/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary: #0B5E3C;
      --primary-light: #0e7349;
      --primary-dark: #094e32;
      --accent: #F5A623;
      --accent-hover: #E0910E;
      --accent-light: rgba(245,166,35,0.12);
      --bg-light: #F9FAF7;
      --bg-dark: #1E2F2C;
      --text-primary: #1C2826;
      --text-secondary: #5A6E6A;
      --text-on-dark: #B7C5C1;
      --card-bg: #FFFFFF;
      --border-light: #E3EAE6;
      --border-input: #DDE5E1;
      --shadow-sm: 0 2px 8px rgba(11,94,60,0.04);
      --shadow-card: 0 4px 16px rgba(11,94,60,0.07);
      --shadow-hover: 0 8px 32px rgba(11,94,60,0.13);
      --shadow-nav: 0 2px 20px rgba(0,0,0,0.06);
      --radius-xs: 6px;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --transition-base: 0.25s ease;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-body);
      color: var(--text-primary);
      background-color: #FFFFFF;
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    ul {
      list-style: none;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

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

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.25s ease, box-shadow 0.25s ease, padding 0.2s;
      padding: 16px 0;
      background: transparent;
    }

    .header.scrolled {
      background: #FFFFFF;
      box-shadow: var(--shadow-nav);
      padding: 12px 0;
    }

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

    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 22px;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 8px;
      transition: color 0.25s;
      white-space: nowrap;
    }
    .logo i {
      font-size: 26px;
      color: var(--accent);
      transition: color 0.25s;
    }
    .header.scrolled .logo {
      color: var(--text-primary);
    }
    .header.scrolled .logo i {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: rgba(255,255,255,0.9);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
      transition: color 0.25s;
      white-space: nowrap;
    }
    .header.scrolled .nav-links a {
      color: var(--text-primary);
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-links a.active {
      color: var(--accent);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 100%;
      height: 2px;
      background: var(--accent);
    }

    .cta-btn {
      background: var(--accent);
      color: #fff;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      border: none;
      font-size: 15px;
      letter-spacing: 0.5px;
      transition: background 0.3s, box-shadow 0.3s, transform 0.2s;
      box-shadow: 0 4px 12px rgba(245,166,35,0.3);
    }
    .cta-btn:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 20px rgba(245,166,35,0.4);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: #fff;
      transition: color 0.2s;
      cursor: pointer;
      padding: 4px;
      line-height: 1;
    }
    .header.scrolled .hamburger {
      color: var(--text-primary);
    }

    @media (max-width: 767px) {
      .hamburger {
        display: block;
      }
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-dark);
        flex-direction: column;
        padding: 90px 32px 40px;
        gap: 28px;
        transition: right 0.35s ease;
        box-shadow: -8px 0 30px rgba(0,0,0,0.25);
        z-index: 999;
      }
      .nav-links.open {
        right: 0;
      }
      .nav-links a {
        color: #fff;
        font-size: 18px;
        font-weight: 500;
      }
      .nav-links a.active {
        color: var(--accent);
      }
      .header .cta-btn {
        margin-right: 12px;
        padding: 10px 20px;
        font-size: 14px;
      }
      .overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.5);
        z-index: 998;
      }
      .overlay.show {
        display: block;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(160deg, #0B5E3C 0%, #094e32 45%, #1E2F2C 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      display: flex;
      align-items: center;
      color: #fff;
      position: relative;
      padding: 120px 0 80px;
      overflow: hidden;
    }
    .hero-content {
      position: relative;
      max-width: 680px;
      z-index: 2;
    }
    .hero h1 {
      font-family: var(--font-heading);
      font-size: clamp(36px, 5.4vw, 54px);
      font-weight: 700;
      line-height: 1.25;
      margin-bottom: 20px;
      color: #ffffff;
    }
    .hero .subhead {
      font-size: clamp(16px, 2.2vw, 19px);
      opacity: 0.92;
      margin-bottom: 36px;
      max-width: 540px;
      line-height: 1.6;
    }
    .hero-actions {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .ghost-btn {
      background: transparent;
      border: 2px solid rgba(255,255,255,0.8);
      color: #fff;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      transition: all 0.25s;
    }
    .ghost-btn:hover {
      background: rgba(255,255,255,0.12);
      border-color: #fff;
    }
    .ball-animation {
      position: absolute;
      right: 60px;
      bottom: 60px; 
      width: 90px;
      height: 90px;
      border-radius: 50%;
      background: radial-gradient(circle at 30% 30%, #F5A623, #c07a1a);
      animation: bounce 2.2s infinite alternate ease-in-out;
     &box-shadow: 0 20px 30px rgba(0,0,0,0.35);
    }
    @keyframes bounce {
      0% { transform: translateY(0); }
      100% { transform: translateY(-28px); }
    }
    @media (max-width:768px) {
      .ball-animation{display:none;}
      .hero{padding:140px 0 60px;}
    }

    /* sections */
    .section-padding {
      padding: 110px 0;
      background-color: var(--bg-light);
    }
    .section-dark {
      background-color: #FFFFFF;
    }
    .section-title {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: clamp(28px,4vw,38px);
      text-align: center;
      color: var(--text-primary);
      margin-bottom: 14px;
    }
    .section-sub {
      text-align: center;
      color: var(--text-secondary);
      max-width: 610px;
      margin: 0 auto 56px;
      font-size: 17px;
    }

    .grid-3, .grid-4, .grid-2 {
      display: grid;
      gap: 32px;
      align-items: start;
    }
    .grid-3 { grid-template-columns: repeat(3,1fr); }
    .grid-4 { grid-template-columns: repeat(3,1fr); }
    .grid-2 { grid-template-columns: repeat(2,1fr); }
    @media (max-width:1023px) {
      .grid-3,.grid-4 {grid-template-columns: repeat(2,1fr);}
    }
    @media (max-width:680px) {
      .grid-3,.grid-4,.grid-2 {grid-template-columns:1fr;}
    }

    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 36px 28px 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      text-align: start;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 68px; height: 68px;
      border-radius: var(--radius-sm);
      background: #E9F4EE;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 22px;
      font-size: 32px;
      color: var(--primary);
    }
    .feature-card h4 {
      font-family: var(--font-heading);
      font-size: 22px;
      margin-bottom: 12px;
    }

    .scene-card {
      background: #fff;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: 0.25s;
    }
    .scene-card:hover { box-shadow: var(--shadow-hover); }
    .scene-img {
      width: 100%;
      height: 190px;
      object-fit: cover;
      filter: brightness(0.95);
    }
    .scene-text { padding: 22px 20px 20px; }
    .scene-text h4 { font-weight: 700; }

    .stat-row {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 60px;
      text-align: center;
    }
    .stat-value {
      font-size: 48px;
      font-weight:700;
      color: var(--accent);
      line-height: 1.2;
    }

    .price-card {
      background: #fff;
      padding: 36px 28px;
      border-radius: var(--raidus-md);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      text-align: center;
      transition: 0.3s;
      position: relative;
    }
    .price-card.popular {
      border-color: var(--accent);
      box-shadow: 0 0 0 1px var(--accent);
    }
    .badge {
      position: absolute;
      top: 20px;
      right: 22px;
      background: var(--accent);
      color: #000;
      font-weight: 700;
      padding: 5px 12px;
      border-radius: 20px;
      font-size: 13px;
      background: #F5A623;
      color:#fff;
    }

    .faq-list {
      max-width: 820px;
      margin:0 auto;
    }
    details.faq-item {
      background: var(--bg-light);
      border-radius: var(--radius-sm);
      padding: 20px 24px;
      margin-bottom: 14px;
      transition: 0.2s;
      border-left:0px solid transparent;
    }
    details[open] {
      background: #fff;
      border-left: 4px solid var(--accent);
      box-shadow: 0 4px 16px rgba(0,0,0,0.04);
    }
    summary {
      font-weight: 700;
      font-size: 18px;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
    }
    summary::after{content:'\f078'; font-family:'Font Awesome 6 Free';font-weight:600; }
    details[open] summary::after{ content:'\f077'; }

    .cta-dark {
      background: var(--bg-dark);
      text-align: center;
      padding: 80px 20px;
      color:#fff;
    }
    .footer {
      background: #1E2F2C;
      color: var(--text-on-dark);
      padding: 64px 0 28px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 48px;
    }
    @media(max-width:800px){.footer-grid{grid-template-columns:1fr;}}
    .footer a:hover{color:var(--accent)}
    .footer-bottom{border-top:1px solid rgba(255,255,255,0.1); margin-top:40px; padding-top:22px;}