/* ==========================================================================
   KathiraveluLab Interactive Metro Map - Stylesheet
   Modern Glassmorphic Design System with Dark/Light Mode
   ========================================================================== */

:root {
  /* Color Palette - Dark Mode (Default) */
  --bg-primary: #070d18;
  --bg-secondary: #0f172a;
  --bg-tertiary: #1e293b;
  --bg-card: rgba(15, 23, 42, 0.85);
  --bg-card-hover: rgba(30, 41, 59, 0.9);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-bright: #38bdf8;
  
  --border-color: rgba(51, 65, 85, 0.6);
  --border-focus: #38bdf8;
  
  /* Line Colors */
  --line-soa: #0284c7;
  --line-soa-glow: rgba(2, 132, 199, 0.4);
  --line-net: #d97706;
  --line-net-glow: rgba(217, 119, 6, 0.4);
  --line-health: #059669;
  --line-health-glow: rgba(5, 150, 105, 0.4);
  --line-trust: #7c3aed;
  --line-trust-glow: rgba(124, 58, 237, 0.4);
  --line-community: #64748b;
  --line-community-glow: rgba(100, 116, 139, 0.4);
  --line-shuttle: #e11d48;
  --line-shuttle-glow: rgba(225, 29, 72, 0.4);

  /* Typography */
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Shadows & Glass */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.6);
  --glass-blur: blur(14px);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --drawer-width: 440px;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.92);
  --bg-card-hover: #ffffff;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-bright: #0284c7;
  
  --border-color: rgba(203, 213, 225, 0.8);
  --border-focus: #0284c7;
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
}

[data-theme="light"] .bg {
  fill: #ffffff;
}

[data-theme="light"] .station-label {
  fill: #0f172a;
  filter: none;
}

[data-theme="light"] .station-sub {
  fill: #475569;
  filter: none;
}

[data-theme="light"] .station-core {
  fill: #ffffff !important;
}

[data-theme="light"] .grid-layer {
  opacity: 0.5;
}

[data-theme="light"] .grid-layer line {
  stroke: #e2e8f0;
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Top App Bar Header */
.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 68px;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 50;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  flex-shrink: 0;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #0284c7, #7c3aed);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 20px;
  box-shadow: 0 2px 10px rgba(2, 132, 199, 0.4);
}

.brand-info h1 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text-primary);
  line-height: 1.2;
}

.brand-info p {
  font-size: 11px;
  color: var(--text-secondary);
}

/* Line Filter Pills in Header */
.line-filters {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0;
  scrollbar-width: none;
}
.line-filters::-webkit-scrollbar {
  display: none;
}

.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.brand-full {
  display: inline;
}
.brand-short {
  display: none;
}

.filter-label-short,
.filter-label-micro {
  display: none;
}
.filter-label-full {
  display: inline;
}

.btn-text-short {
  display: none;
}
.btn-text-full {
  display: inline;
}

@media (max-width: 1700px) {
  .filter-label-short,
  .btn-text-short {
    display: inline;
  }
  .filter-label-full,
  .filter-label-micro,
  .btn-text-full {
    display: none;
  }
  .search-input {
    width: 130px;
  }
  .search-input:focus {
    width: 180px;
  }
}

@media (max-width: 1100px) {
  .brand-full {
    display: none;
  }
  .brand-short {
    display: inline;
  }
  .filter-label-full,
  .filter-label-short {
    display: none;
  }
  .filter-label-micro,
  .btn-text-short {
    display: inline;
  }
  .filter-btn {
    padding: 3px 6px;
    font-size: 10.5px;
    gap: 3px;
  }
  .search-input {
    width: 80px;
  }
  .search-input:focus {
    width: 130px;
  }
}

.filter-btn .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

.filter-btn.active {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: currentColor;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.25);
}

/* Header Action Controls */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input {
  width: 200px;
  height: 36px;
  padding: 0 12px 0 32px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 12px;
  font-family: var(--font-body);
  transition: all 0.2s ease;
}

.search-input:focus {
  outline: none;
  width: 250px;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

.search-icon {
  position: absolute;
  left: 10px;
  font-size: 14px;
  color: var(--text-muted);
  pointer-events: none;
}

.btn-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 16px;
  transition: all 0.2s ease;
}

.btn-icon:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 14px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #0284c7, #2563eb);
  color: #ffffff;
  border: none;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
  transition: all 0.2s ease;
}

.btn-primary:hover {
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.5);
  transform: translateY(-1px);
}

/* 2D Panning Canvas Viewport Container (Modern Web Guidance Spec) */
.canvas-viewport {
  position: absolute;
  top: 68px;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  background-color: var(--bg-primary);
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}

.canvas-viewport:active {
  cursor: grabbing;
}

.canvas-viewport:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: -2px;
}

/* Canvas Surface hosting the SVG */
.canvas-surface {
  position: absolute;
  top: 0;
  left: 0;
  width: 1680px;
  height: 980px;
  transform-origin: 0 0;
  cursor: grab;
  will-change: transform;
}

.canvas-surface:active {
  cursor: grabbing;
}

#metro-svg {
  width: 1680px;
  height: 980px;
  display: block;
}

/* Floating Canvas Controls (Bottom Right) */
.canvas-controls {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  padding: 6px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  z-index: 40;
}

/* Station Hover & Interactive Styles - Rock Solid & Flicker-Free */
.station-node {
  cursor: pointer;
  outline: none;
}

/* Generous stationary hitbox for reliable clicks */
.station-hitbox {
  pointer-events: all !important;
  cursor: pointer;
}

/* Prevent decorative, animated, and text elements from hijacking pointer events */
.hub-outer-pulse,
.track-main,
.track-underglow,
.grid-layer,
.zones-layer {
  pointer-events: none;
}

.station-label,
.station-sub,
.station-venue,
.station-num {
  pointer-events: none;
  user-select: none;
}

/* Smooth visual hover without any geometric transform displacement */
.station-node:hover .station-core {
  stroke-width: 6.5px;
  filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.9));
}

.station-node:hover .station-label {
  fill: #38bdf8 !important;
  filter: drop-shadow(0 0 6px rgba(56, 189, 248, 0.6));
}

.station-node.active-station .station-core {
  stroke-width: 7.5px;
  filter: drop-shadow(0 0 14px #38bdf8);
}

.station-node.active-station .station-label {
  fill: #38bdf8 !important;
  font-weight: 800;
}

.station-node.dimmed,
.track-main.dimmed,
.track-underglow.dimmed {
  opacity: 0.15 !important;
  transition: opacity 0.3s ease;
}

.station-node.highlighted .station-core {
  filter: drop-shadow(0 0 12px #38bdf8);
}

.station-label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  fill: var(--text-primary);
  filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.7));
  transition: fill 0.2s ease;
}

.station-sub {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 10.5px;
  fill: var(--text-secondary);
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.5));
}

.station-venue {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 600;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.5));
}

/* Pulsing Hub Keyframe - Opacity & Stroke Width (Zero Transform Displacement) */
@keyframes hub-pulse {
  0% { opacity: 0.25; stroke-width: 1px; }
  50% { opacity: 0.7; stroke-width: 3.5px; }
  100% { opacity: 0.25; stroke-width: 1px; }
}

.hub-outer-pulse {
  animation: hub-pulse 2.4s infinite ease-in-out;
  pointer-events: none !important;
}

/* Station Inspector Drawer (Slide-Over Panel) */
.station-drawer {
  position: fixed;
  top: 68px;
  right: 0;
  bottom: 0;
  width: var(--drawer-width);
  max-width: 90vw;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-left: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  z-index: 60;
  display: flex;
  flex-direction: column;
  transform: translateX(105%);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  overflow-y: auto;
}

.station-drawer.open {
  transform: translateX(0);
}

.drawer-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  position: sticky;
  top: 0;
  background: var(--bg-card);
  z-index: 10;
}

.drawer-station-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.station-id-pill {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: #0284c7;
  color: #fff;
}

.station-line-pill {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.drawer-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
}

.drawer-subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.btn-close-drawer {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 22px;
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
  transition: color 0.2s;
}

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

.drawer-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.drawer-section h3 {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-bright);
  margin-bottom: 10px;
}

.drawer-desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* Publication Venue Cards */
.venue-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.venue-card {
  padding: 12px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.venue-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.venue-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  color: var(--text-primary);
}

.venue-tier {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.15);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.venue-note {
  font-size: 11.5px;
  color: var(--text-secondary);
}

/* Tech Stack Badges */
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

/* GitHub Repositories Section */
.repo-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.repo-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 12px;
  transition: all 0.2s ease;
}

.repo-link:hover {
  background: var(--bg-secondary);
  border-color: var(--border-focus);
  color: var(--text-bright);
  transform: translateX(4px);
}

.archive-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 9999px;
  background: rgba(225, 29, 72, 0.12);
  color: #e11d48;
  border: 1px solid rgba(225, 29, 72, 0.25);
  font-weight: 600;
  vertical-align: middle;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Connected Stations Junctions */
.connected-stations {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.connected-btn {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.connected-btn:hover {
  border-color: var(--border-focus);
  background: var(--bg-secondary);
}

/* Floating Status Bar (Bottom Left) */
.status-bar {
  position: fixed;
  bottom: 24px;
  left: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  font-size: 12px;
  color: var(--text-secondary);
  z-index: 40;
}

.status-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #10b981;
}

/* Responsive Overrides */
@media (max-width: 900px) {
  .app-header {
    height: 56px;
    padding: 0 12px;
    gap: 8px;
  }
  .brand-info p {
    display: none;
  }
  .brand-info h1 {
    font-size: 15px;
  }
  .brand-icon {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }
  .canvas-viewport {
    top: 56px;
  }
  .search-input {
    width: 140px;
  }
  :root {
    --drawer-width: 100%;
  }
}

/* Embedded iframe specific styles */
body.is-embedded .app-header {
  height: 52px;
  padding: 0 10px;
  gap: 8px;
}
body.is-embedded .brand-info p {
  display: none;
}
body.is-embedded .brand-full {
  display: none;
}
body.is-embedded .brand-short {
  display: inline;
}
body.is-embedded .brand-info h1 {
  font-size: 13.5px;
  white-space: nowrap;
}
body.is-embedded .brand-icon {
  width: 26px;
  height: 26px;
  font-size: 13px;
}
body.is-embedded .line-filters {
  flex: 1 1 auto;
  min-width: 0;
  gap: 4px;
}
body.is-embedded .filter-label-full,
body.is-embedded .filter-label-short {
  display: none;
}
body.is-embedded .filter-label-micro,
body.is-embedded .btn-text-short {
  display: inline;
}
body.is-embedded .filter-btn {
  padding: 3px 6px;
  font-size: 10px;
  gap: 3px;
}
body.is-embedded .filter-btn .dot {
  width: 6.5px;
  height: 6.5px;
}
body.is-embedded .header-actions {
  gap: 4px;
}
body.is-embedded .search-box {
  flex-shrink: 1;
}
body.is-embedded .search-input {
  width: 72px;
  height: 30px;
  font-size: 11px;
  padding: 0 6px 0 22px;
}
body.is-embedded .search-input:focus {
  width: 120px;
}
body.is-embedded .search-icon {
  left: 7px;
  font-size: 12px;
}
body.is-embedded .btn-primary {
  height: 32px;
  padding: 0 8px;
  font-size: 11px;
  gap: 4px;
}
body.is-embedded .btn-icon {
  width: 30px;
  height: 30px;
  font-size: 13px;
}
body.is-embedded .canvas-viewport {
  top: 52px;
}
body.is-embedded .status-bar {
  bottom: 10px;
  left: 10px;
  padding: 4px 8px;
  font-size: 10.5px;
}
body.is-embedded .canvas-controls {
  bottom: 10px;
  right: 10px;
}