/* ====================
   系统介绍页面样式
   ==================== */
html {
    font-size: 15px;
}

.container {
    max-width: 1120px;
}
/* 主内容区域 */
.introduction-main {
    padding: 40px 0;
    background: #fbfaff;
}

/* 系统标题区域 */
.system-header {
    display: flex;
    gap: 40px;
    align-items: center;
    margin-bottom: 3.15rem;
}

.system-title-section {
    flex: 1;
}

.system-title-section h1 {
    font-size: 2.625rem;
    font-weight: 700;
    color: #202e26;
    margin-bottom: 0;
    line-height: 1.3;
}

.system-title-section h2 {
    font-size: 2.5rem;
    font-weight: 500;
    color: #202e26;
    margin-top: 0.5rem;
    margin-bottom: 0;
    line-height: 1.3;
}

.system-description {
    margin-top: 2.25rem;
    width: 32.375rem;
    color: #999;
    line-height: 2.125rem;
    font-size: 1rem;
}

.system-hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 特性区域 */
.feature-section {
    margin-bottom: 30px;
}

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

.feature-row {
    display: flex;
    gap: 60px;
    align-items: center;
}

.feature-text {
    flex: 1.5;
}

.feature-text h2 {
    font-size: 1.875rem;
    font-weight: 700;
    color: #2b2651;
    margin-bottom: 0;
}

.feature-text p {
    margin-top: 1.875rem;
    font-size: 1rem;
    line-height: 2.5rem;
    color: #315386;
    white-space: pre-wrap;
}

.feature-list {
    list-style: none;
    padding: 0;
    margin-top: 1.875rem;
}

.feature-list li {
    font-size: 14px;
    line-height: 2.5rem;
    color: #315386;
    white-space: pre-wrap;
    margin-bottom: 0;
    padding-left: 20px;
    position: relative;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: 700;
}

.feature-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}

.feature-image img {
    max-width: 394px;
    height: auto;
}

/* 占位图片样式 */
.placeholder-img {

}

.placeholder-img::after {
    content: '图片占位';
    position: relative;
    z-index: 1;
    background: rgba(255, 255, 255, 0.9);
    padding: 10px 20px;
    border-radius: 4px;
}

/* 语言支持区域 */
.language-section {
    margin-bottom: 60px;
    padding: 40px;
}

.chart-placeholder {
    display: flex;
    justify-content: center;
}

.chart-placeholder .placeholder-img {
}

/* 学科领域区域 */
.disciplines-section {
    padding: 40px;
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
}
.section-title img {
    width: 3.25rem;
    height: 0.75rem;
    display: block;
    margin: 0 auto;
    margin: 10px auto 20px;
}
.section-title h2 {
    font-size: 1.5rem;
    font-weight: 500;
    color: #305386;
    text-align: center;
}
.chart-title {
    margin-top: 3.75rem;
    font-size: 1.625rem;
    font-weight: 500;
    text-align: center;
    color: #2b2651;
}
.section-title h3 {
    margin-top: 0.625rem;
    font-size: 2.25rem;
    font-weight: 700;
    color: #2b2651;
    text-align: center;
    line-height: 1;
}

.section-title p {
    margin-top: 1.875rem;
    width: 55rem;
    font-size: 1rem;
    text-align: center;
    color: #666;
    margin: 0 auto;
}

.disciplines-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px 30px;
}

.discipline-category {
    padding: 0;
    background: transparent;
}

.discipline-category h4 {
    font-size: 1.375rem;
    font-weight: 500;
    color: #2b2651;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid #d0d5dd;
}

.discipline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background: #f0f2f5;
    color: #315386;
    font-size: 0.875rem;
    border-radius: 0.375rem;
    border: none;
    transition: all 0.3s ease;
    line-height: 1.5;
}

.tag:hover {
    background: var(--primary-blue);
    color: #ffffff;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .disciplines-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .system-header {
        flex-direction: column;
        padding: 30px 20px;
    }
    
    .feature-row {
        flex-direction: column !important;
    }
    
    .feature-section {
        padding: 30px 20px;
    }
    
    .disciplines-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title h2 {
        font-size: 24px;
    }
    
    .section-title h3 {
        font-size: 20px;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
}