/* ==========================================================================
   M-Convert — Layout primitives
   Containers, header, footer, grid, and page shells.
   ========================================================================== */

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

.container--narrow {
  max-width: 820px;
}

.container--wide {
  max-width: 1440px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-h);
  backdrop-filter: saturate(180%) blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: 100%;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
  font-weight: var(--fw-bold);
  font-size: var(--fs-lg);
  letter-spacing: var(--tracking-tight);
  text-decoration: none;
  flex-shrink: 0;
  min-height: 44px;
  padding-inline: var(--space-1);
}

.site-header__brand:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.site-header__brand svg {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.site-header__brand-text {
  display: inline-flex;
  flex-direction: column;
  line-height: 1.05;
}

.site-header__brand-text small {
  font-size: 0.625rem;
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.site-header__nav {
  display: none;
}

.site-header__actions {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

@media (min-width: 1024px) {
  .site-header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    flex: 1;
    justify-content: center;
  }
}

/* ---------- Main ---------- */
.site-main {
  display: block;
  min-height: 50vh;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: var(--space-20);
  background: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-12) var(--space-8);
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 640px) {
  .site-footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .site-footer__grid {
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-10);
  }
}

.site-footer__brand {
  max-width: 320px;
}

.site-footer__brand p {
  margin-top: var(--space-3);
  line-height: var(--lh-relaxed);
}

.site-footer h3 {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer li {
  margin-bottom: var(--space-2);
}

.site-footer a {
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
}

.site-footer a:hover {
  color: var(--color-primary);
}

.site-footer__bottom {
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: flex-start;
  justify-content: space-between;
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

@media (min-width: 768px) {
  .site-footer__bottom {
    flex-direction: row;
    align-items: center;
  }
}

/* ---------- Grids ---------- */
.grid {
  display: grid;
  gap: var(--space-4);
}

.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }
.grid--4 { grid-template-columns: 1fr; }

@media (min-width: 640px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* ---------- Sections ---------- */
.section {
  padding-block: var(--space-12);
}

@media (min-width: 768px) {
  .section {
    padding-block: var(--space-16);
  }
}

.section--tight {
  padding-block: var(--space-8);
}

.section--soft {
  background: var(--color-bg-subtle);
}

.section__head {
  margin-bottom: var(--space-8);
  max-width: 720px;
}

.section__head--center {
  margin-inline: auto;
  text-align: center;
}

.section__head p {
  margin-top: var(--space-3);
  color: var(--color-text-secondary);
  font-size: var(--fs-lg);
  line-height: var(--lh-relaxed);
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  padding-block: var(--space-4);
  font-size: var(--fs-sm);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
  margin: 0;
}

.breadcrumbs li {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-secondary);
}

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  color: var(--color-text-muted);
}

.breadcrumbs a {
  color: var(--color-text-secondary);
}

.breadcrumbs a:hover {
  color: var(--color-primary);
}

.breadcrumbs [aria-current="page"] {
  color: var(--color-text);
  font-weight: var(--fw-medium);
}

/* ---------- Page header ---------- */
.page-header {
  padding-block: var(--space-8) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-8);
}

.page-header h1 {
  margin-bottom: var(--space-3);
}

.page-header__lead {
  font-size: var(--fs-lg);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
  max-width: 780px;
}

/* ---------- Layout helpers ---------- */
.stack > * + * { margin-top: var(--space-4); }
.stack-lg > * + * { margin-top: var(--space-8); }

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}