/* roulang page: index */
:root {
      --primary: #0F3D2E;
      --primary-soft: rgba(15, 61, 46, 0.08);
      --accent: #FF6F4C;
      --accent-hover: #E55A3A;
      --mustard: #F2C94C;
      --bg: #FAF9F7;
      --card-bg: #FFFFFF;
      --text-primary: #1E1E1E;
      --text-secondary: #4A4A4A;
      --border-light: #E8E6E1;
      --border-card: #E8E6E1;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 16px;
      --container-max: 1280px;
      --header-height: 72px;
      --transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", system-ui, -apple-system, sans-serif;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.7;
    }
    
    body {
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: transparent;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航 PC 固定顶部 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(10px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
      z-index: 50;
      display: flex;
      align-items: center;
      transition: background 0.2s;
    }
    
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    
    .logo {
      font-weight: 700;
      font-size: 28px;
      letter-spacing: -0.5px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      display: inline-block;
      width: 11px;
      height: 11px;
      background-color: var(--accent);
      border-radius: 2px;
      transform: rotate(45deg);
    }
    
    .nav-desktop {
      display: flex;
      gap: 36px;
      align-items: center;
    }
    
    .nav-link {
      font-weight: 500;
      font-size: 15px;
      color: var(--text-primary);
      position: relative;
      padding: 6px 0;
    }
    
    .nav-link::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 0%;
      height: 2px;
      background-color: var(--accent);
      transition: width var(--transition);
    }
    
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    
    /* 移动端底部胶囊导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 32px);
      max-width: 420px;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(14px);
      border-radius: 40px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.08);
      padding: 8px 12px;
      z-index: 55;
      justify-content: space-around;
      align-items: center;
      border: 1px solid rgba(255,255,255,0.5);
    }
    
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 11px;
      font-weight: 500;
      color: var(--text-secondary);
      gap: 4px;
      padding: 6px 10px;
      border-radius: 24px;
      transition: var(--transition);
    }
    
    .mobile-nav-item i {
      font-size: 18px;
      color: inherit;
    }
    
    .mobile-nav-item.active {
      color: var(--accent);
      background: rgba(255,111,76,0.08);
      font-weight: 600;
    }
    
    /* 板块间距 */
    section {
      padding: 110px 0;
      scroll-margin-top: var(--header-height);
    }
    
    /* Hero 90vh 最小高度 */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background-color: var(--primary);
      color: white;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 30%;
      background-attachment: fixed;
      opacity: 0.65;
      z-index: 0;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(15,61,46,0.8) 20%, rgba(15,61,46,0.5) 100%);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 3;
      max-width: 720px;
      padding: 0 24px;
    }
    .hero h1 {
      font-weight: 800;
      font-size: clamp(42px, 8vw, 70px);
      letter-spacing: -0.02em;
      line-height: 1.15;
      margin-bottom: 24px;
      color: white;
    }
    .hero-sub {
      font-size: 20px;
      font-weight: 400;
      margin-bottom: 40px;
      opacity: 0.9;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 16px;
      transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
      text-decoration: none;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      box-shadow: 0 8px 18px rgba(255,111,76,0.25);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--primary-soft);
    }
    .hero .btn-outline {
      border-color: white;
      color: white;
    }
    .hero .btn-outline:hover {
      background: rgba(255,255,255,0.08);
    }
    
    /* 痛点 */
    .pain-text {
      max-width: 700px;
      margin: 0 auto;
      text-align: center;
      font-size: 18px;
      color: var(--text-secondary);
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    
    /* 解决方案非对称 */
    .solution-grid {
      display: flex;
      flex-direction: column;
      gap: 80px;
      margin-top: 56px;
    }
    .solution-item {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
    }
    .solution-item.reverse {
      grid-template-columns: 7fr 5fr;
    }
    .solution-img {
      background: #ddd;
      border-radius: var(--radius-sm);
      overflow: hidden;
      filter: grayscale(30%);
      transition: filter 0.35s;
    }
    .solution-img img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    .solution-img:hover {
      filter: grayscale(0%);
    }
    .solution-text h3 {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--primary);
    }
    
    /* 结果数字 */
    .results-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 30px;
      margin-top: 40px;
    }
    .stat-number {
      font-size: 64px;
      font-weight: 700;
      color: var(--mustard);
      line-height: 1.2;
    }
    
    /* 证言 */
    .testimonials-scroll {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .testimonial-card {
      background: var(--white);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-sm);
      padding: 28px;
      position: relative;
    }
    .testimonial-card::before {
      content: "“";
      font-size: 36px;
      color: var(--accent);
      position: absolute;
      top: 12px;
      left: 20px;
      opacity: 0.8;
    }
    
    /* FAQ */
    .faq-list {
      max-width: 780px;
      margin: 40px auto 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      width: 100%;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    
    /* 最终CTA背景 */
    .cta-final {
      background: linear-gradient(rgba(15,61,46,0.8),rgba(15,61,46,0.9)), url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      color: white;
    }
    
    footer {
      background: #1E1E1E;
      color: #aaa;
      padding: 32px 0;
    }
    
    @media (max-width: 768px) {
      .header {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      section {
        padding: 80px 0;
        scroll-margin-top: 24px;
      }
      .hero {
        min-height: 88vh;
      }
      .solution-item, .solution-item.reverse {
        grid-template-columns: 1fr;
      }
      .testimonials-scroll {
        grid-template-columns: 1fr;
      }
    }