/* CSS Variables for theming */
:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #6b7280;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --background-color: #f3f4f6;
    --card-background: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 8px;
    --transition: all 0.2s ease;
}

/* 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-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #7c3aed 100%);
    color: white;
    padding: 2rem;
    text-align: center;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.subtitle {
    opacity: 0.9;
    font-size: 1rem;
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
}

/* Card Styles */
.card {
    background: var(--card-background);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* Form Styles */
.task-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group textarea {
    min-height: 80px;
    resize: vertical;
}

/* Button Styles */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

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

.btn-secondary {
    background-color: var(--background-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-secondary.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #dc2626;
}

.btn-sm {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
}

/* Section Header */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}

.section-header h2 {
    margin-bottom: 0;
}

.filter-controls {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-controls select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.875rem;
}

/* Task List Styles */
.task-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.task-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background-color: var(--background-color);
    border-radius: var(--radius);
    border-left: 4px solid var(--secondary-color);
    transition: var(--transition);
}

.task-item:hover {
    box-shadow: var(--shadow);
}

.task-item.priority-high {
    border-left-color: var(--danger-color);
}

.task-item.priority-medium {
    border-left-color: var(--warning-color);
}

.task-item.priority-low {
    border-left-color: var(--success-color);
}

.task-item.status-completed {
    opacity: 0.7;
}

.task-item.status-completed .task-name {
    text-decoration: line-through;
}

.task-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.task-info {
    flex: 1;
    min-width: 0;
}

.task-name {
    font-weight: 500;
    margin-bottom: 0.25rem;
    word-break: break-word;
}

.task-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.task-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.task-badge {
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-category {
    background-color: #e0e7ff;
    color: #4338ca;
}

.badge-status {
    background-color: #fef3c7;
    color: #92400e;
}

.badge-status.completed {
    background-color: #d1fae5;
    color: #065f46;
}

.badge-status.in-progress {
    background-color: #dbeafe;
    color: #1e40af;
}

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

.task-actions button {
    padding: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    border-radius: var(--radius);
}

.task-actions button:hover {
    color: var(--primary-color);
    background-color: rgba(79, 70, 229, 0.1);
}

.task-actions .delete-btn:hover {
    color: var(--danger-color);
    background-color: rgba(239, 68, 68, 0.1);
}

.empty-message {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
}

/* Progress Section */
.progress-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    text-align: center;
    padding: 1rem;
    background-color: var(--background-color);
    border-radius: var(--radius);
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.progress-bar-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.progress-bar {
    flex: 1;
    height: 12px;
    background-color: var(--background-color);
    border-radius: 9999px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--success-color) 100%);
    border-radius: 9999px;
    transition: width 0.5s ease;
    width: 0%;
}

.progress-percentage {
    font-weight: 600;
    color: var(--primary-color);
    min-width: 45px;
}

/* Historical Section */
.historical-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.historical-card {
    padding: 1rem;
    background-color: var(--background-color);
    border-radius: var(--radius);
}

.historical-card h3 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.accuracy-meter {
    height: 8px;
    background-color: var(--border-color);
    border-radius: 9999px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.accuracy-fill {
    height: 100%;
    background-color: var(--success-color);
    transition: width 0.5s ease;
    width: 0%;
}

.big-stat {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.category-breakdown {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.category-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
}

.category-bar {
    flex: 1;
    height: 6px;
    background-color: var(--border-color);
    border-radius: 9999px;
    margin: 0 0.5rem;
    overflow: hidden;
}

.category-bar-fill {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 9999px;
}

/* Timeline Section */
.timeline-controls {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.timeline-container {
    min-height: 200px;
    overflow-x: auto;
}

.timeline {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 1rem 0;
}

.timeline-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    background-color: var(--background-color);
    border-radius: var(--radius);
    position: relative;
}

.timeline-date {
    min-width: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.timeline-bar {
    flex: 1;
    height: 24px;
    background-color: rgba(79, 70, 229, 0.2);
    border-radius: var(--radius);
    position: relative;
    overflow: hidden;
}

.timeline-bar-fill {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    padding: 0 0.5rem;
}

.timeline-task-name {
    font-size: 0.75rem;
    color: white;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.timeline-hours {
    min-width: 60px;
    text-align: right;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Data Management Section */
.data-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card-background);
    border-radius: var(--radius);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

#edit-form {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 1rem;
}

/* Footer Styles */
.footer {
    background-color: var(--card-background);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    text-align: center;
}

.footer p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.footer a:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: 1.5rem 1rem;
    }

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

    .main-content {
        padding: 1rem;
    }

    .card {
        padding: 1rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .filter-controls {
        width: 100%;
    }

    .filter-controls select {
        flex: 1;
    }

    .task-item {
        flex-wrap: wrap;
    }

    .task-info {
        width: 100%;
        order: 1;
    }

    .task-checkbox {
        order: 0;
    }

    .task-actions {
        order: 2;
        width: 100%;
        justify-content: flex-end;
        margin-top: 0.5rem;
        padding-top: 0.5rem;
        border-top: 1px solid var(--border-color);
    }

    .progress-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .historical-stats {
        grid-template-columns: 1fr;
    }

    .timeline-controls {
        flex-wrap: wrap;
    }

    .data-actions {
        flex-direction: column;
    }

    .data-actions .btn {
        width: 100%;
    }

    .modal-content {
        max-height: 85vh;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.25rem;
    }

    .subtitle {
        font-size: 0.875rem;
    }

    .stat-value {
        font-size: 1.25rem;
    }

    .btn {
        padding: 0.625rem 1rem;
        font-size: 0.875rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.task-item {
    animation: fadeIn 0.3s ease;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-color);
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}