/* roulang page: index */
:root {
      --primary: #D32F2F;
      --primary-dark: #B71C1C;
      --secondary: #212121;
      --bg: #FAFAFA;
      --white: #FFFFFF;
      --accent: #FFC107;
      --text: #333333;
      --text-light: #666666;
      --border: #E0E0E0;
      --card-bg: #F9F9F9;
      --radius: 12px;
      --radius-btn: 8px;
      --shadow: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.8;
      font-size: 16px;
      scroll-behavior: smooth;
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      z-index: 999;
      transition: background 0.3s, box-shadow 0.3s;
      box-shadow: 0 1px 0 rgba(0,0,0,0.04);
    }
    .navbar.scrolled {
      background: #FFFFFF;
      box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--secondary);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text);
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 0.6rem 1.6rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.1s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }
    .btn-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 0.55rem 1.6rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(211,47,47,0.06);
      border-color: var(--primary-dark);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2.5px;
      background: var(--secondary);
      border-radius: 2px;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 70px;
      left: 0;
      width: 100%;
      background: rgba(20,20,20,0.95);
      backdrop-filter: blur(8px);
      flex-direction: column;
      padding: 2rem;
      gap: 1.5rem;
      z-index: 998;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.2rem;
      font-weight: 500;
    }
    /* Hero */
    .hero {
      padding: 130px 0 80px;
      background: linear-gradient(180deg, #FFF5F5 0%, #FAFAFA 100%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 700;
      color: var(--secondary);
      line-height: 1.3;
      margin-bottom: 1.2rem;
    }
    .hero-title i {
      color: var(--primary);
      font-style: normal;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-light);
      margin-bottom: 2rem;
    }
    .hero-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 360px;
      box-shadow: var(--shadow-hover);
      position: relative;
      overflow: hidden;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(211,47,47,0.15) 0%, transparent 60%);
    }
    /* 通用区块 */
    section {
      padding: 70px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 0.8rem;
      color: var(--secondary);
    }
    .section-desc {
      color: var(--text-light);
      margin-bottom: 2.5rem;
      max-width: 700px;
    }
    /* 核心优势网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.8rem;
    }
    .feature-card {
      background: var(--white);
      padding: 2rem 1.2rem;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      transition: all 0.25s;
      background: var(--card-bg);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 1rem;
    }
    .feature-card h3 {
      font-size: 1.2rem;
      margin-bottom: 0.5rem;
    }
    /* 服务方案对比 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
      align-items: start;
    }
    .plan-card {
      background: white;
      border-radius: var(--radius);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow);
      border: 1px solid var(--border);
      text-align: center;
      transition: all 0.2s;
      position: relative;
    }
    .plan-card.popular {
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-hover);
      transform: scale(1.02);
    }
    .badge {
      background: var(--accent);
      color: #212121;
      font-weight: 700;
      padding: 0.25rem 1rem;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 1rem;
    }
    .plan-price {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--secondary);
    }
    .plan-list {
      list-style: none;
      text-align: left;
      margin: 1.5rem 0;
    }
    .plan-list li {
      padding: 0.4rem 0;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    /* 案例瀑布流 */
    .cases-masonry {
      columns: 3;
      column-gap: 1.5rem;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 1.5rem;
      background: white;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow);
      transition: all 0.2s;
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      position: relative;
      line-height: 0;
    }
    .case-img img {
      width: 100%;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    .case-tag {
      position: absolute;
      top: 12px;
      left: 12px;
      background: var(--accent);
      color: #212121;
      font-weight: 700;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.8rem;
    }
    .case-info {
      padding: 1.2rem;
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius);
      margin-bottom: 0.8rem;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      overflow: hidden;
    }
    .faq-question {
      background: #F5F5F5;
      padding: 1rem 1.5rem;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }
    .faq-item.open .faq-question {
      border-left: 3px solid var(--primary);
      background: #FFF0F0;
    }
    .faq-answer {
      padding: 0 1.5rem;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      background: white;
    }
    .faq-item.open .faq-answer {
      padding: 1rem 1.5rem;
      max-height: 200px;
    }
    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
    }
    .contact-form input, .contact-form textarea {
      width: 100%;
      padding: 0.8rem;
      border: 1px solid var(--border);
      border-radius: var(--radius-btn);
      margin-bottom: 1rem;
      font-family: inherit;
    }
    .contact-form input:focus, .contact-form textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(211,47,47,0.15);
    }
    footer {
      background: var(--secondary);
      color: #ccc;
      padding: 3rem 0 2rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 2rem;
    }
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .cases-masonry { columns: 2; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { grid-template-columns: 1fr; }
      .hero-title { font-size: 2.2rem; }
      .features-grid { grid-template-columns: 1fr; }
      .pricing-grid { grid-template-columns: 1fr; }
      .cases-masonry { columns: 1; }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .container { padding: 0 16px; }
    }