:root{--primary-50: #eff6ff;--primary-100: #dbeafe;--primary-300: #93c5fd;--primary-500: #3b82f6;--primary-700: #1d4ed8;--primary-900: #1e3a8a;--correct-50: #f0fdf4;--correct-200: #bbf7d0;--correct-500: #22c55e;--correct-700: #15803d;--hint-50: #fffbeb;--hint-200: #fde68a;--hint-500: #f59e0b;--hint-700: #b45309;--error-50: #fff1f2;--error-200: #fecdd3;--error-500: #f43f5e;--error-700: #be123c;--neutral-50: #f8fafc;--neutral-100: #f1f5f9;--neutral-300: #cbd5e1;--neutral-400: #94a3b8;--neutral-500: #64748b;--neutral-600: #475569;--neutral-700: #334155;--neutral-900: #0f172a;--text-primary: var(--neutral-900);--text-subdued: var(--neutral-600);--text-secondary: var(--neutral-300);--text-muted: var(--neutral-50);--background-primary: white;--background-secondary: var(--neutral-50);--border-primary: var(--neutral-300);--content-max-width: 1080px}.primary-text{color:var(--text-primary)}.subdued-text{color:var(--text-subdued)}.muted-text{color:var(--text-muted)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.btn-primary{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;background-color:var(--primary-700);color:#fff;border:none;border-radius:8px;font-size:13px;font-weight:500;font-family:inherit;cursor:pointer;transition:background-color .12s}.btn-primary:hover{background-color:var(--primary-900)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-primary:focus-visible{outline:2px solid var(--primary-500);outline-offset:2px}.btn-secondary{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;background-color:#fff;color:var(--text-primary);border:1px solid var(--border-primary);border-radius:8px;font-size:13px;font-weight:500;font-family:inherit;cursor:pointer;transition:background-color .12s}.btn-secondary:hover{background-color:var(--neutral-50)}.btn-secondary:focus-visible{outline:2px solid var(--primary-500);outline-offset:2px}.btn-text{display:inline-flex;align-items:center;gap:6px;padding:8px 4px;background:transparent;color:var(--text-subdued);border:none;border-radius:6px;font-size:13px;font-weight:500;font-family:inherit;cursor:pointer;transition:color .12s}.btn-text:hover{color:var(--text-primary)}.btn-text:focus-visible{outline:2px solid var(--primary-500);outline-offset:2px}img,svg{display:block;max-width:100%}h1,h2,h3,h4{margin-block-start:0;margin-block-end:0;margin-inline-start:0px;margin-inline-end:0px;font-weight:900}p{max-width:65ch}.section-title{font-size:18px;font-weight:900;color:var(--text-primary);margin:0}.meter{height:8px;border-radius:999px;background:var(--neutral-100);overflow:hidden}.meter-fill{height:100%;border-radius:999px;background:var(--primary-500);transition:width .3s ease}.meter-fill--mastered{background:var(--correct-500)}.badge{display:inline-flex;align-items:center;height:22px;padding:0 10px;border-radius:999px;font-size:10px;font-weight:700;letter-spacing:.08em}.badge--primary{background:var(--primary-100);color:var(--primary-700)}.badge--hint{background:var(--hint-50);color:var(--hint-700)}.badge--correct{background:var(--correct-50);color:var(--correct-700)}.button{border-radius:10px;padding:1rem 2rem;border:2px solid transparent;font-weight:700;width:fit-content;min-width:10rem;white-space:nowrap;cursor:pointer;text-decoration:none;font-size:1rem;font-family:Inter,Segoe UI,sans-serif;display:inline-flex;align-items:center;justify-content:center;gap:.5rem;text-align:center}.button.primary{color:var(--text-muted);background-color:var(--primary-500)}.button.primary:hover{background-color:var(--primary-700)}.button.secondary{background-color:var(--background-primary);border-color:var(--primary-100);color:var(--neutral-700)}.button.secondary:hover{background-color:var(--primary-50)}.button.tertiary{background-color:unset;color:var(--neutral-500)}.button.tertiary:hover{background-color:unset}.button.small{padding:.5rem 1rem;font-size:.875rem}.button.large{padding:1.5rem 3rem;font-size:1.25rem}.button.full-width{min-width:0}.button.option-card{display:flex;align-items:center;gap:1rem;width:100%;min-width:0;white-space:normal;text-align:left;padding:1rem 1.25rem;background-color:var(--background-primary);border-color:var(--border-primary);color:var(--text-primary);font-weight:400;transition:background-color .15s,border-color .15s}.button.option-card:hover{background-color:var(--primary-50);border-color:var(--primary-300)}.button.option-card:focus-visible{outline:2px solid var(--primary-500);outline-offset:2px}.button.option-card.featured{background-color:var(--primary-500);border-color:transparent;color:var(--text-muted)}.button.option-card.featured:hover{background-color:var(--primary-700)}.button.option-card:disabled{cursor:default;opacity:.7}.button.option-card:disabled:hover{background-color:var(--background-primary);border-color:var(--border-primary)}.h-100{height:100%}.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.w-100{width:100%}.flex{display:flex}.flex-column{display:flex;flex-direction:column}.flex-1{flex:1}.justify-between{justify-content:space-between}.align-center{align-items:center}.justify-center{justify-content:center}.text-center{text-align:center}.gap-1{gap:.25rem}.gap-2{gap:.5rem}.gap-3{gap:.75rem}.gap-4{gap:1rem}.p-0{padding:0}.p-1{padding:.25rem}.p-2{padding:.5rem}.p-3{padding:.75rem}.p-4{padding:1rem}.m-0{margin:0}.m-1{margin:.25rem}.m-2{margin:.5rem}.m-3{margin:.75rem}.m-4{margin:1rem}.mt-0{margin-top:0}.mt-1{margin-top:.25rem}.mt-2{margin-top:.5rem}.mt-3{margin-top:.75rem}.mt-4{margin-top:1rem}.f-14{font-size:14px}.f-16{font-size:16px}.f-18{font-size:18px}.f-36{font-size:36px}.w-900{font-weight:900}