:root {
  --bg: #fbfbfd;
  --ink: #15181d;
  --muted: #5d6573;
  --line: #e7e8ee;
  --accent: #1f7a8c;
  --accent-2: #6ee7ff;
  --panel: #0d1117;
  --panel-2: #121922;
  --radius: 16px;
  --maxw: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 760px; }
.center { text-align: center; }
sup { font-size: 0.62em; }

/* ---------- hero ---------- */
.hero {
  padding: 72px 0 40px;
  background:
    radial-gradient(900px 360px at 80% -10%, rgba(110,231,255,0.18), transparent 60%),
    radial-gradient(700px 320px at 8% 0%, rgba(31,122,140,0.14), transparent 55%),
    linear-gradient(180deg, #ffffff, var(--bg));
  border-bottom: 1px solid var(--line);
  text-align: center;
}
.venue {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  margin: 0 0 14px;
}
.hero h1 {
  font-family: "Newsreader", Georgia, serif;
  font-weight: 500;
  font-size: clamp(28px, 4.4vw, 46px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 auto;
  max-width: 16ch;
}
.subtitle {
  font-weight: 400;
  font-size: clamp(15px, 1.9vw, 20px);
  color: var(--muted);
  margin: 14px auto 26px;
  max-width: 40ch;
}
.authors {
  list-style: none; display: flex; flex-wrap: wrap; justify-content: center;
  gap: 6px 20px; padding: 0; margin: 0 0 8px; font-size: 16px; font-weight: 500;
}
.authors sup { color: var(--accent); }
.affil {
  list-style: none; display: flex; flex-wrap: wrap; justify-content: center;
  gap: 4px 18px; padding: 0; margin: 0; color: var(--muted); font-size: 13.5px;
}
.affil sup { color: var(--accent); }

.links { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 30px; }
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 10px 18px; border-radius: 999px;
  background: var(--panel); color: #fff; text-decoration: none;
  font-weight: 600; font-size: 14.5px; border: 1px solid #20262f;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(13,17,23,0.22); }
.btn svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.btn.ghost {
  background: #fff; color: var(--muted); border: 1px dashed #c7ccd6; cursor: default;
}
.btn.ghost:hover { transform: none; box-shadow: none; }

/* ---------- bands ---------- */
.band { padding: 64px 0; border-bottom: 1px solid var(--line); }
.section-title {
  font-family: "Newsreader", serif; font-weight: 500;
  font-size: clamp(22px, 3vw, 30px); margin: 0 0 12px; letter-spacing: -0.01em;
  text-align: center;
}
.section-lead {
  color: var(--muted); max-width: 60ch; margin: 0 auto 30px;
  font-size: 16px; text-align: center;
}

.tldr { background: #fff; }
.tldr p { font-size: clamp(16px, 1.9vw, 19px); }
.tldr strong { color: var(--accent); font-weight: 600; }
.stats {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 32px;
}
.stats div {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 18px; text-align: center;
}
.stats b { display: block; font-size: 28px; font-weight: 800; letter-spacing: -0.02em; color: var(--ink); }
.stats span { display: block; font-size: 13px; color: var(--muted); margin-top: 6px; }

.pipeline {
  margin: 0 auto; max-width: 560px; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); background: #fff;
  box-shadow: 0 20px 50px -28px rgba(20,30,50,0.35);
}
.pipeline img { display: block; width: 100%; height: auto; }

/* ---------- viewer ---------- */
.viewer-band { background: linear-gradient(180deg, #f4f6f9, #fbfbfd); }
.viewer {
  display: grid; grid-template-columns: 150px 1fr; gap: 20px;
  background: var(--panel); border-radius: 20px; padding: 18px;
  border: 1px solid #1d242e; box-shadow: 0 30px 70px -40px rgba(0,0,0,0.6);
}
.cases {
  display: flex; flex-direction: column; gap: 10px; max-height: 620px;
  overflow-y: auto; padding-right: 4px;
}
.cases::-webkit-scrollbar { width: 6px; }
.cases::-webkit-scrollbar-thumb { background: #2a323d; border-radius: 6px; }
.case {
  display: flex; flex-direction: column; gap: 4px; padding: 6px;
  background: var(--panel-2); border: 1px solid transparent; border-radius: 12px;
  cursor: pointer; color: #aeb6c2; font-size: 11.5px; text-align: left;
  transition: border-color .15s, transform .15s;
}
.case:hover { transform: translateY(-1px); border-color: #2c3a44; }
.case.active { border-color: var(--accent-2); color: #eaf6ff; }
.case img { width: 100%; border-radius: 8px; display: block; aspect-ratio: 1; object-fit: cover; }

.stage { position: relative; min-width: 0; }
.panes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.panes.is-grid {
  grid-template-columns: repeat(2, 1fr);
  gap: 14px; max-width: 560px; margin: 0 auto;
}
.view { display: flex; flex-direction: column; gap: 8px; }
.view .tag {
  display: flex; align-items: center; gap: 7px;
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: #7f8a98; font-weight: 600;
}
.view .tag-swatch { width: 9px; height: 9px; border-radius: 3px; box-shadow: 0 0 6px currentColor; }

/* layout toggle + plane bar */
.layoutbar {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 12px; margin-bottom: 16px;
}
.seg {
  display: inline-flex; gap: 3px; padding: 3px;
  background: var(--panel-2); border: 1px solid #232b35; border-radius: 10px;
}
.seg-btn {
  background: none; border: none; cursor: pointer;
  color: #8d97a4; font-weight: 600; font-size: 12.5px;
  padding: 6px 14px; border-radius: 8px; transition: background .15s, color .15s;
}
.seg-btn:hover { color: #cfd6df; }
.seg-btn.on { background: var(--accent); color: #fff; }
.planebar { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.planebar[hidden] { display: none; }
.plane-select {
  display: inline-flex; gap: 3px; padding: 3px;
  background: var(--panel-2); border: 1px solid #232b35; border-radius: 10px;
}
.plane-select .pl {
  background: none; border: none; cursor: pointer;
  color: #8d97a4; font-weight: 600; font-size: 12px;
  padding: 5px 11px; border-radius: 7px; transition: background .15s, color .15s;
}
.plane-select .pl:hover { color: #cfd6df; }
.plane-select .pl.on { background: #2a3942; color: #eaf6ff; }
.grid-slice-wrap {
  display: flex; align-items: center; gap: 9px;
  font-size: 12px; font-weight: 600; color: #8d97a4;
}
.grid-slice { width: 150px; }
.canvas-stack {
  position: relative; width: 100%; aspect-ratio: 1; border-radius: 12px;
  overflow: hidden; background: #000; border: 1px solid #20272f;
}
.canvas-stack canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.canvas-stack .img { image-rendering: auto; }
.canvas-stack .cross { cursor: crosshair; touch-action: none; }
.view input[type=range] { width: 100%; }

/* range styling */
input[type=range] {
  -webkit-appearance: none; appearance: none; height: 4px; border-radius: 4px;
  background: #2b343f; outline: none;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent-2); cursor: pointer; border: 2px solid #0d1117;
}
input[type=range]::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%; background: var(--accent-2);
  cursor: pointer; border: 2px solid #0d1117;
}

.controls {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 16px; margin-top: 18px;
}
.mods { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  display: flex; flex-direction: column; gap: 6px; padding: 8px 10px;
  background: var(--panel-2); border: 1px solid #232b35; border-radius: 12px;
  min-width: 150px;
}
.chip-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.chip .toggle {
  display: flex; align-items: center; gap: 8px; background: none; border: none;
  color: #8d97a4; font-weight: 600; font-size: 13px; cursor: pointer; padding: 0;
}
.chip .cmode {
  flex: none; cursor: pointer;
  font-size: 10px; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase;
  padding: 3px 9px; border-radius: 999px;
  transition: color .15s, border-color .15s, background .15s;
}
.chip .cmode:not(.gray) { color: var(--accent-2); border: 1px solid #2f4a52; background: #10242a; }
.chip .cmode.gray { color: #c4ccd6; border: 1px solid #39424d; background: #1b2129; }
.chip .cmode:hover { filter: brightness(1.18); }
.chip .toggle i { width: 11px; height: 11px; border-radius: 3px; opacity: 0.4; transition: opacity .15s, box-shadow .15s; }
.chip.on { border-color: #36505c; }
.chip.on .toggle { color: #eaf6ff; }
.chip.on .toggle i { opacity: 1; box-shadow: 0 0 8px currentColor; }
.chip .op { width: 100%; }
.chip:not(.on) .op { opacity: 0.35; }

.extra { display: flex; align-items: center; gap: 18px; }
.mini { display: flex; flex-direction: column; gap: 6px; font-size: 12px; color: #8d97a4; font-weight: 600; min-width: 120px; }
.mini.check { flex-direction: row; align-items: center; gap: 8px; }
.mini.check input { accent-color: var(--accent-2); }

.loading {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  background: rgba(13,17,23,0.7); color: #cfe9f2; font-size: 14px; border-radius: 14px;
  backdrop-filter: blur(2px);
}
.loading[hidden] { display: none; }
.hint { color: var(--muted); font-size: 14px; margin-top: 18px; text-align: center; }
.hint b { color: var(--accent); }

/* ---------- survey ---------- */
.survey { background: #fff; }
.survey .section-lead { margin-left: auto; margin-right: auto; }
.pill {
  display: inline-block; margin-top: 8px; padding: 10px 22px; border-radius: 999px;
  background: linear-gradient(120deg, rgba(31,122,140,0.12), rgba(110,231,255,0.18));
  color: var(--accent); font-weight: 600; border: 1px solid rgba(31,122,140,0.25);
}

/* ---------- footer ---------- */
footer { padding: 56px 0 70px; background: var(--bg); }
.cite-title { font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); margin: 0 0 12px; }
.cite {
  background: var(--panel); color: #d7dde6; padding: 20px 22px; border-radius: 14px;
  overflow-x: auto; font-size: 12.5px; line-height: 1.6; margin: 0;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
}
.foot-note { color: var(--muted); font-size: 13px; margin-top: 20px; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .viewer { grid-template-columns: 1fr; }
  .cases { flex-direction: row; max-height: none; overflow-x: auto; padding-right: 0; padding-bottom: 4px; }
  .case { min-width: 104px; }
  .case img { aspect-ratio: 1; }
  .panes { grid-template-columns: repeat(3, 1fr); }
  .panes.is-grid { grid-template-columns: repeat(2, 1fr); max-width: 520px; }
  .controls { flex-direction: column; align-items: stretch; }
  .layoutbar { justify-content: flex-start; }
}

@media (max-width: 600px) {
  .band { padding: 44px 0; }
  .hero { padding: 52px 0 30px; }
  .wrap { padding: 0 18px; }
  .stats { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .stats div { padding: 14px 8px; }
  .stats b { font-size: 22px; }
  .stats span { font-size: 11px; }
  .links { gap: 8px; }
  .btn { padding: 9px 13px; font-size: 13px; }
  .viewer { padding: 12px; gap: 14px; border-radius: 16px; }
  .panes { grid-template-columns: 1fr; max-width: 360px; margin: 0 auto; }
  .panes.is-grid { max-width: 360px; }
  .pipeline { max-width: 100%; }
  .cite { font-size: 11.5px; padding: 16px; }
}