:root{--blue:#1964ad;--blue-dark:#124b84;--ink:#172d45;--muted:#627183;--line:#e3e9f0;--canvas:#fff}
html{scroll-behavior:smooth;scroll-padding-top:30px}body{background:#fff;color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}button,a{touch-action:manipulation}button{border-radius:7px}button:focus-visible,a:focus-visible{outline:3px solid #1964ad;outline-offset:5px}.skip-link{position:fixed;top:10px;left:20px;padding:10px 20px;background:#fff;border:2px solid var(--blue);z-index:50;transform:translateY(-160%)}.skip-link:focus{transform:translateY(0)}
header{border-bottom:1px solid #edf0f4}.header-inner{max-width:1264px;min-height:88px;padding:18px 32px;gap:48px}.brand{gap:14px}.brand img{width:100px;height:36px}.brand span{font-size:19px;letter-spacing:.03em;font-weight:700;padding-left:14px}nav{gap:30px}nav a{font-size:15px;color:#526173}nav a.active{color:var(--ink);font-weight:600}nav a.active:after{height:2px;background:var(--blue);bottom:-19px}.header-actions{gap:12px}.header-actions button{font-size:14px}.header-actions .primary{padding:10px 18px}.header-actions .primary svg{width:16px}.primary{box-shadow:none}.text-button:hover{background:#f3f6fa}
main{max-width:1264px;padding:44px 32px 72px}.catalog-page{padding-top:0}.home-hero{min-height:502px;display:grid;grid-template-columns:1.08fr 1fr;align-items:center;gap:32px;padding:40px 0 42px}.hero-copy{padding-bottom:6px}.hero-copy h1{font-size:clamp(34px,4.1vw,56px);font-weight:650;line-height:1.42;letter-spacing:-.055em;margin:0 0 24px}.hero-copy h1 span{display:block}.hero-description{color:var(--muted);font-size:16px;line-height:1.95;margin:0;max-width:440px}.hero-actions{display:flex;gap:22px;align-items:center;margin-top:30px}.hero-actions a{min-height:48px;display:inline-flex;align-items:center;justify-content:center;gap:16px;padding:12px 24px;border-radius:7px;font-size:15px}.hero-actions .hero-enroll{border:0;color:#4d6178;background:transparent;padding:12px 0;min-height:48px;font-size:15px}.hero-enroll:hover{color:var(--blue);background:transparent}.hero-actions svg{width:17px;height:17px}.hero-figure{margin:0;align-self:center;min-width:0}.hero-figure img{display:block;width:100%;height:auto}.hero-note{display:flex;gap:8px;color:#68798b;font-size:13px;margin:26px 0 0;align-items:center}.hero-note svg{width:15px;height:15px;color:#7f98b2}
.catalog-section{border-top:1px solid var(--line);padding-top:36px;scroll-margin-top:28px}.catalog-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:32px}.catalog-heading h1,.catalog-heading h2{font-size:26px;line-height:1.4;margin:0 0 7px;font-weight:650;letter-spacing:-.035em}.catalog-heading p{margin:0;color:var(--muted);font-size:14px}.catalog-page.subject-page{padding-top:48px}.subject-page .catalog-section{border-top:0;padding-top:0}.subject-switch{background:#f1f4f8;border:1px solid #edf0f4;border-radius:9px;padding:4px;gap:4px}.subject-switch button{min-width:94px;padding:9px 18px;font-size:15px;min-height:43px;border-radius:6px;color:#5b6d80;gap:8px}.subject-switch button svg{width:17px;height:17px}.subject-switch button.active{background:#fff;color:var(--blue);box-shadow:0 1px 4px #172d450b}.subject-switch button:hover{color:var(--blue)}
.catalog-stage{display:grid;grid-template-columns:170px minmax(0,1fr);gap:36px;padding:28px 0;border-top:1px solid var(--line);scroll-margin-top:28px}.catalog-stage:first-of-type{padding-top:0;border-top:0}.stage-info{padding-top:8px}.stage-icon{width:34px;height:34px;background:#f1f6fc;border-radius:8px;display:flex;align-items:center;justify-content:center;color:#517da6;margin-bottom:13px}.stage-icon svg{width:18px;height:18px}.stage-info h2,.stage-info h3{font-size:21px;margin:0 0 8px;line-height:1.4;font-weight:600}.stage-info p{font-size:13px;line-height:1.8;color:var(--muted);margin:0}.grade-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;align-content:start}.grade-card{border:1px solid var(--line);border-radius:10px;background:#fff;transition:border-color .15s}.grade-card:hover{border-color:#a6bfd8}.grade-title{padding:20px 20px 13px;border:0;display:flex;align-items:center;justify-content:space-between}.grade-title h3,.grade-title h4{font-size:18px;font-weight:600;margin:0}.grade-title>svg{color:#a2b1c1;width:17px;height:17px}.terms{padding:0 20px 9px}.term{min-height:43px;gap:6px;padding:10px 0;font-size:15px;align-items:center;line-height:1.5;border-radius:0}.term small{font-size:12px;color:#8491a1;margin-left:auto;font-variant-numeric:tabular-nums}.term svg{color:#91a5b9;width:15px;height:15px}.term:hover{background:transparent;color:var(--blue)}.term:hover svg{color:var(--blue)}.catalog-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:12px;padding:24px 0 0;border-top:1px solid var(--line);font-size:14px;color:var(--muted)}.catalog-bottom p{margin:0}.catalog-bottom button{font-size:14px;color:var(--blue);padding-right:0}
footer{max-width:1200px;margin:0 auto;padding:25px 0 30px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}footer>div{gap:24px}footer button{font-size:13px}footer svg{width:14px;height:14px}dialog{border-radius:12px}dialog::backdrop{background:#172d4566;backdrop-filter:blur(3px)}.page-top h1{letter-spacing:-.025em}
@media(min-width:1700px){.home-hero{min-height:560px}.hero-copy h1{font-size:60px}}
@media(max-width:1100px){.header-inner{gap:25px}.brand img{width:88px}.brand span{font-size:17px}nav{gap:20px}.header-actions{gap:4px}.home-hero{gap:12px;min-height:450px}.hero-copy h1{font-size:43px}.catalog-stage{grid-template-columns:130px minmax(0,1fr);gap:24px}.grade-title{padding:18px 16px 12px}.terms{padding:0 16px 8px}footer{margin:0 32px}}
@media(max-width:760px){.header-inner{padding:17px 20px 15px;min-height:0;gap:18px 8px}.brand{gap:10px}.brand img{width:76px;height:28px}.brand span{font-size:16px;padding-left:10px}.header-actions .primary{padding:8px 11px;font-size:13px;min-height:38px}.header-actions .primary svg{width:14px}nav{padding:2px 0 0;gap:0}nav a{font-size:15px;padding:0 8px}nav a.active:after{bottom:-16px;left:8px;right:8px}#mobile-signup{font-size:14px;color:#526173;min-height:28px;padding:0 4px}main{padding:30px 20px 44px}.catalog-page{padding-top:0}.home-hero{grid-template-columns:1fr;gap:0;padding:42px 0 26px;min-height:0}.hero-copy h1{font-size:clamp(32px,7.8vw,44px);line-height:1.45;letter-spacing:-.06em;margin-bottom:18px}.hero-description{font-size:15px;max-width:100%;line-height:1.9}.hero-actions{margin-top:24px;gap:24px}.hero-actions a{padding:11px 21px;font-size:14px;min-height:46px}.hero-actions .hero-enroll{font-size:14px}.hero-note{margin-top:20px;font-size:12px}.hero-figure{width:min(100%,460px);margin:8px auto 0}.catalog-section{padding-top:26px}.catalog-heading{flex-direction:column;align-items:flex-start;gap:22px;margin-bottom:28px}.catalog-heading h1,.catalog-heading h2{font-size:24px}.catalog-heading p{font-size:13px}.subject-switch{width:100%}.subject-switch button{flex:1;min-width:0;padding:9px 10px;font-size:15px}.catalog-stage{grid-template-columns:1fr;gap:18px;padding:25px 0}.stage-info{padding:0;display:grid;grid-template-columns:auto 1fr;column-gap:10px;align-items:center}.stage-icon{grid-row:1/3;margin:0;width:39px;height:39px}.stage-info h2,.stage-info h3{font-size:19px;margin:0 0 1px}.stage-info p{font-size:12px}.grade-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.grade-title{padding:16px 14px 8px}.grade-title h3,.grade-title h4{font-size:17px}.grade-title>svg{width:15px;height:15px}.terms{padding:0 14px 7px}.term{font-size:14px;min-height:44px;padding:10px 0}.term small{display:inline;font-size:11px}.term svg{width:13px;height:13px}.catalog-bottom{align-items:flex-start;flex-direction:column;gap:8px;padding-top:20px;font-size:13px}.catalog-bottom .text-button{padding:4px 0}.catalog-page.subject-page{padding-top:30px}footer{margin:0 20px;padding:22px 0 24px;gap:10px;font-size:12px}footer div{gap:18px}footer button{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}


/* Premium editorial direction: a dark learning studio with one lime action. */
:root{--blue:#1964ad;--blue-dark:#124b84;--ink:#172d45;--muted:#627183;--line:#e3e9f0;--canvas:#f7f8fa;--night:#10243c;--night-soft:#1a3857;--lime:#d8ff68}
body{background:var(--canvas)}header{background:rgba(255,255,255,.96);backdrop-filter:blur(18px);position:relative;z-index:2}.header-inner{max-width:1280px}.brand span{letter-spacing:.01em}nav a{letter-spacing:.01em}nav a.active:after{background:var(--night)}.header-actions .primary{background:var(--night);border-color:var(--night);color:#fff}.header-actions .primary:hover{background:#23476a}
.home-hero{position:relative;overflow:hidden;min-height:556px;margin:0 -18px;padding:64px 60px 58px;border-radius:0 0 24px 24px;background:var(--night);grid-template-columns:1fr 1fr;gap:42px;color:#fff}.home-hero:before{content:"";position:absolute;width:620px;height:620px;right:-160px;top:-290px;border:1px solid rgba(216,255,104,.17);border-radius:50%;box-shadow:0 0 0 42px rgba(216,255,104,.035),0 0 0 84px rgba(216,255,104,.025);pointer-events:none}.home-hero:after{content:"";position:absolute;left:42%;bottom:-210px;width:360px;height:360px;background:rgba(26,56,87,.82);border-radius:50%;pointer-events:none}.hero-copy,.hero-figure{position:relative;z-index:1}.hero-copy{padding:0 0 8px;align-self:center}.hero-kicker{display:flex;align-items:center;gap:10px;color:var(--lime);font-size:11px;font-weight:700;letter-spacing:.16em;margin:0 0 24px}.hero-kicker span{display:block;width:28px;height:2px;background:var(--lime)}.hero-copy h1{font-size:clamp(38px,4.2vw,61px);line-height:1.35;letter-spacing:-.065em;font-weight:650;margin:0 0 24px;color:#fff}.hero-description{color:#b8c9da;max-width:470px;font-size:16px;line-height:2}.hero-actions{margin-top:30px}.hero-actions .primary{background:var(--lime);border-color:var(--lime);color:var(--night);font-weight:700;box-shadow:0 9px 24px rgba(216,255,104,.15)}.hero-actions .primary:hover{background:#e5ff99;border-color:#e5ff99}.hero-actions .hero-enroll{color:#d7e3ef}.hero-enroll:hover{color:var(--lime);background:transparent}.hero-note{color:#91a7bc;margin-top:22px}.hero-note svg{color:var(--lime)}.hero-stats{display:flex;gap:30px;margin-top:37px;padding-top:20px;border-top:1px solid rgba(216,255,104,.25);max-width:450px}.hero-stats div{display:flex;align-items:baseline;gap:7px}.hero-stats strong{font-size:25px;line-height:1;color:#fff;font-weight:600;letter-spacing:-.04em}.hero-stats span{font-size:11px;color:#9fb2c5}.hero-figure{align-self:center;padding:23px;background:#eaf3fb;border:1px solid rgba(255,255,255,.44);border-radius:18px;box-shadow:0 22px 50px rgba(1,10,20,.25);transform:rotate(1.2deg)}.hero-figure:before{content:"FUNCTIONS / 01";position:absolute;left:24px;top:10px;color:#7290ac;font:600 9px/1 Arial,sans-serif;letter-spacing:.14em}.hero-figure img{margin-top:7px}.catalog-section{border-top:0;margin-top:46px;padding-top:0}.catalog-heading h1,.catalog-heading h2{font-size:29px}.catalog-heading p{color:#748297}.subject-switch{background:#edf1f5;border-color:#e5eaf0}.grade-card{box-shadow:0 6px 20px rgba(30,56,82,.04);background:#fff}.grade-card:hover{box-shadow:0 9px 24px rgba(30,56,82,.09);transform:translateY(-2px);transition:transform .15s,box-shadow .15s,border-color .15s}.stage-icon{background:#e8f1f8}.catalog-bottom{background:#fff;border:1px solid var(--line);border-radius:10px;padding:21px 24px;margin-top:25px}.catalog-bottom button{font-weight:600}.catalog-page.subject-page{padding-top:48px}.subject-page .catalog-section{margin-top:0}
@media(max-width:1100px){.home-hero{padding-left:42px;padding-right:42px;margin-left:-8px;margin-right:-8px}.hero-copy h1{font-size:46px}.hero-stats{gap:20px}}
@media(max-width:760px){.home-hero{margin:0 -20px;padding:42px 20px 34px;border-radius:0 0 18px 18px;display:grid;grid-template-columns:1fr;gap:3px}.home-hero:before{width:360px;height:360px;right:-180px;top:-155px;box-shadow:0 0 0 25px rgba(216,255,104,.035),0 0 0 50px rgba(216,255,104,.025)}.hero-kicker{font-size:9px;letter-spacing:.13em;margin-bottom:19px}.hero-copy h1{font-size:clamp(35px,9.4vw,46px);line-height:1.38;margin-bottom:17px}.hero-description{color:#b8c9da;font-size:14px;line-height:1.9}.desktop-break{display:none}.hero-actions{margin-top:24px}.hero-actions .primary{box-shadow:0 7px 18px rgba(216,255,104,.12)}.hero-stats{gap:22px;margin-top:29px;padding-top:17px}.hero-stats strong{font-size:22px}.hero-stats span{font-size:10px}.hero-note{font-size:11px;margin-top:17px}.hero-figure{margin:24px auto 0;width:min(100%,430px);padding:13px;border-radius:14px;transform:rotate(0)}.hero-figure:before{left:15px;top:6px;font-size:8px}.hero-figure img{margin-top:5px}.catalog-section{margin-top:32px}.catalog-heading h1,.catalog-heading h2{font-size:25px}.grade-card{box-shadow:none}.grade-card:hover{transform:none;box-shadow:none}.catalog-bottom{padding:17px 18px}}