/* roulang page: index */
:root {
      --primary-deep: #4A0E5C;
      --primary-dark: #2D083A;
      --accent-gold: #F5A623;
      --accent-gold-dark: #E09510;
      --bg-light: #FAF7FC;
      --white: #FFFFFF;
      --text-main: #333333;
      --text-secondary: #666666;
      --text-light: #999999;
      --border-light: rgba(0,0,0,0.06);
      --shadow-card: 0 8px 30px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 16px 40px rgba(0,0,0,0.08);
      --radius-lg: 20px;
      --radius-btn: 50px;
      --radius-hero: 32px;
      --transition: 0.3s ease;
      --font-stack: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .top-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.02);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--accent-gold);
      font-size: 2rem;
    }
    .desktop-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .desktop-links a {
      font-weight: 500;
      color: var(--text-main);
      font-size: 0.95rem;
      position: relative;
    }
    .desktop-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: var(--transition);
    }
    .desktop-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-dark));
      color: var(--white);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 12px rgba(245,166,35,0.3);
    }
    .btn-primary:hover {
      transform: scale(1.04);
      box-shadow: 0 8px 18px rgba(245,166,35,0.4);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
    }
    .btn-outline:hover {
      background: var(--primary-deep);
      color: white;
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
      cursor: pointer;
    }
    .mobile-menu-overlay {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(15px);
      z-index: 99;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 40px;
      font-size: 1.5rem;
      font-weight: 600;
    }
    .mobile-menu-overlay.active {
      display: flex;
    }
    .mobile-menu-overlay a {
      color: var(--primary-deep);
    }
    /* 底部 Tab (移动端) */
    .mobile-bottom-tab {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 -4px 15px rgba(0,0,0,0.04);
      z-index: 100;
      justify-content: space-around;
      align-items: center;
      border-top: 1px solid var(--border-light);
    }
    .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-light);
      font-size: 10px;
      gap: 4px;
      transition: var(--transition);
    }
    .tab-item i {
      font-size: 1.5rem;
    }
    .tab-item.active {
      color: var(--primary-deep);
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-weight: 600;
      font-size: 2.25rem;
      color: var(--primary-deep);
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, var(--primary-deep) 0%, #2D083A 100%);
      padding: 140px 0 100px;
      position: relative;
      overflow: hidden;
      color: white;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -50%;
      right: -20%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(245,166,35,0.2) 0%, transparent 70%);
      border-radius: 50%;
      filter: blur(80px);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1 1 50%;
    }
    .hero-text h1 {
      font-weight: 700;
      font-size: 3rem;
      line-height: 1.2;
      margin-bottom: 20px;
      color: white;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1 1 50%;
      background: rgba(255,255,255,0.1);
      border-radius: var(--radius-hero);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      border: 1px solid rgba(255,255,255,0.15);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    /* 优势卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      margin-top: 20px;
    }
    .feature-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: left;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }
    .data-badge {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1.1;
      margin-bottom: 16px;
    }
    .feature-title {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    /* 解决方案 */
    .solution-row {
      display: flex;
      gap: 50px;
      align-items: center;
    }
    .solution-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .solution-list {
      flex: 1;
    }
    .progress-item {
      margin-bottom: 28px;
    }
    .progress-label {
      display: flex;
      justify-content: space-between;
      font-weight: 500;
      margin-bottom: 6px;
    }
    .progress-bar {
      height: 8px;
      background: #eee;
      border-radius: 10px;
      overflow: hidden;
    }
    .progress-fill {
      height: 100%;
      background: var(--accent-gold);
      border-radius: 10px;
      width: 0%;
    }
    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scrollbar-width: thin;
      -webkit-overflow-scrolling: touch;
    }
    .case-card {
      min-width: 280px;
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-card);
      flex-shrink: 0;
    }
    .case-logo {
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 12px;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .accordion-item {
      background: var(--white);
      border-radius: 16px;
      padding: 20px 24px;
      box-shadow: var(--shadow-card);
      cursor: pointer;
    }
    .accordion-title {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #3A0A4A, #1F052E);
      color: white;
      text-align: center;
      border-radius: 40px;
      margin: 0 24px;
      padding: 80px 24px;
    }
    /* 页脚 */
    .footer {
      background: var(--primary-dark);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: rgba(255,255,255,0.7);
    }
    .footer a:hover {
      color: var(--accent-gold);
    }
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .desktop-links, .top-nav .btn-primary { display: none; }
      .hamburger { display: block; }
      .mobile-bottom-tab { display: flex; }
      section { padding: 70px 0; }
      .hero-grid { flex-direction: column; }
      .features-grid { grid-template-columns: 1fr; }
      .solution-row { flex-direction: column; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-text h1 { font-size: 2.2rem; }
    }