:root {
  --bg: #ffffff; --bg-soft: #f7f8fa; --bg-card: #ffffff;
  --border: #e5e7eb; --text: #0f172a; --text-soft: #475569; --text-muted: #64748b;
  --brand: #6366f1; --brand-dark: #4f46e5; --brand-soft: #eef2ff;
  --accent: #14b8a6; --success: #16a34a; --warn: #f59e0b; --danger: #ef4444;
  --shadow: 0 1px 2px rgba(15,23,42,.06), 0 4px 12px rgba(15,23,42,.04);
  --radius: 10px; --radius-sm: 6px; --maxw: 1120px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg:#0b1020; --bg-soft:#0f1530; --bg-card:#131a35; --border:#1f2746;
    --text:#e6ebff; --text-soft:#b3bde0; --text-muted:#8a93b8;
    --brand:#818cf8; --brand-dark:#6366f1; --brand-soft:#1e2350;
    --accent:#2dd4bf; --shadow: 0 1px 2px rgba(0,0,0,.4), 0 6px 18px rgba(0,0,0,.35);
  }
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
.container{width:min(100% - 32px, var(--maxw));margin-inline:auto}
.site-nav{position:sticky;top:0;z-index:50;backdrop-filter:saturate(160%) blur(10px);background:color-mix(in srgb,var(--bg) 82%,transparent);border-bottom:1px solid var(--border)}
.site-nav .container{display:flex;align-items:center;gap:24px;height:58px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:var(--text)}
.brand:hover{text-decoration:none;color:var(--brand)}
.brand-logo{width:28px;height:28px;border-radius:7px;background:linear-gradient(135deg,var(--brand),var(--accent));display:inline-flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:14px}
.nav-links{display:flex;gap:18px;margin-left:auto;font-size:14px;color:var(--text-soft)}
.nav-links a{color:var(--text-soft)}
.nav-links a:hover{color:var(--brand);text-decoration:none}
.nav-links a.active{color:var(--text);font-weight:600}
.hero{padding:72px 0 48px;text-align:center}
.hero h1{font-size:clamp(28px,4.6vw,48px);line-height:1.1;margin:0 0 12px;letter-spacing:-.02em}
.hero p{max-width:640px;margin:0 auto;color:var(--text-soft);font-size:clamp(15px,2vw,18px)}
.hero .slogan{color:var(--brand);font-weight:600}
section{padding:40px 0}
section h2{font-size:22px;margin:0 0 20px;letter-spacing:-.01em}
.section-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:20px;gap:12px;flex-wrap:wrap}
.section-head h2{margin:0}
.section-head a{font-size:14px}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.tool-card{display:block;padding:18px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);color:var(--text);transition:transform .15s ease,border-color .15s ease}
.tool-card:hover{text-decoration:none;transform:translateY(-2px);border-color:var(--brand)}
.tool-card .emoji{font-size:22px}
.tool-card h3{margin:10px 0 6px;font-size:16px;font-weight:600}
.tool-card p{margin:0;font-size:13px;color:var(--text-muted);line-height:1.5}
.tool-card .badge{display:inline-block;margin-top:10px;padding:2px 8px;font-size:11px;border-radius:999px;background:var(--brand-soft);color:var(--brand);font-weight:600}
.site-foot{border-top:1px solid var(--border);padding:32px 0;margin-top:48px;color:var(--text-muted);font-size:13px}
.site-foot .container{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between}
.site-foot a{color:var(--text-muted);margin-right:14px}
.site-foot a:hover{color:var(--brand)}
.tool-page .intro{padding:40px 0 24px}
.tool-page .intro h1{font-size:clamp(24px,3.4vw,36px);margin:0 0 10px;letter-spacing:-.02em}
.tool-page .intro .tagline{color:var(--text-soft);margin:0 0 8px}
.tool-page .privacy-note{display:inline-flex;align-items:center;gap:8px;background:var(--brand-soft);color:var(--brand-dark);padding:6px 12px;border-radius:999px;font-size:13px;font-weight:500}
.breadcrumb{font-size:13px;color:var(--text-muted);margin-bottom:10px}
.breadcrumb a{color:var(--text-muted)}
.workspace{display:grid;grid-template-columns:1fr;gap:18px;padding:10px 0 40px}
@media (min-width:880px){.workspace{grid-template-columns:1fr 1fr}}
.panel{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;display:flex;flex-direction:column}
.panel h3{margin:0 0 10px;font-size:14px;font-weight:600;color:var(--text-soft);text-transform:uppercase;letter-spacing:.06em}
.panel-full{grid-column:1 / -1}
textarea,input[type=text],input[type=url],input[type=number],input[type=file],select{width:100%;font:inherit;padding:10px 12px;background:var(--bg-soft);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-sm);outline:none}
textarea{min-height:280px;font-family:ui-monospace,"JetBrains Mono",Menlo,Consolas,monospace;font-size:13px;line-height:1.5;resize:vertical}
textarea:focus,input:focus,select:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
.toolbar{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
button,.btn{font:inherit;padding:9px 16px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-soft);color:var(--text);cursor:pointer;transition:background .15s,border-color .15s,transform .05s;display:inline-flex;align-items:center;gap:6px;font-weight:500}
button:hover{border-color:var(--brand);color:var(--brand)}
button:active{transform:translateY(1px)}
button.primary{background:var(--brand);border-color:var(--brand);color:#fff}
button.primary:hover{background:var(--brand-dark);border-color:var(--brand-dark);color:#fff}
button.ghost{background:transparent}
.output{background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px;min-height:280px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px;white-space:pre-wrap;overflow:auto;color:var(--text)}
.status{font-size:13px;padding:6px 10px;border-radius:var(--radius-sm);margin-top:8px}
.status.ok{background:rgba(22,163,74,.12);color:var(--success)}
.status.err{background:rgba(239,68,68,.12);color:var(--danger)}
.status.info{background:var(--brand-soft);color:var(--brand-dark)}
.slider-row{display:grid;grid-template-columns:80px 1fr 60px;gap:10px;align-items:center;margin-bottom:8px}
.slider-row input[type=range]{width:100%}
code{background:var(--bg-soft);padding:1px 6px;border-radius:4px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.92em}
pre{background:var(--bg-soft);border:1px solid var(--border);padding:14px;border-radius:var(--radius-sm);overflow:auto;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;margin-bottom:10px;background:var(--bg-card)}
.faq-item h3{margin:0 0 6px;font-size:16px}
.faq-item p{margin:0;color:var(--text-soft)}
@media (max-width:640px){.nav-links{gap:12px;font-size:13px}.hero{padding:48px 0 24px}}
.grid-2{display:grid;grid-template-columns:1fr;gap:14px}
@media (min-width:720px){.grid-2{grid-template-columns:1fr 1fr}}
.pill{display:inline-block;padding:4px 10px;font-size:12px;background:var(--bg-soft);border:1px solid var(--border);border-radius:999px;color:var(--text-soft)}
@media (prefers-color-scheme: dark){.tool-page .privacy-note{color:#c7d2fe}.status.ok{color:#4ade80}.status.err{color:#fca5a5}.status.info{color:#c7d2fe}}