/* AlphaAdj project page — single stylesheet, no external dependencies. */

:root {
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --ink: #12151c;
  --ink-soft: #565c6b;
  --ink-faint: #8a8f9c;
  --bg: #ffffff;
  --bg-soft: #f6f7fa;
  --accent: #2454e8;
  --accent-dark: #1b3fb8;
  --accent-soft: #eaf0fe;
  --border: #e6e8ee;
  --frame: #0c0e13;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow-md: 0 8px 28px rgba(16, 24, 40, 0.08);
  --radius: 14px;
  --radius-sm: 9px;
  --max: 1040px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

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

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

section { padding: 76px 0; }
section.soft { background: var(--bg-soft); }
section + section { border-top: 1px solid var(--border); }

h1, h2, h3 { font-weight: 700; letter-spacing: -0.01em; margin: 0; }

.eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 10px;
}

.section-head {
  max-width: 640px;
  margin: 0 auto 40px;
  text-align: center;
}

.section-head h2 {
  font-size: 1.7rem;
  margin-bottom: 10px;
}

.section-head p {
  color: var(--ink-soft);
  font-size: 1.02rem;
  margin: 0;
}

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

.hero {
  padding: 96px 0 56px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  line-height: 1.22;
  max-width: 880px;
  margin: 0 auto 18px;
}

.hero .byline {
  color: var(--ink-faint);
  font-size: 0.95rem;
  margin-bottom: 22px;
}

.hero .tagline {
  max-width: 620px;
  margin: 0 auto;
  font-size: 1.15rem;
  color: var(--ink-soft);
}

/* ---------- media frame (video / figure) ---------- */

.frame {
  background: var(--frame);
  border-radius: var(--radius);
  padding: 10px;
  box-shadow: var(--shadow-md);
}

.frame video, .frame img {
  border-radius: calc(var(--radius) - 6px);
  width: 100%;
}

.hero-video { max-width: 880px; margin: 0 auto; }

.caption {
  margin-top: 14px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

/* ---------- why cards ---------- */

.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.why-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  box-shadow: var(--shadow-sm);
}

.why-card .mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.why-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.why-card p {
  color: var(--ink-soft);
  font-size: 0.96rem;
  margin: 0;
}

/* ---------- method flow ---------- */

.flow {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 32px;
  font-size: 0.92rem;
}

.flow .step {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 16px;
  color: var(--ink);
  font-weight: 600;
  white-space: nowrap;
}

.flow .arrow { color: var(--ink-faint); font-size: 1rem; }

.note-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  margin-top: 32px;
  max-width: 880px;
  margin-left: auto;
  margin-right: auto;
}

.note-row .note h4 {
  font-size: 0.95rem;
  margin: 0 0 6px;
  color: var(--ink);
}

.note-row .note p {
  margin: 0;
  font-size: 0.94rem;
  color: var(--ink-soft);
}

/* ---------- results cards ---------- */

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.metric-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.metric-card .num {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.1;
  margin-bottom: 8px;
}

.metric-card .label {
  font-size: 0.9rem;
  color: var(--ink-soft);
}

/* ---------- experiment videos ---------- */

.video-subhead {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 44px 0 20px;
}

.video-subhead:first-of-type { margin-top: 8px; }

.video-subhead h3 {
  font-size: 1.05rem;
}

.pill {
  display: inline-block;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 4px 11px;
}

.exp-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px 24px;
}

.exp-item .frame { padding: 7px; }

.exp-item .caption {
  text-align: left;
  margin-top: 12px;
  font-size: 0.94rem;
}

/* ---------- prompt card ---------- */

.prompt-card {
  max-width: 760px;
  margin: 0 auto 36px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 22px 24px;
  box-shadow: var(--shadow-sm);
}

.prompt-card .prompt-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 10px;
}

.prompt-card p {
  margin: 0;
  font-size: 1rem;
  color: var(--ink);
}

.readout-note {
  max-width: 760px;
  margin: 0 auto 40px;
  color: var(--ink-soft);
  font-size: 0.97rem;
}

/* ---------- tables ---------- */

.table-wrap {
  max-width: 900px;
  margin: 0 auto;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

table.compare {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  background: var(--bg);
}

table.compare th, table.compare td {
  text-align: left;
  padding: 13px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

table.compare th {
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 700;
  background: var(--bg-soft);
}

table.compare tr:last-child td { border-bottom: none; }

table.compare td.status-selected {
  color: var(--accent-dark);
  font-weight: 700;
}

.table-note {
  max-width: 900px;
  margin: 18px auto 0;
  color: var(--ink-soft);
  font-size: 0.94rem;
}

.figure-block { max-width: 900px; margin: 0 auto 36px; }
.figure-block.wide { max-width: var(--max); }

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

footer {
  padding: 34px 0;
  text-align: center;
  color: var(--ink-faint);
  font-size: 0.86rem;
}

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

@media (max-width: 860px) {
  .why-grid { grid-template-columns: 1fr; }
  .metric-grid { grid-template-columns: 1fr 1fr; }
  .exp-grid { grid-template-columns: 1fr; }
  .note-row { grid-template-columns: 1fr; }
  section { padding: 56px 0; }
  .hero { padding: 64px 0 40px; }
}

@media (max-width: 480px) {
  .metric-grid { grid-template-columns: 1fr; }
  .wrap { padding: 0 18px; }
}