:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #171a21;
  --text2: #5b6473;
  --text3: #8b94a3;
  --border: #e5e8ef;
  --border2: #d6dae3;
  --brand: #534ab7;
  --brand2: #7f77dd;
  --brand-soft: #eeedfe;
  --ok: #0f6e56;
  --ok-soft: #e1f5ee;
  --err: #a32d2d;
  --err-soft: #fcebeb;
  --r: 12px;
  --rs: 8px;
  --sh: 0 1px 2px rgba(16, 24, 40, .04), 0 6px 16px rgba(16, 24, 40, .05);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* ---------- header ---------- */
header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.hd { display: flex; align-items: center; gap: 16px; height: 60px; }
.logo { display: flex; align-items: center; gap: 9px; font-weight: 600; font-size: 17px; letter-spacing: -.2px; white-space: nowrap; }
.logo .mk {
  width: 28px; height: 28px; border-radius: 8px;
  background: var(--brand); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 600;
}
.logo span.sub { font-size: 12px; color: var(--text3); font-weight: 400; }
.hd nav { display: flex; gap: 18px; font-size: 14px; color: var(--text2); }
.hd nav a:hover { color: var(--brand); }
.hd .spacer { flex: 1; }

/* ---------- hero ---------- */
.hero { padding: 44px 0 22px; text-align: center; }
.hero h1 { font-size: 30px; line-height: 1.35; margin: 0 0 10px; font-weight: 600; letter-spacing: -.5px; }
.hero p { margin: 0; color: var(--text2); font-size: 15px; }
.search {
  max-width: 460px; margin: 22px auto 0;
  display: flex; align-items: center; gap: 8px;
  background: var(--surface); border: 1px solid var(--border2);
  border-radius: 999px; padding: 0 16px; height: 44px; box-shadow: var(--sh);
}
.search input { flex: 1; border: 0; outline: 0; background: transparent; font-size: 14px; font-family: inherit; color: var(--text); }
.search svg { flex: none; opacity: .45; }

/* ---------- grid ---------- */
.sect { padding: 26px 0 8px; }
.sect h2 { font-size: 15px; font-weight: 600; margin: 0 0 14px; display: flex; align-items: center; gap: 8px; }
.sect h2::before { content: ""; width: 3px; height: 14px; border-radius: 2px; background: var(--brand); }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(238px, 1fr)); gap: 14px; }

.card {
  display: block; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--r); padding: 15px 16px; transition: .16s; position: relative;
}
.card:hover { border-color: var(--brand2); transform: translateY(-2px); box-shadow: var(--sh); }
.card .ic {
  width: 34px; height: 34px; border-radius: 9px; background: var(--brand-soft); color: var(--brand);
  display: flex; align-items: center; justify-content: center; font-size: 16px; font-weight: 600; margin-bottom: 10px;
}
.card b { display: block; font-size: 15px; font-weight: 600; margin-bottom: 3px; }
.card small { display: block; color: var(--text3); font-size: 13px; line-height: 1.5; }

/* ---------- tool page ---------- */
.crumb { font-size: 13px; color: var(--text3); padding: 18px 0 0; }
.crumb a:hover { color: var(--brand); }
.tool { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r); padding: 20px; margin: 14px 0; box-shadow: var(--sh); }
.tool h1 { font-size: 22px; font-weight: 600; margin: 10px 0 6px; letter-spacing: -.3px; }
.tool .desc { color: var(--text2); font-size: 14px; margin: 0; }

.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 14px; }
.row.grow > * { flex: 1; min-width: 130px; }

label.fld { display: block; font-size: 13px; color: var(--text2); margin-bottom: 5px; }

input[type=text], input[type=number], input[type=date], input[type=color], select, textarea {
  width: 100%; font-family: inherit; font-size: 14px; color: var(--text);
  background: var(--surface); border: 1px solid var(--border2); border-radius: var(--rs);
  padding: 9px 11px; outline: 0; transition: .15s;
}
input:focus, select:focus, textarea:focus { border-color: var(--brand2); box-shadow: 0 0 0 3px var(--brand-soft); }
textarea { resize: vertical; min-height: 140px; line-height: 1.6; font-size: 14px; }
select { cursor: pointer; }
input[type=color] { padding: 3px; height: 40px; cursor: pointer; }
input[type=range] { width: 100%; accent-color: var(--brand); }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 14px; }
@media (max-width: 720px) { .split { grid-template-columns: 1fr; } }

button, .btn {
  font-family: inherit; font-size: 14px; font-weight: 500; cursor: pointer;
  border: 1px solid var(--border2); background: var(--surface); color: var(--text);
  border-radius: var(--rs); padding: 9px 15px; transition: .15s; display: inline-flex;
  align-items: center; justify-content: center; gap: 6px;
}
button:hover, .btn:hover { border-color: var(--brand2); color: var(--brand); }
button.pri, .btn.pri { background: var(--brand); border-color: var(--brand); color: #fff; }
button.pri:hover, .btn.pri:hover { background: #453ca0; color: #fff; }
button:active { transform: translateY(1px); }

.out {
  margin-top: 14px; background: #fbfbfd; border: 1px solid var(--border);
  border-radius: var(--rs); padding: 12px 14px; font-size: 14px;
  white-space: pre-wrap; word-break: break-all; max-height: 320px; overflow: auto;
}
.out.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; line-height: 1.65; }

.msg { font-size: 13px; margin-top: 10px; display: none; }
.msg.ok { display: block; color: var(--ok); }
.msg.err { display: block; color: var(--err); }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); gap: 10px; margin-top: 14px; }
.stat { background: var(--brand-soft); border-radius: var(--rs); padding: 11px 13px; }
.stat b { display: block; font-size: 20px; font-weight: 600; color: var(--brand); line-height: 1.3; }
.stat span { font-size: 12px; color: var(--text2); }

table.tb { width: 100%; border-collapse: collapse; font-size: 14px; margin-top: 14px; }
table.tb th, table.tb td { border-bottom: 1px solid var(--border); padding: 9px 10px; text-align: right; }
table.tb th { color: var(--text2); font-weight: 500; background: #fbfbfd; }
table.tb th:first-child, table.tb td:first-child { text-align: left; }
.tbbox { max-height: 380px; overflow: auto; margin-top: 14px; border: 1px solid var(--border); border-radius: var(--rs); }
.tbbox table.tb { margin: 0; }
.tbbox table.tb th { position: sticky; top: 0; z-index: 1; }

.drop {
  margin-top: 14px; border: 1.5px dashed var(--border2); border-radius: var(--r);
  padding: 30px 20px; text-align: center; color: var(--text2); font-size: 14px; cursor: pointer; transition: .15s;
}
.drop:hover, .drop.over { border-color: var(--brand2); background: var(--brand-soft); color: var(--brand); }

.thumbs { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.thumbs img { width: 96px; height: 96px; object-fit: cover; border-radius: var(--rs); border: 1px solid var(--border); background: #f4f4f6; }

.preview { margin-top: 14px; border: 1px solid var(--border); border-radius: var(--rs); padding: 16px; background: #fbfbfd; max-height: 340px; overflow: auto; }

/* ---------- seo content ---------- */
.art { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r); padding: 22px; margin: 14px 0 40px; }
.art h2 { font-size: 17px; font-weight: 600; margin: 22px 0 8px; }
.art h2:first-child { margin-top: 0; }
.art h3 { font-size: 15px; font-weight: 600; margin: 16px 0 6px; }
.art p, .art li { color: var(--text2); font-size: 14.5px; }
.art ul { padding-left: 20px; margin: 8px 0; }
.art code { background: #f1f2f6; padding: 1px 6px; border-radius: 4px; font-size: 13px; }

footer { border-top: 1px solid var(--border); margin-top: 40px; padding: 26px 0 40px; color: var(--text3); font-size: 13px; background: var(--surface); }
footer .fl { display: flex; flex-wrap: wrap; gap: 18px; margin-bottom: 10px; }
footer a:hover { color: var(--brand); }

@media (max-width: 720px) {
  .hero h1 { font-size: 24px; }
  .hd nav { display: none; }
  .tool { padding: 16px; }
}