/* ===================================================================
   Silex · version D — couche ajoutée APRÈS silex-c.css.
   Aucune photo d'élève : le produit et la trace de l'élève (son écriture) portent l'émotion.
   Ajoute : visuel diagnostic (.dg), section « L'erreur devient la leçon » (.xer).
   =================================================================== */
:root {
  --err: #d64545;
  --err-bg: #fdeeee;
  --ok: #0b8fb2;
  --chalk: 'Caveat', 'Segoe Print', 'Bradley Hand', cursive;
}

/* ---------- écriture manuscrite et marques (partagées) ---------- */
.xhw {
  display: flex;
  align-items: center;
  gap: 0.5em;
  min-height: 2.3em;
}
.xhw__t {
  font-family: var(--chalk);
  font-weight: 600;
  font-size: 1.7em;
  line-height: 1;
  color: #1d3f6e;
  white-space: nowrap;
}
.xhw.is-bad .xhw__t {
  color: #1d3f6e;
}
.xhw.is-bad em {
  font-style: normal;
  color: var(--err);
  border: 2px solid var(--err);
  border-radius: 50%;
  padding: 0 0.18em;
  margin-left: 0.05em;
}
.xhw.is-dim {
  opacity: 0.35;
}
.mk {
  font-style: normal;
  font-weight: 800;
  font-size: 0.8em;
  width: 1.6em;
  height: 1.6em;
  border-radius: 50%;
  display: inline-grid;
  place-items: center;
  flex: none;
}
.mk--ok {
  background: #e3f4f9;
  color: var(--ok);
}
.mk--x {
  background: var(--err-bg);
  color: var(--err);
}
/* la vidéo de la notion (écran de « L'erreur devient la leçon ») */
.vid {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 43%;
  font-size: clamp(9px, 2.4cqw, 13.5px);
  background: #0f1a1f;
  border-radius: 1.3em;
  padding: 0.55em;
  box-shadow:
    0 18px 30px -12px rgba(10, 58, 69, 0.55),
    0 0 0 1px rgba(255, 255, 255, 0.06);
  transition:
    opacity 0.5s,
    transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.ui__scr {
  position: relative;
  aspect-ratio: 16/9;
  border-radius: 0.85em;
  overflow: hidden;
  background: linear-gradient(135deg, #097b99 0%, #0a3a45 70%);
  padding: 0.9em 1.1em;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.1em;
}
.ui__scr::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 85% 15%, rgba(63, 179, 212, 0.35), transparent 45%);
}
.ck {
  position: relative;
  font-family: var(--chalk);
  font-weight: 600;
  font-size: 1.55em;
  line-height: 1.1;
  color: #fff;
  transition:
    opacity 0.5s,
    transform 0.5s;
}
.js-d .xer:not([data-step='2']):not([data-step='3']) .ck {
  opacity: 0;
  transform: translateY(4px);
}
.ck3 {
  font-size: 1.05em;
  color: #bfe9f5;
}
.ck u {
  text-decoration: none;
  color: #3fb3d4;
}
.vid__pl {
  position: absolute;
  right: 0.8em;
  top: 0.7em;
  width: 1.9em;
  height: 1.9em;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
}
.vid__pl::after {
  content: '';
  position: absolute;
  left: 52%;
  top: 50%;
  transform: translate(-40%, -50%);
  border-left: 0.55em solid #fff;
  border-top: 0.36em solid transparent;
  border-bottom: 0.36em solid transparent;
}
.vid__pg {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 0.28em;
  background: rgba(255, 255, 255, 0.18);
}
.vid__pg::after {
  content: '';
  position: absolute;
  inset: 0 0 0 0;
  background: #3fb3d4;
  transition: right 0s;
}
.js-d .xer:not([data-step='2']):not([data-step='3']) .vid__pg::after {
  right: 100%;
}
.ui__vm {
  display: grid;
  gap: 0.15em;
  padding: 0.6em 0.35em 0.25em;
  color: #fff;
}
.vid__tg {
  font-size: 0.66em;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #3fb3d4;
}
.ui__vm b {
  font-size: 0.95em;
  line-height: 1.25;
}
.ui__vm span:last-child {
  font-size: 0.74em;
  color: #9fbac2;
}

/* ---------- 2. « Ce qui bloque » : le visuel diagnostic ---------- */
.dg {
  position: relative;
  aspect-ratio: 4/4.5;
  border-radius: 28px;
  background: linear-gradient(180deg, #f6fbfd, #eaf6fb);
  border: 1px solid #dcebf1;
  padding: 22px 24px 24px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 18px 44px rgba(20, 30, 50, 0.07);
  overflow: hidden;
}
.dg__hd {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.dg__hd span {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 6px 11px;
  border-radius: 999px;
  color: var(--sec);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid #dcebf1;
  transition: all 0.3s;
}
.dg[data-i='0'] .dg__hd span:nth-child(1),
.dg[data-i='1'] .dg__hd span:nth-child(2),
.dg[data-i='2'] .dg__hd span:nth-child(3) {
  background: var(--acc-btn);
  color: #fff;
  border-color: var(--acc-btn);
}
.dg__ps {
  position: relative;
  flex: 1;
  margin-top: 14px;
}
.dg__p {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity 0.5s,
    transform 0.5s;
  pointer-events: none;
}
.dg[data-i='0'] .dg__p:nth-child(1),
.dg[data-i='1'] .dg__p:nth-child(2),
.dg[data-i='2'] .dg__p:nth-child(3) {
  opacity: 1;
  transform: none;
}
.dg__cap {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.45;
  color: var(--ink);
  font-weight: 600;
  padding-top: 12px;
  border-top: 1px solid #dcebf1;
}
.dg__map {
  width: 100%;
  height: auto;
  overflow: visible;
  margin: auto 0;
}
.dg__col {
  font:
    700 11px/1 Inter,
    system-ui,
    sans-serif;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  fill: var(--sec);
  text-anchor: middle;
}
.dg__ln {
  fill: none;
  stroke: #b9d6e0;
  stroke-width: 1.6;
}
.dg__ln.is-bad {
  stroke: var(--err);
  stroke-width: 1.8;
  stroke-dasharray: 5 5;
  opacity: 0.75;
  animation: dgFlow 1.6s linear infinite;
}
@keyframes dgFlow {
  to {
    stroke-dashoffset: -20;
  }
}
.dg__nd rect {
  fill: #fff;
  stroke: #cfe3ea;
  stroke-width: 1.2;
}
.dg__nd text {
  font:
    600 12px/1 Inter,
    system-ui,
    sans-serif;
  fill: var(--ink);
  text-anchor: middle;
}
.dg__nd.is-gap rect {
  fill: var(--err-bg);
  stroke: var(--err);
  stroke-width: 1.8;
  stroke-dasharray: 4 3;
}
.dg__nd.is-gap text {
  fill: var(--err);
}
.dg__nd.is-hit rect {
  fill: #fff7f7;
  stroke: #f0c4c4;
}
.dg__q circle {
  fill: var(--err);
}
.dg__q text {
  font:
    800 12px/1 Inter,
    sans-serif;
  fill: #fff;
  text-anchor: middle;
}
.dg__ws {
  background: #fff;
  border: 1px solid #dcebf1;
  border-radius: 20px;
  padding: 16px 20px;
  font-size: 15px;
  background-image: repeating-linear-gradient(
    180deg,
    transparent 0 2.3em,
    #eef5f8 2.3em calc(2.3em + 1px)
  );
  background-position: 0 2.6em;
}
.dg__lbl,
.ui__lbl {
  display: block;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--acc-btn);
  margin-bottom: 6px;
}
.dg__fb,
.ui__fb {
  margin-top: 6px;
  background: var(--err-bg);
  border-left: 3px solid var(--err);
  border-radius: 9px;
  padding: 8px 11px;
  font-size: 0.84rem;
  line-height: 1.4;
  color: #5b2a2a;
}
.dg__fb b,
.ui__fb b {
  color: var(--err);
  margin-right: 6px;
}
.dg__wk {
  display: grid;
  gap: 18px;
  background: #fff;
  border: 1px solid #dcebf1;
  border-radius: 20px;
  padding: 18px 20px;
}
.dg__row {
  display: grid;
  gap: 8px;
}
.dg__rl {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sec);
}
.dg__bars {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
  height: 96px;
  align-items: end;
}
.dg__b {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  height: 100%;
  justify-content: flex-end;
}
.dg__b i {
  width: 100%;
  max-width: 26px;
  border-radius: 7px;
  height: max(4px, calc(var(--h) * 0.72px));
  background: #dfeef4;
  transition: height 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.dg__b.is-cram i {
  background: linear-gradient(180deg, #e06a6a, var(--err));
}
.dg__b.is-cram:nth-child(-n + 6) i {
  background: #eef3f5;
}
.dg__b.is-cram:nth-child(3) i {
  background: #f2b8b8;
}
.dg__b.is-ok i {
  background: linear-gradient(180deg, #3fb3d4, var(--acc-btn));
}
.dg__b em {
  font-style: normal;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--sec);
}
.dg__nt {
  font-size: 0.8rem;
  color: var(--sec);
}
/* liste synchronisée */
.bc li {
  cursor: pointer;
  position: relative;
  transition: opacity 0.3s;
}
.bc li::before {
  content: '';
  position: absolute;
  left: -18px;
  top: 22px;
  bottom: 22px;
  width: 3px;
  border-radius: 3px;
  background: var(--acc);
  transform: scaleY(0);
  transition: transform 0.35s;
}
.js-d .bc li {
  opacity: 0.55;
}
.js-d .bc li.on {
  opacity: 1;
}
.js-d .bc li.on::before {
  transform: scaleY(1);
}

/* ---------- 3. « L'erreur devient la leçon » ---------- */
.xer {
  border-top: 1px solid var(--line);
}
.xer__hd {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}
.xer__hd h2 {
  max-width: none;
}
.xer__lp {
  list-style: none;
  padding: 0;
  margin: 52px 0 0;
  display: grid;
  grid-template-columns: 1fr 54px 1.22fr 54px 1fr;
  align-items: start;
  gap: 0;
}
.xer__c {
  display: grid;
  gap: 10px;
  align-content: start;
}
.xer__c h3 {
  margin: 14px 0 0;
  display: flex;
  gap: 10px;
  align-items: baseline;
}
.xer__c h3::before {
  content: attr(data-n);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--acc-btn);
}
.xer__c p {
  margin: 0;
  color: var(--body);
}
.xer__c[data-k='1'] h3::before {
  content: '1';
}
.xer__c[data-k='2'] h3::before {
  content: '2';
}
.xer__c[data-k='3'] h3::before {
  content: '3';
}
.ui {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 16px 18px 18px;
  font-size: 13.5px;
  box-shadow: 0 14px 34px rgba(20, 30, 50, 0.06);
  transition:
    transform 0.45s cubic-bezier(0.2, 0.8, 0.2, 1),
    box-shadow 0.45s;
  min-height: 258px;
}
.ui .xhw {
  min-height: 2.15em;
}
.ui .xhw__t {
  font-size: 1.6em;
}
.ui__chip {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--acc-btn);
  background: #e3f4f9;
  border-radius: 999px;
  padding: 5px 10px;
}
.ui__chip--ok {
  color: #fff;
  background: var(--acc-btn);
}
.ui--v {
  background: #0f1a1f;
  border-color: #0f1a1f;
  padding: 9px;
  font-size: 14px;
}
.ui--v .ck {
  font-size: 1.75em;
}
.ui--v .ck3 {
  font-size: 1.1em;
}
.xer__c.on .ui {
  transform: translateY(-6px);
  box-shadow:
    0 0 0 2px var(--acc2),
    0 26px 50px -18px rgba(11, 143, 178, 0.35);
}
.xer__c--v.on .ui {
  box-shadow:
    0 0 0 2px var(--acc2),
    0 30px 60px -18px rgba(10, 58, 69, 0.55);
}
.xer[data-step='2'] .ck1 {
  transition-delay: 0.3s;
}
.xer[data-step='2'] .ck2 {
  transition-delay: 1s;
}
.xer[data-step='2'] .ck3 {
  transition-delay: 1.7s;
}
.xer[data-step='2'] .vid__pg::after {
  transition: right 3s linear 0.2s;
}

.xer__ar {
  align-self: start;
  margin-top: 104px;
  display: grid;
  place-items: center;
}
.xer__ar svg {
  width: 46px;
  height: 16px;
  overflow: visible;
}
.xer__ar path {
  fill: none;
  stroke: #b9d6e0;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke 0.4s;
}
.xer[data-step='2'] .xer__ar:nth-child(2) path,
.xer[data-step='3'] .xer__ar path {
  stroke: var(--acc);
}
/* fiches de révision */
.xer__fi {
  margin-top: 84px;
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: center;
  background: linear-gradient(180deg, #f6fbfd, #eaf6fb);
  border: 1px solid #dcebf1;
  border-radius: 36px;
  padding: 48px 56px;
  overflow: hidden;
}
.xer__ft h3 {
  font-size: clamp(1.4rem, 2.2vw, 1.9rem);
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin: 12px 0 10px;
}
.xer__ft p {
  margin: 0;
  color: var(--body);
}
.fan {
  position: relative;
  height: 250px;
}
.xfc {
  position: absolute;
  top: 18px;
  left: 50%;
  width: 236px;
  margin-left: -118px;
  background: #fff;
  border-radius: 18px;
  padding: 16px 18px 18px;
  box-shadow: 0 18px 40px rgba(20, 30, 50, 0.12);
  border-top: 5px solid var(--acc);
  display: grid;
  gap: 7px;
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.xfc__s {
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--acc-btn);
}
.xfc b {
  font-size: 1rem;
  line-height: 1.25;
  color: var(--ink);
}
.xfc p {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--body);
}
.xfc__ex {
  font-family: var(--chalk);
  font-weight: 600;
  font-size: 1.25rem;
  color: #1d3f6e;
  border-top: 1px dashed #d6e6ec;
  padding-top: 6px;
}
.xfc--1 {
  transform: translateX(-178px) rotate(-5deg);
  border-top-color: #3fb3d4;
}
.xfc--2 {
  transform: translateY(-6px);
  z-index: 2;
}
.xfc--3 {
  transform: translateX(178px) rotate(5deg);
  border-top-color: #0a3a45;
}
.fan:hover .xfc--1 {
  transform: translateX(-196px) rotate(-7deg);
}
.fan:hover .xfc--3 {
  transform: translateX(196px) rotate(7deg);
}
.fan:hover .xfc--2 {
  transform: translateY(-14px);
}

/* ---------- responsive ---------- */
@media (max-width: 1180px) {
  .xer__lp {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 28px;
  }
  .xer__ar {
    display: none;
  }
  .xer__fi {
    grid-template-columns: 1fr;
    padding: 40px;
  }
}
@media (max-width: 980px) {
  .dg {
    aspect-ratio: auto;
    min-height: 520px;
  }
}
@media (max-width: 760px) {
  .vid {
    font-size: 10.5px;
  }
  .vid {
    width: 56%;
    right: -6px;
  }
  .bc__g > .dg {
    order: 0;
  }
  .dg {
    min-height: 430px;
    padding: 18px;
  }
  .dg__hd span {
    font-size: 0.68rem;
    padding: 5px 9px;
  }
  .js-d .bc li {
    opacity: 1;
  }
  .bc li::before {
    left: -12px;
  }
  .xer__lp {
    grid-template-columns: 1fr;
    gap: 36px;
    margin-top: 36px;
  }
  .ui {
    min-height: 0;
  }
  .xer__fi {
    padding: 30px 22px 26px;
    margin-top: 56px;
    gap: 28px;
    border-radius: 28px;
  }
  .fan {
    height: 236px;
  }
  .xfc {
    width: 228px;
    margin-left: -114px;
    padding: 14px 15px 15px;
  }
  .xfc--1 > *,
  .xfc--3 > * {
    visibility: hidden;
  }
  .xfc--1 {
    transform: translateX(-40px) rotate(-7deg) scale(0.94);
  }
  .xfc--3 {
    transform: translateX(40px) rotate(7deg) scale(0.94);
  }
  .fan:hover .xfc--1 {
    transform: translateX(-40px) rotate(-7deg) scale(0.94);
  }
  .fan:hover .xfc--3 {
    transform: translateX(40px) rotate(7deg) scale(0.94);
  }
}
@media (prefers-reduced-motion: reduce) {
  .dg__ln.is-bad {
    animation: none;
  }
  .xer *,
  .dg * {
    transition: none !important;
  }
}