:root{font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:#152638;background:#f4f7fb;font-synthesis:none;--blue:#155bea;--muted:#65758a;--line:#e2e9f2}*{box-sizing:border-box}body{margin:0}button,input,a{-webkit-tap-highlight-color:transparent}button,input{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:wait;opacity:.55}a{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #84acff;outline-offset:4px}[hidden]{display:none!important}.topbar{height:88px;max-width:1120px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:0 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0}#notice.error{background:#fff1ef;color:#a53627}#result{margin-top:28px;padding-top:26px;border-top:1px solid var(--line)}.video-summary{display:flex;align-items:center;gap:20px;margin-bottom:25px}.video-summary img{width:160px;height:90px;object-fit:cover;border-radius:9px;background:#e5ebf4}.video-summary .eyebrow{font-size:11px;margin-bottom:6px}h2{font-size:18px;line-height:1.5;margin:0;overflow-wrap:anywhere}#meta{font-size:13px;color:var(--muted);margin:8px 0 0}.tabs{display:flex;gap:24px;border-bottom:1px solid var(--line);margin-bottom:18px}.tabs button{border:0;background:none;color:var(--muted);font-size:15px;padding:12px 6px;border-bottom:2px solid transparent}.tabs button[aria-selected=true]{color:var(--blue);border-bottom-color:var(--blue);font-weight:650}.formats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.format{border:1px solid 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var(--line);margin-top:24px;padding-top:24px}#task-title{font-size:14px;color:var(--muted);line-height:1.6;overflow-wrap:anywhere}progress{display:block;width:100%;height:8px;border:0;border-radius:10px;background:#e7eef9;accent-color:var(--blue);overflow:hidden}progress::-webkit-progress-bar{background:#e7eef9}progress::-webkit-progress-value{background:var(--blue)}#save{margin-top:18px}.how{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;margin:36px 10px}.how>div>span{font-size:12px;letter-spacing:1px;color:#92a2b7}.how h3{font-size:15px;margin:10px 0 8px}.how p{font-size:13px;color:var(--muted);margin:0;line-height:1.7}.help{border-top:1px solid var(--line);padding:20px 0;font-size:14px;color:var(--muted);line-height:1.8}.help summary{cursor:pointer;color:#344861}footer{max-width:1120px;margin:38px auto 0;padding:24px 32px 28px;display:flex;justify-content:space-between;gap:20px;align-items:center;border-top:1px solid var(--line);font-size:12px;color:#77879b}footer>span{font-weight:600}footer p{margin:0;line-height:1.8}@media(max-width:640px){.topbar{height:72px;padding:0 20px}.brand{font-size:18px}.edition{font-size:12px;padding:5px 9px}main{padding:0 16px;margin-top:26px}.intro{margin-bottom:26px}h1{font-size:32px;letter-spacing:-1px}.mobile-break{display:block}.lead{font-size:14px}.workspace{padding:21px 18px;border-radius:16px}.input-row{flex-direction:column}.input-row input{width:100%;flex:auto;font-size:14px}.input-row button{width:100%;min-height:48px}.limits{gap:7px 10px;font-size:11px}.video-summary{align-items:flex-start;gap:12px}.video-summary img{width:100px;height:64px}h2{font-size:16px}.formats{grid-template-columns:repeat(2,1fr)}.how{gap:15px;margin:28px 4px}.how p{font-size:12px}.how h3{font-size:14px}footer{padding:20px;display:block;margin-top:18px}footer p{margin-top:8px}}@media(prefers-reduced-motion:no-preference){button,a{transition:background .15s ease}}