/* roulang page: index */
:root {
      --primary: #1E2229;
      --primary-dark: #121417;
      --accent: #E65100;
      --accent-hover: #BF360C;
      --bg-light: #F4F5F7;
      --bg-white: #FFFFFF;
      --text-main: #1F2937;
      --text-muted: #606770;
      --border: #E5E7EB;
      --border-dark: #2A2F38;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 20px -4px rgba(0,0,0,0.08);
      --shadow-lg: 0 16px 32px -8px rgba(0,0,0,0.14);
      --radius-sm: 4px;
      --radius-md: 8px;
      --container-max: 1240px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Lantinghei SC", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-white);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, select, textarea {
      font: inherit;
    }

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

    /* 顶部双行导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border);
    }

    .top-bar {
      background: var(--primary-dark);
      color: #9CA3AF;
      font-size: 13px;
      padding: 6px 0;
      border-bottom: 1px solid var(--border-dark);
    }

    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .top-bar-links a {
      color: #D1D5DB;
      margin-left: 18px;
    }

    .top-bar-links a:hover {
      color: #FFF;
    }

    .main-bar {
      padding: 14px 0;
    }

    .main-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

    .brand-logo span.badge-tool {
      background: var(--accent);
      color: #FFF;
      font-size: 11px;
      padding: 2px 6px;
      border-radius: var(--radius-sm);
      text-transform: uppercase;
      font-weight: 700;
    }

    .nav-menu {
      display: flex;
      list-style: none;
      gap: 28px;
      align-items: center;
    }

    .nav-item a {
      font-size: 15px;
      font-weight: 600;
      color: #374151;
      position: relative;
      padding: 6px 0;
    }

    .nav-item a:hover {
      color: var(--accent);
    }

    .nav-cta {
      background: var(--accent);
      color: #FFF !important;
      padding: 9px 20px !important;
      border-radius: var(--radius-sm);
      font-weight: 700;
      box-shadow: 0 2px 6px rgba(230, 81, 0, 0.25);
      transition: background 0.2s, transform 0.1s;
    }

    .nav-cta:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      border: 1px solid transparent;
      font-size: 15px;
    }

    .btn:active {
      transform: scale(0.98);
    }

    .btn-primary {
      background: var(--accent);
      color: #FFF;
      box-shadow: 0 4px 14px rgba(230, 81, 0, 0.3);
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 6px 20px rgba(230, 81, 0, 0.4);
    }

    .btn-outline {
      background: transparent;
      border-color: #D1D5DB;
      color: var(--primary);
    }

    .btn-outline:hover {
      background: #F3F4F6;
      border-color: var(--primary);
    }

    .btn-white {
      background: #FFF;
      color: var(--primary);
      border: 1px solid #FFF;
    }

    .btn-white:hover {
      background: #F4F5F7;
    }

    /* 版块排版 */
    .section-spacing {
      padding: 88px 0;
    }

    .bg-light-tint {
      background-color: var(--bg-light);
    }

    .bg-dark-titanium {
      background-color: var(--primary-dark);
      color: #E2E8F0;
    }

    .section-header {
      margin-bottom: 48px;
    }

    .section-header.text-center {
      text-align: center;
    }

    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      color: var(--accent);
      background: rgba(230, 81, 0, 0.08);
      padding: 4px 12px;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.25;
      letter-spacing: -0.02em;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 780px;
      line-height: 1.7;
    }

    .section-desc.center {
      margin-left: auto;
      margin-right: auto;
    }

    /* Hero */
    .hero-panel {
      position: relative;
      background: linear-gradient(rgba(18, 20, 23, 0.88), rgba(30, 34, 41, 0.92)), url('/assets/images/baa76e5ca6b4291c.webp') center/cover no-repeat;
      color: #FFF;
      padding: 96px 0 112px;
      border-bottom: 4px solid var(--accent);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 56px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 46px;
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }

    .hero-content p {
      font-size: 17px;
      line-height: 1.8;
      color: #D1D5DB;
      margin-bottom: 32px;
    }

    .hero-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 32px;
    }

    .hero-badge-pill {
      background: rgba(255, 255, 255, 0.12);
      border: 1px solid rgba(255, 255, 255, 0.2);
      padding: 6px 14px;
      border-radius: 4px;
      font-size: 13px;
      color: #F3F4F6;
      font-weight: 600;
    }

    .hero-card {
      background: rgba(30, 34, 41, 0.85);
      border: 1px solid var(--border-dark);
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }

    .hero-card-title {
      font-size: 20px;
      font-weight: 700;
      color: #FFF;
      margin-bottom: 12px;
      border-left: 3px solid var(--accent);
      padding-left: 10px;
    }

    .hero-card-list {
      list-style: none;
      margin-top: 16px;
    }

    .hero-card-list li {
      font-size: 14px;
      color: #9CA3AF;
      padding: 10px 0;
      border-bottom: 1px solid rgba(255,255,255,0.06);
      display: flex;
      justify-content: space-between;
    }

    .hero-card-list li strong {
      color: #F9FAFB;
    }

    /* 痛点对比网格 */
    .painpoint-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
    }

    .painpoint-col {
      background: #FFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .painpoint-col.solution {
      background: #FFF9F5;
      border-color: #FED7AA;
    }

    .col-title {
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .col-title.bad { color: #DC2626; }
    .col-title.good { color: var(--accent); }

    .check-list {
      list-style: none;
    }

    .check-list li {
      position: relative;
      padding-left: 28px;
      margin-bottom: 16px;
      font-size: 15px;
      line-height: 1.6;
      color: #4B5563;
    }

    .check-list li::before {
      content: "✕";
      position: absolute;
      left: 0;
      top: 0;
      color: #DC2626;
      font-weight: 800;
    }

    .check-list.good-list li::before {
      content: "✓";
      color: #16A34A;
    }

    /* 六宫格卡片 */
    .grid-six {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: #FFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      position: relative;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #D1D5DB;
    }

    .feature-idx {
      font-size: 18px;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 12px;
      font-family: monospace;
    }

    .feature-card h3 {
      font-size: 19px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 10px;
    }

    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 三列产品大卡片 */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .product-card {
      background: #FFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
    }

    .product-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
    }

    .product-img-wrap {
      height: 240px;
      background: #E5E7EB;
      overflow: hidden;
      position: relative;
    }

    .product-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .product-card:hover .product-img-wrap img {
      transform: scale(1.04);
    }

    .product-body {
      padding: 28px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .product-model {
      font-size: 12px;
      font-weight: 700;
      color: var(--accent);
      text-transform: uppercase;
      margin-bottom: 6px;
    }

    .product-body h3 {
      font-size: 20px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 10px;
    }

    .product-desc {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 20px;
      flex: 1;
    }

    .product-specs {
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
      padding: 14px 0;
      margin-bottom: 20px;
    }

    .spec-row {
      display: flex;
      justify-content: space-between;
      font-size: 13px;
      padding: 4px 0;
    }

    .spec-label { color: #6B7280; }
    .spec-val { font-weight: 700; color: #111827; }

    /* 深色技术拆解 */
    .tech-panel {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .tech-info h2 {
      font-size: 32px;
      font-weight: 800;
      color: #FFF;
      line-height: 1.3;
      margin-bottom: 20px;
    }

    .tech-info p {
      color: #9CA3AF;
      font-size: 15px;
      line-height: 1.8;
      margin-bottom: 28px;
    }

    .tech-points {
      list-style: none;
    }

    .tech-points li {
      margin-bottom: 18px;
      background: rgba(255,255,255,0.04);
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      border-left: 3px solid var(--accent);
    }

    .tech-points h4 {
      color: #FFF;
      font-size: 16px;
      margin-bottom: 6px;
    }

    .tech-points p {
      color: #9CA3AF;
      font-size: 13px;
      margin-bottom: 0;
      line-height: 1.6;
    }

    /* 流程时间线 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .step-card {
      background: #FFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 28px 22px;
      position: relative;
    }

    .step-num {
      display: inline-block;
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #FFF;
      text-align: center;
      line-height: 36px;
      border-radius: 50%;
      font-weight: 800;
      font-size: 16px;
      margin-bottom: 16px;
    }

    .step-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 10px;
    }

    .step-card p {
      font-size: 13.5px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 案例展示 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .case-card {
      background: #FFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .case-img {
      height: 200px;
      background: #DDD;
      overflow: hidden;
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .case-body {
      padding: 24px;
    }

    .case-tag {
      font-size: 12px;
      color: var(--accent);
      font-weight: 700;
      margin-bottom: 6px;
    }

    .case-body h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }

    .case-body p {
      font-size: 13.5px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 14px;
    }

    .case-meta {
      display: flex;
      justify-content: space-between;
      border-top: 1px dashed var(--border);
      padding-top: 12px;
      font-size: 12px;
      color: #6B7280;
    }

    /* 数据指标条 */
    .metrics-bar {
      background: var(--primary);
      color: #FFF;
      padding: 60px 0;
      border-top: 1px solid var(--border-dark);
      border-bottom: 1px solid var(--border-dark);
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .metric-item .val {
      font-size: 44px;
      font-weight: 900;
      color: #FFF;
      line-height: 1.1;
      margin-bottom: 8px;
      letter-spacing: -0.02em;
    }

    .metric-item .val span {
      color: var(--accent);
      font-size: 28px;
      font-weight: 700;
    }

    .metric-item .lbl {
      font-size: 14px;
      color: #9CA3AF;
      font-weight: 600;
    }

    /* 客户证言卡片 */
    .testi-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .testi-card {
      background: #FFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }

    .testi-quote {
      font-size: 14.5px;
      color: #374151;
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: normal;
    }

    .testi-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      background: #E5E7EB;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: var(--primary);
      font-size: 14px;
    }

    .user-info h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--primary);
    }

    .user-info p {
      font-size: 12px;
      color: #6B7280;
    }

    /* 资讯工艺指南 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .news-card {
      background: #FFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
    }

    .news-date {
      font-size: 12px;
      color: #9CA3AF;
      margin-bottom: 8px;
    }

    .news-card h3 {
      font-size: 17px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.4;
      margin-bottom: 10px;
    }

    .news-card p {
      font-size: 13.5px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex: 1;
    }

    .news-card a {
      font-size: 13px;
      font-weight: 700;
      color: var(--accent);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
    }

    .faq-question {
      font-size: 17px;
      font-weight: 700;
      color: var(--primary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-toggle {
      font-size: 20px;
      font-weight: 400;
      color: var(--accent);
      transition: transform 0.25s;
    }

    .faq-item.active .faq-toggle {
      transform: rotate(45deg);
    }

    .faq-answer {
      font-size: 14.5px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-top: 12px;
      display: none;
    }

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

    /* CTA 登记区 */
    .cta-wrapper {
      background: linear-gradient(135deg, var(--primary) 0%, #111418 100%);
      color: #FFF;
      border-radius: var(--radius-md);
      padding: 60px 48px;
      box-shadow: var(--shadow-lg);
    }

    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .cta-info h2 {
      font-size: 32px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .cta-info p {
      font-size: 15px;
      color: #D1D5DB;
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .cta-form {
      display: flex;
      flex-direction: column;
      gap: 14px;
      background: rgba(255,255,255,0.05);
      padding: 28px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255,255,255,0.1);
    }

    .form-group input, .form-group select {
      width: 100%;
      padding: 12px 14px;
      background: #FFF;
      border: 1px solid #D1D5DB;
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--text-main);
    }

    .form-group input:focus, .form-group select:focus {
      outline: none;
      border-color: var(--accent);
    }

    /* 全局页脚 */
    .site-footer {
      background: #111418;
      color: #9CA3AF;
      font-size: 14px;
      padding-top: 70px;
      padding-bottom: 30px;
      border-top: 1px solid var(--border-dark);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 50px;
    }

    .footer-logo {
      font-size: 20px;
      font-weight: 800;
      color: #FFF;
      margin-bottom: 16px;
      display: inline-block;
    }

    .footer-intro {
      line-height: 1.7;
      margin-bottom: 20px;
      color: #8C94A0;
      font-size: 13.5px;
    }

    .footer-title {
      font-size: 15px;
      font-weight: 700;
      color: #FFF;
      margin-bottom: 18px;
      border-left: 2px solid var(--accent);
      padding-left: 8px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a {
      color: #9CA3AF;
      font-size: 13.5px;
    }

    .footer-links a:hover {
      color: #FFF;
    }

    .footer-contact p {
      font-size: 13.5px;
      color: #9CA3AF;
      margin-bottom: 10px;
      line-height: 1.6;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding-top: 24px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: #6B7280;
    }

    .footer-bottom a {
      color: #6B7280;
    }

    .footer-bottom a:hover {
      color: #9CA3AF;
    }

    /* 移动端汉堡按钮 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--primary);
    }

    /* 响应式媒体查询 */
    @media (max-width: 1024px) {
      .grid-six { grid-template-columns: repeat(2, 1fr); }
      .steps-grid { grid-template-columns: repeat(2, 1fr); }
      .hero-grid { grid-template-columns: 1fr; gap: 40px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .top-bar { display: none; }
      .mobile-menu-btn { display: block; }
      .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #FFF;
        flex-direction: column;
        gap: 0;
        border-bottom: 1px solid var(--border);
        display: none;
        box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
      }
      .nav-menu.open { display: flex; }
      .nav-item {
        width: 100%;
        text-align: left;
        border-top: 1px solid #F3F4F6;
      }
      .nav-item a {
        display: block;
        padding: 14px 24px;
      }
      .nav-cta {
        margin: 12px 24px 20px;
        text-align: center;
      }
      .section-spacing { padding: 56px 0; }
      .hero-panel { padding: 56px 0 64px; }
      .hero-content h1 { font-size: 32px; }
      .painpoint-grid, .tech-panel, .cta-grid { grid-template-columns: 1fr; gap: 32px; }
      .grid-six, .product-grid, .case-grid, .testi-grid, .news-grid, .steps-grid, .metrics-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
      .section-title { font-size: 26px; }
    }