/* ==========================================================================
   CSS VARIABLES & THEMING (PURPLE PALETTE)
   ========================================================================== */
   :root {
    /* Color Palette */
    --purple-50:  #faf5ff;
    --purple-100: #f3e8ff;
    --purple-200: #e9d5ff;
    --purple-300: #d8b4fe;
    --purple-400: #c084fc;
    --purple-500: #a855f7;
    --purple-600: #9333ea;
    --purple-700: #7e22ce;
    --purple-800: #6b21a8;
    --purple-900: #581c87;
    
    /* Semantic Colors */
    --page-bg: #fdfcff;
    --primary: var(--purple-700);
    --primary-light: var(--purple-500);
    --primary-dark: var(--purple-900);
    --neutral-darker: #1e1b24;
    --neutral-dark: #2d2836;
    --neutral: #4a4553;
    --neutral-light: #6b6675;
    --neutral-muted: #95919e;

    /* Gradients */
    --grad-primary: linear-gradient(135deg, var(--purple-500) 0%, var(--purple-700) 100%);
    --grad-primary-hover: linear-gradient(135deg, var(--purple-600) 0%, var(--purple-800) 100%);
    --grad-soft: linear-gradient(180deg, rgba(250,245,255,1) 0%, rgba(243,232,255,0.4) 100%);
    
    /* Shadows - Layered & Tinted */
    --shadow-sm: 0 1px 2px rgba(107, 33, 168, 0.05);
    --shadow-md: 0 4px 12px rgba(107, 33, 168, 0.08);
    --shadow-lg: 0 10px 25px rgba(107, 33, 168, 0.12);
    --shadow-xl: 0 20px 40px rgba(107, 33, 168, 0.15);
    --shadow-mega: 0 20px 50px rgba(126, 34, 206, 0.3), 0 0 0 1px rgba(255,255,255,0.2) inset;
    --shadow-glow: 0 0 15px rgba(168, 85, 247, 0.5);
    
    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-serif: 'Playfair Display', serif;
    
    /* Transitions */
    --trans-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --trans-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --trans-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    --trans-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ==========================================================================
   RESET & BASE
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    background-color: var(--page-bg);
    color: var(--neutral);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background-color: var(--purple-200);
    color: var(--primary-dark);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: var(--purple-50);
}
::-webkit-scrollbar-thumb {
    background: var(--purple-300);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--purple-400);
}

/* ==========================================================================
   UTILITIES & HELPERS
   ========================================================================== */
.bg-gradient-purple {
    background: var(--grad-primary);
}

.text-gradient {
    background: var(--grad-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.shadow-mega {
    box-shadow: var(--shadow-mega);
}

/* ==========================================================================
   BACKGROUND DECORATIONS
   ========================================================================== */
.bg-shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    z-index: 0;
    pointer-events: none;
    opacity: 0.5;
    animation: floatShape 20s infinite alternate ease-in-out;
}

.bg-shape-1 {
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, var(--purple-200) 0%, rgba(255,255,255,0) 70%);
    top: -10%;
    left: -10%;
}

.bg-shape-2 {
    width: 40vw;
    height: 40vw;
    background: radial-gradient(circle, var(--purple-100) 0%, rgba(255,255,255,0) 70%);
    top: 30%;
    right: -10%;
    animation-delay: -5s;
}

.bg-shape-3 {
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, var(--purple-50) 0%, rgba(255,255,255,0) 70%);
    bottom: -10%;
    left: 20%;
    animation-delay: -10s;
}

@keyframes floatShape {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(5%, 5%) scale(1.05); }
    100% { transform: translate(-5%, -2%) scale(0.95); }
}

/* ==========================================================================
   HEADER
   ========================================================================== */
.glass-header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(233, 213, 255, 0.5); /* border-purple-200 / 50 */
    box-shadow: 0 4px 30px rgba(107, 33, 168, 0.03);
}

.header-progress-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 2px;
    background: var(--grad-primary);
    width: 0%;
    /* CSS only trick for scroll progress is hard without JS, 
       but we can leave the decorative line static or animated gently */
    width: 100%;
    opacity: 0.3;
}

/* ==========================================================================
   PRODUCT SECTION / HERO CARD
   ========================================================================== */
.product-card {
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.6);
    background: linear-gradient(145deg, #ffffff 0%, #faf8ff 100%);
}

.product-card::before {
    content: '';
    position: absolute;
    top: -2px; left: -2px; right: -2px; bottom: -2px;
    background: linear-gradient(45deg, var(--purple-200), transparent, var(--purple-100));
    z-index: -1;
    border-radius: inherit;
    opacity: 0.5;
}

/* Typography in Hero */
.product-title {
    font-family: var(--font-serif);
    letter-spacing: -0.02em;
}

.meta-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.premium-badge {
    background-color: var(--purple-100);
    color: var(--purple-800);
    border: 1px solid var(--purple-200);
}

.safe-badge {
    background-color: #ecfdf5;
    color: #047857;
    border: 1px solid #d1fae5;
}

/* Features List Blocks */
.features-list-wrapper {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    padding: 1.25rem;
    background: white;
    border-radius: 1rem;
    border: 1px solid var(--purple-50);
    box-shadow: var(--shadow-sm);
    transition: transform var(--trans-normal), box-shadow var(--trans-normal), border-color var(--trans-normal);
}

.feature-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--purple-200);
}

.feature-icon {
    flex-shrink: 0;
    width: 2.5rem;
    height: 2.5rem;
    background: var(--purple-50);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    margin-right: 1.25rem;
    transition: background var(--trans-normal), color var(--trans-normal);
}

.feature-item:hover .feature-icon {
    background: var(--primary);
    color: white;
}

.feature-text {
    font-size: 0.9375rem;
    color: var(--neutral);
    line-height: 1.6;
}

/* ==========================================================================
   CSS-ONLY GALLERY LOGIC & STYLING
   ========================================================================== */
.gallery-main-container {
    box-shadow: inset 0 0 0 1px var(--purple-100), var(--shadow-md);
    overflow: hidden;
}

/* Decorative Corners for Gallery */
.corner-accent {
    position: absolute;
    width: 30px;
    height: 30px;
    border: 2px solid transparent;
    opacity: 0.3;
    pointer-events: none;
    z-index: 5;
}
.corner-accent.top-left { top: 1rem; left: 1rem; border-top-color: var(--primary); border-left-color: var(--primary); }
.corner-accent.top-right { top: 1rem; right: 1rem; border-top-color: var(--primary); border-right-color: var(--primary); }
.corner-accent.bottom-left { bottom: 1rem; left: 1rem; border-bottom-color: var(--primary); border-left-color: var(--primary); }
.corner-accent.bottom-right { bottom: 1rem; right: 1rem; border-bottom-color: var(--primary); border-right-color: var(--primary); }

/* Hide all main images by default */
.main-img-wrap {
    opacity: 0;
    visibility: hidden;
    transform: scale(0.95) translateY(10px);
    transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1), visibility 0.5s;
    z-index: 1;
}

/* When specific radio is checked, show corresponding image */
#gal-1:checked ~ .gallery-main-container .img-wrap-1,
#gal-2:checked ~ .gallery-main-container .img-wrap-2,
#gal-3:checked ~ .gallery-main-container .img-wrap-3,
#gal-4:checked ~ .gallery-main-container .img-wrap-4 {
    opacity: 1;
    visibility: visible;
    transform: scale(1) translateY(0);
    z-index: 10;
}

/* Thumbnail Styling */
.thumb-label {
    border: 2px solid transparent;
    transition: all var(--trans-fast);
    position: relative;
    overflow: hidden;
}

.thumb-label::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(107, 33, 168, 0.0);
    transition: background var(--trans-fast);
}

.thumb-label:hover {
    border-color: var(--purple-300);
    box-shadow: var(--shadow-sm);
}

.thumb-label:hover::after {
    background: rgba(107, 33, 168, 0.05);
}

/* Active State for Thumbnails based on Radio checked state */
#gal-1:checked ~ .gallery-thumbs label[for="gal-1"],
#gal-2:checked ~ .gallery-thumbs label[for="gal-2"],
#gal-3:checked ~ .gallery-thumbs label[for="gal-3"],
#gal-4:checked ~ .gallery-thumbs label[for="gal-4"] {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--purple-100), var(--shadow-md);
    transform: translateY(-2px);
}

/* ==========================================================================
   CTA SECTION
   ========================================================================== */
.cta-section {
    overflow: hidden;
    border-radius: 2rem;
}

.cta-bg-glow {
    background: radial-gradient(ellipse at center, var(--purple-200) 0%, transparent 70%);
    opacity: 0.6;
    transform: scale(1.5);
}

.cta-content-wrapper {
    position: relative;
}

.cta-content-wrapper::before {
    content: '';
    position: absolute;
    top: -1px; left: -1px; right: -1px; bottom: -1px;
    background: linear-gradient(135deg, rgba(255,255,255,0.8), rgba(255,255,255,0.2));
    border-radius: inherit;
    z-index: -1;
}

/* CTA Button Animations */
.cta-button {
    position: relative;
    overflow: hidden;
    z-index: 2;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 50%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transform: skewX(-20deg);
    animation: shine 4s infinite;
}

.cta-button:hover {
    transform: translateY(-4px);
    box-shadow: 0 25px 50px rgba(126, 34, 206, 0.4), 0 0 0 2px rgba(255,255,255,0.3) inset;
    background: var(--grad-primary-hover);
}

.cta-button:active {
    transform: translateY(1px);
    box-shadow: 0 10px 20px rgba(126, 34, 206, 0.3);
}

.cta-pulse-ring {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 100%; height: 100%;
    background: var(--primary);
    border-radius: 1rem; /* match button */
    z-index: 1;
    animation: pulseRing 2.5s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
}

@keyframes shine {
    0% { left: -100%; }
    20% { left: 200%; }
    100% { left: 200%; }
}

@keyframes pulseRing {
    0% { transform: translate(-50%, -50%) scale(1); opacity: 0.6; }
    80% { transform: translate(-50%, -50%) scale(1.3); opacity: 0; }
    100% { transform: translate(-50%, -50%) scale(1.3); opacity: 0; }
}

/* ==========================================================================
   REVIEWS SECTION (AMAZON STYLE BUT ENHANCED)
   ========================================================================== */
.reviews-section::before {
    content: '';
    position: absolute;
    top: 0; left: 50%; transform: translateX(-50%);
    width: 100vw; height: 100%;
    background: linear-gradient(180deg, transparent, rgba(243, 232, 255, 0.4) 10%, transparent);
    z-index: 0;
    pointer-events: none;
}

.review-card {
    border: 1px solid var(--purple-100);
    box-shadow: var(--shadow-sm);
}

.review-border-top {
    position: absolute;
    top: 0; left: 0;
    width: 0; height: 4px;
    background: var(--grad-primary);
    transition: width var(--trans-slow);
}

.review-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
    border-color: var(--purple-200);
}

.review-card:hover .review-border-top {
    width: 100%;
}

.review-avatar-wrap img {
    transition: transform var(--trans-bounce);
}

.review-card:hover .review-avatar-wrap img {
    transform: scale(1.1) rotate(5deg);
}

.stars-icon svg {
    filter: drop-shadow(0 1px 1px rgba(0,0,0,0.1));
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.main-footer {
    position: relative;
}

.footer-bg-shape {
    background-image: radial-gradient(circle at center, var(--purple-500) 0%, transparent 60%);
    background-size: 100% 100%;
    background-position: center top;
}

.footer-link::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 0%; height: 1px;
    background: var(--purple-200);
    transition: width var(--trans-fast);
}

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

/* ==========================================================================
   MEDIA QUERIES (MOBILE FIRST ADAPTATION & RESPONSIVENESS)
   ========================================================================== */

/* Extra Small Devices (Phones, 320px and up) */
@media (max-width: 479px) {
    .header-inner h1 {
        font-size: 0.875rem;
    }
    
    .product-card {
        padding: 1.5rem;
        border-radius: 1.5rem;
    }
    
    .product-title {
        font-size: 1.75rem;
    }
    
    .gallery-main-container {
        padding: 1rem;
        height: 250px;
    }
    
    .cta-button {
        width: 100%;
        padding-left: 1rem;
        padding-right: 1rem;
        font-size: 1.25rem;
    }
    
    .review-card {
        padding: 1.25rem;
    }
    
    .feature-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .feature-icon {
        margin-bottom: 1rem;
    }
}

/* Small Devices (Phones / small tablets, 480px - 767px) */
@media (min-width: 480px) and (max-width: 767px) {
    .gallery-main-container {
        height: 350px;
    }
}

/* Medium Devices (Tablets, 768px and up) */
@media (min-width: 768px) {
    .product-hero {
        padding-top: 2rem;
    }
    
    .gallery-main-container {
        height: auto;
    }
    
    .footer-nav ul {
        flex-direction: row;
    }
}

/* Large Devices (Desktops, 1024px and up) */
@media (min-width: 1024px) {
    .gallery-wrapper {
        position: sticky;
        top: 100px;
    }
    
    .product-info-wrapper {
        padding-left: 1.5rem;
    }
}

/* Extra Large Devices (Large Desktops, 1280px and up) */
@media (min-width: 1280px) {
    .product-card {
        padding: 4rem;
    }
}
.gallery-main-container {
    width: 100%;
    aspect-ratio: 1 / 1;
    min-height: 320px;
}

@media (max-width: 480px) {
    .gallery-main-container {
        min-height: 280px;
    }
}