/* ============================================
   PRODUCT INTRO PAGES - MASTER STYLESHEET
   Version: 1.0.0
   ============================================ */

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
    /* Primary Colors */
    --pi-primary: #4f46e5;
    --pi-primary-hover: #4338ca;
    --pi-primary-light: #eef2ff;
    --pi-secondary: #10b981;
    --pi-secondary-hover: #059669;
    
    /* Neutral Colors */
    --pi-text-primary: #111827;
    --pi-text-secondary: #6b7280;
    --pi-text-muted: #9ca3af;
    --pi-border: #e5e7eb;
    --pi-bg-light: #f9fafb;
    --pi-bg-white: #ffffff;
    
    /* Status Colors */
    --pi-success: #10b981;
    --pi-warning: #f59e0b;
    --pi-error: #ef4444;
    --pi-info: #3b82f6;
    
    /* Shadows */
    --pi-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --pi-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --pi-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --pi-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --pi-shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Border Radius */
    --pi-radius-sm: 0.375rem;
    --pi-radius: 0.5rem;
    --pi-radius-lg: 0.75rem;
    --pi-radius-xl: 1rem;
    --pi-radius-2xl: 1.5rem;
    
    /* Transitions */
    --pi-transition: all 0.2s ease;
    --pi-transition-slow: all 0.3s ease;
}

html[data-theme="dark"] {
    --pi-primary-light: rgba(67, 56, 202, 0.18);
    --pi-secondary: #047857;
    --pi-secondary-hover: #065f46;
    --pi-text-primary: #e2e8f0;
    --pi-text-secondary: #cbd5e1;
    --pi-text-muted: #94a3b8;
    --pi-border: rgba(255, 255, 255, 0.1);
    --pi-bg-light: #1a1a2e;
    --pi-bg-white: #1e1e32;
    --pi-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.32);
    --pi-shadow: 0 1px 3px rgba(0, 0, 0, 0.35), 0 1px 2px rgba(0, 0, 0, 0.28);
    --pi-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.35), 0 2px 4px rgba(0, 0, 0, 0.28);
    --pi-shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4), 0 4px 6px rgba(0, 0, 0, 0.3);
    --pi-shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.45), 0 8px 10px rgba(0, 0, 0, 0.32);
}

/* ============================================
   BASE STYLES
   ============================================ */
.product-intro-page {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--pi-text-primary);
    line-height: 1.6;
    background: var(--pi-bg-light);
}

html[data-theme="dark"] .product-intro-page .category-badge {
    background-color: rgba(15, 23, 42, 0.82) !important;
    color: #e2e8f0;
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.product-intro-page * {
    box-sizing: border-box;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ============================================
   BREADCRUMBS
   ============================================ */
.breadcrumbs {
    padding: 1rem 0;
    background: var(--pi-bg-white);
    border-bottom: 1px solid var(--pi-border);
}

.breadcrumbs-list {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 0.875rem;
}

.breadcrumbs-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumbs-list a {
    color: var(--pi-text-secondary);
    text-decoration: none;
    transition: var(--pi-transition);
}

.breadcrumbs-list a:hover {
    color: var(--pi-primary);
}

.breadcrumbs-list .current {
    color: var(--pi-text-primary);
    font-weight: 500;
}

.breadcrumb-separator {
    color: var(--pi-text-muted);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero-section {
    background: linear-gradient(135deg, var(--pi-bg-white) 0%, var(--pi-primary-light) 100%);
    padding: 3rem 0;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 3rem;
    align-items: start;
}

.hero-image-container {
    position: relative;
    border-radius: var(--pi-radius-xl);
    overflow: hidden;
    box-shadow: var(--pi-shadow-xl);
}

.hero-image {
    width: 100%;
    height: auto;
    display: block;
}

.product-badges {
    position: absolute;
    top: 1rem;
    left: 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.375rem 0.75rem;
    border-radius: var(--pi-radius);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-popular {
    background: var(--pi-warning);
    color: #fff;
}

.badge-new {
    background: var(--pi-secondary);
    color: #fff;
}

.badge-sale {
    background: var(--pi-error);
    color: #fff;
}

.hero-content {
    padding: 1rem 0;
}

.product-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--pi-primary-light);
    color: var(--pi-primary);
    border-radius: var(--pi-radius);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.product-title {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin: 0 0 1rem;
    color: var(--pi-text-primary);
}

.product-rating {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.stars {
    display: flex;
    gap: 0.125rem;
}

.star {
    color: var(--pi-text-muted);
    font-size: 1.25rem;
}

.star.filled {
    color: var(--pi-warning);
}

.rating-count {
    color: var(--pi-text-secondary);
    font-size: 0.875rem;
}

.rating-count a {
    color: var(--pi-primary);
    text-decoration: none;
}

.rating-count a:hover {
    text-decoration: underline;
}

.product-tagline {
    font-size: 1.25rem;
    color: var(--pi-text-secondary);
    margin-bottom: 1.5rem;
}

.key-features {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem;
}

.key-features li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.5rem 0;
}

.feature-icon {
    flex-shrink: 0;
    width: 1.5rem;
    height: 1.5rem;
    background: var(--pi-secondary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
}

/* ============================================
   INTRO GRID LAYOUT
   ============================================ */
.intro-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.intro-content {
    min-width: 0;
}

.intro-sidebar {
    position: relative;
}

/* Pricing card in sidebar - NOT sticky to avoid overlapping other cards */
.intro-sidebar .pricing-card {
    position: relative;
    top: 0;
    margin-bottom: 1.5rem;
}

@media (max-width: 900px) {
    .intro-grid {
        grid-template-columns: 1fr;
    }
    
    .intro-sidebar {
        order: -1;
    }
}

/* ============================================
   PRICING CARD (STICKY SIDEBAR)
   ============================================ */
.pricing-card {
    position: sticky;
    top: 1.5rem;
    background: var(--pi-bg-white);
    border-radius: var(--pi-radius-xl);
    box-shadow: var(--pi-shadow-lg);
    padding: 1.5rem;
    border: 1px solid var(--pi-border);
}

.price-display {
    text-align: center;
    margin-bottom: 1.5rem;
}

.current-price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--pi-primary);
}

.original-price {
    font-size: 1.25rem;
    color: var(--pi-text-muted);
    text-decoration: line-through;
    margin-left: 0.5rem;
}

.discount-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background: var(--pi-error);
    color: #fff;
    border-radius: var(--pi-radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 0.5rem;
}

.duration-selector {
    margin-bottom: 1.5rem;
}

.duration-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--pi-text-secondary);
    margin-bottom: 0.5rem;
}

.duration-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

.duration-option {
    position: relative;
    padding: 0.75rem 1rem;
    border: 2px solid var(--pi-border);
    border-radius: var(--pi-radius);
    cursor: pointer;
    transition: var(--pi-transition);
    background: var(--pi-bg-white);
}

.duration-option:hover {
    border-color: var(--pi-primary);
}

.duration-option.selected {
    border-color: var(--pi-primary);
    background: var(--pi-primary-light);
}

.duration-option input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.duration-name {
    display: block;
    font-weight: 500;
    font-size: 0.875rem;
}

.duration-price {
    display: block;
    font-size: 0.75rem;
    color: var(--pi-text-secondary);
}

.duration-option.best-value::after {
    content: 'BEST VALUE';
    position: absolute;
    top: -0.5rem;
    right: 0.5rem;
    padding: 0.125rem 0.5rem;
    background: var(--pi-secondary);
    color: #fff;
    font-size: 0.625rem;
    font-weight: 700;
    border-radius: var(--pi-radius-sm);
}

/* CTA Buttons */
.cta-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border-radius: var(--pi-radius);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: var(--pi-transition);
}

.btn-primary {
    background: var(--pi-primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--pi-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--pi-shadow-md);
}

.btn-secondary {
    background: var(--pi-bg-white);
    color: var(--pi-primary);
    border: 2px solid var(--pi-primary);
}

.btn-secondary:hover {
    background: var(--pi-primary-light);
}

.btn-success {
    background: var(--pi-secondary);
    color: #fff;
}

.btn-success:hover {
    background: var(--pi-secondary-hover);
}

.btn-disabled {
    background: var(--pi-text-muted);
    cursor: not-allowed;
    opacity: 0.6;
}

/* Trust Signals */
.trust-signals {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--pi-border);
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--pi-text-secondary);
}

.trust-icon {
    color: var(--pi-secondary);
}

/* ============================================
   VALUE PROPS SECTION
   ============================================ */
.value-props-section {
    padding: 4rem 0;
    background: var(--pi-bg-white);
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 2.5rem;
    color: var(--pi-text-primary);
}

.value-props-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.value-prop {
    text-align: center;
    padding: 1.5rem;
}

.value-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.value-prop h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.value-prop p {
    font-size: 0.875rem;
    color: var(--pi-text-secondary);
    margin: 0;
}

/* ============================================
   PRODUCT DETAILS SECTION
   ============================================ */
.product-details-section {
    padding: 4rem 0;
    background: var(--pi-bg-light);
}

.description-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--pi-text-secondary);
}

/* ============================================
   LEARNING OUTCOMES
   ============================================ */
.learning-outcomes-section {
    padding: 4rem 0;
    background: var(--pi-bg-white);
}

.outcomes-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.outcome-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    background: var(--pi-bg-light);
    border-radius: var(--pi-radius);
}

.outcome-icon {
    flex-shrink: 0;
    width: 2rem;
    height: 2rem;
    background: var(--pi-secondary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.outcome-item p {
    margin: 0;
    font-size: 0.9375rem;
}

/* ============================================
   FAQ SECTION
   ============================================ */
.faq-section {
    padding: 4rem 0;
    background: var(--pi-bg-light);
}

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

.faq-item {
    background: var(--pi-bg-white);
    border-radius: var(--pi-radius);
    margin-bottom: 1rem;
    box-shadow: var(--pi-shadow-sm);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 1.25rem 1.5rem;
    background: none;
    border: none;
    text-align: left;
    font-size: 1rem;
    font-weight: 600;
    color: var(--pi-text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--pi-transition);
}

.faq-question:hover {
    background: var(--pi-bg-light);
}

.faq-icon {
    font-size: 1.25rem;
    transition: var(--pi-transition);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 1.5rem 1.25rem;
    margin: 0;
    color: var(--pi-text-secondary);
    line-height: 1.7;
}

/* ============================================
   FREQUENTLY BOUGHT TOGETHER
   ============================================ */
.fbt-section {
    padding: 4rem 0;
    background: var(--pi-bg-white);
}

.fbt-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.fbt-item {
    text-align: center;
    padding: 1rem;
    background: var(--pi-bg-light);
    border-radius: var(--pi-radius);
    transition: var(--pi-transition);
    max-width: 180px;
}

.fbt-item:hover {
    box-shadow: var(--pi-shadow-md);
}

.fbt-item img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: var(--pi-radius-sm);
    margin-bottom: 0.75rem;
}

.fbt-item h5 {
    font-size: 0.875rem;
    margin: 0 0 0.25rem;
    font-weight: 500;
}

.fbt-item .price {
    font-size: 0.875rem;
    color: var(--pi-primary);
    font-weight: 600;
}

.fbt-plus {
    font-size: 1.5rem;
    color: var(--pi-text-muted);
}

.fbt-total {
    text-align: center;
    padding: 1.5rem;
    background: var(--pi-primary-light);
    border-radius: var(--pi-radius);
}

.fbt-total .total-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--pi-primary);
}

.fbt-total .original-total {
    font-size: 1rem;
    color: var(--pi-text-muted);
    text-decoration: line-through;
}

.fbt-total .savings {
    display: block;
    font-size: 0.875rem;
    color: var(--pi-secondary);
    font-weight: 500;
    margin-top: 0.25rem;
}

/* ============================================
   RELATED PRODUCTS
   ============================================ */
.related-products-section {
    padding: 4rem 0;
    background: var(--pi-bg-light);
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.product-card {
    background: var(--pi-bg-white);
    border-radius: var(--pi-radius-lg);
    overflow: hidden;
    box-shadow: var(--pi-shadow);
    transition: var(--pi-transition);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--pi-shadow-lg);
}

.product-card-image {
    width: 100%;
    height: 150px;
    object-fit: cover;
}

.product-card-body {
    padding: 1.25rem;
}

.product-card-category {
    font-size: 0.75rem;
    color: var(--pi-primary);
    text-transform: uppercase;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.product-card h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 0.5rem;
}

.product-card h4 a {
    color: var(--pi-text-primary);
    text-decoration: none;
}

.product-card h4 a:hover {
    color: var(--pi-primary);
}

.product-card-price {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--pi-primary);
}

/* ============================================
   CART SIDEBAR
   ============================================ */
.cart-sidebar {
    position: fixed;
    top: 0;
    right: -450px;
    width: 450px;
    height: 100vh;
    background: var(--pi-bg-white);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    transition: right 0.3s ease;
    display: flex;
    flex-direction: column;
}

.cart-sidebar.open {
    right: 0;
}

.cart-sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--pi-border);
}

.cart-sidebar-header h3 {
    margin: 0;
    font-size: 1.25rem;
}

.cart-close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--pi-text-secondary);
    transition: var(--pi-transition);
}

.cart-close-btn:hover {
    color: var(--pi-text-primary);
}

.cart-sidebar-body {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
}

.cart-empty {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--pi-text-secondary);
}

.cart-empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.cart-item {
    display: flex;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--pi-border);
}

.cart-item-image {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: var(--pi-radius-sm);
}

.cart-item-details {
    flex: 1;
}

.cart-item-title {
    font-size: 0.9375rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.cart-item-duration {
    font-size: 0.8125rem;
    color: var(--pi-text-secondary);
    margin-bottom: 0.5rem;
}

.cart-item-price {
    font-weight: 600;
    color: var(--pi-primary);
}

.cart-item-remove {
    background: none;
    border: none;
    color: var(--pi-text-muted);
    cursor: pointer;
    font-size: 1.25rem;
    transition: var(--pi-transition);
}

.cart-item-remove:hover {
    color: var(--pi-error);
}

.cart-sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--pi-border);
    background: var(--pi-bg-light);
}

.cart-totals {
    margin-bottom: 1rem;
}

.cart-total-row {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    font-size: 0.9375rem;
}

.cart-total-row.total {
    font-size: 1.125rem;
    font-weight: 700;
    border-top: 1px solid var(--pi-border);
    padding-top: 0.75rem;
    margin-top: 0.5rem;
}

.cart-checkout-btn {
    width: 100%;
}

.cart-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: var(--pi-transition);
}

.cart-overlay.visible {
    opacity: 1;
    visibility: visible;
}

/* ============================================
   TEST-SPECIFIC STYLES
   ============================================ */
.test-details-section .details-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.detail-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--pi-bg-white);
    border-radius: var(--pi-radius);
    box-shadow: var(--pi-shadow-sm);
}

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

.detail-content {
    flex: 1;
}

.detail-label {
    display: block;
    font-size: 0.75rem;
    color: var(--pi-text-secondary);
    text-transform: uppercase;
}

.detail-value {
    display: block;
    font-size: 1rem;
    font-weight: 600;
}

.prerequisites-list {
    list-style: none;
    padding: 0;
    margin: 0;
    max-width: 600px;
    margin: 0 auto;
}

.prerequisites-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--pi-bg-light);
    border-radius: var(--pi-radius-sm);
    margin-bottom: 0.5rem;
}

.how-it-works-section .steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    position: relative;
}

.how-it-works-section .steps-grid::before {
    content: '';
    position: absolute;
    top: 2rem;
    left: 10%;
    right: 10%;
    height: 2px;
    background: var(--pi-border);
    z-index: 0;
}

.step-card {
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-number {
    width: 4rem;
    height: 4rem;
    background: var(--pi-primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1rem;
}

.step-card h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.step-card p {
    font-size: 0.875rem;
    color: var(--pi-text-secondary);
    margin: 0;
}

/* ============================================
   COURSE-SPECIFIC STYLES
   ============================================ */
.course-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
    background: var(--pi-bg-white);
    border-radius: var(--pi-radius);
    box-shadow: var(--pi-shadow-sm);
}

.stat-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--pi-primary);
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--pi-text-secondary);
    text-transform: uppercase;
}

.curriculum-list {
    max-width: 800px;
    margin: 0 auto;
}

.curriculum-module {
    background: var(--pi-bg-white);
    border-radius: var(--pi-radius);
    margin-bottom: 0.75rem;
    box-shadow: var(--pi-shadow-sm);
    overflow: hidden;
}

.module-header {
    width: 100%;
    padding: 1rem 1.25rem;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--pi-transition);
}

.module-header:hover {
    background: var(--pi-bg-light);
}

.module-number {
    width: 2rem;
    height: 2rem;
    background: var(--pi-primary-light);
    color: var(--pi-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.module-title {
    flex: 1;
    font-weight: 500;
}

.module-duration {
    font-size: 0.875rem;
    color: var(--pi-text-secondary);
}

.module-expand {
    color: var(--pi-text-muted);
    transition: var(--pi-transition);
}

.curriculum-module.active .module-expand {
    transform: rotate(180deg);
}

.module-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.curriculum-module.active .module-content {
    max-height: 500px;
}

.module-lessons {
    padding: 0 1.25rem 1rem;
    padding-left: 4.5rem;
}

.module-lessons li {
    padding: 0.5rem 0;
    font-size: 0.9375rem;
    color: var(--pi-text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.features-detail-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.feature-card {
    padding: 1.5rem;
    background: var(--pi-bg-white);
    border-radius: var(--pi-radius);
    box-shadow: var(--pi-shadow-sm);
    text-align: center;
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.feature-card h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--pi-text-secondary);
    margin: 0;
}

/* ============================================
   SIMULATOR-SPECIFIC STYLES
   ============================================ */
.simulator-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.coverage-list {
    max-width: 600px;
    margin: 0 auto;
}

.coverage-item {
    margin-bottom: 1rem;
}

.coverage-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.coverage-domain {
    font-weight: 500;
}

.coverage-percent {
    color: var(--pi-primary);
    font-weight: 600;
}

.coverage-bar {
    height: 8px;
    background: var(--pi-bg-light);
    border-radius: 4px;
    overflow: hidden;
}

.coverage-fill {
    height: 100%;
    background: var(--pi-primary);
    border-radius: 4px;
    transition: var(--pi-transition-slow);
}

.modes-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.mode-card {
    padding: 1.5rem;
    background: var(--pi-bg-white);
    border-radius: var(--pi-radius);
    box-shadow: var(--pi-shadow-sm);
    text-align: center;
    transition: var(--pi-transition);
}

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

.mode-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.mode-card h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.mode-card p {
    font-size: 0.875rem;
    color: var(--pi-text-secondary);
    margin: 0;
}

/* ============================================
   CERTIFICATION-SPECIFIC STYLES
   ============================================ */
.cert-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.domains-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.domain-card {
    padding: 1.5rem;
    background: var(--pi-bg-white);
    border-radius: var(--pi-radius);
    box-shadow: var(--pi-shadow-sm);
}

.domain-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.domain-number {
    width: 2rem;
    height: 2rem;
    background: var(--pi-primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.domain-header h4 {
    flex: 1;
    margin: 0;
}

.domain-weight {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--pi-primary);
}

.domain-card p {
    font-size: 0.875rem;
    color: var(--pi-text-secondary);
    margin: 0;
}

.study-path {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.path-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 200px;
}

.path-connector {
    width: 60px;
    height: 2px;
    background: var(--pi-border);
}

.career-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.career-card {
    padding: 1.5rem;
    background: var(--pi-bg-white);
    border-radius: var(--pi-radius);
    box-shadow: var(--pi-shadow-sm);
    text-align: center;
}

.career-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.career-card h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.career-card p {
    font-size: 0.875rem;
    color: var(--pi-text-secondary);
    margin: 0;
}

/* ============================================
   TOOL-SPECIFIC STYLES
   ============================================ */
.tool-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.steps-flow {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    max-width: 1000px;
    margin: 0 auto;
}

.flow-step {
    text-align: center;
    max-width: 180px;
}

.step-circle {
    width: 3rem;
    height: 3rem;
    background: var(--pi-primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 auto 0.75rem;
}

.flow-step h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.flow-step p {
    font-size: 0.8125rem;
    color: var(--pi-text-secondary);
    margin: 0;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.use-case-card {
    padding: 1.5rem;
    background: var(--pi-bg-white);
    border-radius: var(--pi-radius);
    box-shadow: var(--pi-shadow-sm);
    text-align: center;
}

.use-case-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.use-case-card h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.use-case-card p {
    font-size: 0.875rem;
    color: var(--pi-text-secondary);
    margin: 0;
}

/* ============================================
   COMPARISON TABLE
   ============================================ */
.comparison-table {
    max-width: 700px;
    margin: 0 auto;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: var(--pi-bg-white);
    border-radius: var(--pi-radius);
    overflow: hidden;
    box-shadow: var(--pi-shadow);
}

.comparison-table th,
.comparison-table td {
    padding: 1rem 1.25rem;
    text-align: left;
    border-bottom: 1px solid var(--pi-border);
}

.comparison-table th {
    background: var(--pi-primary);
    color: #fff;
    font-weight: 600;
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.comparison-table tr:hover td {
    background: var(--pi-bg-light);
}

/* ============================================
   TESTIMONIALS
   ============================================ */
.testimonials-section,
.success-stories-section {
    padding: 4rem 0;
    background: var(--pi-bg-light);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.testimonial-card {
    padding: 1.5rem;
    background: var(--pi-bg-white);
    border-radius: var(--pi-radius);
    box-shadow: var(--pi-shadow);
}

.testimonial-rating {
    margin-bottom: 0.75rem;
}

.testimonial-text {
    font-size: 0.9375rem;
    color: var(--pi-text-secondary);
    font-style: italic;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.testimonial-author {
    font-weight: 600;
    font-size: 0.875rem;
    margin: 0;
}

/* ============================================
   NOTIFICATIONS
   ============================================ */
.notification {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    background: var(--pi-text-primary);
    color: #fff;
    border-radius: var(--pi-radius);
    box-shadow: var(--pi-shadow-lg);
    z-index: 1001;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--pi-transition);
}

.notification.visible {
    opacity: 1;
    transform: translateY(0);
}

.notification.success {
    background: var(--pi-success);
}

.notification.error {
    background: var(--pi-error);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-card {
        position: static;
        max-width: 400px;
        margin: 2rem auto 0;
    }
    
    .value-props-grid,
    .related-grid,
    .modes-grid,
    .career-grid,
    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .test-details-section .details-grid,
    .course-stats,
    .simulator-stats,
    .cert-stats,
    .tool-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .how-it-works-section .steps-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .how-it-works-section .steps-grid::before {
        display: none;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .features-detail-grid,
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .domains-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .product-title {
        font-size: 1.75rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .value-props-grid,
    .related-grid,
    .modes-grid,
    .career-grid,
    .use-cases-grid,
    .testimonials-grid,
    .features-detail-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .test-details-section .details-grid,
    .course-stats,
    .simulator-stats,
    .cert-stats,
    .tool-stats {
        grid-template-columns: 1fr 1fr;
    }
    
    .how-it-works-section .steps-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .outcomes-grid {
        grid-template-columns: 1fr;
    }
    
    .fbt-container {
        flex-direction: column;
    }
    
    .fbt-plus {
        transform: rotate(90deg);
    }
    
    .cart-sidebar {
        width: 100%;
        right: -100%;
    }
    
    .steps-flow,
    .study-path {
        flex-direction: column;
    }
    
    .flow-arrow,
    .path-connector {
        transform: rotate(90deg);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-section {
        padding: 2rem 0;
    }
    
    .pricing-card {
        padding: 1rem;
    }
    
    .duration-options {
        grid-template-columns: 1fr;
    }
    
    .test-details-section .details-grid,
    .course-stats,
    .simulator-stats,
    .cert-stats,
    .tool-stats {
        grid-template-columns: 1fr;
    }
    
    .comparison-table th,
    .comparison-table td {
        padding: 0.75rem;
        font-size: 0.875rem;
    }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.animate-fade-in {
    animation: fadeInUp 0.5s ease forwards;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 2rem; }

.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}