/* roulang page: index */
:root {
      --primary-green: #00FF85;
      --primary-dark: #121212;
      --bg-surface: #1a1a1a;
      --bg-surface-elevated: #242424;
      --border-color: rgba(255, 255, 255, 0.08);
      --text-main: #FFFFFF;
      --text-muted: #A0A0A0;
      --text-dim: #707070;
      --gradient-accent: linear-gradient(135deg, #7928CA 0%, #0070F3 100%);
      --gradient-green: linear-gradient(135deg, #00FF85 0%, #00BD65 100%);
      --radius-card: 16px;
      --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.35);
      --shadow-hover: 0 20px 40px rgba(0, 255, 133, 0.12);
      --container-max: 1200px;
    }

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

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

    body {
      background-color: var(--primary-dark);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.25s ease;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-card);
    }

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

    /* 顶部导航 */
    header.site-header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: 72px;
      background: rgba(18, 18, 18, 0.85);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-color);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.25rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--text-main);
    }

    .logo-badge {
      width: 32px;
      height: 32px;
      background: var(--gradient-green);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-dark);
      font-weight: 900;
      font-size: 1.1rem;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-item a {
      font-size: 0.95rem;
      color: var(--text-muted);
      padding: 8px 0;
      position: relative;
    }

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

    .nav-item.active a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: var(--primary-green);
      border-radius: 2px;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      border-radius: 999px;
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      border: 1px solid transparent;
      min-height: 44px;
    }

    .btn-primary {
      background: var(--primary-green);
      color: var(--primary-dark);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(0, 255, 133, 0.3);
      background: #26ff95;
    }

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

    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(121, 40, 202, 0.4);
    }

    .btn-outline {
      border-color: rgba(255, 255, 255, 0.2);
      color: var(--text-main);
      background: rgba(255, 255, 255, 0.03);
    }

    .btn-outline:hover {
      border-color: var(--primary-green);
      color: var(--primary-green);
      background: rgba(0, 255, 133, 0.05);
    }

    /* Hero 板块：预约到店、服务卖点、时段选择 */
    .hero-section {
      padding: 140px 0 80px;
      position: relative;
      background: radial-gradient(circle at 80% 20%, rgba(0, 255, 133, 0.12) 0%, transparent 60%),
                  radial-gradient(circle at 10% 80%, rgba(121, 40, 202, 0.18) 0%, transparent 50%),
                  var(--primary-dark);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 2.85rem;
      line-height: 1.2;
      font-weight: 800;
      letter-spacing: -1px;
      margin-bottom: 20px;
    }

    .hero-content h1 span {
      background: linear-gradient(90deg, #FFFFFF 0%, var(--primary-green) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 580px;
      line-height: 1.8;
    }

    .hero-badge-row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 36px;
    }

    .hero-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 999px;
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    .hero-pill-dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--primary-green);
    }

    /* 预约到店 / 接入测试卡片 */
    .booking-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-soft);
      position: relative;
    }

    .booking-card::before {
      content: '';
      position: absolute;
      top: -1px;
      left: 20%;
      right: 20%;
      height: 2px;
      background: var(--gradient-green);
      border-radius: 999px;
    }

    .booking-card h3 {
      font-size: 1.35rem;
      margin-bottom: 12px;
    }

    .booking-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 24px;
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 6px;
    }

    .form-control, .form-select {
      width: 100%;
      background: var(--bg-surface-elevated);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 12px 14px;
      color: var(--text-main);
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-control:focus, .form-select:focus {
      border-color: var(--primary-green);
    }

    .time-slot-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 8px;
      margin-bottom: 20px;
    }

    .slot-chip {
      background: var(--bg-surface-elevated);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 8px 4px;
      text-align: center;
      font-size: 0.82rem;
      cursor: pointer;
      color: var(--text-muted);
      transition: all 0.2s ease;
    }

    .slot-chip.selected, .slot-chip:hover {
      background: rgba(0, 255, 133, 0.1);
      border-color: var(--primary-green);
      color: var(--primary-green);
      font-weight: 600;
    }

    /* Section 通用规范 */
    section {
      padding: 88px 0;
      border-bottom: 1px solid var(--border-color);
    }

    section:nth-of-type(even) {
      background-color: #161616;
    }

    .section-header {
      margin-bottom: 56px;
      text-align: center;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary-green);
      text-transform: uppercase;
      letter-spacing: 1.5px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.75;
    }

    /* 卡片网格与样式 */
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .card-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

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

    .feature-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-soft);
      transition: all 0.3s ease;
      position: relative;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0, 255, 133, 0.3);
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(0, 255, 133, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary-green);
      font-size: 1.25rem;
      font-weight: 800;
    }

    .feature-card h4 {
      font-size: 1.2rem;
      margin-bottom: 12px;
    }

    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 安全主张板块 */
    .security-badge-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .sec-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      padding: 28px;
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }

    .sec-number {
      font-size: 1.75rem;
      font-weight: 900;
      color: var(--primary-green);
      line-height: 1;
    }

    .sec-info h4 {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }

    .sec-info p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 检查项 Checklist */
    .checklist-wrapper {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      padding: 40px;
    }

    .checklist-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px 36px;
    }

    .check-item {
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }

    .check-bullet {
      width: 24px;
      height: 24px;
      background: rgba(0, 255, 133, 0.15);
      color: var(--primary-green);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.8rem;
      flex-shrink: 0;
      margin-top: 2px;
    }

    .check-content h5 {
      font-size: 1rem;
      margin-bottom: 4px;
    }

    .check-content p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 合规徽章墙 */
    .compliance-bar {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: 20px;
    }

    .badge-card {
      flex: 1;
      min-width: 200px;
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      padding: 24px;
      text-align: center;
    }

    .badge-tag {
      font-size: 0.75rem;
      color: var(--primary-green);
      background: rgba(0, 255, 133, 0.08);
      padding: 4px 10px;
      border-radius: 999px;
      display: inline-block;
      margin-bottom: 12px;
    }

    .badge-card h4 {
      font-size: 1.1rem;
      margin-bottom: 6px;
    }

    .badge-card p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 边界说明与系统架构 */
    .boundary-split {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .boundary-text h3 {
      font-size: 1.75rem;
      margin-bottom: 16px;
    }

    .boundary-text p {
      color: var(--text-muted);
      margin-bottom: 24px;
    }

    .spec-table {
      width: 100%;
      border-collapse: collapse;
    }

    .spec-table tr {
      border-bottom: 1px solid var(--border-color);
    }

    .spec-table td {
      padding: 14px 0;
      font-size: 0.92rem;
    }

    .spec-table td:first-child {
      color: var(--text-muted);
      width: 40%;
    }

    .spec-table td:last-child {
      font-weight: 600;
      color: var(--text-main);
    }

    /* 资讯摘要卡片 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

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

    .news-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: var(--radius-card) var(--radius-card) 0 0;
    }

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

    .news-date {
      font-size: 0.8rem;
      color: var(--primary-green);
      margin-bottom: 8px;
    }

    .news-body h4 {
      font-size: 1.1rem;
      margin-bottom: 12px;
      line-height: 1.4;
    }

    .news-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .news-link {
      margin-top: auto;
      font-size: 0.88rem;
      color: var(--primary-green);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* 信任背书与评测反馈 */
    .endorsement-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

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

    .star-rating {
      color: #FFB800;
      font-size: 0.95rem;
      margin-bottom: 16px;
      letter-spacing: 2px;
    }

    .endorsement-quote {
      font-size: 0.92rem;
      color: var(--text-muted);
      margin-bottom: 24px;
      line-height: 1.7;
    }

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

    .endorser-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--bg-surface-elevated);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary-green);
    }

    .endorser-meta h5 {
      font-size: 0.95rem;
    }

    .endorser-meta span {
      font-size: 0.82rem;
      color: var(--text-dim);
    }

    /* 拼团转化与体验阶梯 */
    .group-buy-wrapper {
      background: linear-gradient(180deg, rgba(36, 36, 36, 0.6) 0%, rgba(18, 18, 18, 0.9) 100%);
      border: 1px solid rgba(0, 255, 133, 0.2);
      border-radius: var(--radius-card);
      padding: 48px;
      box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    }

    .group-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-bottom: 40px;
    }

    .group-step-card {
      background: var(--bg-surface-elevated);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 20px;
      text-align: center;
    }

    .step-idx {
      width: 28px;
      height: 28px;
      background: var(--primary-green);
      color: var(--primary-dark);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.85rem;
      margin: 0 auto 12px;
    }

    .group-step-card h5 {
      font-size: 1rem;
      margin-bottom: 6px;
    }

    .group-step-card p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .progress-box {
      background: var(--bg-surface-elevated);
      border-radius: 12px;
      padding: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .progress-bar-container {
      flex-grow: 1;
    }

    .progress-labels {
      display: flex;
      justify-content: space-between;
      font-size: 0.85rem;
      margin-bottom: 8px;
    }

    .progress-track {
      height: 8px;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 999px;
      overflow: hidden;
    }

    .progress-fill {
      height: 100%;
      width: 76%;
      background: var(--gradient-green);
      border-radius: 999px;
    }

    /* 成果数据条 */
    .metric-ribbon {
      background: var(--bg-surface);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 48px 0;
    }

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

    .metric-value {
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--primary-green);
      line-height: 1.1;
      margin-bottom: 8px;
      font-feature-settings: "tnum";
    }

    .metric-label {
      font-size: 0.92rem;
      color: var(--text-muted);
    }

    /* 方法步骤：采集-清洗-建模-反馈 */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }

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

    .process-step-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: rgba(255, 255, 255, 0.08);
      position: absolute;
      top: 16px;
      right: 20px;
    }

    .process-card h4 {
      font-size: 1.15rem;
      margin-bottom: 10px;
    }

    .process-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 常见问题 Accordion */
    .faq-container {
      max-width: 840px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      overflow: hidden;
    }

    .faq-question {
      padding: 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.05rem;
    }

    .faq-question:hover {
      color: var(--primary-green);
    }

    .faq-answer {
      padding: 0 24px 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    /* 页脚 */
    footer.site-footer {
      padding: 80px 0 40px;
      background: #0d0d0d;
      border-top: 1px solid var(--border-color);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 60px;
    }

    .footer-brand h3 {
      font-size: 1.25rem;
      margin-bottom: 16px;
    }

    .footer-brand p {
      color: var(--text-muted);
      font-size: 0.9rem;
      max-width: 320px;
      margin-bottom: 24px;
    }

    .footer-links h4 {
      font-size: 0.95rem;
      margin-bottom: 20px;
      color: var(--text-main);
    }

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

    .footer-links li {
      margin-bottom: 12px;
    }

    .footer-links a {
      color: var(--text-muted);
      font-size: 0.9rem;
      transition: color 0.2s;
    }

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

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-dim);
      font-size: 0.85rem;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .card-grid-3, .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .card-grid-2, .card-grid-3, .card-grid-4, .checklist-grid, .security-badge-grid { grid-template-columns: 1fr; }
      .nav-menu { display: none; }
      .header-inner { gap: 16px; }
      .hero-section { padding: 100px 0 60px; }
      .section-title { font-size: 1.8rem; }
    }