*,:after,:before{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0f0f0f;--surface:#1a1a1a;--surface-hover:#222;--border:#2a2a2a;--text:#e5e5e5;--text-muted:#888;--accent:#6366f1;--accent-hover:#818cf8;--active-bg:#6366f120;--active-border:#6366f1}body,html{height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text)}.app{height:100vh}.app,.sidebar{display:flex;overflow:hidden}.sidebar{width:300px;min-width:300px;background:var(--surface);border-right:1px solid var(--border);flex-direction:column}.sidebar-header{padding:20px;border-bottom:1px solid var(--border)}.sidebar-header h1{font-size:16px;font-weight:600;margin-bottom:4px}.sidebar-header p{font-size:12px;color:var(--text-muted)}.sidebar-section{padding:12px 16px 6px}.sidebar-section-label{font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:1px;color:var(--text-muted);margin-bottom:6px}.sidebar-list{flex:1 1;overflow-y:auto;padding:8px}.template-group{margin-bottom:12px}.template-group-label{font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:1px;color:var(--text-muted);padding:8px 12px 4px}.template-item{display:block;width:100%;padding:8px 12px;background:none;border:1px solid transparent;border-radius:6px;color:var(--text);font-size:13px;text-align:left;cursor:pointer;transition:all .15s}.template-item:hover{background:var(--surface-hover)}.template-item.active{background:var(--active-bg);border-color:var(--active-border);color:var(--accent)}.controls{padding:16px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:10px}.control-row{display:flex;align-items:center;gap:8px}.control-label{font-size:11px;font-weight:500;color:var(--text-muted);min-width:50px}.control-select{flex:1 1;padding:6px 10px;background:var(--bg);border:1px solid var(--border);border-radius:6px;color:var(--text);font-size:12px;outline:none}.control-select:focus{border-color:var(--accent)}.viewport-toggle{display:flex;gap:4px}.viewport-btn{flex:1 1;padding:6px;background:var(--bg);border:1px solid var(--border);border-radius:6px;color:var(--text-muted);font-size:11px;cursor:pointer;transition:all .15s}.viewport-btn:hover{color:var(--text)}.viewport-btn.active{background:var(--active-bg);border-color:var(--active-border);color:var(--accent)}.preview-area{flex:1 1;display:flex;flex-direction:column;overflow:hidden}.preview-toolbar{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;background:var(--surface);border-bottom:1px solid var(--border);font-size:12px;color:var(--text-muted)}.preview-toolbar-left{display:flex;align-items:center;gap:12px}.preview-toolbar .badge{padding:2px 8px;background:var(--active-bg);border:1px solid var(--active-border);border-radius:4px;color:var(--accent);font-size:11px}.preview-container{flex:1 1;display:flex;justify-content:center;background:#e5e5e5;overflow:auto;padding:20px}.preview-iframe{background:white;border:none;box-shadow:0 4px 24px rgba(0,0,0,.15);transition:width .3s ease;height:100%;min-height:600px}.source-view{flex:1 1;overflow:auto;padding:20px;background:var(--bg)}.source-view pre{font-family:SF Mono,Fira Code,monospace;font-size:12px;line-height:1.6;color:var(--text);white-space:pre-wrap;word-break:break-all}.tab-buttons{display:flex;gap:0}.tab-btn{padding:6px 14px;background:none;border:1px solid var(--border);color:var(--text-muted);font-size:12px;cursor:pointer;transition:all .15s}.tab-btn:first-child{border-radius:6px 0 0 6px}.tab-btn:last-child{border-radius:0 6px 6px 0}.tab-btn.active{background:var(--active-bg);border-color:var(--active-border);color:var(--accent)}.loading{display:flex;align-items:center;justify-content:center;height:100%;color:var(--text-muted);font-size:14px}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#444}