@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&family=Inter:wght@300;400;600;700&display=swap');
:root{--bg:#0a0e1a;--surface:#111827;--card:#1a2236;--border:#263354;--primary:#3b82f6;--accent:#06b6d4;--gold:#f59e0b;--text:#e2e8f0;--muted:#94a3b8;--grad1:linear-gradient(135deg,#3b82f6,#06b6d4);--grad2:linear-gradient(135deg,#f59e0b,#f97316);--glow:0 0 30px rgba(59,130,246,.3)}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Noto Sans SC','Inter',sans-serif;background:var(--bg);color:var(--text);overflow:hidden}
.deck{width:100vw;height:100vh;position:relative}
.slide{width:100vw;height:100vh;display:none;position:absolute;top:0;left:0;padding:60px 80px;flex-direction:column;justify-content:center;overflow:hidden}
.slide.active{display:flex;animation:fadeIn .6s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
@keyframes pulse{0%,100%{opacity:.6}50%{opacity:1}}
@keyframes slideRight{from{transform:translateX(-30px);opacity:0}to{transform:translateX(0);opacity:1}}

/* Nav */
.nav{position:fixed;bottom:30px;right:40px;display:flex;gap:12px;z-index:100}
.nav button{width:48px;height:48px;border-radius:50%;border:1px solid var(--border);background:rgba(17,24,39,.85);color:var(--text);font-size:18px;cursor:pointer;backdrop-filter:blur(10px);transition:.3s}
.nav button:hover{background:var(--primary);border-color:var(--primary);box-shadow:var(--glow)}
.counter{position:fixed;bottom:38px;left:40px;font-size:14px;color:var(--muted);z-index:100;font-family:'Inter'}
.progress{position:fixed;top:0;left:0;height:3px;background:var(--grad1);z-index:100;transition:width .4s}

/* Slide backgrounds */
.slide::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;z-index:0}
.slide>*{position:relative;z-index:1}
.bg-grid::before{background:radial-gradient(circle at 20% 80%,rgba(59,130,246,.08) 0%,transparent 50%),radial-gradient(circle at 80% 20%,rgba(6,182,212,.08) 0%,transparent 50%)}
.bg-hero{padding:0!important;justify-content:flex-end!important}
.bg-hero .hero-img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;opacity:.35;z-index:0}
.bg-hero .hero-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(to top,var(--bg) 10%,transparent 60%);z-index:1}
.hero-content{z-index:2;padding:0 80px 80px}
.hero-content h1{font-size:3rem;font-weight:900;background:var(--grad1);-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:16px;line-height:1.3}
.hero-content p{font-size:1.1rem;color:var(--muted);max-width:700px}
.hero-content .tag{display:inline-block;padding:6px 18px;border-radius:20px;background:rgba(59,130,246,.15);border:1px solid rgba(59,130,246,.3);color:var(--primary);font-size:.85rem;margin-bottom:20px}

/* Typography */
h2{font-size:2rem;font-weight:700;margin-bottom:8px;background:var(--grad1);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
h3{font-size:1.3rem;font-weight:600;color:var(--accent);margin-bottom:12px}
.subtitle{color:var(--muted);font-size:1rem;margin-bottom:40px}
p,.desc{color:var(--muted);font-size:.95rem;line-height:1.8}
.highlight{color:var(--gold);font-weight:600}

/* Cards */
.cards{display:grid;gap:20px;margin-top:20px}
.cards-2{grid-template-columns:1fr 1fr}
.cards-3{grid-template-columns:1fr 1fr 1fr}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:28px;transition:.3s;position:relative;overflow:hidden}
.card:hover{border-color:var(--primary);transform:translateY(-4px);box-shadow:var(--glow)}
.card::after{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad1);opacity:0;transition:.3s}
.card:hover::after{opacity:1}
.card .icon{font-size:2rem;margin-bottom:12px;display:block}
.card h4{font-size:1.05rem;font-weight:600;color:var(--text);margin-bottom:8px}
.card p{font-size:.85rem;color:var(--muted);line-height:1.7}

/* Architecture diagram */
.arch{display:flex;flex-direction:column;align-items:center;gap:0;margin-top:10px;width:100%}
.arch-layer{width:90%;max-width:900px;padding:16px 24px;border-radius:12px;text-align:center;position:relative;border:1px solid;transition:.3s}
.arch-layer:hover{transform:scale(1.02)}
.arch-layer h4{font-size:.95rem;font-weight:700;margin-bottom:4px}
.arch-layer p{font-size:.78rem;opacity:.8}
.layer1{background:rgba(239,68,68,.1);border-color:rgba(239,68,68,.3);color:#fca5a5}
.layer2{background:rgba(59,130,246,.1);border-color:rgba(59,130,246,.3);color:#93c5fd}
.layer3{background:rgba(245,158,11,.1);border-color:rgba(245,158,11,.3);color:#fcd34d}
.layer45-wrap{display:flex;gap:20px;width:90%;max-width:900px}
.layer4{background:rgba(16,185,129,.1);border-color:rgba(16,185,129,.3);color:#6ee7b7;flex:1}
.layer5{background:rgba(139,92,246,.1);border-color:rgba(139,92,246,.3);color:#c4b5fd;flex:1}
.arrow{width:2px;height:24px;background:var(--border);margin:0 auto;position:relative}
.arrow::after{content:'▼';position:absolute;bottom:-10px;left:50%;transform:translateX(-50%);color:var(--muted);font-size:10px}
.arrow-split{display:flex;justify-content:center;align-items:flex-end;width:90%;max-width:900px;height:30px;position:relative}
.arrow-split::before{content:'';position:absolute;top:0;left:50%;width:2px;height:10px;background:var(--border)}
.arrow-split::after{content:'';position:absolute;top:10px;left:25%;width:50%;height:2px;background:var(--border)}
.arrow-split .a-l,.arrow-split .a-r{position:absolute;top:10px;width:2px;height:20px;background:var(--border)}
.arrow-split .a-l{left:25%}.arrow-split .a-r{right:25%}
.arrow-split .a-l::after,.arrow-split .a-r::after{content:'▼';position:absolute;bottom:-10px;left:50%;transform:translateX(-50%);color:var(--muted);font-size:10px}

/* Split layout */
.split{display:flex;gap:40px;align-items:center;margin-top:20px}
.split .text{flex:1}
.split .visual{flex:1;display:flex;justify-content:center}
.split .visual img{width:100%;max-width:450px;border-radius:16px;border:1px solid var(--border);box-shadow:0 20px 60px rgba(0,0,0,.4)}

/* List */
.list{list-style:none;margin-top:16px}
.list li{padding:10px 16px;border-left:3px solid var(--primary);margin-bottom:10px;background:rgba(59,130,246,.05);border-radius:0 8px 8px 0;font-size:.9rem;line-height:1.6;color:var(--muted)}
.list li strong{color:var(--text)}

/* Flow */
.flow{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:20px;justify-content:center}
.flow-node{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px 20px;text-align:center;min-width:140px}
.flow-node h4{font-size:.85rem;color:var(--text)}
.flow-node p{font-size:.75rem;color:var(--muted)}
.flow-arrow{font-size:1.5rem;color:var(--primary)}

/* TOC */
.toc{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:30px}
.toc-item{display:flex;align-items:center;gap:12px;padding:14px 20px;background:var(--card);border:1px solid var(--border);border-radius:12px;cursor:pointer;transition:.3s}
.toc-item:hover{border-color:var(--primary);background:rgba(59,130,246,.08)}
.toc-num{width:36px;height:36px;border-radius:50%;background:var(--grad1);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem;flex-shrink:0}
.toc-text{font-size:.9rem}

/* Badge */
.badge{display:inline-block;padding:4px 12px;border-radius:8px;font-size:.75rem;font-weight:600;margin-right:6px}
.badge-blue{background:rgba(59,130,246,.15);color:var(--primary)}
.badge-gold{background:rgba(245,158,11,.15);color:var(--gold)}
.badge-green{background:rgba(16,185,129,.15);color:#34d399}
.badge-red{background:rgba(239,68,68,.15);color:#f87171}

/* Responsive */
@media(max-width:900px){.slide{padding:30px 30px}.hero-content{padding:0 30px 40px}.hero-content h1{font-size:2rem}h2{font-size:1.5rem}.cards-2,.cards-3,.toc{grid-template-columns:1fr}.split{flex-direction:column}.layer45-wrap{flex-direction:column}}