/* ============ Data5U Tools 全站样式 ============ */
:root {
  --bg: #f6f7fb; --surface: #ffffff; --border: #e6e8f0;
  --text: #1c2333; --muted: #6b7280; --primary: #4f6ef7; --primary-dark: #3d55d9;
  --primary-soft: #eef1fe; --accent: #f59e0b; --radius: 12px;
  --shadow: 0 1px 3px rgba(28,35,51,.06), 0 4px 16px rgba(28,35,51,.05);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.65 -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans", "Malgun Gothic", sans-serif; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
.wrap.narrow { max-width: 760px; }

/* ---- Header ---- */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; gap: 18px; height: 60px; }
.logo { font-size: 18px; font-weight: 700; color: var(--text); white-space: nowrap; }
.logo span { background: linear-gradient(120deg, var(--primary), #8b5cf6);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.main-nav { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; flex: 1; }
.main-nav::-webkit-scrollbar { display: none; }
.nav-cat { padding: 6px 10px; border-radius: 8px; color: var(--muted); font-size: 13.5px; white-space: nowrap; }
.nav-cat:hover { background: var(--primary-soft); color: var(--primary); }
.header-actions { display: flex; gap: 8px; align-items: center; }
.search-box { position: relative; }
.search-box input { width: 190px; padding: 7px 12px; border: 1px solid var(--border);
  border-radius: 10px; font-size: 13.5px; background: var(--bg); outline: none; }
.search-box input:focus { border-color: var(--primary); background: #fff; width: 230px; }
.search-drop { position: absolute; top: 110%; left: 0; right: 0; min-width: 280px; max-height: 380px;
  overflow: auto; background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  box-shadow: var(--shadow); display: none; z-index: 60; }
.search-drop.open { display: block; }
.search-drop a { display: flex; gap: 8px; padding: 8px 12px; color: var(--text); align-items: baseline; }
.search-drop a:hover { background: var(--primary-soft); }
.search-drop .d { font-size: 12px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#langSwitch { padding: 6px 8px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface); font-size: 13px; color: var(--text); cursor: pointer; }

/* ---- Hero ---- */
.hero { text-align: center; padding: 46px 0 26px; }
.hero h1 { font-size: 32px; margin: 0 0 10px; }
.hero p { color: var(--muted); max-width: 720px; margin: 0 auto 22px; }
.hero-search input { width: min(560px, 92vw); padding: 13px 18px; font-size: 15px; border-radius: 14px; }
.hero-search .search-drop { left: 50%; transform: translateX(-50%); width: min(560px, 92vw); right: auto; }

/* ---- Cards / Grid ---- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.card { display: flex; flex-direction: column; gap: 5px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 16px;
  color: var(--text); transition: transform .15s, box-shadow .15s, border-color .15s; }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: #d5daf5; color: var(--text); }
.card-icon { font-size: 22px; }
.card-name { font-weight: 600; font-size: 15px; }
.card-desc { font-size: 12.5px; color: var(--muted); line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.popular, .cat-section { margin: 34px 0; }
.cat-title { font-size: 20px; display: flex; align-items: baseline; gap: 10px; }
.cat-title small, .page-title small { color: var(--muted); font-weight: 400; font-size: 13px; }
.cat-title a { color: var(--text); }
.page-title { font-size: 26px; margin: 30px 0 6px; }
.page-desc { color: var(--muted); margin-top: 0; }

/* ---- 工具页 ---- */
.tool-main { padding: 24px 0 40px; }
.crumb { font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.crumb a { color: var(--muted); }
.tool-card { background: var(--surface); border: 1px solid var(--border);
  border-radius: 16px; padding: 28px; box-shadow: var(--shadow); }
.tool-title { margin: 0 0 6px; font-size: 24px; }
.tool-desc { color: var(--muted); margin: 0 0 10px; }
.tool-privacy { font-size: 12.5px; color: #0a7d43; background: #ecfaf2; border: 1px solid #d3f2e0;
  padding: 6px 12px; border-radius: 8px; display: inline-block; margin-bottom: 18px; }
.tool-body textarea { width: 100%; min-height: 130px; padding: 12px; border: 1px solid var(--border);
  border-radius: 10px; font: 13.5px/1.6 ui-monospace, Consolas, "Courier New", monospace;
  resize: vertical; outline: none; background: var(--surface); color: var(--text); }
.tool-body textarea:focus { border-color: var(--primary); }
.tool-body input[type=text], .tool-body input[type=number], .tool-body input[type=date],
.tool-body input[type=datetime-local], .tool-body select {
  padding: 9px 12px; border: 1px solid var(--border); border-radius: 9px; font-size: 14px;
  background: var(--surface); color: var(--text); outline: none; }
.tool-body input:focus, .tool-body select:focus { border-color: var(--primary); }
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 9px 18px; border: none;
  border-radius: 9px; background: var(--primary); color: #fff; font-size: 14px; cursor: pointer; }
.btn:hover { background: var(--primary-dark); color: #fff; }
.btn.secondary { background: var(--surface); color: var(--text); border: 1px solid var(--border); }
.btn.secondary:hover { border-color: var(--primary); color: var(--primary); }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.io-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.io-grid label { font-size: 13px; color: var(--muted); display: block; margin-bottom: 6px; }
.result-box { background: var(--bg); border: 1px dashed var(--border); border-radius: 10px;
  padding: 12px; min-height: 44px; font: 13.5px/1.7 ui-monospace, Consolas, monospace;
  word-break: break-all; white-space: pre-wrap; }
.form-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 10px 0; }
.form-row label { font-size: 13.5px; display: flex; gap: 6px; align-items: center; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 10px; margin-top: 12px; }
.stat { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; text-align: center; }
.stat b { display: block; font-size: 20px; color: var(--primary); }
.stat span { font-size: 12px; color: var(--muted); }
.diff-add { background: #e8f8ee; color: #0a7d43; display: block; }
.diff-del { background: #fdecec; color: #c0392b; display: block; text-decoration: line-through; }
.hl-match { background: #fff3c4; border-radius: 3px; padding: 0 1px; }
.kv-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.kv-table td { border-bottom: 1px solid var(--border); padding: 8px 6px; word-break: break-all; }
.kv-table td:first-child { color: var(--muted); width: 180px; }
.big-num { font-size: 42px; font-weight: 700; color: var(--primary); text-align: center; margin: 8px 0; }
.related { margin-top: 34px; }
.related h2 { font-size: 18px; }

/* ---- 工具页 SEO 内容区块 ---- */
.tool-guide { background: var(--surface); border: 1px solid var(--border); border-radius: 16px;
  padding: 24px 28px; margin-top: 18px; box-shadow: var(--shadow); }
.tool-guide h2 { font-size: 17px; margin: 20px 0 8px; padding-left: 10px;
  border-left: 3px solid var(--primary); }
.tool-guide h2:first-child { margin-top: 0; }
.tool-guide p { color: var(--text); margin: 0; }
.guide-steps { margin: 0; padding-left: 22px; }
.guide-steps li { margin: 6px 0; }
.faq-list { display: flex; flex-direction: column; gap: 8px; }
.faq-item { border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.faq-item summary { padding: 11px 14px; cursor: pointer; font-weight: 600; font-size: 14px;
  background: var(--bg); list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before { content: '❓ '; }
.faq-item[open] summary { color: var(--primary); }
.faq-item p { padding: 10px 14px; margin: 0; color: var(--muted); font-size: 13.5px; }

/* ---- 广告位 ---- */
.ad-slot:empty { display: none !important; }
#ad-top, #ad-middle { margin: 18px 0; text-align: center; min-height: 0; }
.ad-float-left, .ad-float-right { position: fixed; top: 90px; width: 150px; z-index: 30; }
.ad-float-left { left: max(8px, calc(50vw - 590px - 170px)); }
.ad-float-right { right: max(8px, calc(50vw - 590px - 170px)); }
@media (max-width: 1440px) { .ad-float-left, .ad-float-right { display: none; } }

/* ---- Footer ---- */
.site-footer { background: var(--surface); border-top: 1px solid var(--border);
  margin-top: 50px; padding: 30px 0 20px; text-align: center; color: var(--muted); font-size: 13px; }
.footer-brand { font-size: 15px; color: var(--text); margin-bottom: 10px; }
.footer-links { margin-bottom: 8px; }
.footer-links a { color: var(--muted); }
.footer-extra a { color: var(--muted); }
#ad-footer { margin-top: 16px; }

/* ---- 响应式 ---- */
@media (max-width: 860px) {
  .main-nav { display: none; }
  .io-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 24px; }
  .tool-card { padding: 18px; }
  .search-box input { width: 120px; }
  .search-box input:focus { width: 150px; }
}