:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --success: #16a34a;
  --success-light: #dcfce7;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --danger: #dc2626;
  --danger-light: #fee2e2;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --sidebar-w: 260px;
  --topbar-h: 60px;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -2px rgba(0,0,0,.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.5;
}

/* ─── Login Page ─────────────────────────────────── */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
}

.login-card {
  background: white;
  border-radius: 12px;
  padding: 40px;
  width: 400px;
  max-width: 90vw;
  box-shadow: 0 20px 60px rgba(0,0,0,.3);
}

.login-card h1 {
  font-size: 24px;
  margin-bottom: 8px;
  color: var(--gray-900);
}

.login-card p {
  color: var(--gray-500);
  margin-bottom: 24px;
}

.login-card .logo {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 24px;
  display: block;
}

/* ─── Layout ─────────────────────────────────────── */
.app-layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-w);
  background: var(--gray-900);
  color: white;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: transform .3s;
}

.sidebar-brand {
  padding: 20px 24px;
  font-size: 20px;
  font-weight: 800;
  color: white;
  border-bottom: 1px solid rgba(255,255,255,.1);
}

.sidebar-brand small {
  display: block;
  font-size: 11px;
  font-weight: 400;
  color: var(--gray-400);
  margin-top: 2px;
}

.sidebar-nav {
  flex: 1;
  padding: 12px 0;
  overflow-y: auto;
}

.nav-section {
  padding: 8px 24px 4px;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--gray-500);
  margin-top: 8px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 24px;
  color: var(--gray-400);
  text-decoration: none;
  font-size: 14px;
  cursor: pointer;
  transition: all .2s;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.nav-item:hover, .nav-item.active {
  color: white;
  background: rgba(255,255,255,.08);
}

.nav-item.active {
  border-right: 3px solid var(--primary);
}

.nav-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: 16px 24px;
  border-top: 1px solid rgba(255,255,255,.1);
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-user .avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
}

.sidebar-user .info {
  overflow: hidden;
}

.sidebar-user .info .name {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user .info .email {
  font-size: 11px;
  color: var(--gray-400);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ─── Main Content ───────────────────────────────── */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-height: 100vh;
}

.topbar {
  height: var(--topbar-h);
  background: white;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  position: sticky;
  top: 0;
  z-index: 50;
}

.topbar h2 {
  font-size: 18px;
  font-weight: 600;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.content-area {
  padding: 32px;
}

/* ─── Cards ──────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.stat-card {
  background: white;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.stat-card .label {
  font-size: 13px;
  color: var(--gray-500);
  margin-bottom: 4px;
}

.stat-card .value {
  font-size: 28px;
  font-weight: 700;
  color: var(--gray-900);
}

.stat-card .sub {
  font-size: 12px;
  color: var(--gray-400);
  margin-top: 4px;
}

.stat-card.primary { border-left: 4px solid var(--primary); }
.stat-card.success { border-left: 4px solid var(--success); }
.stat-card.warning { border-left: 4px solid var(--warning); }
.stat-card.danger { border-left: 4px solid var(--danger); }

/* ─── Table ──────────────────────────────────────── */
.card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: 24px;
}

.card-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-header h3 {
  font-size: 16px;
  font-weight: 600;
}

.card-body {
  padding: 24px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--gray-100);
  font-size: 14px;
}

th {
  font-weight: 600;
  color: var(--gray-600);
  background: var(--gray-50);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .5px;
}

tr:hover td {
  background: var(--gray-50);
}

/* ─── Badges ─────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}

.badge-active, .badge-paid { background: var(--success-light); color: var(--success); }
.badge-suspended, .badge-overdue { background: var(--danger-light); color: var(--danger); }
.badge-pending { background: var(--warning-light); color: var(--warning); }
.badge-email { background: var(--primary-light); color: var(--primary); }

/* ─── Forms ──────────────────────────────────────── */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 4px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
select,
textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--gray-300);
  border-radius: 6px;
  font-size: 14px;
  transition: border-color .2s;
  outline: none;
  background: white;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}

.input-group {
  display: flex;
  align-items: center;
}

.input-group input {
  border-radius: 6px 0 0 6px;
}

.input-group .input-addon {
  padding: 10px 12px;
  background: var(--gray-100);
  border: 1px solid var(--gray-300);
  border-left: none;
  border-radius: 0 6px 6px 0;
  font-size: 14px;
  color: var(--gray-500);
  white-space: nowrap;
}

/* ─── Buttons ────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all .2s;
  text-decoration: none;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #b91c1c; }
.btn-outline {
  background: white;
  color: var(--gray-700);
  border-color: var(--gray-300);
}
.btn-outline:hover { background: var(--gray-50); }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-icon {
  padding: 6px;
  border-radius: 6px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--gray-400);
}
.btn-icon:hover { color: var(--gray-700); background: var(--gray-100); }

.btn:disabled {
  opacity: .5;
  cursor: not-allowed;
}

/* ─── Modal ──────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  animation: fadeIn .2s;
}

.modal {
  background: white;
  border-radius: 12px;
  width: 480px;
  max-width: 90vw;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,.3);
  animation: slideUp .2s;
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 600;
}

.modal-body {
  padding: 24px;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--gray-200);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

@keyframes fadeIn { from { opacity: 0; } }
@keyframes slideUp { from { transform: translateY(20px); opacity: 0; } }

/* ─── Toast ──────────────────────────────────────── */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 20px;
  border-radius: 8px;
  color: white;
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  animation: slideIn .3s;
  max-width: 400px;
}

.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
.toast-info { background: var(--primary); }

@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } }

/* ─── Empty State ────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--gray-400);
}

.empty-state svg {
  width: 48px;
  height: 48px;
  margin-bottom: 12px;
}

.empty-state p {
  font-size: 15px;
  margin-bottom: 16px;
}

/* ─── DNS Records ────────────────────────────────── */
.dns-record {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  margin-bottom: 8px;
  font-size: 13px;
}

.dns-record .type {
  font-weight: 700;
  color: var(--primary);
}

.dns-record .value {
  word-break: break-all;
  font-family: monospace;
  font-size: 12px;
}

/* ─── Loading ────────────────────────────────────── */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .8s linear infinite;
  margin: 0 auto;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-area {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px;
}

/* ─── Responsive ─────────────────────────────────── */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--gray-700);
  cursor: pointer;
  padding: 8px;
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .main-content {
    margin-left: 0;
  }
  .mobile-toggle {
    display: block;
  }
  .content-area {
    padding: 16px;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

/* ─── Utils ──────────────────────────────────────── */
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.text-sm { font-size: 13px; }
.text-gray { color: var(--gray-500); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.font-mono { font-family: monospace; }
.hidden { display: none; }
.w-full { width: 100%; }
.text-right { text-align: right; }