/* 万能工具站 · 原创设计系统 —— 干净现代，手机电脑都好用；无任何外部资源 */
*{box-sizing:border-box;margin:0;padding:0}
:root{
  --ink:#17172b;--muted:#6b7280;--line:#e8e9ef;--bg:#f6f7fb;--card:#fff;
  --brand:#4f46e5;--brand2:#7c3aed;--brand-soft:#eef2ff;
  --radius:16px;--shadow:0 1px 3px rgba(23,23,43,.06),0 8px 24px rgba(23,23,43,.06);
}
html{-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.65;font-size:15px}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
::selection{background:#c7d2fe}

/* 顶栏 */
.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.topbar-in{max-width:1240px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-mark{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-size:21px;font-weight:700;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px rgba(79,70,229,.35)}
.brand-name{font-size:19px;font-weight:800;letter-spacing:.5px}
.brand-tag{font-size:12px;color:var(--muted);background:var(--brand-soft);border-radius:20px;padding:3px 10px}
.search-box{margin-left:auto;position:relative;flex:1;max-width:420px;min-width:200px}
.search-box input{width:100%;padding:10px 38px 10px 16px;border:1.5px solid var(--line);border-radius:999px;font-size:14px;background:#f8f9fc;transition:border-color .15s,box-shadow .15s}
.search-box input:focus{outline:none;border-color:var(--brand);background:#fff;box-shadow:0 0 0 4px rgba(79,70,229,.12)}
.search-icon{position:absolute;right:13px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:17px;pointer-events:none}

/* 广告位：有广告时才显示，没广告不占地方 */
.ad-slot{max-width:1240px;margin:14px auto 0;padding:0 20px;text-align:center}
.ad-slot .ad-label{font-size:11px;color:#9ca3af}
.ad-home-top{margin-top:16px}
.ad-sidebar{margin:16px 0 0;padding:0}
.ad-home-mid{max-width:none;margin:18px 0 0;padding:0}
.ad-tool-top,.ad-tool-bottom{max-width:none;margin:0 0 16px;padding:0}
.ad-tool-bottom{margin:16px 0 0}

/* 布局 */
.layout{max-width:1240px;margin:0 auto;display:flex;align-items:flex-start}
.sidebar{width:236px;flex-shrink:0;padding:22px 14px 22px 20px;position:sticky;top:63px;max-height:calc(100vh - 63px);overflow:auto}
.side-cat{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:#374151;margin:18px 6px 6px}
.side-cat:first-child{margin-top:0}
.side-dot{width:9px;height:9px;border-radius:50%;flex-shrink:0}
.sidebar ul{list-style:none}
.sidebar li a{display:block;padding:7px 12px;border-radius:9px;color:#4b5563;font-size:14px}
.sidebar li a:hover{background:#eceef4;text-decoration:none;color:var(--ink)}
.sidebar li a.active{background:var(--brand-soft);color:var(--brand);font-weight:700}
.main{flex:1;padding:24px 20px 30px;min-width:0}
.hero{padding:14px 6px 22px}
.hero h1{font-size:30px;line-height:1.3;letter-spacing:.5px}
.hero h1 span{background:linear-gradient(90deg,var(--brand),var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--muted);margin-top:8px;font-size:15px}
.sec-title{display:flex;align-items:center;gap:9px;font-size:18px;margin:26px 2px 14px}
.sec-title:first-child{margin-top:0}
.sec-dot{width:26px;height:26px;border-radius:8px;color:#fff;font-size:12px;font-weight:700;display:inline-flex;align-items:center;justify-content:center}
.sec-count{font-size:12px;color:var(--muted);font-weight:400;background:#fff;border:1px solid var(--line);border-radius:20px;padding:2px 9px}

/* 工具卡片墙 */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:14px}
.tool-card{position:relative;display:flex;gap:13px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:17px 16px;color:var(--ink);box-shadow:0 1px 2px rgba(23,23,43,.04);transition:transform .15s,box-shadow .15s,border-color .15s}
.tool-card:hover{text-decoration:none;transform:translateY(-2px);box-shadow:var(--shadow);border-color:#c7d2fe}
.card-ico{width:44px;height:44px;border-radius:12px;color:#fff;font-size:14px;font-weight:800;display:flex;align-items:center;justify-content:center;flex-shrink:0;letter-spacing:.3px}
.card-body{min-width:0;flex:1}
.card-body b{display:block;font-size:15.5px;margin-bottom:3px}
.card-body span{font-size:13px;color:var(--muted);line-height:1.5;display:block}
.fav-btn{position:absolute;top:10px;right:10px;border:0;background:none;font-size:18px;color:#cbd5e1;cursor:pointer;padding:2px 6px;line-height:1}
.fav-btn:hover{color:#f59e0b}
.fav-btn.on{color:#f59e0b}
.fav-btn.big{position:static;font-size:15px;color:var(--brand);border:1.5px solid #c7d2fe;border-radius:999px;padding:8px 16px;white-space:nowrap}
.fav-btn.big.on{color:#b45309;border-color:#fcd34d;background:#fffbeb}

/* 面包屑 + 工具页 */
.crumb{font-size:13px;color:var(--muted);margin:2px 2px 14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:0 1px 2px rgba(23,23,43,.04)}
.card h1{font-size:23px;margin-bottom:6px;letter-spacing:.5px}
.desc{color:var(--muted);font-size:14.5px}
.tool-head{display:flex;justify-content:space-between;align-items:flex-start;gap:14px}
.usage{background:#f0f9ff;border:1px solid #bae6fd;border-radius:12px;padding:12px 15px;font-size:13.5px;color:#075985;margin:18px 0 6px;line-height:1.7}
.usage b{color:#0c4a6e}

/* 表单控件（全站统一） */
label{display:block;font-size:14px;font-weight:700;margin:16px 0 6px}
textarea,input[type=text],input[type=number],input[type=datetime-local],input[type=date],select{width:100%;padding:11px 13px;border:1.5px solid #d6d8e0;border-radius:11px;font-size:14.5px;font-family:inherit;background:#fff;transition:border-color .15s,box-shadow .15s}
textarea{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;min-height:130px;resize:vertical;line-height:1.6}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px rgba(79,70,229,.1)}
.row{display:flex;gap:12px;flex-wrap:wrap}
.row>*{flex:1;min-width:130px}
.btn{display:inline-block;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border:0;border-radius:11px;padding:11px 22px;font-size:14.5px;font-weight:700;cursor:pointer;margin:14px 8px 0 0;box-shadow:0 4px 14px rgba(79,70,229,.3);transition:filter .15s,transform .1s}
.btn:hover{filter:brightness(1.08)}
.btn:active{transform:scale(.98)}
.btn.gray{background:#e5e7eb;color:#374151;box-shadow:none}
.btn.green{background:linear-gradient(135deg,#059669,#10b981);box-shadow:0 4px 14px rgba(5,150,105,.3)}
.result-wrap{position:relative;margin-top:14px}
pre.out{background:#131328;color:#d7f9e3;border-radius:13px;padding:16px 46px 16px 16px;white-space:pre-wrap;word-break:break-all;font-size:13.5px;min-height:52px;font-family:ui-monospace,Menlo,Consolas,monospace;line-height:1.6;overflow:auto}
.copy-btn{position:absolute;top:8px;right:8px;border:0;background:rgba(255,255,255,.14);color:#e5e7eb;border-radius:8px;padding:5px 11px;font-size:12.5px;cursor:pointer}
.copy-btn:hover{background:rgba(255,255,255,.28);color:#fff}
.result{margin-top:14px;font-size:14.5px}
.result table{width:100%;border-collapse:collapse}
.result td,.result th{border:1px solid var(--line);padding:8px 12px;text-align:left;font-size:14px}
.result th{background:#f8f9fc;width:130px;font-weight:700}
.err{color:#dc2626;font-size:14px;margin-top:10px}
.ok{color:#059669;font-size:14px;margin-top:10px}
.checks label{display:inline-block;font-weight:400;margin:4px 16px 4px 0}
.checks input{width:auto;margin-right:5px}
.swatch{width:100%;height:66px;border-radius:12px;border:1px solid var(--line);margin-top:12px}
.md-preview{border:1.5px solid var(--line);border-radius:11px;padding:16px;margin-top:14px;min-height:90px}
.md-preview h1,.md-preview h2,.md-preview h3{margin:12px 0 6px}
.md-preview p{margin:9px 0}
.md-preview code{background:#f3f4f6;padding:2px 6px;border-radius:5px;font-size:13px}
.md-preview pre{background:#131328;color:#d7f9e3;padding:14px;border-radius:9px;overflow:auto}
.md-preview pre code{background:transparent;padding:0;color:inherit}
.md-preview ul,.md-preview ol{margin:9px 0 9px 24px}
.md-preview blockquote{border-left:3px solid #d1d5db;padding-left:13px;color:var(--muted);margin:9px 0}
.match{background:#fde68a;padding:0 2px;border-radius:3px}
.diff-add{background:#dcfce7;color:#166534}
.diff-del{background:#fee2e2;color:#991b1b;text-decoration:line-through}
.diff-line{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px;padding:3px 8px;white-space:pre-wrap;word-break:break-all;border-radius:4px}
.calc-keys{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:12px}
.calc-keys button{padding:13px 0;border:1.5px solid var(--line);background:#fff;border-radius:10px;font-size:16px;cursor:pointer}
.calc-keys button:hover{background:var(--brand-soft);border-color:#c7d2fe}
.calc-keys button.fn{background:#f8f9fc;font-size:14px}
.qr-box{text-align:center;margin-top:14px}
.qr-box canvas{border:1px solid var(--line);border-radius:12px;padding:10px;background:#fff;max-width:100%}
.footer{color:var(--muted);font-size:13px;text-align:center;padding:26px 20px 34px;line-height:1.8}
.empty-note{color:var(--muted);font-size:14px;padding:8px 2px}

.nav-toggle{display:none}

/* 手机适配 */
@media(max-width:820px){
  .topbar-in{padding:10px 14px;gap:10px}
  .brand-mark{width:34px;height:34px;font-size:19px;border-radius:10px}
  .brand-name{font-size:17px}
  .brand-tag{display:none}
  .search-box{max-width:none;order:3;flex-basis:100%;margin-left:0;min-width:0}
  .search-box input{font-size:16px;padding:9px 36px 9px 14px}
  .layout{flex-direction:column}
  .main{order:1;width:100%;padding:16px 14px 22px}
  .sidebar{display:none;width:100%;position:static;max-height:none;overflow:visible;padding:6px 14px 12px;background:#fff;border-bottom:1px solid var(--line)}
  .sidebar.open{display:block}
  .nav-toggle{display:flex;align-items:center;justify-content:center;width:38px;height:38px;margin-left:auto;border:1.5px solid var(--line);background:#fff;border-radius:10px;font-size:19px;line-height:1;color:var(--ink);cursor:pointer;flex-shrink:0}
  .side-cat{margin:12px 4px 6px;font-size:12.5px}
  .side-cat:first-child{margin-top:0}
  .sidebar ul{display:flex;flex-wrap:wrap;gap:6px;overflow:visible;padding-bottom:2px}
  .sidebar li{flex-shrink:0}
  .sidebar li a{white-space:nowrap;background:#f6f7fb;border:1px solid var(--line);border-radius:999px;padding:5px 11px;font-size:13px}
  .hero{padding:8px 2px 16px}
  .hero h1{font-size:22px}
  .hero p{font-size:14px}
  .sec-title{font-size:16.5px;margin:20px 2px 11px}
  .grid{grid-template-columns:1fr;gap:10px}
  .tool-card{padding:13px 14px;gap:11px;border-radius:13px}
  .card-ico{width:38px;height:38px;font-size:12px;border-radius:10px}
  .card-body b{font-size:15px}
  .card-body span{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
  .card{padding:18px 15px;border-radius:13px}
  .card h1{font-size:20px}
  .tool-head{flex-wrap:wrap}
  .usage{padding:10px 12px;font-size:13px;margin:14px 0 4px}
  textarea,input[type=text],input[type=number],input[type=datetime-local],input[type=date],select{font-size:16px;padding:10px 12px}
  textarea{min-height:110px}
  .btn{padding:10px 17px;font-size:14px;margin:10px 6px 0 0}
  pre.out{font-size:12.5px;padding:13px 40px 13px 13px}
  .result th{width:96px}
  .result td{word-break:break-all}
  .md-preview{padding:12px}
  .calc-keys{grid-template-columns:repeat(4,1fr);gap:7px}
  .calc-keys button{padding:11px 0}
  .footer{padding:20px 16px 28px}
}
.notice{background:#eff6ff;border:1px solid #bfdbfe;color:#1e40af;border-radius:12px;padding:12px 16px;margin:0 6px 6px;font-size:14.5px}