/* ==========================================================================
   VITALYS — WHY CHOOSE OUR WATER (FEATURE SECTION)
   Sections: Variables, Section, Feature Grid, Cards, Icon Circle, Divider,
   Typography, Hover Effects, Animations, Responsive Breakpoints.
   Shares brand tokens (--font-nav, --color-accent, --ease-out-quart, etc.)
   already defined in navbar.css; only section-specific tokens live here.
   ========================================================================== */

/* ==========================================================================
   1. CSS VARIABLES
   ========================================================================== */
:root {
  --features-padding-desktop: 90px;
  --features-padding-tablet: 70px;
  --features-padding-mobile: 60px;

  /* Dark navy = brand blue darkened, not a neutral gray, so titles read as
     part of the same blue family as the icon circles and CTA buttons. */
  --color-navy: #0c2c51;
  /* Light-blue divider = brand blue lightened toward white. */
  --color-divider: #dce6f1;
  --color-description: #666666;

  --feature-icon-size: 120px;
  --feature-icon-glyph: 50px;
  --feature-card-radius: 20px;
  --feature-card-padding: 40px;
}

/* ==========================================================================
   2. SECTION
   ========================================================================== */
.features {
  background: #ffffff;
  padding-top: var(--features-padding-desktop);
  padding-bottom: var(--features-padding-desktop);
}

.features-heading {
  margin: 0 0 56px;
  font-family: var(--font-nav);
  font-weight: 700;
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  text-align: center;
  color: var(--color-navy);
}

/* ==========================================================================
   3. FEATURE GRID
   ========================================================================== */
.features-grid > .col {
  display: flex;
}

/* ==========================================================================
   4. CARDS
   ========================================================================== */
.feature-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  background: #ffffff;
  border-radius: var(--feature-card-radius);
  padding: var(--feature-card-padding);
  text-align: center;
  box-shadow: 0 2px 18px rgba(12, 44, 81, 0.06);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.feature-card:hover,
.feature-card:focus-within {
  transform: translateY(-10px);
  box-shadow: 0 24px 48px rgba(12, 44, 81, 0.16);
}

/* ==========================================================================
   5. ICON CIRCLE
   ========================================================================== */
.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: var(--feature-icon-size);
  height: var(--feature-icon-size);
  border-radius: 50%;
  background: var(--color-accent);
  color: #ffffff;
  transition: transform 0.35s ease;
}

.feature-icon svg {
  width: var(--feature-icon-glyph);
  height: var(--feature-icon-glyph);
}

.feature-card:hover .feature-icon,
.feature-card:focus-within .feature-icon {
  transform: scale(1.06);
}

/* ==========================================================================
   6. DIVIDER
   ========================================================================== */
.feature-divider {
  width: 70%;
  height: 1px;
  margin: 30px auto;
  border: none;
  background: var(--color-divider);
}

/* ==========================================================================
   7. TYPOGRAPHY
   ========================================================================== */
.feature-title {
  margin: 0 0 16px;
  font-family: var(--font-nav);
  font-weight: 600;
  font-size: 30px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--color-navy);
  transition: color 0.35s ease;
}

.feature-description {
  margin: 0;
  max-width: 280px;
  font-family: var(--font-nav);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-description);
}

/* ==========================================================================
   8. HOVER EFFECTS
   ========================================================================== */
.feature-card:hover .feature-title,
.feature-card:focus-within .feature-title {
  color: var(--color-accent);
}

/* ==========================================================================
   9. ANIMATIONS
   ========================================================================== */
@keyframes featureFadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Cards are fully visible by default. features.js opts individual cards
   into the hidden pre-animation state (.will-animate) only after
   confirming IntersectionObserver support and no reduced-motion
   preference — so a JS failure or a headless/no-scroll render never
   ships a blank section. */
.feature-card.will-animate {
  opacity: 0;
  transform: translateY(30px);
}

.feature-card.will-animate.is-visible {
  animation: featureFadeUp 0.7s var(--ease-out-quart) both;
}

.features-grid > .col:nth-child(1) .feature-card.is-visible {
  animation-delay: 0ms;
}

.features-grid > .col:nth-child(2) .feature-card.is-visible {
  animation-delay: 150ms;
}

.features-grid > .col:nth-child(3) .feature-card.is-visible {
  animation-delay: 300ms;
}

@media (prefers-reduced-motion: reduce) {
  .feature-card.will-animate,
  .feature-card.will-animate.is-visible {
    animation: none;
    opacity: 1;
    transform: none;
  }

  .feature-card:hover,
  .feature-card:focus-within {
    transform: none;
  }

  .feature-card:hover .feature-icon,
  .feature-card:focus-within .feature-icon {
    transform: none;
  }
}

/* ==========================================================================
   10. RESPONSIVE BREAKPOINTS
   ========================================================================== */

/* Tablet: 768px–991px */
@media (min-width: 768px) and (max-width: 991.98px) {
  .features {
    padding-top: var(--features-padding-tablet);
    padding-bottom: var(--features-padding-tablet);
  }

  .feature-title {
    font-size: 24px;
  }
}

/* Mobile: below 768px */
@media (max-width: 767.98px) {
  .features {
    padding-top: var(--features-padding-mobile);
    padding-bottom: var(--features-padding-mobile);
  }

  .features-heading {
    margin-bottom: 40px;
  }

  .feature-card {
    padding: 32px 28px;
  }

  .feature-icon {
    width: 96px;
    height: 96px;
  }

  .feature-icon svg {
    width: 40px;
    height: 40px;
  }

  .feature-title {
    font-size: 20px;
    letter-spacing: 2px;
  }
}