/* roulang page: index */
:root {
      --primary-deep-green: #1B5E20;
      --primary-dark-green: #0D3B0F;
      --accent-amber: #FF8F00;
      --accent-amber-hover: #E65100;
      --bg-warm-white: #F9F7F1;
      --card-white: #FFFFFF;
      --text-heading: #1B1B1B;
      --text-body: #4A4A4A;
      --text-muted: #6D6D6D;
      --text-on-dark: #FFFFFF;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0 8px 30px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 16px 40px rgba(0,0,0,0.12);
      --radius-card: 20px;
      --radius-image: 16px;
      --radius-button: 30px;
      --radius-badge: 12px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --transition-smooth: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm-white);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-top: 72px;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-sans);
      color: var(--text-heading);
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      margin-bottom: 1rem;
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 0.75rem;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      line-height: 1.4;
      margin-bottom: 0.5rem;
    }

    p {
      margin-bottom: 1rem;
      max-width: 680px;
    }

    a {
      color: var(--primary-deep-green);
      text-decoration: none;
      transition: var(--transition-smooth);
    }

    a:hover {
      color: var(--accent-amber);
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航系统 */
    .brand-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--card-white);
      box-shadow: 0 2px 20px rgba(0,0,0,0.04);
      z-index: 100;
      display: flex;
      align-items: center;
      padding: 0 2rem;
    }

    .nav-logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary-deep-green);
      letter-spacing: 1px;
      margin-right: auto;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .nav-logo i {
      font-size: 2rem;
      color: var(--accent-amber);
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      list-style: none;
      margin: 0 1.5rem;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      padding: 0.5rem 0;
      position: relative;
      transition: var(--transition-smooth);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-deep-green);
      transition: width 0.2s ease;
    }

    .nav-links a:hover {
      color: var(--primary-deep-green);
    }

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

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1rem;
    }

    .btn-nav {
      background: var(--accent-amber);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: 24px;
      font-weight: 700;
      font-size: 14px;
      cursor: pointer;
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
    }

    .btn-nav:hover {
      background: var(--accent-amber-hover);
      color: white;
      box-shadow: 0 4px 15px rgba(255,143,0,0.3);
    }

    .countdown-badge {
      background: rgba(255,143,0,0.12);
      color: var(--accent-amber);
      padding: 6px 14px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .countdown-dot {
      width: 8px;
      height: 8px;
      background: var(--accent-amber);
      border-radius: 50%;
      animation: pulse 1.5s infinite;
    }

    @keyframes pulse {
      0% { opacity: 0.6; transform: scale(0.9); }
      50% { opacity: 1; transform: scale(1.2); }
      100% { opacity: 0.6; transform: scale(0.9); }
    }

    .mobile-toggle {
      display: none;
      font-size: 1.8rem;
      color: var(--primary-deep-green);
      cursor: pointer;
    }

    /* Hero */
    .hero-section {
      padding: 4rem 0 3rem;
      background: var(--bg-warm-white);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }

    .hero-left {
      flex: 1 1 55%;
    }

    .hero-right {
      flex: 1 1 45%;
      position: relative;
    }

    .hero-img-wrapper {
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .hero-img-wrapper img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    .hero-overlay {
      position: absolute;
      bottom: 0;
      right: 0;
      width: 100%;
      height: 50%;
      background: linear-gradient(to top left, rgba(27,94,32,0.3), transparent);
      pointer-events: none;
    }

    .floating-badge {
      position: absolute;
      top: 20px;
      right: 20px;
      background: rgba(255,143,0,0.9);
      color: white;
      padding: 10px 20px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 16px;
      box-shadow: 0 8px 20px rgba(255,143,0,0.3);
      animation: float 3s ease-in-out infinite;
    }

    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-6px); }
      100% { transform: translateY(0); }
    }

    .btn-primary {
      background: var(--accent-amber);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
      transition: var(--transition-smooth);
      display: inline-block;
      text-decoration: none;
    }

    .btn-primary:hover {
      background: var(--accent-amber-hover);
      color: white;
      box-shadow: 0 8px 25px rgba(255,143,0,0.4);
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary-deep-green);
      color: var(--primary-deep-green);
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
      transition: var(--transition-smooth);
      display: inline-block;
      text-decoration: none;
    }

    .btn-secondary:hover {
      background: #E8F5E9;
      color: var(--primary-deep-green);
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 1.5rem;
    }

    /* 板块通用 */
    .section {
      padding: 5rem 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }

    .section-title h2 {
      color: var(--text-heading);
    }

    .section-title p {
      color: var(--text-muted);
      margin: 0 auto;
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      display: flex;
      flex-direction: column;
      height: fit-content;
    }

    .feature-card.tall {
      padding: 48px 32px;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }

    .feature-icon {
      font-size: 2.5rem;
      color: var(--accent-amber);
      margin-bottom: 1.2rem;
    }

    .badge {
      background: rgba(255,143,0,0.12);
      color: var(--accent-amber);
      padding: 6px 14px;
      border-radius: var(--radius-badge);
      font-weight: 700;
      font-size: 14px;
      display: inline-block;
      margin: 0.8rem 0;
      width: fit-content;
    }

    /* 案例瀑布流 */
    .showcase-masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      break-inside: avoid;
    }

    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-card-hover);
    }

    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      border-radius: var(--radius-image) var(--radius-image) 0 0;
    }

    .case-content {
      padding: 20px;
    }

    .case-tag {
      background: transparent;
      border: 1px solid var(--accent-amber);
      color: var(--accent-amber);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 0.8rem;
    }

    /* 对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }

    .compare-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }

    .compare-card.highlight {
      background: linear-gradient(145deg, #1B5E20, #0D3B0F);
      color: white;
    }

    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }

    .compare-card.highlight .compare-row {
      border-bottom: 1px solid rgba(255,255,255,0.15);
      color: white;
    }

    .check-icon {
      color: var(--accent-amber);
    }

    /* FAQ */
    .accordion-faq .accordion-item {
      background: var(--bg-warm-white);
      border-radius: 16px;
      margin-bottom: 16px;
      border: none;
    }

    .accordion-faq .accordion-title {
      font-size: 18px;
      font-weight: 600;
      background: #F9F7F1;
      padding: 20px;
      border-radius: 16px;
      border-left: 4px solid var(--accent-amber);
      color: var(--text-heading);
    }

    .accordion-faq .accordion-content {
      background: white;
      padding: 20px;
      border-radius: 0 0 16px 16px;
    }

    /* CTA横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #1B5E20, #0D3B0F);
      padding: 5rem 0;
      text-align: center;
      color: white;
    }

    .cta-buttons {
      display: flex;
      justify-content: center;
      gap: 20px;
      margin-top: 2rem;
    }

    .btn-outline-light {
      border: 2px solid white;
      color: white;
      background: transparent;
      padding: 14px 32px;
      border-radius: 30px;
      font-weight: 700;
      transition: var(--transition-smooth);
    }

    .btn-outline-light:hover {
      background: rgba(255,255,255,0.2);
      color: white;
    }

    /* 页脚 */
    .footer {
      background: #0D3B0F;
      color: #BDBDBD;
      padding: 3rem 0 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.2fr 1fr;
      gap: 2rem;
    }

    .footer-logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: white;
    }

    .social-icons i {
      font-size: 1.5rem;
      margin-right: 15px;
      color: #BDBDBD;
      transition: var(--transition-smooth);
    }

    .social-icons i:hover {
      color: var(--accent-amber);
    }

    .copyright {
      text-align: center;
      padding: 20px;
      font-size: 13px;
      color: #6D6D6D;
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 2rem;
    }

    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .showcase-masonry { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      .nav-links, .nav-actions .countdown-badge { display: none; }
      .mobile-toggle { display: block; }
      .hero-grid { flex-direction: column; }
      .features-grid, .showcase-masonry, .compare-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .cta-buttons { flex-direction: column; align-items: center; }
    }