:root{--green:#07584c;--ink:#143f37;--cream:#fffcef;--muted:#536c62;--line:#dce6db;--blue:#1873bd;--orange:#db641d;--red:#da5634;color-scheme:light;font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:#f0f3e9}*{box-sizing:border-box}body{margin:0}a{color:inherit}button,summary{font:inherit}img{display:block;max-width:100%}a,summary,button{-webkit-tap-highlight-color:transparent}a:focus-visible,summary:focus-visible,button:focus-visible{outline:3px solid #df9b32;outline-offset:4px;border-radius:8px}.skip{position:absolute;left:12px;top:-80px;z-index:10;background:white;padding:12px}.skip:focus{top:12px}.preview{padding:7px 16px;text-align:center;background:#eae7d6;font-size:12px;line-height:1.6;color:#596250}.frame{max-width:1200px;min-height:100vh;margin:auto;background:var(--cream);box-shadow:0 0 35px #143f370a}.top{position:relative;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:20px 22px;z-index:3}.brand{display:flex;gap:9px;align-items:center;text-decoration:none}.brand img{width:40px;height:40px;object-fit:contain;mix-blend-mode:multiply}.brand strong{display:block;font-size:22px;letter-spacing:.1em}.brand small{display:block;font-size:11px;line-height:1.6;letter-spacing:.04em}.menu{position:relative}.menu summary{display:grid;place-items:center;width:44px;height:44px;cursor:pointer;list-style:none;font-size:25px;color:var(--green)}.menu summary::-webkit-details-marker{display:none}.menu nav{position:absolute;right:0;top:51px;width:232px;max-width:82vw;padding:12px;background:#fffdf6;border:1px solid var(--line);border-radius:16px;box-shadow:0 12px 36px #123c3724}.menu nav a{display:block;padding:12px;border-radius:9px;text-decoration:none;font-size:15px}.menu nav a:hover{background:#eff4e8}.menu-note{font-size:12px;line-height:1.8;padding:10px 12px;color:var(--muted);border-top:1px solid var(--line)}.home-layout{display:grid;grid-template-columns:1fr}.hero-copy{padding:20px 24px 0;position:relative}.hero h1{font-family:"Noto Serif CJK SC","Songti SC",SimSun,serif;font-size:clamp(30px,8.1vw,44px);line-height:1.36;margin:0 0 15px;font-weight:800;letter-spacing:.01em}.hero p{font-size:15px;line-height:1.9;margin:0;color:#24584a}.students{width:100%;aspect-ratio:366/189;object-fit:cover;margin-top:14px}.services{position:relative;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:-7px 16px 0;align-self:center;scroll-margin-top:20px}.card{position:relative;display:flex;flex-direction:column;align-items:center;min-width:0;min-height:164px;padding:16px 8px 12px;background:#fffdf7f5;border:1px solid #e3e5d4;border-radius:18px;box-shadow:0 3px 10px #1d54400a;text-align:center;text-decoration:none;transition:transform .18s,box-shadow .18s}.card:hover{transform:translateY(-3px);box-shadow:0 8px 20px #1d544015}.card img{height:54px;width:87px;object-fit:contain;mix-blend-mode:multiply}.card h2{font-size:19px;line-height:1.35;margin:7px 0 4px}.card p{font-size:12px;line-height:1.6;margin:0;color:#365d52}.card .arrow{display:grid;place-items:center;font-size:18px;width:27px;height:27px;border-radius:50%;background:var(--green);color:#fff;margin-top:9px}.card[data-product=wanbian-math] .arrow{background:var(--blue)}.card[data-product=writing] .arrow{background:var(--red)}.card[data-product=writing]{background:#fff5e8}.tagline{margin:23px 16px 4px;font-family:"Noto Serif CJK SC","Songti SC",serif;font-weight:700;letter-spacing:.06em;font-size:15px;line-height:1.9;text-align:center}.landscape{width:100%;height:130px;object-fit:cover;object-position:center}.policy{font-size:13px;line-height:1.8;color:var(--muted);padding:15px 20px;text-align:center;border-top:1px solid #dce6db}.policy strong{display:block;color:var(--ink)}.footer{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;padding:14px 20px 24px;font-size:12px;color:var(--muted);border-top:1px solid #e7ecde}.legacy{margin:12px 20px;padding:12px;border:1px solid #e5d79c;border-radius:12px;background:#fff7d9;font-size:14px;line-height:1.8}.legacy a{text-decoration:underline}.legacy[hidden]{display:none}.product-wrap,.about{max-width:740px;margin:0 auto;padding:0 22px 30px}.product-hero{width:100%;aspect-ratio:1.7;object-fit:cover;border-radius:18px;margin:0 0 22px}.product-title{font-family:"Noto Serif CJK SC","Songti SC",serif;font-size:32px;line-height:1.4;margin:0 0 6px}.product-subtitle{font-size:18px;font-weight:600;margin:0 0 17px}.product-copy{font-size:16px;line-height:1.95;margin:0 0 24px}.feature-grid{display:grid;gap:12px;margin:18px 0 25px}.feature{padding:16px;border-radius:16px;background:#eff4e6}.feature h2{font-size:17px;margin:0 0 6px}.feature p{font-size:14px;line-height:1.8;margin:0}.product-math{--green:#1873bd}.product-math .feature{background:#edf5fb}.product-reading .feature,.product-writing .feature{background:#fff3e4}.product-reading{--green:#d96320}.product-writing{--green:#da5634}.primary{display:block;padding:14px;text-align:center;border-radius:24px;background:var(--green);color:white;font-size:17px;font-weight:600;text-decoration:none}.unavailable{background:#edf0e8;color:#697568;border:1px solid var(--line);cursor:not-allowed;width:100%}.state-note{font-size:13px;line-height:1.9;color:var(--muted);text-align:center}.back{display:inline-block;min-height:44px;padding:12px 0;font-size:14px;text-decoration:none}.about h1{font-family:"Noto Serif CJK SC","Songti SC",serif;font-size:30px}.about p{font-size:16px;line-height:2}.status-strip{padding:9px 20px;background:#f3f5ea;font-size:12px;line-height:1.8;text-align:center;color:#536c62}
@media(max-width:350px){.top{padding:14px 16px}.brand strong{font-size:20px}.hero-copy{padding:16px 18px 0}.hero h1{font-size:29px}.hero p{font-size:13px}.services{gap:9px;margin-left:12px;margin-right:12px}.card{min-height:154px;padding:12px 4px}.card h2{font-size:17px}.card p{font-size:11px}.tagline{font-size:13px}}
@media(min-width:600px) and (max-width:899px){.frame{max-width:520px}.hero h1{font-size:44px}.services{margin-left:22px;margin-right:22px}.card{min-height:185px}.card h2{font-size:22px}.card p{font-size:14px}.students{max-height:260px}.landscape{height:150px}}
@media(min-width:900px){.frame{margin:24px auto;border:1px solid var(--line);border-radius:26px;overflow:hidden;min-height:0}.top{padding:24px 40px}.home-layout{grid-template-columns:1.03fr 1fr;gap:32px;padding:8px 40px 0}.hero-copy{padding:14px 0 0}.hero h1{font-size:44px}.hero p{font-size:16px}.students{border-radius:20px}.services{margin:0;gap:16px}.card{min-height:194px;padding:22px 10px 18px}.card img{height:65px;width:105px}.card h2{font-size:23px}.card p{font-size:14px}.card .arrow{margin-top:14px}.tagline{margin-top:27px;font-size:18px}.landscape{height:165px;object-position:50% 63%}.feature-grid{grid-template-columns:1fr 1fr}.product-wrap{padding-top:10px}}
@media(prefers-reduced-motion:reduce){.card{transition:none}.card:hover{transform:none}}

.card[data-product=reading] .arrow{background:#bd861c}

.card[data-product=learning-empowerment] .arrow{background:#2e7d32}
.footer .copyright{flex-basis:100%;min-width:0;text-align:center;overflow-wrap:anywhere;line-height:1.8}

.menu nav{max-height:calc(100vh - 120px);max-height:calc(100dvh - 120px);overflow-y:auto;overscroll-behavior:contain}