@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,600;0,9..144,700;1,9..144,400&family=DM+Sans:wght@400;500;700&display=swap');

:root {
    /* Color Palette - Warm Academic */
    --primary: #d97706;
    --primary-light: #fbbf24;
    --primary-dark: #b45309;
    --secondary: #0369a1;
    --success: #059669;
    --danger: #dc2626;
    --warning: #f59e0b;
    
    /* Neutrals */
    --bg-primary: #fefbf6;
    --bg-secondary: #fff7ed;
    --bg-tertiary: #ffffff;
    --text-primary: #1c1917;
    --text-secondary: #57534e;
    --text-muted: #78716c;
    --border: #e7e5e4;
    --shadow: rgba(28, 25, 23, 0.08);
    --shadow-lg: rgba(28, 25, 23, 0.15);
    
    /* Typography */
    --font-display: 'Fraunces', serif;
    --font-body: 'DM Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-primary: #1c1917;
    --bg-secondary: #292524;
    --bg-tertiary: #44403c;
    --text-primary: #fafaf9;
    --text-secondary: #d6d3d1;
    --text-muted: #a8a29e;
    --border: #44403c;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-lg: rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* App Layout */
.app-container {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    background: var(--bg-tertiary);
    border-right: 2px solid var(--border);
    padding: var(--spacing-xl);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.logo h1 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-2xl);
    font-style: italic;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
    width: 100%;
}

.nav-item .icon {
    font-size: 1.25rem;
}

.nav-item:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
    transform: translateX(4px);
}

.nav-item.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    box-shadow: 0 4px 12px var(--shadow);
}

/* Main Content */
.main-content {
    padding: var(--spacing-2xl);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.content-section {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

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

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

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--border);
}

.section-header h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.current-date {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-danger {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    box-shadow: 0 2px 8px var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px var(--shadow-lg);
}

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

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

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

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

.btn-danger:hover {
    background: #b91c1c;
}

/* Dashboard */
.dashboard-grid {
    display: grid;
    gap: var(--spacing-xl);
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
}

.stat-card {
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow-lg);
}

.stat-icon {
    font-size: 2.5rem;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
}

.stat-content h3 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.dashboard-card {
    background: var(--bg-tertiary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border);
}

.dashboard-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.schedule-list, .deadline-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    /* color: black; */
}

.schedule-item, .deadline-item {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--primary);
}

.schedule-item h4, .deadline-item h4 {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.schedule-item p, .deadline-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

/* Subjects Grid */
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.subject-card {
    background: var(--bg-tertiary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border);
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.subject-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: var(--subject-color, var(--primary));
}

.subject-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow-lg);
}

.subject-header {
    margin-bottom: var(--spacing-md);
}

.subject-name {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.subject-code {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.priority-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.priority-high {
    background: #fee2e2;
    color: #dc2626;
}

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

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

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

.subject-info span {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.subject-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-icon {
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.1rem;
}

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

/* Schedule */
.schedule-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.week-navigation {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.week-navigation button {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
}

.week-navigation button:hover {
    background: var(--primary-dark);
}

.week-navigation span {
    font-weight: 600;
    font-size: 1.1rem;
}

.day-group {
    margin-bottom: 20px;
}
.day-header {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 10px;
    border-bottom: 2px solid #eee;
    padding-bottom: 5px;
}
.schedule-card {
    /* display: flex; */
    /* justify-content: space-between;
    align-items: center; */
    /* padding: 12px; */
    /* margin-bottom: 8px; */
    /* border-radius: 8px; */
    /* background: #fff; */
    /* border-left: 5px solid #ccc; */
    /* box-shadow: 0 2px 4px rgba(0,0,0,0.05); */
    cursor: pointer;
    /* transition: transform 0.2s; */

    background: var(--bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border);
    border-left: 5px solid var(--subject-color, var(--primary));
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: var(--spacing-lg);
    align-items: start;
    transition: var(--transition);
    margin-bottom: 8px;
}
.schedule-card:hover {
    transform: translateY(-2px);
}

.time-slot, .day-header, .schedule-cell {
    background: var(--bg-tertiary);
    padding: var(--spacing-md);
    min-height: 60px;
}

.day-header {
    font-weight: 700;
    text-align: center;
    background: var(--bg-secondary);
    font-family: var(--font-display);
}

.time-slot {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.schedule-cell {
    position: relative;
    cursor: pointer;
    transition: var(--transition);
}

.schedule-cell:hover {
    background: var(--bg-secondary);
}

.session-block {
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    border-left: 3px solid;
    background: var(--bg-secondary);
    margin-bottom: var(--spacing-xs);
}

.session-block:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px var(--shadow);
}

.session-title {
    font-weight: 600;
    margin-bottom: 2px;
}

.session-time {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Tasks */
.task-filters {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary);
}

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

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

.task-card {
    background: var(--bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border);
    border-left: 5px solid var(--subject-color, var(--primary));
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: var(--spacing-lg);
    align-items: start;
    transition: var(--transition);
}

.task-card:hover {
    box-shadow: 0 4px 16px var(--shadow);
}

.task-checkbox {
    width: 24px;
    height: 24px;
    cursor: pointer;
    margin-top: 4px;
}

.task-content {
    flex: 1;
}

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

.task-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.task-meta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-sm);
}

.task-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

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

.task-deadline {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.task-deadline.urgent {
    color: var(--danger);
    font-weight: 600;
}

.task-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.task-card.completed {
    opacity: 0.6;
}

.task-card.completed .task-title {
    text-decoration: line-through;
}

/* Settings */
.settings-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.settings-group {
    background: var(--bg-tertiary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border);
}

.settings-group h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.setting-item {
    margin-bottom: var(--spacing-lg);
}

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

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

.setting-item input[type="checkbox"] {
    margin-right: var(--spacing-sm);
}

.setting-item select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
}

.help-text {
    margin-top: var(--spacing-xs);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.about-text {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
    animation: fadeIn 0.3s ease-out;
}

.modal-content {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px var(--shadow-lg);
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: var(--spacing-xl);
    border-bottom: 2px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
}

.close-modal {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition);
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-modal:hover {
    color: var(--danger);
    transform: rotate(90deg);
}

/* Forms */
form {
    padding: var(--spacing-xl);
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="color"],
.form-group input[type="time"],
.form-group input[type="datetime-local"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.1);
}

.form-group input[type="color"] {
    height: 50px;
    cursor: pointer;
}

.form-group input[type="checkbox"] {
    width: auto;
    margin-right: var(--spacing-sm);
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--border);
}

.warning-message {
    padding: var(--spacing-md);
    background: #fef3c7;
    border: 1px solid #fbbf24;
    border-radius: var(--radius-sm);
    color: #92400e;
    margin-top: var(--spacing-md);
}

/* Notifications styles removed (no notification container in index.html) */

/* Responsive Design */
@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: 220px 1fr;
    }
    
    .analytics-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .app-container {
        padding-top: 40px;
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        padding-top: 70px;
        position: fixed;
        left: -260px;
        z-index: 100;
        transition: var(--transition);
    }
    
    .sidebar.mobile-open {
        left: 0;
    }
    
    .main-content {
        padding: var(--spacing-lg);
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .stats-row {
        grid-template-columns: 1fr;
    }
    
    .subjects-grid {
        grid-template-columns: 1fr;
    }
    
    .schedule-list {
        grid-template-columns: 60px repeat(7, 1fr);
        font-size: 0.85rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* Mobile hamburger button */
.mobile-hamburger {
    display: none;
    position: fixed;
    left: 12px;
    top: 12px;
    z-index: 1100;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    padding: 8px 10px;
    border-radius: 10px;
    font-size: 20px;
    line-height: 1;
    cursor: pointer;
    box-shadow: 0 8px 20px var(--shadow);
}

@media (max-width: 768px) {
    .mobile-hamburger { display: block; }
}

/* Analytics styles */
.analytics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.chart-card, .insights-card {
    background: var(--bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border);
}

.progress {
    background: var(--bg-secondary);
    height: 16px;
    border-radius: 999px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--primary);
    transition: width 0.6s ease;
}

.bar-wrap {
    margin-bottom: var(--spacing-md);
}

.bar-label {
    font-size: 0.95rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
}

.bar {
    background: var(--bg-secondary);
    height: 12px;
    border-radius: 999px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.bar-fill {
    height: 100%;
    width: 0%;
    background: var(--primary);
    transition: width 0.6s ease;
}

.insights-card p {
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

@media (max-width: 1024px) {
    .analytics-grid {
        grid-template-columns: 1fr;
    }
}