/* =========================================================================
   Revisa que Passa — E-book "O Código do Aprendizado"
   Extends styles.css (same tokens). Adds the 3D flip-book + sales layout.
   Direction: kinetic dark editorial, warm "study by the fire" accent.
   ========================================================================= */

:root {
  --ember: #f5a524;     /* warm accent borrowed from the cover */
  --ember-deep: #d4831a;
  --paper: #efe9dd;
}

/* ---------- e-book hero ---------- */
.ebk-hero {
  position: relative;
  padding: calc(var(--space-section) * 0.7) 0 var(--space-section);
  background:
    radial-gradient(1100px 540px at 78% 8%, rgba(245, 165, 36, 0.16), transparent 60%),
    radial-gradient(900px 520px at 8% 30%, rgba(91, 78, 230, 0.22), transparent 62%),
    var(--ink-950);
  overflow: hidden;
}
.ebk-hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: clamp(2rem, 1rem + 4vw, 5rem);
  align-items: center;
}
@media (max-width: 920px) { .ebk-hero__grid { grid-template-columns: 1fr; gap: 3rem; } }

.ebk-kicker {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-display); font-weight: 600;
  font-size: 0.82rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ember); margin-bottom: 1.1rem;
  padding: 0.4rem 0.9rem; border-radius: 999px;
  border: 1px solid rgba(245, 165, 36, 0.28); background: rgba(245, 165, 36, 0.06);
}
.ebk-hero h1 {
  color: var(--text-inv);
  font-size: clamp(2.5rem, 1rem + 6.2vw, 5.2rem);
  letter-spacing: -0.035em;
}
.ebk-hero h1 .grad {
  background: linear-gradient(108deg, var(--ember), var(--indigo-bright));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.ebk-hero__lead {
  color: var(--text-inv-soft); font-size: var(--text-lead);
  margin: 1.4rem 0 1.8rem; max-width: 36ch;
}
.ebk-hero__meta {
  display: flex; flex-wrap: wrap; gap: 1.3rem 2rem; align-items: center;
  color: var(--text-inv-mut); font-size: 0.9rem; margin-top: 1.8rem;
}
.ebk-hero__meta b { color: var(--text-inv); }
.ebk-price-tag {
  display: inline-flex; align-items: baseline; gap: 0.5rem;
  font-family: var(--font-display);
}
.ebk-price-tag .from { color: var(--text-inv-mut); text-decoration: line-through; font-size: 1rem; }
.ebk-price-tag .now { color: var(--text-inv); font-size: 2.1rem; font-weight: 700; letter-spacing: -0.03em; }
.ebk-price-tag .unit { color: var(--text-inv-mut); font-size: 0.9rem; }

.ebk-cta-row { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 0.4rem; }
.btn-ember {
  background: linear-gradient(110deg, var(--ember), var(--ember-deep));
  color: #2a1c05; box-shadow: 0 16px 38px -12px rgba(245, 165, 36, 0.6);
}
.btn-ember:hover { transform: translateY(-3px); box-shadow: 0 24px 50px -14px rgba(245, 165, 36, 0.7); }
.nav__buy { white-space: nowrap; }
@media (max-width: 480px) { .nav__buy { padding: 0.7rem 1.2rem; font-size: 0.92rem; } }

/* ---------- 3D flip-book ---------- */
.flip-wrap { perspective: 2400px; display: grid; place-items: center; }
.flip-stage {
  position: relative;
  width: min(92%, 560px);
  aspect-ratio: 1.414 / 1;            /* two-page spread */
  transform-style: preserve-3d;
  transform: rotateX(8deg) rotateZ(-0.4deg);
  filter: drop-shadow(0 40px 60px rgba(0, 0, 0, 0.55));
}
.flip-spine {
  position: absolute; top: 0; bottom: 0; left: 50%; width: 2px;
  transform: translateX(-1px);
  background: linear-gradient(180deg, rgba(0,0,0,0), rgba(0,0,0,0.45), rgba(0,0,0,0));
  z-index: 999;
}
.leaf {
  position: absolute; top: 0; left: 50%;
  width: 50%; height: 100%;
  transform-origin: left center;
  transform-style: preserve-3d;
  transition: transform 1100ms var(--ease);
  cursor: grab;
}
.leaf.flipped { transform: rotateY(-180deg); }
.leaf__face {
  position: absolute; inset: 0;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  background-size: cover; background-position: center; background-color: #100e22;
  overflow: hidden;
}
.leaf__face--front { border-radius: 0 6px 6px 0; box-shadow: inset 0 0 60px rgba(0,0,0,0.06); }
.leaf__face--back  { transform: rotateY(180deg); border-radius: 6px 0 0 6px; }
/* page-edge gradient near the spine for depth */
.leaf__face--front::after,
.leaf__face--back::after {
  content: ""; position: absolute; top: 0; bottom: 0; width: 26px; pointer-events: none;
}
.leaf__face--front::after { left: 0; background: linear-gradient(90deg, rgba(0,0,0,0.22), transparent); }
.leaf__face--back::after { right: 0; background: linear-gradient(270deg, rgba(0,0,0,0.22), transparent); }

.flip-controls { display: flex; align-items: center; justify-content: center; gap: 0.8rem; margin-top: 1.6rem; }
.flip-btn {
  width: 48px; height: 48px; border-radius: 50%; cursor: pointer;
  border: 1px solid var(--line); background: rgba(255,255,255,0.04); color: var(--text-inv);
  font-size: 1.2rem; display: grid; place-items: center;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.flip-btn:hover { transform: translateY(-2px); background: rgba(245,165,36,0.14); border-color: rgba(245,165,36,0.4); }
.flip-btn:disabled { opacity: 0.35; cursor: not-allowed; transform: none; }
.flip-progress { font-family: var(--font-display); font-size: 0.85rem; color: var(--text-inv-mut); min-width: 92px; text-align: center; }
.flip-progress b { color: var(--text-inv); }
.flip-live {
  display: inline-flex; align-items: center; gap: 0.45rem; cursor: pointer;
  font-family: var(--font-display); font-size: 0.82rem; color: var(--text-inv-soft);
  background: none; border: 0; padding: 0.4rem 0.6rem;
}
.flip-live .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--emerald); box-shadow: 0 0 0 0 rgba(16,185,129,0.6); }
.flip-live.playing .dot { animation: pulse 1.6s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(16,185,129,0.5);} 70% { box-shadow: 0 0 0 8px rgba(16,185,129,0);} 100%{ box-shadow:0 0 0 0 rgba(16,185,129,0);} }

/* ---------- light content sections ---------- */
.ebk-section { background: var(--surface); color: var(--text); padding: var(--space-section) 0; }
.ebk-section--soft { background: var(--surface-soft); }
.ebk-eyebrow {
  font-family: var(--font-display); font-weight: 600; font-size: 0.8rem;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--indigo);
}
.ebk-section h2 { font-size: var(--text-h2); margin: 0.7rem 0 1rem; max-width: 18ch; }
.ebk-section .lead { color: var(--text-soft); font-size: var(--text-lead); max-width: 56ch; }

/* chapters / benefits grid (bento, not uniform) */
.chap-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 3rem; }
@media (max-width: 860px) { .chap-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .chap-grid { grid-template-columns: 1fr; } }
.chap {
  position: relative; padding: 1.6rem 1.5rem; border-radius: var(--radius);
  background: #fff; border: 1px solid #ece8fa;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.chap:hover { transform: translateY(-4px); box-shadow: 0 22px 48px -24px rgba(91,78,230,0.4); border-color: #d9d2f6; }
.chap__n {
  font-family: var(--font-display); font-weight: 700; font-size: 1rem;
  width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  color: #fff; background: linear-gradient(135deg, var(--indigo), var(--violet)); margin-bottom: 1rem;
}
.chap h3 { font-size: 1.18rem; letter-spacing: -0.02em; margin-bottom: 0.45rem; }
.chap p { color: var(--text-soft); font-size: 0.96rem; }
.chap--wide { grid-column: span 2; background: linear-gradient(135deg, #0b0a18, #1a1733); color: var(--text-inv); border-color: transparent; }
@media (max-width: 560px) { .chap--wide { grid-column: span 1; } }
.chap--wide h3 { color: #fff; } .chap--wide p { color: var(--text-inv-soft); }
.chap--wide .chap__n { background: linear-gradient(135deg, var(--ember), var(--ember-deep)); color: #2a1c05; }

/* author strip */
.ebk-author { display: grid; grid-template-columns: 200px 1fr; gap: 2.2rem; align-items: center; }
@media (max-width: 680px) { .ebk-author { grid-template-columns: 1fr; text-align: center; } }
.ebk-author__photo {
  border-radius: 24px; overflow: hidden; aspect-ratio: 1; background: #100e22;
  box-shadow: 0 0 0 1px var(--line), 0 30px 60px -30px var(--glow);
}
.ebk-author__photo img { width: 100%; height: 100%; object-fit: cover; }
.ebk-author blockquote { font-size: 1.25rem; line-height: 1.5; font-family: var(--font-display); letter-spacing: -0.02em; margin: 0 0 1rem; }
.ebk-author cite { color: var(--text-mut); font-style: normal; font-size: 0.95rem; }

/* ---------- buy / pricing block ---------- */
.ebk-buy { background: var(--ink-950); color: var(--text-inv); padding: var(--space-section) 0; }
.ebk-buy__card {
  max-width: 640px; margin: 0 auto; border-radius: var(--radius-xl);
  background: linear-gradient(160deg, #16132e, #0b0a18);
  border: 1px solid var(--line); padding: clamp(1.8rem, 1rem + 3vw, 3rem); text-align: center;
  box-shadow: 0 40px 80px -40px rgba(0,0,0,0.7);
}
.ebk-buy__price { display: flex; align-items: baseline; justify-content: center; gap: 0.6rem; margin: 0.6rem 0 0.3rem; }
.ebk-buy__price .now { font-family: var(--font-display); font-weight: 700; font-size: clamp(3rem, 1rem + 7vw, 4.6rem); letter-spacing: -0.04em; }
.ebk-buy__price .from { color: var(--text-inv-mut); text-decoration: line-through; font-size: 1.2rem; }
.ebk-buy__once { color: var(--ember); font-family: var(--font-display); font-weight: 600; letter-spacing: 0.04em; }
.ebk-buy ul { list-style: none; padding: 0; margin: 1.8rem auto; max-width: 380px; text-align: left; display: grid; gap: 0.7rem; }
.ebk-buy li { display: flex; gap: 0.7rem; color: var(--text-inv-soft); font-size: 1rem; }
.ebk-buy li::before { content: "✓"; color: var(--emerald); font-weight: 700; }
.ebk-buy .note { color: var(--text-inv-mut); font-size: 0.85rem; margin-top: 1rem; }

/* FAQ */
.faq { max-width: 760px; margin: 2.6rem auto 0; display: grid; gap: 0.7rem; }
.faq details {
  border: 1px solid #ece8fa; border-radius: var(--radius); background: #fff; padding: 0 1.3rem;
  transition: border-color var(--dur) var(--ease);
}
.faq details[open] { border-color: #d9d2f6; }
.faq details { color: var(--text); }
.faq summary {
  cursor: pointer; list-style: none; padding: 1.15rem 0; font-family: var(--font-display);
  font-weight: 700; font-size: 1.05rem; color: var(--text);
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.faq summary:hover { color: var(--indigo); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--indigo); font-size: 1.4rem; transition: transform var(--dur) var(--ease); }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq p { color: var(--text-soft); padding: 0 0 1.2rem; }

/* ---------- hero cover (opens the flip-book) ---------- */
.ebk-cover-col { display: grid; justify-items: center; gap: 1rem; }
.ebk-cover {
  position: relative; border: 0; padding: 0; background: none; cursor: pointer;
  width: min(78%, 360px); border-radius: 10px;
  transform: perspective(1400px) rotateY(-13deg) rotateX(3deg); transform-style: preserve-3d;
  transition: transform 600ms var(--ease), filter 600ms var(--ease);
  filter: drop-shadow(28px 34px 50px rgba(0, 0, 0, 0.6));
}
.ebk-cover img { width: 100%; border-radius: 10px; display: block; }
/* book spine + page edges */
.ebk-cover::before {
  content: ""; position: absolute; top: 0; bottom: 0; left: -2px; width: 14px;
  background: linear-gradient(90deg, rgba(0,0,0,0.5), rgba(255,255,255,0.06));
  border-radius: 10px 2px 2px 10px; transform: translateZ(-6px);
}
.ebk-cover::after {
  content: ""; position: absolute; top: 2px; bottom: 2px; right: -7px; width: 8px;
  background: repeating-linear-gradient(180deg, #efe9dd, #efe9dd 1px, #cfc8b8 2px, #efe9dd 3px);
  border-radius: 0 3px 3px 0; transform: translateZ(-3px);
}
.ebk-cover:hover { transform: perspective(1400px) rotateY(-6deg) rotateX(1deg) translateY(-6px); filter: drop-shadow(20px 30px 46px rgba(0,0,0,0.55)); }
.ebk-cover__glow {
  position: absolute; inset: 0; border-radius: 10px; pointer-events: none;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.08);
  background: linear-gradient(115deg, rgba(255,255,255,0.18), transparent 42%);
  opacity: 0.7; transition: opacity 600ms var(--ease);
}
.ebk-cover:hover .ebk-cover__glow { opacity: 1; }
.ebk-cover__hint {
  position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%);
  display: inline-flex; align-items: center; gap: 0.45rem; white-space: nowrap;
  font-family: var(--font-display); font-weight: 600; font-size: 0.9rem; color: #2a1c05;
  background: linear-gradient(110deg, var(--ember), var(--ember-deep));
  padding: 0.6rem 1.1rem; border-radius: 999px;
  box-shadow: 0 10px 26px -8px rgba(245,165,36,0.7);
  transition: transform 400ms var(--ease);
}
.ebk-cover:hover .ebk-cover__hint { transform: translateX(-50%) translateY(-3px); }
.ebk-cover__ic { font-size: 1rem; }
.ebk-cover__cap { color: var(--text-inv-mut); font-size: 0.9rem; text-align: center; }

/* ---------- flip-book lightbox ---------- */
.flip-lightbox {
  position: fixed; inset: 0; z-index: 120; display: none;
  align-items: center; justify-content: center; padding: 1.2rem;
}
.flip-lightbox.open { display: flex; }
.flip-lightbox__backdrop {
  position: absolute; inset: 0; background: rgba(5, 4, 12, 0.86);
  backdrop-filter: blur(10px); animation: fadein 240ms var(--ease);
}
@keyframes fadein { from { opacity: 0; } to { opacity: 1; } }
.flip-lightbox__inner {
  position: relative; z-index: 1; width: 100%; max-width: 980px;
  display: grid; justify-items: center; gap: 0.6rem;
  animation: popin 320ms var(--ease-spring);
}
@keyframes popin { from { opacity: 0; transform: scale(0.94); } to { opacity: 1; transform: none; } }
.flip-lightbox__close {
  position: absolute; top: -8px; right: 0; z-index: 3;
  width: 44px; height: 44px; border-radius: 50%; cursor: pointer;
  border: 1px solid var(--line); background: rgba(255,255,255,0.08); color: #fff; font-size: 1.5rem;
  display: grid; place-items: center; transition: background var(--dur) var(--ease);
}
.flip-lightbox__close:hover { background: rgba(245,165,36,0.22); }
/* larger, readable book inside the lightbox */
.flip-lightbox .flip-wrap { width: 100%; perspective: 3000px; }
.flip-lightbox .flip-stage {
  width: min(94vw, 860px);
  transform: rotateX(6deg);
}
.flip-lightbox__cta { margin-top: 0.4rem; }
@media (max-width: 560px) {
  .flip-lightbox .flip-stage { transform: none; width: 96vw; }
  .leaf__face { background-size: contain; background-repeat: no-repeat; }
}

/* ---------- Ebbinghaus curve section ---------- */
.ebk-curve {
  background:
    radial-gradient(900px 480px at 88% 12%, rgba(245,165,36,0.12), transparent 60%),
    radial-gradient(800px 480px at 6% 90%, rgba(16,185,129,0.12), transparent 62%),
    var(--ink-950);
  color: var(--text-inv); padding: var(--space-section) 0;
}
.ebk-curve__grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: clamp(2rem, 1rem + 4vw, 4.5rem); align-items: center; }
@media (max-width: 900px) { .ebk-curve__grid { grid-template-columns: 1fr; } }
.ebk-curve__legend { list-style: none; padding: 0; margin: 1.6rem 0 0; display: grid; gap: 0.65rem; }
.ebk-curve__legend li { display: flex; align-items: center; gap: 0.65rem; color: var(--text-inv-soft); font-size: 0.98rem; }
.ebk-curve__legend .sw { width: 26px; height: 4px; border-radius: 4px; flex: none; }
.sw--forget { background: var(--orange); }
.sw--spaced { background: var(--emerald); }
.ebk-curve__chart {
  background: linear-gradient(160deg, rgba(21,19,44,0.7), rgba(11,10,24,0.7));
  border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 1.4rem 1.2rem 1rem;
}
.ebk-curve__chart svg { width: 100%; height: auto; display: block; }
.ebk-curve__chart figcaption { color: var(--text-inv-mut); font-size: 0.82rem; text-align: center; margin-top: 0.6rem; }
/* draw-on animation when revealed */
.curve { stroke-dasharray: 1400; stroke-dashoffset: 1400; }
.reveal.in .curve--forget { animation: draw 1500ms var(--ease) 200ms forwards; }
.reveal.in .curve--spaced { animation: draw 1700ms var(--ease) 600ms forwards; }
.curve-dots circle { opacity: 0; }
.reveal.in .curve-dots circle { animation: dotpop 300ms var(--ease-spring) forwards; }
.reveal.in .curve-dots circle:nth-child(1) { animation-delay: 1100ms; }
.reveal.in .curve-dots circle:nth-child(2) { animation-delay: 1300ms; }
.reveal.in .curve-dots circle:nth-child(3) { animation-delay: 1500ms; }
.reveal.in .curve-dots circle:nth-child(4) { animation-delay: 1700ms; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes dotpop { from { opacity: 0; transform: scale(0); } to { opacity: 1; transform: scale(1); } }
@media (prefers-reduced-motion: reduce) {
  .curve { stroke-dashoffset: 0; }
  .curve-dots circle { opacity: 1; }
}

/* ---------- author credential chips ---------- */
.ebk-creds { display: flex; flex-wrap: wrap; gap: 0.55rem; }
.ebk-creds .cred {
  font-size: 0.85rem; font-weight: 600; color: var(--text-soft);
  background: var(--surface-soft); border: 1px solid #e7e2f7;
  padding: 0.45rem 0.85rem; border-radius: 999px;
}

.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }