:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --success-text: #065f46;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  --danger-text: #991b1b;
  --info-bg: #eff6ff;
  --info-border: #bfdbfe;
  --info-text: #1e40af;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --radius: 8px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Navbar */
.navbar {
  background-color: #0f172a;
  color: #ffffff;
  padding: 0.85rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #1e293b;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: #ffffff;
  text-decoration: none;
}

.brand-badge {
  background-color: #3b82f6;
  color: #fff;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  text-transform: uppercase;
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-link {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.35rem 0.65rem;
  border-radius: 4px;
  transition: all 0.2s;
}

.nav-link:hover {
  color: #ffffff;
  background-color: #1e293b;
}

.nav-btn-logout {
  background: transparent;
  border: 1px solid #475569;
  color: #e2e8f0;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
}

.nav-btn-logout:hover {
  background-color: #334155;
  border-color: #64748b;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem;
  flex: 1;
  width: 100%;
}

/* Login Page */
.login-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 120px);
}

.login-card {
  background: var(--bg-card);
  padding: 2.2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
  width: 100%;
  max-width: 420px;
}

.login-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  text-align: center;
}

.login-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
  margin-bottom: 1.5rem;
}

/* Forms */
.form-group {
  margin-bottom: 1.1rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--text-main);
}

.form-hint {
  font-size: 0.775rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.form-control {
  width: 100%;
  padding: 0.55rem 0.75rem;
  font-size: 0.925rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background-color: #fff;
  color: var(--text-main);
  transition: border-color 0.15s ease-in-out;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease;
}

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

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

.btn-danger {
  background-color: var(--danger);
  color: #fff;
}

.btn-danger:hover {
  background-color: var(--danger-hover);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--border);
  color: var(--text-main);
}

.btn-outline:hover {
  background-color: #f1f5f9;
}

.btn-sm {
  padding: 0.3rem 0.6rem;
  font-size: 0.8rem;
}

.btn-block {
  width: 100%;
}

/* Cards & Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--bg-card);
  padding: 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.stat-title {
  font-size: 0.825rem;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 700;
  margin-top: 0.25rem;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
}

.card-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
}

.card-body {
  padding: 1.25rem;
}

/* Alerts */
.alert {
  padding: 0.85rem 1rem;
  border-radius: 6px;
  margin-bottom: 1.2rem;
  font-size: 0.9rem;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.alert-success {
  background-color: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-text);
}

.alert-danger {
  background-color: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger-text);
}

.alert-info {
  background-color: var(--info-bg);
  border: 1px solid var(--info-border);
  color: var(--info-text);
}

/* Badges */
.badge {
  display: inline-block;
  padding: 0.25rem 0.55rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-valid {
  background-color: var(--success-bg);
  color: var(--success-text);
  border: 1px solid var(--success-border);
}

.badge-revoked {
  background-color: var(--danger-bg);
  color: var(--danger-text);
  border: 1px solid var(--danger-border);
}

/* Tables */
.table-responsive {
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.table th {
  background-color: #f8fafc;
  padding: 0.75rem 1rem;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

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

.table tr:hover {
  background-color: #f8fafc;
}

.code-serial {
  font-family: monospace;
  font-weight: 700;
  background-color: #f1f5f9;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

/* Filter tabs & Search */
.table-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.filter-tabs {
  display: flex;
  gap: 0.35rem;
  background: #f1f5f9;
  padding: 0.25rem;
  border-radius: 6px;
}

.filter-tab {
  padding: 0.35rem 0.75rem;
  font-size: 0.825rem;
  border: none;
  background: transparent;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-muted);
  font-weight: 500;
}

.filter-tab.active {
  background: #fff;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
}

.search-input {
  max-width: 260px;
}

/* Quick links pill */
.quick-links {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Footer */
.footer {
  text-align: center;
  padding: 1.25rem;
  color: var(--text-muted);
  font-size: 0.825rem;
  border-top: 1px solid var(--border);
  margin-top: auto;
}