/* BookForge landing page — dark forge look: warm near-black, ember-amber accent. */

:root {
  --night: #14110d;
  --night-deep: #0e0c09;
  --card: #1d1914;
  --parchment: #f1eadf;
  --parchment-soft: #b3a998;
  --ember: #e89044;
  --ember-hot: #f2a95c;
  --line: #2f2920;
  --radius: 10px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--night);
  color: var(--parchment);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

h2 {
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

a { color: var(--ember); }

/* ---- Top nav ---- */

.topnav {
  border-bottom: 1px solid var(--line);
  background: rgba(20, 17, 13, 0.92);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topnav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.brand { font-weight: 700; font-size: 1.15rem; letter-spacing: -0.01em; }
.brand-accent { color: var(--ember); }

.topnav-links { display: flex; align-items: center; gap: 1.5rem; }
.topnav-links a { color: var(--parchment-soft); text-decoration: none; font-size: 0.95rem; }
.topnav-links a:hover { color: var(--parchment); }

.nav-cta {
  background: var(--ember);
  color: var(--night-deep) !important;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 6px;
}
.nav-cta:hover { background: var(--ember-hot); }

/* ---- Hero ---- */

.hero {
  padding: 72px 0 88px;
  background:
    radial-gradient(60% 80% at 75% 20%, rgba(232, 144, 68, 0.10), transparent 70%),
    var(--night);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ember);
  margin-bottom: 0.9rem;
}

.hero h1 {
  font-size: 2.9rem;
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1.1rem;
}

.hero h1 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--ember) 20%, var(--ember-hot) 80%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero .sub {
  color: var(--parchment-soft);
  font-size: 1.08rem;
  margin-bottom: 2rem;
  max-width: 34rem;
}

/* ---- Download block ---- */

.btn {
  display: inline-block;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
}

.btn-primary {
  background: linear-gradient(100deg, var(--ember) 0%, var(--ember-hot) 100%);
  color: var(--night-deep);
  font-size: 1.05rem;
  padding: 13px 28px;
  box-shadow: 0 4px 18px rgba(232, 144, 68, 0.25);
}
.btn-primary:hover { filter: brightness(1.07); }

.platform-toggle {
  display: inline-flex;
  margin-left: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  vertical-align: middle;
}

.platform-btn {
  background: var(--card);
  color: var(--parchment-soft);
  border: none;
  padding: 10px 14px;
  font-size: 0.9rem;
  cursor: pointer;
}
.platform-btn + .platform-btn { border-left: 1px solid var(--line); }
.platform-btn:hover { color: var(--parchment); }
.platform-btn.active { background: var(--line); color: var(--parchment); font-weight: 600; }

.version { margin-top: 0.8rem; font-size: 0.9rem; color: var(--parchment-soft); }
.alt-asset { margin-left: 8px; font-size: 0.9rem; }
.all-releases { margin-top: 0.2rem; font-size: 0.9rem; }
.all-releases a { color: var(--parchment-soft); }
.all-releases a:hover { color: var(--ember); }

.privacy-tag { margin-top: 1.6rem; font-size: 0.88rem; color: var(--parchment-soft); }

/* ---- Carousel ---- */

.hero-shots { min-width: 0; }

.carousel {
  position: relative;
  aspect-ratio: 3 / 2;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  background: var(--card);
}

.carousel img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.6s ease;
}
.carousel img.active { opacity: 1; }

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 14px;
}

.carousel-dots button {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: none;
  background: var(--line);
  cursor: pointer;
  padding: 0;
}
.carousel-dots button.active { background: var(--ember); }

/* ---- Sections ---- */

.steps { padding: 72px 24px; }

.grid { display: grid; gap: 20px; }
.grid.two { grid-template-columns: 1fr 1fr; }
.grid.three { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.card p { color: var(--parchment-soft); font-size: 0.95rem; }

.card-num {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--ember);
  margin-bottom: 0.7rem;
}

.providers-band {
  background: var(--night-deep);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 72px 0;
}

.providers-band .card.plain { background: var(--card); }

.audience { padding: 72px 24px 88px; }

/* ---- Footer ---- */

.footer { border-top: 1px solid var(--line); padding: 28px 0; }

.footer-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.9rem;
}

.footer a { color: var(--parchment-soft); text-decoration: none; }
.footer a:hover { color: var(--ember); }
.copyright { margin-left: auto; color: var(--parchment-soft); }

/* ---- Responsive ---- */

@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero h1 { font-size: 2.3rem; }
  .grid.three, .grid.two { grid-template-columns: 1fr; }
  .platform-toggle { margin-left: 0; margin-top: 12px; display: flex; width: fit-content; }
}

@media (max-width: 520px) {
  /* GitHub/Releases live in the footer too; keep only the CTA up top. */
  .topnav-links a:not(.nav-cta) { display: none; }
}