/* roulang page: index */
:root {
      --primary: hsl(215, 28%, 12%);
      --primary-light: hsl(215, 20%, 20%);
      --accent: hsl(160, 84%, 38%);
      --accent-hover: hsl(160, 84%, 32%);
      --warning: hsl(28, 95%, 52%);
      --bg-light: hsl(210, 20%, 98%);
      --bg-white: hsl(0, 0%, 100%);
      --bg-dark: hsl(220, 22%, 8%);
      --text-main: hsl(215, 25%, 15%);
      --text-muted: hsl(215, 15%, 46%);
      --text-light: hsl(210, 20%, 92%);
      --border-light: rgba(0, 0, 0, 0.08);
      --border-dark: rgba(255, 255, 255, 0.1);
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.08);
      --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.14);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition: all 0.25s ease;
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { text-decoration: none; color: inherit; transition: var(--transition); }
    button, input, textarea, select { font-family: inherit; }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部信息与导航 */
    .top-bar {
      background-color: var(--bg-dark);
      color: var(--text-muted);
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid var(--border-dark);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-badges span {
      margin-right: 18px;
      color: var(--text-light);
    }
    .top-badges i { color: var(--accent); margin-right: 6px; }

    .site-header {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      position: sticky;
      top: 0;
      z-index: 1000;
      border-bottom: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-box {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--accent), #0f766e);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      font-size: 18px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 6px 0;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--accent);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
    }
    .btn-primary {
      background-color: var(--accent);
      color: #fff;
    }
    .btn-primary:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
    }
    .btn-warning {
      background-color: var(--warning);
      color: #fff;
    }
    .btn-warning:hover {
      background-color: hsl(28, 95%, 45%);
      transform: translateY(-2px);
    }
    .btn-outline {
      background-color: transparent;
      border-color: var(--border-light);
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      background-color: rgba(0,0,0,0.02);
    }
    .btn-outline-white {
      background-color: rgba(255, 255, 255, 0.08);
      border-color: var(--border-dark);
      color: #fff;
    }
    .btn-outline-white:hover {
      background-color: #fff;
      color: var(--primary);
    }

    /* 移动端汉堡切换 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 通用板块样式 */
    .section {
      padding: 85px 0;
      position: relative;
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: var(--text-light);
    }
    .section-white {
      background-color: var(--bg-white);
    }
    .section-gray {
      background-color: var(--bg-light);
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-header.text-center {
      text-align: center;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 12px;
      background: rgba(16, 185, 129, 0.1);
      color: var(--accent);
      border: 1px solid rgba(16, 185, 129, 0.25);
      border-radius: 50px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }
    .section-dark .section-badge {
      background: rgba(16, 185, 129, 0.15);
      color: #34d399;
      border-color: rgba(52, 211, 153, 0.3);
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--primary);
      margin-bottom: 14px;
    }
    .section-dark .section-title {
      color: #fff;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .section-dark .section-desc {
      color: #94a3b8;
    }

    /* 1. Hero 旗舰首屏 */
    .hero-section {
      position: relative;
      background-color: var(--primary);
      color: #fff;
      padding: 90px 0 110px;
      overflow: hidden;
    }
    .hero-bg-media {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.18;
      filter: grayscale(40%);
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.15) 0%, transparent 50%),
                  linear-gradient(to right, rgba(15, 23, 42, 0.95) 40%, rgba(15, 23, 42, 0.7) 100%);
    }
    .hero-container {
      position: relative;
      z-index: 2;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-content h1 span {
      color: var(--accent);
    }
    .hero-lead {
      font-size: 16px;
      line-height: 1.75;
      color: #cbd5e1;
      margin-bottom: 30px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
    }
    .hero-strip {
      background: rgba(255, 255, 255, 0.06);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 16px 20px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }
    .hero-strip-item {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .hero-strip-item i {
      font-size: 22px;
      color: var(--accent);
    }
    .hero-strip-text h4 {
      font-size: 14px;
      color: #fff;
    }
    .hero-strip-text p {
      font-size: 12px;
      color: #94a3b8;
    }
    .hero-showcase-box {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 20px;
      box-shadow: var(--shadow-lg);
    }
    .hero-showcase-box img {
      border-radius: var(--radius-md);
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .hero-spec-tag {
      margin-top: 14px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: #cbd5e1;
    }

    /* 2. 痛点解析网格 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      position: relative;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(239, 68, 68, 0.3);
    }
    .pain-card-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: rgba(239, 68, 68, 0.1);
      color: #ef4444;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 20px;
    }
    .pain-card h3 {
      font-size: 18px;
      margin-bottom: 12px;
      color: var(--primary);
    }
    .pain-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 3. 解决方案与硬核参数 */
    .solution-split {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .solution-media {
      position: relative;
    }
    .solution-media img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      width: 100%;
      height: 400px;
      object-fit: cover;
    }
    .solution-floating-badge {
      position: absolute;
      bottom: -20px;
      right: -20px;
      background: var(--primary);
      color: #fff;
      padding: 16px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-dark);
      box-shadow: var(--shadow-lg);
      max-width: 220px;
    }
    .solution-floating-badge strong {
      display: block;
      color: var(--accent);
      font-size: 20px;
      font-family: monospace;
    }
    .solution-list {
      list-style: none;
      margin: 24px 0;
    }
    .solution-list li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 15px;
      color: var(--text-main);
    }
    .solution-list li i {
      color: var(--accent);
      margin-top: 4px;
      font-size: 16px;
    }

    /* 4. 技术优势矩阵 */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .matrix-card {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 26px;
      transition: var(--transition);
    }
    .matrix-card:hover {
      border-color: var(--accent);
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }
    .matrix-card i {
      font-size: 24px;
      color: var(--accent);
      margin-bottom: 16px;
      display: inline-block;
    }
    .matrix-card h3 {
      font-size: 17px;
      margin-bottom: 10px;
      color: var(--primary);
    }
    .matrix-card p {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 5. 热门装备展示卡片 */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-card {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .product-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(16, 185, 129, 0.4);
    }
    .product-thumb {
      height: 220px;
      overflow: hidden;
      position: relative;
    }
    .product-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .product-card:hover .product-thumb img {
      transform: scale(1.05);
    }
    .product-pill {
      position: absolute;
      top: 14px;
      left: 14px;
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(4px);
      color: #fff;
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 4px;
      font-weight: 500;
    }
    .product-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .product-body h3 {
      font-size: 18px;
      color: var(--primary);
      margin-bottom: 10px;
    }
    .product-body p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 18px;
      line-height: 1.6;
    }
    .product-spec-table {
      margin-top: auto;
      background: var(--bg-light);
      border-radius: var(--radius-sm);
      padding: 12px;
      margin-bottom: 20px;
      font-size: 13px;
    }
    .product-spec-row {
      display: flex;
      justify-content: space-between;
      padding: 4px 0;
      border-bottom: 1px dashed rgba(0,0,0,0.06);
    }
    .product-spec-row:last-child {
      border-bottom: none;
    }
    .product-spec-label {
      color: var(--text-muted);
    }
    .product-spec-val {
      color: var(--primary);
      font-weight: 600;
      font-family: monospace;
    }

    /* 6. 高压作业哲学与研发理念 */
    .philosophy-banner {
      background: linear-gradient(135deg, hsl(220, 25%, 10%) 0%, hsl(215, 28%, 15%) 100%);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 48px;
    }
    .philosophy-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 36px;
    }
    .philo-item {
      border-left: 2px solid var(--accent);
      padding-left: 18px;
    }
    .philo-item h4 {
      color: #fff;
      font-size: 16px;
      margin-bottom: 8px;
    }
    .philo-item p {
      color: #94a3b8;
      font-size: 13px;
      line-height: 1.6;
    }

    /* 7. 四步标准作业流 */
    .flow-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .flow-step {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      position: relative;
    }
    .flow-num {
      font-size: 28px;
      font-weight: 900;
      color: rgba(16, 185, 129, 0.25);
      font-family: monospace;
      margin-bottom: 10px;
    }
    .flow-step h3 {
      font-size: 16px;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .flow-step p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 8. 适用人群画像与匹配 */
    .persona-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
    }
    .persona-card {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 32px;
    }
    .persona-card.match {
      border-top: 4px solid var(--accent);
    }
    .persona-card.mismatch {
      border-top: 4px solid #94a3b8;
      background: #fcfcfd;
    }
    .persona-tag {
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      padding: 4px 10px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 14px;
    }
    .persona-tag.fit {
      background: rgba(16, 185, 129, 0.1);
      color: var(--accent);
    }
    .persona-tag.unfit {
      background: rgba(148, 163, 184, 0.15);
      color: #64748b;
    }
    .persona-card h3 {
      font-size: 19px;
      margin-bottom: 12px;
      color: var(--primary);
    }
    .persona-card ul {
      list-style: none;
      margin-top: 16px;
    }
    .persona-card ul li {
      margin-bottom: 10px;
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--text-main);
    }
    .persona-card ul li i {
      font-size: 14px;
    }
    .persona-card.match ul li i { color: var(--accent); }
    .persona-card.mismatch ul li i { color: #94a3b8; }

    /* 9. 典型车企与网点案例 */
    .case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .case-card {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      overflow: hidden;
      display: flex;
      box-shadow: var(--shadow-sm);
    }
    .case-img {
      width: 42%;
      position: relative;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-info {
      width: 58%;
      padding: 28px 24px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .case-info h3 {
      font-size: 18px;
      color: var(--primary);
      margin-bottom: 10px;
    }
    .case-info p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 16px;
    }
    .case-data {
      display: flex;
      gap: 16px;
      padding-top: 12px;
      border-top: 1px solid var(--border-light);
    }
    .case-data-item strong {
      display: block;
      color: var(--accent);
      font-size: 18px;
      font-family: monospace;
    }
    .case-data-item span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 10. 量化数据指标条 */
    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-item {
      padding: 24px;
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
    }
    .metric-num {
      font-size: 36px;
      font-weight: 800;
      color: var(--accent);
      font-family: monospace;
      margin-bottom: 6px;
    }
    .metric-label {
      font-size: 14px;
      color: #94a3b8;
    }

    /* 11. 一线技师与主管口碑 */
    .testi-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testi-card {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
    }
    .testi-stars {
      color: #f59e0b;
      margin-bottom: 12px;
      font-size: 13px;
    }
    .testi-card p {
      font-size: 14px;
      color: var(--text-main);
      font-style: italic;
      margin-bottom: 18px;
      line-height: 1.6;
    }
    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .testi-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary-light);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
    }
    .testi-meta h4 {
      font-size: 14px;
      color: var(--primary);
    }
    .testi-meta span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 12. 行业资讯与技术指南 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .news-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }
    .news-thumb {
      height: 160px;
      overflow: hidden;
    }
    .news-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .news-body {
      padding: 20px;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .news-body h3 {
      font-size: 16px;
      color: var(--primary);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .news-body p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 13. FAQ 常见问题手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      font-size: 16px;
      color: var(--primary);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }
    .faq-question i {
      font-size: 14px;
      transition: transform 0.25s ease;
      color: var(--accent);
    }
    .faq-item.active .faq-question i {
      transform: rotate(180deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #fafbfc;
      border-top: 1px solid transparent;
    }
    .faq-item.active .faq-answer {
      border-color: var(--border-light);
    }
    .faq-answer-inner {
      padding: 20px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 14. 询盘与转化收口区 */
    .cta-panel {
      background: linear-gradient(135deg, hsl(215, 28%, 14%) 0%, hsl(220, 25%, 8%) 100%);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 48px;
      color: #fff;
    }
    .cta-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
    }
    .cta-form {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 28px;
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 13px;
      margin-bottom: 6px;
      color: #cbd5e1;
    }
    .form-control {
      width: 100%;
      padding: 10px 14px;
      background: rgba(15, 23, 42, 0.6);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-sm);
      color: #fff;
      font-size: 14px;
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
    }

    /* 页脚 */
    .site-footer {
      background-color: var(--bg-dark);
      color: #94a3b8;
      border-top: 1px solid var(--border-dark);
      padding: 60px 0 30px;
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand h4 {
      color: #fff;
      font-size: 20px;
      margin-bottom: 14px;
      font-weight: 800;
    }
    .footer-brand p {
      font-size: 13px;
      line-height: 1.7;
    }
    .footer-links h5 {
      color: #fff;
      font-size: 15px;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .footer-links ul {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    .footer-bottom {
      border-top: 1px solid var(--border-dark);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }

    /* 底部固定咨询条 (移动端优先强化) */
    .fixed-action-bar {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(15, 23, 42, 0.96);
      backdrop-filter: blur(8px);
      padding: 10px 16px;
      z-index: 999;
      border-top: 1px solid var(--border-dark);
      box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.15);
    }
    .fixed-action-bar .btn {
      width: 100%;
      padding: 10px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid, .solution-split, .cta-grid {
        grid-template-columns: 1fr;
      }
      .philosophy-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .matrix-grid, .product-grid, .news-grid, .testi-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .top-bar { display: none; }
      .menu-toggle { display: block; }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        display: none;
        border-bottom: 1px solid var(--border-light);
      }
      .nav-menu.open {
        display: flex;
      }
      .hero-content h1 {
        font-size: 30px;
      }
      .hero-strip {
        grid-template-columns: 1fr;
      }
      .pain-grid, .matrix-grid, .product-grid, .flow-grid, .persona-grid, .case-grid, .metrics-bar, .testi-grid, .news-grid {
        grid-template-columns: 1fr;
      }
      .case-card {
        flex-direction: column;
      }
      .case-img, .case-info {
        width: 100%;
      }
      .case-img {
        height: 200px;
      }
      .cta-panel {
        padding: 24px;
      }
      .fixed-action-bar {
        display: block;
      }
      body {
        padding-bottom: 60px;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }