/* ============================================
   COMPONENT — Header / Navigation
   ============================================ */

.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease);
}
.header.is-scrolled {
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(16px);
  box-shadow: 0 2px 0 var(--color-blue);
}

.header__inner {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--space-8);
  height: 72px;
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

/* Logo */
.header__logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  line-height: 1;
  flex-shrink: 0;
}
.logo__main {
  display: flex;
  align-items: baseline;
  gap: 0;
}
.logo__rk {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--color-blue-light);
  letter-spacing: 3px;
  line-height: 1;
}
.logo__name {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--color-red);
  letter-spacing: 3px;
  line-height: 1;
}
.logo__tagline {
  font-size: 0.58rem;
  font-weight: 400;
  letter-spacing: 5px;
  text-transform: uppercase;
  color: var(--color-white);
  transition: color var(--duration) var(--ease);
  margin-top: 2px;
  text-align: center;
  width: 100%;
}
.header.is-scrolled .logo__tagline { color: var(--color-gray); }

/* Nav */
.header__nav {
  display: flex;
  gap: var(--space-8);
  margin-left: auto;
}
.header__nav a {
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  color: rgba(255,255,255,0.9);
  letter-spacing: 0.3px;
  position: relative;
  transition: color var(--duration) var(--ease);
}
.header__nav a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -3px;
  height: 1.5px;
  background: var(--color-red);
  transform: scaleX(0);
  transition: transform var(--duration) var(--ease);
  transform-origin: left;
}
.header__nav a:hover { color: var(--color-red-light); }
.header__nav a:hover::after { transform: scaleX(1); }
.header.is-scrolled .header__nav a { color: var(--color-dark); }
.header.is-scrolled .header__nav a:hover { color: var(--color-red); }

/* CTA */
.header__cta {
  flex-shrink: 0;
}

/* Hamburger */
.header__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  margin-left: auto;
}
.header__burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: background var(--duration) var(--ease);
}
.header.is-scrolled .header__burger span { background: var(--color-dark); }

/* Mobile nav */
.header__mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) var(--space-8) var(--space-6);
  gap: var(--space-1);
  box-shadow: var(--shadow-lg);
}
.header__mobile-nav.is-open { display: flex; }
.header__mobile-nav a {
  text-decoration: none;
  color: var(--color-dark);
  font-weight: 500;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-base);
}
.header__mobile-cta {
  margin-top: var(--space-3);
}

@media (max-width: 900px) {
  .header__nav, .header__cta { display: none; }
  .header__burger { display: flex; }
}
@media (max-width: 480px) {
  .header__inner { padding: 0 var(--space-5); }
  .logo__name { font-size: 2rem; }
  .logo__rk { font-size: 2rem; }
}