.studio-shell{max-width:820px;margin:0 auto;padding:100px 16px 60px;}
textarea.brief{width:100%;min-height:120px;border-radius:14px;padding:14px;background:rgba(15,23,42,.55);border:1px solid var(--glass-border);color:inherit;font:inherit;}
.msg{margin-top:12px;padding:10px;border-radius:10px;display:none;font-size:14px;}
.msg.err{display:block;background:rgba(239,68,68,.12);color:#fca5a5;}
.loading{display:none;align-items:center;gap:10px;color:var(--text-muted);}
.loading.show{display:flex;}
.spinner{width:18px;height:18px;border:2px solid rgba(255,255,255,.2);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite;}
.result-card{margin-top:20px;text-align:left;}
@keyframes spin{to{transform:rotate(360deg);}}