/* roulang page: index */
:root {
      --primary-deep: #1E2D2F;
      --accent-gold: #C49A6C;
      --accent-gold-hover: #A87D52;
      --bg-warm: #FAF8F5;
      --bg-light-gray: #F3F0EB;
      --white: #FFFFFF;
      --text-heading: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #7A7A7A;
      --border-light: #E8E3DC;
      --border-input: #DCD5CE;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 8px;
      --transition: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "Segoe UI", system-ui, sans-serif;
      --max-width: 1200px;
      --nav-height: 72px;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: var(--nav-height);
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

    button, input {
      font-family: inherit;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background-color: var(--white);
      box-shadow: 0 1px 6px rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
    }
    .logo span {
      color: var(--accent-gold);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-menu a {
      font-size: 15px;
      color: var(--text-body);
      padding: 8px 0;
      position: relative;
      font-weight: 500;
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--accent-gold);
      transition: width var(--transition);
    }

    .nav-menu a:hover {
      color: var(--accent-gold);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }

    .btn-primary {
      background-color: var(--accent-gold);
      color: var(--white);
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background-color var(--transition), transform var(--transition);
      white-space: nowrap;
    }
    .btn-primary:hover {
      background-color: var(--accent-gold-hover);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-outline:hover {
      background-color: rgba(196,154,108,0.08);
      border-color: var(--accent-gold-hover);
      color: var(--accent-gold-hover);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary-deep);
      border-radius: 2px;
      transition: all var(--transition);
    }

    /* Hero */
    .hero-section {
      padding: calc(var(--nav-height) + 60px) 0 80px;
      background: linear-gradient(135deg, var(--bg-warm) 0%, #F0ECE6 100%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-right {
      flex: 0 0 45%;
      background-color: var(--primary-deep);
      border-radius: 24px;
      min-height: 420px;
      position: relative;
      overflow: hidden;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(30,45,47,0.7) 0%, rgba(30,45,47,0.3) 100%);
    }
    .hero-right .overlay-lines {
      position: absolute;
      top: 20px;
      right: 20px;
      bottom: 20px;
      left: 20px;
      border: 1px solid rgba(196,154,108,0.25);
      border-radius: 16px;
      z-index: 2;
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-heading);
      letter-spacing: -0.5px;
      margin-bottom: 16px;
    }
    h1 .gold {
      color: var(--accent-gold);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 540px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    /* 通用板块 */
    .section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 600;
      line-height: 1.3;
      color: var(--text-heading);
      margin-bottom: 16px;
      text-align: center;
    }
    .title-decor {
      width: 40px;
      height: 2px;
      background-color: var(--accent-gold);
      margin: 0 auto 48px;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition);
      cursor: default;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background-color: rgba(196,154,108,0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      color: var(--accent-gold);
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-heading);
      margin-bottom: 12px;
    }
    .service-card p {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 数据优势 */
    .stats-section {
      background-color: var(--bg-light-gray);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 42px;
      font-weight: 700;
      color: var(--accent-gold);
      margin-bottom: 8px;
    }
    .stat-label {
      font-size: 16px;
      color: var(--text-body);
    }

    /* 流程 */
    .steps-grid {
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      gap: 16px;
    }
    .step-item {
      flex: 1;
      text-align: center;
      position: relative;
    }
    .step-circle {
      width: 40px;
      height: 40px;
      background: var(--accent-gold);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px;
      font-size: 18px;
    }
    .step-title {
      font-weight: 600;
      font-size: 18px;
      color: var(--text-heading);
      margin-bottom: 8px;
    }
    .step-desc {
      font-size: 14px;
      color: var(--text-muted);
    }
    .step-connector {
      display: none;
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      height: 320px;
      border-radius: var(--radius-card);
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: flex-end;
      transition: transform var(--transition);
    }
    .case-card:hover {
      transform: scale(1.02);
    }
    .case-card::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(to top, var(--primary-deep) 0%, transparent 60%);
    }
    .case-info {
      position: relative;
      z-index: 2;
      padding: 24px;
      width: 100%;
    }
    .case-badge {
      background: var(--accent-gold);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .case-title {
      color: white;
      font-size: 20px;
      font-weight: 600;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      padding: 20px 0;
      font-weight: 600;
      font-size: 18px;
      color: var(--text-heading);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-icon {
      color: var(--accent-gold);
      font-size: 20px;
    }

    /* CTA */
    .cta-section {
      background: var(--primary-deep);
      text-align: center;
      padding: 90px 0;
    }
    .cta-title {
      color: white;
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .cta-desc {
      color: rgba(255,255,255,0.7);
      margin-bottom: 32px;
    }
    .cta-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .cta-form {
      display: flex;
      gap: 12px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .cta-form input {
      padding: 12px 16px;
      border-radius: var(--radius-input);
      border: 1px solid var(--border-input);
      background: white;
      min-width: 180px;
      outline: none;
      transition: border var(--transition);
    }
    .cta-form input:focus {
      border-color: var(--accent-gold);
      box-shadow: 0 0 0 3px rgba(196,154,108,0.15);
    }

    /* 页脚 */
    .footer {
      background: var(--primary-deep);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }
    .footer a {
      color: rgba(255,255,255,0.7);
    }
    .footer a:hover {
      color: var(--accent-gold);
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 8px;
    }
    .qr-placeholder {
      width: 80px;
      height: 80px;
      background: rgba(255,255,255,0.15);
      margin-bottom: 8px;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.2);
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: rgba(255,255,255,0.4);
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .cases-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .hero-left, .hero-right { flex: auto; width: 100%; }
      .hero-right { min-height: 280px; }
      h1 { font-size: 32px; }
      .services-grid { grid-template-columns: 1fr; }
      .cases-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .steps-grid { flex-direction: column; align-items: center; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .cta-form { flex-direction: column; align-items: center; }
    }