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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

/* Screen Management */
.screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    transition: opacity 0.3s ease;
}

.screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.screen.active {
    opacity: 1;
    pointer-events: auto;
}

/* Onboarding Styles */
.onboarding-container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    padding: 30px;
    width: 100%;
    max-width: 500px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.onboarding-header {
    text-align: center;
    margin-bottom: 30px;
}

.onboarding-header h1 {
    font-size: 28px;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 8px;
}

.onboarding-header p {
    color: #718096;
    font-size: 16px;
}

.onboarding-step {
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.hidden {
    display: none !important;
}

/* Exercise Grid */
.exercise-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 30px;
}

.exercise-card {
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 16px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100px;
}

.exercise-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.exercise-card.selected {
    border-color: #667eea;
    background: #f7f8ff;
    color: #667eea;
    font-weight: 600;
}

.exercise-card .exercise-icon {
    font-size: 24px;
    margin-bottom: 8px;
}

.exercise-card .exercise-name {
    font-size: 14px;
    font-weight: 500;
}

/* Goals Container */
.goals-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 30px;
}

.goal-item {
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 16px;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.goal-item .exercise-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.goal-item .exercise-title {
    font-weight: 600;
    color: #2d3748;
}

.goal-item .exercise-subtitle {
    font-size: 12px;
    color: #718096;
}

.goal-input {
    display: flex;
    align-items: center;
    gap: 10px;
}

.goal-input input {
    width: 80px;
    padding: 8px 12px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 16px;
    text-align: center;
    outline: none;
    transition: border-color 0.3s ease;
}

.goal-input input:focus {
    border-color: #667eea;
}

/* Name Input */
.name-input-container {
    background: white;
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 30px;
}

.name-input-container label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #4a5568;
}

.name-input-container input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 16px;
    outline: none;
    transition: border-color 0.3s ease;
}

.name-input-container input:focus {
    border-color: #667eea;
}

/* Buttons */
.btn-primary, .btn-secondary {
    padding: 14px 24px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    width: 100%;
    margin-top: 10px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.6);
}

.btn-secondary {
    background: #f7fafc;
    color: #4a5568;
    border: 2px solid #e2e8f0;
}

.btn-secondary:hover {
    background: #edf2f7;
    border-color: #cbd5e0;
}

.step-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.step-actions .btn-primary {
    flex: 2;
}

.step-actions .btn-secondary {
    flex: 1;
}

/* Main App Styles */
.main-container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    padding: 30px;
    width: 100%;
    max-width: 500px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    animation: slideUp 0.5s ease-out;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e2e8f0;
}

.user-info h1 {
    font-size: 24px;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 4px;
}

.today-date {
    color: #718096;
    font-size: 14px;
}

/* Exercises List */
.section-title {
    font-size: 18px;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 15px;
}

.exercises-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 30px;
}

.exercise-item {
    background: white;
    border-radius: 16px;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 2px solid #e2e8f0;
    transition: all 0.3s ease;
}

.exercise-item.completed {
    border-color: #48bb78;
    background: #f0fff4;
}

.exercise-item .exercise-details {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.exercise-item .exercise-name {
    font-weight: 600;
    color: #2d3748;
}

.exercise-item .exercise-goal {
    font-size: 12px;
    color: #718096;
}

.exercise-item .exercise-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.exercise-item .count-display {
    font-weight: 700;
    font-size: 18px;
    min-width: 40px;
    text-align: center;
}

.exercise-item .btn-action {
    background: #667eea;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease;
}

.exercise-item .btn-action:hover {
    background: #5a67d8;
}

.exercise-item .btn-action:disabled {
    background: #a0aec0;
    cursor: not-allowed;
}

.exercise-item .btn-action.small {
    padding: 6px 12px;
    font-size: 14px;
    background: #48bb78;
}

.exercise-item .btn-action.small:hover {
    background: #38a169;
}

/* Progress Summary */
.progress-summary {
    background: white;
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 30px;
    border: 2px solid #e2e8f0;
}

.progress-stats {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
}

.stat {
    text-align: center;
    padding: 10px;
    background: #f7fafc;
    border-radius: 12px;
    flex: 1;
    margin: 0 5px;
}

.stat-label {
    display: block;
    font-size: 12px;
    color: #718096;
    margin-bottom: 4px;
}

.stat-value {
    font-size: 20px;
    font-weight: 700;
    color: #2d3748;
}

.progress-bar-container {
    display: flex;
    align-items: center;
    gap: 15px;
}

.progress-bar {
    flex: 1;
    height: 12px;
    background: #e2e8f0;
    border-radius: 999px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    font-weight: 700;
    color: #2d3748;
    min-width: 40px;
    text-align: right;
}

/* Calendar Styles */
.calendar-container {
    margin-bottom: 30px;
    overflow-x: auto;
    padding-bottom: 10px;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
    min-width: 300px;
}

.calendar-day {
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    padding: 8px;
    text-align: center;
    font-size: 11px;
    font-weight: 600;
    color: #4a5568;
    position: relative;
    min-height: 50px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.calendar-day.weekend {
    background: #f7fafc;
    color: #a0aec0;
}

.calendar-day.today {
    border-color: #667eea;
    background: #f7f8ff;
    color: #667eea;
    font-weight: 800;
}

.calendar-day.completed {
    border-color: #48bb78;
    background: #f0fff4;
}

.calendar-day .day-number {
    margin-bottom: 5px;
}

.calendar-day .progress-ring {
    width: 30px;
    height: 30px;
    position: relative;
}

.calendar-day .progress-ring svg {
    transform: rotate(-90deg);
}

.calendar-day .progress-ring circle.bg {
    fill: none;
    stroke: #e2e8f0;
    stroke-width: 4;
}

.calendar-day .progress-ring circle.progress {
    fill: none;
    stroke: #667eea;
    stroke-width: 4;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.3s ease;
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
}

.calendar-day.completed .progress-ring circle.progress {
    stroke: #48bb78;
}

.calendar-day .completion-text {
    font-size: 10px;
    margin-top: 4px;
    font-weight: 700;
}

/* Daily Stats */
.daily-stats {
    background: white;
    border-radius: 16px;
    padding: 20px;
    text-align: center;
    border: 2px solid #e2e8f0;
}

.daily-stats h3 {
    color: #718096;
    font-size: 14px;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.streak-container {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 8px;
}

.streak-number {
    font-size: 48px;
    font-weight: 800;
    color: #667eea;
}

.streak-label {
    font-size: 16px;
    color: #718096;
    font-weight: 600;
}

/* Responsive Design */
@media (max-width: 480px) {
    .exercise-grid {
        grid-template-columns: 1fr;
    }
    
    .exercise-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .exercise-item .exercise-actions {
        align-self: flex-end;
    }
    
    .progress-stats {
        flex-direction: column;
        gap: 10px;
    }
    
    .stat {
        margin: 0;
    }
    
    .progress-bar-container {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .progress-text {
        align-self: flex-end;
        width: 100%;
    }
}

/* Animation for exercise completion */
@keyframes pop {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.exercise-item.completing {
    animation: pop 0.3s ease-in-out;
}

/* Loading states */
.loading {
    opacity: 0.5;
    pointer-events: none;
}

/* Success message */
.success-message {
    background: #f0fff4;
    border: 2px solid #48bb78;
    color: #2f855a;
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 20px;
    text-align: center;
    font-weight: 600;
    display: none;
}