/* 响应式样式 */

/* 超大屏幕 (1400px+) */
@media (min-width: 1400px) {
  .container {
    max-width: 1320px;
  }
}

/* 大屏幕 (1200px - 1399px) */
@media (max-width: 1399px) {
  .grid-4 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 中等屏幕 (1024px - 1199px) */
@media (max-width: 1199px) {
  .nav-menu {
    gap: 20px;
  }
  
  .nav-menu li a {
    padding: 6px 12px;
    font-size: 0.95rem;
  }
  
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .hero-subtitle {
    font-size: 1.3rem;
  }
}

/* 小屏幕 - 平板 (768px - 1023px) */
@media (max-width: 1023px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: rgba(15, 23, 42, 0.98);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: 40px;
    gap: 0;
    transition: left 0.3s ease;
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .nav-menu li {
    width: 100%;
    text-align: center;
  }
  
  .nav-menu li a {
    display: block;
    padding: 20px;
    font-size: 1.2rem;
    border-bottom: 1px solid var(--border-color);
  }
  
  .hamburger {
    display: flex;
  }
  
  .hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
  }
  
  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }
  
  .hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.2rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    padding: 40px 20px;
  }
  
  .analysis-grid {
    grid-template-columns: 1fr;
  }
}

/* 小屏幕 - 手机横屏 (480px - 767px) */
@media (max-width: 767px) {
  .container {
    padding: 80px 15px 40px;
  }
  
  .logo h2 {
    font-size: 1.5rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .btn {
    padding: 10px 24px;
    font-size: 1rem;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .card {
    padding: 20px;
  }
  
  .feature-card {
    padding: 20px;
  }
  
  .feature-icon {
    width: 60px;
    height: 60px;
  }
  
  .feature-title {
    font-size: 1.3rem;
  }
  
  .analysis-content {
    padding: 20px;
  }
  
  .analysis-title {
    font-size: 1.3rem;
  }
}

/* 超小屏幕 - 手机竖屏 (< 480px) */
@media (max-width: 479px) {
  .nav-container {
    padding: 12px 15px;
  }
  
  .logo h2 {
    font-size: 1.3rem;
  }
  
  .hero-section {
    height: 500px;
  }
  
  .hero-content {
    padding-top: 150px;
  }
  
  .hero-title {
    font-size: 1.6rem;
  }
  
  .hero-subtitle {
    font-size: 0.95rem;
  }
  
  .section-title {
    font-size: 1.5rem;
    margin-bottom: 30px;
  }
  
  .features-grid {
    padding: 30px 15px;
    gap: 20px;
  }
  
  .feature-card {
    padding: 15px;
  }
  
  .feature-icon {
    width: 50px;
    height: 50px;
  }
  
  .feature-title {
    font-size: 1.2rem;
  }
  
  .feature-desc {
    font-size: 0.9rem;
  }
  
  .analysis-section {
    padding: 40px 15px;
  }
  
  .analysis-grid {
    gap: 20px;
  }
  
  .analysis-card {
    border-radius: 8px;
  }
  
  .analysis-image {
    height: 180px;
  }
  
  .analysis-content {
    padding: 15px;
  }
  
  .analysis-title {
    font-size: 1.2rem;
  }
  
  .analysis-excerpt {
    font-size: 0.9rem;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 15px;
  }
  
  footer {
    padding: 30px 15px;
    font-size: 0.85rem;
  }
}

/* 打印样式 */
@media print {
  .navbar,
  .hamburger,
  .btn,
  footer {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .container {
    padding: 20px;
    max-width: 100%;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}