/*
 * Layout: header, footer, container, grid.
 * Mirrors the structure of:
 *   - src/components/layout/Header.tsx (sticky translucent navbar, h-16)
 *   - src/components/layout/HomeLayout.tsx (flex column with dark accent footer)
 */

.t4u-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.t4u-main {
  flex: 1 0 auto;
  width: 100%;
}

.t4u-container {
  max-width: var(--t4u-container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
  width: 100%;
}

@media (min-width: 640px) {
  .t4u-container {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .t4u-container {
    padding-left: var(--t4u-container-pad);
    padding-right: var(--t4u-container-pad);
  }
}

/* ------- Header ------- */

.t4u-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--t4u-shadow-sm);
  transition: box-shadow 0.2s ease;
}

.t4u-header.is-scrolled {
  box-shadow: var(--t4u-shadow);
}

.t4u-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--t4u-header-h);
  gap: 1rem;
}

.t4u-branding {
  flex-shrink: 0;
}

.t4u-branding__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--t4u-accent);
}

.t4u-branding__link:hover,
.t4u-branding__link:focus {
  color: var(--t4u-primary);
}

.t4u-branding__logo {
  height: 2rem;
  width: auto;
}

/* ------- Primary nav ------- */

.t4u-nav {
  display: none;
  margin-left: auto;
}

@media (min-width: 768px) {
  .t4u-nav {
    display: block;
  }
}

.t4u-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.t4u-nav__list a {
  color: var(--t4u-muted-fg);
  font-weight: 500;
  transition: color 0.2s ease;
}

.t4u-nav__list a:hover,
.t4u-nav__list .current-menu-item > a,
.t4u-nav__list .current_page_item > a {
  color: var(--t4u-primary);
}

/* Sub-menu */
.t4u-nav__list .sub-menu {
  list-style: none;
  margin: 0;
  padding: 0.5rem;
  position: absolute;
  top: 100%;
  background: var(--t4u-background);
  border: 1px solid var(--t4u-border);
  border-radius: var(--t4u-radius-md);
  box-shadow: var(--t4u-shadow-lg);
  min-width: 12rem;
  display: none;
}

.t4u-nav__list li {
  position: relative;
}

.t4u-nav__list li:hover > .sub-menu,
.t4u-nav__list li:focus-within > .sub-menu {
  display: block;
}

.t4u-nav__list .sub-menu a {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: var(--t4u-radius-sm);
}

.t4u-nav__list .sub-menu a:hover {
  background: var(--t4u-muted);
}

/* Mobile menu toggle */
.t4u-nav__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: transparent;
  border: 1px solid var(--t4u-border);
  border-radius: var(--t4u-radius-md);
  color: var(--t4u-accent);
  cursor: pointer;
  margin-left: auto;
}

@media (min-width: 768px) {
  .t4u-nav__toggle {
    display: none;
  }
}

.t4u-nav__toggle svg {
  width: 1.25rem;
  height: 1.25rem;
}

.t4u-mobile-nav {
  display: none;
  border-top: 1px solid var(--t4u-border);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
}

.t4u-mobile-nav.is-open {
  display: block;
}

.t4u-mobile-nav__list {
  list-style: none;
  margin: 0;
  padding: 0.75rem 1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.t4u-mobile-nav__list a {
  display: block;
  padding: 0.625rem 0.75rem;
  border-radius: var(--t4u-radius-sm);
  color: var(--t4u-accent);
  font-weight: 500;
}

.t4u-mobile-nav__list a:hover {
  background: var(--t4u-muted);
  color: var(--t4u-primary);
}

.t4u-mobile-nav__list .sub-menu {
  list-style: none;
  margin: 0.25rem 0 0;
  padding-left: 1rem;
  border-left: 2px solid var(--t4u-border);
}

/* ------- Footer ------- */

.t4u-footer {
  background-color: var(--t4u-accent);
  color: var(--t4u-accent-fg);
  padding: 2rem 0;
  margin-top: 4rem;
  flex-shrink: 0;
}

.t4u-footer__inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
}

.t4u-footer a {
  color: var(--t4u-secondary);
}

.t4u-footer a:hover {
  color: var(--t4u-accent-fg);
  text-decoration: underline;
}

.t4u-footer__links {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

/* ------- Page-level layout ------- */

.t4u-page-content {
  padding-top: 3rem;
  padding-bottom: 4rem;
}

@media (min-width: 768px) {
  .t4u-page-content {
    padding-top: 4rem;
  }
}

.t4u-page-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.t4u-page-header__title {
  margin-bottom: 0.5rem;
}

.t4u-page-header__subtitle {
  color: var(--t4u-muted-fg);
  font-size: 1.125rem;
}

/* ------- Post grid ------- */

.t4u-posts {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .t4u-posts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .t4u-posts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2rem;
  }
}

/* ------- Two-column (content + sidebar) ------- */

.t4u-layout-with-sidebar {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
}

@media (min-width: 1024px) {
  .t4u-layout-with-sidebar {
    grid-template-columns: minmax(0, 1fr) 18rem;
  }
}

.t4u-sidebar .widget {
  background: var(--t4u-card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--t4u-card-border);
  border-radius: var(--t4u-radius);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--t4u-shadow);
}

.t4u-sidebar .widget-title {
  font-size: 1.125rem;
  margin: 0 0 0.75rem;
}