/* header.css */
:root {
    --primary-yellow: #f7d300;
    --text-dark: #1a1a1a;
    --text-gray: #666;
}

body {
    margin: 0;
    font-family: -apple-system, sans-serif;
    background-image: linear-gradient(to right, #f5f5f5 1px, transparent 1px), 
                      linear-gradient(to bottom, #f5f5f5 1px, transparent 1px);
    background-size: 30px 30px;
}

/* 固定头部样式 */
header {
    position: fixed;
    top: 0;
    width: 100%;
    height: 70px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #eee;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5%;
}

.logo-area { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; }
.logo-icon { background: var(--primary-yellow); width: 32px; height: 32px; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-weight: bold; }
.logo-text { font-size: 20px; font-weight: 700; }
.logo-text span { color: #999; font-weight: 300; }

nav ul { display: flex; list-style: none; gap: 30px; }
nav ul li a { text-decoration: none; color: var(--text-gray); font-size: 15px; }
nav ul li a.active { color: var(--text-dark); font-weight: 700; border-bottom: 2px solid var(--primary-yellow); }

main { padding: 100px 5% 50px; max-width: 1200px; margin: 0 auto; }