/* roulang page: index */
:root {
      --primary: #6B4C3B;
      --secondary: #C8A97E;
      --bg: #FAF7F2;
      --dark-text: #2C2416;
      --muted-text: #7A6E5F;
      --accent: #A0523C;
      --card-bg: #FFFFFF;
      --chip-bg: #F0EBE3;
      --faq-bg: #F5F0E8;
      --border-light: rgba(44,36,22,0.08);
      --shadow-sm: 0 2px 12px rgba(44,36,22,0.06);
      --shadow-hover: 0 8px 24px rgba(44,36,22,0.10);
      --radius-card: 12px;
      --radius-btn: 6px;
      --radius-chip: 20px;
      --transition: all 0.25s ease;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--dark-text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { text-decoration: none; color: inherit; transition: var(--transition); }
    .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
    h1, h2, h3, h4 { font-family: var(--font-serif); color: var(--dark-text); }
    h2 { font-size: 2rem; font-weight: 600; margin-bottom: 1.5rem; position: relative; display: inline-block; }
    h2::after { content: ''; position: absolute; left: 0; bottom: -6px; width: 60%; height: 2px; background: var(--secondary); opacity: 0.8; }
    .text-muted { color: var(--muted-text); }
    .btn { display: inline-flex; align-items: center; justify-content: center; padding: 0.75rem 2rem; border-radius: var(--radius-btn); font-weight: 600; font-size: 1rem; cursor: pointer; transition: var(--transition); border: 2px solid transparent; }
    .btn-primary { background: var(--secondary); color: var(--dark-text); border-color: var(--secondary); }
    .btn-primary:hover { background: #b8956a; border-color: #b8956a; color: var(--dark-text); }
    .btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
    .btn-outline:hover { background: rgba(107,76,59,0.08); border-color: var(--primary); }
    .chip { display: inline-block; background: var(--chip-bg); color: var(--dark-text); border-radius: var(--radius-chip); padding: 0.35rem 1.2rem; font-size: 0.9rem; font-weight: 500; transition: var(--transition); }
    .chip.active, .chip:hover { background: var(--primary); color: #fff; }
    .card { background: var(--card-bg); border-radius: var(--radius-card); box-shadow: var(--shadow-sm); transition: var(--transition); padding: 2rem 1.5rem; }
    .card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
    .section { padding: 5rem 0; }
    @media (max-width: 1024px) {
      .section { padding: 4rem 0; }
      h2 { font-size: 1.8rem; }
    }
    @media (max-width: 640px) {
      .section { padding: 3rem 0; }
      h2 { font-size: 1.6rem; }
      .container { padding: 0 16px; }
    }
    /* 导航 */
    .header { position: fixed; top: 0; left: 0; width: 100%; z-index: 100; background: rgba(250,247,242,0.92); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border-light); transition: var(--transition); }
    .header.scrolled { box-shadow: 0 4px 12px rgba(44,36,22,0.05); }
    .nav-container { display: flex; align-items: center; justify-content: space-between; max-width: 1200px; margin: 0 auto; padding: 0.75rem 24px; }
    .logo { display: flex; align-items: center; gap: 0.5rem; font-family: var(--font-serif); font-size: 1.5rem; font-weight: 700; color: var(--primary); letter-spacing: 0.5px; }
    .logo i { font-size: 1.8rem; color: var(--secondary); }
    .nav-chips { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; }
    .nav-cta { margin-left: 1.5rem; }
    .hamburger { display: none; font-size: 1.8rem; color: var(--primary); cursor: pointer; }
    @media (max-width: 940px) {
      .nav-chips { display: none; position: absolute; top: 100%; left: 0; width: 100%; background: rgba(250,247,242,0.98); flex-direction: column; padding: 1.5rem; gap: 0.8rem; box-shadow: 0 8px 20px rgba(0,0,0,0.05); border-bottom: 1px solid var(--border-light); }
      .nav-chips.open { display: flex; }
      .hamburger { display: block; }
      .nav-cta { margin-left: auto; margin-right: 1rem; }
    }
    /* Hero */
    .hero { padding-top: 7rem; padding-bottom: 5rem; background-image: url('/assets/images/backpic/back-1.webp'); background-size: cover; background-position: center; position: relative; }
    .hero::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(250,247,242,0.7); backdrop-filter: blur(2px); }
    .hero .container { position: relative; z-index: 2; display: flex; align-items: center; gap: 2.5rem; }
    .hero-text { flex: 1 1 45%; }
    .hero-text h1 { font-size: 3rem; font-weight: 700; line-height: 1.2; margin-bottom: 1rem; }
    .hero-text .sub { font-size: 1.2rem; color: var(--muted-text); margin-bottom: 2rem; }
    .hero-buttons { display: flex; gap: 1rem; flex-wrap: wrap; }
    .hero-image { flex: 1 1 50%; }
    .hero-image img { border-radius: var(--radius-card); box-shadow: var(--shadow-hover); }
    @media (max-width: 768px) {
      .hero .container { flex-direction: column; text-align: center; }
      .hero-text h1 { font-size: 2.2rem; }
      .hero-buttons { justify-content: center; }
    }
    /* 优势卡片 */
    .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
    .icon-circle { width: 56px; height: 56px; background: rgba(107,76,59,0.1); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.6rem; color: var(--primary); margin-bottom: 1.2rem; }
    /* 功能图文 */
    .feature-row { display: flex; align-items: center; gap: 3rem; margin-bottom: 3rem; }
    .feature-row.reverse { flex-direction: row-reverse; }
    .feature-img { flex: 1 1 45%; }
    .feature-img img { border-radius: var(--radius-card); box-shadow: var(--shadow-sm); }
    .feature-content { flex: 1 1 50%; }
    @media (max-width: 768px) {
      .feature-row, .feature-row.reverse { flex-direction: column; }
      .grid-3 { grid-template-columns: 1fr; }
    }
    /* 场景卡片 */
    .scenario-card img { height: 200px; object-fit: cover; width: 100%; border-radius: var(--radius-card) var(--radius-card) 0 0; }
    .scenario-card .card { padding: 1.5rem; }
    /* 案例 */
    .case-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; }
    .case-stat { font-size: 2.2rem; font-weight: 700; color: var(--accent); }
    @media (max-width: 640px) { .case-grid { grid-template-columns: 1fr; } }
    /* 价格 */
    .pricing-grid { display: flex; gap: 2rem; justify-content: center; flex-wrap: wrap; }
    .price-card { background: var(--card-bg); border-radius: var(--radius-card); padding: 2.5rem 2rem; box-shadow: var(--shadow-sm); flex: 1 1 250px; max-width: 300px; text-align: center; transition: var(--transition); border: 2px solid transparent; }
    .price-card.featured { border-color: var(--secondary); transform: scale(1.03); }
    .price-num { font-size: 2.8rem; font-weight: 700; color: var(--primary); }
    .price-list { list-style: none; margin: 1.5rem 0; }
    .price-list li { padding: 0.4rem 0; color: var(--muted-text); }
    /* FAQ */
    .accordion-item { border-bottom: 1px solid var(--border-light); }
    .accordion-title { padding: 1rem 0; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
    .accordion-content { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; background: var(--faq-bg); padding: 0 1rem; border-radius: 0 0 8px 8px; }
    .accordion-item.active .accordion-content { max-height: 200px; padding: 1rem; }
    /* 底部CTA */
    .cta-bottom { background: var(--primary); color: #fff; text-align: center; padding: 4rem 0; }
    .cta-bottom h2 { color: #fff; }
    .cta-bottom h2::after { background: var(--secondary); }
    /* 页脚 */
    .footer { background: #2C2416; color: #C8A97E; padding: 3rem 0 1.5rem; }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem; }
    .footer a:hover { color: #fff; }
    @media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }