:root {
  --bg: #101416; --panel: #191f22; --line: #2a3235; --muted: #a4b1b3;
  --text: #f1f5f2; --lime: #c0ed8a;
  --font: "Segoe UI", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--text); font: 16px var(--font); }
.login-shell { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: radial-gradient(circle at 20% 0%, #1c2a22 0, var(--bg) 48%); }
.login-card { width: min(430px, 100%); background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 34px 32px 28px; box-shadow: 0 24px 80px #0006; }
.login-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 28px; }
.login-mark { width: 44px; height: 44px; display: block; border-radius: 12px; background: #0c1813 url("/brand-mark.svg") center/cover no-repeat; color: transparent; font-size: 0; overflow: hidden; box-shadow: 0 0 0 1px rgba(192,237,138,.12), 0 8px 22px rgba(0,0,0,.22); }
.login-brand strong { display: block; font-size: 22px; letter-spacing: 3px; }
.login-brand small { display: block; color: var(--muted); font-size: 9px; letter-spacing: 1.2px; margin-top: 4px; }
.eyebrow { color: var(--muted); font-size: 11px; letter-spacing: 2px; }
h1 { font-size: 32px; margin: 8px 0 10px; font-weight: 600; letter-spacing: 1px; }
.login-note, .login-foot { color: var(--muted); font-size: 13px; line-height: 1.7; }
.login-note { min-height: 22px; margin: 0 0 22px; }
label { display: block; margin-bottom: 16px; }
label span { display: block; color: var(--muted); font-size: 13px; margin-bottom: 8px; }
input { width: 100%; min-height: 46px; padding: 11px 12px; border-radius: 6px; border: 1px solid #43513e; background: #12181a; color: var(--text); font: 15px var(--font); }
input:focus-visible { outline: 2px solid var(--lime); outline-offset: 1px; }
.login-button { width: 100%; min-height: 48px; border: 0; border-radius: 6px; background: var(--lime); color: #17231e; font: 600 15px var(--font); cursor: pointer; margin-top: 4px; }
.login-button:disabled { opacity: .5; cursor: wait; }
.login-button:hover:not(:disabled) { background: #d1f4a8; }
.login-error { margin: 14px 0 0; padding: 10px 12px; border: 1px solid #8c5659; border-radius: 5px; background: #4c2b2f; color: #ffb1b5; font-size: 13px; line-height: 1.6; }
.login-foot { border-top: 1px solid var(--line); margin: 24px 0 0; padding-top: 16px; font-size: 12px; }
@media (max-width: 520px) { .login-card { padding: 26px 22px 22px; } h1 { font-size: 28px; } }