/* ========================================
   kpeai.cloud — 智能数字人文研究平台
   Custom Theme CSS
   ======================================== */

:root {
  --kpe-primary: #2563eb;
  --kpe-primary-dark: #1d4ed8;
  --kpe-primary-light: #dbeafe;
  --kpe-accent: #7c3aed;
  --kpe-accent-light: #ede9fe;
  --kpe-success: #059669;
  --kpe-danger: #dc2626;
  --kpe-warning: #d97706;
  --kpe-bg: #f8fafc;
  --kpe-card-bg: #ffffff;
  --kpe-text: #1e293b;
  --kpe-text-muted: #64748b;
  --kpe-border: #e2e8f0;
  --kpe-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --kpe-shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --kpe-shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
  --kpe-radius: 12px;
  --kpe-radius-sm: 8px;
  --kpe-transition: all 0.2s ease;
}

/* Global */
body {
  background: var(--kpe-bg);
  color: var(--kpe-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ===== Header & Navbar ===== */
.kpe-navbar {
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  border-bottom: none;
  padding: 0;
  box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}
.kpe-navbar .container {
  padding-top: 0;
  padding-bottom: 0;
}
.kpe-navbar .navbar-brand {
  color: #fff !important;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  padding: 0.6rem 0;
  transition: var(--kpe-transition);
}
.kpe-navbar .navbar-brand:hover {
  opacity: 0.9;
}
.kpe-navbar .navbar-brand .brand-logo {
  height: 50px;
  width: auto;
  max-width: 160px;
  border-radius: 6px;
  background: #fff;
  padding: 3px 8px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
  object-fit: contain;
}
.kpe-navbar .navbar-brand .brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--kpe-primary);
  border-radius: 10px;
  margin-right: 10px;
  font-size: 1.1rem;
}
.kpe-navbar .navbar-toggler {
  border-color: rgba(255,255,255,0.2);
  padding: 0.35rem 0.65rem;
}
.kpe-navbar .navbar-toggler-icon {
  filter: invert(1);
}
.kpe-navbar .nav-link {
  color: rgba(255,255,255,0.75) !important;
  font-weight: 500;
  font-size: 0.925rem;
  padding: 1.1rem 1rem !important;
  position: relative;
  transition: var(--kpe-transition);
}
.kpe-navbar .nav-link:hover,
.kpe-navbar .nav-link.active {
  color: #fff !important;
}
.kpe-navbar .nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 3px;
  background: var(--kpe-primary);
  border-radius: 3px 3px 0 0;
  transition: width 0.3s ease;
}
.kpe-navbar .nav-link:hover::after,
.kpe-navbar .nav-link.active::after {
  width: 60%;
}

/* ===== Hero Section ===== */
.kpe-hero {
  background: linear-gradient(135deg, #1e40af 0%, #7c3aed 50%, #2563eb 100%);
  color: #fff;
  padding: 3rem 0 2.5rem;
  margin: -1.5rem -12px 2rem;
  position: relative;
  overflow: hidden;
}
.kpe-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: rgba(255,255,255,0.05);
  border-radius: 50%;
}
.kpe-hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 300px;
  height: 300px;
  background: rgba(255,255,255,0.03);
  border-radius: 50%;
}
.kpe-hero h1 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  position: relative;
  z-index: 1;
}
.kpe-hero p {
  opacity: 0.9;
  font-size: 1.05rem;
  position: relative;
  z-index: 1;
}

/* ===== Cards ===== */
.kpe-card {
  background: var(--kpe-card-bg);
  border: 1px solid var(--kpe-border);
  border-radius: var(--kpe-radius);
  box-shadow: var(--kpe-shadow);
  transition: var(--kpe-transition);
  overflow: hidden;
}
.kpe-card:hover {
  box-shadow: var(--kpe-shadow-md);
  transform: translateY(-2px);
}
.kpe-card .card-header {
  background: transparent;
  border-bottom: 1px solid var(--kpe-border);
  padding: 1rem 1.25rem;
  font-weight: 600;
}
.kpe-card .card-body {
  padding: 1.25rem;
}

/* Featured card */
.kpe-card-featured {
  border: none;
  background: linear-gradient(135deg, var(--kpe-primary) 0%, var(--kpe-accent) 100%);
  color: #fff;
}
.kpe-card-featured .card-header {
  border-bottom-color: rgba(255,255,255,0.15);
  color: #fff;
}
.kpe-card-featured a {
  color: rgba(255,255,255,0.9) !important;
}
.kpe-card-featured a:hover {
  color: #fff !important;
}

/* ===== Section Headers ===== */
.kpe-section-header {
  display: flex;
  align-items: center;
  margin-bottom: 1.5rem;
  gap: 0.75rem;
}
.kpe-section-header .section-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #fff;
  flex-shrink: 0;
}
.kpe-section-header h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0;
}
.kpe-section-header .section-desc {
  font-size: 0.85rem;
  color: var(--kpe-text-muted);
  margin: 0;
}

/* ===== Link Items ===== */
.kpe-link-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border-radius: var(--kpe-radius-sm);
  transition: var(--kpe-transition);
  text-decoration: none;
  color: var(--kpe-text);
  border: 1px solid transparent;
}
.kpe-link-item:hover {
  background: var(--kpe-primary-light);
  border-color: var(--kpe-primary);
  color: var(--kpe-text);
}
.kpe-link-item .link-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.9rem;
}
.kpe-link-item .link-title {
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.4;
}
.kpe-link-item .link-desc {
  font-size: 0.825rem;
  color: var(--kpe-text-muted);
  line-height: 1.4;
}

/* ===== Badges ===== */
.kpe-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.3em 0.75em;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.kpe-badge-primary {
  background: var(--kpe-primary-light);
  color: var(--kpe-primary);
}
.kpe-badge-accent {
  background: var(--kpe-accent-light);
  color: var(--kpe-accent);
}
.kpe-badge-success {
  background: #d1fae5;
  color: var(--kpe-success);
}
.kpe-badge-warning {
  background: #fef3c7;
  color: var(--kpe-warning);
}
.kpe-badge-danger {
  background: #fce7e7;
  color: var(--kpe-danger);
}

/* ===== Buttons ===== */
.kpe-btn {
  border-radius: var(--kpe-radius-sm);
  font-weight: 600;
  padding: 0.5rem 1.25rem;
  font-size: 0.9rem;
  transition: var(--kpe-transition);
  border: none;
}
.kpe-btn-primary {
  background: var(--kpe-primary);
  color: #fff;
}
.kpe-btn-primary:hover {
  background: var(--kpe-primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}
.kpe-btn-outline {
  background: transparent;
  border: 1.5px solid var(--kpe-border);
  color: var(--kpe-text);
}
.kpe-btn-outline:hover {
  border-color: var(--kpe-primary);
  color: var(--kpe-primary);
  background: var(--kpe-primary-light);
}

/* ===== Course Card ===== */
.kpe-course-card {
  border: 1px solid var(--kpe-border);
  border-radius: var(--kpe-radius);
  padding: 1.5rem;
  background: var(--kpe-card-bg);
  transition: var(--kpe-transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}
.kpe-course-card:hover {
  border-color: var(--kpe-primary);
  box-shadow: var(--kpe-shadow-md);
  transform: translateY(-3px);
}
.kpe-course-card.is-published {
  border-left: 4px solid var(--kpe-primary);
}
.kpe-course-card.is-draft {
  border-left: 4px solid var(--kpe-border);
  opacity: 0.75;
}
.kpe-course-card .course-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  font-weight: 800;
  font-size: 1.1rem;
  margin-bottom: 1rem;
}
.kpe-course-card.is-published .course-number {
  background: var(--kpe-primary-light);
  color: var(--kpe-primary);
}
.kpe-course-card.is-draft .course-number {
  background: #f1f5f9;
  color: var(--kpe-text-muted);
}

/* ===== Research Card ===== */
.kpe-research-card {
  border: 1px solid var(--kpe-border);
  border-radius: var(--kpe-radius);
  padding: 1.5rem;
  background: var(--kpe-card-bg);
  transition: var(--kpe-transition);
  height: 100%;
}
.kpe-research-card:hover {
  box-shadow: var(--kpe-shadow-md);
  transform: translateY(-3px);
}

/* ===== Stat Cards ===== */
.kpe-stat {
  text-align: center;
  padding: 1.5rem 1rem;
  border-radius: var(--kpe-radius);
  background: var(--kpe-card-bg);
  border: 1px solid var(--kpe-border);
}
.kpe-stat .stat-number {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 0.25rem;
}
.kpe-stat .stat-label {
  font-size: 0.825rem;
  color: var(--kpe-text-muted);
  font-weight: 500;
}

/* ===== Footer ===== */
.kpe-footer {
  background: #0f172a;
  color: rgba(255,255,255,0.6);
  padding: 2.5rem 0;
  margin-top: 3rem;
  font-size: 0.9rem;
}
.kpe-footer a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
}
.kpe-footer a:hover {
  color: #fff;
}
.kpe-footer .footer-brand {
  color: #fff;
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

/* ===== Slides Container (Course Detail) ===== */
.kpe-slides-container {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  background: #000;
  border-radius: var(--kpe-radius);
  overflow: hidden;
  box-shadow: var(--kpe-shadow-lg);
}
.kpe-slides-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* ===== Admin Layout ===== */
.kpe-admin-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}
.kpe-admin-nav a {
  font-size: 0.85rem;
}

/* ===== Markdown Body ===== */
.markdown-body img, .content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}
.markdown-body h1, .markdown-body h2, .markdown-body h3 {
  margin-top: 1.25rem;
  margin-bottom: .75rem;
  font-weight: 700;
}
.markdown-body p { margin: .5rem 0; line-height: 1.8; }
.markdown-body pre {
  background: #f1f5f9;
  padding: 1rem;
  border-radius: var(--kpe-radius-sm);
  overflow: auto;
  border: 1px solid var(--kpe-border);
}
.markdown-body code {
  background: #f1f5f9;
  padding: .15rem .35rem;
  border-radius: 4px;
  font-size: 0.875em;
}
.markdown-body blockquote {
  border-left: 4px solid var(--kpe-primary);
  padding-left: 1rem;
  color: var(--kpe-text-muted);
  background: #f8fafc;
  padding: 0.75rem 1rem;
  border-radius: 0 var(--kpe-radius-sm) var(--kpe-radius-sm) 0;
}
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: .75rem 0;
}
.markdown-body th, .markdown-body td {
  border: 1px solid var(--kpe-border);
  padding: .5rem;
}

/* ===== Utilities ===== */
.text-gradient {
  background: linear-gradient(135deg, var(--kpe-primary), var(--kpe-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== DeepRead 深读阅读体验 ===== */
.dr-article {
  max-width: 780px;
  margin: 0 auto;
  font-family: "Noto Serif SC", "Source Han Serif CN", "Georgia", "Times New Roman", serif;
  font-size: 1.08rem;
  line-height: 2;
  color: #1a1a1a;
}
.dr-article h1 {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 1rem;
  color: #0f172a;
}
.dr-article .dr-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--kpe-border);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
  font-size: 0.9rem;
  color: var(--kpe-text-muted);
}
.dr-article .dr-meta .dr-author {
  font-weight: 600;
  color: var(--kpe-text);
}
.dr-body h1, .dr-body h2 {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--kpe-primary-light);
  color: #0f172a;
  font-size: 1.55rem;
}
.dr-body h3 {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
  font-weight: 700;
  margin: 2rem 0 0.75rem;
  color: #1e293b;
  font-size: 1.25rem;
}
.dr-body h4 {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
  color: #334155;
  font-size: 1.1rem;
}
.dr-body p {
  margin: 0.75rem 0 1.25rem;
  text-align: justify;
}
.dr-body blockquote {
  border-left: 4px solid var(--kpe-accent);
  background: linear-gradient(135deg, #faf5ff 0%, #f5f3ff 100%);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--kpe-radius-sm) var(--kpe-radius-sm) 0;
  font-style: italic;
  color: #4a4a6a;
}
.dr-body blockquote strong {
  color: var(--kpe-accent);
  font-style: normal;
}
.dr-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
}
.dr-body th {
  background: var(--kpe-primary);
  color: #fff;
  padding: 0.65rem 0.75rem;
  text-align: left;
  font-weight: 600;
}
.dr-body td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--kpe-border);
}
.dr-body tr:nth-child(even) td {
  background: #f8fafc;
}
.dr-body ul, .dr-body ol {
  margin: 1rem 0;
  padding-left: 1.5rem;
}
.dr-body li {
  margin: 0.4rem 0;
}
.dr-body hr {
  border: none;
  height: 1px;
  background: var(--kpe-border);
  margin: 2.5rem 0;
}
.dr-body strong {
  color: #0f172a;
  font-weight: 700;
}
.dr-body a {
  color: var(--kpe-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.dr-body a:hover {
  color: var(--kpe-accent);
}
.dr-body code {
  background: #f1f5f9;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.88em;
}
.dr-body pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 1.25rem;
  border-radius: var(--kpe-radius-sm);
  overflow-x: auto;
  font-size: 0.88rem;
}
.dr-body pre code {
  background: transparent;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
  color: inherit;
}

/* ── Pygments codehilite 语法高亮 (monokai 风格，适配暗色 pre 背景) ── */
.dr-body .codehilite { background: #0f172a; border-radius: var(--kpe-radius-sm); overflow-x: auto; }
.dr-body .codehilite pre { margin: 0; background: transparent; }
.dr-body .codehilite .hll { background-color: #49483e }
.dr-body .codehilite .c,
.dr-body .codehilite .ch,
.dr-body .codehilite .cm,
.dr-body .codehilite .cpf,
.dr-body .codehilite .c1,
.dr-body .codehilite .cs { color: #75715e }         /* 注释 */
.dr-body .codehilite .cp { color: #75715e }         /* 预处理 */
.dr-body .codehilite .gd { color: #f92672 }         /* diff 删除 */
.dr-body .codehilite .gi { color: #a6e22e }         /* diff 新增 */
.dr-body .codehilite .k,
.dr-body .codehilite .kc,
.dr-body .codehilite .kd,
.dr-body .codehilite .kn,
.dr-body .codehilite .kp,
.dr-body .codehilite .kr { color: #66d9ef }         /* 关键字 */
.dr-body .codehilite .kt { color: #66d9ef }         /* 类型 */
.dr-body .codehilite .nb { color: #f8f8f2 }         /* 内建 */
.dr-body .codehilite .nc { color: #a6e22e }         /* 类名 */
.dr-body .codehilite .nd { color: #a6e22e }         /* 装饰器 */
.dr-body .codehilite .ne { color: #a6e22e }         /* 异常 */
.dr-body .codehilite .nf,
.dr-body .codehilite .fm { color: #a6e22e }         /* 函数 */
.dr-body .codehilite .ni { color: #f8f8f2 }
.dr-body .codehilite .no { color: #66d9ef }         /* 常量 */
.dr-body .codehilite .nn { color: #f8f8f2 }         /* 命名空间 */
.dr-body .codehilite .nt { color: #f92672 }         /* HTML 标签 */
.dr-body .codehilite .na { color: #a6e22e }         /* 属性 */
.dr-body .codehilite .nv,
.dr-body .codehilite .vc,
.dr-body .codehilite .vg,
.dr-body .codehilite .vi { color: #f8f8f2 }         /* 变量 */
.dr-body .codehilite .o,
.dr-body .codehilite .ow { color: #f92672 }         /* 运算符 */
.dr-body .codehilite .p { color: #f8f8f2 }          /* 标点 */
.dr-body .codehilite .s,
.dr-body .codehilite .sa,
.dr-body .codehilite .sb,
.dr-body .codehilite .sc,
.dr-body .codehilite .dl,
.dr-body .codehilite .sd,
.dr-body .codehilite .s2,
.dr-body .codehilite .se,
.dr-body .codehilite .sh,
.dr-body .codehilite .si,
.dr-body .codehilite .sx,
.dr-body .codehilite .sr,
.dr-body .codehilite .s1,
.dr-body .codehilite .ss { color: #e6db74 }         /* 字符串 */
.dr-body .codehilite .m,
.dr-body .codehilite .mb,
.dr-body .codehilite .mf,
.dr-body .codehilite .mh,
.dr-body .codehilite .mi,
.dr-body .codehilite .mo,
.dr-body .codehilite .il { color: #ae81ff }         /* 数字 */
.dr-body .codehilite .ge { font-style: italic }     /* 强调 */
.dr-body .codehilite .gs { font-weight: bold }      /* 加粗 */
.dr-body .codehilite .err { color: #f8f8f0; background-color: transparent } /* 错误token不特殊标记 */

/* 免费预览中禁用链接 */
.dr-preview-locked a {
  pointer-events: none;
  color: inherit;
  text-decoration: none;
  cursor: default;
}

/* 付费支付区域 */
.dr-pay-section {
  text-align: center;
  padding: 0.5rem 0;
}
.dr-pay-section .btn {
  font-size: 1rem;
  padding: 0.6rem 2rem;
}

/* 付费墙遮罩 */
.dr-paywall {
  position: relative;
  margin-top: -6rem;
  padding-top: 8rem;
  background: linear-gradient(to bottom, rgba(248,250,252,0) 0%, rgba(248,250,252,0.85) 30%, rgba(248,250,252,1) 50%);
}
.dr-paywall-inner {
  text-align: center;
  padding: 2.5rem 2rem;
  background: var(--kpe-card-bg);
  border: 2px dashed var(--kpe-border);
  border-radius: var(--kpe-radius);
  max-width: 520px;
  margin: 0 auto;
}
.dr-paywall-inner h3 {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
  font-weight: 700;
  margin-bottom: 0.75rem;
  font-size: 1.15rem;
}
.dr-paywall-inner p {
  color: var(--kpe-text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
}
.dr-paywall-inner .dr-code-input {
  display: flex;
  gap: 0.5rem;
  max-width: 360px;
  margin: 0 auto 1rem;
}
.dr-paywall-inner .dr-code-input input {
  flex: 1;
  border: 1.5px solid var(--kpe-border);
  border-radius: var(--kpe-radius-sm);
  padding: 0.6rem 1rem;
  font-size: 0.95rem;
  text-align: center;
  letter-spacing: 0.05em;
}
.dr-paywall-inner .dr-code-input input:focus {
  outline: none;
  border-color: var(--kpe-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

/* 阅读进度条 */
.dr-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--kpe-primary), var(--kpe-accent));
  z-index: 9999;
  transition: width 0.1s linear;
}

/* 侧边目录导航 */
.dr-toc {
  position: sticky;
  top: 1.5rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
  font-size: 0.85rem;
  max-height: calc(100vh - 3rem);
  overflow-y: auto;
}
.dr-toc .toc-title {
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--kpe-text-muted);
  margin-bottom: 0.75rem;
  padding-left: 0.75rem;
}
.dr-toc a {
  display: block;
  padding: 0.35rem 0.75rem;
  color: var(--kpe-text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all 0.15s ease;
  line-height: 1.4;
}
.dr-toc a:hover,
.dr-toc a.active {
  color: var(--kpe-primary);
  border-left-color: var(--kpe-primary);
  background: var(--kpe-primary-light);
}
.dr-toc a.toc-h3 {
  padding-left: 1.5rem;
  font-size: 0.82rem;
}
/* markdown-toc 自动生成的目录结构 */
.dr-toc .toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.dr-toc .toc li {
  margin: 0;
}
.dr-toc .toc a {
  display: block;
  padding: 0.35rem 0.75rem;
  color: var(--kpe-text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all 0.15s ease;
  line-height: 1.4;
  font-size: 0.85rem;
}
.dr-toc .toc a:hover {
  color: var(--kpe-primary);
  border-left-color: var(--kpe-primary);
  background: var(--kpe-primary-light);
}
.dr-toc .toc ul ul a {
  padding-left: 1.5rem;
  font-size: 0.82rem;
}
.dr-toc .toc ul ul ul a {
  padding-left: 2.25rem;
  font-size: 0.8rem;
}

/* 深读列表卡片 */
.dr-card {
  border: 1px solid var(--kpe-border);
  border-radius: var(--kpe-radius);
  padding: 1.75rem;
  background: var(--kpe-card-bg);
  transition: var(--kpe-transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}
.dr-card:hover {
  box-shadow: var(--kpe-shadow-md);
  transform: translateY(-3px);
  border-color: var(--kpe-primary);
}
.dr-card .dr-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.5;
}
.dr-card .dr-card-title a {
  color: var(--kpe-text);
  text-decoration: none;
}
.dr-card .dr-card-title a:hover {
  color: var(--kpe-primary);
}
.dr-card .dr-card-summary {
  color: var(--kpe-text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
  flex: 1;
  margin-bottom: 1rem;
}
.dr-card .dr-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--kpe-text-muted);
  padding-top: 0.75rem;
  border-top: 1px solid var(--kpe-border);
}

/* 响应式 */
@media (max-width: 992px) {
  .dr-toc-col { display: none !important; }
}
@media (max-width: 768px) {
  .dr-article h1 { font-size: 1.5rem; }
  .dr-article { font-size: 1rem; }
  .dr-body h2 { font-size: 1.3rem; }
}

/* ===== Responsive Adjustments ===== */
@media (max-width: 768px) {
  .kpe-hero {
    padding: 2rem 0 1.5rem;
  }
  .kpe-hero h1 {
    font-size: 1.35rem;
  }
  .kpe-navbar .navbar-brand .brand-logo {
    height: 42px;
    max-width: 130px;
    padding: 2px 5px;
  }
  .kpe-navbar .nav-link {
    padding: 0.75rem 1rem !important;
  }
  .kpe-navbar .nav-link::after {
    display: none;
  }
}