.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(10, 10, 15, 0.7);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

[data-theme="light"] .header {
  background: rgba(248, 250, 252, 0.85);
}

.header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
}

.logo__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: #fff;
  font-size: 0.9rem;
}

.logo__text {
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.nav__list {
  display: flex;
  gap: 8px;
}

.nav__link {
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--text-primary);
  background: var(--bg-card);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: var(--transition);
}

.theme-toggle:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

[data-theme="dark"] .theme-toggle__sun { display: block; }
[data-theme="dark"] .theme-toggle__moon { display: none; }
[data-theme="light"] .theme-toggle__sun { display: none; }
[data-theme="light"] .theme-toggle__moon { display: block; }

.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
}

.burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.burger.is-active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.is-active span:nth-child(2) { opacity: 0; }
.burger.is-active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

main {
  padding-top: var(--header-height);
}

.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
  margin-top: 80px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer__desc {
  color: var(--text-muted);
  margin-top: 16px;
  max-width: 320px;
}

.footer__title {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.footer__links li {
  margin-bottom: 10px;
}

.footer__links a {
  color: var(--text-muted);
  transition: var(--transition);
}

.footer__links a:hover { color: var(--accent-primary); }

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer__made {
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

@media (max-width: 1024px) {
  .header__cta { display: none; }
}

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

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px 24px;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
  }

  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
    box-shadow: var(--shadow-lg);
  }

  body.nav-open {
    overflow: hidden;
  }

  .nav__list {
    flex-direction: column;
    gap: 4px;
  }

  .nav__link {
    display: block;
    padding: 12px 16px;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}