/* ==========================================================================
   Layout — Containers, Grids, Responsive Utilities
   Mobile-first approach.
   ========================================================================== */

/* ---- Container ---- */
.container {
  width: 100%;
  max-width: 80rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

.container--narrow {
  max-width: 64rem;
}

.container--reading {
  max-width: 45rem;
}

.container--content {
  max-width: 48rem;
}

.container--profile {
  max-width: 52rem;
}

/* ---- Section Spacing ---- */
.section {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

@media (min-width: 1024px) {
  .section {
    padding-top: var(--space-20);
    padding-bottom: var(--space-20);
  }
}

.section--hero {
  padding-top: var(--space-24);
  padding-bottom: var(--space-20);
  background: linear-gradient(135deg, var(--color-surface-container-low), rgba(0, 128, 128, 0.08));
}

@media (min-width: 1024px) {
  .section--hero {
    padding-top: 9rem;
    padding-bottom: 8rem;
  }
}

/* ---- Grids ---- */
.grid {
  display: grid;
  gap: var(--space-8);
}

.grid-2 {
  display: grid;
  gap: var(--space-8);
}

.grid-3 {
  display: grid;
  gap: var(--space-8);
}

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

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

/* ---- Asymmetric Layout ---- */
.layout-60-40 {
  display: grid;
  gap: var(--space-12);
}

@media (min-width: 1024px) {
  .layout-60-40 {
    grid-template-columns: 3fr 2fr;
    align-items: start;
  }
}

.layout-50-50 {
  display: grid;
  gap: var(--space-12);
}

@media (min-width: 1024px) {
  .layout-50-50 {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

/* ---- Flex Utilities ---- */
.flex {
  display: flex;
}

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

.flex-wrap {
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

.items-end {
  align-items: flex-end;
}

.justify-between {
  justify-content: space-between;
}

.justify-center {
  justify-content: center;
}

.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

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

@media (min-width: 1024px) {
  .lg\:text-right { text-align: right; }
}

/* ---- Spacing Utilities ---- */
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-10 { margin-bottom: var(--space-10); }
.mb-12 { margin-bottom: var(--space-12); }

.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

/* ---- Width Utilities ---- */
.w-full { width: 100%; }
.max-w-3xl { max-width: 48rem; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* ---- Visibility ---- */
.hidden { display: none; }

@media (min-width: 768px) {
  .md\:flex { display: flex; }
  .md\:block { display: block; }
  .md\:hidden { display: none; }
}

.mobile-only {
  display: block;
}

@media (min-width: 768px) {
  .mobile-only {
    display: none;
  }
}

.desktop-only {
  display: none;
}

@media (min-width: 768px) {
  .desktop-only {
    display: block;
  }
}

/* ---- Overflow ---- */
.overflow-x-auto {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* ---- Background Sections ---- */
.bg-surface { background-color: var(--color-surface); }
.bg-surface-low { background-color: var(--color-surface-container-low); }
.bg-surface-high { background-color: var(--color-surface-container-high); }
.bg-white { background-color: var(--color-surface-container-lowest); }