/* index.html 样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', sans-serif;
}

body {
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    color: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

.container {
    display: flex;
    flex: 1;
    gap: 20px;
}

.main-content {
    flex: 3;
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.homework-content {
    background: #f9f9f9;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #2575fc;
    min-height: 400px;
    line-height: 1.8;
    word-wrap: break-word; /* 允许长单词换行 */
    white-space: normal; /* 确保空白正常处理 */
    overflow-wrap: break-word; /* 更现代的换行属性 */
}

.section-title {
    font-size: 1.3rem;
    font-weight: bold;
    color: #2575fc;
    margin: 20px 0 10px 0;
    padding-bottom: 5px;
    border-bottom: 2px solid #e0e0e0;
}

.bullet-list {
    margin: 10px 0 10px 20px;
    list-style-type: none;
}

.bullet-list li {
    margin-bottom: 8px;
    position: relative;
    padding-left: 15px;
}

.bullet-list li:before {
    content: "·";
    position: absolute;
    left: 0;
    color: #666;
    font-weight: bold;
}

.bold-text {
    font-weight: bold;
    color: #2c3e50;
}

.normal-text {
    margin: 8px 0;
}

.sidebar {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.download-section, .history-section {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.btn {
    display: inline-block;
    padding: 12px 25px;
    margin: 10px 5px;
    background: #2575fc;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn:hover {
    background: #1a5fd8;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-download {
    background: #4CAF50;
}

.btn-download:hover {
    background: #45a049;
}

.btn-history {
    background: #FF9800;
}

.btn-history:hover {
    background: #e68900;
}

footer {
    text-align: center;
    margin-top: 30px;
    padding: 15px;
    color: #666;
    font-size: 0.9rem;
}

.app-link {
    margin-top: 10px;
    display: block;
    color: #2575fc;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

.app-link:hover {
    color: #1a5fd8;
    text-decoration: underline;
}

.date-info {
    margin-top: 15px;
    font-style: italic;
    color: #666;
    text-align: right;
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }
    
    h1 {
        font-size: 2rem;
    }
}

/* 暗黑模式样式 */
body.dark-mode {
    background-color: #1a1a1a;
    color: #e0e0e0;
}

body.dark-mode .main-content,
body.dark-mode .download-section,
body.dark-mode .history-section {
    background: #2d2d2d;
    color: #e0e0e0;
}

body.dark-mode .homework-content {
    background: #3a3a3a;
    border-left-color: #4a90e2;
}

body.dark-mode .section-title {
    color: #4a90e2;
    border-bottom-color: #555;
}

body.dark-mode .bold-text {
    color: #ffffff;
}

body.dark-mode .app-link {
    color: #4a90e2;
}

body.dark-mode .app-link:hover {
    color: #7bb4ff;
}

.dark-mode-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    z-index: 1000;
}

body.dark-mode .dark-mode-toggle {
    background: rgba(0, 0, 0, 0.2);
    color: #ffa500;
}

.dark-mode-toggle:hover {
    transform: scale(1.1);
    background: rgba(255, 255, 255, 0.2);
}

body.dark-mode .changes-section {
    background: #2d2d2d;
}

body.dark-mode .change-entry {
    background: #3a3a3a;
    border-left-color: #4a90e2;
}

body.dark-mode .change-date {
    color: #aaa;
}

body.dark-mode .change-content {
    color: #e0e0e0;
}

body.dark-mode .no-changes {
    color: #aaa;
}

.app-link.hidden {
    display: none;
}

.changes-section {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.changes-content {
    margin-top: 10px;
}

.no-changes {
    color: #666;
    font-style: italic;
    text-align: center;
    padding: 10px;
}

.changes-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.change-entry {
    padding: 12px;
    background: #f8f9fa;
    border-radius: 6px;
    border-left: 3px solid #2575fc;
}

.change-date {
    display: block;
    font-style: italic;
    color: #666;
    font-size: 0.9em;
    margin-bottom: 4px;
}

.change-content {
    display: block;
    color: #333;
    line-height: 1.4;
}