/* Dashboard CSS - Neue Version */
:root {
    /* Main Colors */
    --primary-color: #ff6b35;
    --primary-hover: #ff5722;
    --secondary-color: #f7931e;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --error-color: #e74c3c;
    --info-color: #3498db;
    
    /* Background Colors */
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-dark: #1a1a1a;
    
    /* Text Colors */
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-light: #95a5a6;
    --text-white: #ffffff;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
    --gradient-dark: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
    --gradient-header: linear-gradient(135deg, #1a1a1a 0%, #2c3e50 100%);
    
    /* Shadows */
    --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);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.2);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Header */
.main-header {
    background: var(--gradient-header);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 3rem;
}

/* Logo Section */
.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

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

.logo-icon {
    font-size: 2.5rem;
    animation: float 3s ease-in-out infinite;
}

.logo-text {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-white);
    letter-spacing: -1px;
}

.tagline {
    color: var(--text-white);
    opacity: 0.8;
    font-size: 0.9rem;
    border-left: 2px solid rgba(255,255,255,0.3);
    padding-left: 1rem;
}

/* Navigation */
.main-nav {
    display: flex;
    gap: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    color: var(--text-white);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    font-weight: 500;
    position: relative;
}

.nav-item:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-1px);
}

.nav-item.active {
    background: rgba(255,255,255,0.15);
}

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 40%;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
}

.nav-icon {
    font-size: 1.2rem;
}

/* User Menu */
.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.5rem 1rem;
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
}

.user-avatar {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: white;
    font-size: 1rem;
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-name {
    color: var(--text-white);
    font-weight: 600;
    font-size: 0.9rem;
}

.user-role {
    color: var(--text-white);
    opacity: 0.7;
    font-size: 0.8rem;
}

.btn-logout {
    background: rgba(231, 76, 60, 0.9);
    color: white;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

/* Demo Banner */
.demo-banner {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--gradient-primary);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-xl);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    animation: bounce 2s ease-in-out infinite;
}

.demo-icon {
    font-size: 1.2rem;
}

/* Main Container */
.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Content Sections */
.content-section {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

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

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

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.section-subtitle {
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.8;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-trend {
    color: var(--success-color);
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

/* Quick Actions */
.quick-actions-container {
    margin-bottom: 3rem;
}

.subsection-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.quick-actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.quick-action-card {
    background: var(--bg-secondary);
    border: 2px solid transparent;
    padding: 2rem 1.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.quick-action-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.action-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.action-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.action-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Recent Activities */
.recent-activities {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.activity-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.activity-item:hover {
    background: #f0f0f0;
}

.activity-icon {
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 107, 53, 0.1);
    border-radius: var(--radius-sm);
}

.activity-content {
    flex: 1;
}

.activity-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.activity-details {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.activity-time {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* Buttons */
.btn-primary {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 0.8rem 1.8rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-sm);
}

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

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 2px solid #e0e0e0;
    padding: 0.8rem 1.8rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-success {
    background: var(--success-color);
    color: white;
    border: none;
    padding: 0.8rem 1.8rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    width: 100%;
    margin-top: 2rem;
}

/* Topics Grid */
.topics-grid {
    display: grid;
    gap: 1.5rem;
}

.topic-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

.topic-header {
    margin-bottom: 1rem;
}

.topic-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.8rem;
}

.topic-subjects {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.subject-tag {
    background: #fff3cd;
    color: #856404;
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
}

.topic-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.topic-footer {
    padding-top: 1rem;
    border-top: 1px solid #e0e0e0;
}

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

/* Groups */
.groups-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.group-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.group-card:hover {
    box-shadow: var(--shadow-md);
}

.group-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1.5rem;
}

.group-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

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

.group-status {
    padding: 0.4rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
}

.group-status.active {
    background: var(--success-color);
    color: white;
}

.group-students {
    display: grid;
    gap: 0.8rem;
}

.student-tag {
    background: var(--bg-primary);
    padding: 0.8rem 1rem;
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.student-info {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Ratings */
.filter-bar {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-select {
    padding: 0.6rem 1.2rem;
    border: 2px solid #e0e0e0;
    border-radius: var(--radius-sm);
    background: white;
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-select:hover,
.filter-select:focus {
    border-color: var(--primary-color);
    outline: none;
}

.ratings-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.rating-card {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.rating-card:hover {
    box-shadow: var(--shadow-md);
}

.rating-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.rating-student-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

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

.rating-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.grade-badge {
    background: var(--success-color);
    color: white;
    padding: 0.4rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
}

.status-badge {
    padding: 0.4rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.85rem;
}

.status-badge.pending {
    background: #fff3cd;
    color: #856404;
}

.btn-rate {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

.template-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

.template-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.template-categories {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.category-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
}

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

.category-weight {
    background: var(--primary-color);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
}

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

.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: modalIn 0.3s ease-out;
}

.modal-wide {
    max-width: 900px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #e0e0e0;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

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

.modal-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #e0e0e0;
}

/* Form Elements */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-input,
.form-select,
.form-textarea {
    padding: 0.8rem 1rem;
    border: 2px solid #e0e0e0;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: white;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

.weight-input {
    margin-top: 0.5rem;
}

/* Checkbox Grid */
.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 0.8rem;
    max-height: 200px;
    overflow-y: auto;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
}

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

.checkbox-label:hover {
    background: #e0e0e0;
}

.checkbox-label input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* Student Selection */
.student-select-grid {
    display: grid;
    gap: 0.8rem;
    max-height: 300px;
    overflow-y: auto;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
}

.student-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem;
    background: white;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.student-checkbox:hover {
    background: #f8f8f8;
}

.student-checkbox.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.student-checkbox input {
    width: 18px;
    height: 18px;
}

.assigned-tag {
    margin-left: auto;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* Assignment Section */
.assignment-section {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin-top: 1rem;
}

.assignment-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.assignment-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.assignment-row {
    display: grid;
    grid-template-columns: 2fr 1.5fr 1.5fr;
    gap: 1rem;
    align-items: center;
    padding: 0.8rem;
    background: white;
    border-radius: var(--radius-sm);
}

.student-label {
    font-weight: 500;
    color: var(--text-primary);
}

/* Rating Modal */
.rating-container {
    display: flex;
    flex-direction: column;
}

.rating-header {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
}

.student-name {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.project-info {
    color: var(--text-secondary);
}

/* Rating Tabs */
.rating-tabs {
    display: flex;
    background: var(--bg-primary);
    padding: 0.5rem;
    border-radius: var(--radius-md);
    margin-bottom: 2rem;
    gap: 0.5rem;
}

.tab-button {
    flex: 1;
    padding: 0.8rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.tab-button:hover {
    background: white;
}

.tab-button.active {
    background: white;
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.tab-icon {
    font-size: 1.2rem;
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

/* Final Grade Display */
.final-grade-card {
    background: var(--gradient-primary);
    color: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    margin-bottom: 2rem;
}

.final-grade-card h4 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    opacity: 0.9;
    margin-bottom: 1rem;
}

.final-grade-display {
    font-size: 3rem;
    font-weight: 700;
}

/* Grade Input Section */
.grade-input-section {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
}

.grade-input {
    width: 100px;
    padding: 0.5rem;
    text-align: center;
    font-weight: 600;
    border: 2px solid #e0e0e0;
    border-radius: var(--radius-sm);
}

.arrow {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

/* Template Selector */
.template-selector {
    margin-bottom: 2rem;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
}

/* Rating Categories */
.category-ratings {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.rating-category {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
}

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

.category-header h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Grade Buttons */
.grade-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.grade-btn {
    min-width: 60px;
    padding: 0.8rem 1rem;
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.grade-btn:hover {
    border-color: var(--primary-color);
    background: #fff5f0;
}

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

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

/* Strengths Grid */
.strengths-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.strength-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.strength-item:hover {
    background: #e0e0e0;
}

.strength-item input {
    width: 18px;
    height: 18px;
}

/* Note Textarea */
.note-textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: var(--radius-md);
    font-size: 1rem;
    resize: vertical;
}

.char-count {
    text-align: right;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* Info Box */
.info-box {
    background: #e3f2fd;
    border: 1px solid #2196f3;
    padding: 1rem;
    border-radius: var(--radius-md);
    color: #1565c0;
}

.weight-display {
    margin-top: 0.5rem;
    font-size: 1.1rem;
}

/* Toast Notification */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    background: var(--success-color);
    color: white;
    padding: 1rem 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 0.8rem;
    z-index: 3000;
    transition: transform 0.3s ease-out;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast-icon {
    font-size: 1.5rem;
}

.toast-message {
    font-weight: 500;
}

/* Welcome Overlay */
.welcome-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 5000;
}

.welcome-modal {
    background: white;
    border-radius: var(--radius-xl);
    padding: 3rem;
    max-width: 700px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: modalIn 0.5s ease-out;
}

.welcome-header {
    text-align: center;
    margin-bottom: 2rem;
}

.welcome-logo {
    font-size: 5rem;
    margin-bottom: 1rem;
    animation: float 3s ease-in-out infinite;
}

.welcome-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.welcome-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.welcome-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.feature-item {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-item h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

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

.demo-info {
    background: #fff3cd;
    border: 1px solid #ffc107;
    padding: 1.5rem;
    border-radius: var(--radius-md);
    color: #856404;
}

.btn-start {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 1rem 3rem;
    border-radius: var(--radius-lg);
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    margin: 0 auto;
    display: block;
    transition: all var(--transition-normal);
}

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

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

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-5px);
    }
}

/* Responsive Design */
@media (max-width: 1200px) {
    .header-container {
        gap: 2rem;
    }
    
    .tagline {
        display: none;
    }
}

@media (max-width: 768px) {
    .header-container {
        flex-wrap: wrap;
        padding: 1rem;
        gap: 1rem;
    }
    
    .logo-section {
        width: 100%;
        justify-content: center;
    }
    
    .main-nav {
        width: 100%;
        order: 3;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .nav-item {
        font-size: 0.9rem;
        padding: 0.5rem 0.8rem;
    }
    
    .nav-item span:not(.nav-icon) {
        display: none;
    }
    
    .header-actions {
        margin-left: auto;
    }
    
    .user-info {
        display: none;
    }
    
    .main-container {
        padding: 1rem;
    }
    
    .section-header {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .quick-actions-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        padding: 1.5rem;
        margin: 1rem;
    }
    
    .assignment-row {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    
    .rating-tabs {
        flex-wrap: wrap;
    }
    
    .tab-button span:not(.tab-icon) {
        display: none;
    }
    
    .demo-banner {
        bottom: 10px;
        right: 10px;
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }
    
    .welcome-modal {
        padding: 2rem;
    }
    
    .welcome-title {
        font-size: 2rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .filter-bar {
        flex-direction: column;
    }
    
    .filter-select {
        width: 100%;
    }
    
    .modal-actions {
        flex-direction: column;
    }
    
    .modal-actions button {
        width: 100%;
    }
}

/* Print Styles */
@media print {
    .main-header,
    .demo-banner,
    .btn-primary,
    .btn-secondary,
    .btn-logout,
    .modal {
        display: none !important;
    }
    
    .main-container {
        max-width: 100%;
    }
    
    .content-section {
        page-break-inside: avoid;
    }
}