:root { --bg: #f4f6f9; --card: #ffffff; --text: #1d2733; --muted: #5b6776; --primary: #1f4e79; --primary-hover: #173b5c; --line: #d6dce4; --error: #b42318; --ok: #1b5e20; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 16px; background: var(--bg); color: var(--text); font: 16px/1.6 "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif; }
.card { width: 100%; max-width: 420px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 32px 28px; }
h1 { font-size: 24px; margin: 0 0 4px; }
h2 { font-size: 19px; margin: 0 0 8px; }
.sub, .muted, .foot { color: var(--muted); }
.sub { margin: 0 0 24px; }
.foot { font-size: 13px; margin: 24px 0 0; border-top: 1px solid var(--line); padding-top: 16px; }
label { display: block; font-size: 14px; margin: 12px 0 4px; }
input { width: 100%; font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; }
input:focus { outline: 2px solid var(--primary); outline-offset: 1px; }
button { font: inherit; cursor: pointer; }
.primary, .secondary { display: block; width: 100%; min-height: 48px; border-radius: 8px; font-weight: 600; }
.primary { background: var(--primary); color: #fff; border: 0; }
.primary:hover { background: var(--primary-hover); }
.secondary { margin-top: 16px; background: #fff; color: var(--primary); border: 1px solid var(--primary); }
.link { background: none; border: 0; color: var(--primary); padding: 8px 0; text-decoration: underline; }
.links { display: flex; justify-content: space-between; gap: 12px; margin-top: 12px; flex-wrap: wrap; }
.divider { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 14px; margin: 20px 0 4px; }
.divider::before, .divider::after { content: ""; flex: 1; border-top: 1px solid var(--line); }
.notice { margin: 0 0 16px; padding: 10px 12px; border-radius: 8px; background: #e8f3ea; color: var(--ok); }
.notice.error { background: #fdecea; color: var(--error); }
.progress { height: 3px; margin: -8px 0 16px; background: linear-gradient(90deg, var(--primary) 30%, transparent 30%) 0 0 / 200% 100%; animation: slide 1s linear infinite; }
@keyframes slide { to { background-position: -200% 0; } }
.primary-link { color: var(--primary); font-weight: 600; }