:root {
  --bg-blur: 0px;
  --title-color: #0b0b0b;
  --title-shadow: 0 1px 0 rgba(255,255,255,0.6);
  --text-color: #1e1e1e;
  --muted: #444;
  --btn-bg: rgba(255, 255, 255, 0.72);
  --btn-bg-hover: rgba(255, 255, 255, 0.9);
  --btn-border: rgba(0, 0, 0, 0.08);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text-color);
  line-height: 1.6;
}

/* Fundo com “Guarda-chuva de Whitney” em 50% */
.bg {
  position: fixed;
  inset: 0;
  background-image: url('./Captura%20de%20tela%202025-10-06%20164920.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.5;
  filter: blur(var(--bg-blur));
  z-index: -1;
}

.header {
  position: sticky;
  top: 0;
  display: grid;
  grid-template-rows: auto auto;
  gap: 12px;
  padding: 20px clamp(16px, 4vw, 32px) 12px;
  backdrop-filter: saturate(140%) blur(4px);
}

/* Página inicial: posiciona os botões na parte inferior do terço superior */
body.home .header {
  position: relative;
  min-height: 66.67vh; /* até o topo do terço inferior */
  display: grid;
  align-content: start; /* mantém o título no topo */
  padding-top: 24px;
  padding-bottom: 16px;
}
body.home .nav { align-self: end; } /* botões descem para a base do header */

.title {
  margin: 0;
  font-family: "Playfair Display", Georgia, serif;
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 40px);
  color: var(--title-color);
  text-shadow: var(--title-shadow);
}
.subtitle {
  margin: 4px 0 0 0;
  max-width: 70ch;
  color: var(--muted);
}

.nav {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

/* Quando há apenas um botão, centraliza */
.nav:has(.btn:only-child) {
  grid-template-columns: 1fr;
  justify-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 16px;
  font-weight: 600;
  color: #111;
  text-decoration: none;
  background: var(--btn-bg);
  border: 1px solid var(--btn-border);
  border-radius: 10px;
  transition: background-color 160ms ease, transform 120ms ease, scale 200ms ease;
}
.btn:hover { 
  background: var(--btn-bg-hover);
  scale: 1.05;
}
.btn:active { transform: translateY(1px); }

.main {
  padding: 24px clamp(16px, 4vw, 32px) 48px;
}

.intro h2 {
  margin-top: 8px;
  font-size: clamp(18px, 2.2vw, 24px);
}
.intro p {
  max-width: 64ch;
  color: var(--muted);
}

/* Texto auxiliar mais suave */
.muted { color: var(--muted); }

/* Grid de memórias */
.grid-memorias {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

.grid-memorias .memoria {
  display: block;
  border-radius: 12px;
  overflow: hidden;
  background: rgba(255,255,255,0.6);
  border: 1px solid var(--btn-border);
  transition: transform 160ms ease, box-shadow 200ms ease;
}
.grid-memorias .memoria:hover { transform: scale(1.02); box-shadow: 0 6px 24px rgba(0,0,0,0.12); }
.grid-memorias img {
  display: block;
  width: 100%;
  height: 160px;
  object-fit: cover;
}

/* Container do vídeo */
.video-container {
  position: relative;
  width: 100%;
  max-width: 1280px;
  height: 0;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  margin: 32px auto;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* Wikipedia embed */
.wiki-container {
  position: relative;
  width: 100%;
  max-width: 1280px;
  height: 70vh;
  margin: 16px auto;
  border-radius: 12px;
  overflow: hidden;
  background: rgba(255,255,255,0.85);
  border: 1px solid var(--btn-border);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}
.wiki-container iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* Lattes embed */
.lattes-container {
  position: relative;
  width: 100%;
  max-width: 1280px;
  height: 70vh;
  margin: 8px auto 24px auto;
  border-radius: 12px;
  overflow: hidden;
  background: rgba(255,255,255,0.85);
  border: 1px solid var(--btn-border);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}
.lattes-container iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* Álbum de fotos (mensagens) */
.album {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
}
.album-viewport {
  position: relative;
  width: 100%;
  max-width: 980px;
  aspect-ratio: 16 / 9;
  border-radius: 12px;
  overflow: hidden;
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--btn-border);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  perspective: 1600px; /* 3D para virada */
}
.book {
  position: absolute;
  inset: 0;
}
.half {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 50%;
  background-size: contain; /* cada arquivo é uma página inteira */
  background-position: center;
  background-repeat: no-repeat;
  opacity: 1;
}
.half.left { left: 0; }
.half.right { right: 0; }
.half.show { background-image: var(--img); }

/* Folha animada (vira apenas uma metade por vez) */
.sheet {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 50%;
  transform-style: preserve-3d;
  transform-origin: left center;
  pointer-events: none;
  transition: transform 800ms ease;
}
.sheet.hidden { visibility: hidden; }
.sheet .face {
  position: absolute;
  inset: 0;
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  backface-visibility: hidden;
}
.sheet .front { background-image: var(--img); }
.sheet .back { transform: rotateY(180deg); background-image: var(--img); }

/* Lados explícitos para frente/verso (sem recorte) */
.side-left { transform: translateZ(0); }
.side-right { transform: translateZ(0); }

.sheet.flip-forward { transform: rotateY(-180deg); }
.sheet.flip-back {
  left: 0;
  transform-origin: right center;
  transform: rotateY(180deg);
}
.album-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.9);
  border: 1px solid var(--btn-border);
  cursor: pointer;
  font-size: 28px;
  display: grid;
  place-items: center;
  color: #111;
}
.album-btn:hover { background: var(--btn-bg-hover); }

/* Lightbox */
.lightbox[aria-hidden="true"] { display: none; }
.lightbox[aria-hidden="false"] {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0,0,0,0.7);
  z-index: 999;
}
.lightbox-img {
  max-width: min(92vw, 1200px);
  max-height: 86vh;
  border-radius: 12px;
  box-shadow: 0 12px 48px rgba(0,0,0,0.35);
}
.lightbox-caption {
  margin-top: 8px;
  padding: 6px 10px;
  background: rgba(255,255,255,0.85);
  border-radius: 8px;
  color: #111;
  font-size: 14px;
}
.lightbox-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.9);
  border: 1px solid var(--btn-border);
  cursor: pointer;
  font-size: 22px;
}

/* Botões de navegação do lightbox */
.lightbox-prev,
.lightbox-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.9);
  border: 1px solid var(--btn-border);
  cursor: pointer;
  font-size: 28px;
  display: grid;
  place-items: center;
  color: #111;
}
.lightbox-prev { left: 16px; }
.lightbox-next { right: 16px; }
.lightbox-prev:hover,
.lightbox-next:hover { background: var(--btn-bg-hover); }

@media (max-width: 640px) {
  .nav { grid-template-columns: 1fr; }
  .video-container {
    margin: 16px 0;
    max-width: 100%;
  }
}

/* Árvore de conexões */
.tree {
  --line: #d7d7d7;
  --dot: #bbb;
  margin-top: 8px;
  padding-left: 0;
}
.tree ul {
  margin: 0;
  padding-left: 20px;
  list-style: none;
}
.tree li {
  position: relative;
  margin: 6px 0;
  padding-left: 12px;
}
.tree li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.9em;
  width: 8px;
  height: 1px;
  background: var(--line);
}
.tree details > summary {
  cursor: pointer;
  padding: 6px 8px;
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--btn-border);
  border-radius: 8px;
  font-weight: 600;
}
.tree details[open] > summary {
  background: rgba(255,255,255,0.9);
}
.tree li[role="treeitem"]:not(:has(details))::after {
  content: "";
  position: absolute;
  left: -2px;
  top: 0.65em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--dot);
}

/* GraphML SVG container */
.graphml-container {
  width: 100%;
  max-width: 1280px;
  border-radius: 12px;
  overflow: auto;
  background: rgba(255,255,255,0.6);
  border: 1px solid var(--btn-border);
}
.graphml-container svg {
  width: 100%;
  height: auto;
}
.graph-edge {
  stroke: #7e8a97;
  stroke-width: 1.5;
  opacity: 0.9;
}
.graph-node rect {
  fill: #ffffff;
  stroke: #d0d4da;
  stroke-width: 1.2;
  filter: drop-shadow(0 2px 6px rgba(0,0,0,0.08));
}
.graph-text {
  dominant-baseline: middle;
  text-anchor: middle;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  font-size: 12px;
  fill: #111;
}