:root {
    --primary-blue: #1e88e5;
    --dark-blue: #1565c0;
    --light-blue: #64b5f6;
    --accent-blue: #2196f3;
    --black: #212121;
    --dark-gray: #424242;
    --light-gray: #f5f5f5;
    --white: #ffffff;
    --shadow: rgba(30, 136, 229, 0.15);
    --shadow-dark: rgba(0, 0, 0, 0.1);
    --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: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    color: var(--black);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header Animations */
header {
    text-align: center;
    margin-bottom: 3rem;
}

.header-animate {
    animation: slideInDown 0.8s ease-out;
}

.logo {
    max-width: 200px;
    margin-bottom: 1.5rem;
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.05);
}

.main-title {
    font-family: 'Playfair Display', serif;
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
    position: relative;
}

.title-underline {
    width: 80px;
    height: 4px;
    background: var(--primary-blue);
    margin: 0 auto;
    border-radius: 2px;
    animation: expandWidth 1s ease-out 0.5s both;
}

/* Card Styles */
.quiz-intro, .quiz-container, .result-container, .certificate-container {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 3rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    margin-bottom: 2rem;
    position: relative;
    /* Removed overflow: hidden; to prevent potential clipping issues with html2canvas */
}

.quiz-intro::before,
.quiz-container::before,
.result-container::before,
.certificate-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-blue);
}

/* Quiz Introduction */
.quiz-intro h2 {
    font-family: 'Playfair Display', serif;
    font-size: 2.2rem;
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
    text-align: center;
}

.intro-text {
    font-size: 1.1rem;
    color: var(--dark-gray);
    text-align: center;
    margin-bottom: 2rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.feature {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--light-gray);
    border-radius: 8px;
    transition: var(--transition);
}

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

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}


.btn-primary {
    background: var(--primary-blue);
    color: var(--white);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow);
}

.btn-secondary {
    background: var(--light-gray);
    color: var(--dark-gray);
}

.btn-secondary:hover {
    background: var(--primary-blue);
    color: var(--white);
}

.btn-outline {
    background: transparent;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.btn-outline:hover {
    background: var(--primary-blue);
    color: var(--white);
}

.btn-arrow {
    transition: var(--transition);
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* Progress Bar */
.quiz-header {
    margin-bottom: 2rem;
}

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

.progress-bar {
    flex: 1;
    height: 8px;
    background: var(--light-gray);
    border-radius: 4px;
    overflow: hidden;
}

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

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

.progress-text {
    font-weight: 600;
    color: var(--dark-gray);
    white-space: nowrap;
}

/* Question Styles */
.question-container {
    margin-bottom: 2rem;
}

.question {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--black);
    margin-bottom: 2rem;
    line-height: 1.4;
}

.options {
    list-style: none;
    display: grid;
    gap: 1rem;
}

.option {
    background: var(--light-gray);
    border-radius: 8px;
    padding: 1.25rem;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.option::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(30, 136, 229, 0.1), transparent);
    transition: left 0.3s;
}

.option:hover::before {
    left: 100%;
}

.option:hover {
    transform: translateX(8px);
    border-color: var(--light-blue);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.option.selected {
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-blue));
    color: var(--white);
    border-color: var(--dark-blue);
    transform: translateX(8px);
}

.option.selected::before {
    display: none;
}

/* Controls */
.controls {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
    gap: 1rem;
}

/* Score Card */
.score-card {
    text-align: center;
    margin-bottom: 3rem;
}

.score-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: bounce 1s ease-out;
}

.score-card h2 {
    font-family: 'Playfair Display', serif;
    font-size: 2.5rem;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.score-label {
    font-size: 1.2rem;
    color: var(--dark-gray);
    margin-bottom: 1rem;
}

.score {
    font-family: 'Playfair Display', serif;
    font-size: 4rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin: 1.5rem 0;
    display: inline-block;
}

.score-total {
    color: var(--dark-gray);
    font-size: 2.5rem;
}

.animate-score {
    animation: scaleIn 0.8s ease-out;
}

.feedback-text {
    font-size: 1.1rem;
    color: var(--dark-gray);
    max-width: 500px;
    margin: 0 auto;
}

/* Certificate Form */
.certificate-form {
    background: var(--light-gray);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
}

.certificate-form h3 {
    font-family: 'Playfair Display', serif;
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--black);
}

.form-input {
    width: 100%;
    padding: 1rem;
    border: 2px solid transparent;
    border-radius: 8px;
    font-size: 1rem;
    background: var(--white);
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px var(--shadow);
}

/* Certificate Styles */
.certificate-preview {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

.certificate {
    background: var(--white);
    max-width: 700px;
    width: 100%;
    position: relative;
    color: var(--black);
}

.certificate-border {
    border: 8px solid var(--primary-blue);
    padding: 3rem;
    position: relative;
}

.certificate-border::before {
    content: '';
    position: absolute;
    top: 12px;
    left: 12px;
    right: 12px;
    bottom: 12px;
    border: 2px solid var(--black);
}

.certificate-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.certificate-logo {
    max-width: 150px;
    margin-bottom: 1.5rem;
}

.certificate-title {
    font-family: 'Playfair Display', serif;
    font-size: 2.2rem;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.certificate-divider {
    width: 100px;
    height: 3px;
    background: var(--black);
    margin: 1rem auto;
}

.certificate-subtitle {
    font-size: 1.1rem;
    color: var(--black);
    margin-bottom: 0.5rem;
}

.certificate-name {
    font-family: 'Playfair Display', serif;
    font-size: 2.5rem;
    color: var(--black);
    margin: 1.5rem 0;
    font-weight: 700;
    text-decoration: underline;
    /* text-decoration-color: var(--primary-blue); */
    text-underline-offset: 8px;
}

.certificate-course {
    font-family: 'Playfair Display', serif;
    font-size: 1.8rem;
    color: var(--primary-blue);
    margin: 1.5rem 0;
    font-weight: 600;
}

.certificate-details {
    margin: 2rem 0;
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.detail-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.detail-label {
    font-weight: 600;
    color: var(--black);
    font-size: 0.9rem;
}

.detail-value {
    color: var(--primary-blue);
    font-weight: 700;
    font-size: 1.1rem;
}

.certificate-signature {
    margin-top: 3rem;
}

.signature-line {
    width: 200px;
    height: 2px;
    background: var(--black);
    margin: 0 auto 1rem;
}

.signature-text {
    font-family: 'Playfair Display', serif;
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--black);
    margin-bottom: 0.5rem;
}

.signature-subtitle {
    font-size: 1rem;
    color: var(--dark-gray);
    font-style: italic;
}

/* Confetti Animation */
.confetti-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    background: var(--primary-blue);
    animation: confetti-fall 3s linear forwards;
}

.confetti:nth-child(2n) {
    background: var(--accent-blue);
    animation-delay: 0.1s;
}

.confetti:nth-child(3n) {
    background: var(--dark-blue);
    animation-delay: 0.2s;
}

.confetti:nth-child(4n) {
    background: var(--light-blue);
    animation-delay: 0.3s;
}

/* Utility Classes */
.hide {
    display: none !important;
}

/* Animations */
@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slide-in-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

@keyframes expandWidth {
    from {
        width: 0;
    }
    to {
        width: 80px;
    }
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-30px);
    }
    60% {
        transform: translateY(-15px);
    }
}

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

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

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 var(--shadow);
    }
    70% {
        box-shadow: 0 0 0 10px transparent;
    }
    100% {
        box-shadow: 0 0 0 0 transparent;
    }
}

.pulse {
    animation: pulse 2s infinite;
}

.slide-in-up {
    animation: slide-in-up 0.6s ease-out;
}

.fade-in {
    animation: fade-in 0.5s ease-out;
}

.scale-in {
    animation: scale-in 0.6s ease-out;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .quiz-intro, .quiz-container, .result-container, .certificate-container {
        padding: 2rem;
    }
    
    .main-title {
        font-size: 2.2rem;
    }
    
    .certificate-border {
        padding: 2rem;
    }
    
    .certificate-title {
        font-size: 1.8rem;
    }
    
    .certificate-name {
        font-size: 2rem;
    }
    
    .certificate-details {
        flex-direction: column;
        gap: 1rem;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    .controls {
        flex-direction: column;
    }
    
    .btn {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .score {
        font-size: 3rem;
    }
    
    .score-total {
        font-size: 2rem;
    }
}