:root{
  --bg:#f5f7fb;--surface:#fff;--surface2:#f8fafc;--surface3:#eef3f9;
  --text:#0f172a;--muted:#64748b;--border:#dbe3ee;--border2:#e9eef5;
  --accent:#2563eb;--accent2:#1d4ed8;--success:#16a34a;--danger:#dc2626;
  --shadow:0 14px 34px rgba(15,23,42,.07)
}
html[data-theme="dark"]{
  --bg:#0b1120;--surface:#111827;--surface2:#0f172a;--surface3:#182235;
  --text:#f8fafc;--muted:#9aa8bc;--border:#29364a;--border2:#1f2b3e;
  --accent:#60a5fa;--accent2:#7db7fb;--success:#4ade80;--danger:#f87171;
  --shadow:0 18px 46px rgba(0,0,0,.22)
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-height:100vh;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}button,input,select,textarea{font:inherit}a{color:inherit}
.shell{width:min(1160px,calc(100% - 32px));margin:0 auto}
.topbar{display:flex;align-items:center;gap:18px;min-height:72px;border-bottom:1px solid var(--border2)}
.brand{text-decoration:none;font-size:1.45rem;font-weight:900;letter-spacing:-.04em}.brand span{color:var(--accent)}
nav{display:flex;gap:20px;margin-left:auto}nav a{text-decoration:none;color:var(--muted);font-size:.92rem;font-weight:600}nav a:hover{color:var(--text)}
.header-tools{display:flex;align-items:center;gap:7px}.language-select,.icon-btn{height:36px;border:1px solid var(--border);border-radius:9px;background:var(--surface);color:var(--text)}.language-select{padding:0 8px;font-size:.82rem;font-weight:700}.icon-btn{width:36px;display:grid;place-items:center;cursor:pointer}.icon-btn:hover{background:var(--surface3)}.icon-btn svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.hero{padding:42px 0 20px}.badge{display:inline-flex;padding:7px 10px;border:1px solid var(--border);border-radius:999px;background:var(--surface);color:var(--muted);font-size:.79rem;font-weight:750}.hero h1{margin:16px 0 12px;font-size:clamp(2.2rem,5vw,4rem);line-height:1;letter-spacing:-.055em;max-width:720px}.hero p{margin:0;max-width:680px;color:var(--muted);font-size:1.06rem;line-height:1.7}
.tool-section{padding:16px 0 32px}.tool-card{background:var(--surface);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow);padding:20px}.tool-head{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;margin-bottom:18px}.tool-head h2{margin:0 0 6px;font-size:1.28rem}.tool-head p{margin:0;color:var(--muted);line-height:1.55}
.builder{display:grid;grid-template-columns:210px minmax(340px,1fr) minmax(310px,.86fr);gap:16px;align-items:start}.panel{border:1px solid var(--border2);border-radius:14px;background:var(--surface2);padding:15px}.panel h3{margin:0 0 12px;font-size:.96rem}.type-list{display:flex;flex-direction:column;gap:7px}.type-btn{display:flex;align-items:center;gap:10px;width:100%;border:1px solid transparent;border-radius:10px;background:transparent;color:var(--muted);padding:10px 11px;text-align:left;cursor:pointer;font-weight:680}.type-btn:hover{background:var(--surface3);color:var(--text)}.type-btn.active{background:var(--surface);border-color:var(--border);color:var(--text);box-shadow:0 1px 2px rgba(15,23,42,.04)}.type-icon{width:28px;height:28px;display:grid;place-items:center;border-radius:8px;background:var(--surface3);color:var(--accent);font-size:.72rem;font-weight:900}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.field{display:flex;flex-direction:column;gap:6px}.field.full{grid-column:1/-1}.field label,.setting label{font-size:.84rem;font-weight:650;color:var(--muted)}.field input,.field textarea,.field select,.setting select,.setting input[type="number"]{width:100%;border:1px solid var(--border);border-radius:10px;background:var(--surface);color:var(--text);padding:10px 11px;outline:none}.field textarea{min-height:96px;resize:vertical}.field input:focus,.field textarea:focus,.field select:focus,.setting select:focus{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 13%,transparent)}.check{display:flex;align-items:center;gap:8px;padding-top:8px}.check input{accent-color:var(--accent)}
.settings-box{margin-top:14px;padding-top:14px;border-top:1px solid var(--border2)}.settings-title{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}.settings-title strong{font-size:.9rem}.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.setting{display:flex;flex-direction:column;gap:6px}.color-row{display:flex;align-items:center;gap:8px}.color-row input[type="color"]{width:44px;height:38px;padding:2px;border:1px solid var(--border);border-radius:9px;background:var(--surface)}.color-row span{font-size:.78rem;color:var(--muted);font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.toggle-row{display:flex;align-items:center;gap:8px;margin-top:10px;color:var(--muted);font-size:.84rem}.toggle-row input{accent-color:var(--accent)}
.preview-panel{position:sticky;top:16px}.preview-stage{display:grid;place-items:center;min-height:320px;border:1px solid var(--border);border-radius:13px;background:#fff;padding:18px;overflow:auto}.preview-stage.empty{background:var(--surface)}.preview-stage svg{display:block;max-width:100%;height:auto}.empty-state{text-align:center;color:var(--muted);font-size:.9rem;line-height:1.55;max-width:220px}.qr-meta{display:flex;justify-content:space-between;gap:10px;margin-top:10px;color:var(--muted);font-size:.78rem}.qr-error{color:var(--danger);font-size:.82rem;margin-top:9px;line-height:1.45}.download-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}.primary,.secondary{display:inline-flex;align-items:center;justify-content:center;min-height:41px;border-radius:10px;padding:10px 12px;font-weight:760;text-decoration:none;cursor:pointer}.primary{border:1px solid transparent;background:var(--accent);color:#fff}.primary:hover{background:var(--accent2)}.secondary{border:1px solid var(--border);background:var(--surface);color:var(--text)}.secondary:hover{background:var(--surface3)}.disabled,.primary:disabled,.secondary:disabled{opacity:.5;pointer-events:none;cursor:not-allowed}.copy-row{margin-top:8px}.copy-row .secondary{width:100%}
.steps,.faq{padding:18px 0 32px}.steps h2,.faq h2{font-size:1.55rem;letter-spacing:-.03em;margin:0 0 14px}.step-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.step-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:18px}.step-card strong{display:block;margin-bottom:7px}.step-card p{margin:0;color:var(--muted);line-height:1.6;font-size:.92rem}.faq{max-width:850px}.faq details{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:15px 17px;margin-bottom:9px}.faq summary{cursor:pointer;font-weight:720}.faq p{margin:10px 0 0;color:var(--muted);line-height:1.65}
footer{display:flex;justify-content:space-between;gap:16px;padding:22px 0 36px;border-top:1px solid var(--border2);color:var(--muted);font-size:.88rem}.footer-links{display:flex;gap:14px}.footer-links a{text-decoration:none}.footer-links a:hover{color:var(--text)}
.hidden{display:none!important}
@media(max-width:1000px){.builder{grid-template-columns:190px 1fr}.preview-panel{grid-column:1/-1;position:static}.preview-stage{min-height:280px}.download-actions{max-width:500px}}
@media(max-width:720px){.shell{width:min(1160px,calc(100% - 20px))}.topbar{min-height:64px;flex-wrap:wrap;padding:10px 0}.brand{margin-right:auto}nav{display:none}.header-tools{margin-left:0}.social-extra{display:none}.hero{padding-top:28px}.builder{grid-template-columns:1fr}.type-list{display:grid;grid-template-columns:repeat(3,1fr)}.type-btn{flex-direction:column;justify-content:center;text-align:center;padding:9px 5px;font-size:.76rem}.form-grid,.settings-grid{grid-template-columns:1fr}.field.full{grid-column:auto}.step-grid{grid-template-columns:1fr}.download-actions{grid-template-columns:1fr}footer{flex-direction:column}.tool-card{padding:14px}}