/* ─── Management UI v2 — Professional dashboard design system ────────
 *
 * Inspired by Stripe / Notion / Linear admin patterns.
 * Single stylesheet cho cả /admin/ và /nihongo/giao-vien/.
 */

/* ═════ DESIGN TOKENS ═════ */
:root {
  /* Brand */
  --gk-brand: #DC2626;
  --gk-brand-hover: #B91C1C;
  --gk-brand-50: #FEF2F2;
  --gk-brand-100: #FEE2E2;
  --gk-brand-200: #FECACA;

  /* Neutrals (refined warm grays) */
  --gk-fg: #18181B;
  --gk-fg-muted: #52525B;
  --gk-fg-subtle: #A1A1AA;
  --gk-bg: #FAFAF9;
  --gk-bg-elevated: #FFFFFF;
  --gk-bg-subtle: #F4F4F5;
  --gk-border: #E4E4E7;
  --gk-border-strong: #D4D4D8;

  /* Semantic */
  --gk-success: #16A34A;
  --gk-success-bg: #F0FDF4;
  --gk-warning: #D97706;
  --gk-warning-bg: #FFFBEB;
  --gk-danger: #DC2626;
  --gk-danger-bg: #FEF2F2;
  --gk-info: #2563EB;
  --gk-info-bg: #EFF6FF;

  /* Roles */
  --gk-role-admin-from: #7C2D12;
  --gk-role-admin-to: #DC2626;
  --gk-role-teacher-from: #B45309;
  --gk-role-teacher-to: #F59E0B;
  --gk-role-student-from: #15803D;
  --gk-role-student-to: #22C55E;

  /* Shadows */
  --gk-sh-sm: 0 1px 2px rgba(24,24,27,.05);
  --gk-sh: 0 1px 3px rgba(24,24,27,.08), 0 1px 2px rgba(24,24,27,.04);
  --gk-sh-md: 0 4px 6px -1px rgba(24,24,27,.07), 0 2px 4px -1px rgba(24,24,27,.04);
  --gk-sh-lg: 0 10px 15px -3px rgba(24,24,27,.08), 0 4px 6px -2px rgba(24,24,27,.03);

  /* Radii */
  --gk-r-sm: 6px;
  --gk-r: 8px;
  --gk-r-md: 10px;
  --gk-r-lg: 12px;
  --gk-r-xl: 16px;

  /* Typography */
  --gk-fs-xs: 11px;
  --gk-fs-sm: 12.5px;
  --gk-fs-base: 13.5px;
  --gk-fs-md: 14px;
  --gk-fs-lg: 16px;
  --gk-fs-xl: 18px;
  --gk-fs-2xl: 22px;
  --gk-fs-3xl: 28px;
}

/* ═════ RESET / BASE ═════ */
body, .gk-mgmt-main {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif !important;
  color: var(--gk-fg);
  font-size: var(--gk-fs-md);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: var(--gk-bg) !important;
}

[lang="ja"], .gk-ja, .gk-ja-serif {
  font-family: 'Noto Sans JP', 'Plus Jakarta Sans', sans-serif !important;
}

code, pre, .gk-mono {
  font-family: 'JetBrains Mono', 'SF Mono', ui-monospace, monospace !important;
  font-variant-numeric: tabular-nums;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* ═════ ROLE BANNER ═════ */
.gk-role-banner {
  font-family: 'Plus Jakarta Sans', sans-serif !important;
  letter-spacing: 0.04em;
  border-bottom: 1px solid rgba(255,255,255,.15);
}

/* ═════ TOP NAV (app_nav.html) ═════ */
header[style*="height:72px"] {
  background: var(--gk-bg-elevated) !important;
  border-bottom: 1px solid var(--gk-border) !important;
  box-shadow: var(--gk-sh-sm);
}

/* ═════ SIDEBAR ═════ */
.gk-management-sidebar {
  width: 248px !important;
  flex-shrink: 0;
  background: var(--gk-bg-elevated) !important;
  border-right: 1px solid var(--gk-border);
  padding: 16px 12px !important;
  font-size: var(--gk-fs-base);
  position: sticky;
  top: 0;
  height: calc(100vh - 72px);
  overflow-y: auto;
}

.gk-management-sidebar::-webkit-scrollbar { width: 4px; }
.gk-management-sidebar::-webkit-scrollbar-thumb { background: var(--gk-border); border-radius: 2px; }

.gk-management-sidebar .gk-sidebar-search-input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--gk-border);
  border-radius: var(--gk-r);
  background: var(--gk-bg-subtle);
  font-size: var(--gk-fs-sm);
  color: var(--gk-fg);
  outline: none;
  transition: all .15s;
}
.gk-management-sidebar .gk-sidebar-search-input:focus {
  border-color: var(--gk-brand);
  background: var(--gk-bg-elevated);
  box-shadow: 0 0 0 3px var(--gk-brand-50);
}
.gk-management-sidebar .gk-sidebar-search-input::placeholder {
  color: var(--gk-fg-subtle);
}

.gk-sidebar-group {
  margin-bottom: 18px;
}

.gk-sidebar-group > div:first-child {
  font-size: var(--gk-fs-xs) !important;
  color: var(--gk-fg-subtle) !important;
  font-weight: 600 !important;
  letter-spacing: 0.08em !important;
  text-transform: uppercase;
  padding: 10px 12px 6px !important;
}

.gk-sidebar-item {
  display: flex !important;
  align-items: center;
  gap: 10px;
  padding: 8px 12px !important;
  text-decoration: none !important;
  color: var(--gk-fg-muted) !important;
  border-radius: var(--gk-r-sm) !important;
  font-size: var(--gk-fs-base) !important;
  font-weight: 500;
  transition: all .12s;
  margin-bottom: 1px;
}

.gk-sidebar-item:hover {
  background: var(--gk-bg-subtle) !important;
  color: var(--gk-fg) !important;
}

.gk-sidebar-item[style*="background:var(--primary-soft)"],
.gk-sidebar-item.active {
  background: var(--gk-brand-50) !important;
  color: var(--gk-brand) !important;
  font-weight: 600 !important;
}

/* ═════ MAIN CONTENT ═════ */
.gk-mgmt-wrapper {
  display: flex;
  min-height: calc(100vh - 72px);
  background: var(--gk-bg) !important;
}

.gk-mgmt-main {
  flex: 1;
  min-width: 0;
  padding: 32px 36px !important;
  background: var(--gk-bg) !important;
  max-width: 100%;
}

.gk-mgmt-main > div:first-child {
  margin-bottom: 8px;
}

/* ═════ TYPOGRAPHY ═════ */
.gk-eyebrow {
  font-size: var(--gk-fs-xs) !important;
  letter-spacing: 0.08em !important;
  text-transform: uppercase;
  color: var(--gk-fg-subtle) !important;
  font-weight: 600;
  margin-bottom: 4px;
}

.gk-h1 {
  font-size: var(--gk-fs-3xl) !important;
  font-weight: 700 !important;
  line-height: 1.25;
  color: var(--gk-fg);
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.gk-h3 {
  font-size: var(--gk-fs-xl) !important;
  font-weight: 600;
  color: var(--gk-fg);
  letter-spacing: -0.005em;
}

.gk-body {
  color: var(--gk-fg-muted);
  font-size: var(--gk-fs-md);
  line-height: 1.6;
}

/* Breadcrumbs */
.gk-mgmt-main > div:has(a[href*="teacher_dashboard"]) {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--gk-fs-sm) !important;
  color: var(--gk-fg-subtle) !important;
  margin-bottom: 16px !important;
}

.gk-mgmt-main > div:has(a[href*="teacher_dashboard"]) a {
  color: var(--gk-fg-muted) !important;
  text-decoration: none !important;
  transition: color .12s;
}

.gk-mgmt-main > div:has(a[href*="teacher_dashboard"]) a:hover {
  color: var(--gk-brand) !important;
}

/* ═════ CARDS ═════ */
.gk-card {
  background: var(--gk-bg-elevated);
  border: 1px solid var(--gk-border);
  border-radius: var(--gk-r-lg) !important;
  box-shadow: var(--gk-sh-sm);
  transition: box-shadow .15s, border-color .15s;
}

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

/* ═════ BUTTONS ═════ */
.gk-btn {
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--gk-r-sm);
  font-size: var(--gk-fs-md);
  font-weight: 500;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .15s;
  white-space: nowrap;
  user-select: none;
  line-height: 1.2;
}

.gk-btn-sm {
  padding: 6px 11px;
  font-size: var(--gk-fs-sm);
}

.gk-btn-primary {
  background: var(--gk-brand) !important;
  color: white !important;
  border-color: var(--gk-brand) !important;
  box-shadow: var(--gk-sh-sm);
}
.gk-btn-primary:hover {
  background: var(--gk-brand-hover) !important;
  border-color: var(--gk-brand-hover) !important;
  box-shadow: var(--gk-sh);
}

.gk-btn-ghost {
  background: var(--gk-bg-elevated) !important;
  color: var(--gk-fg) !important;
  border: 1px solid var(--gk-border) !important;
}
.gk-btn-ghost:hover {
  background: var(--gk-bg-subtle) !important;
  border-color: var(--gk-border-strong) !important;
}

/* ═════ FORMS ═════ */
.gk-mgmt-main form {
  font-size: var(--gk-fs-md);
}

.gk-mgmt-main form input[type="text"],
.gk-mgmt-main form input[type="email"],
.gk-mgmt-main form input[type="password"],
.gk-mgmt-main form input[type="number"],
.gk-mgmt-main form input[type="url"],
.gk-mgmt-main form input[type="date"],
.gk-mgmt-main form input[type="datetime-local"],
.gk-mgmt-main form input[type="search"],
.gk-mgmt-main form input[type="tel"],
.gk-mgmt-main form input[type="file"],
.gk-mgmt-main form select,
.gk-mgmt-main form textarea {
  width: 100% !important;
  padding: 9px 12px !important;
  border: 1px solid var(--gk-border) !important;
  border-radius: var(--gk-r) !important;
  font-size: var(--gk-fs-md) !important;
  background: var(--gk-bg-elevated) !important;
  color: var(--gk-fg) !important;
  outline: none !important;
  transition: border-color .15s, box-shadow .15s !important;
  font-family: inherit !important;
  line-height: 1.4;
}

.gk-mgmt-main form input::placeholder,
.gk-mgmt-main form textarea::placeholder {
  color: var(--gk-fg-subtle);
}

.gk-mgmt-main form input:focus,
.gk-mgmt-main form select:focus,
.gk-mgmt-main form textarea:focus {
  border-color: var(--gk-brand) !important;
  box-shadow: 0 0 0 3px var(--gk-brand-50) !important;
}

.gk-mgmt-main form input:disabled,
.gk-mgmt-main form input[readonly] {
  background: var(--gk-bg-subtle) !important;
  color: var(--gk-fg-muted) !important;
  cursor: not-allowed;
}

.gk-mgmt-main form textarea {
  resize: vertical;
  min-height: 96px;
  line-height: 1.5;
}

.gk-mgmt-main form input[type="checkbox"],
.gk-mgmt-main form input[type="radio"] {
  width: 16px !important;
  height: 16px !important;
  margin: 0;
  accent-color: var(--gk-brand);
  cursor: pointer;
}

.gk-mgmt-main form label {
  display: block;
  font-weight: 500;
  font-size: var(--gk-fs-md);
  color: var(--gk-fg);
  margin-bottom: 6px;
  line-height: 1.4;
}

.gk-mgmt-main form small,
.gk-mgmt-main form .helptext {
  display: block;
  font-size: var(--gk-fs-sm);
  color: var(--gk-fg-muted);
  margin-top: 5px;
  line-height: 1.45;
}

.gk-mgmt-main form .field-error,
.gk-mgmt-main form ul.errorlist li {
  color: var(--gk-danger);
  font-size: var(--gk-fs-sm);
  margin-top: 5px;
}

/* ═════ TABLES ═════ */
.gk-card table,
#result_list {
  width: 100%;
  border-collapse: separate !important;
  border-spacing: 0;
  background: var(--gk-bg-elevated);
  font-size: var(--gk-fs-base);
}

.gk-card table thead th,
#result_list thead th {
  background: var(--gk-bg-subtle) !important;
  color: var(--gk-fg-muted) !important;
  font-size: var(--gk-fs-xs) !important;
  font-weight: 600 !important;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 11px 14px !important;
  text-align: left;
  border-bottom: 1px solid var(--gk-border) !important;
}

.gk-card table tbody td,
#result_list tbody td {
  padding: 13px 14px !important;
  border-bottom: 1px solid var(--gk-border) !important;
  font-size: var(--gk-fs-base);
  color: var(--gk-fg);
  vertical-align: middle;
}

.gk-card table tbody tr,
#result_list tbody tr {
  transition: background .12s;
}

.gk-card table tbody tr:hover,
#result_list tbody tr:hover {
  background: var(--gk-bg-subtle);
}

.gk-card table tbody tr:last-child td {
  border-bottom: none !important;
}

/* ═════ STATUS PILLS ═════ */
.gk-mgmt-main span[style*="border-radius:99px"] {
  border-radius: 99px !important;
  font-size: var(--gk-fs-xs) !important;
  font-weight: 600 !important;
  padding: 3px 10px !important;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ═════ MESSAGES ═════ */
.gk-mgmt-main ul.messagelist,
.gk-mgmt-main .messagelist {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
}

.gk-mgmt-main ul.messagelist li,
.gk-mgmt-main .messagelist li,
.gk-mgmt-main .messagelist .success,
.gk-mgmt-main .messagelist .error {
  padding: 12px 16px;
  border-radius: var(--gk-r-md);
  margin-bottom: 8px;
  font-size: var(--gk-fs-md);
  border-left: 3px solid;
}

.gk-mgmt-main .success {
  background: var(--gk-success-bg) !important;
  color: #14532D !important;
  border-color: var(--gk-success) !important;
}

.gk-mgmt-main .error, .gk-mgmt-main .warning, .gk-mgmt-main .errornote {
  background: var(--gk-danger-bg) !important;
  color: #7F1D1D !important;
  border-color: var(--gk-danger) !important;
}

/* ═════ TABLET PORTRAIT (≤ 900px) + MOBILE ═════
   Sidebar 248px sticky chiếm quá nhiều không gian khi viewport ≤ 900px →
   collapse thành thanh ngang. Tablet landscape (≥ 901px) vẫn dùng side-by-side. */
@media (max-width: 900px) {
  .gk-mgmt-wrapper,
  .gk-admin-wrapper { flex-direction: column; }
  .gk-management-sidebar {
    width: 100% !important;
    height: auto !important;
    max-height: 60vh;
    border-right: none !important;
    border-bottom: 1px solid var(--gk-border);
    padding: 12px !important;
    position: relative;
    top: 0;
  }
  .gk-mgmt-main { padding: 20px !important; }
}

/* ═════ TABLET PORTRAIT + MOBILE (≤ 900px) — sidebar collapsible drawer ═════
   Toggle bằng nút ☰ Menu (xem partials/management_sidebar.html). Collapsible
   wrapper có `data-collapsible`; nếu thiếu attribute thì menu luôn mở. */
@media (max-width: 900px) {
  /* Collapsible: chỉ hiển thị header (logo + toggle), giấu menu items */
  .gk-management-sidebar[data-collapsible] .gk-sidebar-body { display: none; }
  .gk-management-sidebar[data-collapsible].is-open .gk-sidebar-body { display: block; }
  .gk-management-sidebar[data-collapsible] .gk-sidebar-toggle {
    display: inline-flex !important;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border: 1px solid var(--gk-border);
    border-radius: var(--gk-r);
    background: var(--gk-bg-elevated);
    font-size: var(--gk-fs-sm);
    font-weight: 600;
    cursor: pointer;
    margin-left: auto;
  }
}

/* ═════ MOBILE (≤ 640px) — polish chỉ áp cho phone ═════ */
@media (max-width: 640px) {
  .gk-mgmt-main { padding: 14px !important; }

  .gk-management-sidebar {
    padding: 10px !important;
    max-height: none;
  }

  /* Form rows → stack */
  .gk-mgmt-main .form-row,
  .gk-mgmt-main fieldset.module { padding: 8px 12px !important; }

  /* Filter sidebar (admin changelist) — đẩy xuống dưới content */
  .gk-admin-main #changelist-filter,
  .gk-mgmt-main #changelist-filter {
    width: 100% !important;
    margin-top: 16px;
    position: static !important;
  }
}

/* Toggle button luôn ẩn ở desktop/tablet không-mobile */
.gk-sidebar-toggle { display: none; }

/* ═════ UNFOLD ADMIN OVERRIDES ═════ */
.gk-admin-main {
  background: var(--gk-bg) !important;
}

/* Force admin content area to use our design tokens */
.gk-admin-main .bg-white,
.gk-admin-main fieldset.module,
.gk-admin-main form > div {
  background: var(--gk-bg-elevated) !important;
  border: 1px solid var(--gk-border);
  border-radius: var(--gk-r-lg);
}

.gk-admin-main fieldset.module {
  margin-bottom: 16px;
}

.gk-admin-main fieldset.module h2 {
  background: var(--gk-bg-subtle) !important;
  border-bottom: 1px solid var(--gk-border);
  border-radius: var(--gk-r-lg) var(--gk-r-lg) 0 0;
  padding: 11px 16px !important;
  font-size: var(--gk-fs-xs) !important;
  font-weight: 700 !important;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gk-fg-muted) !important;
}

/* Object tools (top-right buttons) */
.gk-admin-main ul.object-tools {
  display: flex;
  gap: 8px;
  padding: 0;
  list-style: none;
  margin: 0 0 16px;
}

.gk-admin-main ul.object-tools li a {
  background: var(--gk-brand) !important;
  color: white !important;
  border-radius: var(--gk-r) !important;
  padding: 7px 14px !important;
  text-decoration: none !important;
  font-weight: 500 !important;
  font-size: var(--gk-fs-sm) !important;
  border: 1px solid var(--gk-brand) !important;
  box-shadow: var(--gk-sh-sm);
  transition: all .15s;
}
.gk-admin-main ul.object-tools li a:hover {
  background: var(--gk-brand-hover) !important;
  border-color: var(--gk-brand-hover) !important;
}

/* Admin form rows */
.gk-admin-main .form-row {
  border: none !important;
  padding: 8px 16px !important;
}

/* Filter sidebar in changelist */
.gk-admin-main #changelist-filter {
  background: var(--gk-bg-elevated) !important;
  border-radius: var(--gk-r-lg);
  border: 1px solid var(--gk-border);
}

.gk-admin-main #changelist-filter h2 {
  background: var(--gk-bg-subtle) !important;
  color: var(--gk-fg-muted) !important;
  font-size: var(--gk-fs-xs) !important;
  font-weight: 700;
  text-transform: uppercase;
  padding: 10px 14px !important;
  border-radius: var(--gk-r-lg) var(--gk-r-lg) 0 0;
}

/* Submit row */
.gk-admin-main .submit-row {
  display: flex;
  gap: 8px;
  padding: 16px;
  background: var(--gk-bg-subtle) !important;
  border-radius: var(--gk-r-lg);
  border: 1px solid var(--gk-border);
}

.gk-admin-main .submit-row input[type="submit"] {
  padding: 8px 16px !important;
  border-radius: var(--gk-r) !important;
  border: 1px solid var(--gk-brand) !important;
  background: var(--gk-brand) !important;
  color: white !important;
  font-weight: 500 !important;
  cursor: pointer;
  font-size: var(--gk-fs-md) !important;
}

.gk-admin-main .submit-row input[type="submit"]:hover {
  background: var(--gk-brand-hover) !important;
}

/* Empty states */
.gk-mgmt-main > div[style*="dashed var(--rule)"] {
  border-color: var(--gk-border) !important;
  background: var(--gk-bg-elevated) !important;
  border-radius: var(--gk-r-lg) !important;
}

/* ═════════════════════════════════════════════════════════════════════
   PHASE 0 — DUAL BRAND SUPPORT
   Mặc định: tông đỏ son Nihongo. Khi <body data-brand="ginou"> (set bởi
   TeacherContextMixin/template khi đang ở classroom Tokutei), CSS variables
   tự switch sang chàm Gino. Một file, two themes.
   ═════════════════════════════════════════════════════════════════════ */

:root {
  /* Nihongo (đỏ son 朱色) — default — align với student site #E23D28 */
  --gk-brand: #E23D28;
  --gk-brand-hover: #C0301F;
  --gk-brand-50:  #FEF2F0;
  --gk-brand-100: #FDE2DE;
  --gk-brand-200: #FAC4BC;
  --gk-brand-300: #F3998D;
  --gk-brand-ink: #5E1A11;
}

body[data-brand="ginou"] {
  /* Ginō (chàm 藍色) — Tokutei */
  --gk-brand: #2D4A7C;
  --gk-brand-hover: #233A62;
  --gk-brand-50:  #EEF2F7;
  --gk-brand-100: #DAE2EE;
  --gk-brand-200: #B0C0DA;
  --gk-brand-300: #7B92BB;
  --gk-brand-ink: #14223B;
}

/* Brand chip — hiện ở topbar khi navigate vào model brand khác default */
.gk-brand-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--gk-brand-50);
  color: var(--gk-brand);
  border: 1px solid var(--gk-brand-200);
  border-radius: 99px;
  font-size: var(--gk-fs-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.gk-brand-chip--ginou {
  background: #EEF2F7;
  color: #2D4A7C;
  border-color: #B0C0DA;
}
.gk-brand-chip--nihongo {
  background: #FEF2F0;
  color: #E23D28;
  border-color: #FAC4BC;
}

/* ═════════════════════════════════════════════════════════════════════
   PHASE 0 — COMPONENT UTILITIES
   Class-based components, không depend inline style. Dùng trong
   templates/management/components/.
   ═════════════════════════════════════════════════════════════════════ */

/* — Stat tile (compact dashboard metric) — */
.gk-stat {
  background: var(--gk-bg-elevated);
  border: 1px solid var(--gk-border);
  border-radius: var(--gk-r-lg);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color .15s, box-shadow .15s;
}
.gk-stat:hover { border-color: var(--gk-border-strong); }
.gk-stat__label {
  font-size: var(--gk-fs-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--gk-fg-subtle);
}
.gk-stat__value {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--gk-fg);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.gk-stat__delta {
  font-size: var(--gk-fs-sm);
  color: var(--gk-fg-muted);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.gk-stat__delta--up    { color: var(--gk-success); }
.gk-stat__delta--down  { color: var(--gk-danger); }
.gk-stat--brand .gk-stat__value { color: var(--gk-brand); }

/* — Filter bar (sticky top of list pages) — */
.gk-filter-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: var(--gk-bg-elevated);
  border: 1px solid var(--gk-border);
  border-radius: var(--gk-r-lg);
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.gk-filter-bar__search {
  flex: 1;
  min-width: 220px;
  padding: 7px 11px;
  border: 1px solid var(--gk-border);
  border-radius: var(--gk-r);
  background: var(--gk-bg-subtle);
  font-size: var(--gk-fs-sm);
}
.gk-filter-bar__search:focus {
  background: var(--gk-bg-elevated);
  border-color: var(--gk-brand);
  outline: none;
  box-shadow: 0 0 0 3px var(--gk-brand-50);
}
.gk-filter-chip {
  padding: 5px 11px;
  border: 1px solid var(--gk-border);
  border-radius: 99px;
  font-size: var(--gk-fs-sm);
  background: var(--gk-bg-elevated);
  color: var(--gk-fg-muted);
  cursor: pointer;
  text-decoration: none;
  transition: all .12s;
}
.gk-filter-chip:hover { border-color: var(--gk-border-strong); }
.gk-filter-chip.is-active {
  background: var(--gk-brand);
  color: #fff;
  border-color: var(--gk-brand);
}

/* — Data table (Linear/Stripe density) — */
.gk-table-wrap {
  background: var(--gk-bg-elevated);
  border: 1px solid var(--gk-border);
  border-radius: var(--gk-r-lg);
  overflow: hidden;
}
.gk-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: var(--gk-fs-base);
}
.gk-table thead th {
  background: var(--gk-bg-subtle);
  color: var(--gk-fg-muted);
  font-size: var(--gk-fs-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--gk-border);
  user-select: none;
}
.gk-table tbody td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--gk-border);
  vertical-align: middle;
}
.gk-table tbody tr:last-child td { border-bottom: none; }
.gk-table tbody tr { transition: background .1s; }
.gk-table tbody tr:hover { background: var(--gk-bg-subtle); }
.gk-table__avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--gk-bg-subtle);
  display: inline-grid;
  place-items: center;
  font-size: var(--gk-fs-sm);
  font-weight: 700;
  color: var(--gk-fg-muted);
  margin-right: 10px;
  vertical-align: middle;
}
.gk-table__cell-secondary {
  font-size: var(--gk-fs-xs);
  color: var(--gk-fg-subtle);
}

/* — Empty state (no data) — */
.gk-empty {
  text-align: center;
  padding: 56px 28px;
  background: var(--gk-bg-elevated);
  border: 2px dashed var(--gk-border);
  border-radius: var(--gk-r-lg);
}
.gk-empty__mascot {
  width: 140px;
  height: 140px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: var(--gk-brand-50);
  overflow: hidden;
  display: grid;
  place-items: center;
  border: 3px solid var(--gk-brand-100);
}
.gk-empty__mascot img {
  width: 180px;
  height: auto;
  margin-top: 18px;
}
.gk-empty__title {
  font-size: var(--gk-fs-xl);
  font-weight: 700;
  color: var(--gk-fg);
  margin-bottom: 6px;
}
.gk-empty__sub {
  font-size: var(--gk-fs-md);
  color: var(--gk-fg-muted);
  max-width: 420px;
  margin: 0 auto 18px;
  line-height: 1.55;
}

/* — Mascot strip (greeting on dashboard) — */
.gk-mascot-strip {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 18px 24px;
  background: linear-gradient(135deg, var(--gk-brand-50) 0%, var(--gk-bg-elevated) 70%);
  border: 1px solid var(--gk-brand-100);
  border-radius: var(--gk-r-lg);
  margin-bottom: 22px;
}
.gk-mascot-strip__avatar {
  width: 84px; height: 84px;
  border-radius: 50%;
  background: #fff;
  border: 2.5px solid var(--gk-brand);
  overflow: hidden;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  box-shadow: 0 4px 12px rgba(0,0,0,.08);
}
.gk-mascot-strip__avatar img {
  width: 120px; height: auto; margin-top: 14px;
}
.gk-mascot-strip__title {
  font-size: var(--gk-fs-lg);
  font-weight: 700;
  color: var(--gk-fg);
  margin-bottom: 2px;
}
.gk-mascot-strip__sub {
  font-size: var(--gk-fs-sm);
  color: var(--gk-fg-muted);
  line-height: 1.5;
}

/* — Toast (notifications) — */
.gk-toast-stack {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 9999;
  pointer-events: none;
}
.gk-toast {
  background: var(--gk-bg-elevated);
  border: 1px solid var(--gk-border);
  border-left: 3px solid var(--gk-brand);
  border-radius: var(--gk-r);
  padding: 12px 16px;
  box-shadow: var(--gk-sh-lg);
  font-size: var(--gk-fs-sm);
  max-width: 360px;
  pointer-events: auto;
  animation: gk-toast-slide-in .25s ease-out;
}
.gk-toast--success { border-left-color: var(--gk-success); }
.gk-toast--danger  { border-left-color: var(--gk-danger); }
.gk-toast--warning { border-left-color: var(--gk-warning); }
@keyframes gk-toast-slide-in {
  from { opacity: 0; transform: translateX(10px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* — Topbar action button (switch workspace) — */
.gk-switch-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--gk-bg-subtle);
  color: var(--gk-fg-muted);
  border: 1px solid var(--gk-border);
  border-radius: var(--gk-r);
  font-size: var(--gk-fs-sm);
  font-weight: 500;
  text-decoration: none;
  transition: all .12s;
}
.gk-switch-btn:hover {
  background: var(--gk-brand-50);
  color: var(--gk-brand);
  border-color: var(--gk-brand-200);
}

/* — Mobile/tablet polish (sidebar drawer trong block @900 phía trên) — */
@media (max-width: 1023px) {
  .gk-mgmt-main { padding: 20px 16px !important; }
}
@media (max-width: 767px) {
  .gk-stat { padding: 14px 16px; }
  .gk-stat__value { font-size: 22px; }
  .gk-mascot-strip { flex-direction: column; text-align: center; }
  .gk-table-wrap { overflow-x: auto; }
}

/* ═════════════════════════════════════════════════════════════════════
   PHASE 4 — POLISH: animations / loading skeletons / print rules
   ═════════════════════════════════════════════════════════════════════ */

/* — Page enter animation (subtle fade-up) — */
.gk-mgmt-main {
  animation: gk-page-enter .25s ease-out;
}
@keyframes gk-page-enter {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* — Hover lift cho cards có cursor pointer — */
.gk-card[onclick], a.gk-card, .gk-card[href] {
  cursor: pointer;
  transition: transform .12s, box-shadow .12s, border-color .12s;
}
.gk-card[onclick]:hover, a.gk-card:hover, .gk-card[href]:hover {
  transform: translateY(-2px);
  box-shadow: var(--gk-sh-md);
  border-color: var(--gk-brand-200);
}

/* — Button micro-interaction — */
.gk-btn {
  transform-origin: center;
}
.gk-btn:active {
  transform: scale(.97);
}

/* — Form field invalid shake — */
@keyframes gk-shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-4px); }
  40%, 80% { transform: translateX(4px); }
}
.gk-mgmt-main form input:invalid:not(:placeholder-shown),
.gk-mgmt-main form input.is-invalid {
  border-color: var(--gk-danger);
}
.gk-shake { animation: gk-shake .35s ease-in-out; }

/* — Loading skeleton — */
.gk-skeleton {
  background: linear-gradient(90deg,
    var(--gk-bg-subtle) 0%,
    var(--gk-border) 50%,
    var(--gk-bg-subtle) 100%);
  background-size: 200% 100%;
  animation: gk-skeleton-pulse 1.4s ease-in-out infinite;
  border-radius: var(--gk-r);
  display: block;
}
@keyframes gk-skeleton-pulse {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.gk-skeleton--text { height: 14px; margin-bottom: 8px; }
.gk-skeleton--title { height: 24px; margin-bottom: 12px; width: 60%; }
.gk-skeleton--avatar { width: 32px; height: 32px; border-radius: 50%; }
.gk-skeleton--card { height: 80px; margin-bottom: 8px; }

/* — Save success toast w/ Gou-kun mini — */
.gk-toast--with-mascot {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-right: 16px;
}
.gk-toast--with-mascot::before {
  content: "";
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--gk-brand-50) center/120% no-repeat;
  background-image: url("/static/img/mascot/gou-kun-thumbs.jpg");
  background-position: center 6px;
  border: 1.5px solid var(--gk-brand);
  flex-shrink: 0;
}

/* — Mobile responsive — comprehensive — */
@media (max-width: 1023px) {
  /* Sidebar collapses to top bar (existing rule) */
  /* Main padding tighter (existing rule) */
  .gk-stat { padding: 14px 16px; }
  .gk-mgmt-main > div[style*="grid-template-columns:2fr 1fr"],
  .gk-mgmt-main > div[style*="grid-template-columns:1fr 1fr"],
  .gk-mgmt-main > div[style*="grid-template-columns:repeat(5"],
  .gk-mgmt-main > div[style*="grid-template-columns:repeat(4"] {
    grid-template-columns: 1fr 1fr !important;
  }
  .gk-mgmt-main > div[style*="grid-template-columns:repeat(3"] {
    grid-template-columns: 1fr 1fr !important;
  }
}
@media (max-width: 640px) {
  .gk-mgmt-main { padding: 14px 12px !important; }
  .gk-h1 { font-size: 22px !important; }
  .gk-mgmt-main > div[style*="grid-template-columns"] {
    grid-template-columns: 1fr !important;
  }
  .gk-mascot-strip {
    padding: 14px 16px;
  }
  .gk-mascot-strip__avatar { width: 64px; height: 64px; }
  .gk-mascot-strip__avatar img { width: 88px; margin-top: 10px; }
  .gk-filter-bar {
    flex-direction: column;
    align-items: stretch;
  }
  .gk-filter-bar__search { min-width: auto; }
  .gk-table { font-size: 12.5px; }
  .gk-table thead th, .gk-table tbody td { padding: 8px 10px; }
}

/* — Print friendly — */
@media print {
  .gk-management-sidebar,
  .gk-mascot-strip,
  header[style*="height:64px"],
  .gk-role-banner,
  .gk-toast-stack,
  .gk-btn,
  .gk-filter-bar,
  [class*="gk-switch"] {
    display: none !important;
  }
  body, .gk-mgmt-main {
    background: white !important;
    color: black !important;
  }
  .gk-card {
    border: 1px solid #ccc !important;
    box-shadow: none !important;
    page-break-inside: avoid;
  }
  .gk-table {
    border-collapse: collapse;
  }
  .gk-table th, .gk-table td {
    border: 1px solid #ccc !important;
  }
  a {
    text-decoration: none !important;
    color: black !important;
  }
}

/* — Focus visible (keyboard accessibility) — */
.gk-mgmt-main *:focus-visible {
  outline: 2px solid var(--gk-brand);
  outline-offset: 2px;
  border-radius: var(--gk-r-sm);
}

/* — Scroll behavior — */
html { scroll-behavior: smooth; }

/* ═════════════════════════════════════════════════════════════════════
   FIX — User dropdown trong app_nav (góc top-right) bị che bởi unfold
   stacking context. Override z-index để dropdown float trên mọi content.
   ═════════════════════════════════════════════════════════════════════ */

/* Cho phép dropdown <details> overflow ra ngoài header */
.gk-top-nav {
  z-index: 100 !important;
  overflow: visible !important;
}

/* User dropdown panel — đảm bảo float trên unfold content + sidebar */
.gk-top-nav details[open] > div,
.gk-top-nav details[open] > details {
  z-index: 1000 !important;
  box-shadow: 0 10px 25px rgba(0,0,0,.12), 0 4px 10px rgba(0,0,0,.06) !important;
}

/* Hover state cho item dropdown */
.gk-top-nav details > div > a,
.gk-top-nav details > div > form button {
  transition: background .12s, color .12s;
}
.gk-top-nav details > div > a:hover {
  background: var(--gk-bg-subtle) !important;
  color: var(--gk-brand) !important;
}
.gk-top-nav details > div > form button:hover {
  background: #FEF2F2 !important;
}

/* Đảm bảo dropdown không bị wrap text */
.gk-top-nav details > div {
  white-space: nowrap;
}

/* Smooth open animation */
.gk-top-nav details[open] > div {
  animation: gk-dropdown-fade .15s ease-out;
}
@keyframes gk-dropdown-fade {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Avatar/badge inside summary */
.gk-top-nav details > summary {
  list-style: none;
}
.gk-top-nav details > summary::-webkit-details-marker {
  display: none;
}

/* Fix overlap với role_banner + admin_switcher khi mở dropdown */
.gk-role-banner,
.gk-admin-wrapper {
  position: relative;
  z-index: 1;
}

/* ═════ RESPONSIVE ADMIN — /admin/ index + analytics dashboard ═════
   admin/index.html + admin/analytics/dashboard.html dùng inline `<style>` +
   inline `grid-template-columns:repeat(4, 1fr)` cho stat tile / quick actions.
   Wrapper là `#content` (Unfold), không phải `.gk-mgmt-main`.

   Bonus: responsive.css (frontend) không load trong admin → body cần
   overflow-x:hidden để chặn cuộn ngang khi dropdown/sidebar tràn. */

body.gk-admin-body,
.gk-admin-wrapper { max-width: 100%; }
.gk-admin-wrapper { overflow-x: clip; }
html:has(.gk-admin-wrapper),
html:has(.gk-admin-wrapper) body { overflow-x: hidden; max-width: 100%; }

@media (max-width: 1024px) {
  .gk-admin-wrapper #content [style*="grid-template-columns:repeat(5, 1fr)"],
  .gk-admin-wrapper #content [style*="grid-template-columns:repeat(4, 1fr)"],
  .gk-admin-wrapper .stat-grid {
    grid-template-columns: repeat(2, 1fr) !important;
  }
  .gk-admin-wrapper #content [style*="grid-template-columns:2fr 1fr"],
  .gk-admin-wrapper #content [style*="grid-template-columns:1fr 2fr"] {
    grid-template-columns: 1fr !important;
  }
  .gk-admin-wrapper .stat-grid[style*="grid-template-columns:repeat(3, 1fr)"] {
    grid-template-columns: repeat(2, 1fr) !important;
  }
}

@media (max-width: 640px) {
  .gk-admin-wrapper #content [style*="grid-template-columns:repeat(5, 1fr)"],
  .gk-admin-wrapper #content [style*="grid-template-columns:repeat(4, 1fr)"],
  .gk-admin-wrapper #content [style*="grid-template-columns:repeat(3, 1fr)"],
  .gk-admin-wrapper #content [style*="grid-template-columns:1fr 1fr"],
  .gk-admin-wrapper .stat-grid,
  .gk-admin-wrapper .stat-grid[style*="grid-template-columns:repeat(3, 1fr)"],
  .gk-admin-wrapper .stat-grid[style*="grid-template-columns:repeat(2, 1fr)"] {
    grid-template-columns: 1fr !important;
  }
  .gk-admin-wrapper #content [style*="grid-template-columns:2fr 1fr"],
  .gk-admin-wrapper #content [style*="grid-template-columns:1fr 2fr"] {
    grid-template-columns: 1fr !important;
  }
  .gk-admin-wrapper #content [style*="padding:24px 32px"],
  .gk-admin-wrapper #content [style*="padding:28px 32px"] {
    padding: 16px 14px !important;
  }
  /* Greeting hero — wrap avatar + text + ẩn mascot oversize */
  .gk-admin-wrapper #content [style*="display:flex"][style*="align-items:center"][style*="gap:24px"] {
    flex-wrap: wrap !important;
    gap: 14px !important;
  }
  .gk-admin-wrapper #content [style*="margin:-20px -24px"] { margin: 0 !important; }
  /* Tables (admin changelist + analytics metric) */
  .gk-admin-wrapper #content table,
  .gk-admin-wrapper #content table.metric,
  .gk-admin-wrapper #content table#result_list {
    display: block !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch;
    max-width: 100% !important;
  }
  .gk-admin-wrapper .filter-bar { flex-wrap: wrap !important; }
  .gk-admin-wrapper .pass-bar { width: 60px !important; }
  /* Mascot avatar 96px → 64px */
  .gk-admin-wrapper #content [style*="width:96px"][style*="height:96px"] {
    width: 64px !important; height: 64px !important;
  }
  .gk-admin-wrapper #content img[style*="width:140px"] { width: 92px !important; }
}