:root{--primary-color: #007aff;--success-color: #34c759;--danger-color: #ff3b30;--bg-color: #f5f5f7;--card-bg: #ffffff;--text-primary: #1d1d1f;--text-secondary: #6e6e73;--border-color: #d2d2d7;--shadow: 0 2px 10px rgba(0, 0, 0, .1)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg-color);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app{min-height:100vh;display:flex;flex-direction:column}.header{background:var(--card-bg);padding:16px;text-align:center;border-bottom:1px solid var(--border-color);position:sticky;top:0;z-index:10}.header h1{font-size:20px;font-weight:600}.main{flex:1;padding:16px;max-width:600px;width:100%;margin:0 auto}.add-group-form{background:var(--card-bg);padding:16px;border-radius:12px;margin-bottom:20px;box-shadow:var(--shadow)}.add-group-form input{width:100%;padding:12px;border:1px solid var(--border-color);border-radius:8px;font-size:16px;margin-bottom:12px;outline:none}.add-group-form input:focus{border-color:var(--primary-color)}.add-group-form button{width:100%;padding:12px;background:var(--primary-color);color:#fff;border:none;border-radius:8px;font-size:16px;font-weight:500;cursor:pointer;transition:opacity .2s}.add-group-form button:active{opacity:.8}.groups{display:flex;flex-direction:column;gap:20px}.group{background:var(--card-bg);padding:16px;border-radius:12px;box-shadow:var(--shadow)}.group-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--border-color)}.group-header h2{font-size:18px;font-weight:600}.delete-btn{background:transparent;border:none;color:var(--danger-color);font-size:20px;cursor:pointer;padding:4px 8px;line-height:1}.buttons-container{display:flex;flex-direction:column;gap:10px;margin-bottom:16px}.action-btn{padding:14px 16px;background:var(--bg-color);border:2px solid var(--border-color);border-radius:8px;font-size:16px;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:8px;font-weight:500;position:relative}.action-btn:active{transform:scale(.98)}.action-btn.active{background:var(--success-color);border-color:var(--success-color);color:#fff}.check-icon{display:flex;align-items:center;justify-content:center}.control-buttons{display:flex;gap:10px}.control-btn{flex:1;padding:10px;background:transparent;border:1px solid var(--primary-color);color:var(--primary-color);border-radius:8px;font-size:14px;cursor:pointer;transition:all .2s}.control-btn:active{opacity:.7}.reset-btn{border-color:var(--danger-color);color:var(--danger-color)}.add-button-form{background:var(--bg-color);padding:12px;border-radius:8px;margin-top:12px}.add-button-form input{width:100%;padding:12px;border:1px solid var(--border-color);border-radius:8px;font-size:16px;margin-bottom:10px;outline:none}.add-button-form input:focus{border-color:var(--primary-color)}.form-actions{display:flex;gap:10px}.form-actions button{flex:1;padding:10px;border:none;border-radius:8px;font-size:14px;cursor:pointer;transition:opacity .2s}.form-actions button:first-child{background:var(--primary-color);color:#fff}.form-actions button:last-child{background:var(--border-color);color:var(--text-primary)}.form-actions button:active{opacity:.8}.empty-state{text-align:center;padding:40px 20px;color:var(--text-secondary)}@supports (-webkit-touch-callout: none){.app{padding-bottom:env(safe-area-inset-bottom)}.header{padding-top:max(16px,env(safe-area-inset-top))}}*{margin:0;padding:0;box-sizing:border-box}html,body,#app{width:100%;height:100%}body{-webkit-tap-highlight-color:transparent;touch-action:manipulation}