:root { color-scheme: light; font-family: "Microsoft YaHei", Arial, sans-serif; color: #171717; background: #f4f4f2; }
* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; }
.login-page { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: linear-gradient(135deg, #f6c945 0 18%, #f4f4f2 18% 100%); }
.login-panel { width: min(100%, 420px); background: #fff; border: 1px solid #d8d8d3; border-radius: 8px; padding: 32px; box-shadow: 0 20px 56px rgba(20, 20, 18, .12); }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
.brand-mark { width: 46px; height: 46px; display: grid; place-items: center; flex: 0 0 auto; background: #171717; color: #f6c945; border-radius: 8px; font-size: 22px; font-weight: 800; }
header h1 { margin: 0; font-size: 24px; letter-spacing: 0; }
form { display: grid; gap: 10px; }
label { margin-top: 8px; font-size: 14px; font-weight: 600; }
input { width: 100%; min-height: 46px; border: 1px solid #bdbdb7; border-radius: 6px; padding: 10px 12px; font: inherit; }
input:focus { outline: 3px solid rgba(246, 201, 69, .35); border-color: #171717; }
button { min-height: 46px; margin-top: 14px; border: 0; border-radius: 6px; background: #171717; color: #fff; font: inherit; font-weight: 700; cursor: pointer; }
button:disabled { opacity: .65; cursor: wait; }
.message { min-height: 22px; margin: 4px 0 0; color: #b42318; font-size: 14px; }
.message.success { color: #166534; }
@media (max-width: 480px) { .login-page { padding: 16px; } .login-panel { padding: 24px 20px; } }