/* 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-color: #f9fafb;
    color: #111827;
    line-height: 1.6;
}

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

/* Header */
.header {
    background: white;
    border-bottom: 1px solid #e5e7eb;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    font-size: 1.5rem;
    color: #8b5cf6;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #111827;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* Navigation */
.nav {
    background: white;
    border-bottom: 1px solid #e5e7eb;
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    gap: 2rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 0;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: #6b7280;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.nav-item:hover {
    color: #374151;
}

.nav-item.active {
    color: #8b5cf6;
    border-bottom-color: #8b5cf6;
}

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

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary {
    background: #8b5cf6;
    color: white;
}

.btn-primary:hover {
    background: #7c3aed;
}

.btn-secondary {
    background: #f3f4f6;
    color: #374151;
}

.btn-secondary:hover {
    background: #e5e7eb;
}

/* Tasks */
.tasks-container {
    background: white;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.tasks-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.task-filters {
    display: flex;
    gap: 1rem;
}

.filter-select {
    padding: 0.5rem;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    background: white;
    font-size: 0.875rem;
}

.tasks-list {
    padding: 1rem;
}

.task-item {
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 0.75rem;
    transition: all 0.2s;
}

.task-item:hover {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.task-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.task-title {
    font-weight: 600;
    color: #111827;
    margin-bottom: 0.25rem;
}

.task-priority {
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
}

.priority-urgent {
    background: #fef2f2;
    color: #dc2626;
}

.priority-high {
    background: #fef3c7;
    color: #d97706;
}

.priority-medium {
    background: #dbeafe;
    color: #2563eb;
}

.priority-low {
    background: #f0fdf4;
    color: #16a34a;
}

.task-description {
    color: #6b7280;
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
}

.task-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: #6b7280;
}

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

.task-actions button {
    padding: 0.25rem 0.5rem;
    border: none;
    background: none;
    color: #6b7280;
    cursor: pointer;
    border-radius: 0.25rem;
    transition: all 0.2s;
}

.task-actions button:hover {
    background: #f3f4f6;
    color: #374151;
}

/* Calendar */
.calendar-container {
    background: white;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.calendar-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background: #e5e7eb;
}

.calendar-day {
    background: white;
    padding: 0.75rem;
    min-height: 100px;
    border: none;
    cursor: pointer;
    transition: background 0.2s;
}

.calendar-day:hover {
    background: #f9fafb;
}

.calendar-day.other-month {
    color: #9ca3af;
    background: #f9fafb;
}

.calendar-day.today {
    background: #fef3c7;
}

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

.calendar-events {
    font-size: 0.75rem;
}

.calendar-event {
    background: #8b5cf6;
    color: white;
    padding: 0.125rem 0.25rem;
    border-radius: 0.25rem;
    margin-bottom: 0.125rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* AI Scheduler */
.ai-container {
    background: white;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.ai-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e5e7eb;
    text-align: center;
}

.ai-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.ai-header p {
    color: #6b7280;
}

.ai-content {
    padding: 1.5rem;
}

.ai-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.ai-results {
    background: #f9fafb;
    border-radius: 0.5rem;
    padding: 1rem;
    min-height: 200px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    border-radius: 0.75rem;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #6b7280;
}

.task-form {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #374151;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    font-size: 0.875rem;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #8b5cf6;
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 1.5rem;
}

/* Loading Overlay */
.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    text-align: center;
}

.loading-spinner i {
    font-size: 2rem;
    color: #8b5cf6;
    margin-bottom: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
        height: auto;
        padding: 1rem;
    }
    
    .header-actions {
        width: 100%;
        justify-content: center;
    }
    
    .nav-content {
        flex-direction: column;
        gap: 0;
    }
    
    .nav-item {
        justify-content: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .ai-actions {
        flex-direction: column;
    }
    
    .calendar-grid {
        font-size: 0.75rem;
    }
    
    .calendar-day {
        min-height: 80px;
        padding: 0.5rem;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

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

.mb-4 {
    margin-bottom: 1rem;
}

.mt-4 {
    margin-top: 1rem;
}

.p-4 {
    padding: 1rem;
}

.rounded {
    border-radius: 0.375rem;
}

.shadow {
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}