:root {
    --primary-blue: #6A9FB5;
    --secondary-blue: #8BB4C5;
    --light-blue: #E1F0F7;
    --accent-blue: #4A7B9D;
    --text-dark: #2C3E50;
    --text-light: #7F8C8D;
    --card-shadow: 0 4px 12px rgba(106, 159, 181, 0.15);
}

/* 学习路径区域 */
.learning-path-section {
    background: linear-gradient(135deg, var(--light-blue), #D4E9F2);
    padding: 2rem 0;
    border-radius: 0 0 20px 20px;
    margin-bottom: 2rem;
}

.section-title {
    color: var(--accent-blue);
    font-weight: 600;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
    font-size: 28px;
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--primary-blue);
    border-radius: 2px;
}

/* 专业选择器 */
.major-selector {
    position: relative;
    margin-bottom: 2rem;
}

.major-selector label {
    font-weight: 600;
    color: var(--accent-blue);
    margin-bottom: 0.5rem;
    display: block;
}

.major-selector select {
    appearance: none;
    background-color: white;
    border: 2px solid var(--primary-blue);
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    color: var(--text-dark);
    width: 100%;
    max-width: 300px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.major-selector select:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(106, 159, 181, 0.3);
    border-color: var(--accent-blue);
}

.major-selector::after {
    content: '\f078';
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    position: absolute;
    top: 50%;
    right: 1rem;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--primary-blue);
}

/* 学习路径流程图 */
.path-flow {
    background-color: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--card-shadow);
    overflow-x: auto;
    position: relative;
}

.path-container {
    display: flex;
    min-width: 900px;
    position: relative;
}

.path-step {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    padding: 0 1rem;
}

.step-connector {
    position: absolute;
    top: 40px;
    left: -50%;
    width: 100%;
    height: 2px;
    background-color: var(--primary-blue);
    z-index: 1;
}

.step-node {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-color: var(--light-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    position: relative;
    z-index: 2;
    transition: all 0.3s ease;
    cursor: pointer;
}

.step-node:hover {
    transform: scale(1.05);
    background-color: var(--primary-blue);
}

.step-node:hover .step-icon {
    color: white;
}

.step-icon {
    font-size: 1.8rem;
    color: var(--accent-blue);
}

.step-content {
    text-align: center;
    width: 100%;
}

.step-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--accent-blue);
}

.step-courses {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.step-progress {
    height: 6px;
    background-color: #e9ecef;
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.step-progress-bar {
    height: 100%;
    background-color: var(--primary-blue);
    border-radius: 3px;
    transition: width 0.5s ease;
}

.step-status {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* 阶段状态样式 */
.step-completed .step-node {
    background-color: var(--primary-blue);
}

.step-completed .step-icon {
    color: white;
}

.step-active .step-node {
    background-color: var(--accent-blue);
    box-shadow: 0 0 0 4px rgba(74, 123, 157, 0.3);
}

.step-active .step-icon {
    color: white;
}

/* 课程详情面板 */
.course-panel {
    display: none;
    background-color: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--card-shadow);
    margin-top: 1.5rem;
}

.course-panel.active {
    display: block;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #e9ecef;
}

.panel-title {
    font-weight: 600;
    color: var(--accent-blue);
    margin: 0;
}

.close-panel {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--text-light);
    cursor: pointer;
}

.course-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

.course-item {
    display: flex;
    align-items: center;
    padding: 0.75rem;
    border-radius: 8px;
    border: 1px solid #e9ecef;
    transition: all 0.3s ease;
}

.course-item:hover {
    border-color: var(--primary-blue);
    box-shadow: 0 2px 8px rgba(106, 159, 181, 0.15);
}

.course-check {
    margin-right: 0.75rem;
    color: #28a745;
}

.course-info {
    flex: 1;
}

.course-name {
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.course-duration {
    font-size: 0.8rem;
    color: var(--text-light);
}

.course-action {
    margin-left: 0.75rem;
}