/* Abertura da landing (protótipo): o livro abre, a pena escreve, voa e vira a marca do Fairleaf.
   Compartilhada pelos três modelos; cada um escolhe como a página se revela (zoom, luz, virar). */

.fl-intro {
  /* Livro é papel: a abertura é sempre clara, em qualquer tema; a página se revela no tema de quem lê. */
  --paper: oklch(95.9% 0.014 85);
  --paper-2: oklch(93.9% 0.019 83);
  --page: oklch(98% 0.009 85);
  --ink: oklch(21.9% 0.007 78);
  --muted: oklch(48.5% 0.023 70);
  --rule: oklch(86.5% 0.03 81);
  --accent: oklch(52.1% 0.158 30);
  color-scheme: light;
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  background: var(--paper);
  perspective: 1800px;
  overflow: hidden;
  cursor: default;
}
.fl-intro[hidden] { display: none; }

/* ── O livro ───────────────────────────────────────────── */
.fl-book {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 270px;
  height: 370px;
  margin: -185px 0 0 -135px;
  transform-style: preserve-3d;
  opacity: 0;
}
.fl-pg {
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(to bottom, transparent 0 33px, color-mix(in oklch, var(--rule) 55%, transparent) 33px 34px) 0 70px / 100% calc(100% - 110px) no-repeat,
    var(--page);
  border-radius: 2px 6px 6px 2px;
  box-shadow: 0 1px 0 var(--rule), 0 26px 50px -24px rgb(60 40 20 / .45);
}
/* A sombra da lombada, no meio do livro aberto. */
.fl-pg::before {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: 26px;
  background: linear-gradient(to right, rgb(60 40 20 / .16), transparent);
}
.fl-cover {
  position: absolute;
  inset: 0;
  transform-origin: left center;
  transform-style: preserve-3d;
}
.fl-cover__front, .fl-cover__back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 3px 8px 8px 3px;
}
.fl-cover__front {
  display: grid;
  place-items: center;
  align-content: center;
  gap: 18px;
  background:
    radial-gradient(120% 90% at 30% 20%, rgb(255 255 255 / .10), transparent 60%),
    linear-gradient(160deg, oklch(47% 0.13 32), oklch(38% 0.11 30));
  box-shadow: inset 0 0 0 1px rgb(255 255 255 / .08), inset 10px 0 18px -10px rgb(0 0 0 / .45), 0 30px 60px -25px rgb(40 20 10 / .6);
}
.fl-cover__front svg { width: 74px; height: 74px; color: oklch(86% 0.06 75); filter: drop-shadow(0 1px 0 rgb(0 0 0 / .35)); }
.fl-cover__front span {
  font-family: var(--display);
  font-weight: 600;
  font-size: 30px;
  letter-spacing: .02em;
  color: oklch(86% 0.06 75);
  text-shadow: 0 1px 0 rgb(0 0 0 / .35);
}
.fl-cover__back {
  transform: rotateY(180deg);
  background: linear-gradient(to left, rgb(60 40 20 / .14), transparent 30px), var(--paper-2);
  box-shadow: inset 0 0 0 1px var(--rule);
}

/* A linha escrita à mão na página da direita. */
.fl-hand {
  position: absolute;
  left: 34px;
  top: 118px;
  font-family: 'Pinyon Script', 'Snell Roundhand', cursive;
  font-size: 44px;
  line-height: 1;
  color: var(--ink);
  white-space: nowrap;
  clip-path: inset(0 100% 0 0);
}

/* ── A pena e a marca ───────────────────────────────────── */
.fl-pen {
  position: absolute;
  left: 0;
  top: 0;
  width: 72px;
  height: 72px;
  color: var(--accent);
  opacity: 0;
  pointer-events: none;
  will-change: transform;
}
.fl-lockup {
  position: relative;
  display: flex;
  align-items: center;
  gap: 20px;
  visibility: hidden;
}
.fl-lockup svg { width: 72px; height: 72px; overflow: visible; }
.fl-lockup .leaf { fill: var(--accent); fill-opacity: 0; stroke: var(--accent); stroke-width: .7; stroke-dasharray: 1; stroke-dashoffset: 1; }
.fl-lockup .vein { fill: none; stroke: var(--paper); stroke-width: 1.7; stroke-linecap: round; stroke-dasharray: 1; stroke-dashoffset: 1; }
.fl-lockup .stem { fill: none; stroke: var(--accent); stroke-width: 1.8; stroke-linecap: round; stroke-dasharray: 1; stroke-dashoffset: 1; }
.fl-lockup .name {
  font-family: var(--display);
  font-weight: 600;
  font-size: 60px;
  letter-spacing: -.015em;
  line-height: 1;
  color: var(--ink);
  clip-path: inset(0 100% 0 0);
}
.fl-lockup .line {
  position: absolute;
  left: -40%;
  right: -40%;
  top: calc(100% + 22px);
  margin: 0;
  text-align: center;
  font-family: var(--ui);
  font-size: 17px;
  color: var(--muted);
  opacity: 0;
}

/* ── Pular e rever ──────────────────────────────────────── */
.fl-skip {
  position: absolute;
  right: 24px;
  bottom: calc(22px + env(safe-area-inset-bottom, 0px));
  font: 500 13px/1 var(--ui);
  color: var(--muted);
  background: none;
  border: 0;
  padding: 10px 12px;
  cursor: pointer;
}
.fl-skip:hover { color: var(--ink); }
@media (max-width: 640px) {
  /* Aberto, o livro ocupa duas páginas: 2 × 160 px cabem com folga numa tela de 360 px. */
  .fl-book { width: 160px; height: 220px; margin: -110px 0 0 -80px; }
  .fl-pg { background-position: 0 50px; background-size: 100% calc(100% - 80px); }
  .fl-hand { left: 16px; top: 64px; font-size: 25px; }
  .fl-cover__front svg { width: 46px; height: 46px; }
  .fl-cover__front span { font-size: 19px; }
  .fl-pen, .fl-lockup svg { width: 52px; height: 52px; }
  .fl-lockup { gap: 14px; }
  .fl-lockup .name { font-size: 42px; }
}