:root{
  --bg:#f6f5f8;
  --card:#ffffff;
  --line:#e7e4ec;
  --text:#242029;
  --muted:#6d6875;
  --brand:#1971c2;
  --brand-d:#1864ab;
  --link:#1971c2;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.65;
  font-size:15px;
}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:960px;margin:0 auto;padding:0 16px}

/* header */
header.site{background:var(--card);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;height:56px}
.logo{font-size:18px;font-weight:700;color:var(--text)}
.logo:hover{text-decoration:none}
.logo span{color:var(--brand)}
.nav{margin-left:auto;display:flex;gap:18px;font-size:14px}
.nav a{color:var(--muted)}
.nav a:hover{color:var(--brand)}
@media(max-width:820px){.nav .catlink{display:none}}

/* breadcrumb */
.crumb{font-size:13px;color:var(--muted);padding:14px 0 2px}
.crumb a{color:var(--muted)}

/* headings */
h1{font-size:23px;margin:10px 0 6px}
h2{font-size:18px;margin:26px 0 10px;padding-bottom:6px;border-bottom:1px solid var(--line)}
.lead{color:var(--muted);margin:0 0 18px}

/* tool card */
.tool{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:18px;margin:14px 0}
textarea{
  width:100%;min-height:120px;resize:vertical;
  border:1px solid var(--line);border-radius:6px;padding:10px 12px;
  font-family:"SFMono-Regular",Consolas,"Microsoft YaHei",monospace;
  font-size:14px;line-height:1.6;color:var(--text);background:#fbfbfc;
}
textarea:focus{outline:none;border-color:var(--brand)}
.io-label{font-size:13px;color:var(--muted);margin:4px 0}
.opts{display:flex;flex-wrap:wrap;gap:14px 20px;align-items:center;margin:14px 0}
.opts label{font-size:14px;display:inline-flex;align-items:center;gap:6px;cursor:pointer}
.opts input[type=text],.opts input[type=number],.opts select{
  border:1px solid var(--line);border-radius:5px;padding:5px 8px;font-size:14px;font-family:inherit
}
.opts input[type=range]{accent-color:var(--brand);vertical-align:middle;max-width:170px}
.opts input[type=color]{width:44px;height:30px;border:1px solid var(--line);border-radius:5px;padding:2px;background:#fff;cursor:pointer;vertical-align:middle}
.opts b{color:var(--brand);display:inline-block;min-width:30px;text-align:right}
.btns{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0}
button{
  font-size:14px;padding:8px 18px;border-radius:6px;border:1px solid var(--brand);
  background:var(--brand);color:#fff;cursor:pointer;font-family:inherit;
}
button:hover{background:var(--brand-d);border-color:var(--brand-d)}
button.ghost{background:#fff;color:var(--text);border-color:var(--line)}
button.ghost:hover{background:#f2f0f4}
.stat{font-size:13px;color:var(--muted);margin-top:8px}
.toast{
  position:fixed;left:50%;bottom:40px;transform:translateX(-50%);
  background:#242029;color:#fff;padding:9px 18px;border-radius:6px;font-size:14px;
  opacity:0;pointer-events:none;transition:opacity .2s;z-index:50;
}
.toast.show{opacity:.94}

/* prose / SEO text */
.prose{color:#3c3743}
.prose p{margin:10px 0}
.prose ul{margin:10px 0;padding-left:22px}
.prose li{margin:4px 0}

/* 首页 Hero 渐变横幅（彩虹色，呼应配色主题） */
.herowrap{background:linear-gradient(115deg,#1971c2 0%,#e8590c 30%,#f59f00 48%,#37b24d 66%,#1c7ed6 82%,#7048e8 100%);color:#fff}
.herowrap .inner{max-width:1120px;margin:0 auto;padding:40px 16px 44px}
.herowrap h1{font-size:31px;margin:0 0 10px;color:#fff;letter-spacing:.5px;text-shadow:0 2px 12px rgba(0,0,0,.18)}
.herowrap .sub{margin:0 0 22px;color:rgba(255,255,255,.94);max-width:660px;font-size:15px;text-shadow:0 1px 6px rgba(0,0,0,.14)}
.searchbox{display:flex;max-width:540px;background:#fff;border-radius:12px;padding:5px;box-shadow:0 10px 30px rgba(0,0,0,.18)}
.searchbox input{flex:1;border:0;outline:0;padding:11px 16px;font-size:15px;background:transparent;color:var(--text);border-radius:10px}
.searchbox .sicon{display:flex;align-items:center;padding:0 4px 0 12px;color:var(--muted);font-size:16px}
.searchcount{font-size:13px;color:rgba(255,255,255,.9);margin-top:12px}
.searchcount b{color:#fff}

/* 顶部分类导航条 */
.topcats{background:rgba(255,255,255,.92);backdrop-filter:blur(6px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.topcats .bar{max-width:1120px;margin:0 auto;display:flex;flex-wrap:wrap;gap:8px;padding:11px 16px}
.topcats a{font-size:13px;color:var(--muted);white-space:nowrap;padding:5px 13px;border-radius:999px;background:var(--bg);border:1px solid var(--line);transition:.12s}
.topcats a:hover{color:#fff;background:var(--brand);border-color:var(--brand);text-decoration:none}

/* 首页两栏布局 */
.home-wrap{max-width:1120px;padding-top:6px}
.layout{display:flex;gap:26px;align-items:flex-start}
.side{width:158px;flex:0 0 158px;position:sticky;top:62px;align-self:flex-start}
.side .sidetitle{font-size:12px;color:var(--muted);padding:6px 10px;letter-spacing:.5px}
.side ul{list-style:none;margin:0;padding:0}
.side li{margin:1px 0}
.side a{display:flex;align-items:center;gap:8px;padding:7px 10px;border-radius:7px;color:#3c3743;font-size:14px}
.side a::before{content:"";width:8px;height:8px;border-radius:2px;background:var(--ac,#1971c2);flex:0 0 8px}
.side a:hover{background:#f6eef2;color:var(--brand);text-decoration:none}
.content{flex:1;min-width:0}

/* 分类区块 */
.cat{margin:8px 0 26px;scroll-margin-top:64px}
.cat h2{margin:14px 0 14px;font-size:18px;border:0;padding:0;display:flex;align-items:center;gap:10px}
.cat h2::before{content:"";width:4px;height:18px;border-radius:2px;background:var(--ac,#1971c2)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(206px,1fr));gap:13px}
.card{
  display:block;background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:14px 16px;color:var(--text);transition:transform .12s,box-shadow .12s,border-color .12s;
}
.card:hover{border-color:transparent;box-shadow:0 7px 20px rgba(30,42,54,.11);transform:translateY(-2px);text-decoration:none}
.card b{display:block;font-size:15px;margin-bottom:4px;padding-left:15px;position:relative;font-weight:600}
.card b::before{content:"";position:absolute;left:0;top:6px;width:8px;height:8px;border-radius:2px;background:var(--ac,#1971c2)}
.card small{color:var(--muted);font-size:12.5px;line-height:1.5;display:block;padding-left:15px}
.noresult{color:var(--muted);padding:30px 4px;display:none}
.grid.related{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;margin-top:6px}
.grid.related .card{padding:11px 14px}
.grid.related .card b{margin-bottom:0;font-size:14px}

@media(max-width:760px){.side{display:none}.layout{display:block}.home-wrap{max-width:960px}}
@media(max-width:600px){.herowrap h1{font-size:24px}.herowrap .inner{padding:30px 16px 34px}}

/* footer */
footer.site{border-top:1px solid var(--line);margin-top:40px;background:var(--card)}
footer.site a{color:var(--muted)}
.foot-main{max-width:1120px;margin:0 auto;padding:38px 16px 28px;display:grid;grid-template-columns:1.7fr 1.15fr 1.15fr;gap:30px 44px}
.foot-col{min-width:0}
.foot-about{max-width:440px}
.foot-logo{font-size:19px;font-weight:700;color:var(--text)}
.foot-logo span{color:var(--brand)}
.foot-about p{color:var(--muted);font-size:13px;margin:12px 0 0;line-height:1.8}
.foot-h{font-size:14px;font-weight:600;color:var(--text);margin-bottom:14px;position:relative;padding-left:11px}
.foot-h::before{content:"";position:absolute;left:0;top:3px;width:4px;height:14px;border-radius:2px;background:var(--brand)}
.foot-links{display:grid;grid-template-columns:repeat(2,minmax(72px,1fr));gap:10px 20px}
.foot-links a{color:var(--muted);font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.foot-links a:hover{color:var(--brand);text-decoration:none}
.foot-bar{border-top:1px solid var(--line);background:#fbfbfc}
.foot-bar .wrap{padding:16px 16px;color:var(--muted);font-size:13px;text-align:center;line-height:1.9}
.foot-bar .foot-line,.foot-bar .foot-copy{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:2px 10px}
.foot-bar .foot-copy{margin-top:8px;color:#948e9c;font-size:12.5px}
.foot-bar i{color:var(--line);font-style:normal}
.foot-bar a:hover{color:var(--brand);text-decoration:none}
@media(max-width:820px){
  .foot-main{grid-template-columns:1fr 1fr;gap:26px 40px}
  .foot-about{grid-column:1/-1;max-width:none}
}
@media(max-width:500px){
  .foot-main{grid-template-columns:1fr;gap:22px;padding:28px 16px 20px}
  .foot-links{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:600px){.nav{gap:12px}}

/* ===== 分类页彩色 Hero 横幅 ===== */
.cathero{background:linear-gradient(135deg,var(--hc,#1971c2) 0%,var(--hc,#1971c2) 60%,rgba(0,0,0,.14) 160%);color:#fff}
.cathero .wrap{padding:26px 16px 30px}
.cathero .crumb.light,.cathero .crumb.light a{color:rgba(255,255,255,.82)}
.cathero h1{color:#fff;font-size:26px;margin:8px 0 8px}
.cathero p{color:rgba(255,255,255,.9);margin:0;max-width:680px;font-size:14px;line-height:1.75}
.catcount{display:flex;align-items:baseline;gap:8px;border:0;padding:0;margin:22px 0 14px;font-size:19px}
.catcount span{font-size:13px;color:var(--muted);font-weight:400}

/* ===== FAQ ===== */
.faq{border:1px solid var(--line);border-radius:10px;overflow:hidden;margin:6px 0 4px;background:var(--card)}
.faq-q{position:relative;padding:13px 16px 13px 40px;font-weight:600;font-size:15px;color:var(--text);border-top:1px solid var(--line)}
.faq-q:first-child{border-top:0}
.faq-q::before{content:"Q";position:absolute;left:14px;top:12px;width:19px;height:19px;line-height:19px;text-align:center;font-size:12px;font-weight:700;color:#fff;background:var(--brand);border-radius:5px}
.faq-a{position:relative;padding:0 16px 14px 40px;color:#4c4753;font-size:14px;line-height:1.8}
.faq-a::before{content:"A";position:absolute;left:14px;top:1px;width:19px;height:19px;line-height:19px;text-align:center;font-size:12px;font-weight:700;color:var(--muted);background:#eeecf1;border-radius:5px}

/* ===== 名词自动内链 ===== */
a.tlink{color:inherit;border-bottom:1px dashed #cba3b6;cursor:help;text-decoration:none}
a.tlink:hover{color:var(--brand);border-bottom-color:var(--brand);text-decoration:none}

/* ===== 名词术语页 ===== */
.termbody p{margin:12px 0}
.termbody code{background:#eeecf1;border-radius:4px;padding:1px 5px;font-family:Consolas,"Microsoft YaHei",monospace;font-size:13px;color:#1971c2}
.termlinks{font-size:14px;line-height:2;color:var(--muted)}
.termlinks a{color:var(--brand)}
.termgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;margin:6px 0}
.tcard{display:block;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:11px 14px;color:var(--text);font-size:14px;transition:.12s}
.tcard:hover{border-color:var(--brand);color:var(--brand);text-decoration:none;box-shadow:0 5px 14px rgba(30,42,54,.08)}
.tcard b{font-weight:600}

/* ============ 颜色工具专用 ============ */
/* 棋盘格背景（透明色展示） */
.checker{background-image:linear-gradient(45deg,#e9e6ee 25%,transparent 25%),linear-gradient(-45deg,#e9e6ee 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#e9e6ee 75%),linear-gradient(-45deg,transparent 75%,#e9e6ee 75%);background-size:16px 16px;background-position:0 0,0 8px,8px -8px,-8px 0}

/* 大预览块 */
.bigprev{height:150px;border-radius:10px;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:600;margin:4px 0 8px;transition:background .15s}

/* 颜色输入组（色盘 + hex 文本） */
.cinput{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:10px 0}
.cinput input[type=color]{width:52px;height:38px;border:1px solid var(--line);border-radius:7px;padding:2px;background:#fff;cursor:pointer}
.cinput input[type=text]{border:1px solid var(--line);border-radius:6px;padding:8px 11px;font-size:15px;font-family:Consolas,monospace;width:130px}
.cinput input[type=text]:focus{outline:none;border-color:var(--brand)}

/* 数值输出行 */
.vals{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;margin:12px 0}
.vrow{border:1px solid var(--line);border-radius:8px;padding:9px 12px;background:var(--card);cursor:pointer;transition:.12s}
.vrow:hover{border-color:var(--brand);box-shadow:0 4px 12px rgba(30,42,54,.07)}
.vrow .k{font-size:12px;color:var(--muted);display:block}
.vrow .v{font-size:15px;font-weight:600;font-family:Consolas,monospace;word-break:break-all}

/* 色块（配色/调色板） */
.swrow{display:flex;flex-wrap:wrap;gap:0;border-radius:10px;overflow:hidden;border:1px solid var(--line);margin:12px 0}
.sw{flex:1 1 0;min-width:60px;height:96px;display:flex;align-items:flex-end;justify-content:center;padding-bottom:8px;cursor:pointer;position:relative;transition:.12s}
.sw:hover{transform:scale(1.03);z-index:2;box-shadow:0 6px 18px rgba(0,0,0,.16)}
.sw span{font-size:12px;font-family:Consolas,monospace;background:rgba(255,255,255,.86);color:#242029;padding:2px 6px;border-radius:4px}
.swgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:10px;margin:12px 0}
.swgrid .cell{border-radius:8px;overflow:hidden;border:1px solid var(--line);cursor:pointer;background:var(--card);transition:.12s}
.swgrid .cell:hover{transform:translateY(-2px);box-shadow:0 6px 16px rgba(0,0,0,.12)}
.swgrid .cell .box{height:60px}
.swgrid .cell .cap{font-size:11.5px;font-family:Consolas,monospace;text-align:center;padding:5px 2px;color:#3c3743;word-break:break-all}
.swgrid .cell .cap em{display:block;font-style:normal;color:var(--muted);font-size:11px}

/* CSS 代码输出框 */
.cssout{background:#2b2733;color:#e8e4ef;border-radius:8px;padding:12px 14px;font-family:Consolas,monospace;font-size:13px;line-height:1.7;overflow-x:auto;white-space:pre;margin:10px 0}

/* 结果盒（对比度等） */
.rbox{margin-top:14px;padding:15px 18px;background:#fbeef3;border:1px solid #f2d3e0;border-radius:8px;font-size:15px;line-height:1.9;display:none}
.rbox.show{display:block}
.rbox b{color:var(--brand);font-size:19px}
.rbox .sub{font-size:13px;color:var(--muted)}
.badge{display:inline-block;font-size:12px;font-weight:600;padding:2px 9px;border-radius:999px;margin-left:6px}
.badge.pass{background:#d3f9d8;color:#2b8a3e}
.badge.fail{background:#ffe3e3;color:#c92a2a}

/* 上传区 */
.drop{border:2px dashed var(--line);border-radius:10px;padding:26px;text-align:center;color:var(--muted);cursor:pointer;transition:.12s;background:#fbfbfc}
.drop:hover,.drop.drag{border-color:var(--brand);background:#fbeef3;color:var(--brand)}
.canvaswrap{position:relative;margin:12px 0;max-width:100%;overflow:auto}
.canvaswrap canvas{max-width:100%;border:1px solid var(--line);border-radius:8px;cursor:crosshair;display:block}

@media(max-width:600px){
  .sw{height:78px}
  .bigprev{height:120px}
}

/* ============ SEO 站长工具专用 ============ */
.mform{display:grid;gap:10px;margin:10px 0}
.mform label{display:flex;align-items:center;gap:10px;font-size:14px}
.mform label span{width:150px;flex:0 0 150px;color:var(--muted);text-align:right}
.mform input[type=text]{flex:1;border:1px solid var(--line);border-radius:6px;padding:7px 10px;font-size:14px;font-family:inherit}
.mform input[type=text]:focus{outline:none;border-color:var(--brand)}
@media(max-width:600px){.mform label{flex-wrap:wrap}.mform label span{width:auto;flex:0 0 auto;text-align:left}}
.serp{border:1px solid var(--line);border-radius:8px;padding:16px;background:#fff;margin:12px 0;max-width:600px}
.serp .s-title{color:#1a0dab;font-size:19px;line-height:1.3;margin-bottom:3px}
.serp .s-url{color:#0b7a34;font-size:13px;margin-bottom:4px;word-break:break-all}
.serp .s-desc{color:#4d5156;font-size:14px;line-height:1.55}
.counter{display:flex;gap:12px;flex-wrap:wrap;margin:12px 0}
.counter .box{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:11px 16px;text-align:center;min-width:82px}
.counter .box b{display:block;font-size:23px;color:var(--brand);line-height:1.2}
.counter .box span{font-size:12px;color:var(--muted)}
.len-ok{color:#2b8a3e!important}
.len-warn{color:#e8590c!important}
.datatable{width:100%;border-collapse:collapse;font-size:14px;margin:10px 0}
.datatable th,.datatable td{border:1px solid var(--line);padding:6px 10px;text-align:left}
.datatable th{background:#e7f0fb;color:var(--brand);white-space:nowrap}
.datatable td:first-child{font-family:Consolas,monospace}

/* 文本对比 */
.diffcols{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:10px 0}
.diffcols textarea{min-height:150px}
@media(max-width:600px){.diffcols{grid-template-columns:1fr}}
.diffout{border:1px solid var(--line);border-radius:8px;overflow:auto;max-height:520px;margin:6px 0;background:#fbfbfc;font-family:"SFMono-Regular",Consolas,"Microsoft YaHei",monospace;font-size:13px;line-height:1.7}
.diffout:empty{display:none}
.dl{padding:1px 12px;white-space:pre-wrap;word-break:break-all;border-left:3px solid transparent}
.dl.eq{color:#6d6875}
.dl.add{background:#e6f6ea;color:#227a38;border-left-color:#37b24d}
.dl.del{background:#fdecec;color:#c02b2b;border-left-color:#e03131}

/* Markdown 预览 */
.md-preview{border:1px solid var(--line);border-radius:8px;padding:14px 18px;background:#fff;min-height:80px;line-height:1.75;color:var(--text);overflow-x:auto}
.md-preview:empty{display:none}
.md-preview h1,.md-preview h2,.md-preview h3{border:0;padding:0;margin:14px 0 8px}
.md-preview h1{font-size:22px}.md-preview h2{font-size:19px}.md-preview h3{font-size:16px}
.md-preview p{margin:8px 0}
.md-preview ul,.md-preview ol{margin:8px 0;padding-left:24px}
.md-preview code{background:#eef1f5;border-radius:4px;padding:1px 6px;font-family:Consolas,monospace;font-size:13px;color:#c7254e}
.md-preview pre{background:#2b2733;color:#e8e4ef;border-radius:8px;padding:12px 14px;overflow-x:auto}
.md-preview pre code{background:none;color:inherit;padding:0}
.md-preview blockquote{margin:8px 0;padding:2px 14px;border-left:4px solid var(--line);color:var(--muted)}
.md-preview a{color:var(--link)}
.md-preview table{border-collapse:collapse;margin:8px 0}
.md-preview th,.md-preview td{border:1px solid var(--line);padding:5px 10px}