/* roulang page: index */
:root {
      --bs-primary: #0ABF9E;
      --primary-color: #0ABF9E;
      --secondary-dark: #1A1F24;
      --bg-warm: #F7F5F2;
      --card-white: #FFFFFF;
      --accent-amber: #F5A623;
      --text-title: #1A1F24;
      --text-body: #4A5056;
      --text-muted: #8D949C;
      --border-light: rgba(0,0,0,0.04);
      --border-input: #D1CFC9;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-chip: 24px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      margin: 0;
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, h5, h6 {
      color: var(--text-title);
      font-weight: 600;
    }

    a {
      text-decoration: none;
      color: var(--primary-color);
      transition: color 0.2s;
    }
    a:hover {
      color: #0a9e84;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1030;
      transition: background 0.3s, backdrop-filter 0.3s;
      background: transparent;
      backdrop-filter: none;
    }
    .navbar-custom.scrolled {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 26px;
      color: var(--secondary-dark);
      display: flex;
      align-items: center;
    }
    .navbar-brand i {
      color: var(--primary-color);
      margin-right: 8px;
      font-size: 28px;
    }
    .nav-chip {
      background: transparent;
      border: none;
      padding: 6px 16px;
      border-radius: var(--radius-chip);
      font-weight: 500;
      color: var(--text-body);
      transition: all 0.25s;
      font-size: 15px;
      margin: 0 2px;
    }
    .nav-chip:hover, .nav-chip.active {
      background: rgba(10,191,158,0.1);
      color: var(--primary-color);
    }
    .btn-primary-custom {
      background: var(--primary-color);
      border: none;
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      color: white;
      transition: all 0.25s ease;
      box-shadow: none;
    }
    .btn-primary-custom:hover {
      background: #0a9e84;
      transform: translateY(-2px);
      color: white;
      box-shadow: 0 8px 18px rgba(10,191,158,0.25);
    }
    .btn-outline-primary-custom {
      border: 1px solid var(--primary-color);
      color: var(--primary-color);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      transition: 0.25s ease;
    }
    .btn-outline-primary-custom:hover {
      background: rgba(10,191,158,0.05);
      transform: translateY(-2px);
      color: var(--primary-color);
    }

    /* 首屏 */
    .hero-section {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(180deg, #F7F5F2 0%, #FFFFFF 100%);
      padding-top: 80px;
      margin-bottom: 40px;
    }
    .hero-title {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--secondary-dark);
    }
    .hero-title span {
      color: var(--primary-color);
    }
    .hero-sub {
      font-size: 20px;
      color: var(--text-body);
      margin: 24px 0 16px;
    }

    /* 区块间距 */
    section {
      padding: 120px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
      .hero-title {
        font-size: 36px;
      }
    }

    .section-title {
      font-size: 40px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .section-desc {
      color: var(--text-body);
      font-size: 18px;
      margin-bottom: 48px;
    }

    /* 卡片 */
    .feature-card {
      background: var(--card-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
      height: 100%;
      display: flex;
      align-items: flex-start;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 32px;
      color: var(--primary-color);
      margin-right: 24px;
      min-width: 40px;
    }
    .solution-row {
      margin-bottom: 80px;
      align-items: center;
    }
    .solution-img {
      background: #e9ecef;
      border-radius: var(--radius-card);
      width: 100%;
      height: 300px;
      object-fit: cover;
      box-shadow: var(--shadow-sm);
    }
    .scenario-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--border-light);
      transition: 0.3s;
    }
    .scenario-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .scenario-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: 0.3s;
    }
    .scenario-card:hover img {
      transform: scale(1.03);
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
      height: 100%;
      position: relative;
    }
    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .case-quote {
      font-size: 32px;
      font-weight: 700;
      color: var(--accent-amber);
    }
    .faq-item {
      border-bottom: 1px solid #E8E6E1;
      background: white;
      border-radius: 0;
    }
    .faq-question {
      font-weight: 600;
      color: var(--secondary-dark);
      cursor: pointer;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-icon {
      color: var(--primary-color);
      transition: 0.3s;
    }
    .cta-section {
      background: var(--secondary-dark);
      color: white;
      padding: 100px 0;
      text-align: center;
      border-radius: 0;
    }
    .cta-section h2 {
      color: white;
    }
    .footer-dark {
      background: #1A1F24;
      color: #8D949C;
      padding: 60px 0 30px;
    }
    .footer-dark a {
      color: #8D949C;
    }
    .footer-dark a:hover {
      color: var(--primary-color);
    }
    .social-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      border-radius: 50%;
      border: 1px solid #4A5056;
      color: #8D949C;
      margin-right: 10px;
      transition: 0.2s;
    }
    .social-icon:hover {
      background: var(--primary-color);
      border-color: var(--primary-color);
      color: white;
    }

    @media (max-width: 992px) {
      .navbar-collapse {
        background: rgba(255,255,255,0.95);
        backdrop-filter: blur(10px);
        padding: 20px;
        border-radius: 12px;
      }
    }