/* ==========================================
       全局变量与重置 (高端科技感深色主题)
       ========================================== */
    :root {
      /* 核心品牌色 */
      --color-primary: #dc9700;
      /* 头部尾部主副背景 */
      --bg-header-footer: #3f2814;
      --bg-hf-hover: #482d19;
      /* CTA按钮渐变交互色 */
      --btn-normal: #dd9800;
      --btn-hover: #fed107;
      /* 页面背景与卡片色 */
      --bg-body: #0d0805;
      --bg-card: #18100a;
      --bg-card-hover: #22170f;
      /* 文字色 */
      --text-main: #e8ddd0;
      --text-muted: #a39587;
      --border-color: #352211;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", STHeiti, "Microsoft Yahei", sans-serif;
      background-color: var(--bg-body);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: var(--color-primary);
      transition: all 0.3s ease;
    }

    /* 居中核心容器，严格限制 1200px */
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* ==========================================
       UI细节：按钮与标签
       ========================================== */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      border-radius: 6px; /* 要求的精致圆角 */
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      border: none;
      transition: all 0.3s ease;
      box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    }

    .btn-large {
      padding: 14px 32px;
      font-size: 18px;
    }

    /* 购买/引导动作按钮特效 */
    .btn-primary, .nav-cta, .btn-buy, .btn-green {
      background: linear-gradient(135deg, var(--btn-normal) 0%, #c28500 100%);
      color: #fff !important;
      text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    }

    .btn-primary:hover, .nav-cta:hover, .btn-buy:hover, .btn-green:hover {
      background: linear-gradient(135deg, var(--btn-hover) 0%, var(--btn-normal) 100%);
      color: #111 !important;
      text-shadow: none;
      box-shadow: 0 6px 15px rgba(221, 152, 0, 0.4);
      transform: translateY(-2px);
    }

    .btn-outline {
      border: 1px solid var(--color-primary);
      color: var(--color-primary);
      background: transparent;
    }

    .btn-outline:hover {
      background: var(--color-primary);
      color: #fff;
      box-shadow: 0 6px 15px rgba(220, 151, 0, 0.3);
    }

    .highlight {
      color: var(--color-primary);
    }

    /* ==========================================
       导航栏 (Header)
       ========================================== */
    .nav {
      background-color: var(--bg-header-footer);
      position: sticky;
      top: 0;
      z-index: 999;
      box-shadow: 0 2px 20px rgba(0, 0, 0, 0.6);
      height: 70px;
      display: flex;
      align-items: center;
    }

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

    .nav-logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--color-primary);
      letter-spacing: 1px;
    }
    
    .nav-logo span {
      color: #fff;
      font-weight: 400;
      margin-left: 4px;
    }

    .nav-links {
      list-style: none;
      display: flex;
      gap: 10px;
    }

    .nav-links a {
      color: #e8ddd0;
      padding: 8px 16px;
      border-radius: 6px;
      font-size: 15px;
    }

    .nav-links a:hover, .nav-links a.active {
      background-color: var(--bg-hf-hover);
      color: var(--color-primary);
    }

    .nav-toggle {
      display: none;
      background: transparent;
      border: none;
      color: var(--color-primary);
      font-size: 28px;
      cursor: pointer;
    }

    /* ==========================================
       首屏 Hero
       ========================================== */
    .hero {
      padding: 80px 0;
      text-align: center;
      background: radial-gradient(circle at top, var(--bg-header-footer) 0%, var(--bg-body) 70%);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      background: rgba(220, 151, 0, 0.1);
      border: 1px solid rgba(220, 151, 0, 0.3);
      color: var(--color-primary);
      border-radius: 50px;
      font-size: 14px;
      margin-bottom: 24px;
    }

    .hero h1 {
      font-size: 48px;
      margin-bottom: 24px;
      color: #fff;
      letter-spacing: 2px;
    }

    .hero p {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 40px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
    }

    /* 数据统计条：对称5列 */
    .stats-row {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 20px;
      margin-top: 60px;
      padding-top: 40px;
      border-top: 1px solid var(--border-color);
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 8px;
    }

    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* ==========================================
       通用区块与排版
       ========================================== */
    section {
      padding: 80px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-title {
      text-align: center;
      font-size: 32px;
      color: #fff;
      margin-bottom: 16px;
    }

    .section-subtitle {
      text-align: center;
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 16px;
    }

    /* ==========================================
       推荐套餐卡片：对称4列
       ========================================== */
    .plan-cards {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .plan-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 32px 24px;
      text-align: center;
      position: relative;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .plan-card:hover {
      background: var(--bg-card-hover);
      border-color: var(--color-primary);
      transform: translateY(-8px);
      box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
    }

    .plan-card.hot {
      background: linear-gradient(180deg, rgba(63, 40, 20, 0.4) 0%, var(--bg-card) 100%);
      border-color: rgba(220, 151, 0, 0.5);
    }

    .card-badge {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--color-primary);
      color: #111;
      padding: 4px 16px;
      border-radius: 50px;
      font-size: 12px;
      font-weight: bold;
    }

    .plan-name {
      font-size: 20px;
      font-weight: 600;
      color: #fff;
      margin-bottom: 16px;
    }

    .plan-price {
      font-size: 36px;
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 24px;
    }

    .plan-price span {
      font-size: 16px;
      color: var(--text-muted);
      font-weight: normal;
    }

    .plan-specs {
      list-style: none;
      margin-bottom: 32px;
      flex-grow: 1;
    }

    .plan-specs li {
      padding: 10px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 14px;
      color: var(--text-main);
    }

    .plan-specs li:last-child {
      border-bottom: none;
      color: var(--color-primary);
    }

    .plan-btn {
      width: 100%;
    }

    .last-updated {
      text-align: center;
      margin-top: 32px;
      font-size: 14px;
      color: var(--text-muted);
    }

    /* ==========================================
       表格规范
       ========================================== */
    .compare-table {
      width: 100%;
      border-collapse: collapse;
	  min-width: 800px;
      background: var(--bg-card);
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }

    .compare-table th, .compare-table td {
      padding: 16px;
      text-align: center;
      border-bottom: 1px solid var(--border-color);
      font-size: 15px;
	  white-space: nowrap;
    }

    .compare-table th {
      background: var(--bg-hf-hover);
      color: var(--color-primary);
      font-weight: 600;
    }

    .compare-table tr:hover {
      background: var(--bg-card-hover);
    }

    .compare-table .price {
      color: var(--color-primary);
      font-weight: 600;
    }

    .btn-buy {
      padding: 6px 16px;
      font-size: 14px;
      display: inline-block;
    }

    /* ==========================================
       优势区块：对称3列
       ========================================== */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .advantage-item {
      display: flex;
      gap: 20px;
      background: var(--bg-card);
      padding: 32px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      transition: all 0.3s ease;
    }

    .advantage-item:hover {
      border-color: rgba(220, 151, 0, 0.4);
      background: var(--bg-card-hover);
    }

    .advantage-icon {
      font-size: 32px;
      line-height: 1;
    }

    .advantage-item h3 {
      font-size: 18px;
      color: #fff;
      margin-bottom: 12px;
    }

    .advantage-item p {
      font-size: 14px;
      color: var(--text-muted);
      text-align: justify;
    }

    /* ==========================================
       使用场景/教程区块：对称3列
       ========================================== */
    .usecase-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .usecase-card {
      display: block;
      background: var(--bg-card);
      padding: 32px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      position: relative;
    }

    .usecase-card:hover {
      border-color: var(--color-primary);
      transform: translateY(-4px);
    }

    .usecase-icon {
      font-size: 36px;
      margin-bottom: 16px;
    }

    .usecase-card h3 {
      font-size: 20px;
      color: #fff;
      margin-bottom: 12px;
    }

    .usecase-card p {
      color: var(--text-muted);
      font-size: 14px;
      margin-bottom: 24px;
    }

    .usecase-pick {
      font-size: 12px;
      color: var(--color-primary);
      font-weight: bold;
    }

    .pick-badge {
      background: #dc3545;
      color: #fff;
      padding: 2px 6px;
      border-radius: 4px;
      margin-left: 8px;
    }

    /* ==========================================
       FAQ区块：居中列表
       ========================================== */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px 32px;
      margin-bottom: 20px;
      transition: all 0.3s;
    }

    .faq-item:hover {
      border-color: rgba(220, 151, 0, 0.3);
    }

    .faq-q {
      font-size: 18px;
      font-weight: 600;
      color: #fff;
      margin-bottom: 12px;
    }

    .faq-a {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.8;
      text-align: justify;
    }

    /* ==========================================
       页脚 (Footer)
       ========================================== */
    .footer {
      background: var(--bg-header-footer);
      padding: 60px 0 24px;
      border-top: 1px solid #5a3a1e;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: var(--color-primary);
      font-size: 18px;
      margin-bottom: 24px;
    }

    .footer-col p {
      color: var(--text-muted);
      font-size: 14px;
      max-width: 400px;
      line-height: 1.8;
    }

    .footer-col ul {
      list-style: none;
    }

    .footer-col ul li {
      margin-bottom: 12px;
    }

    .footer-col ul a {
      color: var(--text-muted);
      font-size: 14px;
    }

    .footer-col ul a:hover {
      color: var(--color-primary);
      padding-left: 4px;
    }

    .footer-bottom {
      text-align: center;
      padding-top: 24px;
      border-top: 1px solid rgba(255,255,255,0.05);
      color: rgba(255,255,255,0.3);
      font-size: 14px;
    }

    /* ==========================================
       响应式适配 (Mobile & Tablet)
       ========================================== */
    @media (max-width: 1024px) {
      .plan-cards { grid-template-columns: repeat(2, 1fr); }
      .advantages-grid { grid-template-columns: repeat(2, 1fr); }
      .usecase-cards { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
	.toc ol,
	.overview-grid,
	.tips-grid,
	.article-grid, 
	.faq-grid, 
	.appendix-grid, 
	.series-grid, 
    .mistakes-grid, 
    .step-list,
	.pros-cons { grid-template-columns: 1fr; }
      .hero h1 { font-size: 32px; }
      .stats-row { grid-template-columns: repeat(2, 1fr); gap: 30px 15px; }
      .plan-cards { grid-template-columns: 1fr; }
      .advantages-grid { grid-template-columns: 1fr; }
      .usecase-cards { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); text-align: center; gap: 30px 20px; }
      .footer-col:nth-child(1) { grid-column: span 2; text-align: center; }
      .footer-col p { max-width: 100%; margin: 0 auto; }
      .hero-buttons { flex-direction: column; padding: 0 20px; }
      
      .nav-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--bg-header-footer);
        flex-direction: column;
        padding: 20px;
        text-align: center;
        box-shadow: 0 10px 20px rgba(0,0,0,0.5);
      }
      .nav-links.active { display: flex; }
      .nav-cta { display: none; }
    }

    /* ==========================================
       交互动画类
       ========================================== */
    .animate {
      opacity: 0;
      transform: translateY(30px);
      transition: all 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
    }
    .animate.visible {
      opacity: 1;
      transform: translateY(0);
    }