:root{--bg:#0f1218;--card:#171b23;--line:#262c38;--fg:#e6e9ef;--mut:#8a93a6;--acc:#3b82f6;--in:#0f1218;--hov:#1d2330;--err:#f6465d;--errbg:#2a1a1f;color-scheme:dark}
:root[data-theme=light]{--bg:#ffffff;--card:#ffffff;--line:#e3e6ec;--fg:#11141a;--mut:#5b6475;--acc:#2563eb;--in:#ffffff;--hov:#f2f5fa;--err:#d92d43;--errbg:#fff0f2;color-scheme:light}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:14px/1.45 -apple-system,"PingFang SC","Microsoft YaHei",sans-serif;min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;align-items:center}
/* 登录页：logo+卡片+页脚 作为一组，光学居中（上方留白:下方 = 45:55） */
body::before,body::after{content:"";display:block}
body::before{flex:9 1 24px}
body::after{flex:11 1 calc(16px + env(safe-area-inset-bottom))}
header{display:flex;align-items:center;gap:10px;padding:10px 12px;border-bottom:1px solid var(--line);background:var(--bg);flex-wrap:wrap}
header h1{font-size:16px;margin:0}.sp{flex:1}
.mut{color:var(--mut);font-size:12px}
.btn{background:var(--card);color:var(--fg);border:1px solid var(--line);border-radius:6px;padding:6px 10px;font-size:14px;cursor:pointer}
.btn:hover{background:var(--hov)}#thBtn{min-width:64px}
.btn.pri{background:var(--acc);border-color:var(--acc);color:#fff;width:100%;padding:9px 10px;margin-top:6px;font-size:15px}
.btn.pri:hover{filter:brightness(1.08)}.btn.pri:disabled{opacity:.6;cursor:wait}
.btn.ghost{background:transparent;color:var(--mut);font-size:12px;padding:6px 8px;white-space:nowrap}
main{flex:0 0 auto;width:100%;display:flex;flex-direction:column;align-items:center;padding:0 16px}
.logo{display:block;width:60px;height:60px;border-radius:13px;margin:0 0 18px;box-shadow:0 0 0 1px var(--line)}
:root[data-theme=light] .logo{box-shadow:0 1px 2px rgba(15,23,42,.08),0 6px 16px -8px rgba(15,23,42,.25)}
.site-foot{flex:0 0 auto;text-align:center;white-space:pre-wrap;color:var(--mut);font-size:12px;opacity:.85;margin-top:40px;padding:0 16px}
@media (max-height:640px),(max-width:480px){.site-foot{margin-top:32px}}
.card{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:22px 22px 20px;width:100%;max-width:360px}
:root[data-theme=light] .card{box-shadow:0 1px 2px rgba(15,23,42,.05),0 12px 32px -18px rgba(15,23,42,.18)}
h2{margin:0 0 2px;font-size:18px}
label{display:block;margin:14px 0 5px;color:var(--mut);font-size:12px}
input{width:100%;background:var(--in);color:var(--fg);border:1px solid var(--line);border-radius:6px;padding:8px 10px;font-size:15px}
input:focus{outline:none;border-color:var(--acc);box-shadow:0 0 0 3px color-mix(in srgb,var(--acc) 25%,transparent)}
.pw{display:flex;gap:6px}
#eye{display:inline-flex;align-items:center;justify-content:center;align-self:stretch;width:40px;padding:0;flex:none}#eye svg{display:block}#eye .ic-off{display:none}#eye[aria-pressed="true"] .ic-open{display:none}#eye[aria-pressed="true"] .ic-off{display:block}#eye:focus-visible{outline:2px solid var(--acc);outline-offset:2px}
.err{min-height:20px;margin:10px 0 4px;font-size:13px;color:var(--err)}
.err.on{background:var(--errbg);border-radius:4px;padding:6px 8px}
/* 图形验证码（失败 ≥2 次后出现） */
.cap[hidden]{display:none}
.caprow{display:flex;gap:8px;align-items:stretch}
.caprow input{flex:1;min-width:0;height:40px;text-transform:uppercase;letter-spacing:.12em}
.caprow input::placeholder{text-transform:none;letter-spacing:0;color:var(--mut);opacity:.75}
.capimg{flex:0 0 auto;width:111px;height:40px;padding:0;border:1px solid var(--line);border-radius:6px;background:var(--in);cursor:pointer;overflow:hidden;display:flex;align-items:center;justify-content:center}
.capimg:hover{border-color:var(--acc)}
.capimg:focus-visible{outline:none;border-color:var(--acc);box-shadow:0 0 0 3px color-mix(in srgb,var(--acc) 25%,transparent)}
.capimg img{display:block;width:109px;height:38px;object-fit:cover}
.capimg.loading img{opacity:.35}
.caplink{display:block;margin:5px 0 0 auto;padding:0;border:0;background:none;color:var(--mut);font-size:12px;cursor:pointer}
.caplink:hover{color:var(--acc)}