/* ================================================================
   ARTMECHO — Site styles (mobile-first)
================================================================ */

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--ink);
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, var(--gold-glow), transparent 70%),
    var(--bg-0);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--gold); text-decoration: none; }
a:hover, a:focus-visible { color: var(--gold-bright); }

/* ---------- Layout helpers ---------- */
.wrap {
  width: min(var(--content-max), 100% - 2.5rem);
  margin-inline: auto;
}

section { padding-block: var(--space-5); }

.eyebrow {
  font-size: var(--text-xs);
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: var(--space-2);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--ink);
  margin-bottom: var(--space-3);
}

/* ---------- Deco ornaments ---------- */
.ornament {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--gold);
  margin-block: var(--space-3);
}
.ornament::before,
.ornament::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-line));
}
.ornament::after {
  background: linear-gradient(90deg, var(--gold-line), transparent);
}
.ornament .diamond {
  width: 8px; height: 8px;
  background: var(--gold);
  transform: rotate(45deg);
  flex-shrink: 0;
}
.ornament .diamond.small { width: 5px; height: 5px; opacity: 0.6; }
.ornament .diamond.mid   { width: 7px; height: 7px; }

/* Chevron divider */
.chevrons {
  height: 10px;
  background:
    repeating-linear-gradient(135deg,
      var(--gold-dim) 0 2px,
      transparent 2px 12px);
  opacity: 0.5;
}

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 8, 12, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--gold-line);
}

.nav {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-family: var(--font-display);
  font-size: 1.4rem;
  letter-spacing: 0.3em;
  color: var(--gold);
}
.brand span { color: var(--ink); }

.nav-links {
  display: flex;
  gap: var(--space-3);
  list-style: none;
}
.nav-links a {
  font-size: var(--text-sm);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  padding-block: var(--space-1);
}
.nav-links a:hover,
.nav-links a[aria-current="page"] { color: var(--gold-bright); }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--gold-line);
  color: var(--gold);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 0.45rem 0.9rem;
  cursor: pointer;
  border-radius: var(--radius);
}

@media (max-width: 48rem) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg-1);
    border-bottom: 1px solid var(--gold-line);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    display: block;
    padding: var(--space-2) 1.5rem;
    border-top: 1px solid var(--panel-edge);
  }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding-block: var(--space-6) var(--space-5);
  text-align: center;
  overflow: hidden;
}

/* Art deco sunburst */
.hero::before {
  content: "";
  position: absolute;
  inset: -40% -20% auto -20%;
  height: 120%;
  background: repeating-conic-gradient(
    from 0deg at 50% 0%,
    var(--gold-glow) 0deg 1.5deg,
    transparent 1.5deg 12deg
  );
  opacity: 0.35;
  pointer-events: none;
}

.hero .wrap { position: relative; }

.hero-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-hero);
  letter-spacing: 0.25em;
  color: var(--gold-bright);
  text-shadow: 0 0 40px var(--gold-glow);
  margin-bottom: var(--space-2);
}
.hero-title .dot { color: var(--cyan); }

.hero-sub {
  max-width: 42rem;
  margin-inline: auto;
  color: var(--muted);
  font-size: var(--text-lg);
  font-weight: 300;
  letter-spacing: 0.05em;
}

.hero-cta {
  margin-top: var(--space-4);
  display: inline-block;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  padding: 0.85rem 2rem;
  border: 1px solid var(--gold);
  color: var(--gold-bright);
  background: transparent;
  border-radius: var(--radius);
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}
.btn:hover, .btn:focus-visible {
  background: var(--gold);
  color: var(--bg-0);
  box-shadow: 0 0 24px var(--gold-glow);
}
.btn.ghost {
  border-color: var(--gold-line);
  color: var(--muted);
}
.btn.ghost:hover {
  background: transparent;
  color: var(--gold-bright);
  border-color: var(--gold);
  box-shadow: none;
}

/* ---------- Cards ---------- */
.card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius);
  padding: var(--space-3);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.card:hover {
  border-color: var(--gold-line);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

/* Deco corner ticks */
.card::before, .card::after {
  content: "";
  position: absolute;
  width: 14px; height: 14px;
  border: 1px solid var(--gold-dim);
  pointer-events: none;
}
.card::before {
  top: -1px; left: -1px;
  border-right: none; border-bottom: none;
}
.card::after {
  bottom: -1px; right: -1px;
  border-left: none; border-top: none;
}
.card:hover::before, .card:hover::after { border-color: var(--gold); }

/* Featured cards on home (one per experiment group) */
.featured-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}
@media (min-width: 48rem) {
  .featured-grid { grid-template-columns: repeat(3, 1fr); }
}

.featured-card { display: flex; flex-direction: column; }
.featured-card .glyph {
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--gold);
  margin-bottom: var(--space-1);
}
.featured-card h3 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-xl);
  letter-spacing: 0.1em;
  margin-bottom: var(--space-1);
}
.featured-card p {
  color: var(--muted);
  font-size: var(--text-sm);
  flex: 1;
  margin-bottom: var(--space-2);
}
.featured-card .card-link {
  font-size: var(--text-xs);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gold);
}

/* ---------- Experiments page ---------- */
.page-head {
  padding-block: var(--space-5) var(--space-3);
  border-bottom: 1px solid var(--panel-edge);
}
.page-head h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-2xl);
  letter-spacing: 0.15em;
  color: var(--gold-bright);
}
.page-head p {
  color: var(--muted);
  max-width: 46rem;
  margin-top: var(--space-2);
}

.exp-group { padding-block: var(--space-4); }

.exp-group-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-1);
}
.exp-group-head h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-xl);
  letter-spacing: 0.15em;
}
.exp-group-head .count {
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--faint);
  text-transform: uppercase;
}

.exp-group > p.group-desc {
  color: var(--muted);
  max-width: 52rem;
  margin-bottom: var(--space-3);
  font-size: var(--text-sm);
}

.demo-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}
@media (min-width: 40rem)  { .demo-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 64rem)  { .demo-grid { grid-template-columns: repeat(3, 1fr); } }

/* Demo cards */
.demo-card h3 {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-1);
  color: var(--ink);
}
.demo-card .model {
  display: inline-block;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold-bright);
  border: 1px solid var(--gold-line);
  background: var(--gold-glow);
  padding: 0.1rem 0.55rem;
  border-radius: var(--radius);
  margin: 0 0.35rem 0.35rem 0;
}
.demo-card .quant {
  display: inline-block;
  font-size: var(--text-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--cyan);
  border: 1px solid var(--cyan-dim);
  background: var(--cyan-dim);
  padding: 0.1rem 0.55rem;
  border-radius: var(--radius);
  margin-bottom: var(--space-1);
}
.demo-card .meta {
  font-size: var(--text-xs);
  color: var(--faint);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}
.demo-card .note {
  font-size: var(--text-sm);
  color: var(--muted);
  margin-bottom: var(--space-2);
}
.demo-card .card-link {
  font-size: var(--text-xs);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gold);
}
.demo-card .card-link:hover { color: var(--gold-bright); }

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}
@media (min-width: 48rem) {
  .about-grid { grid-template-columns: 1fr 1fr; }
}
.about-grid p { color: var(--muted); }
.about-grid p + p { margin-top: var(--space-2); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--gold-line);
  padding-block: var(--space-4);
  margin-top: var(--space-4);
  text-align: center;
}
.site-footer .brand { font-size: 1.1rem; margin-bottom: var(--space-1); }
.site-footer p {
  font-size: var(--text-xs);
  letter-spacing: 0.15em;
  color: var(--faint);
  text-transform: uppercase;
}

/* ---------- Run details (documented runs) ---------- */
.run-details {
  margin-bottom: var(--space-2);
}
.run-details > summary {
  cursor: pointer;
  font-size: var(--text-xs);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--cyan);
  list-style: none;
  padding-block: var(--space-1);
  border-top: 1px solid var(--panel-edge);
}
.run-details > summary::-webkit-details-marker { display: none; }
.run-details > summary::before { content: "▸ "; color: var(--gold); }
.run-details[open] > summary::before { content: "▾ "; }
.run-details > summary:hover { color: var(--gold-bright); }

.rd-body { padding-top: var(--space-2); }

.rd-stats div + div { margin-top: var(--space-1); }
.rd-stats dt {
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}
.rd-stats dd {
  color: var(--muted);
  font-size: var(--text-sm);
}
.rd-stats dd a { color: var(--cyan); }

.rd-prompt {
  margin-top: var(--space-2);
  padding: var(--space-2);
  background: var(--bg-0);
  border: 1px solid var(--panel-edge);
  border-left: 2px solid var(--gold-dim);
  border-radius: var(--radius);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.75rem;
  line-height: 1.55;
  color: var(--muted);
  white-space: pre-wrap;
  word-wrap: break-word;
  max-height: 18rem;
  overflow: auto;
}