/* roulang page: index */
/* 自定义设计变量与全局样式 */
    :root {
      --deep-forest: #0B1A1A;
      --electric-cyan: #00E5A1;
      --amber-orange: #FF6B35;
      --bg-light: #F5F7FA;
      --card-white: #FFFFFF;
      --text-title: #0B1A1A;
      --text-body: #2C3E50;
      --text-muted: #7F8C8D;
      --border-light: #E8ECF0;
      --shadow-sm: 0px 8px 30px rgba(11,26,26,0.06);
      --shadow-hover: 0px 16px 40px rgba(11,26,26,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Inter", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      color: var(--text-title);
      font-weight: 600;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: 48px;
      line-height: 1.1;
      font-weight: 700;
    }

    h2 {
      font-size: 36px;
      line-height: 1.2;
      font-weight: 600;
    }

    h3 {
      font-size: 22px;
      line-height: 1.3;
      font-weight: 600;
    }

    p {
      margin-bottom: 16px;
    }

    .text-muted {
      color: var(--text-muted);
    }

    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 装饰线 */
    .section-title-line {
      display: inline-block;
      width: 40px;
      height: 3px;
      background-color: var(--electric-cyan);
      margin-bottom: 16px;
      transition: width 0.3s ease;
    }

    h2:hover .section-title-line {
      width: 80px;
    }

    /* 按钮系统 */
    .btn-primary {
      background-color: var(--amber-orange);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 600;
      display: inline-block;
      text-align: center;
      transition: all var(--transition-smooth);
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(255,107,53,0.2);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(255,107,53,0.3);
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid var(--electric-cyan);
      color: var(--electric-cyan);
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 600;
      display: inline-block;
      text-align: center;
      transition: all var(--transition-smooth);
      cursor: pointer;
    }

    .btn-secondary:hover {
      background-color: rgba(0,229,161,0.1);
      border-color: var(--electric-cyan);
      box-shadow: 0 0 12px rgba(0,229,161,0.3);
    }

    .text-link {
      color: var(--electric-cyan);
      text-decoration: none;
      font-weight: 500;
      position: relative;
      transition: color 0.2s;
    }

    .text-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      width: 0;
      height: 1.5px;
      background: var(--electric-cyan);
      transition: all 0.3s ease;
      transform: translateX(-50%);
    }

    .text-link:hover::after {
      width: 100%;
    }

    /* 卡片样式 */
    .advantage-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      border-left: 4px solid var(--electric-cyan);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-smooth);
      border: 1px solid var(--border-light);
      border-left: 4px solid var(--electric-cyan);
    }

    .advantage-card:hover {
      border-left-width: 8px;
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover), 0 0 20px rgba(0,229,161,0.15);
    }

    .case-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-smooth);
      border: 1px solid var(--border-light);
      break-inside: avoid;
      margin-bottom: 32px;
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0,229,161,0.5);
    }

    .case-card img {
      transition: transform 0.4s ease, filter 0.3s;
    }

    .case-card:hover img {
      transform: scale(1.03);
      filter: brightness(0.9);
    }

    /* 表格样式 */
    .compare-table th {
      background-color: var(--deep-forest);
      color: white;
      font-weight: 600;
      padding: 20px 16px;
    }

    .compare-table td {
      padding: 18px 16px;
      border-bottom: 1px solid var(--border-light);
    }

    .highlight-col {
      background-color: rgba(0,229,161,0.04);
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }

    .faq-question {
      cursor: pointer;
      padding: 24px 0;
      display: flex;
      align-items: center;
      gap: 16px;
      font-weight: 600;
      color: var(--text-title);
      transition: background 0.2s;
    }

    .faq-question:hover {
      background-color: #F8FAFB;
    }

    .faq-icon {
      color: var(--electric-cyan);
      font-size: 20px;
      transition: transform 0.3s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      padding-left: 40px;
      color: var(--text-body);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 24px;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 粒子背景模拟 */
    .hero-visual {
      background: radial-gradient(circle at 20% 30%, rgba(0,229,161,0.08) 0%, transparent 50%);
      position: relative;
    }

    .grid-particle {
      position: absolute;
      width: 100%;
      height: 100%;
      background-image: linear-gradient(rgba(0,229,161,0.1) 1px, transparent 1px), linear-gradient(90deg, rgba(0,229,161,0.1) 1px, transparent 1px);
      background-size: 30px 30px;
      animation: drift 20s infinite linear;
    }

    @keyframes drift {
      0% { transform: translate(0,0); }
      100% { transform: translate(30px, 30px); }
    }

    /* 滚动视差简单模拟 */
    .parallax-card {
      transition: transform 0.1s ease-out;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      h2 { font-size: 30px; }
    }

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .container-custom { padding-left: 20px; padding-right: 20px; }
    }