/* 关于页（/about/）；规则限定在 .ab-page 内 */
.ab-page {
    padding-top: var(--navbar-height, 64px);
    background: #fff;
    color: #1d2939;
    font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

.ab-page h1,
.ab-page h2,
.ab-page h3,
.ab-page p,
.ab-page ul,
.ab-page li,
.ab-page dl,
.ab-page dt,
.ab-page dd {
    margin: 0;
    padding: 0;
    list-style: none;
}

.ab-page a {
    color: inherit;
    text-decoration: none;
}

/* ---------- 首屏 ---------- */
.ab-hero {
    padding: 40px 0 46px;
    border-bottom: 1px solid #eef4fd;
    background:
        radial-gradient(56% 70% at 92% 0%, rgba(198, 222, 255, .6) 0%, rgba(233, 243, 255, 0) 70%),
        radial-gradient(48% 60% at 0% 100%, rgba(214, 233, 255, .66) 0%, rgba(245, 250, 255, 0) 72%),
        linear-gradient(180deg, #f4f8ff 0%, #fbfdff 100%);
}

.ab-crumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: #9aa6b8;
}

.ab-crumb a {
    color: #7b8798;
    transition: color .2s ease;
}

.ab-crumb a:hover {
    color: #2f6bff;
}

.ab-crumb em {
    font-style: normal;
    color: #1d2939;
}

.ab-hero__title {
    margin-top: 18px;
    font-size: 32px;
    line-height: 1.45;
    font-weight: 600;
    letter-spacing: -.01em;
}

.ab-hero__desc {
    max-width: 900px;
    margin-top: 14px;
    font-size: 15px;
    line-height: 1.95;
    color: #55617a;
}

.ab-hero__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-top: 20px;
    font-size: 13px;
    color: #6b7a90;
}

.ab-hero__meta i {
    width: 1px;
    height: 12px;
    background: #d5e0f0;
}

/* ---------- 通用段落 ---------- */
.ab-sec {
    padding: 54px 0;
}

.ab-sec--soft {
    background: #fafcff;
    border-top: 1px solid #f2f7ff;
    border-bottom: 1px solid #f2f7ff;
}

.ab-sec__head {
    max-width: 880px;
    margin-bottom: 26px;
}

.ab-sec__title {
    font-size: 22px;
    font-weight: 600;
}

.ab-sec__lead {
    margin-top: 10px;
    font-size: 14.5px;
    line-height: 1.95;
    color: #5b6675;
}

/* ---------- 我们做什么 ---------- */
.ab-points {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.ab-point {
    padding: 24px 24px 26px;
    background: #fff;
    border: 1px solid #eef3fb;
    border-radius: 14px;
}

.ab-point h3 {
    font-size: 16px;
    font-weight: 600;
}

.ab-point h3::before {
    content: "";
    display: block;
    width: 22px;
    height: 3px;
    margin-bottom: 14px;
    border-radius: 2px;
    background: #3b73f0;
}

.ab-point p {
    margin-top: 10px;
    font-size: 13.8px;
    line-height: 1.95;
    color: #667085;
}

/* ---------- 产品范围 ---------- */
.ab-range {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.ab-range__item {
    position: relative;
    display: block;
    padding: 20px 22px;
    background: #fff;
    border: 1px solid #eef3fb;
    border-radius: 14px;
    transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}

.ab-range__item:hover {
    border-color: #bcd2ff;
    box-shadow: 0 10px 24px rgba(47, 107, 255, .08);
    transform: translateY(-1px);
}

.ab-range__name {
    font-size: 15.5px;
    font-weight: 600;
}

.ab-range__count {
    position: absolute;
    right: 20px;
    top: 21px;
    padding: 2px 9px;
    border-radius: 999px;
    background: #eef4ff;
    color: #2f6bff;
    font-size: 12px;
}

.ab-range__desc {
    display: block;
    margin-top: 8px;
    font-size: 13.5px;
    line-height: 1.85;
    color: #667085;
}

.ab-range__more {
    margin-top: 18px;
    font-size: 13.5px;
}

.ab-range__more a {
    color: #2f6bff;
}

/* ---------- 使用边界 ---------- */
.ab-rules {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.ab-rule {
    display: flex;
    flex-direction: column;
    padding: 22px 22px 20px;
    border: 1px solid #f2e6e0;
    border-radius: 14px;
    background: #fffdfb;
}

.ab-rule h3 {
    font-size: 15.5px;
    font-weight: 600;
}

.ab-rule p {
    margin-top: 10px;
    font-size: 13.5px;
    line-height: 1.95;
    color: #6b6a67;
}

.ab-rule__link {
    margin-top: auto;
    padding-top: 14px;
    font-size: 13px;
    color: #c2662f;
}

.ab-rule__link:hover {
    text-decoration: underline;
}

/* ---------- 会员与计费 ---------- */
.ab-billing {
    display: grid;
    grid-template-columns: 1.45fr .55fr;
    gap: 26px;
    align-items: start;
}

.ab-billing__list {
    margin-top: 20px;
}

.ab-billing__list li {
    display: flex;
    gap: 14px;
    padding: 13px 0;
    border-bottom: 1px dashed #e8eef8;
    font-size: 13.8px;
    line-height: 1.9;
}

.ab-billing__list strong {
    flex: 0 0 108px;
    font-weight: 600;
    color: #1d2939;
}

.ab-billing__list span {
    flex: 1;
    color: #5b6675;
}

.ab-billing__note {
    margin-top: 14px;
    font-size: 12.8px;
    color: #8b96a8;
}

.ab-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 42px;
    margin-top: 18px;
    padding: 0 24px;
    border-radius: 10px;
    border: 1px solid #cfdffb;
    background: #fff;
    font-size: 14px;
    color: #37455c;
}

.ab-btn--main {
    border-color: transparent;
    background: linear-gradient(90deg, #3d7eff 0%, #4d23f4 100%);
    color: #fff;
}

.ab-btn--main:hover {
    box-shadow: 0 10px 24px rgba(61, 126, 255, .26);
}

.ab-billing__card {
    padding: 22px;
    border: 1px dashed #d5e3f8;
    border-radius: 14px;
    background: #fff;
}

.ab-billing__card-title {
    font-size: 13px;
    font-weight: 600;
    color: #37455c;
}

.ab-billing__card ul {
    margin-top: 12px;
}

.ab-billing__card li {
    position: relative;
    padding-left: 16px;
    margin-bottom: 10px;
    font-size: 13px;
    line-height: 1.8;
    color: #6b7a90;
}

.ab-billing__card li::before {
    content: "";
    position: absolute;
    left: 2px;
    top: 9px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: #bcd2ff;
}

/* ---------- 备案与联系 ---------- */
.ab-facts {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.ab-rows {
    margin-top: 16px;
    border-top: 1px solid #eef3fb;
}

.ab-row {
    display: flex;
    gap: 16px;
    padding: 12px 0;
    border-bottom: 1px dashed #eef3fb;
    font-size: 13.8px;
}

.ab-row dt {
    flex: 0 0 118px;
    color: #8b96a8;
}

.ab-row dd {
    flex: 1;
    color: #1d2939;
    word-break: break-all;
}

.ab-row dd a {
    color: #2f6bff;
}

.ab-updated {
    padding: 0 0 56px;
    text-align: center;
    font-size: 12.5px;
    color: #a4b0c2;
}

@media (max-width: 1200px) {
    .ab-points,
    .ab-rules {
        grid-template-columns: repeat(2, 1fr);
    }

    .ab-billing,
    .ab-facts {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .ab-hero {
        padding: 28px 0 32px;
    }

    .ab-hero__title {
        font-size: 24px;
    }

    .ab-sec {
        padding: 38px 0;
    }

    .ab-points,
    .ab-rules,
    .ab-range {
        grid-template-columns: 1fr;
    }

    .ab-billing__list li {
        flex-direction: column;
        gap: 4px;
    }

    .ab-billing__list strong {
        flex: none;
    }
}