/* 特色功能详情页特有样式 */

/* 页面头部特殊样式 */
.features-header {
    background: linear-gradient(135deg, 
        rgba(10, 14, 23, 0.95) 0%, 
        rgba(30, 20, 50, 0.85) 100%);
}

/* 功能概览 */
.features-overview {
    padding: var(--space-xxl) 0;
    background: linear-gradient(180deg, 
        transparent 0%, 
        rgba(0, 217, 255, 0.05) 100%);
}

.intro-text {
    margin: 0 auto;
}

.intro-text p {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-bottom: var(--space-lg);
    color: var(--color-text-secondary);
}

/* 功能详情卡片 */
.feature-detail-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-xxl);
    margin-bottom: var(--space-xxl);
    position: relative;
    overflow: hidden;
}

.feature-detail-card:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, 
        var(--color-accent-blue), 
        var(--color-accent-purple));
}

.feature-header {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.feature-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, 
        var(--color-accent-blue), 
        var(--color-accent-purple));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.feature-header h2 {
    font-size: 2.2rem;
    margin: 0;
    color: var(--color-accent-cyan);
}

.feature-header h2:after {
    display: none;
}

.feature-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xxl);
    align-items: start;
}

.feature-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

/* 规格网格 */
.specs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.spec-card {
    background: rgba(0, 217, 255, 0.05);
    border: 1px solid rgba(0, 217, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    text-align: center;
    transition: all var(--transition-regular);
}

.spec-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-blue);
    box-shadow: 0 5px 20px rgba(0, 217, 255, 0.2);
}

.spec-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, 
        var(--color-accent-blue), 
        var(--color-accent-purple));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-md);
}

.spec-icon i {
    color: white;
    font-size: 1.5rem;
}

.spec-card h4 {
    font-size: 1.1rem;
    margin-bottom: var(--space-xs);
    color: var(--color-text-primary);
}

.spec-card p {
    font-size: 0.9rem;
    margin: 0;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* 前后对比 */
.before-after {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-xl);
    margin-top: var(--space-lg);
}

.before, .after {
    flex: 1;
    text-align: center;
}

.before h4, .after h4 {
    font-size: 1.1rem;
    margin-bottom: var(--space-md);
    color: var(--color-text-secondary);
}

.visual-placeholder {
    height: 200px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
    transition: all var(--transition-regular);
}

.after .visual-placeholder {
    border-color: var(--color-accent-blue);
    background: linear-gradient(135deg, 
        rgba(0, 217, 255, 0.1) 0%, 
        rgba(138, 43, 226, 0.1) 100%);
}

.visual-placeholder.hologram {
    position: relative;
    overflow: hidden;
}

.visual-placeholder.hologram:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: conic-gradient(
        from 0deg at 50% 50%,
        var(--color-accent-blue) 0deg,
        var(--color-accent-cyan) 60deg,
        var(--color-accent-purple) 120deg,
        var(--color-accent-blue) 180deg,
        var(--color-accent-cyan) 240deg,
        var(--color-accent-purple) 300deg,
        var(--color-accent-blue) 360deg
    );
    opacity: 0.1;
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.visual-placeholder i {
    font-size: 3rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    z-index: 1;
}

.after .visual-placeholder i {
    color: var(--color-accent-cyan);
}

.visual-placeholder p {
    font-size: 0.9rem;
    margin: 0;
    color: var(--color-text-muted);
    z-index: 1;
}

.after .visual-placeholder p {
    color: var(--color-accent-cyan);
}

.arrow {
    color: var(--color-accent-blue);
    font-size: 2rem;
    opacity: 0.7;
}

/* 延迟演示 */
.latency-demo {
    margin-top: var(--space-xl);
    padding: var(--space-lg);
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.latency-demo h4 {
    color: var(--color-accent-cyan);
    margin-bottom: var(--space-lg);
    font-size: 1.1rem;
    text-align: center;
}

.latency-bars {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.latency-bar {
    position: relative;
}

.bar-label {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xs);
    display: block;
}

.bar-container {
    width: 100%;
    height: 30px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-round);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.bar-fill {
    height: 100%;
    border-radius: var(--radius-round);
    position: relative;
    transition: width 1.5s ease-out;
}

.traditional .bar-fill {
    background: linear-gradient(90deg, 
        rgba(255, 255, 255, 0.3) 0%, 
        rgba(255, 255, 255, 0.5) 100%);
}

.hologram .bar-fill {
    background: linear-gradient(90deg, 
        var(--color-accent-blue) 0%, 
        var(--color-accent-cyan) 100%);
}

.latency-value {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-primary);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

/* 远程课堂演示 */
.remote-class-demo {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.teacher-site, .student-site {
    text-align: center;
    flex: 1;
}

.site-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, 
        rgba(0, 217, 255, 0.2) 0%, 
        rgba(138, 43, 226, 0.2) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-md);
    border: 2px solid var(--color-accent-blue);
}

.site-icon i {
    font-size: 3rem;
    color: var(--color-accent-cyan);
}

.teacher-site p, .student-site p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin: 0;
}

.connection {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    flex: 2;
}

.connection-line {
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, 
        transparent, 
        var(--color-accent-blue), 
        transparent);
    position: relative;
}

.connection-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, 
        var(--color-accent-blue), 
        var(--color-accent-purple));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--color-primary-dark);
    box-shadow: 0 0 10px var(--color-accent-blue);
    animation: pulse-glow 2s ease-in-out infinite;
}

.connection-icon i {
    color: white;
    font-size: 1.2rem;
}

.connection-label {
    font-size: 0.8rem;
    color: var(--color-accent-blue);
    font-weight: 600;
    text-align: center;
    background: rgba(0, 217, 255, 0.1);
    padding: 2px 8px;
    border-radius: var(--radius-round);
    border: 1px solid rgba(0, 217, 255, 0.3);
}

/* 技术对比表格 */
.tech-comparison {
    padding: var(--space-xxl) 0;
    background: linear-gradient(180deg, 
        rgba(0, 217, 255, 0.05) 0%, 
        transparent 100%);
}

.comparison-table {
    background: var(--color-card-bg);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    overflow: hidden;
    margin-top: var(--space-xl);
}

.table-header {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    background: linear-gradient(90deg, 
        rgba(0, 217, 255, 0.1) 0%, 
        rgba(138, 43, 226, 0.1) 100%);
    border-bottom: 1px solid var(--color-border);
}

.header-cell {
    padding: var(--space-lg);
    font-weight: 600;
    color: var(--color-accent-cyan);
    text-align: center;
}

.header-cell.feature {
    text-align: left;
    border-right: 1px solid var(--color-border);
}

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

.table-row:hover {
    background: rgba(0, 217, 255, 0.05);
}

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

.row-cell {
    padding: var(--space-lg);
    color: var(--color-text-secondary);
    text-align: center;
    border-right: 1px solid var(--color-border);
}

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

.row-cell.feature {
    text-align: left;
    color: var(--color-text-primary);
    font-weight: 500;
}

.row-cell.traditional {
    color: var(--color-text-muted);
}

.row-cell.hologram {
    color: var(--color-accent-cyan);
    font-weight: 500;
}

/* 演示视频区域 */
.demo-video {
    padding: var(--space-xxl) 0;
}

.video-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-xl);
}

.video-placeholder {
    position: relative;
    height: 400px;
    background: linear-gradient(135deg, 
        rgba(0, 0, 0, 0.3) 0%, 
        rgba(0, 0, 0, 0.5) 100%);
    border-radius: var(--radius-xl);
    border: 2px solid var(--color-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-regular);
}

.video-placeholder:hover {
    border-color: var(--color-accent-blue);
    box-shadow: 0 0 30px rgba(0, 217, 255, 0.3);
    transform: translateY(-5px);
}

.video-placeholder:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect width="100" height="100" fill="none"/><path d="M20,20 L20,80 L80,50 Z" fill="%2300d9ff"/></svg>') center/20% no-repeat;
    opacity: 0.3;
}

.video-placeholder i {
    font-size: 5rem;
    color: var(--color-accent-cyan);
    margin-bottom: var(--space-md);
    z-index: 1;
    opacity: 0.8;
}

.video-placeholder p {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin: 0;
    z-index: 1;
}

.video-description h3 {
    color: var(--color-accent-cyan);
    margin-bottom: var(--space-md);
    font-size: 1.5rem;
}

.video-description p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-xl);
}

.video-chapters {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.chapter {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chapter:hover {
    background: rgba(0, 217, 255, 0.1);
    border-color: var(--color-accent-blue);
    transform: translateX(5px);
}

.chapter-time {
    font-size: 0.9rem;
    color: var(--color-accent-blue);
    font-weight: 600;
    min-width: 80px;
}

.chapter-title {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    flex: 1;
}

/* 响应式调整 */
@media (max-width: 992px) {
    .feature-content {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .specs-grid {
        grid-template-columns: 1fr;
    }
    
    .video-container {
        grid-template-columns: 1fr;
    }
    
    .table-header,
    .table-row {
        grid-template-columns: 1fr;
    }
    
    .header-cell,
    .row-cell {
        border-right: none;
        border-bottom: 1px solid var(--color-border);
        text-align: center;
    }
    
    .header-cell:last-child,
    .row-cell:last-child {
        border-bottom: none;
    }
    
    .header-cell.feature,
    .row-cell.feature {
        text-align: center;
    }
}

@media (max-width: 768px) {
    .feature-detail-card {
        padding: var(--space-xl);
    }
    
    .feature-header {
        flex-direction: column;
        text-align: center;
        gap: var(--space-md);
    }
    
    .before-after {
        flex-direction: column;
    }
    
    .remote-class-demo {
        flex-direction: column;
        text-align: center;
    }
    
    .connection {
        flex-direction: row;
        justify-content: center;
        width: 100%;
    }
    
    .connection-line {
        width: 2px;
        height: 50px;
        background: linear-gradient(180deg, 
            transparent, 
            var(--color-accent-blue), 
            transparent);
    }
}