:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --card-bg: #f5f5f5;
    --border-color: #dddddd;
    --primary-color: #007bff;
    --exercise-bg: #f9f9f9;
    --volume-color: #666666;
}

.dark-mode {
    --bg-color: #333333;
    --text-color: #ffffff;
    --card-bg: #444444;
    --border-color: #555555;
    --primary-color: #0066cc;
    --exercise-bg: #3a3a3a;
    --volume-color: #cccccc;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.workout-form, .workout-list, .workout-history, .settings-form {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 5px;
}

input, select, button {
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

button {
    background-color: var(--primary-color);
    color: #ffffff;
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin: 5px 0;
}

button:hover {
    background-color: var(--primary-color);
    opacity: 0.9;
}

.exercise-item {
    margin: 10px 0;
    padding: 10px;
    background-color: var(--exercise-bg);
    border-radius: 4px;
}

.workout-entry {
    margin: 15px 0;
    padding: 15px;
    background-color: #f0f0f0;
    border-radius: 4px;
}

.navbar {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 5px;
}

.navbar a {
    text-decoration: none;
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 3px;
}

.navbar a.active {
    background-color: var(--primary-color);
    color: #ffffff;
}

.settings-form {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

.setting-item {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.setting-item label {
    min-width: 120px;
}

.dark-mode {
    background-color: #333;
    color: #fff;
}

.dark-mode .navbar {
    background-color: #444;
}

.dark-mode .navbar a {
    color: #fff;
}

.exercise-input {
    display: flex;
    gap: 10px;
    margin-bottom: 1rem;
}

.exercise-input input {
    flex: 1;
}

.default-exercises {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 0.5rem;
    margin-bottom: 1rem;
}

.default-exercise-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    margin: 5px 0;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.default-exercise-item:last-child {
    border-bottom: none;
}

.default-exercise-item button {
    padding: 0.25rem 0.5rem;
    background-color: #dc3545;
}

.exercise-select-container {
    position: relative;
    margin-bottom: 1rem;
}

.new-exercise-input {
    margin-top: 0.5rem;
    display: flex;
    gap: 0.5rem;
}

.new-exercise-input.hidden {
    display: none;
}

.new-exercise-input input {
    flex: 1;
}

.new-exercise-input button {
    padding: 0.25rem 0.5rem;
}

.workout-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.workout-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.workout-date {
    color: var(--text-color);
    opacity: 0.7;
    font-size: 0.9rem;
}

.exercises-container {
    margin: 1rem 0;
}

.exercise-item {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--exercise-bg);
}

.exercise-item:last-child {
    border-bottom: none;
}

.exercise-item p {
    margin: 0.25rem 0;
}

.volume {
    font-size: 0.9rem;
    color: var(--volume-color);
    opacity: 0.8;
}

.workout-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.total-volume {
    font-weight: bold;
    font-size: 1.1rem;
}

.workout-actions {
    display: flex;
    gap: 0.5rem;
}

.edit-btn, .delete-btn {
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
}

.edit-btn {
    background-color: var(--primary-color);
}

.delete-btn {
    background-color: #dc3545;
}

.save-button {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin-top: 20px;
}

.delete-button {
    padding: 5px 10px;
    background-color: #dc3545;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.primary-button {
    padding: 5px 10px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}