/* ================================
   LAYOUT STRUCTURE
   Spacing, positioning, display - NO VISUAL STYLES
   Rule: Structure and skin must be separate
   ================================ */

/* Container System */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Spacing Utilities */
.section {
  padding: 80px 20px;
}

.section-lg {
  padding: 120px 20px;
}

.section-xl {
  padding: 200px 20px;
}

/* Flexbox Utilities */
.flex {
  display: flex;
}

.flex-col {
  display: flex;
  flex-direction: column;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.gap-sm {
  gap: 12px;
}

.gap-md {
  gap: 20px;
}

.gap-lg {
  gap: 40px;
}

.gap-xl {
  gap: 80px;
}

/* Grid System */
.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
}

/* Positioning */
.relative {
  position: relative;
}

.absolute {
  position: absolute;
}

.fixed {
  position: fixed;
}

.sticky {
  position: sticky;
  top: 0;
}

/* Alignment */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

/* Display */
.block {
  display: block;
}

.inline-block {
  display: inline-block;
}

.hidden {
  display: none;
}

/* Overflow */
.overflow-hidden {
  overflow: hidden;
}

/* Mobile Layout Adjustments */
@media (max-width: 768px) {
  .container,
  .container-narrow,
  .container-wide {
    padding: 0 16px;
  }

  .section {
    padding: 60px 20px;
  }

  .section-lg {
    padding: 80px 20px;
  }

  .section-xl {
    padding: 100px 20px;
  }

  .grid-2 {
    grid-template-columns: 1fr;
    gap: 60px;
  }

  .gap-lg {
    gap: 20px;
  }

  .gap-xl {
    gap: 40px;
  }
}