:root {
  --bg: #0d0f12;
  --bg-soft: #14171c;
  --bg-raised: #1a1f26;
  --line: rgba(255,255,255,0.07);
  --line-strong: rgba(255,255,255,0.14);
  --ink: #ecece6;
  --ink-dim: #8a8f98;
  --ink-faint: #5a5f68;
  --accent: #22d3b8;
  --accent-glow: rgba(34,211,184,0.35);
  --warn: #ffb347;
  --danger: #ff6b6b;
  --display: "Fraunces", ui-serif, Georgia, serif;
  --body: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --shadow-1: 0 1px 2px rgba(0,0,0,0.3), 0 8px 24px rgba(0,0,0,0.35);
  --shadow-2: 0 12px 48px rgba(0,0,0,0.55);
  --radius: 14px;
  --sheet-peek: 104px;
  --sheet-full: min(68vh, 520px);
  --topbar-h: 72px;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 15px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overscroll-behavior: none;
}

body {
  /* subtle noise overlay for warmth */
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(34,211,184,0.05), transparent 60%),
    radial-gradient(800px 500px at -10% 110%, rgba(255,180,100,0.04), transparent 55%),
    var(--bg);
}

/* MAP ----------------------------------------------------------- */

#map {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: var(--bg);
}

/* Tone the map: Leaflet tiles get a subtle overlay treatment */
.leaflet-container {
  background: var(--bg) !important;
  font-family: var(--body);
}
.leaflet-tile {
  filter: grayscale(0.55) contrast(0.92) brightness(0.74) hue-rotate(-5deg);
}
.leaflet-control-attribution {
  background: rgba(13,15,18,0.7) !important;
  color: var(--ink-dim) !important;
  backdrop-filter: blur(8px);
  border-radius: 8px;
  padding: 2px 8px !important;
  margin: 6px !important;
  font-size: 10px !important;
}
.leaflet-control-attribution a { color: var(--ink) !important; }
.leaflet-bar {
  border: none !important;
  box-shadow: var(--shadow-1) !important;
  border-radius: 12px !important;
  overflow: hidden;
}
.leaflet-bar a {
  background: var(--bg-raised) !important;
  color: var(--ink) !important;
  border-bottom-color: var(--line) !important;
  width: 40px !important;
  height: 40px !important;
  line-height: 40px !important;
  font-size: 18px !important;
}
.leaflet-bar a:hover { background: var(--bg-soft) !important; }

/* TOPBAR -------------------------------------------------------- */

#topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px calc(14px + env(safe-area-inset-top)) 18px;
  padding-top: calc(14px + env(safe-area-inset-top));
  background: linear-gradient(180deg, rgba(13,15,18,0.92) 0%, rgba(13,15,18,0.72) 70%, rgba(13,15,18,0) 100%);
  pointer-events: none;
}
#topbar > * { pointer-events: auto; }

.brand h1 {
  margin: 0;
  font-family: var(--display);
  font-weight: 600;
  font-variation-settings: "opsz" 48, "SOFT" 50;
  font-size: clamp(22px, 4.2vw, 30px);
  letter-spacing: -0.015em;
  line-height: 1;
}
.brand__sub {
  margin: 4px 0 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  font-weight: 500;
}

/* BOTTOM SHEET (mobile) / SIDE RAIL (desktop) ------------------- */

#sheet {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 600;
  background: linear-gradient(180deg, rgba(26,31,38,0.96), rgba(20,23,28,0.96));
  border-top: 1px solid var(--line-strong);
  border-radius: 20px 20px 0 0;
  box-shadow: var(--shadow-2);
  backdrop-filter: blur(16px);
  max-height: var(--sheet-peek);
  transition: max-height 420ms cubic-bezier(0.22, 1, 0.36, 1);
  overflow: hidden;
  padding-bottom: env(safe-area-inset-bottom);
}
#sheet.is-open { max-height: var(--sheet-full); }

#sheet-toggle {
  all: unset;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 10px 20px 14px;
  cursor: pointer;
}

.sheet__handle {
  grid-column: 1 / -1;
  justify-self: center;
  width: 44px;
  height: 4px;
  border-radius: 4px;
  background: var(--line-strong);
  margin-bottom: 4px;
}

.sheet__title {
  font-family: var(--display);
  font-weight: 600;
  font-variation-settings: "opsz" 24;
  font-size: 20px;
  letter-spacing: -0.01em;
}

.sheet__count {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
  font-weight: 500;
  font-feature-settings: "tnum" 1;
}

#sheet-body {
  padding: 4px 20px 20px;
  overflow-y: auto;
  max-height: calc(var(--sheet-full) - 64px);
}

.sheet__actions {
  display: flex;
  justify-content: flex-end;
  margin: 0 0 10px;
}

.ghost-btn {
  appearance: none;
  background: transparent;
  color: var(--ink-dim);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  font-family: var(--body);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}
.ghost-btn:hover {
  color: var(--ink);
  border-color: var(--line-strong);
}
.ghost-btn:active {
  background: rgba(255,255,255,0.04);
}

#line-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  --chip-bg: rgba(255,255,255,0.04);
  --chip-ink: var(--ink);
  --chip-border: var(--line);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px 8px 12px;
  background: var(--chip-bg);
  color: var(--chip-ink);
  border: 1px solid var(--chip-border);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  user-select: none;
  transition: transform 140ms ease, background 160ms ease, border-color 160ms ease, color 160ms ease;
  min-height: 36px;
  white-space: nowrap;
}
.chip:hover {
  border-color: var(--line-strong);
}
.chip:active { transform: scale(0.96); }
.chip input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.chip[data-on="true"] {
  --chip-bg: rgba(34,211,184,0.12);
  --chip-ink: var(--accent);
  --chip-border: rgba(34,211,184,0.45);
}
.chip__swatch {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 2px rgba(34,211,184,0.12);
  opacity: 0.6;
}
.chip[data-on="true"] .chip__swatch { opacity: 1; }

.sheet__footnote {
  margin: 18px 0 0;
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
}
.sheet__footnote a { color: var(--ink-dim); text-decoration: underline; text-underline-offset: 2px; }

/* TRAM MARKERS -------------------------------------------------- */

.tram-marker {
  position: relative;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent);
  color: #062a26;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: -0.02em;
  border: 2px solid rgba(13,15,18,0.85);
  box-shadow:
    0 0 0 1px rgba(34,211,184,0.35),
    0 4px 14px rgba(0,0,0,0.55),
    0 0 18px rgba(34,211,184,0.25);
  animation: markerIn 380ms cubic-bezier(0.2, 1.2, 0.3, 1);
  will-change: transform;
}
.tram-marker__arrow {
  position: absolute;
  top: -9px;
  left: 50%;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-bottom: 9px solid var(--accent);
  transform-origin: 50% 24px;
  pointer-events: none;
}
@keyframes markerIn {
  from { transform: scale(0.4); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

/* MOBILE-FIRST: everything above is mobile. Now add desktop. --- */

@media (min-width: 760px) {
  :root {
    --topbar-h: 92px;
  }
  body {
    display: grid;
    grid-template-columns: 340px 1fr;
  }
  #map {
    position: fixed;
    left: 340px;
    top: 0;
    bottom: 0;
    right: 0;
  }
  #topbar {
    position: fixed;
    top: 0;
    left: 340px;
    right: 0;
    background: linear-gradient(180deg, rgba(13,15,18,0.7) 0%, rgba(13,15,18,0) 100%);
    padding: 18px 24px;
  }
  /* Promote the bottom sheet into a left rail */
  #sheet {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: auto;
    width: 340px;
    max-height: none;
    background: linear-gradient(180deg, var(--bg-soft), var(--bg));
    border-radius: 0;
    border-top: none;
    border-right: 1px solid var(--line);
    box-shadow: none;
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }
  #sheet-toggle {
    cursor: default;
    padding: 28px 24px 16px;
    grid-template-columns: 1fr auto;
    align-items: baseline;
  }
  .sheet__handle { display: none; }
  .sheet__title {
    font-size: 36px;
    font-variation-settings: "opsz" 72;
    grid-column: 1 / -1;
  }
  .sheet__title::before {
    content: "Raitsikat ";
    display: block;
    font-family: var(--body);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 6px;
  }
  .sheet__count {
    grid-column: 1 / -1;
    justify-self: start;
    margin-top: 6px;
    font-size: 12px;
  }
  #sheet-body {
    padding: 18px 24px 24px;
    max-height: none;
    flex: 1;
  }
  /* Hide the mobile-style topbar brand on desktop — the rail carries it */
  .brand { display: none; }
  #topbar {
    justify-content: flex-end;
  }
}

@media (min-width: 1200px) {
  body { grid-template-columns: 380px 1fr; }
  #map { left: 380px; }
  #topbar { left: 380px; }
  #sheet { width: 380px; }
}

/* Reduced motion ------------------------------------------------ */

@media (prefers-reduced-motion: reduce) {
  .tram-marker { animation: none; }
  #sheet { transition: none; }
}