:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-hover: #22252f;
  --border: #2a2d3a;
  --text: #e4e6ed;
  --text-muted: #8b8fa3;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --green: #22c55e;
  --red: #ef4444;
  --yellow: #eab308;
  --radius: 8px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --mono: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 220px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 24px 0;
  flex-shrink: 0;
}

.sidebar-brand {
  padding: 0 20px 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}

.sidebar-brand h2 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.sidebar-brand span {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sidebar nav a {
  display: block;
  padding: 10px 20px;
  color: var(--text-muted);
  font-size: 14px;
  transition: all 0.15s;
}

.sidebar nav a:hover {
  color: var(--text);
  background: var(--surface-hover);
}

.sidebar nav a.active {
  color: var(--accent);
  background: rgba(99, 102, 241, 0.1);
  border-right: 2px solid var(--accent);
}

.main {
  flex: 1;
  padding: 32px;
  overflow-x: auto;
}

.main h1 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 24px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.stat-card .label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.stat-card .value {
  font-size: 28px;
  font-weight: 600;
}

.stat-green .value { color: var(--green); }
.stat-yellow .value { color: var(--yellow); }
.stat-red .value { color: var(--red); }

.stats-4 {
  grid-template-columns: repeat(4, 1fr);
}

.stats-section {
  margin-bottom: 24px;
}

.stats-section .stats {
  margin-bottom: 0;
}

.stats-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
  font-weight: 500;
}

.tab-nav {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.tab-nav a {
  padding: 10px 20px;
  font-size: 14px;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all 0.15s;
}

.tab-nav a:hover {
  color: var(--text);
}

.tab-nav a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.pagination {
  display: flex;
  gap: 8px;
  justify-content: center;
  padding: 16px;
}

.pagination a,
.pagination span {
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
}

.pagination a {
  background: var(--surface-hover);
  color: var(--text);
}

.pagination a:hover {
  background: var(--accent);
  color: #fff;
}

.pagination span.current {
  background: var(--accent);
  color: #fff;
}

.billing-placeholder {
  padding: 32px;
  text-align: center;
  color: var(--text-muted);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  margin-top: 16px;
}

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

.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-header h2 {
  font-size: 16px;
  font-weight: 600;
}

.card-body {
  padding: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

thead th {
  text-align: left;
  padding: 12px 16px;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
}

tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background: var(--surface-hover);
}

.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.badge-active { background: rgba(34,197,94,0.15); color: var(--green); }
.badge-expired { background: rgba(234,179,8,0.15); color: var(--yellow); }
.badge-revoked { background: rgba(239,68,68,0.15); color: var(--red); }
.badge-validation { background: rgba(99,102,241,0.15); color: var(--accent); }
.badge-heartbeat { background: rgba(34,197,94,0.15); color: var(--green); }
.badge-validation_failed { background: rgba(239,68,68,0.15); color: var(--red); }

.mono {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-muted);
}

.btn {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); color: #fff; }

.btn-danger {
  background: rgba(239,68,68,0.15);
  color: var(--red);
}
.btn-danger:hover { background: rgba(239,68,68,0.25); }

.btn-sm {
  padding: 4px 12px;
  font-size: 12px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 14px;
  font-family: var(--font);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
}

.form-inline {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: flex-end;
}

.form-inline .form-group {
  flex: 1;
  min-width: 180px;
}

.form-actions {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 8px;
}

.detail-grid {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 0;
  padding: 20px;
}

.detail-grid dt {
  padding: 8px 0;
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

.detail-grid dd {
  padding: 8px 0;
  font-size: 13px;
}

.empty {
  padding: 32px;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
}

.alert {
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 16px;
  font-size: 13px;
}

.alert-success {
  background: rgba(34,197,94,0.1);
  border: 1px solid rgba(34,197,94,0.3);
  color: var(--green);
}

.alert-error {
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.3);
  color: var(--red);
}

.filter-input {
  padding: 8px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 13px;
  font-family: var(--font);
  width: 240px;
}

.filter-input:focus {
  outline: none;
  border-color: var(--accent);
}

/* Usage History monthly accordion */
.usage-month-header {
  display: grid;
  grid-template-columns: 32px 1fr repeat(5, 100px);
  padding: 12px 16px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
}

.usage-month {
  border-bottom: 1px solid var(--border);
}

.usage-month:last-of-type {
  border-bottom: none;
}

.usage-month-row {
  display: grid;
  grid-template-columns: 32px 1fr repeat(5, 100px);
  padding: 12px 16px;
  font-size: 13px;
  cursor: pointer;
  list-style: none;
  transition: background 0.15s;
}

.usage-month-row:hover {
  background: var(--surface-hover);
}

.usage-month-row::-webkit-details-marker {
  display: none;
}

.usage-month-col-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
}

.usage-chevron {
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 5px solid var(--text-muted);
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  transition: transform 0.15s;
}

details[open] > .usage-month-row .usage-chevron {
  transform: rotate(90deg);
}

.usage-month-col-period {
  display: flex;
  align-items: center;
  font-weight: 500;
}

.usage-month-col {
  display: flex;
  align-items: center;
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 12px;
}

.usage-month-header .usage-month-col,
.usage-month-header .usage-month-col-period {
  font-family: var(--font);
}

.usage-month-detail {
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.usage-month-detail table {
  font-size: 12px;
}

.usage-month-detail thead th {
  font-size: 11px;
  padding: 8px 16px;
}

.usage-month-detail tbody td {
  padding: 8px 16px;
}

/* Login page */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--bg);
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  width: 100%;
  max-width: 400px;
}

.login-brand {
  text-align: center;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.login-brand h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.login-brand span {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-block {
  display: block;
  width: 100%;
  text-align: center;
  padding: 10px 16px;
  margin-top: 8px;
}

/* Sidebar footer with logout */
.sidebar-footer {
  margin-top: auto;
  padding: 16px 20px;
  border-top: 1px solid var(--border);
}

.sidebar {
  display: flex;
  flex-direction: column;
}

.sidebar-logout-btn {
  display: block;
  width: 100%;
  padding: 8px 16px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 13px;
  font-family: var(--font);
  cursor: pointer;
  transition: all 0.15s;
}

.sidebar-logout-btn:hover {
  color: var(--red);
  border-color: rgba(239,68,68,0.3);
  background: rgba(239,68,68,0.1);
}

/* User management page */
.user-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.inline-form {
  display: inline-flex;
  gap: 6px;
  align-items: center;
}

.input-sm {
  padding: 4px 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-size: 12px;
  font-family: var(--font);
  width: 140px;
}

.input-sm:focus {
  outline: none;
  border-color: var(--accent);
}

/* CRM form sections */
.crm-form-section {
  margin-bottom: 24px;
}

.crm-section-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-grid .form-group {
  margin-bottom: 0;
}

.form-group-wide {
  grid-column: 1 / -1;
}

.form-group textarea {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 14px;
  font-family: var(--font);
  resize: vertical;
}

.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}