:root{--bg:#0f172a;--card:#fff;--ink:#1e293b;--muted:#64748b;--line:#e2e8f0;--accent:#2563eb;--accent-2:#1d4ed8;--soft:#f8fafc;--radius:14px}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;background:#eef2f7;color:var(--ink);line-height:1.5}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.site-header{background:var(--bg);color:#fff;padding:14px 0}
.site-header .wrap{display:flex;align-items:center;gap:22px;flex-wrap:wrap}
.brand{color:#fff;font-weight:700;font-size:18px}
.brand span{color:#60a5fa}
.site-header nav{display:flex;gap:16px;flex-wrap:wrap}
.site-header nav a{color:#cbd5e1;font-size:14px}
.site-header nav a:hover{color:#fff;text-decoration:none}
.site-header nav a.active{color:#fff;border-bottom:2px solid #60a5fa;padding-bottom:2px}
.wrap{max-width:980px;margin:0 auto;padding:0 18px}
.hero{padding:32px 0 8px}
.hero h1{margin:0 0 8px;font-size:28px;line-height:1.2}
.hero p{margin:0;color:var(--muted);font-size:15.5px;max-width:780px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;margin:20px 0;box-shadow:0 4px 18px rgba(15,23,42,.05)}
.card h2{margin:0 0 6px;font-size:19px}
.card .sub{color:var(--muted);font-size:14px;margin:0 0 14px}
textarea{width:100%;min-height:170px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13.5px;line-height:1.5;padding:12px 14px;border:1px solid var(--line);border-radius:10px;resize:vertical;outline:none;background:#fff;color:var(--ink)}
textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
input[type=text],input[type=number],select{font:inherit;font-size:14px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);outline:none;max-width:100%}
input:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:12px}
button{font:inherit;font-size:14px;font-weight:600;border:1px solid transparent;border-radius:10px;padding:10px 16px;cursor:pointer;background:var(--accent);color:#fff;transition:.15s}
button:hover{background:var(--accent-2)}
button.ghost{background:#fff;color:var(--ink);border-color:var(--line)}
button.ghost:hover{background:var(--soft)}
.count{margin-left:auto;color:var(--muted);font-size:13px}
.result{margin-top:16px;border:1px solid var(--line);border-radius:12px;overflow:auto;max-height:440px;background:var(--soft)}
.result-head{position:sticky;top:0;z-index:2;display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:10px 14px;background:#fff;border-bottom:1px solid var(--line)}
.result-head strong{font-size:14px}
.result-head .btns{margin-left:auto;display:flex;gap:8px;flex-wrap:wrap}
.result-head button{padding:8px 13px;font-size:13px}
.result pre{margin:0;padding:14px;white-space:pre-wrap;word-break:break-word;font-family:ui-monospace,Consolas,monospace;font-size:13px}
.err{color:#b91c1c;font-size:14px;margin-top:10px;min-height:20px}
.ok{color:#15803d}
.muted{color:var(--muted);font-size:14px}
table{width:100%;border-collapse:collapse;font-size:15px}
th,td{text-align:left;padding:11px 8px;border-bottom:1px solid var(--line);vertical-align:top}
th{color:var(--muted);font-weight:500;font-size:12.5px;text-transform:uppercase;letter-spacing:.4px}
tr:last-child td{border-bottom:0}
td.sz{white-space:nowrap;color:var(--muted)}
code{background:#f1f5f9;padding:2px 6px;border-radius:5px;font-size:13px;font-family:ui-monospace,Consolas,monospace}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.metric{background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:18px 14px;text-align:center}
.metric .v{font-size:28px;font-weight:700;font-variant-numeric:tabular-nums;word-break:break-all}
.metric .l{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;margin-top:4px}
.foot{margin:8px 0 44px;color:var(--muted);font-size:14px;display:flex;gap:18px;flex-wrap:wrap}
#toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(20px);background:#0f172a;color:#fff;padding:11px 18px;border-radius:10px;font-size:14px;opacity:0;pointer-events:none;transition:.25s;z-index:50}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@media (max-width:640px){.hero h1{font-size:23px}.card{padding:16px}.grid3{grid-template-columns:1fr}.count{margin-left:0}}