:root{--blue:#2563eb;--blue-d:#1d4ed8;--ink:#1e293b;--mut:#64748b;--line:#e2e8f0;--bg:#f8fafc;--card:#fff;--ok:#15803d;--warn:#b45309}
*{box-sizing:border-box}body{margin:0;font-family:-apple-system,"Segoe UI","Microsoft YaHei","PingFang SC",sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}
a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}
header.top{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.nav{max-width:1080px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.logo{font-size:20px;font-weight:800;color:var(--ink)}.logo span{color:var(--blue)}
.nav nav{display:flex;gap:14px;flex-wrap:wrap;font-size:15px}.nav nav a{color:var(--ink)}
main{max-width:1080px;margin:0 auto;padding:20px 16px 48px}
.hero{background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px 24px;margin-bottom:20px}
.hero h1{margin:0 0 8px;font-size:28px;line-height:1.3}.hero p{color:var(--mut);margin:6px 0}
.search{width:100%;max-width:520px;padding:12px 14px;font-size:16px;border:1px solid var(--line);border-radius:10px;margin-top:12px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px}
.card h2{margin:0 0 6px;font-size:19px}.card .ico{font-size:28px}.card p{color:var(--mut);margin:6px 0 14px;font-size:15px}
.btn{display:inline-block;background:var(--blue);color:#fff;border:0;border-radius:8px;padding:10px 18px;font-size:15px;cursor:pointer}
.btn:hover{background:var(--blue-d);text-decoration:none}.btn.sec{background:#e2e8f0;color:var(--ink)}.btn.sec:hover{background:#cbd5e1}
.btn:disabled{opacity:.5;cursor:not-allowed}
.tool{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px;margin-bottom:20px}
.tool h1{margin-top:0;font-size:24px}
label{display:block;font-weight:600;margin:14px 0 4px}
input[type=text],input[type=number],input[type=url],select,textarea{width:100%;padding:10px;border:1px solid var(--line);border-radius:8px;font-size:15px;font-family:inherit}
textarea{min-height:140px;resize:vertical}
input[type=file]{margin:8px 0}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:end}.row>*{flex:1;min-width:140px}
.muted{color:var(--mut);font-size:14px}.small{font-size:13px;color:var(--mut)}
.note{background:#eff6ff;border:1px solid #bfdbfe;border-radius:10px;padding:12px 14px;font-size:14px;margin:12px 0}
.warn{background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:12px 14px;font-size:14px;margin:12px 0}
table{width:100%;border-collapse:collapse;font-size:14px;margin-top:10px}th,td{border:1px solid var(--line);padding:8px;text-align:left;word-break:break-all}th{background:#f1f5f9}
.guide{background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px;margin-top:20px}.guide h2{font-size:20px}.guide h3{font-size:17px;margin-top:18px}
.ad-slot{max-width:728px;margin:16px auto}.ad-slot:empty{display:none}
footer{border-top:1px solid var(--line);background:#fff;padding:24px 16px;text-align:center;color:var(--mut);font-size:14px}
footer a{color:var(--mut);margin:0 8px}
.progress{height:8px;background:#e2e8f0;border-radius:4px;overflow:hidden;margin:8px 0}.progress>div{height:100%;background:var(--blue);width:0%}
.fileitem{display:flex;justify-content:space-between;gap:8px;padding:8px;border:1px solid var(--line);border-radius:8px;margin:6px 0;background:#fff;align-items:center;flex-wrap:wrap}
.fileitem button{cursor:pointer}
canvas.qr{border:1px solid var(--line);border-radius:8px}
pre.out{background:#f1f5f9;border-radius:8px;padding:12px;white-space:pre-wrap;word-break:break-word;font-size:14px;min-height:80px}
@media(max-width:640px){.hero h1{font-size:23px}.hero{padding:20px 16px}}
.drop{border:2px dashed #cbd5e1;border-radius:10px;padding:18px;text-align:center;color:var(--mut);margin-top:8px}
#preview{max-width:320px;width:100%;height:auto;border:1px solid var(--line);border-radius:8px;background:#f1f5f9;cursor:grab;touch-action:none;display:block}
.diff-line{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px;white-space:pre-wrap;word-break:break-all;padding:4px 8px;border-bottom:1px solid var(--line);display:flex;gap:8px}
.diff-line .ln{color:var(--mut);min-width:34px;text-align:right;flex:none}
.diff-line.add{background:#f0fdf4}.diff-line.del{background:#fef2f2}.diff-line .ch{background:#fde68a;border-radius:2px}
.hashgrid{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px;word-break:break-all;margin:8px 0}