@charset "UTF-8";
:root{--space:#07090d;--white:#f5f6f8;--ink:#19212c;--muted:#687181;--ice:#c8e8ff;--violet:#b8a7ee;--line:rgba(255,255,255,.14);--ease:cubic-bezier(.2,.8,.2,1);--header:104px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--space);color:var(--white);font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;-webkit-font-smoothing:antialiased}body.light-page{background:var(--white);color:var(--ink)}button,input,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit;text-decoration:none}button{color:inherit}button:focus-visible,a:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #81b9ee;outline-offset:5px}button:disabled{cursor:default}::selection{background:#bdd7f2;color:#172235}h1,h2,h3,p{margin:0}h1,h2{font-weight:550;letter-spacing:-.055em}h3{font-weight:600}p{line-height:1.85}svg{display:block}button svg{width:19px;height:19px}.icon{fill:none;stroke:currentColor;stroke-width:1.65;stroke-linecap:round;stroke-linejoin:round}button{border:0}button,a{touch-action:manipulation}.skip-link{position:fixed;top:-60px;left:20px;z-index:110;background:#fff;color:#000;padding:12px}.skip-link:focus{top:15px}
.site-header{position:fixed;z-index:50;inset:0 0 auto;display:flex;align-items:center;justify-content:space-between;gap:24px;height:var(--header);padding:0 4vw;color:white;transition:background .5s,color .5s,border-color .5s; border-bottom:1px solid transparent}.site-header.scrolled{background:rgba(7,9,13,.8);backdrop-filter:blur(24px);border-color:var(--line)}.light-page .site-header{color:var(--ink)}.light-page .site-header.scrolled{background:rgba(245,246,248,.88);border-color:rgba(25,33,44,.09)}.brand{display:flex;align-items:center;gap:11px;flex-shrink:0}.brand>svg{width:37px;height:37px;fill:none;stroke:currentColor;stroke-width:1.3}.brand>svg circle{fill:currentColor;stroke:none}.brand b{font-size:18px;letter-spacing:.07em;display:block;font-weight:550}.brand small{display:block;font-size:10px;letter-spacing:.12em;opacity:.65;margin-top:5px}.main-nav{display:flex;padding:5px;background:rgba(255,255,255,.065);border:1px solid rgba(255,255,255,.13);border-radius:40px;backdrop-filter:blur(20px)}.main-nav a{font-size:12px;padding:13px 17px;border-radius:25px;white-space:nowrap;opacity:.6;transition:background .3s,opacity .3s}.main-nav a:hover{opacity:1}.main-nav a[aria-current=page]{background:rgba(255,255,255,.13);opacity:1}.light-page .main-nav{background:rgba(25,33,44,.035);border-color:rgba(25,33,44,.1)}.light-page .main-nav a[aria-current=page]{background:#fff;box-shadow:0 3px 15px #18213c0c}.header-actions{display:flex;align-items:center;gap:9px;flex-shrink:0}.icon-button{width:39px;height:39px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.08);transition:background .2s}.icon-button:hover{background:rgba(255,255,255,.17)}.light-page .icon-button{background:rgba(25,33,44,.05)}.light-page .icon-button:hover{background:rgba(25,33,44,.1)}.presentation-button{border-radius:25px;font-size:12px;white-space:nowrap;background:white;color:#12171f;padding:14px 20px;transition:box-shadow .3s}.presentation-button:hover{box-shadow:0 0 30px #c8e8ff30}.light-page .presentation-button{background:var(--ink);color:#fff}.presentation-button[aria-pressed=true]{background:#c8e8ff;color:#172235}.menu-button{display:none}.reading-progress{position:fixed;top:calc(var(--header) - 1px);left:0;right:0;height:2px;z-index:52;pointer-events:none}.reading-progress i{display:block;background:linear-gradient(90deg,#b8a7ee,#c8e8ff);height:100%;transform:scaleX(0);transform-origin:left;opacity:.75}
.page{animation:chapter-enter .8s var(--ease)}@keyframes chapter-enter{from{opacity:0;filter:blur(8px);transform:translateY(18px)}to{opacity:1;filter:blur(0);transform:translateY(0)}}::view-transition-old(root){animation:.35s ease-out both page-out}::view-transition-new(root){animation:.65s var(--ease) both page-in}@keyframes page-out{to{opacity:0;filter:blur(8px);transform:scale(.985)}}@keyframes page-in{from{opacity:0;filter:blur(10px);transform:scale(1.02)}}
.hero{min-height:100svh;position:relative;overflow:hidden;isolation:isolate;padding:190px 6vw 65px;display:flex;align-items:center}.hero-image{position:absolute;inset:-3%;z-index:-3;background:url('assets/intelligence-portal.png') center/cover;transform:translate3d(calc(var(--mx,0)*-9px),calc(var(--my,0)*-6px),0) scale(1.03);will-change:transform;animation:world-breathe 20s ease-in-out infinite alternate}.hero:before{content:"";position:absolute;inset:0;z-index:-2;background:linear-gradient(90deg,#05070bd6 0%,#05070b66 38%,transparent 66%),linear-gradient(0deg,#07090d 0%,transparent 23%)}.hero:after{content:"";position:absolute;inset:0;z-index:-1;background:radial-gradient(ellipse at 70% 45%,#c8e8ff09,transparent 62%)}@keyframes world-breathe{to{transform:translate3d(calc(var(--mx,0)*-9px),calc(var(--my,0)*-6px),0) scale(1.075)}}.hero-copy{width:min(590px,56%);padding-bottom:65px;position:relative}.chapter-marker{display:flex;align-items:center;gap:10px;font-size:12px;letter-spacing:.08em;color:#abb3c1;margin-bottom:30px}.chapter-marker i{width:5px;height:5px;background:#dbeeff;border-radius:50%;box-shadow:0 0 12px #a5d9ff}.hero h1{font-size:clamp(66px,7.7vw,114px);line-height:1.15;letter-spacing:-.045em;text-shadow:0 3px 40px #0005}.hero-subtitle{font-size:20px;margin-top:27px;letter-spacing:.02em;color:#e0e3e9}.hero-description{font-size:14px;color:#9fa6b4;margin-top:18px;max-width:355px;line-height:1.85}.hero-buttons{display:flex;align-items:center;gap:22px;margin-top:36px}.button{display:inline-flex;align-items:center;justify-content:center;gap:17px;padding:16px 23px;border-radius:30px;background:#fff;color:#12171f;font-size:13px;transition:transform .3s,box-shadow .3s}.button:hover{transform:translateY(-3px);box-shadow:0 12px 35px #c8e8ff20}.button .icon{width:17px;height:17px}.button.dark{background:var(--ink);color:#fff}.button.outline{background:transparent;color:inherit;border:1px solid #ffffff30}.light-page .button.outline{border-color:#19212c30}.text-link{display:inline-flex;align-items:center;gap:9px;font-size:13px;border-bottom:1px solid transparent;padding-bottom:4px}.text-link:hover{border-color:currentColor}.hero-note{position:absolute;right:6vw;bottom:90px;width:230px;backdrop-filter:blur(20px);padding:23px 24px;border:1px solid #ffffff22;border-radius:24px;background:linear-gradient(140deg,#f3f6ff17,#8cacdc05);overflow:hidden}.hero-note .mini-orbit{width:39px;height:39px;margin-bottom:19px;border:1px solid #dae9ff80;border-radius:50%;position:relative}.mini-orbit:after{content:"";position:absolute;inset:6px -9px;transform:rotate(-35deg);border:1px solid #dae9ff80;border-radius:50%}.hero-note h3{font-size:19px;font-weight:450;margin-bottom:8px}.hero-note p{font-size:11px;color:#a7b1c0;line-height:1.8}.hero-bottom{position:absolute;left:6vw;right:6vw;bottom:28px;display:flex;align-items:center;justify-content:space-between;font-size:10px;color:#838a98;letter-spacing:.08em}.scroll-cue{display:flex;align-items:center;gap:11px}.scroll-cue svg{width:14px;height:22px;animation:cue 2s ease-in-out infinite}@keyframes cue{50%{transform:translateY(5px)}}.particle-canvas{position:absolute;inset:0;width:100%;height:100%;z-index:-1;pointer-events:none;opacity:.65}
.section{padding:105px max(6vw,24px)}.section-inner{max-width:1200px;margin:0 auto}.light-section{background:var(--white);color:var(--ink)}.dark-section{background:var(--space);color:var(--white)}.section-heading{max-width:720px;margin-bottom:55px}.section-heading.center{text-align:center;margin:0 auto 64px}.section-heading h2{font-size:clamp(34px,4.8vw,66px);line-height:1.23}.section-heading p{font-size:17px;color:var(--muted);margin-top:22px;max-width:580px}.section-heading.center p{margin-left:auto;margin-right:auto}.dark-section .section-heading p{color:#949eaf}.small-label{display:block;font-size:12px;color:var(--muted);margin-bottom:18px}.dark-section .small-label{color:#a4b0c2}.route-bridge{padding:75px 6vw;text-align:center;position:relative;background:#0d1119;overflow:hidden}.route-bridge h3{font-size:clamp(26px,3.3vw,44px);font-weight:450;letter-spacing:-.03em;margin-bottom:15px}.route-bridge p{font-size:14px;color:#929cad;margin-bottom:29px}.route-bridge:before{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(ellipse at 50% 100%,#7997dd10,transparent 65%)}.chapter-footer{display:flex;align-items:center;justify-content:space-between;padding:28px 6vw;background:#07090d;color:#8b94a4;border-top:1px solid #ffffff10;gap:20px;font-size:11px}.chapter-footer .text-link{font-size:11px}.footer-links{display:flex;gap:22px}.chapter-footer .footer-note{max-width:600px;line-height:1.8}
.outcome-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:50px}.outcome{padding-top:26px;border-top:1px solid #ccd1d9}.outcome-number{font-size:13px;color:#8794a5}.outcome h3{font-size:26px;font-weight:500;margin:20px 0 15px}.outcome p{font-size:14px;color:#727c8a}.outcome-illustration{height:140px;display:flex;align-items:center;justify-content:center;margin-top:28px}.outcome-illustration svg{width:180px;height:140px;stroke:#647991;fill:none;stroke-width:1.2}.journey-list{display:flex;flex-direction:column;margin-top:38px}.journey-row{display:grid;grid-template-columns:90px 1.1fr 1.2fr 120px 32px;align-items:center;padding:27px 0;border-top:1px solid #ffffff16;gap:20px;transition:padding .3s,background .3s}.journey-row:hover{padding-left:16px;padding-right:16px;background:#ffffff04}.journey-row:last-child{border-bottom:1px solid #ffffff16}.journey-row .number{font-size:38px;font-weight:300;color:#4e5a6f}.journey-row h3{font-size:22px;font-weight:450}.journey-row p{font-size:13px;color:#8b95a6}.journey-row .time{font-size:12px;color:#bac2ce}.journey-row .icon{width:22px;height:22px}
.chapter-hero{padding:175px 6vw 80px;min-height:510px;position:relative;overflow:hidden}.chapter-hero .chapter-marker{color:#7d8795}.chapter-hero h1{font-size:clamp(52px,6.2vw,84px);line-height:1.18;max-width:820px}.chapter-hero p{font-size:18px;color:#687181;max-width:560px;margin-top:25px}.chapter-hero .chapter-number{position:absolute;right:7vw;top:143px;font-size:200px;line-height:1;font-weight:350;color:#1d293007;letter-spacing:-.08em}.chapter-hero.split{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:20px}.chapter-hero.dark-hero{background:#07090d;color:#fff}.dark-hero .chapter-marker{color:#8897ad}.dark-hero p{color:#97a2b5}.dark-hero .chapter-number{color:#ffffff05}
.model-universe{position:relative;width:440px;height:350px;margin:0 auto;isolation:isolate}.universe-halo{position:absolute;left:50%;top:50%;width:280px;height:280px;transform:translate(-50%,-50%);border:1px solid #bdcce65c;border-radius:50%;box-shadow:0 0 60px #bfcee633,inset 0 0 70px #fff;animation:halo-glow 5s ease-in-out infinite alternate}.universe-halo:before,.universe-halo:after{content:"";position:absolute;inset:26px -43px;border:1px solid #c7b3ea55;border-radius:50%;transform:rotate(-28deg)}.universe-halo:after{transform:rotate(40deg);inset:-19px 36px}.universe-core{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:128px;height:128px;border-radius:50%;background:radial-gradient(circle at 34% 25%,white,#e3ebf7 35%,#91a5c38a 68%,#eef4ff 88%);box-shadow:inset -8px -10px 22px #6481b94d,0 15px 35px #6885aa32,0 0 100px #ffffffa8;display:grid;place-items:center;font-size:20px;color:#465974;z-index:2}.floating-name{position:absolute;padding:12px 20px;border:1px solid #ffffff99;background:#ffffffac;backdrop-filter:blur(15px);box-shadow:0 6px 20px #8a9bb315;border-radius:30px;font-size:13px;animation:float 5s ease-in-out infinite alternate}.floating-name:nth-last-child(4){top:10px;left:70px}.floating-name:nth-last-child(3){right:10px;top:110px;animation-delay:-2s}.floating-name:nth-last-child(2){bottom:12px;left:160px;animation-delay:-4s}.floating-name:nth-last-child(1){left:0;bottom:90px;animation-delay:-1s}@keyframes float{to{transform:translateY(-12px)}}@keyframes halo-glow{to{box-shadow:0 0 80px #b4c5e344,inset 0 0 70px #fff}}
.models-section{padding-top:38px}.model-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.model-button{background:#fff;text-align:left;border-radius:20px;padding:27px;border:1px solid transparent;transition:border-color .3s,transform .3s,box-shadow .3s}.model-button:hover{transform:translateY(-5px);box-shadow:0 16px 45px #263f6e0a}.model-button[aria-pressed=true]{border-color:#94b2d4;box-shadow:0 4px 28px #233d6110}.model-monogram{height:39px;width:39px;display:grid;place-items:center;color:var(--model-color,#6a82a8);font-size:26px;font-weight:600;margin-bottom:29px}.model-monogram svg{width:38px;height:38px}.model-button h3{font-size:21px;margin-bottom:7px}.model-button p{font-size:11px;color:#87909e}.model-arrow{float:right;color:#9ca6b5;font-size:22px;margin-top:17px}.model-detail{margin-top:27px;border-radius:24px;background:#e9edf3;display:grid;grid-template-columns:1fr 1.25fr;padding:37px 42px;gap:50px;min-height:230px;animation:chapter-enter .45s var(--ease)}.model-detail h3{font-size:32px;font-weight:500;margin-bottom:14px}.model-detail p{font-size:14px;color:#657184}.model-detail ul{padding-left:20px;margin:0 0 22px;display:grid;gap:14px;font-size:14px;line-height:1.7;color:#657184}.model-detail .text-link{color:#386389}.source-note{color:#7c8797;font-size:11px;line-height:1.85;margin-top:25px}.era-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}.era{border-top:1px solid #ffffff22;padding-top:23px}.era b{display:block;font-size:13px;color:#a8b6cc;font-weight:400;margin-bottom:22px}.era h3{font-size:23px;font-weight:450;margin-bottom:12px}.era p{color:#8d98ab;font-size:13px;line-height:1.85}.era-visual{height:145px;display:flex;align-items:center;justify-content:center;margin:14px 0 18px}.era-visual svg{width:180px;height:130px;fill:none;stroke:#9eb9db;stroke-width:1.2}.selection-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:30px}.selection-item{border-top:1px solid #d5dbe4;padding-top:20px}.selection-item h3{font-size:19px;margin-bottom:14px}.selection-item p{font-size:13px;color:#7a8594}
.stack-scene{height:370px;position:relative;perspective:1000px;width:430px;margin:0 auto}.stack-plane{position:absolute;top:calc(45px + var(--layer)*62px);left:50%;width:265px;height:118px;transform:translateX(-50%) rotateX(53deg) rotateZ(-25deg);background:linear-gradient(120deg,#cbe8ff14,#ffffff03);border:1px solid #cbe8ff44;border-radius:18px;box-shadow:0 10px 28px #0004,inset 0 1px #ffffff22;backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center;gap:12px;transition:transform .6s,box-shadow .6s;animation:stack-float 5s ease-in-out infinite alternate;animation-delay:calc(var(--layer)*-.6s)}.stack-plane span{transform:rotateZ(25deg) rotateX(-12deg);font-size:16px;letter-spacing:.1em;color:#b9cfe9}.stack-plane:nth-child(1){border-color:#ded6ff80;background:linear-gradient(120deg,#b8a7ee2b,#ffffff03)}.stack-plane:nth-child(2){border-color:#c8e8ff80}.stack-plane:nth-child(4){background:#8cacdb0b}.stack-glow{position:absolute;inset:100px 40px;background:#9bbae21a;filter:blur(55px);border-radius:50%}@keyframes stack-float{to{transform:translateX(-50%) translateY(-12px) rotateX(53deg) rotateZ(-25deg)}}
.concept-layout{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:start}.concept-selector{display:flex;flex-direction:column;gap:0}.concept-choice{display:grid;grid-template-columns:52px 1fr 22px;align-items:center;gap:12px;padding:23px 0;text-align:left;background:transparent;border-bottom:1px solid #d6dbe3}.concept-choice .number{color:#aeb7c4;font-size:12px}.concept-choice strong{font-size:22px;font-weight:450}.concept-choice small{display:block;color:#8b95a5;font-size:11px;margin-top:7px}.concept-choice[aria-pressed=true] strong{color:#3a668c}.concept-choice .icon{width:19px;height:19px;color:#a2adba}.concept-display{position:sticky;top:140px;border-radius:27px;background:linear-gradient(145deg,#e1e9f4,#e9e5f0);min-height:380px;padding:45px;display:flex;flex-direction:column;justify-content:center;animation:chapter-enter .5s var(--ease)}.concept-display .concept-symbol{font-size:40px;margin-bottom:35px;color:#8199b5}.concept-display h3{font-size:34px;margin-bottom:15px;font-weight:500}.concept-display p{font-size:16px;color:#64748c}.concept-display .example{margin-top:28px;padding-top:20px;border-top:1px solid #a9bad13f;font-size:13px;color:#8792a4}.task-flow{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}.flow-step{position:relative;border:1px solid #ffffff18;border-radius:18px;padding:26px 20px;background:#ffffff03;transition:background .6s,border-color .6s}.flow-step.active{background:#c8e8ff10;border-color:#c8e8ff75}.flow-step:not(:last-child):after{content:"→";position:absolute;right:-16px;top:45%;color:#8a9caf}.flow-step .flow-number{font-size:11px;color:#6e819c;margin-bottom:26px}.flow-step h3{font-size:18px;margin-bottom:9px;font-weight:450}.flow-step p{font-size:12px;color:#94a1b7}.flow-controls{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-top:28px}.flow-controls p{font-size:12px;color:#8f9aab}.contrast-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.contrast-box{padding:38px;border-radius:24px;background:white}.contrast-box.featured{background:#e5edf6}.contrast-box h3{font-size:24px;margin-bottom:18px}.contrast-box p{font-size:16px;color:#6a778b}.contrast-box .small-label{margin-bottom:12px}
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