:root{--bg: #0d1117;--surface: #161b22;--surface-raised: #1c2129;--border: #30363d;--border-focus: #58a6ff;--text: #e6edf3;--text-dim: #8b949e;--accent: #58a6ff;--accent-hover: #79c0ff;--success: #3fb950;--error: #f85149;--warning: #d29922;--radius: 6px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;--mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, "Liberation Mono", monospace}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;padding:0 16px}header{text-align:center;padding:32px 0 8px}header h1{font-size:1.75rem;font-weight:700;letter-spacing:-.02em}.subtitle{color:var(--text-dim);font-size:.9rem;margin-top:4px}main{max-width:560px;margin:0 auto;padding-bottom:48px}.tabs{display:flex;gap:0;margin:24px 0 0;border-bottom:1px solid var(--border)}.tab{flex:1;padding:10px 16px;background:none;border:none;border-bottom:2px solid transparent;color:var(--text-dim);font-size:.95rem;font-weight:500;cursor:pointer;transition:color .15s,border-color .15s}.tab:hover{color:var(--text)}.tab.active{color:var(--accent);border-bottom-color:var(--accent)}.panel{padding:24px 0}.panel.hidden{display:none}.source-tabs{display:flex;gap:8px;margin-bottom:20px}.source-tab{padding:6px 14px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-dim);font-size:.85rem;cursor:pointer;transition:background .15s,color .15s,border-color .15s}.source-tab:hover{background:var(--surface-raised);color:var(--text)}.source-tab.active{background:var(--surface-raised);color:var(--accent);border-color:var(--accent)}.source-panel.hidden{display:none}.form-group{margin-bottom:16px}.form-group>label{display:block;font-size:.85rem;font-weight:500;margin-bottom:6px;color:var(--text)}.optional{color:var(--text-dim);font-weight:400}input[type=text],input[type=password],textarea{width:100%;padding:10px 12px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);font-family:var(--mono);font-size:.875rem;line-height:1.5;transition:border-color .15s}input[type=text]:focus,input[type=password]:focus,textarea:focus{outline:none;border-color:var(--border-focus)}textarea{resize:vertical;min-height:60px}.input-row{display:flex;gap:8px}.input-row input{flex:1}.toggle-pw{padding:8px 12px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-dim);font-size:.8rem;cursor:pointer;white-space:nowrap;transition:background .15s,color .15s}.toggle-pw:hover{background:var(--surface-raised);color:var(--text)}.radio-group{display:flex;gap:16px}.radio-label{display:flex;align-items:center;gap:6px;font-size:.875rem;color:var(--text);cursor:pointer}.radio-label input[type=radio]{accent-color:var(--accent)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 20px;border:1px solid transparent;border-radius:var(--radius);font-size:.9rem;font-weight:500;cursor:pointer;transition:background .15s,border-color .15s,opacity .15s;width:100%}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.primary{background:var(--accent);color:#fff}.btn.primary:hover:not(:disabled){background:var(--accent-hover)}.btn.secondary{background:var(--surface);border-color:var(--border);color:var(--text)}.btn.secondary:hover:not(:disabled){background:var(--surface-raised);border-color:var(--text-dim)}.copy-btn{position:absolute;top:6px;right:6px;padding:4px 8px;background:var(--surface-raised);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-dim);font-size:.75rem;cursor:pointer;white-space:nowrap;transition:background .15s,color .15s;z-index:1}.copy-btn:hover{background:var(--border);color:var(--text)}.output{margin-top:20px}.output.hidden{display:none}.output>label{display:block;font-size:.85rem;font-weight:500;margin-bottom:6px}.output-row{position:relative}.output-row textarea{width:100%;padding-right:60px}.status{margin-top:12px;padding:10px 14px;border-radius:var(--radius);font-size:.85rem}.status.hidden{display:none}.status.info{background:#58a6ff1a;border:1px solid rgba(88,166,255,.3);color:var(--accent)}.status.success{background:#3fb9501a;border:1px solid rgba(63,185,80,.3);color:var(--success)}.status.error{background:#f851491a;border:1px solid rgba(248,81,73,.3);color:var(--error)}.result-section{margin-bottom:20px}.result-section.hidden{display:none}.result-section>label{display:block;font-size:.85rem;font-weight:500;margin-bottom:6px}.totp-display{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;text-align:center}.totp-code{display:block;width:100%;font-family:var(--mono);font-size:2.5rem;font-weight:700;letter-spacing:.15em;color:var(--text);padding:8px}.totp-copy-btn{position:static;margin:8px auto 0}.totp-timer-bar{height:4px;background:var(--border);border-radius:2px;margin:12px 0 8px;overflow:hidden}.totp-progress{height:100%;background:var(--accent);border-radius:2px;transition:width 1s linear,background-color .3s}.totp-progress.urgent{background:var(--warning)}.totp-progress.critical{background:var(--error)}.totp-remaining{font-size:.8rem;color:var(--text-dim)}.divider{border:none;border-top:1px solid var(--border);margin:20px 0}.hint{color:var(--text-dim);font-size:.8rem;margin-bottom:16px}footer{text-align:center;padding:24px 0;color:var(--text-dim);font-size:.75rem;border-top:1px solid var(--border);max-width:560px;margin:0 auto}.btn .spinner{display:inline-block;width:16px;height:16px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite;margin-right:8px}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:480px){header h1{font-size:1.4rem}.totp-code{font-size:2rem}.btn{padding:12px 16px}}