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

:root {
  --driving-color: #4285f4;
  --cycling-color: #34a853;
  --walking-color: #f59e0b;
  --driving-bg: #e8f0fe;
  --cycling-bg: #e6f4ea;
  --walking-bg: #fef3c7;
  --sidebar-w: 380px;
  --radius: 12px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --text-primary: #1a1a2e;
  --text-secondary: #64748b;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --border-color: #e2e8f0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  color: var(--text-primary);
  overflow: hidden;
  height: 100vh;
}

/* ===== Layout ===== */
#app {
  display: flex;
  height: 100vh;
}

.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  height: 100vh;
  background: var(--bg-primary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 1000;
}

.map-container {
  flex: 1;
  position: relative;
}

#map {
  width: 100%;
  height: 100%;
}

/* ===== Sidebar Header ===== */
.sidebar-header {
  padding: 20px 20px 0;
}

.sidebar-header h1 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ===== Input Section ===== */
.input-section {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
}

.input-group {
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border: 1.5px solid var(--border-color);
  border-radius: 10px;
  padding: 0 8px 0 12px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-group:focus-within {
  border-color: var(--driving-color);
  box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.12);
}

.input-icon {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-right: 10px;
}

.start-icon {
  background: var(--cycling-color);
  box-shadow: 0 0 0 3px rgba(52, 168, 83, 0.2);
}

.end-icon {
  background: #ea4335;
  box-shadow: 0 0 0 3px rgba(234, 67, 53, 0.2);
}

.input-group input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 11px 4px;
  font-size: 14px;
  outline: none;
  color: var(--text-primary);
}

.input-group input::placeholder {
  color: #94a3b8;
}

.pick-btn {
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
}

.pick-btn:hover {
  background: var(--border-color);
  color: var(--driving-color);
}

.pick-btn.active {
  background: var(--driving-bg);
  color: var(--driving-color);
}

.swap-btn-wrapper {
  display: flex;
  justify-content: center;
  margin: 4px 0;
}

#swapBtn {
  width: 28px;
  height: 28px;
  border: 1.5px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

#swapBtn:hover {
  border-color: var(--driving-color);
  color: var(--driving-color);
  transform: rotate(180deg);
}

.plan-btn {
  width: 100%;
  margin-top: 12px;
  padding: 12px;
  border: none;
  border-radius: 10px;
  background: var(--driving-color);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background 0.2s, transform 0.1s, opacity 0.2s;
}

.plan-btn:hover:not(:disabled) {
  background: #3367d6;
  transform: translateY(-1px);
}

.plan-btn:active:not(:disabled) {
  transform: translateY(0);
}

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

/* ===== Route Results ===== */
.route-results {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: opacity 0.3s;
}

.route-results.hidden {
  display: none;
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
}

.results-header h2 {
  font-size: 15px;
  font-weight: 600;
}

.clear-btn {
  border: none;
  background: none;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: background 0.2s;
}

.clear-btn:hover {
  background: var(--bg-secondary);
  color: #ea4335;
}

/* ===== Route Tabs ===== */
.route-tabs {
  display: flex;
  padding: 8px 16px;
  gap: 6px;
  border-bottom: 1px solid var(--border-color);
}

.route-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 8px;
  border: 1.5px solid var(--border-color);
  border-radius: 10px;
  background: var(--bg-primary);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.route-tab:hover {
  border-color: #cbd5e1;
  background: var(--bg-secondary);
}

.route-tab.active[data-mode='driving'] {
  border-color: var(--driving-color);
  background: var(--driving-bg);
  color: var(--driving-color);
}

.route-tab.active[data-mode='cycling'] {
  border-color: var(--cycling-color);
  background: var(--cycling-bg);
  color: var(--cycling-color);
}

.route-tab.active[data-mode='walking'] {
  border-color: var(--walking-color);
  background: var(--walking-bg);
  color: var(--walking-color);
}

/* ===== Route Cards ===== */
.route-cards {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px;
}

.route-card {
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 10px;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  animation: cardSlideIn 0.35s cubic-bezier(0.4, 0, 0.2, 1) both;
}

.route-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  border-radius: 4px 0 0 4px;
  transition: background 0.2s;
}

.route-card:hover {
  border-color: #cbd5e1;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.route-card.active {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.route-card.driving::before { background: var(--driving-color); }
.route-card.cycling::before { background: var(--cycling-color); }
.route-card.walking::before { background: var(--walking-color); }

.route-card.active.driving { border-color: var(--driving-color); background: var(--driving-bg); }
.route-card.active.cycling { border-color: var(--cycling-color); background: var(--cycling-bg); }
.route-card.active.walking { border-color: var(--walking-color); background: var(--walking-bg); }

.card-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 10px;
}

.card-name {
  font-size: 14px;
  font-weight: 600;
}

.card-tag {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.route-card.active.driving .card-tag { background: rgba(66,133,244,0.15); color: var(--driving-color); }
.route-card.active.cycling .card-tag { background: rgba(52,168,83,0.15); color: var(--cycling-color); }
.route-card.active.walking .card-tag { background: rgba(245,158,11,0.15); color: var(--walking-color); }

.card-stats {
  display: flex;
  gap: 16px;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.2;
}

.stat-label {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.card-extra {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border-color);
  font-size: 12px;
  color: var(--text-secondary);
}

.route-card.active .card-extra {
  border-color: rgba(0, 0, 0, 0.08);
}

.card-extra svg {
  flex-shrink: 0;
}

.card-detail-btn {
  margin-left: auto;
  font-size: 12px;
  color: var(--driving-color);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 4px;
}

@keyframes cardSlideIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.route-card:nth-child(1) { animation-delay: 0s; }
.route-card:nth-child(2) { animation-delay: 0.06s; }
.route-card:nth-child(3) { animation-delay: 0.12s; }

/* ===== Route Steps ===== */
.route-steps {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: slideInRight 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.route-steps.hidden {
  display: none;
}

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

.steps-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
}

.back-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  border: none;
  background: none;
  color: var(--driving-color);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: background 0.2s;
}

.back-btn:hover {
  background: var(--driving-bg);
}

.steps-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}

.steps-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 16px;
}

.step-item {
  display: flex;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background 0.15s;
  border-radius: 8px;
  padding-left: 8px;
  padding-right: 8px;
  animation: stepFadeIn 0.3s ease both;
}

.step-item:hover {
  background: var(--bg-secondary);
}

.step-item:last-child {
  border-bottom: none;
}

@keyframes stepFadeIn {
  from { opacity: 0; transform: translateX(8px); }
  to { opacity: 1; transform: translateX(0); }
}

.step-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--text-secondary);
}

.step-content {
  flex: 1;
  min-width: 0;
}

.step-instruction {
  font-size: 13px;
  font-weight: 500;
  line-height: 1.4;
}

.step-meta {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ===== Empty State ===== */
.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--text-secondary);
  text-align: center;
  font-size: 14px;
  line-height: 1.6;
}

.empty-state.hidden {
  display: none;
}

/* ===== Map Tooltip ===== */
.map-tooltip {
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-primary);
  color: #fff;
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  z-index: 1000;
  box-shadow: var(--shadow-lg);
  animation: tooltipIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

.map-tooltip.hidden {
  display: none;
}

@keyframes tooltipIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-8px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ===== Loading Overlay ===== */
.loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  animation: fadeIn 0.2s;
}

.loading-overlay.hidden {
  display: none;
}

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

.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

.spinner-ring {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border-color);
  border-top-color: var(--driving-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ===== Custom Leaflet Styles ===== */
.custom-marker {
  display: flex;
  align-items: center;
  justify-content: center;
}

.marker-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 3px solid #fff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.marker-dot.start {
  background: var(--cycling-color);
}

.marker-dot.end {
  background: #ea4335;
}

.marker-label {
  position: absolute;
  top: -28px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-primary);
  color: #fff;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.route-popup .leaflet-popup-content-wrapper {
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
}

.route-popup .leaflet-popup-content {
  margin: 10px 14px;
  font-size: 13px;
  line-height: 1.5;
}

.popup-title {
  font-weight: 600;
  margin-bottom: 4px;
}

.popup-meta {
  color: var(--text-secondary);
  font-size: 12px;
}

/* ===== Scrollbar ===== */
.route-cards::-webkit-scrollbar,
.steps-list::-webkit-scrollbar {
  width: 4px;
}

.route-cards::-webkit-scrollbar-track,
.steps-list::-webkit-scrollbar-track {
  background: transparent;
}

.route-cards::-webkit-scrollbar-thumb,
.steps-list::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  #app {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    min-width: 100%;
    height: auto;
    max-height: 50vh;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }

  .map-container {
    height: 50vh;
  }
}

/* Route line animation */
.leaflet-overlay-pane svg path {
  transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              stroke-width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}