/* 特性页头部 */
.features-header {
    background: linear-gradient(to bottom, var(--bg-darker), var(--bg-dark));
    padding: 6rem 0 3rem;
    text-align: center;
}

.features-header h1 {
    margin-bottom: 1rem;
}

.features-header p {
    max-width: 700px;
    margin: 0 auto;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* 功能导航 */
.features-nav {
    background: var(--bg-darker);
    position: sticky;
    top: var(--header-height);
    z-index: 100;
    padding: 0.5rem 0;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.features-nav-list {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
    justify-content: center;
    flex-wrap: wrap;
}

.features-nav-list li {
    margin: 0;
}

.features-nav-list a {
    display: block;
    padding: 0.75rem 1.25rem;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.features-nav-list a:hover,
.features-nav-list a.active {
    color: var(--primary-color);
}

.features-nav-list a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 2px;
    background: var(--primary-color);
    border-radius: var(--radius-full);
}

/* 特性部分共通样式 */
.feature-section {
    padding: 4rem 0;
    position: relative;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.feature-section:last-child {
    border-bottom: none;
}

.feature-section .container {
    display: flex;
    align-items: center;
    gap: 3rem;
}

.feature-content {
    flex: 1;
}

.feature-image {
    flex: 1;
}

.feature-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-image:hover img {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-section.alternate .container {
    flex-direction: row-reverse;
}

.feature-header {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
}

.feature-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 1rem;
    font-size: 1.25rem;
    color: white;
}

.feature-header h2 {
    margin: 0;
}

.feature-details {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.detail-item {
    display: flex;
    align-items: flex-start;
}

.detail-icon {
    width: 40px;
    height: 40px;
    background: rgba(99, 172, 241, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 1rem;
    font-size: 1rem;
    color: var(--primary-color);
    flex-shrink: 0;
}

.detail-text h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.detail-text p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* 语言网格 */
.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.language-item {
    background: rgba(30, 41, 59, 0.3);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: flex;
    align-items: center;
    transition: transform 0.3s ease, background 0.3s ease;
}

.language-item:hover {
    transform: translateY(-5px);
    background: rgba(30, 41, 59, 0.5);
}

.language-item img {
    width: 40px;
    height: 40px;
    margin-right: 1rem;
}

.language-info h3 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.language-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0;
}

/* 特性列表 */
.feature-list {
    margin-top: 1.5rem;
}

.feature-list li {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
}

.feature-list li i {
    color: var(--primary-color);
    margin-right: 1rem;
}

/* 特性总结 */
.features-summary {
    background: linear-gradient(to bottom, var(--bg-dark), var(--bg-darker));
    padding: 5rem 0;
    text-align: center;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.summary-card {
    background: rgba(30, 41, 59, 0.3);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: transform 0.3s ease, background 0.3s ease;
}

.summary-card:hover {
    transform: translateY(-5px);
    background: rgba(30, 41, 59, 0.5);
}

.summary-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;
}

.summary-card h3 {
    margin-bottom: 1rem;
}

.summary-card p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* CTA部分 */
.features-cta {
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.9), rgba(30, 41, 59, 0.9));
    padding: 5rem 0;
    text-align: center;
}

.features-cta h2 {
    font-size: 2.25rem;
    margin-bottom: 1rem;
}

.features-cta p {
    max-width: 600px;
    margin: 0 auto 2rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

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

/* 响应式设计 */
@media (max-width: 992px) {
    .feature-section .container {
        flex-direction: column;
    }
    
    .feature-section.alternate .container {
        flex-direction: column;
    }
    
    .feature-content, .feature-image {
        width: 100%;
    }
    
    .feature-details {
        grid-template-columns: 1fr;
    }
    
    .languages-grid {
        grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    }
}

@media (max-width: 768px) {
    .features-nav-list a {
        padding: 0.5rem 0.75rem;
        font-size: 0.9rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        max-width: 300px;
        margin: 0 auto;
    }
}