/* 
  怀化地方服饰文化网站 - 核心样式表
  Theme: Mountain & Indigo
*/

/* --- 1. Variables --- */
:root {
    --primary: #1A237E;      /* 深靛蓝 */
    --primary-light: #534bae;
    --secondary: #F5F5F0;    /* 米白底色 */
    --accent: #B71C1C;       /* 绛红点缀 */
    --text-main: #212121;    /* 墨黑正文 */
    --text-muted: #757575;   /* 浅灰辅助 */
    --border: #E0E0E0;
    --white: #FFFFFF;
    
    --font-display: 'Noto Serif SC', serif;
    --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    
    --radius: 8px;
    --transition: all 0.3s ease;
}

/* --- 2. Reset & Base --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    background-color: var(--secondary);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    color: var(--primary);
    font-weight: 700;
    line-height: 1.2;
}

/* --- 3. Layout Utilities --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 60px 0;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: 1rem; }
.gap-8 { gap: 2rem; }

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

.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-muted { color: var(--text-muted); }

.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-16 { margin-bottom: 4rem; }

/* --- 4. Components --- */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-light);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-ghost {
    background-color: transparent;
    color: var(--text-muted);
}

.btn-ghost:hover {
    color: var(--primary);
    background-color: rgba(26, 35, 126, 0.05);
}

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid transparent;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(26, 35, 126, 0.1);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    display: flex;
    align-items: center;
}

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

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
    position: relative;
    padding: 5px 0;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary);
}

/* Footer */
.footer {
    background-color: #EFEFEF;
    padding: 60px 0 30px;
    margin-top: auto;
    border-top: 1px solid var(--border);
    text-align: center;
}

/* --- 5. Page Specific --- */

/* Hero Section */
.hero {
    position: relative;
    height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    color: var(--white);
    text-align: center;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1;
    filter: brightness(0.6);
}

.hero-content {
    max-width: 800px;
    padding: 20px;
    z-index: 1;
}

.hero-title {
    font-size: 4rem;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    opacity: 0.9;
    margin-bottom: 2rem;
}

/* Gallery Grid */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.gallery-item {
    position: relative;
}

.gallery-img-container {
    position: relative;
    padding-bottom: 133%; /* 3:4 aspect ratio */
    overflow: hidden;
    border-radius: var(--radius);
}

.gallery-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

/* Detail Page */
.detail-hero {
    height: 50vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.detail-hero-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.detail-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.4);
}

.detail-content {
    background: var(--white);
    border-radius: 20px 20px 0 0;
    padding: 60px 40px;
    margin-top: -60px;
    position: relative;
    z-index: 10;
    box-shadow: 0 -10px 30px rgba(0,0,0,0.1);
    min-height: 500px;
}

.tag-badge {
    display: inline-block;
    background: rgba(26, 35, 126, 0.1);
    color: var(--primary);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin: 0 5px;
}

/* --- 6. Responsive --- */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* Mobile menu logic needed if pure CSS, or just stack them */
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .grid-cols-2, .grid-cols-3 {
        grid-template-columns: 1fr;
    }
    
    .detail-content {
        padding: 40px 20px;
    }
}