/* 帮助中心专题：只约束 .help-page，避免污染全站顶栏 */
body.help-page {
    background: #f4f6f8;
    color: #1c2430;
}

@media screen and (min-width: 769px) {
    body.help-page .help-hero {
        margin-top: 70px;
    }
}

.help-hero {
    background:
        linear-gradient(115deg, rgba(8, 22, 48, 0.92) 0%, rgba(15, 52, 110, 0.78) 58%, rgba(21, 83, 166, 0.55) 100%),
        url("/app/ivryun/root/images/slider1.jpg") center 30% / cover no-repeat;
    color: #fff;
    padding: 52px 20px 40px;
}

.help-wrap {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
}

.help-kicker {
    margin: 0 0 10px;
    font-size: 13px;
    letter-spacing: 0.18em;
    color: #9ec0ff;
}

.help-hero h2 {
    margin: 0;
    max-width: 16em;
    font-size: 36px;
    line-height: 1.25;
    font-weight: 650;
}

.help-hero p.lead {
    margin: 14px 0 0;
    max-width: 640px;
    font-size: 16px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.86);
}

.help-search {
    margin-top: 26px;
    display: flex;
    align-items: center;
    gap: 10px;
    max-width: 560px;
    background: #fff;
    border-radius: 4px;
    padding: 0 14px;
}

.help-search input {
    flex: 1;
    height: 48px;
    border: 0;
    outline: none;
    font-size: 15px;
    color: #1c2430;
    background: transparent;
}

.help-search span {
    color: #7a8796;
    font-size: 13px;
    white-space: nowrap;
}

.help-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 28px;
    padding: 28px 0 12px;
    align-items: start;
}

.help-nav {
    position: sticky;
    top: 86px;
    background: #fff;
    border: 1px solid #e4e8ee;
    padding: 10px;
}

.help-nav button {
    display: flex;
    width: 100%;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    border: 0;
    background: transparent;
    text-align: left;
    padding: 10px 12px;
    font-size: 14px;
    color: #334155;
    cursor: pointer;
    border-radius: 2px;
}

.help-nav button em {
    font-style: normal;
    font-size: 12px;
    color: #8a96a3;
}

.help-nav button.is-on,
.help-nav button:hover {
    background: #eef4ff;
    color: #0f3d8c;
}

.help-group {
    margin: 0 0 22px;
    background: #fff;
    border: 1px solid #e4e8ee;
}

.help-group h2 {
    margin: 0;
    padding: 16px 22px 0;
    font-size: 20px;
    color: #122033;
}

.help-group .help-group-desc {
    margin: 6px 22px 0;
    color: #667385;
    font-size: 13px;
    line-height: 1.6;
}

.help-item {
    border-top: 1px solid #eef1f5;
    margin: 14px 8px 0;
}

.help-item:first-of-type {
    margin-top: 12px;
}

.help-item summary {
    list-style: none;
    cursor: pointer;
    padding: 14px 14px;
    font-size: 16px;
    font-weight: 650;
    color: #1a2740;
    display: flex;
    justify-content: space-between;
    gap: 16px;
}

.help-item summary::-webkit-details-marker {
    display: none;
}

.help-item summary::after {
    content: "+";
    flex: none;
    width: 22px;
    color: #1553c7;
    font-weight: 500;
    font-size: 20px;
    line-height: 1;
}

.help-item[open] summary::after {
    content: "–";
}

.help-item .a {
    padding: 0 14px 16px 14px;
    color: #3d4b5c;
    font-size: 15px;
    line-height: 1.8;
}

.help-item .a a {
    color: #1553c7;
    text-decoration: none;
    border-bottom: 1px solid rgba(21, 83, 199, 0.35);
}

.help-empty {
    display: none;
    padding: 36px 8px;
    color: #667385;
    text-align: center;
}

.help-links {
    padding: 8px 0 36px;
}

.help-links h2 {
    margin: 0 0 12px;
    font-size: 18px;
}

.help-links ul {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.help-links a {
    display: inline-block;
    padding: 8px 12px;
    background: #fff;
    border: 1px solid #d7dee8;
    color: #1a2740;
    text-decoration: none;
    font-size: 13px;
}

.help-links a:hover {
    border-color: #1553c7;
    color: #1553c7;
}

@media screen and (max-width: 860px) {
    .help-hero h2 {
        font-size: 28px;
    }

    .help-layout {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .help-nav {
        position: static;
        display: flex;
        overflow-x: auto;
        gap: 6px;
        padding: 8px;
    }

    .help-nav button {
        width: auto;
        white-space: nowrap;
        background: #f6f8fb;
    }

    .help-wrap {
        width: min(1120px, calc(100% - 28px));
    }
}