/* =========================================================
   Landing page styles
   ========================================================= */

/* Nav */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 40px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(10,10,10,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 100;
}
.nav-brand {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
}
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 15px; font-weight: 600; }

/* Hero */
.hero {
  max-width: 780px;
  margin: 0 auto;
  padding: 100px 24px 80px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}
.hero-badge {
  display: inline-block;
  background: var(--bg-soft);
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 100px;
}
.hero-headline {
  margin: 0;
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.08;
  color: var(--text);
}
.hero-sub {
  margin: 0;
  font-size: 17px;
  color: var(--text-muted);
  max-width: 480px;
  line-height: 1.65;
}
.hero-actions { margin-top: 8px; }

/* Book mock animation */
.hero-visual { margin-top: 16px; }
.book-mock {
  position: relative;
  width: 180px;
  height: 240px;
  margin: 0 auto;
  perspective: 600px;
}
.book-page {
  position: absolute;
  border-radius: 2px 6px 6px 2px;
  border: 1px solid var(--border-strong);
}
.book-page-back {
  width: 164px;
  height: 224px;
  top: 12px;
  left: 16px;
  background: var(--bg-soft);
  transform: rotate(4deg);
}
.book-page-mid {
  width: 168px;
  height: 228px;
  top: 6px;
  left: 8px;
  background: var(--bg-elev);
  transform: rotate(1.5deg);
}
.book-page-front {
  width: 172px;
  height: 232px;
  top: 0;
  left: 0;
  background: var(--bg-elev);
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transform: rotate(0deg);
}
.page-line {
  height: 8px;
  background: var(--border-strong);
  border-radius: 4px;
  width: 100%;
}
.page-line-short { width: 55%; }
.page-line-med { width: 75%; }

/* Features */
.features {
  max-width: 1000px;
  margin: 0 auto;
  padding: 80px 24px;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.feature-card {
  background: var(--bg-elev);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background var(--transition);
}
.feature-card:hover { background: var(--bg-soft); }
.feature-icon {
  color: var(--text-muted);
  margin-bottom: 4px;
}
.feature-card h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}
.feature-card p {
  margin: 0;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* How it works */
.how {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 24px 100px;
  text-align: center;
}
.section-title {
  margin: 0 0 48px;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.03em;
}
.steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}
.step {
  flex: 1;
  min-width: 180px;
  max-width: 240px;
  padding: 0 20px;
  text-align: center;
}
.step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.step h4 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
}
.step p {
  margin: 0;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}
.step-arrow {
  color: var(--border-strong);
  padding-top: 18px;
  flex-shrink: 0;
}
.cta-row {
  margin-top: 56px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

/* Mobile */
@media (max-width: 640px) {
  .nav { padding: 16px 20px; }
  .hero { padding: 60px 20px 60px; }
  .step-arrow { display: none; }
  .steps { gap: 32px; }
  .step { max-width: 100%; }
}