/* Project 2x250 brand site. Design tokens carried over verbatim from the Ledger
   app (app/web/src/theme.css) so the umbrella site and the app read as one brand.
   Brand navy #1f5fa8, light + dark via prefers-color-scheme. */

:root {
  --page: #f7f9fb;
  --surface: #ffffff;
  --ink: #16202b;      /* primary text */
  --ink-2: #5a6775;    /* secondary text */
  --ink-3: #8a95a3;    /* muted */
  --line: #e3e8ee;     /* hairline */
  --navy: #1f5fa8;     /* brand */
  --navy-ink: #1a5397; /* brand text on light (AA on --page) */
  --navy-soft: #eaf1f9;/* navy wash */
  --orange: #eb6834;   /* accent (matches app "trail goes cold" marker) */
  --shadow: 0 1px 2px rgba(16, 32, 43, 0.05), 0 4px 16px rgba(16, 32, 43, 0.04);
  --shadow-lg: 0 2px 4px rgba(16, 32, 43, 0.06), 0 12px 40px rgba(16, 32, 43, 0.08);

  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --radius: 12px;
  --maxw: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #0a0f16;
    --surface: #0e1621;
    --ink: #f5f7fa;
    --ink-2: #9fb0c0;
    --ink-3: #6b7a8a;
    --line: #1e2a38;
    --navy: #4a90e2;
    --navy-ink: #7cb0ec;
    --navy-soft: #16273b;
    --orange: #d95926;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 2px 4px rgba(0, 0, 0, 0.35), 0 12px 40px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

a { color: var(--navy-ink); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.num { font-variant-numeric: tabular-nums; }

/* Top nav ------------------------------------------------------------------ */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--page) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.brand { display: flex; align-items: baseline; gap: 9px; text-decoration: none; }
.brand .mark { font-size: 19px; font-weight: 700; letter-spacing: -0.01em; color: var(--navy-ink); }
.brand .mark b { color: var(--orange); font-weight: 700; }
.brand .sub { font-size: 12px; color: var(--ink-3); }
@media (max-width: 560px) { .brand .sub { display: none; } }
.nav-spacer { flex: 1 1 auto; }
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-link {
  font-size: 14px; font-weight: 600; color: var(--ink-2);
  text-decoration: none; padding: 7px 12px; border-radius: 8px;
}
.nav-link:hover { color: var(--ink); background: var(--navy-soft); }
.nav-link.here { color: var(--navy-ink); }

/* Buttons ------------------------------------------------------------------ */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: inherit; font-size: 15px; font-weight: 600;
  padding: 11px 20px; border-radius: 10px; border: 1px solid transparent;
  text-decoration: none; cursor: pointer; white-space: nowrap;
  transition: transform 0.08s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--navy); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { box-shadow: var(--shadow-lg); }
.btn-ghost { background: var(--surface); color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--navy); color: var(--navy-ink); }
.btn-sm { font-size: 14px; padding: 8px 14px; }
.nav .btn-sm { box-shadow: none; }

/* Hero --------------------------------------------------------------------- */
.hero { padding: 74px 0 20px; }
.eyebrow {
  font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--navy-ink); margin: 0 0 16px;
}
.hero h1 {
  font-size: clamp(34px, 6vw, 56px); line-height: 1.06; letter-spacing: -0.025em;
  font-weight: 800; margin: 0 0 22px; max-width: 16ch;
}
.hero .lead { font-size: clamp(17px, 2.4vw, 20px); color: var(--ink-2); margin: 0 0 30px; max-width: 62ch; }
.hero .lead b { color: var(--ink); font-weight: 600; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* Section scaffolding ------------------------------------------------------ */
.section { padding: 46px 0; }
.section-eyebrow {
  font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--ink-3); margin: 0 0 10px;
}
.section h2 { font-size: clamp(24px, 4vw, 32px); letter-spacing: -0.02em; font-weight: 750; margin: 0 0 14px; }
.section .section-lead { font-size: 17px; color: var(--ink-2); margin: 0 0 28px; max-width: 60ch; }

.rule { border: none; border-top: 1px solid var(--line); margin: 0; }

/* Feature card (Ledger spotlight) ----------------------------------------- */
.spotlight {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 34px 32px;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 32px;
  align-items: center;
}
@media (max-width: 760px) { .spotlight { grid-template-columns: 1fr; gap: 24px; padding: 26px 22px; } }
.spotlight .tool-tag {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--navy-ink); background: var(--navy-soft);
  padding: 4px 11px; border-radius: 999px; margin-bottom: 14px;
}
.spotlight h3 { font-size: 26px; letter-spacing: -0.015em; margin: 0 0 12px; }
.spotlight p { color: var(--ink-2); margin: 0 0 20px; font-size: 16px; }
.spotlight .stat-strip { display: grid; gap: 14px; }
.spotlight .stat {
  border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; background: var(--page);
}
.spotlight .stat .v { font-size: 24px; font-weight: 750; letter-spacing: -0.02em; }
.spotlight .stat .k { font-size: 13px; color: var(--ink-3); margin-top: 2px; }

/* Principles grid ---------------------------------------------------------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 760px) { .grid-3 { grid-template-columns: 1fr; } }
.pcard {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px 22px;
}
.pcard .pico {
  width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center;
  background: var(--navy-soft); color: var(--navy-ink); margin-bottom: 14px;
}
.pcard .pico svg { width: 20px; height: 20px; }
.pcard h3 { font-size: 17px; margin: 0 0 7px; letter-spacing: -0.01em; }
.pcard p { font-size: 14.5px; color: var(--ink-2); margin: 0; }

/* Articles ----------------------------------------------------------------- */
.articles-list { display: grid; gap: 16px; }
.acard {
  display: grid; grid-template-columns: 148px 1fr; gap: 22px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  overflow: hidden; text-decoration: none; color: inherit;
  transition: transform 0.1s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.acard:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--navy); }
.acard .thumb {
  background: var(--navy-soft) center/cover no-repeat;
  min-height: 130px; align-self: stretch;
}
.acard .body { padding: 20px 22px 20px 0; }
.acard .adate { font-size: 12.5px; font-weight: 600; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.03em; }
.acard h3 { font-size: 19px; line-height: 1.25; letter-spacing: -0.015em; margin: 6px 0 8px; }
.acard p { font-size: 14.5px; color: var(--ink-2); margin: 0 0 12px; }
.acard .more { font-size: 14px; font-weight: 600; color: var(--navy-ink); }
@media (max-width: 560px) {
  .acard { grid-template-columns: 1fr; }
  .acard .thumb { min-height: 150px; }
  .acard .body { padding: 0 20px 20px; }
}
.articles-note { font-size: 13px; color: var(--ink-3); margin-top: 18px; }
.loading { color: var(--ink-3); font-size: 15px; padding: 30px 4px; }

/* Subscribe band ----------------------------------------------------------- */
.band {
  background: var(--navy-soft); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 32px 30px; text-align: center;
}
.band h2 { font-size: 24px; letter-spacing: -0.02em; margin: 0 0 8px; }
.band p { color: var(--ink-2); margin: 0 0 20px; max-width: 52ch; margin-left: auto; margin-right: auto; }

/* Footer ------------------------------------------------------------------- */
.footer { border-top: 1px solid var(--line); margin-top: 40px; padding: 34px 0 48px; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 20px 40px; justify-content: space-between; }
.footer .fbrand .mark { font-size: 17px; font-weight: 700; color: var(--navy-ink); }
.footer .fbrand .mark b { color: var(--orange); }
.footer .fbrand p { font-size: 13.5px; color: var(--ink-3); margin: 6px 0 0; max-width: 40ch; }
.footer-cols { display: flex; gap: 44px; flex-wrap: wrap; }
.footer-col h4 { font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-3); margin: 0 0 10px; }
.footer-col a { display: block; font-size: 14px; color: var(--ink-2); text-decoration: none; margin-bottom: 7px; }
.footer-col a:hover { color: var(--navy-ink); }
.footer-fine { font-size: 12.5px; color: var(--ink-3); margin-top: 26px; }