/* 
 * File: fashion-vision-170617/frontend/public/css/style.css
 * Description: Global styles for Fashion Vision website focusing on minimalist, high-end aesthetics.
 */

/* =========================================
   1. Variables & Design Tokens
   ========================================= */
:root {
    /* Color Palette */
    --color-bg-body: #faf9f6;       /* 奶油白/米白背景 */
    --color-bg-white: #ffffff;
    --color-text-primary: #2c2c2c;  /* 深炭灰，比纯黑更柔和 */
    --color-text-secondary: #6e6e6e;
    --color-accent: #a89f91;        /* 灰褐/驼色，中性高级感 */
    --color-accent-hover: #8d8579;
    --color-gold: #c5a059;          /* 香槟金点缀 */
    --color-border: #e6e6e6;
    
    /* Typography */
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Noto Sans SC', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    
    /* Layout */
    --container-width: 1200px;
    --header-height: 80px;
    
    /* Effects */
    --transition-base: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --shadow-subtle: 0 10px 30px rgba(0, 0, 0, 0.03);
}

/* =========================================
   2. Reset & Base Styles
   ========================================= */
*, *::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-body);
    color: var(--color-text-primary);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

/* =========================================
   3. Typography
   ========================================= */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 400;
    line-height: 1.3;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 3.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2.5rem; letter-spacing: 0.02em; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase; }

p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-weight: 300;
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-justify { text-align: justify; }

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
    padding-bottom: var(--spacing-md);
}

.section-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background-color: var(--color-accent);
}

.section-subtitle {
    font-family: var(--font-body);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
    display: block;
}

/* =========================================
   4. Layout Components
   ========================================= */
.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

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

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

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

/* =========================================
   5. Components
   ========================================= */

/* Navigation */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(250, 249, 246, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(0,0,0,0.03);
    transition: var(--transition-base);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo a {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--color-text-primary);
}

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

.nav-menu a {
    font-size: 0.95rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    position: relative;
    padding-bottom: 5px;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-accent);
    transition: width 0.3s ease;
}

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

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    background: none;
    border: none;
    color: var(--color-text-primary);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border: 1px solid var(--color-text-primary);
    background: transparent;
    color: var(--color-text-primary);
    font-family: var(--font-body);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.2em;
    cursor: pointer;
    transition: var(--transition-base);
    margin-top: var(--spacing-sm);
}

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

.read-more {
    font-size: 0.9rem;
    color: var(--color-text-primary);
    border-bottom: 1px solid var(--color-accent);
    padding-bottom: 2px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-style: italic;
    font-family: var(--font-heading);
}

.read-more:hover {
    color: var(--color-accent);
    border-color: transparent;
}

/* Hero Section */
.hero-section {
    height: 100vh;
    position: relative;
    overflow: hidden;
}

.hero-slider, .slide {
    height: 100%;
    width: 100%;
    position: relative;
}

.slide-image {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    transition: transform 10s ease; /* Slow zoom effect */
}

.slide.active .slide-image {
    transform: scale(1.05);
}

.slide-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.2); /* Light overlay for text contrast */
}

.slide-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--color-bg-white);
    z-index: 2;
    width: 90%;
    max-width: 800px;
}

.slide-content h1 {
    color: var(--color-bg-white);
    margin-bottom: var(--spacing-md);
    font-size: 4rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.slide-content p {
    color: rgba(255,255,255,0.9);
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
}

.slide-content .btn {
    border-color: var(--color-bg-white);
    color: var(--color-bg-white);
}

.slide-content .btn:hover {
    background: var(--color-bg-white);
    color: var(--color-text-primary);
}

/* Cards & Articles */
.featured-item {
    display: flex;
    flex-direction: column;
    margin-bottom: var(--spacing-xl);
}

.featured-item:nth-child(even) {
    flex-direction: column; /* Mobile default */
}

.featured-image {
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-subtle);
}

.featured-image img {
    transition: transform 0.6s ease;
    width: 100%;
}

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

.meta {
    font-size: 0.8rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: var(--spacing-xs);
    display: block;
}

/* Quote Cards */
.quote-card {
    background: var(--color-bg-white);
    padding: var(--spacing-md);
    text-align: center;
    border: 1px solid var(--color-border);
    transition: var(--transition-base);
}

.quote-card:hover {
    border-color: var(--color-gold);
    transform: translateY(-5px);
}

.quote-card p {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-style: italic;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.quote-card cite {
    font-size: 0.9rem;
    font-style: normal;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
}

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

.footer-content p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.1em;
}

/* =========================================
   6. Page Specific Styles
   ========================================= */

/* Style Guide Page */
.color-palette {
    display: flex;
    gap: var(--spacing-sm);
    margin: var(--spacing-sm) 0;
}

.color-swatch {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 1px solid rgba(0,0,0,0.1);
}

/* Trends Page */
.trend-card {
    position: relative;
    margin-bottom: var(--spacing-md);
}

.trend-number {
    font-family: var(--font-heading);
    font-size: 4rem;
    color: rgba(0,0,0,0.05);
    position: absolute;
    top: -2rem;
    left: -1rem;
    z-index: -1;
}

/* =========================================
   7. Responsive Design
   ========================================= */
@media (min-width: 768px) {
    .featured-item {
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-lg);
    }

    .featured-item:nth-child(even) {
        flex-direction: row-reverse;
    }

    .featured-image {
        flex: 1;
        margin-bottom: 0;
    }

    .featured-content {
        flex: 1;
        padding: 0 var(--spacing-md);
    }
}

@media (max-width: 992px) {
    :root {
        --spacing-xl: 5rem;
    }
    h1 { font-size: 2.8rem; }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background: var(--color-bg-white);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        transform: translateX(100%);
        transition: transform 0.4s ease;
        padding-bottom: var(--spacing-xl);
    }

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

    .nav-menu li {
        margin: var(--spacing-sm) 0;
    }
    
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .slide-content h1 {
        font-size: 2.5rem;
    }
    
    .section-padding {
        padding: var(--spacing-lg) 0;
    }
}