/* ==========================================================================
   TrulyCertify — Header / Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t), box-shadow var(--t), background var(--t);
}
.site-header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  border-bottom-color: var(--border);
  box-shadow: 0 1px 0 rgba(6, 37, 40, 0.04), 0 4px 20px rgba(6, 37, 40, 0.05);
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 1rem 1.5rem;
  max-width: var(--container-wide);
  margin: 0 auto;
}

/* ===== Logo ===== */
.brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
  color: var(--primary-dark);
  flex-shrink: 0;
}
.brand:hover { color: var(--primary-dark); }
.brand-mark {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  border-radius: 9px;
  display: grid;
  place-items: center;
  position: relative;
}
.brand-mark::after {
  content: '';
  position: absolute;
  inset: 4px;
  border: 1.5px solid rgba(255,255,255,0.9);
  border-radius: 5px;
}
.brand-mark svg { width: 18px; height: 18px; color: #fff; position: relative; z-index: 1; }
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}
.brand-name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--primary-dark);
}
.brand-tagline {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent);
  margin-top: 4px;
  font-weight: 600;
}

/* ===== Nav ===== */
.nav-primary {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav-primary a {
  color: var(--text);
  padding: 0.5rem 0.95rem;
  border-radius: 6px;
  font-size: 0.94rem;
  font-weight: 500;
  position: relative;
  transition: color var(--t-fast), background var(--t-fast);
}
.nav-primary a:hover {
  color: var(--primary);
  background: rgba(13, 74, 78, 0.05);
}
.nav-primary a.active {
  color: var(--primary);
}
.nav-primary a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

/* ===== Header CTA ===== */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.btn-header-cta {
  background: var(--accent);
  color: var(--white);
  padding: 0.7rem 1.4rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.93rem;
  border: none;
  transition: background var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
  letter-spacing: 0.005em;
  white-space: nowrap;
}
.btn-header-cta:hover {
  background: var(--accent-dark);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(30, 168, 137, 0.3);
}

/* ===== Hamburger ===== */
.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0;
  position: relative;
  border-radius: 6px;
}
.menu-toggle:hover { background: rgba(13, 74, 78, 0.05); }
.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--primary-dark);
  border-radius: 2px;
  margin: 0 auto;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  transition: all var(--t-fast);
}
.menu-toggle span:nth-child(1) { top: 14px; }
.menu-toggle span:nth-child(2) { top: 20px; }
.menu-toggle span:nth-child(3) { top: 26px; }
.menu-toggle[aria-expanded="true"] span:nth-child(1) { top: 20px; transform: translateX(-50%) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { top: 20px; transform: translateX(-50%) rotate(-45deg); }

/* ===== Mobile nav ===== */
@media (max-width: 960px) {
  .header-bar { padding: 0.85rem 1.25rem; gap: 0.75rem; }
  .nav-primary {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    align-items: stretch;
    padding: 1.5rem 1.5rem 2rem;
    gap: 0.25rem;
    transform: translateY(-150%);
    visibility: hidden;
    opacity: 0;
    transition: transform var(--t), visibility var(--t), opacity var(--t);
    box-shadow: 0 12px 32px rgba(6, 37, 40, 0.08);
    border-top: 1px solid var(--border);
    max-height: calc(100vh - 70px);
    overflow-y: auto;
  }
  .nav-primary.open {
    transform: translateY(0);
    visibility: visible;
    opacity: 1;
  }
  .nav-primary a {
    padding: 0.85rem 1rem;
    font-size: 1.05rem;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
  }
  .nav-primary a:last-child { border-bottom: none; }
  .nav-primary a.active::after { display: none; }
  .nav-primary a.active {
    background: rgba(30, 168, 137, 0.08);
    border-radius: 6px;
    border-color: transparent;
  }
  .menu-toggle { display: block; }
  .brand-tagline { display: none; }
  .btn-header-cta { padding: 0.6rem 1.1rem; font-size: 0.88rem; }
}

@media (max-width: 480px) {
  .brand-name { font-size: 1.15rem; }
  .brand-mark { width: 34px; height: 34px; }
  .btn-header-cta { padding: 0.55rem 0.9rem; font-size: 0.82rem; }
}