/* roulang page: index */
:root {
      --bg-dark: #0B0E14;
      --bg-alt: #121824;
      --bg-card: #161F30;
      --neon-green: #00FF87;
      --neon-cyan: #60EFFF;
      --text-main: #F4F7FB;
      --text-muted: rgba(244, 247, 251, 0.68);
      --border-line: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 255, 135, 0.28);
      --glow-shadow: 0 8px 32px rgba(0, 255, 135, 0.16);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      padding: 0;
      font-family: var(--font-stack);
      background-color: var(--bg-dark);
      color: var(--text-main);
      line-height: 1.75;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a { color: inherit; text-decoration: none; transition: all 0.25s ease; }
    a:hover, a:focus { color: var(--neon-cyan); }
    img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }

    /* 容器基座 */
    .site-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.25rem;
    }

    /* 顶层状态栏 */
    .top-status-bar {
      background: #080A0F;
      border-bottom: 1px solid var(--border-line);
      font-size: 0.8125rem;
      color: var(--text-muted);
      padding: 0.4rem 0;
    }
    .top-status-bar .bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 0.5rem;
    }
    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
    }
    .status-dot {
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: var(--neon-green);
      box-shadow: 0 0 8px var(--neon-green);
    }

    /* 主导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(11, 14, 20, 0.94);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-line);
    }
    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 0.6rem;
      font-size: 1.35rem;
      font-weight: 800;
      letter-spacing: 0.5px;
      color: #FFFFFF;
    }
    .brand-logo .tech-mark {
      color: var(--neon-green);
      background: linear-gradient(135deg, var(--neon-cyan), var(--neon-green));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .nav-links {
      display: flex;
      list-style: none;
      margin: 0;
      padding: 0;
      gap: 1.75rem;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.9375rem;
      color: var(--text-muted);
      position: relative;
      padding: 0.4rem 0;
      font-weight: 500;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: #FFFFFF;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: linear-gradient(90deg, var(--neon-cyan), var(--neon-green));
      box-shadow: 0 0 8px var(--neon-green);
      transition: width 0.3s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    /* 按钮规范 */
    .neon-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9375rem;
      padding: 0.65rem 1.4rem;
      border-radius: var(--radius-sm);
      border: 1px solid var(--neon-green);
      background: linear-gradient(135deg, rgba(0, 255, 135, 0.12), rgba(96, 239, 255, 0.12));
      color: var(--neon-green);
      box-shadow: 0 0 14px rgba(0, 255, 135, 0.2);
      cursor: pointer;
      white-space: nowrap;
      transition: all 0.25s ease;
    }
    .neon-btn:hover {
      background: linear-gradient(135deg, var(--neon-cyan), var(--neon-green));
      color: #070B11;
      box-shadow: 0 0 24px rgba(0, 255, 135, 0.6);
      transform: translateY(-2px);
    }
    .ghost-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 0.9375rem;
      padding: 0.65rem 1.4rem;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-line);
      background: rgba(255, 255, 255, 0.04);
      color: var(--text-main);
      cursor: pointer;
      white-space: nowrap;
    }
    .ghost-btn:hover {
      background: rgba(255, 255, 255, 0.09);
      border-color: rgba(255, 255, 255, 0.25);
      color: #FFF;
    }

    /* 板块共有规范 */
    .content-section {
      padding: 5.5rem 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--bg-alt);
    }
    .section-header {
      margin-bottom: 3.25rem;
      text-align: left;
    }
    .section-kicker {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 700;
      letter-spacing: 1.2px;
      text-transform: uppercase;
      color: var(--neon-green);
      margin-bottom: 0.6rem;
    }
    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: #FFFFFF;
      margin: 0 0 0.85rem 0;
      letter-spacing: -0.5px;
    }
    .section-lead {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0;
    }

    /* 霓虹暗色卡片 */
    .glow-card {
      background: var(--bg-card);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 1.85rem;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
      height: 100%;
    }
    .glow-card:hover {
      transform: translateY(-4px);
      border-color: var(--border-glow);
      box-shadow: var(--glow-shadow);
    }

    /* 板块 1: Hero 首屏促销主视觉 */
    .hero-banner {
      position: relative;
      background: linear-gradient(180deg, rgba(11, 14, 20, 0.72) 0%, rgba(11, 14, 20, 0.95) 100%),
                  url('/assets/images/7f40e3cc32d83f80.webp') center/cover no-repeat;
      padding: 6.5rem 0 5.5rem;
      border-bottom: 1px solid var(--border-line);
      overflow: hidden;
    }
    .hero-badge-tag {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      background: rgba(0, 255, 135, 0.12);
      border: 1px solid rgba(0, 255, 135, 0.35);
      border-radius: 999px;
      padding: 0.35rem 0.95rem;
      font-size: 0.85rem;
      color: var(--neon-green);
      margin-bottom: 1.5rem;
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 900;
      line-height: 1.22;
      letter-spacing: -1px;
      color: #FFFFFF;
      margin-bottom: 1.4rem;
    }
    .hero-title span {
      background: linear-gradient(135deg, #FFFFFF 30%, var(--neon-cyan) 75%, var(--neon-green) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead-text {
      font-size: 1.125rem;
      color: var(--text-muted);
      margin-bottom: 2.2rem;
      max-width: 680px;
    }
    .hero-cta-group {
      display: flex;
      gap: 1.1rem;
      align-items: center;
      flex-wrap: wrap;
      margin-bottom: 2.5rem;
    }
    .hero-proof-chips {
      display: flex;
      gap: 2rem;
      border-top: 1px solid var(--border-line);
      padding-top: 1.6rem;
      flex-wrap: wrap;
    }
    .hero-proof-item h4 {
      font-size: 1.6rem;
      color: var(--neon-green);
      margin: 0;
      font-weight: 800;
      font-family: monospace;
    }
    .hero-proof-item p {
      margin: 0;
      font-size: 0.8125rem;
      color: var(--text-muted);
    }
    .hero-visual-card {
      border: 1px solid var(--border-line);
      border-radius: var(--radius-lg);
      background: rgba(22, 31, 48, 0.85);
      padding: 1.5rem;
      box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
      backdrop-filter: blur(10px);
    }

    /* 板块 2: 能力概览 */
    .feature-tag {
      font-size: 0.75rem;
      padding: 0.2rem 0.55rem;
      border-radius: var(--radius-sm);
      background: rgba(96, 239, 255, 0.12);
      color: var(--neon-cyan);
      display: inline-block;
      margin-bottom: 0.75rem;
    }

    /* 板块 5: 架构与技术底座 */
    .engine-spec-list {
      display: flex;
      flex-direction: column;
      gap: 1.25rem;
    }
    .engine-spec-box {
      border-left: 3px solid var(--neon-cyan);
      padding-left: 1.2rem;
      background: rgba(255,255,255,0.02);
      padding: 1rem 1.2rem;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    }

    /* 板块 7: 关键运营数据统计条 */
    .metrics-strip {
      background: #07090E;
      border-top: 1px solid var(--border-line);
      border-bottom: 1px solid var(--border-line);
      padding: 3rem 0;
    }
    .metric-number {
      font-size: 2.85rem;
      font-weight: 900;
      color: var(--neon-green);
      font-family: monospace;
      line-height: 1.1;
      margin-bottom: 0.35rem;
      text-shadow: 0 0 16px rgba(0, 255, 135, 0.35);
    }

    /* 板块 10: 流程步骤 */
    .step-node {
      position: relative;
      padding-top: 1.5rem;
    }
    .step-badge {
      font-size: 0.85rem;
      font-weight: 800;
      color: #070B11;
      background: var(--neon-green);
      width: 32px;
      height: 32px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      margin-bottom: 1rem;
      box-shadow: 0 0 12px var(--neon-green);
    }

    /* 板块 12: 常见问题手风琴 */
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      margin-bottom: 1.1rem;
      overflow: hidden;
    }
    .faq-question {
      padding: 1.25rem 1.5rem;
      font-weight: 700;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: #FFF;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--neon-cyan);
    }
    .faq-toggle-icon {
      color: var(--neon-green);
      font-size: 1.3rem;
      font-weight: 400;
    }
    .faq-answer {
      padding: 0 1.5rem 1.35rem;
      color: var(--text-muted);
      font-size: 0.9375rem;
      line-height: 1.7;
    }

    /* 板块 13: 转化表单 */
    .consult-form {
      display: grid;
      grid-template-columns: repeat(3, 1fr) auto;
      gap: 1rem;
      margin-top: 1.75rem;
    }
    .form-control-neon {
      width: 100%;
      background: #090D14;
      border: 1px solid rgba(255, 255, 255, 0.15);
      color: #FFF;
      padding: 0.75rem 1rem;
      border-radius: var(--radius-sm);
      outline: none;
      font-size: 0.9375rem;
    }
    .form-control-neon:focus {
      border-color: var(--neon-green);
      box-shadow: 0 0 12px rgba(0, 255, 135, 0.25);
    }

    /* 浮动底栏行动条 (可选板块) */
    .sticky-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(8, 10, 15, 0.95);
      border-top: 1px solid var(--border-glow);
      padding: 0.7rem 0;
      z-index: 990;
      backdrop-filter: blur(10px);
    }
    .sticky-bar-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
    }

    /* 页脚规范 */
    .site-footer {
      background: #05070B;
      border-top: 1px solid var(--border-line);
      padding: 4.5rem 0 2.5rem;
      color: var(--text-muted);
      font-size: 0.875rem;
      padding-bottom: 5.5rem; /* 预留给浮动栏 */
    }
    .footer-col h5 {
      color: #FFF;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    .footer-links {
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .footer-links li {
      margin-bottom: 0.65rem;
    }
    .copyright-line {
      margin-top: 3.5rem;
      padding-top: 1.75rem;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 1rem;
      font-size: 0.8125rem;
    }

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .hero-title { font-size: 2.5rem; }
      .consult-form { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hero-title { font-size: 2rem; }
      .content-section { padding: 3.75rem 0; }
      .consult-form { grid-template-columns: 1fr; }
      .sticky-bar { display: none; }
      .site-footer { padding-bottom: 2.5rem; }
    }