/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --primary-dark: #060B1F;
      --accent-red: #FF4655;
      --accent-cyan: #00E5FF;
      --bg-light: #F5F6FA;
      --card-bg: #FFFFFF;
      --border-light: #E8ECF1;
      --text-body: #5A6070;
      --text-muted: #B0B8D0;
      --text-white: #FFFFFF;
      --radius-lg: 12px;
      --radius-md: 8px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-glow: 0 8px 30px rgba(0,229,255,0.15);
      --font-mono: "SF Mono", "Menlo", "Consolas", monospace;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-light);
      color: #1E2330;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    /* 导航栏 SaaS 命令栏风格 */
    .navbar {
      background: rgba(10,14,39,0.95);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid #1A2040;
      height: 72px;
      display: flex;
      align-items: center;
      position: sticky;
      top: 0;
      z-index: 100;
      padding: 0 2rem;
    }
    .nav-logo {
      font-size: 22px;
      font-weight: 700;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }
    .nav-logo i {
      color: var(--accent-cyan);
      font-size: 24px;
    }
    .nav-links {
      display: flex;
      gap: 2.5rem;
      margin-left: 3rem;
    }
    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      transition: var(--transition);
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-cyan);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-red);
    }
    .nav-right {
      margin-left: auto;
      display: flex;
      align-items: center;
      gap: 1.2rem;
    }
    .search-box {
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 20px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      width: 200px;
      transition: var(--transition);
    }
    .search-box i {
      color: var(--text-muted);
      font-size: 14px;
    }
    .search-box input {
      background: transparent;
      border: none;
      color: #fff;
      outline: none;
      width: 100%;
      font-size: 14px;
    }
    .search-box input::placeholder {
      color: var(--text-muted);
    }
    .search-box:focus-within {
      width: 260px;
      border-color: var(--accent-cyan);
    }
    .btn-nav-cta {
      background: var(--accent-red);
      color: #fff;
      padding: 8px 20px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 14px;
      text-decoration: none;
      transition: var(--transition);
    }
    .btn-nav-cta:hover {
      background: #E63442;
      color: #fff;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      color: #fff;
      cursor: pointer;
    }
    /* Hero */
    .hero {
      background: linear-gradient(0deg, rgba(10,14,39,0.85) 0%, rgba(10,14,39,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      padding: 120px 0;
      display: flex;
      align-items: center;
      color: #fff;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 2rem;
    }
    .hero-left {
      max-width: 550px;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: #fff;
      margin-bottom: 1.5rem;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2rem;
      line-height: 1.6;
    }
    .hero-btns {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-red);
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #E63442;
      color: #fff;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-red);
      color: var(--accent-red);
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--accent-red);
      color: #fff;
    }
    .hero-cards {
      display: flex;
      gap: 0;
      position: relative;
    }
    .data-card {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(0,229,255,0.3);
      border-radius: var(--radius-lg);
      padding: 20px;
      width: 160px;
      backdrop-filter: blur(4px);
      color: #fff;
    }
    .data-card .num {
      font-family: var(--font-mono);
      font-size: 28px;
      color: var(--accent-cyan);
      font-weight: 600;
    }
    .data-card:nth-child(1) { transform: rotate(-5deg); z-index: 2; }
    .data-card:nth-child(2) { transform: rotate(0deg); margin-left: -20px; z-index: 3; }
    .data-card:nth-child(3) { transform: rotate(5deg); margin-left: -20px; z-index: 1; }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 2.5rem;
    }
    /* 优势区非对称 */
    .features-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }
    .feature-large {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .feature-large i {
      font-size: 40px;
      color: var(--accent-cyan);
      margin-bottom: 16px;
    }
    .feature-small-stack {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .feature-small {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .feature-small i {
      color: var(--accent-cyan);
      font-size: 24px;
    }
    /* 服务卡片横向滑动容器 */
    .services-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 12px;
      scroll-snap-type: x mandatory;
    }
    .service-card {
      flex: 0 0 calc(33.333% - 24px);
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      overflow: hidden;
      transition: var(--transition);
      scroll-snap-align: start;
    }
    .service-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .service-card-body {
      padding: 24px;
    }
    .text-link {
      color: var(--accent-cyan);
      text-decoration: none;
      font-weight: 500;
    }
    .text-link:hover {
      text-decoration: underline;
    }
    /* 数据深色区 */
    .dark-section {
      background: var(--primary-dark);
      color: #fff;
    }
    .data-row {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .live-list {
      flex: 1;
    }
    .live-item {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid #1A2040;
      font-family: var(--font-mono);
    }
    .live-num {
      color: var(--accent-cyan);
    }
    .chart-placeholder {
      flex: 1;
      background: rgba(0,229,255,0.05);
      border: 1px dashed var(--accent-cyan);
      border-radius: var(--radius-lg);
      height: 200px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-cyan);
    }
    .big-stat {
      font-size: 42px;
      font-weight: 700;
      color: var(--accent-red);
    }
    /* 案例瀑布流 */
    .cases-masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
    }
    .case-card img {
      width: 100%;
      height: auto;
      display: block;
    }
    .case-body {
      padding: 24px;
    }
    .case-num {
      font-size: 28px;
      font-weight: 700;
      color: var(--accent-red);
    }
    /* FAQ */
    .accordion {
      max-width: 800px;
      margin: 0 auto;
    }
    .accordion-item {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      border: 1px solid var(--border-light);
    }
    .accordion-title {
      padding: 20px 24px;
      font-weight: 500;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      align-items: center;
    }
    .accordion-content {
      padding: 0 24px 20px;
      color: var(--text-body);
      display: none;
    }
    .accordion-item.active {
      border-color: var(--accent-cyan);
    }
    .accordion-item.active .accordion-content {
      display: block;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 100%);
    }
    .cta-form {
      display: flex;
      gap: 12px;
      align-items: center;
      flex-wrap: wrap;
    }
    .cta-input {
      padding: 12px 16px;
      border-radius: var(--radius-md);
      border: 1px solid #D1D5DB;
      width: 320px;
    }
    /* 页脚 */
    .footer {
      background: var(--primary-dark);
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    .copyright {
      border-top: 1px solid #1A2040;
      text-align: center;
      padding-top: 20px;
      margin-top: 40px;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: 1fr; }
      .services-scroll .service-card { flex: 0 0 calc(50% - 24px); }
      .cases-masonry { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 640px) {
      .nav-links, .search-box { display: none; }
      .hamburger { display: block; }
      .hero-grid { flex-direction: column; }
      .hero h1 { font-size: 32px; }
      .hero-cards { margin-top: 2rem; }
      .services-scroll .service-card { flex: 0 0 85%; }
      .cases-masonry { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .data-row { flex-direction: column; }
    }