/** * Copyright (c) 2026 DNA Genics, S.L. All rights reserved.
 * 
 * Blood Type Ancestry Report - Cinematic Narrative Design
 * A calm, human-centered design that positions blood type as shared inheritance.
 */

/* ========================================
   CSS Custom Properties
   ======================================== */
:root {
    /* Primary Colors - Warm Earth Tones */
    --bt-primary: #5D4E37;
    --bt-primary-dark: #4A3D2C;
    --bt-primary-light: #7A6B54;
    
    /* Secondary - Soft Sage */
    --bt-secondary: #7A8B7A;
    --bt-secondary-dark: #5F6F5F;
    --bt-secondary-light: #9AAA9A;
    
    /* Accent - Warm Amber */
    --bt-accent: #C9A962;
    --bt-accent-light: #E5D4A0;
    --bt-accent-dark: #A68942;
    
    /* Neutral Colors */
    --bt-dark: #2D2D2D;
    --bt-dark-soft: #3D3D3D;
    --bt-text: #333333;
    --bt-text-muted: #6B6B6B;
    --bt-text-light: #8A8A8A;
    
    /* Background Colors */
    --bt-bg-cream: #FDFBF7;
    --bt-bg-light: #F8F6F2;
    --bt-bg-warm: #F5F0E8;
    --bt-white: #FFFFFF;
    --bt-border: rgba(93, 78, 55, 0.12);
    
    /* Blood Type Colors (muted, not clinical) */
    --bt-type-o: #8B7355;
    --bt-type-a: #6B8B6B;
    --bt-type-b: #7B6B8B;
    --bt-type-ab: #8B7B6B;
    
    /* Typography */
    --bt-font-serif: 'Cormorant Garamond', 'Georgia', serif;
    --bt-font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Shadows - Soft and warm */
    --bt-shadow-xs: 0 1px 3px rgba(45, 45, 45, 0.04);
    --bt-shadow-sm: 0 2px 8px rgba(45, 45, 45, 0.06);
    --bt-shadow-md: 0 8px 24px rgba(45, 45, 45, 0.08);
    --bt-shadow-lg: 0 16px 48px rgba(45, 45, 45, 0.10);
    --bt-shadow-xl: 0 24px 64px rgba(45, 45, 45, 0.12);
    --bt-shadow-warm: 0 8px 32px rgba(201, 169, 98, 0.15);
    
    /* Border Radius */
    --bt-radius-sm: 8px;
    --bt-radius-md: 12px;
    --bt-radius-lg: 20px;
    --bt-radius-xl: 28px;
    --bt-radius-full: 9999px;
    
    /* Transitions */
    --bt-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --bt-transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    --bt-transition-fast: all 0.15s ease;
}

/* ========================================
   Base & Typography
   ======================================== */
.bt-main {
    font-family: var(--bt-font-sans);
    color: var(--bt-text);
    background: var(--bt-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.bt-main h1,
.bt-main h2,
.bt-main h3,
.bt-main h4 {
    font-family: var(--bt-font-serif);
    font-weight: 600;
    color: var(--bt-dark);
    line-height: 1.2;
}

.bt-main p {
    line-height: 1.7;
    color: var(--bt-text);
}

/* ========================================
   Accessibility
   ======================================== */
.bt-skip-link {
    position: absolute;
    left: -999px;
    top: 10px;
    z-index: 2000;
    background: var(--bt-white);
    color: var(--bt-dark);
    padding: 12px 20px;
    border-radius: var(--bt-radius-sm);
    box-shadow: var(--bt-shadow-lg);
    text-decoration: none;
    font-weight: 600;
    font-family: var(--bt-font-sans);
}

.bt-skip-link:focus {
    left: 10px;
    outline: 3px solid var(--bt-accent);
    outline-offset: 2px;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .bt-scroll-progress,
    .bt-scroll-indicator {
        display: none;
    }
}

/* ========================================
   Scroll Progress Bar
   ======================================== */
.bt-scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--bt-primary) 0%, var(--bt-accent) 100%);
    width: 0%;
    z-index: 9999;
    transition: width 0.1s ease-out;
}

/* ========================================
   Page Navigation Dots
   ======================================== */
.bt-page-nav {
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1200;
    display: flex;
    flex-direction: column;
    gap: 12px;
    opacity: 0;
    visibility: hidden;
    transition: var(--bt-transition);
}

.bt-page-nav.visible {
    opacity: 1;
    visibility: visible;
}

.bt-nav-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(93, 78, 55, 0.2);
    border: 2px solid rgba(93, 78, 55, 0.4);
    position: relative;
    transition: var(--bt-transition);
    cursor: pointer;
}

.bt-nav-dot:hover,
.bt-nav-dot:focus {
    transform: scale(1.2);
    background: rgba(93, 78, 55, 0.4);
    outline: none;
}

.bt-nav-dot.active {
    background: var(--bt-primary);
    border-color: var(--bt-primary);
    transform: scale(1.2);
}

.bt-nav-dot::after {
    content: attr(data-tooltip);
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    white-space: nowrap;
    background: var(--bt-dark);
    color: var(--bt-white);
    padding: 8px 14px;
    border-radius: var(--bt-radius-sm);
    font-size: 0.8rem;
    font-family: var(--bt-font-sans);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.bt-nav-dot:hover::after,
.bt-nav-dot:focus::after {
    opacity: 1;
}

@media (max-width: 991px) {
    .bt-page-nav {
        display: none;
    }
}

/* ========================================
   Back to Top Button
   ======================================== */
.bt-back-to-top {
    position: fixed;
    bottom: 30px;
    right: 24px;
    width: 48px;
    height: 48px;
    background: var(--bt-primary);
    color: var(--bt-white);
    border: none;
    border-radius: 50%;
    font-size: 1rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--bt-transition);
    box-shadow: var(--bt-shadow-md);
    z-index: 1100;
}

.bt-back-to-top:hover {
    background: var(--bt-primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--bt-shadow-lg);
}

.bt-back-to-top:focus {
    outline: 3px solid var(--bt-accent);
    outline-offset: 2px;
}

.bt-back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

/* ========================================
   Hero Section
   ======================================== */
.bt-hero {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.bt-hero-bg {
    position: absolute;
    inset: 0;
    background: url('/img/reports/traits/bloodtype/bloodtype-hero.webp') center/cover no-repeat;
}

.bt-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(45, 45, 45, 0.75) 0%,
        rgba(93, 78, 55, 0.65) 50%,
        rgba(45, 45, 45, 0.75) 100%
    );
}

.bt-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 120px 20px 60px;
    max-width: 800px;
    margin: 0 auto;
}

.bt-hero-badge {
    display: inline-flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    color: var(--bt-white);
    padding: 10px 24px;
    border-radius: var(--bt-radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.bt-hero-title {
    color: var(--bt-white) !important;
    margin-bottom: 1.5rem;
}

.bt-title-line {
    display: block;
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 400;
    opacity: 0.95;
}

.bt-title-accent {
    display: block;
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 700;
    color: var(--bt-accent-light) !important;
    margin-top: 0.25rem;
}

.bt-hero-lead {
    font-size: clamp(1.1rem, 2.5vw, 1.35rem);
    color: rgba(255, 255, 255, 0.9) !important;
    line-height: 1.7;
    max-width: 600px;
    margin: 0 auto 2.5rem;
    font-weight: 400;
}

/* Hero Stats */
.bt-hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.bt-stat-item {
    text-align: center;
}

.bt-stat-value {
    display: block;
    font-family: var(--bt-font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--bt-white);
    line-height: 1.1;
}

.bt-stat-label {
    display: block;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.75);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 0.25rem;
}

.bt-stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.3);
}

/* Hero CTA */
.bt-hero-cta {
    margin-bottom: 3rem;
}

.bt-cta-primary {
    display: inline-flex;
    align-items: center;
    background: var(--bt-white);
    color: var(--bt-primary);
    padding: 16px 36px;
    border-radius: var(--bt-radius-full);
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--bt-transition);
    box-shadow: var(--bt-shadow-lg);
}

.bt-cta-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--bt-shadow-xl);
    color: var(--bt-primary);
    text-decoration: none;
}

.bt-cta-primary:focus {
    outline: 3px solid var(--bt-accent);
    outline-offset: 3px;
}

/* Scroll Indicator */
.bt-scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.bt-scroll-indicator i {
    margin-top: 8px;
    animation: bt-bounce 2s ease-in-out infinite;
}

@keyframes bt-bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(8px); }
    60% { transform: translateY(4px); }
}

/* ========================================
   Section Styles
   ======================================== */
.bt-section {
    padding: 100px 0;
    position: relative;
}

.bt-section-light {
    background: var(--bt-bg-light);
}

.bt-section-cream {
    background: var(--bt-bg-cream);
}

.bt-section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem;
}

.bt-section-label {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--bt-primary);
    margin-bottom: 1rem;
}

.bt-section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1rem;
    color: var(--bt-dark);
}

.bt-section-subtitle {
    font-size: 1.15rem;
    color: var(--bt-text-muted);
    line-height: 1.7;
}

/* ========================================
   Cards
   ======================================== */
.bt-cards-row {
    margin-top: 2rem;
}

.bt-card {
    background: var(--bt-white);
    border-radius: var(--bt-radius-lg);
    padding: 2.5rem;
    height: 100%;
    box-shadow: var(--bt-shadow-sm);
    border: 1px solid var(--bt-border);
    transition: var(--bt-transition);
    text-align: center;
}

.bt-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--bt-shadow-md);
}

.bt-card-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--bt-bg-warm) 0%, var(--bt-bg-cream) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 1.75rem;
    color: var(--bt-primary);
    transition: var(--bt-transition);
}

.bt-card:hover .bt-card-icon {
    background: linear-gradient(135deg, var(--bt-primary) 0%, var(--bt-primary-light) 100%);
    color: var(--bt-white);
}

.bt-card h3 {
    font-size: 1.35rem;
    margin-bottom: 1rem;
    color: var(--bt-dark);
}

.bt-card p {
    color: var(--bt-text-muted);
    font-size: 1rem;
    margin-bottom: 0;
}

/* ========================================
   Narrative Section
   ======================================== */
.bt-section-narrative {
    background: linear-gradient(180deg, var(--bt-bg-cream) 0%, var(--bt-bg-warm) 100%);
    padding: 120px 0;
}

.bt-narrative-block {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.bt-narrative-content {
    margin-bottom: 3rem;
}

.bt-narrative-lead {
    font-family: var(--bt-font-serif);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 500;
    color: var(--bt-primary);
    font-style: italic;
    margin-bottom: 2rem;
}

.bt-narrative-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    text-align: left;
}

/* Quote Styles */
.bt-quote {
    background: var(--bt-white);
    border-left: 4px solid var(--bt-accent);
    padding: 2rem 2.5rem;
    margin: 3rem 0;
    border-radius: 0 var(--bt-radius-md) var(--bt-radius-md) 0;
    box-shadow: var(--bt-shadow-sm);
}

.bt-quote p {
    font-family: var(--bt-font-serif);
    font-size: 1.25rem;
    font-style: italic;
    color: var(--bt-dark);
    margin: 0;
    line-height: 1.6;
}

.bt-quote-centered {
    text-align: center;
    border-left: none;
    border-top: 4px solid var(--bt-accent);
    border-radius: var(--bt-radius-md);
}

/* History Visual */
.bt-history-visual {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    margin-top: 3rem;
}

.bt-history-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    background: var(--bt-white);
    padding: 1.5rem 2rem;
    border-radius: var(--bt-radius-md);
    box-shadow: var(--bt-shadow-sm);
    width: 100%;
    max-width: 500px;
}

.bt-history-marker {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--bt-primary);
    color: var(--bt-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--bt-font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.bt-history-text {
    text-align: left;
}

.bt-history-text strong {
    display: block;
    font-size: 1.1rem;
    color: var(--bt-dark);
    margin-bottom: 0.25rem;
}

.bt-history-text span {
    font-size: 0.9rem;
    color: var(--bt-text-muted);
}

.bt-history-connector {
    width: 2px;
    height: 30px;
    background: linear-gradient(to bottom, var(--bt-primary), var(--bt-accent));
}

/* ========================================
   Reveals Section
   ======================================== */
.bt-reveals-row {
    margin-top: 2rem;
}

.bt-reveal-card {
    background: var(--bt-white);
    border-radius: var(--bt-radius-lg);
    padding: 2rem;
    height: 100%;
    text-align: center;
    box-shadow: var(--bt-shadow-sm);
    border: 1px solid var(--bt-border);
    transition: var(--bt-transition);
}

.bt-reveal-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--bt-shadow-md);
    border-color: var(--bt-accent);
}

.bt-reveal-icon {
    width: 60px;
    height: 60px;
    background: var(--bt-bg-warm);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem;
    font-size: 1.5rem;
    color: var(--bt-primary);
    transition: var(--bt-transition);
}

.bt-reveal-card:hover .bt-reveal-icon {
    background: var(--bt-primary);
    color: var(--bt-white);
}

.bt-reveal-card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
    color: var(--bt-dark);
}

.bt-reveal-card p {
    font-size: 0.95rem;
    color: var(--bt-text-muted);
    margin: 0;
}

/* ========================================
   Unity Section
   ======================================== */
.bt-section-unity {
    background: linear-gradient(180deg, var(--bt-primary) 0%, var(--bt-primary-dark) 100%);
    color: var(--bt-white);
    padding: 120px 0;
}

.bt-unity-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.bt-section-unity .bt-section-label {
    color: var(--bt-accent-light);
}

.bt-section-unity .bt-section-title {
    color: var(--bt-white);
}

.bt-unity-message {
    margin-bottom: 3rem;
}

.bt-unity-lead {
    font-family: var(--bt-font-serif);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--bt-accent-light);
    margin-bottom: 1.5rem;
}

.bt-unity-message p {
    color: rgba(255, 255, 255, 0.85);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.25rem;
}

/* Unity Visual - Overlapping Circles */
.bt-unity-visual {
    position: relative;
    height: 200px;
    margin: 3rem auto;
    max-width: 400px;
}

.bt-unity-circle {
    position: absolute;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--bt-font-serif);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--bt-white);
    opacity: 0.85;
    transition: var(--bt-transition);
}

.bt-unity-circle:hover {
    transform: scale(1.1);
    opacity: 1;
    z-index: 10;
}

.bt-circle-o {
    background: var(--bt-type-o);
    top: 20%;
    left: 15%;
}

.bt-circle-a {
    background: var(--bt-type-a);
    top: 20%;
    right: 15%;
}

.bt-circle-b {
    background: var(--bt-type-b);
    bottom: 10%;
    left: 25%;
}

.bt-circle-ab {
    background: var(--bt-type-ab);
    bottom: 10%;
    right: 25%;
}

.bt-unity-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: var(--bt-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--bt-white);
    z-index: 5;
    box-shadow: 0 0 30px rgba(201, 169, 98, 0.5);
}

.bt-section-unity .bt-quote {
    background: rgba(255, 255, 255, 0.1);
    border-left-color: var(--bt-accent);
    backdrop-filter: blur(10px);
}

.bt-section-unity .bt-quote p {
    color: var(--bt-white);
}

.bt-section-unity .bt-quote-centered {
    border-top-color: var(--bt-accent);
}

/* ========================================
   Guidance Section
   ======================================== */
.bt-guidance-grid {
    max-width: 800px;
    margin: 0 auto;
}

.bt-guidance-item {
    display: flex;
    gap: 1.5rem;
    background: var(--bt-white);
    padding: 2rem;
    border-radius: var(--bt-radius-lg);
    margin-bottom: 1.5rem;
    box-shadow: var(--bt-shadow-sm);
    border: 1px solid var(--bt-border);
    transition: var(--bt-transition);
}

.bt-guidance-item:hover {
    box-shadow: var(--bt-shadow-md);
}

.bt-guidance-number {
    width: 50px;
    height: 50px;
    background: var(--bt-primary);
    color: var(--bt-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--bt-font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.bt-guidance-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--bt-dark);
}

.bt-guidance-content p {
    color: var(--bt-text-muted);
    margin: 0;
}

.bt-guidance-note {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background: var(--bt-bg-warm);
    padding: 1.5rem 2rem;
    border-radius: var(--bt-radius-md);
    margin-top: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.bt-guidance-note i {
    color: var(--bt-primary);
    font-size: 1.25rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.bt-guidance-note p {
    color: var(--bt-text);
    margin: 0;
    font-size: 0.95rem;
}

/* ========================================
   Experience Section
   ======================================== */
.bt-section-experience {
    background: var(--bt-bg-cream);
}

.bt-report-preview {
    background: var(--bt-white);
    border-radius: var(--bt-radius-xl);
    padding: 2rem;
    box-shadow: var(--bt-shadow-lg);
    border: 1px solid var(--bt-border);
}

.bt-preview-header {
    text-align: center;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--bt-border);
    margin-bottom: 1.5rem;
}

.bt-preview-badge {
    display: inline-block;
    background: var(--bt-primary);
    color: var(--bt-white);
    padding: 6px 16px;
    border-radius: var(--bt-radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.75rem;
}

.bt-preview-header h4 {
    font-size: 1.25rem;
    color: var(--bt-dark);
    margin: 0;
}

.bt-preview-type {
    text-align: center;
    padding: 2rem 0;
}

.bt-type-display {
    display: block;
    font-family: var(--bt-font-serif);
    font-size: 5rem;
    font-weight: 700;
    color: var(--bt-primary);
    line-height: 1;
}

.bt-type-label {
    display: block;
    font-size: 0.9rem;
    color: var(--bt-text-muted);
    margin-top: 0.5rem;
}

.bt-preview-features {
    padding-top: 1.5rem;
    border-top: 1px solid var(--bt-border);
}

.bt-preview-feature {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--bt-border);
}

.bt-preview-feature:last-child {
    border-bottom: none;
}

.bt-preview-feature i {
    color: var(--bt-secondary);
    font-size: 1rem;
}

.bt-preview-feature span {
    font-size: 0.95rem;
    color: var(--bt-text);
}

/* Experience Features */
.bt-experience-features {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.bt-exp-feature {
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
}

.bt-exp-icon {
    width: 50px;
    height: 50px;
    background: var(--bt-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--bt-primary);
    flex-shrink: 0;
    box-shadow: var(--bt-shadow-sm);
}

.bt-exp-text h4 {
    font-size: 1.1rem;
    margin-bottom: 0.35rem;
    color: var(--bt-dark);
}

.bt-exp-text p {
    font-size: 0.95rem;
    color: var(--bt-text-muted);
    margin: 0;
}

/* ========================================
   Science Section
   ======================================== */
.bt-section-science {
    background: var(--bt-bg-light);
}

.bt-science-content {
    max-width: 1000px;
    margin: 0 auto;
}

.bt-science-card {
    background: var(--bt-white);
    border-radius: var(--bt-radius-lg);
    padding: 2rem;
    height: 100%;
    box-shadow: var(--bt-shadow-sm);
    border: 1px solid var(--bt-border);
}

.bt-science-card h3 {
    font-size: 1.25rem;
    color: var(--bt-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
}

.bt-science-card p {
    color: var(--bt-text);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.bt-science-card p:last-child {
    margin-bottom: 0;
}

.bt-science-inheritance {
    background: var(--bt-white);
    border-radius: var(--bt-radius-lg);
    padding: 2rem;
    margin-top: 1.5rem;
    box-shadow: var(--bt-shadow-sm);
    border: 1px solid var(--bt-border);
}

.bt-science-inheritance h3 {
    font-size: 1.25rem;
    color: var(--bt-primary);
    margin-bottom: 1rem;
}

.bt-science-inheritance p {
    color: var(--bt-text);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.bt-science-inheritance p:last-child {
    margin-bottom: 0;
}

.bt-quote-science {
    margin-top: 3rem;
    text-align: center;
    border-left: none;
    border-top: 4px solid var(--bt-accent);
    border-radius: var(--bt-radius-md);
}

/* ========================================
   CTA Section
   ======================================== */
.bt-section-cta {
    background: linear-gradient(180deg, var(--bt-bg-warm) 0%, var(--bt-bg-cream) 100%);
    padding: 120px 0;
}

.bt-cta-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.bt-cta-title {
    font-size: clamp(2rem, 5vw, 3rem);
    color: var(--bt-dark);
    margin-bottom: 2rem;
}

.bt-cta-quote {
    background: transparent;
    border: none;
    padding: 0;
    margin-bottom: 2rem;
    box-shadow: none;
}

.bt-cta-quote p {
    font-family: var(--bt-font-serif);
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-style: italic;
    color: var(--bt-primary);
    line-height: 1.5;
}

.bt-cta-lead {
    font-size: 1.15rem;
    color: var(--bt-text-muted);
    margin-bottom: 3rem;
}

.bt-cta-box {
    background: var(--bt-white);
    border-radius: var(--bt-radius-xl);
    padding: 3rem;
    box-shadow: var(--bt-shadow-lg);
    border: 1px solid var(--bt-border);
}

.bt-cta-badge {
    display: inline-flex;
    align-items: center;
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: var(--bt-white);
    padding: 8px 20px;
    border-radius: var(--bt-radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.bt-cta-box h3 {
    font-size: 1.75rem;
    color: var(--bt-dark);
    margin-bottom: 0.75rem;
}

.bt-cta-box > p {
    color: var(--bt-text-muted);
    margin-bottom: 1.5rem;
}

.bt-cta-features {
    list-style: none;
    padding: 0;
    margin: 0 0 2rem;
    text-align: left;
    max-width: 300px;
    margin-left: auto;
    margin-right: auto;
}

.bt-cta-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0;
    color: var(--bt-text);
}

.bt-cta-features li i {
    color: var(--bt-secondary);
}

.bt-cta-button {
    display: inline-flex;
    align-items: center;
    background: var(--bt-primary);
    color: var(--bt-white);
    padding: 18px 40px;
    border-radius: var(--bt-radius-full);
    font-size: 1.15rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--bt-transition);
    box-shadow: var(--bt-shadow-md);
}

.bt-cta-button:hover {
    background: var(--bt-primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--bt-shadow-lg);
    color: var(--bt-white);
    text-decoration: none;
}

.bt-cta-button:focus {
    outline: 3px solid var(--bt-accent);
    outline-offset: 3px;
}

.bt-cta-note {
    font-size: 0.85rem;
    color: var(--bt-text-muted);
    margin-top: 1rem;
    margin-bottom: 0;
}

/* ========================================
   FAQ Section
   ======================================== */
.bt-section-faq {
    background: var(--bt-bg-light);
    padding: 80px 0;
}

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

.bt-faq-item {
    background: var(--bt-white);
    border-radius: var(--bt-radius-md);
    padding: 1.75rem;
    box-shadow: var(--bt-shadow-sm);
    border: 1px solid var(--bt-border);
}

.bt-faq-item h3 {
    font-size: 1.1rem;
    color: var(--bt-primary);
    margin-bottom: 0.75rem;
    font-family: var(--bt-font-sans);
    font-weight: 600;
}

.bt-faq-item p {
    color: var(--bt-text-muted);
    font-size: 0.95rem;
    margin: 0;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .bt-faq-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Animations
   ======================================== */
.animate-fade-in {
    animation: bt-fadeIn 0.8s ease-out forwards;
}

.animate-fade-in-up {
    animation: bt-fadeInUp 0.8s ease-out forwards;
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--bt-transition-slow);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { animation-delay: 0.15s; }
.delay-2 { animation-delay: 0.3s; }
.delay-3 { animation-delay: 0.45s; }
.delay-4 { animation-delay: 0.6s; }

.animate-on-scroll.delay-1 { transition-delay: 0.1s; }
.animate-on-scroll.delay-2 { transition-delay: 0.2s; }
.animate-on-scroll.delay-3 { transition-delay: 0.3s; }

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

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

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 991px) {
    .bt-section {
        padding: 80px 0;
    }
    
    .bt-section-narrative,
    .bt-section-unity,
    .bt-section-cta {
        padding: 80px 0;
    }
    
    .bt-hero-content {
        padding: 100px 20px 50px;
    }
    
    .bt-stat-divider {
        display: none;
    }
    
    .bt-hero-stats {
        gap: 1.5rem;
    }
    
    .bt-guidance-item {
        flex-direction: column;
        text-align: center;
    }
    
    .bt-guidance-number {
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .bt-section {
        padding: 60px 0;
    }
    
    .bt-section-header {
        margin-bottom: 3rem;
    }
    
    .bt-card,
    .bt-reveal-card {
        padding: 2rem;
    }
    
    .bt-history-item {
        padding: 1.25rem 1.5rem;
    }
    
    .bt-unity-visual {
        transform: scale(0.8);
    }
    
    .bt-report-preview {
        padding: 1.5rem;
    }
    
    .bt-type-display {
        font-size: 4rem;
    }
    
    .bt-cta-box {
        padding: 2rem;
    }
    
    .bt-exp-feature {
        flex-direction: column;
        text-align: center;
    }
    
    .bt-exp-icon {
        margin: 0 auto;
    }
}

@media (max-width: 576px) {
    .bt-hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .bt-stat-item {
        padding: 0.5rem 0;
    }
    
    .bt-hero-badge {
        font-size: 0.8rem;
        padding: 8px 18px;
    }
    
    .bt-cta-primary {
        padding: 14px 28px;
        font-size: 1rem;
    }
    
    .bt-scroll-indicator {
        display: none;
    }
    
    .bt-quote {
        padding: 1.5rem;
    }
    
    .bt-quote p {
        font-size: 1.1rem;
    }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .bt-scroll-progress,
    .bt-page-nav,
    .bt-back-to-top,
    .bt-scroll-indicator,
    .bt-hero-cta,
    .bt-cta-button {
        display: none !important;
    }
    
    .bt-hero {
        min-height: auto;
        padding: 40px 20px;
    }
    
    .bt-section {
        padding: 40px 0;
    }
    
    .bt-card,
    .bt-reveal-card,
    .bt-science-card {
        break-inside: avoid;
    }
}

/* ========================================
   RELATED PRODUCTS
   ======================================== */
.bloodtype-related-products {
    padding: 60px 0;
    background: var(--bt-bg-cream);
}

.bloodtype-related-title {
    text-align: center;
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    color: var(--bt-text);
    margin-bottom: 40px;
    font-family: var(--bt-font-serif);
    font-weight: 700;
}

.bloodtype-related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

@media (max-width: 991px) {
    .bloodtype-related-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 575px) {
    .bloodtype-related-grid {
        grid-template-columns: 1fr;
    }
}

.bloodtype-related-card {
    background: var(--bt-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(93, 78, 55, 0.1);
    transition: 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
    border: 1px solid var(--bt-border);
}

.bloodtype-related-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(93, 78, 55, 0.15);
}

.bloodtype-related-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-bottom: 1px solid var(--bt-border);
}

.bloodtype-related-content {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.bloodtype-related-content h4 {
    font-size: 1.2rem;
    color: var(--bt-text);
    margin-bottom: 8px;
    font-family: var(--bt-font-sans);
    font-weight: 600;
}

.bloodtype-related-content p {
    font-size: 0.95rem;
    color: var(--bt-text-muted);
    line-height: 1.6;
    margin-bottom: 16px;
    flex-grow: 1;
}

.bloodtype-related-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--bt-accent);
    font-weight: 600;
    text-decoration: none;
    transition: 0.3s ease;
    margin-top: auto;
}

.bloodtype-related-link:hover {
    color: var(--bt-accent-dark);
    text-decoration: underline;
}

.bloodtype-related-link i {
    transition: transform 0.2s ease;
}

.bloodtype-related-link:hover i {
    transform: translateX(4px);
}