.xb-card{margin-bottom:2rem;background:var(--surface,#fff);border:1px solid var(--border,rgba(0,0,0,.08));border-radius:16px;overflow:hidden;box-shadow:var(--shadow-soft,0 2px 12px rgba(0,0,0,.06));-webkit-tap-highlight-color:transparent;}
.xb-toolbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;padding:12px 14px;border-bottom:1px solid var(--border,rgba(0,0,0,.08));background:var(--surface-muted,rgba(0,0,0,.02));}
.xb-toolbar-left,.xb-toolbar-right{display:flex;flex-wrap:wrap;gap:8px;align-items:center;}
.xb-btn{font-size:0.875rem;font-weight:500;padding:10px 14px;border-radius:10px;border:1px solid transparent;cursor:pointer;transition:background .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease;-webkit-tap-highlight-color:transparent;}
.xb-btn:active{transform:scale(0.98);}
.xb-btn-primary{background:var(--primary,#2563eb);color:#fff;border-color:var(--primary,#2563eb);}
.xb-btn-primary:hover{background:var(--primary-dark,#1d4ed8);border-color:var(--primary-dark,#1d4ed8);box-shadow:0 4px 14px rgba(37,99,235,.25);}
.xb-btn-ghost{background:transparent;color:var(--text-main,#111);border-color:var(--border,rgba(0,0,0,.12));}
.xb-btn-ghost:hover{background:var(--surface-muted,rgba(0,0,0,.04));border-color:var(--border,rgba(0,0,0,.2));}
.xb-btn-outline{background:transparent;color:var(--primary,#2563eb);border-color:var(--primary,#2563eb);}
.xb-btn-outline:hover{background:rgba(37,99,235,.08);}
.xb-btn-outline.copied{background:rgba(34,197,94,.12);color:#15803d;border-color:#22c55e;}
.xb-segment{display:flex;padding:0 14px 12px;gap:4px;}
.xb-segment-btn{flex:1;font-size:0.8125rem;font-weight:500;padding:10px 14px;border-radius:10px;border:1px solid var(--border,rgba(0,0,0,.12));background:var(--surface,#fff);color:var(--text-muted,#6b7280);cursor:pointer;transition:background .2s ease,color .2s ease,border-color .2s ease;-webkit-tap-highlight-color:transparent;}
.xb-segment-btn:hover{background:var(--surface-muted,rgba(0,0,0,.04));color:var(--text-main,#111);}
.xb-segment-btn.xb-segment-active{background:var(--primary,#2563eb);color:#fff;border-color:var(--primary,#2563eb);}
.xb-panes{display:flex;flex-direction:column;min-height:260px;}
.xb-pane{display:flex;flex-direction:column;min-height:220px;}
.xb-pane-out{border-top:1px solid var(--border,rgba(0,0,0,.08));}
.xb-pane.hide-mobile{display:none;}
.xb-pane.show-mobile{display:flex;}
.xb-pane-title{font-size:0.8125rem;font-weight:600;color:var(--text-muted,#6b7280);margin:0;padding:10px 14px 8px;letter-spacing:.02em;}
.xb-editor-wrap{flex:1;padding:0 14px 14px;display:flex;min-height:0;}
.xb-editor{min-height:260px;width:100%;border-radius:10px;border:1px solid var(--border,rgba(0,0,0,.1));overflow:hidden;}
.xb-status{font-size:0.8125rem;color:var(--text-muted);margin:8px 14px 12px;min-height:1.25em;}
@media (min-width:768px){.xb-segment{display:none;}
.xb-panes{flex-direction:row;min-height:380px;}
.xb-pane{flex:1;min-height:0;}
.xb-pane.hide-mobile,.xb-pane.show-mobile{display:flex;}
.xb-pane-out{border-top:none;border-left:1px solid var(--border,rgba(0,0,0,.08));}
.xb-pane-title{padding:14px 20px 10px;}
.xb-editor-wrap{padding:0 20px 20px;}
.xb-editor{min-height:440px;flex:1;}
.xb-toolbar{padding:14px 20px;}
.xb-status{margin:10px 20px 14px;}
}
@media (min-width:992px){.xb-editor{min-height:480px;}
.xb-card{border-radius:20px;}
.xb-toolbar,.xb-panes{border-radius:20px 20px 0 0;}
.xb-panes{border-radius:0;}
}
@media (max-width:479px){.xb-toolbar{flex-direction:column;align-items:stretch;padding:10px 12px;gap:8px;}
.xb-toolbar-left,.xb-toolbar-right{justify-content:flex-start;}
.xb-btn{padding:10px 12px;font-size:0.8125rem;}
.xb-segment{padding:0 12px 10px;}
.xb-pane-title{padding:8px 12px 6px;}
.xb-editor-wrap{padding:0 12px 12px;}
.xb-editor{min-height:220px;}
.xb-status{margin:8px 12px 10px;}
}