/* ============================================================
   Prizma — research site
   Dark, refined research aesthetic. Self-contained.
   ============================================================ */

:root {
  --bg:        #0b0d10;
  --bg-soft:   #111419;
  --panel:     #14181e;
  --panel-2:   #181d24;
  --line:      #232a33;
  --line-soft: #1b212a;
  --ink:       #e7ebf0;
  --ink-soft:  #aab3c0;
  --ink-mut:   #717c8a;
  --accent:    #6ee7c4;   /* mint/teal — matches the figure's Prizma line */
  --accent-2:  #7aa2ff;
  --warn:      #f2b66d;
  --pass:      #6ee7c4;
  --win:       #7aa2ff;
  --radius:    14px;
  --maxw:      980px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Roboto Mono", Menlo, Consolas, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(1100px 620px at 78% -8%, rgba(110,231,196,0.08), transparent 60%),
    radial-gradient(900px 540px at 8% 4%, rgba(122,162,255,0.06), transparent 55%),
    var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- hero ---------- */
.hero {
  padding: 92px 0 56px;
  border-bottom: 1px solid var(--line-soft);
}
.eyebrow {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 22px;
}
.title {
  font-size: clamp(56px, 11vw, 104px);
  line-height: 0.95;
  font-weight: 700;
  letter-spacing: -0.04em;
  margin: 0;
  background: linear-gradient(180deg, #ffffff 0%, #c7d0db 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.subtitle {
  font-size: clamp(19px, 2.6vw, 23px);
  color: var(--ink-soft);
  font-weight: 500;
  margin: 18px 0 0;
  letter-spacing: -0.01em;
}
.tagline {
  margin: 26px 0 0;
  max-width: 64ch;
  color: var(--ink-soft);
  font-size: 17px;
}
.tagline strong { color: var(--ink); font-weight: 600; }

.author {
  margin-top: 30px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-mut);
}
.author .name { color: var(--ink); }

/* ---------- section scaffolding ---------- */
section { padding: 64px 0; border-bottom: 1px solid var(--line-soft); }
.section-tag {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mut);
  margin: 0 0 12px;
}
h2 {
  font-size: clamp(28px, 4vw, 38px);
  letter-spacing: -0.025em;
  font-weight: 650;
  margin: 0 0 14px;
  line-height: 1.1;
}
h3 {
  font-size: 20px;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  font-weight: 600;
}
.lede { color: var(--ink-soft); max-width: 70ch; margin: 0 0 8px; }

/* ---------- two-thread overview ---------- */
.threads {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 34px;
}
.thread {
  background: linear-gradient(180deg, var(--panel) 0%, var(--bg-soft) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 26px;
  position: relative;
  overflow: hidden;
}
.thread::before {
  content: "";
  position: absolute; inset: 0 0 auto 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent 70%);
}
.thread.alt::before {
  background: linear-gradient(90deg, var(--accent-2), transparent 70%);
}
.thread .kicker {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mut);
  margin: 0 0 10px;
}
.thread h3 { font-size: 22px; margin-bottom: 10px; }
.thread.alt h3 { color: var(--ink); }
.thread p { color: var(--ink-soft); font-size: 15.5px; margin: 0 0 14px; }
.verdict-chip {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--accent);
}
.thread.alt .verdict-chip { color: var(--accent-2); }

/* ---------- tables ---------- */
.table-card {
  margin-top: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}
table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
thead th {
  text-align: left;
  font-family: var(--mono);
  font-weight: 500;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mut);
  padding: 14px 16px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
tbody td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--ink-soft);
  vertical-align: top;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: rgba(255,255,255,0.015); }
td .leg { color: var(--ink); font-weight: 600; }
td.num, th.num { font-family: var(--mono); font-variant-numeric: tabular-nums; }

.badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 3px 9px;
  border-radius: 6px;
  white-space: nowrap;
}
.badge.pass { color: #0b0d10; background: var(--pass); }
.badge.win  { color: #0b0d10; background: var(--win); }
.badge.mem  { color: var(--pass); background: rgba(110,231,196,0.12); border: 1px solid rgba(110,231,196,0.3); }

/* highlight row (best W^T-free learner) */
tr.highlight td { background: rgba(110,231,196,0.06); }
tr.highlight td .leg { color: var(--accent); }
tr.bound td { color: var(--ink-mut); }

.yes { color: var(--accent); font-weight: 600; }
.dash { color: var(--ink-mut); }
.no { color: var(--ink-mut); }

/* ---------- inference highlight ---------- */
.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 30px;
}
.metric {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 22px;
}
.metric .big {
  font-family: var(--mono);
  font-size: clamp(30px, 5vw, 40px);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--accent);
  line-height: 1;
}
.metric .lbl {
  margin-top: 12px;
  font-size: 14px;
  color: var(--ink-soft);
}
.metric .sub { color: var(--ink-mut); font-size: 13px; margin-top: 6px; }

/* ---------- figure ---------- */
.figure-card {
  margin-top: 30px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  overflow: hidden;
}
.figure-card img { width: 100%; height: auto; display: block; border-radius: 6px; }
figcaption {
  margin-top: 14px;
  padding: 0 4px;
  color: var(--ink-mut);
  font-size: 13.5px;
  line-height: 1.55;
}

/* ---------- honest scope callout ---------- */
.callout {
  margin-top: 8px;
  background: linear-gradient(180deg, rgba(242,182,109,0.07), rgba(242,182,109,0.02));
  border: 1px solid rgba(242,182,109,0.28);
  border-left: 3px solid var(--warn);
  border-radius: var(--radius);
  padding: 28px 30px;
}
.callout h2 { color: var(--warn); margin-bottom: 6px; }
.callout .lede { color: var(--ink-soft); }
.callout ul { margin: 18px 0 0; padding: 0; list-style: none; }
.callout li {
  position: relative;
  padding: 9px 0 9px 26px;
  border-top: 1px solid var(--line-soft);
  color: var(--ink-soft);
  font-size: 15px;
}
.callout li:first-child { border-top: none; }
.callout li::before {
  content: "—";
  position: absolute; left: 0; top: 9px;
  color: var(--warn);
  font-family: var(--mono);
}
.callout li strong { color: var(--ink); font-weight: 600; }

/* ---------- footer ---------- */
footer { padding: 64px 0 90px; border-bottom: none; }
.cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin: 6px 0 36px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  padding: 14px 22px;
  border-radius: 10px;
  transition: transform 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--accent);
  color: #07130f;
  border: 1px solid var(--accent);
}
.btn-primary:hover { background: #88f0d2; }
.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--line);
}
.btn-ghost:hover { border-color: var(--ink-mut); color: var(--ink); }
.btn .arrow { opacity: 0.7; }
.btn-ghost.soon { opacity: 0.85; }
.btn-ghost.soon .arrow { display: none; }

.footnote {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-mut);
  line-height: 1.7;
}
.footnote .sep { color: var(--line); margin: 0 8px; }

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  body { font-size: 16px; }
  .wrap { padding: 0 20px; }
  .hero { padding: 64px 0 44px; }
  .threads { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: 1fr; }
  .table-card { overflow-x: auto; }
  table { min-width: 560px; }
  section { padding: 48px 0; }
}