/* ==========================================================================
   HDB Resale Price Predictor - Design System & Modern Stylesheet
   ========================================================================== */

:root {
  /* Color Palette - Light Mode */
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.82);
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --brand-primary: #2563eb;
  --brand-primary-hover: #1d4ed8;
  --brand-gradient: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #60a5fa 100%);
  --brand-glow: rgba(37, 99, 235, 0.18);

  --accent-success: #10b981;
  --accent-success-bg: #ecfdf5;
  --accent-success-border: #a7f3d0;
  --accent-success-text: #065f46;

  --accent-purple: #8b5cf6;
  --accent-amber: #f59e0b;

  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.04), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --card-shadow-hover: 0 12px 24px -4px rgba(0, 0, 0, 0.08), 0 4px 8px -2px rgba(0, 0, 0, 0.04);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

[data-theme="dark"] {
  /* Color Palette - Dark Mode */
  --bg-primary: #090d16;
  --bg-surface: #111827;
  --bg-surface-elevated: #1a2234;
  --bg-glass: rgba(17, 24, 39, 0.85);
  --border-color: #1f293d;
  --border-hover: #334155;
  
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  
  --brand-primary: #3b82f6;
  --brand-primary-hover: #60a5fa;
  --brand-gradient: linear-gradient(135deg, #3b82f6 0%, #60a5fa 50%, #93c5fd 100%);
  --brand-glow: rgba(59, 130, 246, 0.25);

  --accent-success: #34d399;
  --accent-success-bg: rgba(16, 185, 129, 0.12);
  --accent-success-border: rgba(16, 185, 129, 0.3);
  --accent-success-text: #6ee7b7;

  --card-shadow: 0 4px 10px rgba(0, 0, 0, 0.35);
  --card-shadow-hover: 0 12px 28px rgba(0, 0, 0, 0.5);
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
}

/* Background Ambient Glows */
.ambient-glow-1 {
  position: fixed;
  top: -150px;
  left: 10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--brand-glow) 0%, rgba(37, 99, 235, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

.ambient-glow-2 {
  position: fixed;
  bottom: -200px;
  right: 5%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.12) 0%, rgba(139, 92, 246, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

/* Container */
.app-container {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px 60px;
  z-index: 1;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 28px;
}

.brand-container {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-md);
  background: var(--brand-gradient);
  color: #ffffff;
  font-size: 24px;
  box-shadow: 0 4px 12px var(--brand-glow);
}

.brand-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tagline {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

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

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 18px;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--border-hover);
  transform: scale(1.05);
}

/* Navigation Tabs */
.tabs-nav {
  display: flex;
  gap: 8px;
  background: var(--bg-surface);
  padding: 6px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  width: fit-content;
  margin-bottom: 32px;
  box-shadow: var(--card-shadow);
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--brand-primary);
  color: #ffffff;
  box-shadow: 0 2px 8px var(--brand-glow);
}

/* Tab Views */
.tab-content {
  display: none;
  animation: fadeIn 0.25s ease-out;
}

.tab-content.active {
  display: block;
}

/* Tab Button Enhancements */
.tab-btn-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
}

.tab-btn-title {
  font-size: 0.90rem;
  font-weight: 700;
  line-height: 1.2;
}

.tab-btn-tag {
  font-size: 0.66rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  opacity: 0.85;
}

.tab-btn.active .tab-btn-tag {
  opacity: 0.95;
  color: #dbeafe;
}

/* Data Mode Notification Banners */
.data-mode-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  box-shadow: var(--card-shadow);
  flex-wrap: wrap;
}

.banner-predicted {
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.22);
  color: var(--text-primary);
}

.banner-actual {
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.22);
  color: var(--text-primary);
}

.banner-left {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 280px;
  flex: 1;
}

.banner-icon {
  font-size: 1.6rem;
  flex-shrink: 0;
}

.banner-title {
  font-size: 0.95rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 2px;
}

.banner-sub {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.cutoff-badge-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.cutoff-pill {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.cutoff-pill strong {
  font-weight: 700;
}

.cutoff-pill-blue {
  background: rgba(37, 99, 235, 0.12);
  color: var(--brand-primary);
  border: 1px solid rgba(37, 99, 235, 0.28);
}

.cutoff-pill-green {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-success);
  border: 1px solid rgba(16, 185, 129, 0.28);
}

.pill-predicted-tag {
  background: #2563eb;
  color: #ffffff;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.pill-actual-tag {
  background: #10b981;
  color: #ffffff;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

/* Comparison Table in About Tab */
.cutoff-summary-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin-top: 12px;
  margin-bottom: 8px;
}

.cutoff-summary-table th {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  font-weight: 700;
  padding: 10px 12px;
  text-align: left;
  border-bottom: 2px solid var(--border-color);
}

.cutoff-summary-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.cutoff-summary-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Grid Layout for Predictor */
.predictor-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
  align-items: start;
}

@media (max-width: 960px) {
  .predictor-grid {
    grid-template-columns: 1fr;
  }
}

/* Cards */
.card {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--card-shadow);
  transition: box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.card:hover {
  box-shadow: var(--card-shadow-hover);
  border-color: var(--border-hover);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-subtitle {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* Form Styles */
.form-group {
  margin-bottom: 20px;
}

.form-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.form-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--accent-success-bg);
  color: var(--accent-success-text);
  border: 1px solid var(--accent-success-border);
}

.form-input, .form-select {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: all var(--transition-fast);
}

.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px var(--brand-glow);
}

.form-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* Range Slider Group */
.slider-container {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.slider-val-display {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--brand-primary);
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: var(--border-color);
  border-radius: var(--radius-full);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--brand-primary);
  cursor: pointer;
  box-shadow: 0 2px 6px var(--brand-glow);
  transition: transform var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

/* Unit Switch Pills */
.unit-toggle-pills {
  display: flex;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 2px;
  gap: 2px;
}

.unit-pill {
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
}

.unit-pill.active {
  background: var(--brand-primary);
  color: #ffffff;
}

/* Prediction Output Card */
.prediction-display-card {
  position: sticky;
  top: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.price-hero-section {
  text-align: center;
  padding: 24px 16px;
  border-radius: var(--radius-md);
  background: var(--accent-success-bg);
  border: 1px solid var(--accent-success-border);
}

.price-label {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-success-text);
  margin-bottom: 6px;
}

.price-number {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--accent-success-text);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.price-range-badge {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Breakdown Mini Cards */
.metrics-mini-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.metric-box {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}

.metric-box-title {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 4px;
}

.metric-box-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Offline / Inference Status */
.engine-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-success);
  display: inline-block;
  margin-right: 6px;
  box-shadow: 0 0 6px var(--accent-success);
}

/* Map Controls Header */
.map-controls-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.map-class-toggle {
  display: inline-flex;
  gap: 6px;
  background: var(--bg-surface-elevated);
  padding: 4px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
}

.map-toggle-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.map-toggle-btn:hover {
  color: var(--text-primary);
}

.map-toggle-btn.active {
  background: var(--brand-primary);
  color: #ffffff;
  box-shadow: 0 2px 8px var(--brand-glow);
}

/* Map View Container */
.map-frame-wrapper {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: var(--card-shadow);
  height: 800px;
  background: var(--bg-surface);
}

.map-frame {
  width: 100%;
  height: 100%;
  border: none;
}

/* About & Tech Stack Cards */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

@media (max-width: 860px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
}

.about-metric-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  border-radius: var(--radius-md);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
}

.about-metric-num {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--brand-primary);
}

.project-links-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}

.project-link-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  text-decoration: none;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.project-link-card:hover {
  border-color: var(--brand-primary);
  transform: translateX(4px);
}

.project-link-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.project-link-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Property Class Switcher (HDB vs Private Condo)
   ========================================================================== */
.prop-class-container {
  margin-bottom: 20px;
}

.property-class-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 5px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.prop-class-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  font-family: inherit;
  transition: all var(--transition-fast);
  text-align: left;
}

.prop-class-btn:hover {
  color: var(--text-primary);
  background: rgba(37, 99, 235, 0.05);
}

.prop-class-btn.active {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-color);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.prop-class-icon {
  font-size: 1.4rem;
  line-height: 1;
  flex-shrink: 0;
}

.prop-class-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.prop-class-title {
  font-size: 0.92rem;
  font-weight: 700;
  white-space: nowrap;
}

.prop-class-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
}

@media (max-width: 580px) {
  .property-class-toggle {
    grid-template-columns: 1fr;
  }
}

/* Market Segment Badges (CCR, RCR, OCR) */
.segment-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.segment-ccr {
  background: rgba(239, 68, 68, 0.12);
  color: #dc2626;
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.segment-rcr {
  background: rgba(245, 158, 11, 0.12);
  color: #d97706;
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.segment-ocr {
  background: rgba(16, 185, 129, 0.12);
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

/* Property Summary Badge on Price Card */
.prop-summary-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.15);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
  transition: all var(--transition-fast);
}

/* Property Category Switcher (Public vs Private) */
.prop-class-container {
  margin-bottom: 24px;
}

.property-class-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  background: var(--bg-surface);
  padding: 6px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.prop-class-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
  color: var(--text-secondary);
}

.prop-class-btn:hover {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
}

.prop-class-btn.active {
  background: var(--bg-surface-elevated);
  border-color: var(--brand-primary);
  color: var(--text-primary);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.15);
}

.prop-class-icon {
  font-size: 1.8rem;
  line-height: 1;
  flex-shrink: 0;
}

.prop-class-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.prop-class-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.prop-class-sub {
  font-size: 0.76rem;
  color: var(--text-muted);
}

@media (max-width: 600px) {
  .property-class-toggle {
    grid-template-columns: 1fr;
  }
}