/* roulang page: index */
:root {
      --primary: #2E8B3A;
      --primary-dark: #267A30;
      --accent-orange: #F59E0B;
      --accent-orange-dark: #E08F00;
      --bg-dark: #0F1A0F;
      --bg-dark-2: #1A2E1A;
      --bg-light: #FAF9F5;
      --bg-light-gray: #F0F4F0;
      --text-dark: #1A1A1A;
      --text-gray: #4A4A4A;
      --white: #FFFFFF;
      --border-light: #E0E4DF;
      --shadow-sm: 0 2px 12px rgba(15, 26, 15, 0.06);
      --shadow-md: 0 8px 24px rgba(15, 26, 15, 0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 50px;
      --transition: 0.2s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.75;
      font-size: 16px;
      scroll-behavior: smooth;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

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

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(15, 26, 15, 0.88);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s ease;
    }

    .header.scrolled {
      background: #0F1A0F;
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .logo i {
      color: var(--primary);
      font-size: 32px;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 15px;
      position: relative;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-orange);
      transition: width 0.25s ease;
    }

    .nav-links a:hover, .nav-links a.active {
      color: var(--accent-orange);
    }

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

    .btn-nav {
      background: var(--accent-orange);
      color: #0F1A0F !important;
      padding: 10px 24px;
      border-radius: 50px;
      font-weight: 700;
      letter-spacing: 0.5px;
      box-shadow: 0 4px 12px rgba(245,158,11,0.4);
    }

    .btn-nav:hover {
      background: var(--accent-orange-dark);
      transform: translateY(-1px);
    }

    .burger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: none;
      border: none;
    }
    .burger span {
      width: 24px;
      height: 2px;
      background: white;
      border-radius: 1px;
      transition: 0.3s;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0F1A0F 0%, #1A2E1A 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding: 100px 0 60px;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: repeating-linear-gradient(0deg, rgba(46,139,58,0.06) 0px, rgba(46,139,58,0.06) 1px, transparent 1px, transparent 40px), repeating-linear-gradient(90deg, rgba(46,139,58,0.04) 0px, rgba(46,139,58,0.04) 1px, transparent 1px, transparent 40px);
      pointer-events: none;
    }

    .hero .container {
      display: flex;
      align-items: center;
      gap: 40px;
      position: relative;
      z-index: 2;
    }

    .hero-text {
      flex: 1;
      color: white;
    }

    .hero-text h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-text .subtitle {
      font-size: 18px;
      opacity: 0.85;
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(46,139,58,0.5);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(46,139,58,0.14);
      transform: translateY(-2px);
    }

    .hero-image {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    .hero-image img {
      width: 100%;
      aspect-ratio: 4/3;
      object-fit: cover;
    }

    /* 通用区块 */
    section {
      padding: 80px 0;
    }
    .bg-light-alt {
      background-color: var(--bg-light-gray);
    }
    .section-title {
      font-size: 36px;
      font-weight: 600;
      text-align: center;
      margin-bottom: 24px;
    }
    .grid {
      display: grid;
      gap: 24px;
    }

    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border: 1px solid var(--border-light);
      height: 100%;
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
      border-color: transparent;
    }

    /* 优势卡片 */
    .features-grid {
      grid-template-columns: repeat(3, 1fr);
    }
    .feature-icon {
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .card:hover .feature-icon {
      color: var(--accent-orange);
    }

    /* 功能分组 */
    .func-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }
    .func-row.reverse {
      flex-direction: row-reverse;
    }
    .func-text {
      flex: 1;
    }
    .func-image {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .func-image img {
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .func-list {
      list-style: none;
      margin: 16px 0;
    }
    .func-list li {
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-gray);
    }
    .func-list li i {
      color: var(--primary);
    }

    /* 场景卡片 */
    .scenario-grid {
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .scenario-card {
      position: relative;
      border-radius: 16px;
      overflow: hidden;
      height: 280px;
      background-size: cover;
      background-position: center;
    }
    .scenario-card .overlay {
      background: linear-gradient(0deg, rgba(15,26,15,0.9) 0%, rgba(15,26,15,0.3) 100%);
      height: 100%;
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      color: white;
      transition: 0.3s;
    }
    .scenario-card:hover .overlay {
      background: linear-gradient(0deg, rgba(15,26,15,0.98) 0%, rgba(15,26,15,0.5) 100%);
    }

    /* 案例 */
    .case-grid {
      grid-template-columns: repeat(3, 1fr);
    }
    .case-badge {
      color: var(--accent-orange);
      font-size: 14px;
      background: rgba(245,158,11,0.12);
      padding: 4px 12px;
      border-radius: 20px;
    }
    .case-quote {
      font-style: italic;
      margin: 16px 0;
      border-left: 4px solid var(--primary);
      padding-left: 16px;
    }
    .case-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
      margin: 8px 0;
    }

    /* 价格 */
    .pricing-grid {
      grid-template-columns: repeat(4, 1fr);
    }
    .price-card {
      position: relative;
      text-align: center;
    }
    .price-card.popular {
      border: 2px solid var(--accent-orange);
      box-shadow: 0 12px 28px rgba(245,158,11,0.18);
    }
    .badge-popular {
      background: var(--accent-orange);
      color: #0F1A0F;
      font-weight: 700;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 14px;
    }
    .price-number {
      font-size: 36px;
      font-weight: 700;
      margin: 12px 0 8px;
    }
    .price-list {
      text-align: left;
      margin: 20px 0;
    }
    .btn-price {
      width: 100%;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: none;
      font-weight: 600;
      padding: 18px 0;
      display: flex;
      justify-content: space-between;
      font-size: 16px;
      color: var(--text-dark);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: var(--bg-light-gray);
      border-radius: 8px;
      padding: 0 20px;
    }
    .faq-item.active .faq-answer {
      max-height: 160px;
      padding: 20px;
    }

    /* CTA 尾 */
    .cta-footer {
      background: var(--bg-dark);
      text-align: center;
      color: white;
    }
    .btn-cta-large {
      background: var(--accent-orange);
      color: #0F1A0F;
      padding: 16px 48px;
      font-size: 18px;
      border-radius: 50px;
      font-weight: 700;
    }
    .btn-cta-large:hover {
      background: var(--accent-orange-dark);
    }

    .footer {
      background: #1A1A1A;
      color: #B0B0B0;
      padding: 48px 0 24px;
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer a {
      color: #ccc;
    }

    @media (max-width: 1024px) {
      .grid { gap: 20px; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .pricing-grid { grid-template-columns: repeat(2,1fr); }
      .case-grid { grid-template-columns: 1fr; }
      .func-row { flex-direction: column; }
      .func-row.reverse { flex-direction: column; }
      .hero .container { flex-direction: column; }
      .hero-text h1 { font-size: 40px; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .burger { display: flex; }
      .mobile-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: #0F1A0F;
        flex-direction: column;
        padding: 24px;
        display: none;
      }
      .mobile-menu.open { display: flex; }
      .features-grid, .scenario-grid, .pricing-grid { grid-template-columns: 1fr; }
      .section-title { font-size: 28px; }
      .hero-text h1 { font-size: 32px; }
      .footer-grid { grid-template-columns: 1fr; }
    }