:root {
  color-scheme: dark;
  --bg: #080d19;
  --surface: #11182a;
  --surface-2: #182238;
  --ink: #f8f9ff;
  --muted: #8d98ae;
  --line: rgba(255, 255, 255, .09);
  --lime: #c9f45b;
  --purple: #8b7cff;
  --coral: #ff725e;
  --cyan: #67e8d2;
  --yellow: #ffc857;
  --shadow: 0 22px 60px rgba(0, 0, 0, .28);
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 78% 5%, rgba(139,124,255,.1), transparent 28rem),
    var(--bg);
  color: var(--ink);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}
button, input { font: inherit; }
button { color: inherit; }
[hidden] { display: none !important; }

.app-shell { min-height: 100vh; }
.lobby-header { display:flex; align-items:center; min-height:48px; padding-bottom:22px; border-bottom:1px solid var(--line); }
.brand {
  display: flex; align-items: center; gap: 12px; color: inherit;
  text-decoration: none; font-size: 17px; font-weight: 850; letter-spacing: .3px;
}
.brand-mark {
  width: 30px; height: 30px; display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 3px; padding: 3px; border-radius: 9px; background: var(--lime);
  box-shadow: 0 0 24px rgba(201,244,91,.22);
}
.brand-mark i { display: block; border-radius: 2px; background: #0d1524; }
.brand-mark i:nth-child(2), .brand-mark i:nth-child(3) { opacity: .55; }
.main-content { min-width: 0; padding: 30px clamp(26px,6vw,92px) 76px; }
.lobby, .game-view { width: min(1160px,100%); margin: 0 auto; }
.eyebrow { margin: 0 0 10px; color: var(--lime); font-size: 10px; font-weight: 900; letter-spacing: 2px; }
h1, h2, p { margin-top: 0; }

.section-heading { display: flex; align-items: flex-end; justify-content: space-between; margin: 34px 0 20px; }
.section-heading .eyebrow { margin-bottom: 7px; }
.section-heading h2 { margin-bottom: 5px; font-size: 24px; letter-spacing: -.5px; }
.section-heading p, .keyboard-hint { margin:0; color:var(--muted); font-size:11px; }
.game-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:18px; }
.game-card {
  position: relative; min-height: 244px; display:flex; flex-direction:column; padding:0; overflow:hidden;
  border:1px solid var(--line); border-radius:18px; background:var(--surface); text-align:left;
  cursor:pointer; transition:transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.game-card:hover { transform:translateY(-5px); border-color:rgba(201,244,91,.42); box-shadow:var(--shadow); }
.card-preview { position:relative; min-height:130px; display:grid; place-items:center; overflow:hidden; }
.preview-2048 { grid-template-columns:repeat(4,48px); align-content:center; justify-content:center; gap:6px; background:#322d45; }
.preview-2048 i {
  width:48px; height:48px; display:grid; place-items:center; border-radius:10px;
  background:#f3eedb; color:#4a4050; font-style:normal; font-weight:950;
}
.preview-2048 i:nth-child(2){background:var(--yellow)} .preview-2048 i:nth-child(3){background:#ff9a6f}
.preview-2048 i:last-child{background:var(--coral);color:white}
.preview-mine { background:#263850; }
.preview-mine::before {
  content:""; width:190px; height:90px; border-radius:10px; transform:rotate(-4deg);
  background-image:linear-gradient(rgba(255,255,255,.12) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.12) 1px,transparent 1px);
  background-size:30px 30px; border:1px solid rgba(255,255,255,.1);
}
.preview-mine::after { content:""; position:absolute; width:52px; height:52px; background:var(--cyan); clip-path:polygon(50% 0,60% 38%,100% 50%,60% 62%,50% 100%,40% 62%,0 50%,40% 38%); filter:drop-shadow(0 0 12px rgba(103,232,210,.5)); }
.preview-snake { background:#203a35; }
.preview-snake::before {
  content:""; width:148px; height:20px; border-radius:7px; background:var(--lime);
  box-shadow:24px 24px 0 var(--lime),48px 48px 0 var(--lime); transform:translate(-23px,-23px);
}
.preview-snake::after {
  content:""; position:absolute; width:18px; height:18px; border-radius:50%;
  background:var(--coral); transform:translate(92px,-31px); box-shadow:0 0 18px rgba(255,114,94,.5);
}
.preview-memory { grid-template-columns:repeat(4,45px); align-content:center; justify-content:center; gap:7px; background:#302d50; }
.preview-memory i {
  width:45px; height:58px; display:grid; place-items:center; border:1px solid rgba(255,255,255,.15);
  border-radius:9px; background:#8878f4; color:#fff; font-style:normal; font-size:20px; font-weight:900;
}
.preview-memory i:nth-child(1),.preview-memory i:nth-child(4){background:#fff;color:var(--purple)}
.card-copy { display:flex; flex-direction:column; min-width:0; padding:18px 20px 19px; }
.card-copy small { color:var(--lime); font-size:10px; font-weight:850; letter-spacing:.5px; }
.card-copy h3 { margin:6px 0 4px; font-size:22px; }
.card-copy p { margin-bottom:14px; color:var(--muted); font-size:12px; line-height:1.55; }
.card-meta { display:block; margin-top:auto; color:#7d889f; font-size:10px; }
.empty-state { padding:60px 20px; border:1px dashed var(--line); border-radius:16px; text-align:center; }
.empty-state p { margin:6px 0 0; color:var(--muted); }

.game-toolbar {
  min-height:78px; display:grid; grid-template-columns:44px 1fr auto; align-items:center;
  gap:16px; padding-bottom:18px; border-bottom:1px solid var(--line);
}
.game-toolbar h1 { margin:0; font-size:30px; letter-spacing:-.7px; }
.game-toolbar .eyebrow { margin-bottom:5px; }
.icon-button,.secondary-button {
  height:40px; border:1px solid var(--line); border-radius:10px; background:var(--surface); cursor:pointer;
}
.icon-button { width:40px; font-size:20px; }
.icon-button:hover,.secondary-button:hover { border-color:var(--lime); color:var(--lime); }
.secondary-button { padding:0 15px; font-size:12px; font-weight:800; }
.toolbar-actions { display:flex; gap:8px; }
.game-stage { min-height:calc(100vh - 180px); display:grid; place-items:center; padding:34px 0; }
.game-layout {
  width:min(980px,100%); display:grid; grid-template-columns:minmax(300px,680px) 240px;
  align-items:start; justify-content:center; gap:34px;
}
.game-panel { min-width:0; }
.score-row { display:flex; flex-wrap:wrap; align-items:stretch; gap:9px; margin-bottom:14px; }
.score-box {
  min-width:102px; padding:10px 14px; border:1px solid var(--line); border-radius:11px; background:var(--surface);
}
.score-box small,.score-box strong { display:block; }
.score-box small { color:var(--muted); font-size:9px; letter-spacing:.4px; }
.score-box strong { margin-top:3px; font-size:21px; }
.difficulty-switch {
  display:inline-flex; gap:4px; margin-left:auto; padding:4px; border:1px solid var(--line);
  border-radius:11px; background:var(--surface);
}
.difficulty-switch button {
  min-width:58px; padding:0 10px; border:0; border-radius:7px; background:transparent;
  color:var(--muted); font-size:11px; font-weight:750; cursor:pointer;
}
.difficulty-switch button:hover { color:#fff; }
.difficulty-switch button.active { background:var(--lime); color:#111827; }
.game-help { padding:21px; border:1px solid var(--line); border-radius:14px; background:rgba(255,255,255,.025); }
.game-help h2 { font-size:17px; }
.game-help p,.game-help li { color:var(--muted); font-size:12px; line-height:1.75; }
.game-help ul { padding-left:17px; }
.status-line { min-height:24px; margin:12px 0 0; color:var(--lime); font-size:12px; font-weight:800; }

.board-2048 {
  width:min(100%,520px); aspect-ratio:1; display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); grid-template-rows:repeat(4,minmax(0,1fr)); gap:9px;
  padding:9px; border-radius:14px; background:#443c54; touch-action:none;
}
.tile-2048 { width:100%; height:100%; display:grid; place-items:center; min-width:0; min-height:0; line-height:1; border-radius:10px; background:#5b526b; color:#fff; font-size:clamp(20px,6vw,42px); font-weight:950; }
.tile-2048[data-value="2"]{background:#f5f1df;color:#51495d}.tile-2048[data-value="4"]{background:#ffe29a;color:#51495d}
.tile-2048[data-value="8"]{background:#ffb876;color:#4b3340}.tile-2048[data-value="16"]{background:#ff916d}
.tile-2048[data-value="32"]{background:#ff725e}.tile-2048[data-value="64"]{background:#ed4b6a}
.tile-2048[data-value="128"],.tile-2048[data-value="256"]{background:#9a7cf8;font-size:clamp(18px,5vw,34px)}
.tile-2048[data-value="512"],.tile-2048[data-value="1024"],.tile-2048[data-value="2048"]{background:var(--lime);color:#172017;font-size:clamp(16px,4.5vw,30px)}

.mine-board {
  width:min(100%,600px); aspect-ratio:1; display:grid; grid-auto-rows:minmax(0,1fr); gap:2px; padding:6px; border:1px solid #33425c;
  border-radius:14px; background:#202a3d; user-select:none; overflow:hidden;
}
.mine-cell {
  width:100%; height:100%; min-width:0; min-height:0; padding:0; border:0; border-radius:3px; background:#344159;
  color:#f5f7ff; font-size:clamp(7px,1.7vw,16px); line-height:1; font-weight:900; cursor:pointer;
}
.mine-cell:hover { background:#41506b; }
.mine-cell.revealed { background:#171f30; }
.mine-cell.mine { background:#713d49; color:#ff8c7b; }
.mine-cell.flagged { color:var(--yellow); }
.mine-cell[data-count="1"]{color:#6ab7ff}.mine-cell[data-count="2"]{color:#77e0a0}
.mine-cell[data-count="3"]{color:#ff8e78}.mine-cell[data-count="4"]{color:#b69bff}
.mine-cell[data-count="5"]{color:#ff6f9f}.mine-cell[data-count="6"]{color:#64e1d1}
.mine-marker { position:relative; display:inline-block; color:currentColor; }
.mine-flag { width:14px; height:17px; border-left:2px solid currentColor; }
.mine-flag::before { content:""; position:absolute; top:1px; left:0; border-top:4px solid transparent; border-bottom:4px solid transparent; border-left:9px solid currentColor; }
.mine-flag::after { content:""; position:absolute; left:-4px; bottom:0; width:9px; height:2px; border-radius:2px; background:currentColor; }
.mine-bomb { width:12px; height:12px; border-radius:50%; background:currentColor; box-shadow:0 0 0 2px rgba(255,255,255,.12); }
.mine-bomb::before,.mine-bomb::after { content:""; position:absolute; inset:50% auto auto 50%; width:20px; height:2px; border-radius:2px; background:currentColor; transform:translate(-50%,-50%); }
.mine-bomb::after { transform:translate(-50%,-50%) rotate(90deg); }

.snake-panel { width:100%; }
.snake-console {
  width:min(100%,720px); overflow:hidden; border:1px solid rgba(201,244,91,.2); border-radius:22px;
  background:linear-gradient(145deg,#192820,#0c1518); box-shadow:0 26px 70px rgba(0,0,0,.38),inset 0 1px rgba(255,255,255,.05);
}
.snake-console-bar { min-height:70px; display:flex; align-items:center; gap:18px; padding:11px 14px 11px 18px; }
.snake-game-name { display:flex; align-items:center; gap:10px; min-width:0; }
.snake-game-name>i { width:9px; height:9px; flex:0 0 auto; border-radius:50%; background:var(--lime); box-shadow:0 0 14px rgba(201,244,91,.7); }
.snake-game-name span,.snake-game-name small,.snake-game-name strong { display:block; }
.snake-game-name small { margin-bottom:2px; color:#748376; font-size:7px; font-weight:900; letter-spacing:1.4px; }
.snake-game-name strong { color:#efffd0; font-size:12px; letter-spacing:1px; white-space:nowrap; }
.snake-inline-stats { display:flex; gap:5px; margin-left:auto; }
.snake-inline-stats>span { min-width:62px; padding:7px 10px; border:1px solid rgba(255,255,255,.07); border-radius:10px; background:rgba(0,0,0,.18); }
.snake-inline-stats small,.snake-inline-stats strong { display:block; }
.snake-inline-stats small { color:#778479; font-size:7px; }
.snake-inline-stats strong { margin-top:1px; color:#fff; font-size:17px; }
.snake-pause { width:42px; height:42px; flex:0 0 auto; border:1px solid rgba(201,244,91,.2); border-radius:12px; background:rgba(201,244,91,.08); color:var(--lime); font-weight:950; cursor:pointer; }
.snake-pause:hover { background:var(--lime); color:#101814; }
.snake-pause:disabled { cursor:default; opacity:.45; }
.snake-pause-icon { position:relative; display:block; width:12px; height:14px; margin:auto; border-left:4px solid currentColor; border-right:4px solid currentColor; }
.snake-pause.is-paused .snake-pause-icon { width:0; height:0; border-top:7px solid transparent; border-bottom:7px solid transparent; border-left:11px solid currentColor; border-right:0; }
.snake-pause.is-ended .snake-pause-icon { width:15px; height:15px; border:0; }
.snake-pause.is-ended .snake-pause-icon::before,.snake-pause.is-ended .snake-pause-icon::after { content:""; position:absolute; top:6px; left:0; width:15px; height:2px; border-radius:2px; background:currentColor; transform:rotate(45deg); }
.snake-pause.is-ended .snake-pause-icon::after { transform:rotate(-45deg); }
.snake-screen { position:relative; margin:0 14px; overflow:hidden; border:1px solid rgba(201,244,91,.15); border-radius:14px; box-shadow:inset 0 0 30px rgba(0,0,0,.45); }
.snake-screen::after { content:""; position:absolute; inset:0; pointer-events:none; border-radius:inherit; box-shadow:inset 0 0 45px rgba(0,0,0,.34); }
.snake-canvas { width:100%; height:auto; aspect-ratio:8/5; display:block; background:#0f1917; touch-action:none; }
.snake-badge { position:absolute; top:12px; left:12px; z-index:2; padding:7px 10px; border:1px solid rgba(255,255,255,.07); border-radius:99px; background:rgba(5,12,12,.72); color:#d9e6d9; font-size:8px; font-weight:850; backdrop-filter:blur(8px); }
.snake-badge i { width:6px; height:6px; display:inline-block; margin-right:5px; border-radius:50%; background:var(--lime); box-shadow:0 0 8px var(--lime); }
.snake-swipe-hint { position:absolute; right:12px; bottom:11px; z-index:2; padding:6px 9px; border-radius:7px; background:rgba(5,12,12,.6); color:#6f8076; font-size:8px; backdrop-filter:blur(6px); }
.snake-control-bar { min-height:82px; display:flex; align-items:center; justify-content:space-between; gap:14px; padding:12px 18px 14px; }
.snake-control-bar>div:first-child strong,.snake-control-bar>div:first-child small { display:block; }
.snake-control-bar>div:first-child strong { font-size:11px; }
.snake-control-bar>div:first-child small { margin-top:4px; color:#69776e; font-size:8px; }
.touch-pad { display:grid; grid-template-columns:repeat(3,38px); gap:4px; margin:0; }
.touch-pad button { width:38px; height:31px; border:1px solid rgba(255,255,255,.08); border-radius:8px; background:#17231f; color:#9eaca2; font-size:12px; font-weight:900; cursor:pointer; }
.touch-pad button:hover,.touch-pad button:active { border-color:var(--lime); background:var(--lime); color:#121a1d; }
.touch-pad button:nth-child(1){grid-column:2}.touch-pad button:nth-child(2){grid-column:1;grid-row:2}
.touch-pad button:nth-child(3){grid-column:2;grid-row:2}.touch-pad button:nth-child(4){grid-column:3;grid-row:2}

.memory-progress {
  flex:1 1 100%; height:7px; overflow:hidden; border-radius:99px; background:rgba(255,255,255,.07);
}
.memory-progress i { display:block; height:100%; width:0; border-radius:inherit; background:linear-gradient(90deg,var(--purple),var(--cyan)); transition:width .25s ease; }
.memory-board {
  width:min(100%,600px); display:grid; gap:9px; padding:14px; border:1px solid rgba(139,124,255,.2);
  border-radius:18px; background:linear-gradient(145deg,#171b34,#10162a); perspective:900px;
}
.memory-card {
  position:relative; aspect-ratio:.82; min-width:0; padding:0; border:0; border-radius:10px;
  background:transparent; cursor:pointer; transform-style:preserve-3d; transition:transform .36s cubic-bezier(.2,.7,.2,1);
}
.memory-card:hover:not(.flipped):not(.matched) { transform:translateY(-4px); }
.memory-card:hover:not(.flipped):not(.matched) .memory-back { border-color:rgba(201,244,91,.5); box-shadow:0 12px 22px rgba(0,0,0,.28),inset 0 1px rgba(255,255,255,.13); }
.memory-card.flipped,.memory-card.matched { transform:rotateY(180deg); }
.memory-face {
  position:absolute; inset:0; display:grid; place-items:center; border:1px solid var(--line);
  border-radius:10px; backface-visibility:hidden; overflow:hidden;
}
.memory-back {
  background:
    radial-gradient(circle at 18% 8%,rgba(255,255,255,.18),transparent 32%),
    linear-gradient(145deg,#4559bd 0%,#5743a8 56%,#252b50 100%);
  border-color:rgba(153,166,255,.3); box-shadow:inset 0 1px rgba(255,255,255,.1),inset 0 -18px 28px rgba(10,12,37,.2); transition:border-color .2s ease,box-shadow .2s ease;
}
.memory-back::before { content:""; position:absolute; z-index:2; width:25%; aspect-ratio:1; background:var(--lime); clip-path:polygon(50% 0,62% 38%,100% 50%,62% 62%,50% 100%,38% 62%,0 50%,38% 38%); filter:drop-shadow(0 0 10px rgba(201,244,91,.28)); }
.memory-back::after { content:""; position:absolute; inset:8px; border:1px solid rgba(255,255,255,.13); border-radius:7px; background:linear-gradient(135deg,rgba(255,255,255,.05),transparent 42%); }
.memory-front {
  transform:rotateY(180deg); background:linear-gradient(145deg,#ffffff,#eef0fb); color:#3b315f;
  font-size:clamp(17px,3.8vw,34px); font-weight:900;
}
.memory-front::after { content:""; position:absolute; inset:8px; border:1px solid rgba(86,73,151,.1); border-radius:7px; pointer-events:none; }
.memory-front img { width:38%; height:38%; object-fit:contain; opacity:.84; filter:invert(24%) sepia(20%) saturate(1700%) hue-rotate(215deg) brightness(88%); }
.memory-card.matched .memory-front { border-color:var(--cyan); background:linear-gradient(145deg,#edfffb,#d9f8f1); box-shadow:inset 0 0 0 2px rgba(103,232,210,.25); }
.memory-card.matched .memory-front img { filter:invert(47%) sepia(31%) saturate(706%) hue-rotate(119deg) brightness(85%); }

@media (max-width:920px) {
  .main-content{padding:24px 22px 58px}.game-layout{grid-template-columns:1fr;gap:22px}.game-help{max-width:600px}
}
@media (max-width:680px) {
  .keyboard-hint{display:none}.game-grid{grid-template-columns:1fr}.game-card{min-height:232px}
  .card-preview{min-height:120px}.game-toolbar{grid-template-columns:40px 1fr}.game-toolbar h1{font-size:24px}
  .toolbar-actions{grid-column:1/-1;justify-content:flex-end}.game-stage{padding-top:22px}.score-row{align-items:stretch}
  .difficulty-switch{order:4; width:100%; margin-left:0}.difficulty-switch button{flex:1;height:32px}
  .board-2048{gap:6px;padding:6px}.mine-board{gap:1px;padding:4px}.memory-board{gap:5px;padding:8px}
  .snake-console-bar{min-height:60px;padding:8px 10px}.snake-game-name small{display:none}.snake-inline-stats>span{min-width:51px;padding:5px 8px}.snake-pause{width:36px;height:36px}.snake-screen{margin:0 8px}
  .snake-control-bar{min-height:68px;padding:8px 10px 10px}.snake-control-bar>div:first-child small{display:none}.touch-pad{grid-template-columns:repeat(3,34px)}.touch-pad button{width:34px;height:27px}
  .memory-face{border-radius:7px}.memory-card{border-radius:7px}.memory-back::after,.memory-front::after{inset:5px;border-radius:5px}
}
@media (prefers-reduced-motion:reduce) {
  *,*::before,*::after{scroll-behavior:auto!important;transition:none!important}
}