/* Light Theme (default) */
.light-theme {
    background-color: #ffffff;
    color: #333333;
}

.light-theme .tab-btn {
    color: #333333;
}

.light-theme .primary-btn {
    background-color: #4a90e2;
}

.light-theme .control-btn {
    background-color: #f2f2f2;
    color: #333333;
}

.light-theme .timer {
    background-color: #f2f2f2;
    color: #333333;
}

.light-theme .exercise-group-header {
    background-color: #f5f5f5;
    color: #333333;
}

.light-theme .exercise-item {
    border-bottom-color: #eeeeee;
}

/* Dark Theme */
.dark-theme {
    background-color: #222222;
    color: #f0f0f0;
}

.dark-theme .tab-btn {
    color: #f0f0f0;
}

.dark-theme .primary-btn {
    background-color: #2d6bc4;
}

.dark-theme .control-btn {
    background-color: #444444;
    color: #f0f0f0;
}

.dark-theme .timer {
    background-color: #333333;
    color: #f0f0f0;
}

.dark-theme .exercise-group-header {
    background-color: #333333;
    color: #f0f0f0;
}

.dark-theme .exercise-group {
    border-color: #444444;
}

.dark-theme .exercise-item {
    border-bottom-color: #444444;
}

.dark-theme .slider {
    background-color: #444444;
}