/* roulang page: index */
:root {
      --primary-lime: #A3E635;
      --primary-lime-hover: #BEF264;
      --deep-black: #0B0F19;
      --dark-surface: #111827;
      --card-bg: #F5F5F7;
      --warm-gray: #9CA3AF;
      --text-main: #1F2937;
      --text-secondary: #6B7280;
      --border-light: rgba(0, 0, 0, 0.04);
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-large: 20px;
      --transition: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-mono: "Inter", "SF Pro Display", system-ui, sans-serif;
      --container-max: 1280px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: #0B0F19;
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      font-weight: 600;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.02);
      transition: box-shadow 0.3s ease, background 0.3s;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      color: #0B0F19;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      font-size: 1.8rem;
      color: var(--primary-lime);
      filter: drop-shadow(0 0 6px rgba(163,230,53,0.4));
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-weight: 500;
      color: #1F2937;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary-lime);
    }
    .btn-primary {
      background: var(--primary-lime);
      color: #0B0F19;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(163,230,53,0.25);
    }
    .btn-primary:hover {
      background: var(--primary-lime-hover);
      transform: scale(1.03);
      box-shadow: 0 8px 18px rgba(163,230,53,0.35);
    }
    .btn-outline {
      border: 1.5px solid var(--primary-lime);
      color: var(--primary-lime);
      background: transparent;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(163,230,53,0.08);
      border-color: var(--primary-lime-hover);
      color: var(--primary-lime-hover);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 25px;
      height: 2.5px;
      background: #0B0F19;
      border-radius: 4px;
      transition: 0.2s;
    }
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(11,15,25,0.97);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 36px;
        z-index: 999;
      }
      .nav-menu.active {
        display: flex;
      }
      .nav-link {
        color: white;
        font-size: 1.5rem;
        font-weight: 500;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
        position: relative;
      }
      .header-cta-desktop {
        display: none;
      }
    }
    @media (min-width: 769px) {
      .header-cta-mobile {
        display: none;
      }
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: radial-gradient(circle at 30% 30%, #1a2335 0%, #0B0F19 90%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-title {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
    }
    .hero-highlight {
      color: var(--primary-lime);
      font-weight: 700;
    }
    .hero-desc {
      font-size: 1.1rem;
      color: var(--warm-gray);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      align-items: center;
      flex-wrap: wrap;
    }
    .hero-stats {
      display: flex;
      gap: 32px;
      margin-top: 36px;
    }
    .stat-item h3 {
      font-family: var(--font-mono);
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary-lime);
      line-height: 1.2;
    }
    .stat-item span {
      font-size: 0.85rem;
      color: #9CA3AF;
      display: block;
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      height: 380px;
      width: 100%;
      box-shadow: 0 25px 40px -15px rgba(0,0,0,0.6);
      position: relative;
      overflow: hidden;
      border: 1px solid rgba(163,230,53,0.15);
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-title {
        font-size: 34px;
      }
      .hero-visual {
        height: 280px;
      }
    }
    /* 区块通用 */
    .section {
      padding: 80px 0;
    }
    .section-dark {
      background: #0B0F19;
    }
    .section-light {
      background: #F5F5F7;
    }
    .section-title {
      font-size: 30px;
      font-weight: 600;
      margin-bottom: 16px;
      color: #111827;
    }
    .section-dark .section-title {
      color: white;
    }
    .section-sub {
      color: #6B7280;
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .dash-card {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(163,230,53,0.15);
      border-radius: var(--radius-large);
      padding: 28px;
      text-align: center;
      transition: 0.3s;
    }
    .dash-card:hover {
      border-color: var(--primary-lime);
      box-shadow: 0 0 18px rgba(163,230,53,0.2);
    }
    .dash-number {
      font-family: var(--font-mono);
      font-size: 44px;
      font-weight: 700;
      color: var(--primary-lime);
    }
    .dash-label {
      color: #9CA3AF;
      font-size: 0.9rem;
      margin-top: 8px;
    }
    @media (max-width: 768px) {
      .dashboard-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    /* 服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      border: 1px solid transparent;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-lime);
    }
    .card-icon {
      font-size: 2.4rem;
      color: var(--primary-lime);
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-weight: 600;
      font-size: 1.3rem;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .cards-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      background: white;
      border-radius: 28px;
      padding: 32px;
    }
    .compare-col h4 {
      font-size: 1.5rem;
      margin-bottom: 24px;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 14px 0;
      border-bottom: 1px solid #f0f0f0;
    }
    .icon-check {
      color: #A3E635;
      font-weight: bold;
    }
    .icon-cross {
      color: #F87171;
    }
    @media (max-width: 640px) {
      .compare-table {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 16px;
      margin-bottom: 16px;
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: #F9FAFB;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: white;
      padding: 0 24px;
    }
    .faq-answer p {
      padding: 16px 0;
      color: #4B5563;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    /* CTA */
    .cta-band {
      background: #0B0F19;
      text-align: center;
      padding: 80px 24px;
    }
    .cta-form {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    .cta-input {
      padding: 14px 20px;
      border-radius: 12px;
      border: 1px solid #D1D5DB;
      background: white;
      min-width: 240px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      color: #9CA3AF;
      font-size: 0.9rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }