/* roulang page: index */
:root {
      --gold: #D4A017;
      --black: #1A1A1A;
      --red: #C62828;
      --bg-light: #F7F7F7;
      --white: #FFFFFF;
      --text-dark: #111111;
      --text-body: #333333;
      --text-muted: #666666;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --transition-default: 0.25s ease;
      --container-max: 1280px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      scroll-padding-top: var(--nav-height);
    }
    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--white);
      color: var(--text-body);
      line-height: 1.8;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--text-dark);
      line-height: 1.3;
    }
    h1 {
      font-size: clamp(40px, 8vw, 56px);
      font-weight: 900;
      color: var(--gold);
    }
    h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }
    p {
      margin-bottom: 1.2rem;
      color: var(--text-body);
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: var(--transition-default);
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background-color: var(--black);
      color: var(--gold);
      z-index: 1000;
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-weight: 900;
      font-size: 1.6rem;
      letter-spacing: 1px;
      color: var(--gold);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      font-size: 1.8rem;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-link {
      color: var(--gold);
      font-weight: 500;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition-default);
      font-size: 1rem;
    }
    .nav-link:hover {
      border-bottom-color: var(--gold);
      color: #fff;
    }
    .btn-gold {
      background: var(--gold);
      color: var(--black);
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }
    .btn-gold:hover {
      background: var(--red);
      color: white;
      transform: translateY(-2px);
    }
    .btn-outline-gold {
      background: transparent;
      border: 2px solid var(--gold);
      color: var(--gold);
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-outline-gold:hover {
      background: var(--gold);
      color: var(--black);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 28px;
      height: 3px;
      background: var(--gold);
      border-radius: 2px;
      transition: 0.3s;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(0deg, rgba(26,26,26,0.8) 0%, rgba(26,26,26,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: white;
      position: relative;
      margin-top: 0;
      padding: 0 24px;
    }
    .hero-content {
      max-width: 800px;
      margin-top: 40px;
    }
    .hero h1 {
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 22px;
      color: rgba(255,255,255,0.9);
      margin-bottom: 36px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 56px;
    }
    .section-header h2 {
      color: var(--text-dark);
    }
    .section-header p {
      color: var(--text-muted);
      font-size: 18px;
      max-width: 700px;
      margin: 0 auto;
    }
    .bg-light {
      background-color: var(--bg-light);
    }
    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-default);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border: 1px solid var(--gold);
    }
    .card-icon {
      width: 56px;
      height: 56px;
      margin-bottom: 20px;
      border-radius: 12px;
      background: rgba(212,160,23,0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--gold);
      font-size: 28px;
    }
    /* 功能左右交替 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    .feature-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .feature-text {
      flex: 1;
    }
    .feature-text ul {
      list-style: none;
      margin-top: 20px;
    }
    .feature-text li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
      font-weight: 500;
    }
    .feature-text li i {
      color: var(--gold);
      font-size: 1.2rem;
    }
    /* 数据卡片 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-card {
      background: var(--bg-light);
      padding: 32px 16px;
      border-radius: 0;
      border-top: 4px solid var(--gold);
      background: var(--white);
      box-shadow: var(--shadow-sm);
    }
    .stat-number {
      font-size: 48px;
      font-weight: 900;
      color: var(--red);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-muted);
      font-weight: 500;
      margin-top: 8px;
    }
    /* 步骤条 */
    .steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }
    .step-item {
      flex: 1;
      text-align: center;
      position: relative;
    }
    .step-circle {
      width: 56px;
      height: 56px;
      background: var(--gold);
      color: var(--black);
      font-weight: 900;
      font-size: 24px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
    }
    .step-line {
      position: absolute;
      top: 28px;
      left: 70%;
      width: 60%;
      height: 2px;
      border-top: 2px dashed var(--gold);
      z-index: -1;
    }
    .step-item:last-child .step-line {
      display: none;
    }
    /* 案例卡片 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: var(--bg-light);
      border-radius: var(--radius-card);
      padding: 28px;
      border-left: 5px solid var(--gold);
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }
    .testimonial-avatar {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      background: #ddd;
      flex-shrink: 0;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: white;
      transition: 0.3s;
      border-left: 4px solid transparent;
    }
    .faq-item.active .faq-question {
      border-left-color: var(--gold);
      background: #fafafa;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 28px;
      background: #fafafa;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px 28px;
    }
    /* CTA */
    .cta-section {
      background: var(--black);
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    .cta-section h2 {
      color: var(--gold);
    }
    /* Footer */
    .footer {
      background: var(--black);
      color: #aaa;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 20px;
    }
    .footer a {
      display: block;
      color: #aaa;
      margin-bottom: 12px;
      transition: 0.2s;
    }
    .footer a:hover {
      color: var(--gold);
    }
    .copyright {
      border-top: 1px solid #333;
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .grid-3, .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .feature-row {
        flex-direction: column;
      }
      .feature-row.reverse {
        flex-direction: column;
      }
      .steps {
        flex-wrap: wrap;
      }
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: var(--black);
        flex-direction: column;
        padding: 32px;
        gap: 24px;
      }
      .nav-menu.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .grid-3, .testimonial-grid, .stats-grid {
        grid-template-columns: 1fr;
      }
      .hero h1 {
        font-size: 36px;
      }
      .steps {
        flex-direction: column;
        align-items: center;
      }
      .step-line {
        display: none;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }