/* roulang page: index */
:root {
      --primary-deep: #0F1A14;
      --primary-mid: #1A2A1F;
      --primary-light: #1E2E24;
      --card-bg: rgba(30, 46, 36, 0.85);
      --highlight-card: #243B2C;
      --copper: #C8A45C;
      --copper-dark: #A07D3E;
      --copper-light: rgba(200, 164, 92, 0.2);
      --text-light: #F5F0E8;
      --text-muted: #A8BFB0;
      --text-heading: #D4E5D9;
      --border-subtle: rgba(200, 164, 92, 0.15);
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 18px rgba(200, 164, 92, 0.5);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --transition-smooth: all 0.25s ease;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      background-color: var(--primary-deep);
      background-image: radial-gradient(circle at 30% 10%, rgba(26, 42, 31, 0.8) 0%, #0F1A14 90%);
      color: var(--text-muted);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    /* 背景纹理 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" opacity="0.03"><path d="M20 20 L30 15 L40 20 L35 30 L25 30 Z" fill="none" stroke="%23C8A45C" stroke-width="0.8"/><path d="M70 70 L80 65 L90 70 L85 80 L75 80 Z" fill="none" stroke="%23C8A45C" stroke-width="0.8"/></svg>');
      background-size: 180px 180px;
      pointer-events: none;
      z-index: 0;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
      position: relative;
      z-index: 2;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(15, 26, 20, 0.8);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(200, 164, 92, 0.2);
      z-index: 100;
      padding: 15px 0;
      transition: var(--transition-smooth);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--copper);
      letter-spacing: 0.5px;
      text-decoration: none;
      display: flex;
      align-items: baseline;
      gap: 4px;
    }
    .logo small {
      font-size: 1rem;
      font-weight: 400;
      color: var(--text-heading);
      margin-left: 4px;
    }

    .nav-chips {
      display: flex;
      gap: 10px;
      align-items: center;
      flex-wrap: wrap;
    }

    .nav-chip {
      background: transparent;
      border: 1px solid transparent;
      color: var(--text-muted);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 500;
      text-decoration: none;
      transition: var(--transition-smooth);
    }
    .nav-chip:hover {
      border-color: var(--copper);
      color: var(--copper);
    }
    .nav-chip.active {
      background: var(--copper);
      color: var(--primary-deep);
      font-weight: 600;
      border-color: var(--copper);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--copper), var(--copper-dark));
      color: var(--primary-deep);
      font-weight: 600;
      padding: 10px 26px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      border: none;
      cursor: pointer;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 12px rgba(200, 164, 92, 0.3);
      font-size: 0.95rem;
      display: inline-block;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: var(--shadow-glow);
      transform: translateY(-1px);
    }

    .btn-secondary {
      background: transparent;
      border: 1px solid var(--copper);
      color: var(--copper);
      padding: 10px 26px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      text-decoration: none;
      transition: var(--transition-smooth);
      display: inline-block;
    }
    .btn-secondary:hover {
      background: rgba(200, 164, 92, 0.1);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--copper);
      border-radius: 2px;
    }

    @media (max-width: 768px) {
      .nav-chips, .nav-cta-desktop {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .nav-container {
        padding: 0 20px;
      }
      .mobile-menu {
        display: none;
        flex-direction: column;
        background: rgba(15, 26, 20, 0.95);
        backdrop-filter: blur(20px);
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        padding: 20px;
        gap: 12px;
      }
      .mobile-menu.active {
        display: flex;
      }
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
      position: relative;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 600;
      color: var(--text-heading);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-desc {
      text-align: center;
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto 48px;
    }

    /* Hero */
    .hero {
      padding-top: 140px;
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left h1 {
      font-size: 3rem;
      font-weight: 700;
      background: linear-gradient(to right, #E0C87C, #C8A45C);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
      line-height: 1.3;
    }
    .hero-sub {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .hero-right {
      display: flex;
      flex-direction: column;
      gap: 20px;
      min-width: 280px;
    }
    .stat-card {
      background: var(--highlight-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 18px 20px;
      box-shadow: var(--shadow-card);
      backdrop-filter: blur(4px);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .stat-number {
      font-family: "Inter", "DIN Alternate", sans-serif;
      font-size: 2rem;
      font-weight: 700;
      color: var(--copper);
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
        padding-top: 120px;
      }
      .hero-left h1 {
        font-size: 2.2rem;
      }
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-item {
      background: var(--card-bg);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      text-align: center;
      transition: var(--transition-smooth);
    }
    .metric-item:hover {
      transform: translateY(-5px);
      border-color: rgba(200,164,92,0.4);
    }
    .metric-big {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--copper);
      font-family: "Inter", sans-serif;
    }
    @media (max-width: 768px) {
      .metrics-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--card-bg);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--border-subtle);
      transition: var(--transition-smooth);
    }
    .service-card:hover {
      transform: translateY(-6px);
      border-color: rgba(200,164,92,0.5);
      box-shadow: 0 12px 28px rgba(0,0,0,0.5);
    }
    .service-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .service-card:hover .service-img {
      transform: scale(1.03);
    }
    .service-content {
      padding: 20px;
    }
    .service-content h3 {
      color: var(--text-light);
      font-size: 1.3rem;
      margin-bottom: 8px;
    }
    .text-link {
      color: var(--copper);
      text-decoration: none;
      font-weight: 500;
      border-bottom: 1px solid transparent;
      transition: 0.2s;
    }
    .text-link:hover {
      border-bottom-color: var(--copper);
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比流程 */
    .compare-row {
      display: flex;
      gap: 40px;
      align-items: center;
    }
    .compare-col {
      flex: 1;
    }
    .list-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .compare-row {
        flex-direction: column;
      }
    }

    /* 数据证明 */
    .proof-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .proof-card {
      background: var(--card-bg);
      backdrop-filter: blur(8px);
      padding: 24px;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-subtle);
    }
    @media (max-width: 768px) {
      .proof-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 500;
      color: var(--text-heading);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #1A2A1F;
      padding: 0 24px;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      padding: 18px 24px;
    }

    /* CTA 表单 */
    .cta-form {
      max-width: 480px;
      margin: 0 auto;
      background: rgba(30,46,36,0.7);
      backdrop-filter: blur(12px);
      padding: 40px;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-subtle);
      box-shadow: 0 0 30px rgba(200,164,92,0.1);
    }
    .input-field {
      width: 100%;
      padding: 14px;
      background: #1A2A1F;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-btn);
      color: white;
      margin-bottom: 20px;
      transition: 0.2s;
    }
    .input-field:focus {
      outline: none;
      border-color: var(--copper);
      box-shadow: 0 0 10px rgba(200,164,92,0.3);
    }
    .btn-full {
      width: 100%;
    }

    footer {
      background: #0A1410;
      border-top: 1px solid var(--copper);
      padding: 40px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .container {
        padding: 0 20px;
      }
    }