/* 课程页面专用样式 */
@import url('styles.css');

/* 课程头部 */
.course-header {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.course-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 40%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(6, 182, 212, 0.1) 0%, transparent 50%);
}

.course-header-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.course-breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.course-breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.course-breadcrumb a:hover {
    color: var(--primary-light);
}

.course-header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.course-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.course-highlights {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.highlight-item i {
    color: var(--primary-color);
    font-size: 1rem;
}

.course-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* 课程概述 */
.course-overview {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.overview-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    transition: all var(--transition-normal);
}

.overview-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-hover);
}

.overview-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 1.5rem;
    color: white;
}

.overview-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.overview-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 课程大纲区域 */
.course-outline-section {
    padding: 100px 0;
    background: var(--bg-primary);
}

.stage-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    margin-bottom: 3rem;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.stage-card:hover {
    box-shadow: var(--shadow-xl);
    border-color: var(--border-hover);
}

.stage-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    position: relative;
}

.stage-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.05) 100%);
}

.stage-number {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    backdrop-filter: blur(10px);
    flex-shrink: 0;
}

.stage-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stage-info p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.875rem;
}

.stage-meta {
    margin-left: auto;
    text-align: right;
}

.stage-duration,
.stage-lessons {
    display: block;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0.25rem;
}

.lessons-grid {
    padding: 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.lesson-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.lesson-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-primary);
    transform: scaleY(0);
    transition: transform var(--transition-normal);
}

.lesson-card:hover::before {
    transform: scaleY(1);
}

.lesson-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.lesson-number {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 30px;
    height: 30px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
}

.lesson-content h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    padding-right: 3rem;
}

.lesson-content ul {
    list-style: none;
    padding: 0;
}

.lesson-content li {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    line-height: 1.5;
    position: relative;
    padding-left: 1rem;
}

.lesson-content li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.lesson-content li strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* 学习成果 */
.learning-outcomes {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.outcomes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.outcome-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all var(--transition-normal);
}

.outcome-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-hover);
}

.outcome-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    color: white;
}

.outcome-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.outcome-card ul {
    list-style: none;
    padding: 0;
}

.outcome-card li {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
    line-height: 1.5;
    position: relative;
    padding-left: 1.5rem;
}

.outcome-card li::before {
    content: '✅';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-size: 0.75rem;
}

/* 学习路径 */
.learning-path {
    padding: 100px 0;
    background: var(--bg-primary);
}

.path-table {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.path-table-header {
    display: grid;
    grid-template-columns: 1fr 2fr 2fr;
    background: var(--gradient-primary);
    color: white;
}

.path-cell {
    padding: 1rem 1.5rem;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.path-cell:last-child {
    border-right: none;
}

.header-cell {
    font-weight: 600;
    text-align: center;
}

.path-row {
    display: grid;
    grid-template-columns: 1fr 2fr 2fr;
    border-bottom: 1px solid var(--border-color);
}

.path-row:last-child {
    border-bottom: none;
}

.path-row:hover {
    background: rgba(99, 102, 241, 0.05);
}

.path-row .path-cell {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* 行动召唤 */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta-content p {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .stage-header {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .stage-meta {
        margin-left: 0;
        text-align: center;
    }

    .lessons-grid {
        grid-template-columns: 1fr;
    }

    .course-header h1 {
        font-size: 2.5rem;
    }

    .course-highlights {
        flex-direction: column;
        gap: 1rem;
    }

    .path-table {
        font-size: 0.875rem;
    }

    .path-cell {
        padding: 0.75rem 1rem;
    }
}

@media (max-width: 768px) {
    .course-header {
        padding: 100px 0 60px;
    }

    .course-header h1 {
        font-size: 2rem;
    }

    .course-subtitle {
        font-size: 1rem;
    }

    .overview-grid {
        grid-template-columns: 1fr;
    }

    .outcomes-grid {
        grid-template-columns: 1fr;
    }

    .stage-header {
        padding: 1.5rem;
    }

    .stage-info h3 {
        font-size: 1.25rem;
    }

    .lessons-grid {
        padding: 1.5rem;
        gap: 1rem;
    }

    .lesson-card {
        padding: 1rem;
    }

    .lesson-content h4 {
        font-size: 1rem;
    }

    .cta-content h2 {
        font-size: 2rem;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .course-actions {
        flex-direction: column;
        align-items: center;
    }

    .path-table {
        font-size: 0.75rem;
    }

    .path-cell {
        padding: 0.5rem 0.75rem;
    }

    .path-row {
        grid-template-columns: 1fr;
    }

    .path-row .path-cell {
        text-align: left;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        position: relative;
    }

    .path-row .path-cell::before {
        content: attr(data-label) ': ';
        font-weight: 600;
        color: var(--text-primary);
    }

    .path-row .path-cell:first-child::before {
        content: '角色: ';
    }

    .path-row .path-cell:nth-child(2)::before {
        content: '推荐模块: ';
    }

    .path-row .path-cell:nth-child(3)::before {
        content: '目标产出: ';
    }

    .path-row .path-cell:last-child {
        border-bottom: none;
    }
}