/* ═══════════════════════════════════════════════════════════════
   twin3.ai — shared stylesheet (SPEC.md §9 brand tokens)
   Static site · no build step · every page links this one file.
   ═══════════════════════════════════════════════════════════════ */

:root {
  /* Brand tokens (SPEC §9 — do not invent new hues) */
  --forest:       #1a2e1f;   /* page background */
  --forest-deep:  #122116;   /* footer / alt sections */
  --forest-soft:  #24402c;   /* card / panel surface */
  --cream:        #f0ede0;   /* primary text */
  --cream-soft:   rgba(240, 237, 224, 0.72);
  --cream-mute:   rgba(240, 237, 224, 0.45);
  --mint:         #7ddc8c;   /* xHuman ID accent */
  --amber:        #ff9a3c;   /* xAgent ID accent */
  --line:         rgba(240, 237, 224, 0.14);
  --line-soft:    rgba(240, 237, 224, 0.08);

  --font-serif: "EB Garamond", Georgia, "Times New Roman", serif;
  --font-body:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono:  "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --maxw: 1120px;
  --radius: 14px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--forest);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3 { font-family: var(--font-serif); font-weight: 600; line-height: 1.18; margin: 0 0 0.5em; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.4rem, 5.6vw, 4rem); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); }
h3 { font-size: 1.25rem; }
p  { margin: 0 0 1em; color: var(--cream-soft); }
a  { color: var(--mint); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; height: auto; }

.mono-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cream-mute);
}
.accent-mint  { color: var(--mint); }
.accent-amber { color: var(--amber); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
section { padding: 88px 0; }
@media (max-width: 720px) { section { padding: 56px 0; } }

/* ── Nav ─────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(26, 46, 31, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  height: 64px; display: flex; align-items: center; gap: 28px;
}
.nav-logo {
  font-family: var(--font-serif); font-size: 1.35rem; font-weight: 700;
  color: var(--cream); letter-spacing: -0.02em;
}
.nav-logo:hover { text-decoration: none; }
.nav-links { display: flex; gap: 24px; margin-left: auto; align-items: center; }
.nav-links a { color: var(--cream-soft); font-size: 0.92rem; white-space: nowrap; }
.nav-links a:hover { color: var(--cream); text-decoration: none; }
.nav-links a.active { color: var(--cream); }
.nav-cta {
  background: var(--mint); color: var(--forest) !important;
  padding: 9px 18px; border-radius: 999px; font-weight: 600; font-size: 0.88rem;
}
.nav-cta:hover { filter: brightness(1.07); text-decoration: none; }
@media (max-width: 720px) {
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 0.8rem; }
  .nav-links a.nav-hide-sm { display: none; }
}

/* ── Buttons ─────────────────────────────────────────── */
.btn {
  display: inline-block; padding: 13px 26px; border-radius: 999px;
  font-weight: 600; font-size: 0.95rem; border: 1px solid transparent;
  cursor: pointer; transition: filter 0.15s ease, background 0.15s ease;
}
.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn-mint  { background: var(--mint);  color: var(--forest); }
.btn-amber { background: var(--amber); color: var(--forest); }
.btn-ghost { background: transparent; color: var(--cream); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--cream-soft); }

/* ── Cards / panels ──────────────────────────────────── */
.card {
  background: var(--forest-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 32px;
}
.card-mint  { border-top: 3px solid var(--mint); }
.card-amber { border-top: 3px solid var(--amber); }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 860px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

/* ── Hero ────────────────────────────────────────────── */
.hero { padding: 110px 0 70px; text-align: center; }
.hero .hero-sub {
  font-size: clamp(1.02rem, 2vw, 1.2rem);
  max-width: 620px; margin: 0 auto 2rem;
}
.hero-ctas { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 2.6rem; }
.hero-stats { display: flex; gap: 44px; justify-content: center; flex-wrap: wrap; }
.hero-stat .stat-value {
  font-family: var(--font-serif); font-size: 1.9rem; font-weight: 700; color: var(--cream);
}
.hero-stat .stat-label { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--cream-mute); }
@media (max-width: 720px) { .hero { padding: 70px 0 50px; } .hero-stats { gap: 26px; } }

/* ── Section headers ─────────────────────────────────── */
.sec-head { text-align: center; max-width: 640px; margin: 0 auto 52px; }
.sec-head .mono-label { display: block; margin-bottom: 12px; }

/* ── Steps (how it works) ────────────────────────────── */
.step-num {
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--forest);
  width: 30px; height: 30px; border-radius: 50%; display: inline-flex;
  align-items: center; justify-content: center; margin-bottom: 14px; font-weight: 700;
}

/* ── Tables ──────────────────────────────────────────── */
.table-scroll { overflow-x: auto; }
table.cmp { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
table.cmp th, table.cmp td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line-soft); }
table.cmp th { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--cream-mute); }
table.cmp td { color: var(--cream-soft); }
table.cmp td:first-child { color: var(--cream); }

/* ── TBD placeholder (SPEC §7 — Ming fills later) ────── */
.tbd {
  display: inline-block; font-family: var(--font-mono); font-size: 0.7rem;
  color: var(--cream-mute); border: 1px dashed var(--line);
  border-radius: 6px; padding: 2px 10px; letter-spacing: 0.06em;
}

/* ── Pricing cards ───────────────────────────────────── */
.price-card { display: flex; flex-direction: column; }
.price-card .price-tier { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 10px; }
.price-card .price-value { font-family: var(--font-serif); font-size: 2.3rem; font-weight: 700; color: var(--cream); margin-bottom: 4px; }
.price-card .price-period { font-size: 0.82rem; color: var(--cream-mute); margin-bottom: 20px; }
.price-card ul { list-style: none; margin: 0 0 26px; padding: 0; flex: 1; }
.price-card ul li { padding: 8px 0; border-bottom: 1px solid var(--line-soft); font-size: 0.92rem; color: var(--cream-soft); }
.price-card ul li:last-child { border-bottom: none; }
.price-featured { border-color: var(--mint); box-shadow: 0 0 0 1px var(--mint); }

/* ── Legal / prose pages ─────────────────────────────── */
.prose { max-width: 760px; margin: 0 auto; }
.prose h1 { font-size: clamp(2rem, 4vw, 2.8rem); }
.prose h2 { font-size: 1.35rem; margin-top: 2.2em; }
.prose ul { color: var(--cream-soft); padding-left: 1.3em; }
.prose li { margin-bottom: 0.4em; }
.prose .updated { font-family: var(--font-mono); font-size: 0.72rem; color: var(--cream-mute); letter-spacing: 0.08em; margin-bottom: 2.5rem; }

/* ── Footer ──────────────────────────────────────────── */
footer.site-footer {
  background: var(--forest-deep);
  border-top: 1px solid var(--line-soft);
  padding: 40px 0;
  font-size: 0.82rem; color: var(--cream-mute);
}
.footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; display: flex; flex-wrap: wrap; gap: 18px 28px; align-items: center; justify-content: space-between; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-links a { color: var(--cream-mute); }
.footer-links a:hover { color: var(--cream); }
.footer-reg { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.04em; line-height: 1.9; }

/* ── Bridge diagram ──────────────────────────────────── */
.bridge-wrap { margin: 0 auto; max-width: 900px; }
.bridge-beats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 40px; }
.bridge-beat .mono-label { display: block; margin-bottom: 8px; }
.bridge-beat p { font-size: 0.9rem; margin: 0; }
@media (max-width: 860px) { .bridge-beats { grid-template-columns: 1fr; } }

/* ── Utility ─────────────────────────────────────────── */
.center { text-align: center; }
.mt-0 { margin-top: 0; }
.section-alt { background: var(--forest-deep); }