/* ===== 基础样式重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ===== CSS 变量定义 ===== */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --background-color: #ffffff;
    --surface-color: #f8fafc;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --transition: all 0.2s ease;
    --container-width: 1200px;
    --container-padding: 1rem;
}

/* ===== 基础排版 ===== */
html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-color);
    font-size: 16px;
}

/* ===== 布局组件 ===== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ===== 头部导航 ===== */
.header {
    background: var(--background-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
}

.nav-logo:hover {
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
}

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

/* ===== 主要内容区域 ===== */
.main {
    min-height: calc(100vh - 128px);
}

/* ===== 页面头部 ===== */
.hero {
    background: linear-gradient(135deg, var(--surface-color) 0%, var(--background-color) 100%);
    padding: 4rem 0;
    text-align: center;
}

.hero-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
}

.stat-item {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.page-header {
    background: var(--surface-color);
    padding: 3rem 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.page-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* ===== 内容区块 ===== */
section {
    padding: 4rem 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--text-primary);
}

.section-footer {
    text-align: center;
    margin-top: 3rem;
}

/* ===== 按钮样式 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

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

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

.btn-secondary {
    background: var(--surface-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

/* ===== 面包屑导航 ===== */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    font-size: 0.875rem;
}

.breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.breadcrumb-separator {
    color: var(--text-muted);
}

.breadcrumb-current {
    color: var(--text-primary);
    font-weight: 500;
}

/* ===== About Us 页面 ===== */
.about-section {
    background: var(--background-color);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.about-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
    color: var(--text-primary);
}

.about-content h2:first-child {
    margin-top: 0;
}

.about-content p {
    margin-bottom: 1.5rem;
}

.about-content ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.about-content li {
    margin-bottom: 0.75rem;
}

.about-content strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* ===== Contact 页面 ===== */
.contact-section {
    background: var(--background-color);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.contact-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
    color: var(--text-primary);
}

.contact-content h2:first-child {
    margin-top: 0;
}

.contact-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 1.5rem 0 0.75rem;
    color: var(--text-primary);
}

.contact-content p {
    margin-bottom: 1.5rem;
}

.contact-content ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.contact-content li {
    margin-bottom: 0.5rem;
}

.contact-methods {
    margin-top: 2rem;
}

.contact-method {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 2rem;
    background: var(--surface-color);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
    transition: var(--transition);
}

.contact-method:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.contact-icon {
    font-size: 3rem;
    flex-shrink: 0;
}

.contact-info h3 {
    margin-top: 0;
    margin-bottom: 0.5rem;
}

.contact-info p {
    margin-bottom: 1rem;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
}

.contact-link:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.contact-submissions,
.contact-feedback,
.contact-response {
    padding: 1.5rem;
    background: var(--surface-color);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.contact-response {
    background: linear-gradient(135deg, var(--surface-color) 0%, var(--background-color) 100%);
    border-color: var(--primary-color);
}

.contact-response p {
    margin-bottom: 0;
}

/* ===== Gallery 页面 ===== */
.gallery-section {
    background: var(--background-color);
}

.gallery-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.gallery-stats {
    display: flex;
    gap: 2rem;
    font-size: 1rem;
    color: var(--text-secondary);
}

.gallery-nav {
    display: flex;
    gap: 1rem;
}

/* 扩展的画廊网格用于Gallery页面 */
.gallery-section .gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.gallery-footer {
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0;
    margin-top: 4rem;
}

.call-to-action {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.call-to-action h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.call-to-action p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

/* Gallery页面响应式设计 */
@media (max-width: 768px) {
    .gallery-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }

    .gallery-stats {
        flex-direction: column;
        gap: 0.5rem;
    }

    .gallery-nav {
        width: 100%;
        justify-content: center;
    }

    .gallery-section .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1rem;
    }

    .call-to-action h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .gallery-section .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }

    .call-to-action h2 {
        font-size: 1.25rem;
    }

    .call-to-action p {
        font-size: 1rem;
    }
}

/* ===== 底部 ===== */
.footer {
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
}

/* ===== 空状态 ===== */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-secondary);
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    :root {
        --container-padding: 0.75rem;
    }

    .nav-container {
        height: 56px;
    }

    .nav-links {
        gap: 1rem;
        font-size: 0.875rem;
    }

    .hero {
        padding: 3rem 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-stats {
        gap: 2rem;
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .page-title {
        font-size: 2rem;
    }

    section {
        padding: 3rem 0;
    }

    .footer-container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }

    .section-title {
        font-size: 1.25rem;
    }
}