/* roulang page: index */
:root {
      --primary: #1D4ED8;
      --primary-dark: #0F172A;
      --primary-deep: #0B192C;
      --accent: #38BDF8;
      --accent-soft: #F0F7FF;
      --bg-light: #F8FAFC;
      --white: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --card-hover-shadow: 0 20px 25px -5px rgba(29, 78, 216, 0.12);
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --radius-xl: 16px;
      --section-spacing: clamp(4rem, 7vw, 6.5rem);
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--white);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* Top Utility Bar */
    .top-bar {
      background-color: #EDF4FE;
      border-bottom: 1px solid #DFEBF9;
      font-size: 0.85rem;
      color: #475569;
      padding: 0.45rem 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 0.75rem;
    }
    .top-bar-tags {
      display: flex;
      gap: 1rem;
      align-items: center;
    }
    .badge-tag {
      background: #DBEAFE;
      color: #1E40AF;
      padding: 0.15rem 0.5rem;
      border-radius: var(--radius-sm);
      font-weight: 500;
      font-size: 0.75rem;
    }

    /* Main Sticky Nav */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: -0.02em;
    }
    .brand-logo-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: #fff;
      border-radius: var(--radius-md);
      display: grid;
      place-items: center;
      font-size: 1.1rem;
      font-weight: 800;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2rem;
      list-style: none;
    }
    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: #334155;
      padding: 0.5rem 0;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .nav-link:hover::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    .nav-cta {
      background: var(--primary);
      color: #fff;
      padding: 0.65rem 1.4rem;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 0.9rem;
      transition: all 0.3s ease;
      display: inline-block;
      box-shadow: 0 4px 12px rgba(29, 78, 216, 0.25);
    }
    .nav-cta:hover {
      background: #153EBA;
      transform: translateY(-1px);
    }

    /* Section Typography */
    .section-header {
      margin-bottom: 3.5rem;
    }
    .section-header.text-center {
      text-align: center;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }
    .section-pill {
      display: inline-block;
      background: var(--accent-soft);
      color: var(--primary);
      font-size: 0.8rem;
      font-weight: 600;
      padding: 0.3rem 0.85rem;
      border-radius: 9999px;
      border: 1px solid #BFDBFE;
      margin-bottom: 0.85rem;
    }
    .section-title {
      font-size: clamp(1.8rem, 3.2vw, 2.4rem);
      font-weight: 700;
      color: var(--primary-dark);
      line-height: 1.3;
      margin-bottom: 1rem;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Common Card Styles */
    .app-card {
      background: var(--white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--card-shadow);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .app-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: #93C5FD;
    }

    /* Hero Section (Short Video Vertical Card Layout) */
    .hero-section {
      padding: clamp(3rem, 6vw, 5rem) 0;
      background: linear-gradient(180deg, #F0F7FF 0%, #FFFFFF 100%);
      position: relative;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 3.5rem;
      align-items: center;
    }
    .hero-title {
      font-size: clamp(2.2rem, 4vw, 3.2rem);
      font-weight: 800;
      color: var(--primary-dark);
      line-height: 1.25;
      margin-bottom: 1.25rem;
    }
    .hero-title span {
      background: linear-gradient(135deg, var(--primary), #0284C7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-intro {
      font-size: 1.1rem;
      color: #475569;
      line-height: 1.8;
      margin-bottom: 2rem;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      margin-bottom: 2.5rem;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      padding: 0.9rem 1.8rem;
      border-radius: var(--radius-md);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      box-shadow: 0 4px 14px rgba(29, 78, 216, 0.3);
      transition: all 0.2s;
    }
    .btn-primary:hover {
      background: #153EBA;
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: #fff;
      color: var(--primary-dark);
      border: 1px solid var(--border-color);
      padding: 0.9rem 1.8rem;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: all 0.2s;
    }
    .btn-secondary:hover {
      background: var(--accent-soft);
      border-color: #93C5FD;
    }
    .hero-capsules {
      display: flex;
      gap: 1.5rem;
      border-top: 1px solid #E2E8F0;
      padding-top: 1.5rem;
    }
    .capsule-item {
      display: flex;
      flex-direction: column;
    }
    .capsule-num {
      font-size: 1.3rem;
      font-weight: 700;
      color: var(--primary-dark);
    }
    .capsule-lbl {
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    
    /* Vertical Card Stage */
    .vertical-showcase {
      position: relative;
      background: var(--primary-dark);
      border-radius: 24px;
      padding: 1rem;
      box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.35);
      border: 4px solid #334155;
    }
    .vertical-media {
      position: relative;
      border-radius: 16px;
      overflow: hidden;
      aspect-ratio: 9/14;
      background: #1e293b;
    }
    .vertical-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .vertical-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      padding: 1.5rem;
      background: linear-gradient(180deg, transparent 0%, rgba(11, 25, 44, 0.95) 100%);
      color: #fff;
    }
    .overlay-badge {
      display: inline-block;
      background: rgba(56, 189, 248, 0.2);
      border: 1px solid #38BDF8;
      color: #38BDF8;
      font-size: 0.75rem;
      padding: 0.2rem 0.6rem;
      border-radius: 4px;
      margin-bottom: 0.5rem;
    }
    .vertical-overlay h4 {
      font-size: 1.15rem;
      margin-bottom: 0.4rem;
    }
    .vertical-overlay p {
      font-size: 0.85rem;
      color: #CBD5E1;
      margin-bottom: 1rem;
    }

    /* Section 2: 产线能力 (Production Lines) */
    .section-pipeline {
      padding: var(--section-spacing) 0;
      background: var(--white);
    }
    .pipeline-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .pipeline-card {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 2.2rem 1.8rem;
      position: relative;
      transition: all 0.3s;
    }
    .pipeline-card:hover {
      background: #fff;
      box-shadow: var(--card-hover-shadow);
      border-color: #93C5FD;
      transform: translateY(-4px);
    }
    .pipeline-icon {
      width: 52px;
      height: 52px;
      background: #DBEAFE;
      color: var(--primary);
      border-radius: 10px;
      display: grid;
      place-items: center;
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 1.4rem;
    }
    .pipeline-card h3 {
      font-size: 1.25rem;
      margin-bottom: 0.8rem;
      color: var(--primary-dark);
    }
    .pipeline-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Section 3: 研发参数表 (Param Table & Metrics) */
    .section-params {
      padding: var(--section-spacing) 0;
      background: #F8FAFC;
    }
    .param-table-box {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }
    .param-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .param-table th, .param-table td {
      padding: 1.2rem 1.5rem;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }
    .param-table th {
      background: #F1F5F9;
      color: var(--primary-dark);
      font-weight: 600;
    }
    .param-table tr:last-child td {
      border-bottom: none;
    }
    .param-table tr:hover td {
      background: #F8FAFC;
    }
    .status-ok {
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
      color: #059669;
      font-weight: 600;
      font-size: 0.85rem;
    }

    /* Section 4: 架构与技术底座 (Dark Matrix) */
    .section-tech-dark {
      padding: var(--section-spacing) 0;
      background: var(--primary-deep);
      color: #fff;
    }
    .tech-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }
    .tech-card {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 1.8rem 1.4rem;
      backdrop-filter: blur(8px);
      transition: all 0.3s;
    }
    .tech-card:hover {
      background: rgba(255, 255, 255, 0.08);
      border-color: var(--accent);
      transform: translateY(-4px);
    }
    .tech-code {
      font-family: monospace;
      font-size: 0.8rem;
      color: var(--accent);
      margin-bottom: 0.6rem;
      display: block;
    }
    .tech-card h4 {
      font-size: 1.15rem;
      margin-bottom: 0.75rem;
      color: #F8FAFC;
    }
    .tech-card p {
      font-size: 0.88rem;
      color: #94A3B8;
      line-height: 1.6;
    }

    /* Section 5: 核心研发优势 (Advantages 6-grid) */
    .section-advantages {
      padding: var(--section-spacing) 0;
      background: #fff;
    }
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .adv-card {
      background: var(--white);
      border: 1px solid #E2E8F0;
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--card-shadow);
      transition: all 0.3s;
    }
    .adv-card:hover {
      box-shadow: var(--card-hover-shadow);
      border-color: #93C5FD;
      transform: translateY(-4px);
    }
    .adv-icon-badge {
      width: 46px;
      height: 46px;
      background: linear-gradient(135deg, #EFF6FF, #DBEAFE);
      border-radius: 8px;
      display: grid;
      place-items: center;
      color: var(--primary);
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 1.2rem;
    }
    .adv-card h3 {
      font-size: 1.2rem;
      color: var(--primary-dark);
      margin-bottom: 0.75rem;
    }
    .adv-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Section 6: 案例现场 (Cases Story) */
    .section-cases {
      padding: var(--section-spacing) 0;
      background: var(--bg-light);
    }
    .case-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-xl);
      overflow: hidden;
      margin-bottom: 2.5rem;
      box-shadow: var(--card-shadow);
    }
    .case-row:nth-child(even) {
      direction: rtl;
    }
    .case-row:nth-child(even) .case-content {
      direction: ltr;
    }
    .case-thumb {
      height: 100%;
      min-height: 320px;
    }
    .case-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-content {
      padding: 2.5rem;
    }
    .case-tag {
      color: var(--primary);
      font-weight: 600;
      font-size: 0.85rem;
      margin-bottom: 0.5rem;
    }
    .case-title {
      font-size: 1.5rem;
      color: var(--primary-dark);
      margin-bottom: 1rem;
    }
    .case-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 1.5rem;
    }
    .case-kpi {
      display: flex;
      gap: 2rem;
      border-top: 1px solid #F1F5F9;
      padding-top: 1rem;
    }
    .kpi-val {
      font-size: 1.3rem;
      font-weight: 700;
      color: var(--primary);
    }
    .kpi-lbl {
      font-size: 0.8rem;
      color: #64748B;
    }

    /* Section 7: 交付流程 (Delivery Process) */
    .section-process {
      padding: var(--section-spacing) 0;
      background: #fff;
    }
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
      position: relative;
    }
    .process-step {
      background: #F8FAFC;
      border: 1px solid #E2E8F0;
      border-radius: var(--radius-lg);
      padding: 2rem 1.5rem;
      position: relative;
    }
    .step-badge {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #fff;
      border-radius: 50%;
      display: grid;
      place-items: center;
      font-weight: 700;
      font-size: 0.95rem;
      margin-bottom: 1rem;
    }
    .process-step h4 {
      font-size: 1.15rem;
      color: var(--primary-dark);
      margin-bottom: 0.6rem;
    }
    .process-step p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Section 8: 研发效能统计带 (Metric Bar) */
    .section-metrics {
      padding: 3.5rem 0;
      background: linear-gradient(90deg, #1E40AF 0%, #1D4ED8 100%);
      color: #fff;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .metric-value {
      font-size: clamp(2rem, 3.5vw, 3rem);
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 0.35rem;
      font-feature-settings: "tnum";
    }
    .metric-label {
      font-size: 0.95rem;
      color: #BFDBFE;
      font-weight: 500;
    }

    /* Section 9: 评价信赖 (Reviews) */
    .section-reviews {
      padding: var(--section-spacing) 0;
      background: #F8FAFC;
    }
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .review-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 2rem;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--card-shadow);
    }
    .review-quote {
      font-size: 0.95rem;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 1.5rem;
      font-style: italic;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 0.85rem;
      border-top: 1px solid #F1F5F9;
      padding-top: 1rem;
    }
    .reviewer-avatar {
      width: 44px;
      height: 44px;
      background: #E2E8F0;
      border-radius: 50%;
      display: grid;
      place-items: center;
      font-weight: 700;
      color: #475569;
    }
    .reviewer-name {
      font-weight: 600;
      font-size: 0.95rem;
      color: var(--primary-dark);
    }
    .reviewer-corp {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* Section 10: 行业前沿资讯 (News Stream) */
    .section-news {
      padding: var(--section-spacing) 0;
      background: #fff;
    }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .news-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: all 0.3s;
    }
    .news-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }
    .news-img {
      height: 200px;
      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(1.05);
    }
    .news-body {
      padding: 1.6rem;
    }
    .news-date {
      font-size: 0.8rem;
      color: #94A3B8;
      margin-bottom: 0.5rem;
    }
    .news-card h4 {
      font-size: 1.15rem;
      margin-bottom: 0.75rem;
      color: var(--primary-dark);
      line-height: 1.4;
    }
    .news-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Section 11: 合作伙伴 (Partners) */
    .section-partners {
      padding: 3.5rem 0;
      background: #F8FAFC;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .partner-logos {
      display: flex;
      justify-content: space-around;
      align-items: center;
      flex-wrap: wrap;
      gap: 2rem;
      opacity: 0.75;
    }
    .partner-item {
      font-size: 1.1rem;
      font-weight: 700;
      color: #64748B;
      letter-spacing: 0.05em;
      border: 1px dashed #CBD5E1;
      padding: 0.75rem 1.8rem;
      border-radius: var(--radius-sm);
      background: #fff;
    }

    /* Section 12: 询盘与业务对接 (Contact CTA) */
    .section-contact {
      padding: var(--section-spacing) 0;
      background: #fff;
    }
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 3.5rem;
      align-items: start;
    }
    .contact-info-card {
      background: linear-gradient(145deg, #0B192C, #1E293B);
      color: #fff;
      padding: 2.5rem;
      border-radius: var(--radius-xl);
    }
    .contact-info-card h3 {
      font-size: 1.6rem;
      margin-bottom: 1rem;
    }
    .contact-info-card p {
      font-size: 0.95rem;
      color: #CBD5E1;
      line-height: 1.7;
      margin-bottom: 2rem;
    }
    .contact-item-row {
      display: flex;
      align-items: center;
      gap: 1rem;
      margin-bottom: 1.2rem;
      font-size: 0.95rem;
      color: #F8FAFC;
    }
    .form-panel {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-xl);
      padding: 2.5rem;
      box-shadow: var(--card-shadow);
    }
    .form-group {
      margin-bottom: 1.25rem;
    }
    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 0.4rem;
      color: var(--primary-dark);
    }
    .form-control {
      width: 100%;
      padding: 0.75rem 1rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.1);
    }
    .form-submit-btn {
      width: 100%;
      background: var(--primary);
      color: #fff;
      border: none;
      padding: 0.9rem;
      border-radius: var(--radius-md);
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s;
    }
    .form-submit-btn:hover {
      background: #153EBA;
    }

    /* Footer */
    .site-footer {
      background: #0B192C;
      color: #94A3B8;
      padding: 4.5rem 0 2rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.9rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 3rem;
      margin-bottom: 3.5rem;
    }
    .footer-brand {
      font-size: 1.25rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 1rem;
    }
    .footer-title {
      font-size: 1rem;
      font-weight: 600;
      color: #fff;
      margin-bottom: 1.2rem;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 0.65rem;
    }
    .footer-links a:hover {
      color: #fff;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 1.8rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
      font-size: 0.85rem;
    }

    /* Responsive Breakpoints */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .pipeline-grid, .adv-grid, .news-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .tech-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .nav-menu {
        display: none;
      }
      .case-row {
        grid-template-columns: 1fr;
      }
      .case-row:nth-child(even) {
        direction: ltr;
      }
      .pipeline-grid, .adv-grid, .news-grid, .reviews-grid, .tech-grid, .process-timeline, .metrics-grid {
        grid-template-columns: 1fr;
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }