.app{display:flex;min-height:100vh;background:#f7f7f7;color:#222;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial}
.sidebar{width:240px;background:#111;color:#fff;display:flex;flex-direction:column;padding:16px}
.brand{font-size:16px;font-weight:600;margin-bottom:12px}
.sidebar nav{display:flex;flex-direction:column}
.sidebar nav a{color:#bbb;text-decoration:none;padding:10px 8px;border-radius:6px}
.sidebar nav a.active,.sidebar nav a:hover{color:#fff;background:#1f1f1f}
.notice{margin-top:auto;font-size:12px;color:#999}
.main{flex:1;padding:24px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:16px}
.panel{background:#fff;border-radius:12px;padding:16px;box-shadow:0 2px 6px rgba(0,0,0,0.08)}
.panel h2{font-size:16px;margin:0 0 12px}
.form-row{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.form-row label{width:140px}
input,select,textarea,button{font:inherit}
input,select,textarea{flex:1;padding:8px;border:1px solid #ddd;border-radius:8px}
textarea{min-height:90px}
.preview canvas{width:100%;height:auto;border:1px dashed #ddd;border-radius:8px;background:#fff}
.actions{display:flex;gap:8px;margin-top:12px}
button{padding:10px 14px;border:none;border-radius:8px;background:#111;color:#fff;cursor:pointer}
button:hover{opacity:.9}
.tip{font-size:12px;color:#666;margin-top:8px}
.msg{margin-top:10px;color:#c00}
.features-list{list-style:none;padding:0;margin:0}
.features-list li{padding:6px 0;border-bottom:1px dashed #eee}