/* ═══════════════════════════════════════════════════════════════════════════
   DNS Panopticon — Layout
   Site navigation shell: top bar, brand, hamburger menu dropdown.
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Site nav ────────────────────────────────────────────────────────────── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--nav-height);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 color-mix(in srgb, var(--border) 50%, transparent);
}

.nav-inner {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 14px;
}

/* ── Brand (left) ────────────────────────────────────────────────────────── */
.nav-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  border-radius: 8px;
  padding: 4px 6px;
  flex-shrink: 0;
  transition: background var(--t-fast);
}

.nav-brand:hover {
  background: var(--surface2);
}

.nav-brand-icon {
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: #fff;
}

.nav-brand-text {
  line-height: 1.2;
}

.nav-brand-name {
  display: block;
  font-size: 13px;
  font-weight: 800;
  color: var(--brand-accent);
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.nav-brand-tagline {
  display: block;
  font-size: 10px;
  color: var(--txt-3);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  white-space: nowrap;
}

@media (max-width: 480px) {
  .nav-brand-tagline { display: none; }
}

/* ── Right-side actions ──────────────────────────────────────────────────── */
.nav-actions {
  display: flex;
  align-items: center;
  margin-left: auto;
}

/* ── Menu wrapper (relative anchor for the dropdown) ─────────────────────── */
.nav-menu-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

/* ── Hamburger / menu trigger button ─────────────────────────────────────── */
.nav-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--txt-2);
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast);
}

.nav-menu-btn:hover {
  background: var(--surface2);
  color: var(--txt);
  border-color: var(--border-hi);
}

.nav-menu-btn[aria-expanded="true"] {
  background: var(--surface2);
  border-color: var(--border-hi);
  color: var(--txt);
}

/* ── Dropdown menu panel ─────────────────────────────────────────────────── */
.nav-menu {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 210px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow:
    0 4px 6px -1px color-mix(in srgb, var(--txt) 8%, transparent),
    0 10px 24px -4px color-mix(in srgb, var(--txt) 12%, transparent);
  padding: 5px;
  z-index: 300;
  /* Subtle entrance animation */
  transform-origin: top right;
}

.nav-menu.open {
  display: block;
  animation: nav-menu-in 0.12s ease both;
}

@keyframes nav-menu-in {
  from { opacity: 0; transform: scale(0.96) translateY(-4px); }
  to   { opacity: 1; transform: scale(1)    translateY(0);    }
}

/* ── Menu items ──────────────────────────────────────────────────────────── */
.nav-menu-item {
  display: flex;
  align-items: center;
  gap: 9px;
  width: 100%;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 7px;
  background: transparent;
  color: var(--txt-2);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast);
  text-decoration: none;
}

.nav-menu-item:hover {
  background: var(--surface2);
  border-color: var(--border);
  color: var(--txt);
}

.nav-menu-item-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 5px;
  background: var(--surface2);
  color: var(--txt-3);
  flex-shrink: 0;
  font-size: 12px;
  font-weight: 700;
}

.nav-menu-item:hover .nav-menu-item-icon {
  background: var(--surface2-hi);
  color: var(--txt-2);
}

.nav-menu-item-label {
  flex: 1;
  white-space: nowrap;
}

/* Right-aligned value badge (e.g. "Light" / "Dark") */
.nav-menu-item-value {
  font-size: 11px;
  color: var(--txt-4);
  font-weight: 400;
  white-space: nowrap;
}

/* ── Sun / moon icon switching ───────────────────────────────────────────── */
.nav-menu-item .icon-sun  { display: none; }
.nav-menu-item .icon-moon { display: block; }

[data-theme="dark"] .nav-menu-item .icon-sun  { display: block; }
[data-theme="dark"] .nav-menu-item .icon-moon { display: none; }

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) .nav-menu-item .icon-sun  { display: block; }
  html:not([data-theme="light"]) .nav-menu-item .icon-moon { display: none; }
}

/* ── Separator ───────────────────────────────────────────────────────────── */
.nav-menu-sep {
  height: 1px;
  background: var(--border);
  margin: 4px 5px;
}

/* ── Page content area ───────────────────────────────────────────────────── */
.page-content {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 14px;
}