/* ================================
   Hamburger Menu × Slide Sidebar
   ================================ */

/* — Reset header for mobile —
   Desktop nav is hidden, hamburger shown */

header .container nav {
  display: flex;
}

/* Hamburger Button — inline inside header-left */
.hamburger {
  display: none; /* shown on mobile via media query */
  width: 28px;
  height: 24px;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: space-between;
  padding: 0;
  flex-shrink: 0;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s ease;
  transform-origin: center;
}

/* Hamburger → X animation */
.hamburger.active span:nth-child(1) {
  transform: translateY(10px) rotate(45deg);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.hamburger.active span:nth-child(3) {
  transform: translateY(-10px) rotate(-45deg);
}

/* — Sidebar — */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 280px;
  height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  z-index: 999;
  transform: translateX(-100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  overflow-y: auto;
  padding: 20px;
}

.sidebar.open {
  transform: translateX(0);
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.sidebar-logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
}

.sidebar-close {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 4px;
  transition: color 0.2s;
}

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

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius);
  color: var(--text);
  text-decoration: none;
  font-size: 1.05rem;
  font-weight: 500;
  transition: background 0.2s, color 0.2s;
}

.sidebar-link:hover {
  background: var(--card);
  color: var(--accent);
}

/* — Overlay — */
.menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

.menu-overlay.show {
  opacity: 1;
  pointer-events: auto;
}

/* — Mobile: show hamburger on < 768px — */
@media (max-width: 768px) {
  header .container nav {
    display: none !important;
  }

  .hamburger {
    display: flex;
  }
}