/* 客户「使用教程」列表 / 详情：浅色玻璃卡，跟登录 Hub、登记页同一套冷灰 + 电光蓝 */

.tut-page {
    --tut-bg: #eef2f7;
    --tut-card: #ffffff;
    --tut-line: #e7ebf1;
    --tut-ink: #0f172a;
    --tut-muted: #64748b;
    --tut-dim: #94a3b8;
    --tut-accent: #2563eb;
    --tut-tag: #0891b2;
    --tut-r: 20px;
    --tut-ease: cubic-bezier(0.32, 0.72, 0, 1);
    background: var(--tut-bg);
}

.tut-page .app-body,
.tut-page .content-wrapper,
.tut-page .content-container,
.tut-page .container-fluid {
    padding: 0 !important;
    margin: 0 !important;
    background: var(--tut-bg) !important;
    border: none !important;
    box-shadow: none !important;
    border-radius: 0 !important;
    min-height: 0 !important;
    overflow: visible !important;
}

.tut-dark {
    background: var(--tut-bg);
    color: var(--tut-ink);
    min-height: 100vh;
    padding: 20px 16px calc(24px + env(safe-area-inset-bottom, 0px));
    -webkit-font-smoothing: antialiased;
}

.tut-wrap {
    max-width: 1100px;
    margin: 0 auto;
}

.tut-wrap--article {
    max-width: 820px;
}

/* ---------- 页头：身份一行，标题独占下一行 ---------- */
.tut-head {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    margin-bottom: 22px;
}

.tut-head-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.tut-brand {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--tut-muted);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
}

.tut-brand img {
    width: 28px;
    height: 28px;
    border-radius: 7px;
    object-fit: contain;
}

.tut-title {
    margin: 4px 0 0;
    font-size: clamp(32px, 8.5vw, 40px);
    font-weight: 800;
    letter-spacing: -0.035em;
    line-height: 1.12;
    color: var(--tut-ink);
}

.btn-back {
    flex: 0 0 auto;
    min-height: 44px;
    padding: 0 16px;
    border-radius: 999px;
    border: 1px solid var(--tut-line);
    background: #ffffff;
    color: var(--tut-ink);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.05);
}

.btn-back:hover { background: #f1f5f9; color: var(--tut-ink); }
.btn-back:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.28);
    outline-offset: 2px;
}

/* ---------- 列表卡片 ---------- */
.tut-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}

.tut-card {
    background: var(--tut-card);
    border: 1px solid var(--tut-line);
    border-radius: var(--tut-r);
    overflow: hidden;
    text-decoration: none;
    color: var(--tut-ink);
    display: flex;
    flex-direction: column;
    box-shadow: 0 6px 24px rgba(15, 23, 42, 0.06);
    transition: transform 0.28s var(--tut-ease), box-shadow 0.28s var(--tut-ease);
}

.tut-card:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.28);
    outline-offset: 3px;
}

.tut-cover {
    position: relative;
    aspect-ratio: 16 / 9;
    background: #f1f5f9;
    overflow: hidden;
}

.tut-cover img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    display: block;
}

.tut-cover .placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.4rem;
    color: rgba(15, 23, 42, 0.16);
}

.tut-card-body {
    padding: 14px 16px 16px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.tut-cat {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--tut-tag);
    background: rgba(8, 145, 178, 0.1);
    border: 1px solid rgba(8, 145, 178, 0.22);
    padding: 3px 10px;
    border-radius: 999px;
    align-self: flex-start;
}

.tut-card h3 {
    margin: 0;
    font-size: 17px;
    font-weight: 700;
    line-height: 1.4;
    color: var(--tut-ink);
}

.tut-card p {
    margin: 0;
    font-size: 14px;
    color: var(--tut-muted);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.tut-meta {
    margin-top: auto;
    padding-top: 8px;
    font-size: 12px;
    color: var(--tut-dim);
    display: flex;
    align-items: center;
    gap: 12px;
}

.tut-empty {
    text-align: center;
    padding: 4rem 1rem;
    color: var(--tut-dim);
}

.tut-empty i {
    font-size: 3rem;
    opacity: 0.4;
    display: block;
    margin-bottom: 1rem;
}

/* ---------- 详情 ---------- */
.tut-article-title {
    font-size: clamp(26px, 6.5vw, 34px);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.25;
    margin: 14px 0 8px;
    color: var(--tut-ink);
}

.tut-sub {
    color: var(--tut-muted);
    font-size: 16px;
    line-height: 1.55;
    margin: 0 0 12px;
}

.tut-meta-row {
    font-size: 13px;
    color: var(--tut-dim);
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    margin-bottom: 18px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--tut-line);
}

.tut-cover-big {
    width: 100%;
    margin-bottom: 20px;
    border-radius: var(--tut-r);
    overflow: hidden;
    border: 1px solid var(--tut-line);
    background: #f1f5f9;
}

.tut-cover-big img {
    width: 100%;
    height: auto;
    display: block;
}

.tut-content {
    font-size: 16px;
    line-height: 1.8;
    color: #334155;
    word-break: break-word;
    overflow-wrap: anywhere;
}

.tut-content h2 {
    font-size: 1.2rem;
    line-height: 1.45;
    margin: 1.6rem 0 0.7rem;
    padding-left: 0.75rem;
    border-left: 4px solid var(--tut-accent);
    font-weight: 800;
    color: var(--tut-ink);
}

.tut-content h3 {
    font-size: 1.05rem;
    line-height: 1.5;
    margin: 1.2rem 0 0.5rem;
    font-weight: 800;
    color: #1e3a8a;
}

.tut-content p { margin: 0.75rem 0; }

.tut-content img {
    max-width: 100% !important;
    width: auto;
    height: auto !important;
    border-radius: 14px;
    margin: 1rem auto;
    display: block;
    object-fit: contain;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.1);
}

.tut-content blockquote {
    margin: 1rem 0;
    padding: 0.85rem 1rem;
    border-left: 4px solid #94a3b8;
    background: #f8fafc;
    border-radius: 0 14px 14px 0;
    color: #475569;
}

.tut-content ul,
.tut-content ol { padding-left: 1.3rem; margin: 0.75rem 0; }
.tut-content li { margin: 0.35rem 0; }

.tut-content .article-callout {
    border-radius: 16px;
    padding: 1rem;
    margin: 1rem 0;
    border: 1px solid #dbeafe;
    background: #eff6ff;
    color: #1e3a8a;
}

.tut-content .article-callout strong { display: block; margin-bottom: 0.35rem; }
.tut-content .article-callout.warning { border-color: #fde68a; background: #fffbeb; color: #92400e; }
.tut-content .article-callout.success { border-color: #bbf7d0; background: #f0fdf4; color: #166534; }

.tut-content .article-step {
    display: flex;
    gap: 0.8rem;
    align-items: flex-start;
    padding: 0.9rem;
    border-radius: 16px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    margin: 0.8rem 0;
}

.tut-content .step-no {
    width: 32px;
    height: 32px;
    border-radius: 999px;
    background: var(--tut-accent);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    flex: 0 0 32px;
}

.tut-content .article-divider {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    color: #94a3b8;
    margin: 1.5rem 0;
    font-size: 0.8rem;
    letter-spacing: 0.12em;
}

.tut-content .article-divider::before,
.tut-content .article-divider::after {
    content: "";
    height: 1px;
    background: #e2e8f0;
    flex: 1;
}

.tut-images {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 1.5rem;
}

.tut-images a {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 140px;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--tut-line);
    background: #f8fafc;
}

.tut-images img {
    max-width: 100%;
    width: auto;
    max-height: 280px;
    height: auto;
    object-fit: contain;
    display: block;
}

.tut-foot {
    text-align: center;
    margin-top: 2.5rem;
    color: var(--tut-dim);
    font-size: 13px;
}

.tut-foot-brand {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 6px;
    color: var(--tut-muted);
    font-weight: 600;
}

.tut-foot-brand img {
    width: 20px;
    height: 20px;
    border-radius: 5px;
    object-fit: contain;
}

.tut-detail .btn-back { margin-bottom: 18px; align-self: flex-start; }

/* ---------- 平板 / 桌面 ---------- */
@media (min-width: 640px) {
    .tut-dark { padding: 28px 24px 40px; }
    .tut-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
    .tut-images { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 960px) {
    .tut-dark { padding: 36px 32px 48px; }
    .tut-head { margin-bottom: 28px; }
    .tut-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
    .tut-card-body { padding: 16px 18px 18px; }
    .tut-images { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
}

@media (hover: hover) and (pointer: fine) {
    .tut-card:hover {
        transform: translateY(-3px);
        box-shadow: 0 16px 40px rgba(15, 23, 42, 0.12);
    }
}

@media (prefers-reduced-motion: reduce) {
    .tut-card { transition: none; }
    .tut-card:hover { transform: none; }
}