:root {
  color-scheme: dark;
  --base: #0c0f22;
  --vidro: rgba(14, 17, 38, 0.66);
  --vidro-borda: rgba(255, 255, 255, 0.08);
  --superficie: rgba(255, 255, 255, 0.07);
  --superficie-forte: rgba(255, 255, 255, 0.11);
  --superficie-borda: rgba(255, 255, 255, 0.1);
  --claro: #eef0ff;
  --claro-suave: rgba(238, 240, 255, 0.58);
  --acento-1: #8b7cf6;
  --acento-2: #4f9cf5;
  --raio: 20px;
  --sombra: 0 12px 32px -14px rgba(0, 0, 0, 0.6), 0 2px 6px rgba(0, 0, 0, 0.18);
  --fonte: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--base);
  font-family: var(--fonte);
  color: var(--claro);
  -webkit-font-smoothing: antialiased;
}

/* Fundo feito só em CSS: gradiente índigo com brilhos suaves e uma malha
   de pontinhos bem discreta, que some nas bordas. */
#fundo {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(55% 40% at 12% 8%, rgba(139, 124, 246, 0.34), transparent 70%),
    radial-gradient(45% 38% at 92% 28%, rgba(79, 156, 245, 0.26), transparent 70%),
    radial-gradient(60% 45% at 40% 105%, rgba(192, 132, 252, 0.18), transparent 70%),
    linear-gradient(180deg, #0c0f22 0%, #11152f 55%, #0d1026 100%);
}

#fundo::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1.2px);
  background-size: 22px 22px;
  -webkit-mask-image: radial-gradient(80% 70% at 50% 40%, black 30%, transparent 85%);
  mask-image: radial-gradient(80% 70% at 50% 40%, black 30%, transparent 85%);
}

#app {
  position: relative;
  z-index: 1;
  height: 100dvh;
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

/* ---------- Cabeçalho ---------- */

#topo {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: calc(12px + env(safe-area-inset-top, 0px)) 18px 12px;
  background: var(--vidro);
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  border-bottom: 1px solid var(--vidro-borda);
}

.avatar {
  position: relative;
  flex: 0 0 auto;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(140deg, var(--acento-1), var(--acento-2));
  box-shadow: 0 6px 18px -6px rgba(139, 124, 246, 0.8), inset 0 0 0 1px rgba(255, 255, 255, 0.2);
  color: white;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.avatar-topo { width: 42px; height: 42px; font-size: 18px; }

.avatar-topo i {
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid #11152f;
  background: #9aa3b2;
  transition: background 0.3s ease;
}
.avatar-topo i.online { background: #34d399; }
.avatar-topo i.online::after {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  border: 2px solid #34d399;
  animation: pulso 2.4s ease-out infinite;
}
.avatar-topo i.offline { background: #f59e0b; }
.avatar-topo i.bloqueado { background: #f87171; }

@keyframes pulso {
  0% { transform: scale(1); opacity: 0.8; }
  100% { transform: scale(2.2); opacity: 0; }
}

.topo-texto h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.topo-texto p {
  margin: 1px 0 0;
  font-size: 12.5px;
  color: var(--claro-suave);
}

.topo-selo {
  margin-left: auto;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #c9c1ff;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(139, 124, 246, 0.12);
  border: 1px solid rgba(139, 124, 246, 0.26);
  white-space: nowrap;
}

@media (max-width: 380px) {
  .topo-selo { display: none; }
}

/* ---------- Área de mensagens ---------- */

#mensagens {
  flex: 1 1 auto;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 20px 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  scroll-behavior: smooth;
}

#mensagens::-webkit-scrollbar { width: 0; }

#boas-vindas {
  margin: auto;
  max-width: 340px;
  text-align: center;
  padding: 34px 26px 28px;
  border-radius: 28px;
  background: var(--superficie);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--superficie-borda);
  box-shadow: var(--sombra);
  animation: surgir 0.6s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.avatar-grande {
  width: 72px;
  height: 72px;
  font-size: 30px;
  margin: 0 auto 18px;
}

#boas-vindas h2 {
  margin: 0 0 8px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

#boas-vindas p {
  margin: 0 0 22px;
  font-size: 14px;
  line-height: 1.55;
  color: var(--claro-suave);
}

#botao-comecar {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: none;
  cursor: pointer;
  font: inherit;
  font-size: 15px;
  font-weight: 700;
  color: white;
  padding: 13px 26px;
  border-radius: 999px;
  background: linear-gradient(140deg, var(--acento-1), var(--acento-2));
  box-shadow: 0 12px 26px -10px rgba(139, 124, 246, 0.9);
  transition: transform 0.15s ease;
}
#botao-comecar:active { transform: scale(0.97); }

.separador-dia {
  align-self: center;
  margin: 4px 0 12px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--claro-suave);
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--superficie);
  border: 1px solid var(--superficie-borda);
}

.linha {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  animation: surgir 0.35s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.linha.recebida { justify-content: flex-start; }
.linha.enviada { justify-content: flex-end; }
.linha.inicio-grupo { margin-top: 10px; }

.avatar-mini { width: 30px; height: 30px; font-size: 13px; }
.espaco-avatar { width: 30px; flex: 0 0 auto; }

.bolha {
  max-width: min(78%, 480px);
  padding: 10px 14px 8px;
  font-size: 14.5px;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}

.bolha strong { font-weight: 700; color: white; }
.bolha a { font-weight: 600; text-decoration: underline; text-underline-offset: 2px; }

/* Mensagem da Sya: vidro escuro, texto claro */
.linha.recebida .bolha {
  background: var(--superficie);
  border: 1px solid var(--superficie-borda);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: var(--claro);
  border-radius: 6px var(--raio) var(--raio) var(--raio);
  box-shadow: var(--sombra);
}
.linha.recebida:not(.inicio-grupo) .bolha { border-radius: var(--raio); }
.linha.recebida .bolha a { color: #aebcff; }

/* Mensagem do professor: gradiente violeta → azul */
.linha.enviada .bolha {
  background: linear-gradient(140deg, var(--acento-1), var(--acento-2));
  color: white;
  border-radius: var(--raio) 6px var(--raio) var(--raio);
  box-shadow: 0 12px 26px -14px rgba(99, 102, 241, 0.9);
}
.linha.enviada .bolha a { color: white; }

.hora {
  display: block;
  margin-top: 3px;
  font-size: 10.5px;
  text-align: right;
  opacity: 0.5;
  font-variant-numeric: tabular-nums;
}

/* ---------- Opções em grade de 2 ---------- */

.opcoes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 8px 0 6px 38px;
  max-width: 420px;
}

.opcao {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  min-height: 92px;
  padding: 13px 13px 12px;
  border: 1px solid var(--superficie-borda);
  border-radius: 18px;
  background: var(--superficie);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: var(--claro);
  font: inherit;
  text-align: left;
  cursor: pointer;
  box-shadow: var(--sombra);
  transition: transform 0.15s ease, opacity 0.25s ease, background 0.2s ease, border-color 0.2s ease;
  animation: surgir 0.4s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.opcao:active:not(:disabled) { transform: scale(0.97); background: var(--superficie-forte); }

@media (hover: hover) {
  .opcao:hover:not(:disabled) {
    transform: translateY(-2px);
    background: var(--superficie-forte);
    border-color: rgba(255, 255, 255, 0.16);
  }
}

.opcao:disabled { cursor: default; opacity: 0.35; }
.opcao.escolhida {
  opacity: 1;
  background: rgba(139, 124, 246, 0.16);
  border-color: rgba(139, 124, 246, 0.7);
  box-shadow: 0 0 0 3px rgba(139, 124, 246, 0.22), var(--sombra);
}

.opcao-icone {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  display: grid;
  place-items: center;
}
.opcao-icone svg { width: 19px; height: 19px; }

.opcao-titulo {
  font-size: 13.5px;
  font-weight: 650;
  line-height: 1.3;
  letter-spacing: -0.005em;
}

.opcao-descricao {
  margin-top: -6px;
  font-size: 11.5px;
  line-height: 1.35;
  color: var(--claro-suave);
}

.opcao-marca {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: none;
  place-items: center;
  background: var(--acento-1);
  color: white;
}
.opcao.escolhida .opcao-marca { display: grid; }

.opcao:last-child:nth-child(odd) {
  grid-column: 1 / -1;
  min-height: 0;
  flex-direction: row;
  align-items: center;
}
.opcao:last-child:nth-child(odd) .opcao-descricao { margin-top: 0; }

.tom-violeta { background: rgba(139, 124, 246, 0.2); color: #c2b8ff; }
.tom-azul { background: rgba(79, 156, 245, 0.2); color: #9cc8ff; }
.tom-verde { background: rgba(52, 211, 153, 0.18); color: #7ee8bf; }
.tom-ambar { background: rgba(251, 191, 36, 0.18); color: #fcd668; }
.tom-rosa { background: rgba(244, 114, 182, 0.18); color: #f9b1d6; }
.tom-ceu { background: rgba(56, 189, 248, 0.18); color: #8fdcfb; }

/* ---------- Digitando ---------- */

.digitando {
  display: inline-flex;
  gap: 4px;
  padding: 14px 16px;
  background: var(--superficie);
  border: 1px solid var(--superficie-borda);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 6px var(--raio) var(--raio) var(--raio);
}
.digitando i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(238, 240, 255, 0.7);
  animation: pontinho 1.2s ease-in-out infinite;
}
.digitando i:nth-child(2) { animation-delay: 0.15s; }
.digitando i:nth-child(3) { animation-delay: 0.3s; }

@keyframes pontinho {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-4px); opacity: 1; }
}

@keyframes surgir {
  from { opacity: 0; transform: translateY(8px) scale(0.98); }
  to { opacity: 1; transform: none; }
}

/* ---------- Campo de envio ---------- */

#form-envio {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px calc(12px + env(safe-area-inset-bottom, 0px));
  background: var(--vidro);
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  border-top: 1px solid var(--vidro-borda);
}

.campo {
  flex: 1;
  display: flex;
  align-items: center;
  border-radius: 999px;
  background: var(--superficie);
  border: 1px solid var(--superficie-borda);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.campo:focus-within {
  border-color: rgba(139, 124, 246, 0.6);
  box-shadow: 0 0 0 3px rgba(139, 124, 246, 0.2);
}

#campo-texto {
  flex: 1;
  min-width: 0;
  border: none;
  background: transparent;
  padding: 13px 18px;
  font: inherit;
  font-size: 15px;
  color: var(--claro);
}
#campo-texto::placeholder { color: rgba(238, 240, 255, 0.4); }
#campo-texto:focus { outline: none; }

#botao-enviar {
  flex: 0 0 auto;
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 50%;
  display: grid;
  place-items: center;
  cursor: pointer;
  color: white;
  background: linear-gradient(140deg, var(--acento-1), var(--acento-2));
  box-shadow: 0 10px 22px -10px rgba(139, 124, 246, 0.95);
  transition: transform 0.15s ease, opacity 0.2s ease, filter 0.2s ease;
}
#botao-enviar:active:not(:disabled) { transform: scale(0.92); }
#botao-enviar:disabled {
  cursor: default;
  filter: grayscale(1);
  opacity: 0.35;
  box-shadow: none;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}