gym-tracker/frontend/styles.css

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding: 20px 0;
    border-bottom: 2px solid #e0e0e0;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: #2c3e50;
}

.balance-indicator {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.balance-emoji {
    font-size: 2rem;
}

.balance-text {
    font-size: 1rem;
    font-weight: 500;
    color: #555;
}

/* Action Bar */
.action-bar {
    margin-bottom: 30px;
    text-align: center;
}

/* Buttons */
.btn-primary {
    background: #4CAF50;
    color: white;
    border: none;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.btn-primary:hover {
    background: #45a049;
}

.btn-secondary {
    background: #6c757d;
    color: white;
    border: none;
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.btn-secondary:hover {
    background: #5a6268;
}

/* Heatmap Section */
.heatmap-section {
    background: white;
    padding: 30px;
    margin-bottom: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.heatmap-section h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #2c3e50;
}

.heatmap-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.heatmap-container {
    overflow-x: auto;
}

/* Muscle Groups Section */
.muscle-groups-section {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.muscle-groups-section h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #2c3e50;
}

.muscle-groups-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

/* Muscle Group Card */
.muscle-card {
    background: #f9f9f9;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #ccc;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.muscle-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.muscle-card.status-good {
    border-left-color: #4CAF50;
}

.muscle-card.status-warning {
    border-left-color: #FFC107;
}

.muscle-card.status-bad {
    border-left-color: #F44336;
}

.muscle-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.muscle-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: #2c3e50;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.status-indicator.good {
    background: #4CAF50;
}

.status-indicator.warning {
    background: #FFC107;
}

.status-indicator.bad {
    background: #F44336;
}

.muscle-card-stats {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
}

.stat-label {
    color: #666;
}

.stat-value {
    font-weight: 600;
    color: #333;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: white;
    padding: 0;
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #e0e0e0;
}

.modal-header h3 {
    font-size: 1.3rem;
    color: #2c3e50;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.8rem;
    color: #999;
    cursor: pointer;
    line-height: 1;
}

.close-btn:hover {
    color: #333;
}

/* Form */
#sessionForm {
    padding: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-group input[type="date"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.checkbox-group {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px;
    background: #f5f5f5;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s ease;
}

.checkbox-label:hover {
    background: #e8e8e8;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.checkbox-label span {
    font-size: 0.95rem;
    color: #333;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 24px;
}

/* Loading Indicator */
.loading-indicator {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.3);
    justify-content: center;
    align-items: center;
}

.loading-indicator.active {
    display: flex;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #4CAF50;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    .header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .muscle-groups-grid {
        grid-template-columns: 1fr;
    }

    .checkbox-group {
        grid-template-columns: 1fr;
    }

    .heatmap-section,
    .muscle-groups-section {
        padding: 15px;
    }
}

/* Cal-Heatmap Overrides */
.cal-heatmap-container {
    font-family: inherit;
}

.cal-heatmap-container .graph-label {
    fill: #666;
    font-size: 12px;
}

.cal-heatmap-container rect.highlight {
    stroke: #4CAF50;
    stroke-width: 2;
}