.mode-container {
    margin: 2rem 0;
    padding: 1.5rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    background: #fafafa;
}

.mode-controls {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.mode-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    font-weight: 500;
}

.mode-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.mode-button.active {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    box-shadow: 0 3px 10px rgba(240, 147, 251, 0.4);
}

.experiment-text {
    line-height: 1.8;
    font-size: 1.1rem;
    margin: 1.5rem 0;
    transition: all 0.5s ease;
}

/* Focus Mode - highlights key sentences */
.experiment-text.focus-mode .key-phrase {
    background: linear-gradient(120deg, #a8edea 0%, #fed6e3 100%);
    padding: 0.1em 0.3em;
    border-radius: 3px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.experiment-text.focus-mode .supporting-text {
    opacity: 0.6;
    transition: opacity 0.5s ease;
}

/* Overview Mode - dims details, emphasizes structure */
.experiment-text.overview-mode .detail {
    opacity: 0.3;
    font-size: 0.95em;
    transition: all 0.5s ease;
}

.experiment-text.overview-mode .structure {
    font-weight: 600;
    opacity: 1;
    color: #2c3e50;
}

/* Reading Mode - optimized contrast and spacing */
.experiment-text.reading-mode {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background: -webkit-linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 2rem;
    border-radius: 8px;
    color: #2c3e50;
    font-size: 1.15rem;
    line-height: 1.9;
}

.experiment-text.reading-mode .key-phrase {
    background: rgba(52, 152, 219, 0.15);
    padding: 0.1em 0.2em;
    border-radius: 3px;
}

/* Scan Mode - reduces everything to key points */
.experiment-text.scan-mode .supporting-text,
.experiment-text.scan-mode .detail {
    opacity: 0.1;
    transition: all 0.5s ease;
}

.experiment-text.scan-mode .key-phrase {
    display: block;
    background: linear-gradient(90deg, #4facfe 0%, #00f2fe 100%);
    color: white;
    padding: 0.5em 1em;
    margin: 0.5em 0;
    border-radius: 5px;
    font-weight: 600;
    transform: scale(1.05);
}

.accessibility-note {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    padding: 1rem;
    border-radius: 5px;
    margin: 1rem 0;
    font-size: 0.95rem;
}

.accessibility-note strong {
    color: #8b4513;
}

@media (max-width: 768px) {
    .mode-controls {
        justify-content: center;
    }

    .mode-button {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }

    .experiment-text {
        font-size: 1rem;
        line-height: 1.7;
    }

    .experiment-text.reading-mode {
        padding: 1.5rem;
        font-size: 1.05rem;
    }
}