:root{color-scheme:light;--ink:#18202a;--muted:#687482;--line:#dfe4e8;--paper:#fff;--bg:#f3f5f6;--accent:#1972d2;--accent-dark:#1259a6;--green:#14805e;--danger:#b23a3a}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,"Microsoft YaHei",system-ui,sans-serif;color:var(--ink);letter-spacing:0}body{background:var(--bg);display:flex;flex-direction:column}.topbar{height:64px;padding:0 max(24px,calc((100% - 960px)/2));display:flex;align-items:center;justify-content:space-between;background:#18202a;color:#fff}.brand{display:flex;align-items:center;gap:10px;font-size:16px;font-weight:700}.brand-mark{width:30px;height:30px;display:grid;place-items:center;background:#fff;color:#18202a;border-radius:4px;font-size:14px}.secure-label{font-size:13px;color:#b9e2d5}main{width:min(100% - 32px,640px);margin:52px auto 32px;flex:1}.intro{text-align:center;margin-bottom:24px}.eyebrow{margin:0 0 8px;color:var(--accent);font-size:13px;font-weight:700}.intro h1{margin:0;font-size:30px;line-height:1.3}.subtitle{margin:10px 0 0;color:var(--muted);font-size:15px}.code-panel{background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:38px 40px 32px;text-align:center;box-shadow:0 8px 24px rgba(24,32,42,.06)}.status-icon{width:12px;height:12px;margin:0 auto 12px;border-radius:50%;background:var(--green)}.status-icon.loading{background:transparent;border:2px solid #c8d1da;border-top-color:var(--accent);animation:spin .8s linear infinite}.status-icon.error{background:var(--danger)}@keyframes spin{to{transform:rotate(360deg)}}.status-text{min-height:20px;margin:0 0 13px;color:var(--green);font-size:14px}.status-text.error{color:var(--danger)}.code-button{width:100%;height:88px;border:1px solid #cdd8e3;border-radius:6px;background:#f8fafc;color:var(--ink);display:flex;align-items:center;justify-content:center;gap:16px;cursor:pointer}.code-button:not(:disabled):hover{border-color:var(--accent);background:#f4f9ff}.code-button:disabled{cursor:default}.otp-code{font:700 44px/1 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:5px}.copy-icon{font-size:22px;color:var(--accent)}.copy-feedback{height:20px;margin:8px 0 0;color:var(--green);font-size:13px}.timer-wrap{margin-top:14px}.timer-track{height:6px;background:#e4e9ed;border-radius:3px;overflow:hidden}.timer-bar{height:100%;width:100%;background:var(--accent);transform-origin:left;transition:width .2s linear}.timer-meta{display:flex;justify-content:space-between;margin-top:10px;color:var(--muted);font-size:13px}.retry-button{height:40px;margin-top:12px;padding:0 22px;border:0;border-radius:5px;background:var(--accent);color:#fff;font-weight:700;cursor:pointer}.retry-button:hover{background:var(--accent-dark)}.notice{display:flex;gap:14px;margin-top:16px;padding:18px 20px;border-left:3px solid var(--accent);background:#eaf2fa}.notice-symbol{width:22px;height:22px;flex:0 0 22px;display:grid;place-items:center;border:1px solid var(--accent);border-radius:50%;color:var(--accent);font-weight:700}.notice h2{margin:1px 0 5px;font-size:14px}.notice p{margin:0;color:#536273;font-size:13px;line-height:1.7}footer{text-align:center;padding:0 16px 24px;color:#8a949e;font-size:12px}@media(max-width:520px){.topbar{height:56px;padding:0 16px}main{width:calc(100% - 24px);margin:30px auto 24px}.intro h1{font-size:25px}.code-panel{padding:30px 18px 25px}.code-button{height:76px}.otp-code{font-size:34px;letter-spacing:3px}.copy-icon{font-size:18px}.notice{padding:16px}.secure-label{font-size:12px}}