:root{
  --bg: #0b0f17;
  --panel: #0f1624;
  --panel-2: #121b2d;
  --text: #e8eefc;
  --muted: #a5b1cb;
  --line: #23304a;
  --accent: #6aa7ff;
  --accent-soft: rgba(106,167,255,.16);
  --accent-strong: rgba(106,167,255,.28);
  --accent-border: rgba(106,167,255,.4);
  --success: #4dd3a7;
  --warn: #f1b36b;
  --shadow: 0 18px 45px rgba(3,8,18,.55);
  --radius: 18px;
  --canvas-bg: rgba(8,12,20,.9);
}

body[data-theme="light"]{
  --bg: #f4f6fb;
  --panel: #ffffff;
  --panel-2: #eef2f8;
  --text: #1b2333;
  --muted: #51607a;
  --line: #d6deeb;
  --accent: #3972f4;
  --accent-soft: rgba(57,114,244,.14);
  --accent-strong: rgba(57,114,244,.2);
  --accent-border: rgba(57,114,244,.35);
  --success: #1ba37d;
  --warn: #d88a2c;
  --shadow: 0 12px 32px rgba(18,25,38,.14);
  --canvas-bg: rgba(255,255,255,.92);
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(106,167,255,.18), transparent 55%),
    radial-gradient(900px 600px at 95% 10%, rgba(77,211,167,.12), transparent 60%),
    var(--bg);
  color:var(--text);
}
body[data-theme="light"]{
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(57,114,244,.12), transparent 55%),
    radial-gradient(900px 600px at 95% 10%, rgba(77,211,167,.16), transparent 60%),
    var(--bg);
}

.page-shell{
  max-width: 1200px;
  margin: 0 auto;
  padding: 36px 24px 80px;
}

.hero{
  display:grid;
  gap:24px;
  grid-template-columns: minmax(0, 1.2fr) minmax(240px, .7fr);
  align-items:center;
  margin-bottom: 28px;
}
.hero__copy h1{
  margin: 10px 0 12px;
  font-size: 32px;
}
.eyebrow{
  text-transform: uppercase;
  letter-spacing: .2em;
  font-size: 11px;
  color: var(--muted);
}
.lead{
  color: var(--muted);
  line-height: 1.6;
}
.hero__chips{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin-top:16px;
}
.chip{
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--accent-border);
  background: var(--accent-soft);
  color: var(--text);
  font-size: 12px;
}
.hero__stats{
  display:grid;
  gap:14px;
  padding: 18px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,0));
  box-shadow: var(--shadow);
}
.stat{
  display:flex;
  justify-content:space-between;
  align-items:center;
  font-size: 13px;
}
.stat__label{ color: var(--muted); }
.stat__value{ font-weight: 600; }

.panel{
  border-radius: 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.panel--tabs{ padding: 18px; }

.tabs{
  display:flex;
  gap:10px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
  margin-bottom: 16px;
}
.tab{
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  padding: 8px 16px;
  border-radius: 12px;
  cursor:pointer;
  font-weight: 600;
}
.tab.active{
  background: var(--accent-soft);
  color: var(--text);
  border-color: var(--accent-border);
}
.tab-panel{ display:none; }
.tab-panel.active{ display:block; }

.explorer-layout{
  display:grid;
  gap:18px;
  grid-template-columns: 280px 1fr;
}

.control-panel{
  background: var(--panel-2);
  border-radius: 18px;
  padding: 16px;
  border: 1px solid var(--line);
  display:grid;
  gap:16px;
}
.control-section{
  display:grid;
  gap:10px;
}
.section-title{
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .18em;
  color: var(--muted);
}
.control{
  display:grid;
  gap:6px;
  font-size: 13px;
}
.control span{ color: var(--muted); font-size:12px; }
.control select,
.control input[type="text"],
.control input[type="search"],
.control input[type="number"]{
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
}
.control input[type="range"]{
  width: 100%;
  accent-color: var(--accent);
}
.control--toggle{
  grid-template-columns: auto 1fr;
  align-items:center;
  gap:10px;
}
.control--toggle input{
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.dataset-preview{
  display:grid;
  grid-template-columns: 80px 1fr;
  gap:10px;
  padding: 10px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
}
.dataset-preview img{
  width: 100%;
  height: 72px;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--line);
}
.dataset-preview__title{
  font-weight: 600;
  font-size: 13px;
}
.dataset-preview__note{
  font-size: 12px;
  color: var(--muted);
  line-height: 1.4;
  margin-top: 4px;
}

.button-row{
  display:flex;
  gap:8px;
  flex-wrap:wrap;
}
.btn{
  border: 1px solid var(--accent-border);
  background: var(--accent-soft);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 10px;
  cursor:pointer;
  font-weight: 600;
}
.btn--ghost{
  background: transparent;
  border-color: var(--line);
  color: var(--muted);
}
.btn:hover{ box-shadow: 0 0 0 4px var(--accent-soft); }

.hint{
  font-size: 12px;
  color: var(--muted);
  line-height: 1.5;
  margin:0;
}

.file-list{
  display:grid;
  gap:8px;
}
.file-item{
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  font-size: 12px;
}
.file-item strong{ display:block; font-size: 13px; }
.file-item span{ color: var(--muted); }

.viewer{
  display:grid;
  gap:14px;
  align-content:start;
}
.viewer-header{
  display:flex;
  justify-content:space-between;
  align-items:center;
}
.viewer-title{ font-size: 18px; font-weight: 700; }
.viewer-subtitle{ color: var(--muted); font-size: 13px; }
.viewer-pill{
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  font-size: 12px;
}

.viewer-body{
  display:grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap:16px;
  align-items:stretch;
}
.canvas-shell{
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--canvas-bg);
  min-height: 440px;
}
#viewerCanvas{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  display:block;
}
.canvas-overlay{
  position:absolute;
  inset:0;
  pointer-events:none;
}
.readout{
  position:absolute;
  left:16px;
  top:16px;
  max-width: 280px;
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(15,22,36,.78);
  border: 1px solid var(--line);
  color: var(--text);
  font-size: 12px;
  box-shadow: var(--shadow);
}
body[data-theme="light"] .readout{
  background: rgba(255,255,255,.85);
}
.readout__title{
  font-weight: 600;
  margin-bottom: 6px;
}
.readout__meta{
  margin-top: 8px;
  color: var(--muted);
  line-height: 1.5;
}
.scale{
  position:absolute;
  right:18px;
  bottom:16px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--panel);
  border: 1px solid var(--line);
  font-size: 11px;
  color: var(--muted);
}

.side-stack{
  display:grid;
  gap:14px;
}
.legend,
.map-card{
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  padding: 14px;
}
.legend__header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom: 10px;
}
.legend__title{ font-weight: 700; font-size: 14px; }
.legend__subtitle{ font-size: 12px; color: var(--muted); }
.legend__grid{
  display:grid;
  gap:8px;
  font-size: 12px;
}
.legend-row{
  display:flex;
  justify-content:space-between;
  padding: 6px 8px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
}
.legend-row span{ color: var(--muted); }

.map-card__header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom: 10px;
}
.pill{
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
}
.mini-map{
  height: 200px;
  border-radius: 12px;
  overflow: hidden;
  background: rgba(12,18,30,0.6);
}
body[data-theme="light"] .mini-map{
  background: rgba(230,236,247,0.9);
}

.workflow{
  display:grid;
  gap:20px;
  line-height: 1.6;
  color: var(--muted);
}
.workflow h2{
  color: var(--text);
  margin: 0 0 6px;
}
.workflow section{
  padding: 14px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--panel-2);
}

@media (max-width: 1024px){
  .hero{ grid-template-columns: 1fr; }
  .explorer-layout{ grid-template-columns: 1fr; }
  .viewer-body{ grid-template-columns: 1fr; }
}

@media (max-width: 720px){
  .page-shell{ padding: 24px 16px 60px; }
  .hero__stats{ grid-template-columns: 1fr; }
}