:root {
    --bg: #f0f7ff;
    --bg-card: #ffffff;
    --border: #e0eaff;
    --primary: #0066ff;
    --primary-dark: #0052cc;
    --text: #1a1a2e;
    --text-light: #666680;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.8;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

/* 头部 */
.header {
    background: var(--bg-card);
    border-bottom: 2px solid var(--primary);
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}
.logo-icon {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--primary), #00aaff);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 700;
    color: white;
}
.logo-text { font-size: 1.25rem; font-weight: 600; color: var(--text); }
.nav { display: flex; gap: 2rem; }
.nav a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: all 0.3s;
}
.nav a:hover { color: var(--primary); border-bottom-color: var(--primary); }

/* 横幅 */
.banner {
    background: linear-gradient(135deg, var(--primary) 0%, #0099ff 100%);
    color: white;
    padding: 3rem 0;
    text-align: center;
}
.banner h1 { font-size: 2.2rem; font-weight: 600; margin-bottom: 0.75rem; }
.banner p { font-size: 1rem; opacity: 0.9; max-width: 600px; margin: 0 auto; }
.banner-tags { display: flex; gap: 0.75rem; justify-content: center; margin-top: 1.5rem; flex-wrap: wrap; }
.banner-tag {
    background: rgba(255,255,255,0.2);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
}

/* 精选区 */
.section { padding: 2.5rem 0; }
.section-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    padding-left: 1rem;
    border-left: 4px solid var(--primary);
}

/* 网格 */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}
.card {
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
    transition: all 0.3s;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 8px 25px rgba(0,102,255,0.15); }
.card-img { position: relative; overflow: hidden; }
.card-img img { width: 100%; aspect-ratio: 16/10; object-fit: cover; display: block; }
.card-badge {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    background: var(--primary);
    color: white;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
}
.card-body { padding: 1.25rem; }
.card-body h3 { font-size: 1rem; margin-bottom: 0.5rem; color: var(--text); }
.card-body p { font-size: 0.85rem; color: var(--text-light); line-height: 1.6; }

/* 内容 */
.content-area {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
    border: 1px solid var(--border);
}
.content-area h2 { font-size: 1.3rem; margin-bottom: 1rem; color: var(--text); }
.content-area p { margin-bottom: 1rem; color: var(--text-light); line-height: 2; }
.content-area img { max-width: 100%; border-radius: 8px; margin: 1rem 0; }

/* 标签云 */
.tags { display: flex; gap: 0.5rem; flex-wrap: wrap; margin: 1.5rem 0; }
.tag {
    background: var(--bg);
    color: var(--primary);
    padding: 0.35rem 0.85rem;
    border-radius: 20px;
    font-size: 0.8rem;
    text-decoration: none;
    border: 1px solid var(--border);
}
.tag:hover { background: var(--primary); color: white; }

/* 页脚 */
.footer {
    background: var(--text);
    color: rgba(255,255,255,0.7);
    padding: 2rem 0;
    text-align: center;
    margin-top: 2rem;
}
.footer p { font-size: 0.85rem; }
.footer a { color: rgba(255,255,255,0.7); text-decoration: none; }
.footer a:hover { color: white; }

/* 文章页 */
.article-header { padding: 2rem 0; text-align: center; }
.article-header h1 { font-size: 1.8rem; margin-bottom: 0.75rem; }
.article-meta { color: var(--text-light); font-size: 0.85rem; }
.article-content { max-width: 800px; margin: 0 auto; }
.article-content p { margin-bottom: 1.2rem; line-height: 2; }
.back-btn {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 0.75rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    .header-inner { flex-direction: column; gap: 1rem; }
    .nav { gap: 1rem; }
    .grid-3 { grid-template-columns: 1fr; }
    .banner h1 { font-size: 1.5rem; }
}