/* 全局重置与基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    background-color: #f8fafc;
    color: #2d3748;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 导航栏 */
.navbar {
    background-color: #02598a;
    color: #fff;
    padding: 12px 20px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
}

.navbar .brand {
    font-size: 24px;
    font-weight: bold;
    letter-spacing: 2px;
}

.navbar .nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.navbar .nav-links a {
    color: #fff;
    text-decoration: none;
    font-size: 16px;
    padding: 6px 12px;
    border-radius: 20px;
    transition: background 0.3s;
}

.navbar .nav-links a:hover,
.navbar .nav-links a.active {
    background: rgba(255, 255, 255, 0.2);
}

/* 通用卡片样式 */
.card {
    background: #fff;
    border-radius: 24px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

/* 页面标题 */
.page-header {
    text-align: center;
    margin-bottom: 30px;
}

.page-title {
    font-size: 36px;
    font-weight: bold;
    color: #02598a;
}

.page-sub {
    font-size: 18px;
    color: #888;
    margin-top: 8px;
}

/* 图片自适应 - 关键修正 */
img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 16px;
}

/* 响应式 */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: stretch;
    }
    .navbar .nav-links {
        justify-content: center;
        margin-top: 10px;
    }
    .container {
        padding: 12px;
    }
    .page-title {
        font-size: 28px;
    }
}