/* ===================================================
   ECOLEAD — Navigation Styles
   =================================================== */

/* ── Site Header ───────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  transition: background var(--t-base), box-shadow var(--t-base), padding var(--t-base), backdrop-filter var(--t-base);
  padding: 0;
}

/* Transparent state (on hero background) */
.site-header.transparent {
  background: linear-gradient(to bottom, rgba(15, 38, 28, 0.75) 0%, rgba(15, 38, 28, 0) 100%);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

/* Solid state (scrolled down past hero or page banner) */
.site-header.solid,
.site-header.scrolled {
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

/* ── Nav Inner ─────────────────────────────────── */
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  padding: 0 var(--space-lg);
  max-width: var(--container-wide);
  margin: 0 auto;
  gap: var(--space-lg);
}

/* ── Logo ──────────────────────────────────────── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo img {
  height: 46px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.15));
  transition: filter var(--t-fast);
}

.nav-logo-text {
  display: flex;
  flex-direction: column;
}

.nav-logo-name {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--clr-primary);
  line-height: 1.1;
  letter-spacing: 0.02em;
  transition: color var(--t-fast);
}

.nav-logo-tagline {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--clr-primary-muted);
  text-transform: uppercase;
  line-height: 1.1;
  transition: color var(--t-fast);
}

.site-header.transparent .nav-logo-name {
  color: var(--clr-white);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.site-header.transparent .nav-logo-tagline {
  color: rgba(255, 255, 255, 0.85);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

/* ── Nav Links ─────────────────────────────────── */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex: 1;
  justify-content: center;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.55rem 0.95rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--clr-primary);
  border-radius: var(--radius-sm);
  transition: all var(--t-fast);
  white-space: nowrap;
  text-decoration: none;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0.95rem;
  right: 0.95rem;
  height: 2.5px;
  background: var(--clr-accent);
  border-radius: 2px;
  transform: scaleX(0);
  transition: transform var(--t-base);
  transform-origin: center;
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

.nav-link:hover { color: var(--clr-primary-muted); }
.nav-link.active { color: var(--clr-primary); }

/* Transparent nav link styles */
.site-header.transparent .nav-link {
  color: rgba(255, 255, 255, 0.92);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
}

.site-header.transparent .nav-link:hover {
  color: var(--clr-white);
  background: rgba(255, 255, 255, 0.12);
}

.site-header.transparent .nav-link.active {
  color: var(--clr-white);
  font-weight: 700;
}

.site-header.transparent .nav-link::after {
  background: var(--clr-accent-light);
}

/* ── Nav CTA Button ────────────────────────────── */
.nav-cta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-shrink: 0;
}

.btn-donate {
  background: var(--clr-accent);
  color: var(--clr-white);
  border: 2px solid var(--clr-accent);
  padding: 0.55rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  transition: all var(--t-base);
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(217, 119, 6, 0.3);
}

.btn-donate:hover {
  background: #b45309;
  border-color: #b45309;
  box-shadow: 0 4px 14px rgba(180, 83, 9, 0.4);
  transform: translateY(-1px);
}

/* ── Mobile Toggle ─────────────────────────────── */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  transition: background var(--t-fast);
  flex-shrink: 0;
}

.nav-toggle:hover { background: var(--clr-primary-pale); }

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--clr-primary);
  border-radius: 2px;
  transition: all var(--t-base);
  transform-origin: center;
}

.site-header.transparent .nav-toggle span { background: var(--clr-white); }

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Mobile Menu Drawer ────────────────────────── */
.nav-drawer {
  display: none; /* Completely hidden on desktop */
}

/* ── Responsive ────────────────────────────────── */
@media (max-width: 1024px) {
  .nav-logo-text { display: none; }
}

@media (max-width: 900px) {
  .nav-menu { display: none; }
  .nav-toggle { display: flex; }
  .nav-cta { display: none; }
  .nav-inner { height: 64px; }

  .nav-drawer {
    display: block;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--clr-white);
    box-shadow: var(--shadow-lg);
    z-index: calc(var(--z-nav) - 1);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--t-slow), opacity var(--t-base), visibility var(--t-base);
    border-top: 1px solid var(--clr-border);
    padding: var(--space-lg) var(--space-lg) var(--space-xl);
    max-height: calc(100vh - 64px);
    overflow-y: auto;
  }

  .nav-drawer.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-drawer .nav-link {
    display: flex;
    padding: 0.9rem 0.5rem;
    border-bottom: 1px solid var(--clr-border);
    font-size: 0.97rem;
    color: var(--clr-primary);
    border-radius: 0;
  }

  .nav-drawer .nav-link::after { display: none; }
  .nav-drawer .nav-link.active { color: var(--clr-accent); font-weight: 700; }
  .nav-drawer .nav-link:last-of-type { border-bottom: none; }

  .nav-drawer .drawer-cta {
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--clr-border);
  }
}