/* ============================================================
   Lucky Day Landing Page — components.css (Part 2/2)
   Features Bento Grid, Differentiation, Footer, Scroll Reveal
   ============================================================ */

/* ── 10. Features Section (Bento Grid) ── */
.features { padding-block: var(--space-3xl); background-color: var(--bg-primary); }
.features-header { margin-bottom: var(--space-2xl); }
.features-header .overline { margin-bottom: var(--space-sm); }
.features-header h2 { margin-bottom: var(--space-md); }

.features-grid {
  display: grid; grid-template-columns: 1fr; gap: 16px;
}
@media (min-width: 768px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .feature-card:first-child { grid-column: span 2; }
}
@media (min-width: 1024px) {
  .features-grid { grid-template-columns: repeat(3, 1fr); gap: 24px; }
  .feature-card:first-child { grid-column: span 2; }
}

/* Feature Card Base */
.feature-card {
  position: relative;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px; overflow: hidden;
  transition: transform var(--duration-normal) var(--ease-out),
              background-color var(--duration-normal) ease,
              border-color var(--duration-normal) ease;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 16px; right: 16px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
  opacity: 0.4; transition: opacity var(--duration-normal) ease;
}
.feature-card:hover {
  transform: translateY(-4px); background: var(--bg-elevated);
  border-color: rgba(212, 168, 83, 0.35);
}
.feature-card:hover::before { opacity: 0.8; }
.feature-card:focus-within { border-color: var(--border-focus); outline: none; }

/* Featured card (BaZi spans 2 cols) */
.feature-card--featured { padding: 32px; }
@media (min-width: 1024px) { .feature-card--featured { padding: 40px; } }

.feature-card__icon {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  background: rgba(212, 168, 83, 0.1); border-radius: var(--radius-md);
  margin-bottom: var(--space-md); flex-shrink: 0;
}
.feature-card--featured .feature-card__icon { width: 48px; height: 48px; }
.feature-card__icon svg { width: 20px; height: 20px; stroke: var(--accent-gold); stroke-width: 1.5; fill: none; }
.feature-card--featured .feature-card__icon svg { width: 26px; height: 26px; }

.feature-card__subtitle {
  display: block; font-size: 0.75rem; font-weight: 400;
  color: var(--text-tertiary); margin-bottom: var(--space-xs); letter-spacing: 0.04em;
}
.feature-card__title { margin-bottom: var(--space-sm); }
.feature-card__desc {
  font-size: clamp(0.95rem, 0.88rem+0.3vw, 1.0625rem);
  line-height: 1.6; color: var(--text-secondary);
}
.feature-card__tagline {
  display: inline-block; margin-top: var(--space-md);
  font-size: 0.75rem; font-weight: 500; color: var(--accent-gold); letter-spacing: 0.04em;
}

/* Featured card subtle gradient */
.feature-card--featured {
  background-image: linear-gradient(135deg, rgba(212, 168, 83, 0.03) 0%, transparent 50%);
}

/* ── 11. Differentiation Section ("Why BaZi?") ── */
.differentiation { padding-block: var(--space-3xl); background-color: var(--bg-secondary); }
.diff-header { margin-bottom: var(--space-2xl); }
.diff-header .overline { margin-bottom: var(--space-sm); }
.diff-header h2 { margin-bottom: var(--space-md); }

.diff-list { display: flex; flex-direction: column; gap: 32px; }

.diff-item { display: flex; gap: var(--space-lg); align-items: flex-start; }
.diff-item__num {
  display: flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; min-width: 44px;
  background: var(--accent-gold-glow); border-radius: 50%;
  font-family: var(--font-serif); font-size: 0.875rem; font-weight: 700;
  color: var(--accent-gold); flex-shrink: 0;
}
.diff-item__content h3 { margin-bottom: var(--space-xs); }
.diff-item__content p { color: var(--text-secondary); line-height: 1.65; }

.diff-close {
  margin-top: var(--space-2xl); text-align: center;
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 0.9rem+0.5vw, 1.25rem);
  font-style: italic; color: var(--text-secondary);
  max-width: 560px; margin-inline: auto; line-height: 1.6;
}
@media (min-width: 768px) { .diff-list { gap: 40px; } }

/* ── 12. Footer ── */
.footer {
  background-color: var(--bg-footer);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-block: 40px 24px;
}
.footer-grid {
  display: grid; grid-template-columns: 1fr; gap: var(--space-xl);
  max-width: 1200px; margin-inline: auto; padding-inline: var(--space-lg);
}
@media (min-width: 768px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .footer { padding-block: 64px 32px; }
}
@media (min-width: 1024px) { .footer-grid { grid-template-columns: 1.2fr 0.8fr 0.8fr; } }

.footer-brand { display: flex; flex-direction: column; gap: var(--space-sm); }
.footer-brand-name {
  font-family: var(--font-serif); font-size: 1.125rem; font-weight: 600;
  color: var(--text-primary); display: flex; align-items: center; gap: var(--space-xs);
}
.footer-brand-name .mark { color: var(--accent-gold); }
.footer-brand-tagline { font-size: 0.875rem; color: var(--text-tertiary); }

.footer-col-heading {
  font-family: var(--font-sans); font-size: 0.75rem; font-weight: 500;
  color: var(--text-tertiary); text-transform: uppercase;
  letter-spacing: 0.08em; margin-bottom: var(--space-md);
}
.footer-links { display: flex; flex-direction: column; gap: var(--space-sm); }
.footer-links a {
  font-size: 0.875rem; color: var(--text-tertiary);
  transition: color var(--duration-fast) ease;
}
.footer-links a:hover { color: var(--accent-gold); }
.footer-links a:focus-visible { outline: 2px solid var(--border-focus); outline-offset: 2px; }

.footer-social { display: flex; gap: var(--space-md); }
.footer-social a {
  color: var(--text-tertiary); transition: color var(--duration-fast) ease;
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 50%;
}
.footer-social a:hover { color: var(--accent-gold); }
.footer-social a:focus-visible { outline: 2px solid var(--border-focus); outline-offset: 2px; }
.footer-social svg { width: 20px; height: 20px; }

.footer-bottom {
  margin-top: var(--space-xl); padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  text-align: center; font-size: 0.6875rem; color: var(--text-tertiary);
  max-width: 1200px; margin-inline: auto; padding-inline: var(--space-lg);
}

/* ── 13. Scroll Reveal Animation ── */
.reveal {
  opacity: 0; transform: translateY(24px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}
.reveal.revealed { opacity: 1; transform: translateY(0); }

/* Stagger children in feature cards */
.reveal-stagger > * {
  opacity: 0; transform: translateY(16px);
  transition: opacity 0.4s var(--ease-out), transform 0.4s var(--ease-out);
}
.reveal-stagger.revealed > *:nth-child(1) { transition-delay: 0ms;   opacity: 1; transform: translateY(0); }
.reveal-stagger.revealed > *:nth-child(2) { transition-delay: 80ms;  opacity: 1; transform: translateY(0); }
.reveal-stagger.revealed > *:nth-child(3) { transition-delay: 160ms; opacity: 1; transform: translateY(0); }
.reveal-stagger.revealed > *:nth-child(4) { transition-delay: 240ms; opacity: 1; transform: translateY(0); }
.reveal-stagger.revealed > *:nth-child(5) { transition-delay: 320ms; opacity: 1; transform: translateY(0); }

/* Reduced motion reveal override */
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}