/* MailNode Gateway - Dark Theme Premium Design */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #0f1629;
  --bg-card: rgba(15, 23, 42, 0.8);
  --bg-card-hover: rgba(22, 33, 62, 0.9);
  --bg-sidebar: #070b14;
  --bg-input: #1a2332;
  --border-color: rgba(56, 78, 119, 0.3);
  --border-active: rgba(59, 130, 246, 0.5);
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.15);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #06b6d4;
  --sidebar-width: 260px;
  --sidebar-collapsed: 70px;
  --header-height: 64px;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --transition: all 0.2s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 14px; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

/* Layout */
.app-layout { display: flex; min-height: 100vh; }
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  position: fixed; top: 0; left: 0; bottom: 0;
  z-index: 100; display: flex; flex-direction: column;
  transition: width 0.3s ease;
  overflow-x: hidden;
}
.sidebar-header {
  height: var(--header-height);
  display: flex; align-items: center;
  padding: 0 20px; gap: 12px;
  border-bottom: 1px solid var(--border-color);
}
.sidebar-logo {
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 16px; color: white; flex-shrink: 0;
}
.sidebar-brand { font-weight: 600; font-size: 16px; white-space: nowrap; }
.sidebar-nav { flex: 1; padding: 16px 12px; overflow-y: auto; }
.sidebar-nav a, .nav-link {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 14px; border-radius: var(--radius-sm);
  color: var(--text-secondary); font-size: 13px; font-weight: 500;
  transition: var(--transition); white-space: nowrap; cursor: pointer;
}
.sidebar-nav a:hover, .nav-link:hover { background: var(--accent-glow); color: var(--text-primary); }
.sidebar-nav a.active, .nav-link.active {
  background: var(--accent-glow); color: var(--accent);
  border-left: 3px solid var(--accent); margin-left: -3px;
}
.sidebar-nav a i, .nav-link i { width: 20px; text-align: center; font-size: 15px; flex-shrink: 0; }
.nav-section { padding: 20px 14px 8px; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); font-weight: 600; }
.sidebar-footer { padding: 16px; border-top: 1px solid var(--border-color); }

.main-content {
  margin-left: var(--sidebar-width);
  flex: 1; min-width: 0;
}
.top-bar {
  height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px; position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
}
.top-bar h1 { font-size: 18px; font-weight: 600; }
.page-content { padding: 28px; }

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  transition: var(--transition);
}
.card:hover { border-color: var(--border-active); }
.card-header {
  padding: 18px 22px;
  border-bottom: 1px solid var(--border-color);
  display: flex; align-items: center; justify-content: space-between;
}
.card-header h2, .card-header h3 { font-size: 15px; font-weight: 600; }
.card-body { padding: 22px; }

/* Stat Cards */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; margin-bottom: 28px; }
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 22px;
  transition: var(--transition);
  position: relative; overflow: hidden;
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--border-active); }
.stat-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), #8b5cf6);
}
.stat-card.success::before { background: linear-gradient(90deg, var(--success), #34d399); }
.stat-card.warning::before { background: linear-gradient(90deg, var(--warning), #fbbf24); }
.stat-card.danger::before { background: linear-gradient(90deg, var(--danger), #f87171); }
.stat-card.info::before { background: linear-gradient(90deg, var(--info), #22d3ee); }
.stat-label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; font-weight: 600; margin-bottom: 8px; }
.stat-value { font-size: 28px; font-weight: 700; line-height: 1.2; }
.stat-change { font-size: 12px; margin-top: 8px; display: flex; align-items: center; gap: 4px; }
.stat-change.up { color: var(--success); }
.stat-change.down { color: var(--danger); }

/* Tables */
.table-container { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
thead { position: sticky; top: 0; }
th {
  padding: 12px 16px; text-align: left; font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.5px;
  color: var(--text-muted); font-weight: 600;
  background: var(--bg-secondary); border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}
td {
  padding: 12px 16px; border-bottom: 1px solid rgba(56, 78, 119, 0.15);
  font-size: 13px; color: var(--text-secondary);
}
tr:hover td { background: rgba(59, 130, 246, 0.03); color: var(--text-primary); }
td:first-child { color: var(--text-primary); }

/* Badges */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border-radius: 50px; font-size: 11px;
  font-weight: 600; text-transform: uppercase; letter-spacing: 0.3px;
}
.badge-success { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.badge-warning { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
.badge-danger { background: rgba(239, 68, 68, 0.15); color: #f87171; }
.badge-info { background: rgba(6, 182, 212, 0.15); color: #22d3ee; }
.badge-muted { background: rgba(100, 116, 139, 0.15); color: #94a3b8; }
.badge-primary { background: rgba(59, 130, 246, 0.15); color: #60a5fa; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 18px; border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 500; border: none;
  cursor: pointer; transition: var(--transition);
  text-decoration: none; white-space: nowrap;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); color: white; box-shadow: 0 0 20px var(--accent-glow); }
.btn-secondary { background: var(--bg-input); color: var(--text-primary); border: 1px solid var(--border-color); }
.btn-secondary:hover { border-color: var(--border-active); background: var(--bg-card-hover); }
.btn-danger { background: rgba(239, 68, 68, 0.15); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.3); }
.btn-danger:hover { background: rgba(239, 68, 68, 0.25); }
.btn-sm { padding: 5px 12px; font-size: 12px; }
.btn-icon { padding: 8px; width: 36px; height: 36px; justify-content: center; }
.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }

/* Forms */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 12px; font-weight: 600; color: var(--text-secondary); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.3px; }
.form-control {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 13px;
  font-family: inherit;
  transition: var(--transition);
}
.form-control:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
select.form-control { cursor: pointer; appearance: auto; }
textarea.form-control { min-height: 100px; resize: vertical; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-text { font-size: 11px; color: var(--text-muted); margin-top: 4px; }
.form-check { display: flex; align-items: center; gap: 8px; }
.form-check input[type="checkbox"] { accent-color: var(--accent); width: 16px; height: 16px; }

/* Filters */
.filters {
  display: flex; gap: 12px; align-items: end; flex-wrap: wrap;
  padding: 16px 22px; border-bottom: 1px solid var(--border-color);
}
.filter-group { display: flex; flex-direction: column; gap: 4px; }
.filter-group label { font-size: 11px; color: var(--text-muted); font-weight: 600; text-transform: uppercase; }
.filter-group .form-control { min-width: 160px; padding: 7px 12px; font-size: 12px; }

/* Pagination */
.pagination { display: flex; align-items: center; justify-content: center; gap: 4px; padding: 20px 0; }
.pagination a, .pagination span {
  display: flex; align-items: center; justify-content: center;
  min-width: 36px; height: 36px; padding: 0 12px;
  border-radius: var(--radius-sm); font-size: 13px; font-weight: 500;
  border: 1px solid var(--border-color); color: var(--text-secondary);
  transition: var(--transition);
}
.pagination a:hover { border-color: var(--accent); color: var(--accent); }
.pagination .active { background: var(--accent); border-color: var(--accent); color: white; }
.pagination .disabled { opacity: 0.4; pointer-events: none; }

/* Login Page */
.login-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: var(--bg-primary);
  background-image: radial-gradient(ellipse at top, rgba(59, 130, 246, 0.08), transparent 50%),
                    radial-gradient(ellipse at bottom right, rgba(139, 92, 246, 0.06), transparent 50%);
}
.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 40px;
  width: 100%; max-width: 420px;
  backdrop-filter: blur(20px);
}
.login-logo {
  width: 48px; height: 48px;
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  border-radius: var(--radius-sm); margin: 0 auto 24px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 22px; color: white;
}
.login-card h1 { text-align: center; font-size: 22px; margin-bottom: 6px; }
.login-card p { text-align: center; color: var(--text-muted); font-size: 14px; margin-bottom: 28px; }
.login-card .btn { width: 100%; justify-content: center; padding: 12px; font-size: 14px; }
.alert { padding: 12px 16px; border-radius: var(--radius-sm); margin-bottom: 20px; font-size: 13px; }
.alert-danger { background: rgba(239, 68, 68, 0.1); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.2); }
.alert-success { background: rgba(16, 185, 129, 0.1); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.2); }

/* Toast */
.toast-container { position: fixed; top: 20px; right: 20px; z-index: 10000; display: flex; flex-direction: column; gap: 8px; }
.toast {
  padding: 14px 20px; border-radius: var(--radius-sm);
  background: var(--bg-card); border: 1px solid var(--border-color);
  color: var(--text-primary); font-size: 13px;
  box-shadow: var(--shadow-lg); backdrop-filter: blur(12px);
  animation: slideIn 0.3s ease;
  display: flex; align-items: center; gap: 10px;
}
.toast.success { border-color: rgba(16, 185, 129, 0.4); }
.toast.error { border-color: rgba(239, 68, 68, 0.4); }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* Empty State */
.empty-state {
  text-align: center; padding: 60px 20px;
  color: var(--text-muted);
}
.empty-state i { font-size: 48px; margin-bottom: 16px; opacity: 0.3; }
.empty-state h3 { font-size: 16px; color: var(--text-secondary); margin-bottom: 8px; }

/* Chart Container */
.chart-container { position: relative; height: 300px; }

/* Grid layouts */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }

/* Detail View */
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 8px 0; }
.detail-item label { font-size: 11px; text-transform: uppercase; color: var(--text-muted); font-weight: 600; display: block; margin-bottom: 4px; }
.detail-item span, .detail-item div { font-size: 14px; color: var(--text-primary); word-break: break-all; }
.detail-full { grid-column: 1 / -1; }

/* Code Block */
.code-block {
  background: #0d1117; border: 1px solid var(--border-color);
  border-radius: var(--radius-sm); padding: 16px; overflow-x: auto;
  position: relative;
}
.code-block pre { font-family: 'JetBrains Mono', 'Fira Code', monospace; font-size: 12.5px; line-height: 1.7; color: #e6edf3; white-space: pre; }
.code-block .copy-btn {
  position: absolute; top: 8px; right: 8px;
  background: rgba(255,255,255,0.1); border: none; color: var(--text-muted);
  padding: 4px 10px; border-radius: 4px; cursor: pointer; font-size: 11px;
}
.code-block .copy-btn:hover { background: rgba(255,255,255,0.2); color: var(--text-primary); }

/* Tab Navigation */
.tabs { display: flex; border-bottom: 1px solid var(--border-color); gap: 0; }
.tab {
  padding: 12px 20px; font-size: 13px; font-weight: 500;
  color: var(--text-muted); cursor: pointer; transition: var(--transition);
  border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tab:hover { color: var(--text-primary); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(100, 116, 139, 0.3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(100, 116, 139, 0.5); }

/* Reply Body */
.reply-body {
  background: var(--bg-input); border: 1px solid var(--border-color);
  border-radius: var(--radius-sm); padding: 20px;
  max-height: 500px; overflow-y: auto;
}
.reply-body iframe {
  width: 100%; border: none; min-height: 300px;
}

/* Responsive */
@media (max-width: 1024px) {
  .sidebar { width: var(--sidebar-collapsed); }
  .sidebar .sidebar-brand, .sidebar-nav a span, .nav-link span, .nav-section { display: none; }
  .sidebar-nav a, .nav-link { justify-content: center; padding: 12px; }
  .main-content { margin-left: var(--sidebar-collapsed); }
  .form-row { grid-template-columns: 1fr; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
}

/* Unread badge */
.unread-badge {
  background: var(--danger); color: white;
  font-size: 10px; font-weight: 700;
  padding: 2px 6px; border-radius: 50px;
  min-width: 18px; text-align: center;
}

/* Skeleton loader */
.skeleton {
  background: linear-gradient(90deg, var(--bg-input) 25%, var(--bg-card-hover) 50%, var(--bg-input) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 4px;
}
@keyframes shimmer { 0% { background-position: -200% 0; } 100% { background-position: 200% 0; } }

/* Modal */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6);
  z-index: 1000; display: none; align-items: center; justify-content: center;
  backdrop-filter: blur(4px);
}
.modal-overlay.active { display: flex; }
.modal {
  background: var(--bg-secondary); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 28px;
  max-width: 500px; width: 90%;
  box-shadow: var(--shadow-lg);
}
.modal h3 { margin-bottom: 16px; }