/* Fulcrum GitHub Pages site. Dark, amber-accented, matching the app theme. */
:root {
  --bg: #0d0f12;
  --surface: #1a1e24;
  --raised: #222831;
  --border: #2c333d;
  --text: #e6e9ee;
  --muted: #9aa3af;
  --accent: #f59e0b;
  --accent-bright: #fbbf24;
  --maxw: 1120px;
  --radius: 14px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter,
    "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-bright); }
h1, h2, h3, h4 { line-height: 1.2; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

header.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(13, 15, 18, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  color: var(--text);
}
.brand img { width: 30px; height: 30px; }
.nav-links { display: flex; gap: 26px; align-items: center; }
.nav-links a { color: var(--muted); font-weight: 600; font-size: 15px; }
.nav-links a:hover { color: var(--accent-bright); }

.hero {
  position: relative;
  text-align: center;
  padding: 104px 0 80px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    58% 50% at 50% 0,
    rgba(245, 158, 11, 0.18),
    transparent 70%
  );
  pointer-events: none;
}
.hero .logo {
  width: 112px;
  height: 112px;
  margin-bottom: 22px;
  filter: drop-shadow(0 10px 34px rgba(245, 158, 11, 0.28));
}
.hero h1 {
  font-size: clamp(42px, 7vw, 70px);
  margin: 0;
  letter-spacing: -0.02em;
}
.tagline {
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-size: 13px;
  margin-top: 10px;
}
.lede {
  max-width: 640px;
  margin: 26px auto 0;
  color: var(--muted);
  font-size: 19px;
}
.cta {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin-top: 34px;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 10px;
  font-weight: 700;
  border: 2px solid transparent;
  transition: 0.15s ease;
}
.btn-primary { background: var(--accent); color: #0d0f12; }
.btn-primary:hover { background: var(--accent-bright); color: #0d0f12; }
.btn-ghost { border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-bright); }
.badges {
  margin-top: 24px;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.06em;
}
.badges span { margin: 0 10px; }
.release-note { margin-top: 16px; color: var(--muted); font-size: 14px; }

section { padding: 78px 0; }
section.alt {
  background: linear-gradient(180deg, rgba(26, 30, 36, 0.5), transparent);
}
.eyebrow {
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 13px;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(28px, 4vw, 36px);
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}
.section-sub {
  color: var(--muted);
  margin: 0 0 42px;
  max-width: none;
  font-size: 17px;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}
.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
}
.feature .fnum {
  color: var(--accent);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.1em;
}
.feature h3 { margin: 12px 0 8px; font-size: 18px; }
.feature p { margin: 0; color: var(--muted); font-size: 15px; }

.shots { display: grid; gap: 44px; }
.shot figure { margin: 0; }
.frame {
  background: var(--raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 28px 64px rgba(0, 0, 0, 0.5);
}
.frame .bar {
  display: flex;
  gap: 7px;
  padding: 12px 15px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.frame .bar i {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--border);
}
.frame img { display: block; width: 100%; height: auto; }
.shot figcaption {
  color: var(--muted);
  margin-top: 16px;
  font-size: 15px;
  max-width: 760px;
}
.shot figcaption b { color: var(--text); }

.books-intro {
  color: var(--muted);
  max-width: none;
  font-size: 17px;
  margin-bottom: 38px;
}
.featured {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 30px;
  align-items: center;
  background: linear-gradient(180deg, var(--surface), rgba(34, 40, 49, 0.35));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
  margin-bottom: 34px;
}
.featured img {
  width: 188px;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.55);
}
.featured .kicker {
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 12px;
}
.featured .meta h3 { margin: 8px 0; font-size: 26px; }
.featured .meta p { color: var(--muted); margin: 0 0 18px; font-size: 16px; }

.series {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(212px, 1fr));
  gap: 20px;
}
.book {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.book img {
  width: 132px;
  height: auto;
  border-radius: 5px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.5);
  margin-bottom: 18px;
}
.book h4 { margin: 0 0 8px; font-size: 16px; }
.book p { color: var(--muted); font-size: 14px; margin: 0 0 16px; flex: 1; }
.book .buy { font-weight: 700; font-size: 14px; }

footer {
  border-top: 1px solid var(--border);
  padding: 50px 0;
  color: var(--muted);
  font-size: 14px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  align-items: center;
}
.footer-inner strong { color: var(--text); }
.footer-links { display: flex; gap: 22px; flex-wrap: wrap; }

@media (max-width: 640px) {
  .featured {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
  }
  .nav-links { gap: 16px; }
  .nav-links a:nth-child(1),
  .nav-links a:nth-child(2) { display: none; }
}