:root{--ink:#183746;--muted:#607581;--paper:#fffdf8;--line:#dce5e7;--coral:#e86655;--blue:#3d80b8;--jade:#3e8b72;--sun:#f2ba4c;--shadow:0 18px 46px rgba(24,55,70,.12)}
*{box-sizing:border-box;letter-spacing:0}
body{margin:0;background:#f4f7f6;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}
.topbar{height:64px;padding:0 max(24px,calc((100% - 1084px)/2));display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:10}
.brand{display:flex;align-items:center;color:inherit;text-decoration:none}
.brand img{display:block;width:144px;height:33px;object-fit:contain}
.home-link{padding:9px 12px;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--ink);text-decoration:none;font-size:13px;font-weight:700}
.catalog-intro{background:#fff;border-bottom:1px solid var(--line)}
.catalog-inner{max-width:1140px;margin:auto;padding:26px 28px 22px}
.eyebrow{margin:0 0 8px;color:#b54d3c;font-size:12px;line-height:1.5;font-weight:800}
.catalog-intro h1{margin:0;font-size:36px;line-height:1.25;font-weight:850}
.catalog-tagline{margin:10px 0 20px;font-size:19px;line-height:1.5}
.catalog-tagline em{color:#bf5040;font-style:normal}
.catalog-summary{display:flex;align-items:center;justify-content:space-between;gap:12px 24px;flex-wrap:wrap}
.catalog-facts{display:flex;align-items:center;gap:20px}
.catalog-facts span{display:inline-flex;align-items:baseline;gap:6px;color:var(--muted);font-size:13px;white-space:nowrap}
.catalog-facts span+span{padding-left:20px;border-left:1px solid var(--line)}
.catalog-facts b{color:var(--ink);font-size:20px;line-height:1.2}
.trial-note{margin:0;color:#36705e;font-size:13px;line-height:1.6}
.subject-section{max-width:1140px;margin:auto;padding:24px 28px 32px}
.section-heading h2{margin:0 0 16px;font-size:21px;line-height:1.4}
.subject-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.subject-card{min-width:0;min-height:308px;padding:22px;position:relative;display:flex;flex-direction:column;border:1px solid #d7e3e0;border-top:4px solid var(--card);border-radius:8px;background:#fff;color:var(--ink);text-decoration:none;transition:border-color .16s,box-shadow .16s}
.subject-card:hover{border-color:var(--card);box-shadow:0 5px 18px rgba(24,55,70,.08)}
.subject-card:focus-visible,.brand:focus-visible,.home-link:focus-visible{outline:3px solid var(--blue);outline-offset:3px}
.subject-card.english{--card:#78b7d7;--icon-bg:#eaf5fc;--icon-ink:#29618a}
.subject-card.chinese{--card:#eaa898;--icon-bg:#fff0e9;--icon-ink:#a64d3b}
.subject-card.math{--card:#84bfa8;--icon-bg:#eaf7f0;--icon-ink:#286950}
.card-count{position:absolute;right:22px;top:24px;color:var(--muted);font:700 11px/1.5 ui-monospace,monospace}
.subject-icon{width:52px;height:52px;margin-bottom:18px;display:grid;place-items:center;border-radius:8px;background:var(--icon-bg);color:var(--icon-ink);font:800 26px Georgia}
.subject-card small{color:var(--muted);font-size:10px;font-weight:800}
.subject-card h3{margin:5px 0 10px;font-size:23px;line-height:1.4;overflow-wrap:anywhere}
.subject-card.math h3{font-size:22px}
.subject-card.math .title-age{display:inline-block;font-size:15px;font-weight:600;white-space:nowrap}
.subject-card p{margin:0 0 20px;color:var(--muted);font-size:14px;line-height:1.7}
.enter{margin-top:auto;padding-top:14px;display:flex;align-items:center;justify-content:space-between;gap:8px;border-top:1px solid var(--line);font-size:15px;font-weight:750;line-height:1.4}
.enter b{font-size:22px}
.price-strip{max-width:1084px;margin:0 auto 74px;display:grid;grid-template-columns:1.2fr 1fr 1fr;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:var(--shadow);overflow:hidden}.price-strip>div{min-height:150px;padding:25px;display:flex;justify-content:center;flex-direction:column;border-right:1px solid var(--line)}.price-strip>div:last-child{border:0}.price-strip small,.price-strip span{color:var(--muted);font-size:12px}.price-strip b{margin:6px 0;font-size:24px}.price-strip b em{font-size:16px;font-style:normal}.price-strip .best{background:#173a45;color:#fff}.price-strip .best small,.price-strip .best span{color:#c3d7dd}.steps{max-width:1084px;margin:0 auto 75px;padding:0 10px}.steps h2{text-align:center;font-size:32px}.steps ol{padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:13px;list-style:none}.steps li{padding:23px;display:flex;gap:15px;border-top:3px solid var(--coral);background:#fff}.steps li>b{color:#e6a49b;font:900 30px Georgia}.steps strong{display:block;margin-bottom:6px}.steps span{color:var(--muted);font-size:13px;line-height:1.6}footer{padding:27px;text-align:center;color:var(--muted);font-size:12px;border-top:1px solid var(--line);background:#fff}
@media(min-width:821px) and (max-height:720px){.catalog-inner{padding-block:18px 16px}.catalog-intro h1{font-size:32px}.catalog-tagline{margin:7px 0 14px}.eyebrow{margin-bottom:5px}.subject-section{padding-top:18px}.subject-card{min-height:282px;padding:18px}.subject-icon{width:46px;height:46px;margin-bottom:14px}.subject-card p{margin-bottom:14px}}
@media(max-width:1140px){.price-strip{margin-inline:28px}.steps{padding-inline:28px}}
@media(max-width:820px){.catalog-summary{align-items:flex-start;flex-direction:column;gap:14px}.subject-grid{grid-template-columns:1fr}.subject-card{min-height:0;padding:20px;display:grid;grid-template-columns:52px minmax(0,1fr);gap:0 18px}.subject-icon{grid-row:1/3;margin:0}.subject-card>div:not(.subject-icon){grid-column:2}.subject-card small{display:none}.subject-card h3,.subject-card.math h3{margin:0 76px 7px 0;font-size:21px}.subject-card p{margin-bottom:14px}.card-count{right:20px;top:23px}.enter{grid-column:2}.price-strip{margin-inline:28px;grid-template-columns:1fr}.price-strip>div{min-height:112px;border-right:0;border-bottom:1px solid var(--line)}.steps ol{grid-template-columns:1fr}}
@media(max-width:520px){.topbar{height:60px;padding:0 16px}.brand img{width:132px;height:30px}.home-link{font-size:12px;padding:9px}.catalog-inner{padding:22px 18px 20px}.catalog-intro h1{font-size:30px}.catalog-tagline{font-size:16px;margin:8px 0 18px}.catalog-facts{gap:10px}.catalog-facts span{font-size:12px;gap:5px}.catalog-facts span+span{padding-left:10px}.catalog-facts b{font-size:18px}.trial-note{font-size:12px}.subject-section{padding:20px 16px 28px}.section-heading h2{font-size:19px;margin-bottom:14px}.subject-grid{gap:12px}.subject-card{padding:16px;grid-template-columns:42px minmax(0,1fr);gap:0 12px}.subject-icon{width:42px;height:42px;font-size:23px}.subject-card h3,.subject-card.math h3{font-size:19px;margin-right:0}.subject-card.math .title-age{font-size:13px}.subject-card p{font-size:13px;line-height:1.6}.card-count{position:static;grid-column:2;grid-row:2;font-size:10px;margin:0 0 10px}.subject-icon{grid-column:1;grid-row:1/4}.subject-card>div:not(.subject-icon){grid-row:1}.enter{grid-row:3;font-size:14px;padding-top:10px}.price-strip{margin:0 16px 40px}.steps{padding:0 16px}.steps h2{font-size:25px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.price-buy{width:max-content;min-width:136px;min-height:40px;margin-top:14px;padding:9px 16px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--ink);border-radius:7px;background:var(--ink);color:#fff;font-family:inherit;font-size:14px;font-weight:800;line-height:1.3;text-decoration:none;cursor:pointer}.price-buy:hover{background:#2c5667}.price-strip .best .price-buy{border-color:#fff;background:#fff;color:#173a45}.price-strip .best .price-buy:hover{background:#e6f0ef}.price-buy:focus-visible,.subject-purchase-dialog button:focus-visible,.subject-purchase-options a:focus-visible{outline:3px solid var(--sun);outline-offset:3px}
.subject-purchase-dialog{width:min(420px,calc(100vw - 32px));max-width:none;max-height:calc(100dvh - 32px);padding:24px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink);box-shadow:var(--shadow)}.subject-purchase-dialog::backdrop{background:rgba(20,36,42,.58)}.subject-purchase-head{display:flex;align-items:center;justify-content:space-between;gap:16px}.subject-purchase-head h2{margin:0;font-size:21px}.subject-purchase-head button{width:36px;height:36px;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--ink);font-size:24px;cursor:pointer}.subject-purchase-options{display:grid;gap:10px;margin-top:18px}.subject-purchase-options a{min-height:52px;padding:12px 15px;display:flex;align-items:center;justify-content:space-between;border:1px solid var(--line);border-radius:7px;color:var(--ink);font-weight:750;text-decoration:none}.subject-purchase-options a:hover{border-color:var(--jade);background:#f2f8f5}