/* ==========================================================================
   ANIMA RESEARCH - STYLESHEET (Vanilla CSS)
   Aesthetics: Sleek, futuristic, dark glassmorphism with glowing accents
   ========================================================================== */

/* Design System Variables */
:root {
    --bg-dark: #07090e;
    --bg-card: rgba(14, 18, 28, 0.6);
    --bg-header: rgba(7, 9, 14, 0.75);
    --border-glass: rgba(255, 255, 255, 0.06);
    --border-glow: rgba(0, 242, 254, 0.15);
    
    /* Harmonious Color Palette */
    --cyan-glow: #00f2fe;
    --purple-glow: #7f00ff;
    --gold-accent: #d4af37; /* Royal gold */
    --gold-glow: rgba(212, 175, 55, 0.2);
    
    /* Typography Colors */
    --text-primary: #f5f7fa;
    --text-secondary: #a0aec0;
    --text-muted: #718096;
    
    /* Transitions & Shadows */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --glow-shadow: 0 0 20px rgba(0, 242, 254, 0.2);
    --gold-glow-shadow: 0 0 20px rgba(212, 175, 55, 0.15);
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4);
}

/* Base Reset & Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

/* Background Canvas */
#anima-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    background: radial-gradient(circle at 50% 50%, #0e1322 0%, #07090e 100%);
}

/* Background Watermark Logo */
.background-watermark {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 65vw;
    height: 65vw;
    max-width: 800px;
    max-height: 800px;
    background-image: url('assets/logo.png');
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.45; /* High visibility */
    mix-blend-mode: screen; /* Filters out the dark background of the image, keeping only the glowing logo */
    filter: drop-shadow(0 0 50px rgba(0, 242, 254, 0.4)) brightness(1.25); /* Boosts neon glow and brightness */
    pointer-events: none;
    z-index: -1;
}

/* Typography Extensions */
h1, h2, h3, .brand-name {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* Layout Containers */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 24px;
}

/* Header & Navigation */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: var(--bg-header);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-glass);
    transition: var(--transition-smooth);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-img {
    height: 40px;
    width: 40px;
    object-fit: contain;
    filter: drop-shadow(0 0 8px rgba(0, 242, 254, 0.4));
}

.brand-name {
    font-size: 1.4rem;
    background: linear-gradient(135deg, #ffffff 50%, var(--cyan-glow) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
    position: relative;
    padding: 4px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--cyan-glow), var(--gold-accent));
    transition: var(--transition-smooth);
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link:hover::after {
    width: 100%;
}

.cart-toggle-btn {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    color: var(--text-primary);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
}

.cart-toggle-btn:hover {
    background: rgba(0, 242, 254, 0.1);
    border-color: var(--cyan-glow);
    box-shadow: var(--glow-shadow);
    transform: translateY(-2px);
}

.cart-icon {
    width: 20px;
    height: 20px;
}

.cart-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: linear-gradient(135deg, var(--cyan-glow), var(--purple-glow));
    color: #000;
    font-weight: 700;
    font-size: 0.75rem;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    font-family: 'Outfit', sans-serif;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-smooth);
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--cyan-glow) 0%, var(--purple-glow) 100%);
    color: #000000;
    border: none;
    box-shadow: var(--glow-shadow);
    font-weight: 700;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 242, 254, 0.4);
    filter: brightness(1.1);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
    border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--text-primary);
    transform: translateY(-2px);
}

.btn-block {
    width: 100%;
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px 24px;
    text-align: center;
    position: relative;
}

.hero-container {
    max-width: 800px;
    z-index: 10;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 24px;
    line-height: 1.1;
    background: linear-gradient(135deg, #ffffff 40%, #a0aec0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.gradient-text {
    background: linear-gradient(135deg, var(--cyan-glow) 30%, var(--purple-glow) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 15px rgba(0, 242, 254, 0.3));
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 40px;
    font-weight: 300;
}

.hero-actions-container {
    display: flex;
    justify-content: center;
    gap: 20px;
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 16px;
    background: linear-gradient(180deg, #ffffff 0%, #cbd5e0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    font-weight: 300;
}

/* Science Section */
.science-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.science-card {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    padding: 40px 32px;
    border-radius: 16px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.science-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(0, 242, 254, 0.05), transparent 60%);
    pointer-events: none;
}

.science-card:hover {
    transform: translateY(-5px);
    border-color: var(--cyan-glow);
    box-shadow: var(--glow-shadow);
}

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: rgba(0, 242, 254, 0.05);
    border: 1px solid rgba(0, 242, 254, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cyan-glow);
    margin-bottom: 24px;
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.1);
}

.card-icon svg {
    width: 28px;
    height: 28px;
}

.science-card h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.science-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
    font-weight: 300;
}

/* Catalog Controls */
.catalog-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    gap: 24px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-glass);
    padding: 16px 24px;
    border-radius: 12px;
    backdrop-filter: blur(8px);
}

.search-box input {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    padding: 12px 20px;
    border-radius: 8px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    width: 300px;
    transition: var(--transition-smooth);
}

.search-box input:focus {
    outline: none;
    border-color: var(--cyan-glow);
    box-shadow: var(--glow-shadow);
    background: rgba(255, 255, 255, 0.06);
}

.filter-buttons {
    display: flex;
    gap: 12px;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition-smooth);
}

.filter-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--cyan-glow) 0%, rgba(127, 0, 255, 0.3) 100%);
    border-color: var(--cyan-glow);
    color: #ffffff;
    font-weight: 600;
    box-shadow: var(--glow-shadow);
}

/* Product Grid & Cards */
.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.product-card {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: 16px;
    overflow: hidden;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: var(--card-shadow);
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-5px);
    border-color: var(--gold-accent);
    box-shadow: var(--gold-glow-shadow);
}

.product-visual {
    height: 180px;
    background: linear-gradient(135deg, #101524 0%, #07090e 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    border-bottom: 1px solid var(--border-glass);
}

/* Glowing Magic Runes Background for Product Visuals */
.product-visual::after {
    content: '';
    position: absolute;
    width: 110px;
    height: 110px;
    border-radius: 50%;
    border: 1px dashed rgba(214, 175, 55, 0.15);
    animation: rotateRune 20s linear infinite;
    pointer-events: none;
}

@keyframes rotateRune {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.visual-icon {
    width: 32px;
    height: 32px;
    filter: drop-shadow(0 0 12px var(--glow-color));
    position: absolute;
    bottom: 12px;
    right: 12px;
    z-index: 2;
    opacity: 0.85;
    transition: var(--transition-smooth);
}

.product-card:hover .visual-icon {
    opacity: 1;
    transform: scale(1.1);
}

.product-vial-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    top: 0;
    left: 0;
    transition: var(--transition-smooth);
    filter: brightness(0.92);
    z-index: 1;
}

.product-card:hover .product-vial-image {
    transform: scale(1.04);
    filter: brightness(1.08);
}

.product-content {
    padding: 24px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.product-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.product-name {
    font-size: 1.35rem;
    font-weight: 600;
}

.product-category {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 4px 8px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    border-radius: 4px;
    color: var(--text-secondary);
}

.product-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 20px;
    font-weight: 300;
    flex-grow: 1;
}

.product-policy-notice {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.product-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

.product-price {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: 'Outfit', sans-serif;
    color: var(--text-primary);
}

/* Cart Drawer */
.cart-drawer {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100%;
    background: #090c14;
    border-left: 1px solid var(--border-glass);
    z-index: 1000;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.6);
    display: flex;
    flex-direction: column;
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.cart-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-glass);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cart-header h3 {
    font-size: 1.5rem;
}

.cart-close-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    width: 24px;
    height: 24px;
    transition: var(--transition-smooth);
}

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

.cart-body {
    flex-grow: 1;
    padding: 24px;
    overflow-y: auto;
}

.empty-cart-msg {
    color: var(--text-muted);
    text-align: center;
    margin-top: 40px;
    font-size: 0.95rem;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.cart-item-info h4 {
    font-size: 1rem;
    margin-bottom: 4px;
}

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

.cart-item-remove {
    background: transparent;
    border: none;
    color: #e53e3e;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition-smooth);
}

.cart-item-remove:hover {
    text-decoration: underline;
}

.cart-footer {
    padding: 24px;
    border-top: 1px solid var(--border-glass);
    background: rgba(255, 255, 255, 0.01);
}

.cart-total {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    font-size: 1.25rem;
    font-weight: 700;
}

.cart-total #cart-total-price {
    color: var(--cyan-glow);
    text-shadow: 0 0 8px rgba(0, 242, 254, 0.3);
}

.cart-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 999;
    display: none;
}

.cart-overlay.open {
    display: block;
}

/* Toast Notifications */
.toast-notification {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: linear-gradient(135deg, #101524 0%, #0e121e 100%);
    border: 1px solid var(--cyan-glow);
    padding: 16px 32px;
    border-radius: 8px;
    z-index: 1100;
    box-shadow: var(--glow-shadow);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    pointer-events: none;
    font-weight: 500;
    color: #ffffff;
}

.toast-notification.show {
    transform: translateX(-50%) translateY(0);
}

/* Footer styling */
.site-footer {
    border-top: 1px solid var(--border-glass);
    background: #04060a;
    padding: 80px 24px 40px 24px;
    position: relative;
    z-index: 10;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    font-size: 1.5rem;
    font-weight: 700;
}

.footer-logo {
    height: 36px;
    width: 36px;
}

.footer-disclaimer {
    color: var(--text-muted);
    font-size: 0.8rem;
    line-height: 1.6;
    margin-bottom: 40px;
    max-width: 800px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 24px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-signature code {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 4px 12px;
    border-radius: 4px;
    color: var(--text-secondary);
}

/* FAQ Accordion Styling */
.faq-section {
    padding-top: 20px;
    padding-bottom: 80px;
}

.faq-accordion-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: 12px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    overflow: hidden;
    transition: var(--transition-smooth);
}

.faq-item:hover {
    border-color: var(--cyan-glow);
    box-shadow: var(--glow-shadow);
}

.faq-trigger {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 28px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 600;
    font-size: 1.1rem;
    text-align: left;
    font-family: inherit;
    transition: var(--transition-smooth);
}

.faq-trigger:hover {
    color: var(--cyan-glow);
}

.faq-icon-arrow {
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--text-secondary);
    border-bottom: 2px solid var(--text-secondary);
    transform: rotate(45deg);
    transition: var(--transition-smooth);
    margin-right: 8px;
}

.faq-item.active .faq-icon-arrow {
    transform: rotate(-135deg);
    border-color: var(--cyan-glow);
}

.faq-content {
    max-height: 0;
    overflow: hidden;
    padding: 0 28px;
    opacity: 0;
    transition: var(--transition-smooth);
}

.faq-item.active .faq-content {
    max-height: 250px;
    padding: 0 28px 24px 28px;
    opacity: 1;
}

.faq-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    font-weight: 300;
}

/* Disclaimer Gatekeeper Modal */
.disclaimer-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(4, 5, 8, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 9999; /* Highest priority */
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 40px 20px;
    overflow-y: auto;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.disclaimer-modal.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.disclaimer-modal-content {
    background: linear-gradient(135deg, #0d111c 0%, #07090e 100%);
    border: 1px solid var(--gold-accent);
    border-radius: 16px;
    width: 100%;
    max-width: 600px;
    padding: 40px;
    box-shadow: var(--gold-glow-shadow);
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.disclaimer-header {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.disclaimer-logo {
    height: 60px;
    width: 60px;
    filter: drop-shadow(0 0 10px rgba(214, 175, 55, 0.35));
}

.disclaimer-header h2 {
    font-size: 1.8rem;
    color: #ffffff;
    background: linear-gradient(135deg, #ffffff 40%, var(--gold-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.disclaimer-body p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 16px;
}

.disclaimer-terms {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 20px;
    max-height: 200px;
    overflow-y: auto;
}

.disclaimer-terms ul {
    list-style-type: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.disclaimer-terms li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    position: relative;
    padding-left: 16px;
}

.disclaimer-terms li::before {
    content: '▪';
    position: absolute;
    left: 0;
    color: var(--gold-accent);
}

.disclaimer-agreement {
    margin-top: 16px;
}

.agreement-label {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    cursor: pointer;
    font-size: 0.88rem;
    color: var(--text-primary);
    line-height: 1.5;
}

.agreement-label input {
    margin-top: 4px;
    accent-color: var(--gold-accent);
}

.btn-primary:disabled {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-glass);
    color: var(--text-muted);
    cursor: not-allowed;
    box-shadow: none;
}
.btn-primary:disabled:hover {
    transform: none;
    filter: none;
}

/* Compliance Notice and Checkout Disclaimer */
.compliance-banner {
    background: rgba(214, 175, 55, 0.08);
    border-bottom: 1px solid rgba(214, 175, 55, 0.25);
    padding: 8px 16px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--gold-accent);
    text-align: center;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.cart-checkout-disclaimer {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.4;
    margin-bottom: 16px;
    padding: 8px 12px;
    background: rgba(229, 62, 62, 0.05);
    border-left: 2px solid #e53e3e;
    border-radius: 4px;
}

.checkout-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(4, 5, 8, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 9999;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 40px 20px;
    overflow-y: auto;
    transition: opacity 0.4s ease, visibility 0.4s ease;
}

.checkout-modal.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.checkout-modal-content {
    background: linear-gradient(135deg, #0d111c 0%, #07090e 100%);
    border: 1px solid var(--border-glass);
    border-radius: 16px;
    width: 100%;
    max-width: 600px;
    padding: 32px;
    box-shadow: var(--glow-shadow);
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.checkout-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-glass);
    padding-bottom: 16px;
}

.checkout-header h2 {
    font-size: 1.6rem;
    color: #ffffff;
    background: linear-gradient(135deg, #ffffff 40%, var(--cyan-glow) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.checkout-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    transition: var(--transition-smooth);
}

.checkout-close:hover {
    color: var(--cyan-glow);
}

.checkout-summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 242, 254, 0.05);
    border: 1px solid rgba(0, 242, 254, 0.15);
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 1.1rem;
    margin-bottom: 16px;
}

.checkout-summary strong {
    color: var(--cyan-glow);
    font-family: 'Outfit', sans-serif;
    font-size: 1.3rem;
}

.checkout-shipping-info {
    border-bottom: 1px solid var(--border-glass);
    padding-bottom: 20px;
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.checkout-shipping-info h3 {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 4px;
}

.form-grid-3 {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 12px;
}

.payment-method-selector h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    font-weight: 500;
}

.payment-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.payment-option {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 12px 8px;
    text-align: center;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition-smooth);
    color: var(--text-secondary);
}

.payment-option input {
    display: none;
}

.payment-option:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--text-secondary);
}

.payment-option.active {
    background: rgba(0, 242, 254, 0.08);
    border-color: var(--cyan-glow);
    color: var(--cyan-glow);
    box-shadow: 0 0 12px rgba(0, 242, 254, 0.15);
}

.payment-form-container {
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 20px;
    min-height: 160px;
}

.payment-form-section.hidden {
    display: none !important;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 12px;
}

.form-group label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-control {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    padding: 10px 14px;
    border-radius: 6px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
}

.form-control:focus {
    outline: none;
    border-color: var(--cyan-glow);
    box-shadow: var(--glow-shadow);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.apple-pay-btn-placeholder, .paypal-btn-placeholder {
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition-smooth);
}

.apple-pay-btn-placeholder {
    background: #000000;
    color: #ffffff;
    border: 1px solid rgba(255,255,255,0.1);
    font-size: 1.1rem;
}

.apple-pay-btn-placeholder:hover {
    background: #111111;
}

.paypal-btn-placeholder {
    background: #ffc439;
    color: #003087;
    font-size: 1.1rem;
}

.paypal-btn-placeholder:hover {
    background: #ebb12b;
}

.payment-instructions {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 16px;
}

.checkout-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    border-top: 1px solid var(--border-glass);
    padding-top: 16px;
}

.checkout-agreement {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-glass);
}

.checkout-agreement-label {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-primary);
    line-height: 1.5;
}

.checkout-agreement-label input {
    margin-top: 4px;
    accent-color: var(--cyan-glow);
}

.payment-qr-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
    text-align: center;
}

.payment-qr-image {
    width: 150px;
    height: 150px;
    border-radius: 12px;
    border: 2px solid rgba(255, 255, 255, 0.08);
    background: #07090e;
    padding: 8px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.5);
    transition: var(--transition-smooth);
}

.payment-qr-image:hover {
    border-color: var(--cyan-glow);
    box-shadow: var(--glow-shadow);
    transform: scale(1.03);
}

/* Responsive Scaling */
@media (max-width: 992px) {
    .science-grid, .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .catalog-controls {
        flex-direction: column;
        align-items: stretch;
    }
    .search-box input {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.8rem;
    }
    .science-grid, .product-grid {
        grid-template-columns: 1fr;
    }
    .nav-menu {
        display: none; /* Mobile menu shortcut */
    }
    .cart-drawer {
        width: 100%;
        right: -100%;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    .calculator-container {
        grid-template-columns: 1fr !important;
        padding: 20px !important;
    }
    .calc-outputs {
        border-left: none !important;
        padding-left: 0 !important;
        border-top: 1px solid var(--border-glass);
        padding-top: 24px;
    }
}

body.modal-open {
    overflow: hidden !important;
}

/* Research Assistant Chatbot CSS */
.chat-bot-toggle {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--cyan-glow) 0%, var(--purple-glow) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #000000;
    cursor: pointer;
    box-shadow: 0 0 20px rgba(0, 242, 254, 0.4);
    z-index: 999;
    transition: var(--transition-smooth);
}

.chat-bot-toggle:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 0 30px rgba(0, 242, 254, 0.6);
}

.chat-bot-toggle svg {
    width: 26px;
    height: 26px;
}

.chat-bot-badge {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 12px;
    height: 12px;
    background: #48bb78;
    border-radius: 50%;
    border: 2px solid var(--bg-dark);
    box-shadow: 0 0 8px #48bb78;
}

.chat-bot-container {
    position: fixed;
    bottom: 105px;
    right: 30px;
    width: 380px;
    height: 500px;
    background: rgba(10, 14, 24, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: 16px;
    box-shadow: var(--glow-shadow);
    z-index: 999;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: opacity 0.4s ease, transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-origin: bottom right;
}

.chat-bot-container.hidden {
    opacity: 0;
    transform: scale(0.8) translateY(50px);
    pointer-events: none;
}

.chat-bot-header {
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border-glass);
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-bot-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
    transition: var(--transition-smooth);
}

.chat-bot-close:hover {
    color: #e53e3e;
}

.chat-bot-messages {
    flex-grow: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.chat-msg {
    max-width: 80%;
    padding: 10px 14px;
    border-radius: 12px;
    font-size: 0.88rem;
    line-height: 1.4;
    word-break: break-word;
}

.chat-msg.bot {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    align-self: flex-start;
    border-bottom-left-radius: 2px;
}

.chat-msg.user {
    background: rgba(0, 242, 254, 0.1);
    border: 1px solid rgba(0, 242, 254, 0.2);
    color: #ffffff;
    align-self: flex-end;
    border-bottom-right-radius: 2px;
}

.chat-msg.compliance-warning {
    background: rgba(229, 62, 62, 0.08);
    border: 1px solid rgba(229, 62, 62, 0.3);
    color: #fc8181;
    max-width: 95%;
    align-self: center;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 500;
}

.chat-bot-chips {
    display: flex;
    gap: 8px;
    padding: 0 20px 12px 20px;
    overflow-x: auto;
    flex-shrink: 0;
}

.chat-bot-chips::-webkit-scrollbar {
    height: 4px;
}

.chat-bot-chips::-webkit-scrollbar-thumb {
    background: var(--border-glass);
    border-radius: 2px;
}

.chat-chip {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition-smooth);
}

.chat-chip:hover {
    background: rgba(0, 242, 254, 0.06);
    border-color: var(--cyan-glow);
    color: #ffffff;
}

.chat-bot-input-area {
    padding: 12px 20px;
    border-top: 1px solid var(--border-glass);
    display: flex;
    gap: 8px;
    background: rgba(255, 255, 255, 0.01);
}

.chat-bot-input-area input {
    flex-grow: 1;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    padding: 10px 16px;
    border-radius: 20px;
    color: var(--text-primary);
    font-size: 0.88rem;
    outline: none;
    transition: var(--transition-smooth);
}

.chat-bot-input-area input:focus {
    border-color: var(--cyan-glow);
    background: rgba(255, 255, 255, 0.06);
}

.chat-bot-input-area button {
    background: var(--cyan-glow);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #000000;
    cursor: pointer;
    flex-shrink: 0;
    transition: var(--transition-smooth);
}

.chat-bot-input-area button:hover {
    background: #00d2da;
    transform: scale(1.05);
}

.chat-bot-input-area button svg {
    width: 16px;
    height: 16px;
    transform: translate(-1px, 0px);
}


@media (max-width: 480px) {
    .chat-bot-container {
        width: calc(100% - 40px);
        bottom: 95px;
        right: 20px;
        left: 20px;
        height: 450px;
    }
    .chat-bot-toggle {
        bottom: 20px;
        right: 20px;
    }
}