/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    font-family: "Microsoft Yahei", "Helvetica Neue", sans-serif;
    background: #f4f6f9;
}

/* ======================
   顶部栏（仿大学官网风格）
====================== */
header {
    background: #1f4e79;
    color: #fff;
    padding: 0;
}

/* Logo + 标题区 */
.header-top {
    padding: 20px 30px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.logo h1 {
    font-size: 30px;
    margin-bottom: 5px;
}

.logo p {
    font-size: 14px;
    opacity: 0.9;
}

.logo .english {
    font-size: 13px;
    opacity: 0.8;
}

/* 导航栏（和图1一样的顶栏） */
nav {
    background: #285b8e;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0;
    flex-wrap: wrap;
}

nav a,
.dropbtn {
    color: #fff;
    text-decoration: none;
    padding: 14px 22px;
    background: transparent;
    font-size: 16px;
    border: none;
    cursor: pointer;
    transition: 0.2s;
}

nav a:hover,
.dropbtn:hover {
    background: #1f4e79;
}

/* 下拉菜单修复 */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: #fff;
    min-width: 150px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    z-index: 9999;
}

.dropdown-content a {
    display: block;
    color: #333;
    padding: 12px 16px;
    text-align: left;
}

.dropdown-content a:hover {
    background: #e8f0f8;
    color: #1f4e79;
}

.dropdown:hover .dropdown-content {
    display: block;
}

/* ======================
   内容区
====================== */
.content {
    flex: 1;
    width: 90%;
    max-width: 1100px;
    margin: 40px auto;
    background: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

.content h2 {
    color: #1f4e79;
    margin-bottom: 20px;
    font-size: 24px;
}

.content p {
    font-size: 16px;
    line-height: 1.7;
    color: #444;
    margin-bottom: 14px;
}

/* ======================
   页脚
====================== */
footer {
    background: #1f4e79;
    color: #fff;
    text-align: center;
    padding: 20px;
    font-size: 14px;
}