/* ============================================
   Responsive Styles
   ============================================ */

@media (max-width: 1024px) {
  .layout {
    padding: 16px 12px 32px;
  }

  .content-card {
    padding: 28px 24px;
  }

  .sidebar {
    width: 220px;
    min-width: 220px;
  }
}

@media (max-width: 768px) {
  .hero {
    min-height: 46vh;
    padding: 40px 20px 36px;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .hero-subtitle {
    font-size: 1rem;
    letter-spacing: 1px;
  }

  .hero-btn {
    padding: 10px 28px;
    font-size: 14px;
  }

  .sidebar-toggle {
    display: flex;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: -280px;
    width: 270px;
    min-width: 270px;
    height: 100vh;
    max-height: 100vh;
    z-index: 160;
    border-radius: 0;
    transition: left var(--transition-normal);
    box-shadow: var(--shadow-float);
  }

  .sidebar.open {
    left: 0;
  }

  .sidebar-overlay.visible {
    display: block;
  }

  .layout {
    flex-direction: column;
    padding: 12px 8px 24px;
    gap: 0;
  }

  .content-card {
    padding: 20px 16px;
  }

  .md-body h1 {
    font-size: 22px;
  }

  .md-body h2 {
    font-size: 19px;
  }

  .md-body h3 {
    font-size: 16px;
  }

  .md-body table {
    font-size: 12.5px;
  }

  .md-body thead th,
  .md-body tbody td {
    padding: 8px 10px;
  }

  .back-to-top {
    right: 12px;
    bottom: 20px;
    width: 38px;
    height: 38px;
  }

  .theme-toggle {
    width: 36px;
    height: 36px;
  }

  .jieyun-lookup {
    padding: 14px;
  }

  .jieyun-lookup-row {
    grid-template-columns: 1fr;
  }

  .jieyun-lookup-button {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.5rem;
  }

  .hero-subtitle {
    font-size: 0.9rem;
  }

  .hero-btn {
    padding: 10px 24px;
    font-size: 14px;
  }

  .content-card {
    padding: 16px 12px;
  }

  .md-body table {
    font-size: 12px;
  }

  .copy-btn {
    opacity: 1;
  }
}