/* roulang page: index */
:root {
      --primary-deep: #0A1F3F;
      --accent-orange: #FF4C29;
      --bg-light: #F8F9FA;
      --white: #FFFFFF;
      --text-dark: #1a1f2b;
      --text-soft: #5a6170;
      --border-light: #e2e6ed;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 32px rgba(10, 31, 63, 0.08);
      --radius-lg: 16px;
      --radius-md: 8px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', 'Inter', system-ui, -apple-system, sans-serif;
      --transition: 0.2s ease;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      letter-spacing: -0.01em;
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
    }

    h2 {
      font-size: 36px;
      margin-bottom: 16px;
      color: var(--primary-deep);
    }

    h3 {
      font-size: 24px;
      margin-bottom: 12px;
      color: var(--primary-deep);
    }

    p {
      color: var(--text-soft);
      margin-bottom: 16px;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: all var(--transition);
      border: 2px solid transparent;
      letter-spacing: 0.3px;
    }

    .btn-primary {
      background-color: var(--accent-orange);
      color: white;
      border-color: var(--accent-orange);
    }

    .btn-primary:hover {
      background-color: #E63E1C;
      border-color: #E63E1C;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255, 76, 41, 0.3);
    }

    .btn-outline {
      background: transparent;
      border-color: var(--primary-deep);
      color: var(--primary-deep);
    }

    .btn-outline:hover {
      background-color: var(--primary-deep);
      color: white;
      border-color: var(--primary-deep);
      transform: translateY(-2px);
    }

    /* 导航 */
    .navbar {
      background: var(--white);
      position: sticky;
      top: 0;
      z-index: 1000;
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      backdrop-filter: blur(10px);
      background: rgba(255,255,255,0.95);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 32px;
      max-width: 1280px;
      margin: 0 auto;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 24px;
      color: var(--primary-deep);
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--accent-orange);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 18px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
      padding: 4px 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-orange);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-orange);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--primary-deep);
      transition: var(--transition);
    }

    /* Hero */
    .hero {
      padding: 120px 0 100px;
      background: linear-gradient(135deg, #f4f6fc 0%, #ffffff 100%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-content h1 {
      color: var(--primary-deep);
      margin-bottom: 20px;
    }

    .hero-content .subtitle {
      font-size: 18px;
      color: var(--text-soft);
      margin-bottom: 32px;
      max-width: 90%;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 420px;
      box-shadow: var(--shadow-hover);
      position: relative;
      overflow: hidden;
    }

    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(10,31,63,0.25) 0%, rgba(0,0,0,0.1) 100%);
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }

    .section-title p {
      max-width: 700px;
      margin: 0 auto;
      font-size: 17px;
    }

    /* 核心优势网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }

    .feature-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      text-align: center;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .feature-icon {
      font-size: 40px;
      color: var(--accent-orange);
      margin-bottom: 20px;
      display: block;
    }

    .feature-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }

    /* 案例瀑布流 */
    .cases-masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .case-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }

    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      height: 220px;
      background-size: cover;
      background-position: center;
    }

    .case-info {
      padding: 24px;
    }

    .case-tag {
      display: inline-block;
      background: rgba(255,76,41,0.1);
      color: var(--accent-orange);
      font-size: 13px;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 12px;
    }

    /* 方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }

    .compare-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 40px 32px;
      box-shadow: var(--shadow-card);
    }

    .compare-card.recommended {
      border: 2px solid var(--accent-orange);
      position: relative;
      transform: scale(1.02);
    }

    .badge {
      background: var(--accent-orange);
      color: white;
      font-size: 14px;
      font-weight: 600;
      padding: 6px 20px;
      border-radius: 20px;
      position: absolute;
      top: -14px;
      right: 30px;
    }

    .compare-list {
      list-style: none;
      margin-top: 24px;
    }

    .compare-list li {
      padding: 12px 0;
      border-bottom: 1px solid var(--border-light);
      display: flex;
      justify-content: space-between;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--white);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }

    .faq-question {
      padding: 22px 28px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 16px;
      cursor: pointer;
      background: var(--white);
      transition: background var(--transition);
    }

    .faq-question:hover {
      background: #f9fafb;
    }

    .faq-q {
      color: var(--accent-orange);
      font-weight: 700;
      font-size: 20px;
    }

    .faq-answer {
      padding: 0 28px 22px;
      color: var(--text-soft);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-band {
      background: var(--primary-deep);
      color: white;
      text-align: center;
      padding: 90px 0;
      border-radius: 32px;
      margin: 40px 0;
    }

    .cta-band h2 {
      color: white;
    }

    /* 表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
    }

    .form-group input,
    .form-group textarea {
      width: 100%;
      padding: 14px 18px;
      border: none;
      border-bottom: 2px solid #e0e0e0;
      background: var(--white);
      font-size: 16px;
      border-radius: 0;
      transition: border var(--transition);
      font-family: var(--font-sans);
    }

    .form-group input:focus,
    .form-group textarea:focus {
      outline: none;
      border-bottom-color: var(--primary-deep);
    }

    .contact-info {
      background: var(--white);
      padding: 40px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
    }

    /* 页脚 */
    .footer {
      background: var(--primary-deep);
      color: #ccd5e0;
      padding: 70px 0 30px;
      margin-top: 60px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer a {
      color: #ccd5e0;
    }

    .footer a:hover {
      color: white;
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.15);
      margin-top: 50px;
      padding-top: 25px;
      text-align: center;
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .cases-masonry { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { grid-template-columns: 1fr; gap: 40px; }
      .hero { padding: 80px 0 60px; }
      .features-grid { grid-template-columns: 1fr; }
      .cases-masonry { grid-template-columns: 1fr; }
      .compare-grid { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }