:root {
  --bg: #fbf7f0;
  --card: #ffffff;
  --ink: #1f2a37;
  --muted: #5b6676;
  --brand: #2f6f5e;
  --brand-2: #e9a23b;
  --soft: #e7f1ec;
  --line: #e6e0d6;
  --radius: 18px;
  --shadow: 0 6px 24px rgba(31, 42, 55, .08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Nunito", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
}
h1, h2, h3 { font-family: "Fraunces", Georgia, serif; line-height: 1.15; margin: 0 0 .5em; }
a { color: var(--brand); }
img { max-width: 100%; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }

/* Topo */
header.top {
  position: sticky; top: 0; z-index: 10;
  background: rgba(251, 247, 240, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
header.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; height: 64px; }
.logo { font-family: "Fraunces", serif; font-weight: 700; font-size: 1.2rem; color: var(--ink); text-decoration: none; }
.logo span { color: var(--brand); }
nav.menu { display: flex; gap: 18px; }
nav.menu a { text-decoration: none; color: var(--muted); font-weight: 600; }
nav.menu a:hover { color: var(--brand); }

.btn {
  display: inline-block; border: 0; cursor: pointer;
  background: var(--brand); color: #fff; font: inherit; font-weight: 700;
  padding: 12px 22px; border-radius: 999px; text-decoration: none;
  transition: transform .15s, background .15s;
}
.btn:hover { transform: translateY(-1px); background: #255a4c; }
.btn.alt { background: var(--brand-2); color: #1f2a37; }
.btn.alt:hover { background: #d8912a; }
.btn.ghost { background: transparent; color: var(--brand); border: 2px solid var(--brand); }

/* Hero */
.hero { padding: 64px 0 48px; }
.hero .wrap { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: center; }
.hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
.hero p.lead { font-size: 1.15rem; color: var(--muted); max-width: 34em; }
.hero .acoes { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.hero-art {
  background: var(--soft); border-radius: 28px; aspect-ratio: 1 / 1;
  display: grid; place-items: center; font-size: 7rem; box-shadow: var(--shadow);
}

section { padding: 56px 0; }
section.claro { background: #fff; border-block: 1px solid var(--line); }
.titulo-sec { text-align: center; max-width: 640px; margin: 0 auto 32px; }
.titulo-sec p { color: var(--muted); }

.grade { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow);
}
.card .icone { font-size: 2rem; }
.card h3 { font-size: 1.2rem; margin-top: 8px; }
.card p { color: var(--muted); margin: 0; }

.faixa-ia {
  background: var(--brand); color: #fff; border-radius: 28px; padding: 36px;
  display: grid; grid-template-columns: 1.4fr 1fr; gap: 24px; align-items: center;
}
.faixa-ia p { color: #dcebe5; }
.faixa-ia ul { margin: 0; padding-left: 1.2em; color: #f3f7f5; }

.sobre { display: grid; grid-template-columns: 1fr 1.6fr; gap: 32px; align-items: center; }
.foto {
  background: var(--soft); border-radius: 50%; aspect-ratio: 1 / 1; max-width: 300px;
  display: grid; place-items: center; font-size: 6rem; margin: 0 auto;
}

.contato { text-align: center; }
.contato .acoes { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }

footer { padding: 28px 0; text-align: center; color: var(--muted); font-size: .9rem; border-top: 1px solid var(--line); }

/* ===== Página Estudar ===== */
.estudo { display: grid; grid-template-columns: 280px 1fr; gap: 20px; padding: 20px 0; height: calc(100dvh - 64px); }
.painel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; overflow: auto; }
.painel label { display: block; font-weight: 700; font-size: .9rem; margin: 14px 0 6px; }
.painel select, .painel input {
  width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 12px; font: inherit; background: #fff;
}
.modos { display: grid; gap: 8px; }
.modo {
  text-align: left; background: var(--bg); border: 2px solid transparent; border-radius: 12px;
  padding: 10px 12px; cursor: pointer; font: inherit;
}
.modo strong { display: block; }
.modo small { color: var(--muted); }
.modo.ativo { border-color: var(--brand); background: var(--soft); }
.aviso { margin-top: 16px; font-size: .82rem; color: var(--muted); background: #fff7e8; border-radius: 12px; padding: 10px 12px; }

.chat { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; min-height: 0; }
.msgs { flex: 1; overflow-y: auto; padding: 20px; display: flex; flex-direction: column; gap: 14px; }
.msg { max-width: 82%; padding: 12px 16px; border-radius: 16px; word-wrap: break-word; }
.msg p { margin: 0 0 .5em; } .msg p:last-child { margin: 0; }
.msg ul, .msg ol { margin: .3em 0 .5em; padding-left: 1.3em; }
.msg.ia { background: var(--soft); align-self: flex-start; border-bottom-left-radius: 4px; }
.msg.eu { background: var(--brand); color: #fff; align-self: flex-end; border-bottom-right-radius: 4px; }
.msg.erro { background: #fdecec; color: #8a1f1f; align-self: center; font-size: .92rem; }
.msg img { border-radius: 10px; max-height: 220px; display: block; margin-bottom: 6px; }
.digitando span { display: inline-block; width: 8px; height: 8px; margin: 0 2px; background: var(--brand); border-radius: 50%; animation: pulo 1s infinite; }
.digitando span:nth-child(2) { animation-delay: .15s; } .digitando span:nth-child(3) { animation-delay: .3s; }
@keyframes pulo { 0%, 80%, 100% { opacity: .3; transform: translateY(0); } 40% { opacity: 1; transform: translateY(-4px); } }

.sugestoes { display: flex; flex-wrap: wrap; gap: 8px; padding: 0 20px 10px; }
.sugestoes button { background: var(--bg); border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; cursor: pointer; font: inherit; font-size: .88rem; }
.sugestoes button:hover { border-color: var(--brand); }

.entrada { border-top: 1px solid var(--line); padding: 12px; display: flex; gap: 8px; align-items: flex-end; }
.entrada textarea {
  flex: 1; resize: none; border: 1px solid var(--line); border-radius: 14px; padding: 12px; font: inherit; max-height: 140px; min-height: 48px;
}
.icon-btn { background: var(--bg); border: 1px solid var(--line); border-radius: 12px; width: 48px; height: 48px; cursor: pointer; font-size: 1.3rem; flex-shrink: 0; }
.previa { padding: 0 12px 8px; display: none; align-items: center; gap: 8px; font-size: .88rem; color: var(--muted); }
.previa img { height: 48px; border-radius: 8px; }
.previa button { border: 0; background: none; cursor: pointer; color: #8a1f1f; font-weight: 700; }

@media (max-width: 820px) {
  nav.menu { display: none; }
  .hero .wrap, .faixa-ia, .sobre { grid-template-columns: 1fr; }
  .hero-art { max-width: 260px; margin: 0 auto; font-size: 5rem; }
  .estudo { grid-template-columns: 1fr; height: auto; }
  .painel { order: 2; }
  .chat { height: 75dvh; }
  .msg { max-width: 92%; }
}

/* Tela de senha */
[hidden] { display: none !important; }
.tela-senha { min-height: calc(100dvh - 64px); display: grid; place-items: center; padding: 16px; }
.tela-senha .card { width: 100%; max-width: 360px; text-align: center; }
.tela-senha input { width: 100%; padding: 12px; border: 1px solid var(--line); border-radius: 12px; font: inherit; margin: 8px 0 12px; }
.erro-senha { color: #8a1f1f; margin: 0 0 10px; }

/* Voz */
.topo-acoes { display: flex; gap: 8px; }
.btn.pequeno { padding: 8px 14px; font-size: .9rem; }
#btn-voz.desligado { color: var(--muted); border-color: var(--line); }
.icon-btn.mic { background: var(--brand-2); border-color: var(--brand-2); font-size: 1.4rem; }
.icon-btn.mic.gravando { background: #d64545; border-color: #d64545; animation: pulsar 1.2s infinite; }
@keyframes pulsar { 0%, 100% { box-shadow: 0 0 0 0 rgba(214, 69, 69, .5); } 50% { box-shadow: 0 0 0 10px rgba(214, 69, 69, 0); } }
.gravando { display: flex; align-items: center; gap: 8px; padding: 0 16px 8px; color: #b23030; font-weight: 700; font-size: .92rem; }
.gravando .ponto { width: 10px; height: 10px; border-radius: 50%; background: #d64545; animation: pulsar 1.2s infinite; }
.ouvir { margin-top: 6px; background: none; border: 0; padding: 2px 0; cursor: pointer; color: var(--brand); font: inherit; font-size: .82rem; font-weight: 700; }
@media (max-width: 480px) {
  .topo-acoes .btn.pequeno { padding: 6px 10px; font-size: .8rem; }
  .logo { font-size: 1.05rem; }
  .entrada { gap: 6px; padding: 10px; }
  .entrada .btn { padding: 12px 14px; }
  .icon-btn { width: 44px; height: 48px; }
}
.icon-btn.mic { touch-action: none; user-select: none; -webkit-user-select: none; -webkit-touch-callout: none; width: 56px; }