/* roulang page: index */
/* 设计变量与基础重置 */
    :root {
      --primary: #0D7C6B;
      --primary-light: #0F8B7A;
      --primary-deep: #0A5E50;
      --accent: #F59E0B;
      --accent-hover: #D98C0A;
      --bg: #F9F8F6;
      --card-bg: #FFFFFF;
      --charcoal: #1E2A2A;
      --stone: #5F6B6A;
      --border-light: #E5E7EB;
      --text-on-dark: #F0F2EC;
      --shadow-sm: 0 4px 10px rgba(0,0,0,0.03);
      --shadow-md: 0 6px 22px rgba(0,0,0,0.05);
      --shadow-lg: 0 15px 35px rgba(0,0,0,0.07);
      --shadow-glow-accent: 0 4px 18px rgba(245, 158, 11, 0.35);
      --radius-sm: 8px;
      --radius-card: 14px;
      --radius-btn: 50px;
      --radius-input: 8px;
      --transition: 0.25s cubic-bezier(0.2, 0.9, 0.4, 1);
      --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-num: "Inter", "SF Pro Display", var(--font-sans);
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background: var(--bg);
      color: var(--charcoal);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 排版规范 */
    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--charcoal);
    }

    h1 {
      font-size: clamp(2.3rem, 6vw, 3.2rem);
      line-height: 1.2;
      letter-spacing: -0.02em;
      font-weight: 800;
    }

    h2 {
      font-size: clamp(1.8rem, 4.5vw, 2.5rem);
      line-height: 1.3;
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 1.4rem;
      line-height: 1.5;
      margin-bottom: 0.6rem;
    }

    p, .text-body {
      font-size: 1rem;
      color: var(--stone);
      margin-bottom: 1.2rem;
    }

    .highlight {
      color: var(--primary);
      font-weight: 700;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      outline: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.4rem;
      font-weight: 600;
      transition: all var(--transition);
      text-align: center;
    }

    /* 导航 NAV */
    .site-header {
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      padding: 1rem 0;
    }

    .site-header.scrolled {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 6px 18px rgba(0,0,0,0.04);
      padding: 0.7rem 0;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: nowrap;
    }

    .logo {
      font-size: 1.7rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.1rem;
      list-style: none;
    }

    .nav-links a {
      font-weight: 550;
      font-size: 0.95rem;
      color: var(--charcoal);
      position: relative;
      white-space: nowrap;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      left: 0; bottom: -4px;
      width: 0;
      height: 2.5px;
      background: var(--primary);
      transition: width var(--transition);
      border-radius: 2px;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .btn-cta-nav {
      background: var(--accent);
      color: #1a1a1a;
      border-radius: var(--radius-btn);
      padding: 0.6rem 1.8rem;
      font-weight: 700;
      font-size: 0.9rem;
      box-shadow: 0 4px 12px rgba(245,158,11,0.3);
      margin-left: 0.8rem;
    }
    .btn-cta-nav:hover {
      background: var(--accent-hover);
      transform: scale(1.02);
      box-shadow: 0 6px 16px rgba(245,158,11,0.45);
    }

    .menu-toggle {
      display: none;
      font-size: 1.4rem;
      color: var(--primary);
      background: transparent;
      padding: 0.4rem;
    }

    /* 移动端导航 */
    @media (max-width: 860px) {
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(18px);
        flex-direction: column;
        align-items: flex-start;
        padding: 4rem 2rem;
        transition: right 0.3s ease;
        box-shadow: -8px 0 28px rgba(0,0,0,0.1);
        gap: 1.8rem;
        display: flex;
      }
      .nav-menu.active {
        right: 0;
      }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.6rem;
      }
      .btn-cta-nav {
        margin-left: 0;
        width: 100%;
        justify-content: center;
      }
    }

    /* hero 背景图片设置 */
    .hero-wrapper {
      background: linear-gradient(180deg, #f0f6f2 0%, #eaf1ed 100%);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding-top: 6rem;
    }

    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 85vh;
      gap: 3rem;
      position: relative;
      backdrop-filter: blur(2px);
    }
    
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-right {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
      position: relative;
    }

    .abstract-graphic {
      width: 100%;
      aspect-ratio: 4/3;
      background: radial-gradient(circle at 30% 30%, rgba(13,124,107,0.35), transparent 60%),
                  radial-gradient(circle at 75% 60%, rgba(245,158,11,0.3), transparent 50%);
      border-radius: 30% 70% 50% 50% / 30% 40% 60% 70%;
      animation: floatShape 9s infinite alternate ease-in-out;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    }
    @keyframes floatShape {
      0% { border-radius: 31% 69% 52% 48% / 34% 42% 58% 66%; }
      100% { border-radius: 46% 54% 45% 55% / 42% 48% 52% 58%; }
    }

    .subheadline {
      font-size: 1.25rem;
      color: var(--stone);
      margin: 1.2rem 0 2rem;
      max-width: 580px;
    }

    /* 组件 */
    .section-padding {
      padding: 90px 0;
    }
    
    .grid-2x2, .grid-3x2 {
      display: grid;
      gap: 28px;
    }
    .grid-2x2 { grid-template-columns: repeat(2,1fr); }
    .grid-3col { grid-template-columns: repeat(3,1fr); }

    .card-pain {
      background: #F4F6FA;
      border-radius: var(--radius-card);
      padding: 2rem 1.6rem;
      box-shadow: none;
      border:1px solid transparent;
    }
    .card-pain:hover {
      box-shadow: var(--shadow-md);
      background: white;
      border-color: #eef2ea;
    }
    
    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
    }
    .solution-img {
      height: 200px;
      width: 100%;
      object-fit: cover;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 0.65rem 2rem;
    }
    .btn-filled {
      background: var(--accent);
      color: #0f1a1a;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2.4rem;
      font-weight: 700;
    }

    .stat-number {
      font-family: var(--font-num);
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary);
    }
    
    .faq-item {
      border-bottom:1px solid var(--border-light);
      padding: 1.1rem 0;
    }
    .faq-question {
      font-weight: 650;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color:var(--charcoal);
    }
    
    .cta-dark {
      background: linear-gradient(145deg, #0A5E50, #0D7C6B);
      border-radius: 1.5rem;
      color: white;
    }

    footer {
      background: var(--primary-deep);
      color: var(--text-on-dark);
    }
    
    @media (max-width: 768px) {
      .grid-2x2,.grid-3col { grid-template-columns: 1fr; }
      .hero-content { flex-direction: column; text-align: center; }
      .hero-right { margin-top:1.8rem; }
    }
    
    input, textarea {
      width: 100%;
      padding: 0.9rem 1rem;
      border:1px solid #d9dcd6;
      border-radius: var(--radius-input);
      background: white;
      font-family: var(--font-sans);
      margin-bottom: 0.9rem;
    }