:root {
  --admin-bg: #f3f6fb;
  --admin-surface: #ffffff;
  --admin-surface-soft: #f8fafc;
  --admin-border: rgba(15, 23, 42, 0.08);
  --admin-text: #0f172a;
  --admin-muted: #64748b;
  --admin-primary: #1d6655;
  --admin-primary-dark: #134c40;
  --admin-primary-soft: rgba(29, 102, 85, 0.12);
  --admin-sidebar-width: 280px;
  --admin-header-height: 76px;
  --admin-shadow: 0 18px 60px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html, body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  color: var(--admin-text);
  background:
    radial-gradient(circle at top left, rgba(29, 102, 85, 0.08), transparent 32%),
    linear-gradient(180deg, #f8fbfd 0%, var(--admin-bg) 100%);
}

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

.admin-sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--admin-sidebar-width);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.25rem;
  background: linear-gradient(180deg, #0f172a 0%, #111827 100%);
  color: #fff;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
  overflow: hidden;
  z-index: 1040;
}

.sidebar-scroll {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow-y: scroll;
  padding-right: 0.25rem;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.45) rgba(15, 23, 42, 0.9);
  scrollbar-gutter: stable both-edges;
}

.sidebar-scroll::-webkit-scrollbar {
  width: 11px;
}

.sidebar-scroll::-webkit-scrollbar-track {
  background: rgba(15, 23, 42, 0.9);
  border-radius: 999px;
}

.sidebar-scroll::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, rgba(74, 222, 128, 0.95), rgba(29, 102, 85, 0.92));
  border-radius: 999px;
  border: 2px solid rgba(15, 23, 42, 0.9);
  min-height: 42px;
}

.sidebar-scroll::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, rgba(134, 239, 172, 1), rgba(34, 197, 94, 0.95));
}

.sidebar-brand {
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  color: #fff;
  text-decoration: none;
}

.sidebar-brand-logo {
  display: block;
  width: auto;
  height: 54px;
  max-width: 100%;
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  background: linear-gradient(135deg, var(--admin-primary) 0%, #2f8a71 100%);
  box-shadow: 0 12px 24px rgba(29, 102, 85, 0.35);
}

.brand-mark-image {
  overflow: hidden;
  padding: 0;
  background: #fff;
}

.brand-mark-logo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-copy strong {
  font-size: 1rem;
  font-weight: 700;
}

.brand-copy small {
  color: rgba(255, 255, 255, 0.65);
  margin-top: 0.2rem;
}

.sidebar-profile {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.95rem 1rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 18px;
}

.sidebar-avatar {
  border-radius: 16px;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.sidebar-profile strong,
.sidebar-profile small {
  display: block;
}

.sidebar-profile strong {
  font-size: 0.95rem;
}

.sidebar-profile small {
  color: rgba(255, 255, 255, 0.65);
  margin-top: 0.15rem;
}

.sidebar-nav {
  flex: 1;
}

.sidebar-label {
  margin: 0 0 0.75rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
}

.sidebar-nav .nav {
  gap: 0.35rem;
}

.sidebar-nav .nav-link,
.sidebar-footer .nav-link {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  color: rgba(255, 255, 255, 0.78);
  border-radius: 14px;
  padding: 0.9rem 1rem;
  text-decoration: none;
  transition: all 0.2s ease;
}

.sidebar-nav .nav-link i,
.sidebar-footer .nav-link i {
  font-size: 1.05rem;
}

.sidebar-nav .nav-link:hover,
.sidebar-footer .nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.sidebar-nav .nav-link.active {
  color: #fff;
  background: linear-gradient(135deg, rgba(29, 102, 85, 0.95), rgba(47, 138, 113, 0.85));
  box-shadow: 0 12px 24px rgba(29, 102, 85, 0.22);
}

.nav-link-danger {
  color: #fecaca !important;
}

.sidebar-footer {
  padding-top: 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: grid;
  gap: 0.35rem;
}

.admin-main {
  flex: 1;
  margin-left: var(--admin-sidebar-width);
  min-width: 0;
}

.admin-header {
  position: sticky;
  top: 0;
  z-index: 1030;
  height: var(--admin-header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 1.5rem;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--admin-border);
}

.header-left,
.header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.admin-eyebrow {
  margin: 0;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--admin-muted);
}

.page-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.btn-toggle-sidebar {
  border: 1px solid var(--admin-border);
  background: var(--admin-surface);
  color: var(--admin-text);
  border-radius: 14px;
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
}

.btn-toggle-sidebar:hover {
  background: var(--admin-surface-soft);
}

.btn-user {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--admin-border);
  background: var(--admin-surface);
  border-radius: 999px;
  padding: 0.45rem 0.8rem 0.45rem 0.45rem;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.05);
}

.btn-user:hover {
  background: var(--admin-surface-soft);
}

.admin-content {
  padding: 1.5rem;
}

.admin-content > * {
  max-width: 100%;
}

.admin-footer {
  margin: 0 1.5rem 1.5rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--admin-border);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  color: var(--admin-muted);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.05);
}

.admin-footer-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.admin-footer-links a {
  color: var(--admin-primary);
  font-weight: 600;
}

.footer-separator {
  margin: 0 0.35rem;
}

.stat-card,
.card,
.login-card,
.admin-footer,
.sidebar-profile {
  box-shadow: var(--admin-shadow);
}

.stat-card {
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
  transform: translateY(-3px);
}

.card {
  border: 1px solid var(--admin-border) !important;
  border-radius: 20px !important;
  overflow: hidden;
}

.card-header {
  border-bottom: 1px solid var(--admin-border) !important;
}

.table {
  margin-bottom: 0;
}

.table th {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--admin-muted);
  border-bottom-color: var(--admin-border) !important;
}

.table td {
  vertical-align: middle;
}

.btn-primary {
  background-color: var(--admin-primary);
  border-color: var(--admin-primary);
}

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

.btn-outline-primary {
  color: var(--admin-primary);
  border-color: var(--admin-primary);
}

.btn-outline-primary:hover {
  background: var(--admin-primary);
  border-color: var(--admin-primary);
}

.bg-primary {
  background-color: var(--admin-primary) !important;
}

.bg-opacity-10 {
  background-color: var(--admin-primary-soft) !important;
}

#editorjs {
  min-height: 300px;
  border: 1px solid var(--admin-border);
  border-radius: 16px;
  padding: 1rem;
  background: #fff;
}

.codex-editor__redactor {
  min-height: 300px;
}

.admin-login {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at top left, rgba(29, 102, 85, 0.2), transparent 34%),
    radial-gradient(circle at bottom right, rgba(15, 23, 42, 0.3), transparent 30%),
    linear-gradient(135deg, #0f172a 0%, #134c40 100%);
  position: relative;
  overflow: hidden;
}

.admin-login::before,
.admin-login::after {
  content: '';
  position: absolute;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  filter: blur(2px);
}

.admin-login::before {
  width: 18rem;
  height: 18rem;
  top: -5rem;
  right: -4rem;
}

.admin-login::after {
  width: 12rem;
  height: 12rem;
  bottom: -3rem;
  left: -2rem;
}

.login-container {
  width: min(100%, 440px);
  padding: 1.25rem;
  position: relative;
  z-index: 1;
}

.login-card {
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 28px;
  padding: 2rem;
}

.login-header .brand {
  margin-bottom: 0.25rem;
  color: var(--admin-primary);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.admin-login-logo {
  display: block;
  width: min(280px, 90%);
  height: auto;
  margin: 0 auto;
}

.login-card .form-control {
  border-radius: 14px;
  min-height: 48px;
}

.login-card .btn-primary {
  min-height: 48px;
  border-radius: 14px;
}

.login-card a {
  color: var(--admin-primary);
  font-weight: 600;
}

.quiz-admin-page .card {
  border-radius: 18px !important;
}

.quiz-admin-page .quiz-question-editor textarea {
  resize: vertical;
}

.quiz-admin-page .quiz-question-editor .card-header {
  background: linear-gradient(135deg, rgba(29, 102, 85, 0.08), rgba(29, 102, 85, 0.02));
}

.quiz-admin-page .stat-card {
  border: 1px solid var(--admin-border);
}

.quiz-admin-page .table td,
.quiz-admin-page .table th {
  padding-top: 1rem;
  padding-bottom: 1rem;
}

@media (max-width: 992px) {
  .admin-sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s ease;
  }

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

  .admin-main {
    margin-left: 0;
  }

  .admin-header,
  .admin-content,
  .admin-footer {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .admin-footer {
    margin: 0 1rem 1rem;
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 576px) {
  .admin-content {
    padding-top: 1rem;
  }

  .page-title {
    font-size: 1rem;
  }

  .login-card {
    padding: 1.5rem;
    border-radius: 24px;
  }
}