/* roulang page: index */
:root {
      --primary-deep: #0A0F1E;
      --accent-green: #00E5A0;
      --accent-coral: #FF5C72;
      --bg-light: #F4F6FA;
      --bg-white: #FFFFFF;
      --bg-dark-card: rgba(20, 27, 45, 0.7);
      --text-main: #1A1F2E;
      --text-muted: #5A6072;
      --text-on-dark: #FFFFFF;
      --border-light: rgba(255, 255, 255, 0.8);
      --border-green: rgba(0, 229, 160, 0.15);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-glass: 0 8px 32px rgba(10,15,30,0.08);
      --shadow-hover: 0 16px 40px rgba(0,0,0,0.1);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Text", sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航分屏联动 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(10, 15, 30, 0.85);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      z-index: 100;
      display: flex;
      align-items: center;
    }

    .nav-inner {
      display: flex;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      align-items: center;
      justify-content: space-between;
    }

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

    .logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--accent-green);
      text-decoration: none;
      letter-spacing: -0.3px;
    }

    .nav-links {
      display: flex;
      gap: 28px;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-on-dark);
      text-decoration: none;
      transition: color 0.2s;
      position: relative;
    }

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

    .nav-right {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .btn-primary-sm {
      background: var(--accent-green);
      color: var(--primary-deep);
      border: none;
      padding: 8px 20px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      letter-spacing: 0.3px;
      box-shadow: 0 0 14px rgba(0,229,160,0.4);
      transition: all 0.25s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-primary-sm:hover {
      box-shadow: 0 0 22px rgba(0,229,160,0.7);
      transform: translateY(-2px);
    }

    .search-icon {
      color: white;
      font-size: 18px;
      opacity: 0.8;
      cursor: pointer;
      background: none;
      border: none;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 24px;
      cursor: pointer;
    }

    @media (max-width: 768px) {
      .nav-links, .nav-right .btn-primary-sm, .search-icon {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .nav-inner {
        justify-content: space-between;
      }
    }

    .mobile-menu {
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      height: calc(100vh - 64px);
      background: #0A0F1E;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
      transform: translateX(100%);
      transition: transform 0.3s ease;
      z-index: 99;
    }

    .mobile-menu.open {
      transform: translateX(0);
    }

    .mobile-menu a {
      color: white;
      font-size: 20px;
      text-decoration: none;
      font-weight: 500;
    }

    /* Hero */
    .hero {
      background: var(--primary-deep);
      display: flex;
      align-items: center;
      min-height: 100vh;
      padding-top: 64px;
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: flex;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      align-items: center;
    }

    .hero-left {
      flex: 0 0 55%;
      z-index: 2;
      padding-right: 40px;
    }

    .hero-right {
      flex: 0 0 45%;
      position: relative;
      height: 500px;
    }

    .hero h1 {
      font-size: 48px;
      line-height: 56px;
      font-weight: 700;
      color: white;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      line-height: 28px;
      color: #B0B8C9;
      margin-bottom: 32px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent-green);
      color: var(--primary-deep);
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      box-shadow: 0 0 18px rgba(0,229,160,0.5);
      transition: 0.25s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(0,229,160,0.8);
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid var(--accent-green);
      color: var(--accent-green);
      padding: 14px 32px;
      border-radius: var(--sm);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: 0.25s;
      text-decoration: none;
    }

    .btn-secondary:hover {
      background: rgba(0,229,160,0.08);
    }

    .particles {
      position: absolute;
      right: 0;
      top: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 20% 30%, rgba(0,229,160,0.15) 0%, transparent 50%),
                  radial-gradient(circle at 80% 70%, rgba(255,92,114,0.1) 0%, transparent 40%);
      pointer-events: none;
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-left {
        flex: auto;
        padding-right: 0;
        text-align: left;
        margin-bottom: 30px;
      }
      .hero-right {
        flex: auto;
        height: 300px;
        width: 100%;
      }
      .hero h1 {
        font-size: 36px;
        line-height: 44px;
      }
    }

    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    h2 {
      font-size: 36px;
      font-weight: 600;
      line-height: 44px;
      margin-bottom: 16px;
    }

    .section-head {
      text-align: center;
      margin-bottom: 48px;
    }

    /* 核心优势非对称 */
    .features-grid {
      display: flex;
      gap: 24px;
    }

    .feature-large {
      flex: 0 0 50%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-md);
      padding: 40px;
      color: white;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      min-height: 360px;
      position: relative;
      overflow: hidden;
    }

    .feature-large::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10,15,30,0.65);
    }

    .feature-large h3, .feature-large p {
      position: relative;
      z-index: 1;
    }

    .feature-small-group {
      flex: 0 0 50%;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .feature-small {
      background: white;
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-card);
      flex: 1;
    }

    .icon-glow {
      font-size: 32px;
      color: var(--accent-green);
      margin-bottom: 12px;
    }

    @media (max-width: 768px) {
      .features-grid {
        flex-direction: column;
      }
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: rgba(255,255,255,0.6);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.8);
      box-shadow: var(--shadow-glass);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: all 0.3s;
    }

    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      backdrop-filter: blur(16px);
    }

    .capabilities-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .progress-bar {
      height: 2px;
      background: #E8EBF0;
      margin-top: 16px;
      width: 40%;
      transition: width 0.3s;
      background: var(--accent-green);
    }

    .glass-card:hover .progress-bar {
      width: 70%;
    }

    @media (max-width: 992px) {
      .capabilities-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 576px) {
      .capabilities-grid {
        grid-template-columns: 1fr;
      }
    }

    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-img {
      flex: 1;
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .scenario-img img {
      width: 100%;
      height: auto;
      display: block;
    }
    .scenario-text {
      flex: 1;
    }

    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .case-img img {
      width: 100%;
      height: 160px;
      object-fit: cover;
    }
    .case-content {
      padding: 20px;
    }
    .metric {
      font-size: 32px;
      font-weight: 700;
      color: var(--accent-coral);
      font-family: var(--font-number);
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
    }
    .pricing-card.featured {
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(14px);
      border: 1px solid var(--accent-green);
      transform: translateY(-12px);
      box-shadow: 0 20px 32px rgba(0,229,160,0.15);
    }
    .price {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary-deep);
    }

    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px 32px;
    }
    .faq-item {
      border-bottom: 1px solid #E8EBF0;
      padding: 16px 0;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
    }

    .cta-banner {
      background: #141B2D;
      text-align: center;
      padding: 80px 20px;
    }

    footer {
      background: #0A0F1E;
      color: #B0B8C9;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .faq-grid {
        grid-template-columns: 1fr;
      }
      .pricing-grid {
        grid-template-columns: 1fr;
      }
      .cases-grid {
        grid-template-columns: 1fr;
      }
      .scenario-row, .scenario-row.reverse {
        flex-direction: column;
      }
    }