/* ============================================================
   Patna GIS Explorer — Design System
   Inspired by regio.toekom.st: fixed left rail + full map
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* ── Custom Properties ────────────────────────────────────── */
:root {
  --rail-w: 288px;
  --accent: #2563eb;
  --accent-2: #3b82f6;
  --accent-glow: rgba(37,99,235,0.15);

  /* Light / White theme (default) */
  --bg:   #f7f7f8;
  --bg-2: #ffffff;
  --bg-3: #f0f0f3;
  --bg-4: #e8e8ed;
  --border: rgba(0,0,0,0.07);
  --border-strong: rgba(0,0,0,0.13);
  --text:   #111827;
  --text-2: #4b5563;
  --text-3: #9ca3af;

  --green:  #16a34a;
  --red:    #dc2626;
  --blue:   #2563eb;
  --amber:  #d97706;
  --purple: #7c3aed;

  --ease: cubic-bezier(.2,.6,.2,1);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);
  --font: 'Inter', system-ui, sans-serif;
  --font-head: 'Space Grotesk', system-ui, sans-serif;

  --shadow: 0 4px 24px rgba(0,0,0,0.10);
  --shadow-sm: 0 1px 6px rgba(0,0,0,0.07);
}

[data-theme="dark"] {
  --accent: #6366f1;
  --accent-2: #8b5cf6;
  --accent-glow: rgba(99,102,241,0.25);
  --bg: #0f0f13;
  --bg-2: #16161d;
  --bg-3: #1e1e28;
  --bg-4: #252533;
  --border: rgba(255,255,255,0.07);
  --border-strong: rgba(255,255,255,0.14);
  --text: #f0f0f8;
  --text-2: #a0a0b8;
  --text-3: #606078;
  --shadow: 0 4px 24px rgba(0,0,0,0.5);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
}

/* ── Reset & Base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; font-family: var(--font); }
body { background: var(--bg); color: var(--text); }

button { font-family: var(--font); cursor: pointer; border: none; background: none; }
input { font-family: var(--font); }

/* ── Map ──────────────────────────────────────────────────── */
#map {
  position: fixed;
  inset: 0;
  left: var(--rail-w);
  transition: left 0.3s var(--ease);
}

/* MapLibre overrides */
.maplibregl-canvas { outline: none; }
.maplibregl-ctrl-group {
  background: var(--bg-2) !important;
  border: 1px solid var(--border-strong) !important;
  border-radius: 8px !important;
  overflow: hidden;
  box-shadow: var(--shadow-sm) !important;
}
.maplibregl-ctrl-group button {
  background: transparent !important;
  color: var(--text) !important;
  border-bottom: 1px solid var(--border) !important;
  width: 36px !important;
  height: 36px !important;
}
.maplibregl-ctrl-group button:last-child { border-bottom: none !important; }
.maplibregl-ctrl-group button:hover { background: var(--bg-3) !important; }
.maplibregl-ctrl-attrib { background: rgba(0,0,0,0.5) !important; }
.maplibregl-ctrl-attrib a { color: var(--text-2) !important; }

/* ── Rail ─────────────────────────────────────────────────── */
#rail {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--rail-w);
  z-index: 100;
  background: var(--bg-2);
  border-right: 1px solid var(--border-strong);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── Rail Header ──────────────────────────────────────────── */
#rail-head {
  padding: 14px 14px 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#logo {
  display: flex;
  align-items: center;
  gap: 0;
}
.logo-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.logo-title {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--text);
  line-height: 1;
}
.logo-accent { color: var(--accent); }
.logo-sub {
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-3);
}

.logo-city-selector {
  display: flex;
  align-items: center;
  gap: 4px;
}

.city-dropdown {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-2);
  font-size: 9px;
  font-weight: 600;
  font-family: var(--font);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 4px;
  cursor: pointer;
  outline: none;
  transition: all 0.2s;
}

.city-dropdown:hover {
  color: var(--text);
  border-color: var(--text-3);
}

.city-dropdown:focus {
  border-color: var(--accent);
}

.icon-btn {
  width: 28px; height: 28px;
  border-radius: 6px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-2);
  transition: background 0.15s, color 0.15s;
}
.icon-btn:hover { background: var(--bg-4); color: var(--text); }

/* ── Stats Bar ────────────────────────────────────────────── */
#stats-bar {
  display: flex;
  align-items: center;
  padding: 8px 14px;
  background: var(--bg-3);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  gap: 1px;
}
.stat-val {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: 8.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-3);
}
.stat-divider {
  width: 1px;
  height: 28px;
  background: var(--border);
}

/* ── Tab Bar ──────────────────────────────────────────────── */
#tab-bar {
  display: flex;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--bg-2);
}
.tab-btn {
  flex: 1;
  padding: 9px 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  font-size: 9px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-3);
  border-bottom: 2px solid transparent;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease), background 0.15s;
  position: relative;
}
.tab-btn svg { opacity: 0.6; transition: opacity 0.15s; }
.tab-btn:hover { color: var(--text-2); background: var(--bg-3); }
.tab-btn:hover svg { opacity: 0.8; }
.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  background: var(--bg-3);
}
.tab-btn.active svg { opacity: 1; stroke: var(--accent); }

/* ── Tab Panels ───────────────────────────────────────────── */
.tab-panel {
  display: none;
  flex-direction: column;
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}
.tab-panel.active { display: flex; }
.tab-panel::-webkit-scrollbar { width: 4px; }
.tab-panel::-webkit-scrollbar-track { background: transparent; }
.tab-panel::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 2px; }

/* ── Panel Sections ───────────────────────────────────────── */
.panel-section {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.panel-section:last-child { border-bottom: none; }

.section-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 8px;
}

/* ── Segmented Control ────────────────────────────────────── */
.seg-control {
  display: flex;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  overflow: hidden;
}
.seg-btn {
  flex: 1;
  padding: 6px 4px;
  font-size: 10px;
  font-weight: 600;
  color: var(--text-3);
  background: transparent;
  border-right: 1px solid var(--border);
  transition: color 0.15s, background 0.15s;
  white-space: nowrap;
  text-align: center;
}
.seg-btn:last-child { border-right: none; }
.seg-btn:hover { color: var(--text); background: var(--bg-3); }
.seg-btn.active {
  color: var(--text);
  background: var(--accent);
}
.seg-btn.active { color: white; }

/* ── Layer Rows ───────────────────────────────────────────── */
.layer-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 0;
  border-radius: 6px;
  transition: background 0.15s;
  cursor: default;
}
.layer-row:hover { background: var(--bg-3); padding-left: 4px; margin: 0 -4px; }

.layer-toggle { display: flex; align-items: center; flex-shrink: 0; cursor: pointer; }
.layer-toggle input { display: none; }
.toggle-track {
  width: 28px; height: 16px;
  background: var(--bg-4);
  border-radius: 8px;
  border: 1px solid var(--border-strong);
  position: relative;
  transition: background 0.2s, border-color 0.2s;
}
.toggle-track::after {
  content: '';
  position: absolute;
  left: 2px; top: 2px;
  width: 10px; height: 10px;
  background: var(--text-3);
  border-radius: 50%;
  transition: left 0.2s var(--ease-spring), background 0.2s;
}
.layer-toggle input:checked + .toggle-track {
  background: var(--accent);
  border-color: var(--accent);
}
.layer-toggle input:checked + .toggle-track::after {
  left: 14px;
  background: white;
}

.layer-icon {
  width: 16px; height: 16px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.layer-icon svg {
  width: 100%;
  height: 100%;
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.layer-name {
  font-size: 11px;
  font-weight: 500;
  color: var(--text);
  flex: 1;
}
.layer-count {
  font-size: 9px;
  font-weight: 600;
  color: var(--text-3);
  background: var(--bg-3);
  padding: 1px 5px;
  border-radius: 10px;
}

/* ── Sliders ──────────────────────────────────────────────── */
.slider-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 3px 0;
}
.slider-label {
  font-size: 10px;
  color: var(--text-2);
  width: 55px;
  flex-shrink: 0;
}
.slider {
  flex: 1;
  appearance: none;
  height: 3px;
  border-radius: 2px;
  background: var(--bg-4);
  outline: none;
  cursor: pointer;
}
.slider::-webkit-slider-thumb {
  appearance: none;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid white;
  box-shadow: 0 1px 4px rgba(0,0,0,0.4);
  transition: transform 0.1s;
}
.slider::-webkit-slider-thumb:hover { transform: scale(1.2); }
.slider-val {
  font-size: 9px;
  font-weight: 600;
  color: var(--text-3);
  width: 28px;
  text-align: right;
}

/* ── Legend Grid ──────────────────────────────────────────── */
.legend-grid { display: flex; flex-direction: column; gap: 4px; }
.legend-row {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 10px;
  color: var(--text-2);
}
.leg-color {
  width: 22px; height: 4px;
  border-radius: 2px;
  flex-shrink: 0;
}

/* ── Gradient Legend ──────────────────────────────────────── */
.legend-gradient { margin-top: 4px; }
.grad-bar {
  height: 8px;
  border-radius: 4px;
  margin-bottom: 4px;
}
.grad-labels {
  display: flex;
  justify-content: space-between;
  font-size: 9px;
  color: var(--text-3);
  font-weight: 500;
}

/* ── Info Card ────────────────────────────────────────────── */
.info-card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  margin-bottom: 10px;
}
.info-card p {
  font-size: 10.5px;
  color: var(--text-2);
  line-height: 1.5;
}

/* ── Stats Grid ───────────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}
.stat-card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  text-align: center;
}
.stat-card-val {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
}
.stat-card-label {
  font-size: 9px;
  color: var(--text-3);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 2px;
}

/* ── Risk Legend ──────────────────────────────────────────── */
.risk-legend { display: flex; flex-direction: column; gap: 6px; margin-bottom: 10px; }
.risk-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 10.5px;
  color: var(--text-2);
}
.risk-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.risk-dot.high { background: #ef4444; box-shadow: 0 0 6px rgba(239,68,68,0.5); }
.risk-dot.medium { background: #f97316; box-shadow: 0 0 6px rgba(249,115,22,0.4); }
.risk-dot.low { background: #eab308; box-shadow: 0 0 6px rgba(234,179,8,0.4); }

/* ── Elevation Chart ──────────────────────────────────────── */
.elev-chart-wrapper {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  margin-bottom: 6px;
}
.elev-note {
  font-size: 9.5px;
  color: var(--text-3);
  line-height: 1.4;
}

/* ── Routing ──────────────────────────────────────────────── */
.route-point-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 4px;
}
.route-marker-a, .route-marker-b {
  width: 22px; height: 22px;
  border-radius: 50%;
  font-size: 10px;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  color: white;
}
.route-marker-a { background: var(--green); }
.route-marker-b { background: var(--red); }
.route-connector {
  width: 2px; height: 12px;
  background: var(--border-strong);
  margin-left: 19px;
  margin-bottom: 4px;
}
.route-point-info {
  display: flex; flex-direction: column; gap: 1px; flex: 1; min-width: 0;
}
.route-point-label {
  font-size: 9px; font-weight: 700; color: var(--text-3);
  text-transform: uppercase; letter-spacing: 0.06em;
}
.route-point-coords {
  font-size: 10px; color: var(--text-2);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.route-clear-btn {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--bg-4);
  color: var(--text-3);
  font-size: 12px;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s, color 0.15s;
  flex-shrink: 0;
}
.route-clear-btn:hover { background: var(--red); color: white; }

.route-stats-grid {
  display: flex;
  gap: 6px;
  margin-bottom: 8px;
}
.route-stat {
  flex: 1;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 4px;
  text-align: center;
}
.route-stat-icon { font-size: 14px; margin-bottom: 3px; }
.route-stat-val { font-family: var(--font-head); font-size: 13px; font-weight: 700; color: var(--accent); }
.route-stat-label { font-size: 8.5px; color: var(--text-3); font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }

.clear-route-btn {
  width: 100%;
  padding: 7px;
  background: var(--bg-3);
  border: 1px solid var(--border-strong);
  border-radius: 7px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-2);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.clear-route-btn:hover { background: rgba(244,63,94,0.15); color: var(--red); border-color: var(--red); }

.route-status-msg {
  margin: 8px 14px;
  padding: 8px 10px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 10.5px;
  color: var(--text-2);
  text-align: center;
}

.loading-indicator, .loading-done {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 10.5px;
  color: var(--text-2);
}
.loading-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 1.2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}

/* ── Footer ───────────────────────────────────────────────── */
#rail-footer {
  padding: 8px 14px;
  border-top: 1px solid var(--border);
  font-size: 8.5px;
  color: var(--text-3);
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  flex-shrink: 0;
}
.footer-sep { opacity: 0.4; }

/* ── Tooltip ──────────────────────────────────────────────── */
.map-tooltip {
  position: fixed;
  z-index: 200;
  background: var(--bg-2);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 11px;
  color: var(--text);
  box-shadow: var(--shadow);
  pointer-events: none;
  max-width: 220px;
  line-height: 1.5;
  transform: translate(10px, -50%);
  transition: opacity 0.1s;
}
.map-tooltip strong { color: var(--accent); font-size: 12px; display: block; margin-bottom: 2px; }
.map-tooltip .tt-row { display: flex; justify-content: space-between; gap: 12px; font-size: 10.5px; }
.map-tooltip .tt-row span:first-child { color: var(--text-3); }
.map-tooltip .tt-row span:last-child { font-weight: 600; }

/* ── Map Loading Overlay ──────────────────────────────────── */
#map-loading {
  position: fixed;
  inset: 0; left: var(--rail-w);
  z-index: 50;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  transition: opacity 0.5s var(--ease);
}
#map-loading.hidden { opacity: 0; pointer-events: none; }
.map-loading-inner { text-align: center; }
.spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--border-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.map-loading-text {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}
.map-loading-sub {
  font-size: 12px;
  color: var(--text-3);
}
.dots {
  animation: blink 1.4s steps(3, end) infinite;
}
@keyframes blink {
  0% { color: transparent; }
  33% { color: var(--text-3); }
  66% { color: var(--text-2); }
  100% { color: var(--text); }
}

/* ── Routing Hint ─────────────────────────────────────────── */
#routing-hint {
  position: fixed;
  bottom: 28px;
  left: calc(var(--rail-w) + 50%);
  transform: translateX(-50%);
  z-index: 150;
  pointer-events: none;
}
.routing-hint-inner {
  background: var(--accent);
  color: white;
  font-size: 12px;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 20px;
  box-shadow: var(--shadow), 0 0 0 4px var(--accent-glow);
  animation: float 2s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

/* ── Scrollbar for rail ───────────────────────────────────── */
#rail { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }

/* ── Mobile Menu ────────────────────────────────────────────── */
#mobile-menu-btn {
  display: none;
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 90;
  background: var(--bg-2);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: 20px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  align-items: center;
  gap: 8px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}
#mobile-menu-btn:active {
  transform: translateX(-50%) scale(0.95);
}
#mobile-close-btn {
  display: none;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 600px) {
  :root { --rail-w: 100vw; }
  #rail { 
    transform: translateX(-100%); 
    transition: transform 0.3s var(--ease);
    width: 100%;
    box-shadow: 4px 0 24px rgba(0,0,0,0.2);
  }
  body.show-rail #rail { transform: translateX(0); }
  #map { left: 0; }
  #mobile-menu-btn { display: flex; }
  #mobile-close-btn { display: flex; }
  
  /* Fix centering on mobile */
  #routing-hint { left: 50%; width: max-content; }
  #map-loading { left: 0; }
}