:root { color-scheme: light dark; --paper: #f3efe7; --ink: #16181b; --muted: #80848a; --hair: #d7d0c4; --seal: #b13a2a; --navy: #22385f; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 32px 20px; background: var(--paper); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif; }
main { width: min(420px, 100%); border-top: 4px solid var(--seal); padding: 32px 0; }
h1 { font: 600 27px/1.5 'Songti SC', SimSun, serif; margin: 0 0 8px; letter-spacing: .04em; }
p { margin: 0 0 28px; color: var(--muted); font-size: 14px; line-height: 1.8; }
label { display: block; margin-top: 22px; font-size: 14px; }
input { width: 100%; margin-top: 9px; padding: 13px 14px; border: 1px solid var(--hair); border-radius: 4px; background: transparent; color: inherit; font: inherit; }
button { width: 100%; margin-top: 30px; padding: 14px; border: 1px solid var(--navy); border-radius: 4px; background: var(--navy); color: white; font-family: inherit; font-size: 14px; font-weight: 600; line-height: 1.4; cursor: pointer; }
button:hover { filter: brightness(1.1); }
:focus-visible { outline: 2px solid var(--seal); outline-offset: 3px; }
.error { border-left: 2px solid var(--seal); padding-left: 12px; color: var(--seal); }
@media (prefers-color-scheme: dark) { :root { --paper: #0f1113; --ink: #ece7de; --muted: #b8b2a8; --hair: #33373d; --seal: #e2654f; --navy: #9fb5e6; } button { color: #0f1113; } }