/* ===========================================================
   VSCLAB @ UC Riverside — chip gallery (light theme)

   The page is light; the image surfaces are dark. Almost every
   layout in the gallery is rendered on black, so a dark mat frames
   them and keeps the layouts legible.
   =========================================================== */

:root {
  --bg:        #f4f6f9;
  --bg-2:      #ffffff;
  --panel:     #ffffff;
  --panel-2:   #eef1f6;
  --line:      #e1e6ee;
  --line-2:    #c9d1df;
  --ink:       #111827;
  --ink-2:     #4b5668;
  --ink-3:     #7c8798;
  --mat:       #0b0e16;   /* dark backdrop behind layout images */
  --gold:      #8a5e00;   /* readable amber for text on light */
  --gold-fill: #ffb81c;   /* UCR gold, used as a fill behind dark text */
  --blue:      #1a56b0;   /* UCR blue, darkened for white backgrounds */
  --teal:      #0e7490;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: ui-sans-serif, -apple-system, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); }

/* ---------------------------------------------------------- header */

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(1100px 420px at 12% -10%, rgba(26,86,176,.13), transparent 62%),
    radial-gradient(900px 380px at 88% 0%,  rgba(255,184,28,.26), transparent 62%),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 100%);
}

/* faint routing-grid texture behind the title */
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(26,86,176,.075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26,86,176,.075) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: linear-gradient(180deg, #000 0%, transparent 85%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 85%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  max-width: 1440px;
  margin: 0 auto;
  padding: 64px 28px 44px;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .20em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 18px;
}

h1 {
  margin: 0;
  font-size: clamp(30px, 5.1vw, 60px);
  line-height: 1.06;
  letter-spacing: -.022em;
  font-weight: 700;
  max-width: 19ch;
}
h1 .accent {
  background: linear-gradient(94deg, #003da5, #2f7fd0);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  margin: 22px 0 0;
  max-width: 66ch;
  font-size: 16.5px;
  color: var(--ink-2);
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  margin-top: 38px;
  padding-top: 28px;
  border-top: 1px solid var(--line-2);
}
.stat .n {
  font-family: var(--mono);
  font-size: 30px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.1;
}
.stat .l {
  font-size: 11.5px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: 4px;
}

/* ---------------------------------------------------------- controls */

.controls {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.controls-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
}

.filter-group { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; }
.filter-group > .glabel {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-right: 3px;
}

.chip {
  appearance: none;
  border: 1px solid var(--line-2);
  background: #fff;
  color: var(--ink-2);
  font: inherit;
  font-size: 13px;
  padding: 6px 13px;
  border-radius: 999px;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
  white-space: nowrap;
}
.chip:hover { background: var(--panel-2); color: var(--ink); }
.chip[aria-pressed="true"] {
  background: var(--gold-fill);
  border-color: #e0a00d;
  color: #2a2000;
  font-weight: 600;
}
.chip .c { opacity: .62; font-family: var(--mono); font-size: 11px; margin-left: 5px; }

.search {
  flex: 1 1 200px;
  min-width: 170px;
  max-width: 320px;
  margin-left: auto;
  background: #fff;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  color: var(--ink);
  font: inherit;
  font-size: 13.5px;
  padding: 7px 12px;
}
.search::placeholder { color: var(--ink-3); }
.search:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(26,86,176,.14); }

/* ---------------------------------------------------------- grid */

main { max-width: 1440px; margin: 0 auto; padding: 34px 28px 90px; }

.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 42px 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-2);
}
.section-head:first-child { margin-top: 6px; }
.section-head h2 {
  margin: 0;
  font-size: 20px;
  letter-spacing: -.01em;
  font-weight: 650;
}
.section-head .sub {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 20px;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 13px;
  overflow: hidden;
  cursor: pointer;
  text-align: left;
  padding: 0;
  color: inherit;
  font: inherit;
  box-shadow: 0 1px 2px rgba(17,24,39,.05);
  transition: transform .17s ease, border-color .17s, box-shadow .17s;
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--line-2);
  box-shadow: 0 14px 30px rgba(17,24,39,.14);
}
.card:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

.thumb {
  position: relative;
  aspect-ratio: 1 / 1;
  background: var(--mat);
  overflow: hidden;
}
.thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .4s ease;
}
.card:hover .thumb img { transform: scale(1.035); }
.thumb.empty {
  display: grid;
  place-items: center;
  background:
    repeating-linear-gradient(45deg, #eaeef4 0 11px, #f4f6f9 11px 22px);
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  text-align: center;
  padding: 20px;
}
.imgcount {
  position: absolute;
  right: 9px; bottom: 9px;
  font-family: var(--mono);
  font-size: 10.5px;
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(255,255,255,.90);
  border: 1px solid rgba(17,24,39,.12);
  color: var(--ink-2);
}

.card-body { padding: 15px 16px 16px; display: flex; flex-direction: column; flex: 1; }

.badges { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.badge {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .05em;
  padding: 3px 8px;
  border-radius: 5px;
  border: 1px solid transparent;
  white-space: nowrap;
}
.badge.node { background: #fdf3da; color: #7a5200; border-color: #f0dcae; }
.badge.tool { background: #e8f0fc; color: #164a99; border-color: #c9dcf6; }
.badge.pdk  { background: #e2f3f6; color: #0b6077; border-color: #bfe2ea; }

.card h3 {
  margin: 0 0 7px;
  font-size: 16.5px;
  line-height: 1.3;
  letter-spacing: -.01em;
  font-weight: 620;
}
.card p {
  margin: 0 0 14px;
  font-size: 13.2px;
  color: var(--ink-2);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.headmetrics {
  margin-top: auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding-top: 13px;
  border-top: 1px solid var(--line);
}
.headmetrics div { min-width: 0; }
.headmetrics .k {
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.headmetrics .v {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink);
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.empty-state {
  grid-column: 1 / -1;
  padding: 70px 20px;
  text-align: center;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 13px;
}

/* ---------------------------------------------------------- detail overlay */

.overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(17,24,39,.42);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  display: none;
  overflow-y: auto;
  overscroll-behavior: contain;
}
.overlay.open { display: block; }

.sheet {
  max-width: 1320px;
  margin: 34px auto;
  background: var(--bg-2);
  border: 1px solid var(--line-2);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 26px 70px rgba(17,24,39,.3);
}

.sheet-top {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 24px 28px 20px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(26,86,176,.055), transparent);
}
.sheet-top h2 { margin: 6px 0 8px; font-size: 26px; letter-spacing: -.018em; line-height: 1.2; }
.sheet-top p  { margin: 0; color: var(--ink-2); max-width: 78ch; font-size: 14.5px; }

.xbtn {
  margin-left: auto;
  flex: none;
  width: 36px; height: 36px;
  border-radius: 9px;
  border: 1px solid var(--line-2);
  background: #fff;
  color: var(--ink-2);
  font-size: 19px;
  line-height: 1;
  cursor: pointer;
}
.xbtn:hover { background: var(--panel-2); color: var(--ink); }

.sheet-body {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: 0;
}
.sheet-left  { padding: 22px 24px 28px; border-right: 1px solid var(--line); min-width: 0; }
.sheet-right { padding: 22px 26px 30px; min-width: 0; }

.viewer {
  background: var(--mat);
  border: 1px solid var(--line-2);
  border-radius: 11px;
  overflow: hidden;
}
.viewer img { width: 100%; display: block; }
.viewer-cap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 12.8px;
  color: var(--ink-2);
  background: var(--panel-2);
}
.viewer-cap .idx { font-family: var(--mono); font-size: 11px; color: var(--ink-3); flex: none; }
.viewer-cap .full {
  margin-left: auto;
  flex: none;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--blue);
  text-decoration: none;
  border: 1px solid var(--line-2);
  border-radius: 6px;
  padding: 3px 8px;
  background: #fff;
}
.viewer-cap .full:hover { border-color: var(--blue); }

.strip {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(76px, 1fr));
  gap: 8px;
  margin-top: 12px;
}
.strip button {
  padding: 0;
  border: 1px solid var(--line-2);
  border-radius: 7px;
  overflow: hidden;
  background: var(--mat);
  cursor: pointer;
  aspect-ratio: 1 / 1;
}
.strip button img { width: 100%; height: 100%; object-fit: cover; display: block; opacity: .72; transition: opacity .15s; }
.strip button:hover img { opacity: .88; }
.strip button[aria-current="true"] { border-color: var(--blue); box-shadow: 0 0 0 2px rgba(26,86,176,.25); }
.strip button[aria-current="true"] img { opacity: 1; }

.noimg {
  padding: 46px 22px;
  text-align: center;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 12.5px;
  border: 1px dashed var(--line-2);
  border-radius: 11px;
  background: repeating-linear-gradient(45deg, #eaeef4 0 11px, #f4f6f9 11px 22px);
}

.block { margin-bottom: 24px; }
.block h4 {
  margin: 0 0 9px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 700;
}
.block p { margin: 0; color: var(--ink-2); font-size: 13.8px; }

table.specs { width: 100%; border-collapse: collapse; }
table.specs td {
  padding: 7px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  font-size: 13.2px;
}
table.specs tr:last-child td { border-bottom: none; }
table.specs td.k { width: 44%; color: var(--ink-3); padding-right: 14px; }
table.specs td.v { color: var(--ink); font-family: var(--mono); font-size: 12.4px; line-height: 1.55; }
table.specs td.v code { font-family: var(--mono); background: var(--panel-2); padding: 1px 4px; border-radius: 4px; }

footer {
  border-top: 1px solid var(--line-2);
  background: #fff;
  padding: 34px 28px 60px;
  color: var(--ink-2);
  font-size: 13px;
}
footer .fin { max-width: 1440px; margin: 0 auto; }
footer p { margin: 0 0 8px; max-width: 90ch; }
footer p.lic {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}
footer strong { color: var(--ink); }
footer code { font-family: var(--mono); background: var(--panel-2); padding: 1px 4px; border-radius: 4px; }

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

@media (max-width: 980px) {
  .sheet-body { grid-template-columns: 1fr; }
  .sheet-left { border-right: none; border-bottom: 1px solid var(--line); }
}
@media (max-width: 720px) {
  .hero-inner { padding: 44px 18px 34px; }
  .controls-inner { padding: 12px 18px; }
  main { padding: 26px 18px 70px; }
  .stats { gap: 26px; }
  .stat .n { font-size: 24px; }
  .search { margin-left: 0; max-width: none; }
  .sheet { margin: 0; border-radius: 0; border-left: none; border-right: none; min-height: 100%; }
  .sheet-top { padding: 18px 18px 16px; }
  .sheet-top h2 { font-size: 21px; }
  .sheet-left, .sheet-right { padding: 18px; }
  .grid { grid-template-columns: 1fr; }
  table.specs td.k { width: 42%; }
}