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

body.index-page {
    font-family: Gill Sans, Gill Sans MT, Calibri, sans-serif;
    font-size: 16px;
    color: #293a43;
    background-color: #5e70cb;
    background-image: url('skynight.jpg');
    background-size: cover;
    background-attachment: fixed;
    background-position: center;
}

/* Logo 样式 */
.site-logo {
    height: 60px;
    width: auto;
    display: inline-block;
    vertical-align: middle;
    margin-right: 20px;
}

.header-content {
    display: flex;
    align-items: center;
}

.header-content h1 {
    flex: 1;
    margin: 0;
    border-bottom: 3px solid #244b9f;
    padding-bottom: 10px;
    font-size: 24px;
    color: #000000;
}

#container {
    width: 980px;
    padding: 0;
    margin: 20px auto;
    background-color: #a4a2a2;
    border: 2px solid #666;
    border-radius: 0;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

header {
    padding: 15px 25px;
    border-bottom: 2px solid #666;
    background-color: #999797;
    overflow: auto;
}

/* 移除原来的 header h1 单独样式，因为已经在 .header-content h1 中定义了 */
/* header h1 {
    color: #000000;
    border-bottom: 3px solid #244b9f;
    padding-bottom: 10px;
    font-size: 24px;
} */

nav {
    background-color: #9a9a9a;
    padding: 15px 10px;
    border-bottom: 2px solid #666;
    padding-left: 50px;
    line-height: 2;
}

nav a {
    color: #aca8a8;
    font-size: 14px;
    padding: 8px 12px;
    margin-right: 10px;
    margin-bottom: 8px;
    background-color: rgb(67, 67, 115);
    text-decoration: none;
    display: inline-block;
    border-radius: 3px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: #448;
    text-decoration: none;
}

#sidebar {
    padding: 25px;
    float: left;
    width: 220px;
    background-color: #9b9191;
    min-height: calc(150vh - 100px);
    border-right: 1px solid #ffffff;
}

.purplebox {
    background-color: #336;
    border: 2px dotted #ffffff;
    padding: 10px;
    font-size: 14px;
    color: #a8a3a3;
    margin-bottom: 15px;
    border-radius: 5px;
}

.purplebox a {
    color: #9b9898;
    text-decoration: underline;
}

.purplebox a:hover {
    color: #d67b0c;
}

.purplebox h3 {
    margin-top: 0;
    color: #fff;
}

#content {
    padding: 20px 25px;
    margin-left: 270px;
    min-height: 500px;
    background-color: #9e9898;
}

#content h1 {
    color: #336;
    margin-bottom: 10px;
    font-size: 24px;
}

#content h2 {
    color: #53158a;
    margin-top: 30px;
    font-size: 20px;
}

#content h3 {
    color: #666;
    margin: 20px 0 10px 0;
}

#content a {
    color: #d67b0c;
    text-decoration: none;
}

#content a:hover {
    text-decoration: underline;
}

#content ul {
    line-height: 1.6;
    margin: 15px 0 15px 20px;
}

#content li {
    margin-bottom: 5px;
}

.bio-section {
    background-color: #c7cacd;
    padding: 15px;
    border-left: 5px solid #aed3cd;
    margin: 20px 0;
}

.byline {
    background-color: #ccc;
    color: #336;
    font-size: 12px;
    width: 150px;
    display: block;
    padding: 5px 10px;
    margin-bottom: 15px;
    border-radius: 3px;
}

#content img {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    margin: 10px 0;
}

footer {
    clear: both;
    background-color: rgb(132, 143, 181);
    padding: 15px 25px;
    border-top: 2px solid #666;
    text-align: center;
}

footer p {
    margin: 0;
    padding: 0;
    color: #777;
}

@media (max-width: 1000px) {
    #container {
        width: 95%;
        margin: 10px auto;
    }
    
    nav {
        padding-left: 25px;
    }
    
    #sidebar {
        float: none;
        width: 100%;
        border-right: none;
        border-bottom: 1px solid #eee;
        min-height: auto;
    }
    
    #content {
        margin-left: 0;
    }
    
    /* 响应式调整logo */
    .site-logo {
        height: 50px;
        margin-right: 15px;
    }
}

@media (max-width: 600px) {
    nav a {
        display: block;
        margin-bottom: 5px;
        margin-right: 0;
        width: 100%;
        text-align: center;
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .site-logo {
        margin-right: 0;
        margin-bottom: 10px;
        height: 40px;
    }
    
    .header-content h1 {
        border-bottom: none;
        padding-bottom: 0;
    }
}

/* index2.html 的样式 */
body:not(.index-page) {
    font-family: Verdana, sans-serif;
    font-size: 1em;
    line-height: 1.6;
    background-color: #f5f5f5;
    color: #333;
}

body:not(.index-page) #container {
    background-color: #FFF;
}

body:not(.index-page) header {
    background-color: #FFF;
}

body:not(.index-page) header img {
    display: block;
}

body:not(.index-page) nav {
    background-color: #FFF;
    padding-left: 290px;
    line-height: 1.6;
}

body:not(.index-page) nav a {
    color: #fff;
    background-color: #336;
    margin-bottom: 5px;
}

body:not(.index-page) #sidebar {
    background-color: #f8f8f8;
    border-right: 1px solid #eee;
}

body:not(.index-page) .purplebox {
    background-color: #336;
    border: 2px dotted #fff;
    color: #fff;
}

body:not(.index-page) .purplebox a {
    color: #fff;
}

body:not(.index-page) #content {
    background-color: #FFF;
    background-image: url('week3-ex-bgthingy.gif');
    background-repeat: no-repeat;
    background-position: bottom right;
}

body:not(.index-page) article h1 {
    color: #336;
}

body:not(.index-page) article h2, 
body:not(.index-page) article h3 {
    color: #666;
}

body:not(.index-page) footer {
    background-color: #FCF;
}