/* roulang page: index */
:root {
      --deep-charcoal: #1E2A2A;
      --electric-lime: #C8FF00;
      --matte-white: #F4F5F0;
      --graphite-black: #121212;
      --alert-orange: #FF4E00;
      --border-glow: rgba(200, 255, 0, 0.2);
      --card-bg-solid: #ffffff;
      --card-bg-dark: rgba(18, 18, 18, 0.7);
      --text-primary: #121212;
      --text-secondary: #1E2A2A;
      --text-on-dark: #F4F5F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.08);
      --shadow-hover: 0 16px 32px rgba(0, 0, 0, 0.15);
      --font-sans: 'Noto Sans SC', sans-serif;
      --font-mono: 'Inter', sans-serif;
      --section-gap: 100px;
      --container-max: 1280px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--matte-white);
      color: var(--text-primary);
      line-height: 1.6;
      font-weight: 300;
      overflow-x: hidden;
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

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

    /* 导航栏 - 沉浸式半透明 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(18, 18, 18, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(200, 255, 0, 0.15);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 0.5px;
      color: var(--electric-lime);
    }
    .logo i {
      font-size: 2rem;
      color: var(--electric-lime);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      color: var(--matte-white);
      font-weight: 400;
      font-size: 1rem;
      position: relative;
      padding: 4px 0;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--electric-lime);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    .nav-link:hover {
      color: var(--electric-lime);
    }
    .btn-nav {
      background: transparent;
      border: 1px solid var(--electric-lime);
      color: var(--electric-lime);
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      transition: all 0.2s;
    }
    .btn-nav:hover {
      background: var(--electric-lime);
      color: var(--graphite-black);
      border-color: var(--electric-lime);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--electric-lime);
      cursor: pointer;
    }

    /* Hero 区块 */
    .hero {
      background: var(--graphite-black);
      padding: 140px 0 80px;
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: center;
      min-height: 80vh;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(200,255,0,0.08) 0%, transparent 50%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--electric-lime);
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-content p {
      font-size: 1.2rem;
      color: var(--text-on-dark);
      margin-bottom: 32px;
      font-weight: 300;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--electric-lime);
      color: var(--graphite-black);
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      cursor: pointer;
      transition: all 0.2s;
      border: 2px solid var(--electric-lime);
    }
    .btn-primary:hover {
      background: var(--alert-orange);
      border-color: var(--alert-orange);
      color: white;
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--electric-lime);
      color: var(--electric-lime);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      cursor: pointer;
      transition: all 0.2s;
    }
    .btn-secondary:hover {
      background: var(--electric-lime);
      color: var(--graphite-black);
    }
    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      border: 1px solid var(--border-glow);
    }

    /* 板块通用 */
    .section {
      padding: var(--section-gap) 0;
    }
    .section-dark {
      background: var(--graphite-black);
      color: var(--text-on-dark);
    }
    .section-charcoal {
      background: var(--deep-charcoal);
      color: var(--text-on-dark);
    }
    .section-light {
      background: var(--matte-white);
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .section-subtitle {
      font-size: 1.1rem;
      opacity: 0.8;
      margin-bottom: 48px;
      font-weight: 300;
    }

    /* 实时数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: rgba(30, 42, 42, 0.8);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 3.8rem;
      font-weight: 700;
      color: var(--electric-lime);
      line-height: 1.1;
    }
    .stat-label {
      font-size: 1rem;
      color: var(--matte-white);
      margin-top: 8px;
    }

    /* 服务矩阵 非对称 */
    .service-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg-solid);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
      border: 1px solid rgba(0,0,0,0.05);
      transition: all 0.3s;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      border-color: var(--electric-lime);
    }
    .service-card img {
      width: 60px;
      height: 60px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 1.6rem;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .service-right {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    /* 对比卡片 */
    .compare-panel {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .compare-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }
    .compare-card.legacy {
      background: #f0f0f0;
      opacity: 0.8;
    }
    .compare-card.pp {
      border: 2px solid var(--electric-lime);
      background: white;
      box-shadow: 0 12px 28px rgba(200,255,0,0.1);
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid #e0e0e0;
    }

    /* 案例数字 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      text-align: center;
    }
    .big-stat {
      font-family: var(--font-mono);
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--electric-lime);
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA 表单 */
    .cta-form {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    .cta-form input {
      flex: 1;
      padding: 14px;
      border-radius: var(--radius-sm);
      border: none;
    }

    /* 页脚 */
    .footer {
      background: var(--graphite-black);
      color: var(--matte-white);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .dashboard-grid { grid-template-columns: repeat(2,1fr); }
      .service-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .dashboard-grid { grid-template-columns: 1fr; }
      .compare-panel { grid-template-columns: 1fr; }
      .stats-row { flex-wrap: wrap; gap: 20px; }
      .footer-grid { grid-template-columns: 1fr; }
    }