/* roulang page: index */
:root {
      --primary: #1E3A2F;
      --primary-soft: rgba(30, 58, 47, 0.08);
      --accent-orange: #E85D3A;
      --accent-amber: #F7B32B;
      --bg-warm: #F9FAF7;
      --card-bg: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-mid: #5C6B63;
      --border-soft: #E6EBE5;
      --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.03), 0 1px 3px rgba(0,0,0,0.02);
      --shadow-card: 0 8px 24px rgba(0,0,0,0.04), 0 2px 6px rgba(0,0,0,0.02);
      --shadow-hover: 0 16px 32px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.02);
      --radius-lg: 24px;
      --radius-md: 20px;
      --radius-sm: 12px;
      --radius-pill: 40px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, 'Segoe UI', sans-serif;
      --font-number: "Inter", "PingFang SC", sans-serif;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    
    body {
      font-family: var(--font-sans);
      background: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      padding-bottom: 80px; /* space for mobile bottom nav */
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.3s ease;
    }
    
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航 - 桌面端 */
    .main-nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      height: 72px;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-soft);
      display: flex;
      align-items: center;
      transition: all 0.25s;
    }
    
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    
    .logo {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.3px;
      color: var(--primary);
      display: flex;
      align-items: center;
    }
    .logo span {
      color: var(--accent-orange);
      margin-left: 4px;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-mid);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s ease;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover:after {
      width: 100%;
    }
    
    .btn-primary-nav {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-pill);
      padding: 10px 24px;
      font-weight: 600;
      font-size: 0.95rem;
      transition: 0.3s ease;
      box-shadow: 0 4px 12px rgba(30,58,47,0.18);
    }
    .btn-primary-nav:hover {
      background: #152A22;
      box-shadow: 0 8px 20px rgba(30,58,47,0.3);
      transform: translateY(-1px);
      color: white;
    }
    
    .nav-toggle {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: none;
      border: none;
    }
    .nav-toggle span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    
    /* 移动端底座导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 12px;
      left: 16px;
      right: 16px;
      z-index: 110;
      background: white;
      border-radius: 28px;
      padding: 8px 24px;
      box-shadow: 0 8px 28px rgba(0,0,0,0.1);
      justify-content: space-around;
      align-items: center;
      height: 64px;
      backdrop-filter: blur(8px);
    }
    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      font-weight: 600;
      color: var(--text-mid);
      gap: 4px;
    }
    .mobile-bottom-nav a.active {
      color: var(--primary);
      font-weight: 700;
    }
    
    /* Hero */
    .hero-section {
      padding-top: 120px;
      padding-bottom: 60px;
      background: linear-gradient(135deg, #1E3A2F 0%, #0F2419 100%);
      position: relative;
      overflow: hidden;
      color: white;
      margin-bottom: 0;
      min-height: 520px;
    }
    .hero-section::before {
      content: "";
      position: absolute;
      top: -20%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle at center, rgba(247, 179, 43, 0.18) 0%, transparent 70%);
      border-radius: 50%;
    }
    .hero-flex {
      display: flex;
      align-items: center;
      gap: 50px;
      position: relative;
    }
    .hero-text {
      flex: 1 1 50%;
    }
    .hero-text h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.125rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
      max-width: 90%;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-main {
      background: var(--primary);
      color: white;
      border-radius: 40px;
      padding: 14px 36px;
      font-weight: 600;
      font-size: 1rem;
      transition: all 0.3s;
      box-shadow: 0 8px 20px rgba(30,58,47,0.25);
      border: none;
    }
    .btn-main:hover {
      background: #152A22;
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      border-radius: 40px;
      padding: 14px 32px;
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
    }
    .hero-image {
      flex: 0.8 1 45%;
      position: relative;
    }
    .image-wrapper {
      background: #2a4a3a;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }
    .floating-badge {
      position: absolute;
      bottom: -12px;
      left: -12px;
      background: var(--accent-orange);
      color: white;
      width: 74px;
      height: 74px;
      border-radius: 50%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      box-shadow: 0 12px 24px rgba(232,93,58,0.4);
      animation: float 3s infinite ease-in-out;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-6px); }
      100% { transform: translateY(0); }
    }
    
    /* 板块通用 */
    .section {
      padding: 88px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-header h2 {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--text-dark);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    
    /* 卡片差异化 */
    .service-card {
      background: var(--card-bg);
      border-radius: 20px;
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .icon-box {
      width: 56px;
      height: 56px;
      border-radius: 12px;
      background: var(--primary-soft);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 1.8rem;
      color: var(--primary);
    }
    .badge-stat {
      background: var(--primary-soft);
      color: var(--primary);
      padding: 6px 14px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 0.85rem;
      display: inline-block;
      margin-top: 8px;
    }
    
    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-item {
      background: var(--primary-soft);
      border-radius: 16px;
      padding: 28px 12px;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent-orange);
    }
    
    /* 案例卡片 */
    .case-card {
      border-radius: 20px;
      overflow: hidden;
      background: white;
      box-shadow: var(--shadow-card);
    }
    .case-img {
      position: relative;
      height: 200px;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
      color: white;
      padding: 24px 16px;
      font-weight: 700;
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-soft);
      padding: 16px 0;
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      color: var(--text-dark);
    }
    
    /* CTA */
    .cta-block {
      background: linear-gradient(90deg, #E85D3A 0%, #F7B32B 100%);
      border-radius: 24px;
      padding: 48px 32px;
      text-align: center;
    }
    
    footer {
      background: #1A1A1A;
      color: #AAAAAA;
      padding: 40px 0 20px;
    }
    
    @media (max-width: 1024px) {
      .hero-flex { flex-direction: column; }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 767px) {
      .nav-links, .btn-primary-nav { display: none; }
      .nav-toggle { display: flex; }
      .mobile-bottom-nav { display: flex; }
      .grid-3, .stats-grid { grid-template-columns: 1fr; }
      .hero-text h1 { font-size: 2rem; }
      .section-header h2 { font-size: 1.7rem; }
      .hero-buttons { flex-direction: column; }
      .main-nav { background: rgba(255,255,255,0.97); }
    }