.nav a,
.pill,
.chip,
.button,
.stat-card,
.feature-card,
.detail-block,
.quiz-card,
.challenge-card,
.bucket-card,
.control-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.nav a {
  padding: 10px 14px;
  box-shadow: none;
  color: var(--text-muted);
  transition: color 180ms ease, border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.nav a.is-active,
.nav a:hover {
  color: var(--surface-ink);
  border-color: rgba(21, 76, 138, 0.28);
  background: rgba(21, 76, 138, 0.08);
  transform: translateY(-1px);
}

.pill-row,
.meta-row,
.chip-row,
.button-row,
.fact-list,
.source-list,
.quick-actions,
.bucket-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pill,
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--text-muted);
  box-shadow: none;
}

.chip {
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease;
}

.chip--link {
  color: var(--surface-ink);
  text-decoration: none;
}

.chip:hover,
.chip.is-active {
  color: var(--surface-ink);
  border-color: rgba(21, 76, 138, 0.28);
  background: rgba(21, 76, 138, 0.08);
}

.grade-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 34px;
  padding: 0 10px;
  border-radius: 999px;
  font-weight: 700;
}

.grade-badge--mini {
  min-width: 28px;
  height: 28px;
  padding: 0 8px;
  font-size: 0.82rem;
}

.grade-badge[data-grade="A"] {
  color: #0d3d73;
  background: #dceafb;
}

.grade-badge[data-grade="B"] {
  color: #3e5a19;
  background: #e5f0d3;
}

.grade-badge[data-grade="C"] {
  color: #875100;
  background: #f6e6bf;
}

.grade-badge[data-grade="D"] {
  color: #8f3025;
  background: #f8d7d1;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 16px;
  color: var(--surface-ink);
  font-weight: 600;
  box-shadow: none;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
  border-color: rgba(21, 76, 138, 0.3);
}

.button--primary {
  color: #f8fbff;
  border-color: transparent;
  background: linear-gradient(135deg, #173e72 0%, #275fa5 100%);
}

.button--secondary {
  background: rgba(21, 76, 138, 0.08);
}

.button--ghost {
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.58);
}

.button--danger {
  color: var(--danger);
  background: var(--danger-soft);
}

.stat-card,
.control-card,
.quiz-card,
.challenge-card,
.bucket-card {
  padding: 18px;
}

.stat-card strong,
.control-card strong {
  display: block;
  margin-bottom: 8px;
  color: var(--text-muted);
  font-size: 0.84rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.stat-card span {
  display: block;
  font-size: 1.85rem;
  font-weight: 700;
}

.stat-card p {
  margin-top: 6px;
  color: var(--text-muted);
}

.feature-card {
  display: grid;
  gap: 16px;
  padding: 22px;
  transition: transform 180ms ease, border-color 180ms ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(21, 76, 138, 0.26);
}

.feature-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.feature-card__title {
  font-size: 1.2rem;
  line-height: 1.35;
}

.feature-card__summary,
.feature-card__meta,
.detail-block p,
.empty-state p,
.control-card p,
.bucket-card p,
.quiz-card p,
.challenge-card p {
  color: var(--text-muted);
  line-height: 1.7;
}

.feature-card__summary,
.detail-block p,
.challenge-card p,
.source-item__meta {
  font-family: var(--font-serif);
}

.feature-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  font-size: 0.92rem;
}

.feature-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.feature-card__save {
  min-width: 112px;
}

.feature-card__save.is-saved {
  color: var(--accent);
  background: var(--accent-soft);
}

.detail-shell {
  display: grid;
  grid-template-columns: 1.5fr 0.9fr;
  gap: 18px;
}

.detail-main,
.detail-side {
  display: grid;
  gap: 18px;
}

.detail-block {
  padding: 22px;
}

.detail-block h2,
.detail-block h3 {
  margin-bottom: 12px;
  font-size: 1.18rem;
}

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

.detail-list li {
  padding-left: 16px;
  color: var(--text-muted);
  line-height: 1.65;
  position: relative;
}

.detail-list li::before {
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--accent);
  content: "";
}

.source-item {
  display: grid;
  gap: 8px;
}

.source-item__head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.source-item__title {
  color: var(--surface-ink);
  font-weight: 600;
  text-decoration: none;
}

.source-item__title:hover {
  text-decoration: underline;
}

.source-item__meta {
  font-size: 0.92rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.field label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.field input,
.field select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.9);
}

.field input:focus,
.field select:focus {
  outline: 2px solid rgba(21, 76, 138, 0.18);
  border-color: rgba(21, 76, 138, 0.36);
}

.empty-state {
  padding: 26px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-md);
  text-align: center;
}

.quiz-choice {
  width: 100%;
  justify-content: flex-start;
}

.quiz-choice.is-correct {
  color: #174f21;
  background: #e4f4df;
}

.quiz-choice.is-wrong {
  color: #8f3025;
  background: #fbe1db;
}

.challenge-track {
  position: relative;
  height: 18px;
  margin: 18px 0;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(21, 76, 138, 0.12), rgba(21, 76, 138, 0.24));
  overflow: hidden;
}

.challenge-target,
.challenge-marker {
  position: absolute;
  top: 0;
  height: 100%;
  border-radius: 999px;
}

.challenge-target {
  width: 18%;
  background: rgba(177, 58, 38, 0.25);
}

.challenge-marker {
  width: 14px;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(21, 76, 138, 0.14);
  transform: translateX(-50%);
}

.bucket-board {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.bucket-card h2 {
  margin-bottom: 10px;
  font-size: 1.08rem;
}

.bucket-card__count {
  margin-bottom: 16px;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.bucket-list {
  display: grid;
  gap: 12px;
}

.mini-card {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.84);
}

.mini-card h3 {
  margin-bottom: 6px;
  font-size: 1rem;
}

.mini-card p {
  margin-bottom: 12px;
  color: var(--text-muted);
  font-size: 0.94rem;
  line-height: 1.6;
}

@media (max-width: 960px) {
  .detail-shell,
  .bucket-board,
  .form-grid {
    grid-template-columns: 1fr;
  }
}