/* ========================================
   ARN Galleries - 高端艺术画廊官网样式
   收纳箱极简风 | 浅灰 + 纯白 + 哑光黑
   ======================================== */

/* CSS Reset & 基础变量 */
:root {
    --color-white: #ffffff;
    --color-light-gray: #f5f5f5;
    --color-medium-gray: #e0e0e0;
    --color-dark-gray: #9e9e9e;
    --color-matte-black: #1a1a1a;
    --color-deep-black: #0d0d0d;
    
    --font-primary: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-secondary: 'Georgia', serif;
    
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 32px;
    --spacing-lg: 64px;
    --spacing-xl: 120px;
    
    --transition-smooth: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-fast: all 0.2s ease;
}

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

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

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

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

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

ul {
    list-style: none;
}

/* ========================================
   顶部导航栏
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: var(--transition-smooth);
    padding: var(--spacing-md) var(--spacing-lg);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
    padding: var(--spacing-sm) var(--spacing-lg);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1600px;
    margin: 0 auto;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--color-matte-black);
    text-transform: uppercase;
}

.logo span {
    color: var(--color-dark-gray);
}

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

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 1px;
    color: var(--color-matte-black);
    position: relative;
    padding: 8px 0;
}

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

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--color-matte-black);
    transition: var(--transition-fast);
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--color-matte-black);
    color: var(--color-white);
    padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
}

.footer-inner {
    max-width: 1600px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.footer-section h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    letter-spacing: 1px;
}

.footer-section p,
.footer-section a {
    font-size: 0.9rem;
    color: var(--color-dark-gray);
    line-height: 2;
}

.footer-section a:hover {
    color: var(--color-white);
}

.footer-bottom {
    max-width: 1600px;
    margin: var(--spacing-lg) auto 0;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-dark-gray);
}

/* ========================================
   通用动画
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ========================================
   首页 Hero 区块
   ======================================== */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, var(--color-light-gray) 0%, var(--color-white) 100%);
    overflow: hidden;
}

.hero-content {
    text-align: center;
    z-index: 2;
    padding: 0 var(--spacing-md);
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 300;
    letter-spacing: 8px;
    color: var(--color-matte-black);
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 1s ease forwards;
}

.hero-subtitle {
    font-size: 1.2rem;
    font-weight: 300;
    color: var(--color-dark-gray);
    letter-spacing: 2px;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 1s ease 0.3s forwards;
    opacity: 0;
}

.hero-btn {
    display: inline-block;
    padding: 16px 48px;
    border: 1px solid var(--color-matte-black);
    color: var(--color-matte-black);
    font-size: 0.9rem;
    letter-spacing: 2px;
    transition: var(--transition-smooth);
    animation: fadeInUp 1s ease 0.6s forwards;
    opacity: 0;
}

.hero-btn:hover {
    background: var(--color-matte-black);
    color: var(--color-white);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   阶梯布局区块
   ======================================== */
.section {
    padding: var(--spacing-xl) var(--spacing-lg);
}

.section-alt {
    background: var(--color-light-gray);
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: 4px;
    color: var(--color-matte-black);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1rem;
    color: var(--color-dark-gray);
    letter-spacing: 1px;
}

/* ========================================
   画廊网格布局
   ======================================== */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-md);
    max-width: 1600px;
    margin: 0 auto;
}

.gallery-item {
    position: relative;
    overflow: hidden;
    background: var(--color-white);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transition: var(--transition-smooth);
}

.gallery-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

.gallery-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.gallery-item:hover .gallery-image {
    transform: scale(1.05);
}

.gallery-info {
    padding: var(--spacing-md);
}

.gallery-title {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.gallery-desc {
    font-size: 0.9rem;
    color: var(--color-dark-gray);
    line-height: 1.8;
}

/* ========================================
   资讯列表区块
   ======================================== */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    max-width: 1600px;
    margin: 0 auto;
}

.news-card {
    background: var(--color-white);
    border: 1px solid var(--color-medium-gray);
    transition: var(--transition-smooth);
}

.news-card:hover {
    border-color: var(--color-matte-black);
}

.news-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.news-content {
    padding: var(--spacing-md);
}

.news-date {
    font-size: 0.85rem;
    color: var(--color-dark-gray);
    margin-bottom: var(--spacing-xs);
}

.news-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.news-excerpt {
    font-size: 0.9rem;
    color: var(--color-dark-gray);
    line-height: 1.8;
}

/* ========================================
   关于页面
   ======================================== */
.about-hero {
    height: 70vh;
    background: linear-gradient(135deg, var(--color-light-gray) 0%, var(--color-white) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.about-title {
    font-size: 3.5rem;
    font-weight: 300;
    letter-spacing: 6px;
    color: var(--color-matte-black);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

.about-text {
    font-size: 1.1rem;
    line-height: 2;
    color: var(--color-matte-black);
    margin-bottom: var(--spacing-md);
}

/* ========================================
   服务页面
   ======================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    max-width: 1600px;
    margin: 0 auto;
}

.service-card {
    background: var(--color-white);
    padding: var(--spacing-lg);
    text-align: center;
    border: 1px solid var(--color-medium-gray);
    transition: var(--transition-smooth);
}

.service-card:hover {
    border-color: var(--color-matte-black);
    transform: translateY(-5px);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-matte-black);
}

.service-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.service-desc {
    font-size: 0.95rem;
    color: var(--color-dark-gray);
    line-height: 1.8;
}

/* ========================================
   作品页面
   ======================================== */
.works-filter {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.filter-btn {
    padding: 12px 32px;
    border: 1px solid var(--color-medium-gray);
    background: transparent;
    font-size: 0.9rem;
    letter-spacing: 1px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    border-color: var(--color-matte-black);
    background: var(--color-matte-black);
    color: var(--color-white);
}

/* ========================================
   新闻列表页面
   ======================================== */
.news-list-page {
    padding-top: 120px;
}

.news-list-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

.news-list-item {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-medium-gray);
}

.news-list-item:last-child {
    border-bottom: none;
}

.news-list-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.news-list-info {
    padding: var(--spacing-sm) 0;
}

.news-list-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.news-list-meta {
    font-size: 0.9rem;
    color: var(--color-dark-gray);
    margin-bottom: var(--spacing-sm);
}

.news-list-excerpt {
    font-size: 1rem;
    color: var(--color-matte-black);
    line-height: 1.8;
}

/* ========================================
   新闻详情页面
   ======================================== */
.news-detail {
    padding-top: 120px;
}

.news-detail-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

.news-detail-header {
    margin-bottom: var(--spacing-lg);
}

.news-detail-title {
    font-size: 2.5rem;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

.news-detail-meta {
    font-size: 0.95rem;
    color: var(--color-dark-gray);
}

.news-detail-image {
    width: 100%;
    height: 500px;
    object-fit: cover;
    margin-bottom: var(--spacing-lg);
}

.news-detail-content {
    font-size: 1.1rem;
    line-height: 2;
    color: var(--color-matte-black);
}

.news-detail-content p {
    margin-bottom: var(--spacing-md);
}

/* ========================================
   联系页面
   ======================================== */
.contact-hero {
    height: 60vh;
    background: linear-gradient(135deg, var(--color-light-gray) 0%, var(--color-white) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.contact-title {
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: 6px;
    color: var(--color-matte-black);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: var(--spacing-xl) auto;
    padding: 0 var(--spacing-md);
}

.contact-card {
    background: var(--color-white);
    padding: var(--spacing-lg);
    text-align: center;
    border: 1px solid var(--color-medium-gray);
}

.contact-card-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.contact-card-text {
    font-size: 0.95rem;
    color: var(--color-dark-gray);
    line-height: 1.8;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3.5rem;
    }
    
    .footer-inner {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: var(--color-white);
        flex-direction: column;
        padding: 100px var(--spacing-md);
        transition: var(--transition-smooth);
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.1);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
        letter-spacing: 4px;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
    }
    
    .news-list-item {
        grid-template-columns: 1fr;
    }
    
    .footer-inner {
        grid-template-columns: 1fr;
    }
    
    .about-title,
    .contact-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .logo {
        font-size: 1.4rem;
    }
}