:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --border: #e2e5ea;
  --text: #1a2233;
  --text-muted: #5c6577;
  --primary: #2454ff;
  --primary-dark: #1a3fcc;
  --success: #1a8f5e;
  --success-bg: #e6f6ee;
  --warning: #a5690a;
  --warning-bg: #fdf1dd;
  --danger: #c62a2a;
  --danger-bg: #fceaea;
  --muted-bg: #eef0f4;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(20, 25, 40, 0.06), 0 1px 8px rgba(20, 25, 40, 0.04);
  color-scheme: light dark;
}

:root[data-theme="dark"] {
  --bg: #12151c;
  --surface: #1b1f2a;
  --border: #2a2f3d;
  --text: #e8eaf0;
  --text-muted: #9aa1b2;
  --primary: #5b8cff;
  --primary-dark: #82a5ff;
  --success: #3ecf8e;
  --success-bg: rgba(62, 207, 142, 0.14);
  --warning: #e0a53c;
  --warning-bg: rgba(224, 165, 60, 0.14);
  --danger: #ef5a5a;
  --danger-bg: rgba(239, 90, 90, 0.14);
  --muted-bg: #232838;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 1px 8px rgba(0, 0, 0, 0.3);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) {
    --bg: #12151c;
    --surface: #1b1f2a;
    --border: #2a2f3d;
    --text: #e8eaf0;
    --text-muted: #9aa1b2;
    --primary: #5b8cff;
    --primary-dark: #82a5ff;
    --success: #3ecf8e;
    --success-bg: rgba(62, 207, 142, 0.14);
    --warning: #e0a53c;
    --warning-bg: rgba(224, 165, 60, 0.14);
    --danger: #ef5a5a;
    --danger-bg: rgba(239, 90, 90, 0.14);
    --muted-bg: #232838;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 1px 8px rgba(0, 0, 0, 0.3);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  transition: background-color 0.15s ease, color 0.15s ease;
}

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

.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
}
.brand:hover { text-decoration: none; }

.topnav { display: flex; align-items: center; gap: 20px; }
.topnav a { color: var(--text-muted); font-weight: 500; font-size: 0.95rem; }
.topnav a:hover { color: var(--text); text-decoration: none; }
.topnav-user { color: var(--text-muted); font-size: 0.9rem; padding-left: 4px; border-left: 1px solid var(--border); padding-left: 12px; }
.topnav .cta {
  background: var(--primary);
  color: #fff;
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 600;
}
.topnav .cta:hover { background: var(--primary-dark); text-decoration: none; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  flex: none;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
}
.theme-toggle:hover { color: var(--text); background: var(--muted-bg); }
.theme-toggle svg { width: 17px; height: 17px; display: block; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

.footer { border-top: 1px solid var(--border); margin-top: 48px; }
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.flash {
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  font-size: 0.95rem;
}
.flash-success { background: var(--success-bg); color: var(--success); }
.flash-error { background: var(--danger-bg); color: var(--danger); }

.hero {
  text-align: center;
  padding: 64px 0 40px;
}
.hero h1 { font-size: 2.6rem; margin-bottom: 12px; }
.hero p.lead { font-size: 1.2rem; color: var(--text-muted); max-width: 640px; margin: 0 auto 28px; }
.hero-ctas { display: flex; gap: 12px; justify-content: center; }

.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 12px 22px;
  border-radius: 8px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}
.btn:hover { background: var(--primary-dark); text-decoration: none; }
.btn-secondary { background: var(--surface); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--muted-bg); }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #a02121; }
.btn-small { padding: 6px 12px; font-size: 0.85rem; border-radius: 6px; }

.link-button {
  background: none;
  border: none;
  color: var(--text-muted);
  font: inherit;
  cursor: pointer;
  padding: 0;
}
.link-button:hover { color: var(--text); text-decoration: underline; }
.inline-form { display: inline; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin: 48px 0; }
.step { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.step .num { display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 50%; background: var(--primary); color: #fff; font-weight: 700; margin-bottom: 12px; }
.step h3 { margin: 0 0 8px; }
.step p { color: var(--text-muted); margin: 0; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}

.card h2 { margin-top: 0; }

.summary-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 32px; }
.summary-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.summary-card .value { font-size: 2rem; font-weight: 700; }
.summary-card .label { color: var(--text-muted); font-size: 0.9rem; }
.summary-card.warn .value { color: var(--warning); }
.summary-card.danger .value { color: var(--danger); }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 0.95rem; }
th { color: var(--text-muted); font-weight: 600; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.03em; }
tr:last-child td { border-bottom: none; }

.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 0.78rem; font-weight: 600; }
.badge-valid, .badge-active, .badge-online { background: var(--success-bg); color: var(--success); }
.badge-expiring_soon, .badge-pending { background: var(--warning-bg); color: var(--warning); }
.badge-expired, .badge-suspended, .badge-disabled { background: var(--danger-bg); color: var(--danger); }
.badge-never_checked_in, .badge-offline { background: var(--muted-bg); color: var(--text-muted); }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 0.9rem; }
.form-group input[type=text],
.form-group input[type=email],
.form-group input[type=password],
.form-group select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
}
.form-group .hint { color: var(--text-muted); font-size: 0.82rem; margin-top: 4px; }
.form-row { display: flex; gap: 16px; }
.form-row .form-group { flex: 1; }

.errors { background: var(--danger-bg); color: var(--danger); padding: 12px 16px; border-radius: var(--radius); margin-bottom: 20px; }
.errors ul { margin: 0; padding-left: 18px; }

.tabs { display: flex; gap: 8px; margin-bottom: 24px; border-bottom: 1px solid var(--border); }
.tabs a { padding: 10px 4px; color: var(--text-muted); font-weight: 600; border-bottom: 2px solid transparent; }
.tabs a.active { color: var(--primary); border-bottom-color: var(--primary); }

.token-box {
  background: var(--muted-bg);
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9rem;
  word-break: break-all;
}

.empty-state { text-align: center; padding: 40px 20px; color: var(--text-muted); }

.faq-section { margin-bottom: 32px; }
.faq-section h2 { border-bottom: 1px solid var(--border); padding-bottom: 8px; }
details.faq-item { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 12px 16px; margin-bottom: 10px; }
details.faq-item summary { font-weight: 600; cursor: pointer; }
details.faq-item[open] summary { margin-bottom: 8px; }
.stub-note { display: inline-block; background: var(--warning-bg); color: var(--warning); padding: 2px 10px; border-radius: 999px; font-size: 0.78rem; font-weight: 600; margin-left: 8px; }

.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }

.muted { color: var(--text-muted); }

@media (max-width: 640px) {
  .steps { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; }
  .topbar-inner { flex-direction: column; gap: 10px; align-items: flex-start; }
}