:root{--ink:#173b40;--muted:#798a8d;--paper:#f8fbfb;--line:#e0eaea;--forest:#176a6c;--forest-dark:#105052;--surface:#fff}
.field-error{display:block;font-size:12px;line-height:1.5;color:#ab4938;padding-left:2px;margin:-10px 0 12px;animation:notice-slide-in .2s ease}
input[aria-invalid="true"]:focus-visible{outline-color:#deb3a9}
input[aria-invalid="true"]{border-color:#cd877a;background:#fffafa}
.login-notice{font-size:13px;line-height:1.6;padding:11px 14px;border-radius:10px;border:1px solid #eedad5;background:#fcf5f3;color:#8e4c3e;margin:16px 0 0;animation:notice-slide-in .25s cubic-bezier(.16,1,.3,1)}
.login-notice[data-kind="success"]{color:#176a6c;background:#eff7f5;border-color:#d2e7e1}
#submit.is-loading::before{content:"";display:inline-block;width:14px;height:14px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;margin-right:9px;vertical-align:-2px;animation:login-spin .8s linear infinite}
@keyframes login-spin{to{transform:rotate(360deg)}}
@keyframes login-card-enter{from{opacity:0;transform:translateY(16px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}
@keyframes notice-slide-in{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}
@media(prefers-reduced-motion:reduce){#submit.is-loading::before,main,.login-notice{animation:none}}
#message:empty{min-height:0;margin:20px 0 0}
*{box-sizing:border-box}
body{margin:0;background:radial-gradient(circle at 18% 22%,rgba(42,122,133,.12) 0%,transparent 50%),radial-gradient(circle at 82% 78%,rgba(46,139,106,.1) 0%,transparent 55%),var(--paper);color:var(--ink);font:14px/1.6 "Microsoft YaHei UI","Microsoft YaHei","Segoe UI",sans-serif;min-height:100vh;display:grid;place-items:center;padding:24px;-webkit-font-smoothing:antialiased}
main{width:min(480px,100%);background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:42px 40px;box-shadow:0 24px 70px rgba(23,106,108,.1),0 2px 6px rgba(23,106,108,.04);animation:login-card-enter .5s cubic-bezier(.16,1,.3,1)}
header{text-align:center}
header img{width:76px;height:76px;object-fit:contain;background:var(--paper);border-radius:18px;padding:8px;box-shadow:0 4px 12px rgba(23,106,108,.06);transition:transform .3s cubic-bezier(.16,1,.3,1),box-shadow .3s ease}
header img:hover{transform:translateY(-3px) scale(1.04);box-shadow:0 8px 20px rgba(23,106,108,.12)}
h1{font-size:30px;letter-spacing:-1px;margin:18px 0 4px;color:var(--ink)}
p,footer{color:var(--muted)}
nav{display:flex;flex-direction:column;gap:12px;margin:38px 0 0}
button,input{font:inherit;border-radius:10px;border:1px solid var(--line);padding:12px 16px;transition:border-color .2s cubic-bezier(.16,1,.3,1),box-shadow .2s cubic-bezier(.16,1,.3,1),transform .12s cubic-bezier(.16,1,.3,1),background .2s ease}
button{cursor:pointer;background:var(--surface);color:var(--forest);min-height:48px}
button:hover{background:#eff7f5;border-color:#77a5a4;transform:translateY(-1px)}
button:active{transform:translateY(1px) scale(.98)}
nav .primary{margin:0}
button span{float:right}
label{display:grid;gap:6px;margin:16px 0;color:var(--ink)}
input{background:var(--surface);color:var(--ink);width:100%}
input:focus{border-color:var(--forest);box-shadow:0 0 0 3px rgba(23,106,108,.16)}
input:focus-visible,button:focus-visible{outline:2px solid #77b9b5;outline-offset:3px}
.primary{width:100%;background:linear-gradient(135deg,#1c7c7e 0%,var(--forest) 100%);color:white;border:0;margin-top:16px;font-weight:600;box-shadow:0 4px 14px rgba(23,106,108,.24)}
.primary:hover{background:linear-gradient(135deg,#156365 0%,var(--forest-dark) 100%);box-shadow:0 8px 22px rgba(23,106,108,.32);transform:translateY(-1.5px)}
.primary:active{transform:translateY(1px) scale(.98);box-shadow:0 2px 6px rgba(23,106,108,.2)}
button:disabled{opacity:.5;cursor:wait;transform:none}
footer{font-size:12px;text-align:center}
.diagnostics-link{display:block;margin:8px auto;padding:4px 10px;min-height:32px;border-color:transparent;background:transparent;color:var(--muted);font-size:12px;text-decoration:underline;text-underline-offset:3px}
#message{min-height:18px;color:#a45039;margin:16px 0 8px}
#back-modes{border:0;padding:0;min-height:36px;color:var(--forest);margin-top:20px}
[hidden]{display:none!important}
@media(max-width:780px){main{padding:30px 24px}h1{font-size:26px}}
.login-alternative{margin-top:16px;text-align:center}
.login-alternative button{width:100%;background:transparent;border-color:var(--line);color:var(--muted)}
.login-alternative button:hover{background:rgba(23,106,108,.05);border-color:#77a5a4;color:var(--forest)}