/* roulang page: index */
:root {
      --primary: #FF6B6B;
      --primary-dark: #e05555;
      --secondary: #4A3A6F;
      --secondary-light: rgba(74, 58, 111, 0.1);
      --accent: #B2FF59;
      --accent-glow: rgba(178, 255, 89, 0.6);
      --warm-bg: #FFF3E0;
      --gray-50: #F3F4F6;
      --gray-200: #E5E7EB;
      --gray-500: #6B7280;
      --gray-800: #2D2D2D;
      --white: #FFFFFF;
      --radius-xl: 24px;
      --radius-lg: 20px;
      --radius-md: 12px;
      --radius-full: 50px;
      --shadow-sm: 0 6px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 20px 35px -12px rgba(74, 58, 111, 0.18);
      --shadow-hover: 0 30px 45px -15px rgba(74, 58, 111, 0.22);
      --font-brand: 'Poppins', 'Noto Sans SC', sans-serif;
      --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition: 0.25s ease-out;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--white);
      color: var(--gray-800);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, .brand-text {
      font-family: var(--font-brand);
      font-weight: 700;
      letter-spacing: -0.3px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      font-weight: 600;
      border: none;
      background: transparent;
      transition: all 0.2s ease;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(74, 58, 111, 0.08);
      transition: background 0.2s;
    }
    .nav-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 24px;
      flex-wrap: wrap;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      font-size: 28px;
      color: var(--primary);
    }
    .logo-text {
      font-family: var(--font-brand);
      font-weight: 800;
      font-size: 1.5rem;
      color: var(--secondary);
      letter-spacing: -0.5px;
    }
    .logo-text span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-weight: 600;
      color: var(--secondary);
    }
    .nav-links a {
      padding: 6px 0;
      position: relative;
      font-size: 0.95rem;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .trend-tag {
      background: var(--accent);
      color: var(--secondary);
      border-radius: 30px;
      padding: 4px 14px;
      font-size: 0.8rem;
      font-weight: 700;
      margin-left: 6px;
    }
    .search-icon {
      font-size: 1.2rem;
      color: var(--secondary);
      cursor: pointer;
      margin-left: 8px;
    }
    .mobile-menu-btn {
      display: none;
      font-size: 1.6rem;
      background: none;
      border: none;
      color: var(--secondary);
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 12px;
        padding: 20px 0 10px;
      }
      .nav-links.show {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
    }
    /* 首屏 */
    .hero {
      background: linear-gradient(135deg, #FFF3E0 0%, #ffffff 100%);
      padding: 60px 0 80px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 45%;
    }
    .hero-right {
      flex: 1 1 45%;
      position: relative;
    }
    .hero h1 {
      font-size: clamp(2.4rem, 5vw, 3.8rem);
      font-weight: 800;
      color: var(--secondary);
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero h1 span {
      color: var(--primary);
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--gray-500);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 34px;
      border-radius: var(--radius-full);
      font-weight: 700;
      box-shadow: 0 10px 18px -8px rgba(255,107,107,0.5);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 18px 25px -10px rgba(255,107,107,0.6);
    }
    .btn-outline {
      border: 2px solid var(--secondary);
      color: var(--secondary);
      padding: 14px 34px;
      border-radius: var(--radius-full);
      font-weight: 700;
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--secondary);
      color: white;
      transform: translateY(-2px);
    }
    .hero-img-card {
      background: white;
      border-radius: 32px;
      overflow: hidden;
      box-shadow: var(--shadow-md);
      transform: rotate(1deg);
    }
    .hero-img-card img {
      width: 100%;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    .float-badge {
      position: absolute;
      bottom: -30px;
      left: -20px;
      background: var(--accent);
      color: var(--secondary);
      font-weight: 800;
      padding: 10px 22px;
      border-radius: 40px;
      box-shadow: 0 12px 25px rgba(178,255,89,0.5);
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .float-badge {
        position: static;
        margin-top: 15px;
      }
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-desc {
      color: var(--gray-500);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 50px;
    }
    /* Highlights 网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: white;
      border-radius: var(--radius-xl);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .highlight-card.large {
      grid-column: span 2;
    }
    .highlight-icon {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 15px;
    }
    .highlight-card h3 {
      font-size: 1.4rem;
      margin-bottom: 10px;
    }
    .data-badge {
      margin-top: auto;
      display: flex;
      align-items: baseline;
      gap: 6px;
      font-weight: 700;
      color: var(--primary);
      font-size: 1.5rem;
    }
    @media (max-width: 768px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
      .highlight-card.large {
        grid-column: span 1;
      }
    }
    /* 案例瀑布 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
      grid-auto-rows: 320px;
    }
    .case-card {
      background: white;
      border-radius: 28px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: 0.2s;
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 65%;
      overflow: hidden;
      position: relative;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .case-card:hover .case-img img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 18px;
      background: white;
    }
    .case-info h4 {
      font-weight: 700;
      margin-bottom: 6px;
    }
    .tag {
      background: var(--secondary-light);
      color: var(--secondary);
      border-radius: 30px;
      padding: 4px 14px;
      font-size: 0.8rem;
    }
    /* 方案对比 */
    .compare-panel {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .plan-card {
      background: white;
      border-radius: 28px;
      padding: 32px 24px;
      flex: 1 1 260px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--gray-200);
    }
    .plan-card.recommended {
      background: rgba(255,107,107,0.04);
      border: 2px solid var(--primary);
      position: relative;
    }
    .badge-pop {
      background: var(--primary);
      color: white;
      border-radius: 30px;
      padding: 4px 14px;
      font-size: 0.8rem;
      position: absolute;
      top: -14px;
      right: 20px;
    }
    .plan-price {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--secondary);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--gray-50);
      border-radius: 18px;
      margin-bottom: 16px;
      padding: 20px 24px;
      cursor: pointer;
      transition: background 0.2s;
    }
    .faq-item.active {
      background: white;
      box-shadow: var(--shadow-sm);
    }
    .faq-q {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
    }
    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--gray-500);
    }
    .faq-item.active .faq-a {
      max-height: 200px;
      margin-top: 14px;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(120deg, #4A3A6F 0%, #FF6B6B 100%);
      color: white;
      text-align: center;
      border-radius: 40px;
      margin: 40px 24px;
      padding: 70px 24px;
    }
    .footer {
      background: #2D2D2D;
      color: #ccc;
      padding: 60px 24px 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }