/* Formation Trainer — marketing site
   Shares the app's "coach's board" identity: chalk on a deep green board,
   Jost for display/UI, IBM Plex Mono for labels. Amber is reserved for the
   motion-tell accent and used sparingly. */

:root {
  --board-top: #1C3A2E;
  --board-base: #12271E;
  --board-deep: #0F221B;
  --chalk: #E8E4D8;
  --chalk-dim: rgba(232, 228, 216, 0.55);
  --chalk-faint: rgba(232, 228, 216, 0.16);
  --sage: #7FB08A;
  --amber: #F4A340;
  --maxw: 920px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 50% -10%, rgba(127, 176, 138, 0.06), transparent 60%),
    linear-gradient(170deg, var(--board-top), var(--board-base));
  background-attachment: fixed;
  color: var(--chalk);
  font-family: "Jost", "Helvetica Neue", Arial, sans-serif;
  font-weight: 300;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* Header */
header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(18, 39, 30, 0.82);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--chalk-faint);
}
.nav { display: flex; align-items: center; gap: 14px; height: 64px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--chalk); }
.brand svg { width: 34px; height: 34px; display: block; }
.brand .wordmark {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 13px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--chalk);
}
.nav .spacer { flex: 1; }
.nav a.link {
  color: var(--chalk-dim); text-decoration: none; font-size: 15px;
  padding: 6px 10px; border-radius: 8px; transition: color 0.15s, background 0.15s;
}
.nav a.link:hover { color: var(--chalk); background: rgba(232, 228, 216, 0.06); }

/* Hero */
.hero { text-align: center; padding: 72px 0 40px; }
.hero .mark svg { width: 132px; height: 132px; }
.hero h1 {
  font-family: "Jost", sans-serif; font-weight: 400;
  font-size: clamp(34px, 6vw, 56px); line-height: 1.05; letter-spacing: -0.01em;
  margin: 22px 0 14px;
}
.hero p.sub {
  color: var(--chalk-dim); font-size: clamp(16px, 2.4vw, 20px);
  max-width: 560px; margin: 0 auto 28px;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: "Jost", sans-serif; font-weight: 400; font-size: 16px;
  color: var(--chalk); text-decoration: none;
  padding: 13px 22px; border-radius: 10px;
  border: 1px solid rgba(232, 228, 216, 0.5);
  background: rgba(232, 228, 216, 0.06);
  transition: background 0.15s, transform 0.05s;
}
.btn:hover { background: rgba(232, 228, 216, 0.12); }
.btn:active { transform: translateY(1px); }
.btn.ghost { border-color: var(--chalk-faint); background: transparent; }
.badge-note {
  display: block; margin-top: 14px;
  font-family: "IBM Plex Mono", monospace; font-size: 11px;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--chalk-dim);
}

/* Feature grid */
.section { padding: 40px 0; }
.eyebrow {
  font-family: "IBM Plex Mono", monospace; font-size: 12px;
  letter-spacing: 0.2em; text-transform: uppercase; color: var(--chalk-dim);
  text-align: center; margin-bottom: 8px;
}
.section h2 {
  font-weight: 400; font-size: clamp(24px, 4vw, 34px);
  text-align: center; margin: 0 0 36px;
}
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
  background: var(--board-deep);
  border: 1px solid var(--chalk-faint);
  border-radius: 16px; padding: 22px;
}
.card .ico { color: var(--sage); margin-bottom: 12px; }
.card .ico svg { width: 26px; height: 26px; display: block; }
.card h3 { font-weight: 500; font-size: 19px; margin: 0 0 6px; }
.card p { color: var(--chalk-dim); font-size: 15px; margin: 0; }

/* Diagram strip */
.board-panel {
  background: var(--board-deep);
  border: 1px solid var(--chalk-faint);
  border-radius: 20px; padding: 8px; margin: 8px 0 0;
}
.board-panel svg { width: 100%; height: auto; display: block; border-radius: 14px; }
.caption {
  text-align: center; color: var(--chalk-dim); font-size: 14px; margin-top: 14px;
}
.caption .tell { color: var(--amber); font-family: "IBM Plex Mono", monospace;
  font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; }

/* Content pages (privacy / support) */
.doc { padding: 48px 0 24px; max-width: 720px; }
.doc h1 { font-weight: 400; font-size: clamp(28px, 5vw, 40px); margin: 0 0 6px; }
.doc .meta {
  font-family: "IBM Plex Mono", monospace; font-size: 12px;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--chalk-dim);
  margin-bottom: 28px;
}
.doc h2 {
  font-weight: 500; font-size: 20px; margin: 32px 0 8px;
  padding-top: 8px;
}
.doc p, .doc li { color: var(--chalk); font-size: 16px; }
.doc p { margin: 0 0 14px; }
.doc a { color: var(--sage); }
.doc ul { padding-left: 20px; }
.doc li { margin-bottom: 8px; }
.doc .lead { color: var(--chalk-dim); font-size: 18px; }
.divider { height: 1px; background: var(--chalk-faint); border: 0; margin: 28px 0; }

/* Footer */
footer { border-top: 1px solid var(--chalk-faint); margin-top: 48px; padding: 28px 0 48px; }
.foot { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.foot .spacer { flex: 1; }
.foot a { color: var(--chalk-dim); text-decoration: none; font-size: 14px; }
.foot a:hover { color: var(--chalk); }
.foot .copy {
  font-family: "IBM Plex Mono", monospace; font-size: 12px;
  letter-spacing: 0.1em; color: var(--chalk-dim);
}

@media (max-width: 680px) {
  .grid { grid-template-columns: 1fr; }
  .nav a.link.hide-sm { display: none; }
}