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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f5f5f5;
    padding: 10px;
}

#chat-container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    padding: 15px;
}

#chat-messages {
    height: 300px;
    overflow-y: auto;
    margin-bottom: 20px;
    padding: 10px;
    border: 1px solid #eee;
}

.input-container {
    display: flex;
    gap: 10px;
}

#message-input {
    flex: 1;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

#send-button {
    padding: 8px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.sent-message {
    background-color: #e3f2fd;
    padding: 8px;
    margin: 5px 0;
    border-radius: 4px;
}

.received-message {
    background-color: #f5f5f5;
    padding: 8px;
    margin: 5px 0;
    border-radius: 4px;
}

.other-user-message {
    text-align: left;
    background-color: #e8e8e8;
    padding: 5px;
    border-radius: 5px;
    margin-bottom: 5px;
}

.date-selector {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 15px;
    padding: 10px;
    background-color: #f8f9fa;
    border-radius: 8px;
}

#date-picker {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
}

#check-records {
    width: 100%;
    padding: 12px;
    background-color: #2196F3;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

#check-records:active {
    background-color: #1976D2;
}

#records-display {
    margin-top: 15px;
    background-color: #fff;
    border-radius: 8px;
    overflow: hidden;
}

.records-summary {
    padding: 15px;
}

.records-summary h3 {
    margin-bottom: 15px;
    color: #333;
    font-size: 18px;
    font-weight: 600;
}

.records-summary ul {
    list-style: none;
}

.records-summary li {
    padding: 12px 0;
    border-bottom: 1px solid #eee;
    font-size: 16px;
    line-height: 1.4;
}

.records-summary li:last-child {
    border-bottom: none;
}

/* 针对不同屏幕尺寸的响应式设计 */
@media (min-width: 768px) {
    .date-selector {
        flex-direction: row;
        align-items: center;
    }

    #date-picker {
        flex: 1;
    }

    #check-records {
        width: auto;
        padding: 12px 24px;
    }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #121212;
        color: #fff;
    }

    #chat-container {
        background-color: #1e1e1e;
        box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    }

    .date-selector {
        background-color: #2d2d2d;
    }

    #date-picker {
        background-color: #333;
        color: #fff;
        border-color: #444;
    }

    .records-summary h3 {
        color: #fff;
    }

    .records-summary li {
        border-bottom-color: #333;
    }

    #records-display {
        background-color: #1e1e1e;
    }
}

/* 添加触摸反馈 */
@media (hover: hover) {
    #check-records:hover {
        background-color: #1976D2;
    }
}

/* 优化可访问性 */
#check-records:focus {
    outline: 3px solid rgba(33, 150, 243, 0.5);
    outline-offset: 2px;
}

/* 优化加载状态 */
.loading {
    text-align: center;
    padding: 20px;
    color: #666;
}

/* 错误状态样式 */
.error-message {
    color: #f44336;
    padding: 15px;
    text-align: center;
    background-color: rgba(244, 67, 54, 0.1);
    border-radius: 8px;
    margin: 10px 0;
}