/* ── Header ── */
header {
  background: transparent;
  border-bottom: 1px solid transparent;
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  transition: background 0.3s ease, border-color 0.3s ease;
}

header.scrolled {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom-color: var(--color-border);
}

/* ── Desktop nav ── */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 5%;
  height: var(--nav-height);
  max-width: var(--max-width);
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-img {
  width: 110px;
  height: auto;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-links a {
  text-decoration: none;
  color: rgba(10, 10, 10, 0.7);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: -0.01em;
  position: relative;
  padding: 0.35rem 0;
  transition: color 0.2s;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
  transition: width 0.25s ease;
}

/* Hover: colour only, no underline */
.nav-links a:hover {
  color: var(--color-accent);
}

/* Active page: colour + underline */
.nav-links a.active {
  color: var(--color-accent);
}

.nav-links a.active::after {
  width: 100%;
}

/* ── CTA button ── */
.nav-cta {
  display: inline-block;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: #fff !important;
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  letter-spacing: -0.01em;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  white-space: nowrap;
}

.nav-cta:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 113, 227, 0.3);
}

.nav-cta::after {
  display: none !important;
}

/* ── Hamburger button ── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 22px;
  height: 16px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.hamburger span {
  display: block;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

body.nav-open .hamburger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

body.nav-open .hamburger span:nth-child(2) {
  opacity: 0;
}

body.nav-open .hamburger span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Mobile overlay ── */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 998;
  opacity: 0;
  transition: opacity 0.3s ease;
}

body.nav-open .nav-overlay {
  opacity: 1;
}

/* ── Slide-in drawer ── */
.nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 300px;
  height: 100%;
  background: var(--color-surface);
  z-index: 999;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  padding: 1.5rem 2rem 2rem;
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
}

body.nav-open .nav-drawer {
  transform: translateX(0);
}

.nav-drawer-close {
  align-self: flex-end;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.5rem;
  color: var(--color-secondary);
  line-height: 1;
  padding: 0.25rem;
  margin-bottom: 2rem;
  transition: color 0.2s;
}

.nav-drawer-close:hover {
  color: var(--color-primary);
}

.nav-drawer ul {
  list-style: none;
  flex: 1;
}

.nav-drawer ul li {
  margin-bottom: 0.25rem;
}

.nav-drawer ul a {
  display: block;
  text-decoration: none;
  color: var(--color-primary);
  font-size: var(--text-lg);
  font-weight: 500;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--color-border);
  transition: color 0.2s;
}

.nav-drawer ul a:hover {
  color: var(--color-accent);
}

.nav-drawer .drawer-cta {
  display: block;
  margin-top: 2rem;
  padding: 0.85rem;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
  font-size: var(--text-base);
  text-align: center;
  text-decoration: none;
  transition: background 0.2s;
}

.nav-drawer .drawer-cta:hover {
  background: var(--color-accent-hover);
}

/* ── Mobile breakpoint ── */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .nav-overlay {
    display: block;
  }
}

/* Force opaque nav on all pages without a full-page hero section */
body:not(:has(.hero)) header {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom-color: var(--color-border);
}