/* roulang page: index */
/* ----- 设计变量与全局重置 ----- */
    :root {
      --primary: #A855F7;
      --primary-glow: #C084FC;
      --accent-cyan: #22D3EE;
      --accent-amber: #F59E0B;
      --bg-deep: #0F0B1A;
      --bg-card: rgba(30, 20, 50, 0.8);
      --text-white: #FFFFFF;
      --text-light: #C4B5E3;
      --text-muted: #8B7AA0;
      --border-subtle: rgba(168, 85, 247, 0.25);
      --border-glow: rgba(168, 85, 247, 0.6);
      --radius-card: 20px;
      --radius-btn: 12px;
      --radius-badge: 50px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-hover: 0 12px 40px rgba(168,85,247,0.3);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      --font-numbers: 'Inter', 'SF Mono', 'Roboto Mono', monospace;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deep);
    }
    body {
      font-family: var(--font-body);
      background: var(--bg-deep);
      color: var(--text-light);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 字体数字专用类 */
    .num-font {
      font-family: var(--font-numbers);
      font-weight: 700;
    }

    /* ----- 导航 (沉浸式吸顶) ----- */
    #nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(15, 11, 26, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--primary);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
      height: 72px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      background: linear-gradient(135deg, #A855F7 0%, #C084FC 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      display: inline-block;
      width: 24px;
      height: 24px;
      background: var(--accent-cyan);
      clip-path: polygon(50% 0%, 85% 38%, 75% 100%, 50% 75%, 25% 100%, 15% 38%);
      margin-right: 4px;
      filter: drop-shadow(0 0 6px var(--accent-cyan));
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-light);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover {
      color: var(--accent-cyan);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.3s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(168,85,247,0.5);
    }
    .btn-nav:hover {
      background: var(--primary-glow);
      transform: translateY(-2px);
    }
    /* 移动端汉堡菜单 */
    #menu-toggle {
      display: none;
    }
    .menu-icon {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .menu-icon span {
      width: 28px;
      height: 3px;
      background: var(--accent-cyan);
      border-radius: 2px;
      transition: var(--transition);
    }

    /* ----- 通用区块 ----- */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      color: var(--text-light);
      max-width: 700px;
      margin-bottom: 48px;
    }

    /* ----- 按钮体系 ----- */
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      box-shadow: 0 4px 14px rgba(168,85,247,0.4);
      transition: var(--transition);
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-glow);
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(168,85,247,0.6);
    }
    .btn-outline {
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      background: transparent;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: var(--transition);
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(34, 211, 238, 0.1);
      transform: translateY(-2px);
    }
    .link-amber {
      color: var(--accent-amber);
      border-bottom: 1px dashed var(--accent-amber);
      font-weight: 500;
    }
    .link-amber:hover {
      border-bottom-style: solid;
    }

    /* ----- Hero 双栏 ----- */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      margin-bottom: 24px;
    }
    .hero-left .sub {
      font-size: 1.1rem;
      color: var(--text-light);
      margin-bottom: 32px;
    }
    .badge-group {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }
    .data-badge {
      background: linear-gradient(135deg, #A855F7, #0F0B1A);
      border: 1px solid var(--border-subtle);
      border-radius: 40px;
      padding: 10px 20px;
      color: white;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 0 16px rgba(168,85,247,0.4);
    }
    .data-badge .num {
      font-family: var(--font-numbers);
      color: var(--accent-cyan);
      font-size: 1.4rem;
    }
    .hero-right {
      position: relative;
      display: flex;
      justify-content: center;
    }
    .score-card {
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-card);
      padding: 32px;
      width: 100%;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-subtle);
      animation: float 5s infinite ease-in-out;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-10px); }
      100% { transform: translateY(0); }
    }
    .teams {
      display: flex;
      justify-content: space-between;
      font-weight: 700;
      font-size: 1.5rem;
      color: white;
      margin-bottom: 20px;
    }
    .score {
      font-family: var(--font-numbers);
      font-size: 3rem;
      color: var(--accent-cyan);
      text-align: center;
      margin: 12px 0;
      text-shadow: 0 0 15px #22D3EE;
    }
    .progress-bar {
      height: 6px;
      background: rgba(255,255,255,0.2);
      border-radius: 10px;
      margin: 16px 0;
      overflow: hidden;
    }
    .progress-fill {
      width: 68%;
      height: 100%;
      background: var(--primary);
      border-radius: 10px;
      box-shadow: 0 0 10px var(--primary);
    }

    /* ----- 数据亮点网格 ----- */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: linear-gradient(145deg, #1E0A3C, #0F0B1A);
      border-radius: var(--radius-card);
      padding: 40px 20px;
      text-align: center;
      transition: var(--transition);
      border: 1px solid var(--border-subtle);
    }
    .stat-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .stat-number {
      font-family: var(--font-numbers);
      font-size: 4.5rem;
      font-weight: 900;
      color: var(--accent-cyan);
      line-height: 1;
    }
    .stat-label {
      color: white;
      font-weight: 600;
      margin-top: 12px;
    }

    /* ----- 服务杂志流 ----- */
    .service-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 80px;
    }
    .service-img {
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .service-img img {
      width: 100%;
      height: 320px;
      object-fit: cover;
      border-radius: var(--radius-card);
    }
    .service-img::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(168,85,247,0.25);
      border: 1px solid var(--accent-cyan);
      border-radius: var(--radius-card);
      pointer-events: none;
    }
    .service-text h3 {
      font-size: 1.8rem;
      color: white;
      margin-bottom: 16px;
    }
    .feature-list {
      list-style: none;
      margin: 20px 0;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }
    .feature-list li::before {
      content: "■";
      color: var(--accent-cyan);
      font-size: 1.2rem;
    }

    /* ----- 方案对比 ----- */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .plan-card {
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-card);
      padding: 40px 32px;
      border: 1px solid var(--border-subtle);
      position: relative;
      transition: var(--transition);
    }
    .plan-card.pro {
      border: 2px solid var(--primary);
      box-shadow: 0 0 28px rgba(168,85,247,0.4);
    }
    .badge-recommend {
      position: absolute;
      top: 20px;
      right: 20px;
      background: var(--accent-amber);
      color: #0F0B1A;
      font-weight: 700;
      padding: 5px 18px;
      border-radius: 20px;
      transform: rotate(-8deg);
    }
    .plan-price {
      font-family: var(--font-numbers);
      font-size: 3rem;
      color: var(--accent-cyan);
    }
    .plan-features li {
      margin: 16px 0;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* ----- 案例瀑布 ----- */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
    }
    .case-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: var(--transition);
      position: relative;
    }
    .case-card img {
      height: 200px;
      object-fit: cover;
    }
    .case-info {
      padding: 20px;
    }
    .case-tag {
      background: var(--accent-amber);
      color: #0F0B1A;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    /* ----- FAQ 手风琴 ----- */
    .faq-grid {
      display: grid;
      grid-template-columns: 30% 70%;
      gap: 40px;
    }
    .accordion-item {
      background: var(--bg-card);
      border-radius: 12px;
      margin-bottom: 12px;
    }
    .accordion-header {
      padding: 16px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    /* ----- CTA 全宽 ----- */
    .cta-full {
      background: linear-gradient(135deg, #0F0B1A 0%, #1E0A3C 100%);
      background-image: linear-gradient(rgba(168,85,247,0.1) 1px, transparent 1px), linear-gradient(90deg, rgba(168,85,247,0.1) 1px, transparent 1px);
      background-size: 40px 40px;
      text-align: center;
      padding: 100px 24px;
    }

    /* ----- 页脚 ----- */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 30px;
    }
    .copyright {
      text-align: center;
      font-size: 0.8rem;
      color: var(--text-muted);
      border-top: 1px solid var(--border-subtle);
      padding-top: 24px;
    }

    /* ----- 响应式 ----- */
    @media (max-width: 1024px) {
      .hero-grid, .service-row, .faq-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-icon { display: flex; }
      #menu-toggle:checked ~ .nav-links {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #0F0B1A;
        padding: 24px;
      }
      .stats-grid, .compare-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
    }