:root {
    --primary-color: #6366f1;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --info-color: #06b6d4;
    --warning-color: #f59e0b;
    
    /* Dark mode colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #475569;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    padding-bottom: 80px;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
}

/* Page Navigation */
.page {
    display: none;
}

.page.active {
    display: block;
}

/* Navbar */
.navbar {
    background-color: var(--bg-secondary) !important;
    box-shadow: 0 2px 8px rgba(0,0,0,.3);
    border-bottom: 1px solid var(--border-color);
}

.nav-link {
    cursor: pointer;
    transition: all 0.3s;
    color: var(--text-secondary) !important;
}

.nav-link:hover, .nav-link.active {
    background-color: rgba(99, 102, 241, 0.2);
    color: var(--text-primary) !important;
}

/* Cards */
.card {
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0,0,0,.3);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.card-header {
    border-bottom: 1px solid var(--border-color);
}

.card-body {
    background-color: var(--bg-secondary);
}

/* Checklist Items */
.checklist-item {
    display: flex;
    align-items: center;
    padding: 12px;
    margin-bottom: 8px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.checklist-item:hover {
    background-color: var(--bg-secondary);
    box-shadow: 0 2px 8px rgba(0,0,0,.2);
    transform: translateY(-1px);
}

.checklist-item.completed {
    background-color: rgba(16, 185, 129, 0.15);
    border-color: var(--success-color);
    opacity: 0.7;
}

.checklist-item.completed .checklist-text {
    text-decoration: line-through;
    color: var(--text-secondary);
}

.checklist-checkbox {
    width: 24px;
    height: 24px;
    margin-right: 12px;
    cursor: pointer;
}

.checklist-text {
    flex: 1;
    font-size: 16px;
    margin: 0;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.checklist-text .badge {
    font-size: 11px;
    font-weight: 600;
    padding: 4px 8px;
}

/* Forms */
.form-control, .form-select {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.form-control:focus, .form-select:focus {
    background-color: var(--bg-tertiary);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(99, 102, 241, 0.25);
    color: var(--text-primary);
}

.form-control::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.form-label {
    color: var(--text-primary);
}

.btn {
    font-weight: 500;
    transition: all 0.3s;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,.2);
}

/* History Items */
.history-item {
    padding: 12px;
    margin-bottom: 8px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
    color: var(--text-primary);
}

.history-item .date {
    font-weight: bold;
    color: var(--primary-color);
}

.history-item .delete-btn {
    float: right;
    color: var(--danger-color);
    cursor: pointer;
    font-size: 18px;
    transition: all 0.3s;
}

.history-item .delete-btn:hover {
    color: #dc2626;
    transform: scale(1.1);
}

/* Chart Container */
canvas {
    max-height: 400px;
}

/* Responsive */
@media (max-width: 768px) {
    .card-body {
        padding: 1rem;
    }
    
    .checklist-item {
        padding: 10px;
    }
    
    .checklist-text {
        font-size: 14px;
    }
}

/* Loading State */
.loading {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

/* Progress Cards */
.progress-card {
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    border: 1px solid var(--border-color);
    padding: 20px;
    margin-bottom: 15px;
}

.progress-label {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 8px;
}

.progress-value {
    color: var(--text-primary);
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 10px;
}

.progress-bar {
    height: 8px;
    background-color: var(--bg-primary);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--info-color));
    transition: width 0.3s ease;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.stat-card {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 15px;
    text-align: center;
}

.stat-value {
    font-size: 28px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.text-muted {
    color: var(--text-secondary) !important;
    opacity: 0.8;
}

/* Motivation Card */
.motivation-card {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%);
    border: 2px solid var(--primary-color);
    padding: 20px;
    margin: 0 auto;
    max-width: 600px;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

.motivation-icon {
    color: var(--primary-color);
    font-size: 28px;
    margin-bottom: 12px;
    display: block;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

.motivation-card p {
    font-size: 18px;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.6;
}

/* Workout Statistics */
.workout-stat-card {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 15px;
}

.workout-stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.workout-stat-value {
    font-size: 20px;
    font-weight: bold;
    color: var(--primary-color);
}

.workout-stats-divider {
    border-top: 1px solid var(--border-color);
}

/* Input Groups */
.input-group-text {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

/* Buttons in dark mode */
.btn-outline-primary {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.btn-success {
    background-color: var(--success-color);
    border-color: var(--success-color);
}

.btn-success:hover {
    background-color: #059669;
    border-color: #059669;
}