/* ==========================================================================
   KB Learning — Admin Portal Shared Styles
   app.css — Layout: sidebar, header, footer, toaster, modals
   ========================================================================== */

/* ---- Variables ---- */
:root {
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 70px;
    --sidebar-bg: #0f172a;
    --sidebar-bg-end: #1e293b;
    --sidebar-hover: rgba(255,255,255,0.07);
    --sidebar-active: #8852F8;
    --sidebar-active-bg: rgba(136,82,248,0.15);
    --sidebar-text: #94a3b8;
    --sidebar-text-active: #f1f5f9;
    --header-height: 64px;
    --footer-height: 50px;
    --primary: #8852F8;
    --primary-dark: #4A31B6;
    --primary-light: #f3eeff;
    --primary-orange: #FF8A26;
    --primary-coral: #F76D4A;
    --primary-teal: #2BB7AE;
    --success: #2BB7AE;
    --danger: #ef4444;
    --warning: #FF8A26;
    --info: #8852F8;
    --body-bg: #f0f4f8;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 4px 16px rgba(0,0,0,0.07), 0 1px 4px rgba(0,0,0,0.04);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.10), 0 2px 6px rgba(0,0,0,0.05);
    --radius: 10px;
    --radius-sm: 6px;
    --transition: 0.25s ease;
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; }

body { margin: 0; padding: 0; font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; color: var(--text-primary); }

/* ---- Auth Body ---- */
.auth-body {
    background: linear-gradient(135deg, #0f172a 0%, #1e0b3e 60%, #2d1b69 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ---- Admin Layout ---- */
.admin-body {
    background: var(--body-bg);
    min-height: 100vh;
    display: flex;
    overflow-x: hidden;
}

/* ---- Sidebar ---- */
.admin-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: var(--sidebar-width);
    background: linear-gradient(180deg, var(--sidebar-bg) 0%, var(--sidebar-bg-end) 100%);
    display: flex;
    flex-direction: column;
    transition: width var(--transition);
    z-index: 1000;
    overflow: hidden;
    border-right: 1px solid rgba(255,255,255,0.04);
}

.admin-sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

/* Sidebar Header */
.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    height: var(--header-height);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    flex-shrink: 0;
}

.sidebar-brand { display: flex; align-items: center; text-decoration: none; overflow: hidden; }

.sidebar-logo-full {
    height: 34px;
    width: auto;
    transition: opacity var(--transition), width var(--transition);
    opacity: 1;
}

.sidebar-logo-icon {
    height: 34px;
    width: 34px;
    opacity: 0;
    position: absolute;
    transition: opacity var(--transition);
}

.admin-sidebar.collapsed .sidebar-logo-full { opacity: 0; width: 0; }
.admin-sidebar.collapsed .sidebar-logo-icon { opacity: 1; position: static; }

.sidebar-toggle-btn {
    background: none;
    border: none;
    color: var(--sidebar-text);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    transition: background var(--transition), color var(--transition);
    flex-shrink: 0;
    line-height: 1;
}

.sidebar-toggle-btn:hover { background: var(--sidebar-hover); color: var(--sidebar-text-active); }

/* Sidebar Navigation */
.sidebar-nav { flex: 1; overflow-y: auto; overflow-x: hidden; padding: 10px 8px; }
.sidebar-nav::-webkit-scrollbar { width: 3px; }
.sidebar-nav::-webkit-scrollbar-track { background: transparent; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 4px; }

.sidebar-menu { list-style: none; margin: 0; padding: 0; }

/* Sidebar section label */
.sidebar-section-label {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: rgba(148,163,184,0.5);
    padding: 16px 12px 4px;
    white-space: nowrap;
    overflow: hidden;
    transition: opacity var(--transition);
}

.admin-sidebar.collapsed .sidebar-section-label { opacity: 0; }

.sidebar-link {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    color: var(--sidebar-text);
    text-decoration: none;
    transition: background var(--transition), color var(--transition);
    white-space: nowrap;
    overflow: hidden;
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    border-radius: var(--radius-sm);
    margin-bottom: 2px;
}

.sidebar-link:hover {
    background: var(--sidebar-hover);
    color: var(--sidebar-text-active);
}

.sidebar-item.active > .sidebar-link {
    background: var(--sidebar-active-bg);
    color: var(--sidebar-text-active);
}

.sidebar-item.active > .sidebar-link .sidebar-icon {
    color: var(--sidebar-active);
}

.sidebar-icon {
    font-size: 15px;
    width: 20px;
    flex-shrink: 0;
    text-align: center;
    transition: color var(--transition);
}

.sidebar-label {
    margin-left: 10px;
    font-size: 13.5px;
    font-weight: 500;
    transition: opacity var(--transition), width var(--transition);
    white-space: nowrap;
}

.admin-sidebar.collapsed .sidebar-label { opacity: 0; width: 0; overflow: hidden; }

/* Sidebar Arrow */
.sidebar-arrow {
    margin-left: auto;
    font-size: 10px;
    transition: transform var(--transition), opacity var(--transition);
    color: rgba(148,163,184,0.5);
}

.sidebar-has-children.open > .sidebar-link .sidebar-arrow { transform: rotate(180deg); }
.admin-sidebar.collapsed .sidebar-arrow { opacity: 0; }

/* Sidebar Badge (pending count) */
.sidebar-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    background: #ef4444;
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    border-radius: 50px;
    margin-left: auto;
    margin-right: 6px;
    flex-shrink: 0;
}

.submenu-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    background: #ef4444;
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    border-radius: 50px;
    margin-left: 6px;
    vertical-align: middle;
    flex-shrink: 0;
}

.admin-sidebar.collapsed .sidebar-badge { display: none; }

/* Sidebar Submenu */
.sidebar-submenu {
    list-style: none;
    margin: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.sidebar-has-children.open .sidebar-submenu { max-height: 600px; }
.admin-sidebar.collapsed .sidebar-submenu { max-height: 0; }

.sidebar-sublink {
    display: flex;
    align-items: center;
    padding: 9px 12px 9px 28px;
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 13px;
    transition: background var(--transition), color var(--transition);
    white-space: nowrap;
    overflow: hidden;
    border-radius: var(--radius-sm);
    margin-bottom: 2px;
}

.sidebar-sublink:hover {
    background: var(--sidebar-hover);
    color: var(--sidebar-text-active);
}

.sidebar-subitem.active .sidebar-sublink {
    background: var(--sidebar-active-bg);
    color: var(--sidebar-active);
    font-weight: 500;
}

.admin-sidebar.collapsed .sidebar-sublink { padding-left: 12px; }

/* Sidebar Footer (profile) */
.sidebar-footer {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 12px 8px;
    flex-shrink: 0;
    overflow: hidden;
}

.sidebar-profile-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    gap: 10px;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.sidebar-profile-link:hover { background: var(--sidebar-hover); }

.sidebar-avatar { color: var(--sidebar-text); font-size: 30px; flex-shrink: 0; }

.sidebar-profile-info { overflow: hidden; }

.sidebar-profile-name {
    display: block;
    color: var(--sidebar-text-active);
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: opacity var(--transition);
}

.sidebar-profile-role {
    display: block;
    color: var(--sidebar-text);
    font-size: 11px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: opacity var(--transition);
}

.admin-sidebar.collapsed .sidebar-profile-info { opacity: 0; width: 0; }

/* ---- Main Content Area ---- */
.admin-main {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left var(--transition);
    width: calc(100% - var(--sidebar-width));
}

.admin-sidebar.collapsed ~ .admin-main,
body.sidebar-collapsed .admin-main {
    margin-left: var(--sidebar-collapsed-width);
    width: calc(100% - var(--sidebar-collapsed-width));
}

/* ---- Header ---- */
.admin-header {
    position: sticky;
    top: 0;
    z-index: 900;
    height: var(--header-height);
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
}

.header-left { display: flex; align-items: center; gap: 16px; }

.header-toggle-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    color: var(--text-primary);
    padding: 6px;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.header-toggle-btn:hover { background: var(--body-bg); }

.header-page-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.header-right { display: flex; align-items: center; gap: 12px; }

/* User Menu */
.header-user-menu { position: relative; }

.header-user-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 6px 12px;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 13.5px;
    transition: background var(--transition), border-color var(--transition);
}

.header-user-btn:hover { background: var(--body-bg); border-color: #cbd5e1; }

.header-user-avatar { font-size: 22px; color: var(--primary); }

.header-user-name { font-weight: 500; max-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.header-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    min-width: 190px;
    z-index: 1000;
    display: none;
    overflow: hidden;
}

.header-dropdown.show { display: block; }

.header-dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 13.5px;
    background: none;
    border: none;
    width: 100%;
    cursor: pointer;
    transition: background var(--transition);
}

.header-dropdown-item:hover { background: var(--body-bg); color: var(--text-primary); }

.header-dropdown-divider { border-top: 1px solid var(--border-color); margin: 4px 0; }

.header-dropdown-logout { color: var(--danger); }
.header-dropdown-logout:hover { background: #fef2f2; }

/* ---- Page Content ---- */
.admin-content {
    flex: 1;
    padding: 24px;
    padding-bottom: calc(var(--footer-height) + 24px);
    min-height: 0;
}

/* ---- Footer ---- */
.admin-footer {
    position: fixed;
    bottom: 0;
    right: 0;
    left: var(--sidebar-width);
    height: var(--footer-height);
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(8px);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    font-size: 12px;
    color: var(--text-muted);
    z-index: 800;
    transition: left var(--transition);
}

.admin-sidebar.collapsed ~ .admin-main .admin-footer,
body.sidebar-collapsed .admin-footer {
    left: var(--sidebar-collapsed-width);
}

.footer-copyright { font-weight: 500; }

.footer-developer-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.footer-developer-link:hover { text-decoration: underline; }

/* ---- Page Common Styles ---- */
.page-container { max-width: 1440px; }

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.page-heading {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    letter-spacing: -0.3px;
}

/* ---- Cards ---- */
.card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    background: var(--card-bg);
    transition: box-shadow var(--transition);
}

.card:hover { box-shadow: var(--shadow); }

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    background: transparent;
}

.card-title { margin: 0; font-size: 15px; font-weight: 600; color: var(--text-primary); }
.card-body { padding: 20px; }

.data-card .card-body { padding: 0; }
.data-card .table-responsive { border-radius: var(--radius); overflow: hidden; }

/* ---- Tables ---- */
.data-table { margin: 0; font-size: 13.5px; }
.data-table thead { background: #f8fafc; }
.data-table thead th {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 11.5px;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    padding: 12px 16px;
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
}
.data-table tbody td {
    padding: 13px 16px;
    color: var(--text-primary);
    vertical-align: middle;
    border-bottom: 1px solid #f1f5f9;
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: #fafbff; }

/* ---- Badges ---- */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11.5px;
    font-weight: 600;
    letter-spacing: 0.2px;
}

.badge-active   { background: #d1fae5; color: #065f46; }
.badge-inactive { background: #fee2e2; color: #991b1b; }
.badge-role     { background: #eff6ff; color: #1d4ed8; font-size: 12px; padding: 3px 9px; border-radius: 6px; font-weight: 500; }
.badge-count    { background: #f1f5f9; color: var(--text-primary); font-size: 13px; font-weight: 600; padding: 2px 9px; border-radius: 6px; }

/* ---- Action Buttons ---- */
.action-buttons { display: flex; gap: 5px; align-items: center; }

.btn-edit {
    background: #eff6ff;
    color: #1d4ed8;
    border: 1px solid #bfdbfe;
    border-radius: var(--radius-sm);
}
.btn-edit:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

.btn-activate {
    background: #f0fdf4;
    color: #15803d;
    border: 1px solid #bbf7d0;
    border-radius: var(--radius-sm);
}
.btn-activate:hover { background: var(--success); color: #fff; border-color: var(--success); }

.btn-deactivate {
    background: #fff1f2;
    color: #b91c1c;
    border: 1px solid #fecaca;
    border-radius: var(--radius-sm);
}
.btn-deactivate:hover { background: var(--danger); color: #fff; border-color: var(--danger); }

.btn-view {
    background: #f0fdfa;
    color: #0f766e;
    border: 1px solid #99f6e4;
    border-radius: var(--radius-sm);
}
.btn-view:hover { background: var(--info); color: #fff; border-color: var(--info); }

/* Transition for all action buttons */
.action-buttons .btn { transition: background var(--transition), color var(--transition), border-color var(--transition), transform 0.15s ease; }
.action-buttons .btn:hover { transform: translateY(-1px); }

/* ---- Forms ---- */
.form-card { max-width: 1000px; }
.form-group { margin-bottom: 20px; }
.form-label { font-weight: 500; font-size: 13.5px; color: var(--text-primary); margin-bottom: 6px; display: block; }
.required-label::after { content: ' *'; color: var(--danger); }

.form-control, .form-select {
    font-size: 14px;
    border-color: var(--border-color);
    border-radius: var(--radius-sm);
    padding: 9px 12px;
    color: var(--text-primary);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.12);
}

.form-hint { font-size: 12px; color: var(--text-muted); margin-top: 5px; }

.form-actions {
    display: flex;
    gap: 10px;
    padding-top: 12px;
    margin-top: 12px;
    border-top: 1px solid var(--border-color);
}

.form-section-divider {
    display: flex;
    align-items: center;
    margin: 20px 0;
    gap: 12px;
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-section-divider::before,
.form-section-divider::after {
    content: '';
    flex: 1;
    border-top: 1px solid var(--border-color);
}

/* ---- Buttons ---- */
.btn {
    font-size: 13.5px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition), transform 0.15s ease;
}

.btn:active { transform: translateY(0) !important; }

.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}
.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(59,130,246,0.3);
}

.btn-secondary {
    background: #f1f5f9;
    border-color: var(--border-color);
    color: var(--text-primary);
}
.btn-secondary:hover {
    background: #e2e8f0;
    border-color: #cbd5e1;
    color: var(--text-primary);
}

/* ---- Empty State ---- */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 64px 20px;
    color: var(--text-muted);
}

.empty-state-icon { font-size: 52px; margin-bottom: 18px; opacity: 0.3; }
.empty-state p { font-size: 15px; margin: 0; }

/* ---- Toaster ---- */
#toaster-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 370px;
}

.toaster-item {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 14px 16px;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: flex-start;
    gap: 12px;
    animation: toasterSlideIn 0.3s cubic-bezier(0.34,1.56,0.64,1);
    border-left: 4px solid transparent;
}

.toaster-item.toaster-success { border-left-color: var(--success); }
.toaster-item.toaster-error   { border-left-color: var(--danger);  }
.toaster-item.toaster-warning { border-left-color: var(--warning); }
.toaster-item.toaster-info    { border-left-color: var(--info);    }

.toaster-icon { font-size: 17px; flex-shrink: 0; margin-top: 1px; }
.toaster-success .toaster-icon { color: var(--success); }
.toaster-error   .toaster-icon { color: var(--danger);  }
.toaster-warning .toaster-icon { color: var(--warning); }
.toaster-info    .toaster-icon { color: var(--info);    }

.toaster-body { flex: 1; }
.toaster-message { font-size: 13.5px; color: var(--text-primary); margin: 0; font-weight: 500; }

.toaster-close {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 13px;
    padding: 0;
    flex-shrink: 0;
    line-height: 1;
}

.toaster-close:hover { color: var(--text-primary); }

.toaster-item.toaster-hiding { animation: toasterSlideOut 0.25s ease forwards; }

@keyframes toasterSlideIn {
    from { transform: translateX(110%); opacity: 0; }
    to   { transform: translateX(0);    opacity: 1; }
}

@keyframes toasterSlideOut {
    from { transform: translateX(0);    opacity: 1; }
    to   { transform: translateX(110%); opacity: 0; }
}

/* ---- Password Toggle ---- */
.password-toggle {
    cursor: pointer;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-left: none;
    color: var(--text-muted);
    transition: color var(--transition);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.password-toggle:hover { color: var(--primary); }

/* ---- Role Slug ---- */
.role-slug {
    background: #f1f5f9;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    color: var(--text-muted);
    font-family: 'Courier New', monospace;
}

/* ---- Alert improvements ---- */
.alert { border-radius: var(--radius-sm); font-size: 13.5px; border: none; }
.alert-danger { background: #fef2f2; color: #991b1b; border-left: 4px solid var(--danger); }
.alert-success { background: #f0fdf4; color: #15803d; border-left: 4px solid var(--success); }

/* ---- Modals ---- */
.modal-content { border: none; border-radius: var(--radius); box-shadow: var(--shadow-md); }
.modal-header { border-bottom: 1px solid var(--border-color); padding: 16px 20px; }
.modal-footer { border-top: 1px solid var(--border-color); padding: 14px 20px; }
.modal-title { font-size: 15px; font-weight: 600; color: var(--text-primary); }

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .admin-sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition), width var(--transition);
    }

    .admin-sidebar.mobile-open {
        transform: translateX(0);
        width: var(--sidebar-width);
    }

    .admin-main {
        margin-left: 0;
        width: 100%;
    }

    .header-toggle-btn { display: flex; }

    .admin-footer { left: 0; }

    .admin-content { padding: 16px; }

    .page-header { flex-direction: column; align-items: flex-start; gap: 12px; }
}