:root { color-scheme: light; font-family: Inter, "Microsoft YaHei", sans-serif; background: #f3f7fc; color: #14243b; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: radial-gradient(circle at 20% 10%, #e8f2ff, transparent 36%), #f5f8fc; }
.login-shell { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-card { width: min(430px, 100%); padding: 38px; border: 1px solid #d8e3f0; border-radius: 24px; background: rgba(255,255,255,.96); box-shadow: 0 24px 70px rgba(40,77,124,.13); }
.login-card img { display: block; border-radius: 16px; box-shadow: 0 8px 22px rgba(30,107,222,.18); }
.eyebrow { margin: 22px 0 6px; color: #1769e8; font-size: 11px; font-weight: 800; letter-spacing: .12em; }
h1 { margin: 0; font-size: 28px; letter-spacing: -.03em; }
.intro { margin: 12px 0 26px; color: #64768d; font-size: 14px; line-height: 1.7; }
label { display: block; margin-bottom: 8px; font-size: 13px; font-weight: 800; }
input { width: 100%; height: 48px; padding: 0 14px; border: 1px solid #cdd9e8; border-radius: 11px; outline: 0; font: inherit; }
input:focus { border-color: #2b79ed; box-shadow: 0 0 0 4px rgba(43,121,237,.12); }
button { width: 100%; height: 48px; margin-top: 14px; border: 0; border-radius: 11px; color: white; background: #1769e8; font-size: 15px; font-weight: 800; cursor: pointer; }
button:disabled { opacity: .6; cursor: wait; }
.error { min-height: 22px; margin: 14px 0 0; color: #c83b3b; font-size: 13px; }
@media (max-width: 520px) { .login-card { padding: 28px 22px; border-radius: 18px; } }