/* roulang page: index */
:root {
      --primary: #0A0F1E;
      --accent: #C8A96E;
      --accent-hover: #B8934A;
      --bg: #F8F6F1;
      --card-bg: #FFFFFF;
      --text-main: #1A1A1A;
      --text-secondary: #5C5C5C;
      --text-muted: #9A9A9A;
      --border-light: rgba(0,0,0,0.04);
      --border-accent: rgba(200,169,110,0.20);
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius: 10px;
      --nav-height: 64px;
      --container-max: 1200px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-number: 'DIN Alternate', 'PingFang SC', sans-serif;
    }
    * { margin:0; padding:0; box-sizing:border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--font-body);
      background: var(--bg);
      color: var(--text-main);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }
    img { max-width:100%; height:auto; display:block; }
    a { text-decoration:none; color:inherit; }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    #header {
      position: fixed;
      top:0; left:0; width:100%;
      height: var(--nav-height);
      display:flex; align-items:center;
      z-index: 1000;
      transition: background 0.25s ease, backdrop-filter 0.25s ease;
      background: transparent;
      backdrop-filter: blur(0px);
    }
    #header.scrolled {
      background: rgba(10,15,30,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }
    .nav-inner {
      display:flex; align-items:center; justify-content:space-between;
      width:100%; max-width:var(--container-max);
      margin:0 auto; padding:0 24px;
    }
    .logo {
      font-family: var(--font-title);
      font-weight: 700; font-size: 1.5rem;
      color: #FFFFFF;
      letter-spacing: 1px;
      display:flex; align-items:center; gap:6px;
    }
    .logo i { color: var(--accent); font-size: 1.6rem; }
    .nav-links { display:flex; gap: 28px; align-items:center; }
    .nav-links a {
      font-size: 0.95rem; font-weight: 500;
      color: #FFFFFF;
      transition: color 0.2s; position:relative;
      padding-bottom:4px;
    }
    .nav-links a::after {
      content:''; position:absolute; bottom:0; left:0; width:0; height:2px;
      background: var(--accent); transition: width 0.2s;
    }
    .nav-links a:hover { color: var(--accent); }
    .nav-links a:hover::after { width:100%; }
    .btn-nav {
      background: var(--accent); color: #0A0F1E !important;
      padding: 8px 20px; border-radius: 4px;
      font-weight: 600; margin-left: 8px;
      transition: background 0.2s, transform 0.2s;
    }
    .btn-nav:hover { background: var(--accent-hover); transform: scale(1.02); }
    .hamburger { display:none; font-size:1.8rem; color:#FFFFFF; cursor:pointer; }
    .mobile-menu {
      display:none; position:fixed; top:0; left:0; width:100%; height:100vh;
      background: rgba(10,15,30,0.98); backdrop-filter: blur(20px);
      flex-direction:column; align-items:center; justify-content:center;
      gap: 32px; z-index: 999;
    }
    .mobile-menu a { font-size:1.6rem; color:#FFFFFF; font-weight:500; }
    .mobile-menu .btn-nav { font-size:1.3rem; padding:12px 32px; }

    /* Hero */
    #hero {
      background: var(--primary);
      min-height: 100vh; display:flex; align-items:center;
      position:relative; overflow:hidden;
    }
    .hero-bg-img {
      position:absolute; inset:0;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.3;
    }
    .hero-content {
      position:relative; z-index:2;
      display:flex; align-items:center; gap:60px;
      width:100%; max-width:var(--container-max);
      margin:0 auto; padding:0 24px;
    }
    .hero-text { flex:1 1 55%; color:#FFFFFF; }
    .hero-text h1 {
      font-family: var(--font-title); font-weight: 700;
      font-size: 4rem; line-height: 1.2; margin-bottom: 20px;
      opacity:0; transform:translateY(24px); animation: fadeUp 0.7s forwards;
    }
    .hero-text .sub {
      font-size: 1.2rem; color: rgba(255,255,255,0.75);
      margin-bottom: 32px; opacity:0; transform:translateY(20px);
      animation: fadeUp 0.7s 0.15s forwards;
    }
    .btn-group { display:flex; gap:16px; flex-wrap:wrap; opacity:0; transform:translateY(20px); animation: fadeUp 0.7s 0.3s forwards; }
    .btn-primary {
      background: var(--accent); color: #0A0F1E;
      padding: 14px 36px; border-radius: 4px;
      font-weight: 700; font-size: 1rem;
      transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
      display:inline-block;
    }
    .btn-primary:hover { background: var(--accent-hover); transform: scale(1.03); box-shadow: var(--shadow-md); }
    .btn-outline {
      border: 1px solid var(--accent); color: #FFFFFF;
      padding: 14px 36px; border-radius: 4px;
      font-weight: 600; transition: 0.2s;
    }
    .btn-outline:hover { background: rgba(200,169,110,0.1); }
    .hero-visual {
      flex:1 1 45%; display:flex; justify-content:center;
      opacity:0; transform:translateY(30px); animation: fadeUp 0.8s 0.2s forwards;
    }
    .hero-visual img {
      max-height: 420px; border-radius: 16px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    @keyframes fadeUp { to { opacity:1; transform:translateY(0); } }

    /* 板块通用 */
    section { padding: 120px 0; }
    .section-title {
      font-family: var(--font-title); font-weight: 700;
      font-size: 2.4rem; margin-bottom: 16px; color: var(--primary);
    }
    .section-desc { color: var(--text-secondary); font-size: 1.1rem; max-width: 680px; }

    /* 痛点 */
    #pain-points { background: var(--card-bg); }
    .pain-grid { display:flex; gap:40px; margin-top:40px; flex-wrap:wrap; }
    .pain-item { flex:1; min-width:200px; }
    .pain-num { font-family: var(--font-number); font-size: 3rem; color: var(--accent); font-weight:700; }
    .pain-item p { color: var(--text-main); font-weight:500; margin-top:8px; }

    /* 解决方案 */
    #solution { background: var(--bg); }
    .solution-block { display:flex; gap:60px; align-items:center; margin-top:48px; flex-wrap:wrap; }
    .solution-visual { flex:1; }
    .solution-visual img { border-radius: var(--radius); box-shadow: var(--shadow-sm); }
    .solution-detail { flex:1; }
    .step-list { list-style:none; }
    .step-list li { display:flex; gap:18px; margin-bottom:28px; }
    .step-icon { font-size:2rem; color:var(--accent); min-width:40px; }

    /* 优势 */
    #advantages { background: var(--card-bg); }
    .adv-grid { display:grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top:48px; }
    .adv-main { grid-row: span 2; background: var(--bg); border-radius: var(--radius); overflow:hidden; display:flex; flex-direction:column; }
    .adv-main img { width:100%; height:240px; object-fit:cover; }
    .adv-content { padding: 28px; }
    .adv-small { background: var(--bg); border-radius: var(--radius); padding: 28px; display:flex; flex-direction:column; justify-content:center; }
    .adv-icon { font-size:2rem; color:var(--accent); margin-bottom:12px; }

    /* 数据 */
    #results { background: var(--bg); text-align:center; }
    .stats { display:flex; justify-content:center; gap:60px; flex-wrap:wrap; margin-top:48px; }
    .stat-item { }
    .stat-number { font-family: var(--font-number); font-size: 4rem; font-weight:700; color: var(--primary); }
    .stat-label { color: var(--text-secondary); margin-top:4px; }

    /* 证言 */
    #testimonials { background: var(--card-bg); }
    .testimonial-cards { display:flex; gap:48px; margin-top:48px; flex-wrap:wrap; }
    .testimonial { flex:1; position:relative; padding-left: 56px; }
    .testimonial .quote-mark { position:absolute; left:0; top:-10px; font-size:4rem; color:var(--accent); font-family: serif; }
    .testimonial blockquote { font-size:1.2rem; font-style:italic; color: var(--text-main); margin-bottom:16px; }

    /* FAQ */
    #faq { background: var(--bg); }
    .faq-list { max-width:800px; margin:40px auto 0; }
    .faq-item { border-bottom:1px solid rgba(0,0,0,0.06); padding: 18px 0; cursor:pointer; }
    .faq-q { font-weight:600; font-size:1.1rem; display:flex; justify-content:space-between; align-items:center; }
    .faq-arrow { transition:0.3s; }
    .faq-a { max-height:0; overflow:hidden; transition:max-height 0.4s ease; color:var(--text-secondary); }
    .faq-item.open .faq-a { max-height:200px; padding-top:12px; }
    .faq-item.open .faq-arrow { transform:rotate(180deg); }

    /* CTA */
    #cta { background: var(--primary); color:#FFFFFF; text-align:center; padding:100px 0; }
    #cta h2 { font-size:2.6rem; }
    #cta .btn-primary { margin-top:28px; }

    /* Footer */
    #footer { background: var(--primary); color: rgba(255,255,255,0.7); padding:60px 0 30px; }
    .footer-grid { display:flex; gap:40px; flex-wrap:wrap; margin-bottom:32px; }
    .footer-col { flex:1; }
    .footer-col h4 { color:#FFFFFF; margin-bottom:16px; }
    .footer-col a { display:block; margin-bottom:8px; color:rgba(255,255,255,0.65); }
    .footer-bottom { border-top:1px solid rgba(255,255,255,0.1); padding-top:24px; text-align:center; font-size:0.9rem; }

    /* 动画触发 */
    .fade-section { opacity:0; transform:translateY(30px); transition:0.6s ease; }
    .fade-section.visible { opacity:1; transform:translateY(0); }

    @media (max-width: 1024px) {
      .hero-content { flex-direction:column; text-align:center; }
      .hero-text h1 { font-size:3rem; }
    }
    @media (max-width: 768px) {
      .nav-links { display:none; }
      .hamburger { display:block; }
      .hero-text h1 { font-size:2.5rem; }
      .adv-grid { grid-template-columns:1fr; }
      .stats { gap:30px; }
      .container { padding:0 20px; }
      section { padding:80px 0; }
    }