:root{
  --bg:#f5f7fb;
  --surface:#ffffff;
  --surface-2:#f8fbff;
  --text:#10203b;
  --muted:#64748b;
  --line:#dbe4f1;
  --shadow:0 24px 60px rgba(16,32,59,.10), 0 10px 26px rgba(16,32,59,.06);
  --radius:24px;
  --primary:#1d4ed8;
  --accent:#f59e0b;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:linear-gradient(180deg,#f8fbff 0%,#f3f6fb 100%);color:var(--text)}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.shell{min-height:100svh;display:flex;flex-direction:column}
.topbar{position:sticky;top:0;z-index:30;backdrop-filter:blur(18px);background:rgba(250,252,255,.82);border-bottom:1px solid rgba(219,228,241,.8)}
.topbar-inner{max-width:1180px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:16px 20px}
.brand{display:flex;align-items:center;gap:14px;font-weight:800}
.brand img{width:48px;height:48px;object-fit:cover;border-radius:14px;box-shadow:0 8px 18px rgba(16,32,59,.14)}
.brand small{display:block;font-size:12px;color:var(--muted);font-weight:600}
.back-link{padding:12px 16px;border-radius:16px;background:#fff;border:1px solid var(--line);box-shadow:0 8px 18px rgba(16,32,59,.06);font-weight:700}
.container{max-width:1180px;margin:0 auto;padding:30px 20px 70px}
.utility-hero{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:stretch}
.panel{background:rgba(255,255,255,.82);border:1px solid rgba(219,228,241,.9);box-shadow:var(--shadow);border-radius:28px}
.headline{padding:28px}
.kicker{display:inline-flex;align-items:center;gap:10px;padding:10px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13px;font-weight:800;color:#35507a}
.headline h1{margin:18px 0 10px;font-size:clamp(34px,4vw,60px);line-height:.98;letter-spacing:-.045em}
.headline p{font-size:18px;color:#5f718e;max-width:62ch;line-height:1.65}
.meta{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}
.tag{padding:10px 14px;border-radius:999px;border:1px solid var(--line);background:#fff;color:#29405f;font-weight:700;font-size:13px}
.preview-box{min-height:320px;padding:16px;display:flex}
.preview-box img{width:100%;height:100%;object-fit:cover;border-radius:22px;border:1px solid #e2e8f0}
.workspace{margin-top:24px;padding:22px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.card{background:linear-gradient(180deg,#fff 0%,#fbfdff 100%);border:1px solid var(--line);border-radius:22px;padding:18px}
label{display:block;font-weight:800;margin-bottom:10px;color:#1f3354}
textarea,input,select{width:100%;border:1px solid #d7e1ee;background:#fcfdff;border-radius:16px;padding:14px 16px;font:inherit;color:var(--text);outline:none}
textarea{min-height:220px;resize:vertical}
input:focus,textarea:focus,select:focus{border-color:#95b4ff;box-shadow:0 0 0 4px rgba(37,99,235,.10)}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:16px}
button,.button{appearance:none;border:none;border-radius:16px;padding:13px 16px;font:inherit;font-weight:800;cursor:pointer;transition:.22s ease;box-shadow:0 10px 20px rgba(16,32,59,.08)}
button.primary,.button.primary{background:linear-gradient(135deg,#1d4ed8,#3b82f6);color:#fff}
button.secondary,.button.secondary{background:#fff;border:1px solid var(--line);color:var(--text)}
button.accent{background:linear-gradient(135deg,#f59e0b,#fbbf24);color:#1f2937}
button:hover,.button:hover{transform:translateY(-2px)}
.output{white-space:pre-wrap;word-break:break-word;background:#0f172a;color:#e2e8f0;border-radius:18px;padding:16px;min-height:220px;overflow:auto}
.note{font-size:14px;color:var(--muted);line-height:1.65}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:18px;background:#fff}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{padding:12px 14px;border-bottom:1px solid #e9eef5;text-align:left}
th{background:#f8fbff;font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:#5c6f8b}
.kv{display:grid;grid-template-columns:180px 1fr;gap:12px;border-bottom:1px solid #eef2f7;padding:12px 0}
.kv b{color:#1f3354}
.highlight{background:linear-gradient(180deg,rgba(253,230,138,.72),rgba(253,230,138,.72));padding:0 .08em;border-radius:4px}
.color-preview{height:140px;border-radius:20px;border:1px solid var(--line);box-shadow:inset 0 0 0 1px rgba(255,255,255,.4)}
.dual{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
@media (max-width:900px){
  .utility-hero,.grid-2,.dual{grid-template-columns:1fr}
  .headline p{font-size:16px}
}

.result-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.stat{padding:16px;border-radius:18px;background:#fff;border:1px solid var(--line)}
.stat h4{margin:0 0 8px;font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:#64748b}
.stat div{font-size:24px;font-weight:900;word-break:break-word}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.inline-actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.badge{display:inline-flex;padding:8px 10px;border-radius:999px;background:#eef3fb;border:1px solid #d8e2f0;font-weight:800;color:#24385b;font-size:12px}
pre{margin:0}
.codeblock{background:#0f172a;color:#e2e8f0;border-radius:18px;padding:16px;overflow:auto}
@media (max-width:900px){.result-grid{grid-template-columns:1fr}}

.toolbar{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.helper{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:12px}.status{display:inline-flex;align-items:center;gap:8px;padding:9px 12px;border-radius:999px;background:#eef3fb;border:1px solid #d8e2f0;font-weight:800;color:#24385b;font-size:12px}.status.error{background:#fef2f2;border-color:#fecaca;color:#991b1b}.status.success{background:#ecfdf5;border-color:#bbf7d0;color:#166534}.list{display:grid;gap:10px}.list-item{padding:14px 16px;border:1px solid var(--line);border-radius:18px;background:#fff}.hint{margin-top:10px;font-size:13px;color:var(--muted)}