/* ============================================================
   LAYOUT.CSS — Sidebar, Grid, Containers
   ============================================================ */

/* ── App Shell ──────────────────────────────────────────── */
.app-shell {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ────────────────────────────────────────────── */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  border-right: 1px solid var(--color-surface);
  background-color: var(--color-bg);
  display: flex;
  flex-direction: column;
  z-index: 100;
  overflow-y: auto;
}

.sidebar__brand {
  padding: 24px 16px 16px;
  border-bottom: 1px solid var(--color-surface);
}

.sidebar__name {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  line-height: 1;
  display: block;
}

.sidebar__meta {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 6px;
  display: block;
}

.sidebar__nav {
  flex: 1;
  padding: 8px 0;
}

.sidebar__nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text);
  border-left: 2px solid transparent;
  transition: background-color 150ms ease, color 150ms ease;
  cursor: pointer;
}

.sidebar__nav-item:hover {
  background-color: var(--color-surface);
}

.sidebar__nav-item.is-active {
  background-color: var(--color-accent);
  color: var(--color-white);
  border-left-color: transparent;
}

.sidebar__nav-item.is-active svg,
.sidebar__nav-item.is-active .nav-icon {
  color: var(--color-white);
}

.sidebar__nav-item svg,
.nav-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  color: var(--color-text-muted);
}

.sidebar__nav-item.is-active .nav-icon {
  color: var(--color-white);
}

.sidebar__footer {
  padding: 16px;
  border-top: 1px solid var(--color-surface);
}

.sidebar__footer-link {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: 8px 0;
  transition: color 150ms ease;
}

.sidebar__footer-link:hover {
  color: var(--color-text);
}

/* ── Main Content ───────────────────────────────────────── */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-inner {
  max-width: 1100px;
  width: 100%;
  padding: 0 48px;
  margin: 0 auto;
}

/* ── Section spacing ────────────────────────────────────── */
.section {
  padding: 64px 0;
  border-bottom: 1px solid var(--color-surface);
}

.section:last-child {
  border-bottom: none;
}

.section--tight {
  padding: 40px 0;
}

.section--hero {
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--color-surface);
}

/* ── Grid ───────────────────────────────────────────────── */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background-color: var(--color-surface);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background-color: var(--color-surface);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background-color: var(--color-surface);
}

.grid-gap {
  gap: 24px;
  background-color: transparent;
}

/* ── Page Header ────────────────────────────────────────── */
.page-header {
  padding: 56px 48px 40px;
  border-bottom: 1px solid var(--color-surface);
}

.page-header__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
  display: block;
}

.page-header__title {
  font-family: var(--font-display);
  font-size: var(--text-h1);
  line-height: 0.95;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.page-header__meta-bar {
  display: flex;
  gap: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-surface);
}

.meta-item__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  display: block;
  margin-bottom: 4px;
}

.meta-item__value {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: block;
}

/* ── Footer ─────────────────────────────────────────────── */
.site-footer {
  margin-top: auto;
  padding: 24px 48px;
  border-top: 1px solid var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-footer__copy {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.site-footer__status {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 900px) {
  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
    flex-direction: row;
    align-items: center;
    border-right: none;
    border-bottom: 1px solid var(--color-surface);
  }

  .sidebar__brand {
    border-bottom: none;
    border-right: 1px solid var(--color-surface);
    padding: 12px 16px;
  }

  .sidebar__nav {
    display: flex;
    flex-direction: row;
    padding: 0;
  }

  .sidebar__nav-item {
    padding: 12px 14px;
    border-left: none;
    border-bottom: 2px solid transparent;
  }

  .sidebar__nav-item.is-active {
    border-bottom-color: var(--color-accent);
    background-color: transparent;
    color: var(--color-accent);
  }

  .sidebar__footer {
    display: none;
  }

  .main-content {
    margin-left: 0;
  }

  .page-inner {
    padding: 0 24px;
  }

  .page-header {
    padding: 32px 24px 24px;
  }

  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .site-footer { padding: 16px 24px; flex-direction: column; gap: 8px; align-items: flex-start; }
}

@media (max-width: 580px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .page-header__meta-bar { flex-direction: column; gap: 16px; }
  .sidebar__nav-item span { display: none; }
  .sidebar__meta { display: none; }
}