/**
 * Task Planner Styles
 * Modern, clean design with smooth animations
 */

/* ============================================
   CSS Variables
   ============================================ */
:root {
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --primary-light: #BBDEFB;
    --success-color: #4CAF50;
    --danger-color: #f44336;
    --warning-color: #FF9800;
    --text-primary: #212121;
    --text-secondary: #757575;
    --text-light: #FFFFFF;
    --bg-primary: #FAFAFA;
    --bg-secondary: #FFFFFF;
    --bg-card: #FFFFFF;
    --border-color: #E0E0E0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: all 0.2s ease;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

/* ============================================
   App Container
   ============================================ */
.app-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================
   Header
   ============================================ */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    margin-bottom: 24px;
    border-bottom: 2px solid var(--border-color);
}

.app-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.header-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.points-badge {
    background: linear-gradient(135deg, var(--success-color), #2E7D32);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 600;
    margin-right: 8px;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-light);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

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

.btn-danger:hover {
    background: #D32F2F;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

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

.btn-small {
    padding: 6px 12px;
    font-size: 0.8rem;
}

.btn-add {
    background: linear-gradient(135deg, var(--success-color), #388E3C);
    color: white;
    font-weight: 600;
}

.btn-add:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.4);
}

.btn-icon-only {
    width: 36px;
    height: 36px;
    padding: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

.btn-icon-only:hover {
    background: var(--bg-primary);
    transform: scale(1.1);
}

.btn-icon-task {
    background: transparent;
    border: none;
    padding: 4px 8px;
    cursor: pointer;
    opacity: 0.6;
    transition: var(--transition);
}

.btn-icon-task:hover {
    opacity: 1;
}

.btn-close {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 4px;
    line-height: 1;
}

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

/* ============================================
   Stats Section
   ============================================ */
.stats-section {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.stats-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.stats-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.total-points {
    font-size: 1rem;
    color: var(--text-secondary);
}

.total-points span {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.25rem;
}

.chart-container {
    height: 200px;
    margin-bottom: 24px;
}

/* Tags Filter */
.tags-filter {
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.tags-filter h3 {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}

.tag-filter-btn {
    padding: 6px 14px;
    border: 2px solid var(--tag-color, var(--border-color));
    background: transparent;
    color: var(--tag-color, var(--text-primary));
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.tag-filter-btn:hover,
.tag-filter-btn.active {
    background: var(--tag-color, var(--primary-color));
    color: white;
}

/* ============================================
   Tasks Section
   ============================================ */
.tasks-section {
    flex: 1;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
}

.tasks-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.date-navigation {
    display: flex;
    align-items: center;
    gap: 12px;
}

.date-navigation h2 {
    font-size: 1.25rem;
    font-weight: 600;
    min-width: 150px;
    text-align: center;
}

/* Tasks List */
.tasks-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.task-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.task-item:hover {
    background: #EEEEEE;
    transform: translateX(4px);
}

.task-item.task-done {
    opacity: 0.7;
}

.task-item.task-done .task-title {
    text-decoration: line-through;
    color: var(--text-secondary);
}

.task-checkbox {
    width: 28px;
    height: 28px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    color: var(--success-color);
    font-weight: bold;
}

.task-checkbox:hover {
    border-color: var(--success-color);
    background: rgba(76, 175, 80, 0.1);
}

.task-item.task-done .task-checkbox {
    background: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

.task-content {
    flex: 1;
}

.task-title {
    font-weight: 500;
    margin-bottom: 4px;
}

.task-meta {
    display: flex;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.task-duration {
    display: flex;
    align-items: center;
    gap: 4px;
}

.task-points {
    color: var(--success-color);
    font-weight: 600;
}

.task-tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.75rem;
    color: white;
    margin-right: 4px;
}

.task-actions {
    display: flex;
    gap: 4px;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-secondary);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.empty-state p {
    margin-bottom: 20px;
}

/* ============================================
   Footer
   ============================================ */
.app-footer {
    padding: 16px 0;
    margin-top: 24px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.day-summary {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.day-summary strong {
    color: var(--text-primary);
}

.separator {
    margin: 0 12px;
    color: var(--border-color);
}

/* ============================================
   Modal Styles
   ============================================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    padding: 20px;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    transform: translateY(20px);
    transition: var(--transition);
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-large {
    max-width: 600px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="date"],
.form-group select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-group input[readonly] {
    background: var(--bg-primary);
    color: var(--text-secondary);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.points-hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 4px;
    display: block;
}

/* Checkbox */
.checkbox-group {
    display: flex;
    align-items: center;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-primary);
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--success-color);
}

/* Tags Input */
.tags-input-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 8px;
    min-height: 44px;
}

.selected-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: 12px;
    color: white;
    font-size: 0.85rem;
}

.remove-tag {
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    opacity: 0.7;
}

.remove-tag:hover {
    opacity: 1;
}

#tag-input {
    flex: 1;
    min-width: 120px;
    border: none;
    outline: none;
    font-size: 0.9rem;
    padding: 4px;
}

.available-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.available-tag-btn {
    padding: 4px 12px;
    border: 2px solid;
    background: transparent;
    border-radius: 12px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
}

.available-tag-btn:hover {
    opacity: 0.8;
}

/* Template Tags Container */
#template-tags-container {
    margin-bottom: 12px;
}

.template-tag-row {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 8px;
}

.template-tag-name {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.template-tag-color {
    width: 40px;
    height: 36px;
    padding: 2px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

/* Templates List */
.templates-list {
    margin-top: 16px;
}

.template-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
}

.template-title {
    font-weight: 500;
    margin-bottom: 4px;
}

.template-meta {
    display: flex;
    gap: 16px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 600px) {
    .app-header {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .header-actions {
        width: 100%;
        justify-content: center;
    }
    
    .stats-header {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
    
    .tasks-header {
        flex-direction: column;
        gap: 16px;
    }
    
    .date-navigation {
        width: 100%;
        justify-content: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .task-meta {
        flex-wrap: wrap;
    }
    
    .modal-footer {
        flex-wrap: wrap;
    }
    
    .modal-footer .btn {
        flex: 1;
    }
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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