/* roulang page: index */
:root {
      --primary: #0F172A;
      --primary-light: #1E293B;
      --accent: #D97706;
      --accent-hover: #B45309;
      --accent-blue: #2563EB;
      --bg-main: #F9F9FB;
      --bg-pure: #FFFFFF;
      --bg-dark: #121316;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --text-light: #94A3B8;
      --border-color: #E2E8F0;
      --border-dark: #27272A;
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px -4px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 16px 36px -6px rgba(15, 23, 42, 0.12);
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 12px;
    }

    * {
      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", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, input, textarea, select {
      font-family: inherit;
      border: none;
      outline: none;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部双行导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: var(--bg-pure);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .utility-bar {
      background: #0B0F19;
      color: var(--text-light);
      font-size: 0.8125rem;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

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

    .utility-items {
      display: flex;
      gap: 20px;
      align-items: center;
    }

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

    .brand-logo {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .brand-badge {
      font-size: 0.6875rem;
      background: var(--primary);
      color: #fff;
      padding: 2px 6px;
      border-radius: var(--radius-sm);
      font-weight: 600;
    }

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

    .nav-links a {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--primary-light);
    }

    .nav-links a:hover {
      color: var(--accent);
    }

    .btn-nav-action {
      background: var(--primary);
      color: #fff !important;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-size: 0.875rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
    }

    .btn-nav-action:hover {
      background: var(--accent);
    }

    /* Hero：优惠券墙入口蓝图结构 */
    .hero-section {
      background: linear-gradient(180deg, #FFFFFF 0%, #F1F4F9 100%);
      padding: 72px 0 60px;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(217, 119, 6, 0.1);
      color: var(--accent);
      padding: 6px 14px;
      border-radius: 50px;
      font-size: 0.8125rem;
      font-weight: 700;
      margin-bottom: 20px;
      text-transform: uppercase;
    }

    .hero-title {
      font-size: 2.75rem;
      line-height: 1.25;
      color: var(--primary);
      font-weight: 800;
      letter-spacing: -0.02em;
      margin-bottom: 24px;
    }

    .hero-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 32px;
    }

    /* 主券面放大卡片结构 */
    .coupon-showcase {
      background: #FFFFFF;
      border: 2px dashed #CBD5E1;
      border-radius: var(--radius-lg);
      padding: 32px;
      position: relative;
      box-shadow: var(--shadow-lg);
      overflow: hidden;
    }

    .coupon-showcase::before, .coupon-showcase::after {
      content: '';
      position: absolute;
      top: 50%;
      width: 24px;
      height: 24px;
      background: #F1F4F9;
      border-radius: 50%;
      transform: translateY(-50%);
    }
    .coupon-showcase::before { left: -12px; }
    .coupon-showcase::after { right: -12px; }

    .coupon-badge {
      position: absolute;
      top: 16px;
      right: 16px;
      background: #DC2626;
      color: #FFF;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
    }

    .coupon-value {
      font-size: 2.6rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
      display: flex;
      align-items: baseline;
      gap: 4px;
    }

    .coupon-value span {
      font-size: 1rem;
      color: var(--accent);
      font-weight: 600;
    }

    .coupon-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
    }

    .coupon-detail-list {
      list-style: none;
      margin-bottom: 24px;
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    .coupon-detail-list li {
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .coupon-detail-list li::before {
      content: '✓';
      color: var(--accent);
      font-weight: bold;
    }

    .btn-claim {
      width: 100%;
      background: var(--accent);
      color: #fff;
      font-weight: 700;
      padding: 14px 20px;
      border-radius: var(--radius-sm);
      font-size: 1rem;
      cursor: pointer;
      text-align: center;
      transition: background 0.2s ease;
      display: block;
    }

    .btn-claim:hover {
      background: var(--accent-hover);
    }

    /* 通用板块规范 */
    .section-block {
      padding: 84px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      margin-bottom: 52px;
    }

    .section-header.text-center {
      text-align: center;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .section-tag {
      font-size: 0.8125rem;
      font-weight: 700;
      color: var(--accent);
      text-transform: uppercase;
      letter-spacing: 0.06em;
      margin-bottom: 12px;
      display: inline-block;
    }

    .section-title {
      font-size: 2.125rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.35;
      margin-bottom: 16px;
    }

    .section-intro {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.8;
    }

    /* KPI 看板 */
    .kpi-board {
      background: #FFFFFF;
      padding: 60px 0;
      border-bottom: 1px solid var(--border-color);
    }

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

    .kpi-item {
      padding: 24px;
      background: var(--bg-main);
      border-left: 4px solid var(--accent);
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    }

    .kpi-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .kpi-label {
      font-size: 0.9375rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .kpi-sub {
      font-size: 0.8125rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 服务矩阵（非均匀网格） */
    .matrix-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr 0.8fr;
      gap: 24px;
    }

    .matrix-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 36px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .matrix-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .matrix-card.featured {
      background: linear-gradient(135deg, #1E293B 0%, #0F172A 100%);
      color: #FFFFFF;
      border-color: #334155;
    }

    .matrix-card.featured .matrix-title,
    .matrix-card.featured .matrix-list li {
      color: #FFFFFF;
    }

    .matrix-card.featured .matrix-desc {
      color: #94A3B8;
    }

    .matrix-title {
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 14px;
    }

    .matrix-desc {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .matrix-list {
      list-style: none;
      font-size: 0.875rem;
      margin-bottom: 24px;
    }

    .matrix-list li {
      padding: 8px 0;
      border-top: 1px solid rgba(0, 0, 0, 0.06);
      display: flex;
      justify-content: space-between;
      color: var(--text-main);
    }

    .matrix-card.featured .matrix-list li {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    /* 结果对比 (Before / After 对照表) */
    .compare-container {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
    }

    .compare-col {
      padding: 44px;
    }

    .compare-col.traditional {
      background: #F8FAFC;
      border-right: 1px solid var(--border-color);
    }

    .compare-col.advanced {
      background: #FFFFFF;
    }

    .compare-tag {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
    }

    .tag-trad { background: #E2E8F0; color: #475569; }
    .tag-adv { background: #FEF3C7; color: #B45309; }

    .compare-heading {
      font-size: 1.4rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 24px;
    }

    .compare-item {
      margin-bottom: 20px;
      padding-bottom: 20px;
      border-bottom: 1px solid var(--border-color);
    }

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

    .compare-item-title {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--primary);
    }

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

    /* 深色理念/里程碑板块 */
    .dark-section {
      background: var(--bg-dark);
      color: #FFFFFF;
      border-bottom: 1px solid var(--border-dark);
    }

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

    .dark-section .section-intro {
      color: var(--text-light);
    }

    .milestone-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
      margin-top: 40px;
    }

    .timeline-node {
      background: #18191D;
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 28px;
      position: relative;
    }

    .timeline-node::before {
      content: '';
      position: absolute;
      top: -10px;
      left: 28px;
      width: 20px;
      height: 4px;
      background: var(--accent);
      border-radius: 2px;
    }

    .node-phase {
      font-size: 0.75rem;
      font-weight: 800;
      color: var(--accent);
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 10px;
    }

    .node-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 12px;
    }

    .node-desc {
      font-size: 0.875rem;
      color: var(--text-light);
      line-height: 1.7;
    }

    /* 资讯与行业观察 */
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

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

    .insight-thumb {
      height: 200px;
      width: 100%;
      object-fit: cover;
    }

    .insight-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .insight-meta {
      font-size: 0.75rem;
      color: var(--accent);
      font-weight: 700;
      margin-bottom: 10px;
    }

    .insight-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.45;
      margin-bottom: 12px;
    }

    .insight-summary {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 16px;
    }

    .insight-link {
      font-size: 0.875rem;
      font-weight: 700;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* 平台保障 (Trust & Security) */
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .guarantee-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      text-align: center;
    }

    .guarantee-icon {
      width: 52px;
      height: 52px;
      line-height: 52px;
      margin: 0 auto 18px;
      background: #FEF3C7;
      color: var(--accent);
      font-size: 1.4rem;
      font-weight: 800;
      border-radius: 50%;
    }

    .guarantee-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 10px;
    }

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

    /* 快速解答 FAQ (Accordion) */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
      overflow: hidden;
    }

    .faq-header {
      padding: 20px 24px;
      font-size: 1.0625rem;
      font-weight: 700;
      color: var(--primary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FFFFFF;
      transition: background 0.2s;
    }

    .faq-header:hover {
      background: #F8FAFC;
    }

    .faq-icon {
      font-size: 1.25rem;
      color: var(--accent);
      font-weight: 600;
    }

    .faq-content {
      padding: 0 24px 20px;
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.75;
      display: block;
    }

    /* 案例实战墙与图文展示 */
    .case-banner-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: center;
    }

    .case-banner-img {
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      width: 100%;
      height: 380px;
      object-fit: cover;
    }

    /* 浮动与底部转化条 */
    .conversion-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(15, 23, 42, 0.96);
      backdrop-filter: blur(8px);
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding: 14px 0;
      z-index: 99;
      color: #FFFFFF;
    }

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

    .conversion-text {
      font-size: 0.9375rem;
      font-weight: 500;
    }

    .conversion-text strong {
      color: var(--accent);
    }

    .conversion-btn {
      background: var(--accent);
      color: #fff;
      padding: 8px 22px;
      border-radius: var(--radius-sm);
      font-size: 0.875rem;
      font-weight: 700;
    }

    .conversion-btn:hover {
      background: var(--accent-hover);
    }

    /* 页脚 */
    .site-footer {
      background: #0B0F19;
      color: var(--text-light);
      padding: 72px 0 96px;
      border-top: 1px solid #1E293B;
      font-size: 0.875rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 56px;
    }

    .footer-logo {
      font-size: 1.25rem;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 16px;
    }

    .footer-col-title {
      font-size: 0.9375rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 20px;
    }

    .footer-nav {
      list-style: none;
    }

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

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

    .footer-bottom {
      padding-top: 32px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.8125rem;
      color: #64748B;
    }

    /* 响应式断点适配 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .matrix-grid { grid-template-columns: 1fr; }
      .kpi-grid { grid-template-columns: repeat(2, 1fr); }
      .milestone-timeline { grid-template-columns: repeat(2, 1fr); }
      .insights-grid { grid-template-columns: repeat(2, 1fr); }
      .guarantee-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .utility-bar { display: none; }
      .nav-links { display: none; }
      .hero-title { font-size: 2.1rem; }
      .compare-grid { grid-template-columns: 1fr; }
      .compare-col.traditional { border-right: none; border-bottom: 1px solid var(--border-color); }
      .milestone-timeline { grid-template-columns: 1fr; }
      .insights-grid { grid-template-columns: 1fr; }
      .guarantee-grid { grid-template-columns: 1fr; }
      .kpi-grid { grid-template-columns: 1fr; }
      .case-banner-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
      .conversion-flex { flex-direction: column; gap: 8px; text-align: center; }
    }