/* roulang page: index */
:root {
      --bg-deep: #0A0F14;
      --bg-dark: #0D1B22;
      --primary-deep: #0A2E2F;
      --accent-cyan: #00C9B6;
      --accent-cyan-dark: #009B8C;
      --accent-orange: #FF6A3D;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.06);
      --text-primary: #F0F4F5;
      --text-secondary: #B0C4C7;
      --text-muted: #6A7E82;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.6);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-btn: 50px;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', system-ui, -apple-system, sans-serif;
      background: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航系统 */
    .nav-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s, backdrop-filter 0.3s;
      background: transparent;
      padding: 16px 0;
    }

    .nav-header.scrolled {
      background: rgba(10, 15, 20, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      letter-spacing: 1px;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--accent-cyan);
      font-size: 2rem;
    }
    .logo span {
      background: linear-gradient(135deg, #fff 0%, #ccf0f0 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: #d0e0e3;
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      letter-spacing: 0.3px;
    }
    .nav-links a:hover {
      color: var(--accent-cyan);
    }
    .nav-cta {
      background: var(--accent-cyan);
      color: #0A0F14 !important;
      padding: 10px 24px;
      border-radius: 50px;
      font-weight: 600;
      margin-left: 8px;
      box-shadow: 0 0 12px rgba(0, 201, 182, 0.4);
      transition: all 0.3s;
    }
    .nav-cta:hover {
      background: #00e0cc;
      box-shadow: 0 0 20px rgba(0, 201, 182, 0.7);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* 底部移动导航 */
    .mobile-bottom-nav {
      display: none;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A0F14 0%, #0D1B22 70%, #0A2E2F 100%);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 48px;
      flex-wrap: wrap;
      width: 100%;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero-text h1 {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
      background: linear-gradient(to right, #fff, #b0f0e8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: #cbd5d9;
      margin-bottom: 36px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00C9B6, #009B8C);
      border: none;
      padding: 14px 36px;
      border-radius: 50px;
      color: #0A0F14;
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      box-shadow: 0 0 20px rgba(0, 201, 182, 0.5);
      transition: all 0.3s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0, 201, 182, 0.8);
      transform: translateY(-2px);
      background: #00e0cc;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      padding: 14px 36px;
      border-radius: 50px;
      color: var(--accent-cyan);
      font-weight: 600;
      cursor: pointer;
      transition: 0.3s;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(0, 201, 182, 0.1);
    }
    .hero-stats {
      flex: 0 0 280px;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: 24px;
      padding: 28px;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .stat-item h3 {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-orange);
    }
    .stat-item p {
      color: #b0c4c7;
      font-size: 0.9rem;
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: #fff;
    }
    .section-sub {
      color: #9aadaf;
      margin-bottom: 48px;
    }

    /* 优势区 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      transition: var(--transition);
    }
    .adv-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0, 201, 182, 0.3);
    }
    .adv-icon {
      font-size: 2.2rem;
      color: var(--accent-cyan);
      margin-bottom: 20px;
    }

    /* 产品矩阵 错落网格 */
    .product-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 24px;
    }
    .product-subgrid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .product-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: var(--transition);
    }
    .product-card.large {
      grid-row: span 2;
    }
    .product-card:hover {
      border-color: rgba(0, 201, 182, 0.4);
      box-shadow: 0 0 28px rgba(0, 201, 182, 0.15);
    }
    .tag {
      display: inline-block;
      background: rgba(0, 201, 182, 0.15);
      color: var(--accent-cyan);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      margin-bottom: 16px;
    }

    /* 场景 */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .scene-img {
      flex: 1;
      height: 320px;
      border-radius: 24px;
      background-size: cover;
      background-position: center;
    }

    /* 案例卡片 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
    }
    .case-card {
      min-width: 260px;
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-md);
      padding: 20px;
      border: 1px solid var(--glass-border);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 700;
      font-size: 1.1rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    /* CTA */
    .cta-section {
      background: #0A0F14;
      text-align: center;
      padding: 80px 0;
    }

    footer {
      background: #080D12;
      padding: 60px 0 30px;
      color: #8a9ba0;
    }

    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: repeat(2,1fr); }
      .product-grid { grid-template-columns: 1fr; }
      .hero-content { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        width: 100%;
        background: rgba(8,13,18,0.9);
        backdrop-filter: blur(20px);
        justify-content: space-around;
        padding: 12px;
        z-index: 999;
      }
      section { padding: 60px 0; }
      .hero-text h1 { font-size: 2.2rem; }
    }