:root {
  /* Base dark premium */
  --bg-base: #08090d;
  --bg-gradient-center: #1a1d2a;
  --bg-gradient-edge: #05060a;

  /* Glass */
  --glass-bg: rgba(28, 31, 42, 0.55);
  --glass-bg-solid: rgba(28, 31, 42, 0.92);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-highlight: rgba(255, 255, 255, 0.04);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.45),
                  inset 0 1px 0 var(--glass-highlight);

  /* Texto */
  --text-primary: #f0f1f5;
  --text-secondary: #a5a9b8;
  --text-strong: #ffffff;

  /* Marca */
  --accent: #FF8E21;
  --accent-soft: #ffa147;
  --accent-glow: rgba(255, 142, 33, 0.28);

  /* Botões CTA */
  --btn-bg: linear-gradient(135deg, #1e5cff 0%, #0042DA 100%);
  --btn-bg-hover: linear-gradient(135deg, #2f6bff 0%, #0a4fea 100%);
  --btn-glow: 0 8px 24px rgba(0, 66, 218, 0.35);
  --btn-glow-hover: 0 10px 28px rgba(0, 66, 218, 0.5);
  --btn-color: #ffffff;

  /* Typing dots */
  --typing-dot: #8a8f9c;

  /* Layout */
  --radius: 20px;
  --max-width: 720px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  color: var(--text-primary);
  font-family: 'Open Sans', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background:
    radial-gradient(ellipse at top, var(--bg-gradient-center) 0%, var(--bg-gradient-edge) 70%) fixed,
    var(--bg-base);
}

.chat {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 24px 16px 12px;
  scroll-behavior: smooth;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding-bottom: calc(160px + env(safe-area-inset-bottom, 0px));
  padding-top: calc(24px + env(safe-area-inset-top, 0px));
}

.chat::-webkit-scrollbar { width: 6px; }
.chat::-webkit-scrollbar-track { background: transparent; }
.chat::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
}
.chat::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.15); }

.msg {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  max-width: 100%;
  animation: bubbleIn 380ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.msg--host { justify-content: flex-start; }
.msg--guest { justify-content: flex-end; }

/* Avatar aparece apenas na última mensagem consecutiva do host (estilo WhatsApp) */
.msg--host:has(+ .msg--host) .avatar {
  visibility: hidden;
}

.avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  object-fit: cover;
  flex: 0 0 34px;
  background: #1c1f2a;
  align-self: flex-end;
  border: 1.5px solid var(--glass-border);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.55),
              inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.bubble {
  padding: 12px 16px;
  border-radius: var(--radius);
  max-width: calc(82% - 42px);
  word-wrap: break-word;
  overflow-wrap: anywhere;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  color: var(--text-primary);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  transition: opacity 320ms cubic-bezier(0.22, 1, 0.36, 1),
              transform 320ms cubic-bezier(0.22, 1, 0.36, 1),
              padding 380ms cubic-bezier(0.4, 0, 0.2, 1),
              border-radius 380ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Morph: bubble entrando (Fase B) */
.bubble.is-morphing-in {
  opacity: 0;
  transform: translateY(4px);
}

.msg--host .bubble {
  border-bottom-left-radius: 6px;
}

.msg--guest .bubble {
  border-bottom-right-radius: 6px;
  background: linear-gradient(135deg, var(--accent-soft) 0%, var(--accent) 100%);
  border-color: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  box-shadow: 0 8px 24px var(--accent-glow),
              inset 0 1px 0 rgba(255, 255, 255, 0.15);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.bubble strong { color: var(--text-strong); font-weight: 700; }
.bubble em { font-style: italic; color: var(--text-primary); }
.bubble u { text-decoration: underline; text-underline-offset: 2px; }

.msg--guest .bubble strong,
.msg--guest .bubble em,
.msg--guest .bubble u { color: #ffffff; }

.bubble img,
.bubble audio {
  display: block;
  max-width: 100%;
  border-radius: 14px;
}

.bubble--media {
  padding: 6px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}

.bubble--media img { max-height: 420px; object-fit: contain; }
.bubble--media audio {
  width: min(100%, 360px);
  filter: invert(0.92) hue-rotate(180deg) saturate(0.7);
}

.typing {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 14px 18px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  border-bottom-left-radius: 6px;
  box-shadow: var(--glass-shadow);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  transition: padding 380ms cubic-bezier(0.4, 0, 0.2, 1),
              border-radius 380ms cubic-bezier(0.4, 0, 0.2, 1),
              background 380ms ease-out;
}

.typing span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--typing-dot);
  animation: typingBounce 1.5s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.typing span:nth-child(2) { animation-delay: 0.22s; }
.typing span:nth-child(3) { animation-delay: 0.44s; }

@keyframes typingBounce {
  0%, 70%, 100% { transform: translateY(0); opacity: 0.35; }
  35% { transform: translateY(-4px); opacity: 1; }
}

/* Morph: dots saindo (Fase A) */
.typing.is-morphing-out span {
  animation: none;
  opacity: 0;
  transform: scale(0.4);
  transition: opacity 220ms cubic-bezier(0.4, 0, 0.2, 1),
              transform 220ms cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes bubbleIn {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.96);
    filter: blur(2px);
  }
  60% {
    filter: blur(0);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
  }
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 4px;
  max-width: 100%;
  animation: bubbleIn 380ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.button {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: var(--btn-bg);
  color: var(--btn-color);
  font: inherit;
  font-weight: 600;
  padding: 13px 20px;
  border-radius: 22px;
  cursor: pointer;
  transition: background 140ms ease, transform 120ms ease, box-shadow 200ms ease;
  box-shadow: var(--btn-glow);
  max-width: 100%;
  text-align: left;
  letter-spacing: 0.01em;
  white-space: normal;
  word-wrap: break-word;
  overflow-wrap: anywhere;
  line-height: 1.35;
}

.button:hover {
  background: var(--btn-bg-hover);
  box-shadow: var(--btn-glow-hover);
}
.button:active { transform: scale(0.98); }
.button:focus-visible { outline: 2px solid #9cb5ff; outline-offset: 2px; }
.button[disabled] { opacity: 0.5; cursor: default; box-shadow: none; }

/* Fallback: browsers sem backdrop-filter (Safari antigo, Firefox <103 sem flag) */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .bubble,
  .bubble--media,
  .typing {
    background: var(--glass-bg-solid);
  }
}

@media (max-width: 420px) {
  .chat {
    padding: 16px 12px 8px;
    padding-bottom: calc(140px + env(safe-area-inset-bottom, 0px));
    padding-top: calc(16px + env(safe-area-inset-top, 0px));
  }
  .bubble { padding: 11px 15px; }
  .button { padding: 12px 18px; }
  body { font-size: 15px; }
  .avatar { width: 30px; height: 30px; flex-basis: 30px; }
  .bubble { max-width: calc(85% - 38px); }
}