/**
 * Material 3 Expressive Design System
 * Official M3 Expressive Tokens, Tonal Surfaces, Springs & Responsive Layout
 */

:root {
  /* M3 Expressive Color Roles (Light Theme default) */
  --md-sys-color-primary: #005ac1;
  --md-sys-color-on-primary: #ffffff;
  --md-sys-color-primary-container: #d8e2ff;
  --md-sys-color-on-primary-container: #001a41;

  --md-sys-color-secondary: #006877;
  --md-sys-color-on-secondary: #ffffff;
  --md-sys-color-secondary-container: #a1efff;
  --md-sys-color-on-secondary-container: #001f25;

  --md-sys-color-tertiary: #6750a4;
  --md-sys-color-on-tertiary: #ffffff;
  --md-sys-color-tertiary-container: #eaddff;
  --md-sys-color-on-tertiary-container: #21005d;

  --md-sys-color-error: #ba1a1a;
  --md-sys-color-on-error: #ffffff;
  --md-sys-color-error-container: #ffdad6;
  --md-sys-color-on-error-container: #410002;

  --md-sys-color-surface: #fdfcff;
  --md-sys-color-on-surface: #1a1c1e;
  --md-sys-color-surface-variant: #dfe2eb;
  --md-sys-color-on-surface-variant: #43474e;

  /* M3 Expressive Tiered Surface Containers */
  --md-sys-color-surface-container-lowest: #ffffff;
  --md-sys-color-surface-container-low: #f7f9fe;
  --md-sys-color-surface-container: #f1f4f9;
  --md-sys-color-surface-container-high: #eaeef4;
  --md-sys-color-surface-container-highest: #e2e6ec;

  --md-sys-color-outline: #73777f;
  --md-sys-color-outline-variant: #c3c7d0;

  /* Accent Live & Status Colors */
  --md-sys-color-live-green: #008744;
  --md-sys-color-live-green-container: #d4edda;
  --md-sys-color-amber-alert: #d97706;
  --md-sys-color-amber-container: #fef3c7;

  /* M3 Expressive Corner Shapes */
  --md-sys-shape-corner-none: 0px;
  --md-sys-shape-corner-extra-small: 4px;
  --md-sys-shape-corner-small: 8px;
  --md-sys-shape-corner-medium: 12px;
  --md-sys-shape-corner-large: 16px;
  --md-sys-shape-corner-extra-large: 28px;
  --md-sys-shape-corner-full: 9999px;

  /* M3 Expressive Spring Motion Curves */
  --md-sys-motion-easing-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --md-sys-motion-easing-emphasized: cubic-bezier(0.2, 0.0, 0, 1.0);
  --md-sys-motion-easing-standard: cubic-bezier(0.2, 0.0, 0.2, 1.0);
  --md-sys-motion-duration-short: 150ms;
  --md-sys-motion-duration-medium: 300ms;
  --md-sys-motion-duration-long: 500ms;

  /* Elevation Shadows with Tonal Tint */
  --md-sys-elevation-1: 0px 1px 3px 1px rgba(0, 0, 0, 0.08), 0px 1px 2px 0px rgba(0, 0, 0, 0.05);
  --md-sys-elevation-2: 0px 2px 6px 2px rgba(0, 0, 0, 0.08), 0px 1px 2px 0px rgba(0, 0, 0, 0.04);
  --md-sys-elevation-3: 0px 4px 12px 3px rgba(0, 0, 0, 0.08), 0px 1px 3px 0px rgba(0, 0, 0, 0.04);
}

/* Light Mode Enforced */
html, body {
  color-scheme: light !important;
}

/* Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: 'Inter', 'Noto Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  line-height: 1.5;
  overflow-x: hidden;
}

/* App Header */
.m3-top-app-bar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--md-sys-color-surface-container);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.m3-app-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--md-sys-color-primary);
  letter-spacing: -0.02em;
}

.m3-badge {
  font-size: 0.7rem;
  font-weight: 800;
  padding: 0.2rem 0.6rem;
  border-radius: var(--md-sys-shape-corner-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.m3-badge-live {
  background: var(--md-sys-color-live-green-container);
  color: var(--md-sys-color-live-green);
  border: 1px solid rgba(0, 135, 68, 0.2);
}

.m3-badge-scheduled {
  background: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
}

.m3-pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: currentColor;
  animation: pulseAnimation 1.8s infinite;
}

@keyframes pulseAnimation {
  0% { transform: scale(0.9); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.4; }
  100% { transform: scale(0.9); opacity: 1; }
}

/* Search Bar (Expressive Pill Container) */
.m3-search-container {
  padding: 0.75rem 1rem;
  position: relative;
  background: var(--md-sys-color-surface);
}

.m3-search-bar {
  display: flex;
  align-items: center;
  background: var(--md-sys-color-surface-container-high);
  border-radius: var(--md-sys-shape-corner-full);
  padding: 0.6rem 1.25rem;
  gap: 0.75rem;
  box-shadow: var(--md-sys-elevation-1);
  transition: all var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-spring);
  border: 1.5px solid transparent;
}

.m3-search-bar:focus-within {
  border-color: var(--md-sys-color-primary);
  background: var(--md-sys-color-surface-container-lowest);
  box-shadow: var(--md-sys-elevation-2);
  transform: translateY(-1px);
}

.m3-search-bar input {
  flex: 1;
  border: none;
  background: transparent;
  outline: none;
  font-size: 1rem;
  font-family: inherit;
  color: var(--md-sys-color-on-surface);
}

.m3-search-bar input::placeholder {
  color: var(--md-sys-color-outline);
}

/* Segmented Button Groups & Filter Chips */
.m3-chips-scroll {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 0.5rem 1rem;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.m3-chips-scroll::-webkit-scrollbar {
  display: none;
}

.m3-filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border-radius: var(--md-sys-shape-corner-small);
  background: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface-variant);
  border: 1px solid var(--md-sys-color-outline-variant);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
  user-select: none;
}

.m3-filter-chip:hover {
  background: var(--md-sys-color-surface-container-high);
  transform: translateY(-1px);
}

.m3-filter-chip.active {
  background: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
  border-color: transparent;
  font-weight: 700;
}

.m3-filter-chip:active {
  transform: scale(0.96);
}

/* Expressive Cards */
.m3-card {
  background: var(--md-sys-color-surface-container-lowest);
  border-radius: var(--md-sys-shape-corner-extra-large);
  border: 1px solid var(--md-sys-color-outline-variant);
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--md-sys-elevation-1);
  transition: all var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-spring);
  position: relative;
  overflow: hidden;
}

.m3-card:hover {
  box-shadow: var(--md-sys-elevation-2);
  transform: translateY(-2px);
}

.m3-card-tonal {
  background: var(--md-sys-color-surface-container);
  border: none;
}

/* Floating Action Button (FAB) */
.m3-fab {
  position: fixed;
  bottom: 5.5rem;
  right: 1.25rem;
  z-index: 990;
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  border: none;
  border-radius: var(--md-sys-shape-corner-large);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 0.95rem;
  box-shadow: var(--md-sys-elevation-3);
  cursor: pointer;
  transition: all var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-spring);
}

.m3-fab:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: var(--md-sys-elevation-3);
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
}

.m3-fab:active {
  transform: scale(0.95);
}

/* Bottom Navigation Bar (Mobile / Compact) */
.m3-nav-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--md-sys-color-surface-container);
  border-top: 1px solid var(--md-sys-color-outline-variant);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  align-items: center;
  padding: 0.35rem 0.25rem calc(0.35rem + env(safe-area-inset-bottom, 0px));
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.m3-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
  color: var(--md-sys-color-on-surface-variant);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.2rem 0;
  width: 100%;
  text-align: center;
  transition: color var(--md-sys-motion-duration-short);
  -webkit-tap-highlight-color: transparent;
}

.m3-nav-item span {
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.m3-nav-pill {
  width: 52px;
  height: 30px;
  border-radius: var(--md-sys-shape-corner-full);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-spring);
}

.m3-nav-item.active .m3-nav-pill {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
}

.m3-nav-item.active {
  color: var(--md-sys-color-on-surface);
  font-weight: 700;
}

/* Modal / Bottom Sheet Dialog */
.m3-dialog-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(4px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--md-sys-motion-duration-medium) ease;
}

.m3-dialog-backdrop.open,
.m3-dialog-backdrop.active {
  display: flex;
  opacity: 1;
}

.m3-dialog-content {
  background: var(--md-sys-color-surface-container-lowest);
  border-radius: var(--md-sys-shape-corner-extra-large);
  padding: 1.75rem;
  width: 90%;
  max-width: 480px;
  box-shadow: var(--md-sys-elevation-3);
  transform: translateY(20px);
  transition: transform var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-spring);
}

.m3-dialog-backdrop.open .m3-dialog-content,
.m3-dialog-backdrop.active .m3-dialog-content {
  transform: translateY(0);
}

/* Buttons */
.m3-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--md-sys-shape-corner-full);
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.m3-btn-primary {
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
}

.m3-btn-primary:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.m3-btn-tonal {
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
}

.m3-btn-tonal:hover {
  background: var(--md-sys-color-surface-container-highest);
}

/* Dynamic M3 Icon Button */
.m3-icon-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  color: var(--md-sys-color-on-surface);
  border: 1.5px solid var(--md-sys-color-outline-variant);
  cursor: pointer;
  position: relative;
  transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
  padding: 0;
  outline: none;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.m3-icon-btn:hover {
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-primary);
  border-color: var(--md-sys-color-primary);
  transform: translateY(-1px);
  box-shadow: 0 2px 5px rgba(0, 90, 193, 0.15);
}

.m3-icon-btn:active {
  transform: scale(0.94);
}

.m3-icon-btn.active {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-primary);
  border-color: var(--md-sys-color-primary);
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.spin-animation {
  animation: spin 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Layout Container */
.m3-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
  padding-bottom: 6rem;
}

/* Responsive Grid for Split View */
.m3-main-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 992px) {
  .m3-main-grid {
    grid-template-columns: 460px 1fr;
    height: calc(100vh - 72px);
    overflow: hidden;
  }

  .m3-sidebar-scroll {
    overflow-y: auto;
    padding-right: 0.5rem;
  }
}

/* ================= METRO & TRAM TRANSIT STYLES ================= */

.metro-station-cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .metro-station-cards-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
}

.metro-station-card {
  background: var(--md-sys-color-surface-container-lowest);
  border: 1.5px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-medium);
  padding: 0.9rem 1rem;
  cursor: pointer;
  transition: transform 0.2s var(--md-sys-motion-easing-spring), box-shadow 0.2s ease, border-color 0.2s ease;
}

.metro-station-card:hover {
  transform: translateY(-2px);
  border-color: var(--md-sys-color-primary);
  box-shadow: var(--md-sys-elevation-2);
}

.metro-station-card:active {
  transform: scale(0.98);
}

/* Metro Map Custom DivIcons */
.metro-div-icon {
  background: transparent !important;
  border: none !important;
}

.metro-map-pin {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #ffffff;
  border: 3px solid #005ac1;
  box-shadow: 0 2px 4px rgba(0,0,0,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease;
}

.metro-map-pin:hover {
  transform: scale(1.3);
  z-index: 1000;
}

.metro-map-pin .metro-pin-inner {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #005ac1;
}

.metro-map-pin.interchange {
  width: 24px;
  height: 24px;
  border-width: 4px;
  box-shadow: 0 3px 6px rgba(0,0,0,0.35);
}

.metro-map-pin.interchange .metro-pin-inner {
  width: 8px;
  height: 8px;
}

/* Filter Chip Dot */
.m3-filter-chip-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 4px;
}

/* Badges for Metro Lines */
.badge-m1 {
  background: #008751;
  color: #fff;
  padding: 1px 6px;
  border-radius: 9999px;
  font-size: 0.7rem;
  font-weight: 800;
}

.badge-m2 {
  background: #DA291C;
  color: #fff;
  padding: 1px 6px;
  border-radius: 9999px;
  font-size: 0.7rem;
  font-weight: 800;
}

.badge-m3 {
  background: #0066B2;
  color: #fff;
  padding: 1px 6px;
  border-radius: 9999px;
  font-size: 0.7rem;
  font-weight: 800;
}

.badge-tram {
  background: #FFB81C;
  color: #000;
  padding: 1px 6px;
  border-radius: 9999px;
  font-size: 0.7rem;
  font-weight: 800;
}

/* Route Map Directional Arrows & Pins */
.route-dir-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.route-map-stop {
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.15s ease;
}

.route-map-stop:hover {
  transform: scale(1.2);
  z-index: 1000 !important;
}

.route-live-bus {
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  animation: pulse-glow 2s infinite ease-in-out;
}

@keyframes pulse-glow {
  0%, 100% {
    filter: drop-shadow(0 0 2px rgba(225, 29, 72, 0.4));
  }
  50% {
    filter: drop-shadow(0 0 6px rgba(225, 29, 72, 0.9));
  }
}

/* Material 3 Top Bar Back Button */
.m3-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-primary);
  border: 1.5px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-full);
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 800;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
  min-height: 38px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  -webkit-tap-highlight-color: transparent;
}

.m3-back-btn:hover {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  border-color: var(--md-sys-color-primary);
}

.m3-back-btn:active {
  transform: scale(0.95);
}

/* Floating Action Back Button (Easy One-Hand Phone Reach) */
.m3-fab-back {
  position: fixed;
  bottom: 82px;
  left: 16px;
  z-index: 950;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--md-sys-color-primary);
  color: #ffffff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(0, 90, 193, 0.35);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.2, 0, 0, 1);
  -webkit-tap-highlight-color: transparent;
}

.m3-fab-back:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0, 90, 193, 0.45);
}

.m3-fab-back:active {
  transform: scale(0.92);
}