/* roulang page: index */
:root {
      --primary-dark: #1A1A1A;
      --accent-gold: #C8A96E;
      --accent-gold-hover: #B6964F;
      --accent-light: #D4AF37;
      --bg-warm: #FAFAFA;
      --bg-dark: #1E1E1E;
      --card-white: #FFFFFF;
      --text-body: #4A4A4A;
      --text-muted: #8A8A8A;
      --text-light: #B0B0B0;
      --border-light: #E5E5E5;
      --border-input: #D5D5D5;
      --radius-sm: 2px;
      --radius-card: 4px;
      --shadow-default: 0 1px 3px rgba(0,0,0,0.04);
      --shadow-hover: 0 4px 20px rgba(0,0,0,0.1);
      --font-sans: 'Inter', -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --transition-base: 0.3s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.75;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    .grid-container {
      max-width: 1200px;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航 */
    .site-header {
      background: #FFFFFF;
      height: 80px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 50;
      width: 100%;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 20px;
      letter-spacing: 0.05em;
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      gap: 10px;
      white-space: nowrap;
    }

    .logo span {
      color: var(--accent-gold);
      font-weight: 400;
      font-size: 14px;
      letter-spacing: 0.02em;
      border-left: 1px solid var(--accent-gold);
      padding-left: 10px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-body);
      transition: color 0.2s;
      position: relative;
      padding: 4px 0;
    }

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

    .nav-links a.active {
      color: var(--primary-dark);
      border-bottom: 2px solid var(--accent-gold);
    }

    .btn-primary {
      background: var(--accent-gold);
      color: #FFFFFF;
      font-weight: 600;
      font-size: 14px;
      letter-spacing: 0.04em;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      display: inline-block;
      transition: background 0.25s ease;
      border: none;
      cursor: pointer;
      text-align: center;
    }

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

    .btn-ghost {
      color: var(--primary-dark);
      font-weight: 500;
      border-bottom: 1px solid var(--accent-gold);
      padding-bottom: 2px;
      transition: opacity 0.2s;
    }

    .btn-ghost:hover {
      opacity: 0.8;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      width: 22px;
      height: 2px;
      background: var(--accent-gold);
      display: block;
    }

    /* Hero */
    .hero {
      background-color: var(--bg-warm);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 500px;
    }

    .hero-label {
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 0.1em;
      color: var(--accent-gold);
      text-transform: uppercase;
      margin-bottom: 16px;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -0.02em;
      color: var(--primary-dark);
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 16px;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 480px;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      gap: 24px;
      flex-wrap: wrap;
    }

    .hero-graphic {
      flex: 0 0 280px;
      opacity: 0.08;
      pointer-events: none;
    }

    .hero-graphic svg {
      width: 100%;
      height: auto;
    }

    /* 通用板块 */
    .section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 600;
      line-height: 1.25;
      color: var(--primary-dark);
      margin-bottom: 16px;
    }

    .section-sub {
      color: var(--text-muted);
      font-size: 16px;
      margin-bottom: 48px;
    }

    /* 痛点 */
    .pain-grid {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
      margin-top: 40px;
    }

    .pain-item {
      flex: 1 1 250px;
      border-left: 2px solid var(--accent-gold);
      padding-left: 24px;
    }

    .pain-item h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--primary-dark);
      margin-bottom: 8px;
    }

    /* 解决方案非对称 */
    .solution-layout {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
      margin-top: 32px;
    }

    .solution-main {
      flex: 2;
      background: var(--card-white);
      padding: 32px;
      box-shadow: var(--shadow-default);
      border-radius: var(--radius-card);
    }

    .solution-side {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .solution-card {
      background: var(--card-white);
      padding: 28px;
      box-shadow: var(--shadow-default);
      border-radius: var(--radius-card);
      border-left: 3px solid var(--accent-gold);
      transition: transform 0.3s cubic-bezier(0.25,0.46,0.45,0.94), box-shadow 0.3s;
    }

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

    /* 优势 Z 型 */
    .advantage-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
      flex-wrap: wrap;
    }

    .advantage-img {
      flex: 1 1 400px;
    }

    .advantage-img img {
      border-radius: 0;
      filter: grayscale(30%);
      transition: filter 0.4s;
    }

    .advantage-img img:hover {
      filter: grayscale(0%);
    }

    .advantage-text {
      flex: 1 1 300px;
    }

    /* 数据 */
    .stats-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 40px;
      margin-top: 40px;
    }

    .stat-item {
      text-align: left;
    }

    .stat-number {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.1;
      color: var(--accent-gold);
    }

    /* 证言 */
    .testimonial {
      background: var(--card-white);
      padding: 40px;
      box-shadow: var(--shadow-default);
      border-radius: var(--radius-card);
      margin-top: 32px;
    }

    .testimonial blockquote {
      font-size: 18px;
      color: var(--primary-dark);
      margin-bottom: 16px;
      position: relative;
      padding-left: 32px;
    }

    .testimonial blockquote::before {
      content: "“";
      font-size: 48px;
      color: var(--accent-gold);
      position: absolute;
      left: 0;
      top: -8px;
      line-height: 1;
    }

    /* FAQ */
    .accordion {
      background: transparent;
      border: none;
    }

    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }

    .accordion-title {
      font-size: 16px;
      font-weight: 500;
      color: var(--primary-dark);
      background: transparent;
      padding: 18px 0;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .accordion-title::after {
      content: "+";
      font-size: 20px;
      color: var(--accent-gold);
      transition: transform 0.3s;
    }

    .is-active .accordion-title::after {
      content: "−";
    }

    .accordion-content {
      padding: 0 0 20px;
      color: var(--text-body);
      font-size: 14px;
    }

    /* CTA 深色 */
    .cta-dark {
      background: var(--bg-dark);
      padding: 80px 0;
      text-align: center;
    }

    .cta-dark h2 {
      color: #FFFFFF;
      font-size: 36px;
      margin-bottom: 16px;
    }

    .cta-dark p {
      color: #B0B0B0;
      margin-bottom: 32px;
    }

    .btn-white {
      background: #FFFFFF;
      color: var(--primary-dark);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      margin: 0 10px;
    }

    /* 页脚 */
    .site-footer {
      background: var(--bg-dark);
      color: #B0B0B0;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 40px;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 18px;
      margin-bottom: 16px;
    }

    .footer-col a {
      display: block;
      color: #B0B0B0;
      margin-bottom: 8px;
      font-size: 14px;
    }

    .footer-bottom {
      border-top: 1px solid #3A3A3A;
      margin-top: 40px;
      padding-top: 20px;
      font-size: 12px;
      color: #6A6A6A;
    }

    @media (max-width: 1024px) {
      .hero h1 {
        font-size: 40px;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .hero {
        min-height: auto;
        padding: 80px 0;
      }
      .section {
        padding: 80px 0;
      }
      .section-title {
        font-size: 28px;
      }
      .hero h1 {
        font-size: 32px;
      }
      .solution-layout {
        flex-direction: column;
      }
      .stats-grid {
        gap: 24px;
      }
    }

    @media (max-width: 520px) {
      .hero-actions {
        flex-direction: column;
        align-items: flex-start;
      }
    }