:root {
  --green-900: #0f2f22;
  --green-800: #13402d;
  --green-700: #1a563a;
  --green-600: #2b7a52;
  --green-500: #3a9a67;
  --mint-200: #ccefe0;
  --mint-100: #e9f8f2;
  --cloud: #f7fbf9;
  --ink: #122019;
  --card: #ffffff;
  --shadow: 0 16px 40px rgba(18, 32, 25, 0.12);
}

html, body {
  height: 100%;
}

body {
  font-family: "Manrope", sans-serif;
  background: radial-gradient(1200px 600px at 10% 0%, #e9f7f1 0%, #f7fbf9 40%, #f2f8f6 100%);
  color: var(--ink);
}

.bg-gradient-primary {
  background: linear-gradient(160deg, var(--green-800) 0%, var(--green-600) 100%) !important;
}

.sidebar .sidebar-brand {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  margin: 14px 16px;
  padding: 14px;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.12);
}

.sidebar .sidebar-brand-text {
  font-weight: 700;
  letter-spacing: 0.3px;
}

.sidebar .nav-item .nav-link {
  border-radius: 12px;
  margin: 6px 10px;
  transition: background 160ms ease, transform 160ms ease;
}

.sidebar .nav-item .nav-link:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateX(3px);
}

.sidebar .nav-item.active .nav-link {
  background: rgba(255, 255, 255, 0.18);
}

.topbar {
  background: transparent;
}

.topbar .navbar {
  background: transparent;
}

.card {
  border: 1px solid rgba(18, 32, 25, 0.08);
  border-radius: 18px;
  box-shadow: var(--shadow);
  overflow: hidden;
  animation: fadeUp 420ms ease both;
}

.card-header {
  background: var(--mint-100);
  border-bottom: 1px solid rgba(18, 32, 25, 0.08);
}

.card-body {
  background: var(--card);
}

.quiz-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.quiz-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px;
  border-radius: 16px;
  background: linear-gradient(160deg, #ffffff 0%, #f4fbf7 100%);
  border: 1px solid rgba(18, 32, 25, 0.08);
  text-decoration: none;
  color: inherit;
  box-shadow: 0 10px 24px rgba(18, 32, 25, 0.08);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.quiz-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px rgba(18, 32, 25, 0.14);
  color: inherit;
}

.quiz-card__title {
  font-weight: 700;
  font-size: 1rem;
}

.quiz-card__desc {
  font-size: 0.9rem;
  color: #4a6154;
}

.quiz-card__cta {
  margin-top: auto;
  font-weight: 600;
  color: var(--green-700);
}

.quiz-card__meta {
  font-size: 0.85rem;
  color: #5b6f64;
}

.quiz-timer {
  font-size: 0.95rem;
  letter-spacing: 0.2px;
  padding: 0.6rem 0.9rem;
  border-radius: 999px;
  box-shadow: 0 10px 22px rgba(43, 122, 82, 0.22);
}

.editor-toolbar .btn {
  border-radius: 10px;
}

.editor-surface {
  display: block;
  min-height: 220px;
  border: 1px solid rgba(18, 32, 25, 0.15);
  border-radius: 12px;
  padding: 12px;
  background: #fff;
  box-shadow: inset 0 1px 2px rgba(18, 32, 25, 0.08);
  white-space: pre-wrap;
}

.editor-surface:focus {
  outline: none;
  border-color: var(--green-600);
  box-shadow: 0 0 0 0.2rem rgba(58, 154, 103, 0.2);
}

.history-table {
  border-collapse: separate;
  border-spacing: 0 10px;
}

.history-table thead th {
  border-bottom: none;
}

.history-table tbody tr {
  background: var(--card);
  box-shadow: 0 10px 22px rgba(18, 32, 25, 0.08);
}

.history-table tbody td {
  border-top: none;
  vertical-align: middle;
}

.history-table tbody tr td:first-child {
  border-top-left-radius: 12px;
  border-bottom-left-radius: 12px;
}

.history-table tbody tr td:last-child {
  border-top-right-radius: 12px;
  border-bottom-right-radius: 12px;
}

.history-table__title {
  font-weight: 700;
}

.history-table__percent {
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  display: inline-block;
}

.history-table__percent.is-ok {
  background: #e6f6ef;
  color: #1a6b48;
}

.history-table__percent.is-low {
  background: #fdecec;
  color: #b03838;
}

.history-pagination {
  margin-top: 18px;
  display: flex;
  justify-content: center;
}

.pagination .page-link {
  border-radius: 12px;
  margin: 0 4px;
  border: 1px solid rgba(18, 32, 25, 0.1);
  color: var(--green-700);
}

.pagination .page-item.active .page-link {
  background: var(--green-600);
  border-color: var(--green-600);
  color: #fff;
}

.pagination .page-item.disabled .page-link {
  color: #9aa7a0;
}

.btn-primary {
  background: linear-gradient(135deg, var(--green-600), var(--green-500));
  border: none;
  box-shadow: 0 10px 20px rgba(43, 122, 82, 0.25);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--green-700), var(--green-600));
}

.btn-outline-primary {
  border-color: var(--green-600);
  color: var(--green-700);
}

.btn-outline-primary:hover {
  background: var(--green-600);
  color: #fff;
}

.badge {
  border-radius: 999px;
  padding: 0.4em 0.7em;
  font-weight: 600;
}

.form-control {
  border-radius: 12px;
  border: 1px solid rgba(18, 32, 25, 0.15);
  background: var(--cloud);
}

.form-control:focus {
  border-color: var(--green-600);
  box-shadow: 0 0 0 0.2rem rgba(58, 154, 103, 0.2);
}

.table {
  background: var(--card);
  border-radius: 16px;
  overflow: hidden;
}

.table thead th {
  background: var(--mint-100);
  border-bottom: 1px solid rgba(18, 32, 25, 0.08);
}

.alert {
  border-radius: 14px;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 991px) {
  .sidebar .sidebar-brand {
    margin: 10px 12px;
  }

  .card {
    border-radius: 14px;
  }
}