*{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#fafafa;--card:#fff;--text:#1a1a1a;--muted:#666;--border:#e0e0e0;--accent:#2563eb;--accent-hover:#1d4ed8;--radius:12px}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
header{background:#fff;border-bottom:1px solid var(--border);padding:12px 24px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100}
.logo{font-size:1.4rem;font-weight:700;color:var(--text);display:flex;align-items:center;gap:8px}
.logo svg{width:28px;height:28px}
nav{display:flex;gap:16px;align-items:center}
nav a{color:var(--muted);font-size:.9rem;font-weight:500}
nav a:hover,nav a.active{color:var(--accent);text-decoration:none}
.lang-switch{display:flex;gap:4px;margin-left:12px}
.lang-switch button{background:none;border:1px solid var(--border);border-radius:6px;padding:2px 8px;font-size:.75rem;cursor:pointer;color:var(--muted)}
.lang-switch button.active{background:var(--accent);color:#fff;border-color:var(--accent)}
main{flex:1;max-width:800px;width:100%;margin:0 auto;padding:32px 20px}
h1{font-size:2rem;font-weight:700;margin-bottom:8px}
h2{font-size:1.3rem;font-weight:600;margin-bottom:16px}
.subtitle{color:var(--muted);margin-bottom:32px;font-size:1.05rem}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:20px}
.card h3{font-size:1.1rem;margin-bottom:8px}
.card p{color:var(--muted);font-size:.9rem}
.hero-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:32px 0}
.hero-card{display:flex;flex-direction:column;align-items:center;text-align:center;padding:40px 24px;transition:border-color .2s,box-shadow .2s;cursor:pointer;text-decoration:none!important;color:var(--text)}
.hero-card:hover{border-color:var(--accent);box-shadow:0 4px 20px rgba(37,99,235,.1)}
.hero-card svg{width:48px;height:48px;margin-bottom:16px;color:var(--accent)}
.hero-card h3{margin-bottom:4px}
.form-group{margin-bottom:16px}
.form-group label{display:block;font-weight:500;margin-bottom:6px;font-size:.9rem}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:10px 14px;border:1px solid var(--border);border-radius:8px;font-size:.95rem;background:#fff;transition:border-color .2s}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--accent)}
.form-group textarea{resize:vertical;min-height:80px}
.color-row{display:flex;gap:16px}
.color-row .form-group{flex:1}
.color-row input[type=color]{height:42px;padding:4px;cursor:pointer}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 24px;border:none;border-radius:8px;font-size:.95rem;font-weight:500;cursor:pointer;transition:background .2s}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-hover)}
.btn-secondary{background:#f3f4f6;color:var(--text)}
.btn-secondary:hover{background:#e5e7eb}
.btn-row{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}
#qr-output{text-align:center;margin-top:24px}
#qr-output canvas{max-width:100%;border-radius:8px;border:1px solid var(--border)}
#decode-result{margin-top:20px;word-break:break-all}
.drop-zone{border:2px dashed var(--border);border-radius:var(--radius);padding:48px 24px;text-align:center;cursor:pointer;transition:border-color .2s;color:var(--muted)}
.drop-zone:hover,.drop-zone.dragover{border-color:var(--accent);color:var(--accent)}
.drop-zone input{display:none}
footer{text-align:center;padding:24px;color:var(--muted);font-size:.8rem;border-top:1px solid var(--border)}
footer a{color:var(--muted)}
.tip-box{margin-top:24px;padding:16px;background:#f8fafc;border-radius:8px;font-size:.85rem;color:var(--muted);text-align:center}
.tip-box code{background:#e5e7eb;padding:2px 6px;border-radius:4px;font-size:.8rem;user-select:all}
@media(max-width:600px){
.hero-cards{grid-template-columns:1fr}
h1{font-size:1.5rem}
main{padding:20px 16px}
.color-row{flex-direction:column;gap:0}
}