/* ============ 基础样式 · 极简风 ============ */
:root {
  --bg: #ffffff;
  --text: #1f2328;
  --muted: #6e7681;
  --border: #e5e7eb;
  --primary: #0969da;
  --primary-hover: #0550ae;
  --accent: #cf222e;
  --code-bg: #f6f8fa;
  --shadow: 0 1px 3px rgba(0,0,0,.04);
  --max-width: 780px;
  --wide-width: 1080px;
}

[data-theme="dark"] {
  --bg: #0d1117;
  --text: #e6edf3;
  --muted: #8b949e;
  --border: #30363d;
  --primary: #58a6ff;
  --primary-hover: #79b8ff;
  --accent: #ff7b72;
  --code-bg: #161b22;
  --shadow: 0 1px 3px rgba(0,0,0,.4);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC",
              "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background .2s, color .2s;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color .15s;
}
a:hover { color: var(--primary-hover); text-decoration: underline; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}
.wide { max-width: var(--wide-width); }

.muted { color: var(--muted); }

/* ============ 顶部导航 ============ */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(6px);
}
.nav {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 56px;
}
.brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}
.brand:hover { text-decoration: none; color: var(--primary); }
.menu {
  display: flex;
  gap: 16px;
  flex: 1;
}
.menu a {
  color: var(--text);
  font-size: 14px;
}
.actions {
  display: flex;
  gap: 8px;
  align-items: center;
}
#search-input {
  width: 180px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 13px;
}
#search-input:focus { outline: none; border-color: var(--primary); }
#theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text);
}
#theme-toggle:hover { background: var(--code-bg); }

/* ============ 首页 Hero ============ */
.hero {
  padding: 48px 0 24px;
  text-align: center;
}
.hero h1 {
  font-size: 32px;
  margin: 0 0 8px 0;
  font-weight: 700;
}

/* ============ 文章列表 ============ */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 0 32px;
}
.post-card {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
.post-card:last-child { border-bottom: none; }
.post-card h2 {
  margin: 0 0 6px 0;
  font-size: 20px;
  line-height: 1.4;
}
.post-card h2 a { color: var(--text); }
.post-card h2 a:hover { color: var(--primary); text-decoration: none; }
.post-meta {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 8px;
}
.post-meta > * + * { margin-left: 10px; }
.post-summary {
  color: var(--muted);
  font-size: 15px;
  margin: 0;
}
.post-cover {
  width: 100%;
  max-height: 240px;
  object-fit: cover;
  border-radius: 8px;
  margin: 12px 0;
}
.tag {
  display: inline-block;
  font-size: 12px;
  padding: 2px 8px;
  background: var(--code-bg);
  color: var(--muted);
  border-radius: 10px;
  margin-right: 4px;
}
.tag:hover { color: var(--primary); text-decoration: none; }

/* ============ 分页 ============ */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  padding: 24px 0 48px;
}
.pagination button {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}
.pagination button:hover:not([disabled]) { background: var(--code-bg); }
.pagination button[disabled] { opacity: .4; cursor: not-allowed; }
#page-info { color: var(--muted); font-size: 14px; }

/* ============ 文章详情 ============ */
.post-header {
  padding: 40px 0 16px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}
.post-header h1 {
  font-size: 32px;
  margin: 0 0 12px 0;
  line-height: 1.3;
}
.post-content {
  font-size: 16px;
  line-height: 1.8;
}
.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
  margin-top: 1.6em;
  margin-bottom: .6em;
  line-height: 1.3;
}
.post-content h1 { font-size: 28px; border-bottom: 1px solid var(--border); padding-bottom: .3em; }
.post-content h2 { font-size: 24px; border-bottom: 1px solid var(--border); padding-bottom: .3em; }
.post-content h3 { font-size: 20px; }
.post-content p { margin: 1em 0; }
.post-content img {
  max-width: 100%;
  border-radius: 6px;
  display: block;
  margin: 16px auto;
}
.post-content pre {
  background: var(--code-bg);
  padding: 16px;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.5;
}
.post-content code {
  font-family: "JetBrains Mono", "Fira Code", Menlo, Monaco, Consolas, monospace;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
}
.post-content pre code {
  background: transparent;
  padding: 0;
  font-size: 14px;
}
.post-content blockquote {
  border-left: 4px solid var(--border);
  margin: 1em 0;
  padding: .4em 1em;
  color: var(--muted);
  background: var(--code-bg);
  border-radius: 0 4px 4px 0;
}
.post-content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0;
}
.post-content th,
.post-content td {
  border: 1px solid var(--border);
  padding: 6px 12px;
}
.post-content th { background: var(--code-bg); }
.post-content ul, .post-content ol { padding-left: 1.8em; }
.post-content hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }

/* 上下篇导航 */
.neighbors {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 0;
  border-top: 1px solid var(--border);
  margin-top: 32px;
}
.neighbor { flex: 1; padding: 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; }
.neighbor .label { color: var(--muted); font-size: 12px; }

/* 评论 */
.comments {
  margin-top: 40px;
  border-top: 1px solid var(--border);
  padding-top: 24px;
}
.comments h3 { margin-top: 0; }
.comment {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.comment .meta {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 4px;
}
.comment .nick { font-weight: 600; color: var(--text); }
.comment-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 16px 0;
}
.comment-form input,
.comment-form textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
}
.comment-form .row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}
.comment-form textarea { min-height: 100px; resize: vertical; }
.btn {
  display: inline-block;
  padding: 8px 16px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
}
.btn:hover { background: var(--primary-hover); }
.btn.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn.ghost:hover { background: var(--code-bg); }

/* ============ 归档 / 分类 / 标签页 ============ */
.archive-list h3 {
  margin-top: 24px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
}
.archive-item {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
}
.archive-item .date { color: var(--muted); font-size: 13px; }

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 24px 0;
}
.tag-cloud a {
  padding: 4px 12px;
  background: var(--code-bg);
  border-radius: 16px;
  color: var(--text);
  font-size: 14px;
}

/* ============ 页脚 ============ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--muted);
  text-align: center;
  font-size: 14px;
  margin-top: 48px;
}

/* ============ 响应式 ============ */
@media (max-width: 720px) {
  .menu { gap: 10px; font-size: 13px; }
  #search-input { width: 110px; }
  .hero h1 { font-size: 24px; }
  .post-header h1 { font-size: 24px; }
  .comment-form .row { grid-template-columns: 1fr; }
}

/* ============ 后台管理 ============ */
.admin-body { background: var(--code-bg); }
.admin-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 100vh;
}
.admin-sidebar {
  background: var(--bg);
  border-right: 1px solid var(--border);
  padding: 24px 16px;
}
.admin-sidebar h2 { margin-top: 0; font-size: 18px; }
.admin-sidebar nav { display: flex; flex-direction: column; gap: 4px; margin-top: 16px; }
.admin-sidebar nav a {
  padding: 8px 12px;
  border-radius: 6px;
  color: var(--text);
}
.admin-sidebar nav a:hover,
.admin-sidebar nav a.active { background: var(--code-bg); text-decoration: none; }
.admin-main { padding: 24px; }
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 16px;
}
.admin-table {
  width: 100%;
  border-collapse: collapse;
}
.admin-table th, .admin-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-size: 14px;
}
.admin-table th { background: var(--code-bg); }
.admin-table .actions-col { text-align: right; white-space: nowrap; }
.admin-table button { margin-left: 6px; }

.form-grid {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 12px 16px;
  align-items: start;
}
.form-grid label { font-size: 14px; color: var(--muted); padding-top: 8px; }
.form-grid input,
.form-grid select,
.form-grid textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
}
.form-grid textarea { min-height: 400px; resize: vertical; font-family: "JetBrains Mono", monospace; font-size: 13px; }

.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--code-bg);
}
.login-box {
  background: var(--bg);
  padding: 32px;
  border-radius: 10px;
  box-shadow: var(--shadow);
  width: 320px;
}
.login-box h1 { margin: 0 0 20px 0; font-size: 22px; text-align: center; }

/* 提示框 */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
  z-index: 999;
}
.toast.show { opacity: .9; }