/* ============================================================
   LAYOUT — Sidebar shell, content area, responsive grid
   ============================================================ */

/* ── Site wrapper ────────────────────────────────────────── */
.site-wrapper {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ─────────────────────────────────────────────── */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  background-color: var(--color-surface);
  border-right: var(--border-width) solid var(--color-border);
  padding: var(--s-7) var(--s-6) 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  z-index: 100;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

/* ── Sidebar — Brand ────────────────────────────────────── */
.sidebar__brand {
  margin-bottom: var(--s-5);
}

.sidebar__logo {
  font-family: var(--font-mono);
  font-size: var(--text-md);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-1);
  display: block;
  margin-bottom: var(--s-3);
  transition: color var(--t-fast) var(--ease-out);
}

.sidebar__logo:hover {
  color: var(--color-accent);
}

.sidebar__tagline {
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  color: var(--color-text-3);
  line-height: var(--leading-normal);
}

.sidebar__brand-actions {
  display: flex;
  align-items: center;
  gap: var(--s-3);
}

.sidebar__toggle,
.right-panel__toggle {
  display: none;
}

/* ── Sidebar — Divider ──────────────────────────────────── */
.sidebar__divider {
  border: none;
  border-top: var(--border-width) solid var(--color-border);
  margin: var(--s-4) 0;
}

/* ── Sidebar — Nav ──────────────────────────────────────── */
.sidebar__nav {
  flex: 1;
}

.sidebar__nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--s-1);
}

.sidebar__nav-item a {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.01em;
  color: var(--color-text-2);
  display: block;
  padding: var(--s-2) 0;
  transition: color var(--t-fast) var(--ease-out);
  position: relative;
}

.sidebar__nav-item a::before {
  content: '';
  position: absolute;
  left: -var(--s-5);
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width var(--t-fast) var(--ease-out);
}

.sidebar__nav-item a:hover {
  color: var(--color-text-1);
}

.sidebar__nav-item a.active {
  color: var(--color-accent);
  font-weight: 500;
}

/* ── Sidebar — Social Footer ────────────────────────────── */
.sidebar__footer {
  padding-top: var(--s-5);
  padding-bottom: var(--s-6);
  border-top: var(--border-width) solid var(--color-border);
  margin-top: var(--s-5);
}

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

.sidebar__social a {
  color: var(--color-text-3);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  transition: color var(--t-fast) var(--ease-out);
}

.sidebar__social a:hover {
  color: var(--color-accent);
}

.sidebar__social svg {
  width: 15px;
  height: 15px;
  stroke: currentColor;
  stroke-width: 1.6;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

/* ── Main Content ────────────────────────────────────────── */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: var(--s-8) var(--s-8) var(--s-10);
}

.page-inner {
  max-width: var(--content-max);
}

/* ── Responsive breakpoints ──────────────────────────────── */
@media (max-width: 1023px) {
  .sidebar {
    width: 100%;
    height: 54px;
    padding: 0 var(--s-5);
    border-right: none;
    border-bottom: var(--border-width) solid var(--color-border);
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    overflow: hidden;
    transition: height var(--t-mid) var(--ease-out), background-color var(--t-fast) var(--ease-out);
  }

  .sidebar.is-open {
    height: 100vh;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    overflow-y: auto;
  }

  .sidebar__brand {
    margin-bottom: 0;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    height: 54px;
    flex-shrink: 0;
  }

  .sidebar__logo {
    margin-bottom: 0;
    font-size: var(--text-sm);
  }

  .sidebar__tagline {
    display: none;
  }

  .sidebar__toggle,
  .right-panel__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    min-width: 44px;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    color: var(--color-text-1);
    padding: var(--s-2) var(--s-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: background-color var(--t-fast) var(--ease-out), border-color var(--t-fast) var(--ease-out);
  }

  .sidebar__toggle:hover,
  .sidebar__toggle:focus-visible,
  .right-panel__toggle:hover,
  .right-panel__toggle:focus-visible,
  .right-panel__toggle.active {
    border-color: var(--color-accent);
    background-color: var(--color-code-bg);
  }

  .sidebar__nav,
  .sidebar__footer {
    display: none;
  }

  .sidebar.is-open .sidebar__nav {
    display: block;
    margin-top: var(--s-6);
  }

  .sidebar.is-open .sidebar__footer {
    display: block;
    margin-top: auto;
    padding-bottom: var(--s-7);
  }

  .sidebar__nav-list {
    gap: var(--s-2);
  }

  .sidebar__nav-item a {
    padding: var(--s-3) 0;
    border-bottom: var(--border-width) solid var(--color-border);
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .sidebar__nav-item a::before {
    display: none;
  }

  .main-content {
    margin-left: 0;
    padding-top: calc(54px + var(--s-6));
    padding-left: var(--s-5);
    padding-right: var(--s-5);
  }
}

@media (max-width: 600px) {
  .main-content {
    padding-left: var(--s-4);
    padding-right: var(--s-4);
    padding-bottom: var(--s-9);
  }
}

/* ── Update metadata indicators ──────────────────────────── */
.sidebar__update {
  font-size: var(--text-xs);
  color: var(--color-text-3);
  margin-top: var(--s-4);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.mobile-nav-update {
  font-size: var(--text-xs);
  color: var(--color-text-3);
  margin-top: var(--s-4);
  font-family: var(--font-mono);
  text-align: center;
  width: 100%;
}