/* ============================================================
   NAVIGATION — Top bar, sticky + blur, announcement bar
   ============================================================ */

/* ── Announcement Bar — accent line only, no text ── */
.announce-bar {
  background: var(--accent);
  height: var(--announce-h);
  display: block;
  position: relative;
  z-index: var(--z-announce);
  overflow: hidden;
}
.announce-bar * {
  display: none;
}

.announce-bar a {
  color: #ffffff;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.announce-bar .announce-messages {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

.announce-bar .announce-msg {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  opacity: 0;
  transition: opacity var(--duration-md) var(--ease);
}
.announce-bar .announce-msg.active {
  opacity: 1;
}

.announce-bar .announce-close {
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: #ffffff;
  cursor: pointer;
  padding: var(--space-1);
  opacity: 0.7;
  transition: opacity var(--duration) var(--ease);
}
.announce-bar .announce-close:hover { opacity: 1; }

.announce-bar.dismissed { display: none; }

/* ── Main Nav ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 10000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-h);
  transition: transform var(--duration-md) var(--ease),
              box-shadow var(--duration-md) var(--ease);
}

.nav.scrolled {
  box-shadow: var(--shadow);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-w-lg);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ── Logo ── */
.nav-logo {
  display: flex;
  align-items: baseline;
  gap: 0;
  letter-spacing: -0.01em;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 750;
  -webkit-text-stroke: 0.3px currentColor;
  font-size: var(--text-xl);
  letter-spacing: -0.03em;
  word-spacing: -0.12em;
  color: var(--text);
  text-decoration: none;
}
.nav-logo .delta {
  font-family: 'Instrument Serif', serif;
  font-weight: 400;
  font-style: normal;
  font-size: 1.2em;
  line-height: 0;
  color: var(--accent);
}

/* ── Links ── */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-links a {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-body);
  transition: color var(--duration) var(--ease);
  text-decoration: none;
  padding: var(--space-2) 0;
}
.nav-links a:hover { color: var(--text); }

/* ── Dropdown ── */
.nav-dropdown {
  position: relative;
}
.nav-dropdown > a::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 4px solid currentColor;
  margin-left: 6px;
  vertical-align: middle;
  transition: transform var(--duration) var(--ease);
}
.nav-dropdown.open > a::after { transform: rotate(180deg); }

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  padding-top: calc(var(--space-2) + 8px);
  min-width: 200px;
  display: none;
}
/* Invisible bridge so mouse doesn't lose hover crossing the gap */
.nav-dropdown-menu::before {
  content: '';
  position: absolute;
  top: -16px;
  left: 0;
  right: 0;
  height: 16px;
}
/* JS controls visibility via .open class */
.nav-dropdown.open .nav-dropdown-menu {
  display: block;
}

.nav-dropdown-menu a {
  display: block;
  padding: 10px 16px;
  border-radius: 6px;
  font-size: var(--text-sm);
  color: var(--text-body);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.nav-dropdown-menu a:hover {
  background: #f1f5f9;
  color: #0f172a;
}
}

/* ── CTA Buttons ── */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ── Mobile Toggle ── */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  color: var(--text);
}
.nav-toggle svg { width: 24px; height: 24px; }

/* ── Mobile Overlay ── */
.nav-mobile {
  display: none;
  position: fixed;
  inset: 0;
  top: var(--nav-h);
  background: var(--bg);
  z-index: var(--z-overlay);
  padding: var(--space-8) var(--gutter);
  flex-direction: column;
  gap: var(--space-4);
}
.nav-mobile.open { display: flex; }

.nav-mobile a {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--text);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--border);
  display: block;
}

.nav-mobile .nav-mobile-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .nav-links,
  .nav-actions { display: none; }
  .nav-toggle { display: block; }
}