/* roulang page: index */
:root {
      --primary: #1E3A8A;
      --primary-light: #2563EB;
      --primary-dark: #172554;
      --accent: #D97706;
      --accent-hover: #B45309;
      --bg-main: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0F172A;
      --bg-dark-card: #1E293B;
      --text-title: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 15px -3px rgba(15, 23, 42, 0.06), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
      --shadow-lg: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --transition: all 0.28s ease-in-out;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      line-height: 1.75;
      color: var(--text-body);
      background-color: var(--bg-main);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    ul, ol {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部微型信息条 */
    .top-bar {
      background-color: #F1F5F9;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.825rem;
      color: var(--text-muted);
      padding: 7px 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 10px;
    }
    .top-bar-info span {
      margin-right: 18px;
    }

    /* 主导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      box-shadow: var(--shadow-sm);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.45rem;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .brand-logo .logo-badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: #fff;
      border-radius: var(--radius-sm);
      font-size: 1.15rem;
    }
    .brand-logo span.sub {
      font-size: 0.8rem;
      font-weight: 500;
      color: var(--accent);
      margin-left: 4px;
      background: #FEF3C7;
      padding: 2px 7px;
      border-radius: 4px;
    }

    .main-nav {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-link {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-title);
      position: relative;
      padding: 6px 0;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary-light);
    }
    .nav-link.active::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary-light);
      border-radius: 2px;
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    /* 移动端菜单控制按钮 */
    .menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      font-size: 1.1rem;
      color: var(--text-title);
    }

    /* 按钮通用体系 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      font-weight: 600;
      padding: 11px 22px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #fff;
    }
    .btn-primary:hover {
      background-color: var(--primary-light);
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.28);
      transform: translateY(-2px);
    }
    .btn-accent {
      background-color: var(--accent);
      color: #fff;
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      box-shadow: 0 4px 12px rgba(217, 119, 6, 0.28);
      transform: translateY(-2px);
    }
    .btn-outline {
      border-color: var(--border-color);
      color: var(--text-title);
      background-color: #fff;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: #EFF6FF;
    }
    .btn-sm {
      padding: 8px 16px;
      font-size: 0.85rem;
    }

    /* Section 通用规范 */
    .section-wrap {
      padding: 85px 0;
      position: relative;
    }
    .section-bg-white {
      background-color: var(--bg-white);
    }
    .section-bg-light {
      background-color: #F8FAFC;
    }
    .section-bg-slate {
      background-color: #F1F5F9;
    }
    .section-bg-dark {
      background-color: var(--bg-dark);
      color: #F8FAFC;
    }

    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 50px auto;
    }
    .section-header.text-left {
      text-align: left;
      margin-left: 0;
      margin-right: 0;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.825rem;
      font-weight: 700;
      color: var(--primary-light);
      background-color: #EFF6FF;
      border: 1px solid #DBEAFE;
      padding: 4px 14px;
      border-radius: 50px;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }
    .section-bg-dark .section-tag {
      background-color: rgba(37, 99, 235, 0.2);
      border-color: rgba(37, 99, 235, 0.4);
      color: #93C5FD;
    }
    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--text-title);
      line-height: 1.35;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-bg-dark .section-title {
      color: #FFFFFF;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.8;
    }
    .section-bg-dark .section-desc {
      color: #94A3B8;
    }

    /* 1. Hero 区域：短问卷自测 + 结果预览 */
    .hero-section {
      background: linear-gradient(180deg, #F0F5FF 0%, #FFFFFF 100%);
      padding: 70px 0 85px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--text-title);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-content h1 mark {
      background: none;
      color: var(--primary-light);
    }
    .hero-content .hero-intro {
      font-size: 1.05rem;
      color: var(--text-body);
      line-height: 1.85;
      margin-bottom: 28px;
    }
    .hero-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 30px;
    }
    .hero-badge-item {
      display: flex;
      align-items: center;
      gap: 8px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-title);
      box-shadow: var(--shadow-sm);
    }
    .hero-badge-item .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10B981;
    }

    /* 问卷自测卡片 */
    .quiz-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
    }
    .quiz-card-header {
      margin-bottom: 20px;
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 14px;
    }
    .quiz-card-header h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-title);
    }
    .quiz-card-header p {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-top: 4px;
    }
    .quiz-form-group {
      margin-bottom: 16px;
    }
    .quiz-form-group label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-title);
      margin-bottom: 6px;
    }
    .quiz-form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      color: var(--text-body);
      outline: none;
      transition: var(--transition);
      background-color: #F8FAFC;
    }
    .quiz-form-control:focus {
      border-color: var(--primary-light);
      background-color: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }
    .quiz-preview-result {
      background: #EFF6FF;
      border: 1px dashed #93C5FD;
      padding: 14px;
      border-radius: var(--radius-sm);
      margin-bottom: 20px;
    }
    .quiz-preview-result .result-title {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .quiz-preview-result .result-desc {
      font-size: 0.8rem;
      color: var(--text-body);
      line-height: 1.6;
    }

    /* 2. 学习目标板块 (4列网格) */
    .goals-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .goal-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 28px 22px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .goal-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-light);
    }
    .goal-icon {
      width: 48px;
      height: 48px;
      background: #EFF6FF;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-light);
      font-weight: 800;
      font-size: 1.25rem;
      margin-bottom: 18px;
    }
    .goal-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 10px;
    }
    .goal-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .goal-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 3px 8px;
      background: #F1F5F9;
      color: var(--text-title);
      border-radius: 4px;
      width: fit-content;
    }

    /* 3. 课程路径板块 (宽卡片排版) */
    .curriculum-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .curriculum-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .curriculum-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .curriculum-thumb {
      height: 200px;
      position: relative;
      overflow: hidden;
      background-color: #E2E8F0;
    }
    .curriculum-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .curriculum-card:hover .curriculum-thumb img {
      transform: scale(1.05);
    }
    .curriculum-tag-float {
      position: absolute;
      top: 12px;
      left: 12px;
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(4px);
      color: #FFFFFF;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 4px;
    }
    .curriculum-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .curriculum-body h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 8px;
    }
    .curriculum-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 18px;
      flex-grow: 1;
    }
    .curriculum-meta-list {
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
      margin-bottom: 18px;
      display: flex;
      justify-content: space-between;
      font-size: 0.825rem;
      color: var(--text-muted);
    }
    .curriculum-meta-list strong {
      color: var(--text-title);
    }

    /* 4. 进度模块 / 4步教学流程轴 (Curriculum Roadmap) */
    .roadmap-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .roadmap-step-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .roadmap-step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
      margin-bottom: 14px;
    }
    .roadmap-step-card h3 {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 8px;
    }
    .roadmap-step-card p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 5. 核心服务矩阵 (6格细分门类) */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-box {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 26px;
      border: 1px solid var(--border-color);
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .service-box:hover {
      border-color: var(--primary-light);
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .service-header-row {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }
    .service-icon-sq {
      width: 40px;
      height: 40px;
      background: #EFF6FF;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      font-weight: 700;
    }
    .service-box h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-title);
    }
    .service-box p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 14px;
    }
    .service-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }
    .service-tags span {
      font-size: 0.75rem;
      background: #F1F5F9;
      color: var(--text-body);
      padding: 2px 8px;
      border-radius: 3px;
    }

    /* 6. 深色教学空间与声学环境区 */
    .studio-showcase {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .studio-text h2 {
      font-size: 2.15rem;
      font-weight: 800;
      color: #FFFFFF;
      line-height: 1.35;
      margin-bottom: 18px;
    }
    .studio-text p {
      font-size: 0.95rem;
      color: #94A3B8;
      line-height: 1.85;
      margin-bottom: 24px;
    }
    .studio-feature-list {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .studio-feature-item {
      background: var(--bg-dark-card);
      border: 1px solid #334155;
      padding: 16px;
      border-radius: var(--radius-sm);
    }
    .studio-feature-item h4 {
      font-size: 0.95rem;
      color: #F8FAFC;
      margin-bottom: 4px;
    }
    .studio-feature-item p {
      font-size: 0.8rem;
      color: #94A3B8;
      margin-bottom: 0;
      line-height: 1.5;
    }
    .studio-gallery {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .studio-gallery img {
      border-radius: var(--radius-sm);
      width: 100%;
      height: 170px;
      object-fit: cover;
      border: 1px solid #334155;
    }

    /* 7. 成果数据条 (Metric Counter Strip) */
    .metric-strip {
      background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
      color: #FFFFFF;
      padding: 48px 0;
    }
    .metric-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-item-val {
      font-size: 2.5rem;
      font-weight: 800;
      color: #FCD34D;
      line-height: 1.1;
      margin-bottom: 6px;
      font-family: Arial, sans-serif;
    }
    .metric-item-title {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 4px;
    }
    .metric-item-desc {
      font-size: 0.8rem;
      color: #BFDBFE;
    }

    /* 8. 成果墙 / 优秀学员案例 (Student Stories Wall) */
    .showcase-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .showcase-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .showcase-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .showcase-card-img {
      height: 180px;
      background: #CBD5E1;
      overflow: hidden;
    }
    .showcase-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .showcase-body {
      padding: 20px;
    }
    .showcase-badge-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 8px;
    }
    .showcase-category {
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--accent);
      background: #FEF3C7;
      padding: 2px 8px;
      border-radius: 4px;
    }
    .showcase-year {
      font-size:0.75rem;
      color: var(--text-muted);
    }
    .showcase-body h3 {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 6px;
    }
    .showcase-body p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 12px;
    }
    .showcase-tag-line {
      font-size: 0.78rem;
      color: var(--primary);
      background: #EFF6FF;
      padding: 6px 10px;
      border-radius: var(--radius-sm);
      display: inline-block;
      font-weight: 600;
    }

    /* 9. 家长与学员口碑评价 (Testimonial Grid) */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 26px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .star-rating {
      color: #F59E0B;
      font-size: 0.9rem;
      margin-bottom: 12px;
    }
    .testimonial-card p {
      font-size: 0.9rem;
      color: var(--text-body);
      line-height: 1.75;
      margin-bottom: 18px;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #F1F5F9;
      padding-top: 14px;
    }
    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    .reviewer-name {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-title);
    }
    .reviewer-tag {
      font-size: 0.78rem;
      color: var(--text-muted);
    }

    /* 10. 资讯列表 (News & Insights) */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 26px;
    }
    .news-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .news-card:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--primary-light);
    }
    .news-cover {
      height: 170px;
      position: relative;
      background: #CBD5E1;
    }
    .news-cover img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .news-date {
      position: absolute;
      bottom: 10px;
      right: 10px;
      background: rgba(15, 23, 42, 0.75);
      color: #FFFFFF;
      font-size: 0.75rem;
      padding: 3px 8px;
      border-radius: 4px;
    }
    .news-body {
      padding: 22px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .news-tag {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary-light);
      margin-bottom: 8px;
    }
    .news-body h3 {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 10px;
      line-height: 1.5;
    }
    .news-body p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .news-more-link {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary-light);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 11. 权威考级与合作单位 (Partners & Certifications) */
    .partner-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .partner-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 20px;
      border-radius: var(--radius-sm);
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .partner-item strong {
      display: block;
      font-size: 0.95rem;
      color: var(--text-title);
      margin-bottom: 4px;
    }
    .partner-item span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 12. FAQ 手风琴 (Accordion) */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .faq-item[open] {
      border-color: var(--primary-light);
      box-shadow: var(--shadow-md);
    }
    .faq-summary {
      padding: 18px 22px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-title);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-summary::-webkit-details-marker {
      display: none;
    }
    .faq-summary::after {
      content: "+";
      font-size: 1.35rem;
      color: var(--primary-light);
      transition: transform 0.25s ease;
    }
    .faq-item[open] .faq-summary::after {
      content: "−";
    }
    .faq-content {
      padding: 0 22px 20px 22px;
      font-size: 0.9rem;
      color: var(--text-body);
      line-height: 1.75;
      border-top: 1px solid #F1F5F9;
      padding-top: 14px;
    }

    /* 13. 保障条 (Trust & Guarantee Strip) */
    .guarantee-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .guarantee-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 20px;
      display: flex;
      gap: 14px;
      align-items: flex-start;
      box-shadow: var(--shadow-sm);
    }
    .guarantee-icon {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: #FEF3C7;
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      flex-shrink: 0;
    }
    .guarantee-text h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 4px;
    }
    .guarantee-text p {
      font-size: 0.8rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 14. 转化收口区 (CTA Banner) */
    .cta-banner-card {
      background: linear-gradient(135deg, #1E3A8A 0%, #172554 100%);
      border-radius: var(--radius-lg);
      padding: 50px 40px;
      color: #FFFFFF;
      box-shadow: var(--shadow-lg);
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 36px;
      align-items: center;
    }
    .cta-left h2 {
      font-size: 2.1rem;
      font-weight: 800;
      margin-bottom: 14px;
      line-height: 1.3;
    }
    .cta-left p {
      font-size: 0.95rem;
      color: #BFDBFE;
      line-height: 1.8;
      margin-bottom: 20px;
    }
    .cta-form-box {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 28px;
      color: var(--text-title);
      box-shadow: var(--shadow-md);
    }
    .cta-form-box h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 14px;
      text-align: center;
    }
    .cta-input-group {
      margin-bottom: 12px;
    }
    .cta-input-group input, .cta-input-group select {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      outline: none;
    }
    .cta-input-group input:focus, .cta-input-group select:focus {
      border-color: var(--primary-light);
    }
    .cta-form-btn {
      width: 100%;
      margin-top: 6px;
    }

    /* 页脚 (Footer) */
    .site-footer {
      background-color: #0B1329;
      color: #94A3B8;
      padding: 60px 0 24px 0;
      font-size: 0.875rem;
      border-top: 1px solid #1E293B;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col-brand .footer-logo {
      font-size: 1.35rem;
      font-weight: 800;
      color: #FFFFFF;
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 14px;
    }
    .footer-col-brand p {
      line-height: 1.8;
      margin-bottom: 16px;
    }
    .footer-col h4 {
      font-size: 1rem;
      font-weight: 700;
      color: #F8FAFC;
      margin-bottom: 18px;
      position: relative;
      padding-bottom: 8px;
    }
    .footer-col h4::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 24px;
      height: 2px;
      background: var(--primary-light);
    }
    .footer-col ul {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-col ul li a:hover {
      color: #FFFFFF;
      padding-left: 4px;
    }
    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 24px;
      text-align: center;
      font-size: 0.8rem;
      color: #64748B;
      line-height: 1.8;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .curriculum-grid, .showcase-grid, .testimonial-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .goals-grid, .roadmap-timeline, .partner-row, .guarantee-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-grid, .studio-showcase, .cta-banner-card {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .main-nav {
        display: none;
        position: absolute;
        top: 74px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
        gap: 16px;
      }
      .main-nav.active {
        display: flex;
      }
      .header-actions .btn {
        display: none;
      }
      .section-wrap {
        padding: 55px 0;
      }
      .section-title {
        font-size: 1.7rem;
      }
      .hero-content h1 {
        font-size: 2.1rem;
      }
      .curriculum-grid, .showcase-grid, .testimonial-grid, .news-grid, .services-grid, .goals-grid, .roadmap-timeline, .partner-row, .guarantee-bar {
        grid-template-columns: 1fr;
      }
      .metric-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 18px;
      }
      .cta-banner-card {
        padding: 30px 20px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }