/* ============================================================
   个人技术博客 - 自定义样式
   基础配色: 石板灰 + 靛蓝强调色; 亮 / 暗双主题
   ============================================================ */

/* ---------- 基础 ---------- */
html { scroll-behavior: smooth; }
body { font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif; }
pre, code, .font-mono { font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

/* 选中文字 */
::selection { background: #6366f1; color: #fff; }
.dark ::selection { background: #818cf8; color: #0f172a; }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 8px; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }
::-webkit-scrollbar-track { background: transparent; }
.dark ::-webkit-scrollbar-thumb { background: #334155; }
.dark ::-webkit-scrollbar-thumb:hover { background: #475569; }

/* 用户关闭动效时保持克制 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ---------- 导航链接 ---------- */
.nav-link {
  display: inline-block; padding: .5rem .8rem; border-radius: .5rem;
  font-size: .9rem; font-weight: 500; color: #64748b; white-space: nowrap;
  transition: color .2s ease, background-color .2s ease;
}
.nav-link:hover { color: #0f172a; background: #f1f5f9; }
.dark .nav-link { color: #94a3b8; }
.dark .nav-link:hover { color: #e2e8f0; background: #1e293b; }
.nav-link-active { color: #4f46e5 !important; background: #eef2ff !important; }
.dark .nav-link-active { color: #a5b4fc !important; background: #312e81 !important; }

.footer-link { color: #64748b; transition: color .2s ease; }
.footer-link:hover { color: #4f46e5; }
.dark .footer-link { color: #94a3b8; }
.dark .footer-link:hover { color: #a5b4fc; }

/* ---------- 输入控件 ---------- */
.input {
  background: #fff; border: 1px solid #e2e8f0; border-radius: .5rem;
  color: #0f172a; outline: none;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.input::placeholder { color: #94a3b8; }
.input:focus { border-color: #6366f1; box-shadow: 0 0 0 3px rgba(99, 102, 241, .15); }
.dark .input { background: #0f172a; border-color: #334155; color: #e2e8f0; }
.dark .input::placeholder { color: #64748b; }
.dark .input:focus { border-color: #818cf8; box-shadow: 0 0 0 3px rgba(129, 140, 248, .2); }
textarea.input, select.input { border-radius: .6rem; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  padding: .55rem 1.1rem; border-radius: .6rem;
  font-size: .875rem; font-weight: 600; cursor: pointer;
  border: 1px solid transparent; line-height: 1.2;
  transition: all .2s ease;
}
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: #6366f1; color: #fff; box-shadow: 0 4px 14px rgba(99, 102, 241, .25); }
.btn-primary:hover { background: #4f46e5; transform: translateY(-1px); }
.dark .btn-primary { background: #818cf8; color: #1e1b4b; }
.dark .btn-primary:hover { background: #a5b4fc; }
.btn-secondary { background: #f1f5f9; color: #334155; border-color: #e2e8f0; }
.btn-secondary:hover { background: #e2e8f0; }
.dark .btn-secondary { background: #1e293b; color: #e2e8f0; border-color: #334155; }
.dark .btn-secondary:hover { background: #334155; }
.btn-danger { background: #fee2e2; color: #b91c1c; border-color: #fecaca; }
.btn-danger:hover { background: #fecaca; }
.dark .btn-danger { background: #7f1d1d; color: #fecaca; border-color: #991b1b; }
.dark .btn-danger:hover { background: #991b1b; }

/* ---------- 卡片 ---------- */
.card {
  background: #fff; border: 1px solid #e2e8f0; border-radius: 1rem;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 14px 30px -12px rgba(15, 23, 42, .16); border-color: #c7d2fe; }
.dark .card { background: #0f172a; border-color: #1e293b; }
.dark .card:hover { box-shadow: 0 14px 30px -12px rgba(0, 0, 0, .55); border-color: #4338ca; }

/* 文章卡入场动画 */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.card.post-card { animation: fade-up .5s ease both; }

/* ---------- 分页 ---------- */
.pagination-btn {
  display: inline-flex; min-width: 2.4rem; height: 2.4rem; align-items: center; justify-content: center;
  padding: 0 .8rem; border-radius: .55rem; font-size: .875rem; font-weight: 500;
  color: #64748b; background: #fff; border: 1px solid #e2e8f0;
  transition: all .2s ease;
}
.pagination-btn:hover { color: #4f46e5; border-color: #c7d2fe; background: #eef2ff; }
.pagination-active { color: #fff !important; background: #6366f1 !important; border-color: #6366f1 !important; }
.dark .pagination-btn { background: #0f172a; border-color: #334155; color: #94a3b8; }
.dark .pagination-btn:hover { color: #a5b4fc; background: #1e293b; border-color: #4338ca; }
.dark .pagination-active { color: #1e1b4b !important; background: #818cf8 !important; border-color: #818cf8 !important; }

/* ---------- 标签 / 徽章 ---------- */
.tag-chip {
  display: inline-flex; align-items: center; padding: .3rem .85rem; border-radius: 999px;
  font-size: .78rem; font-weight: 500; color: #475569; background: #f1f5f9;
  transition: all .2s ease; border: 1px solid transparent;
}
.tag-chip:hover { color: #4f46e5; background: #eef2ff; }
.dark .tag-chip { color: #94a3b8; background: #1e293b; }
.dark .tag-chip:hover { color: #a5b4fc; background: #312e81; }
.tag-chip-active { color: #fff !important; background: #6366f1 !important; }
.dark .tag-chip-active { color: #1e1b4b !important; background: #818cf8 !important; }

.badge {
  display: inline-flex; align-items: center; padding: .18rem .65rem; border-radius: 999px;
  font-size: .75rem; font-weight: 600; color: #4f46e5; background: #eef2ff;
}
.dark .badge { color: #a5b4fc; background: #312e81; }
.badge-green { color: #059669; background: #ecfdf5; }
.dark .badge-green { color: #6ee7b7; background: #064e3b; }
.badge-yellow { color: #d97706; background: #fffbeb; }
.dark .badge-yellow { color: #fcd34d; background: #78350f; }

/* 搜索关键词高亮 */
mark { background: #fef08a; color: #713f12; padding: 0 .15em; border-radius: .2em; font-weight: 600; }
.dark mark { background: #854d0e; color: #fef9c3; }

/* ---------- 返回顶部 ---------- */
#back-top {
  position: fixed; right: 1.25rem; bottom: 1.25rem; z-index: 50;
  display: flex; align-items: center; justify-content: center;
  width: 2.8rem; height: 2.8rem; border-radius: 999px;
  background: #6366f1; color: #fff; border: none; cursor: pointer;
  box-shadow: 0 8px 20px rgba(99, 102, 241, .35);
  opacity: 0; pointer-events: none; transform: translateY(10px);
  transition: opacity .25s ease, transform .25s ease, background .2s ease;
}
#back-top.revealed { opacity: 1; pointer-events: auto; transform: none; }
#back-top:hover { background: #4f46e5; }
.dark #back-top { background: #818cf8; color: #1e1b4b; }

/* ---------- 后台组件 ---------- */
.admin-tab {
  display: inline-flex; align-items: center; padding: .45rem 1rem; border-radius: .55rem;
  font-size: .85rem; font-weight: 500; color: #64748b; background: #fff;
  border: 1px solid #e2e8f0; transition: all .2s ease;
}
.admin-tab:hover { color: #4f46e5; border-color: #c7d2fe; }
.admin-tab-active { color: #fff !important; background: #6366f1 !important; border-color: #6366f1 !important; }
.dark .admin-tab { background: #0f172a; border-color: #334155; color: #94a3b8; }
.dark .admin-tab:hover { color: #a5b4fc; border-color: #4338ca; }
.dark .admin-tab-active { color: #1e1b4b !important; background: #818cf8 !important; border-color: #818cf8 !important; }

.alert {
  padding: .8rem 1rem; border-radius: .6rem; font-size: .875rem; font-weight: 500;
  border: 1px solid transparent;
}
.alert-success { color: #047857; background: #ecfdf5; border-color: #a7f3d0; }
.dark .alert-success { color: #a7f3d0; background: #064e3b; border-color: #065f46; }
.alert-error   { color: #b91c1c; background: #fef2f2; border-color: #fecaca; }
.dark .alert-error { color: #fecaca; background: #7f1d1d; border-color: #991b1b; }

/* 后台数据表格 */
.data-table { width: 100%; border-collapse: collapse; font-size: .875rem; }
.data-table th {
  text-align: left; padding: .7rem .9rem; font-weight: 600;
  color: #475569; background: #f8fafc; border-bottom: 1px solid #e2e8f0; white-space: nowrap;
}
.data-table td { padding: .7rem .9rem; border-bottom: 1px solid #f1f5f9; vertical-align: middle; }
.data-table tbody tr { transition: background .15s ease; }
.data-table tbody tr:hover { background: #f8fafc; }
.dark .data-table th { color: #cbd5e1; background: #0f172a; border-bottom-color: #1e293b; }
.dark .data-table td { border-bottom-color: #1e293b; }
.dark .data-table tbody tr:hover { background: #111c33; }

/* ---------- Markdown 正文排版 ---------- */
.markdown-body { line-height: 1.85; font-size: 1.02rem; color: #334155; word-break: break-word; }
.dark .markdown-body { color: #cbd5e1; }

.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
  color: #0f172a; font-weight: 700; line-height: 1.35; margin: 1.8em 0 .7em;
}
.dark .markdown-body h1, .dark .markdown-body h2, .dark .markdown-body h3, .dark .markdown-body h4 { color: #f1f5f9; }
.markdown-body h1 { font-size: 1.6rem; padding-bottom: .45em; border-bottom: 1px solid #e2e8f0; }
.markdown-body h2 { font-size: 1.35rem; padding-bottom: .35em; border-bottom: 1px solid #eef2f7; }
.markdown-body h3 { font-size: 1.15rem; }
.markdown-body h4 { font-size: 1.02rem; }
.dark .markdown-body h1 { border-bottom-color: #1e293b; }
.dark .markdown-body h2 { border-bottom-color: #1e293b; }

.markdown-body p { margin: .9em 0; }
.markdown-body a { color: #4f46e5; text-decoration: underline; text-underline-offset: 3px; }
.markdown-body a:hover { color: #4338ca; }
.dark .markdown-body a { color: #a5b4fc; }
.dark .markdown-body a:hover { color: #c7d2fe; }

.markdown-body ul, .markdown-body ol { margin: 1em 0; padding-left: 1.7em; }
.markdown-body li { margin: .35em 0; }
.markdown-body li::marker { color: #818cf8; }

.markdown-body blockquote {
  margin: 1.3em 0; padding: .7em 1.1em; border-left: 4px solid #6366f1;
  background: #f8fafc; border-radius: 0 .6rem .6rem 0; color: #64748b;
}
.dark .markdown-body blockquote { background: #111c33; color: #94a3b8; }

.markdown-body code {
  font-size: .88em; padding: .18em .45em; border-radius: .35em;
  background: #f1f5f9; color: #be185d; overflow-wrap: break-word;
}
.dark .markdown-body code { background: #1e293b; color: #f472b6; }

.markdown-body pre {
  margin: 1.4em 0; padding: 1em 1.2em; overflow-x: auto;
  border-radius: .8rem; background: #0f172a; color: #e2e8f0;
  font-size: .88rem; line-height: 1.7; border: 1px solid #1e293b;
}
.markdown-body pre code { background: transparent; padding: 0; color: inherit; font-size: inherit; border-radius: 0; }
.dark .markdown-body pre { background: #020617; }

.markdown-body img { max-width: 100%; height: auto; border-radius: .75rem; margin: 1.3em 0; }
.markdown-body table { width: 100%; border-collapse: collapse; margin: 1.4em 0; font-size: .92rem; display: block; overflow-x: auto; }
.markdown-body th, .markdown-body td { border: 1px solid #e2e8f0; padding: .55em .9em; text-align: left; }
.markdown-body th { background: #f8fafc; font-weight: 600; color: #0f172a; }
.markdown-body tr:nth-child(even) td { background: #fafbfc; }
.dark .markdown-body th, .dark .markdown-body td { border-color: #1e293b; }
.dark .markdown-body th { background: #0f172a; color: #f1f5f9; }
.dark .markdown-body tr:nth-child(even) td { background: #0d1526; }

.markdown-body hr { border: none; border-top: 1px solid #e2e8f0; margin: 2em 0; }
.dark .markdown-body hr { border-top-color: #1e293b; }
.markdown-body strong { color: #0f172a; }
.dark .markdown-body strong { color: #f8fafc; }

/* ---------- 代码高亮配色 (自定义, 亮 / 暗两套) ---------- */
.markdown-body .hljs-comment,
.markdown-body .hljs-quote { color: #94a3b8; font-style: italic; }

.markdown-body .hljs-keyword,
.markdown-body .hljs-selector-tag,
.markdown-body .hljs-literal,
.markdown-body .hljs-doctag { color: #7c3aed; }

.markdown-body .hljs-string,
.markdown-body .hljs-regexp,
.markdown-body .hljs-addition { color: #059669; }

.markdown-body .hljs-number,
.markdown-body .hljs-symbol,
.markdown-body .hljs-bullet,
.markdown-body .hljs-link { color: #d97706; }

.markdown-body .hljs-title,
.markdown-body .hljs-section { color: #2563eb; font-weight: 600; }
.markdown-body .hljs-title.function_ { color: #db2777; }

.markdown-body .hljs-attr,
.markdown-body .hljs-attribute,
.markdown-body .hljs-variable,
.markdown-body .hljs-template-variable,
.markdown-body .hljs-selector-attr,
.markdown-body .hljs-selector-class { color: #db2777; }

.markdown-body .hljs-type,
.markdown-body .hljs-built_in,
.markdown-body .hljs-builtin-name,
.markdown-body .hljs-meta { color: #0891b2; }

.markdown-body .hljs-deletion { color: #dc2626; }
.markdown-body .hljs-emphasis { font-style: italic; }
.markdown-body .hljs-strong { font-weight: 700; }

.dark .markdown-body .hljs-keyword,
.dark .markdown-body .hljs-selector-tag,
.dark .markdown-body .hljs-literal,
.dark .markdown-body .hljs-doctag { color: #c4b5fd; }
.dark .markdown-body .hljs-string,
.dark .markdown-body .hljs-regexp,
.dark .markdown-body .hljs-addition { color: #6ee7b7; }
.dark .markdown-body .hljs-number,
.dark .markdown-body .hljs-symbol,
.dark .markdown-body .hljs-bullet,
.dark .markdown-body .hljs-link { color: #fbbf24; }
.dark .markdown-body .hljs-title,
.dark .markdown-body .hljs-section { color: #93c5fd; }
.dark .markdown-body .hljs-title.function_ { color: #f9a8d4; }
.dark .markdown-body .hljs-attr,
.dark .markdown-body .hljs-attribute,
.dark .markdown-body .hljs-variable,
.dark .markdown-body .hljs-template-variable,
.dark .markdown-body .hljs-selector-attr,
.dark .markdown-body .hljs-selector-class { color: #f9a8d4; }
.dark .markdown-body .hljs-type,
.dark .markdown-body .hljs-built_in,
.dark .markdown-body .hljs-builtin-name,
.dark .markdown-body .hljs-meta { color: #67e8f9; }