/* Gürcom Restoran - Enterprise Design System (Dark & Light) */
:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  
  /* Brand Accent: Emerald Green */
  --primary: #10b981;
  --primary-hover: #059669;
  --primary-subtle: rgba(16, 185, 129, 0.12);
  --primary-contrast: #ffffff;
  
  /* Status Colors */
  --status-empty: #64748b;
  --status-occupied: #10b981;
  --status-reserved: #3b82f6;
  --status-bill: #f59e0b;
  --status-payment: #8b5cf6;
  --status-closed: #ef4444;
  
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --warning: #f59e0b;
  --info: #3b82f6;
  --success: #10b981;

  --transition-fast: 0.15s ease;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* DARK THEME (Varsayılan Kömür & Antrasit) */
[data-theme="dark"], :root:not([data-theme="light"]) {
  --bg-app: #121417;          /* Kömür Siyahı */
  --bg-surface: #1a1d23;      /* Antrasit Panel */
  --bg-surface-hover: #222730;
  --bg-subtle: #16181d;
  --border: #2a2f38;          /* İnce Kenarlık */
  --border-focus: #10b981;
  
  --text-main: #f1f5f9;       /* Kırık Beyaz / Açık Gri */
  --text-muted: #94a3b8;      /* Nötr Gri */
  --text-dim: #64748b;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-modal: 0 20px 25px -5px rgba(0, 0, 0, 0.7);
}

/* LIGHT THEME (Temiz Nötr Gri & Kırık Beyaz) */
[data-theme="light"] {
  --bg-app: #f8fafc;          /* Kırık Beyaz Zemin */
  --bg-surface: #ffffff;      /* Beyaz Panel */
  --bg-surface-hover: #f1f5f9;
  --bg-subtle: #f1f5f9;
  --border: #e2e8f0;          /* İnce Açık Kenarlık */
  --border-focus: #059669;
  
  --text-main: #0f172a;       /* Koyu Antrasit */
  --text-muted: #475569;      /* Orta Nötr */
  --text-dim: #94a3b8;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07);
  --shadow-modal: 0 20px 25px -5px rgba(0, 0, 0, 0.15);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  min-height: 100vh;
}

/* APP SHELL LAYOUT */
.app-container {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 250px;
  background-color: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: width var(--transition-fast);
  z-index: 50;
}

.sidebar-collapsed {
  width: 72px;
}

.sidebar-brand {
  height: 64px;
  display: flex;
  align-items: center;
  padding: 0 20px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  border-bottom: 1px solid var(--border);
  gap: 12px;
}

.sidebar-brand .brand-badge {
  background-color: var(--primary);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.nav-list {
  list-style: none;
  padding: 12px 8px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.nav-item.active a {
  background-color: var(--primary-subtle);
  color: var(--primary);
  font-weight: 600;
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  height: 64px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  gap: 16px;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

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

.page-body {
  padding: 24px;
  flex: 1;
  overflow-y: auto;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  min-height: 40px;
}

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

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-main);
  border-color: var(--border);
}
.btn-secondary:hover {
  background-color: var(--bg-surface-hover);
}

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

.btn-sm {
  padding: 6px 12px;
  font-size: 0.82rem;
  min-height: 32px;
}

.btn-lg {
  padding: 14px 24px;
  font-size: 1.05rem;
  min-height: 48px;
}

/* CARDS & PANELS */
.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
}

/* FORM CONTROLS */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 10px 14px;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 0.92rem;
  transition: border-color var(--transition-fast);
}

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

/* STATUS BADGES */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.badge-empty { background-color: rgba(100, 116, 139, 0.15); color: #94a3b8; }
.badge-occupied { background-color: rgba(16, 185, 129, 0.15); color: #10b981; }
.badge-reserved { background-color: rgba(59, 130, 246, 0.15); color: #3b82f6; }
.badge-bill { background-color: rgba(245, 158, 11, 0.15); color: #f59e0b; }
.badge-payment { background-color: rgba(139, 92, 246, 0.15); color: #8b5cf6; }

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

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.data-table th {
  padding: 12px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  background-color: var(--bg-subtle);
}

.data-table td {
  padding: 14px 16px;
  font-size: 0.9rem;
  color: var(--text-main);
  border-bottom: 1px solid var(--border);
}

.data-table tr:hover td {
  background-color: var(--bg-surface-hover);
}

/* KDS (KITCHEN DISPLAY SYSTEM) STYLES */
.kds-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

.kds-card {
  background-color: var(--bg-surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.kds-card.delayed {
  border-color: var(--danger);
  animation: pulse-danger 2s infinite;
}

.kds-header {
  padding: 12px 16px;
  background-color: var(--bg-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
}

.kds-table-badge {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
}

.kds-timer {
  font-size: 1.15rem;
  font-weight: 700;
  font-family: monospace;
  color: var(--primary);
}

.kds-card.delayed .kds-timer {
  color: var(--danger);
}

.kds-items {
  padding: 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.kds-item-row {
  display: flex;
  justify-content: space-between;
  font-size: 1.1rem;
  font-weight: 600;
}

.kds-item-notes {
  font-size: 0.88rem;
  color: var(--warning);
  font-weight: 500;
  margin-top: 2px;
}

.kds-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--border);
  background-color: var(--bg-subtle);
}

@keyframes pulse-danger {
  0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
  70% { box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
  100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

/* RESPONSIVE BREAKPOINTS */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: -250px;
    height: 100vh;
  }
  .sidebar.mobile-open {
    left: 0;
  }
  .page-body {
    padding: 16px;
  }
  .topbar {
    padding: 0 16px;
  }
}