:root{--text:#6b6375;--text-h:#08060d;--bg:#fff;--border:#e5e4e7;--code-bg:#f4f3ec;--surface:#fffc;--surface-strong:#fff;--surface-soft:#f8fafc;--accent:#aa3bff;--accent-bg:#aa3bff1a;--accent-border:#aa3bff80;--social-bg:#f4f3ec80;--shadow:#0000001a 0 10px 15px -3px, #0000000d 0 4px 6px -2px;--sans:system-ui, "Segoe UI", Roboto, sans-serif;--heading:system-ui, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, Consolas, monospace;font:18px/145% var(--sans);letter-spacing:.18px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}@media (width<=1024px){:root{font-size:16px}}@media (prefers-color-scheme:dark){:root{--text:#94a3b8;--text-h:#f8fafc;--bg:#0f1117;--border:#2a3140;--code-bg:#171b24;--surface:#171b24;--surface-strong:#1d2430;--surface-soft:#131924;--accent:#c084fc;--accent-bg:#c084fc2e;--accent-border:#c084fc66;--social-bg:#171b24d9;--shadow:#00000073 0 10px 15px -3px, #0000004d 0 4px 6px -2px}#social .button-icon{filter:invert()brightness(2)}}body{margin:0}#root{text-align:center;border-inline:1px solid var(--border);box-sizing:border-box;flex-direction:column;width:1126px;max-width:100%;min-height:100svh;margin:0 auto;display:flex}h1,h2{font-family:var(--heading);color:var(--text-h);font-weight:500}h1{letter-spacing:-1.68px;margin:32px 0;font-size:56px}@media (width<=1024px){h1{margin:20px 0;font-size:36px}}h2{letter-spacing:-.24px;margin:0 0 8px;font-size:24px;line-height:118%}@media (width<=1024px){h2{font-size:20px}}p{margin:0}code,.counter{font-family:var(--mono);color:var(--text-h);border-radius:4px;display:inline-flex}code{background:var(--code-bg);padding:4px 8px;font-size:15px;line-height:135%}.app-shell{padding:12px 12px calc(16px + env(safe-area-inset-bottom));text-align:left;flex-direction:column;gap:12px;display:flex}.topbar{justify-content:space-between;align-items:flex-start;gap:16px;display:flex}.status-row{flex-wrap:wrap;align-items:center;gap:8px}.eyebrow{letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:8px;font-size:13px;font-weight:700}.subtitle{color:var(--text);max-width:32rem}.score-chip,.toggle,.status-chip{border:1px solid var(--border);background:var(--code-bg);color:var(--text-h);border-radius:999px;justify-content:center;align-items:center;font-size:13px;font-weight:600;display:inline-flex}.score-chip,.status-chip{white-space:nowrap;padding:8px 12px}.settings-panel{flex-wrap:wrap;gap:10px;display:flex}.toggle{padding:8px 12px}.toggle-active{background:var(--accent-bg);border-color:var(--accent-border)}.progress-card,.prompt-card,.feedback-card,.state-card{border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);border-radius:20px}.progress-card,.state-card{padding:12px}.progress-copy{color:var(--text-h);justify-content:space-between;gap:12px;margin-bottom:8px;font-size:14px;display:flex}.progress-track{background:var(--code-bg);border-radius:999px;width:100%;height:6px;overflow:hidden}.progress-fill{border-radius:inherit;background:linear-gradient(90deg, var(--accent), #7c3aed);height:100%}.card-stack{flex-direction:column;gap:12px;display:flex}.prompt-card{text-align:center;padding:16px 14px}.prompt-heading{justify-content:center;align-items:center;gap:12px;display:flex}.prompt-label{color:var(--text);margin-bottom:6px;font-size:13px}.prompt-value{margin-bottom:4px;font-size:clamp(1.7rem,6vw,3rem);line-height:1.05}.prompt-meta{color:var(--text);font-size:14px}.options-grid{grid-template-columns:1fr;gap:10px;display:grid}.option-row{border:1px solid var(--border);background:var(--surface-soft);border-radius:18px;align-items:stretch;gap:10px;width:100%;display:flex;overflow:hidden}.option-row-with-audio{align-items:stretch;gap:0}.option-button,.primary-button{appearance:none;border:1px solid var(--border);min-height:56px;font:inherit;color:var(--text-h);background:var(--surface-soft);border-radius:18px;padding:14px;font-weight:600}.option-button{text-align:left;background:0 0;border:none;border-radius:0;flex:1}.audio-button{border:none;border-left:1px solid var(--border);width:56px;min-width:56px;min-height:56px;color:var(--text-h);font:inherit;background:0 0;border-radius:0;flex:none;justify-content:center;align-items:center;padding:0;font-weight:700;display:inline-flex}.audio-button-circle{background:var(--accent-bg);width:34px;height:34px;color:var(--accent);border-radius:999px;justify-content:center;align-items:center;font-size:16px;line-height:1;display:inline-flex}.audio-button:disabled .audio-button-circle{background:#c084fc3d}.option-idle{background:0 0}.option-correct{background:#22c55e2e;border-color:#4ade806b}.option-incorrect{background:#ef444429;border-color:#f8717161}.option-row:has(.option-correct){background:#22c55e2e;border-color:#4ade806b}.option-row:has(.option-incorrect){background:#ef444429;border-color:#f8717161}.option-button:disabled{opacity:1}.feedback-card{justify-content:space-between;align-items:center;gap:12px;padding:14px;display:flex}.feedback-title{color:var(--text-h);margin-bottom:4px;font-weight:700}.feedback-detail{color:var(--text)}.feedback-answer-row{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.feedback-visible{border-color:var(--accent-border)}.primary-button{background:var(--accent);border-color:var(--accent);color:#fff;white-space:nowrap;min-height:54px;padding-inline:18px}.bottom-action-bar{bottom:calc(env(safe-area-inset-bottom) + 8px);margin-top:4px;padding-bottom:0;position:sticky}.bottom-action-button{width:100%;box-shadow:var(--shadow)}.reinforcement-banner{color:var(--text-h);background:#22c55e29;border-radius:999px;align-self:center;padding:12px 18px;font-weight:700;position:sticky;bottom:0}.audio-error{color:#b91c1c;margin:0;font-size:14px}button{cursor:pointer;-webkit-tap-highlight-color:transparent;touch-action:manipulation}button:focus-visible{outline:3px solid var(--accent);outline-offset:2px}@media (width<=640px){.topbar,.feedback-card{flex-direction:column;align-items:stretch}.status-row{flex-direction:row;justify-content:space-between;align-items:center}.score-chip,.toggle,.status-chip{min-height:36px}.primary-button{width:100%}.audio-button{width:52px;min-width:52px;min-height:52px}.prompt-card{padding:14px 12px}.feedback-card{padding:12px}.bottom-action-bar{bottom:calc(env(safe-area-inset-bottom) + 10px)}}