.content_panel {
    min-height: calc(100vh - 400px);
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e7ec 100%);
    color: #555;
    line-height: 1.6;
    padding-bottom: 60px;
}

.container {
    width: 80%;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
    position: relative;
    padding-top: 60px;

}

.section-title h2 {
    font-size: 2.5rem;
    color: #017A75;
    font-family: 'HarmonyOS_Sans_SC';
    display: inline-block;
    padding-bottom: 15px;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 130px;
    height: 4px;
    background: #017A75;
    border-radius: 2px;
}

.charter-content {
    background: white;
    border-radius: 15px;
    padding: 50px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    width: 80%;
    margin: 0 auto;
}

.abstract {
    text-indent: 26px;
    font-size: 1rem;
    margin-bottom: 10px;
}

.chapter {
    margin-bottom: 50px;
    padding-bottom: 40px;
    border-bottom: 1px solid #eaeef5;
}

.chapter:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.chapter-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
}

.chapter-number {
    background: #32E1C6;
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
}

.chapter-title {
    font-size: 1.2rem;
    color: #017A75;
}

.chapter-content {
    padding-left: 65px;
}

.chapter-content h3 {
    color: #555;
    margin: 20px 0 15px;
    font-size: 1.4rem;
}

.chapter-content p {
    margin-bottom: 15px;
    color: #555;
}

.chapter-content ul {
    margin: 20px 0;
    padding-left: 30px;
    list-style-type: none;
}

.chapter-content li {
    margin-bottom: 10px;
    position: relative;
    padding-left: 25px;
}

.chapter-content li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 12px;
    height: 12px;
    background: #017A75;
    border-radius: 50%;
}

/* 时间线 */
.timeline {
    display: flex;
    flex-direction: column;
    margin: 40px 0;
}

.timeline-item {
    display: flex;
    margin-bottom: 30px;
}

.timeline-date {
    min-width: 186px;
    padding-right: 30px;
    text-align: right;
    font-weight: 700;
    color: #555;
}

.timeline-content {
    position: relative;
    padding-left: 30px;
    flex: 1;
}

.timeline-content::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 15px;
    height: 15px;
    background: #017A75;
    border-radius: 50%;
    z-index: 2;
}

.timeline-content::after {
    content: '';
    position: absolute;
    left: 7px;
    top: 8px;
    width: 1px;
    height: calc(100% + 30px);
    background: #017A75;
    z-index: 1;
}

.timeline-item:last-child .timeline-content::after {
    display: none;
}

@media (max-width: 992px) {

    .chapter-content {
        padding-left: 0;
        width: 96%;
    }
}

@media (max-width: 768px) {

    .charter-content {
        padding: 30px;
    }

    .charter-content p {
        text-align: justify;
    }

    .timeline-date {
        min-width: 120px;
    }

    .chapter-content li {
        padding-left: 15px;
        text-align: justify;
    }

    .chapter-content ul {
        padding-left: 10px;
    }

    .chapter-content ul p {
        text-align: justify;
    }
}

@media (max-width: 576px) {

    .timeline-item {
        flex-direction: column;
    }

    .timeline-date {
        text-align: left;
        padding-right: 0;
        margin-bottom: 10px;
    }

    .timeline-content {
        padding-left: 30px;
    }
}