/* 小工具集 · 全站样式（唯一阻塞渲染的资源，尽量精简） */
:root{
  --bg:#ffffff; --fg:#0f172a; --muted:#5b6b83; --line:#e3e8ef;
  --card:#f7f9fc; --accent:#2563eb; --accent-fg:#ffffff; --ok:#15803d; --err:#b91c1c;
  --radius:10px; --maxw:880px;
}
@media (prefers-color-scheme:dark){
  :root{ --bg:#0f172a; --fg:#e8eef8; --muted:#94a3b8; --line:#22304a;
         --card:#16233a; --accent:#4f8dfd; --ok:#4ade80; --err:#f87171; }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);
  font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.skip{position:absolute;left:-9999px}
.skip:focus{left:8px;top:8px;background:var(--accent);color:var(--accent-fg);padding:8px 12px;border-radius:6px;z-index:9}

.hdr{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;
  max-width:var(--maxw);margin:0 auto;padding:16px 20px;border-bottom:1px solid var(--line)}
.brand{font-weight:700;font-size:18px;color:var(--fg)}
.nav{display:flex;flex-wrap:wrap;gap:14px;font-size:14px}
.nav a{color:var(--muted)}
.nav a:hover{color:var(--accent)}

main{max-width:var(--maxw);margin:0 auto;padding:24px 20px 48px}
h1{font-size:26px;line-height:1.35;margin:0 0 8px}
h2{font-size:19px;margin:32px 0 10px;padding-top:8px}
h3{font-size:16px;margin:18px 0 6px}
.lede{color:var(--muted);margin:0 0 20px}
.prose p{margin:0 0 12px}
.prose ul{margin:0 0 12px;padding-left:22px}

.tool-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;margin:0 0 8px}
.field{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:0 0 12px}
.field:last-child{margin-bottom:0}
.field label{min-width:120px;font-size:14px;color:var(--muted)}
input,select,textarea,button{font:inherit;color:inherit}
input,select,textarea{background:var(--bg);border:1px solid var(--line);border-radius:8px;
  padding:8px 10px;min-width:0;flex:1 1 160px}
textarea{min-height:96px;resize:vertical;width:100%;flex-basis:100%}
button{background:var(--accent);color:var(--accent-fg);border:0;border-radius:8px;
  padding:9px 18px;cursor:pointer;font-weight:600}
button:hover{filter:brightness(1.08)}
button.ghost{background:transparent;color:var(--accent);border:1px solid var(--line)}
.out{margin-top:14px;padding:12px 14px;background:var(--bg);border:1px solid var(--line);
  border-radius:8px;white-space:pre-wrap;word-break:break-word;min-height:22px}
.out:empty{display:none}
.err{color:var(--err)}
.ok{color:var(--ok)}
.hint{font-size:13px;color:var(--muted);margin:6px 0 0}

.faq dt{font-weight:600;margin:14px 0 4px}
.faq dd{margin:0;color:var(--muted)}
.related ul{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:8px}
.related li{margin:0}
.related a{display:inline-block;padding:6px 12px;border:1px solid var(--line);
  border-radius:999px;font-size:14px;color:var(--fg)}
.related a:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px;
  list-style:none;padding:0;margin:16px 0 0}
.grid a{display:block;padding:12px 14px;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);color:var(--fg);font-size:15px}
.grid a:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}
.grid .cnt{display:block;font-size:12px;color:var(--muted);margin-top:2px}

.crumbs{font-size:13px;color:var(--muted);margin:0 0 12px}
.crumbs a{color:var(--muted)}

.ftr{max-width:var(--maxw);margin:0 auto;padding:24px 20px 40px;border-top:1px solid var(--line);
  font-size:14px;color:var(--muted)}
.ftr p{margin:0 0 8px}
.ftr-nav{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:8px}
.ftr-nav a{color:var(--muted)}
.copy{font-size:13px}

.ad-slot{margin:24px 0;min-height:0}

/* --- 表单补充 --- */
.field label.chk{min-width:0;display:inline-flex;align-items:center;gap:6px;
  font-size:14px;color:var(--fg);cursor:pointer}
.chks{display:flex;flex-wrap:wrap;gap:8px 16px;flex:1 1 100%}
.field input[type=color]{flex:0 0 56px;height:38px;padding:2px;cursor:pointer}
.field input[type=range]{flex:1 1 140px;padding:0;border:0;background:transparent;cursor:pointer}
.field input[type=checkbox]{flex:0 0 auto;min-width:0;width:16px;height:16px;accent-color:var(--accent)}
button.sm{padding:6px 12px;font-size:14px;font-weight:500}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px}
ol{margin:0 0 12px;padding-left:22px}
code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;
  background:var(--card);border:1px solid var(--line);border-radius:4px;padding:1px 5px}

/* --- 反应力测试 --- */
.rt-stage{display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:8px;height:220px;border-radius:var(--radius);background:#eef2f7;color:#0f172a;
  cursor:pointer;user-select:none;text-align:center;padding:16px;transition:background .06s}
.rt-stage:focus{outline:2px solid var(--accent);outline-offset:2px}
.rt-msg{font-size:22px;font-weight:700}
.rt-sub{font-size:14px;opacity:.75}

/* --- 渐变生成器 --- */
.gr-preview{height:160px;border-radius:var(--radius);border:1px solid var(--line);margin:0 0 16px}
.gr-stops{display:flex;flex-direction:column;gap:8px;flex:1 1 100%}
.gr-stop{display:flex;align-items:center;gap:10px}
.gr-stop input[type=color]{flex:0 0 44px;height:32px}
.gr-stop input[type=range]{flex:1 1 auto}
.gr-stop span{flex:0 0 46px;text-align:right;color:var(--muted)}

/* --- 色卡 --- */
.pal{margin:0 0 22px}
.pal h3{margin:0 0 2px}
.swatches{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:10px;margin-top:8px}
.sw{display:flex;flex-direction:column;gap:4px}
.sw-box{height:56px;border-radius:8px;border:1px solid var(--line);cursor:pointer;padding:0}
.sw-hex{font-size:12px;color:var(--fg);cursor:pointer}
.sw-rgb{font-size:11px;color:var(--muted);cursor:pointer;word-break:break-all}

/* --- 打靶 --- */
.sg-hud{display:flex;flex-wrap:wrap;gap:14px;font-size:14px;color:var(--muted);margin:0 0 10px}
.sg-hud strong{color:var(--fg)}
.sg-stage{position:relative;height:320px;border-radius:var(--radius);border:1px solid var(--line);
  overflow:hidden;background:var(--card);cursor:crosshair;touch-action:manipulation}
.sg-stage canvas{display:block}
.sg-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;
  justify-content:center;gap:10px;background:rgba(15,23,42,.55);color:#fff;text-align:center;padding:16px}
.sg-title{font-size:20px;font-weight:700}
.sg-desc{font-size:14px;opacity:.9}

@media (max-width:600px){
  h1{font-size:22px}
  .field label{min-width:100%}
  .field label.chk{min-width:0}
  main{padding:18px 16px 36px}
  .rt-stage{height:180px}
  .sg-stage{height:260px}
}