/* 基础变量 */
:root {
    --sand-light: #e8e0d5;   /* 浅沙色 */
    --sand-dark:  #c9c5b4;   /* 深沙色 */
    --sand-accent: #a89a8c;  /* 强调色 */
    --primary: #6b5b95;      /* 主色（紫灰） */
    --secondary: #f0f0f0;    /* 辅助色 */
    --text-dark: #333;
    --text-light: #fff;
    
    --space-sm: 0.8rem;
    --space-md: 1.5rem;
    --space-lg: 3rem;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, 
                 "Helvetica Neue", "Noto Sans SC", sans-serif;
    background: linear-gradient(135deg, var(--sand-light) 0%, var(--sand-dark) 100%);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 头部导航 */
.header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    padding: var(--space-sm) var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 2px solid var(--sand-accent);
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary);
}

.nav ul {
    display: flex;
    list-style: none;
    gap: var(--space-md);
}

.nav a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
}

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

.search-box {
    display: flex;
    align-items: center;
}

.search-box input {
    padding: 0.5rem;
    border: 1px solid var(--sand-accent);
    border-radius: 4px;
    outline: none;
}

.search-box button {
    background: var(--primary);
    color: var(--text-light);
    border: none;
    padding: 0.5rem 0.8rem;
    margin-left: 0.3rem;
    border-radius: 4px;
    cursor: pointer;
}

/* 英雄区域 */
.hero {
    position: relative;
    padding: var(--space-lg) var(--space-md);
    text-align: center;
    overflow: hidden;
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero-content {
    z-index: 2;
}

.hero h1 {
    font-size: clamp(2.5rem, 8vw, 4rem);
    color: var(--primary);
    margin-bottom: var(--space-sm);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin-bottom: var(--space-md);
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.btn-secondary {
    background: var(--sand-accent);
    color: var(--text-dark);
    margin-left: 1rem;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* 砂纹背景（使用 SVG） */
.sand-texture {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100'%3E%3Cpath d='M0 0h100v100H0z' fill='%23c9c5b4' opacity='0.1'/%3E%3C/svg%3E");
    background-size: 200px;
    z-index: 1;
}

/* 部分区域样式 */
.section {
    padding: var(--space-lg) var(--space-md);
    max-width: 1200px;
    margin: 0 auto;
}

.section h2 {
    text-align: center;
    margin-bottom: var(--space-lg);
    color: var(--primary);
    position: relative;
}

.section h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--sand-accent);
    margin: 0.5rem auto;
}

/* 资源库样式 */
.filter-buttons {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1rem;
    background: var(--sand-light);
    border: 1px solid var(--sand-accent);
    border-radius: 20px;
    cursor: pointer;
    transition: background 0.3s;
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--primary);
    color: var(--text-light);
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
}

.resource-card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 12px;
    padding: var(--space-sm);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid var(--sand-accent);
}

.resource-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.card-thumb img {
    width: 100%;
    border-radius: 8px;
    aspect-ratio: 16/9;
    object-fit: cover;
}

.resource-card h3 {
    margin: var(--space-sm) 0;
    color: var(--primary);
}

.card-link {
    display: inline-block;
    margin-top: var(--space-sm);
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

/* 工具卡片样式 */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
}

.tool-card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 12px;
    padding: var(--space-md);
    text-align: center;
    border: 1px solid var(--sand-accent);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.tool-card:hover {
    transform: translateY(-5px);
}

.tool-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
    color: var(--primary);
}

.tool-link {
    display: block;
    margin-top: var(--space-sm);
    color: var(--primary);
    text-decoration: none;
    font-weight: bold;
}

/* 作品集样式 */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
}

.gallery-item {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    aspect-ratio: 1/1;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.gallery-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0,0,0,0.7);
    color: var(--text-light);
    padding: var(--space-sm);
}

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

/* 社区卡片 */
.community-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
}

.community-card {
    background: rgba(255, 255, 255, 0.9);
    padding: var(--space-md);
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--sand-accent);
}

.community-link {
    display: block;
    margin-top: var(--space-sm);
    color: var(--primary);
    text-decoration: none;
    font-weight: bold;
}

/* 页脚 */
.footer {
    background: var(--primary);
    color: var(--text-light);
    padding: var(--space-lg) var(--space-md) var(--space-sm);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.footer-about h4,
.footer-links h5,
.footer-contact h5 {
    margin-bottom: var(--space-sm);
}

.footer-links a,
.footer-contact p {
    display: block;
    color: var(--text-light);
    text-decoration: none;
    margin-bottom: var(--space-xs);
}

.footer-links a:hover {
    text-decoration: underline;
}

.footer-bottom {
    text-align: center;
    margin-top: var(--space-lg);
    padding-top: var(--space-sm);
    border-top: 1px solid rgba(255,255,255,0.2);
}

.carbon-note {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .btn-secondary {
        margin-left: 0;
    }
}