/* CSS Variables - DRY Design System */
:root {
    /* Color Palette */
    --clr-primary: #FFD966; /* Bright Yellow */
    --clr-secondary: #3D85C6; /* Soft Blue */
    --clr-accent: #E06666; /* Playful Red */
    --clr-text-main: #2C3E50;
    --clr-text-light: #ECF0F1;
    --clr-bg-main: #FAFAFA;
    --clr-bg-alt: #F4F6F7;
    --clr-dark: #1A252F;
    
    /* Typography */
    --font-heading: 'Fredoka', sans-serif;
    --font-body: 'Nunito', sans-serif;
    
    /* Spacing */
    --space-sm: 0.5rem;
    --space-md: 1.5rem;
    --space-lg: 3rem;
    --space-xl: 5rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    
    /* Shadows */
    --shadow-soft: 0 10px 25px rgba(0,0,0,0.05);
    --shadow-strong: 0 20px 40px rgba(0,0,0,0.15);
    --shadow-glow: 0 0 20px rgba(255, 217, 102, 0.6);
}

/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    overflow-x: clip;
}

body {
    font-family: var(--font-body);
    color: var(--clr-text-main);
    background-color: #1a252f;
    background-image:
        linear-gradient(135deg, #1e2d3a 25%, transparent 25%),
        linear-gradient(225deg, #1e2d3a 25%, transparent 25%),
        linear-gradient(45deg, #1e2d3a 25%, transparent 25%),
        linear-gradient(315deg, #1e2d3a 25%, #1a252f 25%);
    background-size: 40px 40px;
    background-position: 20px 10px, 20px 10px, 0 10px, 0 10px;
    background-attachment: fixed;
    line-height: 1.6;
}

/* Page wrapper - single column layout */
.page-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--clr-bg-main);
}

@media (min-width: 1240px) {
    .page-wrapper {
        margin: var(--space-lg) auto;
        border-radius: 12px;
        box-shadow: var(--shadow-strong);
        overflow: hidden;
    }
}

h1, h2, h3 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
    color: var(--clr-text-main);
}

h1 {
    font-size: clamp(3rem, 8vw, 5rem);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

h2 {
    font-size: clamp(2rem, 5vw, 3rem);
}

p {
    font-size: 1.1rem;
    margin-bottom: var(--space-sm);
}

/* Layout Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: var(--space-xl) 0;
}

.text-center { text-align: center; }
.text-light { color: var(--clr-text-light); }

/* Hero Section */
.hero {
    width: 100%;
    margin: 0;
    padding: 0;
}

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

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

/* Intro Section */
.intro-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    align-items: center;
    margin-top: var(--space-lg);
}

@media (min-width: 768px) {
    .intro-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.age-badge {
    display: inline-block;
    background: var(--clr-primary);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.2rem;
    margin: var(--space-md) 0;
    color: var(--clr-dark);
    box-shadow: var(--shadow-soft);
}

/* Buttons */
.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.2rem;
    text-decoration: none;
    transition: var(--transition-smooth);
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-soft);
}

.cta-button.primary {
    background-color: var(--clr-secondary);
    color: white;
}

.cta-button.secondary {
    background-color: white;
    color: var(--clr-secondary);
    border: 2px solid var(--clr-secondary);
}

/* Details Card */
.details {
    background-color: var(--clr-bg-alt);
    background-image: url('../assets/images/bg-pattern-argyle.jpg');
    background-size: cover;
    background-attachment: fixed;
}

.details-card {
    background: white;
    max-width: 600px;
    margin: 0 auto;
    padding: clamp(1.5rem, 5vw, var(--space-lg));
    border-radius: 20px;
    box-shadow: var(--shadow-soft);
    text-align: center;
    position: relative;
    border-top: 8px solid var(--clr-accent);
}

.book-specs {
    list-style: none;
    margin-top: var(--space-md);
    text-align: left;
    display: inline-block;
}

.book-specs li {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.book-specs .icon {
    font-size: 1.5rem;
}

/* Author Section */
.author {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    align-items: center;
    text-align: center;
}

.author-content {
    max-width: 800px;
    margin: 0 auto;
}

.author-highlight {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--clr-secondary);
}

/* Footer */
.footer {
    background-color: var(--clr-dark);
    color: var(--clr-text-light);
    text-align: center;
}

.footer h2 {
    color: var(--clr-primary);
}

.buy-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-bottom: var(--space-lg);
}

.contact-info p {
    color: #BDC3C7;
}

.contact-info h3 {
    font-size: clamp(1.5rem, 4vw, 2rem);
}

/* Contact Form */
.contact-form {
    max-width: 400px;
    margin: var(--space-md) auto 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.contact-form input,
.contact-form textarea {
    font-family: var(--font-body);
    font-size: 1rem;
    padding: 0.75rem 1rem;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 10px;
    background: rgba(255,255,255,0.1);
    color: white;
    resize: vertical;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: #999;
}

.hidden {
    display: none;
}

.link-hover {
    color: var(--clr-primary);
    text-decoration: none;
    border-bottom: 1px dashed var(--clr-primary);
    transition: var(--transition-fast);
}

.link-hover:hover {
    color: white;
    border-bottom-color: white;
}

/* Carousel/Gallery (Simplified Grid for Static) */
.bg-pattern {
    background-color: var(--clr-bg-alt);
    background-image: url('../assets/images/bg-pattern-zigzag.jpg');
    background-size: cover;
}

.bg-dark {
    background-color: #2C3E50;
    background-image: url('../assets/images/bg-pattern-bubbles.jpg');
    background-size: cover;
}

.carousel-track {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: var(--space-lg);
}

.carousel-image {
    width: 100%;
    height: auto;
    border-radius: 15px;
    object-fit: cover;
    box-shadow: var(--shadow-soft);
}

.gallery-note {
    text-align: center;
    font-size: 0.85rem;
    color: #555;
    margin-top: -0.5rem;
    background: rgba(255,255,255,0.85);
    display: inline-block;
    padding: 0.25rem 1rem;
    border-radius: 50px;
    width: 100%;
}

.shadow-light {
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

/* --- ANIMATIONS --- */

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.4s ease-out, transform 0.4s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-up {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.visible .slide-up {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.2s; }
.delay-2 { transition-delay: 0.4s; }

.hover-grow {
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.hover-grow:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-strong);
}

.hover-lift {
    transition: transform var(--transition-smooth);
}

.hover-lift:hover {
    transform: translateY(-10px);
}

.hover-glow:hover {
    box-shadow: var(--shadow-glow);
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
    100% { transform: translateY(0px); }
}

.floating-image {
    width: 100%;
    max-width: 400px;
    border-radius: 20px;
    box-shadow: var(--shadow-strong);
    animation: float 6s ease-in-out infinite;
}

.floating-image-slow {
    width: 100%;
    max-width: 400px;
    border-radius: 20px;
    box-shadow: var(--shadow-strong);
    animation: float 8s ease-in-out infinite reverse;
    cursor: pointer;
}

/* Lightbox Styles */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
}

.lightbox.active {
    opacity: 1;
    pointer-events: auto;
}

.lightbox-img {
    max-width: 90%;
    max-height: 90%;
    box-shadow: 0 0 50px rgba(0,0,0,0.5);
    border-radius: 10px;
    transform: scale(0.9);
    transition: transform var(--transition-smooth);
}

.lightbox.active .lightbox-img {
    transform: scale(1);
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 30px;
    color: white;
    font-size: 3rem;
    cursor: pointer;
    font-family: sans-serif;
    transition: color var(--transition-fast);
}

.lightbox-close:hover {
    color: var(--clr-primary);
}

.clickable-image {
    cursor: pointer;
}

/* Lightbox Navigation */
.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.1);
    border: none;
    color: white;
    font-size: 3rem;
    padding: 1rem;
    cursor: pointer;
    border-radius: 5px;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.lightbox-nav:hover {
    background: rgba(255,255,255,0.3);
    color: var(--clr-primary);
}

.lightbox-prev {
    left: 20px;
}

.lightbox-next {
    right: 20px;
}

/* Gradient overlay utility - smooths transitions between sections */
.gradient-top {
    position: relative;
}
.gradient-top::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: linear-gradient(to bottom, rgba(0,0,0,0.4), transparent);
    z-index: 1;
    pointer-events: none;
}

.bg-gem {
    background-color: var(--clr-bg-alt);
    background-image: url('../assets/images/divider-red-gem.jpg');
    background-size: cover;
    background-attachment: fixed;
}
/* Updated Typography & Footer */
.intro-heading {
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    color: var(--clr-secondary);
    max-width: 800px;
    margin: 0 auto var(--space-md);
    overflow-wrap: break-word;
}

.lead-text {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--clr-dark);
}

.footer-heading {
    color: var(--clr-primary);
    margin-bottom: var(--space-md);
}

.buy-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
    max-width: 800px;
    margin: 0 auto var(--space-lg);
}

@media (min-width: 768px) {
    .buy-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.buy-card {
    background: rgba(255,255,255,0.05);
    padding: var(--space-md);
    border-radius: 10px;
    border: 1px solid rgba(255,255,255,0.1);
}

.buy-card h3 {
    color: white;
    margin-bottom: 0.5rem;
}

.buy-card .price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--clr-primary);
}

.buy-card .small {
    font-size: 0.9rem;
    margin-bottom: var(--space-md);
}