/* =============================================
   BELAPELE - Main Stylesheet
   Light Pink Color Palette
   ============================================= */

/* CSS Variables */
:root {
    /* Pink Palette */
    --pink-50: #fdf2f4;
    --pink-100: #fce7eb;
    --pink-200: #f9d0d9;
    --pink-300: #f4a9ba;
    --pink-400: #ed7a95;
    --pink-500: #e14d6f;
    --pink-600: #cd2d54;
    --pink-700: #ac2145;
    --pink-800: #8f1e3d;
    --pink-900: #791d39;

    /* Neutrals */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Semantic Colors */
    --primary: var(--pink-400);
    --primary-light: var(--pink-100);
    --primary-dark: var(--pink-600);
    --text-primary: var(--gray-800);
    --text-secondary: var(--gray-600);
    --text-light: var(--gray-400);
    --background: var(--white);
    --background-soft: var(--pink-50);

    /* Typography */
    --font-display: 'Playfair Display', serif;
    --font-body: 'Poppins', sans-serif;

    /* Spacing */
    --section-padding: 6rem 0;
    --container-padding: 0 1.5rem;

    /* Transitions */
    --transition: all 0.3s ease;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--container-padding);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--primary);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 2px solid var(--gray-300);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-small {
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
}

.btn-full {
    width: 100%;
}

/* Section Styling */
.section-tag {
    display: inline-block;
    padding: 0.375rem 1rem;
    background-color: var(--primary-light);
    color: var(--primary-dark);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 50px;
    margin-bottom: 1rem;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 4rem;
}

.section-header p {
    margin-top: 1rem;
    color: var(--text-secondary);
}

/* =============================================
   HEADER & NAVIGATION
   ============================================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--primary);
}

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

/* Language Toggle */
.lang-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 1.5rem;
}

.lang-btn {
    background: none;
    border: none;
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    transition: var(--transition);
}

.lang-btn:hover {
    color: var(--primary);
}

.lang-btn.active {
    color: var(--primary);
    background-color: var(--primary-light);
}

.lang-divider {
    color: var(--gray-300);
    font-size: 0.875rem;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition);
}

/* =============================================
   HERO SECTION
   ============================================= */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--pink-50) 0%, var(--white) 50%, var(--pink-100) 100%);
    padding-top: 80px;
}

.hero-content {
    max-width: 700px;
}

.hero h1 {
    margin-bottom: 1.5rem;
}

.highlight {
    color: var(--primary);
    position: relative;
}

.hero p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* =============================================
   ABOUT SECTION
   ============================================= */
.about {
    padding: var(--section-padding);
    background-color: var(--white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h2 {
    margin-bottom: 1.5rem;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.about-features {
    margin-top: 2rem;
}

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

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 700;
}

.about-image {
    display: flex;
    justify-content: center;
}

.image-placeholder {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 3/4;
    background: linear-gradient(135deg, var(--pink-100) 0%, var(--pink-200) 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 1.125rem;
}

.image-placeholder.small {
    aspect-ratio: 1;
    max-width: 100%;
}

/* =============================================
   PRODUCTS SECTION
   ============================================= */
.products {
    padding: var(--section-padding);
    background-color: var(--background-soft);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.product-card {
    background-color: var(--white);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.product-image {
    position: relative;
    padding: 1.5rem;
    background-color: var(--pink-50);
}

.product-badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    padding: 0.25rem 0.75rem;
    background-color: var(--primary);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 50px;
}

.product-info {
    padding: 1.5rem;
}

.product-category {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--primary);
    font-weight: 600;
}

.product-info h3 {
    margin: 0.5rem 0;
}

.product-info p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.product-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.product-price {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.products-cta {
    text-align: center;
    margin-top: 3rem;
}

/* =============================================
   SCIENCE SECTION
   ============================================= */
.science {
    padding: var(--section-padding);
    background-color: var(--white);
}

.science-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.science-card {
    padding: 2rem;
    background-color: var(--background-soft);
    border-radius: 16px;
    transition: var(--transition);
}

.science-card:hover {
    background-color: var(--pink-100);
}

.science-number {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    color: var(--pink-200);
    margin-bottom: 1rem;
}

.science-card h3 {
    margin-bottom: 0.75rem;
}

.science-card p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

/* =============================================
   TESTIMONIALS SECTION
   ============================================= */
.testimonials {
    padding: var(--section-padding);
    background: linear-gradient(135deg, var(--pink-50) 0%, var(--pink-100) 100%);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.testimonial-stars {
    color: #fbbf24;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.testimonial-card p {
    font-size: 1rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 1.5rem;
}

.testimonial-author {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-weight: 600;
    color: var(--text-primary);
}

.author-info {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* =============================================
   CONTACT SECTION
   ============================================= */
.contact {
    padding: var(--section-padding);
    background-color: var(--white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info h2 {
    margin-bottom: 1rem;
}

.contact-info > p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 1rem;
}

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

.contact-method strong {
    display: block;
    color: var(--text-primary);
}

.contact-method p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.contact-form {
    background-color: var(--background-soft);
    padding: 2.5rem;
    border-radius: 16px;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    font-family: var(--font-body);
    font-size: 1rem;
    border: 2px solid var(--gray-200);
    border-radius: 10px;
    transition: var(--transition);
    background-color: var(--white);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* =============================================
   FOOTER
   ============================================= */
.footer {
    background-color: var(--gray-900);
    color: var(--gray-300);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-brand .logo {
    color: var(--white);
    margin-bottom: 1rem;
    display: inline-block;
}

.footer-brand p {
    font-size: 0.9375rem;
    max-width: 300px;
}

.footer-links h4 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links a {
    font-size: 0.9375rem;
    color: var(--gray-400);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--gray-800);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* =============================================
   INGREDIENT PAGE (Hyaluronic Acid)
   ============================================= */
.hero-ingredient {
    text-align: center;
    min-height: 60vh;
}

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

.hero-ingredient .section-tag {
    margin-bottom: 1.5rem;
}

.hero-ingredient h1 {
    margin-bottom: 1.5rem;
}

/* Ingredient Section */
.ingredient-section {
    padding: var(--section-padding);
    background-color: var(--white);
}

.ingredient-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.ingredient-text h2 {
    margin-bottom: 1.5rem;
}

.ingredient-text p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.ingredient-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.molecule-graphic {
    position: relative;
}

.molecule-circle {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--pink-100) 0%, var(--pink-300) 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
}

.molecule-circle span {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-dark);
}

.molecule-circle sub {
    font-size: 1.5rem;
}

.molecule-label {
    font-size: 1rem !important;
    font-family: var(--font-body) !important;
    font-weight: 600 !important;
    color: var(--primary) !important;
    margin-top: 0.5rem;
}

/* Benefits Section */
.benefits-section {
    padding: var(--section-padding);
    background-color: var(--background-soft);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.benefit-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

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

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

.benefit-card h3 {
    margin-bottom: 0.75rem;
}

.benefit-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* Types Section */
.types-section {
    padding: var(--section-padding);
    background-color: var(--white);
}

.types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.type-card {
    background-color: var(--background-soft);
    padding: 2rem;
    border-radius: 16px;
    transition: var(--transition);
}

.type-card:hover {
    background-color: var(--pink-100);
}

.type-weight {
    display: inline-block;
    padding: 0.375rem 1rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
}

.type-weight.high {
    background-color: var(--pink-200);
    color: var(--pink-700);
}

.type-weight.medium {
    background-color: var(--pink-300);
    color: var(--pink-800);
}

.type-weight.low {
    background-color: var(--pink-400);
    color: var(--white);
}

.type-card h3 {
    margin-bottom: 0.75rem;
}

.type-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.expert-tip {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background-color: var(--primary-light);
    padding: 1.5rem 2rem;
    border-radius: 12px;
    border-left: 4px solid var(--primary);
}

.tip-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.tip-content strong {
    display: block;
    color: var(--primary-dark);
    margin-bottom: 0.5rem;
}

.tip-content p {
    color: var(--text-secondary);
    margin: 0;
}

/* How To Section */
.howto-section {
    padding: var(--section-padding);
    background-color: var(--background-soft);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.step-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 16px;
    position: relative;
    box-shadow: var(--shadow-sm);
}

.step-number {
    position: absolute;
    top: -15px;
    left: 2rem;
    width: 40px;
    height: 40px;
    background-color: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
}

.step-card h3 {
    margin-bottom: 0.75rem;
    padding-top: 0.5rem;
}

.step-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* Ingredient CTA */
.ingredient-cta {
    padding: var(--section-padding);
    background: linear-gradient(135deg, var(--pink-400) 0%, var(--pink-500) 100%);
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.ingredient-cta h2 {
    color: var(--white);
    margin-bottom: 1rem;
}

.ingredient-cta p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
}

.ingredient-cta .btn-primary {
    background-color: var(--white);
    color: var(--primary-dark);
}

.ingredient-cta .btn-primary:hover {
    background-color: var(--pink-50);
    transform: translateY(-2px);
}

/* Active nav link */
.nav-links a.active {
    color: var(--primary);
}

.nav-links a.active::after {
    width: 100%;
}

/* =============================================
   RESPONSIVE DESIGN
   ============================================= */
@media (max-width: 992px) {
    .about-content,
    .contact-content,
    .ingredient-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .about-image,
    .ingredient-visual {
        order: -1;
    }

    .image-placeholder {
        max-width: 300px;
        aspect-ratio: 1;
    }

    .molecule-circle {
        width: 160px;
        height: 160px;
    }

    .molecule-circle span {
        font-size: 2rem;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
    }

    .footer-brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 4rem 0;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--white);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        box-shadow: var(--shadow-md);
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .lang-toggle {
        margin-left: auto;
        margin-right: 1rem;
    }

    .hero {
        text-align: center;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-buttons {
        justify-content: center;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

    .contact-form {
        padding: 1.5rem;
    }
}