/* roulang page: index */
:root {
      --primary-orange: #F15A24;
      --primary-orange-hover: #D94E1E;
      --secondary-black: #1A1A1A;
      --accent-cyan: #00B4D8;
      --bg-gray: #F7F8FA;
      --card-white: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-gray: #4A4A4A;
      --text-light-gray: #8A8A8A;
      --border-light: #E5E7EB;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(241,90,36,0.12);
      --radius-card: 12px;
      --radius-button: 12px;
      --radius-input: 8px;
      --transition: 0.25s ease;
      --font-family: 'Noto Sans SC', sans-serif;
      --max-width: 1280px;
    }

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

    body {
      font-family: var(--font-family);
      line-height: 1.6;
      background-color: var(--bg-gray);
      color: var(--text-dark);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    img { max-width: 100%; height: auto; display: block; }
    a { text-decoration: none; color: inherit; }
    button, input, textarea { font-family: inherit; }
    .container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

    /* 导航栏 */
    .site-header {
      position: sticky; top: 0; z-index: 100; background: var(--card-white);
      height: 72px; border-bottom: 1px solid rgba(0,0,0,0.04);
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
    }
    .header-inner {
      display: flex; align-items: center; justify-content: space-between;
      height: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
    }
    .logo a {
      display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 1.6rem;
      color: var(--secondary-black); letter-spacing: -0.5px;
    }
    .logo-icon {
      width: 36px; height: 36px; background: var(--primary-orange); border-radius: 50%;
      display: flex; align-items: center; justify-content: center; color: white; font-size: 1.4rem;
    }
    .nav-links { display: flex; align-items: center; gap: 32px; list-style: none; }
    .nav-links a {
      font-weight: 500; color: var(--secondary-black); position: relative;
      padding: 8px 0; transition: color var(--transition);
    }
    .nav-links a:hover, .nav-links a.active { color: var(--primary-orange); }
    .nav-links a::after {
      content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
      width: 0; height: 3px; background: var(--primary-orange); border-radius: 2px;
      transition: width var(--transition);
    }
    .nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
    .btn-primary {
      background: var(--primary-orange); color: white; border: none;
      border-radius: var(--radius-button); padding: 10px 24px; font-weight: 600;
      cursor: pointer; transition: all var(--transition); display: inline-block;
      font-size: 0.95rem; letter-spacing: 0.3px; box-shadow: 0 4px 12px rgba(241,90,36,0.2);
    }
    .btn-primary:hover { background: var(--primary-orange-hover); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(241,90,36,0.3); }
    .btn-outline {
      background: transparent; border: 2px solid var(--primary-orange); color: var(--primary-orange);
      border-radius: var(--radius-button); padding: 10px 24px; font-weight: 600;
      cursor: pointer; transition: all var(--transition); display: inline-block; font-size: 0.95rem;
    }
    .btn-outline:hover { background: rgba(241,90,36,0.08); transform: translateY(-2px); }
    .hamburger { display: none; background: none; border: none; font-size: 1.8rem; color: var(--secondary-black); cursor: pointer; }

    /* Hero */
    .hero {
      min-height: 85vh; display: flex; align-items: center; position: relative;
      background: var(--bg-gray); overflow: hidden; padding: 80px 0;
    }
    .hero-bg-lines {
      position: absolute; right: 0; bottom: 0; width: 70%; height: 70%;
      background: radial-gradient(circle at 30% 40%, rgba(241,90,36,0.04) 0%, transparent 60%);
      pointer-events: none;
    }
    .hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; position: relative; z-index: 2; }
    .hero-title { font-size: 3rem; font-weight: 800; line-height: 1.2; color: var(--secondary-black); margin-bottom: 20px; }
    .hero-sub { font-size: 1.2rem; color: var(--text-gray); margin-bottom: 32px; line-height: 1.5; }
    .hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
    .hero-dashboard {
      background: var(--secondary-black); border-radius: 24px; padding: 28px; color: white;
      box-shadow: 0 20px 40px rgba(0,0,0,0.15); min-height: 320px;
    }
    .dashboard-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .dash-card {
      background: rgba(255,255,255,0.06); border-radius: 16px; padding: 16px;
      backdrop-filter: blur(2px);
    }
    .dash-label { font-size: 0.85rem; color: var(--text-light-gray); }
    .dash-value { font-size: 2rem; font-weight: 800; color: var(--primary-orange); line-height: 1.2; font-feature-settings: "tnum"; }
    .dash-trend { display: flex; align-items: center; gap: 4px; font-size: 0.9rem; color: var(--accent-cyan); margin-top: 4px; }
    .dash-chart { height: 60px; background: linear-gradient(90deg, rgba(0,180,216,0.3) 0%, rgba(241,90,36,0.4) 80%); border-radius: 8px; margin-top: 12px; }

    /* 通用区块 */
    .section { padding: 100px 0; }
    .section-title { font-size: 2.25rem; font-weight: 700; text-align: center; margin-bottom: 16px; color: var(--secondary-black); }
    .section-subtitle { text-align: center; color: var(--text-gray); max-width: 600px; margin: 0 auto 48px; font-size: 1.1rem; }
    .decor-line {
      width: 60px; height: 4px; background: var(--primary-orange); margin: 0 auto 24px;
      border-radius: 2px;
    }

    /* 数据看板 */
    .data-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .data-card {
      background: var(--card-white); border-radius: var(--radius-card); padding: 28px 24px;
      box-shadow: var(--shadow-sm); transition: all var(--transition); position: relative;
    }
    .data-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
    .data-icon { font-size: 1.8rem; color: var(--accent-cyan); margin-bottom: 12px; }
    .data-number { font-size: 2.5rem; font-weight: 800; color: var(--primary-orange); font-feature-settings: "tnum"; line-height: 1.2; }
    .data-label { color: var(--text-gray); font-size: 0.95rem; margin-top: 8px; }
    .data-trend { display: inline-flex; align-items: center; gap: 6px; font-size: 0.9rem; margin-top: 12px; font-weight: 600; }
    .trend-up { color: var(--accent-cyan); }
    .trend-down { color: #E15554; }

    /* 服务卡片 */
    .services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .service-card {
      background: var(--card-white); border-radius: var(--radius-card); overflow: hidden;
      box-shadow: var(--shadow-sm); transition: all var(--transition);
    }
    .service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
    .service-img {
      height: 160px; background-size: cover; background-position: center;
      position: relative; background-color: #ddd;
    }
    .service-img::after {
      content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
      background: rgba(241,90,36,0.15);
    }
    .service-body { padding: 24px; }
    .service-body h3 { font-size: 1.4rem; font-weight: 600; margin-bottom: 8px; color: var(--secondary-black); }
    .service-body p { color: var(--text-gray); font-size: 0.95rem; margin-bottom: 16px; }
    .text-link { color: var(--primary-orange); font-weight: 600; display: inline-flex; align-items: center; gap: 4px; }
    .text-link:hover { text-decoration: underline; }

    /* 成效对比 */
    .compare-container {
      display: grid; grid-template-columns: 1fr auto 1fr; gap: 24px; align-items: center;
      background: var(--card-white); border-radius: 24px; padding: 40px; box-shadow: var(--shadow-sm);
    }
    .compare-side { padding: 16px; }
    .compare-before { color: var(--text-light-gray); }
    .compare-after { color: var(--secondary-black); font-weight: 600; }
    .compare-list { list-style: none; }
    .compare-list li { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; font-size: 1.1rem; }
    .compare-icon { width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; }
    .icon-before { background: #E5E7EB; color: #6B7280; }
    .icon-after { background: var(--primary-orange); color: white; }
    .compare-divider {
      display: flex; flex-direction: column; align-items: center; gap: 8px;
    }
    .divider-line { width: 4px; height: 60px; background: linear-gradient(to bottom, var(--primary-orange), var(--accent-cyan)); border-radius: 2px; }
    .divider-arrow { color: var(--primary-orange); font-size: 1.5rem; }

    /* FAQ */
    .faq-list { max-width: 800px; margin: 0 auto; }
    .faq-item { border-bottom: 1px solid var(--border-light); padding: 16px 0; }
    .faq-question {
      width: 100%; background: none; border: none; display: flex; justify-content: space-between;
      align-items: center; font-size: 1.1rem; font-weight: 600; color: var(--secondary-black);
      cursor: pointer; padding: 8px 0; text-align: left;
    }
    .faq-q-badge { background: var(--primary-orange); color: white; width: 28px; height: 28px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; font-size: 0.9rem; margin-right: 12px; flex-shrink: 0; }
    .faq-answer {
      max-height: 0; overflow: hidden; transition: max-height 0.3s ease; color: var(--text-gray);
      padding-left: 40px; font-size: 1rem;
    }
    .faq-answer.open { max-height: 200px; padding-top: 8px; padding-bottom: 8px; }
    .faq-toggle-icon { color: var(--primary-orange); font-size: 1.2rem; transition: transform 0.3s; }

    /* 联系表单 */
    .contact-section { background: var(--secondary-black); color: white; }
    .contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
    .form-group { margin-bottom: 20px; }
    .form-group input, .form-group textarea {
      width: 100%; padding: 14px; border-radius: var(--radius-input); border: 1px solid #444;
      background: white; font-size: 1rem; transition: all var(--transition);
    }
    .form-group input:focus, .form-group textarea:focus {
      outline: none; border-color: var(--accent-cyan); box-shadow: 0 0 0 3px rgba(0,180,216,0.4);
    }
    .btn-submit {
      width: 100%; background: var(--primary-orange); color: white; border: none;
      padding: 14px; border-radius: var(--radius-button); font-weight: 700; font-size: 1.1rem;
      cursor: pointer; transition: all var(--transition);
    }
    .btn-submit:hover { background: var(--accent-cyan); transform: translateY(-2px); }
    .trust-badges { display: flex; flex-direction: column; gap: 24px; }
    .badge-item { display: flex; align-items: center; gap: 16px; font-size: 1rem; }
    .badge-icon { font-size: 1.8rem; color: var(--accent-cyan); }

    /* 页脚 */
    .site-footer { background: var(--secondary-black); color: #B0B0B0; padding: 60px 0 0; }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
    .footer-brand p { margin-top: 12px; font-size: 0.9rem; }
    .footer-col h4 { color: white; font-weight: 600; margin-bottom: 16px; font-size: 1rem; }
    .footer-col ul { list-style: none; }
    .footer-col li { margin-bottom: 10px; }
    .footer-col a { color: #B0B0B0; transition: color var(--transition); font-size: 0.9rem; }
    .footer-col a:hover { color: var(--primary-orange); }
    .social-icons { display: flex; gap: 16px; margin-top: 8px; }
    .social-icons a {
      width: 40px; height: 40px; border: 1px solid #B0B0B0; border-radius: 50%;
      display: flex; align-items: center; justify-content: center; color: #B0B0B0;
      transition: all var(--transition);
    }
    .social-icons a:hover { background: var(--primary-orange); border-color: var(--primary-orange); color: white; }
    .footer-bottom { text-align: center; padding: 24px 0; border-top: 1px solid rgba(255,255,255,0.08); margin-top: 40px; font-size: 0.85rem; }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .hero-dashboard { margin-top: 32px; }
      .data-cards, .services-grid { grid-template-columns: 1fr 1fr; }
      .compare-container { grid-template-columns: 1fr; padding: 24px; }
      .compare-divider { flex-direction: row; }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; position: absolute; top: 72px; left: 0; width: 100%; background: var(--primary-orange); flex-direction: column; padding: 24px; gap: 20px; }
      .nav-links.active { display: flex; }
      .nav-links a { color: white; }
      .hamburger { display: block; }
      .data-cards, .services-grid { grid-template-columns: 1fr; }
      .hero-title { font-size: 2.2rem; }
      .section { padding: 60px 0; }
    }