.card, .exercise-card { 
    background: var(--card-bg); 
    padding: 2rem; 
    border-radius: 16px; 
    box-shadow: var(--shadow-md); 
    margin-bottom: 2rem; 
    border: 1px solid var(--border); 
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.exercise-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
    border-color: var(--primary);
}


input[type="text"] { 
    width: 100%; 
    padding: 1.2rem; 
    background: #0f172a;
    color: var(--text-main);
    border: 2px solid var(--border); 
    border-radius: 12px; 
    font-size: 1.1rem; 
    margin-bottom: 1.5rem; 
    outline: none;
    transition: all 0.3s ease;
}

input[type="text"]:focus { 
    border-color: var(--primary); 
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.2);
}

button { 
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white; 
    border: none; 
    padding: 1rem 2rem; 
    border-radius: 12px; 
    font-size: 1.1rem; 
    font-weight: 600;
    cursor: pointer; 
    transition: all 0.3s ease; 
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
}

button:hover { 
    transform: translateY(-2px); 
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.5);
    filter: brightness(1.1);
}

button:active {
    transform: translateY(1px);
}


.results {
    display: grid;
    gap: 1rem;
    margin: 2rem 0;
}

.results p { 
    margin: 0;
    background: rgba(15, 23, 42, 0.6); 
    padding: 1.2rem; 
    border-radius: 12px; 
    border-left: 4px solid var(--secondary);
    color: var(--text-main);
    font-family: monospace;
    font-size: 1.1rem;
}

.results strong {
    color: var(--secondary);
    margin-right: 10px;
    font-family: 'Inter', sans-serif;
}

#tree-canvas {
    border-radius: 12px;
    box-shadow: inset 0 0 20px rgba(0,0,0,0.1);
    border: 4px solid var(--border);
    transition: all 0.3s ease;
}

#tree-canvas:hover {
    border-color: var(--primary);
}


.ranking-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-top: 1rem;
    font-size: 1rem;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.ranking-table th, .ranking-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
    background: var(--card-bg);
}

.ranking-table th {
    background-color: rgba(15, 23, 42, 0.8);
    color: var(--text-muted);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
}

.ranking-table tr:last-child td {
    border-bottom: none;
}

.ranking-table tr:hover td {
    background-color: rgba(59, 130, 246, 0.05);
}


.hidden-section, .hidden-answer { display: none !important; }
.active-section { display: block; animation: scaleUp 0.5s cubic-bezier(0.16, 1, 0.3, 1); }

@keyframes scaleUp {
    from { opacity: 0; transform: scale(0.97) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.answer { 
    margin-top: 1.5rem; 
    padding-top: 1.5rem;
    border-top: 1px dashed var(--border);
}


@media (max-width: 768px) {
    .card, .exercise-card { 
        padding: 1.5rem; 
    }

  
    .ranking-table {
        display: block;             
        overflow-x: auto;           
        -webkit-overflow-scrolling: touch; 
        white-space: nowrap;        
    }

    .ranking-table th, .ranking-table td {
        padding: 0.8rem;            
        font-size: 0.9rem;          
    }
}