.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(250, 247, 242, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-card-border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--spacing-md);
}

.logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}

.logo__title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.logo__tagline {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.nav__link {
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all var(--transition);
  white-space: nowrap;
}

.nav__link:hover {
  color: var(--color-text);
  background: var(--color-accent-light);
}

.nav__link--active {
  color: var(--color-text);
  background: var(--color-card);
  box-shadow: 0 2px 8px var(--color-shadow);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--spacing-xs);
}

.nav-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

.main {
  padding: var(--spacing-xl) 0 var(--spacing-2xl);
}

.section {
  display: none;
  animation: fadeIn 0.4s ease;
}

.section--active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.section-header {
  margin-bottom: var(--spacing-xl);
}

.section-header__title {
  margin-bottom: var(--spacing-xs);
}

.section-header__subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
}

.hero {
  text-align: center;
  padding: var(--spacing-2xl) 0 var(--spacing-xl);
}

.hero__title {
  margin-bottom: var(--spacing-sm);
}

.hero__subtitle {
  font-size: 1.125rem;
  max-width: 500px;
  margin: 0 auto var(--spacing-xl);
}

.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--spacing-lg);
}

.books-grid--compact {
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--spacing-md);
}

.subsection {
  margin-bottom: var(--spacing-2xl);
}

.subsection__title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid var(--color-card-border);
}

.footer {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-lg);
  color: var(--color-text-muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--color-card-border);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: var(--spacing-md);
    background: rgba(250, 247, 242, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-card-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
  }

  .nav--open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    text-align: center;
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .books-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .books-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
  }

  .hero {
    padding: var(--spacing-xl) 0;
  }
}