:root {
    --sidebar-bg: #0f172a;
    --sidebar-hover: #1e293b;
    --sidebar-active: #0ea5e9;
    --sidebar-text: #94a3b8;
    --sidebar-text-bright: #f8fafc;
    --main-bg: #f1f5f9;
    --card-bg: #ffffff;
    --accent: #0284c7;
    --accent-soft: #e0f2fe;
    --border: #e2e8f0;
    --text: #0f172a;
    --text-muted: #64748b;
    --success: #059669;
    --danger: #dc2626;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
    --sidebar-width: 260px;
}

* {
    box-sizing: border-box;
}

body.admin-body {
    margin: 0;
    min-height: 100vh;
    font-family: "DM Sans", system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", sans-serif;
    background: var(--main-bg);
    color: var(--text);
}

.admin-shell {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    align-self: flex-start;
    min-height: 100vh;
    box-shadow: 4px 0 24px rgba(15, 23, 42, 0.12);
}

.admin-brand {
    padding: 1.35rem 1.25rem;
    border-bottom: 1px solid rgba(148, 163, 184, 0.12);
}

.admin-brand a {
    color: var(--sidebar-text-bright);
    font-weight: 700;
    font-size: 1.05rem;
    text-decoration: none;
    letter-spacing: 0.02em;
}

.admin-brand small {
    display: block;
    margin-top: 0.35rem;
    font-size: 0.72rem;
    color: var(--sidebar-text);
    font-weight: 400;
    opacity: 0.85;
}

.admin-nav {
    padding: 0.75rem 0;
    flex: 1;
}

.admin-nav a {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.65rem 1.25rem;
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 0.9rem;
    border-left: 3px solid transparent;
    transition: background 0.15s, color 0.15s;
}

.admin-nav a:hover {
    background: var(--sidebar-hover);
    color: var(--sidebar-text-bright);
}

.admin-nav a.active {
    background: rgba(14, 165, 233, 0.12);
    color: var(--sidebar-text-bright);
    border-left-color: var(--sidebar-active);
}

.admin-nav .nav-icon {
    width: 1.25rem;
    text-align: center;
    opacity: 0.9;
}

.admin-nav-section-label {
    padding: 0.85rem 1.25rem 0.35rem;
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--sidebar-text);
    opacity: 0.55;
}

.admin-nav-section-label:first-child {
    padding-top: 0.5rem;
}

.admin-sidebar-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid rgba(148, 163, 184, 0.12);
    font-size: 0.8rem;
}

.admin-main {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.admin-topbar {
    background: var(--card-bg);
    padding: 1rem 1.75rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    box-shadow: var(--shadow);
}

.admin-topbar h1 {
    margin: 0;
    font-size: 1.35rem;
    font-weight: 700;
}

.admin-content {
    padding: 1.5rem 1.75rem 2.5rem;
    flex: 1;
}

.card-admin {
    background: var(--card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 1.35rem 1.5rem;
    margin-bottom: 1.25rem;
}

.card-admin h2 {
    margin: 0 0 1rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 1.25rem 1.35rem;
    box-shadow: var(--shadow);
}

.stat-card .label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.35rem;
}

.stat-card .value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
}

.table-admin {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.table-admin th,
.table-admin td {
    padding: 0.65rem 0.85rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.table-admin th {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.table-admin tbody tr:hover {
    background: #f8fafc;
}

.badge-status {
    display: inline-block;
    padding: 0.2rem 0.55rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-active {
    background: #d1fae5;
    color: #047857;
}

.badge-disabled {
    background: #fee2e2;
    color: #b91c1c;
}

.btn-admin {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.45rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: opacity 0.15s, transform 0.1s;
}

.btn-admin:hover {
    opacity: 0.92;
}

.btn-primary-admin {
    background: var(--accent);
    color: #fff;
}

.btn-ghost-admin {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--border);
}

.btn-danger-admin {
    background: var(--danger);
    color: #fff;
}

.form-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: flex-end;
    margin-bottom: 1rem;
}

.form-filter .field label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.form-control-admin {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.45rem 0.75rem;
    font-size: 0.875rem;
    min-width: 160px;
}

.form-control-admin:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.mono {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.82em;
}

.alert-admin {
    padding: 0.85rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.alert-success-admin {
    background: #d1fae5;
    color: #065f46;
}

.alert-danger-admin {
    background: #fee2e2;
    color: #991b1b;
}

.alert-warn-admin {
    background: #fef3c7;
    color: #92400e;
}

.text-muted-admin {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.d-flex {
    display: flex;
}

.flex-wrap {
    flex-wrap: wrap;
}

.justify-content-between {
    justify-content: space-between;
}

.align-items-center {
    align-items: center;
}

.gap-2 {
    gap: 0.5rem;
}

.mb-0 {
    margin-bottom: 0;
}

.mb-3 {
    margin-bottom: 1rem;
}

.small {
    font-size: 0.875rem;
}

.w-100 {
    width: 100%;
}

.table-responsive {
    overflow-x: auto;
}

.d-inline {
    display: inline;
}

.m-0 {
    margin: 0;
}

.form-label {
    display: block;
    margin-bottom: 0.25rem;
}

.ps-3 {
    padding-left: 1rem;
}

.mt-3 {
    margin-top: 1rem;
}

.pagination {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    list-style: none;
    padding: 0;
    margin: 1rem 0 0;
}

.pagination .page-item .page-link {
    display: block;
    padding: 0.4rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    text-decoration: none;
    color: var(--accent);
    background: #fff;
}

.pagination .page-item.active .page-link {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.pagination .page-item.disabled .page-link {
    opacity: 0.45;
    pointer-events: none;
}

@media (max-width: 992px) {
    .admin-shell {
        flex-direction: column;
    }

    .admin-sidebar {
        position: relative;
        width: 100%;
        min-height: unset;
    }

    .admin-nav {
        display: flex;
        flex-wrap: wrap;
        gap: 0.25rem;
        padding: 0.5rem;
    }

    .admin-nav a {
        border-left: none;
        border-radius: 8px;
        padding: 0.5rem 0.85rem;
    }

    .admin-nav a.active {
        border-left: none;
    }
}

/* —— 聊天记录监控（单聊 / 群聊 九宫格） —— */
.chat-history-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    align-items: stretch;
}

@media (max-width: 1200px) {
    .chat-history-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 720px) {
    .chat-history-grid {
        grid-template-columns: 1fr;
    }
}

.chat-monitor-form {
    flex-wrap: wrap;
    align-items: flex-end;
}

.chat-window-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    min-height: 280px;
    overflow: hidden;
}

.chat-window-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.35rem 0.6rem;
    border-bottom: 1px solid var(--border);
    background: #fafbfc;
    gap: 0.5rem;
}

.chat-window-slot {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 240px;
}

.chat-window-loading,
.chat-window-error {
    padding: 1.25rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.chat-window-error {
    color: var(--danger);
}

.chat-c2c-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.35rem;
    padding: 0.65rem 0.5rem 0.5rem;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(180deg, #fafafa 0%, #fff 100%);
}

.chat-c2c-party {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    min-width: 0;
    flex: 1;
}

.chat-c2c-party-right {
    flex-direction: row;
    justify-content: flex-end;
    text-align: right;
}

.chat-c2c-party-right .chat-c2c-meta {
    align-items: flex-end;
}

.chat-c2c-meta {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.chat-c2c-name {
    font-weight: 600;
    font-size: 0.82rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 7rem;
}

.chat-c2c-id {
    font-size: 0.68rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 7rem;
}

.chat-c2c-center {
    flex-shrink: 0;
    text-align: center;
    padding: 0 0.2rem;
}

.chat-c2c-time {
    font-size: 0.68rem;
    color: var(--text-muted);
    display: block;
    margin-bottom: 0.2rem;
    white-space: nowrap;
}

.chat-msg-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 600;
    padding: 0.12rem 0.45rem;
    border-radius: 999px;
    background: #d1fae5;
    color: #047857;
}

.chat-group-head {
    padding: 0.65rem 0.75rem 0.5rem;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(180deg, #fafafa 0%, #fff 100%);
}

.chat-group-title {
    font-weight: 700;
    font-size: 0.9rem;
}

.chat-group-sub {
    font-size: 0.72rem;
    margin-top: 0.15rem;
    word-break: break-all;
}

.chat-group-center {
    margin-top: 0.45rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem;
}

.chat-window-body {
    flex: 1;
    padding: 0.5rem 0.6rem 0.75rem;
    overflow: auto;
    max-height: 360px;
}

.chat-top-pill {
    text-align: center;
    margin-bottom: 0.65rem;
    display: inline-block;
    margin-left: 50%;
    transform: translateX(-50%);
    font-size: 0.68rem;
    color: var(--text-muted);
    background: #f1f5f9;
    padding: 0.2rem 0.65rem;
    border-radius: 999px;
}

.chat-top-pill-muted {
    background: #fff7ed;
    color: #9a3412;
}

.chat-msg-list {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}

.chat-msg-row {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    max-width: 100%;
}

.chat-msg-row-left {
    align-items: flex-start;
}

.chat-msg-row-right {
    align-items: flex-end;
}

.chat-msg-row-group {
    flex-direction: row;
    align-items: flex-start;
    gap: 0.45rem;
}

.chat-group-msg-block {
    flex: 1;
    min-width: 0;
}

.chat-msg-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.68rem;
    margin-bottom: 0.15rem;
}

.chat-msg-row-right .chat-msg-meta {
    flex-direction: row-reverse;
}

.chat-msg-nick {
    font-weight: 600;
    color: var(--text);
}

.chat-bubble {
    display: inline-block;
    max-width: 100%;
    padding: 0.45rem 0.6rem;
    border-radius: 12px;
    font-size: 0.8rem;
    line-height: 1.45;
    word-break: break-word;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.06);
}

.chat-bubble-peer {
    background: #fff;
    border: 1px solid var(--border);
}

.chat-bubble-me {
    background: #d1fae5;
    border: 1px solid #a7f3d0;
}

.chat-bubble-inner {
    min-width: 0;
}

.chat-bubble-inner .chat-msg-part + .chat-msg-part {
    margin-top: 0.35rem;
}

.chat-msg-img {
    max-width: min(220px, 100%);
    height: auto;
    display: block;
    border-radius: 8px;
    margin-top: 0.25rem;
}

.chat-msg-video-el {
    max-width: min(260px, 100%);
    max-height: 200px;
    display: block;
    border-radius: 8px;
    margin-top: 0.25rem;
    background: #0f172a;
}

.chat-msg-audio {
    display: block;
    width: min(240px, 100%);
    max-width: 100%;
    margin-top: 0.35rem;
}

.chat-msg-caption {
    margin-bottom: 0.1rem;
}

.chat-msg-badge-soft {
    display: inline-block;
    padding: 0.12rem 0.45rem;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 600;
    background: rgba(15, 23, 42, 0.06);
    color: var(--text);
}

.chat-msg-revoked {
    margin-top: 0.35rem;
}

.chat-msg-custom-data {
    margin: 0.35rem 0 0;
    padding: 0.35rem 0.45rem;
    background: rgba(15, 23, 42, 0.04);
    border-radius: 6px;
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 120px;
    overflow: auto;
}

.chat-av {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
    background: #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
    color: #475569;
}

.chat-av-sm {
    width: 28px;
    height: 28px;
    font-size: 0.72rem;
}

.chat-av-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.chat-av-letter {
    display: block;
    line-height: 1;
}