/* roulang page: index */
:root {
      --primary: #0A1128;
      --secondary: #00F0A8;
      --accent: #F5A623;
      --surface-glass: rgba(10, 17, 40, 0.65);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.7);
      --text-dark: #E0E6F0;
      --border-light: rgba(255, 255, 255, 0.08);
      --border-card: rgba(255, 255, 255, 0.12);
      --glow: 0 0 18px rgba(0, 240, 168, 0.5);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-input: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
      --font-number: 'DIN Alternate', 'Inter', 'PingFang SC', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--primary);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    /* 导航 */
    .gg-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: 72px;
      background: rgba(10, 17, 40, 0.4);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      transition: background 0.3s ease, border-color 0.3s ease;
      display: flex;
      align-items: center;
    }

    .gg-nav.scrolled {
      background: rgba(10, 17, 40, 0.92);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 22px;
      color: #FFFFFF;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--secondary);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 700;
      font-size: 18px;
    }

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

    .nav-links a {
      font-size: 15px;
      color: rgba(255, 255, 255, 0.8);
      font-weight: 500;
      position: relative;
      padding-bottom: 4px;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: var(--secondary);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--secondary);
      color: var(--primary);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-size: 15px;
      box-shadow: 0 0 20px rgba(0, 240, 168, 0.5);
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      white-space: nowrap;
    }

    .nav-cta:hover {
      background: #33FFBB;
      box-shadow: 0 0 30px rgba(0, 240, 168, 0.8);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }

    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(10, 17, 40, 0.96);
        backdrop-filter: blur(18px);
        flex-direction: column;
        padding: 32px 24px;
        gap: 24px;
        border-bottom: 1px solid rgba(255,255,255,0.1);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .nav-cta.desktop-only {
        display: none;
      }
      .nav-container {
        justify-content: space-between;
      }
    }

    @media (min-width: 769px) {
      .hamburger {
        display: none;
      }
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 650px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: flex-start;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(to top, #0A1128 0%, rgba(10,17,40,0.7) 60%, rgba(10,17,40,0.3) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      width: 100%;
      margin-left: 8%;
      padding: 0 24px;
    }

    .hero h1 {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 48px;
      line-height: 1.2;
      margin-bottom: 24px;
      color: white;
      border-left: 5px solid var(--secondary);
      padding-left: 24px;
    }

    .hero-sub {
      font-size: 20px;
      color: rgba(255, 255, 255, 0.8);
      max-width: 560px;
      margin-bottom: 40px;
      line-height: 1.7;
    }

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

    .btn-primary {
      background: var(--secondary);
      color: var(--primary);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 16px;
      box-shadow: 0 0 20px rgba(0,240,168,0.6), 0 4px 12px rgba(0,0,0,0.3);
      transition: all 0.25s ease;
      cursor: pointer;
      display: inline-block;
    }

    .btn-primary:hover {
      background: #33FFBB;
      box-shadow: 0 0 30px rgba(0,240,168,0.8);
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--secondary);
      color: var(--secondary);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 16px;
      transition: all 0.25s ease;
      cursor: pointer;
    }

    .btn-secondary:hover {
      background: rgba(0,240,168,0.1);
    }

    @media (max-width: 768px) {
      .hero {
        justify-content: center;
        text-align: center;
      }
      .hero-content {
        margin-left: 0;
        display: flex;
        flex-direction: column;
        align-items: center;
      }
      .hero h1 {
        font-size: 32px;
        border-left: none;
        padding-left: 0;
        border-bottom: 3px solid var(--secondary);
        padding-bottom: 16px;
      }
      .hero-buttons {
        justify-content: center;
      }
    }

    /* 板块通用 */
    section {
      padding: 120px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }

    .section-title {
      font-family: var(--font-heading);
      font-weight: 600;
      font-size: 36px;
      margin-bottom: 16px;
      color: white;
      text-align: center;
    }

    .section-desc {
      color: var(--text-secondary);
      text-align: center;
      max-width: 680px;
      margin: 0 auto 48px;
      font-size: 18px;
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .glass-card {
      background: var(--surface-glass);
      backdrop-filter: blur(18px) saturate(120%);
      -webkit-backdrop-filter: blur(18px) saturate(120%);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .glass-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 12px 40px rgba(0,240,168,0.15);
      border-color: rgba(0,240,168,0.2);
    }

    .feature-icon {
      font-size: 48px;
      margin-bottom: 24px;
      color: var(--secondary);
    }

    .card-title {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .card-text {
      color: var(--text-secondary);
      font-size: 16px;
    }

    @media (max-width: 1024px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 640px) {
      .grid-3 {
        grid-template-columns: 1fr;
      }
    }

    /* 场景 */
    .scenario-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      margin-bottom: 60px;
    }

    .scenario-img {
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.1);
    }

    @media (max-width: 768px) {
      .scenario-row {
        grid-template-columns: 1fr;
      }
      .scenario-img {
        order: -1;
      }
    }

    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
      scrollbar-color: var(--secondary) var(--primary);
    }

    .case-card {
      min-width: 280px;
      background: var(--surface-glass);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-card);
      padding: 24px;
      border: 1px solid var(--border-light);
    }

    .case-number {
      font-family: var(--font-number);
      font-size: 42px;
      font-weight: 700;
      color: var(--accent);
    }

    /* 价格卡 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .pricing-card {
      background: var(--surface-glass);
      border-radius: var(--radius-card);
      padding: 40px 24px;
      border: 1px solid var(--border-card);
      text-align: center;
      transition: all 0.3s;
      position: relative;
    }

    .pricing-card.featured {
      border-color: var(--secondary);
      box-shadow: 0 0 24px rgba(0,240,168,0.5);
      transform: translateY(-8px);
    }

    .price {
      font-size: 40px;
      font-weight: 700;
      color: var(--secondary);
      margin: 16px 0;
    }

    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
      .pricing-card.featured {
        transform: none;
      }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 500;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-secondary);
      padding-right: 30px;
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }

    /* CTA 尾屏 */
    .cta-dark {
      background: #080E1F;
      text-align: center;
      padding: 100px 24px;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding: 24px 0;
      text-align: center;
      color: rgba(255,255,255,0.4);
      font-size: 13px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    button, .btn-primary, .btn-secondary {
      min-height: 44px;
    }