/* Admin sidebar layout — load after style.css (v3) */

html.admin-has-layout {
    --sidebar-w: 14rem;
    --sidebar-w-collapsed: 3.75rem;
    --topbar-h: 3.25rem;
}

html.admin-has-layout body {
    padding-left: var(--sidebar-w);
    padding-top: var(--topbar-h);
    transition: padding-left 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

html.admin-has-layout.sidebar-collapsed body {
    padding-left: var(--sidebar-w-collapsed);
}

html.admin-has-layout .page-main,
html.admin-has-layout .admin-content {
    max-width: 80rem;
    margin-left: auto;
    margin-right: auto;
    padding: 1rem 0.85rem 2.5rem;
    animation: pageIn 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.admin-sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-w);
    z-index: 60;
    display: flex;
    flex-direction: column;
    background: var(--sidebar-bg, #fafbfc);
    border-right: 1px solid var(--sidebar-border, #e8edf3);
    transition: width 0.28s cubic-bezier(0.4, 0, 0.2, 1), transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
}

.sidebar-head {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.65rem;
    padding: 0.75rem 0.65rem 0.85rem;
    border-bottom: 1px solid var(--sidebar-border, #e8edf3);
    flex-shrink: 0;
}

.sidebar-collapse-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    border: 1px solid var(--sidebar-border, #e8edf3);
    border-radius: 0.55rem;
    background: var(--surface, #fff);
    color: var(--text-muted);
    cursor: pointer;
    flex-shrink: 0;
}

.sidebar-ico--expand { display: none; }
html.sidebar-collapsed .sidebar-ico--collapse { display: none; }
html.sidebar-collapsed .sidebar-ico--expand { display: block; }

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: inherit;
    min-width: 0;
    padding: 0 0.15rem;
}

.sidebar-brand-mark {
    width: 2rem;
    height: 2rem;
    border-radius: 0.55rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    background: linear-gradient(135deg, #3b82f6, #6366f1);
    flex-shrink: 0;
    color: #fff;
}

.sidebar-brand-text {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0.5rem 0.45rem;
    -webkit-overflow-scrolling: touch;
}

.sidebar-link {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0.6rem;
    padding: 0.58rem 0.7rem;
    margin-bottom: 0.15rem;
    border-radius: 0.55rem;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    transition: background 0.18s, color 0.18s;
}

.sidebar-link:hover {
    background: rgba(148, 163, 184, 0.12);
    color: var(--text);
}

.sidebar-link.is-active {
    background: var(--primary-soft);
    color: var(--primary);
    font-weight: 600;
}

.sidebar-link-icon {
    font-size: 1.05rem;
    width: 1.35rem;
    text-align: center;
    flex-shrink: 0;
}

.sidebar-link-text {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-foot {
    padding: 0.45rem;
    border-top: 1px solid var(--sidebar-border, #e8edf3);
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    flex-shrink: 0;
}

.sidebar-foot-btn {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    width: 100%;
    padding: 0.55rem 0.7rem;
    border: none;
    border-radius: 0.55rem;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.875rem;
    cursor: pointer;
}

.sidebar-link--logout { color: var(--danger) !important; }

.admin-topbar {
    position: fixed;
    top: 0;
    left: var(--sidebar-w);
    right: 0;
    height: var(--topbar-h);
    z-index: 50;
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0 1rem;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: left 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

html.sidebar-collapsed .admin-topbar { left: var(--sidebar-w-collapsed); }
html.sidebar-collapsed .admin-sidebar { width: var(--sidebar-w-collapsed); }
html.sidebar-collapsed .sidebar-brand,
html.sidebar-collapsed .sidebar-link-text,
html.sidebar-collapsed .sidebar-foot-label { display: none !important; }
html.sidebar-collapsed .sidebar-head { padding: 0.55rem 0.4rem; align-items: center; }
html.sidebar-collapsed .sidebar-collapse-btn { margin: 0 auto; }
html.sidebar-collapsed .sidebar-link,
html.sidebar-collapsed .sidebar-foot-btn { justify-content: center; padding-left: 0; padding-right: 0; }

.topbar-menu-btn,
.topbar-theme-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 0.55rem;
    border: 1px solid var(--border);
    background: var(--surface);
    cursor: pointer;
    flex-shrink: 0;
}

.topbar-title-wrap { flex: 1; min-width: 0; }
.topbar-kicker { display: block; font-size: 0.6875rem; color: var(--text-faint); }
.topbar-page-title { margin: 0; font-size: 1.0625rem; font-weight: 700; color: var(--text); }

.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 55;
    background: rgba(15, 23, 42, 0.4);
    opacity: 0;
    transition: opacity 0.28s ease;
    pointer-events: none;
}
.sidebar-backdrop.is-visible {
    display: block;
    opacity: 1;
    pointer-events: auto;
}

/* PC */
@media (min-width: 768px) {
    .sidebar-collapse-btn { display: inline-flex; }
}

/* Mobile + WeChat in-app browser */
@media (max-width: 767px) {
    html.admin-has-layout body { padding-left: 0 !important; }

    .admin-sidebar {
        -webkit-transform: translateX(-100%);
        transform: translateX(-100%);
        width: min(17rem, 88vw);
        box-shadow: 8px 0 32px rgba(0, 0, 0, 0.15);
    }
    .admin-sidebar.is-open {
        -webkit-transform: translateX(0);
        transform: translateX(0);
    }

    html.sidebar-collapsed .admin-sidebar { width: min(17rem, 88vw); }
    html.sidebar-collapsed .sidebar-brand,
    html.sidebar-collapsed .sidebar-link-text,
    html.sidebar-collapsed .sidebar-foot-label { display: block !important; }
    html.sidebar-collapsed .sidebar-brand { display: flex !important; }
    html.sidebar-collapsed body { padding-left: 0 !important; }

    .admin-topbar { left: 0 !important; }
    .topbar-menu-btn,
    .topbar-theme-btn { display: inline-flex; }
    .sidebar-collapse-btn { display: none !important; }

    html.admin-has-layout .page-header .page-title { display: none; }
    html.admin-has-layout .page-mobile-hide-title h2:first-child { display: none; }

    .sidebar-link,
    .sidebar-foot-btn {
        min-height: 2.75rem;
        touch-action: manipulation;
    }

    /* 微信 WebView：translateZ(0) 会冲掉 translateX 抽屉动画，必须用 translate3d */
    .is-wechat .admin-sidebar {
        -webkit-transform: translate3d(-100%, 0, 0);
        transform: translate3d(-100%, 0, 0);
    }
    .is-wechat .admin-sidebar.is-open {
        -webkit-transform: translate3d(0, 0, 0);
        transform: translate3d(0, 0, 0);
    }
    .is-wechat .admin-topbar {
        padding-top: env(safe-area-inset-top, 0);
        height: calc(var(--topbar-h) + env(safe-area-inset-top, 0));
    }
    html.admin-has-layout.is-wechat body {
        padding-top: calc(var(--topbar-h) + env(safe-area-inset-top, 0));
    }
}

html.sidebar-scroll-lock body {
    overflow: hidden;
    position: fixed;
    width: 100%;
    left: 0;
    right: 0;
}

.is-wechat .sidebar-link,
.is-wechat .sidebar-foot-btn,
.is-wechat .topbar-menu-btn {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

[data-theme="dark"] .admin-sidebar { background: var(--sidebar-bg); }
[data-theme="dark"] .admin-topbar { background: rgba(20, 20, 22, 0.92) !important; }