/* ═══════════════════════════════════════════════════════════════
   VALED — Editorial section system (chapters + stages)
   Paper & lime: warm paper bg, white stages, one lime accent.
   Extends styles.css tokens (:root). Fonts: Domine + DM Sans.
   ═══════════════════════════════════════════════════════════════ */

:root{
  /* Aurora pigment — soft lime for blurred glows (rgb triplet) */
  --g-lime: 132, 204, 22;
  /* Stage accents (map of the feature-file tokens onto brand) */
  --accent: var(--lime);        /* #BDFD50 */
  --accent-deep: var(--limed);  /* #5A8200 */
  --accent-ink: #1A2200;
}

/* ─────────── Chapter layout ─────────── */
.chapter{
  max-width:1280px;
  margin:0 auto;
  padding:clamp(64px,9vh,110px) 48px;
  display:grid;
  grid-template-columns:1fr 1.1fr;
  gap:clamp(40px,6vw,72px);
  align-items:center;
}
.chapter-copy{ max-width:480px; }
.chapter--flip .chapter-copy{ order:2; justify-self:end; }
.chapter--flip .chapter-stage-wrap{ order:1; }

.eyebrow{
  font-size:12px;
  font-weight:600;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--t3);
  margin-bottom:20px;
}
.eyebrow .eyebrow-num{
  color:var(--limed);
  margin-right:10px;
}
.eyebrow .eyebrow-icon{
  display:block;
  width:40px;
  height:40px;
  margin-bottom:14px;
}
.eyebrow .eyebrow-icon svg{ width:100%; height:100%; overflow:visible; display:block; }
.eyebrow .eyebrow-icon .ti-fill{ fill:rgba(17,17,16,.10); stroke:none; }
.eyebrow .eyebrow-icon .ti-line{
  fill:none;
  stroke:var(--text,#111110);
  stroke-width:2.4;
  stroke-linecap:round;
  stroke-linejoin:round;
}
.eyebrow .eyebrow-icon .ti-lime{
  fill:none;
  stroke:var(--limed);
  stroke-width:2.4;
  stroke-linecap:round;
  stroke-linejoin:round;
}
/* Wide (centred) chapters: centre the icon above the centred label */
.chapter--wide .eyebrow .eyebrow-icon{ margin-left:auto; margin-right:auto; }
.chapter-h{
  font-family:'Domine',serif;
  font-size:clamp(38px,4.6vw,58px);
  font-weight:400;
  letter-spacing:-.035em;
  line-height:1.04;
  color:var(--text);
  margin:0 0 24px;
}
.chapter-h em{ font-style:normal; }
.chapter-p{
  font-size:17px;
  line-height:1.65;
  color:var(--t2);
  margin:0 0 12px;
}
.chapter-p--muted{ color:var(--t3); font-size:15px; }

/* Wide chapter — copy centred above a full-width stage band */
.chapter--wide{
  display:block;
}
.chapter--wide .chapter-copy{
  max-width:620px;
  margin:0 auto clamp(40px,6vh,56px);
  text-align:center;
}
.chapter--wide .eyebrow{ justify-content:center; }

/* ─────────── Stage (product visual frame) ─────────── */
.stage{
  aspect-ratio:1 / 1;
  background:var(--white);
  border-radius:28px;
  position:relative;
  overflow:hidden;
  border:1px solid var(--border);
  isolation:isolate;
}

/* ─────────── Aurora (shared) — a hint of lime light, never a wash ─────────── */
.aurora{
  position:absolute;
  inset:-20%;
  pointer-events:none;
  filter:blur(72px);
  z-index:0;
  opacity:.30;
}
.aurora-blob{ position:absolute; border-radius:50%; }
.aurora-blob.b1{ background:rgba(var(--g-lime), .16); width:46%; height:46%; top:8%;   left:-12%; }
.aurora-blob.b2{ background:rgba(var(--g-lime), .20); width:48%; height:48%; top:-12%; right:-12%; }
.aurora-blob.b3{ background:rgba(var(--g-lime), .30); width:54%; height:54%; bottom:-16%; right:-8%; }
.aurora-blob.b4{ background:rgba(var(--g-lime), .12); width:40%; height:40%; bottom:-12%; left:-12%; }

/* ─────────── Stage viewport + restart (shared) ─────────── */
.stage .viewport{
  position:absolute;
  inset:0;
  overflow:hidden;
  z-index:2;
  opacity:1;
  transition:opacity .4s ease;
}
.stage.fade-out .viewport{ opacity:0; }

.stage-restart{
  position:absolute;
  bottom:18px; right:18px;
  background:rgba(255,255,255,.75);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  border:1px solid var(--border);
  color:var(--t3);
  width:30px; height:30px;
  border-radius:50%;
  cursor:pointer;
  display:grid; place-items:center;
  z-index:10;
  transition:color .15s, border-color .15s;
}
.stage-restart:hover{ color:var(--text); border-color:var(--t2); }
.stage-restart svg{ width:12px; height:12px; }

/* ─────────── Scroll reveal (calm; no-JS keeps everything visible) ─────────── */
html.js .rv{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .9s cubic-bezier(.22,1,.36,1), transform .9s cubic-bezier(.22,1,.36,1);
}
html.js .rv.in{ opacity:1; transform:translateY(0); }
.rv-d1{ transition-delay:.08s; }
.rv-d2{ transition-delay:.16s; }
.rv-d3{ transition-delay:.24s; }

/* ═══════════════════════════════════════════════════════════════
   01 · COBERTURA TOTAL  (#feat-cov)
   Domain list scrolls, Trigonometria expands its competencies.
   ═══════════════════════════════════════════════════════════════ */
#feat-cov .stage .fade-top,
#feat-cov .stage .fade-bottom{
  position:absolute;
  left:0; right:0;
  height:80px;
  z-index:4;
  pointer-events:none;
}
#feat-cov .stage .fade-top{
  top:0;
  background:linear-gradient(to bottom, var(--white) 0%, rgba(255,255,255,.7) 50%, transparent 100%);
}
#feat-cov .stage .fade-bottom{
  bottom:0;
  background:linear-gradient(to top, var(--white) 0%, rgba(255,255,255,.7) 50%, transparent 100%);
}
#feat-cov .stage .viewport{
  left:28px; right:28px;
}
#feat-cov .cov-list{
  position:absolute;
  left:0; right:0;
  top:50%;
  display:flex;
  flex-direction:column;
  gap:10px;
  transform:translateY(0);
  transition:transform .9s cubic-bezier(.65,0,.35,1);
  will-change:transform;
}
#feat-cov .cov-list.fast{ transition:transform 1.6s cubic-bezier(.5,.1,.5,.9); }

#feat-cov .domain{
  background:var(--white);
  border:1px solid var(--border);
  border-radius:14px;
  padding:16px 18px;
  display:grid;
  grid-template-columns:38px 1fr;
  gap:14px;
  align-items:center;
  opacity:0;
  transform:translateX(60px);
  transition:
    opacity .5s cubic-bezier(.22,1,.36,1),
    transform .55s cubic-bezier(.22,1,.36,1),
    box-shadow .6s ease,
    border-color .6s ease,
    padding 1.4s cubic-bezier(.16,1,.3,1),
    row-gap 1.4s cubic-bezier(.16,1,.3,1),
    grid-template-rows 1.4s cubic-bezier(.16,1,.3,1);
  flex-shrink:0;
  position:relative;
  box-shadow:0 0 0 1px rgba(var(--g-lime), .14), 0 0 24px 2px rgba(var(--g-lime), .10);
}
#feat-cov .domain.in{ opacity:1; transform:translateX(0); }
#feat-cov .domain.has-expand{
  grid-template-rows:auto 0fr;
  align-content:start;
  row-gap:0;
}
#feat-cov .domain.has-expand .domain-icon,
#feat-cov .domain.has-expand .domain-body{
  grid-row:1;
  align-self:center;
}
#feat-cov .domain.has-expand .expand-wrap{ grid-row:2; }
#feat-cov .domain.has-expand.expanded{
  grid-template-rows:auto 1fr;
  row-gap:14px;
}
#feat-cov .domain-icon{
  width:38px; height:38px;
  border-radius:10px;
  background:var(--bg);
  border:1px solid var(--border);
  display:grid; place-items:center;
  color:var(--text);
}
#feat-cov .domain-icon svg{ width:18px; height:18px; stroke-width:1.7; }
#feat-cov .domain-body{ min-width:0; }
#feat-cov .domain-name{
  font-size:14.5px;
  font-weight:500;
  color:var(--text);
  line-height:1.25;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
#feat-cov .domain.active .domain-icon{
  background:var(--lime);
  border-color:var(--lime);
  color:var(--accent-ink);
}
#feat-cov .domain .expand-wrap{
  grid-column:1 / -1;
  overflow:hidden;
  opacity:0;
  min-height:0;
  transition:opacity .8s cubic-bezier(.22,1,.36,1) .15s;
}
#feat-cov .domain.expanded .expand-wrap{ opacity:1; }
#feat-cov .comp-grid{
  display:flex;
  flex-direction:column;
  gap:6px;
}
#feat-cov .comp{
  background:var(--white);
  border:1px solid var(--border);
  border-radius:10px;
  padding:10px 14px;
  display:flex;
  align-items:center;
  opacity:0;
  transition:opacity .6s cubic-bezier(.22,1,.36,1);
}
#feat-cov .domain.expanded .comp{ opacity:1; }
#feat-cov .comp-title{
  font-size:12px;
  font-weight:500;
  line-height:1.3;
  color:var(--text);
}
#feat-cov .stage .aurora{
  opacity:0;
  transition:opacity 1.4s ease;
}
#feat-cov .stage.aurora-on .aurora{ opacity:.28; }
#feat-cov .stage.aurora-bright .aurora{ opacity:.45; }

/* ═══════════════════════════════════════════════════════════════
   02 · COMO ENSINAMOS  (#feat-lab)
   Three concept cards slide through; a cursor drags the maths.
   ═══════════════════════════════════════════════════════════════ */
#feat-lab .card{
  position:absolute;
  width:88%;
  aspect-ratio:5 / 4;
  left:50%;
  top:50%;
  background:var(--white);
  border:1px solid var(--border);
  border-radius:18px;
  box-shadow:
    0 0 0 1px rgba(var(--g-lime), .15),
    0 0 30px 2px rgba(var(--g-lime), .12),
    0 14px 40px rgba(0,0,0,.06);
  transform:translate(120%, -50%);
  transition:transform 1.1s cubic-bezier(.65,0,.35,1);
  overflow:hidden;
  will-change:transform;
}
#feat-lab .card.in{ transform:translate(-50%, -50%); }
#feat-lab .card.out{ transform:translate(-220%, -50%); }

#feat-lab .canvas{ position:absolute; inset:28px; }
#feat-lab .canvas svg{ width:100%; height:100%; overflow:visible; }

#feat-lab .axis{ stroke:var(--border); stroke-width:1; }
#feat-lab .argand-axis{ stroke:var(--text); stroke-width:1.5; stroke-linecap:round; }
#feat-lab .grid-line{ stroke:var(--borderlt); stroke-width:1; }
#feat-lab .curve{ stroke:var(--text); stroke-width:2; fill:none; stroke-linecap:round; stroke-linejoin:round; }
#feat-lab .asym{ stroke:var(--t3); stroke-width:1; stroke-dasharray:4 4; fill:none; }
#feat-lab .guide{ stroke:var(--accent-deep); stroke-width:1; stroke-dasharray:3 3; fill:none; }
#feat-lab .tangent{ stroke:var(--accent-deep); stroke-width:2; stroke-linecap:round; fill:none; }
#feat-lab .vector{ stroke:var(--accent-deep); stroke-width:2; stroke-linecap:round; fill:none; }
#feat-lab .dot-target{ fill:var(--t3); }
#feat-lab .dot{ fill:var(--lime); stroke:var(--accent-deep); stroke-width:2; }

/* Entrance reveal — axes draw, curves draw, markers pop */
#feat-lab .reveal-line{
  stroke-dasharray:500;
  stroke-dashoffset:500;
}
#feat-lab .card.reveal .reveal-line{
  animation:labDraw 1.0s cubic-bezier(.4,0,.2,1) forwards;
}
@keyframes labDraw{
  to{ stroke-dashoffset:0; }
}
#feat-lab .reveal-curve{
  stroke-dasharray:900;
  stroke-dashoffset:900;
}
#feat-lab .card.reveal .reveal-curve{
  animation:labDraw 1.4s cubic-bezier(.4,0,.2,1) forwards;
  animation-delay:.6s;
}
#feat-lab .reveal-pop{
  opacity:0;
  transform-box:fill-box;
  transform-origin:center;
  transform:scale(.4);
}
#feat-lab .card.reveal .reveal-pop{
  animation:labPop .5s cubic-bezier(.34,1.56,.64,1) 1.8s forwards;
}
@keyframes labPop{
  to{ opacity:1; transform:scale(1); }
}
#feat-lab .reveal-fade{ opacity:0; }
#feat-lab .card.reveal .reveal-fade{
  animation:labFadeIn .5s cubic-bezier(.4,0,.2,1) 1.8s forwards;
}
@keyframes labFadeIn{
  to{ opacity:1; }
}
#feat-lab .reveal-tangent{
  opacity:0;
  transform-box:fill-box;
  transform-origin:center;
  transform:scaleX(0);
}
#feat-lab .card.reveal .reveal-tangent{
  animation:labDrawTangent .5s cubic-bezier(.34,1.56,.64,1) forwards;
  animation-delay:1.1s;
}
@keyframes labDrawTangent{
  to{ opacity:1; transform:scaleX(1); }
}
#feat-lab .reveal-vector{
  stroke-dasharray:200;
  stroke-dashoffset:200;
}
#feat-lab .card.reveal .reveal-vector{
  animation:labDraw .5s cubic-bezier(.4,0,.2,1) forwards;
  animation-delay:1.1s;
}

/* Cursor — same SVG + same offset-path as the dot, can never drift */
#feat-lab .svg-cursor{
  opacity:0;
  transition:opacity .35s ease;
  filter:drop-shadow(0 1px 1.5px rgba(0,0,0,.18));
}
#feat-lab .svg-cursor .cursor-shape{
  transform-origin:0 0;
  transform:scale(1);
  transition:transform .35s cubic-bezier(.34,1.56,.64,1);
}
#feat-lab .card.cursor-in .svg-cursor{ opacity:1; }
#feat-lab .card.out .svg-cursor{ opacity:0; transition-delay:0s; }
#feat-lab .card.pinched .svg-cursor .cursor-shape{
  animation:vPinchPress .32s cubic-bezier(.5,0,.25,1) forwards;
}
#feat-lab .card.dragging:not(.pinched) .svg-cursor .cursor-shape{
  animation:vPinchRelease .45s cubic-bezier(.34,1.56,.64,1) forwards;
}
@keyframes vPinchPress{
  0%{ transform:scale(1); }
  25%{ transform:scale(1.06); }
  100%{ transform:scale(.74); }
}
@keyframes vPinchRelease{
  0%{ transform:scale(.74); }
  60%{ transform:scale(1.06); }
  100%{ transform:scale(1); }
}
#feat-lab .c3-cursor-shape{ transform-origin:290px 150px !important; }

/* Card 1: limit — dot rides the curve toward the asymptote */
#feat-lab .limit-dot{
  offset-path:path('M 30 240 Q 100 200, 180 130 T 380 75');
  offset-distance:0%;
}
#feat-lab .limit-guide-v{
  offset-path:path('M 30 240 Q 100 200, 180 130 T 380 75');
  offset-distance:0%;
  offset-anchor:0% 0%;
  offset-rotate:0deg;
}
#feat-lab .c1-cursor{
  offset-path:path('M 30 240 Q 100 200, 180 130 T 380 75');
  offset-distance:35%;
  offset-anchor:0% 0%;
  offset-rotate:0deg;
  transition:offset-distance .75s cubic-bezier(.2,.8,.25,1);
}
#feat-lab .card.c1.cursor-in .c1-cursor{ offset-distance:0%; }
#feat-lab .card.c1.dragging .limit-dot,
#feat-lab .card.c1.dragging .c1-cursor{
  animation:labC1Drag 3.4s cubic-bezier(.32,0,.15,1) forwards;
  transition:none;
}
#feat-lab .card.c1.dragging .limit-guide-v{
  animation:labC1Drag 3.4s cubic-bezier(.32,0,.15,1) forwards;
}
@keyframes labC1Drag{
  0%{ offset-distance:0%; opacity:1; }
  100%{ offset-distance:100%; opacity:1; }
}

/* Card 2: derivative — tangent slides to the peak */
#feat-lab .deriv-dot{
  offset-path:path('M 30 220 C 120 220, 140 60, 200 60 S 280 220, 370 220');
  offset-rotate:auto;
  offset-distance:0%;
}
#feat-lab .c2-cursor{
  offset-path:path('M 30 220 C 120 220, 140 60, 200 60 S 280 220, 370 220');
  offset-distance:30%;
  offset-anchor:0% 0%;
  offset-rotate:0deg;
  transition:offset-distance .75s cubic-bezier(.2,.8,.25,1);
}
#feat-lab .card.c2.cursor-in .c2-cursor{ offset-distance:0%; }
#feat-lab .card.c2.dragging .deriv-dot,
#feat-lab .card.c2.dragging .c2-cursor{
  animation:labC2Drag 3.2s cubic-bezier(.32,0,.15,1) forwards;
  transition:none;
}
@keyframes labC2Drag{
  0%{ offset-distance:0%; opacity:1; }
  78%{ offset-distance:52%; opacity:1; animation-timing-function:cubic-bezier(.4,0,.3,1); }
  100%{ offset-distance:50%; opacity:1; }
}

/* Card 3: Argand — vector + cursor orbit together */
#feat-lab .argand-vector{
  transform-origin:200px 150px;
  transform:rotate(0deg) scale(1);
}
#feat-lab .argand-trail{
  fill:none;
  stroke:var(--t3);
  stroke-width:1;
  stroke-dasharray:4 4;
}
#feat-lab .angle-arc{
  fill:none;
  stroke:var(--accent-deep);
  stroke-width:2;
  stroke-linecap:round;
  stroke-dasharray:63;
  stroke-dashoffset:63;
}
#feat-lab .c3-cursor{ transform-origin:290px 150px; }
#feat-lab .card.c3.dragging .argand-vector{
  animation:labC3Vector 3.2s cubic-bezier(.32,0,.15,1) forwards;
}
#feat-lab .card.c3.dragging .c3-cursor{
  animation:labC3Counter 3.2s cubic-bezier(.32,0,.15,1) forwards;
}
#feat-lab .card.c3.dragging .angle-arc{
  animation:labC3Arc 3.2s cubic-bezier(.32,0,.15,1) forwards;
}
@keyframes labC3Vector{
  0%{ transform:rotate(0deg); opacity:1; }
  100%{ transform:rotate(120deg); opacity:1; }
}
@keyframes labC3Counter{
  0%{ transform:rotate(0deg); }
  100%{ transform:rotate(-120deg); }
}
@keyframes labC3Arc{
  0%{ stroke-dashoffset:63; }
  100%{ stroke-dashoffset:0; }
}

/* Success — answer pulses lime, check badge appears */
@keyframes vSuccessPulse{
  0%{ transform:scale(1); filter:drop-shadow(0 0 0 rgba(var(--g-lime), 0)); }
  40%{ transform:scale(1.6); filter:drop-shadow(0 0 8px rgba(var(--g-lime), .9)); }
  100%{ transform:scale(1.15); filter:drop-shadow(0 0 14px rgba(var(--g-lime), .55)); }
}
#feat-lab .card.c1.solved .dot-target{
  fill:var(--accent-deep);
  transform-box:fill-box;
  transform-origin:center;
  animation:vSuccessPulse .7s cubic-bezier(.34,1.56,.64,1) forwards;
}
#feat-lab .card.c2.solved .deriv-dot .dot{
  transform-box:fill-box;
  transform-origin:center;
  animation:vSuccessPulse .7s cubic-bezier(.34,1.56,.64,1) forwards;
}
#feat-lab .card.c2.solved .tangent{
  stroke:var(--accent-deep);
  stroke-width:3;
  transition:stroke-width .4s ease, stroke .4s ease;
}
#feat-lab .card.c3.solved .argand-trail{
  stroke:var(--accent-deep);
  stroke-width:1.5;
  transition:stroke .5s ease, stroke-width .5s ease;
}
#feat-lab .card.c3.solved .argand-vector .dot{
  transform-box:fill-box;
  transform-origin:center;
  animation:vSuccessPulse .7s cubic-bezier(.34,1.56,.64,1) forwards;
}
#feat-lab .check-badge{
  position:absolute;
  width:28px; height:28px;
  border-radius:50%;
  background:var(--lime);
  display:grid;
  place-items:center;
  opacity:0;
  transform:scale(.4);
  transition:opacity .4s ease, transform .5s cubic-bezier(.34,1.56,.64,1);
  z-index:6;
  box-shadow:0 4px 12px rgba(var(--g-lime), .4);
}
#feat-lab .card.c1 .check-badge{ top:22%; right:8%; }
#feat-lab .card.c2 .check-badge{ top:14%; left:58%; }
#feat-lab .card.c3 .check-badge{ bottom:12%; left:18%; }
#feat-lab .check-badge svg{
  width:16px; height:16px;
  stroke:var(--accent-ink);
  stroke-width:3;
  fill:none;
  stroke-linecap:round;
  stroke-linejoin:round;
}
#feat-lab .card.solved .check-badge{
  opacity:1;
  transform:scale(1);
  transition-delay:.1s;
}

/* ═══════════════════════════════════════════════════════════════
   03 · TUTOR IA  (#feat-ai)
   Question typed close-up, camera pulls back, answer morphs in.
   ═══════════════════════════════════════════════════════════════ */
#feat-ai .stage.resetting,
#feat-ai .stage.resetting *,
#feat-ai .stage.resetting *::before,
#feat-ai .stage.resetting *::after{
  transition:none !important;
  animation:none !important;
}
/* Initial: input zoomed to 1.7×, positioned so its LEFT EDGE sits at the
   stage's horizontal center. Camera pulls back in one motion to the resting
   scale as the user types. */
#feat-ai .scene{
  position:absolute;
  left:50%;
  top:50%;
  width:560px;
  transform-origin:center center;
  transform:translate(35%, -50%) scale(1.7);
  filter:blur(7px);
  transition:transform 1.0s cubic-bezier(.22,1,.36,1), filter .7s ease;
}
#feat-ai .stage.s-focus .scene{
  filter:blur(0);
  transform:translate(35%, -50%) scale(1.7);
}
#feat-ai .stage.s-typing .scene{
  filter:blur(0);
  transform:translate(-50%, -25%) scale(.68);
  transition:transform 2.5s cubic-bezier(.4,0,.2,1), filter .7s ease;
}
#feat-ai .stage.s-sending .scene{
  filter:blur(0);
  transform:translate(-50%, -25%) scale(.68);
  transition:transform .4s cubic-bezier(.4,0,.2,1);
}
#feat-ai .stage.s-response .scene{
  filter:blur(0);
  transform:translate(-50%, -50%) scale(.68);
  transition:transform .8s cubic-bezier(.22,1,.36,1);
}

#feat-ai .prompt-card{
  background:var(--white);
  border:1.5px solid var(--border);
  border-radius:18px;
  padding:22px 24px 14px;
  position:relative;
  transition:border-color .5s ease, box-shadow .7s ease;
  box-shadow:0 4px 24px rgba(14,14,12,.04);
}
#feat-ai .stage.s-focus .prompt-card,
#feat-ai .stage.s-typing .prompt-card{
  box-shadow:
    0 0 0 1px rgba(var(--g-lime), .40),
    0 0 30px 2px rgba(var(--g-lime), .22),
    0 0 70px 8px rgba(var(--g-lime), .13),
    0 4px 24px rgba(14,14,12,.04);
  border-color:rgba(var(--g-lime), .35);
}
#feat-ai .stage.s-response .prompt-card{
  box-shadow:0 4px 16px rgba(14,14,12,.03);
  border-color:var(--border);
}
#feat-ai .prompt-text{
  min-height:50px;
  font-size:17px;
  line-height:1.45;
  color:var(--text);
  margin-bottom:12px;
  max-height:200px;
  overflow:hidden;
  opacity:1;
  transition:max-height .6s cubic-bezier(.4,0,.2,1), opacity .4s ease,
             margin-bottom .6s cubic-bezier(.4,0,.2,1), min-height .6s cubic-bezier(.4,0,.2,1);
}
#feat-ai .stage.s-response .prompt-text{
  max-height:0;
  min-height:0;
  opacity:0;
  margin-bottom:0;
}
#feat-ai .prompt-text .placeholder{ color:var(--t3); }
#feat-ai .stage.s-typing .prompt-text .placeholder,
#feat-ai .stage.s-sending .prompt-text .placeholder,
#feat-ai .stage.s-response .prompt-text .placeholder{ display:none; }
#feat-ai .caret{
  display:inline-block;
  width:1.5px;
  height:18px;
  background:var(--text);
  margin-left:1px;
  vertical-align:text-bottom;
  animation:aiBlink 1s steps(2,start) infinite;
}
@keyframes aiBlink{ 50%{ opacity:0; } }
#feat-ai .stage.s-sending .caret,
#feat-ai .stage.s-response .caret{ display:none; }

#feat-ai .prompt-toolbar{
  display:flex;
  align-items:center;
  gap:14px;
  color:var(--t3);
  font-size:13px;
  font-weight:500;
  max-height:60px;
  opacity:1;
  transition:max-height .6s cubic-bezier(.4,0,.2,1), opacity .4s ease;
}
#feat-ai .stage.s-response .prompt-toolbar{
  max-height:0;
  opacity:0;
}
#feat-ai .send-btn{
  margin-left:auto;
  width:32px; height:32px;
  border-radius:50%;
  background:var(--t2);
  display:grid;
  place-items:center;
  color:#fff;
  opacity:.5;
  transition:background .3s ease, opacity .3s ease, transform .3s ease;
  position:relative;
}
#feat-ai .send-btn svg{
  width:14px; height:14px;
  stroke:#fff;
  stroke-width:2.4;
  fill:none;
  stroke-linecap:round;
  stroke-linejoin:round;
}
#feat-ai .stage.s-typing .send-btn{
  background:var(--text);
  opacity:1;
}
#feat-ai .stage.s-sending .send-btn{
  background:var(--accent-deep);
  opacity:1;
  animation:aiSendKick .5s cubic-bezier(.34,1.56,.64,1);
}
@keyframes aiSendKick{
  0%{ transform:scale(1); }
  50%{ transform:scale(1.18); }
  100%{ transform:scale(1); }
}

/* Inline AI response — expands inside the same card (0fr → 1fr) */
#feat-ai .ai-response-inline{
  display:grid;
  grid-template-rows:0fr;
  transition:grid-template-rows .8s cubic-bezier(.22,1,.36,1);
  overflow:hidden;
}
#feat-ai .ai-response-inline > .inline-wrap{
  min-height:0;
  overflow:hidden;
}
#feat-ai .stage.s-response .ai-response-inline{ grid-template-rows:1fr; }

#feat-ai .ai-title{
  font-size:14px;
  font-weight:600;
  color:var(--text);
  margin-bottom:22px;
  display:flex;
  align-items:center;
  gap:8px;
  opacity:0;
  transform:translateY(6px);
  transition:opacity .4s ease .3s, transform .4s ease .3s;
}
#feat-ai .stage.s-response .ai-title{
  opacity:1;
  transform:translateY(0);
}
#feat-ai .ai-title::before{
  content:'';
  width:8px; height:8px;
  border-radius:50%;
  background:var(--accent-deep);
}
#feat-ai .ai-step{
  margin-bottom:22px;
  opacity:0;
  transform:translateY(10px);
  transition:opacity .55s cubic-bezier(.22,1,.36,1), transform .55s cubic-bezier(.22,1,.36,1);
}
#feat-ai .ai-step:last-child{ margin-bottom:0; }
#feat-ai .stage.s-response .ai-step-1{ transition-delay:.6s; }
#feat-ai .stage.s-response .ai-step-2{ transition-delay:1.1s; }
#feat-ai .stage.s-response .ai-step-3{ transition-delay:1.6s; }
#feat-ai .stage.s-response .ai-step{
  opacity:1;
  transform:translateY(0);
}
#feat-ai .ai-step-label{
  font-size:11px;
  font-weight:500;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--t3);
  margin-bottom:12px;
}

/* Step 1: nested boxes */
#feat-ai .nested-boxes{
  display:flex;
  align-items:center;
  justify-content:center;
  padding:8px 0;
  font-family:'Domine',serif;
  font-size:32px;
  font-weight:500;
  color:var(--text);
  line-height:1;
}
#feat-ai .nested-boxes .paren{
  color:var(--t3);
  font-weight:300;
  margin:0 2px;
}
#feat-ai .box{
  display:inline-flex;
  align-items:center;
  border-radius:10px;
  padding:6px 10px;
}
#feat-ai .box-outer{
  background:rgba(var(--g-lime), .10);
  box-shadow:inset 0 0 0 1.5px rgba(var(--g-lime), .5);
  color:var(--accent-ink);
}
#feat-ai .box-inner{
  background:rgba(var(--g-lime), .22);
  box-shadow:inset 0 0 0 1.5px rgba(var(--g-lime), .7);
  color:var(--accent-ink);
  margin:0 2px;
  padding:4px 8px;
  font-size:26px;
  font-weight:500;
}

/* Step 2: the rule */
#feat-ai .rule-eq{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:14px;
  padding:4px 0;
}
#feat-ai .eq-part{
  background:var(--borderlt);
  border:1px solid var(--border);
  border-radius:8px;
  padding:9px 14px;
  font-size:13px;
  font-weight:500;
  color:var(--text);
}
#feat-ai .eq-times{
  font-family:'Domine',serif;
  font-size:22px;
  color:var(--accent-deep);
  font-weight:500;
}

/* Step 3: worked example */
#feat-ai .example{
  background:var(--borderlt);
  border-radius:12px;
  padding:18px 20px;
  display:flex;
  justify-content:center;
}
#feat-ai .ex-line{
  display:flex;
  align-items:flex-start;
  gap:8px;
  font-family:'Domine',serif;
  font-size:22px;
  color:var(--text);
}
#feat-ai .ex-fn{ font-weight:500; }
#feat-ai .ex-prime{
  font-weight:500;
  font-size:18px;
  vertical-align:super;
  margin-left:-4px;
}
#feat-ai .ex-eq{ font-weight:300; color:var(--t3); }
#feat-ai .ex-mul{ font-weight:500; color:var(--t3); }
#feat-ai .ex-piece{
  padding:4px 8px;
  border-radius:7px;
  font-weight:500;
}
#feat-ai .ex-outer{
  background:rgba(var(--g-lime), .10);
  box-shadow:inset 0 0 0 1.5px rgba(var(--g-lime), .5);
}
#feat-ai .ex-inner{
  background:rgba(var(--g-lime), .22);
  box-shadow:inset 0 0 0 1.5px rgba(var(--g-lime), .7);
}
#feat-ai .ex-line .paren{ color:var(--t3); font-weight:300; }
#feat-ai .ex-stack{
  display:inline-flex;
  flex-direction:column;
  align-items:center;
  gap:8px;
}
#feat-ai .ex-tag{
  font-size:10px;
  font-weight:500;
  letter-spacing:.06em;
  text-transform:uppercase;
  color:var(--t3);
  position:relative;
}
#feat-ai .ex-tag::before{
  content:'';
  position:absolute;
  top:-6px;
  left:50%;
  transform:translateX(-50%);
  width:1px; height:4px;
  background:var(--t3);
  opacity:.5;
}

/* Cursor (DOM) — appears to click send */
#feat-ai .cursor{
  position:absolute;
  width:22px; height:22px;
  pointer-events:none;
  z-index:10;
  opacity:0;
  transition:opacity .35s ease, left .85s cubic-bezier(.2,.8,.25,1), top .85s cubic-bezier(.2,.8,.25,1);
  filter:drop-shadow(0 1px 1.5px rgba(0,0,0,.22));
  left:65%; top:35%;
}
#feat-ai .cursor-shape{
  width:100%; height:100%;
  transform-origin:30% 30%;
  transition:transform .32s cubic-bezier(.5,0,.25,1);
}
#feat-ai .cursor-shape svg{ width:100%; height:100%; }
#feat-ai .stage.s-sending .cursor{
  opacity:1;
  left:calc(100% - 38px);
  top:calc(100% - 38px);
}
#feat-ai .stage.s-sending .cursor .cursor-shape{
  animation:vPinchPress .32s cubic-bezier(.5,0,.25,1);
}
#feat-ai .stage.s-response .cursor{ opacity:0; }

/* ═══════════════════════════════════════════════════════════════
   06 · PROGRESSO  (#feat-prog)
   KPI cards + domain cards reveal in a stagger; bars fill and
   numbers count up. Plays when visible, loops. Same motion
   vocabulary as the other stages.
   ═══════════════════════════════════════════════════════════════ */
#feat-prog .stage .aurora{
  opacity:0;
  transition:opacity 1.4s ease;
}
#feat-prog .stage.playing .aurora{ opacity:.30; }

/* Whole frame fades on loop restart */
#feat-prog .prog-frame{
  transition:opacity .55s ease;
}
#feat-prog .stage.fade-out .prog-frame{ opacity:0; }

/* Cards start hidden; JS adds .in to reveal them one by one */
#feat-prog .vprog-kpi-card,
#feat-prog .vprog-domain-card{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .6s cubic-bezier(.22,1,.36,1),
             transform .6s cubic-bezier(.22,1,.36,1);
  will-change:opacity, transform;
}
#feat-prog .vprog-kpi-card.in,
#feat-prog .vprog-domain-card.in{
  opacity:1;
  transform:translateY(0);
}

/* Section head reveals with the same fade */
#feat-prog .vprog-section-head{
  opacity:0;
  transform:translateY(10px);
  transition:opacity .6s cubic-bezier(.22,1,.36,1),
             transform .6s cubic-bezier(.22,1,.36,1);
}
#feat-prog .vprog-section-head.in{
  opacity:1;
  transform:translateY(0);
}

/* Bars grow from 0 to their target width (JS drives the width) */
#feat-prog .vprog-bar-fill{
  width:0;
  transition:width 1.05s cubic-bezier(.22,1,.36,1);
}

/* ═══════════════════════════════════════════════════════════════
   Responsive
   ═══════════════════════════════════════════════════════════════ */
@media (max-width:960px){
  .chapter{
    grid-template-columns:1fr;
    padding:clamp(48px,7vh,70px) 24px;
    gap:44px;
  }
  .chapter--flip .chapter-copy{ order:1; justify-self:start; }
  .chapter--flip .chapter-stage-wrap{ order:2; }
  .chapter-h{ font-size:clamp(34px,8vw,42px); }
  .chapter-p{ font-size:15px; }
  .chapter-stage-wrap{ max-width:560px; width:100%; margin:0 auto; }
  #feat-ai .scene{ width:460px; }
}

@media (prefers-reduced-motion:reduce){
  .rv{ opacity:1; transform:none; transition:none; }
  #feat-cov .stage *, #feat-lab .stage *, #feat-ai .stage *,
  #feat-prog .stage *{
    animation-duration:.01s !important;
    transition-duration:.01s !important;
  }
  /* Progresso: show the final state (JS sets each bar's target width) */
  #feat-prog .stage .aurora{ opacity:.30; }
  #feat-prog .vprog-kpi-card,
  #feat-prog .vprog-domain-card,
  #feat-prog .vprog-section-head{ opacity:1; transform:none; }
}

/* ═══════════════════════════════════════════════════════════
   FAQ — plain-text answers for AI answer engines + long-tail SEO.
   Paper/lime system: Domine heading, DM Sans body, lime accent rule.
   ═══════════════════════════════════════════════════════════ */
.faq{ padding:clamp(80px,12vh,140px) 40px; background:var(--bg); }
.faq-wrap{ max-width:760px; margin:0 auto; }
.faq-title{
  font-family:'Domine',serif; font-weight:600;
  font-size:clamp(30px,4.4vw,46px); line-height:1.05; letter-spacing:-.8px;
  color:var(--text); margin:0 0 clamp(28px,4vh,44px);
}
.faq-title em{ font-style:italic; color:var(--limed); }
.faq-item{
  border-top:1px solid var(--border);
  padding:0;
}
.faq-item:last-child{ border-bottom:1px solid var(--border); }
.faq-item summary{
  list-style:none; cursor:pointer;
  display:flex; align-items:center; justify-content:space-between; gap:20px;
  padding:22px 4px; font-family:'DM Sans',sans-serif;
  font-size:clamp(17px,2vw,19px); font-weight:600; color:var(--text);
  transition:color .18s ease;
}
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary:hover{ color:var(--limed); }
.faq-item summary::after{
  content:""; flex:0 0 auto; width:12px; height:12px;
  border-right:2px solid var(--t3); border-bottom:2px solid var(--t3);
  transform:rotate(45deg); transition:transform .22s ease, border-color .18s ease;
}
.faq-item[open] summary::after{ transform:rotate(-135deg); border-color:var(--limed); }
.faq-a{ padding:0 4px 24px; }
.faq-a p{
  margin:0; font-family:'DM Sans',sans-serif;
  font-size:16.5px; line-height:1.6; color:var(--t2); max-width:64ch;
}
.faq-a a{ color:var(--limed); text-decoration:underline; text-underline-offset:2px; }