:root{--bg:#ffffff;--surface:#f5f5f7;--surface-pressed:#e8e8ed;--ink:#1d1d1f;--ink-2:#6e6e73;--line:#d2d2d7;--control-line:#86868b;--accent:#0066cc;--accent-pressed:#0055aa;--accent-soft:#e8f0fe;--accent-ink:#0b57d0;--success-ink:#1e7b34;--success-bg:#e6f4ea;--warning-ink:#8a4b00;--warning-bg:#fff4e5;--danger-ink:#b3261e;--danger-bg:#fdecea;--disabled-ink:#5b5b60;color-scheme:light}*,:after,:before{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,Segoe UI,PingFang SC,Hiragino Sans GB,Noto Sans CJK SC,Microsoft YaHei,Droid Sans Fallback,sans-serif;font-size:1rem;line-height:1.55;overflow-x:hidden}a{color:var(--accent);text-underline-offset:3px}a:hover{text-decoration:underline}img,svg{display:block}h1,h2,h3,ol,p,ul{margin:0}ol,ul{padding:0}button,input{font:inherit;color:inherit}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.skip-link{position:absolute;left:12px;top:-80px;z-index:100;background:var(--bg);color:var(--ink);padding:12px 16px;border:1px solid var(--control-line);border-radius:12px}.skip-link:focus{top:12px}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:20;background:var(--bg);border-bottom:1px solid var(--line)}.header-inner{max-width:1120px;margin:0 auto;min-height:56px;padding:0 20px;display:flex;align-items:center;gap:8px}.brand{min-height:44px;padding-right:4px;color:var(--ink);font-size:1.0625rem;font-weight:600;text-decoration:none}.brand,.demo-pill{display:inline-flex;align-items:center;white-space:nowrap}.demo-pill{height:24px;padding:0 9px;border-radius:999px;background:var(--surface);color:var(--ink-2);font-size:.8125rem}.header-spacer{flex:1 1}.header-actions{display:flex;align-items:center;gap:8px}.locale-switch{display:inline-flex;border:1px solid var(--control-line);border-radius:999px;overflow:hidden}.locale-switch button{min-width:44px;min-height:44px;padding:0 10px;border:0;background:var(--bg);color:var(--ink-2);font-size:.8125rem;cursor:pointer}.locale-switch button[aria-pressed=true]{background:var(--surface-pressed);color:var(--ink);font-weight:600}.account-wrap{position:relative}.account-button{display:inline-flex;align-items:center;gap:4px;min-height:44px;padding:0 12px;border:1px solid var(--control-line);border-radius:12px;background:var(--bg);color:var(--ink);font-size:.875rem;cursor:pointer;white-space:nowrap}.account-menu{position:absolute;right:0;top:calc(100% + 6px);min-width:180px;padding:6px;background:var(--bg);border:1px solid var(--line);border-radius:12px;z-index:30}.account-menu a,.account-menu button{display:flex;align-items:center;width:100%;min-height:44px;padding:0 10px;border:0;border-radius:8px;background:none;color:var(--ink);font-size:.9375rem;text-align:left;text-decoration:none;cursor:pointer}.account-menu a:hover,.account-menu button:hover{background:var(--surface)}.page{max-width:1120px;margin:0 auto;padding:32px 20px 72px}.narrow{max-width:720px}.page-head{margin-bottom:24px}h1{font-size:1.75rem;line-height:1.2;letter-spacing:-.02em}h1,h2{font-weight:600}h2{font-size:1.375rem;line-height:1.27}h3{font-size:1.0625rem;line-height:1.4;font-weight:600}.muted{color:var(--ink-2)}.small{font-size:.9375rem;line-height:1.45}a.small{display:inline-flex;align-items:center;min-width:44px;min-height:44px}.caption{font-size:.8125rem;line-height:1.4}.hero{padding:24px 0 40px}.hero h1{font-size:2.125rem;line-height:1.18;max-width:18ch}.hero p{margin-top:16px;max-width:34rem;color:var(--ink-2);font-size:1.0625rem}.section-title{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin:32px 0 16px}.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 20px;border-radius:12px;border:1px solid transparent;font-size:1.0625rem;font-weight:500;line-height:1.3;cursor:pointer;transition:background-color .16s cubic-bezier(.2,0,0,1),border-color .16s cubic-bezier(.2,0,0,1)}.button,.button:hover{text-decoration:none}.button-primary{background:var(--accent);color:#fff}.button-primary:hover{background:var(--accent-pressed)}.button-secondary{background:var(--bg);border-color:var(--control-line);color:var(--ink)}.button-secondary:hover{background:var(--surface)}.button-ghost{min-height:44px;padding:0 8px;background:transparent;color:var(--accent);border:0}.button-block{width:100%}.button:disabled,.button[aria-disabled=true]{background:var(--surface-pressed);border-color:transparent;color:var(--disabled-ink);cursor:not-allowed}.button[aria-busy=true]{cursor:progress}.actions{display:flex;flex-wrap:wrap;gap:12px}.actions .button{flex:1 1 200px}.course-grid{display:grid;grid-template-columns:1fr;grid-gap:16px;gap:16px}.course-card{display:flex;flex-direction:column;gap:8px;min-height:150px;padding:20px;border:1px solid var(--line);border-radius:12px;background:var(--bg);color:var(--ink);text-decoration:none}.course-card:hover{border-color:var(--control-line);text-decoration:none}.course-card:hover h3{color:var(--accent)}.course-card h3,.course-card p{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.course-card p{color:var(--ink-2);font-size:.9375rem}.card-meta{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-top:auto;padding-top:8px}.price{font-size:1.375rem;font-weight:600;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.field{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}.field label{font-size:.9375rem;font-weight:500}.input{min-height:50px;width:100%;padding:0 16px;border:1px solid var(--control-line);border-radius:12px;background:var(--bg);font-size:1rem}.input:focus{outline:2px solid var(--accent);outline-offset:0}.input[aria-invalid=true]{border-color:var(--danger-ink)}.field-error{gap:6px;color:var(--danger-ink);font-size:.8125rem}.field-error,.search-row{display:flex;align-items:center}.search-row{position:relative;margin-bottom:16px}.search-row .input{padding-left:44px;padding-right:52px}.search-icon{left:14px;pointer-events:none}.search-clear,.search-icon{position:absolute;color:var(--ink-2)}.search-clear{right:4px;width:44px;height:44px;border:0;background:none;cursor:pointer}.banner{display:flex;align-items:flex-start;gap:10px;padding:16px;border-radius:12px;margin-bottom:20px;font-size:.9375rem}.banner-danger{background:var(--danger-bg);color:var(--danger-ink)}.banner-warning{background:var(--warning-bg);color:var(--warning-ink)}.banner-info{background:var(--accent-soft);color:var(--accent-ink)}.banner-success{background:var(--success-bg);color:var(--success-ink)}.badge{display:inline-flex;align-items:center;gap:4px;height:28px;padding:0 12px;border-radius:999px;font-size:.8125rem;line-height:1;white-space:nowrap}.badge-success{background:var(--success-bg);color:var(--success-ink)}.badge-warning{background:var(--warning-bg);color:var(--warning-ink)}.badge-info{background:var(--accent-soft);color:var(--accent-ink)}.badge-danger{background:var(--danger-bg);color:var(--danger-ink)}.badge-neutral{background:var(--surface);color:var(--ink-2)}.progress{height:6px;border-radius:999px;background:var(--surface-pressed);overflow:hidden}.progress>span{display:block;height:100%;background:var(--accent)}.enrollment-card{display:flex;flex-direction:column;gap:12px;padding:20px;border:1px solid var(--line);border-radius:12px;background:var(--bg)}.enrollment-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.enrollment-title{display:flex;align-items:center;min-width:44px;min-height:44px;color:inherit;text-decoration:none}.enrollment-title:hover{color:var(--accent)}.enrollment-title h2{font-size:1.125rem;line-height:1.4}.type-label{color:var(--ink-2);font-size:.8125rem}.empty{display:flex;flex-direction:column;align-items:center;gap:10px;padding:48px 20px;text-align:center;color:var(--ink-2)}.empty-disc{display:grid;place-items:center;width:72px;height:72px;border-radius:50%;background:var(--surface);color:var(--ink-2);margin-bottom:6px}.empty h2{color:var(--ink);font-size:1.375rem}.detail-layout{display:block}.detail-main{min-width:0}.back-link{display:inline-flex;align-items:center;gap:6px;min-height:44px;color:var(--accent);text-decoration:none;font-size:.9375rem;margin-bottom:12px}.detail-summary{color:var(--ink-2);margin-top:12px;font-size:1.0625rem}.detail-meta{display:flex;align-items:baseline;gap:16px;margin:20px 0 8px}.divider{height:1px;background:var(--line);margin:28px 0}.prose{max-width:65ch;margin-top:12px;font-size:1.0625rem;line-height:1.65}.lesson-list{list-style:none;margin-top:12px;border-top:1px solid var(--line)}.lesson-list li{display:flex;gap:16px;align-items:baseline;min-height:52px;padding:14px 0;border-bottom:1px solid var(--line)}.lesson-no{min-width:2ch;color:var(--ink-2);font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.notice{display:flex;align-items:flex-start;gap:8px;margin-top:16px;color:var(--ink-2);font-size:.8125rem}.summary-card{margin-top:32px;padding:20px;border:1px solid var(--line);border-radius:12px;background:var(--bg)}.summary-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.summary-head h2{margin:4px 0 0;font-size:1.125rem;line-height:1.4}.summary-card .price{font-size:1.75rem}.desktop-summary{display:none}.summary-card .button{margin-top:16px}.sticky-bar{position:fixed;left:0;right:0;bottom:0;z-index:15;background:var(--bg);border-top:1px solid var(--line);padding:12px 20px calc(12px + env(safe-area-inset-bottom, 0px))}.sticky-bar-inner{max-width:1120px;margin:0 auto;display:flex;align-items:center;gap:16px}.sticky-bar .button{flex:1 1}.has-sticky-bar{padding-bottom:120px}.center-state{max-width:560px;margin:48px auto;padding:0 20px;text-align:center}.state-icon{display:grid;place-items:center;width:56px;height:56px;margin:0 auto 20px;border-radius:50%;background:var(--surface)}.state-icon.success{background:var(--success-bg);color:var(--success-ink)}.state-icon.warning{background:var(--warning-bg);color:var(--warning-ink)}.state-icon.danger{background:var(--danger-bg);color:var(--danger-ink)}.center-state h1{margin-bottom:12px}.center-state p{color:var(--ink-2);margin-bottom:24px}.center-state .actions{justify-content:center}.spinner{width:20px;height:20px;border:2px solid var(--surface-pressed);border-top-color:var(--accent);border-radius:50%;animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.summary-list{display:grid;grid-template-columns:auto 1fr;grid-gap:8px 20px;gap:8px 20px;margin:20px 0;font-size:.9375rem}.summary-list dt{color:var(--ink-2)}.summary-list dd{margin:0;text-align:right;overflow-wrap:anywhere}.order-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:8px}.timeline{list-style:none;margin:24px 0;border-left:1px solid var(--line);padding-left:20px}.timeline li{position:relative;padding:0 0 20px}.timeline li:before{content:"";position:absolute;left:-25px;top:6px;width:9px;height:9px;border-radius:50%;background:var(--surface-pressed)}.timeline li.done:before{background:var(--accent)}.timeline .time{color:var(--ink-2);font-size:.8125rem}.login-wrap{max-width:440px;margin:0 auto}.hint{margin-top:20px;padding:12px 16px;border-radius:12px;background:var(--accent-soft);color:var(--accent-ink);font-size:.8125rem}.pagination{display:flex;align-items:center;justify-content:center;gap:16px;margin-top:32px}.pagination a,.pagination span{min-height:44px;display:inline-flex;align-items:center;padding:0 14px;border-radius:12px;text-decoration:none;font-size:.9375rem}.pagination a{border:1px solid var(--control-line);color:var(--ink)}.pagination .disabled{color:var(--disabled-ink);border:1px solid var(--line)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media (min-width:768px){.header-inner{min-height:64px;padding:0 24px}.page{padding:40px 24px 96px}.hero h1{font-size:3rem;line-height:1.16}.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.button{min-height:44px}}@media (min-width:1024px){.header-inner,.page{padding-left:40px;padding-right:40px}.course-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.desktop-summary{display:block}.detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;grid-gap:56px;gap:56px;align-items:start}.summary-card{position:-webkit-sticky;position:sticky;top:88px;margin-top:56px}.sticky-bar{display:none}.has-sticky-bar{padding-bottom:96px}}@media 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