/* ============================================
   博客系统 - 全局样式
   ============================================ */

/* ----- CSS 变量（浅色模式） ----- */
:root {
  --bg-primary: #F8F9FA;
  --bg-card: #FFFFFF;
  --bg-navbar: rgba(255, 255, 255, 0.75);
  --bg-tag: #EEF2FF;
  --bg-tag-hover: #E0E7FF;
  --bg-tag-active: #4F46E5;
  --bg-input: #FFFFFF;
  --bg-modal-overlay: rgba(0, 0, 0, 0.4);
  --bg-code: #F1F5F9;

  --text-primary: #1F2937;
  --text-secondary: #6B7280;
  --text-tertiary: #9CA3AF;
  --text-tag: #4F46E5;
  --text-tag-active: #FFFFFF;
  --text-on-primary: #FFFFFF;

  --color-primary: #4F46E5;
  --color-primary-hover: #4338CA;
  --color-primary-light: #EEF2FF;
  --color-danger: #EF4444;
  --color-danger-hover: #DC2626;
  --color-danger-light: #FEE2E2;

  --border-color: #E5E7EB;
  --border-focus: #4F46E5;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-card-hover: 0 8px 25px rgba(79, 70, 229, 0.12);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1200px;
  --navbar-height: 68px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.35s ease;
}

/* ----- CSS 变量（深色模式） ----- */
[data-theme="dark"] {
  --bg-primary: #0B1120;
  --bg-card: #1A2332;
  --bg-navbar: rgba(15, 23, 42, 0.8);
  --bg-tag: #1E293B;
  --bg-tag-hover: #334155;
  --bg-tag-active: #6366F1;
  --bg-input: #1A2332;
  --bg-modal-overlay: rgba(0, 0, 0, 0.6);
  --bg-code: #1E293B;

  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-tertiary: #64748B;
  --text-tag: #A5B4FC;
  --text-tag-active: #FFFFFF;
  --text-on-primary: #FFFFFF;

  --color-primary: #818CF8;
  --color-primary-hover: #6366F1;
  --color-primary-light: rgba(129, 140, 248, 0.1);
  --color-danger: #F87171;
  --color-danger-hover: #EF4444;
  --color-danger-light: rgba(248, 113, 113, 0.1);

  --border-color: #1E293B;
  --border-focus: #818CF8;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 8px 25px rgba(129, 140, 248, 0.15);
}

/* ----- 重置样式 ----- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color var(--transition-slow), color var(--transition-slow);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  font-size: inherit;
}

input, textarea {
  font-family: inherit;
  font-size: inherit;
}

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

ul, ol {
  list-style: none;
}

/* ----- 滚动条美化 ----- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--text-tertiary);
  border-radius: 3px;
}

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

/* ============================================
   导航栏
   ============================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--navbar-height);
  background: var(--bg-navbar);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-slow), border-color var(--transition-slow);
}

.navbar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  transition: color var(--transition-normal);
  flex-shrink: 0;
}

.navbar-brand:hover {
  color: var(--color-primary);
}

.brand-icon {
  color: var(--color-primary);
}

.navbar-center {
  flex: 1;
  max-width: 480px;
  margin: 0 16px;
}

.search-wrapper {
  position: relative;
  width: 100%;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
  transition: color var(--transition-normal);
}

.search-input {
  width: 100%;
  height: 40px;
  padding: 0 16px 0 40px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 14px;
  transition: all var(--transition-normal);
  outline: none;
}

.search-input::placeholder {
  color: var(--text-tertiary);
}

.search-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

[data-theme="dark"] .search-input:focus {
  box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.15);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* ----- 图标按钮 ----- */
.icon-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-normal);
}

.icon-btn:hover {
  background: var(--bg-tag);
  color: var(--text-primary);
}

/* ============================================
   按钮
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  white-space: nowrap;
  line-height: 1;
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

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

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.btn-danger {
  background: var(--color-danger);
  color: #FFFFFF;
  border: 1px solid var(--color-danger);
}

.btn-danger:hover {
  background: var(--color-danger-hover);
  border-color: var(--color-danger-hover);
}

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

.btn-danger-outline:hover {
  background: var(--color-danger-light);
  border-color: var(--color-danger-hover);
}

.btn-back {
  color: var(--text-secondary);
  padding: 8px 0;
  margin-bottom: 8px;
}

.btn-back:hover {
  color: var(--color-primary);
}

/* ============================================
   主内容区
   ============================================ */

.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--navbar-height) + 24px) 24px 60px;
  min-height: 100vh;
}

/* ============================================
   标签栏
   ============================================ */

.tags-section {
  margin-bottom: 28px;
}

.tags-wrapper {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0;
  scrollbar-width: none;
}

.tags-wrapper::-webkit-scrollbar {
  display: none;
}

.tag {
  flex-shrink: 0;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 500;
  border-radius: 999px;
  background: var(--bg-tag);
  color: var(--text-tag);
  transition: all var(--transition-normal);
  border: 1px solid transparent;
}

.tag:hover {
  background: var(--bg-tag-hover);
  transform: translateY(-1px);
}

.tag-active {
  background: var(--bg-tag-active) !important;
  color: var(--text-tag-active) !important;
  border-color: transparent !important;
}

/* ============================================
   文章列表区域
   ============================================ */

.articles-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 20px;
}

.section-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
}

.article-count {
  font-size: 14px;
  color: var(--text-tertiary);
}

/* ============================================
   文章卡片栅格
   ============================================ */

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), #8B5CF6);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

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

.article-card:hover::before {
  opacity: 1;
}

.article-card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.article-card-tag {
  font-size: 11px;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--bg-tag);
  color: var(--text-tag);
}

.article-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-summary {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-tertiary);
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.article-card-footer-left {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ============================================
   空状态
   ============================================ */

.empty-state, .search-empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-tertiary);
}

.empty-state svg, .search-empty-state svg {
  margin-bottom: 20px;
  opacity: 0.4;
}

.empty-state h3, .search-empty-state h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.empty-state p, .search-empty-state p {
  font-size: 14px;
}

/* ============================================
   文章详情
   ============================================ */

.article-detail {
  max-width: 800px;
  margin: 0 auto;
  animation: fadeInUp 0.4s ease;
}

.article-detail-header {
  margin-bottom: 24px;
}

.article-detail-meta {
  display: flex;
  gap: 16px;
  font-size: 14px;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

.detail-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 16px;
}

.detail-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.detail-tags .tag {
  cursor: default;
}

.detail-actions {
  display: flex;
  gap: 12px;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.detail-actions .btn {
  padding: 8px 18px;
  font-size: 13px;
}

.detail-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-primary);
}

/* ============================================
   Markdown 内容样式
   ============================================ */

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  margin-top: 1.5em;
  margin-bottom: 0.6em;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
}

.markdown-body h1 { font-size: 28px; }
.markdown-body h2 { font-size: 24px; }
.markdown-body h3 { font-size: 20px; }
.markdown-body h4 { font-size: 18px; }

.markdown-body p {
  margin-bottom: 1.2em;
}

.markdown-body strong {
  font-weight: 600;
}

.markdown-body em {
  font-style: italic;
}

.markdown-body blockquote {
  padding: 12px 20px;
  margin: 1.2em 0;
  border-left: 4px solid var(--color-primary);
  background: var(--bg-tag);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
}

.markdown-body code {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.9em;
  padding: 2px 8px;
  background: var(--bg-code);
  border-radius: 4px;
  color: var(--color-primary);
}

.markdown-body pre {
  margin: 1.2em 0;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

.markdown-body pre code {
  padding: 0;
  background: none;
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.6;
}

.markdown-body ul,
.markdown-body ol {
  margin: 1em 0;
  padding-left: 24px;
}

.markdown-body ul li {
  list-style: disc;
  margin-bottom: 4px;
}

.markdown-body ol li {
  list-style: decimal;
  margin-bottom: 4px;
}

.markdown-body a {
  color: var(--color-primary);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-normal);
}

.markdown-body a:hover {
  border-bottom-color: var(--color-primary);
}

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 2em 0;
}

.markdown-body img {
  border-radius: var(--radius-md);
  margin: 1.2em 0;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2em 0;
}

.markdown-body th,
.markdown-body td {
  padding: 10px 16px;
  border: 1px solid var(--border-color);
  text-align: left;
}

.markdown-body th {
  background: var(--bg-tag);
  font-weight: 600;
}

/* ============================================
   表单
   ============================================ */

.form-container {
  max-width: 800px;
  margin: 0 auto;
  animation: fadeInUp 0.4s ease;
}

.form-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 32px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 15px;
  transition: all var(--transition-normal);
  outline: none;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

[data-theme="dark"] .form-input:focus,
[data-theme="dark"] .form-textarea:focus {
  box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.15);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-tertiary);
}

.form-textarea {
  min-height: 400px;
  resize: vertical;
  line-height: 1.7;
}

.form-hint {
  display: block;
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 6px;
}

.form-preview {
  margin-bottom: 24px;
}

.form-preview label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.preview-content {
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  min-height: 120px;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding-top: 8px;
}

/* ============================================
   模态框
   ============================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--bg-modal-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: fadeIn 0.2s ease;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 420px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  animation: scaleIn 0.25s ease;
}

.modal-header {
  padding: 24px 24px 0;
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 600;
}

.modal-body {
  padding: 16px 24px 24px;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.5;
}

.modal-footer {
  padding: 0 24px 24px;
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* ============================================
   页脚
   ============================================ */

.footer {
  border-top: 1px solid var(--border-color);
  padding: 24px 0;
  transition: border-color var(--transition-slow);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
  font-size: 14px;
  color: var(--text-tertiary);
}

/* ============================================
   动画
   ============================================ */

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ============================================
   工具类
   ============================================ */

.hidden {
  display: none !important;
}

/* ============================================
   响应式设计
   ============================================ */

/* 平板端（768px ~ 1024px） */
@media (max-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .navbar-center {
    max-width: 320px;
  }

  .detail-title {
    font-size: 28px;
  }
}

/* 手机端（< 768px） */
@media (max-width: 768px) {
  :root {
    --navbar-height: 60px;
  }

  .navbar-inner {
    padding: 0 16px;
    gap: 8px;
  }

  .navbar-brand span {
    display: none;
  }

  .navbar-center {
    max-width: none;
    margin: 0 8px;
  }

  .navbar-actions .btn span {
    display: none;
  }

  .navbar-actions .btn {
    padding: 10px;
  }

  .main-content {
    padding: calc(var(--navbar-height) + 16px) 16px 40px;
  }

  .articles-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .article-card {
    padding: 20px;
  }

  .article-card-title {
    font-size: 17px;
  }

  .detail-title {
    font-size: 24px;
  }

  .form-title {
    font-size: 22px;
  }

  .form-textarea {
    min-height: 280px;
  }

  .detail-actions {
    flex-direction: column;
  }

  .detail-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .form-actions {
    flex-direction: column-reverse;
  }

  .form-actions .btn {
    width: 100%;
    justify-content: center;
  }
}

/* 小屏幕手机（< 480px） */
@media (max-width: 480px) {
  .tags-section {
    margin-bottom: 20px;
  }

  .articles-header {
    flex-direction: column;
    gap: 4px;
  }

  .section-title {
    font-size: 18px;
  }
}

/* 打印样式 */
@media print {
  .navbar,
  .tags-section,
  .detail-actions,
  .footer {
    display: none;
  }

  .main-content {
    padding: 0;
  }

  .article-detail {
    max-width: none;
  }
}