/* ===================================
   课程相关样式
   =================================== */

/* 课程网格 */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

/* 课程卡片 */
.course-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 50px rgba(44, 95, 127, 0.2);
    border-color: var(--primary);
}

.course-card-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--primary) 0%, #1a4a6a 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.course-card-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

.course-card-overlay {
    position: absolute;
    top: 15px;
    right: 15px;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
}

.course-card-badge {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: #fff;
    padding: 5px 12px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 3px;
    backdrop-filter: blur(5px);
    letter-spacing: 0.1em;
}

.course-card-badge--weekly {
    background: rgba(192, 96, 48, 0.92);
    color: #fff8f0;
    letter-spacing: 0.08em;
}

.course-card-icon {
    font-size: 4rem;
    position: relative;
    z-index: 1;
}

.course-card-content {
    padding: 30px;
}

.course-card-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--primary);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.course-card-title {
    font-family: 'Crimson Pro', serif;
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
    line-height: 1.3;
}

.course-card-weekly-note {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    color: #a04828;
    margin: 0 0 12px;
    padding: 4px 0;
    border-bottom: 1px solid rgba(192, 96, 48, 0.2);
    display: inline-block;
    width: 100%;
}

.course-card-desc {
    font-size: 1rem;
    color: var(--gray);
    line-height: 1.6;
    margin-bottom: 20px;
}

.course-card-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    font-size: 0.9rem;
    color: var(--gray);
}

.course-card-hours,
.course-card-credit {
    padding: 4px 10px;
    background: var(--light);
    border-radius: 3px;
}

.course-card-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* 课程详情页 */
.course-header {
    text-align: center;
    padding: 80px 0 60px;
    border-bottom: 1px solid var(--border);
}

.course-header-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--primary);
    letter-spacing: 0.3em;
    text-transform: uppercase;
    margin-bottom: 20px;
}

.course-header-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    margin-bottom: 20px;
}

.course-header-subtitle {
    font-size: 1.3rem;
    color: var(--gray);
    margin-bottom: 30px;
}

.course-info-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin: 60px 0;
}

.course-info-item {
    text-align: center;
    padding: 25px;
    background: var(--light);
    border-radius: 8px;
}

.course-info-number {
    font-family: 'Crimson Pro', serif;
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 10px;
}

.course-info-label {
    font-size: 0.9rem;
    color: var(--gray);
}

/* 课程大纲 */
.syllabus-item {
    background: #fff;
    border: 1px solid var(--border);
    border-left: 4px solid var(--primary);
    padding: 25px 30px;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.syllabus-item:hover {
    border-left-color: var(--accent);
    box-shadow: 0 4px 15px rgba(44, 95, 127, 0.1);
}

.syllabus-week {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--primary);
    margin-bottom: 10px;
}

.syllabus-title {
    font-size: 1.3rem;
    font-weight: 500;
    color: var(--dark);
    margin-bottom: 10px;
}

.syllabus-desc {
    color: var(--gray);
    line-height: 1.6;
}

/* 资源列表 */
.resource-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.resource-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.3s ease;
    text-decoration: none;
    color: inherit;
}

.resource-item:hover {
    border-color: var(--primary);
    transform: translateX(5px);
}

.resource-icon {
    font-size: 2rem;
}

.resource-info {
    flex: 1;
}

.resource-title {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--dark);
    margin-bottom: 5px;
}

.resource-desc {
    font-size: 0.9rem;
    color: var(--gray);
}

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

    .course-header {
        padding: 60px 0 40px;
    }

    .course-info-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .resource-list {
        grid-template-columns: 1fr;
    }
}