.tts-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

@media (min-width: 768px) {
    .tts-container {
        grid-template-columns: 3fr 2fr;
    }
}

/* Text Input Section */
.input-section {
    background: var(--card-bg);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.input-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.input-header label {
    font-weight: bold;
    color: var(--primary-color);
}

.char-count {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.text-area {
    width: 100%;
    min-height: 300px;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.6;
    resize: vertical;
    margin-bottom: 15px;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.text-area:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-color-light);
}

.quick-text-btns {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn-sm {
    padding: 5px 10px;
    font-size: 0.85rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    color: var(--text-primary);
    transition: all 0.2s;
}

.btn-sm:hover {
    background: var(--hover-bg);
    border-color: var(--primary-color);
}

/* Controls Section */
.controls-section {
    background: var(--card-bg);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    height: fit-content;
}

.control-group {
    margin-bottom: 20px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 14px;
}

.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.params-grid {
    display: grid;
    gap: 15px;
    background: var(--bg-secondary);
    padding: 15px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
}

.label-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.action-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 15px;
}

.btn {
    padding: 12px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.3s;
    font-weight: bold;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    filter: grayscale(100%);
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    grid-column: 1 / -1;
}

.btn-primary:hover:not(:disabled) {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--secondary-color, #6c757d);
    color: white;
}

.btn-danger {
    background: var(--danger-color, #dc3545);
    color: white;
}

.status-bar {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
}

.usage-guide {
    margin-top: 30px;
    padding: 20px;
    background: var(--card-bg);
    border-radius: var(--border-radius);
}

.usage-guide h3 {
    margin-bottom: 15px;
    color: var(--text-primary);
}

.usage-guide ul {
    padding-left: 20px;
    color: var(--text-secondary);
    line-height: 1.8;
}