/* roulang page: index */
:root {
      --primary: #9333ea;
      --primary-light: #c084fc;
      --primary-dark: #6b21a8;
      --secondary: #06b6d4;
      --accent: #f43f5e;
      --bg-dark: #09090b;
      --bg-card: #18181b;
      --bg-card-hover: #27272a;
      --bg-light: #1f2937;
      --text-main: #f4f4f5;
      --text-muted: #a1a1aa;
      --text-dim: #71717a;
      --border-color: #27272a;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
      --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.7), 0 0 20px rgba(147, 51, 234, 0.15);
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    }

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

    body {
      font-family: var(--font-stack);
      background-color: var(--bg-dark);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .site-header {
      background: rgba(9, 9, 11, 0.85);
      backdrop-filter: blur(12px);
      position: sticky;
      top: 0;
      z-index: 100;
      border-bottom: 1px solid var(--border-color);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .brand-logo {
      font-size: 1.4rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #fff 30%, var(--primary-light) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .brand-logo::before {
      content: "🎬";
      font-size: 1.25rem;
      -webkit-text-fill-color: initial;
    }
    .main-nav {
      display: flex;
      align-items: center;
      gap: 24px;
    }
    .nav-item {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 6px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }
    .nav-item:hover, .nav-item.active {
      color: #fff;
      background: rgba(255, 255, 255, 0.08);
    }
    .nav-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 14px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 600;
      box-shadow: 0 2px 10px rgba(147, 51, 234, 0.3);
    }

    /* 矮横幅 Hero */
    .hero-banner {
      position: relative;
      padding: 50px 0 60px;
      background: radial-gradient(circle at 80% 20%, rgba(147, 51, 234, 0.15) 0%, transparent 60%),
                  radial-gradient(circle at 10% 80%, rgba(6, 182, 212, 0.12) 0%, transparent 50%),
                  var(--bg-dark);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }
    .hero-strip {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
    }
    .hero-content {
      max-width: 680px;
    }
    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      background: rgba(147, 51, 234, 0.18);
      color: var(--primary-light);
      border: 1px solid rgba(147, 51, 234, 0.35);
      border-radius: 9999px;
      font-size: 0.8rem;
      font-weight: 600;
      margin-bottom: 14px;
    }
    .hero-title {
      font-size: 2.2rem;
      line-height: 1.25;
      font-weight: 800;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }
    .hero-lead {
      color: var(--text-muted);
      font-size: 1rem;
      line-height: 1.6;
      margin-bottom: 22px;
    }
    .hero-actions {
      display: flex;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-media {
      flex-shrink: 0;
      width: 420px;
      height: 220px;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
      position: relative;
    }
    .hero-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      filter: brightness(0.9);
      transition: transform 0.4s ease;
    }
    .hero-media:hover img {
      transform: scale(1.04);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      border: none;
      transition: all 0.2s ease;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #fff;
      box-shadow: 0 4px 14px rgba(147, 51, 234, 0.35);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-light), var(--primary));
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: rgba(255, 255, 255, 0.08);
      color: #fff;
      border: 1px solid var(--border-color);
    }
    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.15);
      border-color: rgba(255, 255, 255, 0.25);
    }

    /* 通用 Section 样式 */
    section {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .section-alt {
      background: #111115;
    }
    .section-header {
      margin-bottom: 40px;
      max-width: 720px;
    }
    .section-tag {
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--secondary);
      margin-bottom: 8px;
      display: block;
    }
    .section-title {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 12px;
    }
    .section-desc {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    /* 网格与圆角大卡 */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .card:hover {
      transform: translateY(-4px);
      border-color: rgba(147, 51, 234, 0.4);
      box-shadow: var(--shadow-lg);
    }
    .card-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 6px;
      background: rgba(147, 51, 234, 0.2);
      color: var(--primary-light);
      margin-bottom: 12px;
    }
    .card-badge.cyan {
      background: rgba(6, 182, 212, 0.18);
      color: var(--secondary);
    }
    .card-badge.rose {
      background: rgba(244, 63, 94, 0.18);
      color: var(--accent);
    }
    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .card-text {
      color: var(--text-muted);
      font-size: 0.9rem;
      line-height: 1.55;
    }

    /* 数据徽章组件 */
    .stat-badge-wrap {
      display: flex;
      align-items: baseline;
      gap: 6px;
      margin-bottom: 10px;
    }
    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      line-height: 1;
      background: linear-gradient(135deg, #fff, var(--primary-light));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .stat-unit {
      color: var(--secondary);
      font-size: 0.9rem;
      font-weight: 600;
    }

    /* 推广物料卡片 / 媒体网格 */
    .media-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
    }
    .media-thumb {
      height: 180px;
      overflow: hidden;
      position: relative;
    }
    .media-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .media-card:hover .media-thumb img {
      transform: scale(1.06);
    }
    .media-body {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    /* 结算说明/流程步骤条 */
    .step-list {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .step-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      position: relative;
    }
    .step-index {
      font-size: 1.8rem;
      font-weight: 900;
      color: rgba(255, 255, 255, 0.12);
      position: absolute;
      top: 14px;
      right: 18px;
    }

    /* 成功案例墙 */
    .case-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-color);
      display: flex;
      gap: 18px;
      align-items: flex-start;
    }
    .case-avatar {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: var(--border-color);
      flex-shrink: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
    }

    /* 热度列表与文章资讯 */
    .news-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .news-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      transition: all 0.2s ease;
    }
    .news-item:hover {
      border-color: var(--primary);
      transform: translateX(6px);
    }
    .news-info {
      max-width: 800px;
    }
    .news-title {
      font-size: 1.1rem;
      font-weight: 600;
      margin-bottom: 6px;
    }
    .news-meta {
      font-size: 0.85rem;
      color: var(--text-dim);
      display: flex;
      gap: 16px;
    }

    /* 筛选与分类条 */
    .filter-bar {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
      margin-bottom: 28px;
    }
    .filter-chip {
      padding: 8px 18px;
      border-radius: 9999px;
      font-size: 0.88rem;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      color: var(--text-muted);
      cursor: pointer;
      transition: all 0.2s;
    }
    .filter-chip.active, .filter-chip:hover {
      background: var(--primary);
      color: #fff;
      border-color: var(--primary);
    }

    /* 单一收口加入入口 */
    .cta-banner {
      background: linear-gradient(135deg, rgba(147, 51, 234, 0.2), rgba(6, 182, 212, 0.15)), var(--bg-card);
      border: 1px solid rgba(147, 51, 234, 0.4);
      border-radius: var(--radius-lg);
      padding: 48px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
      box-shadow: var(--shadow-lg);
    }
    .cta-content {
      max-width: 650px;
    }

    /* 页脚 */
    .site-footer {
      background: #050507;
      padding: 50px 0 30px;
      border-top: 1px solid var(--border-color);
      color: var(--text-dim);
      font-size: 0.9rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand {
      color: #fff;
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 14px;
      display: inline-block;
    }
    .footer-col h4 {
      color: #fff;
      font-size: 0.95rem;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-col a:hover {
      color: var(--primary-light);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-strip {
        flex-direction: column;
        align-items: flex-start;
      }
      .hero-media {
        width: 100%;
        height: 240px;
      }
      .grid-4, .step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .section-title {
        font-size: 1.5rem;
      }
      .hero-title {
        font-size: 1.7rem;
      }
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .cta-banner {
        flex-direction: column;
        align-items: flex-start;
        padding: 30px;
      }
      .news-item {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    @media (max-width: 520px) {
      .grid-4, .step-list {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .header-inner {
        height: 60px;
      }
    }