/* roulang page: index */
:root {
      --red: #C41E3A;
      --red-deep: #A01830;
      --red-light-bg: #FFF0F0;
      --iron: #2D2D2D;
      --white-field: #F8F9FA;
      --white: #FFFFFF;
      --gold: #D4AF37;
      --gray-light: #EEEEEE;
      --gray-text: #6B7280;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.08);
      --shadow-hover: 0 12px 30px rgba(0, 0, 0, 0.15);
      --radius-card: 8px;
      --radius-btn: 4px;
      --max-width: 1280px;
      --transition: 0.3s ease;
      --font-heavy: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background: var(--white-field);
      color: var(--iron);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heavy);
      font-weight: 800;
      letter-spacing: -0.01em;
      line-height: 1.15;
      color: var(--iron);
      text-wrap: balance;
    }
    h1 { font-size: clamp(2.5rem, 8vw, 3.5rem); }
    h2 { font-size: clamp(2rem, 6vw, 2.625rem); }
    h3 { font-size: clamp(1.375rem, 3.5vw, 1.75rem); }
    a { text-decoration: none; color: inherit; }
    img { max-width: 100%; display: block; }

    /* 按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      letter-spacing: 0.3px;
      transition: var(--transition);
      cursor: pointer;
      border: 2px solid transparent;
      text-align: center;
      justify-content: center;
    }
    .btn-primary {
      background: var(--red);
      color: white;
      border-color: var(--red);
    }
    .btn-primary:hover { background: var(--red-deep); border-color: var(--red-deep); }
    .btn-outline {
      background: transparent;
      color: var(--red);
      border-color: var(--red);
    }
    .btn-outline:hover { background: var(--red-light-bg); }
    .btn-gold {
      background: var(--gold);
      color: var(--iron);
      border-color: var(--gold);
      font-weight: 900;
    }
    .btn-gold:hover { background: #c99e2e; border-color: #c99e2e; }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background var(--transition), backdrop-filter var(--transition);
      padding: 16px 0;
      background: transparent;
    }
    .site-header.scrolled {
      background: rgba(45, 45, 45, 0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-family: var(--font-heavy);
      font-weight: 900;
      font-size: 1.8rem;
      letter-spacing: 1px;
      color: white;
      display: flex;
      align-items: center;
      gap: 8px;
      transition: color var(--transition);
    }
    .site-header.scrolled .logo { color: white; }
    .logo-icon {
      font-size: 2rem;
      line-height: 1;
      filter: drop-shadow(0 0 6px rgba(212,175,55,0.6));
      color: var(--gold);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 30px;
      list-style: none;
      font-weight: 600;
      color: white;
      transition: color var(--transition);
    }
    .site-header.scrolled .nav-menu { color: #f0f0f0; }
    .nav-menu a {
      color: inherit;
      padding: 6px 0;
      position: relative;
      transition: color var(--transition);
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2.5px;
      background: var(--gold);
      transition: width var(--transition);
      border-radius: 2px;
    }
    .nav-menu a:hover { color: white; }
    .nav-menu a:hover::after { width: 100%; }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      display: block;
      width: 28px;
      height: 3px;
      background: white;
      transition: var(--transition);
      border-radius: 4px;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      inset: 0;
      background: var(--iron);
      z-index: 999;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      font-size: 1.8rem;
      font-weight: 700;
      color: white;
      list-style: none;
    }
    .mobile-menu.active { display: flex; }
    .mobile-menu a:hover { color: var(--gold); }

    /* hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(135deg, #2D2D2D 30%, #0b0b0b 100%);
      background-size: cover;
      background-position: center;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: white;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25;
      filter: blur(1.5px) brightness(0.7);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 850px;
      padding: 0 24px;
      animation: heroFade 1.2s cubic-bezier(0.16, 1, 0.3, 1);
    }
    @keyframes heroFade { 0% { opacity: 0; transform: translateY(25px); } 100% { opacity: 1; transform: translateY(0); }}
    .hero h1 {
      color: white;
      text-shadow: 0 4px 20px rgba(0,0,0,0.4);
      margin-bottom: 1rem;
    }
    .hero-sub {
      font-size: 1.3rem;
      font-weight: 400;
      color: rgba(255,255,255,0.88);
      margin-bottom: 2.5rem;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: center;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      animation: bounce 2s infinite;
      color: rgba(255,255,255,0.7);
      font-size: 2rem;
    }
    @keyframes bounce { 0%, 100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(12px); }}

    section { padding: 100px 0; }
    
    /* 痛点面板 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 50px;
    }
    .pain-card {
      background: #f2f2f2;
      border-radius: var(--radius-card);
      padding: 28px 24px;
      display: flex;
      gap: 16px;
      align-items: flex-start;
      transition: var(--transition);
      border-left: 4px solid transparent;
    }
    .pain-card:hover { border-left: 4px solid var(--red); background: white; box-shadow: var(--shadow-card); }
    .pain-icon {
      font-size: 2rem;
      opacity: 0.7;
      color: var(--red);
    }
    
    /* 解决方案非对称卡片 */
    .solution-row {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-bottom: 60px;
    }
    .solution-row.reverse { flex-direction: row-reverse; }
    .solution-img {
      flex: 1.2;
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      min-height: 320px;
      border-radius: 12px;
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .solution-img::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(196,30,58,0.35) 0%, transparent 70%);
    }
    .solution-text {
      flex: 1;
      padding-left: 10px;
    }
    .solution-list {
      list-style: none;
      margin-top: 18px;
    }
    .solution-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--iron);
      font-weight: 500;
    }
    .solution-list li::before {
      content: "✓";
      color: var(--red);
      font-weight: bold;
      font-size: 1.2rem;
    }

    /* 数据 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      margin-top: 40px;
    }
    .stat-number {
      font-size: 3.8rem;
      font-weight: 900;
      color: var(--gold);
    }

    /* 客户证言微纹理 */
    .testimonial-bg {
      background: #EBEBEB;
      background-image: radial-gradient(circle at 30% 30%, rgba(0,0,0,0.02) 1px, transparent 1px);
      background-size: 20px 20px;
    }
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 20px 0;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }
    .testimonial-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      min-width: 300px;
      max-width: 360px;
      display: flex;
      gap: 18px;
      align-items: flex-start;
      scroll-snap-align: start;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .testimonial-card blockquote {
      font-style: italic;
      color: var(--iron);
      margin: 0;
    }
    .avatar-placeholder {
      width: 52px;
      height: 52px;
      background: #d9d9d9;
      border-radius: 50%;
      flex-shrink: 0;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--gray-light);
      margin-bottom: 8px;
    }
    .faq-question {
      width: 100%;
      background: white;
      border: none;
      padding: 20px 8px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1.2rem;
      text-align: left;
      cursor: pointer;
      transition: background var(--transition);
    }
    .faq-question:hover { background: #f5f5f5; }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 10px;
    }
    .faq-answer p { padding-bottom: 18px; margin: 0; }
    .faq-item.open .faq-answer { max-height: 300px; }
    
    /* 最终 CTA */
    .cta-final {
      background: linear-gradient(145deg, var(--red) 10%, var(--iron) 90%);
      color: white;
      text-align: center;
    }
    
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.2fr 1.2fr;
      gap: 36px;
    }
    footer {
      background: var(--iron);
      color: #b0b0b0;
      padding-top: 60px;
      padding-bottom: 24px;
    }
    footer a:hover { color: var(--red); }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 45px;
      padding-top: 22px;
      text-align: center;
      font-size: 0.9rem;
    }

    @media (max-width: 980px) {
      .pain-grid, .solution-row, .stats-row { grid-template-columns: 1fr; flex-direction: column; }
      .solution-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .nav-menu { display: none; }
      .hamburger { display: flex; }
    }
    @media (max-width: 640px) {
      section { padding: 70px 0; }
      .footer-grid { grid-template-columns: 1fr; }
      .testimonial-scroll { flex-direction: column; }
      .hero h1 { font-size: 2.3rem; }
    }