/* ============================================
   CHANG FA SUPERMARKET — DESIGN SYSTEM
   Bold Editorial | Emerald & Cream
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --color-emerald-900: #064e3b;
    --color-emerald-800: #065f46;
    --color-emerald-700: #047857;
    --color-emerald-600: #059669;
    --color-emerald-500: #10b981;
    --color-cream-50: #faf9f6;
    --color-cream-100: #f5f4f0;
    --color-cream-200: #ebe9e3;
    --color-cream-300: #e0ded7;
    --color-dark: #1a1a18;
    --color-dark-soft: #2d2d2a;
    --color-text: #3a3a36;
    --color-text-light: #6b6b64;
    --color-white: #ffffff;
    
    --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --space-3xl: 8rem;
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.06);
    --shadow-xl: 0 24px 60px rgba(0,0,0,0.15), 0 8px 20px rgba(0,0,0,0.08);
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-cream-50);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* --- Typography --- */
.section-label {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-emerald-700);
    margin-bottom: var(--space-sm);
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    line-height: 1.15;
    color: var(--color-dark);
    margin-bottom: var(--space-md);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 560px;
    line-height: 1.7;
}

/* --- Buttons --- */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-white);
    background: var(--color-emerald-700);
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    border: 2px solid var(--color-emerald-700);
}

.btn-primary:hover {
    background: var(--color-emerald-800);
    border-color: var(--color-emerald-800);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-dark);
    background: transparent;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-xl);
    border: 2px solid var(--color-cream-300);
    transition: all var(--transition-base);
}

.btn-secondary:hover {
    border-color: var(--color-emerald-700);
    color: var(--color-emerald-700);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* --- Navigation --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md) 0;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(250, 249, 246, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(0,0,0,0.06);
    padding: var(--space-sm) 0;
}

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

.logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-white);
    transition: color var(--transition-base);
    letter-spacing: -0.02em;
}

.navbar.scrolled .logo {
    color: var(--color-dark);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-links a {
    font-size: 0.9375rem;
    font-weight: 400;
    color: rgba(255,255,255,0.85);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--color-emerald-500);
    transition: width var(--transition-base);
}

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

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

.navbar.scrolled .nav-links a {
    color: var(--color-text-light);
}

.navbar.scrolled .nav-links a:hover {
    color: var(--color-emerald-700);
}

.nav-links .btn-primary {
    padding: 0.625rem 1.375rem;
    font-size: 0.875rem;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    color: var(--color-white);
    padding: var(--space-xs);
    transition: color var(--transition-base);
}

.navbar.scrolled .mobile-menu-btn {
    color: var(--color-dark);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    inset: 0;
    z-index: 999;
    background: var(--color-cream-50);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-menu-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    color: var(--color-dark);
    padding: var(--space-xs);
}

.mobile-menu-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.mobile-link {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    color: var(--color-dark);
    transition: color var(--transition-fast);
}

.mobile-link:hover {
    color: var(--color-emerald-700);
}

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

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.gradient-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(6, 78, 59, 0.82) 0%,
        rgba(4, 120, 87, 0.65) 40%,
        rgba(5, 150, 105, 0.45) 70%,
        rgba(16, 185, 129, 0.25) 100%
    );
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 820px;
    padding-top: var(--space-3xl);
    padding-bottom: var(--space-3xl);
}

.hero-headline {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.08;
    color: var(--color-white);
    margin-bottom: var(--space-md);
    letter-spacing: -0.02em;
}

.hero-headline em {
    font-style: italic;
    color: var(--color-emerald-300);
}

.hero-subtitle {
    font-size: clamp(1rem, 1.5vw, 1.25rem);
    color: rgba(255,255,255,0.85);
    max-width: 580px;
    margin: 0 auto var(--space-xl);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.hero-actions .btn-primary {
    background: var(--color-white);
    color: var(--color-emerald-800);
    border-color: var(--color-white);
}

.hero-actions .btn-primary:hover {
    background: var(--color-cream-100);
    border-color: var(--color-cream-100);
}

.hero-actions .btn-secondary {
    border-color: rgba(255,255,255,0.4);
    color: var(--color-white);
}

.hero-actions .btn-secondary:hover {
    border-color: var(--color-white);
    color: var(--color-white);
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255,255,255,0.6);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    animation: float 2.5s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* --- About Section --- */
.about {
    padding: var(--space-3xl) 0;
    background: var(--color-cream-50);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.about-image-wrapper {
    position: relative;
}

.about-image {
    width: 100%;
    height: 500px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.about-image-accent {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 200px;
    height: 200px;
    background: var(--color-emerald-700);
    border-radius: var(--radius-lg);
    z-index: -1;
    opacity: 0.15;
}

.about-content {
    padding: var(--space-md) 0;
}

.about-content p {
    font-size: 1.0625rem;
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.about-features {
    display: flex;
    gap: var(--space-lg);
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-cream-200);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-dark);
}

.feature-item svg {
    color: var(--color-emerald-700);
}

/* --- Products Section --- */
.products {
    padding: var(--space-3xl) 0;
    background: var(--color-white);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.section-header .section-subtitle {
    margin: 0 auto;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.product-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: var(--color-cream-50);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.product-image {
    height: 100%;
    min-height: 280px;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-info {
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.product-info h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-sm);
}

.product-info p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* --- Experience Banner --- */
.experience-banner {
    padding: var(--space-3xl) 0;
    background: var(--color-emerald-800);
    position: relative;
    overflow: hidden;
}

.experience-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(16,185,129,0.3) 0%, transparent 70%);
    border-radius: 50%;
}

.experience-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.experience-headline {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 3.5vw, 2.75rem);
    font-weight: 600;
    color: var(--color-white);
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

.experience-content p {
    font-size: 1.125rem;
    color: rgba(255,255,255,0.75);
    line-height: 1.8;
}

/* --- Location Section --- */
.location {
    padding: var(--space-3xl) 0;
    background: var(--color-cream-50);
}

.location-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: stretch;
}

.location-info {
    padding: var(--space-xl);
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.location-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    margin: var(--space-xl) 0;
}

.detail-item {
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
}

.detail-item svg {
    color: var(--color-emerald-700);
    flex-shrink: 0;
    margin-top: 0.125rem;
}

.detail-item strong {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 0.25rem;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.detail-item p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

.location-map {
    border-radius: var(--radius-lg);
    overflow: hidden;
    min-height: 450px;
    box-shadow: var(--shadow-md);
}

/* --- Contact Section --- */
.contact {
    padding: var(--space-3xl) 0;
    background: var(--color-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: start;
}

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

.contact-info p {
    font-size: 1.0625rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.contact-method {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-dark);
    transition: color var(--transition-fast);
}

.contact-method:hover {
    color: var(--color-emerald-700);
}

.contact-method svg {
    color: var(--color-emerald-700);
}

/* Contact Form */
.contact-form-wrapper {
    background: var(--color-cream-50);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}

.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-dark);
    margin-bottom: 0.5rem;
    letter-spacing: 0.02em;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    color: var(--color-dark);
    background: var(--color-white);
    border: 1.5px solid var(--color-cream-200);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-emerald-600);
    box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-light);
}

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

.form-success {
    display: none;
    align-items: center;
    gap: 0.5rem;
    padding: var(--space-md);
    background: rgba(5, 150, 105, 0.08);
    border-radius: var(--radius-sm);
    color: var(--color-emerald-700);
    font-size: 0.9375rem;
    font-weight: 500;
    margin-top: var(--space-md);
}

.form-success.show {
    display: flex;
}

.form-success svg {
    flex-shrink: 0;
}

/* --- Footer --- */
.footer {
    padding: var(--space-2xl) 0 var(--space-lg);
    background: var(--color-dark);
    color: rgba(255,255,255,0.7);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer-logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--space-sm);
}

.footer-brand p {
    font-size: 0.9375rem;
    line-height: 1.7;
    max-width: 300px;
}

.footer-links h4,
.footer-hours h4 {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.4);
    margin-bottom: var(--space-md);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.footer-links a {
    font-size: 0.9375rem;
    color: rgba(255,255,255,0.7);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-emerald-400);
}

.footer-hours p {
    font-size: 0.9375rem;
    margin-bottom: 0.375rem;
}

.footer-bottom {
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255,255,255,0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.footer-bottom p {
    font-size: 0.8125rem;
    color: rgba(255,255,255,0.4);
}

/* --- Scroll Animations --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* --- Responsive --- */
@media (max-width: 1024px) {
    .about-grid,
    .location-grid,
    .contact-grid {
        gap: var(--space-xl);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

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

    .hero-content {
        padding-top: var(--space-2xl);
    }

    .hero-headline {
        font-size: clamp(2rem, 8vw, 3rem);
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .hero-actions .btn-primary,
    .hero-actions .btn-secondary {
        width: 100%;
        justify-content: center;
    }

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

    .about-image {
        height: 350px;
    }

    .about-image-accent {
        width: 120px;
        height: 120px;
        bottom: -10px;
        right: -10px;
    }

    .about-features {
        flex-direction: column;
        gap: var(--space-sm);
    }

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

    .product-card {
        grid-template-columns: 1fr;
    }

    .product-image {
        min-height: 220px;
    }

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

    .location-map {
        min-height: 300px;
    }

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-sm);
    }

    .hero-headline {
        font-size: clamp(1.75rem, 9vw, 2.5rem);
    }

    .section-title {
        font-size: clamp(1.5rem, 6vw, 2rem);
    }

    .product-info {
        padding: var(--space-md);
    }

    .contact-form-wrapper {
        padding: var(--space-md);
    }
}