:root {
  --navy: #07164a;
  --navy-2: #0c225f;
  --blue: #326bff;
  --blue-soft: #edf4ff;
  --cyan: #22c4cc;
  --coral: #f56c60;
  --yellow: #ffd487;
  --ink: #0a1947;
  --body: #53627f;
  --line: #dfe7f2;
  --white: #fff;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: #fff; font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, sans-serif; font-size: 16px; line-height: 1.65; -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.container { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }
.skip-link { position: fixed; z-index: 1000; left: 16px; top: -80px; padding: 10px 16px; background: white; border-radius: 8px; transition: top .2s; }
.skip-link:focus { top: 16px; }

.site-header { position: fixed; z-index: 50; width: 100%; top: 0; border-bottom: 1px solid transparent; transition: background .25s, border-color .25s, box-shadow .25s; }
.site-header.scrolled { background: rgba(255,255,255,.92); border-color: rgba(20,50,95,.1); box-shadow: 0 8px 32px rgba(11,28,72,.06); backdrop-filter: blur(18px); }
.nav-shell { width: min(var(--max), calc(100% - 48px)); margin: auto; height: 80px; display: flex; align-items: center; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 800; letter-spacing: .02em; font-size: 18px; }
.brand img { width: 40px; height: 40px; border-radius: 11px; }
.desktop-nav { display: flex; gap: 38px; margin-left: auto; margin-right: 40px; }
.desktop-nav a { color: #41516f; font-size: 15px; transition: color .2s; }
.desktop-nav a:hover { color: var(--blue); }
.nav-download { padding: 10px 20px; border: 1px solid rgba(7,22,74,.22); border-radius: 999px; font-weight: 700; font-size: 14px; transition: background .2s, color .2s, border-color .2s; }
.nav-download:hover { background: var(--navy); color: white; border-color: var(--navy); }
.menu-button, .mobile-nav { display: none; }

.hero { position: relative; overflow: hidden; min-height: 820px; padding: 150px 0 90px; background: linear-gradient(145deg,#f7fbff 0%,#f2f7ff 56%,#eefcfc 100%); }
.hero-grid { position: absolute; inset: 0; opacity: .35; background-image: linear-gradient(rgba(42,92,160,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(42,92,160,.08) 1px,transparent 1px); background-size: 64px 64px; mask-image: linear-gradient(to bottom,black,transparent 88%); }
.hero-glow { position: absolute; border-radius: 50%; filter: blur(1px); pointer-events: none; }
.glow-one { width: 560px; height: 560px; background: radial-gradient(circle,rgba(50,107,255,.18),transparent 68%); right: 0; top: 40px; }
.glow-two { width: 360px; height: 360px; background: radial-gradient(circle,rgba(34,196,204,.18),transparent 70%); left: -120px; bottom: -80px; }
.hero-layout { position: relative; display: grid; grid-template-columns: .96fr 1.04fr; align-items: center; gap: 70px; }
.eyebrow, .section-index { margin: 0 0 22px; color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.eyebrow { display: flex; align-items: center; gap: 10px; }
.eyebrow span { width: 30px; height: 2px; background: var(--cyan); }
h1,h2,h3,p { margin-top: 0; }
h1 { margin-bottom: 26px; font-size: clamp(52px,5.5vw,76px); line-height: 1.11; letter-spacing: -.045em; font-weight: 850; }
h1 em { color: var(--blue); font-style: normal; }
.headline-line { display:block; white-space:nowrap; }
.no-break { white-space:nowrap; }
.hero-lead { max-width: 570px; margin-bottom: 34px; color: var(--body); font-size: 18px; line-height: 1.85; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.button { min-height: 54px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 0 24px; border-radius: 14px; font-weight: 750; transition: transform .2s, box-shadow .2s, background .2s; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: white; background: var(--navy); box-shadow: 0 14px 35px rgba(7,22,74,.22); }
.button-primary:hover { box-shadow: 0 18px 40px rgba(7,22,74,.3); }
.button-primary svg { width: 20px; fill: none; stroke: white; stroke-width: 1.7; }
.button-ghost { border: 1px solid rgba(7,22,74,.17); background: rgba(255,255,255,.55); }
.button-ghost span { color: var(--blue); font-size: 20px; }
.download-note { margin: 15px 0 0; color: #7b89a3; font-size: 13px; }

.hero-visual { position: relative; height: 640px; display: grid; place-items: center; }
.orbit { position: absolute; border: 1px solid rgba(50,107,255,.2); border-radius: 50%; }
.orbit-one { width: 510px; height: 510px; animation: spin 20s linear infinite; }
.orbit-one:after { content:""; position:absolute; width:11px; height:11px; background:var(--cyan); border-radius:50%; top:58px; right:78px; box-shadow:0 0 0 7px rgba(34,196,204,.12); }
.orbit-two { width: 410px; height: 410px; border-style: dashed; border-color: rgba(50,107,255,.14); animation: spin 30s linear reverse infinite; }
.phone { position: relative; z-index: 2; width: 302px; height: 622px; border: 9px solid #081743; border-radius: 45px; background: white; box-shadow: 0 38px 70px rgba(7,22,74,.28), inset 0 0 0 1px rgba(255,255,255,.3); transform: rotate(2deg); overflow: hidden; }
.hero-app-shot { width:100%; height:100%; object-fit:cover; object-position:top center; }
.phone-bar { height: 34px; display: flex; align-items: center; justify-content: space-between; padding: 0 21px; background: #f8fbff; font-size: 9px; font-weight: 800; }
.phone-bar i { width: 62px; height: 18px; background: #071126; border-radius: 12px; }
.phone-bar b { font-size: 10px; }
.phone-screen { min-height: calc(100% - 34px); padding: 17px 17px 0; background: linear-gradient(160deg,#f5f9ff,#fff 65%); }
.app-topline { display: flex; justify-content: space-between; align-items: center; }
.app-topline img { width: 108px; height: auto; }
.avatar-dot { width: 30px; height: 30px; display: grid; place-items:center; background:#e8f3ff; border:2px solid white; box-shadow:0 4px 10px rgba(7,22,74,.12); border-radius:50%; color:var(--blue); font-size:11px; font-weight:800; }
.app-kicker { margin: 21px 0 3px; color:#8793a9; font-size: 10px; }
.phone-screen h2 { margin: 0; font-size: 23px; letter-spacing: -.03em; }
.app-tabs { display:flex; gap:16px; margin:19px 0 14px; color:#8a96aa; font-size:10px; }
.app-tabs .active { color:var(--blue); font-weight:800; position:relative; }
.app-tabs .active:after { content:""; position:absolute; height:2px; width:18px; left:0; bottom:-6px; border-radius:2px; background:var(--blue); }
.app-course { display:grid; grid-template-columns:44px 1fr auto; align-items:center; gap:10px; padding:13px 11px; margin-bottom:10px; background:white; border:1px solid #e6ecf5; border-radius:15px; box-shadow:0 8px 22px rgba(24,55,110,.07); }
.app-course.primary-card { color:white; background:linear-gradient(135deg,#0d2b76,#326bff); border:0; box-shadow:0 13px 28px rgba(50,107,255,.24); }
.course-icon { width:40px; height:40px; display:grid; place-items:center; background:rgba(255,255,255,.16); border-radius:11px; }
.course-icon.mint { background:#e6fbf7; }
.course-icon svg { width:24px; fill:none; stroke:currentColor; stroke-width:1.7; }
.mint svg { stroke:#15988e; }
.app-course small,.app-course strong,.app-course p { display:block; }
.app-course small { opacity:.72; font-size:8px; }
.app-course strong { margin:2px 0; font-size:11px; }
.app-course p { margin:0; opacity:.7; font-size:8px; }
.app-course > span { font-size:15px; }
.phone-progress { height:4px; margin: -16px 25px 16px 67px; background:#e9eef6; border-radius:4px; overflow:hidden; }
.phone-progress span { display:block; width:var(--progress); height:100%; background:var(--cyan); }
.app-nav { position:absolute; left:17px; right:17px; bottom:18px; display:flex; justify-content:space-around; padding:11px 8px; background:rgba(255,255,255,.92); border:1px solid #e7edf5; border-radius:18px; box-shadow:0 10px 26px rgba(11,36,80,.12); }
.app-nav span { display:grid; place-items:center; color:#99a4b7; font-size:13px; }
.app-nav span:first-child { color:var(--blue); }
.app-nav b { font-size:8px; margin-top:2px; }
.float-card { position:absolute; z-index:3; background:rgba(255,255,255,.92); backdrop-filter:blur(14px); border:1px solid rgba(255,255,255,.9); box-shadow:0 18px 44px rgba(19,47,99,.16); }
.score-card { top:95px; right:5px; width:130px; padding:16px; border-radius:19px; }
.score-card span { display:block; color:#77869f; font-size:10px; }
.score-card strong { display:block; margin:3px 0; color:var(--navy); font-size:31px; line-height:1.1; }
.score-card strong small { font-size:11px; }
.score-card i { color:#158676; font-size:9px; font-style:normal; background:#e7f8f4; padding:3px 7px; border-radius:8px; }
.model-card { bottom:95px; left:4px; display:flex; align-items:center; gap:11px; padding:13px 16px; border-radius:18px; }
.model-icon { width:36px; height:36px; display:grid; place-items:center; background:#e6f9fa; color:#119da4; border-radius:11px; font-size:19px; }
.model-card strong,.model-card small { display:block; }
.model-card strong { font-size:11px; }
.model-card small { color:#8290a7; font-size:8px; }
@keyframes spin { to { transform:rotate(360deg); } }

.signal-strip { background:var(--navy); color:white; }
.signals { min-height:78px; display:flex; align-items:center; justify-content:space-between; color:rgba(255,255,255,.82); font-weight:650; font-size:14px; letter-spacing:.06em; }
.signals i { width:4px; height:4px; background:var(--cyan); border-radius:50%; box-shadow:0 0 0 6px rgba(34,196,204,.1); }
.section { padding:130px 0; }
.section-heading { display:flex; align-items:end; justify-content:space-between; gap:60px; margin-bottom:62px; }
.section-heading h2,.courses-copy h2,.download-copy h2 { margin:0; font-size:clamp(38px,4.2vw,58px); line-height:1.2; letter-spacing:-.04em; }
.section-heading > p { max-width:440px; margin:0 0 5px; color:var(--body); font-size:17px; }
.section-index { margin-bottom:16px; }
.feature-grid { display:grid; grid-template-columns:1.35fr 1fr 1fr; gap:18px; }
.feature-card { position:relative; min-height:315px; overflow:hidden; isolation:isolate; padding:30px; border:1px solid var(--line); border-radius:26px; background:white; transition:transform .25s,box-shadow .25s; }
.feature-card:after { content:""; position:absolute; z-index:1; inset:0; pointer-events:none; background:linear-gradient(to bottom,rgba(255,255,255,.08) 0%,rgba(255,255,255,.6) 53%,rgba(255,255,255,.98) 82%); }
.feature-card:hover { transform:translateY(-5px); box-shadow:0 20px 55px rgba(17,46,91,.1); }
.feature-large { grid-row:span 2; min-height:648px; color:white; background:linear-gradient(150deg,#0a1d58,#1243a9); border:0; display:flex; flex-direction:column; }
.feature-large:after { background:linear-gradient(to bottom,rgba(7,22,74,.06) 0%,rgba(7,22,74,.28) 45%,rgba(7,22,74,.92) 78%); }
.feature-number { position:absolute; z-index:3; right:25px; top:22px; color:#a7b2c5; font-size:12px; font-weight:700; }
.feature-large .feature-number { color:rgba(255,255,255,.48); }
.feature-art { position:absolute; z-index:0; inset:0; width:100%; height:100%; object-fit:cover; opacity:.2; pointer-events:none; }
.feature-large .feature-art { width:100%; height:100%; inset:0; object-fit:cover; opacity:.2; }
.feature-symbol { position:relative; z-index:3; width:58px; height:58px; display:grid; place-items:center; margin-bottom:94px; padding:12px; border:1px solid rgba(50,107,255,.14); border-radius:17px; background:rgba(232,240,255,.9); box-shadow:0 10px 28px rgba(30,70,140,.08); }
.feature-symbol img { width:100%; height:100%; object-fit:contain; }
.feature-symbol.coral { background:rgba(255,240,237,.92); border-color:rgba(245,108,96,.15); }
.feature-symbol.yellow { background:rgba(255,244,216,.94); border-color:rgba(210,150,24,.14); }
.feature-symbol.mint { background:rgba(232,248,246,.94); border-color:rgba(18,141,136,.14); }
.feature-large .feature-symbol { margin-bottom:0; background:rgba(240,246,255,.94); }
.feature-card h3 { margin-bottom:10px; font-size:23px; }
.feature-card p { margin:0; color:var(--body); font-size:15px; }
.feature-card:not(.feature-large) h3,.feature-card:not(.feature-large) p { position:relative; z-index:3; }
.feature-large .feature-copy { position:relative; z-index:3; margin-top:auto; max-width:420px; padding-bottom:125px; }
.feature-large h3 { font-size:32px; }
.feature-large p { color:rgba(255,255,255,.7); }
.pulse-chart { position:absolute; z-index:2; left:0; right:0; bottom:0; height:150px; opacity:.75; background:linear-gradient(to top,rgba(34,196,204,.12),transparent); }
.pulse-chart svg { width:100%; height:100%; }
.pulse-chart path { fill:none; stroke:#55e4e7; stroke-width:2.5; filter:drop-shadow(0 0 9px rgba(85,228,231,.8)); }

.courses { color:white; background:var(--navy); overflow:hidden; }
.courses-layout { display:grid; grid-template-columns:.95fr 1.05fr; gap:70px; align-items:center; }
.section-index.light { color:#5be1dc; }
.courses-intro { max-width:470px; margin:28px 0 34px; color:rgba(255,255,255,.63); }
.course-tabs { display:flex; flex-direction:column; max-width:320px; border-top:1px solid rgba(255,255,255,.15); }
.course-tab { padding:17px 4px; text-align:left; color:rgba(255,255,255,.52); border:0; border-bottom:1px solid rgba(255,255,255,.15); background:transparent; cursor:pointer; transition:color .2s,padding .2s; }
.course-tab:after { content:"→"; float:right; opacity:0; }
.course-tab.active { padding-left:14px; color:white; font-weight:700; border-left:3px solid var(--cyan); }
.course-tab.active:after { opacity:1; }
.course-panel { min-height:570px; padding:44px; border:1px solid rgba(255,255,255,.14); border-radius:32px; background:linear-gradient(145deg,rgba(255,255,255,.1),rgba(255,255,255,.04)); box-shadow:0 35px 80px rgba(0,0,0,.18); }
.course-panel-top { display:grid; grid-template-columns:1fr 148px; align-items:center; gap:20px; margin-bottom:35px; }
.course-category { color:#64e4df; font-size:11px; font-weight:800; letter-spacing:.14em; }
.course-panel h3 { margin:8px 0 10px; font-size:31px; }
.course-panel p { margin:0; color:rgba(255,255,255,.58); font-size:14px; }
.course-badge { width:138px; height:138px; overflow:hidden; background:white; border-radius:25px; box-shadow:0 18px 35px rgba(0,0,0,.2); }
.course-badge img { width:100%; height:100%; object-fit:cover; transition:opacity .18s; }
.lesson-list { list-style:none; padding:0; margin:0; border-top:1px solid rgba(255,255,255,.14); }
.lesson-list li { display:grid; grid-template-columns:38px 1fr auto; align-items:center; padding:19px 0; border-bottom:1px solid rgba(255,255,255,.14); }
.lesson-list span { color:#56dcd9; font-size:12px; font-weight:800; }
.lesson-list strong { font-size:15px; }
.lesson-list em { color:rgba(255,255,255,.5); font-size:11px; font-style:normal; }
.course-meta { display:flex; gap:20px; flex-wrap:wrap; margin-top:25px; color:rgba(255,255,255,.58); font-size:11px; }

.section-heading.compact { max-width:850px; }
.journey-grid { position:relative; display:grid; grid-template-columns:repeat(4,1fr); gap:36px; }
.journey-grid:before { content:""; position:absolute; left:1%; right:1%; top:61px; height:1px; background:linear-gradient(90deg,var(--blue),var(--cyan)); opacity:.35; }
.journey-step { position:relative; }
.journey-step > span { color:#8592aa; font-size:11px; font-weight:800; }
.step-dot { position:relative; z-index:2; width:17px; height:17px; margin:33px 0 30px; background:white; border:4px solid var(--blue); border-radius:50%; box-shadow:0 0 0 8px #edf3ff; }
.journey-step:nth-child(even) .step-dot { border-color:var(--cyan); box-shadow:0 0 0 8px #e9fafa; }
.journey-step h3 { margin-bottom:10px; font-size:25px; }
.journey-step p { color:var(--body); font-size:14px; }

.download { padding:20px 0 110px; }
.download-card { position:relative; min-height:500px; display:flex; align-items:center; overflow:hidden; padding:70px 80px; color:white; background:linear-gradient(135deg,#153f9e 0%,#326bff 55%,#18aeb5 130%); border-radius:36px; }
.download-ring { position:absolute; width:520px; height:520px; right:-80px; border:1px solid rgba(255,255,255,.2); border-radius:50%; box-shadow:0 0 0 65px rgba(255,255,255,.045),0 0 0 130px rgba(255,255,255,.03); }
.download-copy { position:relative; z-index:2; max-width:620px; }
.download-copy p:not(.section-index) { margin:22px 0 30px; color:rgba(255,255,255,.72); }
.button-light { color:var(--navy); background:white; box-shadow:0 12px 30px rgba(7,22,74,.18); }
.download-device { position:absolute; right:90px; bottom:-190px; width:240px; height:490px; overflow:hidden; border:8px solid #071641; border-radius:38px; box-shadow:0 25px 55px rgba(1,10,38,.34); transform:rotate(5deg); background:white; }
.download-device img { width:100%; height:100%; object-fit:cover; }

footer { padding:40px 0; background:#050f32; color:rgba(255,255,255,.55); }
.footer-layout { display:grid; grid-template-columns:1fr 1fr auto; align-items:center; gap:30px; font-size:13px; }
.footer-layout p { margin:0; text-align:center; }
.footer-brand { display:flex; align-items:center; gap:12px; color:white; }
.footer-brand img { width:44px; height:44px; border-radius:12px; }
.footer-brand strong,.footer-brand span { display:block; }
.footer-brand span { color:rgba(255,255,255,.52); font-size:10px; }
.footer-legal { display:flex; flex-direction:column; align-items:flex-end; gap:3px; white-space:nowrap; }
.footer-legal a { color:rgba(255,255,255,.55); transition:color .2s; }
.footer-legal a:hover,.footer-legal a:focus-visible { color:white; }

.reveal { opacity:0; transform:translateY(26px); transition:opacity .65s ease,transform .65s ease; }
.reveal.visible { opacity:1; transform:none; }
@media (prefers-reduced-motion: reduce) { html{scroll-behavior:auto}.reveal{opacity:1;transform:none;transition:none}.orbit{animation:none}.button{transition:none} }

@media (max-width: 980px) {
  .desktop-nav,.nav-download { display:none; }
  .menu-button { display:flex; margin-left:auto; width:44px; height:44px; flex-direction:column; align-items:center; justify-content:center; gap:7px; border:0; border-radius:12px; background:rgba(255,255,255,.65); }
  .menu-button span { width:21px; height:2px; background:var(--navy); transition:transform .2s; }
  .menu-button[aria-expanded="true"] span:first-child { transform:translateY(4.5px) rotate(45deg); }
  .menu-button[aria-expanded="true"] span:last-child { transform:translateY(-4.5px) rotate(-45deg); }
  .mobile-nav { display:grid; max-height:0; overflow:hidden; background:white; transition:max-height .3s; }
  .mobile-nav.open { max-height:280px; border-top:1px solid var(--line); }
  .mobile-nav a { padding:14px 24px; border-bottom:1px solid #edf1f6; }
  .hero-layout { grid-template-columns:1fr; text-align:center; }
  .hero-copy { position:relative; z-index:4; }
  .eyebrow,.hero-actions { justify-content:center; }
  .hero-lead { margin-left:auto; margin-right:auto; }
  .hero-visual { margin-top:0; }
  .feature-grid { grid-template-columns:1fr 1fr; }
  .feature-large { grid-row:auto; grid-column:span 2; min-height:460px; }
  .courses-layout { grid-template-columns:1fr; gap:55px; }
  .course-tabs { max-width:none; flex-direction:row; border:0; gap:10px; }
  .course-tab { padding:10px 15px; border:1px solid rgba(255,255,255,.16); border-radius:99px; }
  .course-tab.active { padding-left:15px; border-left:1px solid var(--cyan); background:rgba(34,196,204,.12); }
  .course-tab:after { display:none; }
  .journey-grid { grid-template-columns:1fr 1fr; row-gap:50px; }
  .journey-grid:before { display:none; }
  .step-dot { margin:20px 0; }
  .download-device { opacity:.45; right:40px; }
  .download-copy { max-width:540px; }
  .footer-layout { grid-template-columns:1fr auto; }
  .footer-layout p { display:none; }
}

@media (max-width: 640px) {
  .container,.nav-shell { width:min(100% - 32px,var(--max)); }
  .nav-shell { height:68px; }
  .brand img { width:36px; height:36px; }
  .hero { min-height:auto; padding:120px 0 65px; }
  .hero-layout { gap:35px; }
  h1 { font-size:min(10.6vw,43px); }
  .hero-lead { font-size:16px; }
  .hero-actions { flex-direction:column; }
  .button { width:100%; }
  .hero-visual { height:490px; transform:scale(.82); margin:-40px 0 -55px; }
  .float-card.score-card { right:-24px; }
  .float-card.model-card { left:-35px; }
  .signals { min-height:96px; display:grid; grid-template-columns:1fr 1fr; gap:9px 20px; text-align:center; font-size:12px; }
  .signals i { display:none; }
  .section { padding:90px 0; }
  .section-heading { display:block; margin-bottom:40px; }
  .section-heading h2,.courses-copy h2,.download-copy h2 { font-size:36px; }
  .section-heading > p { margin-top:22px; }
  .feature-grid { grid-template-columns:1fr; }
  .feature-large { grid-column:auto; min-height:430px; }
  .feature-card { min-height:280px; }
  .feature-large .feature-copy { padding-bottom:110px; }
  .course-tabs { overflow-x:auto; padding-bottom:5px; }
  .course-tab { white-space:nowrap; }
  .course-panel { min-height:auto; padding:25px 20px; border-radius:24px; }
  .course-panel-top { grid-template-columns:1fr 86px; }
  .course-badge { width:82px; height:82px; border-radius:18px; }
  .course-panel h3 { font-size:24px; }
  .lesson-list li { grid-template-columns:30px 1fr; }
  .lesson-list em { display:none; }
  .course-meta { display:grid; gap:7px; }
  .journey-grid { grid-template-columns:1fr; gap:30px; }
  .journey-step { display:grid; grid-template-columns:48px 1fr; column-gap:16px; }
  .journey-step > span { grid-row:1; }
  .step-dot { position:absolute; left:8px; top:14px; width:12px; height:12px; border-width:3px; }
  .journey-step h3,.journey-step p { grid-column:2; }
  .journey-step h3 { margin-bottom:4px; }
  .download { padding-bottom:70px; }
  .download-card { min-height:520px; padding:55px 27px; border-radius:26px; align-items:start; }
  .download-device { width:155px; height:315px; right:25px; bottom:-170px; opacity:.55; }
  .footer-layout { display:flex; flex-direction:column; align-items:flex-start; gap:18px; }
  .footer-legal { align-items:flex-start; }
}