/* =============================
   SPb Transit Analytics — styles
   ============================= */

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

/* ── Design tokens ─────────────────────── */
:root {
  --bg:          #0b0f1a;
  --bg-panel:    #111827;
  --bg-card:     #151d2e;
  --bg-hover:    #1a2540;
  --border:      rgba(99,120,180,.18);
  --border-hi:   rgba(99,120,180,.38);

  --accent:      #5b8af0;
  --accent-glow: rgba(91,138,240,.25);
  --accent2:     #7c55e8;
  --accent3:     #38c9a4;
  --accent4:     #f0a050;
  --danger:      #e05555;

  --text:        #e4eaf8;
  --text-dim:    #7a8aaa;
  --text-muted:  #4a5570;

  --speed-low:   #e05555;
  --speed-mid:   #f0a050;
  --speed-hi:    #38c9a4;

  --radius:      10px;
  --radius-lg:   16px;
  --shadow:      0 4px 24px rgba(0,0,0,.45);
  --shadow-card: 0 2px 12px rgba(0,0,0,.35);

  --font:        'Inter', sans-serif;
  --mono:        'JetBrains Mono', monospace;

  /* Transport type colours */
  --bus-color:        #5b8af0;
  --tram-color:       #e05555;
  --trolleybus-color: #38c9a4;
  --metro-color:      #a855f7;
  --other-color:      #f0a050;
}

/* ── Reset ─────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { height: 100%; font-size: 15px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100%;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; }
button { font-family: var(--font); cursor: pointer; border: none; outline: none; }
input, select { font-family: var(--font); outline: none; }

/* ── Scrollbar ─────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-panel); }
::-webkit-scrollbar-thumb { background: var(--border-hi); border-radius: 4px; }

/* ── Layout ────────────────────────────── */
.app { display: flex; flex-direction: column; min-height: 100vh; }

/* ── Header ────────────────────────────── */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11,15,26,.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 28px;
  display: flex; align-items: center; gap: 24px;
  height: 58px;
}
.header-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.05rem; font-weight: 700;
  letter-spacing: -.3px; color: var(--text);
}
.header-logo svg { color: var(--accent); }
.header-badge {
  font-size: .72rem; padding: 2px 8px; border-radius: 20px;
  background: var(--accent-glow); color: var(--accent);
  border: 1px solid rgba(91,138,240,.3);
  font-weight: 500;
}
.header-spacer { flex: 1; }
.header-meta { font-size: .78rem; color: var(--text-dim); }

/* ── Nav tabs ──────────────────────────── */
.nav {
  display: flex; gap: 4px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  padding: 0 28px;
  overflow-x: auto;
}
.nav::-webkit-scrollbar { height: 0; }
.nav-btn {
  display: flex; align-items: center; gap: 7px;
  padding: 12px 16px; font-size: .85rem; font-weight: 500;
  color: var(--text-dim);
  background: transparent;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color .2s, border-color .2s;
}
.nav-btn:hover { color: var(--text); }
.nav-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ── Main content ──────────────────────── */
.main { flex: 1; padding: 28px; display: flex; flex-direction: column; gap: 24px; }
.tab-panel { display: none; flex-direction: column; gap: 24px; }
.tab-panel.active { display: flex; }
/* Routes: tighter gap */
#panel-routes { gap: 12px; }
/* Map: break out of padding, edge-to-edge */
#panel-map {
  gap: 0;
  margin: -28px;
}

/* ── KPI cards ─────────────────────────── */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 10px;
}
.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  position: relative; overflow: hidden;
  transition: border-color .2s, transform .2s;
}
.kpi-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
}
.kpi-card:hover { border-color: var(--border-hi); transform: translateY(-2px); }
.kpi-label { font-size: .7rem; color: var(--text-dim); font-weight: 500; text-transform: uppercase; letter-spacing: .5px; margin-bottom: 6px; }
.kpi-value { font-size: 1.55rem; font-weight: 700; line-height: 1; color: var(--text); }
.kpi-unit  { font-size: .72rem; color: var(--text-dim); margin-top: 3px; }
.kpi-card.accent .kpi-value { color: var(--accent3); }
.kpi-card.accent2 .kpi-value { color: var(--accent); }

/* ── Section headers ───────────────────── */
.section-header {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 2px;
}
.section-title { font-size: .9rem; font-weight: 600; color: var(--text); }
.section-sub { font-size: .75rem; color: var(--text-dim); }

/* ── Panel / card ──────────────────────── */
.panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 12px 16px;
}
.panel-title { font-size: .78rem; font-weight: 600; color: var(--text-dim); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 12px; }

/* ── Grid layouts ──────────────────────── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; }
@media (max-width: 900px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

/* ── Filters bar ───────────────────────── */
.filters-bar {
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 10px 16px;
}
.filter-group { display: flex; align-items: center; gap: 8px; }
.filter-label { font-size: .78rem; color: var(--text-dim); white-space: nowrap; }
.filter-select, .filter-input {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: .82rem;
  padding: 6px 10px;
  transition: border-color .2s;
}
.filter-select:hover, .filter-input:hover { border-color: var(--border-hi); }
.filter-select:focus, .filter-input:focus { border-color: var(--accent); }
.filter-input { min-width: 200px; }
.btn-reset {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-dim);
  font-size: .78rem;
  padding: 6px 12px;
  transition: all .2s;
}
.btn-reset:hover { border-color: var(--border-hi); color: var(--text); }

/* ── Custom Multi-Select with Checkboxes ─ */
.multi-select { position: relative; }
.multi-select summary { 
  background: var(--bg-panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 6px 10px; font-size: .82rem; cursor: pointer; list-style: none; user-select: none;
  min-width: 140px; color: var(--text); display: flex; align-items: center; justify-content: space-between;
}
.multi-select summary::after { content: '▼'; font-size: 8px; margin-left: 8px; opacity: 0.6; }
.multi-select summary::-webkit-details-marker { display: none; }
.multi-select[open] summary { border-color: var(--accent); }
.multi-select-options {
  position: absolute; top: 100%; left: 0; z-index: 100;
  background: var(--bg-panel); border: 1px solid var(--border); border-radius: var(--radius);
  margin-top: 4px; padding: 6px; box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  display: flex; flex-direction: column; gap: 4px;
  max-height: 250px; overflow-y: auto; min-width: 100%;
}
.multi-select-options label {
  display: flex; align-items: center; gap: 6px; font-size: .8rem; padding: 4px 8px; cursor: pointer;
  white-space: nowrap; color: var(--text-dim);
}
.multi-select-options label:hover { background: var(--bg-hover); color: var(--text); border-radius: 4px; }
.multi-select-options input[type="checkbox"] { cursor: pointer; accent-color: var(--accent); }

/* ── Routes table ──────────────────────── */
.table-wrap { overflow: auto; border-radius: var(--radius); }
.data-table {
  width: 100%; border-collapse: collapse;
  font-size: .82rem;
}
.data-table th {
  background: var(--bg-panel);
  color: var(--text-dim); font-weight: 600;
  text-align: left; white-space: nowrap;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  cursor: pointer; user-select: none;
  position: sticky; top: 0; z-index: 1;
}
.data-table th:hover { color: var(--text); }
.data-table th .sort-icon { font-size: .7rem; margin-left: 4px; opacity: .5; }
.data-table th.sorted .sort-icon { opacity: 1; color: var(--accent); }
.data-table td {
  padding: 9px 14px;
  border-bottom: 1px solid rgba(99,120,180,.08);
  white-space: nowrap;
}
.data-table tr:hover td { background: var(--bg-hover); }
.data-table tr:last-child td { border-bottom: none; }

.speed-badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-weight: 600; font-family: var(--mono);
  font-size: .8rem;
}
.speed-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }

.type-pill {
  display: inline-block;
  font-size: .7rem; font-weight: 600;
  padding: 2px 8px; border-radius: 20px;
  text-transform: uppercase; letter-spacing: .3px;
}
.type-bus        { background: rgba(91,138,240,.15);  color: var(--bus-color); }
.type-tram       { background: rgba(224,85,85,.15);   color: var(--tram-color); }
.type-trolleybus { background: rgba(56,201,164,.15);  color: var(--trolleybus-color); }
.type-metro      { background: rgba(168,85,247,.15);  color: var(--metro-color); }
.type-other      { background: rgba(240,160,80,.15);  color: var(--other-color); }

.district-tags { display: flex; gap: 4px; flex-wrap: wrap; max-width: 280px; }
.district-tag {
  font-size: .68rem; padding: 2px 6px; border-radius: 4px;
  background: rgba(91,138,240,.1); color: var(--accent);
  border: 1px solid rgba(91,138,240,.2);
}

.table-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; font-size: .78rem; color: var(--text-dim);
  border-top: 1px solid var(--border);
}
.pagination { display: flex; gap: 4px; }
.page-btn {
  background: var(--bg-panel); border: 1px solid var(--border);
  border-radius: 6px; color: var(--text-dim);
  font-size: .78rem; padding: 4px 10px;
  transition: all .2s;
}
.page-btn:hover { border-color: var(--border-hi); color: var(--text); }
.page-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ── Bar charts ────────────────────────── */
.bar-chart-container { position: relative; }
canvas { display: block; }

/* ── Comparison grid ───────────────────── */
.comparison-row {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(99,120,180,.08);
}
.comparison-row:last-child { border-bottom: none; }
.cmp-label { width: 180px; font-size: .82rem; color: var(--text-dim); flex-shrink: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cmp-bar-wrap { flex: 1; height: 22px; background: rgba(99,120,180,.08); border-radius: 4px; overflow: hidden; position: relative; }
.cmp-bar { height: 100%; border-radius: 4px; transition: width .6s cubic-bezier(.4,0,.2,1); position: relative; }
.cmp-bar-iqr {
  position: absolute; top: 4px; bottom: 4px;
  background: rgba(255,255,255,.12);
  border-radius: 2px;
}
.cmp-value { width: 70px; text-align: right; font-size: .82rem; font-weight: 600; font-family: var(--mono); color: var(--text); flex-shrink: 0; }
.cmp-sub { width: 100px; font-size: .72rem; color: var(--text-dim); flex-shrink: 0; }

/* ── Speed colour legend ───────────────── */
.speed-legend {
  display: flex; align-items: center; gap: 8px;
  font-size: .75rem; color: var(--text-dim);
}
.speed-grad {
  width: 120px; height: 10px; border-radius: 5px;
  background: linear-gradient(90deg, var(--speed-low), var(--speed-mid), var(--speed-hi));
}
.speed-legend-val { font-family: var(--mono); font-size: .7rem; color: var(--text-dim); }

/* ── Map container ─────────────────────── */
/* 58px header + 48px nav + 44px map-controls + 40px map-legend */
#map {
  width: 100%;
  height: calc(100vh - 58px - 48px - 44px - 40px);
  min-height: 480px;
  border-radius: 0;
  overflow: hidden;
}
.map-panel { display: flex; flex-direction: column; gap: 0; }
.map-controls {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  padding: 12px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  border-bottom: none;
}
.map-legend {
  display: flex; flex-wrap: wrap; gap: 16px; align-items: center;
  padding: 8px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  border-top: none;
  font-size: .75rem; color: var(--text-dim);
}
.legend-item { display: flex; align-items: center; gap: 6px; }
.legend-line { width: 24px; height: 3px; border-radius: 2px; }

/* ── Loading / empty states ────────────── */
.loading-overlay {
  position: fixed; inset: 0; z-index: 999;
  background: var(--bg);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 20px;
}
.loading-overlay.hidden { display: none; }
.spinner {
  width: 44px; height: 44px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { font-size: .9rem; color: var(--text-dim); }
.loading-sub  { font-size: .78rem; color: var(--text-muted); margin-top: -12px; }

.empty-state {
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  padding: 48px; color: var(--text-muted); font-size: .85rem;
}

/* ── Stat row ──────────────────────────── */
.stat-row { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.stat-chip {
  font-size: .72rem; padding: 2px 8px; border-radius: 20px;
  background: rgba(99,120,180,.1); color: var(--text-dim);
  border: 1px solid var(--border); font-family: var(--mono);
}
.stat-chip.hi { background: rgba(56,201,164,.1); color: var(--accent3); border-color: rgba(56,201,164,.2); }
.stat-chip.lo { background: rgba(224,85,85,.1); color: var(--danger); border-color: rgba(224,85,85,.2); }

/* ── Distribution histogram ────────────── */
.dist-panel { display: flex; flex-direction: column; gap: 12px; }

/* ── Tooltip ───────────────────────────── */
.tooltip {
  position: fixed; z-index: 500; pointer-events: none;
  background: var(--bg-panel); border: 1px solid var(--border-hi);
  border-radius: 8px; padding: 10px 14px;
  font-size: .78rem; color: var(--text);
  box-shadow: var(--shadow);
  max-width: 220px;
  opacity: 0; transition: opacity .15s;
}
.tooltip.visible { opacity: 1; }
.tooltip-title { font-weight: 600; margin-bottom: 4px; }
.tooltip-row { display: flex; justify-content: space-between; gap: 12px; color: var(--text-dim); }
.tooltip-row span:last-child { color: var(--text); font-family: var(--mono); }

/* ── Animations ────────────────────────── */
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.tab-panel.active { animation: fadeIn .25s ease; }

/* ── Compare page ──────────────────────── */
.compare-controls {
  display: flex; flex-wrap: wrap; gap: 16px; align-items: flex-start;
}
.compare-sentence {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  font-size: .95rem; font-weight: 500; color: var(--text);
}
.compare-sentence .cmp-select {
  background: var(--bg-panel); border: 1px solid var(--accent);
  border-radius: var(--radius); color: var(--accent);
  font-size: .9rem; font-weight: 600; padding: 5px 10px;
  cursor: pointer; transition: border-color .2s;
}
.compare-sentence .cmp-select:focus { outline: none; border-color: var(--accent2); }
.compare-divider {
  width: 100%; height: 1px; background: var(--border); margin: 4px 0;
}
.compare-filters-row {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  width: 100%;
}
.cmp-filter-label { font-size: .75rem; color: var(--text-dim); white-space: nowrap; }
.cmp-result-header {
  display: flex; align-items: center; gap: 16px; margin-bottom: 12px; flex-wrap: wrap;
}
.cmp-result-title { font-size: .88rem; font-weight: 600; color: var(--text); flex: 1; }
.cmp-chip {
  font-size: .72rem; padding: 3px 10px; border-radius: 20px; border: 1px solid var(--border);
  color: var(--text-dim); background: var(--bg-panel);
}
.cmp-chip.active { border-color: var(--accent); color: var(--accent); background: var(--accent-glow); }
.cmp-empty {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  padding: 40px; color: var(--text-muted); font-size: .85rem; text-align: center;
}
.cmp-empty svg { opacity: .3; }
.rank-badge {
  display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px; border-radius: 50%;
  font-size: .7rem; font-weight: 700;
}
.rank-1 { background: rgba(255,215,0,.2); color: #ffd700; border: 1px solid rgba(255,215,0,.4); }
.rank-2 { background: rgba(192,192,192,.2); color: #c0c0c0; border: 1px solid rgba(192,192,192,.4); }
.rank-3 { background: rgba(205,127,50,.2); color: #cd7f32; border: 1px solid rgba(205,127,50,.4); }
.rank-n { background: rgba(99,120,180,.1); color: var(--text-muted); border: 1px solid var(--border); }

/* ── Responsive ────────────────────────── */
@media (max-width: 768px) {
  .header { padding: 0 16px; }
  .nav    { padding: 0 16px; }
  .main   { padding: 16px; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .cmp-label { width: 120px; }
}

.lang-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: bold;
  cursor: pointer;
  margin-right: 10px;
}
.lang-toggle:hover {
  border-color: var(--accent);
}