px solid rgba(0, 0, 0, 0.08);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    border-color 0.2s,
    color 0.2s,
    transform 0.15s,
    box-shadow 0.2s;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
  color: var(--ink-mid);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.icon-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}
.icon-btn svg {
  width: 46%;
  height: 46%;
  fill: currentColor;
  display: block;
}
.icon-btn.sound-muted {
  color: var(--ink-faint);
}
#btn-lobby-cartoonic.cartoonic-active {
  color: var(--accent);
  border-color: var(--accent);
}

/* Neon icon btns */
body[data-theme="neon"] .icon-btn {
  border-radius: 0;
  color: var(--btn-primary-color);
}
body[data-theme="neon"] .icon-btn:hover {
  box-shadow: 0 0 16px rgba(88, 196, 240, 0.3);
}

/* Warm theme — Import Puzzle toggle text was too light (--ink-dim) against
   the paper background, darken it for better visibility */
body[data-theme="warm"] .import-toggle {
  color: var(--ink-mid);
}

/* Dark themes — icon glyphs need a dark color to stay visible on the white button bg */
body[data-theme="jungle"] .icon-btn,
body[data-theme="midnight"] .icon-btn,
body[data-theme="rosegold"] .icon-btn {
  color: var(--btn-primary-color);
}

/* Dark themes — white primary/action buttons need dark text instead of the light --ink */
body[data-theme="jungle"] .import-btn,
body[data-theme="jungle"] .sponsor-skip-btn,
body[data-theme="jungle"] .btn-begin,
body[data-theme="jungle"] .btn-comp.filled,
body[data-theme="jungle"] .popup-btn-primary,
body[data-theme="jungle"] .confirm-ok,
body[data-theme="neon"] .import-btn,
body[data-theme="neon"] .sponsor-skip-btn,
body[data-theme="neon"] .btn-begin,
body[data-theme="neon"] .btn-comp.filled,
body[data-theme="neon"] .popup-btn-primary,
body[data-theme="neon"] .confirm-ok,
body[data-theme="midnight"] .import-btn,
body[data-theme="midnight"] .sponsor-skip-btn,
body[data-theme="midnight"] .btn-begin,
body[data-theme="midnight"] .btn-comp.filled,
body[data-theme="midnight"] .popup-btn-primary,
body[data-theme="midnight"] .confirm-ok,
body[data-theme="rosegold"] .import-btn,
body[data-theme="rosegold"] .sponsor-skip-btn,
body[data-theme="rosegold"] .btn-begin,
body[data-theme="rosegold"] .btn-comp.filled,
body[data-theme="rosegold"] .popup-btn-primary,
body[data-theme="rosegold"] .confirm-ok {
  color: var(--btn-primary-color);
}

/* ════════════════════════════════════════════════
   DIFFICULTY SCREEN
════════════════════════════════════════════════ */
#s-difficulty {
  gap: 0;
}

.diff-back-btn {
  position: absolute;
  top: clamp(14px, 3vw, 24px);
  left: clamp(14px, 3vw, 24px);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1.5px solid var(--ink-mid);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-mid);
  transition: all 0.18s;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.diff-back-btn:hover {
  border-color: var(--ink);
  color: var(--ink);
  background: var(--accent-bg);
}
.diff-back-btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.diff-heading {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(3rem, 10vw, 6rem);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
  line-height: 1.05;
  margin-bottom: clamp(14px, 2.5vh, 24px);
  text-align: center;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.18);
}
.diff-heading-dot {
  color: var(--accent);
}

.diff-subheading {
  font-size: clamp(0.62rem, 2vw, 0.8rem);
  letter-spacing: 0.38em;
  text-indent: 0.38em;
  text-align: center;
  color: var(--ink-dim);
  text-transform: uppercase;
  margin-bottom: clamp(24px, 5vh, 40px);
}

.diff-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  width: 100%;
  max-width: 360px;
  margin-bottom: 24px;
}
.diff-card {
  background: var(--card-bg);
  border: 1.5px solid var(--card-border);
  border-radius: var(--radius);
  padding: clamp(14px, 3vw, 22px) 10px;
  cursor: pointer;
  text-align: center;
  transition:
    border-color 0.2s,
    transform 0.15s,
    box-shadow 0.2s;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.diff-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.16);
}
.diff-card.selected {
  border-color: var(--accent);
  background: var(--accent-bg);
  box-shadow: 0 0 0 3px var(--accent-bg);
}
.diff-icon-wrap {
  width: 32px;
  height: 32px;
  margin: 0 auto 8px;
  color: var(--ink-dim);
  transition: color 0.2s;
}
.diff-card.selected .diff-icon-wrap,
.diff-card:hover .diff-icon-wrap {
  color: var(--accent);
}
.diff-icon-wrap svg {
  width: 100%;
  height: 100%;
}
.diff-name {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.04em;
}
.diff-desc {
  font-size: 0.58rem;
  color: var(--ink-dim);
  margin-top: 3px;
}

/* Light themes: ensure card text stays readable over both backgrounds */
body[data-theme="warm"] .diff-name,
body[data-theme="rosegold"] .diff-name {
  color: var(--ink);
}
body[data-theme="warm"] .diff-desc,
body[data-theme="rosegold"] .diff-desc {
  color: var(--ink-mid);
}

.btn-begin {
  width: 100%;
  max-width: 360px;
  padding: 0.95em 2em;
  background: rgba(255, 255, 255, 0.92);
  border: none;
  border-radius: var(--radius);
  color: var(--ink);
  font-family: "DM Sans", sans-serif;
  font-size: 0.88rem;
  letter-spacing: 0.18em;
  cursor: pointer;
  text-transform: uppercase;
  transition:
    background 0.2s,
    transform 0.15s,
    box-shadow 0.2s;
}
.btn-begin:hover {
  background: var(--accent);
  color: var(--btn-primary-color);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.22);
}

/* ════════════════════════════════════════════════
   THEME SELECT SCREEN
════════════════════════════════════════════════ */
#s-theme {
  gap: 0;
  overflow-y: auto;
}

/* Theme grid: 3-col same as diff-grid but allow 5th card full-width */
.theme-diff-grid {
  grid-template-columns: repeat(3, 1fr);
  max-width: 360px;
}

.theme-diff-card:last-child:nth-child(3n + 2) {
  grid-column: 2 / 4;
}
.theme-diff-card:last-child:nth-child(3n + 1) {
  grid-column: 1 / -1;
}

/* When there are exactly 5 cards, the 5th spans last 2 cols */
.theme-diff-grid .theme-diff-card:nth-child(4):last-child {
  grid-column: 1 / -1;
}
.theme-diff-grid .theme-diff-card:nth-child(5) {
  grid-column: 2 / 4;
}

/* Icon wrap holds the mini-preview */
.theme-icon-wrap {
  width: 100% !important;
  height: auto !important;
  margin-bottom: 8px !important;
  color: inherit !important;
}

.theme-icon-wrap .theme-preview {
  width: 100%;
  aspect-ratio: 1;
  border-radius: calc(var(--radius) - 4px);
  overflow: hidden;
  margin-bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
}

/* Preview backgrounds */
.theme-preview--warm {
  background: linear-gradient(145deg, #ffe8ab, #fdb802);
  border: 1.5px solid #b8823a;
}
.theme-preview--jungle {
  background: linear-gradient(145deg, #0f4a2f, #051d12);
  border: 1.5px solid #1a6b3e;
  position: relative;
  overflow: hidden;
}
.theme-preview--jungle::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(
      circle at 20% 30%,
      rgba(34, 200, 120, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 70%,
      rgba(43, 191, 142, 0.08) 0%,
      transparent 50%
    );
}
.theme-preview--neon {
  background: linear-gradient(145deg, #1e1e1e, #060606);
  border: 1.5px solid #58c4f0;
  box-shadow: inset 0 0 20px rgba(88, 196, 240, 0.08);
  position: relative;
  overflow: hidden;
}
.theme-preview--neon::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 3px,
    rgba(88, 196, 240, 0.04) 3px,
    rgba(88, 196, 240, 0.04) 4px
  );
}
.theme-preview--midnight {
  background: linear-gradient(145deg, #122658, #04081e);
  border: 1.5px solid #3d7dff;
}

/* Mini grid inside preview */
.tp-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  width: 100%;
  height: 100%;
  border: 1.5px solid;
  position: relative;
  z-index: 1;
}

/* Warm mini cells */
.theme-preview--warm .tp-grid {
  border-color: #241a08;
  border-radius: 2px;
  overflow: hidden;
}
.theme-preview--warm .tp-cell {
  background: #fffdf6;
  border-right: 1px solid #e4cf9e;
  border-bottom: 1px solid #e4cf9e;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(7px, 2vw, 11px);
  font-weight: 600;
  color: #1d4ed8;
  aspect-ratio: 1;
}
.theme-preview--warm .tp-cell.tp-given {
  background: rgba(36, 26, 8, 0.06);
  color: #241a08;
}
.theme-preview--warm .tp-cell.tp-sel {
  background: rgba(217, 72, 15, 0.16);
  color: #d9480f;
}
.theme-preview--warm .tp-cell.tp-br {
  border-right: 2px solid #96794a;
}
.theme-preview--warm .tp-cell.tp-bb {
  border-bottom: 2px solid #96794a;
}

/* Jungle mini cells */
.theme-preview--jungle .tp-grid {
  border-color: #22c878;
  border-radius: 1px;
  overflow: hidden;
}
.theme-preview--jungle .tp-cell {
  background: #082e1c;
  border-right: 1px solid #1a5236;
  border-bottom: 1px solid #1a5236;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(7px, 2vw, 11px);
  font-weight: 600;
  color: #2bbf8e;
  aspect-ratio: 1;
}
.theme-preview--jungle .tp-cell.tp-given {
  background: rgba(234, 251, 240, 0.06);
  color: #eafbf0;
}
.theme-preview--jungle .tp-cell.tp-sel {
  background: rgba(34, 200, 120, 0.22);
  color: #22c878;
}
.theme-preview--jungle .tp-cell.tp-br {
  border-right: 2px solid #1c6b42;
}
.theme-preview--jungle .tp-cell.tp-bb {
  border-bottom: 2px solid #1c6b42;
}

/* Neon mini cells */
.theme-preview--neon .tp-grid {
  border-color: #f4f4f4;
  border-radius: 0;
  overflow: hidden;
}
.theme-preview--neon .tp-cell {
  background: #101010;
  border-right: 1px solid #303030;
  border-bottom: 1px solid #303030;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(7px, 2vw, 11px);
  font-weight: 600;
  color: #58c4f0;
  aspect-ratio: 1;
}
.theme-preview--neon .tp-cell.tp-given {
  background: rgba(244, 244, 244, 0.05);
  color: #f4f4f4;
}
.theme-preview--neon .tp-cell.tp-sel {
  background: rgba(88, 196, 240, 0.22);
  color: #58c4f0;
}
.theme-preview--neon .tp-cell.tp-br {
  border-right: 2px solid #4a4a4a;
}
.theme-preview--neon .tp-cell.tp-bb {
  border-bottom: 2px solid #4a4a4a;
}

/* Midnight mini cells */
.theme-preview--midnight .tp-grid {
  border-color: #3d7dff;
  border-radius: 2px;
  overflow: hidden;
}
.theme-preview--midnight .tp-cell {
  background: #0a1a40;
  border-right: 1px solid #1c2c54;
  border-bottom: 1px solid #1c2c54;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(7px, 2vw, 11px);
  font-weight: 600;
  color: #7aa6ff;
  aspect-ratio: 1;
}
.theme-preview--midnight .tp-cell.tp-given {
  background: rgba(238, 242, 255, 0.06);
  color: #eef2ff;
}
.theme-preview--midnight .tp-cell.tp-sel {
  background: rgba(61, 125, 255, 0.24);
  color: #3d7dff;
}
.theme-preview--midnight .tp-cell.tp-br {
  border-right: 2px solid #2e4680;
}
.theme-preview--midnight .tp-cell.tp-bb {
  border-bottom: 2px solid #2e4680;
}

.theme-new-icon {
  width: 11px;
  height: 11px;
  vertical-align: middle;
  color: var(--accent);
  display: inline-block;
  margin: 0 1px;
}

/* ════════════════════════════════════════════════
   PREPARING SCREEN
════════════════════════════════════════════════ */
#s-preparing {
  gap: 0;
}

.prep-spinner {
  width: clamp(52px, 13vw, 68px);
  height: clamp(52px, 13vw, 68px);
  margin-bottom: 22px;
  animation: spinCW 1.1s linear infinite;
}
.prep-spinner svg {
  width: 100%;
  height: 100%;
}

@keyframes spinCW {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.prep-title {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(1.5rem, 5.5vw, 2.2rem);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.4em;
}
.prep-sub {
  font-size: 0.65rem;
  letter-spacing: 0.35em;
  color: var(--ink-dim);
  text-transform: uppercase;
  margin-bottom: clamp(24px, 5vh, 36px);
}
.prep-dots {
  display: flex;
  gap: 8px;
}
.prep-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink-faint);
  animation: prepDot 1.2s ease-in-out infinite;
}
.prep-dot:nth-child(2) {
  animation-delay: 0.2s;
}
.prep-dot:nth-child(3) {
  animation-delay: 0.4s;
}
@keyframes prepDot {
  0%,
  80%,
  100% {
    background: var(--ink-faint);
    transform: scale(1);
  }
  40% {
    background: var(--accent);
    transform: scale(1.4);
  }
}

/* ════════════════════════════════════════════════
   GAME SCREEN
════════════════════════════════════════════════ */
#s-game {
  justify-content: flex-start;
  padding: 0;
  gap: 0;
  overflow-y: auto;
  align-items: stretch;
}

/* Full-width game topbar — mirrors .page-header style */
.game-page-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: clamp(14px, 3vw, 22px) clamp(18px, 5vw, 36px)
    clamp(12px, 2.5vw, 18px);
  border-bottom: 1px solid var(--paper3);
  flex-shrink: 0;
  background: var(--card-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.game-header-left {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

/* Main game body: board centered, sidebars flanking it in a flex row */
.game-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(12px, 2.5vw, 20px) clamp(12px, 3vw, 24px);
  gap: 0;
  position: relative;
  width: 100%;
  margin: 0 auto;
}
.game-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(8px, 1.5vw, 14px);
  flex: 0 0 auto;
  min-width: 0;
  width: auto;
}

/* Controls bar above board */
.game-above-board {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  width: 100%;
  padding: 0 2px;
  flex-wrap: wrap;
}

/* Left sidebar — vertical column of action buttons */
.game-action-sidebar {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  flex-shrink: 0;
  width: auto;
  padding-right: 12px;
}
.game-act-btn {
  width: clamp(48px, 6vw, 64px);
  height: clamp(48px, 6vw, 64px);
  border-radius: 50%;
  background: var(--card-bg);
  border: 1.5px solid var(--ink-faint);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  transition:
    border-color 0.2s,
    color 0.2s,
    transform 0.15s,
    box-shadow 0.2s;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
  color: var(--ink-mid);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.game-act-btn svg {
  width: 38%;
  height: 38%;
  fill: currentColor;
  display: block;
  flex-shrink: 0;
}
.game-act-btn span {
  font-family: "DM Sans", sans-serif;
  font-size: 0.42rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: inherit;
  line-height: 1;
}
.game-act-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}
.game-act-btn.primary {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-bg);
}
.game-act-btn.primary:hover {
  background: var(--accent);
  color: var(--btn-primary-color);
}
.game-act-btn.danger:hover {
  border-color: var(--error-txt);
  color: var(--error-txt);
}
body[data-theme="neon"] .game-act-btn {
  border-radius: 0;
}
body[data-theme="neon"] .game-act-btn:hover {
  box-shadow: 0 0 16px rgba(88, 196, 240, 0.3);
}

/* ── Responsive breakpoints ──────────────────────────────────── */

/* Medium screens: shrink side panels and tighten gaps so nothing
   overlaps the board before it has to wrap */
@media (max-width: 1100px) {
  .game-body {
    gap: 0;
  }
  .game-act-btn {
    width: clamp(40px, 5.5vw, 56px);
    height: clamp(40px, 5.5vw, 56px);
  }
  .game-act-btn span {
    font-size: 0.36rem;
  }
  .num-btn {
    width: clamp(38px, 6vw, 60px);
    height: clamp(38px, 6vw, 60px);
  }
}

/* Tablet / narrow: stack sidebar below board */
@media (max-width: 960px) {
  .game-body {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: clamp(10px, 3vw, 20px) clamp(8px, 3vw, 16px);
    gap: clamp(8px, 2vw, 14px);
  }
  .game-action-sidebar {
    order: 2;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    width: 100%;
    padding-right: 0;
  }
  .game-center {
    order: 1;
    width: 100%;
    max-width: 100%;
    flex: 0 0 auto;
    align-items: center;
  }
  .game-above-board {
    justify-content: center;
    width: 100%;
  }
  .grid-wrap {
    margin: 0 auto;
  }
  .game-numpad-panel {
    width: 100%;
    align-items: center;
  }
  .numpad {
    width: 100%;
    justify-content: center;
  }
  .num-btn {
    flex: 1 1 0;
    height: auto;
    aspect-ratio: 1;
    min-width: 0;
    max-width: 52px;
  }
  .game-act-btn {
    width: clamp(48px, 13vw, 60px);
    height: clamp(48px, 13vw, 60px);
  }
  .game-act-btn span {
    font-size: 0.42rem;
  }
}

/* Tablet portrait: additional tightening */
@media (max-width: 768px) {
  .grid-wrap {
    width: min(380px, 88vw);
    max-width: 380px;
    padding: 8px;
  }
  .game-page-header {
    padding: clamp(10px, 2.5vw, 16px) clamp(12px, 3vw, 20px);
  }
  .top-title {
    font-size: clamp(1.1rem, 4vw, 1.5rem);
  }
  .diff-grid {
    max-width: 320px;
  }
  .btn-begin {
    max-width: 320px;
  }
  .popup-card {
    max-width: 300px;
  }
  .popup-brand {
    font-size: clamp(2.2rem, 8vw, 3.2rem);
  }
  .lb-tabs,
  .lb-list {
    max-width: 360px;
  }
  .lobby-bottom {
    max-width: 340px;
  }
  .lobby-stat-val {
    font-size: clamp(1.1rem, 4vw, 1.5rem);
  }
}

/* Small mobile: tighten everything further */
@media (max-width: 480px) {
  .game-act-btn {
    width: clamp(40px, 13vw, 50px);
    height: clamp(40px, 13vw, 50px);
    gap: 2px;
  }
  .game-act-btn span {
    font-size: 0.36rem;
  }
  .game-act-btn svg {
    width: 34%;
    height: 34%;
  }
  .num-btn {
    font-size: clamp(0.9rem, 4vw, 1.2rem);
  }
  .toggle-lbl {
    font-size: 0.56rem;
  }
}

.top-title {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 600;
  color: var(--ink);
  line-height: 1;
}
.top-title-dot {
  color: var(--accent);
}
.top-diff-badge {
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-bg);
  padding: 0.3em 0.75em;
  border-radius: 20px;
  border: 1px solid var(--accent-bg);
  display: inline-block;
  align-self: flex-start;
  margin-top: 3px;
}
/* Neon badge */
body[data-theme="neon"] .top-diff-badge {
  border-radius: 0;
  border-color: rgba(88, 196, 240, 0.5);
  box-shadow: 0 0 8px rgba(88, 196, 240, 0.2);
}
.top-stats {
  display: flex;
  gap: 16px;
  align-items: center;
}
.stat-item {
  text-align: right;
}
.stat-val {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1;
}
.stat-lbl {
  font-size: 0.52rem;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
  text-transform: uppercase;
}

/* Grid wrap — theme-specific backgrounds */
.grid-wrap {
  width: min(440px, 88vw);
  max-width: 440px;
  margin-bottom: clamp(10px, 2vw, 18px);
  padding: 10px;
  background: var(--grid-wrap-bg);
  border-radius: 8px;
  box-shadow: var(--grid-wrap-shadow);
  box-sizing: border-box;
}

/* Warm: subtle parchment frame */
body[data-theme="warm"] .grid-wrap {
  border: 1px solid var(--grid-wrap-border);
}

/* Jungle: dense forest floor, leafy border */
body[data-theme="jungle"] .grid-wrap {
  border: 1px solid var(--grid-wrap-border);
  position: relative;
  overflow: hidden;
}
body[data-theme="jungle"] .grid-wrap::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(
      ellipse at 10% 20%,
      rgba(34, 200, 120, 0.08) 0%,
      transparent 40%
    ),
    radial-gradient(
      ellipse at 90% 80%,
      rgba(43, 191, 142, 0.06) 0%,
      transparent 40%
    );
  pointer-events: none;
  z-index: 0;
}
body[data-theme="jungle"] #equation-grid {
  position: relative;
  z-index: 1;
}

/* Neon: electric grid frame */
body[data-theme="neon"] .grid-wrap {
  padding: 12px;
  border-radius: 0;
}

/* Midnight: deep space */
body[data-theme="midnight"] .grid-wrap {
  border-radius: 8px;
}

#equation-grid {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  border: 2.5px solid var(--box-border);
  border-radius: 3px;
  overflow: hidden;
  background: var(--grid-bg);
  box-shadow: var(--shadow);
  width: 100%;
  aspect-ratio: 1;
}

/* Neon grid — sharp corners, glowing border */
body[data-theme="neon"] #equation-grid {
  border-radius: 0;
  border-width: 2px;
  box-shadow:
    0 0 0 1px rgba(88, 196, 240, 0.4),
    0 0 30px rgba(88, 196, 240, 0.2);
}

.cell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: var(--cell-bg);
  border-right: 1px solid var(--grid-thin);
  border-bottom: 1px solid var(--grid-thin);
  transition: background 0.1s;
  aspect-ratio: 1;
}

/* Neon cells get scanline inset */
body[data-theme="neon"] .cell {
  background: #0c0c18;
}
body[data-theme="neon"] .cell:nth-child(odd) {
  background: #0e0e1c;
}

/* Jungle cells — very slightly varied */
body[data-theme="jungle"] .cell {
  background: #0f2412;
}
body[data-theme="jungle"] .cell:nth-child(even) {
  background: #0d2010;
}

/* ── OVERLAY SVG — shared full-grid layer for Consecutive Sudoku dots
   and Arrow Sum Sudoku arrows. Coordinate space is 0-900 (100 units per
   cell) so it never needs recalculating on resize. ────────────────── */
#equation-grid {
  position: relative;
}
.overlay-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 5;
}
.consec-dot {
  fill: var(--ink);
  stroke: var(--card-bg, #fff);
  stroke-width: 3;
}
.arrow-line {
  fill: none;
  stroke: var(--ink-mid);
  stroke-width: 4.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.62;
}
.arrow-circle {
  fill: none;
  stroke: var(--ink-mid);
  stroke-width: 4.5;
  opacity: 0.62;
}
.arrow-head {
  fill: var(--ink-mid);
  opacity: 0.62;
}

/* Cage borders — replace the classic 3x3-box lines with irregular
   equation-cage boundaries computed in JS (cage-edge-*) */
.cell.cage-edge-top {
  border-top: 2px solid var(--grid-thick);
}
.cell.cage-edge-right {
  border-right: 2px solid var(--grid-thick);
}
.cell.cage-edge-bottom {
  border-bottom: 2px solid var(--grid-thick);
}
.cell.cage-edge-left {
  border-left: 2px solid var(--grid-thick);
}
.cell:nth-child(9n) {
  border-right: none;
}
.cell:nth-child(n + 73) {
  border-bottom: none;
}
.cell.given {
  background: var(--given-bg);
}

/* Theme-specific given cells */
body[data-theme="warm"] .cell.given {
  background: rgba(42, 37, 32, 0.05);
}
body[data-theme="jungle"] .cell.given {
  background: rgba(34, 200, 120, 0.07);
}
body[data-theme="neon"] .cell.given {
  background: rgba(88, 196, 240, 0.06);
}
body[data-theme="midnight"] .cell.given {
  background: rgba(61, 125, 255, 0.06);
}

.cell.selected {
  background: rgba(217, 72, 15, 0.16) !important;
}
body[data-theme="jungle"] .cell.selected {
  background: rgba(34, 200, 120, 0.22) !important;
}
body[data-theme="neon"] .cell.selected {
  background: rgba(88, 196, 240, 0.28) !important;
}
body[data-theme="midnight"] .cell.selected {
  background: rgba(61, 125, 255, 0.28) !important;
}

.cell.row-hl {
  background: var(--row-hl);
}
.cell.same-num {
  background: var(--same-hl) !important;
}
.cell.error {
  background: var(--error-bg);
}

/* Neon cage borders glow */
body[data-theme="neon"] .cell.cage-edge-top {
  border-top: 2px solid rgba(88, 196, 240, 0.6);
}
body[data-theme="neon"] .cell.cage-edge-right {
  border-right: 2px solid rgba(88, 196, 240, 0.6);
}
body[data-theme="neon"] .cell.cage-edge-bottom {
  border-bottom: 2px solid rgba(88, 196, 240, 0.6);
}
body[data-theme="neon"] .cell.cage-edge-left {
  border-left: 2px solid rgba(88, 196, 240, 0.6);
}

/* Jungle cage borders glow */
body[data-theme="jungle"] .cell.cage-edge-top {
  border-top: 2px solid rgba(34, 200, 120, 0.5);
}
body[data-theme="jungle"] .cell.cage-edge-right {
  border-right: 2px solid rgba(34, 200, 120, 0.5);
}
body[data-theme="jungle"] .cell.cage-edge-bottom {
  border-bottom: 2px solid rgba(34, 200, 120, 0.5);
}
body[data-theme="jungle"] .cell.cage-edge-left {
  border-left: 2px solid rgba(34, 200, 120, 0.5);
}

/* Equation clue label — sits in the top-left corner of a cage's anchor cell */
.cage-clue {
  position: absolute;
  top: 2px;
  left: 3px;
  font-family: "Crimson Pro", Georgia, serif;
  font-weight: 700;
  color: var(--grid-thick);
  line-height: 1;
  pointer-events: none;
  user-select: none;
  z-index: 2;
  letter-spacing: 0.2px;
}
body[data-theme="neon"] .cage-clue {
  color: #58c4f0;
  text-shadow: 0 0 6px rgba(88, 196, 240, 0.5);
}
body[data-theme="jungle"] .cage-clue {
  color: #22c878;
  text-shadow: 0 0 6px rgba(34, 200, 120, 0.4);
}
body[data-theme="midnight"] .cage-clue {
  color: #9a8de0;
}

.cell-num {
  font-family: "Crimson Pro", Georgia, serif;
  font-weight: 600;
  color: var(--ink);
  line-height: 1;
  pointer-events: none;
  user-select: none;
}
.cell.given .cell-num {
  color: var(--ink);
}
.cell:not(.given) .cell-num {
  color: var(--blue);
}
.cell.error .cell-num {
  color: var(--error-txt);
}

/* Jungle user numbers */
body[data-theme="jungle"] .cell:not(.given) .cell-num {
  color: #22c878;
  text-shadow: 0 0 8px rgba(34, 200, 120, 0.4);
}

/* Neon given numbers — pink; user numbers — cyan */
body[data-theme="neon"] .cell.given .cell-num {
  color: #f0f0ff;
}
body[data-theme="neon"] .cell:not(.given) .cell-num {
  color: #58c4f0;
  text-shadow: 0 0 8px rgba(88, 196, 240, 0.5);
}

/* Midnight user numbers */
body[data-theme="midnight"] .cell:not(.given) .cell-num {
  color: #6a90e8;
}

.pencil-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  width: 90%;
  height: 90%;
  pointer-events: none;
}
.pencil-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "DM Sans", sans-serif;
  color: var(--ink-mid);
  line-height: 1;
}

/* ── Numpad panel — below the board, horizontal row ── */
.game-numpad-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  align-items: center;
}

.numpad {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  gap: clamp(4px, 0.8vw, 8px);
  justify-content: center;
  width: 100%;
}
.num-btn {
  width: clamp(36px, 5vw, 52px);
  height: clamp(36px, 5vw, 52px);
  border: 1.5px solid var(--ink-faint);
  border-radius: 12px;
  background: var(--card-bg);
  color: var(--ink);
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(0.9rem, 1.8vw, 1.2rem);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  user-select: none;
}
.num-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-bg);
  transform: scale(1.05);
}
.num-btn:active {
  transform: scale(0.95);
}
.num-btn.erase-btn {
  font-size: clamp(0.9rem, 2vw, 1.2rem);
  color: var(--ink-mid);
  font-family: "DM Sans", sans-serif;
}
.num-btn.pencil-btn {
  font-size: clamp(0.85rem, 1.8vw, 1.1rem);
  font-family: "DM Sans", sans-serif;
  color: var(--ink-mid);
}
.num-btn.pencil-btn.active {
  border-color: var(--blue);
  background: var(--blue-lt);
  color: var(--blue);
}
.num-btn.complete {
  opacity: 0.25;
  pointer-events: none;
}

/* Neon numpad */
body[data-theme="neon"] .num-btn {
  border-radius: 0;
}
body[data-theme="neon"] .num-btn:hover {
  box-shadow: 0 0 10px rgba(88, 196, 240, 0.3);
}

/* Info row below numpad panel */
.numpad-info-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 8px 2px 0;
  border-top: 1px solid var(--paper3);
}

.toggle-row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}
.toggle-item {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  user-select: none;
}
.toggle-box {
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--ink-faint);
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  font-size: 0.7rem;
  color: white;
}
.toggle-item.on .toggle-box {
  background: var(--accent);
  border-color: var(--accent);
}
.toggle-lbl {
  font-size: 0.62rem;
  color: var(--ink-mid);
  letter-spacing: 0.08em;
}

.hint-bar {
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 0.62rem;
  color: var(--ink-mid);
}
.mistake-dots {
  display: flex;
  gap: 4px;
}
.mistake-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-faint);
  transition: background 0.3s;
}
.mistake-dot.used {
  background: var(--error-txt);
}
.mistake-overflow {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--error-txt);
  line-height: 1;
  margin-left: 1px;
}

/* ════════════════════════════════════════════════
   COMPLETE SCREEN
════════════════════════════════════════════════ */
#s-complete {
  gap: 0;
}

.complete-star {
  width: clamp(48px, 12vw, 64px);
  height: clamp(48px, 12vw, 64px);
  margin-bottom: 14px;
  animation: popIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}
.complete-star svg {
  width: 100%;
  height: 100%;
  fill: var(--accent);
}
body[data-theme="neon"] .complete-star svg {
  filter: drop-shadow(0 0 12px var(--accent));
}
body[data-theme="jungle"] .complete-star svg {
  filter: drop-shadow(0 0 10px rgba(34, 200, 120, 0.5));
}

@keyframes popIn {
  from {
    transform: scale(0);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.complete-title {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(2.2rem, 7vw, 3.4rem);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.2em;
  text-align: center;
}
.complete-sub {
  font-size: 0.7rem;
  letter-spacing: 0.35em;
  color: var(--ink-dim);
  text-transform: uppercase;
  margin-bottom: clamp(20px, 4vh, 36px);
}
.complete-stats {
  display: flex;
  gap: 28px;
  margin-bottom: clamp(24px, 4vh, 40px);
}
.cstat {
  text-align: center;
}
.cstat-val {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(1.8rem, 6vw, 2.8rem);
  font-weight: 600;
  color: var(--accent);
  line-height: 1;
}
.cstat-lbl {
  font-size: 0.55rem;
  letter-spacing: 0.3em;
  color: var(--ink-dim);
  text-transform: uppercase;
  margin-top: 3px;
}
.complete-btns {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}
.btn-comp {
  padding: 0.75em 2em;
  border-radius: var(--radius);
  font-family: "DM Sans", sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  cursor: pointer;
  text-transform: uppercase;
  transition: all 0.2s;
}
.btn-comp.filled {
  background: rgba(255, 255, 255, 0.92);
  border: none;
  color: var(--ink);
}
.btn-comp.filled:hover {
  background: var(--accent);
  color: var(--btn-primary-color);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.22);
}
.btn-comp.outline {
  background: transparent;
  border: 1.5px solid var(--ink-faint);
  color: var(--ink-mid);
}
.btn-comp.outline:hover {
  border-color: var(--ink);
  color: var(--ink);
}

/* ════════════════════════════════════════════════
   PAGE CHROME (settings & info)
════════════════════════════════════════════════ */
.page-header {
  width: 100%;
  max-width: 460px;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: clamp(18px, 4vw, 30px) clamp(18px, 5vw, 32px) clamp(16px, 3vw, 22px);
  border-bottom: 1px solid var(--paper3);
  flex-shrink: 0;
  align-self: center;
}
.page-back-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1.5px solid var(--ink-mid);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-mid);
  transition: all 0.18s;
  flex-shrink: 0;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.page-back-btn:hover {
  border-color: var(--ink);
  color: var(--ink);
  background: var(--accent-bg);
}
.page-back-btn svg {
  width: 15px;
  height: 15px;
  fill: currentColor;
}
.page-title {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(1.5rem, 5.5vw, 2rem);
  font-weight: 600;
  color: var(--ink);
}

/* ════════════════════════════════════════════════
   SETTINGS PAGE
════════════════════════════════════════════════ */
#s-settings {
  justify-content: flex-start;
  align-items: stretch;
  padding: 0;
  overflow-y: auto;
}

#s-settings .page-header {
  align-self: center;
  flex-shrink: 0;
}

#s-settings .page-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 7px;
  align-self: center;
  width: 100%;
  max-width: 460px;
  padding: clamp(14px, 3vw, 24px) clamp(18px, 5vw, 32px);
}

.settings-section-label {
  font-size: 0.58rem;
  letter-spacing: 0.35em;
  color: var(--ink-dim);
  text-transform: uppercase;
  margin: 14px 0 4px;
  padding-left: 2px;
}
.settings-section-label:first-child {
  margin-top: 0;
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 16px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  gap: 12px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.settings-row--about {
  align-items: flex-start;
}
.settings-row-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
}
.settings-row-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  fill: var(--ink-dim);
}
.settings-row-info {
  flex: 1;
  min-width: 0;
}
.settings-row-label {
  font-size: 0.82rem;
  color: var(--ink);
  font-weight: 500;
  margin-bottom: 1px;
}
.settings-row-desc {
  font-size: 0.62rem;
  color: var(--ink-dim);
  letter-spacing: 0.01em;
}

/* Toggle switch */
.sw {
  position: relative;
  width: 42px;
  height: 24px;
  flex-shrink: 0;
}
.sw input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}
.sw-track {
  position: absolute;
  inset: 0;
  background: var(--ink-faint);
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.2s;
}
.sw-track::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: white;
  transition: transform 0.2s;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}
.sw input:checked + .sw-track {
  background: var(--accent);
}
.sw input:checked + .sw-track::after {
  transform: translateX(18px);
}

/* ════════════════════════════════════════════════
   INFO PAGE
════════════════════════════════════════════════ */
#s-info {
  justify-content: flex-start;
  align-items: stretch;
  padding: 0;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}
#s-info .page-header,
#popup-stats .page-header {
  max-width: clamp(480px, 92vw, 800px);
}

#s-info .page-header {
  align-self: center;
  flex-shrink: 0;
  padding-top: clamp(12px, 2.5vw, 18px);
  padding-bottom: clamp(10px, 2vw, 16px);
  border-bottom: none;
}

/* Reuses the popup-card divider look right under the title */
.info-rule-line {
  width: 100%;
  max-width: 200px;
  height: 1px;
  background: var(--card-border);
  align-self: center;
  margin: 0 auto clamp(10px, 2vh, 18px);
  flex-shrink: 0;
}

.info-body {
  flex: 1;
  width: 100%;
  max-width: clamp(480px, 92vw, 800px);
  padding: clamp(10px, 2.5vw, 18px) clamp(18px, 5vw, 32px)
    clamp(24px, 4vh, 32px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  align-self: center;
}

.info-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 12px 14px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 3px 14px rgba(0, 0, 0, 0.08);
}
.info-card-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  background: var(--accent-bg);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.info-card-icon svg {
  width: 16px;
  height: 16px;
  fill: var(--accent);
}
.info-card-body {
  flex: 1;
  min-width: 0;
}
.info-card-title {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 3px;
}
.info-card-text {
  font-size: 0.72rem;
  color: var(--ink-mid);
  line-height: 1.55;
}

.info-three-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 7px;
}
.info-mini-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 10px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  text-align: center;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 3px 14px rgba(0, 0, 0, 0.08);
}
.info-mini-card svg {
  width: 18px;
  height: 18px;
  fill: var(--accent);
}
.info-mini-card strong {
  font-size: 0.72rem;
  color: var(--ink);
  font-weight: 600;
  font-family: "Crimson Pro", Georgia, serif;
}
.info-mini-card span {
  font-size: 0.6rem;
  color: var(--ink-dim);
}

.info-shortcuts-grid {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 10px 14px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 3px 14px rgba(0, 0, 0, 0.08);
}
.info-close-btn {
  margin-top: 6px;
}
.info-sc-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.7rem;
  color: var(--ink-mid);
}

#popup-stats {
  justify-content: flex-start;
  align-items: stretch;
  padding: 0;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}

/* ── "Your Stats" popup — reuses the info-card look instead of the
   borderless dashboard-strip style (that style only reads correctly
   inside the lobby's own dashboard card). ── */
#popup-stats .lobby-xp-bar {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 12px 14px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 3px 14px rgba(0, 0, 0, 0.08);
}
#popup-stats .lobby-stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 7px;
}
#popup-stats .lobby-stat {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-right: none;
  border-radius: 14px;
  padding: 10px 8px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 3px 14px rgba(0, 0, 0, 0.08);
}
#popup-stats .lobby-badges {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: none;
}
#popup-stats .lb-more-entry {
  width: 100%;
  font: inherit;
  text-align: left;
  cursor: pointer;
  color: var(--ink-mid);
}
#popup-stats .lb-more-entry .lb-rank {
  color: var(--accent);
}
#popup-stats .lb-more-entry .lb-time {
  color: var(--ink-mid);
  font-family: "DM Sans", sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
}
#popup-stats .lb-more-entry:hover {
  border-color: var(--accent);
}
#popup-stats .settings-section-label {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none;
  color: var(--ink);
}

/* ── Themed scrollbar for the scrollable pages — matches each theme's
   accent color instead of the browser's default gray bar. ── */
#s-info,
#popup-stats {
  scrollbar-width: thin;
  scrollbar-color: var(--accent) transparent;
}
#s-info::-webkit-scrollbar,
#popup-stats::-webkit-scrollbar {
  width: 8px;
}
#s-info::-webkit-scrollbar-track,
#popup-stats::-webkit-scrollbar-track {
  background: transparent;
}
#s-info::-webkit-scrollbar-thumb,
#popup-stats::-webkit-scrollbar-thumb {
  background-color: var(--accent);
  border-radius: 8px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
#s-info::-webkit-scrollbar-thumb:hover,
#popup-stats::-webkit-scrollbar-thumb:hover {
  background-color: var(--accent-lt);
}

/* Cartoonic Mode — chunkier, squared-off sticker scrollbar */
body.cartoonic-mode #s-info,
body.cartoonic-mode #popup-stats {
  scrollbar-color: var(--accent) var(--card-bg);
}
body.cartoonic-mode #s-info::-webkit-scrollbar,
body.cartoonic-mode #popup-stats::-webkit-scrollbar {
  width: 11px;
}
body.cartoonic-mode #s-info::-webkit-scrollbar-track,
body.cartoonic-mode #popup-stats::-webkit-scrollbar-track {
  background: var(--card-bg);
  border-radius: 6px;
}
body.cartoonic-mode #s-info::-webkit-scrollbar-thumb,
body.cartoonic-mode #popup-stats::-webkit-scrollbar-thumb {
  border-radius: 6px;
  border: 2px solid var(--box-border);
  background-clip: padding-box;
}
.kbd-inline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 20px;
  padding: 0 5px;
  background: var(--paper2);
  border: 1px solid var(--ink-faint);
  border-bottom-width: 2px;
  border-radius: 4px;
  font-size: 0.62rem;
  color: var(--ink);
  font-family: monospace;
  flex-shrink: 0;
  white-space: nowrap;
}

/* ════════════════════════════════════════════════
   TOAST
════════════════════════════════════════════════ */
#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--ink);
  color: var(--paper);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  padding: 0.65em 1.6em;
  border-radius: 20px;
  z-index: 100;
  transition:
    transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
    opacity 0.3s;
  opacity: 0;
  white-space: nowrap;
  pointer-events: none;
}
#toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}
#toast.success {
  background: var(--success);
  color: var(--paper);
}
#toast.error {
  background: var(--error-txt);
}

body[data-theme="neon"] #toast {
  border-radius: 0;
}
body[data-theme="jungle"] #toast.success {
  color: #0a1a0c;
}

/* ════════════════════════════════════════════════
   ANIMATIONS
════════════════════════════════════════════════ */
@keyframes cellPop {
  0% {
    transform: scale(1);
  }
  40% {
    transform: scale(1.18);
  }
  100% {
    transform: scale(1);
  }
}
.cell-pop {
  animation: cellPop 0.15s ease;
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  20% {
    transform: translateX(-4px);
  }
  40% {
    transform: translateX(4px);
  }
  60% {
    transform: translateX(-3px);
  }
  80% {
    transform: translateX(3px);
  }
}
.shake {
  animation: shake 0.3s ease;
}

@keyframes cellWin {
  0% {
    background: var(--cell-bg);
  }
  50% {
    background: var(--accent-bg);
  }
  100% {
    background: rgba(40, 120, 64, 0.1);
  }
}
.cell-win {
  animation: cellWin 0.6s ease forwards;
}

/* ════════════════════════════════════════════════
   IN-GAME POPUP SCREENS
   (Resume, New Game, Quit — full-screen lobby style)
════════════════════════════════════════════════ */

/* Overlay backdrop behind popup screen — solid lobby-style page */
.popup-screen {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  /* Solid background matching the lobby: theme's fixed image + overlay */
  background-image: var(--bg-image);
  background-size: cover;
  background-position: center;
  transition:
    opacity 0.32s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.32s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Theme overlay on top of the bg image — mirrors body::before */
.popup-screen::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--bg-overlay);
  transition: background 0.4s;
  pointer-events: none;
}
/* Obsidian Night scanlines on popup */
body[data-theme="neon"] .popup-screen {
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(88, 196, 240, 0.025) 2px,
      rgba(88, 196, 240, 0.025) 4px
    ),
    var(--bg-image);
  background-size: auto, cover;
  background-position: auto, center;
}
/* Ensure card sits above the pseudo-element overlay */
.popup-screen .popup-card {
  position: relative;
  z-index: 1;
}
.popup-screen.out {
  opacity: 0;
  pointer-events: none;
  transform: scale(1.02);
}

/* Central card — lobby style panel */
.popup-card {
  width: 100%;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  animation: popupSlideIn 0.28s cubic-bezier(0.34, 1.4, 0.64, 1) both;
}
@keyframes popupSlideIn {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* Popup brand title */
.popup-brand {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(2.8rem, 9vw, 4.2rem);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
  line-height: 1.05;
  margin-bottom: clamp(8px, 1.5vh, 14px);
  text-align: center;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.2);
}
.popup-brand-dot {
  color: var(--accent);
}

/* Apply same glow overrides as main brand */
body[data-theme="jungle"] .popup-brand {
  text-shadow:
    0 0 30px rgba(34, 200, 120, 0.5),
    0 2px 16px rgba(0, 0, 0, 0.6);
}
body[data-theme="neon"] .popup-brand {
  text-shadow:
    0 0 20px rgba(88, 196, 240, 0.8),
    0 0 60px rgba(88, 196, 240, 0.4);
}
body[data-theme="midnight"] .popup-brand {
  text-shadow:
    0 0 24px rgba(61, 125, 255, 0.6),
    0 2px 12px rgba(0, 0, 0, 0.5);
}

.popup-sub {
  font-size: clamp(0.62rem, 2vw, 0.78rem);
  letter-spacing: 0.48em;
  color: var(--ink-dim);
  text-transform: uppercase;
  margin-bottom: clamp(18px, 4vh, 30px);
  text-align: center;
}

.popup-rule-line {
  width: clamp(100px, 30vw, 180px);
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--grid-thick),
    transparent
  );
  margin: 0 auto clamp(20px, 4vh, 32px);
}
body[data-theme="neon"] .popup-rule-line {
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  box-shadow: 0 0 6px var(--accent);
}
body[data-theme="jungle"] .popup-rule-line {
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

/* Game info strip (time + moves) inside popups */
.popup-info-strip {
  display: flex;
  gap: 10px;
  width: 100%;
  margin-bottom: clamp(16px, 3vh, 26px);
}
.popup-info-cell {
  flex: 1;
  text-align: center;
  padding: 12px 8px 10px;
  background: var(--card-bg);
  border: 1px solid var(--ink-faint);
  border-radius: 12px;
  box-shadow: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}
body[data-theme="neon"] .popup-info-cell {
  border-radius: 0;
}
.popup-info-val {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(1.2rem, 4vw, 1.6rem);
  font-weight: 600;
  color: var(--accent);
  line-height: 1;
}
.popup-info-lbl {
  font-size: 0.48rem;
  letter-spacing: 0.25em;
  color: var(--ink-dim);
  text-transform: uppercase;
}

/* Popup action buttons — big primary + secondary */
.popup-btn-stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

.popup-btn-primary {
  width: 100%;
  padding: 1em 2em;
  background: rgba(255, 255, 255, 0.92);
  border: none;
  border-radius: var(--radius);
  color: var(--ink);
  font-family: "DM Sans", sans-serif;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  cursor: pointer;
  text-transform: uppercase;
  transition:
    background 0.2s,
    transform 0.15s,
    box-shadow 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.popup-btn-primary:hover {
  background: var(--accent);
  color: var(--btn-primary-color);
  transform: translateY(-1px);
}
.popup-btn-primary svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
  flex-shrink: 0;
}

.popup-btn-secondary {
  width: 100%;
  padding: 0.8em 2em;
  background: var(--card-bg);
  border: 1.5px solid var(--ink-faint);
  border-radius: var(--radius);
  color: var(--ink-mid);
  font-family: "DM Sans", sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  cursor: pointer;
  text-transform: uppercase;
  transition:
    border-color 0.2s,
    color 0.2s,
    transform 0.15s;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.popup-btn-secondary:hover {
  border-color: var(--ink);
  color: var(--ink);
  transform: translateY(-1px);
}
.popup-btn-secondary svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
  flex-shrink: 0;
}

.popup-btn-danger {
  width: 100%;
  padding: 0.8em 2em;
  background: transparent;
  border: 1.5px solid var(--ink-faint);
  border-radius: var(--radius);
  color: var(--ink-dim);
  font-family: "DM Sans", sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  cursor: pointer;
  text-transform: uppercase;
  transition:
    border-color 0.2s,
    color 0.2s,
    transform 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.popup-btn-danger:hover {
  border-color: var(--error-txt);
  color: var(--error-txt);
  transform: translateY(-1px);
}
.popup-btn-danger svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
  flex-shrink: 0;
}

/* Neon popup buttons */
body[data-theme="neon"] .popup-btn-primary,
body[data-theme="neon"] .popup-btn-secondary,
body[data-theme="neon"] .popup-btn-danger {
  border-radius: 0;
}
body[data-theme="neon"] .popup-btn-primary:hover {
  box-shadow: 0 0 20px rgba(88, 196, 240, 0.4);
}

/* Pause icon button (top bar) */
.btn-pause {
  width: clamp(32px, 8vw, 40px);
  height: clamp(32px, 8vw, 40px);
  border-radius: 50%;
  background: var(--card-bg);
  border: 1.5px solid var(--ink-faint);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-mid);
  transition:
    border-color 0.2s,
    color 0.2s,
    transform 0.15s;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  flex-shrink: 0;
}
.btn-pause:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: scale(1.08);
}
.btn-pause svg {
  width: 44%;
  height: 44%;
  fill: currentColor;
}
body[data-theme="neon"] .btn-pause {
  border-radius: 0;
}

/* ════════════════════════════════════════════════
   CONFIRM DIALOG (legacy, kept for safety)
════════════════════════════════════════════════ */
#confirm-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.55);
  align-items: center;
  justify-content: center;
}
.confirm-box {
  background: var(--paper);
  border: 1px solid var(--grid-thick);
  border-radius: 10px;
  padding: 28px 24px 22px;
  width: min(300px, 86vw);
  text-align: center;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
  animation: confirmSlide 0.2s ease both;
}
@keyframes confirmSlide {
  from {
    opacity: 0;
    transform: scale(0.93) translateY(10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}
.confirm-icon {
  font-size: 2rem;
  margin-bottom: 8px;
}
.confirm-title {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}
.confirm-msg {
  font-size: 0.72rem;
  color: var(--ink-mid);
  line-height: 1.6;
  margin-bottom: 22px;
}
.confirm-btns {
  display: flex;
  gap: 10px;
  justify-content: center;
}
.confirm-cancel {
  flex: 1;
  max-width: 110px;
  padding: 0.6em 1em;
  background: transparent;
  border: 1.5px solid var(--ink-faint);
  border-radius: 6px;
  color: var(--ink-mid);
  font-family: "DM Sans", sans-serif;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  text-transform: uppercase;
  transition: all 0.18s;
}
.confirm-cancel:hover {
  border-color: var(--ink);
  color: var(--ink);
}
.confirm-ok {
  flex: 1;
  max-width: 110px;
  padding: 0.6em 1em;
  background: rgba(255, 255, 255, 0.92);
  border: none;
  border-radius: 6px;
  color: var(--ink);
  font-family: "DM Sans", sans-serif;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  text-transform: uppercase;
  transition: all 0.18s;
}
.confirm-ok:hover {
  background: var(--accent);
  color: var(--btn-primary-color);
}

/* ════════════════════════════════════════════════
   BROWSER NOT SUPPORTED SCREEN
   Reuses loader screen structure
════════════════════════════════════════════════ */
#s-nosupport {
  display: none; /* shown via JS only when needed */
  position: fixed;
  inset: 0;
  z-index: 200;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  text-align: center;
}

#s-nosupport.visible {
  display: flex;
}

.nosupport-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 24px;
  color: var(--accent);
  opacity: 0.85;
}
.nosupport-icon svg {
  width: 100%;
  height: 100%;
  fill: currentColor;
}

.nosupport-title {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: clamp(1.4rem, 5vw, 2rem);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.nosupport-msg {
  font-size: clamp(0.7rem, 2.2vw, 0.85rem);
  color: var(--ink-mid);
  line-height: 1.7;
  max-width: 320px;
  margin-bottom: 28px;
}

.nosupport-browsers {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: center;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.nosupport-browser {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  opacity: 0.7;
}

.nosupport-browser-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--ink-faint);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

.nosupport-browser-name {
  font-size: 0.5rem;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
  text-transform: uppercase;
}

.nosupport-bar-wrap {
  width: clamp(140px, 45vw, 220px);
  height: 2px;
  background: var(--ink-faint);
  border-radius: 2px;
  overflow: hidden;
  opacity: 0.4;
}

/* ═══════════════════════════════════════════════════════════════
   CARTOONIC MODE — Settings → Appearance → Cartoonic Mode
   Adds chunky sticker-style borders + a playful heading font on
   top of whichever theme is active. Every color below is pulled
   from that theme's own CSS variables, so no theme color changes —
   only borders / shadows / font / radius.
═══════════════════════════════════════════════════════════════ */

/* Headings & logo — playful rounded font */
body.cartoonic-mode .brand,
body.cartoonic-mode .loading-brand,
body.cartoonic-mode .popup-brand {
  font-family: "Baloo 2", "Crimson Pro", Georgia, serif;
  font-weight: 700;
}
body.cartoonic-mode .page-title,
body.cartoonic-mode .popup-sub,
body.cartoonic-mode .brand-sub,
body.cartoonic-mode .loading-sub,
body.cartoonic-mode .lobby-mode-chip span,
body.cartoonic-mode .diff-name,
body.cartoonic-mode .lobby-xp-level,
body.cartoonic-mode .settings-row-label,
body.cartoonic-mode .info-card-title,
body.cartoonic-mode .hint-bar,
body.cartoonic-mode .toggle-lbl,
body.cartoonic-mode .diff-subheading,
body.cartoonic-mode .prep-sub {
  font-family: "Baloo 2", "DM Sans", sans-serif;
  font-weight: 600;
}

/* Preparing-puzzle screen + mode/difficulty card descriptions —
   pick up the cartoonic font too, same treatment as .diff-name */
body.cartoonic-mode .prep-title {
  font-family: "Baloo 2", "Crimson Pro", Georgia, serif;
  font-weight: 700;
}
body.cartoonic-mode .diff-desc {
  font-family: "Baloo 2", "DM Sans", sans-serif;
  font-weight: 500;
}

/* Chunky sticker borders on UI chrome. */
body.cartoonic-mode .icon-btn,
body.cartoonic-mode .btn-play-big,
body.cartoonic-mode .popup-btn-primary,
body.cartoonic-mode .popup-btn-secondary,
body.cartoonic-mode .popup-btn-danger,
body.cartoonic-mode .page-back-btn,
body.cartoonic-mode .lobby-mode-chip,
body.cartoonic-mode .diff-card,
body.cartoonic-mode .settings-row,
body.cartoonic-mode .info-card,
body.cartoonic-mode .info-mini-card,
body.cartoonic-mode .info-shortcuts-grid,
body.cartoonic-mode .lobby-stat,
body.cartoonic-mode .lobby-xp-bar {
  border: 3px solid var(--box-border) !important;
  box-shadow: 4px 4px 0 var(--box-border) !important;
}

body.cartoonic-mode .btn-play-big {
  border-width: 4px !important;
  box-shadow: 5px 5px 0 var(--box-border) !important;
}

/* Chunky press-down feel on tap */
body.cartoonic-mode .icon-btn:active,
body.cartoonic-mode .popup-btn-primary:active,
body.cartoonic-mode .popup-btn-secondary:active,
body.cartoonic-mode .popup-btn-danger:active,
body.cartoonic-mode .page-back-btn:active,
body.cartoonic-mode .btn-play-big:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--box-border) !important;
}

/* Rounder, stickier corners */
body.cartoonic-mode .lobby-mode-chip,
body.cartoonic-mode .diff-card,
body.cartoonic-mode .settings-row,
body.cartoonic-mode .info-card {
  border-radius: 16px !important;
}
body.cartoonic-mode .popup-btn-primary,
body.cartoonic-mode .popup-btn-secondary,
body.cartoonic-mode .popup-btn-danger {
  border-radius: 12px !important;
}

/* Toggle switches get an outline to match the sticker look */
body.cartoonic-mode .sw-track {
  border: 2px solid var(--box-border) !important;
  border-radius: 999px !important;
}
body.cartoonic-mode .toggle-box {
  border-width: 2.5px !important;
  border-color: var(--box-border) !important;
  border-radius: 5px !important;
}
body.cartoonic-mode .toggle-item.on .toggle-box {
  border-color: var(--box-border) !important;
}
body.cartoonic-mode .mistake-dot {
  border: 1.5px solid var(--box-border);
}

/* ── In-game screen + remaining buttons (previously missed) ── */
body.cartoonic-mode .btn-begin,
body.cartoonic-mode .diff-back-btn,
body.cartoonic-mode .btn-pause,
body.cartoonic-mode .game-act-btn,
body.cartoonic-mode .num-btn,
body.cartoonic-mode .btn-comp,
body.cartoonic-mode .lb-entry,
body.cartoonic-mode .lb-clear {
  border: 3px solid var(--box-border) !important;
  box-shadow: 4px 4px 0 var(--box-border) !important;
}
body.cartoonic-mode .diff-back-btn,
body.cartoonic-mode .btn-pause,
body.cartoonic-mode .game-act-btn {
  box-shadow: 3px 3px 0 var(--box-border) !important;
}
body.cartoonic-mode .num-btn {
  border-radius: 14px !important;
  box-shadow: 2px 2px 0 var(--box-border) !important;
}
body.cartoonic-mode .btn-begin,
body.cartoonic-mode .btn-comp {
  border-radius: 12px !important;
}

/* Press-down feel for the newly added buttons too */
body.cartoonic-mode .btn-begin:active,
body.cartoonic-mode .diff-back-btn:active,
body.cartoonic-mode .btn-pause:active,
body.cartoonic-mode .game-act-btn:active,
body.cartoonic-mode .num-btn:active,
body.cartoonic-mode .btn-comp:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--box-border) !important;
}

/* Extra headings pick up the cartoonic font too */
body.cartoonic-mode .diff-heading,
body.cartoonic-mode .complete-title,
body.cartoonic-mode .top-title,
body.cartoonic-mode #popup-stats .settings-section-label {
  font-family: "Baloo 2", "Crimson Pro", Georgia, serif;
  font-weight: 700;
}

/* Popup cards (pause / stats / new-game / reset) — a clean floating
   card with no chunky outline, just rounded corners + soft shadow.
   Keeps the buttons inside them cartoonic without the messy look of
   a border-inside-a-border. NOTE: .sponsor-card is intentionally
   excluded — it's a full-bleed layout with no card wrapper, so this
   shadow/radius would float around empty space with no background
   under it. */
body.cartoonic-mode .popup-card:not(.sponsor-card),
body.cartoonic-mode .confirm-box {
  border: none !important;
  border-radius: 20px !important;
  box-shadow: none !important;
}

/* Sponsor / ad page — its own elements get the cartoonic treatment
   directly, instead of a floating card shadow around the whole page. */
body.cartoonic-mode .sponsor-title {
  font-family: "Baloo 2", "Crimson Pro", Georgia, serif;
  font-weight: 700;
  font-size: clamp(1.5rem, 6vw, 2.5rem);
}
body.cartoonic-mode .sponsor-slot {
  border: 3px solid var(--box-border) !important;
  border-radius: 16px !important;
  box-shadow: 4px 4px 0 var(--box-border) !important;
}
body.cartoonic-mode .sponsor-skip-btn {
  border: 3px solid var(--box-border) !important;
  border-radius: 12px !important;
  box-shadow: 3px 3px 0 var(--box-border) !important;
}
body.cartoonic-mode .sponsor-skip-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--box-border) !important;
}

/* ── In-game topbar — badge, stat boxes, header bar, board ── */
body.cartoonic-mode .top-diff-badge {
  border: 2.5px solid var(--box-border) !important;
  box-shadow: 2px 2px 0 var(--box-border) !important;
}
body.cartoonic-mode .stat-item {
  background: var(--card-bg);
  border: 2.5px solid var(--box-border) !important;
  border-radius: 12px !important;
  padding: 4px 10px !important;
  box-shadow: 2px 2px 0 var(--box-border) !important;
}
body.cartoonic-mode .game-page-header {
  border-bottom: 3px solid var(--box-border) !important;
  box-shadow: 0 4px 0 var(--box-border) !important;
}
body.cartoonic-mode .grid-wrap {
  border: 4px solid var(--box-border) !important;
  box-shadow: 5px 5px 0 var(--box-border) !important;
}

/* Board numbers — match the Cartoonic Mode font instead of the
   default serif so the puzzle grid text looks consistent with the
   rest of the cartoonic UI. */
body.cartoonic-mode .cell-num {
  font-family: "Baloo 2", "DM Sans", sans-serif;
  font-weight: 700;
}
body.cartoonic-mode .pencil-mark {
  font-family: "Baloo 2", "DM Sans", sans-serif;
  font-weight: 600;
}