/* ==========================================================================
   客户端下载（S4-5 / U-07 / U-15）
   - .cl-banner    首页 Banner 区双按钮
   - .dl-*         下载介绍页 /download/android、/download/windows
   - .site-footer  站内页脚
   全部使用站点主题变量（app.css 的 --primary-color / --bg-* / --text-*），
   深色主题自动跟随，不写死浅色值。
   ========================================================================== */

/* ---------------- 首页 Banner ---------------- */
.cl-banner {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
    padding: 16px 20px;
    margin: 0 0 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.cl-banner-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 220px;
    flex: 1 1 260px;
}

.cl-banner-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

.cl-banner-sub {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.cl-banner-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.cl-banner-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    min-width: 190px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}

.cl-banner-btn:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
    text-decoration: none;
}

.cl-banner-icon {
    font-size: 22px;
    color: var(--primary-color);
    line-height: 1;
}

.cl-banner-btn-body {
    display: flex;
    flex-direction: column;
    line-height: 1.35;
}

.cl-banner-btn-main {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.cl-banner-btn-meta {
    font-size: 12px;
    color: var(--text-secondary);
}

@media (max-width: 720px) {
    .cl-banner {
        padding: 14px;
    }

    .cl-banner-actions {
        width: 100%;
    }

    .cl-banner-btn {
        flex: 1 1 100%;
        min-width: 0;
    }
}

/* ---------------- 下载介绍页 ---------------- */
.dl-wrap {
    max-width: 1080px;
    margin: 0 auto;
    padding: 20px 20px 56px;
    color: var(--text-primary);
}

.dl-crumb {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.dl-crumb a {
    color: var(--text-secondary);
    text-decoration: none;
}

.dl-crumb a:hover {
    color: var(--primary-color);
}

.dl-crumb .dl-sep {
    color: var(--border-color);
}

.dl-crumb strong {
    color: var(--text-primary);
    font-weight: 600;
}

.dl-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 28px;
    align-items: center;
    padding: 28px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.dl-chip {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(79, 70, 229, .12);
    color: var(--primary-color);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: .3px;
}

.dl-title {
    margin: 12px 0 8px;
    font-size: 28px;
    line-height: 1.3;
    font-weight: 800;
    color: var(--text-primary);
}

.dl-desc {
    margin: 0 0 18px;
    font-size: 14px;
    line-height: 1.75;
    color: var(--text-secondary);
}

.dl-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 12px 18px;
    margin: 0 0 20px;
    padding: 14px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.dl-meta-item dt {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 2px;
}

.dl-meta-item dd {
    margin: 0;
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
    word-break: break-all;
}

.dl-meta-item dd.is-muted {
    color: var(--warning-color);
    font-weight: 600;
}

.dl-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}

.dl-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: background .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.dl-btn:hover {
    border-color: var(--primary-color);
    text-decoration: none;
    box-shadow: var(--shadow-sm);
}

.dl-btn-primary {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.dl-btn-primary:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
    color: #fff;
}

.dl-btn-primary.is-disabled {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-secondary);
    cursor: not-allowed;
    box-shadow: none;
}

.dl-btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.dl-note {
    margin: 14px 0 0;
    font-size: 12px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.dl-alert {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin: 12px 0 0;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    background: rgba(245, 158, 11, .12);
    color: var(--warning-color);
    font-size: 13px;
    line-height: 1.6;
}

.dl-hero-visual {
    min-width: 0;
}

.dl-hero-shot {
    display: block;
    width: 100%;
    max-height: 340px;
    object-fit: cover;
    object-position: top center;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

.dl-hero-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 40px 24px;
    min-height: 200px;
    border-radius: var(--radius-md);
    border: 1px dashed var(--border-color);
    background: var(--bg-primary);
}

.dl-hero-card-icon {
    font-size: 40px;
    color: var(--primary-color);
}

.dl-hero-card-title {
    margin: 0;
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.dl-hero-card-sub {
    margin: 0;
    font-size: 13px;
    color: var(--text-secondary);
}

.dl-section {
    margin-top: 40px;
}

.dl-h2 {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin: 0 0 16px;
    padding-left: 10px;
    border-left: 4px solid var(--primary-color);
    font-size: 19px;
    font-weight: 700;
    color: var(--text-primary);
}

.dl-h2-sub {
    font-size: 12px;
    font-weight: 400;
    color: var(--text-secondary);
}

.dl-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 14px;
}

.dl-feature {
    padding: 16px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

.dl-feature-icon {
    font-size: 20px;
    color: var(--primary-color);
}

.dl-feature-title {
    margin: 8px 0 4px;
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.dl-feature-desc {
    margin: 0;
    font-size: 13px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.dl-shots {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 20px;
    align-items: start;
}

.dl-shots-main img {
    display: block;
    width: 100%;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

.dl-shots-thumbs {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
}

.dl-thumb {
    padding: 0;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    background: none;
    cursor: pointer;
    overflow: hidden;
    line-height: 0;
}

.dl-thumb img {
    width: 100%;
    height: 62px;
    object-fit: cover;
    object-position: top center;
    border-radius: 2px;
}

.dl-thumb.is-active {
    border-color: var(--primary-color);
}

.dl-shots-caption {
    margin: 12px 0 12px;
    font-size: 13px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.dl-shots-nav {
    display: flex;
    gap: 8px;
}

.dl-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: dl-step;
}

.dl-step {
    position: relative;
    padding: 16px 16px 16px 52px;
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    counter-increment: dl-step;
}

.dl-step::before {
    content: counter(dl-step);
    position: absolute;
    left: 16px;
    top: 15px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-color);
    color: #fff;
    font-size: 13px;
    font-weight: 700;
    line-height: 24px;
    text-align: center;
}

.dl-step-title {
    margin: 0 0 4px;
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
}

.dl-step-desc {
    margin: 0;
    font-size: 13px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.dl-notes {
    margin: 0;
    padding: 14px 16px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    font-size: 13px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.dl-faq-item {
    padding: 12px 16px;
    margin-bottom: 10px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

.dl-faq-item summary {
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.dl-faq-item p {
    margin: 8px 0 0;
    font-size: 13px;
    line-height: 1.75;
    color: var(--text-secondary);
}

.dl-foot-note {
    margin: 32px 0 0;
    font-size: 12px;
    line-height: 1.8;
    color: var(--text-secondary);
}

@media (max-width: 900px) {
    .dl-hero,
    .dl-shots {
        grid-template-columns: minmax(0, 1fr);
    }

    .dl-hero {
        gap: 20px;
        padding: 20px;
    }

    .dl-title {
        font-size: 23px;
    }

    .dl-hero-shot {
        max-height: 260px;
    }
}

/* ---------------- 页脚 ---------------- */
.site-footer {
    margin-top: 48px;
    padding: 32px 20px 18px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.site-footer-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr));
    gap: 24px;
    max-width: 1080px;
    margin: 0 auto;
}

.site-footer-logo {
    font-size: 16px;
    font-weight: 800;
    color: var(--text-primary);
}

.site-footer-slogan {
    margin: 8px 0 0;
    font-size: 13px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.site-footer-title {
    margin: 0 0 10px;
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
}

.site-footer-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.site-footer-list li {
    margin-bottom: 8px;
}

.site-footer-list a {
    font-size: 13px;
    color: var(--text-secondary);
    text-decoration: none;
}

.site-footer-list a:hover {
    color: var(--primary-color);
}

.site-footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    max-width: 1080px;
    margin: 24px auto 0;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    font-size: 12px;
    color: var(--text-secondary);
}

.site-footer-beian a {
    font-size: 12px;
    color: var(--text-secondary);
    text-decoration: none;
}

.site-footer-beian a:hover {
    color: var(--primary-color);
}

@media (max-width: 900px) {
    .site-footer-inner {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}