/* ===== STICKY HEADER ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  transition: all var(--transition-base);
  background: transparent;
}

.site-header.scrolled {
  height: var(--header-height-scrolled);
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  z-index: 1001;
  flex-shrink: 0;
}

.logo-soft {
  color: #FFFFFF;
}

.logo-click {
  background: var(--cta-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-ai {
  color: var(--text-muted);
}

.logo-icon {
  width: 28px;
  height: 28px;
  margin-left: 4px;
}

/* Navigation */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
  text-decoration: none;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--cta-gradient);
  transition: width var(--transition-base);
  border-radius: 1px;
}

.nav-links a:hover {
  color: var(--text-light);
}

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

/* Header CTA */
.header-cta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
  padding: 0;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-light);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.hamburger span:nth-child(1) {
  margin-bottom: 6px;
}

.hamburger span:nth-child(2) {
  margin-bottom: 6px;
}

/* Hamburger active state */
.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 6px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -6px);
}

/* Mobile Menu Overlay */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  background: rgba(7, 17, 51, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-menu.open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu-inner {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100%;
  gap: var(--space-xl);
}

.mobile-menu-inner a {
  color: var(--text-light);
  font-size: var(--font-size-2xl);
  font-weight: 600;
  text-decoration: none;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.4s ease, transform 0.4s ease, color var(--transition-fast);
}

.mobile-menu.open .mobile-menu-inner a {
  opacity: 1;
  transform: translateY(0);
}

.mobile-menu.open .mobile-menu-inner a:nth-child(1) { transition-delay: 100ms; }
.mobile-menu.open .mobile-menu-inner a:nth-child(2) { transition-delay: 150ms; }
.mobile-menu.open .mobile-menu-inner a:nth-child(3) { transition-delay: 200ms; }
.mobile-menu.open .mobile-menu-inner a:nth-child(4) { transition-delay: 250ms; }
.mobile-menu.open .mobile-menu-inner a:nth-child(5) { transition-delay: 300ms; }
.mobile-menu.open .mobile-menu-inner a:nth-child(6) { transition-delay: 350ms; }
.mobile-menu.open .mobile-menu-inner a:nth-child(7) { transition-delay: 400ms; }
.mobile-menu.open .mobile-menu-inner a:nth-child(8) { transition-delay: 450ms; }

.mobile-menu-inner a:hover {
  color: var(--accent-violet);
}