:root {
    --ui-bg: #f4f7fb;
    --ui-surface: #ffffff;
    --ui-surface-soft: #f8fafc;
    --ui-border: #dfe7f1;
    --ui-border-strong: #cfd9e8;
    --ui-text: #172033;
    --ui-muted: #667085;
    --ui-primary: #2563eb;
    --ui-primary-dark: #1d4ed8;
    --ui-primary-soft: #eff6ff;
    --ui-success: #059669;
    --ui-warning: #d97706;
    --ui-danger: #dc2626;
    --ui-shadow: 0 10px 28px rgba(15, 23, 42, 0.09);
    --ui-shadow-soft: 0 4px 14px rgba(15, 23, 42, 0.07);
    --ui-radius: 8px;
}

* {
    letter-spacing: 0;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    color: var(--ui-text);
    background: linear-gradient(135deg, #f6f8fc 0%, #e8f2ff 48%, #f8fbff 100%);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

a {
    color: var(--ui-primary);
    transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: 38px;
    border-radius: var(--ui-radius);
    font-weight: 650;
    line-height: 1.2;
    box-shadow: none;
    transition: transform 0.16s ease, box-shadow 0.16s ease, background-color 0.16s ease, border-color 0.16s ease, color 0.16s ease;
}

.btn:focus-visible,
.btn-close:focus,
.page-link:focus {
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.18);
}

.btn i {
    line-height: 1;
}

.btn:hover:not(:disabled),
.btn:focus-visible:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--ui-shadow-soft);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: none;
}

.btn-sm {
    min-height: 32px;
    padding: 0.35rem 0.7rem;
}

.btn-lg {
    min-height: 46px;
}

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

.btn-save,
.admin-settings-page .admin-upload-limit-save {
    background: linear-gradient(135deg, #2563eb 0%, #0891b2 100%) !important;
    border: 0 !important;
    color: #fff !important;
}

.btn-primary:hover,
.btn-primary:focus {
    background: var(--ui-primary-dark);
    border-color: var(--ui-primary-dark);
    color: #fff;
}

.btn-success {
    background: var(--ui-success);
    border-color: var(--ui-success);
}

.btn-warning {
    background: #f59e0b;
    border-color: #f59e0b;
    color: #1f2937;
}

.btn-danger {
    background: var(--ui-danger);
    border-color: var(--ui-danger);
}

.btn-light,
.btn-outline-secondary {
    border-color: var(--ui-border);
    color: #344054;
    background-color: #fff;
}

.btn-light:hover,
.btn-outline-secondary:hover {
    background: #f8fafc;
    border-color: #cbd5e1;
    color: #1f2937;
}

.btn-outline-primary {
    border-color: #b9d3ff;
    color: var(--ui-primary);
}

.btn-outline-primary:hover {
    background: #eff6ff;
    border-color: #93c5fd;
    color: var(--ui-primary-dark);
}

.btn-link {
    min-height: auto;
    color: var(--ui-primary);
    font-weight: 650;
    text-decoration: none;
}

.btn-link:hover {
    color: var(--ui-primary-dark);
    text-decoration: underline;
    box-shadow: none;
}

.btn-outline-success {
    border-color: #a7f3d0;
    color: #047857;
}

.btn-outline-success:hover {
    background: #ecfdf5;
    color: #047857;
}

.btn-outline-warning {
    border-color: #fed7aa;
    color: #b45309;
}

.btn-outline-warning:hover {
    background: #fff7ed;
    color: #92400e;
}

.btn-outline-danger {
    border-color: #fecaca;
    color: #b91c1c;
}

.btn-outline-danger:hover {
    background: #fff1f2;
    color: #991b1b;
}

.btn-group {
    gap: 6px;
}

.btn-group > .btn,
.btn-group > a.btn,
.btn-group > form > .btn {
    border-radius: var(--ui-radius) !important;
}

.form-control,
.form-select,
.input-group-text {
    min-height: 40px;
    border-color: var(--ui-border);
    border-radius: var(--ui-radius);
    color: var(--ui-text);
}

.form-control::placeholder {
    color: #98a2b3;
}

.input-group-text {
    background: #f8fafc;
}

.form-control,
.form-select {
    background-color: #fff;
    box-shadow: none;
    transition: border-color 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.form-control:focus,
.form-select:focus {
    border-color: #93c5fd;
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.14);
}

.input-group > .form-control,
.input-group > .form-select,
.input-group > .input-group-text {
    border-radius: var(--ui-radius);
}

.input-group > :not(:first-child) {
    margin-left: -1px;
}

.form-label {
    color: #344054;
    font-weight: 650;
}

.form-text,
.text-muted {
    color: var(--ui-muted) !important;
}

.card,
.panel,
.profile-card,
.settings-card,
.stat-card,
.user-table,
.guest-table,
.ip-table,
.add-ip-form {
    border: 1px solid var(--ui-border) !important;
    border-radius: var(--ui-radius) !important;
    box-shadow: var(--ui-shadow) !important;
}

.card,
.panel,
.profile-card,
.settings-card,
.stat-card,
.user-table,
.guest-table,
.ip-table,
.add-ip-form,
.modal-content,
.room-lock-panel {
    background: rgba(255, 255, 255, 0.98) !important;
}

.card-header,
.modal-header {
    background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    border-bottom-color: #eef2f7;
}

.card-body,
.modal-body {
    color: var(--ui-text);
}

.alert {
    border: 1px solid transparent;
    border-radius: var(--ui-radius);
}

.dropdown-menu {
    border: 1px solid var(--ui-border);
    border-radius: 10px;
    box-shadow: 0 16px 42px rgba(15, 23, 42, 0.14);
}

.dropdown-item {
    border-radius: 7px;
}

.dropdown-item:active,
.dropdown-item:hover,
.dropdown-item:focus {
    background: var(--ui-primary-soft);
    color: var(--ui-primary-dark);
}

.alert-success {
    background: #ecfdf5;
    border-color: #a7f3d0;
    color: #047857;
}

.alert-danger {
    background: #fff1f2;
    border-color: #fecdd3;
    color: #be123c;
}

.alert-warning {
    background: #fff7ed;
    border-color: #fed7aa;
    color: #9a3412;
}

.alert-info {
    background: #eff6ff;
    border-color: #bfdbfe;
    color: #1d4ed8;
}

.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    min-height: 22px;
    border-radius: 999px;
    font-weight: 700;
    line-height: 1;
}

.private-reminder {
    min-width: 44px;
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: 5px 8px;
    border: 1px solid rgba(226, 232, 240, 0.85);
    border-radius: var(--ui-radius);
    background: #fff;
    color: #111827;
    cursor: pointer;
    transition: background-color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.private-reminder:hover {
    border-color: #b9d3ff;
    background: var(--ui-primary-soft);
    color: var(--ui-primary-dark);
    box-shadow: var(--ui-shadow-soft);
    transform: translateY(-1px);
}

.private-reminder .badge {
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
}

.private-reminder .badge.is-zero {
    background: #e5e7eb !important;
    color: #667085;
}

.table-responsive {
    border-radius: var(--ui-radius);
    border: 1px solid rgba(226, 232, 240, 0.78);
}

.table {
    color: var(--ui-text);
    margin-bottom: 0;
}

.table thead th {
    background: var(--ui-surface-soft);
    border-bottom-color: var(--ui-border-strong) !important;
    color: #111827;
    font-weight: 800;
    white-space: nowrap;
}

.table tbody td {
    border-bottom-color: #eef2f7 !important;
    vertical-align: middle;
}

.table-hover tbody tr:hover {
    background: #f8fbff;
}

.modal-content {
    border: 1px solid var(--ui-border);
    border-radius: 10px;
    box-shadow: 0 22px 60px rgba(15, 23, 42, 0.22);
}

.modal-footer {
    border-top-color: #eef2f7;
}

.pagination {
    gap: 6px;
}

.page-link {
    min-width: 36px;
    border-color: var(--ui-border);
    border-radius: var(--ui-radius) !important;
    color: var(--ui-primary);
    text-align: center;
}

.page-item.active .page-link {
    background: var(--ui-primary);
    border-color: var(--ui-primary);
}

.page-item.disabled .page-link {
    color: #98a2b3;
}

.navbar {
    border-bottom: 1px solid rgba(226, 232, 240, 0.72);
    background: rgba(255, 255, 255, 0.9) !important;
    backdrop-filter: blur(14px);
}

.navbar-brand {
    color: #101828 !important;
    font-weight: 800;
}

.menu-toggle,
.toggle-users,
.mobile-more-toggle,
.admin-menu-toggle,
.pm-close-btn,
.close-users-list,
.clear-attachment {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.chat-container {
    border: 1px solid rgba(226, 232, 240, 0.78);
    border-radius: var(--ui-radius) !important;
    box-shadow: var(--ui-shadow) !important;
}

.chat-area {
    border: 1px solid rgba(226, 232, 240, 0.78);
    border-radius: var(--ui-radius) !important;
    box-shadow: var(--ui-shadow) !important;
}

.message-content {
    border: 1px solid rgba(226, 232, 240, 0.76);
}

.message-self .message-content,
.message-self .message-bubble {
    background: linear-gradient(135deg, #2563eb 0%, #0891b2 100%) !important;
}

.message-self .message-content {
    border-color: rgba(37, 99, 235, 0.18);
}

.message-input-container {
    box-shadow: 0 -8px 24px rgba(28, 43, 68, 0.08);
    border-top-color: #e8eef7 !important;
}

.compose-icon-btn,
.pm-close-btn,
.menu-toggle,
.toggle-users,
.mobile-more-toggle,
.close-users-list,
.admin-menu-toggle,
.clear-attachment {
    border-radius: var(--ui-radius) !important;
}

.compose-icon-btn,
.pm-close-btn,
.menu-toggle,
.toggle-users,
.mobile-more-toggle,
.close-users-list,
.clear-attachment {
    border: 1px solid rgba(226, 232, 240, 0.9) !important;
    background: #fff !important;
    color: #344054 !important;
}

.compose-send-btn,
.compose-send-btn:hover:not(:disabled) {
    background: var(--ui-primary) !important;
    border-color: var(--ui-primary) !important;
    color: #fff !important;
}

.compose-icon-btn:hover:not(:disabled),
.pm-close-btn:hover,
.menu-toggle:hover,
.toggle-users:hover,
.mobile-more-toggle:hover,
.close-users-list:hover,
.clear-attachment:hover {
    box-shadow: var(--ui-shadow-soft);
}

.compose-more-panel,
.compose-emoji-panel,
.attachment-preview,
.room-announcement-bar,
.guest-readonly-notice,
.room-mute-notice,
.share-link-panel,
.share-modal-intro,
.room-switch-item,
.room-file-item,
.room-muted-item,
.pm-file-card {
    border: 1px solid var(--ui-border) !important;
    border-radius: var(--ui-radius) !important;
    background: #fff !important;
}

.compose-more-item i,
.share-room-icon,
.room-lock-icon {
    border-radius: var(--ui-radius) !important;
    background: var(--ui-primary) !important;
    color: #fff !important;
}

.compose-emoji-btn:hover,
.room-switch-item:hover {
    background: var(--ui-primary-soft) !important;
}

.online-users,
.sidebar {
    box-shadow: var(--ui-shadow) !important;
}

.online-users-header,
.sidebar-header {
    border-bottom-color: rgba(226, 232, 240, 0.88) !important;
}

.menu-item {
    border-radius: var(--ui-radius) !important;
    transition: background-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.menu-item:hover {
    transform: translateX(2px);
    background: var(--ui-primary-soft) !important;
    color: var(--ui-primary-dark) !important;
}

.user-item,
.room-switch-item {
    transition: background-color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.user-item:hover {
    background: #f8fbff !important;
}

.admin-private-user-list {
    display: grid;
    gap: 10px;
}

.private-conversation-list {
    display: grid;
    gap: 10px;
}

.private-conversation-item {
    width: 100%;
    min-height: 74px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border: 1px solid var(--ui-border);
    border-radius: var(--ui-radius);
    background: #fff;
    color: var(--ui-text);
    text-align: left;
    cursor: pointer;
    transition: background-color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.private-conversation-item:hover {
    border-color: #b9d3ff;
    background: var(--ui-primary-soft);
    box-shadow: var(--ui-shadow-soft);
    transform: translateY(-1px);
}

.private-conversation-avatar-wrap {
    flex: 0 0 46px;
}

.private-conversation-avatar-wrap img {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid #fff;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.12);
}

.private-conversation-main {
    min-width: 0;
    flex: 1;
    display: grid;
    gap: 3px;
}

.private-conversation-top {
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.private-conversation-name,
.private-conversation-preview,
.private-conversation-meta {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.private-conversation-name {
    color: #111827;
    font-weight: 800;
}

.private-conversation-time,
.private-conversation-meta {
    color: var(--ui-muted);
    font-size: 0.76rem;
}

.private-conversation-preview {
    color: #475467;
    font-size: 0.9rem;
}

.private-conversation-unread {
    flex: 0 0 auto;
}

.admin-private-user-item {
    width: 100%;
    min-height: 62px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border: 1px solid var(--ui-border);
    border-radius: var(--ui-radius);
    background: #fff;
    color: var(--ui-text);
    text-align: left;
    cursor: pointer;
    transition: background-color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.admin-private-user-item:hover {
    border-color: #b9d3ff;
    background: var(--ui-primary-soft);
    box-shadow: var(--ui-shadow-soft);
    transform: translateY(-1px);
}

.admin-private-user-avatar-wrap {
    position: relative;
    flex: 0 0 42px;
}

.admin-private-user-avatar-wrap img {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid #fff;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.12);
}

.admin-private-user-main {
    min-width: 0;
    flex: 1;
    display: grid;
    gap: 2px;
}

.admin-private-user-name,
.admin-private-user-meta {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.admin-private-user-name {
    font-weight: 750;
}

.admin-private-user-meta {
    color: var(--ui-muted);
    font-size: 0.82rem;
}

.admin-private-user-badges {
    display: inline-flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 6px;
    max-width: 45%;
}

.admin-private-user-title {
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    padding: 3px 8px;
    border-radius: 999px;
    background: #f8fafc;
    color: #475467;
    font-size: 0.75rem;
    font-weight: 700;
}

.admin-menu-toggle {
    background: rgba(255, 255, 255, 0.12) !important;
    color: #fff !important;
    border-color: rgba(255, 255, 255, 0.16) !important;
}

.admin-mobile-bar,
.col-md-2.sidebar {
    background: linear-gradient(180deg, #1f2937 0%, #111827 100%) !important;
}

.sidebar:not(.col-md-2) {
    background: rgba(255, 255, 255, 0.98) !important;
}

.sidebar:not(.col-md-2) .menu-item {
    color: #344054 !important;
}

.sidebar:not(.col-md-2) .user-name {
    color: var(--ui-text) !important;
}

.sidebar:not(.col-md-2) .user-id {
    color: var(--ui-muted) !important;
}

.sidebar .nav-link {
    border-radius: var(--ui-radius) !important;
}

.sidebar .nav-link.active {
    background: linear-gradient(135deg, #2563eb 0%, #0891b2 100%) !important;
}

.col-md-10.p-4:not(.admin-settings-page),
.admin-settings-page {
    background: transparent;
}

.users-page-head,
.col-md-10.p-4 > .d-flex.justify-content-between.align-items-center.mb-4 {
    padding: 14px 16px;
    border: 1px solid rgba(226, 232, 240, 0.78);
    border-radius: var(--ui-radius);
    background: rgba(255, 255, 255, 0.82);
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
}

.admin-dashboard-main .admin-dashboard-header {
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
}

.admin-dashboard-main .sidebar,
.admin-dashboard-main .card,
.admin-dashboard-main .panel {
    background: initial !important;
}

.auth-polish {
    display: flex;
    align-items: center;
    min-height: 100vh;
    padding: 24px 0;
}

.auth-polish .container {
    margin-top: 0 !important;
}

.auth-polish .card {
    overflow: hidden;
    border-radius: 10px !important;
}

.auth-polish .card-header {
    background: linear-gradient(135deg, #ffffff 0%, #f8fbff 100%) !important;
}

.auth-polish .card-header i {
    color: var(--ui-primary);
}

.profile-header {
    background: linear-gradient(135deg, #2563eb 0%, #0891b2 100%) !important;
}

.profile-card:hover {
    transform: translateY(-2px) !important;
}

.password-section {
    border: 1px solid var(--ui-border);
    border-radius: var(--ui-radius) !important;
    background: #f8fafc !important;
}

.avatar-upload {
    color: var(--ui-primary);
}

.avatar-upload:hover {
    background: var(--ui-primary) !important;
}

@media (max-width: 767.98px) {
    body {
        background: #f6f8fc;
    }

    .btn {
        min-height: 40px;
    }

    .btn-sm {
        min-height: 34px;
    }

    .card,
    .panel,
    .profile-card {
        border-radius: 8px !important;
    }

    .modal-footer .btn {
        flex: 1 1 auto;
    }

    .auth-polish {
        padding: 16px 0;
    }

    .users-page-head,
    .col-md-10.p-4 > .d-flex.justify-content-between.align-items-center.mb-4 {
        padding: 12px;
    }

    .admin-private-user-item {
        align-items: flex-start;
    }

    .admin-private-user-badges {
        max-width: none;
    }
}