/* ===== 关于页面样式 about.css ===== */
/* 仅关于页面使用：关于Hero、卡片容器、特点网格、分类标签、时间线、联系框 */

/* ===== About Hero ===== */
.about-hero {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: #fff;
    padding: 48px 20px 40px;
    text-align: center;
}
.about-hero h1 {
    font-size: 30px;
    font-weight: 700;
    margin-bottom: 12px;
}
.about-hero p {
    font-size: 16px;
    opacity: 0.9;
    max-width: 560px;
    margin: 0 auto;
}

/* ===== About Page Main ===== */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 20px 48px;
}

/* ===== About Card ===== */
.about-card {
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    padding: 32px;
    margin-bottom: 24px;
}
.about-card h2 {
    font-size: 20px;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.about-card h3 {
    font-size: 17px;
    font-weight: 600;
    color: #1f2937;
    margin: 20px 0 10px;
}
.about-card p {
    font-size: 15px;
    color: #4b5563;
    line-height: 1.8;
    margin-bottom: 12px;
}
.about-card ul {
    margin-left: 20px;
    color: #4b5563;
    font-size: 15px;
    line-height: 1.8;
}
.about-card ul li {
    margin-bottom: 6px;
}
.about-card strong {
    color: #1f2937;
}

/* ===== Feature Grid ===== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    margin-top: 16px;
}
.feature-item {
    background: #f8fafc;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 20px;
}
.feature-item .icon {
    font-size: 28px;
    margin-bottom: 8px;
}
.feature-item h4 {
    font-size: 15px;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 6px;
}
.feature-item p {
    font-size: 13px;
    color: #6b7280;
    line-height: 1.6;
    margin: 0;
}

/* ===== Category Tags ===== */
.category-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 12px;
}
.category-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: #eff6ff;
    color: #2563eb;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
}

/* ===== Timeline ===== */
.timeline {
    margin-top: 16px;
}
.timeline-item {
    display: flex;
    gap: 16px;
    padding: 12px 0;
    border-bottom: 1px solid #f3f4f6;
}
.timeline-item:last-child {
    border-bottom: none;
}
.timeline-date {
    font-size: 13px;
    color: #9ca3af;
    font-weight: 500;
    white-space: nowrap;
    width: 80px;
    flex-shrink: 0;
}
.timeline-text {
    font-size: 14px;
    color: #4b5563;
}

/* ===== Contact Box ===== */
.contact-box {
    background: #f8fafc;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 20px;
    margin-top: 12px;
}
.contact-box p {
    font-size: 14px;
    color: #4b5563;
    margin-bottom: 8px;
}
.contact-box a {
    color: #2563eb;
    font-weight: 500;
}

/* ===== 关于页移动端 ===== */
@media (max-width: 768px) {
    .about-hero { padding: 36px 16px 28px; }
    .about-hero h1 { font-size: 24px; }
    .about-hero p { font-size: 14px; }
    .about-card { padding: 20px; }
    .feature-grid { grid-template-columns: 1fr; }
}