/* ============ 全局变量与基础 ============ */
:root {
  --primary: #4f6df5;
  --primary-dark: #3b57d9;
  --text: #1f2329;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --bg: #f7f8fa;
  --card-bg: #ffffff;
  --danger: #e5484d;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

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

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

.container { max-width: 860px; margin: 0 auto; padding: 0 20px; }
.muted { color: var(--text-secondary); }
.small { font-size: 13px; }

/* ============ 按钮与表单 ============ */
.btn {
  display: inline-block;
  padding: 8px 18px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.15s;
}
.btn:hover { background: var(--primary-dark); color: #fff; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-outline { background: #fff; border-color: var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: #fff; }
.btn-outline.current { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #c93a3f; }
.btn-sm { padding: 4px 12px; font-size: 13px; }
.btn-block { width: 100%; }

.input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  color: var(--text);
}
.input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 109, 245, 0.12); }
textarea.input { resize: vertical; }

.form-field { margin-bottom: 16px; }
.form-field label { display: block; margin-bottom: 6px; font-size: 14px; color: var(--text-secondary); }
.form-row { display: flex; gap: 12px; }
.form-row > * { flex: 1; }

/* ============ 顶部导航 ============ */
#site-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { font-size: 18px; font-weight: 700; color: var(--text); }
#site-header nav { display: flex; gap: 24px; }
#site-header nav a { color: var(--text-secondary); font-size: 15px; }
#site-header nav a:hover, #site-header nav a.active { color: var(--primary); }

/* ============ 首页 ============ */
.hero { padding: 48px 0 28px; text-align: center; }
.hero h1 { font-size: 32px; margin-bottom: 8px; }
.hero p { color: var(--text-secondary); margin-bottom: 24px; }
.search-form { display: flex; gap: 10px; max-width: 460px; margin: 0 auto; }

.post-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 28px;
  margin-bottom: 20px;
}
.post-card h2 { font-size: 20px; margin-bottom: 6px; }
.post-card h2 a { color: var(--text); }
.post-card h2 a:hover { color: var(--primary); }
.post-card .meta { font-size: 13px; color: var(--text-secondary); margin-bottom: 10px; }
.post-card .summary { font-size: 15px; color: #444; margin-bottom: 12px; }

/* ============ 标签 ============ */
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  display: inline-block;
  background: #eef1fe;
  color: var(--primary);
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 12px;
}
.tag:hover { background: var(--primary); color: #fff; }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 12px; padding: 32px 0; }
.tag-cloud .tag { font-size: 14px; padding: 6px 16px; }

/* ============ 分页 ============ */
.pagination { display: flex; justify-content: center; align-items: center; gap: 8px; margin: 32px 0; flex-wrap: wrap; }
.page-info, .page-ellipsis { font-size: 14px; color: var(--text-secondary); padding: 0 4px; }

/* ============ 文章详情 ============ */
.post-header { padding: 40px 0 8px; }
.post-header h1 { font-size: 30px; line-height: 1.3; margin-bottom: 10px; }
.post-header .meta { font-size: 14px; color: var(--text-secondary); margin-bottom: 12px; }
.post-header .tags { margin-bottom: 8px; }

.article-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 40px;
  margin-bottom: 28px;
}

/* Markdown 正文排版 */
.prose { font-size: 16px; word-wrap: break-word; }
.prose h1, .prose h2, .prose h3, .prose h4 { margin: 24px 0 12px; line-height: 1.4; }
.prose h1 { font-size: 24px; } .prose h2 { font-size: 21px; } .prose h3 { font-size: 18px; }
.prose p { margin: 14px 0; }
.prose ul, .prose ol { padding-left: 26px; margin: 14px 0; }
.prose blockquote {
  border-left: 4px solid var(--border);
  padding: 4px 16px;
  margin: 16px 0;
  color: var(--text-secondary);
  background: #fafbfc;
}
.prose img { max-width: 100%; border-radius: 6px; }
.prose a { text-decoration: underline; }
.prose hr { border: none; border-top: 1px solid var(--border); margin: 24px 0; }
.prose table { border-collapse: collapse; width: 100%; margin: 16px 0; font-size: 14px; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.prose th { background: #f6f7f9; }
.prose code {
  background: #f0f0f3;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.9em;
}
.prose pre, .codehilite {
  background: #f6f8fa;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
  margin: 16px 0;
}
.prose pre code, .codehilite code { background: transparent; padding: 0; font-size: 13px; line-height: 1.6; }

/* codehilite(pygments)代码高亮配色(GitHub 风格) */
.codehilite .k, .codehilite .kd, .codehilite .kn, .codehilite .kr { color: #d73a49; }
.codehilite .s, .codehilite .s1, .codehilite .s2, .codehilite .sb, .codehilite .sd { color: #032f62; }
.codehilite .c, .codehilite .c1, .codehilite .cm, .codehilite .cs { color: #6a737d; font-style: italic; }
.codehilite .nf, .codehilite .fm, .codehilite .na { color: #6f42c1; }
.codehilite .mi, .codehilite .mf, .codehilite .mh { color: #005cc5; }
.codehilite .nb, .codehilite .bp { color: #005cc5; }
.codehilite .nt { color: #22863a; }
.codehilite .o, .codehilite .ow { color: #d73a49; }
.codehilite .nn { color: #6f42c1; }

/* ============ 评论区 ============ */
.comments {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 40px 36px;
  margin-bottom: 40px;
}
.comments h3 { font-size: 18px; margin-bottom: 16px; }
.comment { border-top: 1px solid #f0f1f3; padding: 14px 0; }
.comment:first-of-type { border-top: none; }
.comment .c-meta { font-size: 13px; color: var(--text-secondary); margin-bottom: 4px; }
.comment .c-author { font-weight: 600; color: var(--text); margin-right: 8px; }
.comment .c-content { font-size: 15px; white-space: pre-wrap; }
.comment-form { margin-top: 24px; border-top: 1px solid #f0f1f3; padding-top: 20px; }
.comment-form h4 { font-size: 15px; margin-bottom: 12px; }
.comment-form textarea { margin: 12px 0; }

/* ============ 标签页 / 其他页面标题 ============ */
.page-title { padding: 36px 0 20px; }
.page-title h1 { font-size: 26px; }
.page-title .muted { margin-top: 4px; }

/* ============ 登录页 ============ */
.login-page { display: flex; justify-content: center; padding-top: 12vh; }
.login-card {
  width: 380px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 32px;
}
.login-card h1 { font-size: 22px; text-align: center; margin-bottom: 24px; }
.login-card .btn-block { margin-top: 4px; }
.error-text { color: var(--danger); font-size: 13px; min-height: 20px; margin-bottom: 8px; }
.back-home { display: block; text-align: center; margin-top: 16px; font-size: 13px; }

/* ============ 页脚 ============ */
.site-footer {
  border-top: 1px solid var(--border);
  background: #fff;
  text-align: center;
  color: var(--text-secondary);
  font-size: 13px;
  padding: 24px 0;
  margin-top: 48px;
}
.site-footer .beian { color: var(--text-secondary); }
.site-footer .beian:hover { color: var(--primary); }

/* ============ Toast 提示 ============ */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: #323232;
  color: #fff;
  padding: 10px 22px;
  border-radius: 6px;
  font-size: 14px;
  opacity: 0;
  transition: opacity 0.25s, transform 0.25s;
  z-index: 100;
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast-error { background: var(--danger); }
.toast-success { background: #22a06b; }

@media (max-width: 640px) {
  .article-card, .comments { padding: 24px 20px; }
  .hero h1 { font-size: 26px; }
  .form-row { flex-direction: column; gap: 0; }
}