/* roulang page: index */
/* ===== 设计变量与全局重置 ===== */
    :root {
      --primary-deep: #0B3B3C;
      --accent-gold: #C8975E;
      --accent-gold-hover: #B07D4A;
      --bg-light: #FAFAF8;
      --bg-soft-green: #F0F4F3;
      --card-bg: #FFFFFF;
      --text-heading: #1A2A2B;
      --text-body: #4A5556;
      --text-muted: #8B9394;
      --text-reverse: #FFFFFF;
      --border-light: rgba(11,59,60,0.08);
      --shadow-card: 0 4px 20px rgba(11,59,60,0.06);
      --shadow-card-hover: 0 12px 32px rgba(11,59,60,0.12);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-icon: 12px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, -apple-system, sans-serif;
      --transition-base: all 0.25s ease;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3 {
      color: var(--text-heading);
      font-weight: 700;
    }
    
    h1 {
      font-size: clamp(2.2rem, 5vw, 3.5rem);
      line-height: 1.2;
      letter-spacing: -0.5px;
    }
    
    h2 {
      font-size: clamp(1.8rem, 4vw, 2.25rem);
      line-height: 1.3;
      margin-bottom: 0.5rem;
    }
    
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
      line-height: 1.4;
    }
    
    a {
      color: var(--accent-gold);
      transition: var(--transition-base);
      text-decoration: none;
    }
    
    a:hover {
      color: var(--accent-gold-hover);
      text-decoration: underline;
      text-underline-offset: 4px;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .row {
      max-width: 1200px;
      margin: 0 auto;
    }
    
    .section-padding {
      padding: 80px 0;
    }
    
    @media (max-width: 640px) {
      .section-padding {
        padding: 60px 0;
      }
      h1 {
        font-size: 2rem;
      }
      h2 {
        font-size: 1.75rem;
      }
    }
    
    /* ===== 导航 ===== */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
    }
    
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
    }
    
    .logo span {
      color: var(--accent-gold);
    }
    
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    
    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 0.95rem;
      text-decoration: none;
    }
    
    .nav-links a:hover {
      color: var(--accent-gold);
      text-decoration: none;
    }
    
    .nav-cta {
      background: var(--accent-gold);
      color: white !important;
      padding: 8px 20px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-base);
    }
    
    .nav-cta:hover {
      background: var(--accent-gold-hover);
      box-shadow: 0 4px 12px rgba(200,151,94,0.3);
    }
    
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
      cursor: pointer;
    }
    
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 2rem 1.5rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--border-light);
        box-shadow: 0 12px 24px rgba(0,0,0,0.05);
        align-items: flex-start;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .nav-cta {
        width: 100%;
        text-align: center;
        padding: 12px;
      }
    }
    
    /* ===== Hero 分屏 ===== */
    #hero {
      background: linear-gradient(135deg, #FAFAF8 0%, #F0F4F3 100%);
      padding-top: 120px;
      padding-bottom: 80px;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    
    .hero-left {
      flex: 1 1 50%;
    }
    
    .hero-right {
      flex: 1 1 50%;
      position: relative;
    }
    
    .badge-tag {
      display: inline-block;
      background: rgba(200,151,94,0.1);
      color: var(--accent-gold);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 1.2rem;
    }
    
    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin: 1.2rem 0 2rem;
      max-width: 480px;
    }
    
    .hero-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    
    .btn-primary {
      background: var(--accent-gold);
      color: white;
      padding: 14px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      border: none;
      display: inline-block;
      transition: var(--transition-base);
      box-shadow: 0 4px 10px rgba(200,151,94,0.2);
      text-decoration: none;
      cursor: pointer;
    }
    
    .btn-primary:hover {
      background: var(--accent-gold-hover);
      box-shadow: 0 8px 20px rgba(176,125,74,0.3);
      color: white;
      text-decoration: none;
    }
    
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 14px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: var(--transition-base);
      text-decoration: none;
    }
    
    .btn-outline:hover {
      background: #F0F4F3;
      border-color: var(--accent-gold);
      color: var(--primary-deep);
      text-decoration: none;
    }
    
    .hero-image-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    
    .data-badge {
      position: absolute;
      background: white;
      border-radius: 12px;
      padding: 12px 18px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.08);
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 600;
      color: var(--text-heading);
    }
    
    .badge-number {
      font-family: var(--font-number);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1;
    }
    
    .badge-top {
      top: -15px;
      right: 20px;
    }
    
    .badge-bottom {
      bottom: -15px;
      left: 20px;
    }
    
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-right {
        margin-top: 2rem;
      }
      .data-badge {
        position: static;
        margin: 1rem 0;
      }
    }
    
    /* ===== 圆角大卡通用 ===== */
    .feature-card, .case-card, .pricing-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    
    .feature-card:hover, .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
      border-top: 2px solid var(--accent-gold);
    }
    
    .icon-box {
      width: 64px;
      height: 64px;
      background: #F0F4F3;
      border-radius: var(--radius-icon);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      color: var(--primary-deep);
      margin-bottom: 1.5rem;
    }
    
    .card-badge {
      font-family: var(--font-number);
      font-weight: 700;
      color: var(--accent-gold);
      font-size: 1.1rem;
      margin-top: auto;
      padding-top: 1rem;
    }
    
    /* ===== 场景图文交错 ===== */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 3rem;
    }
    
    .scene-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    
    .scene-text {
      flex: 1;
    }
    
    @media (max-width: 768px) {
      .scene-row {
        flex-direction: column;
      }
    }
    
    /* ===== 价格卡 ===== */
    .pricing-highlight {
      border-top: 3px solid var(--accent-gold);
      transform: scale(1.02);
    }
    
    .price-number {
      font-family: var(--font-number);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent-gold);
    }
    
    /* ===== FAQ 手风琴 ===== */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
      cursor: pointer;
    }
    
    .accordion-title {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-body);
    }
    
    .accordion-item.active .accordion-content {
      max-height: 200px;
      margin-top: 0.8rem;
    }
    
    /* ===== 联系表单 ===== */
    .contact-form input, .contact-form textarea {
      border-radius: 8px;
      border: 1px solid #ddd;
      padding: 12px;
      width: 100%;
      margin-bottom: 1rem;
      transition: 0.2s;
    }
    
    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--accent-gold);
      box-shadow: 0 0 0 3px rgba(200,151,94,0.15);
      outline: none;
    }
    
    /* ===== 页脚 ===== */
    .site-footer {
      background: var(--primary-deep);
      color: white;
      padding: 3rem 0 0;
    }
    
    .footer-bottom {
      background: #072829;
      padding: 1.2rem 0;
      margin-top: 2rem;
      color: #aaa;
    }
    
    .footer-links a {
      color: #ccc;
      font-size: 0.9rem;
    }
    
    .footer-links a:hover {
      color: var(--accent-gold);
    }