:root{--color-primary: #4f8cff;--color-primary-light: #e8f0ff;--color-correct: #22c55e;--color-correct-light: #dcfce7;--color-wrong: #ef4444;--color-wrong-light: #fee2e2;--color-bg: #f5f7fa;--color-card: #ffffff;--color-text: #1e293b;--color-text-secondary: #64748b;--color-border: #e2e8f0;--radius: 12px;--radius-sm: 8px;--shadow: 0 2px 8px rgba(0, 0, 0, .06);--shadow-hover: 0 4px 16px rgba(0, 0, 0, .1)}*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-tap-highlight-color:transparent}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--color-bg);color:var(--color-text);line-height:1.6;min-height:100dvh}.app-container{max-width:480px;margin:0 auto;min-height:100dvh;background:var(--color-bg);position:relative}.page{padding:20px 16px 32px;min-height:100dvh}.nav-header{display:flex;align-items:center;gap:12px;margin-bottom:24px}.nav-back{width:36px;height:36px;border:none;background:var(--color-card);border-radius:50%;font-size:18px;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);color:var(--color-text);flex-shrink:0}.nav-title{font-size:1.1rem;font-weight:600}.card{background:var(--color-card);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.card-clickable{cursor:pointer;transition:transform .15s,box-shadow .15s}.card-clickable:active{transform:scale(.98);box-shadow:var(--shadow-hover)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:none;border-radius:var(--radius-sm);font-size:1rem;font-weight:500;cursor:pointer;min-height:44px;padding:10px 24px;transition:background .15s,transform .1s}.btn:active{transform:scale(.97)}.btn-primary{background:var(--color-primary);color:#fff}.btn-outline{background:transparent;border:1.5px solid var(--color-primary);color:var(--color-primary)}.btn-block{width:100%}.btn-lg{min-height:52px;font-size:1.05rem;border-radius:var(--radius)}.fade-enter-active,.fade-leave-active{transition:opacity .2s ease}.fade-enter-from,.fade-leave-to{opacity:0}.text-center{text-align:center}.mt-8{margin-top:8px}.mt-12{margin-top:12px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mb-16{margin-bottom:16px}