/* ===================================
   关于页面专用样式
   =================================== */

.about-hero {
    padding: 160px 0 80px;
    background: var(--gradient-primary);
    text-align: center;
    color: white;
}

.about-hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
}

.about-hero p {
    font-size: 18px;
    opacity: 0.9;
}

.about-section {
    padding: 100px 0;
    background: white;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.about-text p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 32px;
}

.about-feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
    color: var(--text-primary);
    font-weight: 500;
}

.feature-check {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--success-color);
    color: white;
    border-radius: 50%;
    font-size: 14px;
    font-weight: 700;
}

.about-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.about-illustration {
    position: relative;
    width: 300px;
    height: 300px;
}

.illustration-icon {
    position: relative;
    z-index: 2;
    font-size: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.illustration-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    border-radius: 50%;
    opacity: 0.1;
    transform: scale(1.2);
}

/* 技术栈 */
.tech-section {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.tech-section h2 {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.section-subtitle {
    text-align: center;
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 48px;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.tech-card {
    background: white;
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.tech-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.tech-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.tech-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.tech-card p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.tech-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.tech-list li {
    font-size: 13px;
    color: var(--text-muted);
}

/* 团队介绍 */
.team-section {
    padding: 100px 0;
    background: white;
}

.team-section h2 {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    color: var(--text-primary);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.contact-card {
    text-align: center;
    padding: 40px 32px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.contact-card:hover {
    background: var(--primary-light);
}

.contact-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.contact-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.contact-card p {
    font-size: 15px;
    color: var(--text-secondary);
}

.contact-hours {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 8px;
}

/* 版本信息 */
.version-section {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.version-section h2 {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    color: var(--text-primary);
}

.version-content {
    max-width: 600px;
    margin: 0 auto;
}

.version-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-md);
}

.version-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 12px;
}

.version-badge {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

.version-badge.current {
    background: var(--success-color);
    color: white;
}

.version-number {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

.version-date {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.version-changes {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.version-changes li {
    font-size: 15px;
    color: var(--text-secondary);
    padding-left: 28px;
    position: relative;
}

/* 响应式 */
@media (max-width: 968px) {
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
}