:root{--blue:#2469ed;--ink:#172d49;--muted:#64758d;--line:#e3eaf3;--pale:#edf4fd;--teal:#13847b;--bg:#fbfcfe}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;color:var(--ink);font:15px/1.8 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}button,a{touch-action:manipulation}button{border:0;background:none;color:inherit}a:focus-visible,button:focus-visible,[tabindex]:focus-visible{outline:3px solid #8fb8ff;outline-offset:4px}h1,h2,h3,p{margin:0}h1,h2,h3{letter-spacing:-.025em;line-height:1.4}h1{font-size:clamp(38px,4.1vw,61px);font-weight:650;line-height:1.38}h2{font-size:clamp(29px,3vw,43px);font-weight:620}h3{font-size:21px;font-weight:600}p{color:var(--muted)}.container{max-width:1240px;width:calc(100% - 100px);margin:auto}.section{padding:100px 0;scroll-margin-top:10px}.topbar{height:76px;display:flex;align-items:center;justify-content:space-between;gap:25px;padding:0 42px;background:#fbfcfeF5;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.brand{display:flex;align-items:center;font-size:21px;font-weight:650;gap:10px;white-space:nowrap;line-height:1}.brand img{width:28px;height:28px}.brand span{font-size:12px;font-weight:400;color:var(--muted);border-left:1px solid #cfd9e5;padding-left:12px;margin-left:2px}.topbar nav{display:flex;gap:27px;color:var(--muted);font-size:13px}.topbar nav a:hover,.topbar nav a.active{color:var(--blue)}.nav-cta{font-size:12px;border:1px solid #cad9f2;border-radius:22px;padding:7px 16px;color:var(--blue);white-space:nowrap}.eyebrow{font-size:11px;letter-spacing:.15em;color:var(--blue);font-weight:600;text-transform:uppercase;margin-bottom:21px}.edition{display:inline-flex;align-items:center;gap:8px;border:1px solid #dce7f7;padding:3px 12px;border-radius:20px;color:#57759c;font-size:11px;margin-bottom:21px}.dot{height:5px;width:5px;background:#2469ed;border-radius:50%}.hero{display:grid;grid-template-columns:1.35fr 1fr;gap:36px;padding-top:75px;padding-bottom:68px;min-height:800px;align-items:center;overflow:hidden}.hero-copy{position:relative;z-index:1}.hero h1 span{color:var(--blue)}.hero-desc{font-size:17px;line-height:1.95;margin-top:23px}.hero-actions{display:flex;align-items:center;gap:19px;margin-top:35px}.btn{display:inline-flex;justify-content:center;align-items:center;gap:26px;padding:12px 21px;border-radius:8px;font-weight:500;font-size:14px}.btn.primary{background:var(--blue);color:white;box-shadow:0 6px 17px #2469ed18}.btn:hover{filter:brightness(.96)}.btn.text{color:var(--blue);padding-left:0;padding-right:0;gap:8px}.byline{display:flex;align-items:center;gap:11px;margin-top:44px;font-size:12px}.avatar{width:34px;height:34px;display:grid;place-items:center;border-radius:50%;background:#e1ecfc;color:var(--blue);font-size:15px}.byline strong,.byline small{display:block}.byline strong{font-weight:550}.byline small,.small{color:var(--muted);font-size:10px;line-height:1.7}.byline-rule{height:25px;width:1px;background:var(--line);margin:0 4px}.hero-visual{position:relative;height:644px;background:linear-gradient(148deg,#f2f7ff,#eaf2fd);border-radius:35px}.native-phone{position:absolute;width:267px;height:580px;right:35px;top:42px;border-radius:34px;overflow:hidden;border:7px solid #fff;box-shadow:0 18px 40px #163c6c0d;background:#fff;transform:rotate(3deg)}.native-phone img{width:100%;height:auto;display:block}.visual-caption{position:absolute;top:48px;left:27px;font-size:11px;line-height:1.9;color:#879ab5;writing-mode:vertical-rl;letter-spacing:2px}.visual-caption strong{font-weight:500;color:#607da2}.visual-note{position:absolute;display:flex;align-items:center;gap:12px;left:-22px;bottom:112px;background:#fff;padding:17px 22px;border-radius:14px;box-shadow:0 8px 30px #163c6c0b;font-size:13px;font-weight:550;border:1px solid #e1eafa}.visual-note>span{font-size:25px;color:var(--blue)}.visual-note small{display:block;font-size:10px;color:var(--muted);font-weight:400;margin-top:2px}.visual-foot{position:absolute;bottom:6px;left:33px;color:#6c86a9;font-size:9px}.scope-strip{border-block:1px solid var(--line);background:#fff}.scope-strip>.container{padding:24px 0;display:flex;align-items:center;justify-content:space-between;font-size:11px;color:var(--muted);gap:25px}.scope-strip strong{font-size:16px;font-weight:500;color:var(--ink);white-space:nowrap}.scope-strip b{font-weight:400;color:#a7bad2;margin:0 15px}.section-intro{max-width:700px;margin-bottom:42px}.section-intro.wide{max-width:840px}.section-intro>p:not(.eyebrow){margin-top:20px;font-size:15px;max-width:660px}.questions-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:40px}.questions-grid article{border-top:1px solid #b9cee9;padding-top:21px}.number{font-size:11px;letter-spacing:.05em;color:#6e92bf;font-weight:500}.questions-grid h3{margin:19px 0 12px;font-size:20px}.questions-grid p{font-size:13px;line-height:1.9}.questions-grid a{display:inline-block;color:var(--blue);font-size:12px;margin-top:20px}.thesis-note{display:flex;gap:24px;padding-top:27px;border-top:1px solid var(--line);margin-top:38px;font-size:12px}.thesis-note strong{white-space:nowrap;color:var(--blue);font-weight:500}.experience{background:#edf3fc;border-block:1px solid #e7edf5}.experience-grid{display:grid;grid-template-columns:1fr 412px;gap:85px;align-items:start}.experience-copy{padding-top:18px;max-width:560px}.lead{font-size:15px;margin-top:20px}.account-line{display:flex;gap:31px;padding:23px 0;border-bottom:1px solid #d6e2f3;margin-bottom:16px}.account-line>span{color:var(--muted);font-size:11px}.account-line strong{display:block;color:var(--ink);font-size:16px;font-weight:500;margin-top:5px}.story-list{display:flex;flex-direction:column}.story{display:grid;grid-template-columns:32px 1fr 20px;gap:10px;align-items:center;text-align:left;padding:17px 15px 17px 0;border-bottom:1px solid #dbe6f5;border-radius:0;font-size:14px;transition:.15s}.story>span:first-child{color:#89a1bf;font-size:12px}.story.active{background:white;border-radius:10px;padding-left:15px;margin-left:-15px;box-shadow:0 4px 16px #28568e05;color:var(--blue);border-color:transparent}.story small{display:block;color:var(--muted);font-size:11px;margin-top:2px}.story>span:last-child{color:#8da7c9}.story-context{min-height:80px;padding:20px 0;font-size:12px;line-height:1.85;color:#537397}.story-context strong{color:var(--blue);font-weight:500}.experience-links{display:flex;gap:27px;color:var(--blue);font-size:12px}.experience-links button{padding:0}.micro{font-size:10px;color:#7b8da4;line-height:1.9;margin-top:20px}.interactive-device{position:relative;background:white;border-radius:40px;padding:10px 10px 9px;box-shadow:0 16px 60px #24466e12;border:1px solid #dce5f2;width:412px;max-width:100%;scroll-margin-top:90px}.device-head{height:31px;display:flex;align-items:center;gap:6px;justify-content:center;font-size:8px;color:#8598b0;letter-spacing:1px}.device-dot{width:4px;height:4px;border-radius:50%;background:var(--teal)}.device-clock{margin-left:14px;color:#526980}.interactive-device iframe{display:block;width:390px;max-width:100%;height:792px;border:0;border-radius:22px;background:#f4f7fc}.device-bottom{width:102px;height:4px;border-radius:3px;background:#d2ddea;margin:12px auto 3px}.feature-layout{display:grid;grid-template-columns:260px 1fr;gap:55px;align-items:start}.feature-menu{display:flex;flex-direction:column;border-left:1px solid var(--line)}.feature-menu button{text-align:left;font-size:13px;padding:12px 15px 12px 20px;position:relative;color:var(--muted);line-height:1.4}.feature-menu button span{font-size:10px;color:#91a5c0;display:inline-block;margin-right:12px}.feature-menu button[aria-selected=true]{color:var(--blue);background:#eff5ff;font-weight:500}.feature-menu button[aria-selected=true]:before{content:'';position:absolute;left:-1px;top:0;bottom:0;width:2px;background:var(--blue)}.feature-detail{outline:none;min-height:670px}.feature-head{display:flex;align-items:center;gap:12px;margin-bottom:15px}.feature-head .number{font-size:13px;color:var(--blue)}.feature-tag{font-size:10px;border:1px solid #dbe6f5;padding:2px 9px;border-radius:12px;color:#6c84a4}.feature-detail h3{font-size:28px;line-height:1.5}.feature-question{font-size:15px;color:var(--muted);padding:15px 0 25px;border-bottom:1px solid var(--line)}.feature-block{display:grid;grid-template-columns:96px 1fr;gap:14px;margin-top:24px;font-size:13px}.feature-block>strong{font-size:11px;font-weight:550;color:var(--blue);padding-top:2px}.feature-block p+p{margin-top:9px}.feature-path{padding:13px 16px;background:#f0f5fc;border-radius:7px;color:#4b729f;font-size:12px;margin-top:20px}.feature-fact{margin-top:23px;background:white;border-left:2px solid #8ab2ec;padding:15px 20px;font-size:13px;line-height:1.8}.feature-fact span{display:block;font-size:10px;color:#8b9eb8;letter-spacing:1px;margin-bottom:4px}.feature-actions{display:flex;align-items:center;gap:22px;margin-top:25px}.feature-actions .btn{font-size:12px;padding:10px 17px}.feature-actions>button:not(.btn){font-size:12px;color:var(--muted)}.architecture{background:#f5f8fd;border-block:1px solid #e6edf7}.journey-tabs{display:flex;align-items:center;justify-content:space-around;background:white;border:1px solid #e1eaf6;border-radius:16px;max-width:950px;margin:0 auto;padding:28px 0}.journey-tabs>span{position:relative;text-align:center;font-weight:500;font-size:17px;min-width:95px}.journey-tabs small{display:block;font-size:11px;font-weight:400;color:var(--muted);margin-top:5px}.journey-tabs .ai-tab{color:var(--blue)}.ai-tab video{display:block;width:44px;height:44px;margin:-15px auto 0;mix-blend-mode:multiply}.context-flow{display:flex;align-items:start;gap:25px;margin-top:45px}.context-flow>div{flex:1}.flow-label{font-size:10px;letter-spacing:.1em;color:var(--blue)}.context-flow h3{font-size:17px;margin:7px 0 10px}.context-flow p{font-size:12px}.flow-arrow{color:#a1b8d6;margin-top:40px}.architecture-foot{margin-top:30px;padding-top:20px;border-top:1px solid #dce6f3;color:#6d84a4;font-size:10px;letter-spacing:.02em}.film-layout{display:grid;grid-template-columns:1fr 440px;gap:50px;align-items:center}.film-player{border-radius:16px;background:#ecf2fa;padding:24px 24px 12px;min-height:560px;display:flex;flex-direction:column;align-items:center}.film-player video{display:block;max-width:100%;width:260px;height:564px;background:#f4f7fc;border-radius:12px;box-shadow:0 10px 22px #172d4912}.film-caption{font-size:10px;color:#768fae;margin-top:14px}.chapter{width:100%;text-align:left;border-bottom:1px solid var(--line);padding:23px 0;display:grid;grid-template-columns:45px 1fr 20px;gap:15px}.chapter .time{color:var(--blue);font-size:11px;padding-top:3px}.chapter h3{font-size:17px;margin-bottom:6px}.chapter p{font-size:12px}.chapter .play{color:#94abc7;align-self:center}.chapter.active h3{color:var(--blue)}.film-bottom{display:flex;justify-content:space-between;margin-top:19px;font-size:11px;color:var(--muted)}.film-bottom a{color:var(--blue)}.rules-section{padding-top:40px}.rule-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:33px}.rule-grid article{padding-top:20px;border-top:1px solid #bad0eb}.rule-grid h3{font-size:20px;margin-top:16px}.rule-grid p{font-size:11px;line-height:1.85;margin-top:20px}.math{display:flex;align-items:center;gap:9px;font-variant-numeric:tabular-nums;margin-top:29px;flex-wrap:wrap;font-size:18px}.math small{display:block;font-size:9px;color:var(--muted);margin-top:3px}.math b{color:#b7c6da;font-weight:400;align-self:flex-start}.blue{color:var(--blue)}.day-comparison{display:flex;gap:22px;margin-top:22px;font-size:11px;color:var(--muted)}.day-comparison b{font-size:29px;color:var(--blue);font-weight:500;margin-right:3px}.day-comparison small{display:block;font-size:9px}.stress-example{margin-top:22px;display:flex;align-items:center;justify-content:space-between}.stress-example>b{color:var(--blue);font-size:35px;font-weight:500;font-variant-numeric:tabular-nums}.stress-example small{font-size:11px;margin-left:8px;color:var(--muted)}.stress-example>span{font-size:11px;color:var(--muted)}.stress-example strong{font-size:20px;display:block;color:var(--blue);font-weight:500}.validation{background:#f2f6fc;border-block:1px solid #e0e9f5}.evidence-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}.evidence-grid article{padding:25px;background:white;border:1px solid #e5edf8;border-radius:10px}.status{display:inline-block;font-size:10px;border-radius:20px;padding:3px 10px;line-height:1.6}.status.checked{color:#317e80;background:#edf7f5}.status.open{color:#7b829a;background:#f0f2f7}.evidence-grid h3{font-size:22px;line-height:1.5;margin:20px 0 14px}.evidence-grid p{font-size:12px;line-height:1.9}.evidence-grid a{display:inline-block;font-size:11px;color:var(--blue);margin-top:12px}.research-table{overflow:auto;margin-top:45px}table{border-collapse:collapse;width:100%;min-width:750px;font-size:12px}th,td{text-align:left;vertical-align:top;border-bottom:1px solid #dce6f3;padding:18px 18px 18px 0}th{font-size:11px;color:#738aa8;font-weight:500}td{color:#5f7592}td:first-child{width:22%;color:var(--ink);white-space:nowrap}td b{display:inline-block;color:var(--blue);margin-right:12px;font-weight:500}.roadmap{display:grid;grid-template-columns:repeat(3,1fr);gap:45px;border-top:1px solid #d3e0f2}.roadmap article{position:relative;padding-top:37px}.roadmap-dot{width:9px;height:9px;border:2px solid #cadbf1;border-radius:50%;position:absolute;top:-5px;background:white}.roadmap-dot.done{background:var(--blue);border-color:var(--blue)}.roadmap .eyebrow{margin-bottom:12px}.roadmap h3{font-size:20px}.roadmap p:not(.eyebrow){font-size:12px;margin:14px 0 20px;line-height:1.9}.decision-note{margin-top:65px;background:#edf4ff;border-radius:12px;padding:34px 40px;display:grid;grid-template-columns:1fr 1.4fr;gap:10px 40px}.decision-note .eyebrow{grid-column:1/-1;margin-bottom:0}.decision-note h3{font-size:24px;max-width:300px}.decision-note ol{margin:0;padding-left:20px;color:#567397;font-size:13px;line-height:2.2}.footer{background:white;border-top:1px solid var(--line);padding:45px 0}.footer>.container{display:flex;justify-content:space-between;gap:30px}.footer p{font-size:10px;margin-top:20px;line-height:2}.footer-links{display:flex;flex-direction:column;gap:10px;font-size:11px;color:var(--muted)}.footer-links button{text-align:left;padding:0}.print-only{display:none}@media(min-width:1500px){.hero{gap:70px}.hero-visual{margin-left:10px}}@media(max-width:1100px){.container{width:calc(100% - 60px)}.topbar{padding-inline:25px}.topbar nav{gap:15px}.brand span{display:none}.hero{gap:20px}.hero h1{font-size:43px}.hero-visual{height:620px}.native-phone{right:15px;width:250px;height:547px}.visual-caption{left:14px}.hero-actions{gap:12px}.btn{font-size:12px;padding:12px 16px}.byline{flex-wrap:wrap}.scope-strip>.container>span:last-child{display:none}.experience-grid{gap:40px;grid-template-columns:1fr 392px}.interactive-device{width:392px}.interactive-device iframe{height:768px}.feature-layout{gap:30px;grid-template-columns:240px 1fr}.film-layout{grid-template-columns:1fr 1fr;gap:40px}.rule-grid{gap:25px}.math{font-size:15px;gap:7px}}@media(max-width:800px){.topbar nav{display:none}.topbar{height:65px}.container{width:calc(100% - 40px)}.hero{grid-template-columns:1fr;padding-top:45px;gap:40px;padding-bottom:40px}.hero h1{font-size:clamp(34px,6vw,49px)}.hero-desc{font-size:15px}.hero-visual{width:100%;max-width:510px;margin:auto;height:530px}.native-phone{width:225px;height:489px;top:20px;right:20%}.visual-caption{left:35px;top:30px}.visual-note{left:15px;bottom:100px}.visual-foot{bottom:5px;left:25px}.byline{margin-top:30px}.scope-strip>.container{display:block;padding:17px 0}.scope-strip strong{display:block;margin-top:3px;font-size:13px}.scope-strip b{margin:0 9px}.section{padding:65px 0}.section-intro{margin-bottom:32px}.section-intro>p:not(.eyebrow){font-size:13px}.eyebrow{margin-bottom:15px;font-size:10px}.questions-grid{grid-template-columns:1fr;gap:25px}.questions-grid h3{margin-top:10px}.questions-grid a{margin-top:12px}.thesis-note{gap:15px}.experience-grid{grid-template-columns:1fr;gap:30px}.experience-copy{max-width:none}.interactive-device{margin:auto;width:412px}.interactive-device iframe{height:min(790px,84vh)}.story-list{display:grid;grid-template-columns:1fr 1fr;gap:10px}.story{padding:13px;border:1px solid #d8e3f3;border-radius:9px;font-size:12px;grid-template-columns:20px 1fr;gap:8px}.story>span:last-child{display:none}.story small{font-size:10px}.story.active{margin:0;padding:13px;box-shadow:none}.story-context{min-height:75px}.feature-layout{display:block}.feature-menu{display:flex;flex-direction:row;overflow:auto;border:0;padding-bottom:10px;gap:7px;margin-bottom:25px;scroll-snap-type:x mandatory}.feature-menu button{white-space:nowrap;flex:none;border:1px solid #dfe8f6;border-radius:7px;padding:10px 12px;font-size:11px;scroll-snap-align:start}.feature-menu button[aria-selected=true]:before{display:none}.feature-menu button span{margin-right:5px}.feature-detail{min-height:0}.feature-detail h3{font-size:25px}.feature-block{grid-template-columns:75px 1fr;gap:10px;font-size:12px}.journey-tabs{padding:20px 2px}.journey-tabs>span{min-width:0;font-size:13px}.journey-tabs small{font-size:9px}.ai-tab video{width:35px;height:35px;margin-top:-7px}.context-flow{flex-direction:column;gap:15px;margin-top:27px}.flow-arrow{margin:0;transform:rotate(90deg);align-self:center}.architecture-foot{font-size:9px}.film-layout{grid-template-columns:1fr;gap:20px}.film-player{min-height:0}.film-player video{height:564px}.chapter{padding:17px 0}.film-bottom{gap:20px;font-size:10px}.film-bottom span{max-width:210px}.rule-grid,.evidence-grid,.roadmap{grid-template-columns:1fr;gap:28px}.rule-grid article{padding-top:20px}.rule-grid h3 br{display:none}.math{font-size:21px;gap:15px;margin-top:20px}.day-comparison{gap:32px}.rule-grid p{font-size:12px;margin-top:15px}.evidence-grid article{padding:23px}.evidence-grid h3 br{display:none}.evidence-grid h3{font-size:21px;margin-top:12px}.roadmap{border-top:0;gap:0}.roadmap article{border-left:1px solid #d4e1f2;padding:0 0 35px 28px}.roadmap-dot{left:-5px;top:5px}.roadmap p:not(.eyebrow){margin-top:10px}.decision-note{padding:25px;grid-template-columns:1fr;gap:14px;margin-top:20px}.decision-note h3{font-size:23px;max-width:none}.decision-note ol{font-size:12px}.footer>.container{flex-direction:column}.footer .brand span{display:inline;font-size:11px}.footer-links{flex-direction:row;gap:18px;flex-wrap:wrap}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}.ai-tab video{display:none}}@media print{html{scroll-behavior:auto}body{font-size:11px;background:white}.topbar,.hero-actions,.experience,.feature-layout,.film-layout,.film-bottom,.footer-links,.nav-cta{display:none}.container{width:100%;max-width:none}.section{padding:28px 0;break-inside:avoid;border:0}.hero{min-height:0;padding:20px 0;display:block}.hero-visual{display:none}.hero h1{font-size:36px}.hero-desc{font-size:14px}.hero .byline{margin-top:20px}.scope-strip>.container{padding:14px 0}h2{font-size:25px}.section-intro{margin-bottom:20px}.questions-grid,.rule-grid,.evidence-grid,.roadmap{display:block}.questions-grid article,.rule-grid article,.evidence-grid article,.roadmap article{break-inside:avoid;padding:15px 0}.feature-question{padding-bottom:12px}.feature-block{margin-top:10px}.feature-fact{margin-top:10px}.print-only{display:block}.print-only>article{break-inside:avoid;padding-bottom:25px;border-bottom:1px solid #ddd;margin-bottom:25px}.feature-actions{display:none}.print-only h3{font-size:22px}.research-table{overflow:visible}table{min-width:0;font-size:9px}th,td{padding:8px}td:first-child{white-space:normal}.decision-note{margin-top:20px}.footer{padding:20px 0}.journey-tabs{padding:20px}.roadmap-dot{display:none}.film-layout+div{display:none}.status{font-size:9px}}
.experience-grid>*,.feature-layout>*,.film-layout>*{min-width:0}@media(max-width:800px){.experience-grid{grid-template-columns:minmax(0,1fr)}.interactive-device{width:min(412px,100%)}.interactive-device iframe{width:100%}}

.film-player{position:relative}.film-start{position:absolute;left:50%;top:44%;transform:translateX(-50%);background:var(--blue);color:white;border-radius:24px;padding:11px 22px;white-space:nowrap;font-size:13px;box-shadow:0 6px 22px #24466e22}.film-start[hidden]{display:none}.film-start:disabled{opacity:.75;cursor:wait}
