:root { --brand: #1f6feb; --brand-dark: #1557c0; --text: #1f2328; --muted: #6e7781; --line: #d0d7de; --bg: #f5f7fb; --danger: #cf222e; }
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif; color: var(--text); background: var(--bg); }
.page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px 16px; }
.card { width: 100%; max-width: 400px; background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 32px 28px; box-shadow: 0 8px 24px rgba(140, 149, 159, .15); }
.brand { font-size: 20px; font-weight: 600; color: var(--brand); margin: 0 0 4px; }
.sub { color: var(--muted); font-size: 14px; margin: 0 0 24px; }
label { display: block; font-size: 14px; margin: 16px 0 6px; }
input[type=text], input[type=password] { width: 100%; height: 40px; border: 1px solid var(--line); border-radius: 6px; padding: 0 12px; font-size: 15px; }
input:focus { outline: 2px solid rgba(31, 111, 235, .3); border-color: var(--brand); }
button, .btn { display: inline-block; width: 100%; height: 42px; margin-top: 24px; border: 0; border-radius: 6px; background: var(--brand); color: #fff; font-size: 15px; cursor: pointer; text-align: center; line-height: 42px; text-decoration: none; }
button:hover, .btn:hover { background: var(--brand-dark); }
.btn-plain { background: #fff; color: var(--text); border: 1px solid var(--line); }
.btn-plain:hover { background: #f6f8fa; }
.msg { border-radius: 6px; padding: 10px 12px; font-size: 14px; margin-bottom: 8px; }
.msg-error { background: #ffebe9; color: var(--danger); }
.msg-info { background: #ddf4ff; color: #0969da; }
.tenants { list-style: none; padding: 0; margin: 0; }
.tenants li { margin-top: 10px; }
.tenants button { margin-top: 0; text-align: left; padding: 0 14px; background: #fff; color: var(--text); border: 1px solid var(--line); }
.tenants button:hover, .tenants .current button { border-color: var(--brand); background: #f0f6ff; }
.tag { font-size: 12px; color: var(--muted); margin-left: 6px; }
.row { display: flex; justify-content: space-between; font-size: 14px; padding: 8px 0; border-bottom: 1px solid #eaeef2; }
.row span:first-child { color: var(--muted); }
.foot { margin-top: 20px; font-size: 12px; color: var(--muted); text-align: center; }