/* Segmentaur CustomerServices Portal — Modern Soviet Design */
:root {
  --sidebar-width: 260px;
  --header-height: 60px;
  --primary-color: #1a1d2e;
  --secondary-color: #12141f;
  --accent-color: #6366f1;
  --accent-hover: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.25);
  --text-light: #e2e8f0;
  --card-border-radius: 0.75rem;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --surface-color: #ffffff;
  --surface-secondary: #f8fafc;
  --border-color: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --info-color: #06b6d4;
}

html {
  font-size: 14px;
  height: 100%;
}

@media (min-width: 768px) {
  html { font-size: 15px; }
}

body {
  min-height: 100%;
  margin: 0;
  padding: 0;
  background-color: var(--surface-secondary);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Sidebar */
.sidebar {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--sidebar-width);
  background: linear-gradient(180deg, var(--primary-color) 0%, #161929 50%, var(--secondary-color) 100%);
  color: var(--text-light);
  z-index: 1000;
  overflow-y: auto;
  box-shadow: 4px 0 24px rgba(0, 0, 0, 0.15);
  border-right: 1px solid rgba(255, 255, 255, 0.04);
}

.sidebar-header {
  padding: 1.25rem 1.25rem 0.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.sidebar-brand {
  color: white;
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.sidebar-brand i { margin-right: 0.6rem; font-size: 1.3rem; }

.sidebar-subtitle {
  color: rgba(255,255,255,0.4);
  font-size: 0.75rem;
  padding: 0.25rem 0 0 2rem;
}

.sidebar-menu { padding: 0.75rem 0; }

.sidebar-menu .nav-link {
  padding: 0.6rem 1.25rem;
  color: rgba(255, 255, 255, 0.6);
  display: flex;
  align-items: center;
  font-size: 0.875rem;
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: all 0.15s ease;
}

.sidebar-menu .nav-link:hover {
  color: #fff;
  background-color: rgba(255, 255, 255, 0.05);
  border-left-color: var(--accent-color);
}

.sidebar-menu .nav-link.active {
  color: #fff;
  background-color: rgba(99, 102, 241, 0.12);
  border-left-color: var(--accent-color);
}

.sidebar-menu .nav-link i {
  margin-right: 0.75rem;
  font-size: 1rem;
  width: 1.25rem;
  text-align: center;
  opacity: 0.85;
}

/* Main content */
.main-content {
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  width: calc(100% - var(--sidebar-width));
  display: flex;
  flex-direction: column;
}

.content-wrapper {
  padding: 1.75rem 2rem;
  flex: 1 1 0;
}

/* Cards */
.card {
  border: 1px solid var(--border-color);
  border-radius: var(--card-border-radius);
  box-shadow: var(--card-shadow);
  margin-bottom: 1.5rem;
  background: var(--surface-color);
}

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

/* Forms */
.form-control, .form-select {
  border-color: var(--border-color);
  border-radius: 0.5rem;
  font-size: 0.875rem;
}

.form-control:focus {
  box-shadow: 0 0 0 3px var(--accent-glow);
  border-color: var(--accent-color);
}

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

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

/* Tables */
.table th {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  font-weight: 600;
}

@media (max-width: 768px) {
  .sidebar { margin-left: calc(-1 * var(--sidebar-width)); }
  .sidebar.active { margin-left: 0; }
  .main-content { width: 100%; margin-left: 0; }
}