:root { --blue:#0093DD; --yellow:#F1A400; --ink:#1f2937; --muted:#627083; --surface:#fff; --line:#d9e4eb; }
* { box-sizing:border-box; }
body { min-height:100vh; margin:0; color:var(--ink); background:#f2f7fa; font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif; }
.shell { min-height:100vh; display:grid; place-items:center; padding:28px 18px; }
.login { width:min(100%,470px); overflow:hidden; background:var(--surface); border-radius:16px; box-shadow:0 20px 54px rgba(18,61,89,.16); }
.brand { display:flex; align-items:center; gap:16px; min-height:132px; padding:26px 30px; color:#fff; background:var(--blue); }
.logo-wrap { display:inline-flex; align-items:center; padding:5px 8px; background:#fff; border-radius:9px; }
.logo-wrap img { display:block; width:76px; height:auto; }
.brand-copy { display:grid; gap:5px; }
.brand p { margin:0; font-size:.78rem; font-weight:700; letter-spacing:.08em; }
.brand h1 { margin:0; font-size:1.8rem; letter-spacing:-.025em; }
.body { padding:30px; }
.body h2 { margin:0 0 10px; font-size:1.35rem; }
.lead, .destination, .hint { color:var(--muted); font-size:.9rem; line-height:1.65; }
.lead { margin:0; }.destination { margin:18px 0 0; padding-top:16px; border-top:1px solid var(--line); }
form { display:grid; gap:12px; margin-top:24px; }
label { display:grid; gap:7px; font-weight:700; font-size:.88rem; }
input { width:100%; min-height:48px; padding:11px 12px; color:var(--ink); background:#fff; border:1px solid #b9cbd6; border-radius:9px; font:inherit; }
input:focus { outline:3px solid rgba(0,147,221,.2); border-color:var(--blue); }
button { min-height:48px; color:#fff; background:var(--blue); border:0; border-radius:9px; font:inherit; font-weight:750; cursor:pointer; }
button:hover { background:#007fbe; } button:disabled { opacity:.65; cursor:wait; }
#message { min-height:1.4em; margin:17px 0 0; color:var(--muted); font-size:.86rem; line-height:1.6; }
#message[data-type="success"] { color:#167548; } #message[data-type="error"] { color:#b42318; }
.hint { margin:20px 0 0; font-size:.78rem; }
@media (max-width:480px) { .shell { padding:0; align-items:stretch; }.login { width:100%; min-height:100vh; border-radius:0; }.brand { min-height:116px; padding:22px; }.logo-wrap img { width:64px; }.brand h1 { font-size:1.55rem; }.body { padding:28px 22px; } }