/* layout.css | containers, grid, page scaffolding */

/* containers */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.container--narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.container--wide {
  width: 100%;
  max-width: 1440px;
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

/* section spacing */
.section        { padding-block: var(--space-24); }
.section--tight { padding-block: var(--space-16); }
.section--flush { padding-block: 0; }

.section-header           { margin-bottom: var(--space-12); }
.section-header--centered { text-align: center; }

.section-header__label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-primary);
  margin-bottom: var(--space-3);
}

.section-header__title {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.section-header__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 56ch;
  line-height: var(--leading-relaxed);
}

.section-header--centered .section-header__subtitle { margin-inline: auto; }

/* grid utilities */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
  gap: var(--space-6);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 480px), 1fr));
  gap: var(--space-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 240px), 1fr));
  gap: var(--space-6);
}

.grid-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
  gap: var(--space-4);
}

.grid-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr));
  gap: var(--space-6);
}

/* flex 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; }
.flex-start   { display: flex; align-items: center; justify-content: flex-start; }
.flex-wrap    { flex-wrap: wrap; }

.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); }

/* page scaffolding */
.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  padding-top: var(--nav-height);
}

.subject-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-8);
  align-items: start;
}

.subject-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-8));
  max-height: calc(100vh - var(--nav-height) - var(--space-16));
  overflow-y: auto;
}

.subject-sidebar::-webkit-scrollbar       { width: 4px; }
.subject-sidebar::-webkit-scrollbar-track { background: transparent; }
.subject-sidebar::-webkit-scrollbar-thumb { background: var(--color-border-light); border-radius: var(--radius-full); }

@media (max-width: 1024px) {
  .subject-layout {
    grid-template-columns: 1fr;
  }
  .subject-sidebar {
    position: static;
    max-height: none;
    overflow-y: visible;
  }
}

/* responsive helpers */
.hide-mobile  { display: none; }
.hide-desktop { display: revert; }

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

@media (max-width: 768px) {
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-2xl); }
  h3 { font-size: var(--text-xl); }

  .section              { padding-block: var(--space-16); }
  .section-header       { margin-bottom: var(--space-8); }
  .section-header__title { font-size: var(--text-2xl); }
}

@media (max-width: 480px) {
  h1      { font-size: var(--text-3xl); }
  .section { padding-block: var(--space-12); }
}

/* spacing utilities */
.mt-4  { margin-top: var(--space-4); }
.mt-6  { margin-top: var(--space-6); }
.mt-8  { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }

.mb-4  { margin-bottom: var(--space-4); }
.mb-6  { margin-bottom: var(--space-6); }
.mb-8  { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

.pt-8  { padding-top: var(--space-8); }
.pb-8  { padding-bottom: var(--space-8); }