/* ====================== Brand / Logo ====================== */


/* 自定义 Logo 样式 */
.navbar-logo {
  height: 55px; /* 建议的高度，可根据您的设计调整 */
  width: auto; /* 保持图片原始宽高比 */
}

/* 针对品牌文字的样式 */
.navbar-brand .logo-text {
  font-size: 1.5rem; /* Bootstrap 5 默认的 navbar-brand 字体大小通常是 1.25rem - 1.5rem */
  font-weight: 700; /* 加粗 */
  color: var(--bs-navbar-color); /* 使用 Bootstrap 导航栏的默认文字颜色变量，确保主题适配 */
  /* 或者直接用您网站的主题色 */
  /* color: #1a2b4c; */
  line-height: 1; /* 有时候需要调整行高以更好地垂直对齐 */
}

/* 响应式调整 (可选，但推荐) */
@media (max-width: 575.98px) { /* 在 extra small 屏幕上 (xs，即手机竖屏) */
  .navbar-logo {
    height: 35px; /* 在手机上可以稍微缩小 */
  }
}

/* ====================== Navbar Base ====================== */
#siteNav.navbar{
  position:relative;
  z-index:1060;
  background:#fff;
  box-shadow:0 2px 10px rgba(0,0,0,.1);
  padding:1rem 0;
  transition:.3s;
}
#siteNav .navbar-brand{ font-weight:700; font-size:1.5rem; color:#333; }

/* nav links */
#siteNav .navbar-nav .nav-link{
  color:#333; font-weight:500;
  margin:0 .5rem; padding:.5rem 1rem;
  border-radius:6px; transition:.3s;
}
#siteNav .navbar-nav .nav-link:hover{
  color:#0d6efd; background:rgba(13,110,253,.1);
  transform:translateY(-1px);
}
#siteNav .navbar-nav .nav-link.active{
  color:#0d6efd; background:rgba(13,110,253,.1);
}

/* ====================== Split Toggle（父级 + 小三角）====================== */
#siteNav .navbar-nav .nav-item.dropdown{
  position:relative;
}
#siteNav .navbar-nav .nav-item.dropdown > .nav-link{
  white-space:nowrap;
  margin-right:0;
}
#siteNav .navbar-nav .dropdown-toggle-split{
  display:inline-flex; align-items:center; justify-content:center;
  line-height:1; flex:0 0 auto; white-space:nowrap;
  border:0; background:transparent;
}
.navbar .dropdown-toggle-split{ padding-left:.25rem; padding-right:.25rem; }


/* ================== Layout Control Area ================== */
@media (min-width:992px){
  #siteNav .navbar-nav{ flex-wrap:nowrap; }
  #siteNav .navbar-nav .nav-item.dropdown{ 
    display:flex; 
    align-items:center;
    gap:.1rem; 
  }
  #siteNav .navbar-nav .nav-item.dropdown > .nav-link{ padding-right:.25rem; }
  #siteNav .navbar-nav .dropdown-toggle-split{ margin-left:0; padding:0 .25rem; }
}
@media (max-width:991.98px){
  #siteNav.navbar{ padding:.5rem 0; }
  #siteNav .navbar-nav .nav-item { width: 100%; }
  #siteNav .navbar-nav .nav-link{ margin:.25rem 0; text-align:center; }
  #siteNav .navbar-nav .nav-item.dropdown {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: .25rem;
  }
}

/* ====================== Dropdown ====================== */
#siteNav .dropdown-toggle::after{ transition:transform .3s; }
#siteNav .dropdown:hover .dropdown-toggle::after{ transform:rotate(180deg); }

@media (min-width:992px){
  #siteNav .navbar-nav .nav-item.dropdown > .dropdown-menu{
    position:absolute; top:100%; left:0;
    margin:0;
    z-index:1060;
    background:#fff;
    border:1px solid rgba(0,0,0,.1);
    box-shadow:0 5px 15px rgba(0,0,0,.1);
    border-radius:8px;
    transform-origin:top center;
    animation:slideDown .3s ease;
  }
  #siteNav .navbar-nav .nav-item.dropdown > .dropdown-menu::before{
    content:""; position:absolute; left:0; right:0; top:-8px; height:8px;
  }
}
#siteNav .dropdown-item{
  padding:.75rem 1.25rem; transition:.2s;
  border-radius:4px; margin:.125rem .5rem;
}
#siteNav .dropdown-item:hover{ background:rgba(13,110,253,.1); color:#0d6efd; }

@keyframes slideDown{ from{opacity:0; transform:translateY(-10px)} to{opacity:1; transform:translateY(0)} }

@media (min-width:992px){
  #siteNav .dropdown:hover > .dropdown-menu,
  #siteNav .nav-item.dropdown > .dropdown-menu:hover{ display:block; }
  #siteNav .navbar-nav{ margin:0 auto; }
  #siteNav .navbar-collapse{ justify-content:center; }
}

@media (max-width: 991.98px){
  #siteNav .navbar-collapse .dropdown-menu.show {
    position: static !important;
    float: none !important;
    width: 100% !important;
    margin-top: 0.125rem !important;
    padding: 0 !important;
    background-color: transparent !important;
    border: none !important;
    box-shadow: none !important;
    animation: none !important;
  }
  #siteNav .navbar-collapse .dropdown-item {
    text-align: center !important;
    padding-left: 2rem !important;
  }
}

/* ====================== Form / Button ====================== */
#siteNav .form-control{ border:1px solid #e0e0e0; border-radius:6px; padding:.5rem 1rem; transition:.3s; width:200px; }
#siteNav .form-control:focus{ border-color:#0d6efd; box-shadow:0 0 0 .2rem rgba(13,110,253,.25); }
#siteNav .btn-outline-primary{ border:1px solid #0d6efd; color:#0d6efd; border-radius:6px; padding:.5rem 1rem; transition:.3s; }
#siteNav .btn-outline-primary:hover{ background:#0d6efd; color:#fff; transform:translateY(-1px); }

/* ====================== Animation ====================== */
#siteNav .navbar-nav .nav-item{ animation:fadeInUp .4s ease forwards; opacity:0; transform:translateY(10px) }
#siteNav .navbar-nav .nav-item:nth-child(1){animation-delay:.1s}
#siteNav .navbar-nav .nav-item:nth-child(2){animation-delay:.2s}
#siteNav .navbar-nav .nav-item:nth-child(3){animation-delay:.3s}
#siteNav .navbar-nav .nav-item:nth-child(4){animation-delay:.4s}
@keyframes fadeInUp{ to{ opacity:1; transform:translateY(0) } }

/* ====================== Search Section ====================== */
.site-search{ background:var(--bs-body-tertiary); padding:2rem 0; border-top:1px solid #e0e0e0; border-bottom:1px solid #e0e0e0; }
.site-search .search-pill{ max-width:820px; margin:0 auto; border-radius:999px; background:#fff; box-shadow:0 .25rem .75rem rgba(0,0,0,.06); padding:.625rem .5rem; display:flex; align-items:center; gap:.5rem; }
.site-search .search-icon{ width:2rem; height:2rem; color:#6c757d; display:inline-flex; align-items:center; justify-content:center; }
.site-search .search-input{ height:2.75rem; border:0; flex:1 1 auto; box-shadow:none; padding-left:.25rem; }
.site-search .search-input:focus{ box-shadow:none; outline:none; }
.site-search .search-pill:focus-within{ outline:none; box-shadow:0 0 0 .25rem rgba(13,110,253,.12); border:1px solid rgba(13,110,253,.35); }
.site-search .search-btn{ height:2.25rem; border-radius:999px; padding:0 1rem; }
.site-search, .site-search .container{ overflow:visible; }

@media (max-width:767.98px){
  .site-search .search-pill{ background:transparent; box-shadow:none; border:0; padding:0; gap:0; border-radius:0; flex-direction:column; }
  .site-search .search-icon{ display:none !important; }
  .site-search .search-input{ display:block; width:100%; height:48px; padding:0 14px; border:1px solid #d0d7de; border-radius:12px; background:#f7f9fc; font-size:16px; box-shadow:none; margin-bottom:.5rem; }
  .site-search .search-input::placeholder{ color:#98a2b3; opacity:1; }
  .site-search .search-input:focus{ outline:none; background:#fff; border-color:#0d6efd; box-shadow:0 0 0 3px rgba(13,110,253,.15); }
  .site-search .search-btn{ width:100%; height:48px; border-radius:12px; }
  .site-search .search-pill:focus-within{ box-shadow:none; border:0; }
}

/* ====================== Main / Sidebar / Cards ====================== */
.main-content{ background:#f8f9fa; padding:2rem 0; }

.content-header{ margin-bottom:.75rem; }
.content-header h1{ margin-bottom:.35rem; }
.breadcrumb{ margin-bottom:.25rem; font-size:.875rem; }

/* Grid layout for the main content area */
.col-md-9.col-lg-9 > .row{ display:grid; grid-template-columns:1fr; gap:1.5rem; /* Increased gap */ margin:0; }
@media (min-width:768px){ .col-md-9.col-lg-9 > .row{ grid-template-columns:repeat(2,1fr); } }
@media (min-width:992px){ .col-md-9.col-lg-9 > .row{ grid-template-columns:repeat(3,minmax(0,1fr)); } }
.col-md-9.col-lg-9 > .row > [class^="col-"], .col-md-9.col-lg-9 > .row > [class*=" col-"]{ padding:0; width:auto; }


/* ================== [OPTIMIZED] Card Styles ================== */
.card {
  border: 1px solid #eef2f7; /* Softer border color */
  border-radius: 12px; /* Larger radius for a modern look */
  box-shadow: 0 4px 15px rgba(0,0,0,0.05); /* Softer shadow */
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  background-color: #fff;
  height: 100%;
  margin: 0;
  display: flex;
  flex-direction: column; /* Ensure flex direction is column */
}
.card:hover {
  transform: translateY(-5px); /* More pronounced hover effect */
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08); /* Deeper shadow on hover */
}
.card-body {
  padding: 1rem 1.25rem; /* Adjusted padding */
  display: flex;
  flex-direction: column;
  height: 100%; /* Make card-body take full height of the card */
}

/* Card Header (Avatar + Title) */
.card .d-flex.align-items-center {
  align-items: flex-start !important;
}
.card-title {
  margin-bottom: 0.1rem !important; /* Reduced margin */
  font-size: 1.1rem; /* Slightly larger title */
}
.card-title a {
  color: #212529 !important;
  text-decoration: none !important;
  transition: color 0.2s;
}
.card-title a:hover {
  color: #0d6efd !important;
}

/* Card Subtitle (Author) */
.card-subtitle {
  margin: 0 0 1rem !important; /* Increased bottom margin for spacing */
  font-size: 0.8rem;
  color: #6c757d;
}

/* Card Text (Description) */
.card-text {
  margin: 0 0 1rem !important;
  font-size: 0.9rem;
  color: #6c757d;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3; /* Max 3 lines for description */
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* [NEW] Card Footer Meta (Category + Views) */
.card-footer-meta {
  font-size: 0.85rem;
  color: #6c757d;
  padding-top: 0.75rem;
  margin-top: auto; /* Pushes this block to the bottom of the card */
  border-top: 1px solid #f1f1f1;
}
.category-tag {
  display: inline-block;
  padding: .25rem .6rem;
  border-radius: 6px;
  background-color: #f8f9fa;
  color: #6c757d !important;
  text-decoration: none;
  font-weight: 500;
  transition: background-color 0.2s, color 0.2s;
}
.category-tag:hover {
  background-color: #e7f1ff;
  color: #0d6efd !important;
}
.view-count {
  display: flex;
  align-items: center;
}
.view-count i {
  margin-right: 5px;
  color: #adb5bd;
}

/* Avatar Styles */
.avatar{ width:40px; height:40px; line-height:40px; border-radius:50%; flex-shrink: 0; text-align:center; color:#fff; margin-right: 12px; }
.avatar.s{ background:#ff9800; } .avatar.g{ background:#4caf50; } .avatar.b{ background:#2196f3; } .avatar.r{ background:#9c27b0; } .avatar.h{ background:#f44336; }


/* ====================== Pagination ====================== */
.pagination{ justify-content:center; margin-top:1.25rem; }
.page-item.active .page-link{ background:#0d6efd; border-color:#0d6efd; color:#fff; }
.page-item .page-link{ border-color:#e0e0e0; transition:.2s; }
.page-item .page-link:hover{ background:#f8f9fa; border-color:#0d6efd; }

/* ====================== Footer ====================== */
footer{ background:#343a40; color:#fff; margin-top:2rem; }
footer a{ color:rgba(255,255,255,.8); text-decoration:none; }
footer a:hover{ color:#fff; text-decoration:underline; }

/* ====================== Utilities ====================== */
.text-muted{ color:#6c757d !important; }
.bg-light{ background:#f8f9fa !important; }
.border-top{ border-top:1px solid #dee2e6 !important; }
.border-bottom{ border-bottom:1px solid #dee2e6 !important; }
.py-5{ padding-top:3rem !important; padding-bottom:3rem !important; }
.py-3{ padding-top:1rem !important; padding-bottom:1rem !important; }

/*
==========================================================================
=                SIDEBAR NAVIGATION STYLES (FINAL VERSION)               =
==========================================================================
*/

/* 1. Sidebar General Styles */
.sidebar{ 
  background:#fff; 
  border-radius:8px; 
  box-shadow:0 2px 10px rgba(0,0,0,.1); 
  padding:1rem; 
  margin-bottom:2rem; 
  border:1px solid #e0e0e0; 
}
.sidebar h5{ 
  margin-top:0; 
  margin-bottom:1rem; 
  color:#333; 
  font-weight:600; 
}
.sidebar .category-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

/* 2. Primary Category Item (Container for link + toggle) */
.sidebar .list-group-item.d-flex {
  padding: 0;
  border-bottom: 1px solid #f0f0f0;
}
.sidebar .category-list > .list-group-item:last-of-type,
.sidebar .category-list > div:last-of-type.list-group-item {
  border-bottom: none;
}


/* 3. Primary Category Link (The clickable title) */
.category-link {
  flex-grow: 1;
  padding: 0.85rem 0.5rem 0.85rem 1.1rem;
  color: #343a40 !important;
  text-decoration: none !important;
  transition: color .2s, background-color .2s;
}
.category-link:hover {
  color: #0d6efd !important;
  background-color: #f8f9fa;
}


/* 4. Collapse Toggle Button (The arrow) */
.collapse-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 50px;
  align-self: stretch;
  color: #6c757d;
  text-decoration: none;
  transition: background-color .2s, color .2s;
  border-left: 1px solid #f0f0f0;
}
.collapse-toggle:hover {
  background-color: #f8f9fa;
  color: #0d6efd;
}
.collapse-toggle i {
  transition: transform 0.3s ease-in-out;
}
.collapse-toggle[aria-expanded="true"] i {
  transform: rotate(-180deg);
}


/* 5. Secondary Category Link (Inside the collapse area) */
.sidebar .collapse .list-group-item {
  padding-left: 2rem !important;
  font-size: 0.925em;
  border-bottom: none;
  color: #343a40;
  text-decoration: none;
  transition: color .2s, background-color .2s;
}
.sidebar .collapse .list-group-item:hover {
  color: #0d6efd !important;
  background-color: #f8f9fa;
}


/* 6. Active State Styles (Highlighting) */
.category-link.active, 
.category-link.active-parent {
  color: #0d6efd !important;
  font-weight: 600;
}
.collapse .list-group-item.active {
  color: #0d6efd !important;
  font-weight: 600;
  background-color: #f8f9fa;
}
.collapse-toggle.active-parent {
  color: #0d6efd;
}

/* ====================== Responsive Adjustments ====================== */
@media (max-width:991.98px){ 
  .sidebar{ margin-bottom:1rem; } 
  .main-content{ padding:1.25rem 0; } 
}
@media (max-width:767.98px){ 
  .sidebar{ width:100%; margin-bottom:1rem; } 
  .content-header h1{ font-size:1.5rem; } 
  .col-md-9.col-lg-9 > .row{ grid-template-columns:1fr; gap:1.5rem; } 
}