.about-section h1 {
    font-size: 2.5rem; color: var(--text-main); margin-bottom: 20px;
}
.sub-title {
    font-size: 1.1rem; color: var(--text-muted); line-height: 1.8; text-align: justify;
}

.about-section a {
    color: var(--primary); text-decoration: none;
}

.changelog-section {
    background: #ffffff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    margin-bottom: 30px;
}
.timeline {
    position: relative;
    padding-left: 30px;
    border-left: 2px solid #e2e8f0;
    margin-top: 25px;
}
.version-block {
    position: relative;
    margin-bottom: 35px;
}
.version-block:last-child {
    margin-bottom: 0;
}
.version-dot {
    position: absolute;
    left: -39px;
    top: 4px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: #ffffff;
    border: 4px solid #3182ce;
    z-index: 2;
}
.version-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 12px;
}
.v-num {
    font-family: monospace;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-main);
}
.v-date {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}
.v-badge {
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 4px;
}
.badge-new { background-color: #dcfce7; color: #15803d; }
.badge-update { background-color: #eff6ff; color: #1d4ed8; }

.change-card {
    background-color: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    padding: 18px;
}
.change-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.change-item {
    position: relative;
    padding-left: 65px;
    margin-bottom: 10px;
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
    text-align: justify;
}
.change-item:last-child {
    margin-bottom: 0;
}
.item-tag {
    position: absolute;
    left: 0;
    top: 2px;
    font-size: 11px;
    font-weight: 600;
    padding: 1px 6px;
    border-radius: 3px;
    width: 52px;
    text-align: center;
}
.tag-add { background-color: #ebf8ff; color: #2b6cb0; }
.tag-opt { background-color: #fef3c7; color: #b45309; }
.tag-fix { background-color: #fee2e2; color: #b91c1c; }

code {
    font-family: monospace;
    background-color: #edf2f7;
    color: var(--text-main);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
}