/* ==========================================================================
   2048x3D - Neo-Arcade & Frost Glass Design System
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800;900&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@500;700&display=swap');

:root {
  /* Surface & Background */
  --bg-deep: #070a12;
  --bg-subtle: #0d1322;
  --bg-glass: rgba(15, 23, 42, 0.65);
  --bg-glass-card: rgba(20, 30, 52, 0.55);
  --bg-glass-hover: rgba(30, 45, 75, 0.7);
  --bg-input: rgba(8, 12, 22, 0.85);

  /* Borders & Glass Dividers */
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-border-light: rgba(255, 255, 255, 0.16);
  --glass-border-glow: rgba(56, 189, 248, 0.45);
  --line: rgba(35, 48, 74, 0.6);

  /* Modern Gem & Candy Accents */
  --cyan: #38bdf8;
  --cyan-glow: rgba(56, 189, 248, 0.35);
  --emerald: #34d399;
  --emerald-glow: rgba(52, 211, 153, 0.35);
  --purple: #a855f7;
  --purple-glow: rgba(168, 85, 247, 0.35);
  --rose: #fb7185;
  --red: #f43f5e;
  --yellow: #fbbf24;
  --fever: #ec4899;

  /* Typography */
  --text-main: #f8fafc;
  --text-dim: #94a3b8;
  --text-muted: #64748b;
  --font-display: 'Outfit', 'Plus Jakarta Sans', sans-serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  /* Elevation & Lighting Shadows */
  --shadow-glass: 0 12px 32px 0 rgba(0, 0, 0, 0.45), inset 0 1px 1px 0 rgba(255, 255, 255, 0.12);
  --shadow-card: 0 8px 24px -4px rgba(0, 0, 0, 0.5), inset 0 1px 1px 0 rgba(255, 255, 255, 0.08);
  --shadow-glow-cyan: 0 0 20px -2px rgba(56, 189, 248, 0.4);

  /* Layout Insets */
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-top: env(safe-area-inset-top, 0px);
}

/* ==========================================================================
   Light Mode Design Variables & Color System
   ========================================================================== */
[data-theme="light"] {
  /* Surface & Background (Soft Pearl & Milky Frost) */
  --bg-deep: #f3f6fa;
  --bg-subtle: #e8edf5;
  --bg-glass: rgba(255, 255, 255, 0.78);
  --bg-glass-card: rgba(255, 255, 255, 0.68);
  --bg-glass-hover: rgba(255, 255, 255, 0.92);
  --bg-input: rgba(255, 255, 255, 0.92);

  /* Borders & Dividers */
  --glass-border: rgba(148, 163, 184, 0.22);
  --glass-border-light: rgba(148, 163, 184, 0.35);
  --glass-border-glow: rgba(14, 165, 233, 0.35);
  --line: rgba(226, 232, 240, 0.85);

  /* Elegant Gem & Candy Accents */
  --cyan: #0ea5e9;
  --cyan-glow: rgba(14, 165, 233, 0.22);
  --emerald: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.2);
  --purple: #8b5cf6;
  --purple-glow: rgba(139, 92, 246, 0.2);
  --rose: #f43f5e;
  --red: #e11d48;
  --yellow: #f59e0b;
  --fever: #ec4899;

  /* Typography (Balanced Soft Dark Navy / Slate) */
  --text-main: #1e293b;
  --text-dim: #475569;
  --text-muted: #64748b;

  /* Elevation & Ambient Shadows */
  --shadow-glass: 0 12px 30px -4px rgba(30, 41, 59, 0.07), inset 0 1px 1px 0 rgba(255, 255, 255, 0.95);
  --shadow-card: 0 6px 20px -2px rgba(30, 41, 59, 0.06), inset 0 1px 1px 0 rgba(255, 255, 255, 0.85);
  --shadow-glow-cyan: 0 0 16px -2px rgba(14, 165, 233, 0.25);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg-deep);
  color: var(--text-main);
  font-family: var(--font-sans);
  -webkit-text-size-adjust: 100%;
  letter-spacing: -0.01em;
}

#app {
  position: relative;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: radial-gradient(circle at 50% 30%, #111a2f 0%, #070a12 85%);
  transition: box-shadow 0.3s ease;
}

/* FEVER Mode Neon Screen Aura */
#app.fever-active {
  box-shadow: inset 0 0 50px rgba(236, 72, 153, 0.4), inset 0 0 100px rgba(56, 189, 248, 0.2);
  animation: fever-aura-pulse 1.2s infinite alternate ease-in-out;
}

@keyframes fever-aura-pulse {
  0% {
    box-shadow: inset 0 0 40px rgba(236, 72, 153, 0.3), inset 0 0 80px rgba(56, 189, 248, 0.15);
  }
  100% {
    box-shadow: inset 0 0 70px rgba(236, 72, 153, 0.6), inset 0 0 130px rgba(56, 189, 248, 0.35);
  }
}

/* ==========================================================================
   Top Global Navigation Bar (Frost Glass & Minimalist)
   ========================================================================== */
.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 18px;
  padding-top: max(8px, var(--safe-top));
  background: rgba(10, 14, 24, 0.75);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  font-size: 13px;
  font-family: var(--font-display);
  z-index: 25;
  gap: 12px;
}

.top-nav .brand-link {
  color: #fff;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.5px;
  font-size: 16px;
  display: flex;
  align-items: center;
  gap: 3px;
  white-space: nowrap;
  transition: opacity 0.2s ease;
}

.top-nav .brand-link:hover {
  opacity: 0.85;
}

.top-nav .brand-link span {
  background: linear-gradient(135deg, var(--cyan) 0%, var(--purple) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.top-nav .nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.top-nav .nav-right::-webkit-scrollbar { display: none; }

.top-nav .nav-links {
  display: flex;
  gap: 6px;
  align-items: center;
  white-space: nowrap;
}

.top-nav .nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 12.5px;
  font-weight: 500;
  padding: 5px 10px;
  border-radius: 20px;
  transition: all 0.15s ease;
}

.top-nav .nav-links a:hover,
.top-nav .nav-links a.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.top-nav .nav-links a.active {
  color: var(--cyan);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

/* Language & Theme Switcher Buttons */
button.lang-toggle-btn,
button.theme-toggle-btn {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-dim);
  border: 1px solid var(--glass-border-light);
  border-radius: 20px;
  padding: 4px 12px;
  font-family: var(--font-display);
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
  white-space: nowrap;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

button.lang-toggle-btn:hover,
button.lang-toggle-btn:active,
button.theme-toggle-btn:hover,
button.theme-toggle-btn:active {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #041424;
  box-shadow: 0 0 12px var(--cyan-glow);
}

[data-theme="light"] button.lang-toggle-btn,
[data-theme="light"] button.theme-toggle-btn {
  background: rgba(0, 0, 0, 0.04);
  color: var(--text-dim);
  border: 1px solid var(--glass-border-light);
}

[data-theme="light"] button.lang-toggle-btn:hover,
[data-theme="light"] button.theme-toggle-btn:hover {
  background: var(--cyan);
  color: #ffffff;
}

/* ==========================================================================
   Game Header & HUD (Neo-Arcade Floating HUD)
   ========================================================================== */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: rgba(12, 18, 30, 0.65);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-card);
  z-index: 20;
  flex-wrap: wrap;
  gap: 8px;
}

.titlerow {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  width: 100%;
  justify-content: space-between;
}

@media (min-width: 720px) {
  .titlerow { width: auto; justify-content: flex-start; }
}

h1 {
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.5px;
  margin: 0;
  font-weight: 800;
  color: var(--text-main);
  white-space: nowrap;
}

h1 span {
  background: linear-gradient(135deg, var(--cyan) 0%, var(--purple) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Pill-shaped Segmented Controls */
.nav-selectors {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  max-width: 100%;
}

.nav-selectors::-webkit-scrollbar { display: none; }

.segmented-control {
  display: flex;
  background: rgba(8, 13, 24, 0.85);
  border: 1px solid var(--glass-border-light);
  border-radius: 24px;
  padding: 3px;
  flex-shrink: 0;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.4);
}

.segmented-control button {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3px;
  padding: 4px 10px;
  background: transparent;
  border: none;
  border-radius: 18px;
  color: var(--text-dim);
  cursor: pointer;
  touch-action: manipulation;
  white-space: nowrap;
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

.segmented-control button.active {
  background: linear-gradient(135deg, var(--cyan) 0%, #0284c7 100%);
  color: #ffffff;
  font-weight: 700;
  box-shadow: 0 2px 8px var(--cyan-glow);
}

.segmented-control button[data-type="party"].active {
  background: linear-gradient(135deg, #ec4899 0%, #f59e0b 50%, #8b5cf6 100%);
  color: #ffffff;
  font-weight: 800;
  box-shadow: 0 2px 12px rgba(236, 72, 153, 0.5);
  animation: party-glow 2s infinite alternate;
}

@keyframes party-glow {
  0% { filter: drop-shadow(0 0 4px rgba(236, 72, 153, 0.4)); }
  100% { filter: drop-shadow(0 0 8px rgba(245, 158, 11, 0.7)); }
}

.segmented-control button:not(.active):hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}

/* Stats HUD (Frosted Glass Mini Cards) */
.stats {
  display: flex;
  gap: 8px;
  align-items: center;
  font-family: var(--font-display);
  flex-wrap: wrap;
  width: 100%;
  justify-content: space-between;
}

@media (min-width: 720px) {
  .stats { width: auto; justify-content: flex-end; }
}

.stat {
  background: rgba(18, 26, 44, 0.7);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-card);
  border-radius: 10px;
  padding: 4px 10px;
  text-align: center;
  min-width: 58px;
  flex: 1;
  max-width: 100px;
  transition: all 0.2s ease;
}

.stat:hover {
  border-color: var(--glass-border-light);
  transform: translateY(-1px);
}

.stat .label {
  font-size: 8.5px;
  font-weight: 700;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 1px;
}

.stat .value {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  color: #fff;
  white-space: nowrap;
}

.stat#scoreStat .value { color: var(--cyan); }
.stat#bestStat .value { color: var(--emerald); }
.stat.timer .value { color: var(--yellow); }
.stat.moves .value { color: var(--purple); }

/* Timer Warning Pulse */
.stat.timer.warning {
  border-color: var(--red);
  box-shadow: 0 0 16px rgba(244, 63, 94, 0.5);
  animation: pulse-warn 0.8s infinite alternate ease-in-out;
}

.stat.timer.warning .value {
  color: var(--red);
}

@keyframes pulse-warn {
  from { transform: scale(1); }
  to { transform: scale(1.06); filter: brightness(1.2); }
}

/* Tool Controls (Audio, SE, Theme) */
.tool-controls {
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(18, 26, 44, 0.7);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 3px 8px;
}

.iconbtn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 14px;
  cursor: pointer;
  padding: 3px;
  line-height: 1;
  touch-action: manipulation;
  transition: all 0.15s ease;
  border-radius: 50%;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.iconbtn:hover, .iconbtn:active {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.iconbtn.active {
  color: var(--cyan);
  background: rgba(56, 189, 248, 0.15);
}

#volumeSlider {
  width: 42px;
  accent-color: var(--cyan);
  cursor: pointer;
  touch-action: manipulation;
}

select.themepicker {
  background: rgba(8, 13, 24, 0.6);
  color: var(--text-dim);
  border: 1px solid var(--glass-border);
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 600;
  padding: 3px 6px;
  border-radius: 12px;
  cursor: pointer;
  outline: none;
  transition: border-color 0.15s ease;
}

select.themepicker:hover {
  border-color: var(--glass-border-light);
  color: #fff;
}

select.themepicker option {
  background: #0d1527;
  color: var(--text-main);
}

/* Action Buttons (UNDO, RESET) */
button.reset {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border-light);
  border-radius: 20px;
  color: var(--text-dim);
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  padding: 5px 12px;
  cursor: pointer;
  touch-action: manipulation;
  transition: all 0.15s ease;
}

button.reset:hover, button.reset:active {
  border-color: var(--rose);
  color: #fff;
  background: rgba(251, 113, 133, 0.2);
  box-shadow: 0 0 10px rgba(251, 113, 133, 0.3);
}

button.undo-btn {
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.4);
  border-radius: 20px;
  color: #d8b4fe;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  padding: 5px 12px;
  cursor: pointer;
  touch-action: manipulation;
  transition: all 0.15s ease;
}

button.undo-btn:not(:disabled):hover,
button.undo-btn:not(:disabled):active {
  background: var(--purple);
  color: #ffffff;
  box-shadow: 0 0 14px var(--purple-glow);
  transform: translateY(-1px);
}

button.undo-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* ==========================================================================
   Game Stage & 3D Canvas
   ========================================================================== */
.game-layout {
  position: relative;
  flex: 1;
  display: flex;
  min-height: 0;
  overflow: hidden;
}

.side-ad-slot {
  width: 160px;
  background: rgba(10, 15, 26, 0.4);
  border-right: 1px solid var(--glass-border);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 10px;
  position: relative;
  z-index: 5;
}

.side-ad-slot.right {
  border-right: none;
  border-left: 1px solid var(--glass-border);
}

@media (min-width: 1080px) {
  .side-ad-slot { display: flex; }
}

.ad-label {
  position: absolute;
  top: 6px;
  left: 8px;
  font-size: 9px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* 3D Canvas Stage */
#stage {
  position: relative;
  flex: 1;
  width: 100%;
  height: 100%;
  outline: none;
  touch-action: none;
  cursor: grab;
}

#stage:active { cursor: grabbing; }

/* Control Mode Switcher Banner (Floating Pill) */
#controlModeBanner {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 4px;
  background: rgba(12, 18, 30, 0.85);
  border: 1px solid var(--glass-border-light);
  padding: 4px;
  border-radius: 28px;
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  z-index: 12;
  box-shadow: var(--shadow-glass);
}

#controlModeBanner button {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 11px;
  font-family: var(--font-display);
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 20px;
  cursor: pointer;
  touch-action: manipulation;
  white-space: nowrap;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

#controlModeBanner button.active {
  background: linear-gradient(135deg, var(--cyan) 0%, #0284c7 100%);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 2px 10px var(--cyan-glow);
}

/* Axis Legend */
.axis-legend {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(12, 18, 30, 0.75);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-card);
  padding: 8px 12px;
  border-radius: 12px;
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 600;
  line-height: 1.4;
  backdrop-filter: blur(12px);
  pointer-events: none;
  z-index: 5;
}

.axis-legend .row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 2px;
}

.axis-legend .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 6px currentColor;
}

.axis-legend .hint {
  font-size: 8.5px;
  color: var(--text-muted);
  margin-top: 4px;
  display: none;
}

@media (min-width: 520px) {
  .axis-legend .hint { display: block; }
}

/* Combo & Fever */
#comboBarContainer {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  pointer-events: none;
  z-index: 5;
}

.combobadge {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 800;
  color: var(--cyan);
  opacity: 0;
  transform: translateY(-4px);
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.combobadge.show {
  opacity: 1;
  transform: translateY(0);
}

.combobadge.fever {
  color: #fff;
  text-shadow: 0 0 10px var(--fever), 0 0 20px var(--fever);
  animation: fever-pulse 0.4s infinite alternate ease-in-out;
}

@keyframes fever-pulse {
  from { transform: scale(1); }
  to { transform: scale(1.15); }
}

.combogauge-bg {
  width: 84px;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--glass-border);
}

.combogauge-fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--fever));
  box-shadow: 0 0 8px var(--cyan-glow);
  transition: width 0.2s ease;
}

/* ==========================================================================
   Footer & Arcade Touch Pad Controls
   ========================================================================== */
footer {
  display: flex;
  justify-content: center;
  gap: 16px;
  padding: 8px 12px max(10px, var(--safe-bottom));
  background: rgba(12, 18, 30, 0.75);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--glass-border);
  box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.35);
  z-index: 20;
  flex-wrap: nowrap;
}

.padgroup {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}

.padgroup .glabel {
  font-family: var(--font-display);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.padgroup.gx .glabel { color: var(--rose); }
.padgroup.gy .glabel { color: var(--cyan); }
.padgroup.gz .glabel { color: #c084fc; }

.padrow {
  display: flex;
  gap: 4px;
}

.padbtn {
  width: 48px;
  height: 40px;
  background: rgba(20, 29, 48, 0.75);
  border: 1px solid var(--glass-border-light);
  box-shadow: var(--shadow-card);
  border-radius: 10px;
  color: var(--text-main);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: manipulation;
  user-select: none;
  transition: all 0.12s cubic-bezier(0.4, 0, 0.2, 1);
}

.padbtn:hover {
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(30, 42, 68, 0.85);
}

.padbtn:active {
  background: linear-gradient(135deg, var(--cyan) 0%, #0284c7 100%);
  color: #fff;
  border-color: var(--cyan);
  transform: translateY(2px) scale(0.95);
  box-shadow: 0 0 14px var(--cyan-glow);
}

.padbtn.merge-hint {
  border-color: var(--cyan);
  box-shadow: 0 0 10px var(--cyan-glow);
  animation: hint-glow 1.2s infinite alternate ease-in-out;
}

@keyframes hint-glow {
  from { border-color: rgba(56, 189, 248, 0.4); box-shadow: 0 0 4px rgba(56, 189, 248, 0.2); }
  to { border-color: var(--cyan); box-shadow: 0 0 14px var(--cyan-glow); }
}

.kbhint {
  font-family: var(--font-mono);
  font-size: 8px;
  color: var(--text-muted);
}

/* ==========================================================================
   Modals & Result Overlays (Cinema Frosted Glass)
   ========================================================================== */
#overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(7, 11, 20, 0.88);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 30;
  padding: 24px;
  text-align: center;
  animation: fadeIn 0.25s ease;
}

#overlay.show { display: flex; }

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

#overlayTitle {
  font-family: var(--font-display);
  font-size: clamp(26px, 6vw, 36px);
  font-weight: 900;
  letter-spacing: 1px;
  margin: 0 0 8px;
  background: linear-gradient(135deg, #fff 0%, var(--cyan) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

#overlaySub {
  font-size: clamp(13px, 3.5vw, 15px);
  color: var(--text-dim);
  margin: 0 0 20px;
}

.modal-ad-slot {
  background: rgba(255, 255, 255, 0.03);
  border: 1px dashed var(--glass-border-light);
  border-radius: 12px;
  padding: 10px;
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  max-width: 100%;
  min-width: 240px;
}

.overlay-btns {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn-primary {
  font-family: var(--font-display);
  background: linear-gradient(135deg, var(--cyan) 0%, #0284c7 100%);
  color: #ffffff;
  border: none;
  padding: 12px 26px;
  border-radius: 24px;
  font-size: 13.5px;
  letter-spacing: 0.5px;
  cursor: pointer;
  font-weight: 800;
  touch-action: manipulation;
  box-shadow: 0 4px 16px var(--cyan-glow);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 44px;
}

.btn-primary:hover, .btn-primary:active {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(56, 189, 248, 0.6);
  filter: brightness(1.1);
}

.btn-secondary {
  font-family: var(--font-display);
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  border: 1px solid var(--glass-border-light);
  padding: 12px 22px;
  border-radius: 24px;
  font-size: 13.5px;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
  transition: all 0.2s ease;
  min-height: 44px;
}

.btn-secondary:hover, .btn-secondary:active {
  border-color: var(--cyan);
  background: rgba(56, 189, 248, 0.12);
  color: var(--cyan);
  transform: translateY(-2px);
}

.btn-share {
  background: #000;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-share:hover, .btn-share:active {
  background: #1e1e1e;
  border-color: #fff;
}

#replayControls {
  position: absolute;
  bottom: 74px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(12, 18, 30, 0.9);
  border: 1px solid var(--glass-border-light);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  padding: 6px 16px;
  border-radius: 30px;
  display: none;
  align-items: center;
  gap: 12px;
  z-index: 15;
  box-shadow: var(--shadow-glass);
}

#replayControls.show { display: flex; }

#replayInfo {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  color: var(--cyan);
}

/* ==========================================================================
   TOP PORTAL / LANDING PAGE (Modern Arcade Showcase)
   ========================================================================== */
.portal-page {
  min-height: 100vh;
  min-height: 100dvh;
  background: radial-gradient(circle at 50% 15%, #141f38 0%, #070a12 75%);
  color: var(--text-main);
  line-height: 1.6;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.portal-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 30px 18px max(50px, var(--safe-bottom));
}

/* Hero Section */
.hero-section {
  text-align: center;
  padding: 40px 14px 50px;
  position: relative;
}

.hero-badge {
  display: inline-block;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--cyan);
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  padding: 6px 18px;
  border-radius: 30px;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.2);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(38px, 10vw, 68px);
  font-weight: 900;
  letter-spacing: clamp(1px, 1vw, 2px);
  margin: 0 0 12px;
  color: #fff;
  line-height: 1.1;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.hero-title span {
  background: linear-gradient(135deg, var(--cyan) 0%, var(--purple) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(16px, 4.5vw, 22px);
  font-weight: 700;
  color: #e2e8f0;
  margin: 0 0 16px;
  line-height: 1.4;
}

.hero-desc {
  max-width: 660px;
  margin: 0 auto 30px;
  color: var(--text-dim);
  font-size: clamp(13.5px, 3.5vw, 15.5px);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-direction: column;
  align-items: center;
}

@media (min-width: 520px) {
  .hero-actions { flex-direction: row; }
}

.btn-hero-play {
  font-family: var(--font-display);
  background: linear-gradient(135deg, var(--cyan) 0%, #0284c7 100%);
  color: #ffffff;
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 800;
  text-decoration: none;
  letter-spacing: 0.5px;
  box-shadow: 0 6px 24px var(--cyan-glow);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  max-width: 260px;
  min-height: 50px;
  touch-action: manipulation;
}

.btn-hero-play:hover, .btn-hero-play:active {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 10px 32px rgba(56, 189, 248, 0.6);
  filter: brightness(1.1);
}

.btn-hero-guide {
  font-family: var(--font-display);
  background: rgba(20, 28, 48, 0.7);
  border: 1px solid var(--glass-border-light);
  color: #fff;
  padding: 14px 28px;
  border-radius: 30px;
  font-size: 14.5px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--shadow-card);
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  max-width: 260px;
  min-height: 50px;
  touch-action: manipulation;
}

.btn-hero-guide:hover, .btn-hero-guide:active {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(56, 189, 248, 0.1);
  transform: translateY(-2px);
}

/* Sections */
.portal-section {
  margin-bottom: 50px;
}

.section-header {
  text-align: center;
  margin-bottom: 28px;
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 5vw, 30px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
  color: #fff;
}

.section-header p {
  color: var(--text-dim);
  font-size: clamp(13px, 3.2vw, 15px);
  margin: 0;
}

/* Mode Selection Cards Grid */
.modes-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

@media (min-width: 600px) {
  .modes-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
}

@media (min-width: 960px) {
  .modes-grid { grid-template-columns: repeat(4, 1fr); gap: 20px; }
}

.mode-card {
  background: rgba(18, 26, 44, 0.65);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass);
  border-radius: 20px;
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.mode-card:hover {
  border-color: var(--glass-border-glow);
  transform: translateY(-6px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5), 0 0 20px rgba(56, 189, 248, 0.2);
}

.mode-card.featured {
  border-color: rgba(56, 189, 248, 0.4);
  background: linear-gradient(180deg, rgba(56, 189, 248, 0.1) 0%, rgba(18, 26, 44, 0.7) 100%);
}

.mode-card.hard {
  border-color: rgba(244, 63, 94, 0.4);
  background: linear-gradient(180deg, rgba(244, 63, 94, 0.1) 0%, rgba(18, 26, 44, 0.7) 100%);
}

.mode-card.hard:hover {
  border-color: var(--red);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5), 0 0 20px rgba(244, 63, 94, 0.3);
}

.mode-badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-dim);
  margin-bottom: 14px;
}

.mode-card.featured .mode-badge {
  background: rgba(56, 189, 248, 0.18);
  color: var(--cyan);
  border: 1px solid rgba(56, 189, 248, 0.35);
}

.mode-card.hard .mode-badge {
  background: rgba(244, 63, 94, 0.18);
  color: var(--rose);
  border: 1px solid rgba(244, 63, 94, 0.35);
}

.mode-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  margin: 0 0 8px;
  color: #fff;
}

.mode-card p {
  color: var(--text-dim);
  font-size: 13px;
  line-height: 1.6;
  margin: 0 0 20px;
  flex: 1;
}

.mode-card-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
}

.btn-card-play {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 800;
  text-align: center;
  padding: 12px 16px;
  border-radius: 14px;
  text-decoration: none;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: var(--cyan);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  touch-action: manipulation;
}

.btn-card-play:hover, .btn-card-play:active {
  background: linear-gradient(135deg, var(--cyan) 0%, #0284c7 100%);
  border-color: var(--cyan);
  color: #fff;
  box-shadow: 0 4px 16px var(--cyan-glow);
}

.btn-card-play.secondary-btn {
  background: rgba(168, 85, 247, 0.12);
  border-color: rgba(168, 85, 247, 0.35);
  color: #c084fc;
}

.btn-card-play.secondary-btn:hover,
.btn-card-play.secondary-btn:active {
  background: linear-gradient(135deg, var(--purple) 0%, #7e22ce 100%);
  border-color: var(--purple);
  color: #fff;
  box-shadow: 0 4px 16px var(--purple-glow);
}

.mode-card.hard .btn-card-play {
  background: rgba(244, 63, 94, 0.12);
  border-color: rgba(244, 63, 94, 0.35);
  color: var(--rose);
}

.mode-card.hard .btn-card-play:hover,
.mode-card.hard .btn-card-play:active {
  background: linear-gradient(135deg, var(--rose) 0%, #e11d48 100%);
  border-color: var(--red);
  color: #fff;
  box-shadow: 0 4px 16px rgba(244, 63, 94, 0.4);
}

/* Tutorial Steps Grid */
.tutorial-steps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 600px) {
  .tutorial-steps-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }
}

@media (min-width: 960px) {
  .tutorial-steps-grid { grid-template-columns: repeat(4, 1fr); gap: 20px; }
}

.tutorial-step-card {
  background: rgba(18, 26, 44, 0.55);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  border-radius: 18px;
  padding: 20px;
  position: relative;
  box-shadow: var(--shadow-card);
  transition: all 0.2s ease;
}

.tutorial-step-card:hover {
  border-color: var(--glass-border-light);
  transform: translateY(-2px);
}

.tutorial-step-card .step-icon {
  font-size: 26px;
  margin-bottom: 12px;
  display: inline-block;
}

.tutorial-step-card h4 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  color: var(--cyan);
  margin: 0 0 8px;
}

.tutorial-step-card p {
  color: var(--text-dim);
  font-size: 13px;
  margin: 0;
  line-height: 1.6;
}

/* Feature Showcase Grid */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 520px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
}

@media (min-width: 880px) {
  .features-grid { grid-template-columns: repeat(4, 1fr); gap: 16px; }
}

.feature-item {
  background: rgba(18, 26, 44, 0.45);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  padding: 18px;
  transition: all 0.2s ease;
}

.feature-item:hover {
  border-color: var(--glass-border-light);
}

.feature-item h4 {
  font-family: var(--font-display);
  font-size: 14.5px;
  font-weight: 700;
  color: #fff;
  margin: 0 0 6px;
}

.feature-item p {
  color: var(--text-muted);
  font-size: 12.5px;
  margin: 0;
  line-height: 1.5;
}

/* ==========================================================================
   Documentation & Sub Pages
   ========================================================================== */
.doc-page {
  min-height: 100vh;
  min-height: 100dvh;
  background: radial-gradient(circle at 50% 10%, #141f38 0%, #070a12 80%);
  color: var(--text-main);
  line-height: 1.7;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.doc-container {
  max-width: 880px;
  margin: 0 auto;
  padding: 30px 18px max(60px, var(--safe-bottom));
}

.doc-header {
  border-bottom: 1px solid var(--glass-border);
  padding-bottom: 20px;
  margin-bottom: 24px;
}

.doc-header h1 {
  font-family: var(--font-display);
  font-size: clamp(22px, 5vw, 30px);
  font-weight: 900;
  margin-bottom: 8px;
}

.doc-header p {
  color: var(--text-dim);
  font-size: 14px;
  margin: 0;
}

.doc-section {
  background: rgba(18, 26, 44, 0.6);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-card);
  border-radius: 18px;
  padding: 24px 20px;
  margin-bottom: 24px;
}

.doc-section h2 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--cyan);
  margin-top: 0;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--glass-border);
  padding-bottom: 8px;
}

.doc-section h3 {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-top: 18px;
  margin-bottom: 8px;
}

.doc-section p, .doc-section li {
  color: #cbd5e1;
  font-size: 13.5px;
  line-height: 1.7;
}

.doc-section ul, .doc-section ol {
  padding-left: 20px;
  margin-bottom: 16px;
}

.doc-section li { margin-bottom: 6px; }

.tip-box {
  background: rgba(56, 189, 248, 0.08);
  border-left: 3px solid var(--cyan);
  padding: 14px 18px;
  border-radius: 0 12px 12px 0;
  margin: 18px 0;
  font-size: 13px;
}

.tip-box strong { color: var(--cyan); }

.key-badge {
  background: rgba(30, 42, 68, 0.8);
  border: 1px solid var(--glass-border-light);
  border-radius: 6px;
  padding: 2px 7px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--cyan);
}

.doc-footer {
  text-align: center;
  padding: 30px 0;
  border-top: 1px solid var(--glass-border);
  color: var(--text-muted);
  font-size: 12px;
  font-family: var(--font-display);
  line-height: 1.8;
}

/* ==========================================================================
   World Leaderboard / Ranking Styles
   ========================================================================== */
.ranking-section {
  background: rgba(18, 26, 44, 0.65);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 28px 22px;
  margin-bottom: 50px;
  box-shadow: var(--shadow-glass);
}

.ranking-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.ranking-tab-btn {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  padding: 7px 18px;
  background: rgba(8, 13, 24, 0.7);
  border: 1px solid var(--glass-border-light);
  color: var(--text-dim);
  border-radius: 24px;
  cursor: pointer;
  touch-action: manipulation;
  transition: all 0.2s ease;
}

.ranking-tab-btn:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
}

.ranking-tab-btn.active {
  background: linear-gradient(135deg, var(--cyan) 0%, #0284c7 100%);
  border-color: var(--cyan);
  color: #fff;
  box-shadow: 0 2px 10px var(--cyan-glow);
}

.ranking-table-container {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: 14px;
  border: 1px solid var(--glass-border);
  background: rgba(8, 13, 24, 0.8);
}

.ranking-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-display);
  font-size: 13px;
  text-align: left;
  min-width: 420px;
}

.ranking-table th {
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-muted);
  padding: 12px 16px;
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--glass-border);
}

.ranking-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  font-weight: 600;
}

.ranking-table tr:last-child td {
  border-bottom: none;
}

.ranking-table tr:hover td {
  background: rgba(56, 189, 248, 0.06);
}

/* Rank Badges */
.rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 800;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-dim);
}

.rank-badge.rank-1 {
  background: linear-gradient(135deg, #fbbf24 0%, #d97706 100%);
  color: #000;
  box-shadow: 0 0 12px rgba(251, 191, 36, 0.5);
}

.rank-badge.rank-2 {
  background: linear-gradient(135deg, #e2e8f0 0%, #94a3b8 100%);
  color: #000;
  box-shadow: 0 0 10px rgba(226, 232, 240, 0.4);
}

.rank-badge.rank-3 {
  background: linear-gradient(135deg, #fb7185 0%, #e11d48 100%);
  color: #fff;
  box-shadow: 0 0 10px rgba(251, 113, 133, 0.4);
}

.rank-score {
  color: var(--cyan);
  font-weight: 800;
  font-family: var(--font-display);
}

.rank-time {
  color: var(--yellow);
  font-weight: 800;
  font-family: var(--font-mono);
}

/* Score Submission Card */
.score-submit-card {
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: 16px;
  padding: 16px 20px;
  margin-bottom: 20px;
  width: 100%;
  max-width: 340px;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.15);
}

.score-submit-card h4 {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
  color: var(--cyan);
  margin: 0 0 4px;
}

.score-submit-card p {
  font-size: 11.5px;
  color: var(--text-dim);
  margin: 0 0 12px;
}

.score-submit-row {
  display: flex;
  gap: 8px;
}

.score-name-input {
  flex: 1;
  background: rgba(8, 12, 22, 0.9);
  border: 1px solid var(--glass-border-light);
  border-radius: 20px;
  padding: 8px 14px;
  color: #fff;
  font-family: var(--font-display);
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s ease;
}

.score-name-input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 10px var(--cyan-glow);
}

.btn-submit-score {
  font-family: var(--font-display);
  background: linear-gradient(135deg, var(--cyan) 0%, #0284c7 100%);
  color: #fff;
  border: none;
  border-radius: 20px;
  padding: 8px 16px;
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
  touch-action: manipulation;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.btn-submit-score:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.score-submitted-msg {
  color: var(--emerald);
  font-size: 12.5px;
  font-weight: 700;
  padding: 8px 0;
  display: none;
}

/* Ranking Modal */
.ranking-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  background: rgba(7, 11, 20, 0.88);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.ranking-modal-overlay.show {
  display: flex;
}

.ranking-modal-content {
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid var(--glass-border-light);
  border-radius: 20px;
  width: 100%;
  max-width: 580px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7);
  overflow: hidden;
  animation: fadeIn 0.2s ease;
}

.ranking-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 22px;
  border-bottom: 1px solid var(--glass-border);
  background: rgba(8, 12, 22, 0.8);
}

.ranking-modal-header h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  color: var(--cyan);
}

.ranking-modal-close {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 20px;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
  border-radius: 50%;
  transition: all 0.15s ease;
}

.ranking-modal-close:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.ranking-modal-body {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
}

/* ==========================================================================
   Responsive Utilities
   ========================================================================== */
@media (max-width: 600px) {
  .top-nav { padding: 6px 12px; }
  .top-nav .nav-right { gap: 8px; }
  .top-nav .nav-links { gap: 4px; }
  .top-nav .nav-links a { font-size: 11px; padding: 4px 8px; }
  .padbtn { width: 44px; height: 38px; font-size: 13px; }
}

@media (max-width: 380px) {
  .padbtn { width: 38px; height: 34px; font-size: 12px; }
  footer { gap: 8px; }
  .stat { min-width: 44px; padding: 3px 6px; }
  .stat .value { font-size: 12.5px; }
  .segmented-control button { padding: 3px 6px; font-size: 9.5px; }
}

/* ==========================================================================
   PARTY Mode Card & Light Theme UI Polishing
   ========================================================================== */

/* Party Mode Special Card */
.mode-card.party {
  border-color: rgba(236, 72, 153, 0.35);
  background: linear-gradient(145deg, rgba(236, 72, 153, 0.08) 0%, rgba(245, 158, 11, 0.06) 50%, var(--bg-glass-card) 100%);
}

.mode-card.party:hover {
  border-color: rgba(236, 72, 153, 0.6);
  box-shadow: 0 12px 36px -4px rgba(236, 72, 153, 0.25);
  transform: translateY(-4px);
}

.mode-card.party .mode-badge {
  background: linear-gradient(135deg, #ec4899 0%, #f59e0b 100%);
  color: #fff;
}

.mode-card.party .btn-play-mode {
  background: linear-gradient(135deg, #ec4899 0%, #f59e0b 100%);
  color: #fff;
  border: none;
}

.mode-card.party .btn-play-mode:hover {
  box-shadow: 0 4px 16px rgba(236, 72, 153, 0.4);
}

/* ==========================================================================
   Light Theme Overrides - Refined "Pearl Frost & Soft Slate" Design
   ========================================================================== */
[data-theme="light"] body {
  background: linear-gradient(180deg, #f8fafc 0%, #edf2f7 100%);
  color: var(--text-main);
}

[data-theme="light"] #app {
  background: radial-gradient(circle at 50% 25%, #ffffff 0%, #f0f4f9 60%, #e2e8f0 100%);
}

[data-theme="light"] .top-nav {
  background: rgba(255, 255, 255, 0.82);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.04);
}

[data-theme="light"] .top-nav .brand-link {
  color: #1e293b;
}

[data-theme="light"] .top-nav .nav-links a {
  color: var(--text-dim);
}

[data-theme="light"] .top-nav .nav-links a:hover,
[data-theme="light"] .top-nav .nav-links a.active {
  color: #1e293b;
  background: rgba(15, 23, 42, 0.05);
}

[data-theme="light"] .top-nav .nav-links a.active {
  color: var(--cyan);
  background: rgba(14, 165, 233, 0.08);
  border: 1px solid rgba(14, 165, 233, 0.25);
}

[data-theme="light"] header {
  background: rgba(255, 255, 255, 0.82);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.03);
}

[data-theme="light"] .segmented-control {
  background: rgba(226, 232, 240, 0.65);
  border: 1px solid var(--glass-border);
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.04);
}

[data-theme="light"] .segmented-control button {
  color: var(--text-dim);
}

[data-theme="light"] .segmented-control button:not(.active):hover {
  color: #1e293b;
  background: rgba(255, 255, 255, 0.6);
}

[data-theme="light"] .segmented-control button.active {
  background: linear-gradient(135deg, var(--cyan) 0%, #0284c7 100%);
  color: #ffffff;
  box-shadow: 0 2px 8px var(--cyan-glow);
}

[data-theme="light"] .stat {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-card);
}

[data-theme="light"] .stat .label {
  color: var(--text-muted);
}

[data-theme="light"] .stat .value {
  color: var(--text-main);
}

[data-theme="light"] .stat.warning {
  border-color: rgba(244, 63, 94, 0.4);
  background: rgba(254, 242, 242, 0.9);
}

[data-theme="light"] .iconbtn,
[data-theme="light"] .actionbtn,
[data-theme="light"] .themepicker {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--glass-border);
  color: var(--text-main);
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.03);
}

[data-theme="light"] .iconbtn:hover,
[data-theme="light"] .actionbtn:hover,
[data-theme="light"] .themepicker:hover {
  background: #ffffff;
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 3px 10px var(--cyan-glow);
}

[data-theme="light"] .padbtn {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--glass-border);
  color: var(--text-main);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.04);
}

[data-theme="light"] .padbtn:hover {
  background: #ffffff;
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 4px 12px var(--cyan-glow);
}

[data-theme="light"] .portal-container {
  background: transparent;
}

[data-theme="light"] .hero-title {
  color: #1e293b;
}

[data-theme="light"] .hero-subtitle {
  color: var(--text-dim);
}

[data-theme="light"] .hero-desc {
  color: var(--text-muted);
}

[data-theme="light"] .hero-badge {
  background: rgba(14, 165, 233, 0.08);
  border: 1px solid rgba(14, 165, 233, 0.2);
  color: var(--cyan);
}

[data-theme="light"] .btn-hero-play {
  background: linear-gradient(135deg, var(--cyan) 0%, #0284c7 100%);
  color: #ffffff;
  box-shadow: 0 6px 20px var(--cyan-glow);
}

[data-theme="light"] .btn-hero-guide {
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--glass-border);
  color: var(--text-main);
}

[data-theme="light"] .btn-hero-guide:hover {
  background: #ffffff;
  border-color: var(--cyan);
  color: var(--cyan);
}

[data-theme="light"] .mode-card,
[data-theme="light"] .portal-card,
[data-theme="light"] .tut-card,
[data-theme="light"] .feat-card,
[data-theme="light"] .ranking-preview-card,
[data-theme="light"] .ranking-modal-content,
[data-theme="light"] .modal,
[data-theme="light"] .guide-card,
[data-theme="light"] .policy-card,
[data-theme="light"] .contact-card {
  background: rgba(255, 255, 255, 0.72);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-card);
  color: var(--text-main);
}

[data-theme="light"] .mode-card:hover {
  border-color: rgba(14, 165, 233, 0.35);
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.06), 0 0 16px rgba(14, 165, 233, 0.1);
}

[data-theme="light"] .mode-card.featured {
  background: linear-gradient(180deg, rgba(14, 165, 233, 0.06) 0%, rgba(255, 255, 255, 0.85) 100%);
  border-color: rgba(14, 165, 233, 0.25);
}

[data-theme="light"] .mode-card.hard {
  background: linear-gradient(180deg, rgba(244, 63, 94, 0.06) 0%, rgba(255, 255, 255, 0.85) 100%);
  border-color: rgba(244, 63, 94, 0.25);
}

[data-theme="light"] .mode-card.party {
  background: linear-gradient(180deg, rgba(236, 72, 153, 0.06) 0%, rgba(255, 255, 255, 0.85) 100%);
  border-color: rgba(236, 72, 153, 0.25);
}

[data-theme="light"] .mode-card h3 {
  color: #1e293b;
}

[data-theme="light"] .mode-card p {
  color: var(--text-dim);
}

[data-theme="light"] .mode-badge {
  background: rgba(15, 23, 42, 0.06);
  color: var(--text-dim);
}

[data-theme="light"] .mode-card.featured .mode-badge {
  background: rgba(14, 165, 233, 0.1);
  color: var(--cyan);
  border: 1px solid rgba(14, 165, 233, 0.2);
}

[data-theme="light"] .mode-card.hard .mode-badge {
  background: rgba(244, 63, 94, 0.1);
  color: var(--rose);
  border: 1px solid rgba(244, 63, 94, 0.2);
}

[data-theme="light"] .mode-card.party .mode-badge {
  background: rgba(236, 72, 153, 0.1);
  color: var(--fever);
  border: 1px solid rgba(236, 72, 153, 0.2);
}

[data-theme="light"] .btn-card-play {
  background: rgba(14, 165, 233, 0.08);
  border: 1px solid rgba(14, 165, 233, 0.25);
  color: #0284c7;
}

[data-theme="light"] .btn-card-play:hover,
[data-theme="light"] .btn-card-play:active {
  background: linear-gradient(135deg, var(--cyan) 0%, #0284c7 100%);
  border-color: var(--cyan);
  color: #ffffff;
  box-shadow: 0 4px 14px var(--cyan-glow);
}

[data-theme="light"] .btn-card-play.secondary-btn {
  background: rgba(139, 92, 246, 0.08);
  border: 1px solid rgba(139, 92, 246, 0.25);
  color: #7c3aed;
}

[data-theme="light"] .btn-card-play.secondary-btn:hover,
[data-theme="light"] .btn-card-play.secondary-btn:active {
  background: linear-gradient(135deg, var(--purple) 0%, #7c3aed 100%);
  border-color: var(--purple);
  color: #ffffff;
  box-shadow: 0 4px 14px var(--purple-glow);
}

[data-theme="light"] .modal-ad-slot {
  background: rgba(255, 255, 255, 0.55);
  border-color: var(--glass-border);
}

[data-theme="light"] .modal-ad-slot .ad-label {
  background: rgba(15, 23, 42, 0.04);
  color: var(--text-muted);
}

[data-theme="light"] .ranking-section {
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-card);
}

[data-theme="light"] .ranking-table th {
  background: rgba(241, 245, 249, 0.85);
  color: var(--text-dim);
  border-bottom: 1px solid var(--glass-border);
}

[data-theme="light"] .ranking-table td {
  border-bottom: 1px solid rgba(226, 232, 240, 0.7);
  color: var(--text-main);
}

[data-theme="light"] .ranking-table tr:hover td {
  background: rgba(14, 165, 233, 0.04);
}

[data-theme="light"] .portal-footer,
[data-theme="light"] footer {
  border-top: 1px solid var(--glass-border);
  color: var(--text-muted);
}

[data-theme="light"] input[type="text"],
[data-theme="light"] input[type="email"],
[data-theme="light"] textarea,
[data-theme="light"] select {
  background: var(--bg-input);
  border: 1px solid var(--glass-border);
  color: var(--text-main);
}

[data-theme="light"] input[type="text"]:focus,
[data-theme="light"] input[type="email"]:focus,
[data-theme="light"] textarea:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px var(--cyan-glow);
}

[data-theme="light"] .tutorial-step-card,
[data-theme="light"] .feature-item {
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-card);
}

[data-theme="light"] .tutorial-step-card h4,
[data-theme="light"] .feature-item h4 {
  color: #1e293b;
}

[data-theme="light"] .tutorial-step-card p,
[data-theme="light"] .feature-item p {
  color: var(--text-dim);
}

[data-theme="light"] #overlay {
  background: rgba(241, 245, 249, 0.88);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.12);
}

[data-theme="light"] #overlay h2 {
  color: #1e293b;
}

[data-theme="light"] #overlay p {
  color: var(--text-dim);
}

[data-theme="light"] .score-submit-card {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--glass-border);
}

[data-theme="light"] .score-submit-card h4 {
  color: #1e293b;
}

[data-theme="light"] .score-submit-card p {
  color: var(--text-muted);
}

[data-theme="light"] #controlModeBanner {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--glass-border);
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.05);
}

[data-theme="light"] #controlModeBanner button {
  color: var(--text-dim);
}

[data-theme="light"] #controlModeBanner button:hover {
  color: #1e293b;
}

[data-theme="light"] #controlModeBanner button.active {
  background: linear-gradient(135deg, var(--cyan) 0%, #0284c7 100%);
  color: #ffffff;
  box-shadow: 0 2px 8px var(--cyan-glow);
}

[data-theme="light"] .axis-legend {
  background: rgba(255, 255, 255, 0.82);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  color: var(--text-dim);
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
}

[data-theme="light"] .axis-legend .hint {
  color: var(--text-muted);
  border-top: 1px solid var(--glass-border);
}

[data-theme="light"] #replayControls {
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--glass-border);
  color: #1e293b;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

[data-theme="light"] button.undo-btn {
  background: rgba(139, 92, 246, 0.08);
  border: 1px solid rgba(139, 92, 246, 0.3);
  color: #7c3aed;
}

[data-theme="light"] button.undo-btn:not(:disabled):hover,
[data-theme="light"] button.undo-btn:not(:disabled):active {
  background: linear-gradient(135deg, var(--purple) 0%, #7c3aed 100%);
  color: #ffffff;
  box-shadow: 0 2px 10px var(--purple-glow);
}

[data-theme="light"] button.reset {
  background: rgba(244, 63, 94, 0.06);
  border: 1px solid rgba(244, 63, 94, 0.25);
  color: #e11d48;
}

[data-theme="light"] button.reset:hover,
[data-theme="light"] button.reset:active {
  background: linear-gradient(135deg, var(--rose) 0%, #e11d48 100%);
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(244, 63, 94, 0.3);
}

[data-theme="light"] .tool-controls {
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid var(--glass-border);
}

[data-theme="light"] select.themepicker option {
  background: #ffffff;
  color: #1e293b;
}

[data-theme="light"] .doc-container {
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-card);
}

[data-theme="light"] .doc-header h1 {
  color: #1e293b;
}

[data-theme="light"] .doc-header p {
  color: var(--text-dim);
}

[data-theme="light"] .doc-section h2 {
  color: #1e293b;
  border-bottom: 1px solid var(--glass-border);
}

[data-theme="light"] .doc-section h3 {
  color: #334155;
}

[data-theme="light"] .doc-section p,
[data-theme="light"] .doc-section li {
  color: #475569;
}

[data-theme="light"] .tip-box {
  background: rgba(14, 165, 233, 0.06);
  border-left: 4px solid var(--cyan);
  color: #334155;
}

/* ==========================================================================
   Interactive 2x2x2 Tutorial Page Styles
   ========================================================================== */
.tut-page-container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.tut-header {
  text-align: center;
  margin-bottom: 28px;
}

.tut-header .hero-badge {
  margin-bottom: 12px;
}

.tut-header h1 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}

.tut-header h1 span {
  background: linear-gradient(135deg, var(--cyan) 0%, var(--purple) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tut-header p {
  color: var(--text-dim);
  font-size: 15px;
  max-width: 680px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Step Navigation Tabs */
.tut-step-tabs {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.tut-step-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 14px;
  background: rgba(18, 26, 44, 0.6);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  color: var(--text-dim);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  touch-action: manipulation;
}

.tut-step-tab:hover {
  border-color: var(--glass-border-light);
  color: #fff;
  transform: translateY(-2px);
}

.tut-step-tab.active {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2) 0%, rgba(168, 85, 247, 0.2) 100%);
  border-color: var(--cyan);
  color: #fff;
  box-shadow: 0 4px 18px rgba(56, 189, 248, 0.25);
}

.tut-step-tab.completed {
  border-color: rgba(52, 211, 153, 0.5);
  color: #34d399;
}

/* Main Tutorial Interactive Grid */
.tut-interactive-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: stretch;
}

@media (min-width: 860px) {
  .tut-interactive-grid {
    grid-template-columns: 1.15fr 1fr;
  }
}

/* 3D Canvas Box */
.tut-canvas-card {
  background: rgba(12, 18, 32, 0.65);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.tut-stage-wrapper {
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 420px;
  border-radius: 18px;
  background: radial-gradient(circle at center, rgba(30, 41, 59, 0.4) 0%, rgba(15, 23, 42, 0.8) 100%);
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.5);
}

.tut-stage-wrapper canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
  touch-action: none;
}

.tut-canvas-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 10px;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 700;
  color: var(--cyan);
  pointer-events: none;
  font-family: var(--font-display);
}

.tut-mode-toggle-bar {
  display: flex;
  gap: 8px;
  width: 100%;
  max-width: 420px;
  margin-top: 14px;
}

.tut-mode-toggle-btn {
  flex: 1;
  padding: 10px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  color: var(--text-dim);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-display);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  touch-action: manipulation;
}

.tut-mode-toggle-btn.active {
  background: rgba(56, 189, 248, 0.2);
  border-color: var(--cyan);
  color: #fff;
}

/* Direction Control Pad in Tutorial */
.tut-dpad-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  width: 100%;
  max-width: 380px;
  margin-top: 10px;
}

.tut-dpad-row {
  display: flex;
  justify-content: center;
  gap: 6px;
  width: 100%;
}

.tut-dir-btn {
  flex: 1;
  max-width: 70px;
  height: 40px;
  padding: 0;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--glass-border);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
  touch-action: manipulation;
}

.tut-dir-btn:hover, .tut-dir-btn:active {
  background: rgba(56, 189, 248, 0.25);
  border-color: var(--cyan);
  transform: translateY(-1px);
}

.tut-dir-btn.z-btn {
  max-width: 90px;
  font-size: 12px;
  background: rgba(168, 85, 247, 0.12);
  border-color: rgba(168, 85, 247, 0.35);
  color: #c084fc;
}

.tut-dir-btn.z-btn:hover, .tut-dir-btn.z-btn:active {
  background: rgba(168, 85, 247, 0.28);
  border-color: #c084fc;
}

[data-theme="light"] .tut-dir-btn {
  background: rgba(255, 255, 255, 0.9);
  color: #1e293b;
  border-color: var(--glass-border);
}

[data-theme="light"] .tut-dir-btn.z-btn {
  background: rgba(168, 85, 247, 0.08);
  color: #7e22ce;
}

/* Tutorial Information & Mission Card */
.tut-info-card {
  background: rgba(18, 26, 44, 0.6);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-card);
}

.tut-step-indicator {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: 20px;
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: var(--cyan);
  margin-bottom: 12px;
}

.tut-step-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  margin: 0 0 12px;
  line-height: 1.35;
}

.tut-step-desc {
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.65;
  margin: 0 0 20px;
}

.tut-mission-box {
  background: rgba(15, 23, 42, 0.6);
  border: 1px dashed rgba(56, 189, 248, 0.4);
  border-radius: 16px;
  padding: 16px 18px;
  margin-bottom: 20px;
}

.tut-mission-box.completed {
  border-style: solid;
  border-color: rgba(52, 211, 153, 0.6);
  background: rgba(16, 185, 129, 0.1);
}

.tut-mission-label {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--cyan);
  font-family: var(--font-display);
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.tut-mission-box.completed .tut-mission-label {
  color: #34d399;
}

.tut-mission-text {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  line-height: 1.45;
  margin: 0;
}

.tut-success-msg {
  display: none;
  font-size: 13px;
  font-weight: 600;
  color: #34d399;
  margin-top: 10px;
  line-height: 1.4;
}

.tut-mission-box.completed .tut-success-msg {
  display: block;
}

/* Tutorial Action Buttons */
.tut-action-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
}

.btn-tut-primary {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
  padding: 14px 20px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--cyan) 0%, #0284c7 100%);
  border: none;
  color: #fff;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 4px 16px var(--cyan-glow);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  touch-action: manipulation;
}

.btn-tut-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.45);
}

.btn-tut-secondary {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  padding: 12px 18px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--glass-border);
  color: var(--text-dim);
  cursor: pointer;
  text-align: center;
  transition: all 0.2s ease;
  touch-action: manipulation;
}

.btn-tut-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-color: var(--glass-border-light);
}

/* Light Theme support for Tutorial */
[data-theme="light"] .tut-header h1 {
  color: #1e293b;
}

[data-theme="light"] .tut-step-tab {
  background: rgba(255, 255, 255, 0.7);
  color: #64748b;
  border-color: var(--glass-border);
}

[data-theme="light"] .tut-step-tab.active {
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.15) 0%, rgba(168, 85, 247, 0.15) 100%);
  color: var(--cyan);
  border-color: var(--cyan);
}

[data-theme="light"] .tut-canvas-card,
[data-theme="light"] .tut-info-card {
  background: rgba(255, 255, 255, 0.75);
  border-color: var(--glass-border);
  box-shadow: var(--shadow-card);
}

[data-theme="light"] .tut-step-title {
  color: #1e293b;
}

[data-theme="light"] .tut-stage-wrapper {
  background: radial-gradient(circle at center, #f1f5f9 0%, #e2e8f0 100%);
}

[data-theme="light"] .tut-mission-box {
  background: rgba(248, 250, 252, 0.85);
  border-color: rgba(14, 165, 233, 0.4);
}

[data-theme="light"] .tut-mission-text {
  color: #1e293b;
}