.hero { padding: 4rem 0 3rem; margin-top: 1.5rem; text-align: center; background: var(--color-primary); color: white; }
        .hero h1 { font-size: 2.25rem; margin-bottom: 0.75rem; }
        .hero p { font-size: 1.05rem; opacity: 0.95; max-width: 900px; margin: 0 auto; }
        .section { padding: 2.5rem 0; }
        .exercise-container { max-width: 800px; margin: 2rem auto; }
        .exercise-card { padding: 2rem; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); margin-bottom: 1.5rem; }
        .exercise-number { display: inline-block; padding: 0.4rem 0.8rem; background: var(--color-primary); color: white; border-radius: var(--radius-md); font-size: 0.85rem; font-weight: 600; margin-bottom: 1rem; }
        .pair-container { margin: 2rem 0; }
        .pair-item { padding: 1.5rem; background: white; border: 2px solid var(--color-border); border-radius: var(--radius-lg); margin-bottom: 1rem; display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
        .pair-item.selected { border-color: var(--color-primary); background: rgba(99, 102, 241, 0.05); }
        .pair-text { font-size: 1.3rem; font-weight: 600; flex: 1; }
        .pair-btn { padding: 0.75rem 1.5rem; background: var(--color-primary); color: white; border: none; border-radius: var(--radius-md); cursor: pointer; font-weight: 600; transition: var(--transition-fast); }
        .pair-btn:hover { background: #4f46e5; }
        .controls { display: flex; gap: 0.75rem; margin: 1.5rem 0; flex-wrap: wrap; }
        .btn { padding: 0.75rem 1.5rem; border: none; border-radius: var(--radius-md); cursor: pointer; font-weight: 600; transition: var(--transition-fast); }
        .btn-primary { background: var(--color-primary); color: white; }
        .btn-primary:hover { background: #4f46e5; }
        .btn-secondary { background: white; border: 1px solid var(--color-border); color: var(--color-text-primary); }
        .btn-secondary:hover { background: var(--color-surface-alt); }
        .feedback { margin-top: 1.5rem; padding: 1rem; border-radius: var(--radius-md); text-align: center; display: none; font-weight: 600; }
        .feedback.correct { background: rgba(34, 197, 94, 0.1); color: #16a34a; display: block; }
        .feedback.incorrect { background: rgba(239, 68, 68, 0.1); color: #dc2626; display: block; }
        .nav-exercises { display: flex; justify-content: space-between; margin-top: 2rem; gap: 1rem; }
        .nav-btn { padding: 0.75rem 1.25rem; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); text-decoration: none; color: var(--color-text-primary); font-weight: 600; transition: var(--transition-fast); }
        .nav-btn:hover { border-color: var(--color-primary); background: white; }
        .nav-btn:disabled { opacity: 0.5; cursor: not-allowed; }
        .score-display { text-align: center; padding: 1rem; background: var(--color-surface); border-radius: var(--radius-md); margin-bottom: 1.5rem; }
        .score-display p { margin: 0; color: var(--color-text-secondary); }
        .score-display strong { font-size: 1.5rem; color: var(--color-primary); }
        @media (max-width: 768px) { .hero h1 { font-size: 1.6rem; } .pair-item { flex-direction: column; } .controls { flex-direction: column; } .btn { width: 100%; } }

.pc-auto-3afcc48a { margin-top: 3rem; padding: 2rem; background: #f8f9fa; border-radius: var(--radius-lg); }

.pc-auto-16e4de2a { margin-top: 0; color: var(--color-primary); }

.pc-auto-a0e91507 { color: var(--color-text-secondary); }

.pc-auto-685265ac { color: var(--color-primary); font-weight: 600; }

.pc-auto-c42e0ec4 { margin-bottom: 0; }

.pc-auto-81dcfb62 { display: inline-block; padding: 0.75rem 1.5rem; background: var(--color-primary); color: white; border-radius: var(--radius-md); text-decoration: none; font-weight: 600; transition: background 0.3s; }

.pc-auto-a699440a { margin-top: 2rem; padding: 2rem; background: white; border: 1px solid var(--color-border); border-radius: var(--radius-lg); }

.pc-auto-88aa25c3 { margin-top: 0; }

.pc-auto-23c7e5e0 { list-style: none; padding: 0; margin: 0; }

.pc-auto-77a3ec23 { margin-bottom: 0.75rem; }

.pc-auto-1fa82b68 { color: var(--color-primary); font-weight: 500; }

.pc-auto-b0046b87 { color: var(--color-text-secondary); margin: 0.5rem 0; }

.pc-auto-19a0b61e { color: var(--color-text-secondary); margin-bottom: 1rem; }

.pc-auto-12da645d { color: var(--color-text-secondary); margin-top: 1.5rem; margin-bottom: 0.5rem; }

.pc-auto-9aa36a05 { padding: 0.75rem; color: var(--color-text-secondary); }