:root{color-scheme:light;--ink:#192830;--muted:#6b7a83;--line:#e2e9ec;--accent:#087d73;--bg:#f6f8fa}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,"Segoe UI","Microsoft YaHei",system-ui,sans-serif;font-size:15px;line-height:1.6}button,input,textarea{font:inherit}button,a,input,textarea{-webkit-tap-highlight-color:transparent}a{color:inherit}button,a{touch-action:manipulation}[hidden]{display:none!important}.wrap{max-width:1020px;margin:auto;padding-left:28px;padding-right:28px}.header{height:96px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:18px;font-weight:750;letter-spacing:.2px}.header-note{font-size:13px;color:var(--muted)}.intro{padding:60px 0 28px}.eyebrow{color:var(--accent);font-size:11px;letter-spacing:2.5px;font-weight:750}h1{font-size:44px;line-height:1.25;letter-spacing:-1.8px;margin:14px 0 17px}h2{font-size:20px;line-height:1.6;margin:15px 0 8px}h3{font-size:15px;margin:0 0 6px}.intro p{margin:0;color:var(--muted)}.mobile-break{display:none}.card{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 8px 32px #233b4a04}.input-card{padding:26px}.label-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}label{font-weight:650}.text-button{border:0;background:none;color:var(--muted);padding:5px 0 5px 16px;cursor:pointer;font-size:13px}textarea{display:block;width:100%;resize:vertical;min-height:130px;max-height:300px;border:1px solid #d9e2e6;border-radius:11px;padding:17px;background:#fbfcfd;outline:none;color:var(--ink);line-height:1.8}textarea::placeholder{color:#99a5ae}textarea:focus,input:focus{border-color:var(--accent);box-shadow:0 0 0 3px #087d7310}.form-bottom{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:18px}.hint{color:var(--muted);font-size:13px}.primary{display:inline-flex;align-items:center;justify-content:center;gap:28px;padding:13px 22px;border:0;border-radius:9px;background:var(--accent);color:white;font-weight:650;text-decoration:none;cursor:pointer;transition:background .15s}.primary:hover{background:#05695f}.primary b{font-size:20px;line-height:1}.primary:disabled{opacity:.55;cursor:wait}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #78c9c1;outline-offset:3px}.progress{margin-top:22px;border-top:1px solid var(--line);padding-top:20px;display:flex;gap:14px;align-items:center}.progress strong{font-size:14px}.progress p{font-size:13px;color:var(--muted);margin:4px 0 0}.spinner{width:20px;height:20px;flex:none;border:2px solid #d8ece9;border-top-color:var(--accent);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.error{color:#b53042;font-size:14px;overflow-wrap:anywhere}.input-card>.error{padding:14px;background:#fff5f5;border-radius:8px;margin:18px 0 0}.result{display:grid;grid-template-columns:38% 1fr;overflow:hidden;margin-top:24px}.video-shell{background:#111b22;display:flex;align-items:center;justify-content:center;min-height:330px}video{display:block;width:100%;height:440px;object-fit:contain}.video-info{padding:30px;align-self:center;min-width:0}.video-info h2{overflow-wrap:anywhere}.ready-badge{color:var(--accent);font-size:12px;font-weight:650;background:#edf7f4;border-radius:6px;padding:5px 9px}.muted{color:var(--muted)}.facts{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0}.facts span{font-size:12px;background:#f2f5f7;color:#566873;padding:5px 8px;border-radius:5px}.download{width:100%;justify-content:space-between}.official{display:block;font-size:13px;text-decoration:none;text-align:center;padding:13px;color:#657680}.official:hover{color:var(--accent)}.small{font-size:12px}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:36px;margin:40px 0}.steps>div{position:relative;padding-left:36px}.steps>div>span{position:absolute;left:0;top:0;font-size:12px;color:#8da29f;font-weight:600;line-height:24px}.steps p{font-size:13px;color:var(--muted);margin:0}.help{border-top:1px solid var(--line);padding:20px 0;color:var(--muted);font-size:13px}.help summary{cursor:pointer}.help p{max-width:760px}.secondary{background:#fff;border:1px solid var(--line);color:var(--ink);border-radius:7px;padding:8px 16px;cursor:pointer}#check-results{list-style:none;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:7px}.check-ok{color:var(--accent)}.footer{display:flex;justify-content:space-between;font-size:12px;color:#8a979f;margin-top:25px;padding-top:20px;padding-bottom:35px}.login{padding:26px;max-width:440px;margin-bottom:55px}.login h2{margin-top:0}.login label{display:block;font-size:13px;margin-bottom:8px}.login input{border:1px solid var(--line);border-radius:8px;padding:11px;width:100%;outline:none}.login button{margin-top:15px}
@media(max-width:640px){.wrap{padding-left:20px;padding-right:20px}.header{height:78px}.brand{font-size:16px}.header-note{display:none}.intro{padding:36px 0 24px}h1{font-size:34px;letter-spacing:-1px}.mobile-break{display:block}.intro p{font-size:14px}.input-card{padding:18px}.form-bottom{display:block}.hint{display:block;font-size:12px;margin-bottom:13px}.primary{width:100%}textarea{min-height:145px;font-size:14px}.result{grid-template-columns:1fr}.video-shell{min-height:0}video{height:360px}.video-info{padding:23px}.steps{grid-template-columns:1fr;gap:22px;margin:30px 0}.steps>div{padding-left:36px}.footer{display:block;line-height:2}.footer span{display:block}#check-results{grid-template-columns:1fr}}
#diagnostic{margin-top:18px}#diagnostic pre{white-space:pre-wrap;overflow-wrap:anywhere;max-height:340px;overflow:auto;color:var(--ink);background:#f6f8fa;padding:14px;border-radius:8px;font-size:12px}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}