.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  padding-block: var(--space-sm);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: 0.6rem 0.9rem 0.6rem 1.4rem;
  border-radius: var(--radius-pill);
  background: var(--surface);
  border: 1px solid var(--surface-border);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
}

.wordmark {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.wordmark span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.main-nav ul {
  display: flex;
  gap: var(--space-md);
}

.main-nav a {
  font-size: 0.95rem;
  color: var(--text-secondary);
  position: relative;
  padding-block: 0.2rem;
  transition: color var(--dur-fast) var(--ease-out);
}

.main-nav a:hover {
  color: var(--text-primary);
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -3px;
  height: 2px;
  background: var(--gradient-accent);
  transition: right var(--dur-med) var(--ease-out);
}

.main-nav a:hover::after {
  right: 0;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.theme-toggle,
.nav-toggle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--surface-border);
  align-items: center;
  justify-content: center;
  transition: border-color var(--dur-fast) var(--ease-out);
}

.theme-toggle {
  display: inline-flex;
}

.nav-toggle {
  display: none;
}

.theme-toggle:hover,
.nav-toggle:hover {
  border-color: var(--blue-deep);
}

.theme-toggle img {
  width: 19px;
  height: 19px;
}

.nav-toggle img {
  width: 18px;
  height: 18px;
}

.theme-toggle .icon-moon,
.nav-toggle .icon-close {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: block;
}

.nav-toggle[aria-expanded="true"] .icon-menu {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

.hero {
  position: relative;
  padding-block: var(--space-2xl) var(--space-xl);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: var(--space-lg);
}

.hero-copy h1 {
  font-size: clamp(2.4rem, 4.6vw, 3.8rem);
  max-width: 15ch;
}

.hero-copy p {
  margin-top: var(--space-md);
  max-width: 46ch;
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.hero-actions {
  margin-top: var(--space-lg);
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.floating-logo-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 1200px;
}

.floating-logo {
  width: clamp(220px, 20vw, 340px);
  aspect-ratio: 480 / 600;
  margin-inline: auto;
  position: relative;
  transition: transform var(--dur-fast) ease-out;
  transform-style: preserve-3d;
  will-change: transform;
}

.floating-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .floating-logo-wrap {
    display: none;
  }
}

@media (max-width: 780px) {
  .hero {
    padding-block: var(--space-lg) var(--space-md);
  }

  .main-nav {
    position: fixed;
    inset: 5.2rem var(--space-md) auto;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-md);
    border-radius: var(--radius-md);
    background: var(--surface-menu);
    border: 1px solid var(--surface-border);
    box-shadow: var(--shadow-soft);
    backdrop-filter: blur(28px) saturate(140%);
    -webkit-backdrop-filter: blur(28px) saturate(140%);
    transform: translateY(-14px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform var(--dur-med) var(--ease-out), opacity var(--dur-med) var(--ease-out), visibility 0s linear var(--dur-med);
  }

  .main-nav[data-open="true"] {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: transform var(--dur-med) var(--ease-out), opacity var(--dur-med) var(--ease-out), visibility 0s;
  }

  .main-nav ul {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .nav-toggle {
    display: inline-flex;
  }
}