/* roulang page: index */
:root {
      --deep-black: #0A0E14;
      --surface-dark: #161B22;
      --high-speed-cyan: #00F0FF;
      --pulse-magenta: #FF3CAC;
      --white: #FFFFFF;
      --gray-muted: #B0B8C1;
      --footer-gray: #5A6268;
      --border-dim: rgba(0, 240, 255, 0.15);
      --border-glow: #00F0FF;
      --shadow-hard: 0px 4px 0px rgba(0, 240, 255, 0.2);
      --radius-card: 12px;
      --transition-smooth: 0.25s ease-out;
      --font-title: 'Inter', 'PingFang SC', sans-serif;
      --font-body: 'Inter', 'PingFang SC', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      background-color: var(--deep-black);
      color: var(--white);
      font-family: var(--font-body);
      font-weight: 400;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    /* 基础重置 */
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    button, input {
      font-family: inherit;
    }

    h1, h2, h3, h4, p {
      margin: 0;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 自定义覆盖 Foundation 默认风格 */
    .grid-container {
      padding: 0;
    }

    /* 板块间距 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 640px) {
      section {
        padding: 70px 0;
      }
    }

    /* ---- 导航栏 ---- */
    #nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 99;
      background: rgba(10, 14, 20, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-dim);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .logo {
      display: flex;
      align-items: center;
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      color: var(--white);
    }

    .logo i {
      font-size: 2rem;
      color: var(--high-speed-cyan);
      margin-right: 8px;
      filter: drop-shadow(0 0 6px rgba(0,240,255,0.6));
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      font-weight: 500;
      color: var(--gray-muted);
    }

    .nav-links a {
      transition: color 0.2s;
      font-size: 0.95rem;
    }

    .nav-links a:hover {
      color: var(--high-speed-cyan);
    }

    .nav-cta {
      background: var(--pulse-magenta);
      color: white;
      padding: 10px 24px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 0.9rem;
      letter-spacing: 0.3px;
      transition: box-shadow 0.3s, transform 0.2s;
      box-shadow: 0 0 12px rgba(255, 60, 172, 0.5);
      white-space: nowrap;
    }

    .nav-cta:hover {
      box-shadow: 0 0 22px rgba(255, 60, 172, 0.9);
      transform: translateY(-1px);
    }

    .mobile-toggle {
      display: none;
      font-size: 1.8rem;
      color: var(--high-speed-cyan);
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-toggle {
        display: block;
        cursor: pointer;
      }
      .nav-container {
        height: 65px;
      }
    }

    /* ---- Hero ---- */
    #hero {
      background: radial-gradient(circle at 30% 40%, #0f1722 0%, var(--deep-black) 80%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 70px;
    }

    .hero-bg-img {
      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: 0.45;
      z-index: 0;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-icon {
      font-size: 4rem;
      color: var(--high-speed-cyan);
      margin-bottom: 20px;
      filter: drop-shadow(0 0 20px #00F0FF);
      animation: float 3s ease-in-out infinite;
    }

    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }

    h1 {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 4rem;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: var(--white);
      text-shadow: 0 0 15px rgba(0,240,255,0.3);
      margin-bottom: 1.5rem;
    }

    .hero-sub {
      font-size: 1.3rem;
      color: var(--gray-muted);
      max-width: 650px;
      margin: 0 auto 2.5rem;
    }

    .hero-stats {
      display: flex;
      justify-content: center;
      gap: 60px;
      margin-top: 2rem;
    }

    .stat-item {
      font-family: var(--font-mono);
      font-size: 2.2rem;
      font-weight: 600;
      color: var(--high-speed-cyan);
      display: flex;
      flex-direction: column;
    }

    .stat-item small {
      font-size: 0.9rem;
      color: var(--gray-muted);
      font-family: var(--font-body);
    }

    @media (max-width: 640px) {
      h1 {
        font-size: 2.4rem;
      }
      .hero-stats {
        flex-direction: column;
        gap: 25px;
      }
    }

    /* ---- 实时指标看板 ---- */
    #dashboard {
      background: var(--surface-dark);
    }

    .dashboard-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }

    .metric-card {
      background: #161B22;
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      flex: 1 1 250px;
      box-shadow: var(--shadow-hard);
      transition: var(--transition-smooth);
    }

    .metric-card:hover {
      border-color: var(--border-glow);
      transform: translateY(-4px);
    }

    .metric-title {
      font-size: 0.9rem;
      color: var(--gray-muted);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .metric-value {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 600;
      color: var(--high-speed-cyan);
    }

    .pulse-dot {
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--pulse-magenta);
      border-radius: 50%;
      margin-left: 6px;
      box-shadow: 0 0 10px var(--pulse-magenta);
    }

    /* ---- 服务矩阵 ---- */
    #services {
      background: var(--deep-black);
    }

    .section-title {
      font-family: var(--font-title);
      font-size: 2.7rem;
      font-weight: 800;
      margin-bottom: 1rem;
      letter-spacing: -0.02em;
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
      margin-top: 50px;
    }

    .service-card {
      background: #161B22;
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-card);
      padding: 32px 20px;
      transition: var(--transition-smooth);
      box-shadow: var(--shadow-hard);
    }

    .service-card:hover {
      border-color: var(--border-glow);
      transform: translateY(-6px);
    }

    .service-card i {
      font-size: 2.3rem;
      color: var(--high-speed-cyan);
      margin-bottom: 20px;
      transition: transform 0.2s;
    }

    .service-card:hover i {
      transform: rotate(8deg);
      color: var(--pulse-magenta);
    }

    .service-card h3 {
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .service-card p {
      color: var(--gray-muted);
      font-size: 0.95rem;
    }

    /* 非对称布局：第一个卡片跨两列，其余自适应 */
    .service-card:first-child {
      grid-column: span 2;
    }

    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
      .service-card:first-child {
        grid-column: span 1;
      }
    }

    /* ---- 效能对比器 ---- */
    #comparison {
      background: var(--surface-dark);
    }

    .compare-wrapper {
      display: flex;
      align-items: stretch;
      gap: 0;
      border-radius: var(--radius-card);
      overflow: hidden;
      background: #161B22;
      border: 1px solid var(--border-dim);
      margin-top: 50px;
    }

    .compare-left, .compare-right {
      flex: 1;
      padding: 40px 28px;
    }

    .compare-left {
      background: #1a1e26;
      color: #7a7f88;
    }

    .compare-right {
      background: #0f1923;
      border-left: 2px solid var(--high-speed-cyan);
      color: white;
    }

    .compare-left h3, .compare-right h3 {
      font-size: 1.8rem;
      margin-bottom: 25px;
      font-weight: 700;
    }

    .compare-left h3 {
      text-decoration: line-through;
      color: #5a5e66;
    }

    .compare-item {
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.1rem;
    }

    .compare-right .compare-item i {
      color: var(--high-speed-cyan);
    }

    @media (max-width: 640px) {
      .compare-wrapper {
        flex-direction: column;
      }
    }

    /* ---- FAQ ---- */
    .faq-item {
      background: #161B22;
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: white;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--gray-muted);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-item.active .faq-question i {
      transform: rotate(180deg);
      color: var(--high-speed-cyan);
    }

    /* ---- CTA ---- */
    #cta {
      background: linear-gradient(135deg, rgba(255,60,172,0.12) 0%, rgba(0,240,255,0.1) 100%);
    }

    .cta-box {
      background: rgba(22,27,34,0.8);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-dim);
      border-radius: 24px;
      padding: 60px;
      text-align: center;
      max-width: 700px;
      margin: 0 auto;
    }

    .cta-input {
      background: #0A0E14;
      border: 1px solid var(--high-speed-cyan);
      color: white;
      padding: 14px 20px;
      border-radius: 30px;
      width: 70%;
      margin-right: 12px;
    }

    .cta-btn {
      background: var(--pulse-magenta);
      border: none;
      padding: 14px 32px;
      border-radius: 30px;
      font-weight: 700;
      color: white;
    }

    /* 页脚 */
    #footer {
      background: #0A0E14;
      padding: 28px 0;
      border-top: 1px solid rgba(255,255,255,0.05);
      color: var(--footer-gray);
      font-size: 0.9rem;
    }

    .footer-flex {
      display: flex;
      justify-content: space-between;
    }

    @media (max-width: 500px) {
      .footer-flex {
        flex-direction: column;
        gap: 8px;
        text-align: center;
      }
    }