/* Theme Tokens */
:root[data-theme="dark"] {
    --bg: #08090d; --bg-2: #0d0e14; --surface: #13141c; --surface-2: #1c1d28; --surface-3: #252633;
    --border: rgba(255,255,255,0.08); --border-strong: rgba(255,255,255,0.15);
    --text: #f5f5f7; --text-muted: #8b8c98; --text-dim: #5a5b65;
    --accent: #ff6b1a; --accent-hover: #ff8538; --accent-2: #00e5ff;
    --accent-glow: rgba(255,107,26,0.4); --accent-2-glow: rgba(0,229,255,0.3);
    --success: #00d97e; --danger: #ff3860;
    --grid-line: rgba(255,255,255,0.04); --shadow: 0 20px 60px rgba(0,0,0,0.5);
}
:root[data-theme="light"] {
    --bg: #f5f3ec; --bg-2: #ffffff; --surface: #ffffff; --surface-2: #f0ede4; --surface-3: #e6e2d6;
    --border: rgba(0,0,0,0.08); --border-strong: rgba(0,0,0,0.18);
    --text: #1a1a1f; --text-muted: #6b6c75; --text-dim: #a3a4ab;
    --accent: #d94e0f; --accent-hover: #ee5d1a; --accent-2: #0099b8;
    --accent-glow: rgba(217,78,15,0.25); --accent-2-glow: rgba(0,153,184,0.2);
    --success: #00a35e; --danger: #d61f47;
    --grid-line: rgba(0,0,0,0.04); --shadow: 0 20px 60px rgba(0,0,0,0.12);
}

.pf-wrap * { box-sizing: border-box; margin: 0; padding: 0; }
.pf-wrap { position: relative; width: 100%; overflow-x: hidden; background: var(--bg); color: var(--text); font-family: 'Space Grotesk', sans-serif; transition: background-color .4s, color .4s; }
.pf-wrap .pf-mono { font-family: 'JetBrains Mono', monospace; }
.pf-wrap button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

.pf-bg-mesh { position: fixed; inset: 0; z-index: 0; pointer-events: none; background: var(--bg); }
.pf-bg-mesh::before {
    content: ''; position: absolute; inset: 0;
    background: radial-gradient(ellipse 800px 600px at 15% 20%, var(--accent-glow), transparent 60%),
                radial-gradient(ellipse 700px 500px at 85% 80%, var(--accent-2-glow), transparent 60%);
    opacity: .55; animation: pfMeshShift 25s ease-in-out infinite alternate;
}
.pf-bg-mesh::after {
    content: ''; position: absolute; inset: 0;
    background-image: linear-gradient(var(--grid-line) 1px,transparent 1px),linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);
    background-size: 60px 60px; mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}
@keyframes pfMeshShift { 0%{transform:translate(0,0) scale(1)} 100%{transform:translate(40px,-30px) scale(1.1)} }

.pf-floating-shapes { position: fixed; inset: 0; z-index: 1; pointer-events: none; overflow: hidden; }
.pf-shape { position: absolute; opacity: .06; animation: pfFloatShape 30s infinite linear; }
@keyframes pfFloatShape { 0%{transform:translate(0,0) rotate(0deg)} 50%{transform:translate(50px,-100px) rotate(180deg)} 100%{transform:translate(0,0) rotate(360deg)} }

.pf-container { position: relative; z-index: 10; width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

.pf-header { position: sticky; top: 0; z-index: 50; backdrop-filter: blur(20px); background: color-mix(in srgb, var(--bg) 75%, transparent); border-bottom: 1px solid var(--border); padding: 20px 0; }
.pf-logo-mark { width: 36px; height: 36px; position: relative; display: inline-block; }
.pf-logo-mark::before, .pf-logo-mark::after { content: ''; position: absolute; inset: 0; border: 2px solid var(--accent); border-radius: 8px; }
.pf-logo-mark::before { animation: pfLogoSpinA 8s linear infinite; }
.pf-logo-mark::after { border-color: var(--accent-2); transform: rotate(45deg); animation: pfLogoSpinB 8s linear infinite; }
@keyframes pfLogoSpinA { to{transform:rotate(360deg)} }
@keyframes pfLogoSpinB { from{transform:rotate(45deg)} to{transform:rotate(405deg)} }

.pf-theme-toggle { position: relative; width: 60px; height: 30px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 999px; transition: all .3s; }
.pf-theme-toggle::before { content: ''; position: absolute; top: 3px; left: 3px; width: 22px; height: 22px; background: var(--accent); border-radius: 50%; transition: transform .4s, background .3s; box-shadow: 0 0 20px var(--accent-glow); }
:root[data-theme="light"] .pf-theme-toggle::before { transform: translateX(30px); background: var(--accent-2); box-shadow: 0 0 20px var(--accent-2-glow); }

.pf-icon-btn { width: 40px; height: 40px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; transition: all .2s; }
.pf-icon-btn:hover { border-color: var(--border-strong); transform: translateY(-1px); }

.pf-hero-title { font-size: clamp(48px, 8vw, 96px); font-weight: 700; line-height: .95; letter-spacing: -.04em; }
.pf-accent-text { background: linear-gradient(135deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; color: transparent; }
.pf-accent-2-text { color: var(--accent-2); }
.pf-success-text { color: var(--success); }
.pf-pulse-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success); box-shadow: 0 0 12px var(--success); animation: pfPulse 2s infinite; }
@keyframes pfPulse { 0%,100%{opacity:1} 50%{opacity:.4} }

.pf-badge { padding: 6px 12px; border-radius: 999px; background: var(--surface); border: 1px solid var(--border); font-size: 12px; color: var(--text-muted); }
.pf-btn-primary { display: inline-flex; align-items: center; gap: 10px; padding: 14px 28px; background: var(--accent); color: #fff; border-radius: 999px; font-weight: 600; transition: all .3s; position: relative; overflow: hidden; }
.pf-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px var(--accent-glow); }
.pf-btn-ghost { display: inline-flex; align-items: center; gap: 10px; padding: 14px 28px; background: var(--surface); color: var(--text); border: 1px solid var(--border-strong); border-radius: 999px; font-weight: 600; transition: all .3s; }
.pf-btn-ghost:hover { background: var(--surface-2); transform: translateY(-2px); }

.pf-game-card { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: 24px; overflow: hidden; transition: all .5s cubic-bezier(.16,1,.3,1); cursor: pointer; }
.pf-game-card:hover { transform: translateY(-6px); border-color: var(--border-strong); box-shadow: 0 30px 80px -20px var(--accent-glow); }
.pf-card-preview { height: 240px; position: relative; overflow: hidden; background: var(--surface-2); border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: center; }

.pf-preview-slide { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; padding: 16px; width: 75%; height: 75%; }
.pf-preview-slide .p-tile { background: linear-gradient(135deg, var(--accent), var(--accent-hover)); border-radius: 8px; animation: pfTileFloat 4s ease-in-out infinite; }
.pf-preview-slide .p-tile:nth-child(16) { background: transparent; border: 1px dashed var(--border-strong); }
@keyframes pfTileFloat { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-3px)} }

.pf-preview-memory { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; padding: 24px; width: 70%; height: 70%; }
.pf-preview-card { aspect-ratio: 1; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 18px; color: var(--text-dim); background: var(--surface-3); border: 1px solid var(--border-strong); animation: pfCardFlip 4s ease-in-out infinite; }
@keyframes pfCardFlip { 0%,40%,100% { background:var(--surface-3); color:var(--text-dim); } 50%,90% { background:linear-gradient(135deg, var(--accent-2), #00b8d4); color:white; } }

.pf-preview-2048 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; padding: 24px; width: 70%; height: 70%; }
.pf-p-tile { aspect-ratio: 1; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-weight: 700; color: white; font-size: 14px; animation: pfTileAppear 3s ease-in-out infinite; }
.pf-p-tile[data-v="2"] { background:#eee4da; color:#776e65; } .pf-p-tile[data-v="4"] { background:#ede0c8; color:#776e65; }
.pf-p-tile[data-v="8"] { background:#f2b179; } .pf-p-tile[data-v="16"] { background:#f59563; }
.pf-p-tile[data-v="32"] { background:#f67c5f; } .pf-p-tile[data-v="64"] { background:#f65e3b; }
.pf-p-tile[data-v="128"] { background:#edcf72; font-size:11px; } .pf-p-tile[data-v="256"] { background:#edcc61; font-size:11px; }
.pf-p-tile.empty { background: var(--surface-3); }
@keyframes pfTileAppear { 0%,100%{transform:scale(.85); opacity:.6} 50%{transform:scale(1); opacity:1} }

.pf-stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: 20px; padding: 24px; position: relative; overflow: hidden; transition: all .3s; border-top: 3px solid var(--accent); }
.pf-stat-card:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.pf-feature-card { background: var(--surface); border: 1px solid var(--border); border-radius: 20px; padding: 28px; transition: all .3s; }
.pf-feature-card:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.pf-feature-icon { width: 48px; height: 48px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 20px; }
.pf-accent-bg { background: var(--accent-glow); color: var(--accent); }
.pf-accent-2-bg { background: var(--accent-2-glow); color: var(--accent-2); }
.pf-success-bg { background: rgba(0,217,126,0.2); color: var(--success); }
.pf-danger-bg { background: rgba(255,56,96,0.2); color: var(--danger); }

/* Game Overlay */
.pf-game-overlay { position: fixed; inset: 0; z-index: 999999; background: color-mix(in srgb, var(--bg) 95%, transparent); backdrop-filter: blur(20px); display: none; opacity: 0; transition: opacity .3s; flex-direction: column; }
.pf-game-overlay.active { display: flex; opacity: 1; }
.pf-stats-bar { background: var(--surface); border: 1px solid var(--border); border-radius: 999px; display: none; }
.pf-divider { width: 1px; height: 30px; background: var(--border); }

.pf-diff-btn { padding: 8px 16px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 999px; color: var(--text-muted); transition: all .2s; font-size: 13px; font-weight: 500; }
.pf-diff-btn:hover { border-color: var(--border-strong); color: var(--text); }
.pf-diff-btn.active { background: var(--accent); color: white; border-color: var(--accent); }

/* Slide Game */
.pf-slide-board { display: grid; gap: 8px; padding: 8px; background: var(--surface-2); border-radius: 16px; aspect-ratio: 1; width: 100%; max-width: 480px; border: 1px solid var(--border); }
.pf-slide-tile { background: linear-gradient(135deg, var(--accent), var(--accent-hover)); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: clamp(20px, 4vw, 36px); font-weight: 700; color: white; transition: transform .2s, filter .2s; user-select: none; box-shadow: 0 4px 12px rgba(0,0,0,.2); }
.pf-slide-tile:hover:not(.empty) { transform: scale(.95); filter: brightness(1.1); }
.pf-slide-tile.empty { background: transparent; box-shadow: none; cursor: default; }
.pf-slide-tile.solved { background: linear-gradient(135deg, var(--success), #00b868); }

/* Memory Game */
.pf-memory-board { display: grid; gap: 10px; padding: 14px; background: var(--surface-2); border-radius: 16px; border: 1px solid var(--border); width: 100%; max-width: 500px; }
.pf-memory-card { aspect-ratio: 1; perspective: 1000px; cursor: pointer; }
.pf-memory-card-inner { position: relative; width: 100%; height: 100%; transition: transform .6s; transform-style: preserve-3d; }
.pf-memory-card.flipped .pf-memory-card-inner, .pf-memory-card.matched .pf-memory-card-inner { transform: rotateY(180deg); }
.pf-memory-card-front, .pf-memory-card-back { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 28px; }
.pf-memory-card-front { background: linear-gradient(135deg, var(--surface-3), var(--surface-2)); border: 1px solid var(--border-strong); color: var(--text-dim); }
.pf-memory-card-back { background: linear-gradient(135deg, var(--accent-2), #00b8d4); color: white; transform: rotateY(180deg); }
.pf-memory-card.matched .pf-memory-card-back { background: linear-gradient(135deg, var(--success), #00b868); }

/* 2048 Game */
.pf-grid-2048 { display: grid; gap: 10px; padding: 10px; background: var(--surface-2); border-radius: 16px; aspect-ratio: 1; width: 100%; max-width: 440px; position: relative; border: 1px solid var(--border); touch-action: none; }
.pf-cell-2048 { background: var(--surface-3); border-radius: 8px; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: clamp(18px, 3vw, 32px); transition: all .15s; color: white; }
.pf-cell-2048[data-value="2"] { background:#eee4da; color:#776e65; } .pf-cell-2048[data-value="4"] { background:#ede0c8; color:#776e65; }
.pf-cell-2048[data-value="8"] { background:#f2b179; } .pf-cell-2048[data-value="16"] { background:#f59563; }
.pf-cell-2048[data-value="32"] { background:#f67c5f; } .pf-cell-2048[data-value="64"] { background:#f65e3b; }
.pf-cell-2048[data-value="128"] { background:#edcf72; font-size:clamp(14px, 2.5vw, 28px); } .pf-cell-2048[data-value="256"] { background:#edcc61; font-size:clamp(14px, 2.5vw, 28px); }
.pf-cell-2048[data-value="512"] { background:#edc850; font-size:clamp(14px, 2.5vw, 28px); } .pf-cell-2048[data-value="1024"] { background:#edc53f; font-size:clamp(12px, 2vw, 24px); }
.pf-cell-2048[data-value="2048"] { background:#edc22e; font-size:clamp(12px, 2vw, 24px); box-shadow:0 0 30px var(--accent-glow); }
:root[data-theme="dark"] .pf-cell-2048[data-value="2"] { background:#2a2820; color:#c8b896; }
:root[data-theme="dark"] .pf-cell-2048[data-value="4"] { background:#332e22; color:#d8c8a6; }
.pf-cell-2048.new { animation: pfAppear .2s ease; }
@keyframes pfAppear { from{transform:scale(0)} to{transform:scale(1)} }

.pf-result-modal { position: absolute; inset: 0; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); display: none; align-items: center; justify-content: center; border-radius: 16px; z-index: 10; }
.pf-result-modal.active { display: flex; animation: pfFadeIn .4s; }
@keyframes pfFadeIn { from{opacity:0} to{opacity:1} }
.pf-result-content { text-align: center; padding: 40px; animation: pfSlideUp .5s cubic-bezier(.16,1,.3,1); max-width: 90%; }
@keyframes pfSlideUp { from{transform:translateY(40px); opacity:0} to{transform:translateY(0); opacity:1} }

.pf-confetti { position: absolute; width: 10px; height: 10px; pointer-events: none; animation: pfConfettiFall 3s ease-out forwards; }
@keyframes pfConfettiFall { 0%{transform:translateY(-100px) rotate(0deg); opacity:1} 100%{transform:translateY(500px) rotate(720deg); opacity:0} }

.pf-toast-container { position: fixed; bottom: 30px; right: 30px; z-index: 1000000; display: flex; flex-direction: column; gap: 10px; }
.pf-toast { background: var(--surface); border: 1px solid var(--border-strong); border-radius: 12px; padding: 14px 20px; box-shadow: var(--shadow); animation: pfSlideInRight .3s, pfSlideOutRight .3s 2.7s forwards; display: flex; align-items: center; gap: 12px; max-width: 320px; }
@keyframes pfSlideInRight { from{transform:translateX(120%); opacity:0} to{transform:translateX(0); opacity:1} }
@keyframes pfSlideOutRight { to{transform:translateX(120%); opacity:0} }

/* Hero Visual */
.pf-hero-visual { position: relative; aspect-ratio: 1; max-width: 480px; margin: 0 auto; display: none; }
.pf-hero-tile { position: absolute; border-radius: 16px; background: linear-gradient(135deg, var(--surface), var(--surface-2)); border: 1px solid var(--border-strong); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 28px; transition: all .6s; box-shadow: 0 10px 30px rgba(0,0,0,.2); animation: pfHeroFloat 3s ease-in-out infinite; }
.pf-hero-tile.accent { background: linear-gradient(135deg, var(--accent), var(--accent-hover)); color: white; border: none; }
.pf-hero-tile.accent-2 { background: linear-gradient(135deg, var(--accent-2), #00b8d4); color: white; border: none; }
.pf-hero-tile.glow { box-shadow: 0 10px 40px var(--accent-glow); }
@keyframes pfHeroFloat { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-8px)} }

/* Layout Utilities */
.pf-flex { display: flex; } .pf-grid { display: grid; }
.pf-items-center { align-items: center; } .pf-justify-between { justify-content: space-between; }
.pf-justify-center { justify-content: center; }
.pf-flex-wrap { flex-wrap: wrap; } .pf-flex-col { flex-direction: column; }
.pf-gap-2 { gap: 8px; } .pf-gap-3 { gap: 12px; } .pf-gap-4 { gap: 16px; }
.pf-gap-6 { gap: 24px; } .pf-gap-8 { gap: 32px; } .pf-gap-12 { gap: 48px; }
.pf-py-6 { padding-top: 24px; padding-bottom: 24px; } .pf-py-16 { padding-top: 64px; padding-bottom: 64px; } .pf-py-20 { padding-top: 80px; padding-bottom: 80px; }
.pf-mb-2 { margin-bottom: 8px; } .pf-mb-4 { margin-bottom: 16px; } .pf-mb-6 { margin-bottom: 24px; }
.pf-mb-10 { margin-bottom: 40px; } .pf-mt-6 { margin-top: 24px; } .pf-mt-12 { margin-top: 48px; }
.pf-text-xs { font-size: 12px; } .pf-text-sm { font-size: 14px; } .pf-text-lg { font-size: 18px; }
.pf-text-2xl { font-size: 24px; } .pf-text-3xl { font-size: 30px; } .pf-text-4xl { font-size: 36px; }
.pf-font-bold { font-weight: 700; } .pf-text-center { text-align: center; }
.pf-max-w-xl { max-width: 560px; } .pf-max-w-md { max-width: 420px; }
.pf-h-full { height: 100%; } .pf-flex-1 { flex: 1; }
.pf-grid-cols-3 { grid-template-columns: repeat(3, 1fr); }

/* Responsive */
@media (min-width: 768px) {
    .pf-md-grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
    .pf-md-grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
    .pf-sm-flex { display: flex; }
    .pf-hero-visual { display: block; }
}
@media (min-width: 1024px) {
    .pf-lg-grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 767px) {
    .pf-hero-title { font-size: clamp(40px, 12vw, 64px); }
    .pf-toast-container { bottom: 20px; right: 20px; left: 20px; }
    .pf-toast { max-width: none; }
    .pf-stats-bar { display: flex !important; border-radius: 12px; padding: 10px; width: 100%; justify-content: space-around; }
}