/* ===== 游戏大厅 - 玻璃拟态主题 v2 ===== */
* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }

/* ===== 深色主题（默认） ===== */
:root,
[data-theme="dark"] {
  --bg: #070b19;
  --bg2: #0d1326;
  --bg3: #111a33;
  --surface: rgba(20,30,55,0.75);
  --surface-solid: #141e37;
  --surface-hover: rgba(30,44,70,0.85);
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(255,255,255,0.12);
  --text: #e8edf5;
  --text2: #8f9bb8;
  --text3: #5c6988;
  --primary: #818cf8;
  --primary2: #6366f1;
  --primary-dim: rgba(99,102,241,0.15);
  --accent: #a78bfa;
  --accent-dim: rgba(167,139,250,0.12);
  --red: #f87171;
  --green: #4ade80;
  --yellow: #fbbf24;
  --orange: #fb923c;
  --cyan: #22d3ee;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.3);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 0 0 rgba(99,102,241,0);
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
}

/* ===== 浅色主题 ===== */
[data-theme="light"] {
  --bg: #f0f2f8;
  --bg2: #e4e7f0;
  --bg3: #d8dce8;
  --surface: rgba(255,255,255,0.75);
  --surface-solid: #ffffff;
  --surface-hover: rgba(255,255,255,0.92);
  --border: rgba(0,0,0,0.06);
  --border-hover: rgba(0,0,0,0.12);
  --text: #1a1d2e;
  --text2: #4a5070;
  --text3: #8b90a8;
  --primary: #5b5ff0;
  --primary2: #4f46e5;
  --primary-dim: rgba(79,70,229,0.1);
  --accent: #8b5cf6;
  --accent-dim: rgba(139,92,246,0.08);
  --red: #ef4444;
  --green: #22c55e;
  --yellow: #eab308;
  --orange: #f97316;
  --cyan: #06b6d4;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.12);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  line-height:1.6;
  color:var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse at 20% 0%, var(--primary-dim) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, var(--accent-dim) 0%, transparent 50%);
  background-attachment: fixed;
  min-height: 100vh;
  transition: background 0.4s, color 0.3s;
}

/* Custom scrollbar */
::-webkit-scrollbar { width:6px; }
::-webkit-scrollbar-track { background:var(--bg); }
::-webkit-scrollbar-thumb { background:var(--text3); border-radius:3px; }
::-webkit-scrollbar-thumb:hover { background:var(--text2); }

::selection { background:var(--primary-dim); color:var(--primary); }

/* ===== Containers ===== */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }

/* ===== Navbar ===== */
.navbar {
  position:sticky; top:0; z-index:100;
  background:var(--surface);
  backdrop-filter:blur(20px) saturate(180%);
  -webkit-backdrop-filter:blur(20px) saturate(180%);
  border-bottom:1px solid var(--border);
  transition: all var(--transition);
}
.navbar .container {
  display:flex; justify-content:space-between; align-items:center; height:64px;
  max-width:1200px;
}
.logo {
  font-size:22px; font-weight:800; color:var(--primary);
  text-decoration:none; letter-spacing:-0.5px;
  display:flex; align-items:center; gap:8px;
}
.logo:hover { color:var(--accent); }
.logo .logo-icon {
  width:34px; height:34px; border-radius:10px;
  object-fit:contain;
}
.nav-links { display:flex; list-style:none; gap:4px; }
.nav-links a {
  text-decoration:none; color:var(--text2); font-weight:500; font-size:14px;
  padding:8px 16px; border-radius:8px; transition:all var(--transition);
  position:relative;
}
.nav-links a:hover, .nav-links a.active { color:var(--text); background:var(--primary-dim); }
.nav-links a.active::after {
  content:''; position:absolute; bottom:2px; left:50%; transform:translateX(-50%);
  width:20px; height:3px; background:var(--primary); border-radius:2px;
}
/* Hamburger */
.hamburger { display:none; flex-direction:column; gap:4px; cursor:pointer; padding:8px; background:none; border:none; }
.hamburger span { width:22px; height:2px; background:var(--text); border-radius:1px; transition:all var(--transition); }
.hamburger.open span:nth-child(1) { transform:rotate(45deg) translate(4px,4px); }
.hamburger.open span:nth-child(2) { opacity:0; }
.hamburger.open span:nth-child(3) { transform:rotate(-45deg) translate(4px,-4px); }

/* ===== Toolbar ===== */
.game-toolbar { display:flex; gap:6px; align-items:center; }
.tool-btn {
  width:38px; height:38px; border-radius:10px; border:1px solid var(--border);
  background:var(--surface); color:var(--text2); cursor:pointer;
  font-size:16px; display:flex; align-items:center; justify-content:center;
  transition:all var(--transition);
}
.tool-btn:hover { background:var(--surface-hover); color:var(--text); border-color:var(--border-hover); }
.tool-btn.active { background:var(--primary-dim); color:var(--primary); border-color:var(--primary); }

/* ===== Theme Toggle ===== */
.theme-toggle {
  position:relative; width:68px; height:34px; border-radius:17px; border:1px solid var(--border);
  background:var(--surface); cursor:pointer; transition:all var(--transition);
  display:flex; align-items:center; padding:3px;
}
.theme-toggle .thumb {
  width:26px; height:26px; border-radius:50%; background:var(--primary2);
  display:flex; align-items:center; justify-content:center; font-size:13px;
  transition:transform var(--transition);
  box-shadow:0 2px 6px rgba(0,0,0,0.2);
}
.theme-toggle.light .thumb { transform:translateX(34px); }

/* ===== Hero ===== */
.hero {
  position:relative; padding:140px 0 120px; text-align:center; overflow:hidden;
  background:linear-gradient(180deg, var(--primary-dim) 0%, transparent 60%);
}
#particles { position:absolute; top:0; left:0; width:100%; height:100%; pointer-events:none; }
.hero-content { position:relative; z-index:1; }
.hero-badge {
  display:inline-flex; align-items:center; gap:6px;
  padding:8px 20px; border-radius:24px; font-size:13px;
  font-weight:600; color:var(--primary);
  background:var(--primary-dim);
  border:1px solid rgba(99,102,241,0.2);
  margin-bottom:24px;
  animation: fadeInUp 0.6s ease-out both;
}
.hero-badge .dot { width:7px; height:7px; background:var(--green); border-radius:50%; animation:pulse 2s infinite; }
.hero-title { font-size:clamp(34px, 8vw, 60px); font-weight:800; color:var(--text); margin-bottom:16px; letter-spacing:-1.5px; line-height:1.1; animation: fadeInUp 0.6s 0.1s ease-out both; }
.hero-title span { background:linear-gradient(135deg, var(--primary), var(--accent), var(--cyan)); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; }
.hero-subtitle { font-size:18px; color:var(--text2); margin-bottom:40px; max-width:520px; margin-left:auto; margin-right:auto; line-height:1.6; animation: fadeInUp 0.6s 0.2s ease-out both; }
.hero-subtitle .cursor { color:var(--primary); animation:blink 1s step-end infinite; }
.hero-actions { display:flex; gap:14px; justify-content:center; flex-wrap:wrap; animation: fadeInUp 0.6s 0.3s ease-out both; }

@keyframes blink { 0%,100%{opacity:1;} 50%{opacity:0;} }

.btn-primary {
  display:inline-flex; align-items:center; gap:8px;
  padding:14px 36px; font-size:16px; font-weight:600; color:#fff;
  background:linear-gradient(135deg, var(--primary2), #8b5cf6);
  border:none; border-radius:12px; cursor:pointer; text-decoration:none;
  transition:all var(--transition);
  box-shadow:0 4px 20px rgba(99,102,241,0.35), 0 0 0 0 rgba(99,102,241,0.4);
}
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 8px 30px rgba(99,102,241,0.5), 0 0 0 6px rgba(99,102,241,0.1); }
.btn-primary:active { transform:translateY(0); }

.btn-secondary {
  display:inline-flex; align-items:center; gap:6px;
  padding:12px 28px; font-size:15px; font-weight:600; color:var(--text);
  background:var(--surface); border:1px solid var(--border);
  border-radius:12px; cursor:pointer; text-decoration:none; transition:all var(--transition);
}
.btn-secondary:hover { background:var(--surface-hover); border-color:var(--border-hover); transform:translateY(-1px); }

/* ===== Section Headers ===== */
.games-section, .leaderboard-section, .about { padding:80px 0; }
.section-header { text-align:center; margin-bottom:48px; }
.section-title { font-size:32px; font-weight:700; color:var(--text); margin-bottom:8px; }
.section-subtitle { color:var(--text2); font-size:15px; }
.section-divider {
  width:60px; height:4px; background:linear-gradient(90deg, var(--primary), var(--accent));
  border-radius:2px; margin:16px auto 0;
}

/* ===== Search & Filter ===== */
.search-filter { display:flex; gap:10px; justify-content:center; margin-bottom:32px; flex-wrap:wrap; }
.search-input {
  padding:10px 16px 10px 38px; border-radius:10px; border:1px solid var(--border);
  background:var(--surface); color:var(--text); font-size:14px;
  outline:none; min-width:240px; transition:all var(--transition);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%238f9bb8'%3E%3Cpath d='M11.742 10.344a6.5 6.5 0 1 0-1.397 1.398h-.001l3.85 3.85a1 1 0 0 0 1.415-1.414l-3.85-3.85zm-5.242.156a5 5 0 1 1 0-10 5 5 0 0 1 0 10z'/%3E%3C/svg%3E");
  background-repeat:no-repeat; background-position:12px center;
}
.search-input:focus { border-color:var(--primary); box-shadow:0 0 0 3px var(--primary-dim); }
.filter-tags { display:flex; gap:6px; flex-wrap:wrap; }
.filter-tag {
  padding:6px 14px; border-radius:20px; border:1px solid var(--border);
  background:transparent; color:var(--text2); cursor:pointer;
  font-size:12px; font-weight:600; transition:all var(--transition);
}
.filter-tag:hover, .filter-tag.active { background:var(--primary-dim); color:var(--primary); border-color:var(--primary); }

/* ===== Game Grid ===== */
.game-grid { display:grid; grid-template-columns:repeat(auto-fill, minmax(340px, 1fr)); gap:24px; }
.game-card {
  display:flex; flex-direction:column;
  background:var(--surface); border-radius:var(--radius);
  overflow:hidden; text-decoration:none; cursor:pointer;
  border:1px solid var(--border);
  transition:all 0.4s cubic-bezier(0.4,0,0.2,1);
  position:relative; transform-style:preserve-3d; perspective:1000px;
}
.game-card::before {
  content:''; position:absolute; inset:0; border-radius:var(--radius);
  background:radial-gradient(600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--primary-dim), transparent 40%);
  opacity:0; transition:opacity 0.4s; pointer-events:none; z-index:1;
}
.game-card:hover::before { opacity:1; }
.game-card:hover {
  transform:translateY(-8px);
  box-shadow:var(--shadow-lg), 0 0 0 1px rgba(99,102,241,0.15);
  border-color:rgba(99,102,241,0.25);
}
.game-card:active { transform:scale(0.98); }

.game-card-cover {
  height:130px; display:flex; align-items:center; justify-content:center;
  position:relative; overflow:hidden;
}
.game-card-cover .cover-bg {
  position:absolute; inset:0; transition:transform 0.5s;
}
.game-card:hover .game-card-cover .cover-bg { transform:scale(1.08); }
.game-card-cover::after {
  content:''; position:absolute; inset:0;
  background:radial-gradient(circle at 50% 0%, rgba(255,255,255,0.1), transparent 60%);
  pointer-events:none;
}
.game-card-emoji {
  font-size:56px; position:relative; z-index:2;
  filter:drop-shadow(0 4px 12px rgba(0,0,0,0.3));
  transition:transform 0.4s;
}
.game-card:hover .game-card-emoji { transform:scale(1.15) translateY(-4px); }
.game-card-body { padding:18px 20px 8px; display:flex; flex-direction:column; gap:6px; flex:1; position:relative; z-index:2; }
.game-card-body h3 { font-size:18px; font-weight:700; color:var(--text); }
.game-card-body p { color:var(--text2); font-size:13px; line-height:1.5; }
.game-card-footer { display:flex; gap:6px; padding:0 20px 16px; position:relative; z-index:2; }
.game-card-badge {
  padding:4px 10px; border-radius:20px; font-size:11px; font-weight:600;
  background:var(--primary-dim); color:var(--primary);
}
/* Cover gradients */
.bg-snake { background:linear-gradient(135deg, #064e3b, #059669, #10b981); }
.bg-2048 { background:linear-gradient(135deg, #78350f, #b45309, #f59e0b); }
.bg-tetris { background:linear-gradient(135deg, #3b0764, #6d28d9, #8b5cf6); }
.bg-mine { background:linear-gradient(135deg, #7f1d1d, #b91c1c, #ef4444); }
.bg-memory { background:linear-gradient(135deg, #1e3a8a, #2563eb, #60a5fa); }
.bg-react { background:linear-gradient(135deg, #92400e, #d97706, #fbbf24); }
.bg-typing { background:linear-gradient(135deg, #064e3b, #0891b2, #22d3ee); }
.bg-breakout { background:linear-gradient(135deg, #4a1d6b, #a21caf, #d946ef); }

/* ===== Recent Games ===== */
.recent-section { padding:0 0 50px; }
.recent-grid { display:flex; gap:12px; flex-wrap:wrap; justify-content:center; }
.recent-card {
  display:flex; align-items:center; gap:12px;
  padding:12px 18px; background:var(--surface); border-radius:var(--radius-sm);
  border:1px solid var(--border); text-decoration:none;
  color:var(--text); transition:all var(--transition);
}
.recent-card:hover { background:var(--surface-hover); border-color:var(--border-hover); transform:translateY(-2px); }
.recent-card .recent-emoji { font-size:24px; }
.recent-card .recent-info { font-size:13px; }
.recent-card .recent-info strong { color:var(--primary); font-size:15px; display:block; }
.recent-card .recent-time { font-size:11px; color:var(--text3); }

/* ===== Stats Panel ===== */
.stats-panel { padding:60px 0; }
.stats-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(200px, 1fr)); gap:16px; }
.stat-card {
  text-align:center; padding:24px 16px; background:var(--surface);
  border-radius:var(--radius-sm); border:1px solid var(--border);
  transition:all var(--transition);
}
.stat-card:hover { background:var(--surface-hover); border-color:var(--border-hover); }
.stat-card .stat-icon { font-size:32px; margin-bottom:8px; }
.stat-card .stat-val { font-size:36px; font-weight:800; color:var(--primary); }
.stat-card .stat-lbl { font-size:12px; color:var(--text3); margin-top:4px; text-transform:uppercase; letter-spacing:1px; }

/* ===== Leaderboard ===== */
.leaderboard-section { padding:80px 0; }
.lb-grid { display:grid; grid-template-columns:repeat(4, 1fr); gap:14px; }
.lb-card {
  display:flex; align-items:center; gap:12px;
  background:var(--surface); border-radius:var(--radius-sm);
  padding:16px; border:1px solid var(--border);
  transition:all var(--transition);
}
.lb-card:hover { background:var(--surface-hover); border-color:var(--border-hover); transform:translateY(-2px); }
.lb-card.has-score { border-left:3px solid var(--primary); }
.lb-icon { font-size:28px; flex-shrink:0; }
.lb-info { flex:1; min-width:0; }
.lb-info h4 { font-size:12px; color:var(--text3); font-weight:500; margin-bottom:4px; }
.lb-score { font-size:18px; font-weight:700; color:var(--primary); }
.lb-score.lb-empty { color:var(--text3); font-size:13px; font-weight:400; font-style:italic; }
.lb-empty-hint { font-size:10px; color:var(--primary); margin-top:2px; }

/* ===== About / Stats ===== */
.about { padding:80px 0; background:var(--surface); }
.about-text { text-align:center; max-width:600px; margin:0 auto 36px; font-size:16px; color:var(--text2); line-height:1.7; }
.stats { display:flex; justify-content:center; gap:60px; flex-wrap:wrap; }
.stat-item { text-align:center; }
.stat-item strong { display:block; font-size:40px; color:var(--primary); font-weight:800; }
.stat-item span { font-size:13px; color:var(--text3); margin-top:4px; display:block; }

/* ===== Footer ===== */
.footer { padding:24px 0; text-align:center; background:var(--bg2); color:var(--text3); font-size:13px; border-top:1px solid var(--border); }

/* ===== Game Page Common ===== */
.game-page {
  min-height:calc(100vh - 64px); display:flex; flex-direction:column;
  align-items:center; padding:32px 20px 60px;
}
.game-page h1 { font-size:30px; margin-bottom:6px; color:var(--text); }
.game-subtitle { color:var(--text2); margin-bottom:20px; font-size:14px; text-align:center; }
.game-subtitle kbd {
  background:var(--surface-solid); padding:2px 7px; border-radius:4px;
  font-size:12px; color:var(--primary); border:1px solid var(--border);
  font-family:inherit;
}
.back-link { display:inline-block; margin-bottom:16px; color:var(--primary); text-decoration:none; font-weight:500; font-size:14px; transition:color var(--transition); }
.back-link:hover { color:var(--accent); }

.game-container {
  background:var(--surface); backdrop-filter:blur(16px);
  border:1px solid var(--border); border-radius:var(--radius); padding:24px;
  box-shadow:var(--shadow-md);
}

.game-header {
  display:flex; justify-content:space-between; align-items:center;
  margin-bottom:16px; gap:12px; flex-wrap:wrap;
}
.game-header .stats-group { display:flex; gap:16px; flex-wrap:wrap; align-items:center; }

.score-display { font-size:15px; font-weight:600; color:var(--text2); white-space:nowrap; }
.score-display strong { color:var(--primary); font-weight:700; }
.score-display.best strong { color:var(--yellow); }

.btn-game {
  padding:8px 20px; font-size:13px; font-weight:600; color:#fff;
  background:var(--primary2); border:none; border-radius:8px;
  cursor:pointer; transition:all var(--transition);
}
.btn-game:hover { background:#4f46e5; transform:translateY(-1px); box-shadow:0 4px 12px rgba(99,102,241,0.3); }
.btn-game:active { transform:scale(0.96); }
.btn-game.warn { background:var(--yellow); color:#1e293b; }
.btn-game.warn:hover { background:#d97706; color:#fff; }
.btn-game.danger { background:var(--red); }
.btn-game.danger:hover { background:#dc2626; }
.btn-game.outline {
  background:transparent; border:1px solid var(--primary);
  color:var(--primary);
}
.btn-game.outline:hover { background:var(--primary-dim); }

/* Diff buttons */
.diff-group { display:flex; gap:4px; background:var(--bg3); border-radius:8px; padding:3px; }
.diff-btn {
  padding:7px 14px; border:none; border-radius:6px; background:transparent;
  color:var(--text2); cursor:pointer; font-size:12px; font-weight:600; transition:all var(--transition);
}
.diff-btn.active { background:var(--primary2); color:#fff; box-shadow:0 2px 8px rgba(99,102,241,0.3); }
.diff-btn:hover:not(.active) { color:var(--text); }

/* Panels */
.panel {
  background:var(--surface); border-radius:var(--radius-sm);
  padding:14px; border:1px solid var(--border);
}
.panel h4 { color:var(--text3); font-size:11px; margin-bottom:8px; text-transform:uppercase; letter-spacing:1.5px; font-weight:600; }
.panel .val { font-size:22px; font-weight:700; color:var(--text); }

/* Key hints */
.key-hints { display:grid; grid-template-columns:1fr 1fr; gap:4px 6px; font-size:11px; color:var(--text3); margin-top:8px; }
.key-hints span { color:var(--primary); font-weight:600; }

/* Confetti canvas */
#confetti-canvas { position:fixed; top:0; left:0; width:100%; height:100%; pointer-events:none; z-index:9999; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .game-grid { grid-template-columns:repeat(2, 1fr); }
  .lb-grid { grid-template-columns:repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .hamburger { display:flex; }
  .nav-links {
    display:none; flex-direction:column; position:absolute; top:64px; left:0; right:0;
    background:var(--surface); backdrop-filter:blur(20px); padding:12px; gap:4px;
    border-bottom:1px solid var(--border);
  }
  .nav-links.open { display:flex; }
  .hero-title { font-size:clamp(28px, 8vw, 42px); }
  .hero { padding:100px 0 80px; }
  .game-grid { grid-template-columns:1fr; max-width:400px; margin:0 auto; }
  .lb-grid { grid-template-columns:repeat(2, 1fr); }
  .stats { gap:28px; }
  .game-container { padding:16px; }
  .stats-grid { grid-template-columns:repeat(2, 1fr); }
  .search-filter { flex-direction:column; align-items:center; }
}
@media (max-width: 480px) {
  .lb-grid { grid-template-columns:1fr 1fr; }
  .section-title { font-size:24px; }
  .stats-grid { grid-template-columns:1fr; }
  .hero-actions { flex-direction:column; align-items:center; }
}

/* ===== Animations ===== */
@keyframes fadeInUp { from { opacity:0; transform:translateY(20px); } to { opacity:1; transform:translateY(0); } }
@keyframes fadeIn { from { opacity:0; } to { opacity:1; } }
@keyframes scaleIn { from { opacity:0; transform:scale(0.85); } to { opacity:1; transform:scale(1); } }
@keyframes shimmer { 0%{background-position:-200% 0;} 100%{background-position:200% 0;} }
@keyframes pulse { 0%,100%{opacity:1;} 50%{opacity:0.4;} }
@keyframes slideDown { from { opacity:0; transform:translateY(-10px); } to { opacity:1; transform:translateY(0); } }
.anim-fade-up { animation:fadeInUp 0.6s ease-out both; }
.anim-scale-in { animation:scaleIn 0.3s ease-out both; }
.anim-slide-down { animation:slideDown 0.3s ease-out both; }