:root{--bg:#191919;--surface:#232323;--surface-alt:#2c2c2c;--text:#d4d4d4;--text-muted:#737373;--accent:#e2a94f;--accent-dim:#e2a94f44;--accent-glow:#e2a94f22;--error:#e06c6c;--error-dim:#e06c6c44;--warning:#d4a04a;--border:#333;--font-mono:"JetBrains Mono", "Fira Code", "Cascadia Code", monospace;--transition-fast:.15s ease;--transition-normal:.3s ease}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-mono);background:var(--bg);color:var(--text);min-height:100vh}#app{flex-direction:column;gap:1rem;max-width:800px;min-height:100vh;margin:0 auto;padding:1.5rem;display:flex}#app-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding-bottom:.75rem;display:flex}#app-header h1{letter-spacing:.05em;color:var(--accent);font-size:1rem;font-weight:600}#mode-indicator{color:var(--text-muted);text-transform:uppercase;letter-spacing:.1em;transition:color var(--transition-normal);font-size:.75rem}#prompt-area{background:var(--surface);border:1px solid var(--border);transition:border-color var(--transition-normal), opacity var(--transition-normal);border-radius:6px;padding:1rem 1.25rem}#prompt-area.transitioning{opacity:0}#prompt-intent{transition:color var(--transition-normal);margin-bottom:.5rem;font-size:.95rem;font-weight:500}#prompt-explanation{color:var(--text-muted);font-size:.8rem;line-height:1.5}.prompt-example code{background:var(--surface-alt);color:var(--accent);border-radius:3px;padding:.15em .4em}#editor-area{border:1px solid var(--border);min-height:200px;transition:border-color var(--transition-normal);border-radius:6px;flex:1;overflow:hidden}#editor{height:100%}.cm-editor{height:100%;font-size:.95rem}.cm-editor .cm-scroller{font-family:var(--font-mono)}.cm-editor.cm-focused{outline:none}.cm-correct{-webkit-text-decoration:underline 2px var(--accent);text-decoration:underline 2px var(--accent);text-underline-offset:3px}.cm-incorrect{-webkit-text-decoration:underline 2px var(--error);text-decoration:underline 2px var(--error);text-underline-offset:3px}.cm-incomplete{-webkit-text-decoration:underline 2px var(--text-muted);text-decoration:underline 2px var(--text-muted);text-underline-offset:3px;text-decoration-style:dotted}#feedback-area{justify-content:space-between;align-items:center;gap:1rem;display:flex}#progress-rail{flex:1;gap:4px;display:flex}.rail-segment{flex-direction:column;flex:1;align-items:center;gap:4px;display:flex}.rail-segment:before{content:"";background:var(--border);width:100%;height:6px;transition:background var(--transition-fast), box-shadow var(--transition-normal);border-radius:3px;display:block}.rail-segment.correct:before{background:var(--accent)}.rail-segment.incorrect:before{background:var(--error)}.rail-segment.incomplete:before{background:var(--text-muted)}.rail-label{color:var(--text-muted);text-transform:lowercase;white-space:nowrap;transition:color var(--transition-fast);font-size:.6rem}.rail-segment.correct .rail-label{color:var(--accent)}.rail-segment.incorrect .rail-label{color:var(--error)}#prompt-intent.complete{color:var(--accent)}#editor-area.complete{border-color:var(--accent)}.rail-segment.complete-flash:before{background:var(--accent);box-shadow:0 0 8px var(--accent-glow);animation:.6s ease-out rail-pulse}@keyframes rail-pulse{0%{box-shadow:0 0 0px var(--accent-glow);transform:scaleY(1)}50%{box-shadow:0 0 12px var(--accent);transform:scaleY(1.5)}to{box-shadow:0 0 8px var(--accent-glow);transform:scaleY(1)}}.drill-fade-out{animation:fadeOut var(--transition-normal) forwards}.drill-fade-in{animation:fadeIn var(--transition-normal) forwards}@keyframes fadeOut{0%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(-4px)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.hint-info{color:var(--text-muted)}.hint-warning{color:var(--warning)}.hint-error{color:var(--error)}.cm-scaffold-static{color:var(--text-muted)}.cm-scaffold-blank{border-bottom:2px dashed var(--accent-dim)}#timer{color:var(--text-muted);font-variant-numeric:tabular-nums;transition:color var(--transition-fast);font-size:.8rem}#timer.complete{color:var(--accent)}#status-bar{border-top:1px solid var(--border);color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;gap:1.5rem;padding-top:.75rem;font-size:.7rem;display:flex}#shortcut-hint{color:var(--text-muted);opacity:.6;text-align:right;font-size:.65rem}