/* ========================================
   DevLog - 技术极简风主题
   CSS 自定义属性驱动明暗主题
   ======================================== */

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

/* ---------- 主题变量 ---------- */
:root {
  /* 亮色主题 */
  --bg-primary: #f8f9fa;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-code: #f1f3f5;
  --text-primary: #1a1a2e;
  --text-secondary: #6c757d;
  --text-muted: #adb5bd;
  --border-color: #e9ecef;
  --accent-start: #3a7bd5;
  --accent-end: #00d2ff;
  --accent: #3a7bd5;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --tag-bg: #e7f5ff;
  --tag-text: #1971c2;
  --header-bg: rgba(255,255,255,0.85);
  --header-blur: blur(12px);
  --divider: #e9ecef;
}

[data-theme="dark"] {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #1e1e36;
  --bg-code: #252540;
  --text-primary: #e4e4ed;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --border-color: #2d2d4a;
  --accent-start: #00d2ff;
  --accent-end: #3a7bd5;
  --accent: #00d2ff;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --tag-bg: #1a2d4a;
  --tag-text: #60a5fa;
  --header-bg: rgba(15,15,26,0.85);
  --header-blur: blur(12px);
  --divider: #2d2d4a;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background 0.3s ease, color 0.3s ease;
}

a { color: var(--accent); text-decoration: none; }
img { max-width: 100%; height: auto; }

/* ---------- 头部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: var(--header-blur);
  -webkit-backdrop-filter: var(--header-blur);
  border-bottom: 1px solid var(--border-color);
  transition: background 0.3s ease;
}

.header-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
}

.logo-icon {
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-family: "Fira Code", "Consolas", monospace;
  font-size: 1.3rem;
}

.logo-text {
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.site-nav {
  display: flex;
  gap: 24px;
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 4px 0;
  position: relative;
  transition: color 0.2s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  border-radius: 1px;
}

/* ---------- 主题切换按钮 ---------- */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 6px;
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  transition: all 0.2s;
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

/* 默认显示月亮图标（在深色模式下） */
[data-theme="dark"] .icon-sun  { display: none; }
[data-theme="dark"] .icon-moon { display: block; }
[data-theme="light"] .icon-sun  { display: block; }
[data-theme="light"] .icon-moon { display: none; }

/* ---------- 主内容区 ---------- */
.site-main {
  flex: 1;
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 20px 60px;
}

/* ========================================
   首页 - 文章列表
   ======================================== */
.page-header {
  margin-bottom: 40px;
}

.page-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px;
  cursor: pointer;
  transition: all 0.25s ease;
  box-shadow: var(--shadow-sm);
}

.article-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  flex: 1;
}

.card-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  padding-top: 4px;
}

.card-summary {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 14px;
}

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

.tag {
  display: inline-block;
  padding: 3px 10px;
  background: var(--tag-bg);
  color: var(--tag-text);
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.tag:hover {
  filter: brightness(0.9);
  transform: scale(1.05);
}

/* ========================================
   文章详情页
   ======================================== */
.article-detail {
  animation: fadeIn 0.35s ease;
}

.article-meta {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--divider);
}

.article-meta .article-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.article-info {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.article-info .meta-sep {
  color: var(--text-muted);
}

/* Markdown 渲染样式 */
.markdown-body {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-primary);
}

.markdown-body h1 { font-size: 1.8rem; margin: 2rem 0 1rem; font-weight: 800; }
.markdown-body h2 { font-size: 1.5rem; margin: 1.8rem 0 0.8rem; font-weight: 700;
  padding-bottom: 8px; border-bottom: 1px solid var(--divider); }
.markdown-body h3 { font-size: 1.25rem; margin: 1.5rem 0 0.6rem; font-weight: 600; }
.markdown-body h4 { font-size: 1.1rem; margin: 1.2rem 0 0.5rem; font-weight: 600; }

.markdown-body p { margin-bottom: 1rem; }
.markdown-body strong { font-weight: 700; color: var(--text-primary); }
.markdown-body em { font-style: italic; }
.markdown-body del { color: var(--text-muted); }

.markdown-body a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.markdown-body ul, .markdown-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}
.markdown-body li { margin-bottom: 0.3rem; }

.markdown-body blockquote {
  border-left: 4px solid var(--accent);
  padding: 12px 20px;
  margin: 1.2rem 0;
  background: var(--bg-code);
  border-radius: 0 8px 8px 0;
  color: var(--text-secondary);
}

.markdown-body blockquote p { margin-bottom: 0; }

/* 行内代码 */
.markdown-body code:not(pre code) {
  background: var(--bg-code);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "Fira Code", "Consolas", "Monaco", monospace;
  font-size: 0.88em;
  color: #e06c75;
}

[data-theme="light"] .markdown-body code:not(pre code) {
  color: #c7254e;
}

/* 代码块容器 */
.markdown-body pre {
  margin: 1.2rem 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.markdown-body pre code {
  display: block;
  padding: 20px;
  overflow-x: auto;
  font-family: "Fira Code", "Consolas", "Monaco", monospace;
  font-size: 0.88rem;
  line-height: 1.6;
}

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

.markdown-body th, .markdown-body td {
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  text-align: left;
}

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

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

.markdown-body img {
  border-radius: 8px;
  margin: 1rem 0;
}

/* ========================================
   标签页面
   ======================================== */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.tag-cloud .tag {
  font-size: 0.9rem;
  padding: 6px 16px;
}

.tag-cloud .tag.active-tag {
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: #fff;
}

.all-tags-link {
  display: inline-block;
  margin-bottom: 20px;
  font-size: 0.9rem;
  color: var(--accent);
}

/* ========================================
   关于页面
   ======================================== */
.about-page {
  animation: fadeIn 0.35s ease;
}

/* ========================================
   回首页按钮
   ======================================== */
.back-home {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 24px;
  transition: color 0.2s;
}

.back-home:hover {
  color: var(--accent);
}

.back-home svg {
  width: 16px;
  height: 16px;
}

/* ========================================
   加载与空状态
   ======================================== */
.loading {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  font-size: 1rem;
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}

.empty-state p {
  font-size: 1.1rem;
}

/* ========================================
   页脚
   ======================================== */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 24px 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-inner {
  max-width: 800px;
  margin: 0 auto;
}

.highlight {
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 600;
}

.footer-beian {
  margin-top: 6px;
  font-size: 0.8rem;
}

.footer-beian a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-beian a:hover {
  color: var(--accent);
}

/* ========================================
   动画
   ======================================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ========================================
   响应式适配
   ======================================== */
@media (max-width: 640px) {
  .header-inner { padding: 0 16px; }
  .site-main { padding: 24px 16px 40px; }

  .page-title { font-size: 1.5rem; }
  .article-meta .article-title { font-size: 1.5rem; }
  .card-title { font-size: 1.1rem; }
  .card-header { flex-direction: column; gap: 4px; }

  .markdown-body { font-size: 1rem; }
  .markdown-body pre code { padding: 16px; font-size: 0.82rem; }
}