:root{--bg: var(--tg-theme-bg-color, #ffffff);--text: var(--tg-theme-text-color, #111111);--hint: var(--tg-theme-hint-color, #707579);--accent: var(--tg-theme-button-color, #2b6cb0);--accent-text: var(--tg-theme-button-text-color, #ffffff);--border: #e5e5ea}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.app{display:flex;flex-direction:column;height:100%}.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border)}.lang-switch{border:1px solid var(--border);background:transparent;color:var(--text);border-radius:8px;padding:4px 10px;font-size:14px}.content{flex:1;overflow-y:auto;padding:16px}.error{color:#c0392b}.section h2{font-size:16px;margin-bottom:4px}.section ul{margin:0 0 16px;padding-inline-start:20px}.tabbar{display:flex;border-top:1px solid var(--border)}.tabbar button{flex:1;padding:10px 4px;background:none;border:none;color:var(--hint);font-size:12px}.tabbar button.active{color:var(--accent);font-weight:600}