/* ============================================================
 * Composants interactifs — Home, Flashcards, Quiz, Tracker
 * ============================================================ */

/* === HOME : HERO === */
.nsi-home { padding: 2rem 0 0; }

.nsi-terminal {
  border: 1px solid var(--nsi-rule);
  background: var(--nsi-panel);
  border-radius: var(--radius);
  overflow: hidden;
  max-width: 56rem;
  margin: 0 auto 2.5rem;
  box-shadow: 0 30px 80px -20px rgba(0, 0, 0, 0.5);
}
.nsi-terminal__bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  background: var(--nsi-bg);
  border-bottom: 1px solid var(--nsi-rule);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--nsi-muted);
}
.nsi-terminal__dot { width: 11px; height: 11px; border-radius: 50%; }
.nsi-terminal__dot--r { background: #ff5f56; }
.nsi-terminal__dot--y { background: #ffbd2e; }
.nsi-terminal__dot--g { background: #27c93f; }
.nsi-terminal__title { margin-left: auto; }

.nsi-terminal__body {
  padding: 1.4rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--nsi-fg);
  min-height: 280px;
}
.nsi-terminal__line { white-space: pre-wrap; }
.nsi-terminal__prompt { color: var(--nsi-accent); }
.nsi-terminal__cmd { color: var(--nsi-fg); }
.nsi-terminal__comment { color: var(--nsi-muted); }
.nsi-terminal__k { color: var(--nsi-magenta); }
.nsi-terminal__s { color: var(--nsi-amber); }
.nsi-terminal__n { color: var(--nsi-blue); }
.nsi-terminal__cursor {
  display: inline-block;
  width: 0.55em;
  height: 1em;
  background: var(--nsi-accent);
  vertical-align: -0.1em;
  animation: nsi-blink 1s steps(1) infinite;
}
@keyframes nsi-blink { 50% { opacity: 0; } }

/* === Titre de section === */
.nsi-section {
  margin: 3rem auto;
  max-width: 58rem;
  padding: 0 1rem;
}
.nsi-section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.2rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px dashed var(--nsi-rule);
}
.nsi-section__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--nsi-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.nsi-section__title {
  font-family: var(--font-sans);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--nsi-fg);
  letter-spacing: -0.02em;
}
.nsi-section__meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--nsi-muted);
}

/* === Stats ligne === */
.nsi-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--nsi-rule);
  border: 1px solid var(--nsi-rule);
  border-radius: var(--radius);
  margin: 0 auto 2rem;
  max-width: 56rem;
  overflow: hidden;
}
@media (max-width: 640px) { .nsi-stats { grid-template-columns: repeat(2, 1fr); } }

.nsi-stat {
  padding: 1.2rem 1rem;
  background: var(--nsi-panel);
  display: flex; flex-direction: column; gap: 0.2rem;
  position: relative;
}
.nsi-stat__label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--nsi-muted);
}
.nsi-stat__value {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--nsi-accent);
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.nsi-stat__value small {
  font-size: 0.7rem;
  color: var(--nsi-muted);
  margin-left: 0.3rem;
  font-weight: 500;
}

/* === Tracker de progression === */
.nsi-tracker {
  border: 1px solid var(--nsi-rule);
  background: var(--nsi-panel);
  border-radius: var(--radius);
  padding: 1.2rem;
  margin: 0 auto 2rem;
  max-width: 56rem;
}
.nsi-tracker__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.nsi-tracker__title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--nsi-fg);
  font-weight: 600;
}
.nsi-tracker__progress {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--nsi-accent);
  font-variant-numeric: tabular-nums;
}
.nsi-tracker__bar {
  height: 6px;
  background: var(--nsi-bg);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 1rem;
}
.nsi-tracker__bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--nsi-accent), var(--nsi-blue));
  width: 0%;
  transition: width 600ms var(--ease);
}
.nsi-tracker__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.5rem;
}
.nsi-tracker__item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--nsi-rule);
  border-radius: 6px;
  background: var(--nsi-bg);
  cursor: pointer;
  transition: border-color var(--dur), background var(--dur);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--nsi-fg);
}
.nsi-tracker__item:hover { border-color: var(--nsi-accent); }
.nsi-tracker__item.is-done {
  background: var(--md-accent-fg-color--transparent);
  border-color: var(--nsi-accent);
}
.nsi-tracker__item.is-done .nsi-tracker__title-txt {
  text-decoration: line-through;
  opacity: 0.6;
}
.nsi-tracker__check {
  width: 14px; height: 14px;
  border: 1.5px solid var(--nsi-dim);
  border-radius: 3px;
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--dur);
}
.nsi-tracker__item.is-done .nsi-tracker__check {
  background: var(--nsi-accent);
  border-color: var(--nsi-accent);
  color: var(--nsi-bg);
}
.nsi-tracker__check::before {
  content: "✓";
  font-size: 11px;
  line-height: 1;
  opacity: 0;
  font-weight: 700;
}
.nsi-tracker__item.is-done .nsi-tracker__check::before { opacity: 1; }
.nsi-tracker__num { color: var(--nsi-muted); font-weight: 500; }

/* === Drill du jour === */
.nsi-drill {
  border: 1px solid var(--nsi-rule);
  background: linear-gradient(135deg, var(--nsi-panel), var(--nsi-bg));
  border-radius: var(--radius);
  padding: 1.8rem;
  margin: 0 auto 2rem;
  max-width: 56rem;
  position: relative;
  overflow: hidden;
}
.nsi-drill::before {
  content: "";
  position: absolute;
  top: 0; right: 0;
  width: 160px; height: 160px;
  background: radial-gradient(circle, var(--md-accent-fg-color--transparent) 0%, transparent 70%);
  pointer-events: none;
}
.nsi-drill__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--nsi-accent);
  margin-bottom: 0.5rem;
}
.nsi-drill__q {
  font-family: var(--font-sans);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--nsi-fg);
  margin-bottom: 1rem;
  letter-spacing: -0.015em;
}
.nsi-drill__a {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--nsi-fg);
  padding: 0.8rem 1rem;
  background: var(--nsi-bg);
  border-left: 2px solid var(--nsi-accent);
  border-radius: 6px;
  display: none;
  animation: nsi-reveal 400ms var(--ease);
}
.nsi-drill__a.is-visible { display: block; }
@keyframes nsi-reveal {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}
.nsi-drill__actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

/* === Boutons === */
.nsi-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  border-radius: 6px;
  background: var(--nsi-accent);
  color: var(--nsi-bg) !important;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.78rem;
  text-decoration: none !important;
  border: 1px solid var(--nsi-accent);
  cursor: pointer;
  transition: all var(--dur) var(--ease);
}
.nsi-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 12px var(--md-accent-fg-color--transparent); }
.nsi-btn--ghost {
  background: transparent;
  color: var(--nsi-fg) !important;
  border-color: var(--nsi-rule);
}
.nsi-btn--ghost:hover { border-color: var(--nsi-accent); color: var(--nsi-accent) !important; }

/* === Bento des fiches === */
.nsi-bento {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.7rem;
}
@media (max-width: 900px) { .nsi-bento { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 500px) { .nsi-bento { grid-template-columns: 1fr; } }

.nsi-card {
  grid-column: span 2;
  display: flex; flex-direction: column; justify-content: space-between;
  padding: 1.1rem 1.2rem;
  background: var(--nsi-panel);
  border: 1px solid var(--nsi-rule);
  border-radius: var(--radius);
  text-decoration: none !important;
  color: var(--nsi-fg);
  min-height: 140px;
  position: relative;
  overflow: hidden;
  transition: transform var(--dur) var(--ease), border-color var(--dur), background var(--dur);
}
.nsi-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--x, 50%) var(--y, 50%), var(--md-accent-fg-color--transparent), transparent 40%);
  opacity: 0;
  transition: opacity var(--dur);
  pointer-events: none;
}
.nsi-card:hover { transform: translateY(-2px); border-color: var(--nsi-accent); }
.nsi-card:hover::before { opacity: 1; }
.nsi-card--wide { grid-column: span 3; }
.nsi-card--large { grid-column: span 4; min-height: 180px; }
.nsi-card--full { grid-column: span 6; }
@media (max-width: 900px) {
  .nsi-card, .nsi-card--wide, .nsi-card--large, .nsi-card--full { grid-column: span 2; }
}
@media (max-width: 500px) {
  .nsi-card, .nsi-card--wide, .nsi-card--large, .nsi-card--full { grid-column: span 1; }
}
.nsi-card__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--nsi-muted);
  margin-bottom: 0.4rem;
  letter-spacing: 0.06em;
}
.nsi-card__title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--nsi-fg);
  margin: 0 0 0.4rem;
  letter-spacing: -0.015em;
}
.nsi-card__desc {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--nsi-muted);
  line-height: 1.5;
  margin: 0;
  flex: 1;
}
.nsi-card__foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--nsi-muted);
}
.nsi-card__arrow {
  color: var(--nsi-muted);
  transition: transform var(--dur), color var(--dur);
}
.nsi-card:hover .nsi-card__arrow { transform: translateX(3px); color: var(--nsi-accent); }
.nsi-card--accent { background: var(--nsi-fg); color: var(--nsi-bg); border-color: var(--nsi-fg); }
.nsi-card--accent .nsi-card__num,
.nsi-card--accent .nsi-card__title,
.nsi-card--accent .nsi-card__desc,
.nsi-card--accent .nsi-card__foot { color: var(--nsi-bg); }
.nsi-card--accent:hover { background: var(--nsi-accent); border-color: var(--nsi-accent); }
.nsi-card--study { border-color: var(--nsi-accent); }
.nsi-card--study::after {
  content: "✓";
  position: absolute;
  top: 1rem; right: 1rem;
  color: var(--nsi-accent);
  font-weight: 700;
  font-size: 1rem;
}

/* Marquee défilant */
.nsi-marquee {
  overflow: hidden;
  border-top: 1px solid var(--nsi-rule);
  border-bottom: 1px solid var(--nsi-rule);
  padding: 0.9rem 0;
  margin: 3rem 0;
  background: var(--nsi-panel);
}
.nsi-marquee__track {
  display: flex;
  animation: nsi-marquee 60s linear infinite;
  gap: 3rem;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--nsi-muted);
}
.nsi-marquee__item { display: inline-flex; gap: 0.6rem; align-items: center; }
.nsi-marquee__item::before { content: "◆"; color: var(--nsi-accent); }
@keyframes nsi-marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* === FLASHCARDS === */
.nsi-flash-wrap {
  max-width: 42rem;
  margin: 2rem auto;
  padding: 0 1rem;
}
.nsi-flash-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--nsi-muted);
  margin-bottom: 0.8rem;
}
.nsi-flash-meta strong { color: var(--nsi-accent); font-weight: 600; }
.nsi-flash {
  perspective: 1200px;
  height: 320px;
  margin-bottom: 1rem;
}
.nsi-flash__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 600ms var(--ease);
  transform-style: preserve-3d;
  cursor: pointer;
}
.nsi-flash.is-flipped .nsi-flash__inner { transform: rotateY(180deg); }
.nsi-flash__side {
  position: absolute; inset: 0;
  border: 1px solid var(--nsi-rule);
  background: var(--nsi-panel);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}
.nsi-flash__side--back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, var(--nsi-panel), var(--nsi-bg));
  border-color: var(--nsi-accent);
}
.nsi-flash__q {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--nsi-fg);
  line-height: 1.4;
}
.nsi-flash__a {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--nsi-fg);
  max-height: 100%;
  overflow-y: auto;
  text-align: left;
  width: 100%;
}
.nsi-flash__a code { color: var(--nsi-accent); }
.nsi-flash__tag {
  position: absolute;
  top: 1rem; left: 1rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--nsi-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.nsi-flash__hint {
  position: absolute;
  bottom: 1rem; right: 1rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--nsi-muted);
}

.nsi-flash-actions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  margin-top: 1rem;
}
@media (max-width: 540px) { .nsi-flash-actions { grid-template-columns: repeat(2, 1fr); } }
.nsi-flash-btn {
  padding: 0.7rem 0.5rem;
  border: 1px solid var(--nsi-rule);
  background: var(--nsi-panel);
  color: var(--nsi-fg);
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  transition: all var(--dur);
}
.nsi-flash-btn:hover { border-color: var(--nsi-accent); }
.nsi-flash-btn--again { border-color: #ef4444; color: #ef4444; }
.nsi-flash-btn--hard  { border-color: var(--nsi-amber); color: var(--nsi-amber); }
.nsi-flash-btn--good  { border-color: var(--nsi-blue); color: var(--nsi-blue); }
.nsi-flash-btn--easy  { border-color: var(--nsi-accent); color: var(--nsi-accent); }
.nsi-flash-btn:hover { transform: translateY(-1px); }

.nsi-flash-filters {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}
.nsi-flash-filter {
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--nsi-rule);
  background: var(--nsi-panel);
  color: var(--nsi-muted);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  cursor: pointer;
  transition: all var(--dur);
}
.nsi-flash-filter:hover { color: var(--nsi-fg); }
.nsi-flash-filter.is-active {
  background: var(--nsi-accent);
  color: var(--nsi-bg);
  border-color: var(--nsi-accent);
}

/* === QUIZ === */
.nsi-quiz-wrap {
  max-width: 44rem;
  margin: 2rem auto;
  padding: 0 1rem;
}
.nsi-quiz-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--nsi-muted);
}
.nsi-quiz-score strong { color: var(--nsi-accent); }
.nsi-quiz-progress {
  height: 4px;
  background: var(--nsi-panel);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}
.nsi-quiz-progress__fill {
  height: 100%;
  background: var(--nsi-accent);
  transition: width 300ms var(--ease);
}
.nsi-quiz-card {
  border: 1px solid var(--nsi-rule);
  background: var(--nsi-panel);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
}
.nsi-quiz-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--nsi-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.7rem;
}
.nsi-quiz-q {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.15rem;
  line-height: 1.4;
  color: var(--nsi-fg);
  margin-bottom: 1.4rem;
}
.nsi-quiz-q code { color: var(--nsi-accent); background: var(--nsi-bg); }
.nsi-quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.nsi-quiz-option {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--nsi-rule);
  background: var(--nsi-bg);
  border-radius: 8px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--nsi-fg);
  text-align: left;
  transition: all var(--dur);
}
.nsi-quiz-option:hover:not([disabled]) {
  border-color: var(--nsi-accent);
  transform: translateX(3px);
}
.nsi-quiz-option[disabled] { cursor: default; }
.nsi-quiz-option__letter {
  width: 22px; height: 22px;
  border: 1px solid var(--nsi-rule);
  border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  flex-shrink: 0;
  color: var(--nsi-muted);
  transition: all var(--dur);
}
.nsi-quiz-option.is-correct {
  background: var(--md-accent-fg-color--transparent);
  border-color: var(--nsi-accent);
}
.nsi-quiz-option.is-correct .nsi-quiz-option__letter {
  background: var(--nsi-accent);
  color: var(--nsi-bg);
  border-color: var(--nsi-accent);
}
.nsi-quiz-option.is-wrong {
  background: rgba(239, 68, 68, 0.08);
  border-color: #ef4444;
}
.nsi-quiz-option.is-wrong .nsi-quiz-option__letter {
  background: #ef4444; color: white; border-color: #ef4444;
}
.nsi-quiz-exp {
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  background: var(--nsi-bg);
  border-left: 2px solid var(--nsi-accent);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--nsi-fg);
  display: none;
}
.nsi-quiz-exp.is-visible { display: block; animation: nsi-reveal 300ms var(--ease); }
.nsi-quiz-actions {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 1.2rem;
}

/* Reveal */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 600ms var(--ease), transform 600ms var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* Scramble */
.nsi-scramble { display: inline-block; font-variant-numeric: tabular-nums; }