/* roulang page: index */
/* ----- 设计变量与全局重置 ----- */
    :root {
      --primary-green: #2E8B57;
      --primary-green-dark: #236B45;
      --deep-black: #1A1A1A;
      --soft-white: #F9F9F7;
      --pure-white: #FFFFFF;
      --spring-pink: #FFB7C5;
      --summer-orange: #FF8C42;
      --autumn-gold: #D4A373;
      --winter-blue: #A8DADC;
      
      --text-primary: #1A1A1A;
      --text-secondary: #4A4A4A;
      --text-on-dark: #F0F0F0;
      --text-muted: #6B6B6B;
      
      --border-light: rgba(0,0,0,0.06);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.04);
      --shadow-card-hover: 0 16px 40px rgba(0, 0, 0, 0.08);
      --shadow-button: 0 4px 12px rgba(46, 139, 87, 0.25);
      
      --radius-sm: 12px;
      --radius-md: 20px;
      --radius-lg: 24px;
      --radius-xl: 32px;
      
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "SF Pro Display", sans-serif;
      
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --container-max: 1200px;
      --section-gap: 120px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--soft-white);
      color: var(--text-primary);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      font-weight: 600;
      border: none;
      outline: none;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    
    /* ----- 导航系统 (沉浸式透明→模糊) ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 16px 0;
      transition: background 0.4s ease, backdrop-filter 0.4s ease, padding 0.3s ease;
      background: transparent;
      backdrop-filter: blur(0px);
    }
    
    .site-header.scrolled {
      background: rgba(26, 26, 26, 0.88);
      backdrop-filter: blur(20px);
      padding: 12px 0;
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }
    
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: #FFFFFF;
      letter-spacing: -0.3px;
      transition: color 0.3s;
    }
    .logo-icon {
      font-size: 1.8rem;
      color: var(--primary-green);
      filter: drop-shadow(0 2px 6px rgba(0,0,0,0.3));
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      color: #FFFFFF;
      font-weight: 500;
    }
    .nav-links a {
      position: relative;
      padding: 6px 0;
      opacity: 0.9;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary-green);
      transition: width 0.3s ease;
    }
    .nav-links a:hover {
      opacity: 1;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .btn-nav-download {
      background: var(--primary-green);
      color: white;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      border: none;
      box-shadow: var(--shadow-button);
    }
    .btn-nav-download:hover {
      background: var(--primary-green-dark);
      transform: translateY(-2px);
    }
    
    .mobile-toggle {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    
    /* 移动端底部导航 (胶囊式) */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--pure-white);
      border-radius: 40px;
      padding: 8px 24px;
      box-shadow: 0 8px 30px rgba(0,0,0,0.12);
      z-index: 999;
      backdrop-filter: blur(12px);
      background: rgba(255,255,255,0.92);
      gap: 28px;
    }
    .mobile-bottom-nav a {
      color: var(--text-secondary);
      font-size: 1.3rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      font-weight: 600;
    }
    .mobile-bottom-nav a i {
      font-size: 1.4rem;
      margin-bottom: 2px;
    }
    .mobile-bottom-nav a.active {
      color: var(--primary-green);
    }
    
    /* ----- 板块通用 ----- */
    section {
      padding: var(--section-gap) 0;
    }
    
    .section-title {
      text-align: center;
      margin-bottom: 64px;
    }
    .section-title h2 {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--deep-black);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }
    .section-title p {
      color: var(--text-secondary);
      font-size: 1.1rem;
    }
    
    /* ----- Hero 首屏 ----- */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #1A3A2A 0%, #0F2318 40%, #1A1A1A 100%);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }
    .hero-bg-texture {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      position: relative;
      z-index: 2;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
    }
    .hero-right img {
      max-height: 550px;
      filter: drop-shadow(0 25px 50px rgba(0,0,0,0.5));
      animation: float 5s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }
    
    .hero-left h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }
    .hero-left .highlight {
      color: var(--primary-green);
      text-shadow: 0 0 20px rgba(46,139,87,0.6);
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 36px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-green);
      color: white;
      padding: 14px 36px;
      border-radius: 40px;
      font-size: 1rem;
      font-weight: 700;
      box-shadow: 0 8px 24px rgba(46,139,87,0.5);
    }
    .btn-primary:hover {
      background: var(--primary-green-dark);
      box-shadow: 0 12px 28px rgba(255,140,66,0.4);
      transform: translateY(-3px);
    }
    .btn-outline-light {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 600;
    }
    .btn-outline-light:hover {
      background: white;
      color: var(--deep-black);
    }
    
    /* 功能卡片网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--pure-white);
      border-radius: var(--radius-lg);
      padding: 36px 28px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease-out;
      border: 1px solid var(--border-light);
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-10px);
      box-shadow: 0 24px 48px rgba(46,139,87,0.12);
    }
    .feature-icon {
      font-size: 2.4rem;
      color: var(--primary-green);
      margin-bottom: 20px;
      background: rgba(46,139,87,0.08);
      width: 60px;
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 18px;
    }
    .feature-card h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
      font-weight: 700;
    }
    .badge-group {
      display: flex;
      gap: 10px;
      margin-top: 18px;
      flex-wrap: wrap;
    }
    .badge {
      background: rgba(168, 218, 220, 0.25);
      color: #1E5A5C;
      padding: 4px 12px;
      border-radius: 20px;
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 0.8rem;
    }
    
    /* 场景画廊 */
    .scenarios-grid {
      display: flex;
      flex-direction: column;
      gap: 40px;
    }
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      background: rgba(255,255,255,0.7);
      border-radius: 32px;
      padding: 24px;
      backdrop-filter: blur(4px);
    }
    .scenario-img {
      flex: 1 1 45%;
      border-radius: 24px;
      overflow: hidden;
    }
    .scenario-content {
      flex: 1 1 55%;
    }
    
    /* 数据墙 */
    .testimonials-data {
      background: #1E1E1E;
      color: white;
      border-radius: 40px;
      padding: 60px 40px;
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
      margin-top: 20px;
    }
    .data-badge-large {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--summer-orange);
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    details {
      background: white;
      border-radius: 20px;
      padding: 20px 28px;
      margin-bottom: 16px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
      transition: 0.2s;
    }
    summary {
      font-weight: 700;
      font-size: 1.1rem;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
    }
    
    /* CTA */
    .final-cta {
      background: linear-gradient(135deg, #1C3324, #0E1E14);
      text-align: center;
      color: white;
      padding: 100px 0;
    }
    
    /* Footer */
    .footer {
      background: #111;
      color: #ccc;
      padding: 60px 0 20px;
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-toggle { display: block; }
      .mobile-bottom-nav { display: flex; }
      .hero-grid { flex-direction: column; text-align: center; }
      .hero-left h1 { font-size: 2.4rem; }
      .features-grid { grid-template-columns: 1fr; }
      .scenario-row { flex-direction: column; }
      .testimonials-data { flex-direction: column; }
      section { padding: 80px 0; }
    }