/* roulang page: index */
:root {
      --primary: #0F172A;
      --accent: #1E3A8A;
      --teal: #0D9488;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0B0F19;
      --border-color: #E2E8F0;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --text-light: #94A3B8;
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-full: 9999px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 10px 15px -3px rgba(0,0,0,0.02);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -2px rgba(0,0,0,0.05);
      --transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-white);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, select {
      font: inherit;
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* Top Bar */
    .top-bar {
      height: 36px;
      background-color: #F1F5F9;
      border-bottom: 1px solid var(--border-color);
      font-size: 12px;
      color: var(--text-muted);
      display: flex;
      align-items: center;
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .pulse-dot {
      width: 7px;
      height: 7px;
      background-color: var(--teal);
      border-radius: 50%;
      box-shadow: 0 0 0 2px rgba(13, 148, 136, 0.2);
    }
    /* Nav */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background-color: rgba(255, 255, 255, 0.98);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-inner {
      height: 70px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand-logo {
      font-size: 19px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.02em;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .brand-logo .logo-mark {
      width: 28px;
      height: 28px;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 6px;
      font-size: 14px;
      font-weight: 800;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 24px;
      list-style: none;
    }
    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      padding: 6px 0;
      position: relative;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
    }
    .btn-primary:hover {
      background-color: #1e293b;
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(15, 23, 42, 0.15);
    }
    .btn-outline {
      background-color: transparent;
      border-color: var(--border-color);
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      background-color: #f8fafc;
    }
    .btn-teal {
      background-color: var(--teal);
      color: #ffffff;
    }
    .btn-teal:hover {
      background-color: #0f766e;
    }
    /* Section Shared */
    section {
      padding: 80px 0;
      position: relative;
    }
    .section-head {
      margin-bottom: 48px;
    }
    .section-tag {
      font-size: 12px;
      text-transform: uppercase;
      font-weight: 700;
      letter-spacing: 0.08em;
      color: var(--teal);
      margin-bottom: 8px;
      display: inline-block;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.02em;
      line-height: 1.28;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
      max-width: 680px;
      line-height: 1.7;
    }
    /* Hero: 裂变与评估额度激励舞台 */
    .hero-section {
      background: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
      padding: 70px 0 90px;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 42px;
      font-weight: 800;
      letter-spacing: -0.03em;
      line-height: 1.22;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero-p {
      font-size: 16px;
      color: #475569;
      line-height: 1.75;
      margin-bottom: 30px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      align-items: center;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }
    .hero-perk-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .perk-header {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      margin-bottom: 12px;
    }
    .perk-title {
      font-size: 15px;
      font-weight: 700;
      color: var(--primary);
    }
    .perk-quota {
      font-size: 20px;
      font-weight: 800;
      color: var(--teal);
    }
    .progress-track {
      background-color: #E2E8F0;
      height: 8px;
      border-radius: var(--radius-full);
      overflow: hidden;
      margin-bottom: 10px;
    }
    .progress-fill {
      width: 68%;
      height: 100%;
      background: linear-gradient(90deg, var(--accent) 0%, var(--teal) 100%);
    }
    .progress-meta {
      display: flex;
      justify-content: space-between;
      font-size: 12px;
      color: var(--text-muted);
    }
    /* Problem Statement */
    .problem-section {
      background-color: #FFFFFF;
    }
    .problem-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .problem-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      background: #FFFFFF;
      transition: var(--transition);
    }
    .problem-card:hover {
      border-color: #CBD5E1;
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }
    .problem-num {
      font-size: 13px;
      font-weight: 800;
      color: var(--teal);
      letter-spacing: 0.05em;
      margin-bottom: 14px;
      display: block;
    }
    .problem-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .problem-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }
    /* Demo Steps */
    .demo-section {
      background-color: var(--bg-light);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .step-list {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-item {
      background: #FFFFFF;
      padding: 26px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }
    .step-badge {
      width: 32px;
      height: 32px;
      background: #EFF6FF;
      color: var(--accent);
      font-weight: 700;
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      margin-bottom: 16px;
    }
    .step-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 10px;
    }
    .step-text {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.65;
    }
    /* Result Preview */
    .preview-section {
      background-color: #FFFFFF;
    }
    .preview-box {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1fr;
      box-shadow: var(--shadow-sm);
    }
    .preview-visual {
      background-color: #0F172A;
      padding: 36px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .radar-mock {
      border: 1px dashed rgba(255,255,255,0.2);
      border-radius: 6px;
      padding: 24px;
      background: rgba(255,255,255,0.02);
    }
    .radar-row {
      display: flex;
      justify-content: space-between;
      color: #94A3B8;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .radar-row span:last-child {
      color: #38BDF8;
      font-weight: 700;
    }
    .preview-content {
      padding: 44px 36px;
      background: #FFFFFF;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .preview-content h3 {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .preview-content p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .preview-pills {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
    }
    .pill {
      font-size: 12px;
      padding: 5px 12px;
      border-radius: var(--radius-full);
      background-color: #F1F5F9;
      color: #334155;
      font-weight: 500;
    }
    /* Core Dimensions / Advantages */
    .dim-section {
      background-color: var(--bg-light);
    }
    .dim-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .dim-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      transition: var(--transition);
    }
    .dim-card:hover {
      border-color: var(--accent);
      transform: translateY(-2px);
    }
    .dim-tag {
      font-size: 11px;
      color: var(--teal);
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 10px;
    }
    .dim-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 10px;
    }
    .dim-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.65;
    }
    /* Deep Cases & Principles: Dark Section */
    .deep-case-section {
      background-color: var(--bg-dark);
      color: #F8FAFC;
    }
    .deep-case-section .section-title {
      color: #FFFFFF;
    }
    .deep-case-section .section-desc {
      color: #94A3B8;
    }
    .case-container-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }
    .case-card-dark {
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-md);
      padding: 32px;
      background: rgba(255,255,255,0.03);
    }
    .case-badge-dark {
      display: inline-block;
      padding: 4px 10px;
      border-radius: var(--radius-full);
      font-size: 12px;
      background: rgba(13, 148, 136, 0.2);
      color: #2DD4BF;
      margin-bottom: 14px;
    }
    .case-title-dark {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
      color: #FFFFFF;
    }
    .case-text-dark {
      font-size: 14px;
      color: #94A3B8;
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .case-data-row {
      display: flex;
      gap: 24px;
      padding-top: 16px;
      border-top: 1px solid rgba(255,255,255,0.08);
    }
    .case-num-block span {
      display: block;
    }
    .case-val {
      font-size: 22px;
      font-weight: 800;
      color: #38BDF8;
    }
    .case-lbl {
      font-size: 12px;
      color: #64748B;
    }
    /* Bottlenecks / 卡住点 */
    .stuck-section {
      background-color: #FFFFFF;
    }
    .stuck-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .stuck-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      background: #FFFFFF;
    }
    .stuck-q {
      font-size: 16px;
      font-weight: 700;
      color: #B91C1C;
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .stuck-a {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }
    /* Coupon Wall: 蓝图要求领券主视觉与券面网格 */
    .coupon-section {
      background: linear-gradient(180deg, #F8FAFC 0%, #EFF6FF 100%);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .coupon-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-bottom: 36px;
    }
    .coupon-ticket {
      background: #FFFFFF;
      border: 1px solid #BFDBFE;
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: 0 4px 12px rgba(30, 58, 138, 0.04);
    }
    .coupon-ticket::before, .coupon-ticket::after {
      content: "";
      position: absolute;
      top: 50%;
      width: 14px;
      height: 14px;
      background: #EFF6FF;
      border-radius: 50%;
      transform: translateY(-50%);
    }
    .coupon-ticket::before { left: -7px; }
    .coupon-ticket::after { right: -7px; }
    .coupon-top {
      margin-bottom: 16px;
    }
    .coupon-value {
      font-size: 28px;
      font-weight: 900;
      color: var(--accent);
      margin-bottom: 4px;
    }
    .coupon-name {
      font-size: 15px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .coupon-desc {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .coupon-foot {
      padding-top: 14px;
      border-top: 1px dashed var(--border-color);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .coupon-limit {
      font-size: 11px;
      color: var(--text-light);
    }
    .coupon-rules {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    /* Success Path */
    .success-path-section {
      background-color: #FFFFFF;
    }
    .path-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .path-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      background: var(--bg-light);
    }
    .path-step-label {
      font-size: 12px;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 10px;
      display: block;
    }
    .path-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 10px;
    }
    .path-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.65;
    }
    /* Industry Insights / News */
    .news-section {
      background-color: var(--bg-light);
      border-top: 1px solid var(--border-color);
    }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-light);
      margin-bottom: 8px;
    }
    .news-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .news-snippet {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .news-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--teal);
    }
    /* Metrics Row */
    .metrics-section {
      background-color: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 50px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-item {
      padding: 10px 16px;
    }
    .metric-value {
      font-size: 34px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.02em;
      margin-bottom: 4px;
    }
    .metric-name {
      font-size: 13px;
      color: var(--text-muted);
    }
    /* Guarantee Strip */
    .guarantee-section {
      background-color: #F8FAFC;
      padding: 40px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .guarantee-item {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .g-icon {
      width: 36px;
      height: 36px;
      background: #E2E8F0;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 14px;
      color: var(--primary);
      flex-shrink: 0;
    }
    .g-text h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 2px;
    }
    .g-text p {
      font-size: 12px;
      color: var(--text-muted);
    }
    /* Conversion Action: Form / Contact */
    .cta-section {
      background-color: #FFFFFF;
      padding: 80px 0;
    }
    .cta-box {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      background: linear-gradient(135deg, #F8FAFC 0%, #FFFFFF 100%);
      padding: 48px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
    }
    .cta-info h3 {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 14px;
    }
    .cta-info p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .cta-contacts {
      font-size: 13px;
      color: #475569;
      line-height: 1.8;
    }
    .cta-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group label {
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
    }
    .form-input {
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #FFFFFF;
      color: var(--text-main);
      font-size: 14px;
    }
    .form-input:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
    }
    /* Footer */
    .site-footer {
      background-color: var(--bg-dark);
      color: #94A3B8;
      border-top: 1px solid rgba(255,255,255,0.1);
      padding: 60px 0 30px;
      font-size: 13px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-col ul a:hover {
      color: #FFFFFF;
    }
    .footer-brand {
      font-size: 18px;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 12px;
      display: inline-block;
    }
    .footer-bottom {
      padding-top: 24px;
      border-top: 1px solid rgba(255,255,255,0.08);
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
      color: #64748B;
    }
    /* Responsive Breakpoints */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .problem-grid, .dim-grid, .stuck-grid, .coupon-grid, .success-path-section .path-row, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-list { grid-template-columns: repeat(2, 1fr); }
      .case-container-grid, .preview-box, .cta-box { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .metrics-grid, .guarantee-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .top-bar { display: none; }
      .hero-h1 { font-size: 30px; }
      .section-title { font-size: 24px; }
      .problem-grid, .dim-grid, .stuck-grid, .coupon-grid, .success-path-section .path-row, .news-grid, .step-list, .footer-grid, .metrics-grid, .guarantee-grid {
        grid-template-columns: 1fr;
      }
      .cta-box { padding: 24px; }
      .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }
    }