:root{--brand:#1b4f5a;--brand-ink:#0f2e33;--bg:#f5f6f3;--ink:#15282c;--muted:#4f5f62;--line:#d9dfdd;--line-soft:#e6eae8;--field-line:#9fb0b2;--soft:#e2ecec;--warm:#fbebd3;--warm-ink:#5c3408;--danger:#9b2c1f;--ok:#1d5b3a;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;color:var(--ink);background:var(--bg);-webkit-text-size-adjust:100%;font-family:-apple-system,BlinkMacSystemFont,PingFang TC,Noto Sans CJK TC,Noto Sans TC,Microsoft JhengHei,system-ui,sans-serif;font-size:18px;line-height:1.7}*{box-sizing:border-box}body{background:var(--bg);margin:0}a{color:var(--brand)}button,input{font:inherit}h1{margin:0;font-size:28px;line-height:1.35}h2{margin:6px 0 0;font-size:20px;line-height:1.4}p{margin:0}.app{flex-direction:column;max-width:720px;min-height:100vh;margin:0 auto;display:flex}.page{flex-direction:column;flex:1;gap:20px;padding:4px 20px 32px;display:flex}.stack{flex-direction:column;gap:20px;display:flex}.stack-sm{flex-direction:column;gap:12px;display:flex}.stack-xs{flex-direction:column;gap:4px;display:flex}.row-gap{align-items:center;gap:10px;display:flex}.row-gap.wrap{flex-wrap:wrap}.muted{color:var(--muted)}.small{font-size:15px}.strong{font-weight:700}.center{text-align:center}.mono{word-break:break-all;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:16px}.topbar{justify-content:space-between;align-items:center;gap:12px;min-height:56px;padding:12px 12px 12px 20px;display:flex}.site-name{color:var(--brand-ink);font-size:17px;font-weight:700}.topbar-account{align-items:center;gap:6px;min-height:44px;padding:0 10px;font-size:16px;font-weight:500;text-decoration:none;display:flex}.back{align-items:center;gap:4px;min-height:48px;padding:0 16px;font-size:17px;font-weight:500;text-decoration:none;display:flex}.footer{flex-wrap:wrap;gap:4px 18px;padding:4px 20px 28px;font-size:16px;display:flex}.footer a{align-items:center;min-height:44px;display:flex}.notice,.inapp-banner{background:var(--warm);color:var(--warm-ink);align-items:flex-start;gap:10px;padding:12px 16px 12px 20px;font-size:16px;line-height:1.6;display:flex}.icon-lead{flex-shrink:0;margin-top:2px}.inapp-banner-text{flex:1}.inapp-banner-close{min-width:44px;min-height:44px;color:var(--warm-ink);cursor:pointer;background:0 0;border:none;flex-shrink:0;margin:-10px -6px -10px 0;padding:0 10px;font-size:16px;font-weight:700;text-decoration:underline}.inapp-jumping{background:var(--soft);color:var(--brand-ink);padding:12px 20px;font-size:16px}.btn{text-align:center;cursor:pointer;border:1px solid #0000;border-radius:12px;justify-content:center;align-items:center;gap:8px;width:100%;min-height:56px;padding:8px 18px;font-size:19px;font-weight:700;text-decoration:none;display:flex}.btn:disabled{opacity:.5;cursor:default}.btn-primary{background:var(--brand);color:#fff}.btn-secondary{color:var(--brand);border-color:var(--brand);background:#fff;min-height:52px;font-size:18px}.btn-danger{background:var(--danger);color:#fff}.btn-light{color:var(--brand-ink);background:#fff;min-height:48px;font-size:17px}.btn-done.on{background:var(--soft);color:var(--brand-ink);min-height:52px;font-size:18px}.btn-small{width:auto;min-height:44px;color:var(--brand);border-color:var(--brand);background:#fff;padding:4px 14px;font-size:16px}.btn-outline-danger{color:var(--danger);border-color:var(--danger)}.text-btn,.text-link{text-align:left;min-height:44px;color:var(--brand);cursor:pointer;background:0 0;border:none;align-items:center;padding:0;font-size:17px;text-decoration:underline;display:flex}.danger-link{color:var(--muted)}.error-text{color:var(--danger);font-size:16px;line-height:1.6}.ok-text{background:var(--soft);color:var(--brand-ink);border-radius:12px;padding:12px 16px;font-size:17px}.warn-text{color:var(--warm-ink);font-size:15px}.loading{color:var(--muted)}.field{flex-direction:column;gap:8px;display:flex}.field label{font-weight:500}.field input,.search{border:1px solid var(--field-line);height:56px;color:var(--ink);background:#fff;border-radius:12px;width:100%;padding:0 16px;font-size:19px}.field input[aria-invalid=true]{border-color:var(--danger)}.field input.code-input{letter-spacing:12px;text-align:center;height:64px;font-size:30px}.help-box{border:1px solid var(--line);background:#fff;border-radius:12px;flex-direction:column;gap:6px;padding:14px 16px;font-size:16px;display:flex}.help-box .text-btn{font-size:16px}.turnstile-box{margin-top:12px}.turnstile-box:empty{display:none}.help-title{font-weight:700}.check{cursor:pointer;align-items:flex-start;gap:12px;min-height:44px;font-size:17px;display:flex}.check input{flex-shrink:0;width:24px;height:24px;margin:4px 0 0}.card{border:1px solid var(--line);background:#fff;border-radius:16px;margin:0;padding:18px}.card-link{color:var(--ink);text-decoration:none}.card-title{font-size:21px;font-weight:700;line-height:1.45}.card-subtitle{margin:0;font-size:18px}.badge{background:var(--warm);color:var(--warm-ink);border-radius:999px;align-self:flex-start;padding:2px 10px;font-size:14px;font-weight:700}.pill{background:var(--soft);color:var(--brand-ink);border-radius:999px;flex-shrink:0;padding:2px 10px;font-size:14px;font-weight:700}.tag{background:var(--soft);color:var(--brand-ink);border-radius:999px;margin-left:8px;padding:0 8px;font-size:13px;font-weight:700;display:inline-block}.more-link{color:var(--brand);align-items:center;gap:4px;font-size:17px;font-weight:700;display:flex}.soft-box{background:var(--bg);border-radius:12px;align-items:flex-start;gap:10px;padding:12px 14px;font-size:16px;line-height:1.6;display:flex}.soft-box-warm{background:var(--warm);color:var(--warm-ink)}.soft-box-warm .btn-secondary{color:var(--brand)}.small-title{font-size:16px;font-weight:700}.plain-list{flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.trial-link{min-height:44px;color:var(--ink);align-items:center;gap:8px;font-size:17px;text-decoration:none;display:flex}.bar{background:var(--soft);border-radius:999px;height:8px;overflow:hidden}.bar-fill{background:var(--brand);height:8px}.email-full{word-break:break-all;font-size:19px;font-weight:500}.section-card{border:1px solid var(--line);background:#fff;border-radius:16px;overflow:hidden}.section-title{background:var(--soft);color:var(--brand-ink);margin:0;padding:12px 16px;font-size:17px}.lesson-row{min-height:64px;color:var(--ink);border-top:1px solid var(--line-soft);align-items:center;gap:12px;padding:10px 16px;text-decoration:none;display:flex}.section-title+.lesson-row{border-top:none}.lesson-row.partial{background:var(--warm)}.lesson-row.partial .lesson-row-meta{color:var(--warm-ink)}.row-icon{flex-shrink:0}.lesson-row-text{flex-direction:column;flex-grow:1;display:flex}.lesson-row-title{font-size:17px;line-height:1.5}.lesson-row-meta{color:var(--muted);font-size:14px}.player{background:#fff}.player-frame{aspect-ratio:16/9;background:var(--brand-ink);color:#fff;justify-content:center;align-items:center;width:100%;display:flex;position:relative}.player-video{background:#000;width:100%;height:100%}.player-video.hidden{display:none}.player-loading{color:#fff;font-size:16px;position:absolute}.player-resume{color:#fff;pointer-events:none;background:#0009;border-radius:6px;padding:2px 10px;font-size:15px;position:absolute;top:12px;left:14px}.player-msg{flex-direction:column;gap:10px;max-width:560px;padding:16px 20px;font-size:16px;line-height:1.6;display:flex}.speed-bar{border-bottom:1px solid var(--line);flex-wrap:wrap;align-items:center;gap:8px;padding:10px 16px;display:flex}.speed-label{color:var(--muted);margin-right:2px;font-size:15px}.speed-btn{border:1px solid var(--field-line);min-width:56px;min-height:44px;color:var(--ink);cursor:pointer;background:#fff;border-radius:10px;padding:0 10px;font-size:16px;font-weight:500}.speed-btn.on{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:700}.lesson-title{font-size:25px;line-height:1.4}.lesson-body{font-size:18px;line-height:1.8}.lesson-body p{margin:0 0 1em}.lesson-body h2,.lesson-body h3{margin:1.2em 0 .4em}.points{flex-direction:column;gap:6px;margin:0;padding-left:1.2em;font-size:17px;display:flex}.handout{border:1px solid var(--line);min-height:60px;color:var(--ink);text-align:left;cursor:pointer;background:#fff;border-radius:12px;align-items:center;gap:12px;width:100%;padding:8px 16px;display:flex}.handout-text{flex-direction:column;flex-grow:1;display:flex}.handout-title{font-size:18px;font-weight:500}.lesson-nav{flex-direction:column;gap:12px;display:flex}.next-btn{background:var(--brand);color:#fff;border-radius:12px;flex-direction:column;justify-content:center;gap:2px;min-height:72px;padding:8px 18px;text-decoration:none;display:flex}.next-label{opacity:.9;font-size:15px}.next-title{font-size:19px;font-weight:700;line-height:1.4}.next-locked{background:var(--soft);min-height:56px;color:var(--brand-ink);text-align:center;border-radius:12px;justify-content:center;align-items:center;padding:8px 18px;font-weight:700;display:flex}.device-list{padding:4px 18px;list-style:none}.device-row{border-top:1px solid var(--line-soft);padding:12px 0;font-size:17px}.device-row:first-child{border-top:none}.device-this{color:var(--brand);font-weight:700}.dialog-backdrop{z-index:10;background:#0f2e338c;justify-content:center;align-items:flex-end;padding:16px;display:flex;position:fixed;inset:0}.dialog{background:#fff;border-radius:16px;flex-direction:column;gap:16px;width:100%;max-width:520px;padding:20px;display:flex}.dialog-text{font-size:18px;line-height:1.7}.dialog-actions{flex-direction:column;gap:10px;display:flex}@media (width>=600px){.dialog-backdrop{align-items:center}}.ops-tabs{border-bottom:1px solid var(--line);gap:4px;padding:0 12px;display:flex}.ops-tab{min-height:48px;color:var(--muted);border-bottom:3px solid #0000;align-items:center;padding:0 14px;font-weight:500;text-decoration:none;display:flex}.ops-tab.on{color:var(--brand-ink);border-bottom-color:var(--brand);font-weight:700}.ops-page{padding-top:16px}.ops-list{padding:4px 16px;list-style:none}.ops-list>li+li{border-top:1px solid var(--line-soft)}.ops-row{min-height:52px;color:var(--ink);flex-direction:column;justify-content:center;padding:8px 0;text-decoration:none;display:flex}.ops-course-row,.switch-row{justify-content:space-between;align-items:center;gap:12px;min-height:60px;padding:8px 0;display:flex}.ops-course-title{font-weight:500}.action-row{flex-direction:column;padding:10px 0;font-size:15px;display:flex}.switch{background:var(--field-line);cursor:pointer;border:none;border-radius:999px;flex-shrink:0;width:60px;height:34px;padding:0;position:relative}.switch.on{background:var(--brand)}.switch-knob{background:#fff;border-radius:999px;width:26px;height:26px;transition:left .15s;position:absolute;top:4px;left:4px}.switch.on .switch-knob{left:30px}.offscreen{position:fixed;top:0;left:-9999px}