/* ========================================
   SEEN ART - 主样式表
   ======================================== */

/* ----------------------------------------
   CSS 变量
   ---------------------------------------- */
:root {
    /* 颜色 */
    --color-primary: #C4623A;
    --color-primary-dark: #A34E2B;
    --color-text: #1a1a1a;
    --color-text-light: #666;
    --color-text-muted: #999;
    --color-bg: #FAFAFA;
    --color-bg-white: #FFFFFF;
    --color-border: #E5E5E5;
    --color-overlay: rgba(0, 0, 0, 0.4);
    
    /* 字体 */
    --font-serif: 'Noto Serif SC', 'Songti SC', serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 50%;
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    
    /* 容器 */
    --container-max: 1200px;
    --header-height: 80px;
}

/* ----------------------------------------
   重置 & 基础
   ---------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
    list-style: none;
}

/* ----------------------------------------
   容器
   ---------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ----------------------------------------
   按钮
   ---------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 2rem;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    text-align: center;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-text);
    border: 1.5px solid var(--color-text);
}

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

.btn-text {
    background: none;
    padding: 0.5rem 0;
    color: var(--color-primary);
    font-weight: 500;
}

.btn-text:hover {
    color: var(--color-primary-dark);
}

.btn-text svg {
    transition: transform var(--transition-fast);
}

.btn-text:hover svg {
    transform: translateX(4px);
}

/* ----------------------------------------
   头部导航
   ---------------------------------------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
}

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

.logo {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.logo-text {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--color-text);
}

.logo-sub {
    font-size: 0.6875rem;
    letter-spacing: 0.2em;
    color: var(--color-text-muted);
}

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

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-light);
    padding: var(--spacing-xs) 0;
    position: relative;
}

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

.nav-link:hover {
    color: var(--color-text);
}

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

/* 移动端菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 28px;
    height: 28px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-fast);
}

/* ----------------------------------------
   Hero 首屏
   ---------------------------------------- */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #E8D5C4 0%, #F5EBE0 50%, #D4C4B0 100%);
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 30% 20%, rgba(196, 98, 58, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(196, 98, 58, 0.1) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    text-align: center;
    padding: var(--spacing-lg);
    max-width: 800px;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 600;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease forwards;
}

.hero-subtitle {
    font-size: clamp(1rem, 3vw, 1.25rem);
    color: var(--color-primary);
    letter-spacing: 0.3em;
    margin-bottom: var(--spacing-md);
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease 0.2s forwards;
}

.hero-desc {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease 0.4s forwards;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease 0.6s forwards;
}

.hero-scroll {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-muted);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    opacity: 0;
    animation: fadeIn 1s ease 1s forwards;
}

.scroll-indicator {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-text-muted), transparent);
    animation: scrollPulse 2s ease infinite;
}

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

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

@keyframes scrollPulse {
    0%, 100% {
        transform: scaleY(1);
        opacity: 1;
    }
    50% {
        transform: scaleY(0.5);
        opacity: 0.5;
    }
}

/* ----------------------------------------
   Section 通用
   ---------------------------------------- */
.section {
    padding: var(--spacing-2xl) 0;
}

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

.section-label {
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    color: var(--color-text-muted);
    text-transform: uppercase;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 600;
    margin-top: var(--spacing-xs);
}

.section-desc {
    margin-top: var(--spacing-sm);
    color: var(--color-text-light);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

/* ----------------------------------------
   展览区块
   ---------------------------------------- */
.exhibition-section {
    background-color: var(--color-bg-white);
}

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

.exhibition-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 16/9;
}

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

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

.exhibition-badge {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-primary);
    color: white;
    font-size: 0.8125rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
}

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

.exhibition-title {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.exhibition-meta {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-md);
}

.exhibition-desc {
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

/* ----------------------------------------
   课程区块
   ---------------------------------------- */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

.course-card {
    background-color: var(--color-bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.course-image {
    aspect-ratio: 4/3;
    overflow: hidden;
}

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

.course-card:hover .course-image img {
    transform: scale(1.1);
}

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

.course-age {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: rgba(196, 98, 58, 0.1);
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-xs);
}

.course-title {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.course-desc {
    font-size: 0.875rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

/* ----------------------------------------
   作品画廊
   ---------------------------------------- */
.gallery-section {
    background-color: var(--color-bg-white);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 200px);
    gap: var(--spacing-sm);
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-md);
    cursor: pointer;
}

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

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 60%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: var(--spacing-md);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-title {
    color: white;
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.gallery-author {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

/* ----------------------------------------
   活动区块
   ---------------------------------------- */
.activities-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

.activity-card {
    padding: var(--spacing-lg);
    background-color: var(--color-bg-white);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-normal);
    border: 1px solid var(--color-border);
}

.activity-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.activity-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(196, 98, 58, 0.08);
    border-radius: var(--radius-full);
    color: var(--color-primary);
}

.activity-title {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.activity-desc {
    font-size: 0.875rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

/* ----------------------------------------
   新闻区块
   ---------------------------------------- */
.news-section {
    background-color: var(--color-bg-white);
}

.news-list {
    max-width: 800px;
    margin: 0 auto;
}

.news-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.news-item:hover {
    padding-left: var(--spacing-sm);
}

.news-date {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    white-space: nowrap;
    min-width: 80px;
}

.news-title {
    flex: 1;
    font-size: 1rem;
    font-weight: 500;
}

.news-title a:hover {
    color: var(--color-primary);
}

.news-tag {
    font-size: 0.75rem;
    color: var(--color-primary);
    background-color: rgba(196, 98, 58, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
}

/* ----------------------------------------
   页脚
   ---------------------------------------- */
.footer {
    background-color: var(--color-text);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo .logo-text {
    color: white;
}

.footer-logo .logo-sub {
    color: rgba(255, 255, 255, 0.6);
}

.footer-desc {
    margin-top: var(--spacing-md);
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.8;
}

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

.footer-col h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: white;
}

.footer-col ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-col ul li a,
.footer-col ul li {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
    color: white;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom a:hover {
    color: white;
}

/* ----------------------------------------
   响应式设计
   ---------------------------------------- */

/* 平板 */
@media (max-width: 1024px) {
    :root {
        --header-height: 70px;
    }
    
    .courses-grid,
    .activities-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .gallery-grid {
        grid-template-columns: repeat(3, 1fr);
        grid-template-rows: repeat(3, 180px);
    }
    
    .gallery-item-large {
        grid-column: span 1;
        grid-row: span 1;
    }
    
    .gallery-item:first-child {
        grid-column: span 2;
        grid-row: span 2;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 移动端 */
@media (max-width: 768px) {
    :root {
        --header-height: 60px;
        --spacing-2xl: 3.5rem;
    }
    
    /* 导航 */
    .nav-toggle {
        display: flex;
    }
    
    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background-color: var(--color-bg-white);
        padding: var(--spacing-lg);
        transform: translateX(100%);
        transition: transform var(--transition-normal);
    }
    
    .nav.active {
        transform: translateX(0);
    }
    
    .nav-list {
        flex-direction: column;
        gap: 0;
    }
    
    .nav-item {
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav-link {
        display: block;
        padding: var(--spacing-md) 0;
        font-size: 1.125rem;
    }
    
    /* Hero */
    .hero {
        min-height: 500px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-buttons .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
    
    .hero-scroll {
        display: none;
    }
    
    /* 展览 */
    .exhibition-card {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .exhibition-info {
        padding: 0;
    }
    
    .exhibition-title {
        font-size: 1.375rem;
    }
    
    /* 课程 & 活动 */
    .courses-grid,
    .activities-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .course-card,
    .activity-card {
        display: grid;
        grid-template-columns: 120px 1fr;
        align-items: center;
    }
    
    .course-image {
        aspect-ratio: 1;
    }
    
    .course-content,
    .activity-card {
        padding: var(--spacing-sm);
    }
    
    .activity-card {
        grid-template-columns: 60px 1fr;
        text-align: left;
    }
    
    .activity-icon {
        width: 60px;
        height: 60px;
        margin: 0;
    }
    
    .activity-icon svg {
        width: 28px;
        height: 28px;
    }
    
    /* 画廊 */
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: repeat(4, 150px);
    }
    
    .gallery-item:first-child {
        grid-column: span 2;
    }
    
    /* 新闻 */
    .news-item {
        flex-wrap: wrap;
        gap: var(--spacing-xs);
    }
    
    .news-date {
        order: 2;
        font-size: 0.75rem;
    }
    
    .news-title {
        order: 1;
        width: 100%;
        flex: none;
    }
    
    .news-tag {
        order: 3;
    }
    
    /* 页脚 */
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-col:last-child {
        grid-column: span 2;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-xs);
        text-align: center;
    }
}

/* 小屏手机 */
@media (max-width: 480px) {
    .logo-text {
        font-size: 1.25rem;
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .course-card {
        grid-template-columns: 1fr;
    }
    
    .course-image {
        aspect-ratio: 16/9;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(5, 200px);
    }
    
    .gallery-item:first-child {
        grid-column: span 1;
    }
}