/* ============================================================
   Layout System — Container, Grids, Spacing, Utilities
   ============================================================ */

/* ==================== Container ==================== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  width: 100%;
}

/* ==================== Section Spacing ==================== */
section {
  padding: var(--section-padding);
  position: relative;
}

/* ==================== Section Headers ==================== */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-title {
  font-size: var(--fs-h2);
  margin-bottom: var(--spacing-sm);
  position: relative;
  display: inline-block;
  color: var(--text-primary);
  letter-spacing: var(--ls-heading);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
  box-shadow: 0 0 12px rgba(124, 92, 252, 0.4);
  animation: underlineGlow 3s ease-in-out infinite;
}

@keyframes underlineGlow {
  0%, 100% {
    width: 60px;
    opacity: 0.8;
    box-shadow: 0 0 12px rgba(124, 92, 252, 0.4);
  }
  50% {
    width: 80px;
    opacity: 1;
    box-shadow: 0 0 20px rgba(124, 92, 252, 0.6);
  }
}

.section-subtitle {
  font-size: var(--fs-body-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: var(--spacing-md) auto 0;
  line-height: 1.7;
}

/* ==================== Grid Systems ==================== */

/* 2-column grid */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

/* 3-column grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

/* 4-column grid */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

/* ==================== Responsive Adjustments ==================== */
@media (max-width: 767px) {
  :root {
    --container-padding: 1.25rem;
    --section-padding: 4rem 0;
  }

  .section-header {
    margin-bottom: var(--spacing-2xl);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ==================== Utility Classes ==================== */

/* Text alignment */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Margin utilities */
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* Display utilities */
.hidden { display: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Gradient text utility */
.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}