/* Giao diện tối giản cho trang đăng nhập/tài khoản/quản trị. Không font hay script bên ngoài (CSP 'self'). */
:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --primary: #2453d6;
  --primary-text: #ffffff;
  --danger: #b42318;
  --danger-bg: #fef3f2;
  --success: #067647;
  --success-bg: #ecfdf3;
  --radius: 10px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --surface: #171a21;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #2a2f3a;
    --primary: #6d8cf5;
    --primary-text: #0f1115;
    --danger: #fda29b;
    --danger-bg: #2d1414;
    --success: #75e0a7;
    --success-bg: #0f2a1d;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px;
}

.brand { font-weight: 700; letter-spacing: .2px; color: var(--text); }
.langs a { margin-left: 12px; color: var(--muted); font-size: 13px; }
.langs a.active { color: var(--text); font-weight: 600; }

.center { display: flex; justify-content: center; padding: 24px 16px 64px; }
.wide { max-width: 1080px; margin: 0 auto; padding: 8px 16px 64px; }

.card {
  width: 100%;
  max-width: 400px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}
.card.lg { max-width: 560px; }

h1 { font-size: 22px; margin: 0 0 6px; }
h2 { font-size: 17px; margin: 24px 0 8px; }
.sub { color: var(--muted); margin: 0 0 20px; }

label { display: block; font-weight: 500; margin: 14px 0 6px; }
input[type=text], input[type=email], input[type=password], input[type=url], select, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: 1px; }
textarea { min-height: 72px; }
.hint { color: var(--muted); font-size: 13px; margin-top: 4px; }
.checkbox { display: flex; gap: 8px; align-items: center; margin-top: 12px; font-weight: 400; }

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.btn:hover { text-decoration: none; filter: brightness(.97); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); }
.btn.danger { color: var(--danger); }
.btn.block { width: 100%; margin-top: 20px; }
.btn.sm { padding: 6px 10px; font-size: 13px; }

.alert { padding: 10px 12px; border-radius: 8px; margin: 0 0 16px; font-size: 14px; }
.alert.error { background: var(--danger-bg); color: var(--danger); }
.alert.success { background: var(--success-bg); color: var(--success); }

.divider { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 13px; margin: 20px 0 4px; }
.divider::before, .divider::after { content: ""; flex: 1; border-top: 1px solid var(--border); }
.social .btn { width: 100%; margin-top: 10px; }

.links { display: flex; justify-content: space-between; margin-top: 16px; font-size: 14px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.muted { color: var(--muted); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

table { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 14px; vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 13px; }
tr:last-child td { border-bottom: 0; }
.table-wrap { overflow-x: auto; }

.badge { display: inline-block; padding: 1px 8px; border-radius: 999px; border: 1px solid var(--border); font-size: 12px; color: var(--muted); }
.badge.on { color: var(--success); border-color: currentColor; }
.badge.off { color: var(--danger); border-color: currentColor; }

.nav { display: flex; gap: 16px; margin: 0 0 20px; border-bottom: 1px solid var(--border); }
.nav a { padding: 10px 2px; color: var(--muted); }
.nav a.active { color: var(--text); border-bottom: 2px solid var(--primary); }

.codes { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px 16px; margin: 12px 0; }
.qr { display: flex; justify-content: center; margin: 12px 0; }
.qr svg { width: 200px; height: 200px; background: #fff; padding: 8px; border-radius: 8px; }

@media (max-width: 480px) {
  .card { padding: 20px; border-radius: 0; border-left: 0; border-right: 0; }
  .center { padding: 8px 0 48px; }
}

/* Nút passkey hiện bằng JS khi trình duyệt hỗ trợ */
[hidden] { display: none !important; }