:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #1a1a1a;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #dc2626;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }

.container { max-width: 860px; margin: 0 auto; padding: 0 20px; }
.container.narrow { max-width: 640px; }

/* 顶栏 */
.site-header { background: var(--surface); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font-weight: 700; font-size: 18px; color: var(--text); }
.brand:hover { color: var(--text); }
.nav { display: flex; align-items: center; gap: 18px; }
.nav a { color: var(--text-muted); font-size: 14px; }
.nav a:hover { color: var(--text); }
.admin-header { background: #0f172a; border-bottom: none; }
.admin-header .brand, .admin-header .nav a { color: #cbd5e1; }
.admin-header .nav a:hover, .admin-header .brand:hover { color: #fff; }

main.container { padding: 40px 20px 80px; }

/* 首页 hero */
.hero { margin-bottom: 24px; }
.hero h1 { font-size: 28px; margin: 0 0 8px; }
.hero-desc { color: var(--text-muted); margin: 0; }

/* 分类筛选 */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.chip {
  padding: 6px 14px; border: 1px solid var(--border); border-radius: 999px;
  font-size: 13px; color: var(--text-muted); background: var(--surface);
}
.chip:hover { color: var(--text); border-color: #cbd5e1; }
.chip.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.chip.active:hover { color: #fff; }

/* 文章列表 */
.post-list { display: flex; flex-direction: column; gap: 16px; }
.post-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 22px; box-shadow: var(--shadow);
}
.post-title { font-size: 19px; font-weight: 600; color: var(--text); }
.post-title:hover { color: var(--primary); }
.post-meta { display: flex; align-items: center; gap: 10px; margin: 6px 0 8px; font-size: 13px; color: var(--text-muted); }
.tag { background: #eff6ff; color: var(--primary); padding: 2px 10px; border-radius: 999px; font-size: 12px; }
.post-excerpt { margin: 0; color: var(--text-muted); font-size: 14px; }
.empty { color: var(--text-muted); }

/* 文章详情 */
.post-h1 { font-size: 30px; margin: 0 0 12px; }
.post-body { font-size: 16px; margin: 20px 0; }
.back { font-size: 14px; }

/* 卡片与表单 */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow);
}
.center-box { padding-top: 80px; display: flex; justify-content: center; }
.center-box .card, .center-box > * { width: 100%; max-width: 420px; }
.gate-card h1, .card h1 { font-size: 24px; margin: 0 0 8px; text-align: center; }
.muted { color: var(--text-muted); }
.muted.small { font-size: 13px; margin-top: 16px; text-align: center; }
.small { font-size: 13px; }

.form { display: flex; flex-direction: column; gap: 6px; }
.form label { font-size: 13px; color: var(--text-muted); margin-top: 12px; }
.form label.check { display: flex; align-items: center; gap: 8px; margin-top: 12px; color: var(--text); cursor: pointer; }
.form input[type="text"], .form input[type="email"], .form input[type="password"],
.form select, .form textarea {
  font-size: 15px; padding: 10px 12px; border: 1px solid var(--border);
  border-radius: 8px; background: #fff; font-family: inherit; width: 100%;
}
.form input:focus, .form select:focus, .form textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
.form textarea { resize: vertical; }
.form input[disabled] { background: #f3f4f6; color: var(--text-muted); }

.btn {
  display: inline-block; padding: 9px 18px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  font-size: 14px; cursor: pointer; font-family: inherit;
}
.btn:hover { background: #f3f4f6; color: var(--text); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-hover); color: #fff; }
.btn.small { padding: 5px 12px; font-size: 13px; }
.btn.danger { color: var(--danger); border-color: #fecaca; }
.btn.danger:hover { background: #fef2f2; color: var(--danger); }
.btn.block { width: 100%; margin-top: 8px; }
.link-btn { background: none; border: none; color: inherit; cursor: pointer; font-size: 14px; padding: 0; font-family: inherit; }
.danger-text { color: var(--danger); }
.danger-text:hover { color: var(--danger); }

.inline { display: inline; }
.form-actions { display: flex; gap: 12px; margin-top: 20px; }
.error { color: var(--danger); font-size: 13px; margin: 8px 0 0; }
.success { color: #16a34a; font-size: 14px; background: #f0fdf4; border: 1px solid #bbf7d0; border-radius: 8px; padding: 10px 14px; }

/* 控制台 */
.dash-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.dash-head h1 { font-size: 24px; margin: 0; }
.dash-grid { display: grid; grid-template-columns: 1fr 280px; gap: 24px; align-items: start; }
@media (max-width: 720px) { .dash-grid { grid-template-columns: 1fr; } }

.table {
  width: 100%; border-collapse: collapse; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
}
.table th, .table td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--border); font-size: 14px; }
.table th { background: #f9fafb; color: var(--text-muted); font-weight: 500; font-size: 13px; }
.table tr:last-child td { border-bottom: none; }
.actions { white-space: nowrap; }
.actions .btn, .actions form { margin-right: 6px; }

.col-side h2 { font-size: 16px; margin: 0 0 12px; }
.inline-form { display: flex; gap: 8px; margin-bottom: 12px; }
.inline-form input { flex: 1; }
.cat-list { list-style: none; padding: 0; margin: 0; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.cat-list li { display: flex; align-items: center; justify-content: space-between; padding: 10px 16px; border-bottom: 1px solid var(--border); font-size: 14px; }
.cat-list li:last-child { border-bottom: none; }

.form h2 { font-size: 16px; margin: 24px 0 0; padding-top: 16px; border-top: 1px solid var(--border); }
.form h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }

/* 搜索 */
.search { display: flex; gap: 8px; margin-top: 14px; max-width: 420px; }
.search input {
  flex: 1; font-size: 14px; padding: 9px 12px; border: 1px solid var(--border);
  border-radius: 8px; background: #fff; font-family: inherit;
}
.search input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12); }
.search-info { color: var(--text-muted); font-size: 13px; margin: 0 0 16px; }

/* 编辑器 */
.editor-bar { display: flex; align-items: center; justify-content: space-between; margin-top: 12px; }
.editor-bar label { margin-top: 0; }
.editor-actions { display: flex; align-items: center; gap: 8px; }
.preview {
  margin-top: 12px; padding: 16px; border: 1px dashed var(--border);
  border-radius: 8px; background: #fff;
}

/* 图床 */
.img-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; margin-top: 16px; }
.img-cell { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.img-cell img { width: 100%; height: 140px; object-fit: cover; display: block; background: #f3f4f6; }
.img-cell-actions { padding: 10px; display: flex; align-items: center; gap: 6px; }
.img-cell-actions input {
  flex: 1; min-width: 0; font-size: 12px; padding: 6px 8px; border: 1px solid var(--border); border-radius: 6px; background: #f9fafb;
}

/* Markdown 正文样式（文章详情与预览共用） */
.post-body h1, .post-body h2, .post-body h3, .post-body h4, .post-body h5, .post-body h6,
.preview h1, .preview h2, .preview h3, .preview h4, .preview h5, .preview h6 {
  line-height: 1.4; margin: 1.2em 0 0.5em;
}
.post-body h1, .preview h1 { font-size: 1.7em; }
.post-body h2, .preview h2 { font-size: 1.4em; }
.post-body h3, .preview h3 { font-size: 1.2em; }
.post-body p, .preview p { margin: 0.7em 0; }
.post-body img, .preview img { max-width: 100%; border-radius: 8px; }
.post-body a, .preview a { word-break: break-all; }
.post-body pre, .preview pre { background: #f3f4f6; padding: 14px; border-radius: 8px; overflow-x: auto; }
.post-body code, .preview code { background: #f3f4f6; padding: 2px 6px; border-radius: 4px; font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace; font-size: 0.9em; }
.post-body pre code, .preview pre code { background: none; padding: 0; }
.post-body blockquote, .preview blockquote { border-left: 3px solid var(--border); margin: 12px 0; padding-left: 16px; color: var(--text-muted); }
.post-body ul, .post-body ol, .preview ul, .preview ol { padding-left: 24px; margin: 0.7em 0; }
.post-body table, .preview table { border-collapse: collapse; width: 100%; margin: 1em 0; }
.post-body th, .post-body td, .preview th, .preview td { border: 1px solid var(--border); padding: 8px 12px; }
.post-body hr, .preview hr { border: none; border-top: 1px solid var(--border); margin: 1.5em 0; }