/* roulang page: index */
:root {
      --primary-deep: #1A1A1A;
      --accent-gold: #C8A96E;
      --bg-light: #FAFAFA;
      --card-white: #FFFFFF;
      --dark-bg: #2C2C2C;
      --text-title: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #8C8C8C;
      --text-on-dark: #FFFFFF;
      --border-light: #E5E5E5;
      --border-subtle: #EEEEEE;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-sm: 8px;
      --radius-btn: 6px;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      color: var(--text-title);
      font-weight: 600;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .top-nav {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 100;
      height: 70px;
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      height: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .logo span {
      color: var(--accent-gold);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--primary-deep);
      font-weight: 500;
      text-decoration: none;
      font-size: 16px;
      position: relative;
      padding: 4px 0;
      transition: color 0.3s;
    }
    .nav-links a:hover {
      color: var(--accent-gold);
    }
    .nav-links a.active {
      color: var(--accent-gold);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.3s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .mega-trigger {
      cursor: pointer;
      font-weight: 500;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 6px;
      position: relative;
    }
    .mega-trigger i {
      transition: transform 0.2s;
    }
    .mega-panel {
      position: absolute;
      top: 70px;
      right: 20px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-radius: 12px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.06);
      padding: 24px;
      display: none;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      width: 360px;
      z-index: 101;
    }
    .mega-trigger:hover .mega-panel,
    .mega-panel:hover {
      display: grid;
    }
    .mega-item {
      background: #FFFFFF;
      border-radius: 8px;
      padding: 12px;
      display: flex;
      align-items: center;
      gap: 12px;
      transition: background 0.2s;
      text-decoration: none;
      color: var(--text-body);
    }
    .mega-item:hover {
      background: #F7F5F0;
    }
    .mega-item i {
      color: var(--accent-gold);
      font-size: 20px;
      width: 24px;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--primary-deep);
    }
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        display: none;
        flex-direction: column;
        background: #FFFFFF;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .mobile-menu a {
        padding: 16px 24px;
        border-bottom: 1px solid #f0f0f0;
        color: var(--primary-deep);
      }
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1.2;
      height: 420px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 20px;
      box-shadow: var(--shadow-sm);
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-deep);
      color: #FFFFFF;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      transition: background 0.25s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--accent-gold);
      color: #fff;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      transition: all 0.25s;
      text-decoration: none;
    }
    .btn-outline:hover {
      border-color: var(--accent-gold);
      color: var(--accent-gold);
    }
    .stats {
      display: flex;
      gap: 40px;
      margin-top: 40px;
    }
    .stat-item h3 {
      font-size: 28px;
      color: var(--accent-gold);
      margin-bottom: 4px;
    }
    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
        padding: 100px 0 60px;
      }
      .hero h1 {
        font-size: 32px;
      }
      .hero-right {
        height: 260px;
        width: 100%;
      }
      .stats {
        gap: 20px;
      }
    }
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    /* 服务标签切换 */
    .service-tabs {
      display: flex;
      gap: 0;
      margin-top: 40px;
    }
    .tab-nav {
      width: 200px;
      display: flex;
      flex-direction: column;
      border-right: 1px solid #EEEEEE;
    }
    .tab-nav button {
      background: none;
      border: none;
      text-align: left;
      padding: 16px 20px;
      font-size: 16px;
      color: var(--text-body);
      cursor: pointer;
      transition: 0.2s;
      position: relative;
    }
    .tab-nav button.active {
      color: var(--primary-deep);
      font-weight: 600;
      border-left: 3px solid var(--accent-gold);
    }
    .tab-content {
      flex: 1;
      padding: 16px 32px;
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .tab-content img {
      width: 180px;
      border-radius: 12px;
    }
    @media (max-width: 768px) {
      .service-tabs {
        flex-direction: column;
      }
      .tab-nav {
        width: 100%;
        flex-direction: row;
        overflow-x: auto;
        border-right: none;
      }
      .tab-content {
        flex-direction: column;
        padding: 16px 0;
      }
    }
    /* 场景卡片 */
    .scenario-card {
      display: flex;
      background: #F9F9F9;
      border-radius: var(--radius-card);
      margin-bottom: 32px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
    }
    .scenario-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .scenario-img {
      width: 45%;
      background-size: cover;
      background-position: center;
    }
    .scenario-text {
      padding: 32px;
    }
    @media (max-width: 768px) {
      .scenario-card {
        flex-direction: column;
      }
      .scenario-img {
        width: 100%;
        height: 200px;
      }
    }
    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .case-card {
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      height: 320px;
      background-size: cover;
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 24px;
      background: linear-gradient(transparent, rgba(0,0,0,0.7));
      color: #fff;
    }
    @media (max-width: 768px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid #EEEEEE;
    }
    .accordion-title {
      background: #FFFFFF;
      padding: 20px 24px;
      font-weight: 500;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      transition: 0.2s;
    }
    .accordion-title:hover {
      color: var(--accent-gold);
    }
    .accordion-content {
      padding: 0 24px 20px;
      display: none;
      background: #f9f9f9;
    }
    .cta-banner {
      background: var(--dark-bg);
      color: #fff;
      padding: 72px 24px;
      text-align: center;
    }
    footer {
      background: #2C2C2C;
      color: #B0B0B0;
      padding: 60px 0 30px;
      border-top: 2px solid var(--accent-gold);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      section {
        padding: 60px 0;
      }
    }