:root {
  --bg: #0f1115;
  --bg-elev: #161a22;
  --bg-elev-2: #1d2230;
  --border: #262c3a;
  --text: #e6e8ee;
  --text-dim: #9aa3b2;
  --accent: #c9a86a;
  --accent-soft: #3a3220;
  --user-bubble: #243246;
  --ai-bubble: transparent;
  --erro: #e57373;
  --max-w: 780px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

body {
  display: flex;
  flex-direction: column;
}

/* ============ LOGIN ============ */
.login-body {
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.login-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px 32px;
  width: 100%;
  max-width: 360px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}

.login-card h1 {
  margin: 0 0 4px;
  font-size: 28px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.5px;
}

.login-card .subtitle {
  margin: 0 0 28px;
  color: var(--text-dim);
  font-size: 14px;
}

.login-card form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.login-card input {
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 15px;
  outline: none;
}
.login-card input:focus { border-color: var(--accent); }

.login-card button {
  background: var(--accent);
  color: #1a1408;
  border: 0;
  border-radius: 8px;
  padding: 12px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
}
.login-card button:hover { filter: brightness(1.05); }

.login-card .erro {
  color: var(--erro);
  font-size: 14px;
  margin: 4px 0 0;
  text-align: center;
}

/* ============ TOPO ============ */
.topo {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 20px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.marca {
  font-weight: 600;
  font-size: 16px;
  color: var(--accent);
  letter-spacing: 0.3px;
}

.modos {
  display: flex;
  gap: 6px;
  flex: 1;
  justify-content: center;
  flex-wrap: wrap;
}

.modo-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
}
.modo-btn:hover { color: var(--text); border-color: var(--text-dim); }
.modo-btn.ativo {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.acoes {
  display: flex;
  gap: 10px;
  align-items: center;
}

.acoes button, .acoes .logout {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  text-decoration: none;
}
.acoes button:hover, .acoes .logout:hover {
  color: var(--text);
  border-color: var(--text-dim);
}

/* ============ CONVERSA ============ */
.conversa {
  flex: 1;
  overflow-y: auto;
  padding: 32px 16px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.vazio {
  margin: auto 0;
  text-align: center;
  color: var(--text-dim);
  font-size: 18px;
  font-style: italic;
}

.msg {
  width: 100%;
  max-width: var(--max-w);
  margin-bottom: 28px;
  word-wrap: break-word;
}

.msg-user {
  display: flex;
  justify-content: flex-end;
}

.msg-user > p {
  background: var(--user-bubble);
  padding: 12px 18px;
  border-radius: 18px;
  max-width: 85%;
  margin: 0;
}

.msg-assistant {
  padding: 4px 2px;
}

.msg p { margin: 0 0 10px; }
.msg p:last-child { margin-bottom: 0; }
.msg ul, .msg ol { margin: 6px 0 10px; padding-left: 22px; }
.msg li { margin-bottom: 4px; }
.msg blockquote {
  border-left: 3px solid var(--accent-soft);
  margin: 8px 0;
  padding: 4px 0 4px 12px;
  color: var(--text-dim);
  font-style: italic;
}
.msg code {
  background: var(--bg-elev-2);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}
.msg pre {
  background: var(--bg-elev-2);
  padding: 12px;
  border-radius: 8px;
  overflow-x: auto;
}
.msg pre code { background: none; padding: 0; }
.msg strong { color: var(--accent); }
.msg em { color: var(--text-dim); }
.msg h1, .msg h2, .msg h3 {
  color: var(--text);
  margin: 14px 0 8px;
  font-weight: 600;
}
.msg h1 { font-size: 1.3em; }
.msg h2 { font-size: 1.15em; }
.msg h3 { font-size: 1.05em; }

/* ============ ENTRADA ============ */
.entrada {
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
  padding: 12px 16px 16px;
}

.entrada form {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  gap: 10px;
  align-items: flex-end;
}

#campo-msg {
  flex: 1;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
  resize: vertical;
  min-height: 48px;
  max-height: 240px;
  outline: none;
  line-height: 1.5;
}
#campo-msg:focus { border-color: var(--accent); }

#btn-enviar {
  background: var(--accent);
  color: #1a1408;
  border: 0;
  border-radius: 10px;
  padding: 12px 22px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  height: 48px;
}
#btn-enviar:hover { filter: brightness(1.05); }
#btn-enviar:disabled { opacity: 0.5; cursor: not-allowed; }

/* ============ MOBILE ============ */
@media (max-width: 600px) {
  .topo { padding: 10px 12px; gap: 8px; }
  .marca { font-size: 14px; }
  .modo-btn { padding: 5px 10px; font-size: 12px; }
  .acoes button, .acoes .logout { padding: 5px 10px; font-size: 12px; }
  .conversa { padding: 16px 10px 24px; }
  .msg { padding: 12px 14px; font-size: 15px; }
  .entrada { padding: 10px 12px 12px; }
}