:root{
  --bg:#f6f7fb;--card:#fff;--text:#171923;--muted:#6b7280;--line:#e7e9ef;
  --accent:#5b5ce2;--accent2:#7778ee;--soft:#eef0ff;--shadow:0 12px 35px rgba(25,30,60,.08)
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text)}
a{text-decoration:none;color:inherit}.container{width:min(1120px,calc(100% - 32px));margin:auto}
.site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--card) 88%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{height:68px;display:flex;align-items:center;gap:28px}.brand{font-weight:800;font-size:20px;display:flex;align-items:center;gap:9px}.brand-icon{font-size:25px}.nav-links{display:flex;gap:22px;margin-left:auto;color:var(--muted);font-size:14px}.nav-links a:hover{color:var(--accent)}
.language-select{border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:10px;padding:9px 28px 9px 10px;font-size:13px;cursor:pointer}.icon-btn{border:1px solid var(--line);background:var(--card);border-radius:12px;width:40px;height:40px;cursor:pointer;font-size:17px}
.hero{background:radial-gradient(circle at 50% -20%,#dfe2ff 0,transparent 50%),var(--card);border-bottom:1px solid var(--line);padding:72px 0 55px;text-align:center}
.eyebrow{display:inline-block;background:var(--soft);color:var(--accent);padding:7px 13px;border-radius:99px;font-size:13px;font-weight:700;margin-bottom:18px}
.hero h1{font-size:clamp(36px,6vw,64px);line-height:1.1;margin:0;letter-spacing:-2px}.hero h1 span{color:var(--accent)}.hero p{color:var(--muted);font-size:17px;margin:18px 0 28px}
.search-wrap{max-width:700px;margin:auto;display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:7px 12px 7px 18px;box-shadow:var(--shadow)}
.search-wrap>span{font-size:26px;color:var(--muted)}.search-wrap input{flex:1;border:0;outline:0;background:transparent;color:var(--text);font-size:16px;min-width:0}.search-wrap kbd{font-size:11px;color:var(--muted);border:1px solid var(--line);padding:4px 7px;border-radius:6px}
.quick-tags{margin-top:14px;display:flex;justify-content:center;gap:8px;flex-wrap:wrap}.quick-tags button{border:0;background:transparent;color:var(--muted);cursor:pointer;padding:6px 10px}.quick-tags button:hover{color:var(--accent)}
.content{padding:48px 0}.tool-section{margin-bottom:55px;scroll-margin-top:90px}.section-title{margin-bottom:20px}.section-title>div{display:flex;align-items:center;gap:14px}.section-icon{font-size:27px}.section-title h2{margin:0;font-size:24px}.section-title p{margin:5px 0 0;color:var(--muted);font-size:13px}
.tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.tool-card{background:var(--card);border:1px solid var(--line);border-radius:17px;padding:21px;min-height:150px;transition:.2s;box-shadow:0 4px 14px rgba(25,30,60,.03)}
.tool-card:hover{transform:translateY(-3px);border-color:#cfd1ff;box-shadow:var(--shadow)}.tool-card>span{font-size:26px;display:block;margin-bottom:13px}.tool-card h3{margin:0 0 7px;font-size:16px}.tool-card p{margin:0;color:var(--muted);font-size:13px;line-height:1.5}
.search-result{margin-bottom:40px}.search-result h2{font-size:22px}.search-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.hidden{display:none!important}footer{border-top:1px solid var(--line);background:var(--card);color:var(--muted);font-size:13px}.footer-inner{min-height:90px;display:flex;align-items:center;justify-content:space-between}
.modal{position:fixed;inset:0;z-index:50;display:grid;place-items:center;padding:18px}.modal-backdrop{position:absolute;inset:0;background:rgba(10,12,25,.5);backdrop-filter:blur(3px)}.modal-box{position:relative;width:min(760px,100%);max-height:90vh;overflow:auto;background:var(--card);border-radius:22px;padding:30px;box-shadow:0 25px 80px rgba(0,0,0,.25)}.modal-close{position:absolute;right:15px;top:12px;border:0;background:transparent;font-size:30px;color:var(--muted);cursor:pointer}.modal-box h2{margin:0 0 8px}.modal-box .hint{color:var(--muted);font-size:13px;margin-bottom:18px}.tool-ui{display:grid;gap:14px}.tool-ui textarea,.tool-ui input,.tool-ui select{width:100%;padding:12px 13px;border:1px solid var(--line);border-radius:11px;background:var(--bg);color:var(--text);font:inherit}.tool-ui textarea{min-height:180px;resize:vertical}.row{display:flex;gap:10px;flex-wrap:wrap}.btn{border:0;background:var(--accent);color:white;padding:11px 16px;border-radius:10px;cursor:pointer;font-weight:700}.btn.secondary{background:var(--soft);color:var(--accent)}.output{padding:13px;border:1px dashed var(--line);border-radius:11px;background:var(--bg);white-space:pre-wrap;overflow:auto}.drop{border:2px dashed var(--line);padding:35px;text-align:center;border-radius:14px;cursor:pointer}.drop:hover{border-color:var(--accent)}.preview{max-width:100%;max-height:330px;display:block;margin:10px auto;border-radius:10px}.qr{width:220px;height:220px;object-fit:contain;margin:auto;display:block}
body.dark{--bg:#101116;--card:#181a21;--text:#f2f3f7;--muted:#9da2b1;--line:#2b2e39;--soft:#25284a;--accent:#8586ff;--accent2:#999aff;--shadow:0 15px 45px rgba(0,0,0,.25)}
@media(max-width:850px){.tool-grid,.search-grid{grid-template-columns:repeat(2,1fr)}.nav-links{display:none}.language-select{margin-left:auto}}
@media(max-width:520px){.container{width:min(100% - 22px,1120px)}.hero{padding:50px 0 38px}.hero h1{letter-spacing:-1px}.search-wrap kbd{display:none}.tool-grid,.search-grid{grid-template-columns:1fr 1fr;gap:10px}.tool-card{padding:16px;min-height:145px}.tool-card h3{font-size:15px}.footer-inner{flex-direction:column;justify-content:center;gap:7px}}