:root{color-scheme:dark;font-family:Inter,"Segoe UI","Microsoft YaHei",system-ui,sans-serif;--bg:#0b0f15;--panel:#111822;--line:#273242;--text:#f3f7fb;--muted:#8b9aaf;--cyan:#6ee7ff;--red:#ff7083}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:radial-gradient(circle at 75% 0,rgba(110,231,255,.1),transparent 32%),radial-gradient(circle at 10% 95%,rgba(155,130,255,.1),transparent 28%),var(--bg);color:var(--text)}.login-shell{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card{width:min(430px,100%);padding:38px;border:1px solid var(--line);border-radius:18px;background:rgba(17,24,34,.94);box-shadow:0 30px 100px rgba(0,0,0,.48)}.brand{display:flex;align-items:center;gap:10px;margin-bottom:38px}.brand>span{width:34px;height:34px;display:grid;place-items:center;border-radius:9px;background:linear-gradient(135deg,var(--cyan),#b5f5ff);color:#071016;font-weight:900}.brand strong{font-size:1rem}.eyebrow{margin:0 0 8px;color:var(--cyan);font-size:.75rem;font-weight:850;letter-spacing:.15em;text-transform:uppercase}h1{margin:0;font-size:2rem;letter-spacing:-.04em}.intro{margin:10px 0 26px;color:var(--muted);font-size:.92rem;line-height:1.6}form{display:grid;gap:16px}label{display:grid;gap:8px}label>span{font-size:.82rem;font-weight:700;color:#c5cfda}input{width:100%;height:46px;border:1px solid var(--line);border-radius:10px;padding:0 13px;background:#0d131b;color:var(--text);font:inherit;outline:0}input:focus{border-color:#4d9aac;box-shadow:0 0 0 3px rgba(110,231,255,.08)}button{height:46px;border:0;border-radius:10px;margin-top:4px;background:var(--cyan);color:#071016;font:inherit;font-weight:800;cursor:pointer}button:hover{filter:brightness(1.04)}.login-error{margin:-8px 0 17px;padding:10px 12px;border-left:2px solid var(--red);background:rgba(255,112,131,.08);color:#ffc1ca;font-size:.8rem;line-height:1.5}.login-card>small{display:block;margin-top:20px;color:#66758a;font-size:.72rem;text-align:center}@media(max-width:480px){.login-card{padding:28px 22px}.brand{margin-bottom:30px}}