:root {
  --bg: #ffffff;
  --bg-soft: #f9fafb;
  --bg-subtle: #f3f4f6;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --accent: #059669;
  --accent-soft: #ecfdf5;
  --accent-mid: #a7f3d0;
  --warn: #f59e0b;
  --blue: #3b82f6;
  --mono: "IBM Plex Mono", monospace;
  --sans: "Space Grotesk", sans-serif;
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
code {
  font-family: var(--mono);
  font-size: .88em;
  background: var(--bg-subtle);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
  border: 1px solid var(--border);
}

/* ── Shell ── */
.shell { max-width: 1200px; margin: 0 auto; padding: 0 40px; }

/* ── Nav ── */
.topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.topbar-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 32px;
  display: flex; justify-content: space-between; align-items: center;
  height: 60px; gap: 32px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--text); color: #fff;
  display: grid; place-items: center;
  font-size: .75rem; font-weight: 700; letter-spacing: .04em;
}
.brand-name { font-weight: 700; font-size: .95rem; }
.topbar-links { display: flex; gap: 28px; align-items: center; }
.topbar-links a {
  font-size: .88rem; color: var(--muted);
  transition: color .15s;
}
.topbar-links a:hover { color: var(--text); }
.topbar-cta {
  padding: 8px 18px; border-radius: 999px;
  background: var(--text); color: #fff;
  font-size: .85rem; font-weight: 600;
  transition: opacity .15s;
}
.topbar-cta:hover { opacity: .82; }

/* ── Hero ── */
.hero {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--border);
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  margin-bottom: 16px;
  font-family: var(--mono); font-size: .78rem;
  color: var(--muted); letter-spacing: .04em;
}
.eyebrow-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); flex-shrink: 0;
}
.hero h1 {
  font-size: clamp(2.2rem, 4.5vw, 4rem);
  line-height: 1.08; letter-spacing: -.03em;
  max-width: 100%; margin-bottom: 16px;
}
.hero h1 em { font-style: normal; }
.hero-team {
  margin: 24px 0 28px;
  padding: 20px 24px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  display: block;
  max-width: 780px;
}
.team-role {
  font-family: var(--mono); font-size: .72rem;
  font-weight: 600; letter-spacing: .1em;
  color: var(--accent); text-transform: uppercase;
  margin-bottom: 16px; display: flex; align-items: center; gap: 8px;
}
.team-role::after {
  content: ''; flex: 1; height: 1px; background: var(--border);
}
.team-group {
  padding: 7px 0;
  border-bottom: 1px solid var(--bg-subtle);
}
.team-group:last-child { border-bottom: none; padding-bottom: 0; }
.team-group:first-of-type { padding-top: 0; }
.team-section-label {
  font-size: .70rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: .06em; color: var(--muted);
  display: block; margin-bottom: 4px;
}
.team-note {
  font-weight: 400; font-style: italic;
  text-transform: none; letter-spacing: 0;
}
.team-line {
  font-size: .90rem; color: var(--text); line-height: 1.6;
}
.team-member { font-weight: 600; }
.team-sep { color: var(--border-strong); }
.member-affil {
  font-size: .80rem; color: var(--muted);
  font-weight: 400; font-family: var(--mono);
}
.team-institutions .team-line {
  font-size: .82rem; color: var(--muted); font-weight: 400;
}

.hero-sub {
  font-size: 1.08rem; color: var(--muted);
  max-width: 60ch; line-height: 1.75;
  margin-bottom: 24px;
}
.hero-metrics {
  display: flex; gap: 48px; flex-wrap: wrap;
  padding: 24px 0; border-top: 1px solid var(--border);
}
.hero-metric-val {
  display: block; font-size: 2rem; font-weight: 700;
  letter-spacing: -.03em;
}
.hero-metric-label {
  display: block; font-size: .85rem; color: var(--muted); margin-top: 4px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 24px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: 999px;
  font-size: .9rem; font-weight: 600; transition: all .15s;
  cursor: pointer;
}
.btn-primary {
  background: var(--text); color: #fff;
}
.btn-primary:hover { opacity: .82; }
.btn-secondary {
  background: transparent; color: var(--text);
  border: 1.5px solid var(--border-strong);
}
.btn-secondary:hover { border-color: var(--text); }

/* ── Sections ── */
.section { padding: 56px 0; border-bottom: 1px solid var(--border); }
.section:last-child { border-bottom: none; }
.section-label {
  font-family: var(--mono); font-size: .75rem;
  color: var(--muted); text-transform: uppercase; letter-spacing: .08em;
  margin-bottom: 8px; display: block;
}
.section h2 {
  font-size: clamp(1.6rem, 2.8vw, 2.4rem);
  letter-spacing: -.025em; line-height: 1.1;
  margin-bottom: 24px;
}
.section-sub {
  font-size: 1rem; color: var(--muted); max-width: 60ch; line-height: 1.7;
  margin-bottom: 28px;
}

/* ── Pipeline steps ── */
.pipeline-steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0,1fr));
  gap: 1px; background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--r-lg); overflow: hidden;
  margin-bottom: 40px;
}
.pipe-step {
  background: var(--bg); padding: 28px 20px;
}
.pipe-step.highlight { background: var(--accent-soft); }
.pipe-num {
  font-family: var(--mono); font-size: .75rem;
  color: var(--accent); margin-bottom: 12px; display: block;
}
.pipe-step h4 { font-size: .95rem; margin-bottom: 8px; }
.pipe-step p { font-size: .85rem; color: var(--muted); line-height: 1.6; }

/* ── Two col ── */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.card {
  padding: 28px; border-radius: var(--r-lg);
  border: 1px solid var(--border); background: var(--bg);
}
.card h3 { font-size: 1rem; margin-bottom: 10px; }
.card p { font-size: .9rem; color: var(--muted); line-height: 1.7; }
.card p + p { margin-top: 10px; }
.card-accent { background: var(--accent-soft); border-color: var(--accent-mid); }

/* ── Stats row ── */
.stats-row {
  display: grid; grid-template-columns: repeat(4, minmax(0,1fr));
  gap: 1px; background: var(--border);
  border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden;
}
.stat-item { background: var(--bg); padding: 32px 24px; }
.stat-val { font-size: 2rem; font-weight: 700; letter-spacing: -.03em; display: block; }
.stat-desc { font-size: .85rem; color: var(--muted); margin-top: 6px; line-height: 1.5; display: block; }

/* ── Status columns ── */
.status-cols { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.status-col { padding: 28px; border-radius: var(--r-lg); border: 1px solid var(--border); }
.status-col.done { border-color: var(--accent-mid); background: var(--accent-soft); }
.status-col.progress { border-color: #fde68a; background: #fffbeb; }
.status-col.open { border-color: #bfdbfe; background: #eff6ff; }
.status-tag {
  display: inline-block; font-family: var(--mono); font-size: .72rem;
  padding: 4px 10px; border-radius: 999px; background: rgba(0,0,0,.06);
  letter-spacing: .04em; margin-bottom: 12px;
}
.status-col h3 { font-size: .95rem; margin-bottom: 12px; }
.bullet-list { padding-left: 18px; color: var(--muted); font-size: .88rem; line-height: 1.85; }

/* ── Demo section ── */
.demo-header {
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 24px; margin-bottom: 32px; flex-wrap: wrap;
}
.demo-note {
  font-size: .88rem; color: var(--muted); max-width: 52ch; line-height: 1.65;
}

/* Tab bar */
.tab-bar {
  display: flex; gap: 0;
  border-bottom: 1px solid var(--border); margin-bottom: 32px;
  overflow-x: auto;
}
.tab-btn {
  padding: 12px 20px; font-family: var(--mono); font-size: .78rem;
  color: var(--muted); background: transparent; border: none;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
  cursor: pointer; white-space: nowrap; transition: all .15s;
  appearance: none;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--text); border-bottom-color: var(--text); font-weight: 600; }

/* Tab panels */
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.tab-case-head {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 24px; margin-bottom: 24px; flex-wrap: wrap;
}
.tab-case-head h3 { font-size: 1.1rem; margin-bottom: 6px; }
.tab-case-head p { font-size: .88rem; color: var(--muted); max-width: 72ch; line-height: 1.65; }
.role-badge {
  flex-shrink: 0; padding: 6px 14px; border-radius: 999px;
  font-family: var(--mono); font-size: .74rem;
  background: var(--bg-subtle); border: 1px solid var(--border);
  color: var(--muted); white-space: nowrap;
}

.demo-board {
  display: flex; flex-direction: column; gap: 56px;
  width: calc(100vw - 80px);
  max-width: 1600px;
  margin-left: 50%; transform: translateX(-50%);
}
.demo-row-head {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 24px; margin-bottom: 16px; flex-wrap: wrap;
}
.demo-row-head h3 { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.demo-row-head p { font-size: .85rem; color: var(--muted); max-width: 72ch; line-height: 1.6; }

/* ── Accordion cards ── */
.demo-grid { display: flex; gap: 8px; height: 440px; }

.demo-card {
  flex: 0 0 36px; min-width: 0;
  border: 1px solid var(--border); border-radius: var(--r-lg);
  overflow: hidden; cursor: pointer; position: relative;
  transition: flex .4s cubic-bezier(.4,0,.2,1), border-color .2s;
  background: #0d1117;
}
.demo-card:hover:not(.active) { flex: 0 0 46px; border-color: var(--border-strong); }
.demo-card.active { flex: 1; cursor: default; border-color: var(--border-strong); }

/* collapsed */
.card-collapsed {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 12px;
  transition: opacity .2s;
}
.demo-card.active .card-collapsed { opacity: 0; pointer-events: none; }
.card-collapsed-label {
  writing-mode: vertical-rl; text-orientation: mixed;
  color: rgba(255,255,255,.8); font-size: .78rem; font-weight: 600;
  letter-spacing: .03em;
}
.card-collapsed-chip {
  writing-mode: vertical-rl;
  font-family: var(--mono); font-size: .62rem;
  color: rgba(255,255,255,.35); letter-spacing: .06em; text-transform: uppercase;
}

/* expanded */
.card-expanded {
  display: flex; flex-direction: row; height: 100%;
  opacity: 0; pointer-events: none; transition: opacity .2s .2s;
}
.demo-card.active .card-expanded { opacity: 1; pointer-events: auto; }

.card-preview {
  flex: 1; height: 100%;
  background: #0d1117; position: relative; overflow: hidden;
}
.card-preview iframe {
  position: absolute; width: 800px; height: 500px; border: none;
  top: 0; pointer-events: none;
  transform-origin: top left;
}
.play-btn {
  position: absolute; bottom: 10px; left: 50%; transform: translateX(-50%);
  z-index: 2; padding: 7px 20px; border-radius: 999px;
  background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.3);
  color: #fff; font-family: var(--mono); font-size: .76rem; font-weight: 500;
  backdrop-filter: blur(8px); white-space: nowrap; transition: background .15s;
}
.play-btn:hover { background: rgba(255,255,255,.28); }

.card-info {
  flex: 0 0 280px; padding: 16px; overflow-y: auto;
  display: flex; flex-direction: column; gap: 10px;
  background: var(--bg);
}
.card-info-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.stage-chip {
  font-family: var(--mono); font-size: .7rem; color: var(--muted);
  padding: 3px 8px; border-radius: 999px; flex-shrink: 0;
  background: var(--bg-subtle); border: 1px solid var(--border);
}
.stage-chip[data-chip="final"] {
  background: var(--accent-soft); color: var(--accent); border-color: var(--accent-mid);
}
.demo-game-name { font-size: .9rem; font-weight: 700; color: var(--text); }
.demo-delta { font-size: .8rem; color: var(--muted); line-height: 1.5; }
.demo-mechanics { display: flex; flex-wrap: wrap; gap: 4px; }
.token {
  display: inline-flex; align-items: center; padding: 2px 8px; border-radius: 999px;
  font-size: .72rem; background: var(--bg-subtle); border: 1px solid var(--border); color: var(--muted);
}
.token.status { color: var(--accent); border-color: var(--accent-mid); background: var(--accent-soft); }
.scores { display: grid; grid-template-columns: repeat(3,1fr); gap: 6px; }
.score-box {
  padding: 10px; border-radius: var(--r-sm);
  border: 1px solid var(--border); background: var(--bg-soft); text-align: center;
}
.score-label {
  display: block; font-family: var(--mono); font-size: .6rem;
  text-transform: uppercase; letter-spacing: .04em; color: var(--muted); margin-bottom: 2px;
}
.score-value { display: block; font-size: .95rem; font-weight: 700; color: var(--text); }

.card-note-list {
  padding-left: 16px; margin: 0;
  display: flex; flex-direction: column; gap: 5px;
}
.card-note-list li {
  font-size: .78rem; color: var(--muted); line-height: 1.5; list-style: disc;
}

/* ── Future work card ── */
.future-card {
  padding: 40px; border-radius: var(--r-lg);
  border: 1px solid var(--border); background: var(--bg-soft);
  margin-bottom: 28px;
}
.future-card p { color: var(--muted); line-height: 1.75; font-size: .97rem; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.tag {
  padding: 6px 14px; border-radius: 999px; font-family: var(--mono);
  font-size: .75rem; background: var(--bg-subtle);
  border: 1px solid var(--border); color: var(--muted);
}

/* ── Footer ── */
.footer {
  padding: 40px 0; border-top: 1px solid var(--border);
}
.footer-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 32px;
  display: flex; justify-content: space-between; align-items: center;
  gap: 24px; flex-wrap: wrap;
}
.footer-copy { font-size: .85rem; color: var(--muted); }
.footer-links { display: flex; gap: 24px; }
.footer-links a { font-size: .85rem; color: var(--muted); transition: color .15s; }
.footer-links a:hover { color: var(--text); }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .pipeline-steps { grid-template-columns: 1fr 1fr; }
  .demo-grid { grid-template-columns: repeat(2,1fr); }
  .stats-row { grid-template-columns: repeat(2,1fr); }
  .status-cols { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .shell { padding: 0 20px; }
  .topbar-inner { padding: 0 20px; }
  .topbar-links { display: none; }
  .hero { padding: 64px 0 56px; }
  .hero-metrics { gap: 28px; }
  .two-col { grid-template-columns: 1fr; }
  .demo-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr; }
  .pipeline-steps { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}