/* 
 * 时尚韵律 · 优雅时刻
 * Global Stylesheet
 * Design Philosophy: Minimalist, Modern, Elegant
 */

/* =========================================
   1. Variables & Reset
   ========================================= */
:root {
    /* Color Palette */
    --color-bg-primary: #FFFFFF;
    --color-bg-secondary: #FAFAFA;
    --color-bg-accent: #F5F1EA;
    --color-text-primary: #333333;
    --color-text-secondary: #666666;
    --color-text-light: #999999;
    --color-border: #E8E3DB;
    --color-accent-dark: #2C2C2C;
    --color-link-hover: #A78A7F;

    /* Typography */
    --font-heading: "Playfair Display", "Source Han Serif CN", "Songti SC", serif;
    --font-body: "Source Han Sans CN", "Helvetica Neue", Helvetica, Arial, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* Transitions */
    --transition-fast: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-smooth: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

/* =========================================
   2. Typography
   ========================================= */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 400;
    line-height: 1.2;
    color: var(--color-text-primary);
}

.heading-xl {
    font-size: 3rem;
    letter-spacing: -0.02em;
}

.heading-lg {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.heading-md {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.text-caption {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.text-body-lg {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 60ch;
}

.text-center { text-align: center; }
.text-serif { font-family: var(--font-heading); }

/* =========================================
   3. Layout Utilities
   ========================================= */
.container {
    width: 90%;
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.section-bg-alt {
    background-color: var(--color-bg-secondary);
}

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

/* =========================================
   4. Header & Navigation
   ========================================= */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-fast);
}

.site-header.scrolled {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-bottom-color: var(--color-border);
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--color-text-primary);
}

.main-nav ul {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    position: relative;
    padding-bottom: 4px;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-text-primary);
    transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
    font-size: 1.5rem;
}

/* =========================================
   5. Hero Section (Home)
   ========================================= */
.hero-slider {
    position: relative;
    height: 100vh;
    width: 100%;
    overflow: hidden;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.slide.active {
    opacity: 1;
}

.slide::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.1); /* Subtle overlay */
}

.hero-content {
    position: relative;
    z-index: 10;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #fff;
    text-align: center;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s 0.5s, transform 1s 0.5s;
}

.slide.active .hero-content {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================
   6. Featured Collections (Home)
   ========================================= */
.featured-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.collection-card {
    position: relative;
    overflow: hidden;
    aspect-ratio: 1;
    cursor: pointer;
}

.card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-smooth);
}

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

.card-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-md);
    background: linear-gradient(to top, rgba(0,0,0,0.4), transparent);
    color: white;
    transform: translateY(10px);
    opacity: 0.9;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.collection-card:hover .card-overlay {
    transform: translateY(0);
    opacity: 1;
}

.card-title {
    font-size: 1.25rem;
    font-family: var(--font-heading);
    margin-bottom: var(--spacing-xs);
}

.card-link {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-bottom: 1px solid rgba(255,255,255,0.6);
}

/* =========================================
   7. Quote Section
   ========================================= */
.quote-section {
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
    background-color: var(--color-bg-accent);
}

.quote-text {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-style: italic;
    color: var(--color-text-primary);
    max-width: 800px;
    margin: 0 auto;
}

/* =========================================
   8. Collections Page
   ========================================= */
.filter-nav {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.filter-btn {
    background: none;
    border: none;
    font-family: var(--font-body);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    color: var(--color-text-primary);
    font-weight: 500;
}

.collections-gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg) var(--spacing-md);
}

.product-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    opacity: 0;
    animation: fadeIn 0.8s ease forwards;
}

.product-image-wrap {
    overflow: hidden;
    position: relative;
    aspect-ratio: 3/4;
}

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

.product-image-wrap:hover img {
    transform: scale(1.03);
}

.product-info {
    text-align: center;
}

.product-name {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.product-desc {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.visual-break {
    width: 100%;
    height: 60vh;
    margin: var(--spacing-xl) 0;
    overflow: hidden;
}

.visual-break img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.pairing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* =========================================
   9. Philosophy Page
   ========================================= */
.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.concept-item {
    text-align: center;
    padding: var(--spacing-md);
}

.concept-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
    opacity: 0.8;
}

.details-slider-section {
    position: relative;
    padding: var(--spacing-xl) 0;
}

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

.detail-text h3 {
    margin-bottom: var(--spacing-sm);
}

.visual-story {
    position: relative;
    height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.visual-story-content {
    background: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-lg);
    text-align: center;
    backdrop-filter: blur(5px);
}

/* =========================================
   10. Footer
   ========================================= */
.site-footer {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-xl);
    text-align: center;
}

.footer-content p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    font-family: var(--font-heading);
    letter-spacing: 0.1em;
}

/* =========================================
   11. Animations
   ========================================= */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* =========================================
   12. Responsive Design
   ========================================= */
@media (max-width: 1024px) {
    .heading-xl { font-size: 2.5rem; }
    .featured-grid, .collections-gallery, .pairing-grid, .philosophy-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .details-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .site-header { padding: var(--spacing-sm) var(--spacing-md); }
    
    .mobile-menu-toggle { display: block; z-index: 1001; }
    
    .main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background-color: white;
        padding-top: var(--spacing-xl);
        transition: right var(--transition-fast);
        box-shadow: -5px 0 15px rgba(0,0,0,0.1);
    }
    
    .main-nav.active { right: 0; }
    
    .main-nav ul {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
    }
    
    .heading-xl { font-size: 2rem; }
    .featured-grid, .collections-gallery, .pairing-grid, .philosophy-grid {
        grid-template-columns: 1fr;
    }
    
    .container { width: 92%; padding: 0 var(--spacing-sm); }
    
    .quote-text { font-size: 1.5rem; }
}