/* 
 * Project: 衣着美学 (Fashion Aesthetics)
 * Description: Global Stylesheet implementing Minimalist Design
 * Author: HAISNAP
 * Date: 2025
 */

/* ==========================================================================
   1. Variables & Design Tokens
   ========================================================================== */
:root {
    /* Color System */
    --color-bg-primary: #FFFFFF;       /* 纯白 */
    --color-bg-secondary: #F8F9FA;     /* 浅灰 */
    --color-bg-accent: #F5F5F0;        /* 浅米色 */
    --color-text-primary: #2C2C2C;     /* 深灰 */
    --color-text-secondary: #666666;   /* 中灰 */
    --color-accent: #9C786C;           /* 陶土色 */
    --color-border: #E5E5E5;
    
    /* Typography */
    --font-primary: 'Noto Sans SC', 'Source Han Sans CN', sans-serif; /* 思源黑体 */
    --font-secondary: 'Inter', 'Helvetica Neue', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    
    /* Layout */
    --container-width: 1440px;
    --header-height: 80px;
    
    /* Transitions */
    --transition-base: all 0.3s ease-in-out;
    --transition-slow: all 0.6s ease-in-out;
}

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

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

body {
    font-family: var(--font-primary);
    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;
    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-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 36px); }
h2 { font-size: clamp(1.5rem, 4vw, 28px); }
h3 { font-size: clamp(1.2rem, 3vw, 22px); }

p {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 400;
}

.text-en {
    font-family: var(--font-secondary);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

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

.section {
    padding: var(--spacing-lg) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Flex Helpers */
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-column { flex-direction: column; }

/* ==========================================================================
   5. Navigation
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid transparent;
    transition: var(--transition-base);
}

.navbar.scrolled {
    border-bottom: 1px solid var(--color-border);
    height: 70px;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--color-text-primary);
}

.nav-menu {
    display: flex;
    gap: 3rem;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
}

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

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

/* Mobile Menu Toggle */
.hamburger {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0.5rem;
}

.bar {
    display: block;
    width: 25px;
    height: 2px;
    margin: 5px auto;
    background-color: var(--color-text-primary);
    transition: var(--transition-base);
}

/* ==========================================================================
   6. Hero Section (Slider)
   ========================================================================== */
.hero {
    height: 100vh;
    width: 100%;
    position: relative;
    overflow: hidden;
    margin-top: 0; /* Override default section spacing */
}

.slider {
    height: 100%;
    width: 100%;
    position: relative;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
    z-index: 1;
}

.slide.active {
    opacity: 1;
    z-index: 2;
}

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

.hero-content {
    position: absolute;
    bottom: 15%;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    text-align: center;
    color: #FFFFFF;
    text-shadow: 0 2px 10px rgba(0,0,0,0.1);
    width: 90%;
    max-width: 800px;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: 1rem;
    font-weight: 300;
    letter-spacing: 0.05em;
}

.hero-subtitle {
    font-size: 1.1rem;
    font-weight: 300;
    opacity: 0.9;
    letter-spacing: 0.1em;
}

/* ==========================================================================
   7. Content Components
   ========================================================================== */
/* Cards */
.card {
    position: relative;
    overflow: hidden;
    background: var(--color-bg-primary);
    transition: var(--transition-base);
}

.card-image {
    width: 100%;
    aspect-ratio: 3/4;
    overflow: hidden;
    position: relative;
}

.card-image img {
    width: 100%;
    height: 100%;
    transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

.card-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem;
    background: linear-gradient(to top, rgba(0,0,0,0.4), transparent);
    opacity: 0;
    transition: var(--transition-base);
    color: #FFF;
}

.card:hover .card-overlay {
    opacity: 1;
}

.card-info {
    padding: 1.2rem 0;
}

.card-title {
    font-size: 1.1rem;
    margin-bottom: 0.4rem;
    font-weight: 500;
}

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

/* Buttons */
.btn-minimal {
    display: inline-block;
    padding: 0.8rem 2rem;
    border: 1px solid var(--color-text-primary);
    background: transparent;
    color: var(--color-text-primary);
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    transition: var(--transition-base);
    cursor: pointer;
}

.btn-minimal:hover {
    background: var(--color-text-primary);
    color: #FFF;
}

/* Inspiration Layout (Masonry-like) */
.inspiration-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    grid-auto-flow: dense;
}

.inspiration-item.large {
    grid-column: span 2;
    grid-row: span 2;
}

.inspiration-item.tall {
    grid-row: span 2;
}

/* ==========================================================================
   8. Lightbox
   ========================================================================== */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.98);
    z-index: 2000;
    display: none;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lightbox.active {
    display: flex;
    opacity: 1;
}

.lightbox-content {
    max-width: 90%;
    max-height: 85vh;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.lightbox-close {
    position: absolute;
    top: 2rem;
    right: 2rem;
    font-size: 2rem;
    cursor: pointer;
    color: var(--color-text-primary);
    background: none;
    border: none;
}

/* ==========================================================================
   9. Footer
   ========================================================================== */
.site-footer {
    background-color: var(--color-bg-secondary);
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-lg);
}

.copyright {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    font-family: var(--font-secondary);
    letter-spacing: 0.05em;
}

/* ==========================================================================
   10. Animations
   ========================================================================== */
.fade-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   11. Responsive Design
   ========================================================================== */
@media (max-width: 1024px) {
    :root {
        --spacing-lg: 3rem;
    }
    
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
        --spacing-md: 1.5rem;
    }
    
    .hamburger {
        display: block;
        z-index: 1002;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: #FFF;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: var(--transition-base);
        box-shadow: -5px 0 15px rgba(0,0,0,0.05);
        gap: 2rem;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .inspiration-item.large {
        grid-column: auto;
        grid-row: auto;
    }
    
    .hero-content {
        width: 95%;
    }
    
    .card-image {
        aspect-ratio: 1/1; /* Square images on mobile */
    }
}