:root{
  --bg:#f7f8fa; --card:#ffffff; --text:#1f2329; --muted:#646a73;
  --primary:#2f6bff; --primary-soft:#eaf0ff; --border:#e5e6eb;
  --red:#d83931; --green:#00a854; --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box;font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;}
body{background:var(--bg);color:var(--text);line-height:1.6;font-size:15px;}
a{text-decoration:none;color:inherit;}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px;}

header{background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50;}
.nav{display:flex;align-items:center;justify-content:space-between;height:58px;}
.logo{font-size:19px;font-weight:700;color:var(--primary);}
.nav-links{display:flex;gap:22px;font-size:14px;color:var(--muted);}
.nav-links a:hover{color:var(--primary);}
.nav-links a.on{color:var(--primary);font-weight:600;}

.hero{text-align:center;padding:44px 0 30px;}
.hero h1{font-size:30px;margin-bottom:10px;}
.hero h1 span{color:var(--primary);}
.hero p{color:var(--muted);font-size:15px;}

section{padding:22px 0;}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:16px;}
.sec-head h2{font-size:20px;}
.sec-head a{font-size:13px;color:var(--primary);}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(235px,1fr));gap:13px;}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;transition:.15s;display:block;}
.card:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:0 6px 18px rgba(47,107,255,.10);}
.card .icon{font-size:24px;}
.card h3{font-size:15px;margin:8px 0 4px;}
.card p{font-size:12.5px;color:var(--muted);}
.tag{display:inline-block;margin-top:10px;font-size:11px;color:var(--red);background:#fdeceb;border-radius:4px;padding:1px 6px;}
.tag.gray{color:var(--muted);background:#f0f1f3;}

/* 工具页 */
.tool-page{padding:26px 0 40px;}
.tool-page h1{font-size:22px;margin-bottom:6px;}
.tool-page .desc{color:var(--muted);font-size:14px;margin-bottom:18px;}
.panel{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px;margin-bottom:16px;}
.panel h2{font-size:16px;margin-bottom:14px;}
.drop{border:2px dashed var(--border);border-radius:12px;padding:34px 20px;text-align:center;color:var(--muted);cursor:pointer;transition:.15s;background:#fafbfc;}
.drop:hover,.drop.over{border-color:var(--primary);color:var(--primary);background:var(--primary-soft);}
.drop input{display:none;}
.file-list{font-size:13px;color:var(--text);margin-top:12px;}
.file-list .f{padding:6px 10px;background:#f0f4ff;border-radius:8px;margin-bottom:6px;display:flex;justify-content:space-between;}
.file-list .f button{background:none;border:none;color:var(--red);cursor:pointer;font-size:13px;}

.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin:12px 0;}
.row label{font-size:13px;color:var(--muted);white-space:nowrap;}
input[type=text],input[type=number],select{height:38px;border:1px solid var(--border);border-radius:8px;padding:0 10px;font-size:14px;outline:none;background:#fff;color:var(--text);}
input:focus,select:focus{border-color:var(--primary);}
input[type=text]{flex:1;min-width:160px;}
input[type=range]{flex:1;min-width:120px;}
.picker{display:flex;gap:8px;flex-wrap:wrap;}
.picker select{height:38px;border:1px solid var(--border);border-radius:8px;padding:0 8px;font-size:14px;outline:none;background:#fff;color:var(--text);}
.btn{display:inline-block;background:var(--primary);color:#fff;border:none;border-radius:10px;padding:11px 26px;font-size:14px;cursor:pointer;}
.btn:hover{opacity:.9;}
.btn.ghost{background:var(--primary-soft);color:var(--primary);}
.btn:disabled{opacity:.5;cursor:not-allowed;}
.hint{font-size:12px;color:var(--muted);margin-top:8px;}
.result{display:none;background:#f0faf2;border:1px solid #bfe8c8;border-radius:10px;padding:14px 16px;margin-top:14px;font-size:14px;word-break:break-all;}
.result.ok{display:block;}
.result .dl{display:inline-block;margin-top:8px;color:var(--primary);font-weight:600;}
.pbar{height:6px;background:#eef1f5;border-radius:99px;overflow:hidden;margin-top:12px;display:none;}
.pbar.on{display:block;}
.pbar i{display:block;height:100%;width:0;background:var(--primary);transition:width .2s;}

.tabs{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap;}
.tabs button{padding:8px 16px;border:1px solid var(--border);background:#fff;border-radius:999px;font-size:13px;cursor:pointer;color:var(--muted);}
.tabs button.on{background:var(--primary);border-color:var(--primary);color:#fff;}
.tab-panel{display:none;}
.tab-panel.on{display:block;}
textarea{width:100%;min-height:120px;border:1px solid var(--border);border-radius:10px;padding:10px;font-size:14px;resize:vertical;outline:none;font-family:inherit;}
table{border-collapse:collapse;width:100%;font-size:13px;margin-top:8px;}
th,td{border:1px solid var(--border);padding:7px 8px;text-align:right;}
th{background:#f5f7fa;font-weight:600;color:var(--muted);}
.kv{display:grid;grid-template-columns:auto 1fr;gap:10px 14px;font-size:14px;margin-top:10px;}
.kv b{font-weight:600;}

footer{border-top:1px solid var(--border);margin-top:30px;padding:28px 0 64px;color:var(--muted);font-size:13px;text-align:center;line-height:2;}
@media(max-width:640px){.nav-links{display:none;}.hero h1{font-size:24px;}}