:root{--bg:#f6f8fc;--surface:#fff;--text:#172033;--muted:#667085;--line:#e4e9f2;--accent:#3157d5;--accent2:#233fa5;--soft:#edf2ff;--ok:#127a45;--warn:#996400;--danger:#b42318;--shadow:0 10px 30px rgba(31,45,75,.08);--radius:18px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.55}a{color:inherit}.wrap{width:min(1120px,calc(100% - 32px));margin:auto}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}.nav{min-height:68px;display:flex;align-items:center;gap:22px}.brand{font-weight:850;font-size:23px;letter-spacing:-.03em;text-decoration:none}.nav-links{margin-left:auto;display:flex;align-items:center;gap:18px}.nav-links a{text-decoration:none;color:var(--muted);font-weight:650}.hero{padding:72px 0 44px;text-align:center}.eyebrow,.badge{display:inline-flex;align-items:center;gap:7px;padding:6px 10px;border-radius:999px;background:var(--soft);font-size:12px;font-weight:800;letter-spacing:.035em}.hero h1{font-size:clamp(39px,7vw,70px);letter-spacing:-.055em;line-height:1.02;margin:17px auto 16px;max-width:850px}.hero p{font-size:clamp(17px,2.2vw,20px);color:var(--muted);max-width:760px;margin:0 auto}.section{padding:22px 0 68px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:20px}.section h2{letter-spacing:-.025em}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(255px,1fr));gap:18px}.card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:23px;text-decoration:none;box-shadow:var(--shadow);transition:.18s ease}.card:hover{transform:translateY(-2px);border-color:#cbd5e6}.card h3{font-size:20px;letter-spacing:-.025em;margin:12px 0 8px}.card p{margin:0;color:var(--muted)}.tool-shell{padding:44px 0 70px}.tool-head{max-width:760px;margin-bottom:24px}.tool-head h1{font-size:clamp(34px,5vw,52px);letter-spacing:-.045em;line-height:1.06;margin:10px 0 10px}.tool-head p{color:var(--muted);font-size:18px;margin:0}.panel{background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:24px;box-shadow:var(--shadow)}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.field{display:flex;flex-direction:column;gap:7px}.field.full{grid-column:1/-1}label{font-weight:750;font-size:14px}input,select,button{font:inherit}input[type=file],input[type=number],select{width:100%;border:1px solid #cfd7e6;background:#fff;border-radius:12px;padding:12px 13px;color:var(--text)}input:focus,select:focus{outline:3px solid rgba(49,87,213,.13);border-color:#7993e8}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.btn{appearance:none;border:0;border-radius:12px;padding:12px 17px;font-weight:800;cursor:pointer;background:var(--accent);color:#fff}.btn:hover{background:var(--accent2)}.btn.secondary{background:#eef1f6;color:var(--text)}.btn.secondary:hover{background:#e1e6ef}.btn:disabled{opacity:.55;cursor:not-allowed}.result{margin-top:18px;padding:15px 16px;border-radius:14px;background:#f8fafc;border:1px solid var(--line);white-space:pre-wrap}.result.ok{background:#effaf4;border-color:#bfe7cf;color:#0f6238}.result.warn{background:#fff8e7;border-color:#edd6a0;color:#724d00}.result.error{background:#fff1f0;border-color:#f1c0bd;color:#8c211b}.preview-wrap{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:18px}.preview-card{background:#fbfcfe;border:1px solid var(--line);border-radius:16px;padding:14px}.preview-card img,.preview-card canvas{width:100%;height:auto;max-height:420px;object-fit:contain;border-radius:10px;background:#eef1f6}.meta{font-size:13px;color:var(--muted);margin-top:8px}.tips{margin-top:20px;padding:18px;border-radius:16px;background:#fff;border:1px solid var(--line)}.tips h2{font-size:18px;margin:0 0 9px}.tips ul{margin:0;padding-left:20px;color:var(--muted)}.site-footer{border-top:1px solid var(--line);background:#fff}.footer-inner{padding:24px 0;color:var(--muted);font-size:14px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}.small{font-size:13px;color:var(--muted)}
@media(max-width:720px){.nav-links{display:none}.hero{padding-top:52px}.form-grid,.preview-wrap{grid-template-columns:1fr}.panel{padding:18px}.section{padding-bottom:52px}}
.dual-tools{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.mini-tool{border:1px solid var(--line);border-radius:16px;padding:18px;background:#fbfcfe}.mini-tool h2{margin:0 0 14px}.mini-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:12px}.small-canvas{display:block;width:100%;height:auto;max-height:280px;object-fit:contain;margin-top:14px;border-radius:10px;background:#eef1f6}@media(max-width:720px){.dual-tools,.mini-grid{grid-template-columns:1fr}}

.content-shell{padding:48px 0 72px}.content-card{max-width:860px;margin:auto;background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:28px;box-shadow:var(--shadow)}.content-card h1{font-size:clamp(34px,5vw,48px);letter-spacing:-.04em;line-height:1.08;margin:8px 0 18px}.content-card h2{margin-top:30px}.content-card p,.content-card li{color:var(--muted)}.footer-links{display:flex;gap:14px;flex-wrap:wrap}.footer-links a{color:var(--muted);text-decoration:none}.footer-links a:hover{text-decoration:underline}.notice{padding:14px 16px;border-radius:14px;background:#fff8e7;border:1px solid #edd6a0;color:#724d00}.skip-link{position:absolute;left:-9999px;top:auto}.skip-link:focus{left:12px;top:12px;z-index:100;background:#fff;padding:10px 14px;border:1px solid var(--line);border-radius:10px}

/* v10: tool-page SEO/help content */
.tool-guide{padding:8px 0 52px}.tool-guide>.wrap{border-top:1px solid var(--line,#d9e1ea);padding-top:28px}.tool-guide h2{margin:0 0 18px}.tool-guide h3{margin:0 0 8px;font-size:1rem}.tool-guide p,.tool-guide li{line-height:1.65}.tool-guide ol{padding-left:1.25rem;margin:0}.guide-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}.related-tools{margin-top:24px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}.related-tools h3{width:100%;margin-bottom:2px}.related-tools a{display:inline-block;padding:8px 11px;border:1px solid var(--line,#d9e1ea);border-radius:10px;text-decoration:none}.related-tools a:hover{text-decoration:underline}@media(max-width:720px){.guide-grid{grid-template-columns:1fr}}

/* Ordered multi-file controls */
.order-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px solid var(--line,#e4e9f2)}
.order-row:last-child{border-bottom:0}.order-row>span:first-child{min-width:0;overflow-wrap:anywhere}.order-row>span:last-child{display:flex;gap:8px;flex:0 0 auto}.order-row .btn{padding:8px 12px}
@media(max-width:640px){.order-row{align-items:flex-start;flex-direction:column}.order-row>span:last-child{width:100%}.order-row .btn{flex:1}}