/* ===== RESET & BASE ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;font-size:16px}
body{font-family:-apple-system,"SF Pro Text","SF Pro Display","Helvetica Neue","PingFang SC","Microsoft YaHei",sans-serif;color:#1d1d1f;background:#000;line-height:1.47;letter-spacing:-0.022em;overflow-x:hidden}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}

/* ===== UTILITIES ===== */
.container{max-width:980px;margin:0 auto;padding:0 24px}

/* ===== NAVIGATION ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(0,0,0,.82);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);height:48px;transition:background .3s}
.nav-inner{max-width:980px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:100%}
.nav-left-group{display:flex;align-items:center;gap:14px}
.nav-home-btn{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border-radius:9999px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);color:rgba(255,255,255,.9);font-size:12px;font-weight:600;text-decoration:none;letter-spacing:.2px;transition:all .3s ease;white-space:nowrap}
.nav-home-btn:hover{background:rgba(94,106,210,.22);border-color:rgba(130,143,255,.5);color:#fff;transform:translateX(-2px);box-shadow:0 0 14px rgba(94,106,210,.25)}
.nav-home-arrow{font-size:13px;line-height:1;transition:transform .3s}
.nav-home-btn:hover .nav-home-arrow{transform:translateX(-3px)}
.nav-home-icon{font-size:12px;opacity:.9}
.nav-logo{font-size:14px;font-weight:600;color:#fff;letter-spacing:-0.02em}
.nav-links{display:flex;gap:28px}
.nav-links a{font-size:12px;color:rgba(255,255,255,.8);transition:color .2s;font-weight:400}
.nav-links a:hover{color:#fff}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:20px;cursor:pointer}

/* ===== HERO ===== */
.hero{position:relative;min-height:100vh;background:#000;display:flex;align-items:center;justify-content:center;text-align:center;padding:120px 24px 80px;overflow:hidden}
.hero-bg-text{position:absolute;font-size:clamp(200px,30vw,400px);font-weight:700;color:rgba(255,255,255,.03);letter-spacing:-10px;user-select:none;pointer-events:none}
.hero-label{font-size:14px;color:rgba(255,255,255,.5);letter-spacing:0.1em;text-transform:uppercase;margin-bottom:16px;font-weight:400;animation:fadeUp .8s ease both}
.hero-title{font-size:clamp(40px,8vw,72px);font-weight:700;color:#fff;line-height:1.05;letter-spacing:-0.03em;margin-bottom:20px;animation:fadeUp .8s .15s ease both}
.hero-sub{font-size:clamp(16px,2vw,21px);color:rgba(255,255,255,.7);max-width:600px;margin:0 auto 56px;line-height:1.5;font-weight:400;animation:fadeUp .8s .3s ease both}
.hero-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;animation:fadeUp .8s .45s ease both}
.hero-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:28px 20px;text-align:left;transition:all .35s cubic-bezier(.4,0,.2,1);display:flex;flex-direction:column;gap:6px}
.hero-card:hover{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.2);transform:translateY(-4px)}
.hero-card-num{font-size:13px;color:#2997ff;font-weight:600;letter-spacing:0.05em}
.hero-card-title{font-size:20px;color:#fff;font-weight:600;letter-spacing:-0.02em}
.hero-card-desc{font-size:13px;color:rgba(255,255,255,.5);line-height:1.4}

/* ===== SECTIONS ===== */
.section{padding:100px 0}
.section-dark{background:#000;color:#fff}
.section-light{background:#f5f5f7;color:#1d1d1f}
.section-title{font-size:clamp(32px,5vw,48px);font-weight:700;line-height:1.08;letter-spacing:-0.03em;margin-bottom:8px;text-align:center}
.section-sub{font-size:18px;color:rgba(255,255,255,.6);text-align:center;margin-bottom:56px;font-weight:400}
.section-light .section-sub{color:rgba(0,0,0,.5)}
.topic-header{text-align:center;margin-bottom:60px}
.topic-num{display:inline-block;font-size:13px;font-weight:600;color:#2997ff;letter-spacing:0.1em;text-transform:uppercase;margin-bottom:12px;padding:4px 14px;border:1px solid rgba(41,151,255,.3);border-radius:980px}
.sub-heading{font-size:28px;font-weight:600;letter-spacing:-0.02em;margin:64px 0 32px;text-align:center;line-height:1.14}

/* ===== RAG FLOW ===== */
.rag-flow{display:flex;align-items:flex-start;justify-content:center;gap:8px;flex-wrap:wrap;margin-bottom:64px;padding:40px 0}
.flow-step{background:#fff;border-radius:16px;padding:28px 20px;width:140px;text-align:center;position:relative;box-shadow:0 4px 24px rgba(0,0,0,.06);transition:transform .3s}
.flow-step:hover{transform:translateY(-6px)}
.flow-icon{font-size:32px;margin-bottom:8px}
.flow-num{position:absolute;top:-12px;right:-8px;width:28px;height:28px;background:#0071e3;color:#fff;border-radius:50%;font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center}
.flow-step h3{font-size:15px;font-weight:600;margin-bottom:6px;letter-spacing:-0.01em}
.flow-step p{font-size:12px;color:rgba(0,0,0,.55);line-height:1.4}
.flow-arrow{font-size:24px;color:rgba(0,0,0,.2);align-self:center;font-weight:300;padding-top:20px}

/* ===== WHY RAG ===== */
.rag-why{background:#fff;border-radius:20px;padding:48px;box-shadow:0 4px 30px rgba(0,0,0,.06)}
.rag-why h3{font-size:24px;font-weight:600;text-align:center;margin-bottom:32px;letter-spacing:-0.02em}
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.why-card{text-align:center;padding:20px 16px}
.why-icon{font-size:36px;margin-bottom:12px}
.why-card h4{font-size:17px;font-weight:600;margin-bottom:8px;letter-spacing:-0.01em}
.why-card p{font-size:13px;color:rgba(0,0,0,.6);line-height:1.5}

/* ===== EXPLAIN BLOCK ===== */
.explain-block{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:20px;padding:40px;margin-bottom:48px}
.section-light .explain-block{background:#fff;border-color:transparent;box-shadow:0 2px 20px rgba(0,0,0,.06)}
.explain-block h3{font-size:22px;font-weight:600;margin-bottom:12px;letter-spacing:-0.02em}
.explain-block p{font-size:16px;line-height:1.6;color:rgba(255,255,255,.75)}
.section-light .explain-block p{color:rgba(0,0,0,.65)}
.explain-block strong{color:#fff;font-weight:600}
.section-light .explain-block strong{color:#1d1d1f}

/* ===== COMPARE BOX ===== */
.compare-box{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:24px}
.compare-item{padding:24px;border-radius:12px}
.compare-bad{background:rgba(255,59,48,.08);border:1px solid rgba(255,59,48,.2)}
.compare-good{background:rgba(52,199,89,.08);border:1px solid rgba(52,199,89,.2)}
.compare-item h4{font-size:16px;font-weight:600;margin-bottom:12px}
.compare-bad h4{color:#ff3b30}
.compare-good h4{color:#34c759}
.compare-item li{font-size:14px;padding:4px 0;color:rgba(255,255,255,.65);padding-left:16px;position:relative}
.section-light .compare-item li{color:rgba(0,0,0,.6)}
.compare-item li::before{content:"•";position:absolute;left:0}

/* ===== PROCESS STEPS ===== */
.process-section{margin-bottom:48px}
.process-section h3{font-size:24px;font-weight:600;text-align:center;margin-bottom:32px;letter-spacing:-0.02em}
.process-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.p-step{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:28px 20px;text-align:center;transition:all .3s}
.p-step:hover{background:rgba(255,255,255,.1);transform:translateY(-4px)}
.p-step-n{width:36px;height:36px;background:#0071e3;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700;margin:0 auto 14px}
.p-step h4{font-size:16px;font-weight:600;margin-bottom:8px;color:#fff}
.p-step p{font-size:13px;color:rgba(255,255,255,.55);line-height:1.45}

/* ===== DIFFICULTY CARDS ===== */
.diff-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:48px}
.diff-card{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:20px;padding:32px 24px;transition:border-color .3s}
.diff-card:hover{border-color:rgba(41,151,255,.3)}
.diff-badge{display:inline-block;font-size:12px;font-weight:600;color:#ff9500;background:rgba(255,149,0,.12);padding:3px 10px;border-radius:6px;margin-bottom:12px}
.diff-card h4{font-size:20px;font-weight:600;margin-bottom:8px;color:#fff}
.diff-desc{font-size:14px;color:rgba(255,255,255,.5);line-height:1.5;margin-bottom:20px}
.solution{background:rgba(41,151,255,.06);border:1px solid rgba(41,151,255,.15);border-radius:12px;padding:20px}
.sol-label{font-size:11px;font-weight:600;color:#2997ff;letter-spacing:0.06em;text-transform:uppercase}
.solution h5{font-size:16px;font-weight:600;color:#fff;margin:6px 0 8px}
.solution p{font-size:13px;color:rgba(255,255,255,.6);line-height:1.5}
.metric{font-size:13px;color:#34c759;margin-top:12px;font-weight:500}

/* ===== STRATEGY CARDS ===== */
.strat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:48px}
.strat-card{background:#fff;border-radius:20px;padding:32px 24px;box-shadow:0 2px 20px rgba(0,0,0,.06)}
.strat-num{font-size:12px;font-weight:600;color:#0071e3;margin-bottom:12px;letter-spacing:0.05em}
.strat-card h4{font-size:20px;font-weight:600;margin-bottom:10px;letter-spacing:-0.02em}
.strat-card p{font-size:14px;color:rgba(0,0,0,.55);line-height:1.5;margin-bottom:16px}
.example-box{background:#f5f5f7;border-radius:12px;padding:20px;margin-bottom:12px}
.ex-before{font-size:13px;color:rgba(0,0,0,.5);margin-bottom:8px}
.ex-arrow{font-size:16px;color:#0071e3;text-align:center;margin:6px 0;font-weight:600}
.ex-after{font-size:13px;color:#1d1d1f;font-weight:500}
.ex-after p{font-size:13px;color:#1d1d1f;margin:4px 0;line-height:1.4}
.tech-note{font-size:12px;color:rgba(0,0,0,.4);font-style:italic}

/* ===== SPLIT DEMO ===== */
.split-demo{background:#fff;border-radius:20px;padding:40px;box-shadow:0 2px 20px rgba(0,0,0,.06);margin-bottom:48px}
.split-level{border-radius:12px;padding:16px}
.split-l1{background:rgba(0,113,227,.06);border:2px solid rgba(0,113,227,.2)}
.split-l2{background:rgba(52,199,89,.06);border:1px solid rgba(52,199,89,.2);margin:6px 0}
.split-tag{font-size:12px;font-weight:600;letter-spacing:0.02em}
.split-l1 > .split-tag{color:#0071e3}
.split-l2 .split-tag{color:#34c759}
.split-inner{margin-top:12px;display:flex;gap:8px}
.split-note{font-size:14px;color:rgba(0,0,0,.5);margin-top:20px;text-align:center;line-height:1.5}

/* ===== SEARCH STRATEGIES ===== */
.search-strats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:48px}
.ss-card{background:#fff;border-radius:16px;padding:28px 24px;box-shadow:0 2px 20px rgba(0,0,0,.06)}
.ss-card h4{font-size:18px;margin-bottom:10px}
.ss-card p{font-size:14px;color:rgba(0,0,0,.55);line-height:1.5}
.ss-card strong{color:#1d1d1f}

/* ===== STRUCT / AGENT ===== */
.struct-section{margin-bottom:48px}
.struct-card{background:#fff;border-radius:20px;padding:36px;box-shadow:0 2px 20px rgba(0,0,0,.06)}
.struct-card h4{font-size:20px;font-weight:600;margin-bottom:10px}
.struct-card > p{font-size:14px;color:rgba(0,0,0,.55);line-height:1.5;margin-bottom:20px}
.agent-flow{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap}
.agent{background:#f5f5f7;border-radius:12px;padding:20px;text-align:center;font-size:14px;font-weight:600;min-width:160px}
.agent small{font-weight:400;color:rgba(0,0,0,.5);font-size:12px}
.agent-arrow{font-size:20px;color:rgba(0,0,0,.2)}

/* ===== HALLUCINATION FLOW ===== */
.halluc-flow{display:flex;align-items:stretch;justify-content:center;gap:12px;flex-wrap:wrap;margin-bottom:48px}
.h-step{flex:1;min-width:160px;padding:28px 20px;border-radius:16px;text-align:center}
.h-basic{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.08)}
.h-best{background:rgba(41,151,255,.1);border:2px solid rgba(41,151,255,.4)}
.h-step h4{font-size:16px;font-weight:600;margin-bottom:8px}
.h-step p{font-size:13px;color:rgba(255,255,255,.55)}
.h-limit{font-size:12px;color:#ff453a;margin-top:12px}
.h-win{font-size:13px;color:#30d158;margin-top:12px;font-weight:600}
.h-arrow{font-size:24px;color:rgba(255,255,255,.2);align-self:center;font-weight:300}

/* ===== SCENE GRID ===== */
.scene-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-bottom:48px}
.scene-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.08);border-radius:20px;padding:32px 24px;transition:border-color .3s}
.scene-card:hover{border-color:rgba(41,151,255,.3)}
.scene-num{font-size:12px;color:#2997ff;font-weight:600;letter-spacing:0.05em;margin-bottom:10px}
.scene-card h4{font-size:18px;font-weight:600;margin-bottom:8px}
.scene-card p{font-size:14px;color:rgba(255,255,255,.55);line-height:1.5;margin-bottom:12px}
.scene-key{font-size:13px;color:#30d158;background:rgba(48,209,88,.06);padding:10px 14px;border-radius:8px;border:1px solid rgba(48,209,88,.15)}

/* ===== PAIN GRID ===== */
.pain-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:48px}
.pain-card{background:#fff;border-radius:16px;padding:28px 20px;text-align:center;box-shadow:0 2px 20px rgba(0,0,0,.06);transition:transform .3s}
.pain-card:hover{transform:translateY(-4px)}
.pain-num{display:inline-flex;width:32px;height:32px;background:#ff3b30;color:#fff;border-radius:50%;align-items:center;justify-content:center;font-size:14px;font-weight:700;margin-bottom:12px}
.pain-card h4{font-size:16px;font-weight:600;margin-bottom:8px;letter-spacing:-0.01em}
.pain-card p{font-size:13px;color:rgba(0,0,0,.5);line-height:1.45}

/* ===== MODAL COMPARE ===== */
.modal-compare{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:48px}
.mc-card{background:#fff;border-radius:16px;padding:28px 24px;text-align:center;box-shadow:0 2px 20px rgba(0,0,0,.06)}
.mc-basic{opacity:.8}
.mc-best{border:2px solid #0071e3;opacity:1}
.mc-card h4{font-size:17px;font-weight:600;margin-bottom:8px}
.mc-card p{font-size:14px;color:rgba(0,0,0,.55);margin-bottom:12px;line-height:1.4}
.mc-limit{font-size:12px;color:#ff3b30;background:rgba(255,59,48,.06);padding:8px 12px;border-radius:8px}
.mc-win{font-size:12px;color:#34c759;background:rgba(52,199,89,.06);padding:8px 12px;border-radius:8px;font-weight:600}

/* ===== MM FLOW ===== */
.mm-flow{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap;margin-bottom:48px}
.mm-step{background:#fff;border-radius:16px;padding:28px 20px;text-align:center;width:180px;box-shadow:0 2px 20px rgba(0,0,0,.06)}
.mm-n{width:36px;height:36px;background:#0071e3;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700;margin:0 auto 12px}
.mm-step p{font-size:13px;color:rgba(0,0,0,.6);line-height:1.45}
.mm-arrow{font-size:20px;color:rgba(0,0,0,.2)}

/* ===== TRAIN GRID ===== */
.train-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:48px}
.train-card{background:#fff;border-radius:16px;padding:32px 24px;text-align:center;box-shadow:0 2px 20px rgba(0,0,0,.06);transition:transform .3s}
.train-card:hover{transform:translateY(-4px)}
.train-icon{font-size:36px;margin-bottom:12px}
.train-card h4{font-size:16px;font-weight:600;margin-bottom:8px}
.train-card p{font-size:13px;color:rgba(0,0,0,.55);line-height:1.5}

/* ===== APP GRID ===== */
.app-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:48px}
.app-card{background:#fff;border-radius:16px;padding:28px 24px;box-shadow:0 2px 20px rgba(0,0,0,.06);transition:transform .3s}
.app-card:hover{transform:translateY(-4px)}
.app-card h4{font-size:17px;font-weight:600;margin-bottom:8px}
.app-card p{font-size:13px;color:rgba(0,0,0,.55);line-height:1.5}

/* ===== PAGE PREVIEW ===== */
.page-preview-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:48px}
.page-img{border-radius:12px;cursor:pointer;transition:transform .3s,box-shadow .3s;width:100%}
.page-img:hover{transform:scale(1.02);box-shadow:0 8px 40px rgba(0,0,0,.3)}

/* ===== GALLERY ===== */
.gallery-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.gallery-thumb{border-radius:8px;cursor:pointer;transition:all .3s;width:100%;aspect-ratio:auto;opacity:.8}
.gallery-thumb:hover{opacity:1;transform:scale(1.03)}

/* ===== LIGHTBOX ===== */
.lightbox{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.92);backdrop-filter:blur(20px);display:none;align-items:center;justify-content:center;z-index:2000;padding:40px}
.lightbox.active{display:flex}
.lightbox img{max-width:90vw;max-height:90vh;border-radius:8px}
.lb-close{position:absolute;top:20px;right:24px;background:rgba(255,255,255,.15);border:none;color:#fff;width:40px;height:40px;border-radius:50%;font-size:18px;cursor:pointer;transition:background .2s}
.lb-close:hover{background:rgba(255,255,255,.3)}

/* ===== TLDR BOX ===== */
.tldr-box{background:rgba(0,113,227,.06);border:1px solid rgba(0,113,227,.15);border-radius:12px;padding:20px 24px;margin-bottom:40px;font-size:15px;line-height:1.6;color:rgba(0,0,0,.7)}
.tldr-box strong{color:#0071e3}
.tldr-dark{background:rgba(41,151,255,.08);border-color:rgba(41,151,255,.2);color:rgba(255,255,255,.75)}
.tldr-dark strong{color:#2997ff}

/* ===== SECTION EXPLAIN ===== */
.section-explain{font-size:15px;color:rgba(255,255,255,.6);line-height:1.6;max-width:800px;margin:0 auto 28px;text-align:center}
.section-explain strong{color:#fff}
.section-light .section-explain{color:rgba(0,0,0,.55)}
.section-light .section-explain strong{color:#1d1d1f}

/* ===== VS TABLE (comparison) ===== */
.vs-table{margin:20px 0 28px;overflow-x:auto}
.vs-table table{width:100%;border-collapse:collapse;font-size:13px;line-height:1.5}
.vs-table th{background:rgba(255,255,255,.08);color:rgba(255,255,255,.7);padding:10px 14px;text-align:left;font-weight:600;border-bottom:1px solid rgba(255,255,255,.1)}
.vs-table td{padding:10px 14px;border-bottom:1px solid rgba(255,255,255,.06);color:rgba(255,255,255,.55)}
.tr-old td{opacity:.8}
.tr-new td{color:#2997ff;font-weight:500;background:rgba(41,151,255,.04)}
.section-light .vs-table th{background:rgba(0,0,0,.04);color:rgba(0,0,0,.6);border-color:rgba(0,0,0,.08)}
.section-light .vs-table td{color:rgba(0,0,0,.5);border-color:rgba(0,0,0,.06)}
.section-light .tr-new td{color:#0071e3;background:rgba(0,113,227,.04)}

/* ===== TECH DETAIL ===== */
.tech-detail{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:16px;padding:28px 24px;margin-bottom:40px}
.tech-detail h4{font-size:18px;font-weight:600;margin-bottom:8px}
.tech-detail-light{background:#fff;border-color:transparent;box-shadow:0 2px 20px rgba(0,0,0,.06)}
.plain-explain{font-size:14px;color:rgba(255,255,255,.5);font-style:italic;margin-bottom:16px}
.tech-detail-light .plain-explain{color:rgba(0,0,0,.45)}
.tech-steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-bottom:16px}
.ts{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.08);border-radius:12px;padding:16px}
.ts-light{background:#f5f5f7;border-color:transparent}
.ts-n{font-size:11px;font-weight:700;color:#2997ff;letter-spacing:0.06em;margin-bottom:6px}
.ts h5{font-size:14px;font-weight:600;margin-bottom:4px;color:#fff}
.ts-light h5,.tech-detail-light .ts h5{color:#1d1d1f}
.ts p{font-size:12px;color:rgba(255,255,255,.5);line-height:1.45}
.ts-light p,.tech-detail-light .ts p{color:rgba(0,0,0,.5)}
.tech-loss{font-size:13px;color:rgba(255,255,255,.5);margin-bottom:12px;padding:12px;background:rgba(255,255,255,.03);border-radius:8px}
.tech-loss strong{color:rgba(255,255,255,.7)}

/* ===== GLOSSARY NOTE ===== */
.glossary-note{font-size:13px;color:rgba(0,0,0,.5);background:rgba(0,0,0,.03);padding:10px 14px;border-radius:8px;margin-top:12px;line-height:1.5}
.glossary-note strong{color:rgba(0,0,0,.7)}
.section-dark .glossary-note{color:rgba(255,255,255,.5);background:rgba(255,255,255,.04)}
.section-dark .glossary-note strong{color:rgba(255,255,255,.7)}

/* ===== TWO COL EXPLAIN ===== */
.two-col-explain{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:16px}
.col-explain h4,.col-explain h5{font-size:15px;font-weight:600;margin-bottom:8px}
.col-explain p{font-size:14px;line-height:1.5;color:rgba(0,0,0,.55);margin-bottom:8px}
.section-dark .col-explain p{color:rgba(255,255,255,.55)}
.col-explain ul{padding-left:0}
.col-explain li{font-size:13px;padding:3px 0;color:rgba(0,0,0,.55);padding-left:14px;position:relative;line-height:1.4}
.col-explain li::before{content:"•";position:absolute;left:0}
.section-dark .col-explain li{color:rgba(255,255,255,.55)}

/* ===== TAG PILL / VS INLINE ===== */
.tag-pill{display:inline-block;font-size:11px;font-weight:600;color:#0071e3;background:rgba(0,113,227,.08);padding:2px 10px;border-radius:980px;margin:0 4px}
.tech-inline{font-size:13px;margin-top:16px;color:rgba(0,0,0,.6)}
.vs-inline{display:flex;flex-direction:column;gap:6px;margin-top:12px;font-size:13px}
.vs-old{color:rgba(0,0,0,.4);padding-left:14px;position:relative}
.vs-old::before{content:"✕";position:absolute;left:0;color:#ff3b30;font-size:11px}
.vs-new{color:#0071e3;font-weight:500;padding-left:14px;position:relative}
.vs-new::before{content:"✓";position:absolute;left:0;font-size:11px}

/* ===== STRAT FULL ===== */
.strat-full{grid-column:1/-1}
.strat-grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:48px}
.ex-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.ex-col{min-width:0}
.ex-label{font-size:11px;font-weight:600;color:#0071e3;margin-bottom:6px;letter-spacing:0.04em}
.ex-content{font-size:13px;line-height:1.5;color:rgba(0,0,0,.6)}
.ex-bad{color:#ff3b30;font-weight:500}
.ex-good{color:#34c759;font-weight:500}
.ex-note{font-size:12px;color:rgba(0,0,0,.4);margin-top:8px;font-style:italic}

/* ===== COT STEPS ===== */
.cot-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:16px 0 20px}
.cot-s{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.08);border-radius:12px;padding:16px;text-align:center}
.cot-n{width:28px;height:28px;background:#0071e3;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;margin:0 auto 8px}
.cot-s h6{font-size:14px;font-weight:600;margin-bottom:4px;color:#fff}
.cot-s p{font-size:12px;color:rgba(255,255,255,.5);line-height:1.4}

/* ===== SCENE DETAIL ===== */
.scene-detail{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:20px;padding:32px 28px;margin-bottom:24px}
.scene-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.scene-header h4{font-size:20px;font-weight:600}
.scene-detail p{font-size:14px;color:rgba(255,255,255,.6);line-height:1.5;margin-bottom:8px}
.scene-detail strong{color:rgba(255,255,255,.85)}
.scene-detail h5{font-size:15px;font-weight:600;margin:16px 0 8px;color:rgba(255,255,255,.9)}

/* ===== MINI STEPS ===== */
.mini-steps{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin:8px 0;font-size:13px;color:rgba(255,255,255,.5)}
.section-light .mini-steps{color:rgba(0,0,0,.5)}
.mini-s{background:rgba(41,151,255,.1);border:1px solid rgba(41,151,255,.2);padding:4px 12px;border-radius:8px;font-size:12px;font-weight:500;color:#2997ff}
.section-light .mini-s{background:rgba(0,113,227,.06);border-color:rgba(0,113,227,.15);color:#0071e3}

/* ===== INSTRUCT GRID ===== */
.instruct-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:16px}
.instruct-card{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:12px;padding:20px}
.instruct-card h5{font-size:15px;font-weight:600;margin-bottom:8px;color:#fff}
.instruct-card p{font-size:13px;color:rgba(255,255,255,.55);line-height:1.5;margin-bottom:6px}
.source-advantage{background:rgba(41,151,255,.06);border:1px solid rgba(41,151,255,.15);border-radius:8px;padding:14px;margin-top:10px}
.source-advantage strong{font-size:13px;color:#2997ff;display:block;margin-bottom:6px}
.source-advantage li{font-size:12px;color:rgba(255,255,255,.55);padding:2px 0;padding-left:14px;position:relative;line-height:1.4}
.source-advantage li::before{content:"•";position:absolute;left:0}

/* ===== FIVE GRID ===== */
.five-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:12px 0 16px}
.five-item{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:10px;padding:14px;text-align:center}
.five-item strong{font-size:13px;color:#2997ff;display:block;margin-bottom:4px}
.five-item p{font-size:11px;color:rgba(255,255,255,.45);line-height:1.4}

/* ===== TECH PATH ===== */
.tech-path{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:40px}
.tp-card{background:#fff;border-radius:16px;padding:28px 20px;box-shadow:0 2px 20px rgba(0,0,0,.06)}
.tp-n{font-size:12px;font-weight:600;color:#0071e3;margin-bottom:8px;letter-spacing:0.05em}
.tp-card h4{font-size:17px;font-weight:600;margin-bottom:4px}
.tp-card p{font-size:13px;color:rgba(0,0,0,.55);line-height:1.5;margin-bottom:6px}
.tp-card ul{padding-left:0;margin-top:8px}
.tp-card li{font-size:13px;color:rgba(0,0,0,.55);padding:3px 0;padding-left:14px;position:relative;line-height:1.4}
.tp-card li::before{content:"•";position:absolute;left:0}
.tp-card strong{color:#1d1d1f}

/* ===== APP DETAIL ===== */
.app-grid-detail{display:grid;gap:20px;margin-bottom:40px}
.app-card-detail{background:#fff;border-radius:20px;padding:32px 28px;box-shadow:0 2px 20px rgba(0,0,0,.06)}
.app-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.app-n{font-size:12px;font-weight:600;color:#0071e3;letter-spacing:0.05em}
.app-header h4{font-size:18px;font-weight:600}
.app-q{font-size:14px;color:#0071e3;font-weight:500;margin-bottom:8px}
.app-card-detail p{font-size:14px;color:rgba(0,0,0,.55);line-height:1.5;margin-bottom:6px}
.app-card-detail strong{color:#1d1d1f}
.app-card-detail h5{font-size:14px;font-weight:600;margin:12px 0 6px}

/* ===== EXPERT GRID ===== */
.expert-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:10px}
.expert{background:#f5f5f7;border-radius:10px;padding:14px}
.expert strong{font-size:13px;color:#0071e3;display:block;margin-bottom:4px}
.expert p{font-size:12px;color:rgba(0,0,0,.5);line-height:1.4;margin:0}

/* ===== MC DETAIL ===== */
.mc-detail{font-size:12px;color:rgba(0,0,0,.4);margin-bottom:8px;line-height:1.5}

/* ===== PAGE PREVIEW 4-col ===== */
.page-preview-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-top:48px}

/* ===== PROGRESS BAR ===== */
.progress-bar{position:fixed;top:0;left:0;height:3px;background:linear-gradient(90deg,#0071e3,#2997ff);z-index:1100;width:0;transition:width .15s linear}

/* ===== BACK TO TOP ===== */
.back-to-top{position:fixed;bottom:32px;right:32px;width:44px;height:44px;border-radius:50%;background:rgba(0,113,227,.9);color:#fff;border:none;font-size:20px;cursor:pointer;z-index:900;opacity:0;transform:translateY(20px);transition:opacity .3s,transform .3s,background .2s;backdrop-filter:blur(10px);box-shadow:0 4px 20px rgba(0,0,0,.2)}
.back-to-top.visible{opacity:1;transform:translateY(0)}
.back-to-top:hover{background:#0071e3;transform:translateY(-2px)}

/* ===== ANALOGY BANNER ===== */
.analogy-banner{display:flex;align-items:flex-start;gap:20px;background:linear-gradient(135deg,rgba(0,113,227,.06),rgba(52,199,89,.04));border:1px solid rgba(0,113,227,.12);border-radius:16px;padding:24px 28px;margin-bottom:40px}
.analogy-dark{background:linear-gradient(135deg,rgba(41,151,255,.08),rgba(48,209,88,.04));border-color:rgba(41,151,255,.18)}
.analogy-icon{font-size:40px;flex-shrink:0;line-height:1}
.analogy-text h3{font-size:16px;font-weight:600;margin-bottom:6px;color:#0071e3}
.analogy-dark .analogy-text h3{color:#2997ff}
.analogy-text p{font-size:14px;line-height:1.6;color:rgba(0,0,0,.6);margin:0}
.analogy-dark .analogy-text p{color:rgba(255,255,255,.65)}
.analogy-text strong{color:#1d1d1f}
.analogy-dark .analogy-text strong{color:#fff}

/* ===== PIPELINE DIAGRAM ===== */
.pipeline-diagram{background:#fff;border-radius:20px;padding:36px 32px;margin-bottom:40px;box-shadow:0 2px 24px rgba(0,0,0,.06)}
.pipeline{display:flex;flex-direction:column;gap:0;align-items:center}
.pipe-stage{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;position:relative;padding:20px 24px;border-radius:12px;width:100%}
.pipe-stage::before{content:attr(data-label);position:absolute;top:-10px;left:20px;font-size:11px;font-weight:600;letter-spacing:.04em;color:#fff;background:#0071e3;padding:2px 10px;border-radius:6px}
.pipe-stage-1{background:rgba(0,113,227,.04);border:1px solid rgba(0,113,227,.1)}
.pipe-stage-2{background:rgba(52,199,89,.04);border:1px solid rgba(52,199,89,.1)}
.pipe-stage-2::before{background:#34c759}
.pipe-connector{width:2px;height:28px;background:linear-gradient(180deg,rgba(0,113,227,.3),rgba(52,199,89,.3));position:relative}
.pipe-connector::after{content:'\2193';position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:16px;color:rgba(0,0,0,.3);background:#fff;padding:0 4px}
.pipe-node{display:flex;flex-direction:column;align-items:center;gap:4px;padding:12px 16px;border-radius:10px;background:#fff;border:1px solid rgba(0,0,0,.06);min-width:80px;transition:transform .2s,box-shadow .2s;cursor:default}
.pipe-node:hover{transform:translateY(-3px);box-shadow:0 4px 16px rgba(0,0,0,.1)}
.pipe-emoji{font-size:24px;line-height:1}
.pipe-node span:last-child{font-size:12px;font-weight:600;color:#1d1d1f}
.pipe-db{border-color:rgba(0,113,227,.2);background:rgba(0,113,227,.04)}
.pipe-ai{border-color:rgba(52,199,89,.2);background:rgba(52,199,89,.04)}
.pipe-arrow{font-size:18px;color:rgba(0,0,0,.2);font-weight:300}
.pipeline-note{text-align:center;font-size:13px;color:rgba(0,0,0,.45);margin-top:16px;line-height:1.5}
.pipeline-note strong{color:rgba(0,0,0,.65)}

/* ===== COLLAPSE PANEL ===== */
.collapse-panel{margin-bottom:24px;border-radius:16px;overflow:hidden}
.collapse-trigger{display:flex;align-items:center;justify-content:space-between;width:100%;padding:18px 24px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:16px;cursor:pointer;font-size:16px;font-weight:600;color:#2997ff;list-style:none;transition:background .2s}
.section-light .collapse-trigger{background:rgba(0,113,227,.04);border-color:rgba(0,113,227,.1);color:#0071e3}
.collapse-trigger:hover{background:rgba(255,255,255,.1)}
.section-light .collapse-trigger:hover{background:rgba(0,113,227,.08)}
.collapse-trigger::-webkit-details-marker{display:none}
.collapse-icon{font-size:20px;font-weight:400;transition:transform .3s}
details[open] .collapse-icon{transform:rotate(45deg)}
.collapse-content{padding:20px 0 0}
.collapse-content .tech-detail{margin-bottom:0}

/* ===== TAB COMPONENT ===== */
.tab-container{margin-bottom:40px}
.tab-nav{display:flex;gap:6px;border-bottom:2px solid rgba(255,255,255,.08);padding-bottom:0;margin-bottom:24px;overflow-x:auto;-webkit-overflow-scrolling:touch}
.section-light .tab-nav{border-color:rgba(0,0,0,.06)}
.tab-btn{padding:12px 20px;border:none;background:transparent;color:rgba(255,255,255,.5);font-size:14px;font-weight:500;cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-2px;transition:all .2s;white-space:nowrap;border-radius:8px 8px 0 0}
.section-light .tab-btn{color:rgba(0,0,0,.4)}
.tab-btn:hover{color:rgba(255,255,255,.8);background:rgba(255,255,255,.04)}
.section-light .tab-btn:hover{color:rgba(0,0,0,.7);background:rgba(0,0,0,.03)}
.tab-btn.active{color:#2997ff;border-bottom-color:#2997ff;background:rgba(41,151,255,.06)}
.section-light .tab-btn.active{color:#0071e3;border-bottom-color:#0071e3;background:rgba(0,113,227,.04)}
.tab-panel{display:none}
.tab-panel.active{display:block;animation:fadeUp .4s ease}

/* ===== FOOTER ===== */
.footer{background:#000;color:rgba(255,255,255,.4);text-align:center;padding:40px 24px;font-size:13px;border-top:1px solid rgba(255,255,255,.06)}
.footer-small{font-size:11px;margin-top:6px;color:rgba(255,255,255,.25)}

/* ===== ANIMATIONS ===== */
@keyframes fadeUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}

.animate-on-scroll{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.animate-on-scroll.visible{opacity:1;transform:translateY(0)}

/* ===== RESPONSIVE ===== */
@media(max-width:834px){
  .hero-cards{grid-template-columns:repeat(2,1fr)}
  .why-grid{grid-template-columns:repeat(2,1fr)}
  .diff-grid{grid-template-columns:1fr}
  .strat-grid{grid-template-columns:1fr}
  .strat-grid-2{grid-template-columns:1fr}
  .process-steps{grid-template-columns:repeat(2,1fr)}
  .scene-grid{grid-template-columns:1fr}
  .pain-grid{grid-template-columns:repeat(2,1fr)}
  .modal-compare{grid-template-columns:1fr}
  .search-strats{grid-template-columns:1fr}
  .train-grid{grid-template-columns:1fr}
  .app-grid{grid-template-columns:1fr}
  .halluc-flow{flex-direction:column;align-items:center}
  .h-arrow{transform:rotate(90deg)}
  .split-inner{flex-direction:column}
  .rag-flow{flex-direction:column;align-items:center}
  .flow-arrow{transform:rotate(90deg);padding:0}
  .two-col-explain{grid-template-columns:1fr}
  .instruct-grid{grid-template-columns:1fr}
  .five-grid{grid-template-columns:repeat(3,1fr)}
  .cot-steps{grid-template-columns:repeat(2,1fr)}
  .tech-path{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .ex-row{grid-template-columns:1fr}
  .analogy-banner{flex-direction:column;gap:12px}
  .pipe-stage{flex-direction:column;gap:6px}
  .pipe-arrow{transform:rotate(90deg)}
  .tab-nav{gap:4px}
  .tab-btn{padding:10px 14px;font-size:13px}
}
@media(max-width:480px){
  .hero-cards{grid-template-columns:1fr}
  .why-grid{grid-template-columns:1fr}
  .pain-grid{grid-template-columns:1fr}
  .process-steps{grid-template-columns:1fr}
  .five-grid{grid-template-columns:repeat(2,1fr)}
  .cot-steps{grid-template-columns:1fr}
  .nav-links{display:none;position:absolute;top:48px;left:0;right:0;background:rgba(0,0,0,.95);padding:20px;flex-direction:column;gap:16px;text-align:center}
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .nav-left-group{gap:10px}
  .nav-home-btn{padding:4px 10px;font-size:11px}
  .nav-logo{font-size:13px}
  .section{padding:60px 0}
  .rag-why{padding:24px}
  .agent-flow{flex-direction:column}
  .agent-arrow{transform:rotate(90deg)}
  .mm-flow{flex-direction:column;align-items:center}
  .mm-arrow{transform:rotate(90deg)}
  .scene-detail{padding:20px 16px}
  .collapse-trigger{font-size:14px;padding:14px 18px}
  .pipeline-diagram{padding:24px 16px}
  .back-to-top{bottom:20px;right:20px;width:40px;height:40px;font-size:18px}
}