/* ── F.E. Study Phase 1: dashboard, search, exam, handbook, flashcards ── */

.fe-tools {
  margin-bottom: 2.5rem;
}

.fe-tools__grid {
  display: grid;
  gap: 0.85rem;
}

@media (min-width: 640px) {
  .fe-tools__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.fe-tool-card {
  display: block;
  padding: 1rem 1.15rem;
  border: 1px solid var(--aeon-border);
  border-radius: 2px;
  background: var(--aeon-card);
  text-decoration: none;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.fe-tool-card:hover {
  border-color: var(--aeon-accent);
  transform: translateY(-1px);
}

.fe-tool-card__title {
  display: block;
  font-size: 1.15rem;
  color: var(--aeon-text);
  margin-bottom: 0.35rem;
}

.fe-tool-card__desc {
  display: block;
  font-size: 0.92rem;
  color: var(--aeon-muted);
  line-height: 1.45;
}

.fe-tool-card__action {
  display: block;
  margin-top: 0.65rem;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--aeon-mono);
}

.fe-dashboard {
  margin-bottom: 2.5rem;
}

.fe-dashboard__grid {
  display: grid;
  gap: 0.85rem;
}

@media (min-width: 640px) {
  .fe-dashboard__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.fe-dashboard__card {
  padding: 1rem 1.1rem;
  border: 1px solid var(--aeon-border);
  border-radius: 2px;
  background: var(--aeon-card);
}

.fe-dashboard__label {
  margin: 0 0 0.5rem;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--aeon-mono);
}

.fe-dashboard__value {
  margin: 0;
  font-size: 1.75rem;
  color: var(--aeon-text);
  line-height: 1.1;
}

.fe-dashboard__of {
  font-size: 1rem;
  color: var(--aeon-muted);
}

.fe-dashboard__meta {
  margin: 0.45rem 0 0;
  font-size: 0.72rem;
  color: var(--aeon-muted);
}

.fe-dashboard__meta a {
  color: var(--aeon-accent);
  text-decoration: none;
}

.fe-dashboard__bar {
  margin-top: 0.75rem;
  height: 4px;
  background: var(--aeon-border);
  border-radius: 999px;
  overflow: hidden;
}

.fe-dashboard__bar span {
  display: block;
  height: 100%;
  background: var(--aeon-accent);
}

.fe-dashboard__empty {
  margin-top: 1rem;
  font-size: 0.95rem;
}

.fe-weak {
  margin-top: 1.25rem;
}

.fe-weak__heading {
  margin: 0 0 0.65rem;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--aeon-mono);
}

.fe-weak__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.fe-weak__link {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--aeon-border);
  border-radius: 2px;
  text-decoration: none;
  background: color-mix(in srgb, var(--aeon-card) 90%, transparent);
}

.fe-weak__link:hover {
  border-color: var(--aeon-accent);
}

.fe-weak__title {
  color: var(--aeon-text);
  font-size: 1rem;
}

.fe-weak__stat {
  color: var(--aeon-mono);
  font-size: 0.68rem;
  white-space: nowrap;
}

/* Exam */
.exam-setup {
  padding: 1.25rem 1.35rem;
  border: 1px solid var(--aeon-border);
  border-radius: 2px;
  background: var(--aeon-card);
}

.exam-setup__grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 480px) {
  .exam-setup__grid {
    grid-template-columns: 1fr 1fr;
  }
}

.exam-setup label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--aeon-mono);
}

.exam-setup select {
  width: 100%;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--aeon-border);
  border-radius: 2px;
  background: var(--aeon-bg);
  color: var(--aeon-text);
}

.exam-timer {
  font-size: 1.35rem;
  letter-spacing: 0.08em;
  color: var(--aeon-text);
}

.exam-timer.is-low {
  color: #b45309;
}

.exam-topic-tag {
  margin: 0.35rem 0 0;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--aeon-mono);
}

.exam-summary__score {
  font-size: 2rem;
  margin: 0 0 0.35rem;
}

.exam-summary__meta {
  margin: 0;
  font-size: 0.75rem;
  color: var(--aeon-muted);
}

/* Handbook */
.handbook-search {
  width: 100%;
  margin-bottom: 1.25rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--aeon-border);
  border-radius: 2px;
  background: var(--aeon-card);
  color: var(--aeon-text);
}

.handbook-section {
  margin-bottom: 2rem;
}

.handbook-section__title {
  font-size: 1.35rem;
  margin: 0 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--aeon-border);
}

.handbook-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.handbook-item {
  padding: 0.9rem 1rem;
  border: 1px solid var(--aeon-border);
  border-radius: 2px;
  background: var(--aeon-card);
}

.handbook-item__head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  margin-bottom: 0.5rem;
}

.handbook-item__name {
  margin: 0;
  font-size: 1.05rem;
}

.handbook-item__lesson {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--aeon-accent);
  text-decoration: none;
}

.handbook-item__formula {
  margin: 0;
}

/* Flashcards */
.flashcards-app {
  display: grid;
  gap: 1rem;
}

.flashcards-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: center;
}

.flashcards-controls select {
  flex: 1;
  min-width: 12rem;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--aeon-border);
  border-radius: 2px;
  background: var(--aeon-card);
  color: var(--aeon-text);
}

.flashcard {
  position: relative;
  min-height: 12rem;
  padding: 1.5rem 1.25rem;
  border: 1px solid var(--aeon-border);
  border-radius: 2px;
  background: var(--aeon-card);
  cursor: pointer;
  perspective: 800px;
}

.flashcard__inner {
  transition: transform 0.35s ease;
  transform-style: preserve-3d;
}

.flashcard.is-flipped .flashcard__inner {
  transform: rotateY(180deg);
}

.flashcard__face {
  backface-visibility: hidden;
}

.flashcard__back {
  position: absolute;
  inset: 1.5rem 1.25rem;
  transform: rotateY(180deg);
}

.flashcard__label {
  margin: 0 0 0.5rem;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--aeon-mono);
}

.flashcard__text {
  margin: 0;
  font-size: 1.15rem;
  line-height: 1.5;
  color: var(--aeon-text);
}

.flashcards-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: space-between;
  align-items: center;
}

.flashcards-toolbar button {
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--aeon-border);
  border-radius: 2px;
  background: var(--aeon-card);
  color: var(--aeon-text);
  cursor: pointer;
}

.flashcards-toolbar button:hover {
  border-color: var(--aeon-accent);
  color: var(--aeon-accent);
}

.flashcards-progress {
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--aeon-mono);
}

@media (max-width: 640px) {
  .fe-dashboard__value {
    font-size: 1.5rem;
  }

  .fe-weak__link {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }

  .fe-weak__stat {
    white-space: normal;
  }

  .exam-setup {
    padding: 1rem;
  }

  .exam-setup select {
    min-height: 2.75rem;
    font-size: 1rem;
  }

  .exam-setup .practice-submit {
    width: 100%;
    min-height: 2.75rem;
  }

  .exam-setup__grid {
    grid-template-columns: 1fr;
  }

  .exam-timer {
    font-size: 1.15rem;
    margin-left: auto;
  }

  .practice-card__head .exam-timer {
    width: 100%;
    text-align: right;
  }

  .handbook-item__head {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }

  .handbook-item {
    padding: 0.85rem 0.9rem;
  }

  .handbook-item__formula {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .flashcards-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .flashcards-controls select {
    min-width: 0;
    width: 100%;
    min-height: 2.75rem;
  }

  .flashcards-toolbar {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .flashcards-toolbar > div {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .flashcards-toolbar button {
    flex: 1 1 calc(50% - 0.25rem);
    min-height: 2.75rem;
    min-width: 0;
  }

  .flashcard {
    min-height: 10rem;
    padding: 1.25rem 1rem;
  }

  .flashcard__text {
    font-size: 1.05rem;
  }
}