/* calculus.css - AP Calculus 目录页专属样式 */

.course-main {
    padding-top: 100px; /* 避免内容被固定的页头遮挡 */
    padding-bottom: 4rem;
    min-height: 100vh;
}

.course-title {
    text-align: center;
    margin-bottom: 2rem;
}

/* 学习进度跟踪器样式 */
.progress-tracker {
    background-color: var(--card-bg-light);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 3rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

body.dark-mode .progress-tracker {
    background-color: var(--card-bg-dark);
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.progress-tracker h3 {
    margin: 0 0 1rem 0;
    text-align: center;
}

.progress-bar-container {
    width: 100%;
    height: 12px;
    background-color: var(--border-color-light);
    border-radius: 6px;
    overflow: hidden;
}

body.dark-mode .progress-bar-container {
    background-color: var(--border-color-dark);
}

.progress-bar {
    width: 0%; /* 初始宽度为0, 通过JS更新 */
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 6px;
    transition: width 0.5s ease;
}

.progress-text {
    display: block;
    text-align: center;
    margin-top: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 章节列表样式 */
.chapter-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chapter-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--card-bg-light);
    border: 1px solid var(--border-color-light);
    border-radius: 10px;
    padding: 1rem 1.5rem;
    transition: box-shadow 0.3s, border-color 0.3s;
}

.chapter-item:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
}

body.dark-mode .chapter-item {
    background-color: var(--card-bg-dark);
    border-color: var(--border-color-dark);
}
body.dark-mode .chapter-item:hover {
     box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}


.chapter-item.completed {
    border-left: 5px solid var(--primary-color);
}
.chapter-item.completed label {
    text-decoration: line-through;
    opacity: 0.6;
}

.chapter-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.chapter-checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

.chapter-info label {
    font-weight: 500;
    cursor: pointer;
}

.chapter-actions {
    display: flex;
    gap: 0.5rem;
}

/* 针对目录页的小尺寸按钮 */
.btn-small {
    padding: 6px 16px;
    font-size: 0.9rem;
    margin-top: 0;
}

/* 次要按钮样式 */
.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    box-shadow: none;
}
.btn-secondary:hover {
    background-color: var(--primary-color);
    color: #fff;
}


/* 移动端响应式设计 */
@media (max-width: 768px) {
    .course-main {
        padding-top: 80px;
    }
    .chapter-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    .chapter-actions {
        width: 100%;
        display: grid;
        grid-template-columns: 1fr 1fr;
    }
}

.progress-container {
    margin-bottom: 2rem;
}

.quick-access-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
    margin-bottom: 2rem;
}

.quick-access-buttons .btn {
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 500;
    transition: background-color 0.3s, transform 0.2s;
    background-color: var(--primary-color);
    color: white;
}

.quick-access-buttons .btn-secondary {
    background-color: var(--secondary-btn-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.quick-access-buttons .btn:hover {
    transform: translateY(-2px);
}


h2 {
    text-align: center;
    margin-bottom: 1.5rem;
}