/* Planaxa - Modern CSS */
:root {
    /* Colors */
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --primary-light: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* Dark Theme Backgrounds */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    
    /* Dark Theme Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    /* Dark Theme Borders */
    --border-color: #334155;
    --border-hover: #475569;
    
    /* Dark Theme Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    
    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: var(--font-size-base);
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: var(--font-size-2xl);
}

.logo-tagline {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 400;
    font-style: italic;
    padding-left: calc(var(--font-size-2xl) + var(--spacing-md));
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--border-hover);
}

.nav-menu {
    list-style: none;
    padding: var(--spacing-lg);
}

.nav-item {
    margin-bottom: var(--spacing-xs);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    text-decoration: none;
    color: var(--text-secondary);
    border-radius: var(--radius-lg);
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-link:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.nav-link.active {
    background-color: var(--primary-light);
    color: var(--primary-color);
}

.nav-link i {
    width: 20px;
    text-align: center;
}

/* Sidebar Footer */
.sidebar-footer {
    margin-top: auto;
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.privacy-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.privacy-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    color: var(--primary-color);
    font-weight: 500;
}

.privacy-badge i {
    font-size: var(--font-size-sm);
}

.sidebar-footer .footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.sidebar-footer .footer-links a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-xs);
    border-radius: var(--radius-md);
    transition: all 0.2s;
}

.sidebar-footer .footer-links a:hover {
    background: var(--bg-tertiary);
    color: var(--primary-color);
}

.sidebar-footer .footer-links a i {
    width: 16px;
    text-align: center;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 280px;
    min-height: 100vh;
}

.main-header {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl) var(--spacing-2xl);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
}

.main-header h1 {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    color: var(--text-primary);
}

.header-actions {
    display: flex;
    gap: var(--spacing-md);
}

.content-area {
    padding: var(--spacing-2xl);
}

/* Pages */
.page {
    display: none;
}

.page.active {
    display: block;
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.dashboard-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.dashboard-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.card-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.view-all {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: color 0.3s ease;
}

.view-all:hover {
    color: var(--primary-hover);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

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

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

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

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

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

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

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

/* Lists */
.homework-list, .exams-list, .grades-list, .events-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.item-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.item-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.item-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.item-subject {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: white;
}

.item-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.item-description {
    color: var(--text-secondary);
    line-height: 1.5;
}

.item-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

/* Subject Grid */
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.subject-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    cursor: pointer;
}

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

.subject-color {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    color: white;
}

.subject-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

/* Grades Overview */
.grades-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.grade-summary-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.grade-value {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.grade-label {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

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

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

.modal {
    background-color: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
}

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

.modal-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-lg);
    cursor: pointer;
    color: var(--text-secondary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.modal-close:hover {
    background-color: var(--bg-tertiary);
}

.modal-content {
    padding: var(--spacing-xl);
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.form-input, .form-textarea, .form-select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: inherit;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

/* Priority Indicators */
.priority-high {
    background-color: var(--danger-color);
}

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

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

/* Status Indicators */
.status-pending {
    background-color: var(--warning-color);
}

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

.status-overdue {
    background-color: var(--danger-color);
}

/* Grade Display */
.grade-display {
    background-color: var(--primary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.grade-excellent {
    background-color: var(--success-color);
}

.grade-good {
    background-color: #22c55e;
}

.grade-satisfactory {
    background-color: var(--warning-color);
}

.grade-poor {
    background-color: var(--danger-color);
}

/* Settings */
.settings-container {
    max-width: 600px;
}

.settings-section {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.settings-section h3 {
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--border-color);
}

.setting-item:last-child {
    border-bottom: none;
}

.settings-info {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--primary-color);
}

.settings-info p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.settings-info i {
    color: var(--primary-color);
}

.settings-section .btn {
    margin-right: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .main-header {
        padding: var(--spacing-lg);
    }
    
    .content-area {
        padding: var(--spacing-lg);
    }
}

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100px);
    }
}

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

/* Utilities */
.text-center {
    text-align: center;
}

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

.mb-0 {
    margin-bottom: 0;
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.hidden {
    display: none;
}

.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Dashboard Item Styles */
.dashboard-item {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-md);
    transition: all 0.3s ease;
}

.dashboard-item:hover {
    box-shadow: var(--shadow-sm);
    border-color: var(--border-hover);
}

.dashboard-item:last-child {
    margin-bottom: 0;
}

.dashboard-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.dashboard-item-title {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.dashboard-item-location {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.dashboard-item-location:before {
    content: "📍";
}

.item-date {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.item-time {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    background-color: var(--bg-tertiary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.dashboard-item-priority {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-left: auto;
}

.grade-summary-dashboard {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.grade-avg-overall {
    text-align: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    border-radius: var(--radius-lg);
    color: white;
}

.grade-avg-overall .grade-value {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.grade-avg-overall .grade-label {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.grade-subjects {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.grade-subject-item {
    display: flex;
    justify-content: between;
    align-items: center;
    padding: var(--spacing-sm);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.subject-name {
    font-weight: 500;
    color: var(--text-primary);
}

.subject-avg {
    font-weight: 600;
    color: var(--primary-color);
    margin-left: auto;
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
}

.priority-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

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

.completed {
    opacity: 0.7;
}

.completed .dashboard-item-title {
    text-decoration: line-through;
}

/* Special Dashboard States */
.exam-today {
    border-left: 4px solid var(--danger-color);
    background: rgba(239, 68, 68, 0.05);
}

.event-today {
    border-left: 4px solid var(--primary-color);
    background: rgba(59, 130, 246, 0.05);
}

.exam-past {
    opacity: 0.6;
    border-left: 4px solid var(--text-muted);
}

.exam-past .item-title {
    color: var(--text-muted);
}

.homework-overdue {
    border-left: 4px solid var(--danger-color);
    background: rgba(239, 68, 68, 0.08);
}

.homework-today {
    border-left: 4px solid var(--warning-color);
    background: rgba(245, 158, 11, 0.08);
}

.event-past {
    opacity: 0.6;
    border-left: 4px solid var(--text-muted);
}

.event-past .item-title {
    color: var(--text-muted);
}

/* Archive System */
.archive-section {
    margin-top: var(--spacing-2xl);
    border-top: 1px solid var(--border-color);
    padding-top: var(--spacing-xl);
}

.archive-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: var(--spacing-lg);
    user-select: none;
}

.archive-toggle:hover {
    background-color: var(--border-color);
}

.archive-toggle.active {
    background-color: var(--primary-color);
    color: white;
}

.archive-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.archive-count {
    background-color: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.archive-icon {
    font-size: var(--font-size-lg);
    transition: transform 0.3s ease;
}

.archive-toggle.active .archive-icon {
    transform: rotate(180deg);
}

.archive-content {
    display: none;
    animation: slideDown 0.3s ease;
}

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

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.archive-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.dashboard-item-description {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
    line-height: 1.4;
}

/* Button Sizes */
.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
}

.subject-actions {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
    justify-content: center;
}

.subject-actions .btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
}