/* roulang page: index */
:root {
      --bg-base: #070b19;
      --bg-alt: #0d1527;
      --bg-elevated: #131f38;
      --glass-bg: rgba(16, 26, 48, 0.72);
      --glass-border: rgba(0, 240, 255, 0.16);
      --glass-hover-border: rgba(0, 240, 255, 0.45);
      --cyan-glow: #00f0ff;
      --sport-blue: #0066ff;
      --neon-green: #00ff9d;
      --energy-amber: #ff9900;
      --text-pure: #ffffff;
      --text-sub: #a4b3c6;
      --text-muted: #5f7595;
      --card-radius: 14px;
      --pill-radius: 999px;
      --shadow-deep: 0 12px 40px rgba(0, 0, 0, 0.45);
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body {
      background-color: var(--bg-base);
      color: var(--text-pure);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a { color: inherit; text-decoration: none; transition: all 0.3s ease; }
    a:hover { color: var(--cyan-glow); }
    img { max-width: 100%; height: auto; display: block; }
    ul { list-style: none; margin: 0; padding: 0; }

    /* 顶部双行导航 */
    .top-utility-bar {
      background: rgba(7, 11, 25, 0.95);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.8125rem;
      padding: 6px 0;
      color: var(--text-muted);
    }
    .node-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-right: 18px;
    }
    .node-dot {
      width: 7px;
      height: 7px;
      background: var(--neon-green);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--neon-green);
    }
    .main-nav-wrapper {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(13, 21, 39, 0.85);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid var(--glass-border);
      padding: 14px 0;
    }
    .nav-brand {
      font-size: 1.45rem;
      font-weight: 800;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--text-pure);
    }
    .brand-icon {
      color: var(--cyan-glow);
      font-size: 1.5rem;
      filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.5));
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 22px;
      margin: 0;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-sub);
      position: relative;
      padding: 6px 2px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--cyan-glow);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--cyan-glow);
      box-shadow: 0 0 8px var(--cyan-glow);
    }

    /* 按钮与UI组件 */
    .btn-glow {
      background: linear-gradient(135deg, var(--cyan-glow) 0%, var(--sport-blue) 100%);
      color: #030814 !important;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--pill-radius);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: none;
      cursor: pointer;
      box-shadow: 0 0 16px rgba(0, 240, 255, 0.35);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .btn-glow:hover {
      box-shadow: 0 0 26px rgba(0, 240, 255, 0.7);
      transform: translateY(-2px);
      color: #000000 !important;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--cyan-glow);
      color: var(--cyan-glow);
      padding: 10px 22px;
      border-radius: var(--pill-radius);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.12);
      border-color: #ffffff;
      color: #ffffff;
    }
    .tag-pill {
      display: inline-block;
      font-size: 0.75rem;
      padding: 4px 12px;
      border-radius: var(--pill-radius);
      background: rgba(0, 240, 255, 0.1);
      border: 1px solid rgba(0, 240, 255, 0.3);
      color: var(--cyan-glow);
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 12px;
    }

    /* 统一卡片与板块 */
    .section-spacing {
      padding: 90px 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--bg-alt);
    }
    .section-header {
      margin-bottom: 54px;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-pure);
      margin-bottom: 14px;
    }
    .section-intro {
      font-size: 1.05rem;
      color: var(--text-sub);
      line-height: 1.75;
      max-width: 820px;
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      padding: 28px;
      transition: all 0.35s ease;
      height: 100%;
      box-shadow: var(--shadow-deep);
    }
    .glass-card:hover {
      border-color: var(--glass-hover-border);
      transform: translateY(-5px);
      box-shadow: 0 16px 48px rgba(0, 240, 255, 0.12);
    }

    /* 首屏 Hero */
    .hero-section {
      min-height: 85vh;
      position: relative;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 75% 20%, rgba(0, 102, 255, 0.28) 0%, transparent 60%),
                  radial-gradient(circle at 10% 80%, rgba(0, 240, 255, 0.18) 0%, transparent 55%),
                  linear-gradient(180deg, #070b19 0%, #0d1527 100%);
      padding: 70px 0;
      border-bottom: 1px solid rgba(0, 240, 255, 0.1);
    }
    .hero-h1 {
      font-size: 3.1rem;
      font-weight: 900;
      line-height: 1.22;
      margin-bottom: 22px;
      background: linear-gradient(180deg, #ffffff 30%, #a8cfff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.125rem;
      color: var(--text-sub);
      line-height: 1.8;
      margin-bottom: 34px;
    }
    .hero-stage-card {
      background: rgba(19, 31, 56, 0.7);
      border: 1px solid rgba(0, 240, 255, 0.3);
      border-radius: var(--card-radius);
      padding: 24px;
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
      position: relative;
      overflow: hidden;
    }
    .hero-stage-card img {
      border-radius: 8px;
      width: 100%;
      object-fit: cover;
      max-height: 380px;
      filter: saturate(1.1) contrast(1.05);
    }
    .hero-overlay-tag {
      position: absolute;
      top: 36px;
      right: 36px;
      background: rgba(7, 11, 25, 0.85);
      border: 1px solid var(--cyan-glow);
      padding: 8px 14px;
      border-radius: 8px;
      font-size: 0.8rem;
      font-family: monospace;
      color: var(--cyan-glow);
    }

    /* 矩阵与六宫格 */
    .matrix-icon-box {
      width: 52px;
      height: 52px;
      background: rgba(0, 240, 255, 0.1);
      border: 1px solid rgba(0, 240, 255, 0.3);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--cyan-glow);
      font-size: 1.4rem;
      margin-bottom: 18px;
    }

    /* 实施时间轴 Workflow */
    .timeline-node {
      position: relative;
      padding-left: 28px;
      border-left: 2px dashed rgba(0, 240, 255, 0.35);
      margin-bottom: 36px;
    }
    .timeline-node::before {
      content: '';
      position: absolute;
      left: -9px;
      top: 4px;
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background: var(--bg-base);
      border: 3px solid var(--cyan-glow);
      box-shadow: 0 0 10px var(--cyan-glow);
    }

    /* 数据指标条 Stats */
    .stats-strip {
      background: linear-gradient(90deg, #091329 0%, #0d1e3d 50%, #091329 100%);
      border-top: 1px solid var(--glass-border);
      border-bottom: 1px solid var(--glass-border);
      padding: 50px 0;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 900;
      font-family: "Courier New", Courier, monospace;
      color: var(--cyan-glow);
      text-shadow: 0 0 18px rgba(0, 240, 255, 0.6);
      line-height: 1.1;
      margin-bottom: 6px;
    }

    /* 产品规格矩阵对比卡 */
    .tier-featured {
      border: 2px solid var(--cyan-glow) !important;
      transform: scale(1.02);
      box-shadow: 0 0 35px rgba(0, 240, 255, 0.25);
    }

    /* FAQ 手风琴样式 */
    .faq-item {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: 10px;
      margin-bottom: 14px;
      overflow: hidden;
      transition: all 0.3s;
    }
    .faq-title {
      padding: 18px 24px;
      font-size: 1.1rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-pure);
    }
    .faq-title:hover {
      background: rgba(0, 240, 255, 0.05);
      color: var(--cyan-glow);
    }
    .faq-body {
      padding: 0 24px 20px;
      color: var(--text-sub);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    /* 表单组件 */
    .custom-input {
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(0, 240, 255, 0.2);
      color: #fff;
      border-radius: 8px;
      padding: 12px 16px;
      font-size: 0.95rem;
      width: 100%;
      outline: none;
      margin-bottom: 14px;
      transition: border-color 0.3s;
    }
    .custom-input:focus {
      border-color: var(--cyan-glow);
      background: rgba(255, 255, 255, 0.1);
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
    }

    /* 页脚 */
    .site-footer {
      background: #040710;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding: 70px 0 30px;
      color: var(--text-muted);
      font-size: 0.875rem;
    }
    .footer-heading {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    /* 移动端汉堡菜单支持 */
    .menu-toggle {
      display: none;
      font-size: 1.5rem;
      color: var(--cyan-glow);
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .hero-h1 { font-size: 2.3rem; }
      .tier-featured { transform: scale(1); }
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        background: var(--bg-alt);
        position: absolute;
        top: 100%;
        left: 0;
        padding: 20px 24px;
        border-bottom: 1px solid var(--glass-border);
      }
      .nav-links.is-open { display: flex; }
      .nav-links a { width: 100%; padding: 10px 0; }
    }
    @media (max-width: 640px) {
      .hero-h1 { font-size: 1.85rem; }
      .section-title { font-size: 1.7rem; }
      .section-spacing { padding: 60px 0; }
      .top-utility-bar { display: none; }
    }