/* roulang page: index */
:root {
      --bg-primary: #060B18;
      --bg-secondary: #0A1226;
      --bg-card: rgba(15, 23, 42, 0.75);
      --bg-card-hover: rgba(30, 41, 59, 0.85);
      --primary: #2563EB;
      --primary-light: #3B82F6;
      --accent: #06B6D4;
      --accent-glow: rgba(6, 182, 212, 0.35);
      --text-main: #FFFFFF;
      --text-muted: #94A3B8;
      --text-dim: #64748B;
      --border-color: rgba(59, 130, 246, 0.18);
      --border-active: rgba(6, 182, 212, 0.5);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-glow: 0 0 25px rgba(37, 99, 235, 0.45);
      --shadow-cyan: 0 0 20px rgba(6, 182, 212, 0.3);
      --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-primary);
      color: var(--text-main);
      font-family: var(--font-stack);
    }

    body {
      line-height: 1.75;
      overflow-x: hidden;
      background-color: var(--bg-primary);
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 顶部双行导航 */
    .top-bar {
      background: rgba(6, 11, 24, 0.95);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      font-size: 12px;
      color: var(--text-dim);
      padding: 8px 0;
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-info span {
      margin-right: 20px;
    }
    .top-info i {
      color: var(--accent);
      margin-right: 6px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(6, 11, 24, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-color);
      height: 72px;
    }
    .site-header .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 100%;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 700;
      color: #fff;
      letter-spacing: -0.5px;
    }
    .brand-logo i {
      color: var(--accent);
      font-size: 24px;
      filter: drop-shadow(0 0 8px var(--accent));
    }
    .main-nav {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--text-main);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.3s ease;
      box-shadow: 0 0 8px var(--accent);
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      border: 1px solid transparent;
      line-height: 1.2;
    }
    .btn-glow {
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: #fff;
      box-shadow: var(--shadow-glow);
    }
    .btn-glow:hover {
      background: linear-gradient(135deg, var(--primary-light), var(--accent));
      box-shadow: 0 0 30px rgba(6, 182, 212, 0.6);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: rgba(15, 23, 42, 0.6);
      border-color: var(--border-color);
      color: var(--text-muted);
      backdrop-filter: blur(8px);
    }
    .btn-outline:hover {
      border-color: var(--accent);
      color: #fff;
      background: rgba(30, 41, 59, 0.8);
      transform: translateY(-2px);
    }

    /* 通用板块排版 */
    .section {
      padding: 100px 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--bg-secondary);
      border-top: 1px solid rgba(255, 255, 255, 0.03);
      border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    }
    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 60px auto;
    }
    .section-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 16px;
      background: rgba(37, 99, 235, 0.12);
      border: 1px solid var(--border-color);
      border-radius: 50px;
      color: var(--accent);
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 16px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 18px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.8;
    }

    /* 卡片玻璃拟态 */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glass-card:hover {
      border-color: var(--border-active);
      transform: translateY(-4px);
      background: var(--bg-card-hover);
      box-shadow: 0 16px 32px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.15);
    }

    /* 板块 1: Hero 产品截图舞台居中 */
    .hero-section {
      padding: 80px 0 110px 0;
      background: radial-gradient(circle at 50% 20%, rgba(37, 99, 235, 0.25), transparent 70%), var(--bg-primary);
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }
    .hero-title {
      font-size: 3.25rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 24px;
      background: linear-gradient(180deg, #FFFFFF 0%, #CBD5E1 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-title span {
      background: linear-gradient(90deg, #3B82F6, #06B6D4);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.8;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 18px;
      margin-bottom: 48px;
    }
    .hero-stage {
      position: relative;
      margin: 0 auto;
      max-width: 1040px;
      border-radius: var(--radius-lg);
      padding: 12px;
      background: linear-gradient(180deg, rgba(59, 130, 246, 0.3), rgba(6, 182, 212, 0.05));
      border: 1px solid rgba(59, 130, 246, 0.3);
      box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.8), 0 0 40px rgba(37, 99, 235, 0.2);
    }
    .hero-stage img {
      border-radius: var(--radius-md);
      width: 100%;
      height: 480px;
      object-fit: cover;
    }
    .hero-stage-badge {
      position: absolute;
      bottom: 30px;
      left: 30px;
      background: rgba(6, 11, 24, 0.85);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-color);
      padding: 12px 24px;
      border-radius: 50px;
      display: flex;
      align-items: center;
      gap: 12px;
      color: #fff;
      font-size: 14px;
    }
    .hero-stage-badge .status-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #10B981;
      box-shadow: 0 0 10px #10B981;
    }

    /* 板块 2: 创作痛点解构 */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .pain-card {
      border-left: 3px solid #EF4444;
    }
    .pain-icon {
      width: 50px;
      height: 50px;
      border-radius: 12px;
      background: rgba(239, 68, 68, 0.15);
      color: #F87171;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 20px;
    }
    .pain-card h3 {
      font-size: 18px;
      margin-bottom: 12px;
      color: #fff;
    }
    .pain-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 3: 技术架构与引擎 */
    .split-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .split-content h2 {
      font-size: 2.2rem;
      margin-bottom: 20px;
      line-height: 1.3;
    }
    .split-content p {
      color: var(--text-muted);
      margin-bottom: 24px;
      font-size: 15px;
    }
    .engine-metrics {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 30px;
    }
    .metric-box {
      background: rgba(15, 23, 42, 0.6);
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
    }
    .metric-box strong {
      display: block;
      font-size: 22px;
      color: var(--accent);
      margin-bottom: 4px;
    }
    .metric-box span {
      font-size: 13px;
      color: var(--text-dim);
    }
    .split-visual img {
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      width: 100%;
      height: 380px;
      object-fit: cover;
    }

    /* 板块 4: 核心技术矩阵 (3x2) */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card .feature-icon {
      width: 56px;
      height: 56px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(37, 99, 235, 0.2), rgba(6, 182, 212, 0.15));
      border: 1px solid rgba(6, 182, 212, 0.3);
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      margin-bottom: 22px;
    }
    .feature-card h3 {
      font-size: 19px;
      margin-bottom: 12px;
      color: #fff;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 板块 5: 热门工具矩阵 */
    .product-card {
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .product-img {
      border-radius: var(--radius-sm);
      overflow: hidden;
      margin-bottom: 20px;
      height: 200px;
    }
    .product-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .product-card:hover .product-img img {
      transform: scale(1.05);
    }
    .product-card h3 {
      font-size: 20px;
      margin-bottom: 12px;
      color: #fff;
    }
    .product-tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      margin-bottom: 16px;
    }
    .product-tag {
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 4px;
      background: rgba(255, 255, 255, 0.06);
      color: var(--accent);
    }
    .product-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 24px;
      flex-grow: 1;
    }

    /* 板块 6: 4步工作流 */
    .workflow-track {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .workflow-track::before {
      content: '';
      position: absolute;
      top: 35px;
      left: 10%;
      right: 10%;
      height: 2px;
      background: linear-gradient(90deg, var(--primary), var(--accent));
      z-index: 1;
      opacity: 0.4;
    }
    .step-card {
      position: relative;
      z-index: 2;
      text-align: center;
      padding-top: 10px;
    }
    .step-number {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--bg-secondary);
      border: 2px solid var(--accent);
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      font-weight: 700;
      margin: 0 auto 20px auto;
      box-shadow: 0 0 15px var(--accent-glow);
    }
    .step-card h3 {
      font-size: 18px;
      margin-bottom: 10px;
      color: #fff;
    }
    .step-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 7: 深度模型调优实践案例 */
    .case-container {
      background: linear-gradient(180deg, rgba(10, 18, 38, 0.9), rgba(6, 11, 24, 0.95));
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 48px;
    }
    .case-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .case-info h3 {
      font-size: 26px;
      margin-bottom: 16px;
      color: #fff;
    }
    .case-info p {
      color: var(--text-muted);
      margin-bottom: 20px;
      font-size: 15px;
    }
    .case-points {
      list-style: none;
      margin-bottom: 28px;
    }
    .case-points li {
      margin-bottom: 10px;
      font-size: 14px;
      color: #CBD5E1;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .case-points li i {
      color: #10B981;
    }
    .case-banner img {
      border-radius: var(--radius-md);
      width: 100%;
      height: 320px;
      object-fit: cover;
    }

    /* 板块 8: 适用人群与场景 */
    .persona-card {
      text-align: left;
    }
    .persona-badge {
      display: inline-block;
      font-size: 12px;
      color: var(--accent);
      background: rgba(6, 182, 212, 0.1);
      padding: 4px 10px;
      border-radius: 4px;
      margin-bottom: 14px;
    }
    .persona-card h3 {
      font-size: 18px;
      margin-bottom: 12px;
      color: #fff;
    }
    .persona-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 9: 关键数据与成果条 */
    .stats-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    .stat-card {
      padding: 30px 20px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
    }
    .stat-number {
      font-size: 2.75rem;
      font-weight: 800;
      background: linear-gradient(90deg, #3B82F6, #06B6D4);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      line-height: 1.2;
      margin-bottom: 8px;
    }
    .stat-label {
      font-size: 15px;
      color: var(--text-main);
      font-weight: 600;
      margin-bottom: 4px;
    }
    .stat-desc {
      font-size: 13px;
      color: var(--text-dim);
    }

    /* 板块 10: 客户证言网格 */
    .testimonial-card {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-quote {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
      position: relative;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #fff;
    }
    .author-meta strong {
      display: block;
      font-size: 15px;
      color: #fff;
    }
    .author-meta span {
      font-size: 12px;
      color: var(--text-dim);
    }

    /* 板块 11: 行业资讯 */
    .news-card {
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .news-img {
      height: 190px;
      overflow: hidden;
    }
    .news-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .news-card:hover .news-img img {
      transform: scale(1.06);
    }
    .news-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .news-date {
      font-size: 12px;
      color: var(--accent);
      margin-bottom: 8px;
    }
    .news-title {
      font-size: 17px;
      margin-bottom: 12px;
      color: #fff;
      line-height: 1.4;
    }
    .news-excerpt {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
      flex-grow: 1;
    }
    .news-link {
      font-size: 13px;
      color: var(--primary-light);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .news-link:hover {
      color: var(--accent);
    }

    /* 板块 12: FAQ 手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      max-width: 1100px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .faq-toggle {
      width: 100%;
      padding: 20px 24px;
      text-align: left;
      background: none;
      border: none;
      color: #fff;
      font-size: 16px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-family: inherit;
    }
    .faq-toggle i {
      color: var(--accent);
      transition: transform 0.3s ease;
    }
    .faq-content {
      padding: 0 24px 20px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      display: none;
    }
    .faq-item.active .faq-content {
      display: block;
    }
    .faq-item.active .faq-toggle i {
      transform: rotate(180deg);
    }

    /* 板块 13: 转化收口区 */
    .cta-wrapper {
      background: radial-gradient(circle at center, rgba(37, 99, 235, 0.35) 0%, rgba(10, 18, 38, 0.95) 70%);
      border: 1px solid rgba(6, 182, 212, 0.3);
      border-radius: var(--radius-lg);
      padding: 60px 40px;
      text-align: center;
      max-width: 1000px;
      margin: 0 auto;
      box-shadow: 0 0 50px rgba(37, 99, 235, 0.2);
    }
    .cta-wrapper h2 {
      font-size: 2.4rem;
      margin-bottom: 16px;
      color: #fff;
    }
    .cta-wrapper p {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 680px;
      margin-left: auto;
      margin-right: auto;
    }
    .cta-form {
      display: flex;
      justify-content: center;
      gap: 12px;
      max-width: 580px;
      margin: 0 auto 20px auto;
    }
    .cta-input {
      flex: 1;
      padding: 14px 20px;
      background: rgba(15, 23, 42, 0.85);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      color: #fff;
      font-size: 15px;
      outline: none;
      transition: border-color 0.3s ease;
    }
    .cta-input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 15px var(--accent-glow);
    }
    .cta-tip {
      font-size: 13px;
      color: var(--text-dim);
    }

    /* 全站页脚 */
    .site-footer {
      background: #030712;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 70px 0 30px 0;
      font-size: 14px;
      color: var(--text-dim);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand h4 {
      font-size: 20px;
      color: #fff;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 20px;
      color: var(--text-muted);
    }
    .footer-col h5 {
      font-size: 16px;
      color: #fff;
      margin-bottom: 18px;
      position: relative;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col ul li a:hover {
      color: var(--accent);
    }
    .footer-contact-info p {
      margin-bottom: 8px;
      display: flex;
      align-items: flex-start;
      gap: 10px;
      color: var(--text-muted);
    }
    .footer-contact-info i {
      color: var(--accent);
      margin-top: 4px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 30px;
      text-align: center;
      font-size: 13px;
    }

    /* 移动端菜单按钮与响应式 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 24px;
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .grid-4, .workflow-track, .stats-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .split-layout, .case-grid {
        grid-template-columns: 1fr;
        gap: 30px;
      }
      .workflow-track::before {
        display: none;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .site-header {
        height: 64px;
      }
      .mobile-menu-btn {
        display: block;
      }
      .main-nav {
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        background: rgba(6, 11, 24, 0.98);
        flex-direction: column;
        padding: 24px;
        gap: 18px;
        border-bottom: 1px solid var(--border-color);
        display: none;
      }
      .main-nav.active {
        display: flex;
      }
      .nav-cta {
        display: none;
      }
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-stage img {
        height: 260px;
      }
      .grid-4, .grid-3, .stats-bar, .faq-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .cta-form {
        flex-direction: column;
      }
      .cta-input, .cta-form .btn {
        width: 100%;
      }
      .section {
        padding: 60px 0;
      }
      .case-container {
        padding: 24px;
      }
    }