* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.header h1 i {
    font-size: 2.2rem;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

.progress-section {
    padding: 30px;
    background: #f8fafc;
    border-bottom: 1px solid #e2e8f0;
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: #e2e8f0;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 15px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #10b981 0%, #059669 100%);
    border-radius: 10px;
    transition: width 0.5s ease;
    width: 0%;
    box-shadow: 0 2px 4px rgba(16, 185, 129, 0.3);
}

.progress-text {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: #374151;
}

#progressText {
    font-size: 1.2rem;
    color: #059669;
}

#taskCount {
    font-size: 0.9rem;
    color: #6b7280;
}

.checklist-container {
    padding: 30px;
}

.category {
    margin-bottom: 35px;
}

.category:last-child {
    margin-bottom: 0;
}

.category h2 {
    font-size: 1.4rem;
    font-weight: 600;
    color: #374151;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e5e7eb;
}

.category h2 i {
    color: #4f46e5;
    font-size: 1.2rem;
}

.task-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.task-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px 20px;
    background: white;
    border-radius: 12px;
    border: 2px solid #e5e7eb;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.task-item:hover {
    border-color: #4f46e5;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 70, 229, 0.15);
}

.task-item.completed {
    background: linear-gradient(135deg, #ecfdf5 0%, #f0fdf4 100%);
    border-color: #10b981;
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.2);
}

.task-checkbox {
    display: none;
}

.checkmark {
    width: 24px;
    height: 24px;
    border: 2px solid #d1d5db;
    border-radius: 6px;
    position: relative;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.task-item:hover .checkmark {
    border-color: #4f46e5;
}

.task-checkbox:checked + .checkmark {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    border-color: #10b981;
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.task-checkbox:checked + .checkmark::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 2px;
    width: 6px;
    height: 12px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.task-text {
    font-size: 1rem;
    font-weight: 500;
    color: #374151;
    transition: all 0.3s ease;
    flex: 1;
    line-height: 1.5;
}

.task-item.completed .task-text {
    color: #059669;
    text-decoration: line-through;
    opacity: 0.8;
}

.actions {
    padding: 30px;
    background: #f8fafc;
    display: flex;
    gap: 15px;
    justify-content: center;
    border-top: 1px solid #e2e8f0;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 70, 229, 0.4);
}

.btn-secondary {
    background: white;
    color: #6b7280;
    border: 2px solid #e5e7eb;
}

.btn-secondary:hover {
    border-color: #d1d5db;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn-info {
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

.btn-info:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(6, 182, 212, 0.4);
}

.btn-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.btn-warning:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.4);
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        border-radius: 15px;
    }
    
    .header {
        padding: 20px;
    }
    
    .header h1 {
        font-size: 2rem;
        flex-direction: column;
        gap: 10px;
    }
    
    .progress-section,
    .checklist-container,
    .actions {
        padding: 20px;
    }
    
    .category h2 {
        font-size: 1.2rem;
    }
    
    .task-item {
        padding: 12px 15px;
    }
    
    .task-text {
        font-size: 0.9rem;
    }
    
    .actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.8rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .progress-section,
    .checklist-container,
    .actions {
        padding: 15px;
    }
    
    .task-item {
        padding: 10px 12px;
        gap: 12px;
    }
    
    .checkmark {
        width: 20px;
        height: 20px;
    }
    
    .task-checkbox:checked + .checkmark::after {
        left: 5px;
        top: 1px;
        width: 5px;
        height: 10px;
    }
}

/* Animation for progress bar */
@keyframes progressFill {
    from {
        width: 0%;
    }
    to {
        width: var(--progress-width);
    }
}

.progress-fill {
    animation: progressFill 0.8s ease-out;
}

/* Pulse animation for completed tasks */
@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.task-item.completed {
    animation: pulse 0.6s ease-out;
}

/* Loading state */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Success message */
.success-message {
    position: fixed;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    padding: 15px 20px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.success-message.show {
    transform: translateX(0);
}