/* ========================================
   DDIT — Header / Navigation
   ======================================== */

.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--dark);
  border-block-end: 1px solid rgba(255,255,255,0.06);
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

/* Nav links white on dark header */
.header .nav-link { color: rgba(255,255,255,0.65); }
.header .nav-link:hover { color: #fff; background: rgba(255,255,255,0.06); }
.header .nav-link.active { color: #fff; }
.header .nav-link.active::after { background: var(--yellow); }

/* Gradient accent line — appears on scroll */
.header::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background: var(--grad);
  opacity: 0;
  transition: opacity 0.35s var(--ease);
  pointer-events: none;
}

.header.scrolled {
  border-block-end-color: transparent;
  box-shadow: 0 4px 24px rgba(20, 16, 30, 0.10);
}
.header.scrolled::after { opacity: 1; }

/* Inner container */
.header-inner {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* ---- Logo ---- */
.logo { flex-shrink: 0; display: block; }

.logo-img {
  height: 46px;
  width: auto;
  border-radius: 8px;
  display: block;
  transition: opacity 0.2s;
}
.logo-img:hover { opacity: 0.82; }

/* ---- Navigation ---- */
.nav {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
  justify-content: center;
}

.nav-link {
  position: relative;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--ink-2);
  padding: 7px 11px;
  border-radius: var(--r1);
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
  display: block;
}

.nav-link:hover {
  color: var(--ink);
  background: var(--bg-2);
}

.nav-link.active {
  color: var(--ink);
  font-weight: 600;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  right: 8px; left: 8px;
  height: 2px;
  background: var(--grad);
  border-radius: 1px;
}

/* ---- Header CTA ---- */
.btn-header {
  flex-shrink: 0;
  padding: 9px 20px;
  font-size: 14px;
  border-radius: var(--r1);
}

/* ---- Hamburger ---- */
.menu-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  padding: 6px;
  gap: 5px;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: rgba(255,255,255,0.8);
  border-radius: 1px;
  transition: var(--t);
  transform-origin: center;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ======================================================
   Mobile Navigation
   ====================================================== */
@media (max-width: 900px) {
  .menu-toggle { display: flex; }
  .btn-header  { display: none; }

  .nav {
    display: none;
    position: absolute;
    top: 72px; right: 0; left: 0;
    background: var(--dark);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 0 16px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    box-shadow: 0 8px 28px rgba(0,0,0,0.35);
    z-index: 999;
  }

  .nav.active { display: flex; }

  .nav-link {
    padding: 14px 24px;
    border-radius: 0;
    font-size: 16px;
    border-bottom: 1px solid var(--line);
  }

  .nav-link:last-child { border-bottom: none; }

  .nav-link.active::after { display: none; }
  .nav-link.active { background: var(--bg-2); }
}

@media (max-width: 480px) {
  .header-inner { height: 62px; }
  .nav { top: 62px; }
  .logo-img { height: 38px; }
}