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

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.3s ease;
    overflow-x: hidden;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    background: var(--bg-secondary);
    border-bottom: var(--border-primary);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--accent-primary);
    text-shadow: var(--text-glow);
}

.nav {
    display: flex;
    gap: 1rem;
}

.nav-btn {
    background: var(--btn-secondary);
    color: var(--text-secondary);
    border: var(--border-secondary);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-btn:hover {
    background: var(--btn-hover);
    color: var(--text-primary);
    transform: var(--hover-transform);
}

.nav-btn.active {
    background: var(--accent-primary);
    color: var(--text-inverse);
    box-shadow: var(--glow-effect);
}

.theme-selector {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: var(--border-primary);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
}

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

.page {
    display: none;
    animation: fadeIn 0.5s ease-in;
}

.page.active {
    display: block;
}

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

.hero {
    text-align: center;
    padding: 3rem 0;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-large);
    margin-bottom: 2rem;
    border: var(--border-primary);
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--accent-primary);
    text-shadow: var(--text-glow);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

.progress-overview {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.progress-card {
    background: var(--bg-tertiary);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: var(--border-secondary);
    min-width: 250px;
}

.progress-card h3 {
    margin-bottom: 1rem;
    color: var(--accent-secondary);
}

.progress-bar {
    background: var(--bg-primary);
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    background: var(--progress-gradient);
    height: 100%;
    transition: width 0.5s ease;
    border-radius: 4px;
}

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

.stat-item {
    text-align: center;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    border: var(--border-secondary);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: var(--accent-primary);
    text-shadow: var(--text-glow);
}

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

.cta-button {
    background: var(--btn-primary);
    color: var(--text-inverse);
    border: none;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: bold;
    box-shadow: var(--glow-effect);
}

.cta-button:hover {
    transform: var(--hover-transform);
    box-shadow: var(--glow-effect-hover);
}

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

.lessons-header h2 {
    color: var(--accent-primary);
    font-size: 2rem;
}

.lesson-tabs, .tab-buttons {
    display: flex;
    gap: 0.5rem;
    background: var(--bg-secondary);
    padding: 0.25rem;
    border-radius: var(--border-radius);
    border: var(--border-primary);
}

.tab-btn {
    background: transparent;
    color: var(--text-secondary);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.tab-btn:hover {
    background: var(--btn-hover);
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--accent-primary);
    color: var(--text-inverse);
    box-shadow: var(--glow-effect);
}

.lesson-content {
    margin-top: 2rem;
}

.tab-content {
    display: none;
}

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

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

.lesson-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
}

.lesson-card:hover {
    transform: var(--hover-transform);
    border-color: var(--accent-primary);
    box-shadow: var(--glow-effect);
}

.lesson-card.completed {
    border-color: var(--success-color);
}

.lesson-card.current {
    border-color: var(--accent-primary);
    box-shadow: var(--glow-effect);
}

.lesson-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    font-size: 1.2rem;
}

.lesson-card.completed .lesson-icon {
    background: var(--success-color);
    color: white;
}

.lesson-card.current .lesson-icon {
    background: var(--accent-primary);
    color: var(--text-inverse);
}

.lesson-info {
    flex: 1;
}

.lesson-info h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.lesson-progress {
    margin-top: 0.75rem;
}

.lesson-progress-bar {
    background: var(--bg-primary);
    height: 6px;
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 0.25rem;
}

.lesson-progress-fill {
    background: var(--progress-gradient);
    height: 100%;
    transition: width 0.5s ease;
    border-radius: 3px;
}

.lesson-progress-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.lesson-card.locked {
    opacity: 0.6;
    cursor: not-allowed;
}

.lesson-card.locked:hover {
    transform: none;
    border-color: var(--border-secondary);
    box-shadow: none;
}

.lesson-status {
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-size: 0.8rem;
    font-weight: bold;
}

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

.lesson-card.current .lesson-status {
    background: var(--accent-primary);
    color: var(--text-inverse);
}

.lesson-card:not(.completed):not(.current) .lesson-status {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.lesson-detail {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-large);
    padding: 2rem;
    border: var(--border-primary);
}

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

.lesson-header .refresh-btn {
    background: var(--accent-secondary);
    color: var(--text-inverse);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.lesson-header .refresh-btn:hover {
    background: var(--accent-primary);
    transform: var(--hover-transform);
}

.back-btn {
    background: var(--btn-secondary);
    color: var(--text-primary);
    border: var(--border-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: var(--btn-hover);
    transform: var(--hover-transform);
}

.lesson-main {
    margin-top: 2rem;
}

.explanation h3, .exercise h3 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.code-example {
    background: var(--bg-tertiary);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.code-example h4 {
    margin-bottom: 1rem;
    color: var(--accent-secondary);
}

.code-example pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 1rem;
    border-radius: var(--border-radius);
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    border: var(--border-primary);
}

.interactive-demo, .exercise-problem {
    background: var(--bg-tertiary);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 1.5rem 0;
}

/* Enhanced Code Editor with proper layering */
.code-editor-wrapper {
    position: relative;
    display: flex;
    border: var(--border-primary);
    border-radius: var(--border-radius);
    background: var(--code-bg);
    overflow: hidden;
    margin-bottom: 1rem;
    min-height: 120px;
}

.line-numbers {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 1rem 0.75rem;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.4;
    min-width: 50px;
    width: 50px;
    text-align: right;
    border-right: 1px solid var(--border-secondary);
    user-select: none;
    flex-shrink: 0;
    white-space: pre-line;
    overflow: hidden;
}

.code-editor {
    width: 100%;
    min-height: 120px;
    background: transparent;
    color: var(--code-text);
    border: none;
    border-radius: 0;
    padding: 1rem;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    resize: none;
    outline: none;
    line-height: 1.5;
    position: relative;
    z-index: 3;
    margin: 0;
    flex: 1;
}

.code-editor:focus {
    outline: none;
    background: transparent;
}

.code-editor-wrapper:focus-within {
    border-color: var(--accent-primary);
    box-shadow: var(--glow-effect);
}

/* Syntax highlighting overlay */
.syntax-overlay {
    position: absolute;
    top: 1rem;
    left: 51px;
    right: 1rem;
    bottom: 1rem;
    padding: 0;
    margin: 0;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.4;
    pointer-events: none;
    white-space: pre-wrap;
    overflow: hidden;
    color: transparent;
    z-index: 0;
    word-wrap: break-word;
    overflow-wrap: break-word;
    display: none;
}

/* Text layer for visible text when using syntax highlighting */
.text-layer {
    display: none;
}

.run-btn, .hint-btn, .answer-btn, .project-btn {
    background: var(--btn-primary);
    color: var(--text-inverse);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: bold;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

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

.answer-btn {
    background: var(--btn-info);
}

.run-btn:hover, .hint-btn:hover, .answer-btn:hover, .project-btn:hover {
    transform: var(--hover-transform);
    box-shadow: var(--glow-effect);
}

.output-area, .feedback-area {
    background: var(--output-bg);
    border: var(--border-primary);
    border-radius: var(--border-radius);
    padding: 1rem;
    min-height: 80px;
    max-height: 200px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.4;
    margin-top: 1rem;
    white-space: pre-wrap;
    overflow-y: auto;
    position: relative;
    z-index: 1;
    color: var(--text-primary);
}

.feedback-area {
    background: var(--feedback-bg);
}

.feedback-area.success {
    background: var(--success-bg);
    color: var(--success-text);
    border-color: var(--success-color);
}

.feedback-area.error {
    background: var(--error-bg);
    color: var(--error-text);
    border-color: var(--error-color);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.project-card {
    background: var(--bg-secondary);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.project-card:hover:not(.locked) {
    transform: var(--hover-transform);
    border-color: var(--accent-primary);
    box-shadow: var(--glow-effect);
}

.project-card.locked {
    opacity: 0.6;
    cursor: not-allowed;
}

.project-card h3, .project-card h4 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.project-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.project-btn:disabled {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: not-allowed;
    transform: none;
}

.exercise-container {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: var(--border-primary);
}

.exercise-list .exercise-problem {
    background: var(--bg-tertiary);
    border: var(--border-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.exercise-list .exercise-problem h4 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.exercise-list .exercise-problem p {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.next-problem-btn {
    background: var(--accent-primary) !important;
    color: var(--text-inverse) !important;
    border: none !important;
    padding: 0.75rem 1.5rem !important;
    border-radius: var(--border-radius) !important;
    margin-top: 1rem !important;
    cursor: pointer !important;
    font-weight: bold !important;
    transition: all 0.3s ease !important;
    display: inline-block !important;
}

.next-problem-btn:hover {
    background: var(--accent-secondary) !important;
    transform: var(--hover-transform) !important;
    box-shadow: var(--glow-effect) !important;
}

.lesson-completion {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--success-bg);
    border: 2px solid var(--success-color);
    border-radius: var(--border-radius);
    text-align: center;
}

/* Points and penalty system styles */
.points-breakdown {
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-top: 1rem;
    border-left: 4px solid var(--success-color);
}

.points-breakdown p {
    margin: 0.5rem 0;
}

.penalties {
    color: var(--error-color);
    font-style: italic;
}

.final-points {
    color: var(--success-color);
    font-size: 1.1rem;
}

.penalty-notice {
    color: #ff9800;
    font-weight: bold;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.warning-notice {
    color: var(--error-color);
    font-weight: bold;
    font-size: 0.9rem;
    margin: 0.5rem 0;
}

.feedback-area.hint {
    border-left: 4px solid #ff9800;
    background: rgba(255, 152, 0, 0.1);
}

.feedback-area.answer-shown {
    border-left: 4px solid var(--error-color);
    background: rgba(239, 68, 68, 0.1);
}

.feedback-area.warning {
    border-left: 4px solid #ff9800;
    background: rgba(255, 152, 0, 0.1);
}

.retry-btn {
    background: var(--accent-primary);
    color: var(--text-inverse);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: bold;
    margin: 0.5rem 0;
    transition: all 0.3s ease;
}

.retry-btn:hover {
    background: var(--accent-secondary);
    transform: var(--hover-transform);
}

.retry-success {
    color: var(--success-color);
    font-weight: bold;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.exercise-list {
    margin-top: 1rem;
}

.exercise-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--bg-tertiary);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.exercise-item:hover {
    transform: var(--hover-transform);
    border-color: var(--accent-primary);
}

.exercise-status {
    font-weight: bold;
}

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

.exercise-status.current {
    color: var(--accent-primary);
}

.profile-content {
    display: grid;
    gap: 2rem;
}

.stats-section, .badges-section {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: var(--border-primary);
}

.stats-section h3, .badges-section h3 {
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.stat-card {
    background: var(--bg-tertiary);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: var(--hover-transform);
    border-color: var(--accent-primary);
}

.badges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
}

.badge-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;
    background: var(--bg-tertiary);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
    text-align: center;
    position: relative;
    cursor: pointer;
}

.badge-item.earned {
    border-color: var(--accent-primary);
    box-shadow: var(--glow-effect);
}

.badge-item:not(.earned) {
    opacity: 0.5;
    filter: grayscale(100%);
}

.badge-item:hover {
    transform: var(--hover-transform);
}

.badge-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    transition: transform 0.3s ease;
}

.badge-item.earned .badge-icon {
    animation: none;
}

.badge-item.earned:hover .badge-icon {
    animation: badgeHover 0.6s ease-in-out;
}

@keyframes badgeHover {
    0%, 100% { transform: scale(1) rotate(0deg); }
    50% { transform: scale(1.2) rotate(10deg); }
}

.badge-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.badge-name {
    font-size: 0.9rem;
    font-weight: bold;
    color: var(--text-primary);
}

.badge-description {
    font-size: 0.7rem;
    color: var(--text-secondary);
    line-height: 1.2;
}

/* Badge Rarity Colors */
.badge-item.common.earned {
    border-color: #10b981;
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.3);
}

.badge-item.uncommon.earned {
    border-color: #3b82f6;
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

.badge-item.rare.earned {
    border-color: #8b5cf6;
    box-shadow: 0 0 15px rgba(139, 92, 246, 0.3);
}

.badge-item.epic.earned {
    border-color: #f59e0b;
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.3);
}

.badge-item.legendary.earned {
    border-color: #ef4444;
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.4);
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, rgba(239, 68, 68, 0.1) 100%);
}

.badge-item.legendary.earned .badge-icon {
    animation: legendaryPulse 2s infinite;
}

@keyframes legendaryPulse {
    0%, 100% {
        transform: scale(1);
        filter: drop-shadow(0 0 5px rgba(239, 68, 68, 0.5));
    }
    50% {
        transform: scale(1.05);
        filter: drop-shadow(0 0 10px rgba(239, 68, 68, 0.8));
    }
}

.settings-section {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: var(--border-primary);
    margin-top: 2rem;
}

.settings-section h3 {
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.settings-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    background: var(--bg-tertiary);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    gap: 2rem;
}

.setting-info {
    flex: 1;
}

.setting-info h4 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.setting-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.4;
}

.reset-btn {
    background: linear-gradient(135deg, #dc2626 0%, #ef4444 100%);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(220, 38, 38, 0.3);
}

.reset-btn:hover {
    background: linear-gradient(135deg, #b91c1c 0%, #dc2626 100%);
    transform: var(--hover-transform);
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.4);
}

.reset-btn:active {
    transform: translateY(1px);
}

.reset-icon {
    font-size: 1rem;
    animation: none;
}

.reset-btn:hover .reset-icon {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Reset Confirmation Modal */
.reset-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    backdrop-filter: blur(4px);
}

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

.reset-modal-content {
    background: var(--bg-secondary);
    border: var(--border-primary);
    border-radius: var(--border-radius-large);
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    box-shadow: var(--glow-effect);
    animation: slideUp 0.3s ease-out;
}

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

.reset-modal h3 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.reset-modal p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.reset-modal-buttons {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    flex-wrap: wrap;
}

.reset-confirm-btn {
    background: linear-gradient(135deg, #dc2626 0%, #ef4444 100%);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: bold;
}

.reset-confirm-btn:hover {
    background: linear-gradient(135deg, #b91c1c 0%, #dc2626 100%);
    transform: var(--hover-transform);
}

.reset-cancel-btn {
    background: var(--btn-secondary);
    color: var(--text-primary);
    border: var(--border-secondary);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: bold;
}

.reset-cancel-btn:hover {
    background: var(--btn-hover);
    transform: var(--hover-transform);
}

/* Reset Success Message */
.reset-success {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--success-color);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    z-index: 10000;
    display: none;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    animation: slideInRight 0.3s ease-out;
}

.reset-success.show {
    display: flex;
}

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

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .main {
        padding: 1rem;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .progress-overview {
        flex-direction: column;
        align-items: center;
    }

    .lessons-header {
        flex-direction: column;
        align-items: stretch;
    }

    .lesson-tabs {
        justify-content: center;
    }

    .lesson-card {
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }

    .lesson-header {
        flex-direction: column;
        align-items: stretch;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .project-grid {
        grid-template-columns: 1fr;
    }
}

/* Exercise System Styles */
.exercise-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.exercise-header {
    text-align: center;
    margin-bottom: 3rem;
}

.exercise-header h3 {
    font-size: 2rem;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.exercise-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.exercise-categories {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.exercise-category {
    background: var(--bg-secondary);
    border: var(--border-primary);
    border-radius: var(--border-radius-large);
    overflow: hidden;
    transition: all 0.3s ease;
}

.exercise-category:hover {
    box-shadow: var(--glow-effect);
}

.category-header {
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(var(--accent-primary-rgb), 0.1) 100%);
    border-bottom: var(--border-primary);
}

.category-header h4 {
    font-size: 1.3rem;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.category-header p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.category-progress {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.exercise-list {
    padding: 0;
}

.exercise-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid rgba(var(--accent-primary-rgb), 0.1);
    cursor: pointer;
    transition: all 0.3s ease;
    background: transparent;
    border-radius: 0;
    margin-bottom: 0;
    border-left: none;
    border-right: none;
    border-top: none;
}

.exercise-item:hover {
    background: rgba(var(--accent-primary-rgb), 0.05);
    transform: translateX(5px);
    border-color: var(--accent-primary);
}

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

.exercise-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.exercise-title {
    font-weight: 500;
    color: var(--text-primary);
}

.exercise-points {
    background: var(--accent-primary);
    color: var(--text-inverse);
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: bold;
}

.exercise-status {
    font-size: 1.2rem;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

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

/* Exercise Modal */
.exercise-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    padding: 1rem;
    backdrop-filter: blur(5px);
}

.exercise-modal-content {
    background: var(--bg-secondary);
    border: var(--border-primary);
    border-radius: var(--border-radius-large);
    width: 100%;
    max-width: 900px;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.exercise-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem;
    border-bottom: var(--border-primary);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(var(--accent-primary-rgb), 0.1) 100%);
}

.exercise-modal-header h3 {
    color: var(--accent-primary);
    font-size: 1.5rem;
}

.close-modal-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.close-modal-btn:hover {
    background: rgba(var(--accent-primary-rgb), 0.1);
    color: var(--accent-primary);
}

.exercise-modal-body {
    padding: 1.5rem;
    max-height: calc(90vh - 100px);
    overflow-y: auto;
}

.exercise-problem {
    margin-bottom: 2rem;
}

.exercise-problem h4 {
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.exercise-problem p {
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.exercise-points {
    background: var(--accent-primary);
    color: var(--text-inverse);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    display: inline-block;
    font-weight: bold;
}

.exercise-workspace {
    display: grid;
    gap: 1.5rem;
}

.code-editor h4 {
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

#exercise-code {
    width: 100%;
    min-height: 200px;
    background: var(--bg-primary);
    border: var(--border-primary);
    border-radius: var(--border-radius);
    padding: 1rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
    resize: vertical;
    transition: all 0.3s ease;
}

#exercise-code:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(var(--accent-primary-rgb), 0.2);
}

.exercise-controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.exercise-controls button {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    flex: 1;
    min-width: 120px;
}

.run-btn {
    background: var(--accent-primary);
    color: var(--text-inverse);
}

.run-btn:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
}

.hint-btn {
    background: var(--warning-color);
    color: var(--text-inverse);
}

.hint-btn:hover {
    background: var(--warning-hover);
    transform: translateY(-2px);
}

.answer-btn {
    background: var(--error-color);
    color: var(--text-inverse);
}

.answer-btn:hover {
    background: var(--error-hover);
    transform: translateY(-2px);
}

.exercise-output h4 {
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

#exercise-result {
    background: var(--bg-primary);
    border: var(--border-primary);
    border-radius: var(--border-radius);
    padding: 1rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
    min-height: 100px;
    white-space: pre-wrap;
    overflow-x: auto;
}

.exercise-feedback {
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-top: 1rem;
    border: 2px solid transparent;
}

.exercise-feedback.success {
    background: rgba(var(--success-color-rgb), 0.1);
    border-color: var(--success-color);
    color: var(--success-color);
}

.exercise-feedback.error {
    background: rgba(var(--error-color-rgb), 0.1);
    border-color: var(--error-color);
    color: var(--error-color);
}

.exercise-feedback.warning {
    background: rgba(var(--warning-color-rgb), 0.1);
    border-color: var(--warning-color);
    color: var(--warning-color);
}

.exercise-feedback.hint {
    background: rgba(var(--warning-color-rgb), 0.15);
    border-color: var(--warning-color);
    color: var(--warning-color);
    font-weight: 500;
}

.exercise-feedback.hint p {
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.exercise-feedback p {
    margin: 0.5rem 0;
}

.exercise-feedback code {
    background: rgba(0, 0, 0, 0.2);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

/* Additional responsive styles for exercise system */
@media (max-width: 768px) {
    .exercise-container {
        padding: 1rem;
    }

    .exercise-modal {
        padding: 0.5rem;
    }

    .exercise-modal-content {
        max-height: 95vh;
    }

    .exercise-modal-body {
        padding: 1rem;
    }

    .exercise-controls {
        flex-direction: column;
    }

    .exercise-controls button {
        flex: none;
        min-width: unset;
    }

    .category-progress {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

    .exercise-item {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

    .exercise-info {
        justify-content: space-between;
    }
}

/* ================================
   Calculator App Styles
   ================================ */

.calculator-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.calculator-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: var(--border-secondary);
}

.calculator-header h2 {
    color: var(--accent-primary);
    font-size: 2rem;
    margin: 0;
}

.calculator-progress {
    background: var(--bg-tertiary);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    border: var(--border-secondary);
}

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

#calc-progress {
    color: var(--accent-primary);
    font-weight: bold;
}

.calculator-main {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 2rem;
    min-height: 600px;
}

/* Left Panel - Steps */
.calculator-left {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-large);
    padding: 1.5rem;
    border: var(--border-secondary);
}

.calculator-steps {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.step-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-radius: var(--border-radius);
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    transition: all 0.3s ease;
    cursor: pointer;
}

.step-item.active {
    border-color: var(--accent-primary);
    background: rgba(var(--accent-primary-rgb), 0.1);
}

.step-item.completed {
    border-color: var(--success-color);
    background: var(--success-bg);
}

.step-item:hover {
    transform: var(--hover-transform);
    box-shadow: var(--glow-effect);
}

.step-number {
    width: 2rem;
    height: 2rem;
    background: var(--accent-primary);
    color: var(--text-inverse);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.step-item.completed .step-number {
    background: var(--success-color);
}

.step-content h3 {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.4;
}

/* Right Panel - Task Content */
.calculator-right {
    display: grid;
    grid-template-rows: 1fr auto;
    gap: 1.5rem;
}

.calculator-task {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-large);
    padding: 2rem;
    border: var(--border-secondary);
    position: relative;
}

.task-content {
    display: none;
}

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

.task-content h3 {
    color: var(--accent-primary);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.task-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.task-code {
    background: var(--code-bg);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-bottom: 1.5rem;
    border: var(--border-secondary);
}

.task-code h4 {
    color: var(--accent-secondary);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.task-code pre {
    color: var(--code-text);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.4;
    overflow-x: auto;
}

.task-editor {
    margin-bottom: 1.5rem;
}

.calc-code-editor {
    width: 100%;
    min-height: 120px;
    background: var(--code-bg);
    color: var(--code-text);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    padding: 1rem;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.4;
    resize: vertical;
    transition: border-color 0.3s ease;
}

.calc-code-editor:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(var(--accent-primary-rgb), 0.2);
}

.task-controls {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.task-controls button {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.run-btn {
    background: var(--btn-primary);
    color: var(--text-inverse);
}

.run-btn:hover {
    transform: var(--hover-transform);
    box-shadow: var(--glow-effect-hover);
}

.hint-btn {
    background: var(--btn-info);
    color: var(--text-inverse);
}

.hint-btn:hover {
    background: var(--warning-hover);
    transform: var(--hover-transform);
}

.answer-btn {
    background: var(--btn-warning);
    color: var(--text-inverse);
}

.answer-btn:hover {
    background: var(--warning-hover);
    transform: var(--hover-transform);
}

.next-btn, .complete-btn {
    background: var(--success-color);
    color: var(--text-inverse);
}

.next-btn:hover, .complete-btn:hover {
    background: var(--success-color);
    transform: var(--hover-transform);
    box-shadow: 0 4px 15px rgba(var(--success-color-rgb), 0.3);
}

.next-btn:disabled, .complete-btn:disabled {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.calc-output {
    background: var(--output-bg);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    padding: 1rem;
    font-family: 'Courier New', monospace;
    color: var(--code-text);
    min-height: 2.5rem;
    margin-top: 1rem;
    white-space: pre-wrap;
}

.calc-feedback {
    background: var(--feedback-bg);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-top: 1rem;
    color: var(--text-secondary);
    min-height: 2.5rem;
}

.calc-feedback.success {
    background: var(--success-bg);
    color: var(--success-text);
    border-color: var(--success-color);
}

.calc-feedback.error {
    background: var(--error-bg);
    color: var(--error-text);
    border-color: var(--error-color);
}

/* Calculator Preview */
.calculator-preview {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-large);
    padding: 1.5rem;
    border: var(--border-secondary);
}

.calculator-preview h4 {
    color: var(--accent-primary);
    font-size: 1.25rem;
    margin-bottom: 1rem;
    text-align: center;
}

.preview-area {
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    min-height: 300px;
    border: var(--border-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-placeholder {
    text-align: center;
    color: var(--text-secondary);
}

.preview-placeholder p {
    font-style: italic;
}

/* Actual Calculator Styles */
.calculator-app {
    background: var(--bg-primary);
    border-radius: var(--border-radius-large);
    padding: 1.5rem;
    border: var(--border-primary);
    box-shadow: var(--glow-effect);
    max-width: 300px;
    margin: 0 auto;
}

.calculator-display {
    margin-bottom: 1rem;
}

.calculator-display input {
    width: 100%;
    background: var(--bg-secondary);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    padding: 1rem;
    font-size: 1.5rem;
    text-align: right;
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
}

.calculator-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.calc-btn {
    background: var(--btn-secondary);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    padding: 1rem;
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calc-btn:hover {
    background: var(--btn-hover);
    transform: var(--hover-transform);
}

.calc-btn.operator {
    background: var(--btn-primary);
    color: var(--text-inverse);
}

.calc-btn.operator:hover {
    background: var(--error-hover);
}

.calc-btn.equals {
    background: var(--success-color);
    color: var(--text-inverse);
    grid-column: span 2;
}

.calc-btn.equals:hover {
    background: var(--success-color);
    box-shadow: 0 4px 15px rgba(var(--success-color-rgb), 0.3);
}

.calc-btn.clear {
    background: var(--btn-warning);
    color: var(--text-inverse);
}

.calc-btn.clear:hover {
    background: var(--warning-hover);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .calculator-main {
        grid-template-columns: 250px 1fr;
        gap: 1.5rem;
    }

    .calculator-container {
        padding: 1rem;
    }
}

@media (max-width: 768px) {
    .calculator-main {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .calculator-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }

    .calculator-header h2 {
        text-align: center;
    }

    .step-item {
        padding: 0.75rem;
    }

    .step-content h3 {
        font-size: 0.9rem;
    }

    .step-content p {
        font-size: 0.8rem;
    }

    .task-controls {
        justify-content: center;
    }

    .calc-code-editor {
        min-height: 100px;
    }
}

@media (max-width: 480px) {
    .calculator-container {
        padding: 0.5rem;
    }

    .calculator-task {
        padding: 1rem;
    }

    .task-controls button {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}

/* ================================
   Personality Test Styles
   ================================ */

.personality-test-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

.personality-test-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: var(--border-secondary);
    flex-wrap: wrap;
    gap: 1rem;
}

.personality-test-header h2 {
    color: var(--accent-primary);
    font-size: 2rem;
    margin: 0;
    text-align: center;
    flex: 1;
}

.test-progress {
    display: flex;
    align-items: center;
    gap: 1rem;
    min-width: 200px;
}

.test-progress .progress-bar {
    width: 150px;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.test-progress .progress-fill {
    height: 100%;
    background: var(--progress-gradient);
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    white-space: nowrap;
}

/* Test Screens */
.personality-test-main {
    position: relative;
    min-height: 600px;
}

.test-screen {
    display: none;
    animation: slideIn 0.5s ease;
}

.test-screen.active {
    display: block;
}

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

/* Start Screen */
.test-intro {
    text-align: center;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-large);
    padding: 3rem 2rem;
    border: var(--border-secondary);
}

.intro-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.test-intro h3 {
    color: var(--accent-primary);
    font-size: 2rem;
    margin-bottom: 1rem;
}

.test-intro p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.test-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--bg-tertiary);
    padding: 1rem;
    border-radius: var(--border-radius);
    border: var(--border-secondary);
}

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

.personality-types-preview {
    margin: 2rem 0;
}

.personality-types-preview h4 {
    color: var(--accent-secondary);
    margin-bottom: 1rem;
}

.types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.type-card {
    background: var(--bg-tertiary);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    padding: 0.75rem 0.5rem;
    text-align: center;
    font-size: 0.85rem;
    font-weight: bold;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.type-card:hover {
    transform: var(--hover-transform);
    box-shadow: var(--glow-effect);
    border-color: var(--accent-primary);
}

.type-card small {
    display: block;
    font-weight: normal;
    color: var(--text-secondary);
    font-size: 0.7rem;
    margin-top: 0.25rem;
}

.start-test-btn {
    background: var(--btn-primary);
    color: var(--text-inverse);
    border: none;
    border-radius: var(--border-radius-large);
    padding: 1.25rem 2.5rem;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 2rem auto 0;
    box-shadow: var(--glow-effect);
}

.start-test-btn:hover {
    transform: var(--hover-transform);
    box-shadow: var(--glow-effect-hover);
}

.btn-icon {
    font-size: 1.5rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* Question Screen */
.question-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 500px;
}

.question-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-large);
    padding: 2.5rem;
    border: var(--border-secondary);
    box-shadow: var(--glow-effect);
    max-width: 700px;
    width: 100%;
}

.question-number {
    color: var(--accent-secondary);
    font-size: 1rem;
    font-weight: bold;
    margin-bottom: 1rem;
    text-align: center;
}

.question-text {
    color: var(--text-primary);
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 2rem;
    line-height: 1.4;
}

.answer-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.answer-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--bg-tertiary);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
}

.answer-btn:hover {
    background: var(--btn-hover);
    transform: var(--hover-transform);
    border-color: var(--accent-primary);
}

.answer-btn.selected {
    background: rgba(var(--accent-primary-rgb), 0.2);
    border-color: var(--accent-primary);
    box-shadow: var(--glow-effect);
}

.answer-letter {
    width: 2rem;
    height: 2rem;
    background: var(--accent-primary);
    color: var(--text-inverse);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.answer-text {
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.4;
}

.question-navigation {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
}

.nav-btn {
    background: var(--btn-secondary);
    color: var(--text-primary);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-btn:hover:not(:disabled) {
    background: var(--btn-hover);
    transform: var(--hover-transform);
}

.nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.next-btn:not(:disabled) {
    background: var(--btn-primary);
    color: var(--text-inverse);
}

/* Results Screen */
.results-container {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-large);
    padding: 2.5rem;
    border: var(--border-secondary);
    box-shadow: var(--glow-effect);
}

.results-header {
    text-align: center;
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: var(--border-secondary);
}

.result-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: zoomIn 0.8s ease;
}

@keyframes zoomIn {
    from { transform: scale(0); }
    to { transform: scale(1); }
}

.results-header h3 {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.personality-type {
    color: var(--accent-primary);
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
    text-shadow: var(--text-glow);
    animation: slideIn 1s ease;
}

.personality-name {
    color: var(--accent-secondary);
    font-size: 1.5rem;
    font-weight: 500;
    animation: slideIn 1.2s ease;
}

.results-content {
    display: grid;
    gap: 2rem;
}

.trait-breakdown h4,
.personality-description h4,
.strengths-weaknesses h4,
.career-suggestions h4 {
    color: var(--accent-primary);
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.trait-bars {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.trait-item {
    display: grid;
    grid-template-columns: 1fr 200px 120px;
    align-items: center;
    gap: 1rem;
}

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

.trait-bar {
    height: 20px;
    background: var(--bg-tertiary);
    border-radius: 10px;
    overflow: hidden;
    border: var(--border-secondary);
}

.trait-fill {
    height: 100%;
    background: var(--progress-gradient);
    transition: width 1s ease;
    border-radius: 10px;
}

.trait-value {
    color: var(--accent-secondary);
    font-weight: bold;
    text-align: right;
}

.personality-description p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 1.1rem;
}

.strengths-weaknesses {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.strengths ul,
.weaknesses ul {
    list-style: none;
    padding: 0;
}

.strengths li,
.weaknesses li {
    color: var(--text-primary);
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--bg-tertiary);
    position: relative;
    padding-left: 1.5rem;
}

.strengths li:before {
    content: '✓';
    color: var(--success-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

.weaknesses li:before {
    content: '⚠';
    color: var(--warning-color);
    position: absolute;
    left: 0;
}

.career-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.career-tag {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    border: var(--border-secondary);
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.career-tag:hover {
    transform: var(--hover-transform);
    border-color: var(--accent-primary);
}

.results-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.action-btn {
    background: var(--btn-secondary);
    color: var(--text-primary);
    border: var(--border-secondary);
    border-radius: var(--border-radius);
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.action-btn:hover {
    background: var(--btn-hover);
    transform: var(--hover-transform);
}

.share-btn {
    background: var(--btn-info);
    color: var(--text-inverse);
}

.retry-btn {
    background: var(--btn-warning);
    color: var(--text-inverse);
}

.save-btn {
    background: var(--success-color);
    color: var(--text-inverse);
}

/* Responsive Design */
@media (max-width: 768px) {
    .personality-test-container {
        padding: 1rem;
    }

    .personality-test-header {
        flex-direction: column;
        text-align: center;
    }

    .personality-test-header h2 {
        font-size: 1.5rem;
    }

    .test-intro {
        padding: 2rem 1rem;
    }

    .test-intro h3 {
        font-size: 1.5rem;
    }

    .test-features {
        grid-template-columns: 1fr;
    }

    .types-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .question-card {
        padding: 1.5rem;
    }

    .question-text {
        font-size: 1.2rem;
    }

    .answer-options {
        gap: 0.75rem;
    }

    .answer-btn {
        padding: 1rem;
    }

    .personality-type {
        font-size: 2.5rem;
    }

    .trait-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
        text-align: center;
    }

    .trait-bar {
        order: 2;
    }

    .trait-value {
        order: 3;
        text-align: center;
    }

    .strengths-weaknesses {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .results-actions {
        flex-direction: column;
        align-items: center;
    }

    .action-btn {
        width: 100%;
        max-width: 250px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .test-progress {
        flex-direction: column;
        gap: 0.5rem;
        align-items: center;
    }

    .test-progress .progress-bar {
        width: 200px;
    }

    .question-navigation {
        flex-direction: column;
    }

    .nav-btn {
        width: 100%;
        padding: 1rem;
    }
}

/* Additional Animations for Personality Test */
@keyframes slideInRight {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

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

.test-notification {
    animation: slideInRight 0.5s ease;
}

/* Explanation Page Styles */

.explanation-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

.explanation-nav {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    border-bottom: 2px solid var(--surface-dark);
    padding-bottom: 1rem;
}

.nav-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    background: var(--surface-dark);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    position: relative;
}

.nav-btn:hover {
    background: var(--surface-light);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.nav-btn.active {
    background: var(--accent-primary);
    color: var(--text-inverse);
    box-shadow: var(--glow-effect);
}

.explanation-nav .nav-btn.active {
    background: var(--accent-primary) !important;
    color: var(--text-inverse) !important;
    box-shadow: var(--glow-effect) !important;
    transform: translateY(-2px) !important;
}

.explanation-section {
    display: none;
    padding: 2rem;
    background: var(--surface-light);
    border-radius: var(--border-radius);
    margin: 1rem 0;
}

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

/* Force visibility for debugging */
#mbti-explanation-page.active .explanation-section {
    border: 2px solid red;
    min-height: 200px;
}

#mbti-explanation-page.active .explanation-section.active {
    display: block !important;
    background: var(--surface-light) !important;
}

.section-title {
    font-size: 2rem;
    font-weight: bold;
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
    text-align: center;
}

.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.overview-card {
    background: var(--surface-dark);
    padding: 1.5rem;
    border-radius: var(--border-radius-large);
    border-left: 4px solid var(--accent-primary);
    transition: all 0.3s ease;
}

.overview-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--glow-effect);
}

.overview-card h3 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.overview-card ul {
    list-style: none;
    padding: 0;
}

.overview-card li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--surface-light);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.overview-card li:last-child {
    border-bottom: none;
}

.overview-card li::before {
    content: "✓";
    color: var(--accent-primary);
    font-weight: bold;
}

.structure-diagram {
    background: var(--surface-dark);
    padding: 2rem;
    border-radius: var(--border-radius-large);
    margin: 1.5rem 0;
    text-align: center;
    border: 2px dashed var(--accent-primary);
}

.structure-diagram h4 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.structure-flow {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin: 1rem 0;
}

.flow-item {
    background: var(--btn-primary);
    color: var(--text-inverse);
    padding: 0.75rem 1.25rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    position: relative;
}

.flow-item::after {
    content: "→";
    position: absolute;
    right: -1.5rem;
    color: var(--accent-primary);
    font-weight: bold;
}

.flow-item:last-child::after {
    display: none;
}

.logic-explanation {
    background: var(--surface-light);
    padding: 1.5rem;
    border-radius: var(--border-radius-large);
    margin: 1rem 0;
    border-left: 4px solid var(--warning);
}

.logic-explanation h4 {
    color: var(--warning);
    margin-bottom: 1rem;
}

.mbti-axes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.axis-card {
    background: var(--surface-dark);
    padding: 1.25rem;
    border-radius: var(--border-radius);
    text-align: center;
    transition: all 0.3s ease;
}

.axis-card:hover {
    transform: scale(1.05);
    box-shadow: var(--glow-effect);
}

.axis-card h5 {
    color: var(--accent-primary);
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}

.code-blocks {
    background: var(--bg-dark);
    border: 1px solid var(--surface-light);
    border-radius: var(--border-radius);
    margin: 1rem 0;
}

.code-header {
    background: var(--surface-dark);
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--surface-light);
    color: var(--accent-primary);
    font-weight: 500;
    font-size: 0.9rem;
}

.code-content {
    padding: 1rem;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text-primary);
    overflow-x: auto;
}

.ui-principles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
    margin: 1.5rem 0;
}

.principle-card {
    background: linear-gradient(135deg, var(--surface-dark), var(--surface-light));
    padding: 1.5rem;
    border-radius: var(--border-radius-large);
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid var(--accent-primary);
}

.principle-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--glow-effect-hover);
}

.principle-card h4 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.learning-points {
    background: var(--success);
    color: var(--text-inverse);
    padding: 1.5rem;
    border-radius: var(--border-radius-large);
    margin: 2rem 0;
}

.learning-points h4 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.learning-points ul {
    list-style: none;
    padding: 0;
}

.learning-points li {
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.learning-points li::before {
    content: "🎯";
    font-size: 1.1rem;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(50px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Source Code Modal Styles */
.source-code-modal .modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--surface-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.source-code-modal .modal-header h3 {
    margin: 0;
    color: var(--accent-primary);
}

.source-code-modal .close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

.source-code-modal .close-modal:hover {
    background: var(--surface-light);
    color: var(--text-primary);
}

.source-code-modal .modal-body {
    padding: 1.5rem;
}

.source-code-modal .source-info {
    display: grid;
    gap: 1rem;
    margin: 1.5rem 0;
}

.source-code-modal .file-info {
    background: var(--surface-dark);
    padding: 1rem;
    border-radius: var(--border-radius);
    border-left: 3px solid var(--accent-primary);
}

.source-code-modal .file-info h4 {
    margin: 0 0 0.5rem 0;
    color: var(--accent-primary);
}

.source-code-modal .file-info p {
    margin: 0 0 0.75rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.source-code-modal .file-info ul {
    margin: 0;
    padding-left: 1.25rem;
}

.source-code-modal .file-info li {
    margin-bottom: 0.25rem;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.source-code-modal .tech-stack {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--surface-light);
}

.source-code-modal .tech-stack h4 {
    margin: 0 0 1rem 0;
    color: var(--text-primary);
}

.source-code-modal .tech-tag {
    display: inline-block;
    background: var(--accent-primary);
    color: var(--text-inverse);
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius);
    font-size: 0.8rem;
    margin: 0.25rem 0.5rem 0.25rem 0;
    font-weight: 500;
}

.source-code-modal .modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--surface-light);
    text-align: right;
}

.source-code-modal .btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.source-code-modal .btn.secondary {
    background: var(--surface-light);
    color: var(--text-primary);
}

.source-code-modal .btn.secondary:hover {
    background: var(--surface-dark);
    transform: translateY(-1px);
}

/* Mobile responsiveness for explanation page */
@media (max-width: 768px) {
    .explanation-container {
        padding: 1rem;
    }

    .explanation-nav {
        gap: 0.25rem;
    }

    .nav-btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .overview-grid,
    .mbti-axes,
    .ui-principles {
        grid-template-columns: 1fr;
    }

    .structure-flow {
        flex-direction: column;
        gap: 0.5rem;
    }

    .flow-item::after {
        content: "↓";
        right: auto;
        bottom: -1.5rem;
        left: 50%;
        transform: translateX(-50%);
    }

    .flow-item:last-child::after {
        display: none;
    }
}
}