:root {
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --error-color: #F44336;
    --accent-color: #9C27B0;
    --background-color: #f8f9fa;
    --surface-color: #ffffff;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 20px rgba(0,0,0,0.15);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--background-color) 0%, #e3f2fd 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding-bottom: 80px;
}

/* Header Styles */
.app-header {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    padding: 20px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-actions {
    display: flex;
    gap: 10px;
}

.sync-btn {
    background: rgba(255,255,255,0.2);
    border: none;
    color: white;
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sync-btn:hover {
    background: rgba(255,255,255,0.3);
    transform: rotate(180deg);
}

/* Main Content */
.main-content {
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

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

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Cards and Containers */
.welcome-card, .skill-input-card, .job-search-card, .profile-card {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.welcome-card:hover, .skill-input-card:hover, .job-search-card:hover, .profile-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.welcome-card h2 {
    color: var(--primary-color);
    margin-bottom: 12px;
    font-size: 1.4rem;
}

.welcome-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* Quick Stats */
.quick-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin: 20px 0;
}

.stat-item {
    text-align: center;
    padding: 16px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Buttons */
.primary-btn, .submit-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    text-decoration: none;
    justify-content: center;
    min-width: 120px;
}

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

.primary-btn:active, .submit-btn:active {
    transform: translateY(0);
}

/* Section Headers */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.section-header h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--surface-color);
}

.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-group textarea {
    resize: vertical;
    min-height: 80px;
}

/* Skills List */
.skills-list {
    display: grid;
    gap: 16px;
}

.skill-item {
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.skill-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.skill-info h4 {
    color: var(--text-primary);
    margin-bottom: 4px;
    font-size: 1.1rem;
}

.skill-meta {
    display: flex;
    gap: 12px;
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.skill-level {
    display: flex;
    gap: 2px;
}

.skill-level-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border-color);
}

.skill-level-dot.filled {
    background: var(--success-color);
}

.skill-category {
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.skill-category.technical {
    background: rgba(33, 150, 243, 0.1);
    color: var(--primary-color);
}

.skill-category.soft {
    background: rgba(76, 175, 80, 0.1);
    color: var(--success-color);
}

.skill-category.language {
    background: rgba(255, 193, 7, 0.1);
    color: var(--warning-color);
}

.skill-category.certification {
    background: rgba(156, 39, 176, 0.1);
    color: var(--accent-color);
}

.skill-actions {
    display: flex;
    gap: 8px;
}

.skill-actions button {
    background: none;
    border: none;
    padding: 8px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
}

.skill-actions button:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.skill-actions .delete-btn:hover {
    background: rgba(244, 67, 54, 0.1);
    color: var(--error-color);
}

/* Analysis Results */
.analysis-results {
    margin: 20px 0;
}

.job-match {
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 16px;
    transition: var(--transition);
}

.job-match:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.job-match h4 {
    color: var(--primary-color);
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.job-match-score {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 12px;
}

.job-match-score.high {
    background: rgba(76, 175, 80, 0.1);
    color: var(--success-color);
}

.job-match-score.medium {
    background: rgba(255, 193, 7, 0.1);
    color: var(--warning-color);
}

.job-match-score.low {
    background: rgba(244, 67, 54, 0.1);
    color: var(--error-color);
}

.job-requirements {
    margin-top: 12px;
}

.job-requirements h5 {
    margin-bottom: 8px;
    color: var(--text-primary);
}

.requirements-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.requirement-tag {
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.requirement-tag.matched {
    background: rgba(76, 175, 80, 0.1);
    color: var(--success-color);
}

.requirement-tag.missing {
    background: rgba(244, 67, 54, 0.1);
    color: var(--error-color);
}

/* Skill Gaps */
.skill-gaps h3 {
    color: var(--primary-color);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.gap-item {
    background: var(--surface-color);
    border: 2px solid var(--warning-color);
    border-radius: var(--border-radius);
    padding: 16px;
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.gap-info h4 {
    color: var(--warning-color);
    margin-bottom: 4px;
}

.gap-priority {
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
    color: white;
}

.gap-priority.high {
    background: var(--error-color);
}

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

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

/* Learning Paths */
.learning-path {
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 20px;
    transition: var(--transition);
}

.learning-path:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.learning-path h4 {
    color: var(--primary-color);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.path-resources {
    margin-top: 16px;
}

.resource-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 8px;
    transition: var(--transition);
}

.resource-item:hover {
    background: var(--background-color);
}

.resource-info h5 {
    margin-bottom: 4px;
    color: var(--text-primary);
}

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

.resource-link {
    background: var(--primary-color);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.resource-link:hover {
    background: var(--accent-color);
    transform: translateY(-1px);
}

/* Profile */
.profile-container {
    display: grid;
    gap: 20px;
}

.profile-avatar {
    text-align: center;
    margin-bottom: 20px;
}

.profile-avatar i {
    font-size: 4rem;
    color: var(--primary-color);
}

.profile-stats h3 {
    color: var(--primary-color);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.stat-card {
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

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

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

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

/* FAQ Section */
.faq-section {
    margin: 40px 0;
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.faq-section h2 {
    color: var(--primary-color);
    margin-bottom: 24px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 12px;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--primary-color);
}

.faq-question {
    width: 100%;
    background: var(--background-color);
    border: none;
    padding: 20px;
    text-align: left;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--primary-color);
    color: white;
}

.faq-question[aria-expanded="true"] {
    background: var(--primary-color);
    color: white;
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-icon {
    font-size: 1.2rem;
    transition: var(--transition);
}

.faq-answer {
    padding: 0 20px;
    background: var(--surface-color);
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease-in-out;
}

.faq-answer:not([hidden]) {
    padding: 20px;
    max-height: 200px;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Recent Activity */
.recent-activity h3 {
    color: var(--primary-color);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.activity-list {
    display: grid;
    gap: 12px;
}

.activity-item {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: var(--transition);
}

.activity-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.activity-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: white;
}

.activity-icon.skill {
    background: var(--success-color);
}

.activity-icon.analysis {
    background: var(--primary-color);
}

.activity-icon.learning {
    background: var(--accent-color);
}

.activity-content {
    flex: 1;
}

.activity-content h5 {
    margin-bottom: 4px;
    color: var(--text-primary);
}

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

/* Empty States */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 1.1rem;
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface-color);
    border-top: 2px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    padding: 12px 0 8px;
    z-index: 100;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    text-decoration: none;
    color: var(--text-secondary);
    transition: var(--transition);
    padding: 8px 12px;
    border-radius: 8px;
    min-width: 60px;
}

.nav-item:hover, .nav-item.active {
    color: var(--primary-color);
    background: rgba(33, 150, 243, 0.1);
}

.nav-item i {
    font-size: 1.2rem;
}

.nav-item span {
    font-size: 0.8rem;
    font-weight: 500;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 40px;
}

/* Loading States */
.loading {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.loading::after {
    content: '';
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive Design */
@media (min-width: 768px) {
    .main-content {
        padding: 40px;
    }
    
    .quick-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .profile-container {
        grid-template-columns: 2fr 1fr;
        gap: 40px;
    }
    
    .skills-container {
        display: grid;
        grid-template-columns: 1fr 2fr;
        gap: 40px;
        align-items: start;
    }
    
    .analysis-container {
        display: grid;
        grid-template-columns: 1fr 2fr;
        gap: 40px;
        align-items: start;
    }
    
    .bottom-nav {
        position: relative;
        background: var(--surface-color);
        border: 2px solid var(--border-color);
        border-radius: var(--border-radius);
        margin: 20px auto;
        max-width: 600px;
        box-shadow: var(--shadow);
    }
    
    body {
        padding-bottom: 0;
    }
}

@media (min-width: 1024px) {
    .app-header h1 {
        font-size: 2rem;
    }
    
    .section-header h2 {
        font-size: 1.8rem;
    }
    
    .welcome-card h2 {
        font-size: 1.6rem;
    }
}

/* Print Styles */
@media print {
    .bottom-nav, .header-actions, .primary-btn, .submit-btn {
        display: none !important;
    }
    
    .main-content {
        padding: 0;
    }
    
    .content-section {
        display: block !important;
        page-break-after: always;
    }
    
    .content-section:last-child {
        page-break-after: auto;
    }
}

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

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
        --shadow: 0 2px 10px rgba(0,0,0,0.3);
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #1a1a1a;
        --surface-color: #2d2d2d;
        --text-primary: #ffffff;
        --text-secondary: #b0b0b0;
        --border-color: #404040;
    }
    
    body {
        background: linear-gradient(135deg, var(--background-color) 0%, #0d47a1 100%);
    }
}