/* ========================================
   GLOBAL STYLES & RESET
======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    
    /* Steel Category Colors */
    --austenitic-color: #3b82f6;
    --ferritic-color: #8b5cf6;
    --martensitic-color: #ef4444;
    --duplex-color: #10b981;
    --ph-color: #f59e0b;
    
    /* Neutral Colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #475569;
    
    /* Typography */
    --font-primary: 'Inter', sans-serif;
    --font-heading: 'Space Grotesk', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.4);
}

body {
    font-family: var(--font-primary);
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ========================================
   HERO SECTION
======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: float 20s infinite ease-in-out;
}

.particle:nth-child(1) {
    width: 80px;
    height: 80px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.particle:nth-child(2) {
    width: 120px;
    height: 120px;
    top: 60%;
    left: 80%;
    animation-delay: 2s;
}

.particle:nth-child(3) {
    width: 60px;
    height: 60px;
    top: 40%;
    left: 20%;
    animation-delay: 4s;
}

.particle:nth-child(4) {
    width: 100px;
    height: 100px;
    top: 80%;
    left: 60%;
    animation-delay: 6s;
}

.particle:nth-child(5) {
    width: 90px;
    height: 90px;
    top: 20%;
    left: 70%;
    animation-delay: 8s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) translateX(0) scale(1);
        opacity: 0.3;
    }
    25% {
        transform: translateY(-50px) translateX(30px) scale(1.1);
        opacity: 0.5;
    }
    50% {
        transform: translateY(-100px) translateX(-30px) scale(0.9);
        opacity: 0.4;
    }
    75% {
        transform: translateY(-50px) translateX(-50px) scale(1.05);
        opacity: 0.6;
    }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    animation: fadeInUp 1s ease-out;
}

.hero-icon {
    font-size: 5rem;
    margin-bottom: var(--spacing-md);
    animation: rotate360 3s infinite linear;
}

.hero-icon i {
    color: white;
    filter: drop-shadow(0 0 20px rgba(255, 255, 255, 0.5));
}

@keyframes rotate360 {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    background: linear-gradient(to right, #fff, #f0f0f0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.95;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

.btn-start {
    padding: 1rem 2.5rem;
    font-size: 1.2rem;
    font-weight: 600;
    background: white;
    color: #667eea;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.btn-start:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.btn-start i {
    margin-right: var(--spacing-xs);
}

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

/* ========================================
   SECTION TITLE
======================================== */
.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title i {
    margin-right: var(--spacing-sm);
    color: var(--accent-color);
}

/* ========================================
   QUICK REFERENCE CARDS
======================================== */
.quick-reference {
    padding: var(--spacing-xl) 0;
    background: var(--bg-primary);
}

.steel-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.steel-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.steel-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, transparent, currentColor, transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.steel-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.steel-card:hover::before {
    opacity: 1;
}

.steel-card.austenitic {
    border-color: var(--austenitic-color);
    color: var(--austenitic-color);
}

.steel-card.ferritic {
    border-color: var(--ferritic-color);
    color: var(--ferritic-color);
}

.steel-card.martensitic {
    border-color: var(--martensitic-color);
    color: var(--martensitic-color);
}

.steel-card.duplex {
    border-color: var(--duplex-color);
    color: var(--duplex-color);
}

.steel-card.ph {
    border-color: var(--ph-color);
    color: var(--ph-color);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.steel-card h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.steel-card ul {
    list-style: none;
    text-align: left;
}

.steel-card ul li {
    padding: var(--spacing-xs) 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.steel-card ul li i {
    margin-right: var(--spacing-xs);
    width: 16px;
}

.steel-card ul li .fa-check {
    color: var(--success-color);
}

.steel-card ul li .fa-times {
    color: var(--error-color);
}

/* ========================================
   DRAG AND DROP SECTION
======================================== */
.drag-drop-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-secondary);
}

.exercise-instruction {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.drag-drop-game {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.properties-pool {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    min-height: 100px;
}

.draggable-property {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    cursor: move;
    transition: all 0.3s ease;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

.draggable-property:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.draggable-property.dragging {
    opacity: 0.5;
    transform: scale(0.95);
}

.draggable-property i {
    margin-right: var(--spacing-xs);
}

.drop-zones {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.drop-zone {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
}

.drop-zone h4 {
    font-family: var(--font-heading);
    margin-bottom: var(--spacing-md);
    color: var(--accent-color);
    font-size: 1.1rem;
}

.drop-area {
    min-height: 80px;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.drop-area.drag-over {
    border-color: var(--accent-color);
    background: rgba(245, 158, 11, 0.1);
    border-style: solid;
}

.drop-area.correct {
    background: rgba(16, 185, 129, 0.2);
    border-color: var(--success-color);
    border-style: solid;
}

.drop-area.incorrect {
    background: rgba(239, 68, 68, 0.2);
    border-color: var(--error-color);
    border-style: solid;
}

.btn-reset {
    display: block;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-card);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-reset:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.drag-feedback {
    text-align: center;
    margin-top: var(--spacing-md);
    font-size: 1.1rem;
    font-weight: 600;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
}

.drag-feedback.success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
}

.drag-feedback.error {
    background: rgba(239, 68, 68, 0.2);
    color: var(--error-color);
}

/* ========================================
   QUIZ SECTION
======================================== */
.quiz-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-primary);
}

.quiz-header {
    margin-bottom: var(--spacing-lg);
}

.quiz-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

.stat-item {
    background: var(--bg-card);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.stat-item i {
    font-size: 1.5rem;
    color: var(--accent-color);
}

/* Progress Bar */
.progress-container {
    width: 100%;
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 10px;
    transition: width 0.5s ease;
    width: 0%;
}

/* Quiz Container */
.quiz-container {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    min-height: 500px;
}

.question-card {
    animation: slideIn 0.5s ease-out;
}

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

.question-number {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.question-text {
    font-size: 1.4rem;
    font-weight: 600;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.trap-indicator {
    display: inline-block;
    background: var(--warning-color);
    color: var(--bg-primary);
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 700;
    margin-left: var(--spacing-sm);
}

.options-container {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.option {
    background: var(--bg-card);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    display: flex;
    align-items: center;
    position: relative;
}

.option:hover {
    background: var(--bg-primary);
    border-color: var(--primary-color);
    transform: translateX(8px);
}

.option.selected {
    background: var(--bg-primary);
    border-color: var(--accent-color);
}

.option.correct {
    background: rgba(16, 185, 129, 0.2);
    border-color: var(--success-color);
}

.option.incorrect {
    background: rgba(239, 68, 68, 0.2);
    border-color: var(--error-color);
}

.option.disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.option-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    margin-right: var(--spacing-md);
    flex-shrink: 0;
}

.option.correct .option-letter {
    background: var(--success-color);
}

.option.incorrect .option-letter {
    background: var(--error-color);
}

.option-text {
    flex: 1;
    font-size: 1.05rem;
}

.option-icon {
    margin-left: auto;
    font-size: 1.5rem;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.option.correct .option-icon {
    opacity: 1;
    color: var(--success-color);
}

.option.incorrect .option-icon {
    opacity: 1;
    color: var(--error-color);
}

/* Explanation Section */
.explanation-container {
    background: var(--bg-primary);
    border-left: 4px solid var(--info-color);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-lg);
    animation: fadeIn 0.5s ease-out;
}

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

.explanation-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: var(--spacing-md);
}

.explanation-section {
    margin-bottom: var(--spacing-md);
}

.explanation-section h4 {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.explanation-section p {
    color: var(--text-primary);
    line-height: 1.7;
    padding-left: var(--spacing-lg);
}

.explanation-section.correct-answer {
    background: rgba(16, 185, 129, 0.1);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
}

.explanation-section.why-fail {
    background: rgba(239, 68, 68, 0.1);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
}

.explanation-section.keyword {
    background: rgba(245, 158, 11, 0.1);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
}

.explanation-section.model-answer {
    background: rgba(99, 102, 241, 0.1);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
}

/* Quiz Navigation */
.quiz-navigation {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.btn-nav {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
    font-weight: 600;
    background: var(--bg-card);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-nav:hover:not(:disabled) {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-nav.btn-next,
.btn-nav.btn-submit {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-nav.btn-submit {
    background: var(--success-color);
    border-color: var(--success-color);
}

/* ========================================
   RESULTS SECTION
======================================== */
.results-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-secondary);
}

.results-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.confetti-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    background: var(--accent-color);
    animation: confettiFall 3s ease-out forwards;
}

@keyframes confettiFall {
    0% {
        transform: translateY(-100vh) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

.results-icon {
    font-size: 5rem;
    color: var(--accent-color);
    margin-bottom: var(--spacing-md);
    animation: bounce 1s ease-out;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    25% { transform: translateY(-30px); }
    50% { transform: translateY(0); }
    75% { transform: translateY(-15px); }
}

.results-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
}

.final-score {
    margin-bottom: var(--spacing-xl);
}

.score-circle {
    display: inline-flex;
    align-items: baseline;
    justify-content: center;
    width: 180px;
    height: 180px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-glow);
}

.score-circle span {
    font-size: 4rem;
    font-weight: 800;
    color: white;
}

.score-circle .score-total {
    font-size: 2rem;
    opacity: 0.8;
}

.score-message {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--accent-color);
}

.performance-analysis {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
}

.performance-analysis h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.analysis-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.analysis-item {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.analysis-item i {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.results-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.btn-action {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
    font-weight: 600;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-action:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.btn-action.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
}

/* ========================================
   MANTRA SECTION
======================================== */
.mantra-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.mantra-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.mantra-content {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.mantra-text {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 2;
    color: white;
}

.mantra-text .highlight {
    background: rgba(245, 158, 11, 0.3);
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 700;
    color: var(--accent-color);
}

.btn-copy {
    display: block;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-xl);
    background: white;
    color: var(--primary-color);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 700;
    transition: all 0.3s ease;
}

.btn-copy:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* ========================================
   CHECKLIST SECTION
======================================== */
.checklist-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-primary);
}

.checklist-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.checklist-item {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.checklist-item:hover {
    transform: translateY(-8px);
    border-color: var(--accent-color);
    box-shadow: var(--shadow-lg);
}

.checklist-icon {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: var(--spacing-md);
}

.checklist-item h4 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

/* ========================================
   ANSWER SHEET SECTION
======================================== */
.answer-sheet-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-secondary);
}

.answer-sheet {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.answer-item {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--success-color);
}

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

.answer-question-num {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-color);
}

.answer-correct {
    background: var(--success-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.answer-question-text {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    line-height: 1.6;
}

.answer-explanation {
    color: var(--text-secondary);
    line-height: 1.7;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
}

.btn-print {
    display: block;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.btn-print:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   FOOTER
======================================== */
.footer {
    background: var(--bg-primary);
    padding: var(--spacing-xl) 0;
    text-align: center;
    color: var(--text-secondary);
}

.footer p {
    margin: var(--spacing-xs) 0;
}

/* ========================================
   RESPONSIVE DESIGN
======================================== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .steel-cards {
        grid-template-columns: 1fr;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .question-text {
        font-size: 1.2rem;
    }
    
    .quiz-container {
        padding: var(--spacing-md);
    }
    
    .score-circle {
        width: 150px;
        height: 150px;
    }
    
    .score-circle span {
        font-size: 3rem;
    }
    
    .mantra-text {
        font-size: 1.2rem;
    }
    
    .drop-zones {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   PRINT STYLES
======================================== */
@media print {
    .hero,
    .quick-reference,
    .drag-drop-section,
    .quiz-section,
    .mantra-section,
    .checklist-section,
    .footer,
    .btn-print {
        display: none;
    }
    
    .answer-sheet-section {
        background: white;
        color: black;
    }
    
    .answer-item {
        page-break-inside: avoid;
        background: white;
        border: 1px solid #ccc;
    }
}

/* ========================================
   UTILITY ANIMATIONS
======================================== */
.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.shake {
    animation: shake 0.5s;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}