:root {
    --bg: #f5efe4;
    --bg2: #ece4d3;
    --bg3: #e2d8c1;
    --ink: #1b2237;
    --ink-soft: #4d5570;
    --rule: rgba(27,34,55,0.18);
    --accent: #c8553d;
    --acc-cam: #2e5e7e;
    --acc-bri: #6b8e23;
    --acc-tun: #6d4c7d;
    --accent-4: #d4a017;
  }
  * { box-sizing: border-box; }
  html, body { margin: 0; padding: 0; height: 100%; }
  body {
    background: var(--bg);
    color: var(--ink);
    font-family: 'Pretendard', system-ui, sans-serif;
    font-feature-settings: 'tnum' 1;
    -webkit-font-smoothing: antialiased;
    overflow: hidden;
  }

  .app {
    display: grid;
    grid-template-rows: auto 1fr;
    grid-template-columns: 360px 1fr;
    grid-template-areas:
      "head head"
      "side map";
    height: 100vh;
  }

  /* HEADER */
  header {
    grid-area: head;
    padding: 14px 22px;
    border-bottom: 1px solid var(--ink);
    display: flex; align-items: baseline; gap: 16px;
    background: var(--bg);
    z-index: 500;
    flex-wrap: wrap;
  }
  header .badge {
    font-size: 11px; letter-spacing: 0.22em; text-transform: uppercase;
    color: var(--ink-soft);
  }
  header h1 {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin: 0;
  }
  header .home-link {
    margin-left: auto;
    font-size: 13px;
    color: var(--ink-soft);
    text-decoration: none;
  }
  header .home-link:hover { color: var(--accent); }

  /* SIDEBAR */
  .side {
    grid-area: side;
    background: var(--bg);
    border-right: 1px solid var(--ink);
    overflow-y: auto;
    padding: 18px 18px 24px;
  }

  .section-title {
    font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
    color: var(--ink-soft); font-weight: 700;
    margin: 24px 0 10px;
  }
  .section-title:first-child { margin-top: 0; }

  /* Layer toggles */
  .layer {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--rule);
    cursor: pointer;
  }
  .layer-row {
    display: flex; align-items: center; gap: 10px;
  }
  .layer-dot {
    width: 12px; height: 12px; border-radius: 50%;
    flex-shrink: 0;
  }
  .layer.l-acc .layer-dot { background: var(--accent); }
  .layer.l-cam .layer-dot { background: var(--acc-cam); }
  .layer.l-bri .layer-dot { background: var(--acc-bri); }
  .layer.l-tun .layer-dot { background: var(--acc-tun); }
  .layer-name { flex: 1; font-weight: 600; font-size: 14px; }
  .layer-count { font-size: 12px; color: var(--ink-soft); font-variant-numeric: tabular-nums; }
  .layer-toggle {
    appearance: none;
    width: 32px; height: 18px;
    background: var(--bg3);
    border: 1px solid var(--ink);
    border-radius: 999px;
    position: relative;
    cursor: pointer;
    transition: background .15s;
  }
  .layer-toggle::after {
    content: "";
    position: absolute;
    top: 2px; left: 2px;
    width: 12px; height: 12px;
    background: var(--ink);
    border-radius: 50%;
    transition: transform .15s;
  }
  .layer-toggle:checked { background: var(--ink); }
  .layer-toggle:checked::after { background: var(--bg); transform: translateX(14px); }

  .layer-detail {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px dashed var(--rule);
    display: none;
  }
  .layer.open .layer-detail { display: block; }

  .facet-label {
    font-size: 11px; color: var(--ink-soft); margin-bottom: 6px; font-weight: 600;
  }
  .chips { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 10px; }
  .chip {
    background: transparent;
    border: 1px solid rgba(27,34,55,0.3);
    border-radius: 999px;
    padding: 3px 9px;
    font: inherit; font-size: 11px;
    color: var(--ink);
    cursor: pointer;
    font-variant-numeric: tabular-nums;
  }
  .chip:hover { border-color: var(--ink); }
  .chip.active { background: var(--ink); color: var(--bg); border-color: var(--ink); }
  .chip .ct { opacity: 0.6; margin-left: 3px; font-size: 10px; }

  .check-row {
    display: flex; align-items: center; gap: 8px;
    padding: 4px 0; font-size: 12px;
    cursor: pointer;
  }
  .check-row input { accent-color: var(--ink); }

  /* Stats */
  .stat-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 4px 12px;
    margin: 14px 0 8px;
  }
  .stat {
    padding: 6px 0;
    border-top: 1px solid var(--rule);
  }
  .stat .v { font-size: 18px; font-weight: 700; line-height: 1; font-variant-numeric: tabular-nums; }
  .stat .l { font-size: 11px; color: var(--ink-soft); margin-top: 4px; }

  #side-chart, #stat-chart { width: 100%; height: 140px; }
  #stat-chart { height: 180px; }

  /* MAP */
  .map-wrap {
    grid-area: map;
    position: relative;
    overflow: hidden;
  }
  #map { position: absolute; inset: 0; background: var(--bg); }
  .map-overlay {
    position: absolute; bottom: 14px; right: 14px;
    background: var(--bg);
    border: 1px solid var(--ink);
    padding: 8px 12px;
    font-size: 11px;
    color: var(--ink-soft);
    z-index: 400;
    max-width: 220px;
  }
  .leaflet-container { background: var(--bg2); font-family: 'Pretendard', sans-serif; }
  .leaflet-popup-content-wrapper {
    background: var(--ink); color: var(--bg);
    border-radius: 4px;
    box-shadow: 0 4px 18px rgba(0,0,0,0.18);
  }
  .leaflet-popup-content { margin: 12px 14px; font-size: 13px; line-height: 1.5; }
  .leaflet-popup-tip { background: var(--ink); }
  .leaflet-popup-close-button { color: var(--bg) !important; font-size: 18px !important; }
  .leaflet-popup-content b { color: #fff; font-weight: 600; }
  .leaflet-popup-content .meta { color: rgba(245,239,228,0.7); font-size: 11px; margin-top: 4px; }
  .sigungu-tooltip {
    background: var(--ink);
    color: var(--bg);
    border: none;
    box-shadow: 0 3px 12px rgba(0,0,0,0.18);
    padding: 8px 12px;
    font-size: 12px;
    line-height: 1.45;
  }
  .sigungu-tooltip::before { display: none; }

  /* Source footer */
  .src-toggle {
    position: absolute;
    bottom: 14px; left: 14px;
    background: var(--bg);
    border: 1px solid var(--ink);
    padding: 8px 14px;
    font: inherit; font-size: 12px;
    color: var(--ink);
    cursor: pointer;
    z-index: 400;
  }
  .src-toggle:hover { background: var(--ink); color: var(--bg); }
  .src-panel {
    position: fixed; left: 0; right: 0; bottom: 0;
    background: var(--bg);
    border-top: 1px solid var(--ink);
    padding: 24px 28px;
    transform: translateY(100%);
    transition: transform .25s ease;
    z-index: 600;
    max-height: 70vh;
    overflow-y: auto;
  }
  .src-panel.open { transform: translateY(0); }
  .src-panel h3 { margin: 0 0 16px; font-size: 18px; }
  .src-panel .src-close {
    position: absolute; top: 18px; right: 22px;
    background: transparent; border: none; cursor: pointer;
    font-size: 22px; color: var(--ink);
  }
  .src-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 14px 28px; }
  .src-item { padding: 10px 0; border-top: 1px solid var(--rule); }
  .src-item a { color: var(--ink); font-weight: 600; text-decoration: underline; text-decoration-color: rgba(27,34,55,0.3); }
  .src-item a:hover { text-decoration-color: var(--accent); color: var(--accent); }
  .src-item .src-meta { font-size: 12px; color: var(--ink-soft); margin-top: 3px; }
  .src-item .src-note { font-size: 12px; color: var(--ink-soft); margin-top: 6px; line-height: 1.45; }

  /* Timeline */
  .timeline {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    width: min(680px, calc(100% - 60px));
    background: var(--bg);
    border: 1px solid var(--ink);
    padding: 12px 16px 14px;
    display: flex;
    align-items: center;
    gap: 14px;
    z-index: 400;
    box-shadow: 0 6px 20px rgba(0,0,0,0.06);
  }
  .tl-play {
    background: var(--ink);
    color: var(--bg);
    border: none;
    width: 34px; height: 34px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 12px;
    flex-shrink: 0;
    transition: background .15s;
  }
  .tl-play:hover { background: var(--accent); }
  .tl-play.replay::before { content: "↻"; font-size: 16px; }
  .tl-year {
    font-size: 22px;
    font-weight: 700;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
    line-height: 1;
    min-width: 56px;
    flex-shrink: 0;
  }
  .tl-year .label { font-size: 10px; color: var(--ink-soft); display: block; font-weight: 500; letter-spacing: 0.08em; margin-bottom: 2px; }
  .tl-track {
    flex: 1;
    position: relative;
  }
  .tl-track input[type=range] {
    width: 100%;
    accent-color: var(--ink);
    height: 14px;
    cursor: pointer;
  }
  .tl-labels {
    display: flex; justify-content: space-between;
    font-size: 9px; color: var(--ink-soft);
    margin-top: -2px;
    font-variant-numeric: tabular-nums;
  }
  .tl-mode {
    display: flex;
    gap: 0;
    border: 1px solid var(--ink);
    border-radius: 999px;
    overflow: hidden;
    flex-shrink: 0;
  }
  .tl-mode button {
    background: transparent;
    border: none;
    padding: 5px 10px;
    font: inherit;
    font-size: 11px;
    cursor: pointer;
    color: var(--ink);
  }
  .tl-mode button.active {
    background: var(--ink);
    color: var(--bg);
  }
  .tl-counter {
    font-size: 11px;
    color: var(--ink-soft);
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
    min-width: 56px;
    text-align: right;
    flex-shrink: 0;
  }
  .tl-counter b { color: var(--ink); font-weight: 700; }
  @media (max-width: 820px) {
    .timeline {
      width: calc(100% - 24px); bottom: 64px;
      flex-wrap: wrap;
      padding: 10px 12px;
      gap: 10px;
    }
    .tl-mode { order: 4; }
    .tl-track { order: 5; flex-basis: 100%; }
  }

  /* Loading */
  .loading-overlay {
    position: absolute; inset: 0;
    background: rgba(245,239,228,0.85);
    display: flex; align-items: center; justify-content: center;
    z-index: 500;
    font-size: 13px; color: var(--ink-soft);
  }
  .spin {
    display: inline-block;
    width: 14px; height: 14px;
    margin-right: 10px;
    border: 2px solid var(--ink-soft);
    border-top-color: transparent;
    border-radius: 50%;
    vertical-align: middle;
    animation: spin .9s linear infinite;
  }
  @keyframes spin { to { transform: rotate(360deg); } }

  /* Responsive */
  @media (max-width: 820px) {
    body { overflow: auto; }
    .app {
      grid-template-rows: auto auto 1fr;
      grid-template-columns: 1fr;
      grid-template-areas: "head" "map" "side";
      height: auto;
    }
    .map-wrap { height: 56vh; }
    .side { border-right: none; border-top: 1px solid var(--ink); max-height: none; }
  }