/* 核心课程页面 */
.main-container {
    max-width: 1100px;
    margin: auto;
    padding: 2rem;
}

.section-title {
    text-align: center;
    color: #2A3950;
    font-size: 2rem;
    margin-bottom: 1rem;
}

.course-intro,.course-position p {
    text-align: justify;
    font-size: 1.1rem;
    color: #555;
    hyphens: auto;
    padding: 0 2rem;
}


/* 课程目标 */
.course-goals ul {
    list-style: none;
    padding: 0;
    text-align: center;
}

.course-goals li {
    font-size: 1.1rem;
    margin: 10px 0;
    color: #555;
}

.course-goals li i {
    color: #2A3950;
    margin-right: 10px;
}

/* 课程结构 */
.course-structure {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    max-width: 1100px;
    margin: auto;
}

.course-text {
    flex: 1;
    text-align: left;
    min-width: 300px;
}

.course-image {
    flex: 1;
    max-width: 500px;
}

.course-image img {
    width: 100%;
    border-radius: 10px;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: #2A3950;
    color: white;
    border-radius: 5px;
    text-decoration: none;
    margin-top: 10px;
}

.btn:hover {
    background-color: #1E2B40;
}

/* 页脚 */
footer {
    text-align: center;
    padding: 1rem;
    background-color: #2A3950;
    color: white;
}

/* 课程卡片系统 */
.course-structure-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.course-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: var(--transition);
}

.course-card:hover {
    transform: translateY(-5px);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.card-icon i {
    color: white;
    font-size: 1.8rem;
}

.course-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.course-card ul {
    padding-left: 1.5rem;
}

.course-card li {
    margin: 0.8rem 0;
    color: #444;
    position: relative;
}

.course-card li::before {
    content: "•";
    color: var(--accent-color);
    font-weight: bold;
    display: inline-block;
    width: 1em;
    margin-left: -1em;
}

/* 课程设计图文布局优化 */
.course-design .course-structure {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}

.course-text .btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background: var(--accent-color);
    color: white;
    border-radius: 30px;
    text-decoration: none;
    margin-top: 1.5rem;
    transition: var(--transition);
}

.course-text .btn:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

.course-image img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 8px;
}

/* 响应式优化 */
@media (max-width: 768px) {
    .course-structure-grid {
        grid-template-columns: 1fr;
    }

    .course-design .course-structure {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .course-image img {
        height: 200px;
    }
}

/* 次级标题 */
h2 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin: 4rem 0 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #eee;
    position: relative;
}