/* 2048 Tactile - Modern-Tactile Hybrid Design System */
@import url('https://fonts.googleapis.com/css2?family=Hanken+Grotesk:wght@400;600;700&family=JetBrains+Mono:wght@600;700&family=Sora:wght@700;800&family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200&display=swap');

:root {
  /* Default Design System Tokens (Grid Logic Dark / OLED) */
  --bg-color: #141218;
  --on-bg-color: #e6e0e9;
  --surface: #1d1b20;
  --surface-container: #211f24;
  --surface-container-high: #2b292f;
  --surface-container-highest: #36343a;
  --board-bg: #1d1b20;
  --cell-empty: #2b292f;
  --text-main: #e6e0e9;
  --text-dim: #cbc4d2;
  --primary: #cfbcff;
  --on-primary: #381e72;
  --primary-container: #6750a4;
  --on-primary-container: #e0d2ff;
  --secondary: #cdc0e9;
  --secondary-container: #4d4465;
  --on-secondary-container: #bfb2da;
  --tertiary: #e7c365;
  --on-tertiary: #3e2e00;
  --outline: #948e9c;
  --outline-variant: #494551;
  --shadow-tactile: 0px 4px 10px rgba(0, 0, 0, 0.35);
  --shadow-tactile-inset: inset 0px 4px 12px rgba(0, 0, 0, 0.4);
  --btn-shadow: 0px 2px 0px rgba(0, 0, 0, 0.4);
  --bottom-bar-bg: rgba(33, 31, 36, 0.95);

  /* Fonts */
  --font-tile: 'Sora', sans-serif;
  --font-title: 'Sora', sans-serif;
  --font-score-label: 'JetBrains Mono', monospace;
  --font-score-val: 'Sora', sans-serif;
  --font-ui: 'Hanken Grotesk', sans-serif;

  /* Tile Colors Default (Dark / Logic) */
  --t2-bg: #2b292f; --t2-color: #e6e0e9;
  --t4-bg: #36343a; --t4-color: #e6e0e9;
  --t8-bg: #4d4465; --t8-color: #e0d2ff;
  --t16-bg: #6750a4; --t16-color: #ffffff;
  --t32-bg: #7c3aed; --t32-color: #ffffff;
  --t64-bg: #9333ea; --t64-color: #ffffff;
  --t128-bg: #c9a74d; --t128-color: #241a00;
  --t256-bg: #e7c365; --t256-color: #241a00;
  --t512-bg: #ffdf93; --t512-color: #241a00;
  --t1024-bg: #e9ddff; --t1024-color: #22005d;
  --t2048-bg: #cfbcff; --t2048-color: #22005d;
  --tsuper-bg: #f43f5e; --tsuper-color: #ffffff;
}

/* Theme: Forest Fresh (From Render Mocks) */
[data-theme="forest"] {
  --bg-color: #E8F0E5;
  --on-bg-color: #4A5D45;
  --surface: #C6D5C0;
  --surface-container: rgba(198, 213, 192, 0.7);
  --surface-container-high: #b8cbb1;
  --surface-container-highest: #a9bda1;
  --board-bg: #C6D5C0;
  --cell-empty: #A9BDA1;
  --text-main: #4A5D45;
  --text-dim: #60755b;
  --primary: #4A5D45;
  --on-primary: #ffffff;
  --primary-container: rgba(74, 93, 69, 0.2);
  --on-primary-container: #4A5D45;
  --secondary: #60755b;
  --secondary-container: #d2dfcd;
  --on-secondary-container: #334330;
  --tertiary: #E6B022;
  --on-tertiary: #ffffff;
  --shadow-tactile: 0px 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-tactile-inset: inset 0px 4px 8px rgba(0, 0, 0, 0.12);
  --btn-shadow: 0px 2px 0px rgba(74, 93, 69, 0.25);
  --bottom-bar-bg: rgba(198, 213, 192, 0.95);

  --t2-bg: #EAE7D6; --t2-color: #4A5D45;
  --t4-bg: #E1DFCA; --t4-color: #4A5D45;
  --t8-bg: #E4B68D; --t8-color: #ffffff;
  --t16-bg: #E4966B; --t16-color: #ffffff;
  --t32-bg: #D67A62; --t32-color: #ffffff;
  --t64-bg: #C65C47; --t64-color: #ffffff;
  --t128-bg: #ECD581; --t128-color: #4A5D45;
  --t256-bg: #EDCC61; --t256-color: #ffffff;
  --t512-bg: #EAC250; --t512-color: #ffffff;
  --t1024-bg: #E9B838; --t1024-color: #ffffff;
  --t2048-bg: #E6B022; --t2048-color: #ffffff;
  --tsuper-bg: #32472F; --tsuper-color: #ffffff;
}

/* Theme: Pastel Dream (From Render Mocks) */
[data-theme="pastel"] {
  --bg-color: #e6dfff;
  --on-bg-color: #342b4b;
  --surface: #d8cefa;
  --surface-container: rgba(255, 255, 255, 0.45);
  --surface-container-high: #cdc0e9;
  --surface-container-highest: #bfb2da;
  --board-bg: rgba(42, 36, 56, 0.2);
  --cell-empty: rgba(255, 255, 255, 0.35);
  --text-main: #342b4b;
  --text-dim: #6b5e87;
  --primary: #6750a4;
  --on-primary: #ffffff;
  --primary-container: rgba(103, 80, 164, 0.15);
  --on-primary-container: #381e72;
  --secondary: #a1c6ea;
  --secondary-container: #d8cefa;
  --on-secondary-container: #22005d;
  --tertiary: #ffdf93;
  --on-tertiary: #503d00;
  --shadow-tactile: 0px 4px 10px rgba(52, 43, 75, 0.08);
  --shadow-tactile-inset: inset 0 4px 12px rgba(52, 43, 75, 0.12);
  --btn-shadow: 0px 2px 0px rgba(52, 43, 75, 0.15);
  --bottom-bar-bg: rgba(230, 223, 255, 0.95);

  --t2-bg: #ffdab9; --t2-color: #503d00;
  --t4-bg: #ffd1a4; --t4-color: #503d00;
  --t8-bg: #bdf6e4; --t8-color: #1f1635;
  --t16-bg: #a4efd8; --t16-color: #1f1635;
  --t32-bg: #a1c6ea; --t32-color: #22005d;
  --t64-bg: #8bb8e4; --t64-color: #22005d;
  --t128-bg: #ffdf93; --t128-color: #503d00;
  --t256-bg: #fcd5ce; --t256-color: #503d00;
  --t512-bg: #f8ad9d; --t512-color: #ffffff;
  --t1024-bg: #f4978e; --t1024-color: #ffffff;
  --t2048-bg: #b56576; --t2048-color: #ffffff;
  --tsuper-bg: #6d597a; --tsuper-color: #ffffff;
}

/* Theme: Classic Warm */
[data-theme="classic"] {
  --bg-color: #faf8ef;
  --on-bg-color: #776e65;
  --surface: #bbada0;
  --surface-container: rgba(187, 173, 160, 0.4);
  --surface-container-high: #b0a092;
  --surface-container-highest: #a59384;
  --board-bg: #bbada0;
  --cell-empty: rgba(238, 228, 218, 0.4);
  --text-main: #776e65;
  --text-dim: #8f7a66;
  --primary: #8f7a66;
  --on-primary: #ffffff;
  --primary-container: rgba(143, 122, 102, 0.2);
  --on-primary-container: #5d4f42;
  --secondary: #edc22e;
  --secondary-container: #ede0c8;
  --on-secondary-container: #776e65;
  --tertiary: #f65e3b;
  --on-tertiary: #ffffff;
  --shadow-tactile: 0px 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-tactile-inset: inset 0px 4px 10px rgba(0, 0, 0, 0.14);
  --btn-shadow: 0px 2px 0px rgba(119, 110, 101, 0.25);
  --bottom-bar-bg: rgba(250, 248, 239, 0.95);

  --t2-bg: #eee4da; --t2-color: #776e65;
  --t4-bg: #ede0c8; --t4-color: #776e65;
  --t8-bg: #f2b179; --t8-color: #ffffff;
  --t16-bg: #f59563; --t16-color: #ffffff;
  --t32-bg: #f67c5f; --t32-color: #ffffff;
  --t64-bg: #f65e3b; --t64-color: #ffffff;
  --t128-bg: #edcf72; --t128-color: #ffffff;
  --t256-bg: #edcc61; --t256-color: #ffffff;
  --t512-bg: #edc850; --t512-color: #ffffff;
  --t1024-bg: #edc53f; --t1024-color: #ffffff;
  --t2048-bg: #edc22e; --t2048-color: #ffffff;
  --tsuper-bg: #3c3a32; --tsuper-color: #ffffff;
}

/* Theme: Cyberpunk Neon */
[data-theme="cyberpunk"] {
  --bg-color: #0b091a;
  --on-bg-color: #00f0ff;
  --surface: #191438;
  --surface-container: rgba(25, 20, 56, 0.7);
  --surface-container-high: #241c52;
  --surface-container-highest: #31266e;
  --board-bg: #191438;
  --cell-empty: rgba(0, 240, 255, 0.07);
  --text-main: #00f0ff;
  --text-dim: #ff007f;
  --primary: #ff007f;
  --on-primary: #ffffff;
  --primary-container: rgba(255, 0, 127, 0.2);
  --on-primary-container: #00f0ff;
  --secondary: #00f0ff;
  --secondary-container: #241c52;
  --on-secondary-container: #ffffff;
  --tertiary: #ffe600;
  --on-tertiary: #0b091a;
  --shadow-tactile: 0 0 16px rgba(0, 240, 255, 0.2);
  --shadow-tactile-inset: inset 0 0 16px rgba(255, 0, 127, 0.25);
  --btn-shadow: 0 2px 0 #ff007f;
  --bottom-bar-bg: rgba(11, 9, 26, 0.95);

  --t2-bg: #1e1847; --t2-color: #00f0ff;
  --t4-bg: #2d2468; --t4-color: #00f0ff;
  --t8-bg: #7928ca; --t8-color: #ffffff;
  --t16-bg: #ff0080; --t16-color: #ffffff;
  --t32-bg: #ff4d4d; --t32-color: #ffffff;
  --t64-bg: #ff9900; --t64-color: #ffffff;
  --t128-bg: #00f0ff; --t128-color: #0b091a;
  --t256-bg: #00ff88; --t256-color: #0b091a;
  --t512-bg: #ffff00; --t512-color: #0b091a;
  --t1024-bg: #ff0055; --t1024-color: #ffffff;
  --t2048-bg: #7928ca; --t2048-color: #ffffff;
  --tsuper-bg: #ff00ff; --tsuper-color: #ffffff;
}

/* Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-ui);
  background-color: var(--bg-color);
  color: var(--on-bg-color);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  transition: background-color 0.25s ease, color 0.25s ease;
  overflow-x: hidden;
  padding-bottom: 90px;
}

.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  vertical-align: middle;
  line-height: 1;
}

/* App Header / TopAppBar */
.top-app-bar {
  width: 100%;
  max-width: 500px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 16px 8px;
  z-index: 20;
}

.app-title {
  font-family: var(--font-title);
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--primary);
  line-height: 1;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.icon-btn {
  background: transparent;
  color: var(--primary);
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 9999px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.15s, transform 0.1s;
}

.icon-btn:hover {
  background: var(--primary-container);
}

.icon-btn:active {
  transform: scale(0.92);
}

/* Main Container */
.main-content {
  width: 100%;
  max-width: 500px;
  padding: 0 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin-top: 4px;
}

/* Score Section */
.score-board {
  display: flex;
  gap: 12px;
  width: 100%;
  justify-content: space-between;
}

.score-card {
  flex: 1;
  background: var(--surface-container);
  border-radius: 12px;
  padding: 8px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-tactile);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.score-label {
  font-family: var(--font-score-label);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.score-val {
  font-family: var(--font-score-val);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
}

.score-addition {
  position: absolute;
  top: 2px;
  right: 12px;
  font-family: var(--font-score-val);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--tertiary);
  animation: floatScore 0.75s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
  pointer-events: none;
}

@keyframes floatScore {
  0% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(-24px); }
}

/* Secondary Info Bar (Moves / Grid Size / Timer) */
.sub-status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 0 4px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dim);
}

.badge-chip {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--surface-container);
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 700;
}

/* Board Wrapper */
.board-container {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  background: var(--board-bg);
  border-radius: 16px;
  padding: 12px;
  box-shadow: var(--shadow-tactile-inset);
  touch-action: none;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.grid-matrix {
  display: grid;
  width: 100%;
  height: 100%;
  gap: 12px;
}

.grid-slot {
  background: var(--cell-empty);
  border-radius: 8px;
  width: 100%;
  height: 100%;
}

/* Tile Layer */
.tile-layer {
  position: absolute;
  top: 12px;
  left: 12px;
  right: 12px;
  bottom: 12px;
  pointer-events: none;
}

.tile {
  position: absolute;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-tactile);
  transition: transform 110ms cubic-bezier(0.2, 0, 0, 1);
  will-change: transform;
}

.tile .tile-inner {
  width: 100%;
  height: 100%;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-tile);
  font-weight: 800;
  line-height: 1;
  text-align: center;
}

/* Dynamic Tile Appearance / Merging Animations */
.tile-appear .tile-inner {
  animation: tileSpawn 180ms cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes tileSpawn {
  0% { transform: scale(0); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.tile-pop .tile-inner {
  animation: tileMergePop 200ms ease-in-out forwards;
}

@keyframes tileMergePop {
  0% { transform: scale(0.9); }
  50% { transform: scale(1.16); }
  100% { transform: scale(1); }
}

/* Tile Color Rules */
.tile-2 .tile-inner { background: var(--t2-bg); color: var(--t2-color); font-size: 2.3rem; }
.tile-4 .tile-inner { background: var(--t4-bg); color: var(--t4-color); font-size: 2.3rem; }
.tile-8 .tile-inner { background: var(--t8-bg); color: var(--t8-color); font-size: 2.3rem; }
.tile-16 .tile-inner { background: var(--t16-bg); color: var(--t16-color); font-size: 2.1rem; }
.tile-32 .tile-inner { background: var(--t32-bg); color: var(--t32-color); font-size: 2.1rem; }
.tile-64 .tile-inner { background: var(--t64-bg); color: var(--t64-color); font-size: 2.1rem; }
.tile-128 .tile-inner { background: var(--t128-bg); color: var(--t128-color); font-size: 1.8rem; }
.tile-256 .tile-inner { background: var(--t256-bg); color: var(--t256-color); font-size: 1.8rem; }
.tile-512 .tile-inner { background: var(--t512-bg); color: var(--t512-color); font-size: 1.8rem; }
.tile-1024 .tile-inner { background: var(--t1024-bg); color: var(--t1024-color); font-size: 1.45rem; }
.tile-2048 .tile-inner { background: var(--t2048-bg); color: var(--t2048-color); font-size: 1.45rem; }
.tile-4096 .tile-inner,
.tile-8192 .tile-inner,
.tile-16384 .tile-inner,
.tile-32768 .tile-inner,
.tile-65536 .tile-inner,
.tile-131072 .tile-inner {
  background: var(--tsuper-bg);
  color: var(--tsuper-color);
  font-size: 1.25rem;
}

/* Grids Font Scaling */
.grid-size-3 .tile .tile-inner { font-size: 2.7rem; }
.grid-size-3 .tile-1024 .tile-inner, .grid-size-3 .tile-2048 .tile-inner { font-size: 1.8rem; }

.grid-size-5 .tile .tile-inner { font-size: 1.6rem; }
.grid-size-5 .tile-128 .tile-inner, .grid-size-5 .tile-256 .tile-inner, .grid-size-5 .tile-512 .tile-inner { font-size: 1.3rem; }
.grid-size-5 .tile-1024 .tile-inner, .grid-size-5 .tile-2048 .tile-inner { font-size: 1.1rem; }

.grid-size-6 .tile .tile-inner { font-size: 1.25rem; }
.grid-size-6 .tile-128 .tile-inner, .grid-size-6 .tile-256 .tile-inner, .grid-size-6 .tile-512 .tile-inner { font-size: 1rem; }
.grid-size-6 .tile-1024 .tile-inner, .grid-size-6 .tile-2048 .tile-inner { font-size: 0.85rem; }

.grid-size-8 .tile .tile-inner { font-size: 0.95rem; }
.grid-size-8 .tile-128 .tile-inner, .grid-size-8 .tile-256 .tile-inner, .grid-size-8 .tile-512 .tile-inner { font-size: 0.75rem; }
.grid-size-8 .tile-1024 .tile-inner, .grid-size-8 .tile-2048 .tile-inner { font-size: 0.65rem; }

/* In-Game Overlay */
.game-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(20, 18, 24, 0.85);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  border-radius: 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  z-index: 40;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

[data-theme="forest"] .game-overlay {
  background: rgba(198, 213, 192, 0.9);
}

[data-theme="pastel"] .game-overlay {
  background: rgba(230, 223, 255, 0.9);
}

[data-theme="classic"] .game-overlay {
  background: rgba(238, 228, 218, 0.92);
}

.game-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.overlay-title {
  font-family: var(--font-title);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  text-align: center;
}

.overlay-msg {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-dim);
  text-align: center;
  max-width: 80%;
}

.overlay-actions {
  display: flex;
  gap: 12px;
}

/* Tactile Control Buttons */
.tactile-btn {
  background: var(--primary);
  color: var(--on-primary);
  border: none;
  padding: 10px 20px;
  border-radius: 12px;
  font-family: var(--font-ui);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--btn-shadow);
  transition: transform 0.1s ease, filter 0.15s;
}

.tactile-btn:hover {
  filter: brightness(1.08);
}

.tactile-btn:active {
  transform: translateY(2px);
  box-shadow: none;
}

.tactile-btn.btn-secondary {
  background: var(--surface-container-high);
  color: var(--text-main);
}

/* Bottom Navigation Bar */
.bottom-nav-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 50;
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 8px 16px;
  padding-bottom: calc(8px + env(safe-area-inset-bottom));
  background: var(--bottom-bar-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.15);
}

.nav-tab-btn {
  background: transparent;
  color: var(--text-dim);
  border: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6px 14px;
  border-radius: 12px;
  cursor: pointer;
  gap: 3px;
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 600;
  transition: color 0.15s, background-color 0.15s, transform 0.1s;
}

.nav-tab-btn:hover {
  background: var(--primary-container);
  color: var(--text-main);
}

.nav-tab-btn:active {
  transform: scale(0.94);
}

.nav-tab-btn.active {
  background: var(--primary-container);
  color: var(--on-primary-container);
}

.nav-tab-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

/* Modals & Drawers */
.modal-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  z-index: 100;
}

.modal-layer.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--surface-container);
  color: var(--text-main);
  border-radius: 20px;
  padding: 24px;
  width: 100%;
  max-width: 440px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transform: translateY(24px);
  transition: transform 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  border: 1px solid rgba(255, 255, 255, 0.08);
  max-height: 85vh;
  overflow-y: auto;
}

.modal-layer.active .modal-card {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-title {
  font-family: var(--font-title);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Theme Option Cards */
.theme-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.theme-card-btn {
  background: var(--surface-container-high);
  border: 2px solid transparent;
  border-radius: 12px;
  padding: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  color: var(--text-main);
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 0.88rem;
  transition: border-color 0.2s, transform 0.1s;
}

.theme-card-btn:hover {
  filter: brightness(1.1);
}

.theme-card-btn.selected {
  border-color: var(--primary);
  background: var(--primary-container);
}

.theme-swatch {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  flex-shrink: 0;
}

/* Grid & Mode Selector Chips */
.chip-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.chip-btn {
  background: var(--surface-container-high);
  color: var(--text-main);
  border: 2px solid transparent;
  padding: 10px 8px;
  border-radius: 10px;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 700;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s;
}

.chip-btn.selected {
  border-color: var(--primary);
  background: var(--primary-container);
  color: var(--on-primary-container);
}

/* Stats Matrix */
.stats-tiles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.stat-box {
  background: var(--surface-container-high);
  padding: 14px 10px;
  border-radius: 12px;
  text-align: center;
}

.stat-number {
  font-family: var(--font-score-val);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
}

.stat-desc {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 2px;
}

/* Onboarding Overlay Styles */
.onboarding-layer {
  z-index: 150;
}

.onboarding-card {
  max-width: 480px;
  background: var(--surface-container);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.onboarding-subtitle {
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--text-dim);
  text-align: center;
  margin-top: -6px;
}

.onboarding-steps-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  background: var(--surface-container-high);
  padding: 18px 8px 14px;
  border-radius: 16px;
  box-shadow: var(--shadow-tactile-inset);
  margin: 4px 0;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.onboarding-step {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  min-width: 0;
}

.step-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: var(--on-primary);
  width: 22px;
  height: 22px;
  border-radius: 9999px;
  font-family: var(--font-score-val);
  font-size: 12px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
  z-index: 2;
}

.step-icon-box {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: var(--surface-container);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 4px;
  margin-bottom: 8px;
  box-shadow: var(--shadow-tactile);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.step-icon-box .material-symbols-outlined {
  font-size: 24px;
}

.step-title {
  font-family: var(--font-title);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 3px;
  white-space: nowrap;
}

.step-desc {
  font-size: 0.7rem;
  line-height: 1.35;
  color: var(--text-dim);
}

.step-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  opacity: 0.75;
  flex-shrink: 0;
  transform: translateY(-8px);
}

.step-arrow .material-symbols-outlined {
  font-size: 20px;
}

.onboarding-footer {
  margin-top: 4px;
}

/* Confetti Canvas */
#confettiCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 200;
}

/* Responsive tweaks */
@media (max-width: 420px) {
  .onboarding-steps-container {
    gap: 2px;
    padding: 16px 4px 10px;
  }
  .step-icon-box {
    width: 38px;
    height: 38px;
    border-radius: 10px;
  }
  .step-icon-box .material-symbols-outlined {
    font-size: 20px;
  }
  .step-title {
    font-size: 0.74rem;
  }
  .step-desc {
    font-size: 0.65rem;
  }
  .step-arrow .material-symbols-outlined {
    font-size: 16px;
  }
}

@media (min-width: 768px) {
  .top-app-bar {
    padding-top: 24px;
  }
}