/* BoxKit — shared design system. No dependencies, no build step. */

:root {
  --bg: #fbfbfd;
  --card: #ffffff;
  --ink: #14161a;
  --ink-2: #5a6270;
  --ink-3: #8b93a1;
  --line: #e6e9ef;
  --brand: #2f6feb;
  --brand-soft: #eaf1fe;
  --ok: #18a058;
  --warn: #e8a33d;
  --danger: #d9534f;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 8px 24px rgba(16, 24, 40, .06);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

html[data-theme="dark"] {
  --bg: #0e1116;
  --card: #151a21;
  --ink: #e8ecf2;
  --ink-2: #a2acbb;
  --ink-3: #6f7885;
  --line: #242b35;
  --brand: #4d8dff;
  --brand-soft: #16233a;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* ---------- header ---------- */
.site-head {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--card) 85%, transparent);
  backdrop-filter: saturate(1.6) blur(8px);
  position: sticky; top: 0; z-index: 20;
}
.site-head .wrap {
  display: flex; align-items: center; gap: 14px;
  height: 60px;
}
.logo {
  display: inline-flex; align-items: center; gap: 9px;
  font-weight: 700; font-size: 17px; letter-spacing: -.01em;
  color: var(--ink); text-decoration: none;
}
.logo:hover { text-decoration: none; }
.logo-mark {
  width: 26px; height: 26px; border-radius: 7px;
  background: linear-gradient(140deg, var(--brand), #7aa7ff);
  display: grid; place-items: center;
  color: #fff; font-size: 14px; font-weight: 800;
}
.head-spacer { flex: 1; }
.icon-btn {
  width: 34px; height: 34px; border-radius: var(--radius-sm);
  border: 1px solid var(--line); background: var(--card); color: var(--ink-2);
  display: grid; place-items: center; cursor: pointer; font-size: 15px;
}
.icon-btn:hover { color: var(--ink); border-color: var(--ink-3); }

/* ---------- layout ---------- */
main { flex: 1; padding: 34px 0 60px; }
.site-foot {
  border-top: 1px solid var(--line);
  padding: 22px 0; color: var(--ink-3); font-size: 13px;
}
.site-foot .wrap { display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: center; }

h1 { font-size: 26px; letter-spacing: -.02em; margin: 0 0 8px; }
h2 { font-size: 17px; letter-spacing: -.01em; margin: 0 0 12px; }
.lede { color: var(--ink-2); margin: 0 0 26px; max-width: 62ch; }

.crumb { font-size: 13px; color: var(--ink-3); margin: 0 0 16px; }
.crumb a { color: var(--ink-3); }

/* ---------- tool grid ---------- */
.search {
  width: 100%; max-width: 380px; padding: 10px 13px; margin-bottom: 22px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--card); color: var(--ink); font-family: inherit; font-size: 15px;
}
.search:focus { outline: 2px solid var(--brand-soft); border-color: var(--brand); }

.grid {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(232px, 1fr));
}
.card {
  display: block; padding: 16px 17px; border-radius: var(--radius);
  border: 1px solid var(--line); background: var(--card);
  box-shadow: var(--shadow); color: inherit; text-decoration: none;
  transition: transform .12s ease, border-color .12s ease;
}
.card:hover { transform: translateY(-2px); border-color: var(--brand); text-decoration: none; }
.card .t { font-weight: 650; margin-bottom: 4px; }
.card .d { color: var(--ink-2); font-size: 13.5px; line-height: 1.5; }
.empty { color: var(--ink-3); padding: 20px 0; }

/* ---------- panels & controls ---------- */
.panel {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); box-shadow: var(--shadow);
  padding: 18px; margin-bottom: 16px;
}
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.row + .row { margin-top: 10px; }

label.f { display: block; font-size: 13px; color: var(--ink-2); margin-bottom: 6px; }

textarea, input[type="text"], input[type="number"], select {
  width: 100%; padding: 10px 12px; font-family: var(--mono); font-size: 13.5px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--bg); color: var(--ink); resize: vertical;
}
textarea:focus, input:focus, select:focus {
  outline: 2px solid var(--brand-soft); border-color: var(--brand);
}
textarea { min-height: 150px; line-height: 1.55; }

.btn {
  padding: 9px 15px; border-radius: var(--radius-sm); cursor: pointer;
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
  font-family: inherit; font-size: 14px; font-weight: 550;
}
.btn:hover { border-color: var(--ink-3); }
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.primary:hover { filter: brightness(1.06); }

.stats { color: var(--ink-3); font-size: 13px; font-family: var(--mono); }
.err { color: var(--danger); font-size: 13.5px; min-height: 20px; }
.ok { color: var(--ok); font-size: 13.5px; }

.mono-out {
  font-family: var(--mono); font-size: 13px; white-space: pre-wrap; word-break: break-all;
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 12px; min-height: 44px;
}
.hint { color: var(--ink-3); font-size: 12.5px; margin-top: 8px; }

/* ---------- toast ---------- */
#toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px);
  background: var(--ink); color: var(--bg); padding: 9px 16px; border-radius: 999px;
  font-size: 13.5px; opacity: 0; pointer-events: none; transition: .2s ease; z-index: 99;
}
#toast.on { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 560px) {
  h1 { font-size: 22px; }
  main { padding: 24px 0 44px; }
}