/* ============================================
   SG Tax Platform - Design System
   Singapore-themed professional tax software
   ============================================ */

:root {
  /* Singapore Colors */
  --sg-red: #EE2737;
  --sg-red-dark: #C41E3A;
  --sg-red-light: #FFE5E8;
  
  /* Primary Palette */
  --primary: #1e40af;
  --primary-light: #3b82f6;
  --primary-dark: #1e3a8a;
  --primary-ghost: #eff6ff;
  
  /* Semantic Colors */
  --success: #10b981;
  --success-light: #d1fae5;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --info: #3b82f6;
  --info-light: #dbeafe;
  
  /* Neutrals */
  --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;
  
  /* Layout */
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.1), 0 10px 10px rgba(0,0,0,0.04);
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

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

body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  color: var(--gray-800);
  background: var(--gray-50);
  overflow-x: hidden;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--gray-900);
}

h1 { font-size: 28px; }
h2 { font-size: 24px; }
h3 { font-size: 20px; }
h4 { font-size: 16px; }
h5 { font-size: 14px; }
h6 { font-size: 12px; }

.text-sm { font-size: 13px; }
.text-xs { font-size: 11px; }
.text-muted { color: var(--gray-500); }
.text-bold { font-weight: 600; }
.font-mono { font-family: var(--font-mono); }

/* ============================================
   Layout Components
   ============================================ */

.app-container {
  display: flex;
  min-height: 100vh;
  background: var(--gray-100);
}

.sidebar {
  width: 260px;
  background: linear-gradient(180deg, #1e3a8a 0%, #1e40af 100%);
  color: white;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 100;
}

.sidebar-header {
  padding: 24px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 700;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--sg-red);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 20px;
}

.nav-menu {
  flex: 1;
  padding: 20px 0;
  overflow-y: auto;
}

.nav-section {
  margin-bottom: 24px;
}

.nav-section-title {
  padding: 0 20px 8px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: rgba(255,255,255,0.5);
  font-weight: 600;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 20px;
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border-left: 3px solid transparent;
}

.nav-item:hover {
  background: rgba(255,255,255,0.1);
  color: white;
}

.nav-item.active {
  background: rgba(255,255,255,0.15);
  color: white;
  border-left-color: var(--sg-red);
  font-weight: 600;
}

.nav-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.main-content {
  margin-left: 260px;
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.topbar {
  height: 64px;
  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;
  box-shadow: var(--shadow-sm);
}

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

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--gray-500);
  font-size: 13px;
}

.breadcrumb-separator {
  color: var(--gray-300);
}

.breadcrumb-current {
  color: var(--gray-900);
  font-weight: 600;
}

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

.page-container {
  padding: 32px;
  max-width: 1600px;
  margin: 0 auto;
  width: 100%;
}

.page-header {
  margin-bottom: 24px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.page-description {
  color: var(--gray-600);
  font-size: 14px;
}

/* ============================================
   Cards & Panels
   ============================================ */

.card {
  background: white;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

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

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-900);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-body {
  padding: 24px;
}

.card-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--gray-200);
  background: var(--gray-50);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--border-radius);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--gray-100);
  color: var(--gray-700);
  border-color: var(--gray-300);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--gray-200);
}

.btn-success {
  background: var(--success);
  color: white;
}

.btn-success:hover:not(:disabled) {
  background: #059669;
  transform: translateY(-1px);
}

.btn-warning {
  background: var(--warning);
  color: white;
}

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

.btn-ghost {
  background: transparent;
  color: var(--gray-700);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--gray-100);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

.btn-lg {
  padding: 12px 24px;
  font-size: 15px;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 50%;
}

/* ============================================
   Forms
   ============================================ */

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-700);
}

.form-control {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--gray-300);
  border-radius: var(--border-radius);
  font-size: 14px;
  transition: all 0.2s;
  font-family: var(--font-sans);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-ghost);
}

select.form-control {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

/* ============================================
   Tables
   ============================================ */

.table-container {
  overflow-x: auto;
  border-radius: var(--border-radius);
  border: 1px solid var(--gray-200);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

thead {
  background: var(--gray-50);
  border-bottom: 2px solid var(--gray-200);
}

th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  color: var(--gray-700);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--gray-100);
}

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

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

.table-number {
  font-family: var(--font-mono);
  text-align: right;
}

/* ============================================
   Badges & Tags
   ============================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.badge-success {
  background: var(--success-light);
  color: #065f46;
}

.badge-warning {
  background: var(--warning-light);
  color: #92400e;
}

.badge-danger {
  background: var(--danger-light);
  color: #991b1b;
}

.badge-info {
  background: var(--info-light);
  color: #1e40af;
}

.badge-gray {
  background: var(--gray-200);
  color: var(--gray-700);
}

/* ============================================
   AI Components
   ============================================ */

.ai-panel {
  width: 360px;
  background: white;
  border-left: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  position: fixed;
  right: 0;
  top: 64px;
  bottom: 0;
  box-shadow: var(--shadow-xl);
  z-index: 40;
}

.ai-header {
  padding: 20px;
  border-bottom: 1px solid var(--gray-200);
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.ai-context {
  font-size: 11px;
  opacity: 0.9;
  margin-bottom: 4px;
}

.ai-title {
  font-size: 16px;
  font-weight: 600;
}

.ai-chat {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ai-message {
  display: flex;
  gap: 12px;
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.ai-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 16px;
}

.ai-avatar.bot {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.ai-avatar.user {
  background: var(--gray-300);
}

.ai-bubble {
  background: var(--gray-100);
  padding: 12px 14px;
  border-radius: 12px;
  font-size: 13px;
  line-height: 1.5;
  max-width: 260px;
}

.ai-message.user .ai-bubble {
  background: var(--primary);
  color: white;
}

.ai-reference {
  margin-top: 8px;
  padding: 8px 10px;
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  font-size: 11px;
}

.ai-ref-label {
  color: var(--gray-500);
  margin-bottom: 4px;
}

.ai-ref-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.ai-ref-link:hover {
  text-decoration: underline;
}

.ai-quick-actions {
  padding: 16px 20px;
  border-top: 1px solid var(--gray-200);
  background: var(--gray-50);
}

.ai-action-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--gray-600);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.ai-action-btn {
  display: block;
  width: 100%;
  padding: 8px 12px;
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  text-align: left;
  font-size: 13px;
  color: var(--gray-700);
  cursor: pointer;
  margin-bottom: 6px;
  transition: all 0.2s;
}

.ai-action-btn:hover {
  background: var(--primary-ghost);
  border-color: var(--primary-light);
  color: var(--primary);
}

/* ============================================
   Status Indicators
   ============================================ */

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.status-dot.success {
  background: var(--success);
  box-shadow: 0 0 0 3px var(--success-light);
}

.status-dot.warning {
  background: var(--warning);
  box-shadow: 0 0 0 3px var(--warning-light);
}

.status-dot.danger {
  background: var(--danger);
  box-shadow: 0 0 0 3px var(--danger-light);
}

/* ============================================
   Progress & Metrics
   ============================================ */

.progress-bar {
  height: 8px;
  background: var(--gray-200);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--success) 0%, #34d399 100%);
  transition: width 0.5s ease-out;
}

.metric-card {
  background: white;
  padding: 20px;
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--gray-200);
  transition: all 0.2s;
}

.metric-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.metric-label {
  font-size: 12px;
  color: var(--gray-500);
  margin-bottom: 8px;
  font-weight: 500;
}

.metric-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--gray-900);
  font-family: var(--font-mono);
}

.metric-change {
  font-size: 13px;
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.metric-change.positive {
  color: var(--success);
}

.metric-change.negative {
  color: var(--danger);
}

/* ============================================
   Modal & Overlays
   ============================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.2s;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal {
  background: white;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-xl);
  max-width: 90vw;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

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

.modal-footer {
  padding: 20px 24px;
  border-top: 1px solid var(--gray-200);
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  background: var(--gray-50);
}

/* ============================================
   Tabs
   ============================================ */

.tabs {
  display: flex;
  border-bottom: 2px solid var(--gray-200);
  gap: 4px;
  margin-bottom: 24px;
}

.tab {
  padding: 12px 20px;
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--gray-600);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: -2px;
}

.tab:hover {
  color: var(--gray-900);
  background: var(--gray-50);
}

.tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 600;
}

/* ============================================
   Utilities
   ============================================ */

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.p-4 { padding: 16px; }
.hidden { display: none; }
.text-right { text-align: right; }
.text-center { text-align: center; }
.cursor-pointer { cursor: pointer; }

/* Alert Boxes */
.alert {
  padding: 14px 16px;
  border-radius: var(--border-radius);
  border-left: 4px solid;
  margin-bottom: 16px;
  font-size: 13px;
  display: flex;
  align-items: start;
  gap: 12px;
}

.alert-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.alert-info {
  background: var(--info-light);
  border-color: var(--info);
  color: #1e3a8a;
}

.alert-success {
  background: var(--success-light);
  border-color: var(--success);
  color: #065f46;
}

.alert-warning {
  background: var(--warning-light);
  border-color: var(--warning);
  color: #92400e;
}

.alert-danger {
  background: var(--danger-light);
  border-color: var(--danger);
  color: #991b1b;
}