/* 轻舟工具箱 —— 全站样式（无外部依赖、无 Web 字体、无图片） */

:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --panel-2: #fbfcfd;
  --ink: #14181e;
  --ink-2: #3d4753;
  --muted: #6b7684;
  --line: #e4e8ee;
  --accent: #0e7a6e;
  --accent-2: #0b5f56;
  --accent-ink: #ffffff;
  --accent-soft: rgba(14, 122, 110, .09);
  --code-bg: #f1f4f8;
  --radius: 13px;
  --radius-s: 9px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 10px 28px -18px rgba(16, 24, 40, .28);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Noto Sans SC", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1014;
    --panel: #151a20;
    --panel-2: #11161b;
    --ink: #e7ecf2;
    --ink-2: #c2ccd8;
    --muted: #8b97a6;
    --line: #232b35;
    --accent: #2fd6bd;
    --accent-2: #5ce4cf;
    --accent-ink: #05221e;
    --accent-soft: rgba(47, 214, 189, .12);
    --code-bg: #1a212a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .5);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3 { line-height: 1.3; margin: 0 0 .5em; }
h1 { font-size: 1.85rem; letter-spacing: -.01em; }
h2 { font-size: 1.25rem; margin-top: 2em; }
h3 { font-size: 1.02rem; margin-top: 1.6em; }
p { margin: 0 0 1em; }

code {
  font-family: var(--mono);
  font-size: .9em;
  background: var(--code-bg);
  padding: .12em .38em;
  border-radius: 5px;
}

.wrap { max-width: 1060px; margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }

/* ---------- 顶栏 ---------- */
.site-head {
  position: sticky; top: 0; z-index: 20;
  background: rgba(246, 247, 249, .88);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
@media (prefers-color-scheme: dark) {
  .site-head { background: rgba(13, 16, 20, .88); }
}

.head-inner { display: flex; align-items: center; gap: 18px; height: 62px; }

.brand {
  display: flex; align-items: center; gap: 9px;
  font-weight: 700; color: var(--ink); font-size: 1.06rem; letter-spacing: .01em;
}
.brand:hover { text-decoration: none; }
.brand svg { width: 26px; height: 26px; color: var(--accent); flex: 0 0 auto; }
.brand small {
  display: block; font-weight: 400; font-size: .68rem; color: var(--muted);
  letter-spacing: .09em; margin-top: -4px;
}

.nav { display: flex; gap: 4px; margin-left: 8px; }
.nav a { color: var(--ink-2); padding: 6px 11px; border-radius: 8px; font-size: .94rem; }
.nav a:hover { background: var(--accent-soft); color: var(--accent); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); font-weight: 600; }

.head-search { margin-left: auto; position: relative; flex: 0 1 260px; }
.head-search input {
  width: 100%; height: 36px; padding: 0 12px 0 34px; border-radius: 9px;
  border: 1px solid var(--line); background: var(--panel); color: var(--ink); font-size: .9rem;
}
.head-search input:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.head-search svg { position: absolute; left: 10px; top: 9px; width: 16px; height: 16px; color: var(--muted); }

@media (max-width: 720px) {
  .head-inner { height: auto; flex-wrap: wrap; padding: 10px 20px; gap: 8px; }
  .head-search { flex: 1 1 100%; margin-left: 0; order: 3; }
  .nav { margin-left: auto; }
  .nav a { padding: 6px 9px; font-size: .9rem; }
}

/* ---------- 首页 ---------- */
.hero { padding: 46px 0 10px; }
.hero h1 { font-size: 2.05rem; }
.hero .lead { color: var(--ink-2); max-width: 46em; font-size: 1.03rem; }
.hero .tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 0; padding: 0; list-style: none; }
.hero .tags li {
  font-size: .82rem; color: var(--muted); border: 1px solid var(--line);
  border-radius: 999px; padding: 3px 11px; background: var(--panel);
}

.sec-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin: 34px 0 14px; }
.sec-head h2 { margin: 0; font-size: 1.12rem; }
.sec-head span { font-size: .85rem; color: var(--muted); }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(236px, 1fr)); gap: 14px; }

.card {
  display: block; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 16px 16px 14px; color: var(--ink);
  box-shadow: var(--shadow); transition: transform .12s ease, border-color .12s ease;
}
.card:hover { text-decoration: none; transform: translateY(-2px); border-color: var(--accent); }
.card .ico {
  width: 34px; height: 34px; border-radius: 9px; background: var(--accent-soft);
  color: var(--accent); display: grid; place-items: center; margin-bottom: 10px;
}
.card .ico svg { width: 19px; height: 19px; }
.card h3 { margin: 0 0 4px; font-size: .98rem; font-weight: 650; }
.card p { margin: 0; color: var(--muted); font-size: .84rem; line-height: 1.5; }
.card[hidden] { display: none; }

.empty {
  padding: 28px; text-align: center; color: var(--muted);
  border: 1px dashed var(--line); border-radius: var(--radius); display: none;
}
.empty.on { display: block; }

/* ---------- 工具页 ---------- */
.crumb { font-size: .83rem; color: var(--muted); padding: 18px 0 0; }
.crumb a { color: var(--muted); }

.tool-head { padding: 6px 0 18px; border-bottom: 1px solid var(--line); margin-bottom: 22px; }
.tool-head p { margin: .4em 0 0; color: var(--ink-2); max-width: 52em; }

.panel {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px;
}
.panel + .panel { margin-top: 16px; }

.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.row.spread { justify-content: space-between; }

label.fld { display: block; font-size: .82rem; color: var(--muted); margin: 0 0 5px; }

textarea, input[type=text], input[type=number], select {
  width: 100%; font: inherit; font-size: .92rem; color: var(--ink);
  background: var(--panel-2); border: 1px solid var(--line);
  border-radius: var(--radius-s); padding: 9px 11px;
}
textarea { font-family: var(--mono); font-size: .86rem; line-height: 1.55; resize: vertical; min-height: 132px; }
textarea:focus, input:focus, select:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
select { width: auto; min-width: 120px; }

button {
  font: inherit; font-size: .9rem; font-weight: 600; color: var(--accent-ink);
  background: var(--accent); border: 1px solid transparent;
  border-radius: var(--radius-s); padding: 8px 15px; cursor: pointer;
}
button:hover { background: var(--accent-2); }
button.ghost { background: transparent; color: var(--ink-2); border-color: var(--line); }
button.ghost:hover { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
button:disabled { opacity: .5; cursor: not-allowed; }

.out {
  font-family: var(--mono); font-size: .86rem; line-height: 1.55;
  white-space: pre-wrap; word-break: break-word;
  background: var(--code-bg); border: 1px solid var(--line);
  border-radius: var(--radius-s); padding: 11px 12px; min-height: 44px; margin: 0;
}
.out:empty::before { content: "结果会显示在这里"; color: var(--muted); font-family: var(--sans); }

.hint { font-size: .8rem; color: var(--muted); margin: 8px 0 0; }
.err { color: #c0392b; }
@media (prefers-color-scheme: dark) { .err { color: #ff8f80; } }

.kv { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; font-size: .9rem; margin: 0; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; font-family: var(--mono); word-break: break-all; }

.swatch { width: 100%; height: 56px; border-radius: var(--radius-s); border: 1px solid var(--line); }

.rel { margin-top: 34px; }
.rel .grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }

.prose { max-width: 46em; }
.prose h2 { margin-top: 1.9em; }
.prose h2:first-child { margin-top: 0; }
.prose ul { padding-left: 1.2em; }
.prose li { margin: .3em 0; }

/* ---------- 页脚 ---------- */
.site-foot {
  border-top: 1px solid var(--line); margin-top: 56px; padding: 26px 0 40px;
  color: var(--muted); font-size: .85rem;
}
.foot-inner { display: flex; flex-wrap: wrap; gap: 10px 26px; justify-content: space-between; }
.site-foot a { color: var(--muted); }
.site-foot .links { display: flex; gap: 16px; flex-wrap: wrap; }

@media print {
  .site-head, .site-foot, .rel, .head-search { display: none; }
  body { background: #fff; color: #000; }
  .panel, .card { box-shadow: none; }
}