/* ===== 在线工具箱 - 全站样式 ===== */
:root {
  --bg: #f5f6fa;
  --card: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --brand: #4f46e5;
  --brand-hover: #4338ca;
  --brand-soft: #eef2ff;
  --border: #e5e7eb;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .08);
  --shadow-lg: 0 8px 24px rgba(16, 24, 40, .10);
  --ok: #16a34a;
  --err: #dc2626;
}
[data-theme="dark"] {
  --bg: #0e1116;
  --card: #171b24;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --brand: #818cf8;
  --brand-hover: #a5b4fc;
  --brand-soft: #1e2333;
  --border: #2a3040;
  --shadow: none;
  --shadow-lg: none;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  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;
  font-size: 15px;
}
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-hover); }
.container { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.container.narrow { max-width: 800px; }
.muted { color: var(--muted); }
.mono { font-family: ui-monospace, Consolas, "Courier New", monospace; }

/* ===== 头部 ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; gap: 20px; height: 56px; }
.logo { font-size: 18px; font-weight: 700; color: var(--text); display: flex; align-items: center; gap: 6px; }
.logo:hover { color: var(--brand); }
.nav { display: flex; gap: 18px; flex: 1; }
.nav a { color: var(--muted); font-size: 14px; }
.nav a:hover { color: var(--brand); }
.theme-btn { background: none; border: 1px solid var(--border); border-radius: 8px; padding: 4px 10px; cursor: pointer; font-size: 15px; }

.site-main { min-height: calc(100vh - 220px); padding-bottom: 40px; }

/* ===== 首页 Hero ===== */
.hero { padding: 56px 0 36px; text-align: center; background: linear-gradient(180deg, var(--brand-soft), var(--bg)); }
.hero h1 { font-size: 32px; margin-bottom: 12px; }
.hero-sub { color: var(--muted); max-width: 640px; margin: 0 auto 24px; }
.hero-search { max-width: 560px; margin: 0 auto 20px; }
.hero-search input {
  width: 100%; padding: 13px 18px; font-size: 15px;
  border: 1px solid var(--border); border-radius: 999px;
  background: var(--card); color: var(--text);
  box-shadow: var(--shadow); outline: none;
}
.hero-search input:focus { border-color: var(--brand); }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.chip {
  padding: 5px 14px; border-radius: 999px; font-size: 13px;
  background: var(--card); border: 1px solid var(--border); color: var(--muted);
}
.chip:hover { border-color: var(--brand); color: var(--brand); }

/* ===== 工具卡片网格 ===== */
.tool-section { margin-top: 36px; }
.section-title { font-size: 20px; margin-bottom: 14px; display: flex; align-items: baseline; gap: 10px; }
.section-title a { color: var(--text); }
.section-title a:hover { color: var(--brand); }
.section-title .count { font-size: 12px; color: var(--muted); font-weight: 400; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.tool-card { padding: 16px; display: flex; flex-direction: column; gap: 6px; color: var(--text); }
.tool-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--brand); color: var(--text); }
.tool-name { font-weight: 600; font-size: 15px; color: var(--brand); }
.tool-desc { font-size: 13px; line-height: 1.55; }

/* ===== 面包屑 / 标题 ===== */
.crumbs { padding: 18px 0 6px; font-size: 13px; color: var(--muted); display: flex; gap: 8px; flex-wrap: wrap; }
.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--brand); }
.tool-h1 { font-size: 26px; margin: 10px 0 14px; line-height: 1.35; }
.tool-intro { color: var(--muted); font-size: 14.5px; margin-bottom: 20px; }
.tool-intro p { margin-bottom: 8px; }

/* ===== 工具主体 ===== */
.tool-body { padding: 22px; margin-bottom: 26px; }
.tool-form .field { margin-bottom: 14px; }
.tool-form label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
.io {
  width: 100%; padding: 10px 12px; font-size: 14px;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg); color: var(--text);
  outline: none; resize: vertical;
  transition: border-color .15s;
}
.io:focus { border-color: var(--brand); }
textarea.io { min-height: 80px; line-height: 1.6; }
.row { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; margin-bottom: 14px; }
.row .field { margin-bottom: 0; flex: 1; min-width: 140px; }
.row .field.grow { flex: 3; }
.row.btns { margin-bottom: 16px; }
.row.opts { align-items: center; margin-bottom: 14px; }
.opt { display: inline-flex; align-items: center; gap: 6px; font-size: 13.5px; color: var(--text); cursor: pointer; margin-right: 12px; white-space: nowrap; }
.opt input { accent-color: var(--brand); }
.btn {
  display: inline-block; padding: 9px 18px; font-size: 14px;
  border-radius: 8px; border: 1px solid var(--border);
  background: var(--card); color: var(--text); cursor: pointer;
  transition: all .15s; font-family: inherit;
}
.btn:hover { border-color: var(--brand); color: var(--brand); }
.btn-primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-hover); border-color: var(--brand-hover); color: #fff; }
.btn-ghost { background: transparent; }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.stat { font-size: 13px; margin-top: -6px; margin-bottom: 12px; }

.notice { padding: 10px 14px; border-radius: 8px; font-size: 13.5px; margin-bottom: 12px; }
.notice.error { background: rgba(220, 38, 38, .1); color: var(--err); border: 1px solid rgba(220, 38, 38, .25); }
.notice.success { background: rgba(22, 163, 74, .1); color: var(--ok); border: 1px solid rgba(22, 163, 74, .25); }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; margin-top: 6px; }
.stat-grid .stat-item { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 14px; text-align: center; }
.stat-grid .stat-num { font-size: 22px; font-weight: 700; color: var(--brand); display: block; }
.stat-grid .stat-label { font-size: 12px; color: var(--muted); }

.card-lite { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 16px; font-size: 15px; }

.diff-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.diff-result { border: 1px solid var(--border); border-radius: 8px; font-family: ui-monospace, Consolas, monospace; font-size: 13px; max-height: 480px; overflow: auto; }
.diff-line { padding: 2px 10px; white-space: pre-wrap; word-break: break-all; }
.diff-del { background: rgba(220, 38, 38, .12); color: var(--err); }
.diff-add { background: rgba(22, 163, 74, .12); color: var(--ok); }
.diff-same { color: var(--muted); }

.regex-result { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 12px; min-height: 60px; white-space: pre-wrap; word-break: break-all; font-size: 13.5px; }
.regex-result mark { background: #fde047; color: #1f2430; border-radius: 3px; padding: 0 2px; }
.match-list { font-size: 12.5px; color: var(--muted); max-height: 200px; overflow: auto; }
.match-list div { padding: 2px 0; border-bottom: 1px dashed var(--border); }

.cron-result { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 14px; }
.cron-result .ok { color: var(--ok); font-weight: 600; }
.cron-result .bad { color: var(--err); font-weight: 600; }
.cron-result ul { margin: 8px 0 0 18px; font-size: 13.5px; }

.all-bases { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 8px; margin-top: 12px; }
.all-bases .base-item { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; font-size: 12px; }
.all-bases .base-item b { color: var(--brand); font-weight: 600; }
.all-bases .base-item .mono { word-break: break-all; font-size: 13px; }

.unit-result { font-size: 18px; }
.color-preview { height: 64px; border-radius: 10px; border: 1px solid var(--border); margin-bottom: 14px; }
.color-input { width: 100%; height: 40px; padding: 2px; border: 1px solid var(--border); border-radius: 8px; background: var(--card); cursor: pointer; }
.bmi-result strong.bmi-val { font-size: 30px; color: var(--brand); }
.bmi-tag { display: inline-block; padding: 2px 12px; border-radius: 999px; color: #fff; font-size: 13px; margin-left: 8px; }
.loan-result table { width: 100%; border-collapse: collapse; font-size: 14px; }
.loan-result td { padding: 6px 4px; border-bottom: 1px dashed var(--border); }
.loan-result td:last-child { text-align: right; font-family: ui-monospace, Consolas, monospace; font-weight: 600; }

.img-result { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 14px; }
.img-result figure { border: 1px solid var(--border); border-radius: 10px; padding: 10px; text-align: center; background: var(--bg); }
.img-result img { max-width: 100%; max-height: 260px; }
.img-result figcaption { font-size: 12.5px; color: var(--muted); margin-top: 6px; }
.img-preview { margin-bottom: 14px; text-align: center; }
.img-preview img { max-width: 100%; max-height: 300px; border: 1px solid var(--border); border-radius: 10px; padding: 8px; background: var(--card); }
.qr-preview { display: flex; justify-content: center; padding: 16px; background: #fff; border-radius: 10px; border: 1px solid var(--border); min-height: 60px; }

.now-ts { margin-top: 16px; display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

/* ===== 工具页扩展内容 ===== */
.tool-extra h2 { font-size: 19px; margin: 26px 0 12px; }
.howto { margin-left: 20px; color: var(--muted); font-size: 14.5px; }
.howto li { margin-bottom: 6px; }
.faq details { background: var(--card); border: 1px solid var(--border); border-radius: 10px; margin-bottom: 10px; padding: 0 16px; }
.faq summary { cursor: pointer; font-weight: 600; padding: 12px 0; font-size: 14.5px; }
.faq details p { color: var(--muted); padding-bottom: 12px; font-size: 14px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { background: var(--brand-soft); border-radius: 999px; padding: 4px 14px; font-size: 13px; color: var(--brand); }
.tag:hover { background: var(--brand); color: #fff; }

.related { margin-top: 30px; }
.home-seo { margin-top: 44px; padding: 24px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); color: var(--muted); font-size: 14px; }
.home-seo h2 { color: var(--text); font-size: 17px; margin-bottom: 10px; }
.home-seo p { margin-bottom: 8px; }

/* ===== 单页内容 ===== */
.page-content { padding: 24px; }
.page-content h2 { font-size: 17px; margin: 18px 0 8px; }
.page-content p, .page-content li { font-size: 14.5px; color: var(--text); }
.page-content ul, .page-content ol { margin-left: 20px; margin-bottom: 10px; }
.page-content p { margin-bottom: 10px; }
.contact-form { margin-top: 8px; }

/* ===== 404 ===== */
.center-404 { text-align: center; padding: 80px 0; }
.center-404 h1 { font-size: 72px; color: var(--brand); }

/* ===== 广告位 ===== */
.ad-slot { margin: 18px 0; text-align: center; overflow: hidden; }

/* ===== Cookie 横幅 ===== */
.cookie-banner {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 200;
  background: var(--card); border-top: 1px solid var(--border);
  box-shadow: 0 -4px 16px rgba(0,0,0,.08);
  padding: 12px 16px; display: flex; gap: 14px; align-items: center; justify-content: center; flex-wrap: wrap;
}
.cookie-banner p { font-size: 13px; color: var(--muted); flex: 1; min-width: 260px; }
.cookie-banner[hidden] { display: none !important; }

/* ===== 技术博客 ===== */
.blog-list { margin-top: 18px; }
.blog-meta { font-size: 12.5px; color: var(--muted); margin-top: 6px; }
.blog-content { padding: 26px; }
.blog-content h2 { font-size: 1.35rem; margin: 26px 0 12px; }
.blog-content h3 { font-size: 1.12rem; margin: 20px 0 10px; }
.blog-content h4 { font-size: 1rem; margin: 16px 0 8px; }
.blog-content p { margin: 10px 0; line-height: 1.85; }
.blog-content ul, .blog-content ol { margin: 10px 0 10px 22px; line-height: 1.85; }
.blog-content pre { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 14px; overflow-x: auto; font-size: 13px; margin: 14px 0; }
.blog-content code { font-family: Consolas, Monaco, monospace; font-size: 13px; }
.blog-content blockquote { border-left: 3px solid var(--border); margin: 12px 0; padding: 4px 14px; color: var(--muted); }
.blog-content table { border-collapse: collapse; width: 100%; margin: 14px 0; }
.blog-content th, .blog-content td { border: 1px solid var(--border); padding: 8px 10px; font-size: 14px; }
.pager { margin-top: 24px; display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.pager a, .pager span { padding: 6px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 13.5px; color: var(--text); }
.pager span.cur { background: var(--brand); color: #fff; border-color: var(--brand); }

/* ===== 页脚 ===== */
.site-footer { background: var(--card); border-top: 1px solid var(--border); margin-top: 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 24px; padding: 32px 16px 20px; }
.footer-grid h3 { font-size: 14px; margin-bottom: 10px; }
.footer-grid a { display: block; color: var(--muted); font-size: 13px; margin-bottom: 6px; }
.footer-grid a:hover { color: var(--brand); }
.footer-grid p { font-size: 13px; color: var(--muted); }
.footer-bottom { border-top: 1px solid var(--border); padding: 14px 16px; }
.footer-bottom p { font-size: 12.5px; color: var(--muted); text-align: center; }

/* ===== 后台管理 ===== */
.admin-wrap { display: flex; min-height: 100vh; }
.admin-side { width: 210px; background: #1e2333; color: #cbd5e1; padding: 18px 0; flex-shrink: 0; }
.admin-side .logo { color: #fff; padding: 0 20px 16px; display: block; border-bottom: 1px solid #2a3040; margin-bottom: 12px; }
.admin-side a { display: block; padding: 10px 20px; color: #cbd5e1; font-size: 14px; }
.admin-side a:hover, .admin-side a.active { background: rgba(255,255,255,.08); color: #fff; }
.admin-main { flex: 1; padding: 24px 28px; background: var(--bg); min-width: 0; }
.admin-main h1 { font-size: 22px; margin-bottom: 18px; }
.admin-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; box-shadow: var(--shadow); }
.admin-card h2 { font-size: 16px; margin-bottom: 14px; }
.admin-form label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 5px; }
.admin-form input[type=text], .admin-form input[type=password], .admin-form input[type=number], .admin-form input[type=email], .admin-form select, .admin-form textarea {
  width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg); color: var(--text); font-size: 14px; font-family: inherit; outline: none;
}
.admin-form textarea { resize: vertical; }
.admin-form input:focus, .admin-form textarea:focus, .admin-form select:focus { border-color: var(--brand); }
.admin-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; margin-bottom: 20px; }
.admin-stats .stat-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.admin-stats .stat-card .n { font-size: 26px; font-weight: 700; color: var(--brand); display: block; }
.admin-stats .stat-card .t { font-size: 13px; color: var(--muted); }
.admin-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.admin-table th, .admin-table td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
.admin-table th { color: var(--muted); font-weight: 600; font-size: 12.5px; }
.admin-table tr:hover td { background: var(--brand-soft); }
.admin-login { max-width: 380px; margin: 80px auto; }
.admin-login .admin-card { padding: 28px; }
.admin-login h1 { text-align: center; margin-bottom: 20px; font-size: 22px; }
.match-preview { font-size: 13px; }
.match-preview .hit { color: var(--ok); }
.match-preview .miss { color: var(--err); }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .hero h1 { font-size: 24px; }
  .nav { display: none; }
  .diff-grid { grid-template-columns: 1fr; }
  .img-result { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .admin-wrap { flex-direction: column; }
  .admin-side { width: 100%; padding: 8px 0; }
  .admin-side a { display: inline-block; padding: 8px 12px; }
  .admin-side .logo { border: none; margin: 0; padding: 8px 12px; }
}

/* ===== 首页改版（Hero / 热门标签 / 左侧分类导航 / 特性区） ===== */
.hero { padding: 60px 0 40px; background: linear-gradient(180deg, var(--brand-soft), var(--bg)); }
.hero h1 { font-size: 38px; margin-bottom: 14px; letter-spacing: -0.5px; }
.trending { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; align-items: center; }
.trending-label { font-size: 13.5px; color: var(--muted); }
.chip-hot { background: var(--card); }
.chip-hot:hover { background: var(--brand-soft); }

.home-layout { display: grid; grid-template-columns: 216px minmax(0, 1fr); gap: 26px; align-items: start; margin-top: 30px; }
.home-aside { position: sticky; top: 14px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 10px; }
.aside-title { font-size: 13px; font-weight: 600; color: var(--muted); padding: 2px 10px 10px; letter-spacing: 1px; }
.aside-link { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 9px 12px; border-radius: 9px; font-size: 14px; color: var(--text); margin-bottom: 2px; }
.aside-link:hover { background: var(--brand-soft); color: var(--brand); }
.aside-link.active { background: var(--brand-soft); color: var(--brand); font-weight: 600; }
.aside-link.dimmed { opacity: 0.35; }
.aside-count { font-size: 12px; color: var(--muted); background: var(--bg); border-radius: 20px; padding: 1px 8px; }
.home-main .tool-section { scroll-margin-top: 20px; }
.tool-use { font-size: 13px; color: var(--brand); font-weight: 500; margin-top: auto; }
.tool-card { transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease; }
.ai-badge { font-size: 11px; font-weight: 600; color: #fff; background: linear-gradient(135deg, #6366f1, #8b5cf6); border-radius: 5px; padding: 1px 6px; vertical-align: 2px; }
.no-result { padding: 30px 10px; text-align: center; }

.home-features { margin-top: 46px; padding: 44px 0; background: var(--card); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-top: 20px; }
.feature-card { padding: 22px 20px; text-align: left; }
.feature-icon { font-size: 26px; }
.feature-card h3 { font-size: 16px; margin: 10px 0 6px; }
.feature-card p { font-size: 13.5px; color: var(--muted); line-height: 1.7; }

.home-faq { margin: 44px auto 10px; max-width: 860px; }
.home-seo-note { margin-top: 16px; font-size: 13.5px; line-height: 1.8; }

@media (max-width: 920px) {
  .home-layout { grid-template-columns: 1fr; gap: 18px; }
  .home-aside { position: static; display: flex; overflow-x: auto; gap: 4px; padding: 10px; -webkit-overflow-scrolling: touch; }
  .aside-title { display: none; }
  .aside-link { flex: 0 0 auto; white-space: nowrap; margin-bottom: 0; }
  .aside-count { display: none; }
  .hero h1 { font-size: 27px; }
}

/* ===== 分类专属页 + 专业感升级 ===== */
.site-header { backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); background: var(--card); background: color-mix(in srgb, var(--card) 88%, transparent); box-shadow: 0 1px 10px rgba(0,0,0,.04); }
.logo::before { content: "🧰"; font-size: 20px; }
.cat-hero { display: flex; gap: 20px; align-items: flex-start; padding: 26px 28px; margin-top: 18px; background: linear-gradient(135deg, var(--brand-soft), var(--card)); }
.cat-icon { font-size: 44px; line-height: 1; }
.cat-h1 { font-size: 26px; margin-bottom: 8px; }
.cat-desc { color: var(--muted); line-height: 1.75; margin-bottom: 12px; }
.cat-stats { display: flex; flex-wrap: wrap; gap: 8px; }
.stat-chip { font-size: 12.5px; color: var(--text); background: var(--card); border: 1px solid var(--border); border-radius: 999px; padding: 4px 12px; }
.cat-section { margin-top: 34px; }
.cat-ico { margin-right: 2px; }
.aside-ico { margin-right: 6px; }
.cat-card { padding: 16px; }
.cat-card-icon { font-size: 26px; margin-bottom: 6px; display: block; }
.cat-card:hover { border-color: var(--brand); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.09); }
.tool-card:hover { border-color: var(--brand); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.09); }
@media (max-width: 640px) {
  .cat-hero { flex-direction: column; gap: 12px; padding: 20px; }
  .cat-icon { font-size: 36px; }
  .cat-h1 { font-size: 21px; }
}