:root{
  --bg:#f6f7fb; --card:#fff; --ink:#15161d; --muted:#6b7280;
  --brand:#2f6df6; --brand-d:#1e50c8; --line:#e5e7eb; --ok:#0f9d58; --err:#d93025;
  --radius:12px; --shadow:0 1px 3px rgba(16,24,40,.06),0 8px 24px rgba(16,24,40,.05);
}
*{box-sizing:border-box}
body{margin:0;font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}

/* header */
header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
header .wrap{display:flex;align-items:center;gap:16px;height:62px}
.brand{font-weight:700;font-size:19px;color:var(--ink);display:flex;align-items:center;gap:9px}
.brand span{display:inline-flex;width:28px;height:28px;border-radius:7px;background:var(--brand);
  color:#fff;align-items:center;justify-content:center;font-size:14px;font-weight:700}
nav{margin-left:auto;display:flex;gap:20px;font-size:15px}
nav a{color:#4b5563}
nav a:hover{color:var(--brand)}
@media(max-width:720px){nav{gap:12px;font-size:14px}nav a:nth-child(n+4){display:none}}

/* hero */
.hero{background:linear-gradient(160deg,#eef4ff,#f8fbff 60%);border-bottom:1px solid var(--line)}
.hero .wrap{padding:52px 20px 44px}
.hero h1{margin:0 0 12px;font-size:34px;line-height:1.25;letter-spacing:-.4px}
.hero p{margin:0;color:#475569;font-size:17px;max-width:640px}
.badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.badge{background:#fff;border:1px solid var(--line);border-radius:999px;padding:5px 13px;font-size:13px;color:#475569}

/* grid of tools */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(232px,1fr));gap:16px;margin:34px 0 10px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;
  box-shadow:var(--shadow);transition:.15s;display:block;color:inherit}
.card:hover{transform:translateY(-2px);border-color:#c7d7fb;text-decoration:none}
.card .ico{font-size:26px;line-height:1}
.card h3{margin:9px 0 5px;font-size:16px}
.card p{margin:0;font-size:13.5px;color:var(--muted);line-height:1.55}

/* tool page */
.tool{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:22px;margin:26px 0}
#drop{border:2px dashed #cbd5e1;border-radius:var(--radius);padding:38px 20px;text-align:center;
  cursor:pointer;transition:.15s;background:#fbfcfe}
#drop:hover,#drop.over{border-color:var(--brand);background:#f2f7ff}
#drop strong{display:block;font-size:16px;margin-bottom:5px}
#drop span{color:var(--muted);font-size:14px}
#filelist{list-style:none;padding:0;margin:14px 0 0;font-size:14px}
#filelist li{display:flex;align-items:center;gap:8px;padding:7px 11px;background:#f6f8fb;border-radius:8px;margin-bottom:6px}
#filelist .muted{margin-left:auto}
#filelist .x{border:0;background:transparent;color:var(--muted);cursor:pointer;font-size:17px;line-height:1}
#opts{margin:18px 0;display:grid;gap:13px}
#opts label{display:grid;gap:6px;font-size:14px;font-weight:600;color:#374151}
#opts input[type=text],#opts input:not([type]),#opts input[type=number],#opts select{
  padding:9px 11px;border:1px solid var(--line);border-radius:9px;font-size:15px;font-weight:400;background:#fff;width:100%}
#opts input[type=range]{width:100%}
#opts .hint{margin:0;font-size:13px;color:var(--muted);font-weight:400}
button.primary,#run{background:var(--brand);color:#fff;border:0;border-radius:10px;padding:12px 24px;
  font-size:16px;font-weight:600;cursor:pointer}
button.primary:hover,#run:hover{background:var(--brand-d)}
#run:disabled{background:#cbd5e1;cursor:not-allowed}
#result{margin-top:18px;padding-top:18px;border-top:1px solid var(--line)}
#result .ok{color:var(--ok);font-weight:600;margin:0 0 12px}
#result .err{color:var(--err);font-weight:600;margin:0}
#result .muted{color:var(--muted);margin:0}
.outs{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.outs button,figcaption button{background:#fff;border:1px solid var(--line);border-radius:9px;
  padding:9px 14px;cursor:pointer;font-size:14px;width:100%;text-align:left}
.outs button:hover,figcaption button:hover{border-color:var(--brand);color:var(--brand)}
.thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;margin:0}
.thumbs figure{margin:0;background:#f6f8fb;border:1px solid var(--line);border-radius:10px;padding:8px}
.thumbs img{width:100%;border-radius:6px;display:block;background:#fff}
.thumbs figcaption{margin-top:7px}
.textout{background:#f6f8fb;border:1px solid var(--line);border-radius:10px;padding:14px;
  max-height:340px;overflow:auto;white-space:pre-wrap;font-size:13.5px;margin-top:12px}

/* content pages */
.prose{max-width:760px;margin:0 auto;padding:34px 20px}
.prose h1{font-size:30px;margin:0 0 8px}
.prose h2{font-size:21px;margin:30px 0 10px;padding-top:8px}
.prose h3{font-size:17px;margin:22px 0 8px}
.prose p,.prose li{color:#374151}
.prose ul{padding-left:22px}
.breadcrumb{font-size:13px;color:var(--muted);margin:22px 0 0}
.breadcrumb a{color:var(--muted)}
.faq details{background:#fff;border:1px solid var(--line);border-radius:10px;padding:13px 16px;margin-bottom:9px}
.faq summary{cursor:pointer;font-weight:600}
.faq p{margin:10px 0 0;font-size:14.5px;color:#4b5563}

.ad-wrap{margin:24px 0;text-align:center;min-height:100px}
footer{border-top:1px solid var(--line);background:#fff;margin-top:44px;padding:26px 0;font-size:14px;color:var(--muted)}
footer .wrap{display:flex;flex-wrap:wrap;gap:16px;align-items:center}
footer nav{margin-left:auto}
@media(max-width:720px){.hero h1{font-size:26px}.hero .wrap{padding:36px 20px 30px}}