@media (max-width: 1200px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 1024px) {
  .section { padding: var(--space-20) 0; }
  .section-lg { padding: var(--space-24) 0; }
  .container { padding: 0 var(--space-6); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hide-tablet { display: none !important; }
}

@media (max-width: 768px) {
  .section { padding: var(--space-16) 0; }
  .section-lg { padding: var(--space-20) 0; }
  .section-header { margin-bottom: var(--space-10); }
  .section-header h2 { font-size: var(--text-3xl); }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .hide-mobile { display: none !important; }
  .show-mobile { display: block !important; }
  .container { padding: 0 var(--space-4); }
  .btn-lg { padding: var(--space-3) var(--space-6); }
  .gap-mobile-0 { gap: 0; }
  .gap-mobile-2 { gap: var(--space-2); }
  .gap-mobile-4 { gap: var(--space-4); }
  .text-center-mobile { text-align: center; }
  .flex-center-mobile { align-items: center; justify-content: center; }
  .heading-xl { font-size: clamp(2rem, 8vw, 3rem); }
}

@media (max-width: 480px) {
  .section { padding: var(--space-12) 0; }
  .container { padding: 0 var(--space-4); }
  .heading-xl { font-size: clamp(1.75rem, 8vw, 2.5rem); }
  .heading-lg { font-size: clamp(1.5rem, 6vw, 2rem); }
  .card { padding: var(--space-4); }
}

/* Header responsive */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  padding: var(--space-4) 0;
  transition: all var(--transition-base);
  background: transparent;
}

.header.scrolled {
  background: rgba(9,9,11,0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3) 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
  text-decoration: none;
}

.header-logo svg {
  width: 32px;
  height: 32px;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.header-nav a {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 450;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.header-nav a:hover,
.header-nav a.active {
  color: var(--color-text);
  background: rgba(255,255,255,0.05);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
  background: none;
  border: none;
}

.mobile-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.mobile-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}

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

.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(9,9,11,0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: var(--z-overlay);
  padding: 100px var(--space-6) var(--space-6);
  flex-direction: column;
  gap: var(--space-2);
  overflow-y: auto;
}

.mobile-menu.active {
  display: flex;
}

.mobile-menu a {
  padding: var(--space-4);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.mobile-menu a:hover {
  color: var(--color-text);
  background: rgba(255,255,255,0.05);
}

.mobile-menu .btn {
  margin-top: var(--space-4);
  text-align: center;
}

@media (max-width: 768px) {
  .header-nav,
  .header-actions .btn-ghost,
  .header-actions .btn-secondary {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }
}

/* Footer */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-16) 0 var(--space-8);
  background: var(--color-bg-subtle);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(4, 1fr);
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-brand p {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  margin-top: var(--space-4);
  max-width: 280px;
}

.footer-col h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  letter-spacing: 0.02em;
}

.footer-col a {
  display: block;
  padding: var(--space-1) 0;
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--color-text);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.footer-bottom p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.footer-social {
  display: flex;
  gap: var(--space-3);
}

.footer-social a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-tertiary);
  transition: all var(--transition-fast);
  border: 1px solid var(--color-border);
}

.footer-social a:hover {
  color: var(--color-text);
  background: rgba(255,255,255,0.05);
  border-color: var(--color-border-strong);
}

.footer-social svg {
  width: 16px;
  height: 16px;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }

  .footer-brand {
    grid-column: span 2;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-brand {
    grid-column: span 1;
  }
}