/* ==========================================
   205模板 - 现代化CSS重构版
   针对百度/搜狗SEO优化
   ========================================== */

/* CSS变量定义 */
:root {
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --secondary: #64748B;
  --success: #10B981;
  --danger: #EF4444;
  --warning: #F59E0B;
  --info: #3B82F6;
  
  --text-primary: #1E293B;
  --text-secondary: #64748B;
  --text-muted: #94A3B8;
  
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-hover: #F1F5F9;
  
  --border-color: #E2E8F0;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================
   全局样式重置
   ========================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "Microsoft YaHei", "微软雅黑", "PingFang SC", "Hiragino Sans GB", 
               "STHeiti", "WenQuanYi Micro Hei", -apple-system, BlinkMacSystemFont, 
               "Segoe UI", Arial, sans-serif;
  color: var(--text-primary);
  background: var(--bg-secondary);
  line-height: 1.7;
  padding-top: 64px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 链接样式 */
a {
  color: var(--text-primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--primary);
}

/* 标题样式 */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 0;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ==========================================
   导航栏样式
   ========================================== */
.navbar {
  background: var(--bg-primary) !important;
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--border-color);
  height: 64px;
  padding: 0 1.5rem;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  font-size: 1.125rem;
  transition: var(--transition);
}

.navbar-brand:hover {
  transform: translateY(-1px);
}

.navbar-brand img {
  border-radius: 6px;
}

.navbar-item {
  color: var(--text-secondary);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius-sm);
  transition: var(--transition);
  position: relative;
}

.navbar-item:hover {
  color: var(--primary);
  background: var(--bg-hover);
}

/* ==========================================
   容器和布局
   ========================================== */
.section {
  padding: 2rem 1.5rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.columns {
  display: flex;
  gap: 1.5rem;
  margin: 0;
}

.column {
  flex: 1;
}

/* 主要布局列 */
.column.is-8 {
  flex: 0 0 calc(66.666% - 1rem);
  max-width: calc(66.666% - 1rem);
}

.column.is-4 {
  flex: 0 0 calc(33.333% - 0.5rem);
  max-width: calc(33.333% - 0.5rem);
}

/* 列表项列 - 精选推荐（一行3个） */
.column.is-4 {
  flex: 0 0 calc(33.333% - 1rem);
  max-width: calc(33.333% - 1rem);
}

/* 列表项列 - 最新文章（一行2个） */
.column.is-6 {
  flex: 0 0 calc(50% - 0.75rem);
  max-width: calc(50% - 0.75rem);
}

.is-multiline {
  flex-wrap: wrap;
}

/* ==========================================
   卡片样式 - 现代化设计
   ========================================== */
.card {
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: var(--transition);
  margin-bottom: 1.5rem;
}

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

.card-header {
  background: linear-gradient(135deg, #F8FAFC 0%, #FFFFFF 100%);
  border-bottom: 2px solid var(--border-color);
  padding: 1.25rem 1.5rem;
}

.card-header-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--text-primary);
}

.card-header-title i {
  font-size: 1.25rem;
}

.card-content {
  padding: 1.5rem;
}

/* 卡片内标题 */
.card-content .title {
  margin-bottom: 0.75rem;
  line-height: 1.4;
  font-weight: 600;
}

.card-content .title a {
  color: var(--text-primary);
  transition: var(--transition);
}

.card-content .title a:hover {
  color: var(--primary);
}

.card-content .subtitle {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-top: 0.5rem;
  margin-bottom: 0.75rem;
}

/* ==========================================
   回答项样式 - 完全重构
   ========================================== */
.answer-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
  transition: var(--transition);
}

.answer-item:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

/* 回答头部 - 所有元素在一行 */
.answer-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: nowrap;
}

.answer-user-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
  min-width: 0;
}

.answer-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border-color);
  transition: var(--transition);
  flex-shrink: 0;
}

.answer-avatar:hover {
  border-color: var(--primary);
  transform: scale(1.05);
}

.answer-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex: 1;
  min-width: 0;
}

.answer-username {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  white-space: nowrap;
  flex-shrink: 0;
}

.answer-time {
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.25rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.answer-time i {
  font-size: 0.875rem;
}

.answer-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

/* 点赞按钮 - 美化版 */
.like-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.25rem;
  background: linear-gradient(135deg, #FFF1F2 0%, #FFE4E6 100%);
  border: 2px solid #FECDD3;
  border-radius: 24px;
  color: #E11D48;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(225, 29, 72, 0.15);
  position: relative;
  overflow: hidden;
}

.like-btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(225, 29, 72, 0.1);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.like-btn:hover::before {
  width: 200px;
  height: 200px;
}

.like-btn:hover {
  background: linear-gradient(135deg, #FFE4E6 0%, #FECDD3 100%);
  border-color: #FB7185;
  color: #BE123C;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(225, 29, 72, 0.25);
}

.like-btn:active {
  transform: translateY(0) scale(0.95);
}

.like-btn i {
  font-size: 1rem;
  transition: var(--transition);
  position: relative;
  z-index: 1;
}

.like-btn .like-count {
  position: relative;
  z-index: 1;
  font-weight: 700;
}

.like-btn:hover i {
  animation: heartbeat 0.6s ease-in-out;
  color: #BE123C;
}

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  25% { transform: scale(1.3); }
  50% { transform: scale(1); }
  75% { transform: scale(1.15); }
}

/* 点赞按钮点击后的效果 */
.like-btn.liked {
  background: linear-gradient(135deg, #FCA5A5 0%, #F87171 100%);
  border-color: #EF4444;
  color: white;
  box-shadow: 0 4px 16px rgba(239, 68, 68, 0.4);
}

.like-btn.liked i {
  animation: heartPop 0.4s ease-out;
}

@keyframes heartPop {
  0% { transform: scale(1); }
  50% { transform: scale(1.5); }
  100% { transform: scale(1); }
}

/* 回答内容 - 独占一行 */
.answer-content {
  color: var(--text-primary);
  font-size: 1rem;
  line-height: 1.8;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.answer-content p {
  margin-bottom: 1rem;
}

/* 最佳回答标记 */
.best-answer {
  position: relative;
  border-left: 4px solid var(--warning);
  background: linear-gradient(to right, #FEF3C7 0%, transparent 100%);
}

.best-answer::before {
  content: '最佳回答';
  position: absolute;
  top: -12px;
  left: 16px;
  background: var(--warning);
  color: white;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

/* ==========================================
   侧边栏样式
   ========================================== */
.sidebar-item {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.sidebar-item:last-child {
  border-bottom: none;
}

.sidebar-item:hover {
  background: var(--bg-hover);
  padding-left: 0.75rem;
  border-left: 3px solid var(--primary);
  border-radius: var(--border-radius-sm);
}

.sidebar-item a {
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.5;
  display: block;
  margin-bottom: 0.5rem;
}

.sidebar-item time {
  font-size: 0.8125rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* ==========================================
   标签样式
   ========================================== */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--transition);
}

.tag:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.tag i {
  font-size: 0.875rem;
}

/* 标签颜色变体 */
.tag.is-info {
  background: #DBEAFE;
  border-color: #93C5FD;
  color: #1E40AF;
}

.tag.is-primary {
  background: #E0E7FF;
  border-color: #A5B4FC;
  color: #4338CA;
}

.tag.is-success {
  background: #D1FAE5;
  border-color: #6EE7B7;
  color: #047857;
}

.tag.is-warning {
  background: #FEF3C7;
  border-color: #FCD34D;
  color: #B45309;
}

.tag.is-danger {
  background: #FEE2E2;
  border-color: #FCA5A5;
  color: #B91C1C;
}

.tag.is-light {
  background: var(--bg-secondary);
  border-color: var(--border-color);
  color: var(--text-secondary);
}

/* ==========================================
   面包屑导航 - 美化版
   ========================================== */
.breadcrumb {
  padding: 0;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #F8FAFC 0%, #FFFFFF 100%);
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.breadcrumb ul {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
  flex-wrap: wrap;
  padding: 0.75rem 1rem;
  margin: 0;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0;
}

.breadcrumb li + li::before {
  content: "";
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 5px solid var(--text-muted);
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  margin: 0 0.5rem;
}

.breadcrumb a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  padding: 0.375rem 0.75rem;
  border-radius: 4px;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.breadcrumb a:hover {
  color: var(--primary);
  background: var(--bg-hover);
}

.breadcrumb a::before {
  content: "📍";
  font-size: 0.75rem;
  opacity: 0.6;
}

.breadcrumb li:first-child a::before {
  content: "🏠";
}

.breadcrumb .is-active a {
  color: var(--text-primary);
  font-weight: 600;
  background: var(--bg-hover);
  pointer-events: none;
}

.breadcrumb .is-active a::before {
  opacity: 1;
}

/* ==========================================
   按钮样式
   ========================================== */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  background: var(--bg-primary);
  color: var(--text-primary);
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.button.is-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

.button.is-primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

.button.is-rounded {
  border-radius: 50%;
  width: 50px;
  height: 50px;
  padding: 0;
}

/* ==========================================
   页脚样式
   ========================================== */
.footer {
  background: linear-gradient(135deg, #1E293B 0%, #0F172A 100%);
  color: #E2E8F0;
  padding: 3rem 1.5rem 2rem;
  margin-top: 4rem;
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.1);
}

.footer .content {
  text-align: center;
}

.footer strong {
  color: white;
  font-size: 1.25rem;
  font-weight: 600;
}

.footer p {
  margin: 0.5rem 0;
  opacity: 0.9;
  font-size: 0.9375rem;
}

.footer a {
  color: #E2E8F0;
  transition: var(--transition);
}

.footer a:hover {
  color: white;
}

/* ==========================================
   文章内容样式
   ========================================== */
.article-content {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-primary);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.article-content p {
  margin-bottom: 1.5rem;
}

.article-content img {
  border-radius: var(--border-radius);
  margin: 1.5rem 0;
  box-shadow: var(--shadow-sm);
}

.article-content h1,
.article-content h2,
.article-content h3 {
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.article-content ul,
.article-content ol {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

/* ==========================================
   动画效果
   ========================================== */
.fade-in-up {
  animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================
   工具类
   ========================================== */
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-5 { margin-top: 1.5rem; }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: 0.5rem; }
.mr-1 { margin-right: 0.25rem; }
.mr-2 { margin-right: 0.5rem; }
.ml-1 { margin-left: 0.25rem; }
.ml-2 { margin-left: 0.5rem; }

.has-text-centered { text-align: center; }
.has-text-grey { color: var(--text-secondary); }
.has-text-grey-light { color: var(--text-muted); }
.has-text-dark { color: var(--text-primary); }
.has-text-primary { color: var(--primary); }
.has-text-info { color: var(--info); }
.has-text-success { color: var(--success); }
.has-text-warning { color: var(--warning); }
.has-text-danger { color: var(--danger); }

.is-size-6 { font-size: 0.9375rem; }
.is-size-7 { font-size: 0.8125rem; }

/* ==========================================
   响应式设计
   ========================================== */
@media screen and (max-width: 1023px) {
  .columns {
    flex-direction: column;
  }
  
  .column.is-8,
  .column.is-4,
  .column.is-6 {
    flex: 1;
    max-width: 100%;
  }
  
  /* 平板：精选推荐一行2个 */
  .is-multiline .column.is-4 {
    flex: 0 0 calc(50% - 0.75rem);
    max-width: calc(50% - 0.75rem);
  }
  
  /* 平板：最新文章一行2个 */
  .is-multiline .column.is-6 {
    flex: 0 0 calc(50% - 0.75rem);
    max-width: calc(50% - 0.75rem);
  }
  
  .navbar-menu {
    background: var(--bg-primary);
    padding: 1rem;
    box-shadow: var(--shadow-md);
  }
  
  .section {
    padding: 1.5rem 1rem;
  }
}

@media screen and (max-width: 768px) {
  body {
    font-size: 15px;
    padding-top: 56px;
  }
  
  .navbar {
    height: 56px;
    padding: 0 0.75rem;
  }
  
  /* 移动端：减少容器内边距 */
  .section {
    padding: 1rem 0.5rem;
  }
  
  .container {
    padding: 0 0.5rem;
  }
  
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.375rem; }
  h3 { font-size: 1.125rem; }
  
  /* 移动端：减少卡片内边距 */
  .card {
    margin-bottom: 1rem;
  }
  
  .card-content {
    padding: 0.875rem;
  }
  
  .card-header {
    padding: 0.75rem 0.875rem;
  }
  
  .card-header-title {
    font-size: 1.125rem;
  }
  
  /* 移动端：减少回答项内边距 */
  .answer-item {
    padding: 0.875rem;
  }
  
  /* 移动端：头像、昵称、时间、点赞保持一行 */
  .answer-header {
    gap: 0.5rem;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 0.625rem;
    margin-bottom: 0.75rem;
  }
  
  .answer-user-info {
    gap: 0.5rem;
    min-width: 0;
  }
  
  .answer-avatar {
    width: 36px;
    height: 36px;
  }
  
  .answer-meta {
    gap: 0.5rem;
    flex-direction: row;
    align-items: center;
  }
  
  .answer-username {
    font-size: 0.9375rem;
  }
  
  .answer-time {
    font-size: 0.8125rem;
  }
  
  /* 移动端点赞按钮 */
  .like-btn {
    padding: 0.4rem 0.875rem;
    font-size: 0.8125rem;
    gap: 0.375rem;
    white-space: nowrap;
  }
  
  .like-btn i {
    font-size: 0.875rem;
  }
  
  /* 移动端：减少列间距 */
  .columns {
    gap: 1rem;
  }
  
  /* 移动端：面包屑优化 */
  .breadcrumb {
    margin-bottom: 1rem;
  }
  
  .breadcrumb ul {
    padding: 0.5rem 0.75rem;
  }
  
  .breadcrumb a {
    padding: 0.25rem 0.5rem;
    font-size: 0.8125rem;
  }
  
  .breadcrumb a::before {
    font-size: 0.625rem;
  }
  
  /* 移动端：标签优化 */
  .tags {
    gap: 0.375rem;
    margin: 0.75rem 0;
  }
  
  .tag {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
  }
  
  /* 移动端：侧边栏项优化 */
  .sidebar-item {
    padding: 0.75rem 0;
  }
  
  /* 移动端：文章内容优化 */
  .article-content {
    font-size: 1rem;
    line-height: 1.7;
  }
  
  /* 移动端：页脚优化 */
  .footer {
    padding: 2rem 0.75rem 1.5rem;
    margin-top: 2rem;
  }
  
  .footer p {
    font-size: 0.875rem;
  }
}

/* 超小屏幕优化 (≤ 480px) */
@media screen and (max-width: 480px) {
  body {
    padding-top: 52px;
  }
  
  .navbar {
    height: 52px;
    padding: 0 0.5rem;
  }
  
  /* 超小屏：进一步减少内边距 */
  .section {
    padding: 0.75rem 0.25rem;
  }
  
  .container {
    padding: 0 0.25rem;
  }
  
  .card {
    border-radius: var(--border-radius-sm);
    margin-bottom: 0.75rem;
  }
  
  .card-content {
    padding: 0.75rem;
  }
  
  .card-header {
    padding: 0.625rem 0.75rem;
  }
  
  .card-header-title {
    font-size: 1rem;
    gap: 0.5rem;
  }
  
  .card-header-title i {
    font-size: 1rem;
  }
  
  .answer-item {
    padding: 0.75rem;
    border-radius: var(--border-radius-sm);
  }
  
  .answer-header {
    gap: 0.375rem;
    padding-bottom: 0.5rem;
    margin-bottom: 0.625rem;
  }
  
  .answer-avatar {
    width: 32px;
    height: 32px;
  }
  
  .answer-username {
    font-size: 0.875rem;
  }
  
  .answer-time {
    font-size: 0.75rem;
  }
  
  .like-btn {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
  }
  
  .breadcrumb ul {
    padding: 0.375rem 0.5rem;
  }
  
  .breadcrumb a {
    padding: 0.25rem 0.375rem;
    font-size: 0.75rem;
  }
  
  .breadcrumb li + li::before {
    border-left-width: 4px;
    border-top-width: 3px;
    border-bottom-width: 3px;
    margin: 0 0.25rem;
  }
  
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.25rem; }
  h3 { font-size: 1rem; }
  
  .columns {
    gap: 0.75rem;
  }
  
  .footer {
    padding: 1.5rem 0.5rem 1rem;
  }
}

/* ==========================================
   可访问性优化
   ========================================== */
a:focus,
button:focus,
.button:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 10px;
  transition: var(--transition);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ==========================================
   打印样式
   ========================================== */
@media print {
  .navbar,
  .footer,
  .answer-actions,
  .like-btn {
    display: none;
  }
  
  body {
    padding-top: 0;
    background: white;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}