/* roulang page: index */
:root {
      --primary: #0A6EFF;
      --primary-dark: #0856CC;
      --primary-light: rgba(10,110,255,0.08);
      --accent: #FF5E13;
      --accent-dark: #E04A00;
      --deep-black: #0B0F19;
      --bg-white: #FFFFFF;
      --bg-light: #F4F7FC;
      --text-main: #1A1F2E;
      --text-secondary: #5A6070;
      --text-muted: #9299A6;
      --border-light: #E2E8F0;
      --card-border: #E8EDF3;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-card: 0 2px 12px rgba(10,110,255,0.06);
      --shadow-hover: 0 8px 28px rgba(10,110,255,0.12);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --transition: 0.2s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      color: var(--text-main);
      background: var(--bg-white);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: #FFFFFF;
      border-bottom: 1px solid rgba(0,0,0,0.04);
      box-shadow: 0 1px 4px rgba(0,0,0,0.02);
      z-index: 1000;
      transition: box-shadow 0.2s;
    }
    .header.scrolled {
      box-shadow: 0 4px 16px rgba(0,0,0,0.06);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 8px;
      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;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding: 8px 0;
      transition: color var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      transition: background var(--transition), transform var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background var(--transition), color var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary-light);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-main);
      transition: all 0.3s;
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: var(--bg-white);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-title {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-main);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      background: linear-gradient(135deg, rgba(10,110,255,0.12) 0%, rgba(10,110,255,0.02) 100%);
    }
    .hero-visual img {
      width: 100%;
      height: auto;
      object-fit: cover;
      border-radius: 24px;
      mix-blend-mode: normal;
    }
    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    .section-alt {
      background: var(--bg-light);
    }
    .section-title {
      font-size: 38px;
      font-weight: 600;
      text-align: center;
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .section-sub {
      font-size: 18px;
      color: var(--text-secondary);
      text-align: center;
      max-width: 680px;
      margin: 0 auto 56px;
    }
    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .highlight-card {
      background: var(--bg-white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all var(--transition);
      box-shadow: var(--shadow-card);
    }
    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .highlight-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
      font-size: 24px;
    }
    .highlight-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .highlight-card p {
      color: var(--text-secondary);
      font-size: 15px;
    }
    /* 方案对比 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .solution-card {
      background: white;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      position: relative;
      transition: all var(--transition);
      box-shadow: var(--shadow-card);
    }
    .solution-card.featured {
      border: 2px solid var(--primary);
      box-shadow: 0 8px 24px rgba(10,110,255,0.1);
    }
    .badge {
      background: var(--accent);
      color: white;
      font-size: 13px;
      font-weight: 600;
      padding: 4px 14px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      right: 20px;
    }
    .solution-name {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .solution-list {
      list-style: none;
      margin: 24px 0;
    }
    .solution-list li {
      padding: 8px 0;
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--text-secondary);
    }
    .solution-list li::before {
      content: "✓";
      color: var(--primary);
      font-weight: 700;
    }
    .price-tag {
      font-weight: 700;
      font-size: 20px;
      color: var(--text-main);
      margin: 20px 0 16px;
    }
    /* 案例瀑布流 */
    .cases-masonry {
      columns: 3;
      column-gap: 28px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 28px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--card-border);
      transition: all var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 22px;
    }
    .case-tag {
      background: var(--accent);
      color: white;
      font-size: 13px;
      padding: 2px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }
    .case-title {
      font-weight: 600;
      font-size: 18px;
      margin-bottom: 6px;
    }
    /* 信任数据 */
    .trust {
      background: var(--deep-black);
      color: white;
    }
    .trust-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
      text-align: center;
    }
    .trust-number {
      font-size: 48px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary), #6BB5FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .trust-label {
      color: rgba(255,255,255,0.7);
      margin-top: 8px;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-light);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 28px 20px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .faq-item.open .faq-question {
      color: var(--primary);
    }
    /* CTA */
    .cta-banner {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 24px;
      padding: 64px 40px;
      text-align: center;
      color: white;
    }
    .cta-title {
      font-size: 36px;
      font-weight: 700;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      padding: 14px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      display: inline-block;
      margin-top: 24px;
    }
    /* 页脚 */
    .footer {
      background: var(--deep-black);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: rgba(255,255,255,0.7);
      transition: color 0.2s;
    }
    .footer a:hover {
      color: var(--primary);
    }
    .copyright {
      text-align: center;
      padding-top: 32px;
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 32px;
      color: rgba(255,255,255,0.5);
    }
    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      .hero-grid { grid-template-columns: 1fr; gap: 40px; }
      .highlights-grid { grid-template-columns: repeat(2,1fr); }
      .solutions-grid { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto; }
      .cases-masonry { columns: 2; }
      .trust-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 767px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.1);
      }
      .mobile-menu.open { display: flex; }
      .hero { padding: 120px 0 60px; }
      .hero-title { font-size: 34px; }
      .highlights-grid,
      .trust-grid { grid-template-columns: 1fr; }
      .cases-masonry { columns: 1; }
      .footer-grid { grid-template-columns: 1fr; }
    }