.page-header {
    font-family: "Georgia", "Times New Roman", serif; /* Similar to the UCSD style */
    font-size: 2em; /* Adjust size to match */
    /* font-weight: bold; */
    color: #042b50; /* UC San Diego navy blue color */
    text-align: left;
    padding: 20px 0;
    margin-bottom: 15px;
    border-bottom: 2px solid #FFC72C; /* Golden yellow line similar to the UCSD style */
    margin-left: 20px; /* Align header to the left */
}

/* 大容器，用于包裹所有输入框、开关和按钮 */
.course-tab {
    margin: 0 auto;    /* 居中对齐 */
    align-items: center;
    padding: 7px;
    max-width: 1200px; /* 设置最大宽度 */
}

/* Add Course 和 Switch Charts 按钮 */
.button-container {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 20px auto;
}

#add-course-btn,
#ratio-display-btn {
    padding: 10px 20px;
    font-size: 16px;
    font-weight: bold;
    background-color: #3b5998;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#add-course-btn:hover,
#ratio-display-btn:hover {
    background-color: #2a4175;
}


.line-chart-container {
    margin: 0 auto;    /* 居中对齐 */
    align-items: center;
    max-width: 1500px;
    max-height: 1500px;
    height: 100%;
    width: 100%;
    margin-bottom: 50px; /* Adjust as needed to provide space for the footer */
}

.chart-note {
    font-size: 13px;
    color: #666;
    margin-top: 2%;
    margin-left: auto; /* Centers in the container */
    max-width: 1650px;
    padding-left: 15px; /* Aligns text with .line-chart-container */
}

.page-footer {
    font-family: Arial, sans-serif;
    font-size: 0.9em;
    color: #666;
    background-color: #f1f1f1;
    text-align: center;
    padding: 15px 0;
    border-top: 1px solid #ccc;
    position: relative;
    bottom: 0;
    width: 100%;
    z-index: 10;
}

.page-footer p {
    margin: 5px 0;
}


/* 响应式布局：当屏幕宽度小于600px时，调整为垂直排列 */
@media (max-width: 600px) {
    .unit-container {
        flex-direction: column;
        align-items: stretch;
    }
}