/* CSS Variables for theming */
:root {
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --danger-color: #F44336;
    --purple-color: #9C27B0;
    
    --bg-color: #ffffff;
    --surface-color: #f8f9fa;
    --text-color: #212529;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    
    --header-height: 70px;
    --nav-height: 60px;
    --footer-height: 50px;
    
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

/* Dark theme variables */
[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --surface-color: #2d2d2d;
    --text-color: #ffffff;
    --text-muted: #adb5bd;
    --border-color: #495057;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

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

/* Header */
.header {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    height: var(--header-height);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    padding: 0 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.app-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

/* Navigation */
.nav-tabs {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    height: var(--nav-height);
    display: flex;
    padding: 0 1rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.nav-tab {
    background: none;
    border: none;
    padding: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 500;
    border-bottom: 3px solid transparent;
    transition: var(--transition);
    min-width: 120px;
    justify-content: center;
}

.nav-tab:hover {
    color: var(--text-color);
    background-color: var(--bg-color);
}

.nav-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

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

/* Views */
.view {
    display: none;
}

.view.active {
    display: block;
}

.view-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.view-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
}

.view-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

/* Calendar */
.calendar-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.month-title {
    font-size: 1.5rem;
    font-weight: 600;
    min-width: 200px;
    text-align: center;
}

.calendar-container {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background-color: var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.calendar-day {
    background-color: var(--bg-color);
    padding: 0.75rem;
    min-height: 120px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.calendar-day:hover {
    background-color: var(--surface-color);
}

.calendar-day.other-month {
    color: var(--text-muted);
    background-color: var(--surface-color);
}

.calendar-day.today {
    background-color: var(--primary-color);
    color: white;
}

.calendar-day.selected {
    background-color: var(--warning-color);
    color: white;
}

.day-number {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.day-events {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.event-item {
    background-color: var(--primary-color);
    color: white;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.75rem;
    cursor: pointer;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Daily summary */
.daily-summary {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.daily-summary h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.summary-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.summary-item {
    padding: 1rem;
    background-color: var(--bg-color);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

/* Tasks */
.tasks-container {
    display: grid;
    gap: 1rem;
}

.task-item {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

.task-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.task-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.task-content {
    flex: 1;
}

.task-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.task-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    flex-wrap: wrap;
}

.task-priority {
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
}

.task-priority.high {
    background-color: var(--danger-color);
    color: white;
}

.task-priority.medium {
    background-color: var(--warning-color);
    color: white;
}

.task-priority.low {
    background-color: var(--success-color);
    color: white;
}

.task-status {
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
}

.task-status.pending {
    background-color: var(--text-muted);
    color: white;
}

.task-status.in-progress {
    background-color: var(--warning-color);
    color: white;
}

.task-status.completed {
    background-color: var(--success-color);
    color: white;
}

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

/* Members */
.members-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.member-card {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.member-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.member-avatar {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.member-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.member-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
}

.stat-item {
    text-align: center;
}

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

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.member-actions {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.btn-primary:hover {
    background-color: #1976D2;
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--text-muted);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
}

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-icon {
    background: none;
    border: none;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    color: var(--text-color);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.btn-small {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
}

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

.btn-danger:hover {
    background-color: #d32f2f;
}

/* Form elements */
.select-input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
}

/* Icons */
.icon {
    font-size: 1.2em;
    display: inline-block;
}

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

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--bg-color);
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

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

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

.modal-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    color: var(--text-muted);
}

.modal-form {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-color);
    color: var(--text-color);
    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(33, 150, 243, 0.1);
}

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

.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.5rem;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.checkbox-group label:hover {
    background-color: var(--surface-color);
}

.color-picker {
    display: flex;
    gap: 0.5rem;
}

.color-option {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid transparent;
    transition: var(--transition);
}

.color-option.active {
    border-color: var(--text-color);
    transform: scale(1.1);
}

.avatar-picker {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.avatar-option {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    cursor: pointer;
    border: 3px solid transparent;
    transition: var(--transition);
    background-color: var(--surface-color);
}

.avatar-option.active {
    border-color: var(--primary-color);
    transform: scale(1.1);
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

/* Footer */
.footer {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    height: var(--footer-height);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Responsive design */
@media (max-width: 768px) {
    .header-content {
        padding: 0 0.5rem;
    }
    
    .app-title {
        font-size: 1.25rem;
    }
    
    .nav-tabs {
        padding: 0 0.5rem;
    }
    
    .nav-tab {
        padding: 0.75rem 0.5rem;
        min-width: auto;
        flex: 1;
    }
    
    .main-content {
        padding: 0.5rem;
    }
    
    .view-header {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }
    
    .calendar-controls {
        justify-content: center;
    }
    
    .calendar-day {
        min-height: 80px;
        padding: 0.5rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
    
    .members-container {
        grid-template-columns: 1fr;
    }
    
    .summary-content {
        grid-template-columns: 1fr;
    }
    
    .modal-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .calendar-grid {
        font-size: 0.875rem;
    }
    
    .calendar-day {
        min-height: 60px;
        padding: 0.25rem;
    }
    
    .event-item {
        font-size: 0.625rem;
        padding: 1px 4px;
    }
    
    .task-item {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }
    
    .task-meta {
        justify-content: center;
    }
    
    .header-controls {
        gap: 0.25rem;
    }
    
    .btn-icon {
        padding: 0.25rem;
    }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    }
    
    [data-theme="dark"] {
        --border-color: #ffffff;
    }
}

/* Print styles */
@media print {
    .header,
    .nav-tabs,
    .footer,
    .modal,
    .btn-primary,
    .btn-secondary,
    .btn-icon {
        display: none !important;
    }
    
    .main-content {
        padding: 0;
        max-width: none;
    }
    
    .calendar-day {
        border: 1px solid #000;
    }
}