:root{
  --brand:#1e9fff;
  --brand-d:#1681d6;
  --ink:#333;
  --gray:#888;
  --line:#e8e8e8;
  --bg:#f5f7fa;
  --card:#fff;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;color:var(--ink);background:var(--bg);font-size:14px;line-height:1.7}
a{color:inherit;text-decoration:none}
a:hover{color:var(--brand)}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 16px}

/* 顶部导航 */
.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:100;box-shadow:0 1px 6px rgba(0,0,0,.04)}
.topbar .container{display:flex;align-items:center;height:60px;gap:24px}
.logo{font-size:22px;font-weight:700;color:var(--brand);white-space:nowrap}
.logo small{display:block;font-size:11px;color:var(--gray);font-weight:400}
.nav{display:flex;gap:4px;flex:1;flex-wrap:wrap}
.nav a{padding:6px 12px;border-radius:4px;font-size:15px;white-space:nowrap}
.nav a:hover,.nav a.on{background:var(--brand);color:#fff}
.searchbox{display:flex;align-items:center}
.searchbox input{width:180px;height:34px;border:1px solid var(--line);border-radius:4px 0 0 4px;padding:0 10px;outline:none}
.searchbox input:focus{border-color:var(--brand)}
.searchbox button{height:34px;border:none;background:var(--brand);color:#fff;padding:0 14px;border-radius:0 4px 4px 0;cursor:pointer}

/* 首页时钟 */
.hero{background:linear-gradient(135deg,#1e9fff 0%,#36cfc9 100%);color:#fff;padding:46px 0 54px;text-align:center}
.hero h1{font-size:30px;font-weight:700;margin-bottom:6px}
.hero .sub{opacity:.92;margin-bottom:24px;font-size:15px}
.clock{font-variant-numeric:tabular-nums;letter-spacing:2px}
.clock .hm{font-size:72px;font-weight:700;line-height:1.1}
.clock .sec{font-size:34px;font-weight:600;opacity:.9}
.clock .colon{opacity:.7}
.clock .date{margin-top:14px;font-size:17px;opacity:.95}
.clock .meta{margin-top:16px;font-size:13px;opacity:.85;display:flex;gap:22px;justify-content:center;flex-wrap:wrap}
.hero .quick{margin-top:26px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.hero .quick a{background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.35);padding:8px 18px;border-radius:30px;font-size:14px}
.hero .quick a:hover{background:#fff;color:var(--brand)}

/* 区块标题 */
.section{padding:34px 0 8px}
.sec-hd{display:flex;align-items:baseline;gap:12px;margin-bottom:18px;border-bottom:2px solid var(--line);padding-bottom:8px}
.sec-hd h2{font-size:21px;color:var(--ink);position:relative;padding-left:12px}
.sec-hd h2:before{content:"";position:absolute;left:0;top:4px;bottom:4px;width:4px;background:var(--brand);border-radius:2px}
.sec-hd .more{margin-left:auto;color:var(--gray);font-size:13px}

/* 工具网格 */
.grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
.tool-card{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:16px 14px;transition:.15s;display:flex;gap:12px;align-items:flex-start}
.tool-card:hover{box-shadow:0 6px 18px rgba(30,159,255,.14);border-color:var(--brand);transform:translateY(-2px)}
.tool-card .ico{width:40px;height:40px;flex:0 0 40px;border-radius:8px;background:linear-gradient(135deg,#1e9fff,#36cfc9);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700}
.tool-card h3{font-size:15px;margin-bottom:4px}
.tool-card p{color:var(--gray);font-size:12.5px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* 分类页 */
.cat-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0 6px}
.cat-tabs a{background:#fff;border:1px solid var(--line);padding:6px 16px;border-radius:20px;font-size:14px}
.cat-tabs a.on,.cat-tabs a:hover{background:var(--brand);color:#fff;border-color:var(--brand)}

/* 工具详情 */
.tool-wrap{background:#fff;border:1px solid var(--line);border-radius:10px;padding:26px;margin:22px 0}
.tool-wrap h1{font-size:24px;margin-bottom:4px}
.tool-wrap .tdesc{color:var(--gray);margin-bottom:20px}
.tool-app{border:1px dashed var(--line);border-radius:8px;padding:24px;background:#fafcff;min-height:180px}
.tool-app label{font-weight:600;display:block;margin:12px 0 6px}
.tool-app textarea,.tool-app input[type=text],.tool-app select,.tool-app input[type=number],.tool-app input[type=password]{
  width:100%;border:1px solid var(--line);border-radius:6px;padding:10px 12px;font-size:14px;font-family:inherit;outline:none}
.tool-app textarea{min-height:120px;resize:vertical}
.tool-app textarea:focus,.tool-app input:focus{border-color:var(--brand)}
.btn{display:inline-block;background:var(--brand);color:#fff;border:none;padding:9px 22px;border-radius:6px;font-size:14px;cursor:pointer;margin:10px 8px 0 0}
.btn:hover{background:var(--brand-d);color:#fff}
.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.out{margin-top:16px}
.out textarea,.out pre{background:#0f172a;color:#e2e8f0;border-radius:6px;padding:12px;min-height:60px;white-space:pre-wrap;word-break:break-all;font-size:13px}
.tool-info{margin-top:26px;border-top:1px solid var(--line);padding-top:18px;color:#555}
.tool-info h3{margin:14px 0 6px;font-size:16px}
.crumbs{font-size:13px;color:var(--gray);padding:16px 0 0}
.crumbs a{color:var(--gray)}
.crumbs a:hover{color:var(--brand)}

/* 文章 */
.post{background:#fff;border:1px solid var(--line);border-radius:8px;padding:16px 20px;margin-bottom:12px;display:flex;justify-content:space-between;gap:16px}
.post h3{font-size:16px}
.post .date{color:var(--gray);font-size:13px;white-space:nowrap}
.article{background:#fff;border:1px solid var(--line);border-radius:10px;padding:32px;margin:22px 0;line-height:2;font-size:15.5px}
.article h1{margin-bottom:10px}
.article .meta{color:var(--gray);font-size:13px;border-bottom:1px solid var(--line);padding-bottom:14px;margin-bottom:20px}
.article p{margin:12px 0}

/* 关于 */
.about{background:#fff;border:1px solid var(--line);border-radius:10px;padding:30px;margin:22px 0;line-height:2.1;color:#555}
.about h3{margin:16px 0 6px;color:var(--ink)}

/* 页脚 */
footer{background:#fff;border-top:1px solid var(--line);margin-top:50px;padding:28px 0;text-align:center;color:var(--gray);font-size:13px}
footer a{color:var(--gray)}
footer .flinks{margin-bottom:8px;display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

.empty{background:#fff;border:1px dashed var(--line);border-radius:8px;padding:50px;text-align:center;color:var(--gray)}

@media(max-width:900px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .grid.cols-4{grid-template-columns:repeat(2,1fr)}
  .nav{order:3;width:100%}
  .topbar .container{height:auto;flex-wrap:wrap;padding:8px 16px;gap:10px}
  .clock .hm{font-size:52px}
}