/* ─── Global Shell: CSS Grid ─────────────────────────────── */
.site {
  display: grid;
  grid-template-columns: var(--sidebar) 1fr;
  grid-template-rows: var(--header) 1fr var(--footer);
  grid-template-areas:
    "header  header"
    "sidebar content"
    "footer  footer";
  height: 100vh;
  overflow: hidden;
}

/* ─── Header ─────────────────────────────────────────────── */
.header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  border-bottom: 1px solid var(--border);
}

.header__name {
  font-size: var(--t-lg);
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.06em;
  transition: opacity var(--ease);
}

.header__name:hover {
  opacity: 0.6;
}

.header__hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 24px;
  height: 18px;
  position: relative;
}

.header__hamburger span {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--text);
  position: absolute;
  left: 0;
  transition: transform var(--ease), opacity var(--ease);
}

.header__hamburger span:nth-child(1) { top: 0; }
.header__hamburger span:nth-child(2) { top: 50%; }
.header__hamburger span:nth-child(3) { bottom: 0; }

/* ─── Sidebar ────────────────────────────────────────────── */
.sidebar {
  grid-area: sidebar;
  padding: 36px 0 24px 28px;
  border-right: 1px solid var(--border);
  overflow-y: auto;
}

.sidebar ul {
  list-style: none;
}

.sidebar li {
  margin-bottom: 10px;
  position: relative;
}

.sidebar a {
  font-size: var(--t-md);
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.03em;
  padding-left: 14px;
  transition: color var(--ease);
  display: block;
}

.sidebar a:hover {
  color: var(--text);
}

.sidebar a.active {
  color: var(--text);
}

.sidebar a.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 1px;
  background: var(--text);
}

/* ─── Content ────────────────────────────────────────────── */
.content {
  grid-area: content;
  overflow-y: auto;
}

/* ─── Footer ─────────────────────────────────────────────── */
.footer {
  grid-area: footer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  font-size: var(--t-sm);
  color: var(--muted);
  border-top: 1px solid var(--border);
}

.footer__left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer__right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.footer a {
  color: var(--muted);
  text-decoration: none;
  transition: color var(--ease);
}

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

.footer svg {
  vertical-align: middle;
}

/* ─── Mobile ─────────────────────────────────────────────── */
@media (max-width: 680px) {
  .site {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "content"
      "footer";
  }

  .header__hamburger {
    display: block;
  }

  .sidebar {
    display: none;
    position: fixed;
    top: var(--header);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg);
    z-index: 90;
    border-right: none;
    padding: 24px 28px;
  }

  .sidebar.open {
    display: block;
  }

  .footer {
    flex-direction: column;
    gap: 4px;
    padding: 8px 28px;
    height: auto;
  }
}