/* roulang page: index */
:root {
      --primary: #0A7E3D;
      --primary-light: #0B8F47;
      --accent: #D4A843;
      --accent-light: #E8C96A;
      --dark-bg: #0F1419;
      --charcoal: #1B232C;
      --surface-light: #F5F7FA;
      --surface-warm: #EDF0F4;
      --text-primary: #1A1D22;
      --text-secondary: #5A6270;
      --white: #FFFFFF;
      --warning: #E85D3F;
      --border-light: #E2E6EC;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --shadow-premium: 0 8px 40px rgba(10,126,61,0.15);
      --shadow-premium-hover: 0 16px 48px rgba(10,126,61,0.22);
      --radius-xl: 24px;
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-xs: 10px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition: 0.25s ease;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--font-sans);
      color: var(--text-primary);
      background-color: var(--white);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img { max-width: 100%; display: block; }
    a { text-decoration: none; color: inherit; }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
    }
    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid transparent;
      transition: background 0.3s, box-shadow 0.3s, border-color 0.3s;
      height: 72px;
      display: flex;
      align-items: center;
    }
    .header.scrolled {
      background: rgba(255,255,255,0.96);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border-light);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      color: var(--text-primary);
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--accent), var(--primary));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 20px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-primary);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: color var(--transition), border-color var(--transition);
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: white;
      font-weight: 600;
      border: none;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      cursor: pointer;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 10px rgba(10,126,61,0.2);
      font-size: 16px;
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(10,126,61,0.3);
    }
    .btn-outline-gold {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      cursor: pointer;
      transition: all var(--transition);
      font-size: 16px;
    }
    .btn-outline-gold:hover {
      background: rgba(212,168,67,0.1);
    }
    .btn-light {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      cursor: pointer;
      transition: all var(--transition);
    }
    .btn-light:hover {
      background: white;
      color: var(--dark-bg);
    }
    .nav-cta {
      padding: 8px 20px;
      font-size: 14px;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-primary);
      transition: var(--transition);
    }
    @media (max-width: 1024px) {
      .nav-menu { gap: 20px; }
    }
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: rgba(15,20,25,0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        gap: 32px;
        transition: right 0.4s ease;
        z-index: 999;
      }
      .nav-menu.active {
        right: 0;
      }
      .nav-menu a {
        color: white;
        font-size: 20px;
      }
      .hamburger { display: flex; z-index: 1001; }
      .header { height: 60px; }
    }
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section { padding: 60px 0; }
    }
    h2 {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.3;
      color: var(--text-primary);
    }
    @media (max-width: 768px) {
      h2 { font-size: 30px; }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A2E1F 0%, #0F3D2E 30%, #0F1419 100%);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(212,168,67,0.15) 0%, transparent 50%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      color: white;
      max-width: 900px;
      margin: 0 auto;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero .subtitle {
      font-size: 20px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 40px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .badge-float {
      position: absolute;
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(10px);
      border-radius: 40px;
      padding: 12px 24px;
      color: white;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    @media (max-width: 768px) {
      .hero h1 { font-size: 34px; }
      .hero .subtitle { font-size: 16px; }
    }
    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .feature-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 40px 32px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: all var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-md);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: linear-gradient(135deg, var(--primary), #0B8F47);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 24px;
      color: white;
      font-size: 28px;
    }
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-img {
      flex: 1;
      border-radius: var(--radius-xl);
      overflow: hidden;
      aspect-ratio: 16/10;
      background: #ddd;
    }
    .scenario-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: center;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 40px 32px;
      border: 1px solid var(--border-light);
      text-align: center;
      transition: all var(--transition);
      position: relative;
    }
    .pricing-card.popular {
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-premium);
      transform: scale(1.03);
    }
    .popular-badge {
      background: var(--accent);
      color: white;
      border-radius: 40px;
      padding: 6px 20px;
      font-size: 14px;
      font-weight: 600;
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-xs);
      margin-bottom: 12px;
      background: white;
      transition: var(--transition);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      display: none;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer { display: block; }
    .footer {
      background: #1A1D22;
      color: #B0B8C1;
      padding: 60px 0 30px;
    }
    @media (max-width: 768px) {
      .grid-3, .pricing-grid { grid-template-columns: 1fr; }
      .scenario-row, .scenario-row.reverse { flex-direction: column; }
    }