/* ==========================================================================
   HK Food Price Map — Material Design 3 (light + dark)
   Tokens follow the MD3 colour roles; type follows the MD3 type scale (Roboto).
   ========================================================================== */

:root {
  color-scheme: light;

  /* colour roles (light) */
  --md-primary: #1565c0;
  --md-on-primary: #ffffff;
  --md-primary-container: #d3e3fd;
  --md-on-primary-container: #041e49;
  --md-secondary-container: #dde3ea;
  --md-on-secondary-container: #161c24;
  --md-surface: #ffffff;
  --md-surface-container-low: #f7f9fc;
  --md-surface-container: #f1f4f9;
  --md-surface-container-high: #e9eef6;
  --md-on-surface: #1a1c1e;
  --md-on-surface-variant: #43474e;
  --md-outline: #73777f;
  --md-outline-variant: #c3c7cf;
  --md-scrim: #000000;

  /* elevation (MD3 levels 1–3) */
  --md-elev-1: 0 1px 2px rgba(0, 0, 0, 0.3), 0 1px 3px 1px rgba(0, 0, 0, 0.15);
  --md-elev-2: 0 1px 2px rgba(0, 0, 0, 0.3), 0 2px 6px 2px rgba(0, 0, 0, 0.15);
  --md-elev-3: 0 4px 8px 3px rgba(0, 0, 0, 0.15), 0 1px 3px rgba(0, 0, 0, 0.3);

  /* shape */
  --md-shape-s: 8px;
  --md-shape-m: 12px;
  --md-shape-l: 16px;
  --md-shape-xl: 28px;
  --md-shape-full: 999px;

  /* price bands (map + list) */
  --band-1: #2e7d32;
  --band-2: #8bc34a;
  --band-3: #fdd835;
  --band-4: #fb8c00;
  --band-5: #e53935;
  --band-none: #bdbdbd;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --md-primary: #a8c7fa;
  --md-on-primary: #003062;
  --md-primary-container: #004a8d;
  --md-on-primary-container: #d3e3fd;
  --md-secondary-container: #3d4551;
  --md-on-secondary-container: #dde3ea;
  --md-surface: #1d1f22;
  --md-surface-container-low: #1f2226;
  --md-surface-container: #24272c;
  --md-surface-container-high: #2b2f35;
  --md-on-surface: #e3e5e8;
  --md-on-surface-variant: #c3c7cf;
  --md-outline: #8d9199;
  --md-outline-variant: #44474e;
  --md-elev-1: 0 1px 2px rgba(0, 0, 0, 0.6), 0 1px 3px 1px rgba(0, 0, 0, 0.4);
  --md-elev-2: 0 1px 2px rgba(0, 0, 0, 0.6), 0 2px 6px 2px rgba(0, 0, 0, 0.4);
  --md-elev-3: 0 4px 8px 3px rgba(0, 0, 0, 0.4), 0 1px 3px rgba(0, 0, 0, 0.6);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--md-surface-container-low);
  color: var(--md-on-surface);
  font-family: Roboto, "Noto Sans HK", "Noto Sans SC", "Microsoft JhengHei", "PingFang HK", sans-serif;
  font-size: 14px;
  line-height: 20px;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s ease, color 0.2s ease;
}

h1, h2, h3, p { margin: 0; }

/* Icons: 24px Material Symbols-style SVG, inherit colour */
.md-icon { width: 24px; height: 24px; fill: currentColor; flex: none; display: block; }

/* State layer: a translucent overlay used for hover / focus / pressed */
.md-state { position: relative; overflow: hidden; }
.md-state::before {
  content: "";
  position: absolute;
  inset: 0;
  background: currentColor;
  opacity: 0;
  border-radius: inherit;
  pointer-events: none;
  transition: opacity 0.15s ease;
}
.md-state:hover::before { opacity: 0.08; }
.md-state:focus-visible::before { opacity: 0.12; }
.md-state:active::before { opacity: 0.12; }
.md-state:focus-visible { outline: 2px solid var(--md-primary); outline-offset: 2px; }

/* ==========================================================================
   Top app bar (MD3 small, 64dp)
   ========================================================================== */
.app-bar {
  position: sticky;
  top: 0;
  z-index: 1100; /* above the map's Leaflet panes and controls */
  background: var(--md-surface);
  color: var(--md-on-surface);
  box-shadow: var(--md-elev-2);
}
.app-bar__inner {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 64px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 12px 0 16px;
}
.app-bar__logo { width: 40px; height: 40px; object-fit: contain; flex: none; }
.app-bar__titles { min-width: 0; flex: 1; }
.app-bar__titles h1 {
  font-size: 22px;
  line-height: 28px;
  font-weight: 400;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.app-bar__titles p {
  font-size: 14px;
  line-height: 20px;
  color: var(--md-on-surface-variant);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.app-bar__actions { display: flex; align-items: center; gap: 8px; }

/* Icon button (MD3 standard, 40dp target, 24dp icon) */
.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 0;
  border-radius: var(--md-shape-full);
  background: transparent;
  color: var(--md-on-surface-variant);
  cursor: pointer;
}

/* Theme icon: show the moon in light mode (tap for dark), the sun in dark mode (tap for light). */
.icon-btn .icon-sun { display: none; }
:root[data-theme="dark"] .icon-btn .icon-moon { display: none; }
:root[data-theme="dark"] .icon-btn .icon-sun { display: block; }

/* Segmented button (MD3): connected group, 40dp high */
.segmented {
  display: inline-flex;
  height: 40px;
  border: 1px solid var(--md-outline);
  border-radius: var(--md-shape-full);
  overflow: hidden;
}
.segmented button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 48px;
  height: 100%;
  padding: 0 12px;
  border: 0;
  background: transparent;
  color: var(--md-on-surface);
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1px;
  cursor: pointer;
}
.segmented button + button { border-left: 1px solid var(--md-outline); }
.segmented button .md-icon { width: 18px; height: 18px; display: none; }
.segmented button.is-on { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }
.segmented button.is-on .md-icon { display: block; }

/* Switch (MD3): 52x32 track, 16dp handle (24dp with icon when on) */
.md-switch {
  position: relative;
  flex: none;
  width: 52px;
  height: 32px;
  border: 2px solid var(--md-outline);
  border-radius: var(--md-shape-full);
  background: var(--md-surface-container-high);
  cursor: pointer;
  padding: 0;
}
.md-switch::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 8px;
  width: 16px;
  height: 16px;
  transform: translateY(-50%);
  border-radius: 50%;
  background: var(--md-outline);
  transition: left 0.2s ease, width 0.2s ease, height 0.2s ease, background-color 0.2s ease;
}
.md-switch[aria-checked="true"] {
  background: var(--md-primary);
  border-color: var(--md-primary);
}
.md-switch[aria-checked="true"]::after {
  left: 24px;
  width: 24px;
  height: 24px;
  background: var(--md-on-primary);
}

/* ==========================================================================
   Navigation drawer (MD3 modal) + scrim — used on small screens
   ========================================================================== */
.scrim {
  position: fixed;
  inset: 0;
  z-index: 1150;
  background: var(--md-scrim);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.scrim.is-open { opacity: 0.32; pointer-events: auto; }

/* Opens from the right edge, where the menu button sits. */
.drawer {
  position: fixed;
  top: 0;
  bottom: 0;
  right: 0;
  z-index: 1200;
  width: 360px;
  max-width: calc(100vw - 56px);
  display: flex;
  flex-direction: column;
  background: var(--md-surface-container-low);
  color: var(--md-on-surface);
  border-radius: var(--md-shape-xl) 0 0 var(--md-shape-xl);
  box-shadow: var(--md-elev-3);
  transform: translateX(100%);
  visibility: hidden;
  transition: transform 0.25s ease, visibility 0.25s;
}
.drawer.is-open { transform: none; visibility: visible; }

.drawer__head {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 64px;
  padding: 0 12px 0 16px;
}
.drawer__head h2 { flex: 1; font-size: 22px; line-height: 28px; font-weight: 400; }

.drawer__body { overflow-y: auto; padding: 0 12px 24px; }
.drawer__section { padding: 8px 0; }
.drawer__label {
  padding: 16px 16px 8px;
  font-size: 14px;
  line-height: 20px;
  font-weight: 500;
  color: var(--md-on-surface-variant);
}

/* Drawer list item (MD3 navigation item, 56dp, pill indicator when active) */
.drawer-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 56px;
  padding: 0 16px;
  border: 0;
  border-radius: var(--md-shape-full);
  background: transparent;
  color: var(--md-on-surface);
  font: inherit;
  font-size: 16px;
  line-height: 24px;
  text-align: left;
  cursor: pointer;
}
.drawer-item.is-on { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }
.drawer-item .md-icon { color: inherit; }
.drawer-item .label { flex: 1; }
.drawer-item .check { display: none; }
.drawer-item.is-on .check { display: block; }
.drawer-item .md-switch { pointer-events: none; }

/* ==========================================================================
   Cards (MD3 outlined card)
   ========================================================================== */
.card {
  background: var(--md-surface);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-m);
  overflow: hidden;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  grid-template-areas:
    "map list"
    "detail detail";
  gap: 16px;
  max-width: 1280px;
  margin: 16px auto;
  padding: 0 16px;
}

/* Isolate Leaflet's panes and controls so their z-index cannot escape the card. */
.map-card {
  grid-area: map;
  position: relative;
  z-index: 0;
  isolation: isolate;
}
.list-card { grid-area: list; display: flex; flex-direction: column; max-height: 580px; }
.detail-card { grid-area: detail; padding: 24px; min-height: 240px; }

#map { height: 540px; width: 100%; }

/* Legend sits below the map, never over it */
.legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 16px;
  padding: 12px 16px;
  border-top: 1px solid var(--md-outline-variant);
  color: var(--md-on-surface-variant);
  font-size: 12px;
  line-height: 16px;
}
.legend__item { display: flex; align-items: center; gap: 6px; }
.legend__item i { display: inline-block; width: 12px; height: 12px; border-radius: 50%; }

/* ==========================================================================
   District list (MD3 list items, 56dp min)
   ========================================================================== */
.list-card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--md-outline-variant);
}
.list-card__head h2 { font-size: 16px; line-height: 24px; font-weight: 500; }
.hint { font-size: 12px; line-height: 16px; color: var(--md-on-surface-variant); }

.district-list { list-style: none; margin: 0; padding: 8px 0; overflow-y: auto; }
.district-list li button {
  position: relative;
  overflow: hidden;
  width: 100%;
  min-height: 56px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  border: 0;
  background: transparent;
  color: var(--md-on-surface);
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.district-list li button::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--md-on-surface);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
}
.district-list li button:hover::before { opacity: 0.08; }
.district-list li button:focus-visible { outline: 2px solid var(--md-primary); outline-offset: -2px; }
.district-list li.is-active button { background: var(--md-primary-container); color: var(--md-on-primary-container); }
.district-list .dot { width: 12px; height: 12px; border-radius: 50%; flex: none; }
.district-list .name { flex: 1; min-width: 0; font-size: 16px; line-height: 24px; }
.district-list .name small { display: block; font-size: 14px; line-height: 20px; color: var(--md-on-surface-variant); }
.district-list li.is-active .name small { color: inherit; }
.district-list .price { font-size: 16px; font-weight: 500; font-variant-numeric: tabular-nums; }
.district-list .price.none { font-size: 14px; font-weight: 400; color: var(--md-on-surface-variant); }

/* ==========================================================================
   Map markers (MD3 label-style pill, colour = price band)
   ========================================================================== */
.price-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--md-surface);
  color: var(--md-on-surface);
  border: 2px solid var(--c, var(--band-none));
  border-radius: var(--md-shape-s);
  padding: 2px 8px;
  line-height: 16px;
  white-space: nowrap;
  box-shadow: var(--md-elev-1);
  transform: translate(-50%, -50%);
  cursor: pointer;
}
.price-marker .pm-name { font-size: 11px; color: var(--md-on-surface-variant); }
.price-marker .pm-price { font-size: 13px; font-weight: 500; font-variant-numeric: tabular-nums; }
.price-marker.is-active { background: var(--c, var(--band-none)); color: #111; }
.price-marker.is-active .pm-name { color: #111; }

/* Dark map: invert the OSM tiles and tone them down */
.map-dark .leaflet-tile-pane { filter: invert(1) hue-rotate(180deg) brightness(0.85) contrast(0.95); }
.map-dark .leaflet-container { background: #1b1d21; }

/* ==========================================================================
   Detail panel
   ========================================================================== */
.detail__placeholder { color: var(--md-on-surface-variant); }
.detail__placeholder h2 { font-size: 22px; line-height: 28px; font-weight: 400; color: var(--md-on-surface); margin-bottom: 8px; }

.detail__head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 12px; margin-bottom: 16px; }
.detail__head h2 { font-size: 28px; line-height: 36px; font-weight: 400; }
.detail__head .en { font-size: 16px; line-height: 24px; color: var(--md-on-surface-variant); }

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}
.stat {
  padding: 16px;
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-m);
  background: var(--md-surface-container-low);
}
.stat__label { font-size: 12px; line-height: 16px; letter-spacing: 0.4px; color: var(--md-on-surface-variant); }
.stat__value { margin-top: 4px; font-size: 28px; line-height: 36px; font-weight: 400; font-variant-numeric: tabular-nums; }
.stat__value small { font-size: 14px; color: var(--md-on-surface-variant); }

.section-title { font-size: 16px; line-height: 24px; font-weight: 500; margin: 8px 0 12px; }

/* Assist chips (MD3): 32dp high, outlined */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 32px;
  padding: 0 12px;
  border: 1px solid var(--md-outline);
  border-radius: var(--md-shape-s);
  background: transparent;
  color: var(--md-on-surface);
  font-size: 14px;
  line-height: 20px;
  white-space: nowrap;
}
.chip b { font-weight: 500; }
.chip--info { border-color: transparent; background: var(--md-surface-container-high); color: var(--md-on-surface-variant); }

/* Post cards (MD3 outlined card inside the detail panel) */
.posts { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.post {
  padding: 16px;
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-m);
  background: var(--md-surface);
}
.post__meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: 12px; line-height: 16px; color: var(--md-on-surface-variant); margin-bottom: 8px; }
/* Tonal label (MD3 label-medium on secondary-container) */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--md-shape-s);
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  font-weight: 500;
}
.post__title { font-size: 16px; line-height: 24px; font-weight: 500; margin-bottom: 4px; }
.post__title a { color: var(--md-on-surface); text-decoration: none; }
.post__title a:hover { color: var(--md-primary); text-decoration: underline; }
.post__excerpt { font-size: 14px; line-height: 20px; color: var(--md-on-surface-variant); }

.empty {
  padding: 24px;
  text-align: center;
  color: var(--md-on-surface-variant);
  border: 1px dashed var(--md-outline-variant);
  border-radius: var(--md-shape-m);
}

/* ==========================================================================
   Footer (MD3 text buttons, 40dp)
   ========================================================================== */
.footer {
  max-width: 1280px;
  margin: 0 auto 32px;
  padding: 0 16px;
  display: grid;
  gap: 8px;
  font-size: 12px;
  line-height: 16px;
  color: var(--md-on-surface-variant);
}
.footer__crawl { font-variant-numeric: tabular-nums; }
.footer__links { display: flex; flex-wrap: wrap; gap: 4px; }
.text-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  padding: 0 12px;
  border: 0;
  border-radius: var(--md-shape-full);
  background: transparent;
  color: var(--md-primary);
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1px;
  text-decoration: none;
  cursor: pointer;
}
.text-btn .md-icon { width: 18px; height: 18px; }
.footer__wcag { display: block; height: auto; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; grid-template-areas: "map" "list" "detail"; }
  #map { height: 440px; }
  .list-card { max-height: 380px; }
}

/* Phones: language and theme move into the navigation drawer */
@media (max-width: 599px) {
  .app-bar__inner { padding: 0 4px 0 12px; }
  .app-bar__titles h1 { font-size: 18px; line-height: 24px; }
  .app-bar__titles p { display: none; }
  .app-bar__actions .desktop-only { display: none; }
  .layout { padding: 0 12px; }
  .detail-card { padding: 16px; }
  .detail__head h2 { font-size: 24px; line-height: 32px; }
}

@media (min-width: 600px) {
  .drawer-trigger { display: none; }
}