:root{color-scheme:light;--ink:#193e45;--muted:#648087;--line:#d8e8e8;--accent:#186e72;--bg:#f4f9f8;font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink)}*{box-sizing:border-box}body{margin:0;min-height:100vh}.aurora{position:fixed;inset:0;z-index:-1;background:radial-gradient(ellipse at 90% 5%,#cae8df80,transparent 55%),radial-gradient(ellipse at 0% 55%,#d8eaf180,transparent 60%)}header{max-width:1100px;margin:auto;padding:32px 36px;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{color:var(--ink);text-decoration:none;font-size:22px;font-weight:700;display:flex;align-items:center;gap:10px}.brand small{font-size:13px;font-weight:400;color:var(--muted)}.logo{display:inline-grid;place-items:center;background:var(--accent);color:white;border-radius:12px;width:40px;height:40px;font-size:30px}.tag,.pill{font-size:12px;background:#e3efea;color:#31695b;padding:7px 12px;border-radius:30px}main{max-width:980px;margin:32px auto;padding:0 24px}.login-layout{display:grid;grid-template-columns:1fr 1.2fr;gap:48px;align-items:start}.intro{padding:30px 0}.eyebrow{font-size:12px;letter-spacing:2px;color:var(--accent);font-weight:600}h1{font-size:42px;line-height:1.25;letter-spacing:-1px;margin:16px 0}h2{font-size:22px;margin:0 0 18px}h3{font-size:16px}p{line-height:1.75;color:var(--muted)}.card{background:#ffffffda;border:1px solid var(--line);border-radius:22px;padding:28px;margin-bottom:20px;box-shadow:0 15px 50px #1f565908}.intro .steps{margin-top:30px;border-top:1px solid var(--line);padding-top:20px;font-size:14px;color:var(--muted);line-height:2.2}.account{display:flex;align-items:center;gap:15px;border:1px solid var(--line);border-radius:14px;padding:16px;cursor:pointer;margin:12px 0;background:#fff;width:100%;text-align:left;color:var(--ink)}.avatar{border-radius:50%;width:44px;height:44px;background:#e7f3f1;display:grid;place-items:center;font-size:22px}.account strong{display:block;font-size:15px}.account small{font-size:12px;color:var(--muted)}button{font:inherit;font-size:14px;cursor:pointer;padding:11px 18px;background:var(--accent);color:white;border:0;border-radius:10px}button:hover{filter:brightness(1.07)}button:disabled{opacity:.5;cursor:not-allowed}.secondary{background:#e7f0ee;color:var(--ink)}.danger{background:#fae9e8;color:#9c4141}.notice{border-radius:12px;padding:14px 16px;background:#f7f0dc;color:#84662e;font-size:13px;line-height:1.7;margin:14px 0}.code{display:block;border:1px dashed #84afad;background:#eef7f5;border-radius:12px;padding:20px 12px;font:600 19px ui-monospace,monospace;text-align:center;word-break:break-all;color:#175958}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.muted{font-size:13px;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.future{border:1px solid var(--line);padding:18px;border-radius:13px}.future strong{display:block;margin-bottom:8px}.title-row{display:flex;justify-content:space-between;gap:20px;align-items:center}.session-row{padding:14px 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:12px;align-items:center}a{color:var(--accent)}pre{white-space:pre-wrap;overflow-wrap:anywhere;font-size:12px;color:var(--muted)}footer{text-align:center;font-size:12px;color:var(--muted);padding:40px 20px}.error{color:#a53737;line-height:1.6;min-height:1em}dialog{border:1px solid var(--line);border-radius:16px;max-width:420px;padding:24px}dialog::backdrop{background:#1236}.spinner{display:inline-block;width:12px;height:12px;border:2px solid #b9d7d5;border-top-color:var(--accent);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}:focus-visible{outline:3px solid #65bfb5;outline-offset:3px}@media(max-width:760px){header{padding:22px}.brand small{display:none}main{margin-top:0}.login-layout{grid-template-columns:1fr;gap:8px}.intro{padding:12px 0}.intro h1{font-size:32px}.intro .steps{display:none}.card{padding:22px}.grid{grid-template-columns:1fr}.title-row{align-items:flex-start}h1{font-size:32px}}@media(prefers-reduced-motion:reduce){.spinner{animation:none}}