:root { color-scheme: light; --ink: #273e50; --copper: #ad7138; --muted: #647580; }
* { box-sizing: border-box; }
body { min-height: 100vh; min-height: 100svh; margin: 0; display: grid; place-items: center; padding: 48px 24px; background: #eef1ef; color: var(--ink); font-family: "Microsoft JhengHei", "PingFang TC", sans-serif; }
.login-panel { width: 100%; max-width: 420px; padding: 40px 36px 30px; background: #fff; border: 1px solid #d7dedb; border-top: 4px solid var(--copper); box-shadow: 0 18px 50px #273e5010; }
.brand { display: flex; align-items: center; gap: 12px; font-size: 22px; font-weight: 700; letter-spacing: .01em; }
.brand-mark { display: grid; place-items: center; width: 44px; height: 44px; background: var(--ink); color: white; font-family: Georgia, serif; font-size: 30px; border-radius: 2px; }
.brand-subtitle { display: block; font-size: 9px; letter-spacing: .2em; margin-top: 2px; color: var(--muted); }
.login-heading { margin: 38px 0 28px; }
.eyebrow { font-size: 11px; letter-spacing: .15em; color: var(--copper); font-weight: 700; }
h1 { font-size: 25px; margin: 8px 0 12px; letter-spacing: .01em; }
.login-heading p { font-size: 13px; line-height: 1.8; margin: 0; color: var(--muted); }
label { display: block; font-size: 13px; margin: 20px 0 8px; font-weight: 600; }
input { width: 100%; padding: 12px 13px; border: 1px solid #b9c7c4; border-radius: 3px; background: #fbfcfb; font: inherit; font-size: 15px; color: var(--ink); }
input:focus-visible, button:focus-visible { outline: 2px solid var(--copper); outline-offset: 3px; }
#login-feedback { min-height: 36px; line-height: 1.6; font-size: 12px; margin: 12px 0 10px; color: var(--muted); }
#login-feedback.error { color: #a32c24; }
button { width: 100%; display: flex; justify-content: space-between; align-items: center; padding: 13px 16px; border: 0; border-radius: 3px; background: var(--ink); color: white; font: inherit; font-size: 14px; font-weight: 600; cursor: pointer; }
button:hover { background: #36556b; }
button:disabled { opacity: .65; cursor: wait; }
.login-note { border-top: 1px solid #e2e8e4; padding-top: 20px; margin: 28px 0 0; font-size: 11px; line-height: 1.8; color: var(--muted); }
@media (max-width: 480px) { body { padding: 24px; } .login-panel { padding: 30px 24px 24px; } .login-heading { margin-top: 30px; } h1 { font-size: 23px; } }