:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --accent-color: #58a6ff;
    --border-color: #30363d;
    --card-hover: #1f2937;
}

/* 基础样式 */
body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    line-height: 1.5;
    margin: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* 头部样式 */
.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.nav-item {
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.nav-item:hover {
    opacity: 1;
}

/* 主要内容区域 */
.main {
    margin-top: 4rem;
    padding: 2rem 0;
}

.hero {
    text-align: center;
    padding: 4rem 0;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, var(--accent-color), #58a6ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    color: var(--text-secondary);
    font-size: 1.25rem;
}

/* 工具卡片样式 */
.tools-section {
    margin-bottom: 4rem;
}

.tools-section h2 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
    margin-bottom: 2rem;
    text-align: center;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.tool-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    text-decoration: none;
    color: var(--text-primary);
    text-align: center;
    transition: all 0.3s ease;
}

.tool-card:hover {
    background-color: var(--card-hover);
    transform: translateY(-4px);
}

.tool-card i {
    font-size: 2rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.tool-card h3 {
    margin: 0.5rem 0;
}

.tool-card p {
    color: var(--text-secondary);
    margin: 0;
}

/* 页脚样式 */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
}

.footer-content {
    color: var(--text-secondary);
}

.footer a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-wrapper {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
}