/* roulang page: index */
:root {
      --primary: #0F52BA;
      --primary-hover: #0c4399;
      --accent: #10B981;
      --accent-hover: #059669;
      --dark: #0F172A;
      --dark-section: #090E17;
      --text-muted: #64748B;
      --text-light: #94A3B8;
      --bg-surface: #F8FAFC;
      --card-bg: #FFFFFF;
      --border-color: #E2E8F0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.06), 0 2px 4px -1px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 24px -8px rgba(15, 82, 186, 0.12);
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --font-mono: "DIN Alternate", "Roboto Mono", "Trebuchet MS", monospace, sans-serif;
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

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

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-surface);
      color: var(--dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

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

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

    /* 顶部双行导航 */
    .topbar {
      background-color: #F1F5F9;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.8125rem;
      color: var(--text-muted);
      padding: 8px 0;
    }

    .topbar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .topbar-links a {
      margin-left: 20px;
      color: var(--text-muted);
    }

    .topbar-links a:hover {
      color: var(--primary);
    }

    .main-nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background-color: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--dark);
      letter-spacing: -0.5px;
    }

    .brand-badge-icon {
      width: 34px;
      height: 34px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 1.1rem;
      font-weight: 900;
    }

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

    .nav-item a {
      font-weight: 600;
      font-size: 0.9375rem;
      color: var(--dark);
      position: relative;
      padding: 6px 0;
    }

    .nav-item a:hover,
    .nav-item.active a {
      color: var(--primary);
    }

    .nav-item a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--primary);
      transition: var(--transition);
    }

    .nav-item a:hover::after,
    .nav-item.active a::after {
      width: 100%;
    }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.9375rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
    }

    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 2px 4px rgba(15, 82, 186, 0.2);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(15, 82, 186, 0.3);
    }

    .btn-outline {
      border-color: var(--border-color);
      background-color: transparent;
      color: var(--dark);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    .btn-accent {
      background-color: var(--accent);
      color: #FFFFFF;
    }

    .btn-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--dark);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
      position: relative;
    }

    .section-header {
      margin-bottom: 50px;
    }

    .section-header.text-center {
      text-align: center;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      background-color: rgba(15, 82, 186, 0.08);
      padding: 4px 12px;
      border-radius: 50px;
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--dark);
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 板块 1: Hero Section */
    .hero-section {
      padding: 80px 0 100px;
      background: linear-gradient(180deg, #FFFFFF 0%, #F1F5F9 100%);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 50px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -1px;
      color: var(--dark);
      margin-bottom: 24px;
    }

    .hero-content h1 span {
      color: var(--primary);
    }

    .hero-content p {
      font-size: 1.125rem;
      line-height: 1.8;
      color: var(--text-muted);
      margin-bottom: 36px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .hero-spec-strip {
      margin-top: 40px;
      display: flex;
      gap: 24px;
      font-size: 0.875rem;
      color: var(--text-muted);
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
    }

    .hero-spec-item {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .hero-spec-item svg {
      width: 16px;
      height: 16px;
      fill: var(--accent);
    }

    .hero-visual {
      position: relative;
    }

    .hero-img-wrap {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 20px 40px -15px rgba(15, 23, 42, 0.15);
      border: 1px solid rgba(255, 255, 255, 0.8);
      position: relative;
    }

    .hero-console-badge {
      position: absolute;
      bottom: 20px;
      left: 20px;
      background: rgba(15, 23, 42, 0.88);
      backdrop-filter: blur(8px);
      color: #fff;
      padding: 12px 20px;
      border-radius: var(--radius-md);
      font-family: var(--font-mono);
      font-size: 0.8125rem;
      border: 1px solid rgba(255, 255, 255, 0.15);
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .status-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent);
    }

    /* 板块 2: 全域核心指标看板 */
    .metrics-section {
      background-color: #FFFFFF;
      padding: 60px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      padding: 24px;
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      transition: var(--transition);
    }

    .metric-card:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
    }

    .metric-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 12px;
    }

    .metric-label {
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    .metric-badge {
      font-size: 0.75rem;
      font-weight: 600;
      padding: 2px 8px;
      border-radius: 4px;
      background-color: #E2E8F0;
      color: var(--dark);
    }

    .metric-badge.green {
      background-color: #DCFCE7;
      color: #15803D;
    }

    .metric-value {
      font-family: var(--font-mono);
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--dark);
      line-height: 1;
      margin-bottom: 8px;
    }

    .metric-note {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* 板块 3: 架构与技术标准 */
    .arch-section {
      background-color: var(--bg-surface);
    }

    .arch-grid {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 50px;
      align-items: center;
    }

    .arch-img-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 16px;
      box-shadow: var(--shadow-md);
    }

    .arch-content h3 {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--dark);
    }

    .arch-list {
      list-style: none;
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .arch-list-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .arch-icon {
      flex-shrink: 0;
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background-color: rgba(15, 82, 186, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.875rem;
      font-weight: bold;
    }

    /* 板块 4: 核心支撑优势 6 卡片 */
    .advantages-section {
      background-color: #FFFFFF;
    }

    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .adv-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      transition: var(--transition);
      position: relative;
    }

    .adv-card:hover {
      background: #FFFFFF;
      border-color: var(--primary);
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .adv-icon-box {
      width: 44px;
      height: 44px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.25rem;
      margin-bottom: 20px;
    }

    .adv-card:hover .adv-icon-box {
      background: var(--primary);
      color: #FFFFFF;
      border-color: var(--primary);
    }

    .adv-card h4 {
      font-size: 1.1875rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--dark);
    }

    .adv-card p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 5: 硬件产品矩阵 3 卡片 */
    .hardware-section {
      background-color: var(--bg-surface);
    }

    .hardware-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .hw-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .hw-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .hw-img-wrap {
      height: 220px;
      overflow: hidden;
      background-color: #E2E8F0;
    }

    .hw-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

    .hw-card:hover .hw-img-wrap img {
      transform: scale(1.05);
    }

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

    .hw-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 12px;
    }

    .hw-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 16px;
    }

    .hw-tag {
      font-size: 0.75rem;
      padding: 3px 8px;
      background-color: #F1F5F9;
      border-radius: 4px;
      color: var(--text-muted);
      font-family: var(--font-mono);
    }

    .hw-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.6;
    }

    .hw-specs {
      margin-top: auto;
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
      font-size: 0.8125rem;
      color: var(--dark);
    }

    .hw-spec-row {
      display: flex;
      justify-content: space-between;
      margin-bottom: 6px;
    }

    .hw-spec-row span:first-child {
      color: var(--text-muted);
    }

    /* 板块 6: 深色案例与教改理念 */
    .dark-case-section {
      background-color: var(--dark-section);
      color: #FFFFFF;
      padding: 100px 0;
    }

    .dark-case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .quote-badge {
      font-size: 3rem;
      line-height: 1;
      color: var(--accent);
      font-family: serif;
      margin-bottom: 12px;
    }

    .dark-case-section .section-title {
      color: #FFFFFF;
    }

    .case-quote-p {
      font-size: 1.125rem;
      line-height: 1.8;
      color: var(--text-light);
      margin-bottom: 30px;
    }

    .case-author {
      font-weight: 700;
      font-size: 1rem;
      color: #FFFFFF;
    }

    .case-author span {
      display: block;
      font-size: 0.8125rem;
      color: var(--text-muted);
      font-weight: normal;
      margin-top: 4px;
    }

    .case-stats-panel {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-lg);
      padding: 40px;
      backdrop-filter: blur(10px);
    }

    .case-stat-item {
      margin-bottom: 28px;
    }

    .case-stat-item:last-child {
      margin-bottom: 0;
    }

    .case-stat-header {
      display: flex;
      justify-content: space-between;
      margin-bottom: 8px;
      font-size: 0.9375rem;
    }

    .case-progress-bar {
      height: 8px;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 4px;
      overflow: hidden;
    }

    .case-progress-fill {
      height: 100%;
      background: linear-gradient(90deg, var(--primary), var(--accent));
      border-radius: 4px;
    }

    /* 板块 7: 结果量化对比 (Before/After) */
    .comparison-section {
      background-color: #FFFFFF;
    }

    .comp-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
    }

    .comp-column {
      padding: 40px;
    }

    .comp-column.before {
      background-color: #FAFAFA;
      border-right: 1px solid var(--border-color);
    }

    .comp-column.after {
      background-color: #F8FAFC;
    }

    .comp-col-header {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .comp-item {
      margin-bottom: 24px;
      padding-bottom: 20px;
      border-bottom: 1px dashed var(--border-color);
    }

    .comp-item:last-child {
      margin-bottom: 0;
      padding-bottom: 0;
      border-bottom: none;
    }

    .comp-item-title {
      font-weight: 600;
      font-size: 1rem;
      margin-bottom: 6px;
      color: var(--dark);
    }

    .comp-item-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 8: 落地里程碑步骤 */
    .steps-section {
      background-color: var(--bg-surface);
    }

    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }

    .step-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      position: relative;
    }

    .step-number {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 800;
      color: rgba(15, 82, 186, 0.2);
      margin-bottom: 12px;
      line-height: 1;
    }

    .step-title {
      font-size: 1.125rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--dark);
    }

    .step-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .step-cycle {
      font-size: 0.75rem;
      color: var(--primary);
      font-weight: 600;
      background: rgba(15, 82, 186, 0.08);
      padding: 4px 10px;
      border-radius: 4px;
      display: inline-block;
    }

    /* 板块 9: 全宽数据统计条 */
    .full-stat-strip {
      background: linear-gradient(135deg, #0F52BA 0%, #093780 100%);
      color: #FFFFFF;
      padding: 60px 0;
    }

    .full-stat-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }

    .strip-stat-num {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 8px;
    }

    .strip-stat-title {
      font-size: 1rem;
      font-weight: 600;
      opacity: 0.95;
      margin-bottom: 4px;
    }

    .strip-stat-desc {
      font-size: 0.8125rem;
      opacity: 0.7;
    }

    /* 板块 10: 教师与管理者故事 */
    .stories-section {
      background-color: #FFFFFF;
    }

    .stories-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }

    .story-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      background-color: var(--bg-surface);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .story-quote {
      font-size: 1rem;
      line-height: 1.8;
      color: var(--dark);
      margin-bottom: 24px;
      position: relative;
    }

    .story-user {
      display: flex;
      align-items: center;
      gap: 16px;
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
    }

    .story-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background-color: var(--primary);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .story-meta h5 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--dark);
    }

    .story-meta p {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* 板块 11: 资讯与教研动态 */
    .news-section {
      background-color: var(--bg-surface);
    }

    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }

    .news-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }

    .news-img {
      height: 180px;
      overflow: hidden;
    }

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

    .news-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    .news-meta {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 12px;
      font-size: 0.75rem;
    }

    .news-badge {
      background-color: #EFF6FF;
      color: var(--primary);
      padding: 2px 8px;
      border-radius: 4px;
      font-weight: 600;
    }

    .news-date {
      color: var(--text-muted);
      font-family: var(--font-mono);
    }

    .news-title {
      font-size: 1.0625rem;
      font-weight: 700;
      margin-bottom: 10px;
      line-height: 1.4;
      color: var(--dark);
    }

    .news-summary {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    /* 板块 12: 常见疑问 FAQ */
    .faq-section {
      background-color: #FFFFFF;
    }

    .faq-wrap {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item.active {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 20px 24px;
      background: #FFFFFF;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      font-size: 1.0625rem;
      color: var(--dark);
    }

    .faq-toggle-icon {
      font-size: 1.25rem;
      color: var(--text-muted);
      transition: var(--transition);
    }

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

    .faq-answer {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
      background-color: #F8FAFC;
      color: var(--text-muted);
      font-size: 0.9375rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      padding: 16px 24px 24px;
      max-height: 500px;
    }

    /* 板块 13: 转化表单 */
    .cta-form-section {
      background: linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%);
      border-top: 1px solid var(--border-color);
      padding: 90px 0;
    }

    .cta-form-card {
      max-width: 800px;
      margin: 0 auto;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 48px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 24px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .form-group.full {
      grid-column: 1 / -1;
    }

    .form-group label {
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--dark);
    }

    .form-control {
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.9375rem;
      font-family: inherit;
      outline: none;
      transition: var(--transition);
      background-color: #FFFFFF;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(15, 82, 186, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .form-privacy-note {
      text-align: center;
      margin-top: 16px;
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    .form-privacy-note a {
      color: var(--primary);
      text-decoration: underline;
    }

    /* 页脚系统 */
    .site-footer {
      background-color: var(--dark-section);
      color: #94A3B8;
      font-size: 0.875rem;
      padding: 70px 0 30px;
      border-top: 1px solid #1E293B;
    }

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

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 30px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
      text-align: center;
      font-size: 0.8125rem;
      color: #64748B;
    }

    .footer-icp a {
      color: #64748B;
    }

    .footer-icp a:hover {
      color: #94A3B8;
    }

    /* 移动端抽屉与响应式适配 */
    @media (max-width: 1024px) {
      .hero-grid,
      .arch-grid,
      .dark-case-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .metrics-grid,
      .adv-grid,
      .hardware-grid,
      .steps-grid,
      .full-stat-grid,
      .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .comp-container {
        grid-template-columns: 1fr;
      }
      .comp-column.before {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
      }
    }

    @media (max-width: 768px) {
      .topbar {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        align-items: flex-start;
        padding: 24px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        display: none;
        gap: 18px;
        border-bottom: 1px solid var(--border-color);
      }
      .nav-menu.open {
        display: flex;
      }
      .nav-cta {
        display: none;
      }
      .hero-content h1 {
        font-size: 2.25rem;
      }
      .section-title {
        font-size: 1.75rem;
      }
      .metrics-grid,
      .adv-grid,
      .hardware-grid,
      .steps-grid,
      .full-stat-grid,
      .stories-grid,
      .news-grid {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .cta-form-card {
        padding: 28px 20px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
      }
    }