/* ===================================
   CSS Variables & Design Tokens
   =================================== */
:root {
    /* Color Palette - Inspired by traditional Chinese aesthetics */
    --color-primary: hsl(0, 75%, 45%);
    --color-primary-light: hsl(0, 75%, 55%);
    --color-primary-dark: hsl(0, 75%, 35%);
    --color-secondary: hsl(38, 85%, 55%);
    --color-accent: hsl(25, 90%, 60%);

    --color-bg-primary: hsl(0, 0%, 98%);
    --color-bg-secondary: hsl(0, 0%, 95%);
    --color-bg-dark: hsl(0, 5%, 10%);
    --color-bg-card: hsl(0, 0%, 100%);

    --color-text-primary: hsl(0, 5%, 15%);
    --color-text-secondary: hsl(0, 5%, 40%);
    --color-text-light: hsl(0, 0%, 95%);

    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    --gradient-gold: linear-gradient(135deg, hsl(38, 85%, 55%) 0%, hsl(45, 90%, 65%) 100%);
    --gradient-overlay: linear-gradient(180deg, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.7) 100%);

    /* Typography */
    --font-serif: 'Noto Serif SC', serif;
    --font-sans: 'Noto Sans SC', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.2);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Z-index */
    --z-modal: 1000;
    --z-navbar: 100;
    --z-overlay: 50;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

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

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

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
    transition: var(--transition-base);
}

ul {
    list-style: none;
}

/* ===================================
   Utility Classes
   =================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.section-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--gradient-gold);
    color: var(--color-text-primary);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: var(--z-navbar);
    transition: var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
}

.logo-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 1.25rem;
}

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

.nav-menu {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
}

.nav-link:hover {
    color: var(--color-primary);
    background: rgba(0, 0, 0, 0.05);
}

.nav-link.cta-button {
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
}

.nav-link.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--color-text-primary);
    border-radius: 2px;
    transition: var(--transition-base);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-top: 70px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg,
            hsl(0, 75%, 45%) 0%,
            hsl(25, 90%, 60%) 50%,
            hsl(38, 85%, 55%) 100%);
    opacity: 0.1;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.15) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: var(--spacing-md);
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.title-line {
    display: block;
    animation: fadeInUp 0.8s ease forwards;
    opacity: 0;
}

.title-line:nth-child(1) {
    animation-delay: 0.2s;
}

.title-line:nth-child(2) {
    animation-delay: 0.4s;
}

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

.hero-subtitle {
    font-size: clamp(1rem, 3vw, 1.5rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease 0.6s forwards;
    opacity: 0;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.8s forwards;
    opacity: 0;
}

.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition-base);
    display: inline-block;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: white;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-left: 2px solid var(--color-text-secondary);
    border-bottom: 2px solid var(--color-text-secondary);
    transform: rotate(-45deg);
    margin: var(--spacing-xs) auto 0;
}

/* ===================================
   History Section
   =================================== */
.history-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-bg-primary);
}

.history-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.story-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition-base);
    aspect-ratio: 4/3;
}

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

.story-image {
    position: relative;
    width: 100%;
    height: 100%;
}

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

.story-card:hover .story-image img {
    transform: scale(1.1);
}

.story-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-md);
    background: var(--gradient-overlay);
    color: white;
    transform: translateY(0);
    transition: var(--transition-base);
}

.story-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
    display: block;
}

.story-overlay h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
}

/* ===================================
   Products Section
   =================================== */
.products-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-bg-secondary);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.product-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
}

.product-card:hover {
    transform: translateY(-8px) rotateY(2deg);
    box-shadow: var(--shadow-xl);
}

.product-gallery {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
}

.product-images {
    position: relative;
    width: 100%;
    height: 100%;
}

.product-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.product-img.active {
    opacity: 1;
}

.gallery-dots {
    position: absolute;
    bottom: var(--spacing-sm);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-xs);
    z-index: 10;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: var(--transition-fast);
}

.dot.active {
    background: white;
    width: 24px;
    border-radius: var(--radius-full);
}

.product-info {
    padding: var(--spacing-md);
    text-align: center;
}

.product-name {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.product-tagline {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.btn-learn-more {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: var(--transition-base);
}

.btn-learn-more:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===================================
   Testimonials Section
   =================================== */
.testimonials-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-bg-primary);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.testimonial-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition-base);
    aspect-ratio: 3/4;
}

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

.testimonial-image {
    position: relative;
    width: 100%;
    height: 100%;
}

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

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

.testimonial-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-md);
    background: var(--gradient-overlay);
    color: white;
}

.testimonial-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
    display: block;
}

.testimonial-overlay h3 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.testimonial-preview {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* ===================================
   Contact Section
   =================================== */
.contact-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-bg-dark);
    color: var(--color-text-light);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.contact-info h2 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-sm);
}

.contact-subtitle {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-lg);
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(8px);
}

.contact-icon {
    font-size: 2rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.contact-details h4 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.contact-details p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.contact-link {
    color: var(--color-secondary);
    font-weight: 600;
    font-size: 1.125rem;
}

.contact-link:hover {
    color: var(--color-accent);
}

.btn-show-qr,
.btn-contact {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--gradient-gold);
    color: var(--color-text-primary);
    border-radius: var(--radius-sm);
    font-weight: 600;
    margin-top: var(--spacing-xs);
}

.btn-show-qr:hover,
.btn-contact:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.contact-item.btn-reveal {
    cursor: pointer;
    transition: var(--transition-base);
}

.contact-item.btn-reveal:hover {
    background: rgba(255, 255, 255, 0.1);
}

.contact-item.btn-reveal.active {
    background: var(--gradient-primary);
    box-shadow: var(--shadow-lg);
}

.contact-item.btn-reveal.active .contact-icon {
    background: white;
    color: var(--color-primary);
}

.btn-action {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: white;
    color: var(--color-text-primary);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    margin-top: var(--spacing-xs);
}

.contact-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.display-placeholder {
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    border: 2px dashed rgba(255, 255, 255, 0.2);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 320px;
}

.placeholder-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.3;
}

.qr-display,
.phone-display {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    text-align: center;
    max-width: 320px;
    width: 100%;
    color: var(--color-text-primary);
}

.qr-main-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.phone-icon-large {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.revealed-number {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.animate-in {
    animation: fadeInUp 0.5s ease forwards;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--color-bg-dark);
    color: var(--color-text-light);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    margin-top: var(--spacing-sm);
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.footer-column h4 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.125rem;
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
}

.footer-column a:hover {
    color: white;
}

.footer-column li {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

/* ===================================
   Modals
   =================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--z-modal);
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    background: white;
    border-radius: var(--radius-lg);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease;
}

.modal-small {
    max-width: 400px;
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.1);
    color: var(--color-text-primary);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: var(--transition-base);
}

.modal-close:hover {
    background: rgba(0, 0, 0, 0.2);
    transform: rotate(90deg);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-body h2 {
    font-family: var(--font-serif);
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.modal-body h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    margin: var(--spacing-md) 0 var(--spacing-sm);
}

.modal-body p {
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

.modal-body ul {
    list-style: disc;
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.modal-body li {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-secondary);
}

.qr-modal-body {
    text-align: center;
}

.qr-modal-body img {
    margin: 0 auto var(--spacing-md);
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    40% {
        transform: translateX(-50%) translateY(-10px);
    }

    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        padding: var(--spacing-md);
        transition: var(--transition-base);
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .hero {
        margin-top: 70px;
    }

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

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

    .contact-visual {
        order: -1;
    }

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

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

    .modal-content {
        margin: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

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

    .btn {
        width: 100%;
    }
}