/* ===== 课程中心 - 卡片式布局 ===== */

.course-center {
    padding: 16px;
}

.course-center-header {
    margin-bottom: 20px;
}

.course-center-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.course-center-subtitle {
    font-size: 14px;
    color: var(--text2);
}

/* 课程系列卡片网格 */
.course-series-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

/* 课程系列卡片 */
.course-series-card {
    background: var(--card);
    border-radius: 16px;
    padding: 16px;
    box-shadow: var(--shadow-sm);
    border: 0.5px solid var(--border2);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.course-series-card:active {
    transform: scale(0.98);
}

.course-series-card.active {
    border-color: var(--primary);
    box-shadow: 0 2px 12px rgba(0,113,227,0.15);
}

.course-series-card.coming-soon {
    opacity: 0.7;
}

.course-series-card.locked {
    opacity: 0.5;
}

/* 卡片图标 */
.series-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 12px;
}

/* 卡片标题 */
.series-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}

/* 卡片描述 */
.series-desc {
    font-size: 12px;
    color: var(--text2);
    margin-bottom: 12px;
    line-height: 1.4;
}

/* 进度条 */
.series-progress {
    margin-bottom: 8px;
}

.progress-bar {
    height: 4px;
    background: var(--bg2);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 4px;
}

.progress-fill {
    height: 100%;
    border-radius: 2px;
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 11px;
    color: var(--text3);
    font-family: var(--ff-mono);
}

/* 标签 */
.series-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.series-tag {
    font-size: 10px;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 500;
    background: var(--tag-bg);
    color: var(--primary);
}

.series-tag.hot {
    background: rgba(255,59,48,0.1);
    color: var(--red);
}

.series-tag.tech {
    background: rgba(52,199,89,0.1);
    color: var(--green);
}

.series-tag.data {
    background: rgba(255,149,0,0.1);
    color: var(--orange);
}

.series-tag.design {
    background: rgba(255,45,85,0.1);
    color: #ff2d55;
}

.series-tag.business {
    background: rgba(88,86,214,0.1);
    color: #5856d6;
}

/* 状态标识 */
.series-status {
    position: absolute;
    top: 12px;
    right: 12px;
    font-size: 10px;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
}

.series-status.active {
    background: rgba(0,113,227,0.1);
    color: var(--primary);
}

.series-status.coming-soon {
    background: rgba(255,149,0,0.1);
    color: var(--orange);
}

.series-status.locked {
    background: var(--bg2);
    color: var(--text3);
}

/* 课程详情区域 */
.course-detail {
    background: var(--card);
    border-radius: 16px;
    padding: 16px;
    box-shadow: var(--shadow-sm);
    border: 0.5px solid var(--border2);
    margin-bottom: 16px;
}

.course-detail-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 0.5px solid var(--border);
}

.course-detail-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.course-detail-info {
    flex: 1;
}

.course-detail-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 2px;
}

.course-detail-desc {
    font-size: 13px;
    color: var(--text2);
}

.course-detail-progress {
    text-align: right;
}

.course-detail-percent {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    font-family: var(--ff-mono);
}

.course-detail-count {
    font-size: 11px;
    color: var(--text3);
}

/* 模块列表 */
.course-modules {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.course-module {
    background: var(--bg);
    border-radius: 12px;
    padding: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.course-module:active {
    transform: scale(0.98);
}

.course-module-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.course-module-icon {
    font-size: 18px;
}

.course-module-info {
    flex: 1;
}

.course-module-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

.course-module-subtitle {
    font-size: 11px;
    color: var(--text3);
}

.course-module-progress {
    font-size: 12px;
    color: var(--text2);
    font-family: var(--ff-mono);
}

/* 课程列表 */
.course-lessons {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 0.5px solid var(--border);
}

.course-lesson {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
}

.course-lesson-check {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: transparent;
}

.course-lesson-check.completed {
    background: var(--green);
    border-color: var(--green);
    color: white;
}

.course-lesson-check.current {
    border-color: var(--primary);
    color: var(--primary);
}

.course-lesson-info {
    flex: 1;
}

.course-lesson-title {
    font-size: 13px;
    color: var(--text);
}

.course-lesson-time {
    font-size: 11px;
    color: var(--text3);
}

.course-lesson-status {
    font-size: 11px;
    color: var(--text3);
}

.course-lesson-status.completed {
    color: var(--green);
}

.course-lesson-status.current {
    color: var(--primary);
    font-weight: 600;
}

/* 返回按钮 */
.back-to-center {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--primary);
    cursor: pointer;
    margin-bottom: 16px;
    padding: 8px 0;
}

.back-to-center:hover {
    opacity: 0.8;
}

/* 课程操作区域 */
.lesson-actions {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 0.5px solid var(--border);
}

.lesson-section-title {
    font-size: 12px;
    color: var(--text3);
    margin-bottom: 12px;
    font-weight: 500;
}

/* 响应式布局 */
@media (max-width: 360px) {
    .course-series-grid {
        grid-template-columns: 1fr;
    }
}