/* roulang page: index */
/* ----- 设计变量与基础重置 ----- */
    :root {
      --primary-dark: #3E2723;      /* 深檀木棕 */
      --accent-gold: #C5A059;       /* 香槟金 */
      --deep-green: #1B4D3E;        /* 暗翡翠绿 */
      --bg-warm: #F9F7F4;           /* 暖灰白背景 */
      --bg-dark: #1C1C1C;           /* 深炭灰 */
      --white: #FFFFFF;
      --text-dark: #2E2A28;
      --text-muted: #6B625E;
      --border-light: #E5E0D9;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-serif: 'Noto Serif SC', serif;
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --max-width: 1280px;
      --section-gap: 100px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease, background 0.25s ease;
    }
    
    button, input, select, textarea {
      font-family: inherit;
      outline: none;
      border: none;
      background: transparent;
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    
    /* 标题层级 */
    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 600;
      line-height: 1.3;
    }
    
    h1 { font-size: 3.2rem; font-weight: 700; }
    h2 { font-size: 2.4rem; }
    h3 { font-size: 1.8rem; font-weight: 500; }
    
    @media (max-width: 768px) {
      h1 { font-size: 2.6rem; }
      h2 { font-size: 2rem; }
      h3 { font-size: 1.5rem; }
      :root { --section-gap: 70px; }
    }
    
    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: all 0.3s ease;
      cursor: pointer;
      border: 1px solid transparent;
      background: transparent;
      text-align: center;
    }
    
    .btn-primary {
      background: linear-gradient(135deg, #C5A059 0%, #A8863F 100%);
      color: var(--white);
      border: none;
      box-shadow: 0 4px 10px rgba(197,160,89,0.25);
    }
    
    .btn-primary:hover {
      background: linear-gradient(135deg, #D4B36A 0%, #B8964A 100%);
      transform: translateY(-2px);
      box-shadow: 0 12px 22px rgba(197,160,89,0.35);
    }
    
    .btn-outline {
      border: 1px solid var(--accent-gold);
      color: var(--accent-gold);
      background: transparent;
    }
    
    .btn-outline:hover {
      background: rgba(197,160,89,0.08);
      transform: translateY(-2px);
    }
    
    /* 卡片通用 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: box-shadow 0.3s ease, transform 0.3s ease, border 0.2s;
      border: 1px solid transparent;
    }
    
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
      border-color: var(--accent-gold);
    }
    
    /* ===== 导航 Mega Menu ===== */
    header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(249,247,244,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      transition: background 0.3s;
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.7rem;
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 1px;
    }
    
    .logo i {
      color: var(--accent-gold);
      font-size: 1.9rem;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.2rem;
      list-style: none;
    }
    
    .nav-links a {
      font-weight: 500;
      color: var(--primary-dark);
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.3s ease;
    }
    
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-gold);
    }
    
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    
    /* Mega 面板触发器 */
    .mega-trigger {
      position: relative;
    }
    
    .mega-panel {
      position: absolute;
      top: 100%;
      right: 0;
      margin-top: 12px;
      background: var(--white);
      border-radius: 20px;
      box-shadow: 0 25px 45px rgba(0,0,0,0.12);
      padding: 28px 32px;
      display: flex;
      gap: 40px;
      opacity: 0;
      visibility: hidden;
      transform: translateY(10px);
      transition: all 0.3s ease;
      white-space: nowrap;
      border: 1px solid var(--border-light);
      backdrop-filter: blur(10px);
      z-index: 99;
      min-width: 560px;
    }
    
    .mega-trigger:hover .mega-panel {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }
    
    .mega-col {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    
    .mega-col h4 {
      font-family: var(--font-sans);
      font-weight: 600;
      color: var(--primary-dark);
      margin-bottom: 8px;
      font-size: 1rem;
      border-bottom: 1px solid var(--border-light);
      padding-bottom: 6px;
    }
    
    .mega-col a {
      color: var(--text-muted);
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    
    .mega-col a:hover {
      color: var(--accent-gold);
    }
    
    /* 汉堡菜单 (纯CSS) */
    #menu-toggle {
      display: none;
    }
    
    .burger-icon {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    
    .burger-icon span {
      width: 26px;
      height: 2px;
      background: var(--primary-dark);
      border-radius: 2px;
      transition: 0.3s;
    }
    
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 76px;
        left: 0;
        width: 100%;
        background: rgba(249,247,244,0.98);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        backdrop-filter: blur(15px);
        transform: translateY(-120%);
        transition: 0.4s ease;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      
      #menu-toggle:checked ~ .nav-links {
        transform: translateY(0);
      }
      
      .burger-icon {
        display: flex;
      }
      
      .mega-panel {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        flex-direction: column;
        padding: 1rem 0;
        min-width: auto;
        background: transparent;
        border: none;
        margin-top: 0;
      }
      
      .mega-trigger:hover .mega-panel {
        display: block;
      }
    }
    
    /* ===== Hero ===== */
    .hero {
      background: linear-gradient(0deg, rgba(62,39,35,0.65) 0%, rgba(30,18,13,0.7) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
      margin-top: 76px;
      position: relative;
    }
    
    .hero-content {
      max-width: 700px;
      margin-top: 2rem;
    }
    
    .hero h1 {
      text-shadow: 0 4px 18px rgba(0,0,0,0.6);
      margin-bottom: 1.5rem;
    }
    
    .hero p {
      font-size: 1.2rem;
      margin-bottom: 2rem;
      opacity: 0.9;
    }
    
    .hero-actions {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }
    
    .dynamic-stats {
      display: flex;
      gap: 2rem;
      margin-top: 3rem;
      flex-wrap: wrap;
    }
    
    .stat-item {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(6px);
      border-radius: 16px;
      padding: 1rem 1.8rem;
      border: 1px solid rgba(197,160,89,0.4);
      color: white;
    }
    
    .stat-number {
      font-size: 2rem;
      font-weight: 700;
      font-family: var(--font-serif);
    }
    
    /* ===== 通用板块 ===== */
    section {
      padding: var(--section-gap) 0;
    }
    
    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }
    
    .section-title h2 {
      color: var(--primary-dark);
      margin-bottom: 0.5rem;
    }
    
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    
    .dash-card {
      background: linear-gradient(145deg, #1B4D3E 0%, #2A6B5A 100%);
      color: white;
      padding: 2rem 1.5rem;
      border-radius: 20px;
      text-align: center;
    }
    
    .dash-card i {
      font-size: 2.2rem;
      color: var(--accent-gold);
      margin-bottom: 1rem;
    }
    
    /* 核心优势非对称 */
    .advantage-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
      align-items: center;
    }
    
    .adv-left img {
      border-radius: 24px;
      height: 380px;
      object-fit: cover;
      width: 100%;
    }
    
    .adv-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.5rem;
    }
    
    /* 服务矩阵 Tab */
    .tab-buttons {
      display: flex;
      gap: 1rem;
      margin-bottom: 2rem;
      flex-wrap: wrap;
      justify-content: center;
    }
    
    .tab-btn {
      padding: 0.7rem 2rem;
      border-radius: 30px;
      background: var(--white);
      border: 1px solid var(--border-light);
      font-weight: 600;
      cursor: pointer;
      transition: 0.2s;
    }
    
    .tab-btn.active {
      background: var(--accent-gold);
      color: white;
      border-color: var(--accent-gold);
    }
    
    .service-cards {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
    }
    
    .service-card img {
      height: 200px;
      object-fit: cover;
      border-radius: 12px 12px 0 0;
    }
    
    /* 对比表 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }
    
    .compare-col {
      padding: 2rem;
      border-radius: 20px;
    }
    
    .traditional {
      background: #f0ede8;
      color: #5e5a55;
    }
    
    .ag-premium {
      background: var(--deep-green);
      color: white;
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
    }
    
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      cursor: pointer;
    }
    
    /* CTA */
    .cta-section {
      background: var(--bg-dark);
      color: white;
    }
    
    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
    }
    
    .input-group input, .input-group select {
      width: 100%;
      padding: 0.9rem;
      background: transparent;
      border: 1px solid rgba(255,255,255,0.3);
      border-radius: 8px;
      color: white;
    }
    
    /* 页脚 */
    footer {
      background: var(--bg-dark);
      color: #ccc;
      padding: 3rem 0 1.5rem;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    
    @media (max-width: 768px) {
      .dashboard-grid, .advantage-row, .compare-wrapper, .cta-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
    }