/* roulang page: index */
:root {
      --bg-primary: #0B0E14;
      --bg-secondary: #131820;
      --accent-cyan: #00E5FF;
      --accent-orange: #FF6B35;
      --text-primary: #EDF2F7;
      --text-secondary: #A0B4C8;
      --success: #00C897;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.06);
      --cyan-glow: 0 0 30px rgba(0, 229, 255, 0.25);
      --orange-glow: 0 0 25px rgba(255, 107, 53, 0.4);
      --border-radius-lg: 16px;
      --border-radius-md: 12px;
      --border-radius-sm: 8px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-mono: 'Inter', 'SF Pro Display', system-ui;
      --container-max: 1280px;
      --header-height: 72px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-primary);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
      font-weight: 600;
      letter-spacing: 0.5px;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border-radius: var(--border-radius-sm);
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(11, 14, 20, 0.78);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      z-index: 100;
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: baseline;
      gap: 6px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-primary);
      letter-spacing: -0.3px;
    }

    .logo-main {
      background: linear-gradient(135deg, #fff, #b0f0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .logo-sub {
      font-size: 0.8rem;
      font-weight: 500;
      color: var(--accent-cyan);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-left: 2px;
    }

    .nav-menu {
      display: flex;
      gap: 32px;
      list-style: none;
    }

    .nav-menu a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 0;
      position: relative;
      transition: color 0.2s;
    }

    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--accent-cyan);
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      box-shadow: 0 0 10px var(--accent-cyan);
      transition: width 0.25s ease;
    }

    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      width: 100%;
    }

    .header-cta {
      background: linear-gradient(135deg, #FF6B35, #FF8C5A);
      color: white;
      padding: 10px 22px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
      box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
      border: none;
    }

    .header-cta:hover {
      transform: scale(1.04);
      box-shadow: 0 0 25px rgba(255, 107, 53, 0.6);
    }

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

    .hamburger span {
      display: block;
      width: 26px;
      height: 2.5px;
      background: var(--accent-cyan);
      border-radius: 4px;
      transition: 0.2s;
    }

    /* 移动端抽屉 */
    .mobile-drawer {
      position: fixed;
      top: 0;
      right: -100%;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: rgba(11, 14, 20, 0.96);
      backdrop-filter: blur(24px);
      z-index: 200;
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 32px;
      transition: right 0.3s ease;
      border-left: 1px solid rgba(255,255,255,0.05);
    }

    .mobile-drawer.open {
      right: 0;
    }

    .drawer-close {
      align-self: flex-end;
      background: none;
      border: none;
      color: var(--text-primary);
      font-size: 2rem;
      cursor: pointer;
    }

    .drawer-menu {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .drawer-menu a {
      font-size: 1.2rem;
      color: var(--text-secondary);
      font-weight: 500;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background-color: var(--bg-primary);
      background-image: radial-gradient(circle at 30% 30%, rgba(0,229,255,0.08) 0%, transparent 40%);
      padding-top: var(--header-height);
    }

    .hero-bg {
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25;
      z-index: 0;
      filter: brightness(0.7) saturate(0.6);
    }

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

    .badge {
      display: inline-block;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 0.85rem;
      letter-spacing: 1px;
      background: rgba(0,229,255,0.05);
      margin-bottom: 24px;
    }

    .hero h1 {
      font-size: clamp(2.4rem, 5vw, 3.3rem);
      font-weight: 700;
      line-height: 1.2;
      background: linear-gradient(to right, #ffffff, #b5f0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.1rem;
      color: var(--text-secondary);
      max-width: 500px;
      margin-bottom: 36px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #00E5FF, #00B8D4);
      color: #0B0E14;
      padding: 14px 32px;
      border-radius: 30px;
      font-weight: 600;
      box-shadow: 0 0 20px rgba(0,229,255,0.4);
    }

    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0,229,255,0.7);
      transform: scale(1.03);
    }

    .btn-outline {
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 14px 32px;
      border-radius: 30px;
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(0,229,255,0.08);
    }

    /* 通用板块 */
    section {
      padding: 90px 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 16px;
      text-align: center;
      color: var(--text-primary);
    }

    .section-desc {
      color: var(--text-secondary);
      text-align: center;
      max-width: 650px;
      margin: 0 auto 50px;
    }

    /* 核心优势 不对称 */
    .features-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
      align-items: stretch;
    }

    .feature-large {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-lg);
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

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

    .feature-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-md);
      padding: 24px;
      transition: all 0.25s;
    }

    .feature-card:hover, .feature-large:hover {
      border-color: var(--accent-cyan);
      box-shadow: var(--cyan-glow);
      transform: translateY(-4px);
    }

    /* 产品服务 2x2 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-md);
      padding: 28px;
      transition: all 0.25s;
    }

    .service-card:hover {
      border-color: var(--accent-cyan);
      transform: translateY(-4px);
    }

    .service-icon {
      font-size: 2rem;
      color: var(--accent-cyan);
      margin-bottom: 16px;
    }

    .text-link {
      color: var(--accent-cyan);
      font-weight: 500;
      border-bottom: 1px dashed var(--accent-cyan);
      display: inline-block;
      margin-top: 8px;
    }

    /* 场景卡片 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .scenario-card {
      background: rgba(255,255,255,0.02);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--border-radius-md);
      overflow: hidden;
    }

    .scenario-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }

    /* 案例数据 */
    .case-row {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-bottom: 48px;
    }

    .data-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-cyan);
    }

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

    .faq-question {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }

    .faq-item.active .faq-answer {
      max-height: 150px;
      margin-top: 12px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: radial-gradient(circle at center, rgba(0,229,255,0.15) 0%, #0B0E14 70%);
      text-align: center;
      padding: 80px 24px;
    }

    .btn-orange {
      background: linear-gradient(135deg, #FF6B35, #FF8C5A);
      color: white;
      padding: 16px 36px;
      border-radius: 30px;
      box-shadow: 0 0 25px rgba(255,107,53,0.5);
    }

    /* 页脚 */
    .footer {
      background: #0B0E14;
      border-top: 1px solid rgba(255,255,255,0.06);
      padding: 50px 0 20px;
    }

    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: 1fr; }
      .scenarios-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero-content { margin-left: 5%; }
      .services-grid, .scenarios-grid { grid-template-columns: 1fr; }
      .case-row { flex-direction: column; }
    }