/* v1 project page — COLM 2026
   Palette: ink on graph paper, five pointer hues (one per <obj>).      */

:root {
  --paper: #fbfcf8;
  --grid: rgba(30, 58, 95, 0.06);
  --ink: #1a2438;
  --muted: #5c6577;
  --rule: #dce1e8;
  --card: #ffffff;
  --obj1: #e4572e;
  --obj2: #0e7c7b;
  --obj3: #7a5cc5;
  --obj4: #b07a00;
  --obj5: #c2185b;
  --display: "Space Grotesk", sans-serif;
  --body: "IBM Plex Sans", sans-serif;
  --mono: "IBM Plex Mono", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--body);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
}

main, .hero { max-width: 880px; margin: 0 auto; padding: 0 1.25rem; }

a { color: var(--ink); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible { outline: 2px solid var(--obj1); outline-offset: 2px; border-radius: 2px; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- hero ---------- */

.hero { padding-top: 4.5rem; text-align: center; }

.wordmark {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(6rem, 18vw, 10rem);
  line-height: 1;
  margin: 2.2rem 0 1.8rem;
  display: flex;
  justify-content: center;
}

.wordmark-box {
  position: relative;
  padding: 0.05em 0.12em;
  border: 3px solid var(--obj1);
}

.handle {
  position: absolute;
  width: 10px; height: 10px;
  background: var(--paper);
  border: 3px solid var(--obj1);
}
.h-tl { top: -7px; left: -7px; }
.h-tr { top: -7px; right: -7px; }
.h-bl { bottom: -7px; left: -7px; }
.h-br { bottom: -7px; right: -7px; }

.wordmark-label {
  position: absolute;
  top: -1.1rem;
  right: -0.4rem;
  transform: translateY(-100%);
  font-family: var(--mono);
  font-weight: 500;
  font-size: clamp(0.7rem, 1.6vw, 0.85rem);
  letter-spacing: 0;
  color: #fff;
  background: var(--obj1);
  padding: 0.2em 0.55em;
  border-radius: 3px;
  white-space: nowrap;
}

.subtitle {
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(1.35rem, 3.4vw, 1.9rem);
  line-height: 1.25;
  margin-bottom: 1.6rem;
}

.authors { font-size: 1rem; line-height: 1.9; }
.authors a { text-decoration: none; border-bottom: 1px solid var(--rule); }
.authors a:hover { border-bottom-color: var(--ink); }
.affil { color: var(--muted); font-size: 0.9rem; margin-top: 0.35rem; }

.links { margin: 2rem 0 0; display: flex; flex-wrap: wrap; gap: 0.6rem; justify-content: center; }

.btn {
  font-family: var(--mono);
  font-size: 0.9rem;
  text-decoration: none;
  padding: 0.45em 1.1em;
  border: 1.5px solid var(--ink);
  border-radius: 999px;
  background: var(--card);
  transition: background 0.15s, color 0.15s;
}
.btn:hover { background: var(--ink); color: var(--paper); }

/* ---------- teaser ---------- */

.teaser { margin: 4rem auto 0; }
.teaser img {
  width: 100%;
  display: block;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--card);
}
.teaser figcaption {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 0.7rem;
  text-align: center;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- sections ---------- */

.section { margin-top: 5.5rem; }
.section h2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  margin: 0.4rem 0 1rem;
}
.lede { max-width: 46rem; }
.hint { color: var(--muted); }

.obj-demo {
  font-family: var(--mono);
  font-size: 0.85em;
  color: var(--obj1);
  border: 1px solid currentColor;
  border-radius: 4px;
  padding: 0 0.3em;
}

code.inline { font-family: var(--mono); font-size: 0.9em; }

/* ---------- point-and-copy demo ---------- */

.demo {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: 1.5rem;
  align-items: start;
}

.demo-image {
  position: sticky;
  top: 1.5rem;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1rem;
}

.task {
  font-size: 0.875rem;
  line-height: 1.55;
  margin-bottom: 0.9rem;
}
.task-tag {
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 0.1em 0.4em;
  margin-right: 0.4em;
}
.choices { color: var(--muted); }

.demo-image svg { width: 100%; height: auto; display: block; }

.box {
  fill: transparent;
  stroke-width: 2.5;
  opacity: 0;
  transition: opacity 0.15s;
  pointer-events: none;
}
.box-1 { stroke: var(--obj1); fill: rgba(228, 87, 46, 0.1); }
.box-2 { stroke: var(--obj2); fill: rgba(14, 124, 123, 0.1); }
.box-3 { stroke: var(--obj3); fill: rgba(122, 92, 197, 0.1); }
.box-4 { stroke: var(--obj4); fill: rgba(176, 122, 0, 0.1); }
.box-5 { stroke: var(--obj5); fill: rgba(194, 24, 91, 0.1); }
.box.active { opacity: 1; }

.demo-trace {
  font-size: 0.95rem;
  border-left: 2px solid var(--rule);
  padding-left: 1.4rem;
}
.demo-trace p { margin-bottom: 0.9rem; }

.detect {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 2;
  color: var(--muted);
  overflow-wrap: anywhere;
}

.obj {
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 500;
  border: 1px solid;
  border-radius: 4px;
  padding: 0.05em 0.35em;
  background: var(--card);
  cursor: crosshair;
  transition: background 0.15s, color 0.15s;
}
.obj-1 { color: var(--obj1); border-color: var(--obj1); }
.obj-2 { color: var(--obj2); border-color: var(--obj2); }
.obj-3 { color: var(--obj3); border-color: var(--obj3); }
.obj-4 { color: var(--obj4); border-color: var(--obj4); }
.obj-5 { color: var(--obj5); border-color: var(--obj5); }
.obj:hover, .obj:focus-visible { color: #fff; }
.obj-1:hover, .obj-1:focus-visible { background: var(--obj1); }
.obj-2:hover, .obj-2:focus-visible { background: var(--obj2); }
.obj-3:hover, .obj-3:focus-visible { background: var(--obj3); }
.obj-4:hover, .obj-4:focus-visible { background: var(--obj4); }
.obj-5:hover, .obj-5:focus-visible { background: var(--obj5); }

.conclusion strong { font-size: 1.05em; }
.answer {
  font-family: var(--mono);
  font-weight: 500;
  color: var(--obj2);
  margin-left: 0.3em;
}

/* ---------- abstract ---------- */

.abstract-text { max-width: 46rem; }

/* ---------- resource cards ---------- */

.cards {
  margin-top: 1.6rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.1rem 1.2rem;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 6px;
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s;
}
.card:hover { border-color: var(--ink); transform: translateY(-2px); }

.card-kind {
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.card-name { font-family: var(--display); font-weight: 700; font-size: 1.05rem; }
.card-desc { font-size: 0.875rem; color: var(--muted); line-height: 1.5; }

/* ---------- bibtex ---------- */

.bibtex-wrap { position: relative; margin-top: 1.4rem; }

.bibtex-wrap pre {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.6;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.2rem 1.4rem;
  overflow-x: auto;
}

.copy-btn {
  position: absolute;
  top: 0.7rem;
  right: 0.7rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 0.25em 0.8em;
  border: 1.5px solid var(--ink);
  border-radius: 999px;
  background: var(--card);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.copy-btn:hover { background: var(--ink); color: var(--paper); }

/* ---------- footer ---------- */

footer {
  margin-top: 6rem;
  padding: 2.5rem 1.25rem 3rem;
  border-top: 1px solid var(--rule);
  text-align: center;
  font-size: 0.9rem;
  color: var(--muted);
}

/* ---------- responsive ---------- */

@media (max-width: 720px) {
  .demo { grid-template-columns: 1fr; }
  .demo-image { position: static; }
  .cards { grid-template-columns: 1fr; }
  .hero { padding-top: 3rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
  .card:hover { transform: none; }
}