:root {
  color-scheme: light;
  /* Identidad visual oficial UDD — azul muestreado del logo real (#085CA3) */
  --udd-blue:       #085CA3;   /* azul UDD primario (acento principal) */
  --udd-blue-dark:  #064B85;   /* hover, profundidad, texto sobre claro */
  --udd-blue-light: #E4EFF8;   /* fondos sutiles, chips */
  --ink:            #1A2230;   /* texto principal */
  --ink-soft:       #4A5568;   /* texto secundario */
  --paper:          #F7F9FB;   /* fondo general */
  --surface:        #EDF1F6;   /* tarjetas, input */
  --line:           #D5DEE8;   /* bordes, separadores */
  --gold:           #C8A04B;   /* acento institucional — usar con MUCHA moderación */

  /* Tokens semánticos derivados (conservan los nombres que usa el resto del CSS) */
  --user-bubble: var(--udd-blue);   /* burbuja del usuario = azul UDD */
  --on-accent:   #FFFFFF;           /* texto/íconos SOBRE azul (fijo, no sigue al tema) */
  --user-text:   var(--on-accent);  /* texto claro sobre la burbuja azul */
  --ok:          #4f7a52;           /* estado conectado (verde semántico — se conserva) */
  --warn:        var(--gold);       /* estado de aviso (único uso del dorado) */
  --err:         #a8412f;           /* estado de error (rojo semántico — se conserva) */

  --surface-elevated: #FFFFFF;   /* tarjetas / superficies elevadas sobre el fondo frío */

  /* Colores antes hardcodeados, ahora tokenizados (los redefine el tema oscuro) */
  --bg-tint:            #E8EFF6;              /* tinte del degradado de fondo */
  --topbar-bg:          rgba(255, 255, 255, .82);
  --scroll-thumb-hover: #C2CEDB;
  --backdrop:           rgba(13, 58, 102, .28);
  --danger-soft:        #FBEAE6;             /* fondo del botón eliminar en hover */
  --logo-bg:            #FFFFFF;             /* disco bajo el monograma (fijo en ambos temas) */

  /* Profundidad — sombras suaves y frías derivadas del azul UDD */
  --shadow-sm: 0 1px 2px rgba(13, 58, 102, .05), 0 1px 3px rgba(13, 58, 102, .06);
  --shadow-md: 0 4px 14px rgba(13, 58, 102, .09), 0 2px 4px rgba(13, 58, 102, .05);
  --shadow-lg: 0 14px 38px rgba(13, 58, 102, .16), 0 4px 10px rgba(13, 58, 102, .07);
  --focus-ring: 0 0 0 3px rgba(1, 76, 143, .16);

  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Inter", system-ui, sans-serif;

  --maxw: 760px;
}

/* ---------- Tema oscuro ---------- */
/* Se activa con data-theme="dark" en <html> (lo fija el script anti-FOUC del
   <head> según la preferencia guardada o prefers-color-scheme). Redefine solo
   los tokens; el resto del CSS los consume sin cambios. */
:root[data-theme="dark"] {
  color-scheme: dark;
  --udd-blue:       #4C9FE0;   /* azul aclarado: contrasta como texto/ícono sobre oscuro */
  --udd-blue-dark:  #7FBCEA;   /* "hover más profundo" se invierte: más claro */
  --udd-blue-light: #12314B;   /* fondos sutiles, chips */
  --ink:            #E7EDF5;
  --ink-soft:       #9DAEC2;
  --paper:          #0D141E;
  --surface:        #16202C;
  --line:           #2C3B4E;
  --gold:           #D9B366;

  --user-bubble: #0A66B2;      /* explícito: blanco sobre este azul cumple AA (~5.5:1) */
  --ok:          #6FA873;
  --err:         #D97F6C;

  --surface-elevated: #1A2634;

  --bg-tint:            #131E2B;
  --topbar-bg:          rgba(13, 20, 30, .75);
  --scroll-thumb-hover: #3A4C63;
  --backdrop:           rgba(0, 0, 0, .55);
  --danger-soft:        rgba(217, 127, 108, .15);

  /* En oscuro las sombras pesan menos; los bordes (--line) hacen de separador. */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .35);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, .45);
  --shadow-lg: 0 12px 30px rgba(0, 0, 0, .55), 0 3px 8px rgba(0, 0, 0, .4);
  --focus-ring: 0 0 0 3px rgba(76, 159, 224, .32);
}

/* El logo del login lleva texto negro sobre fondo transparente: en oscuro se
   pierde. Se le pone un respaldo blanco (no filtros: el logo es bicolor). */
:root[data-theme="dark"] .login-logo {
  background: #FFFFFF;
  border-radius: 12px;
  padding: 12px 16px;
}

/* Botón de tema: el ícono visible depende del tema activo. */
.theme-btn .icon-moon { display: none; }
.theme-btn .icon-sun  { display: block; }
:root[data-theme="dark"] .theme-btn .icon-sun  { display: none; }
:root[data-theme="dark"] .theme-btn .icon-moon { display: block; }

* { box-sizing: border-box; margin: 0; padding: 0; }

[hidden] { display: none !important; }

html, body { height: 100%; }

body {
  font-family: var(--font-body);
  background: var(--paper);
  background-image: radial-gradient(120% 85% at 50% -12%, var(--bg-tint) 0%, var(--paper) 58%);
  background-attachment: fixed;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1;
  line-height: 1.55;
}

.app {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  max-width: 920px;
  margin: 0 auto;
  background: var(--surface-elevated);
  box-shadow: var(--shadow-lg);
}

/* ---------- Encabezado ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 24px;
  border-bottom: 1px solid var(--line);
  background: var(--topbar-bg);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
}

.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }

/* Botón de menú (abre el panel de conversaciones) — variante fantasma */
.menu-btn { border-color: transparent; background: transparent; }
.menu-btn:hover { background: var(--udd-blue-light); border-color: transparent; color: var(--udd-blue); }

.brand-mark {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: var(--logo-bg);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
/* Fallback si el monograma no carga: círculo azul UDD */
.brand-mark:not(:has(.brand-logo)) {
  background: radial-gradient(circle at 32% 30%, var(--udd-blue), var(--udd-blue-dark) 80%);
  border-color: transparent;
}
.brand-logo {
  width: 78%;
  height: 78%;
  object-fit: contain;
  display: block;
}

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
}
.brand-sub { font-size: .76rem; color: var(--ink-soft); }

.status {
  display: flex; align-items: center; gap: 7px;
  font-size: .76rem; color: var(--ink-soft);
}
.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--line);
  transition: background .3s;
}
.status-dot.ok   { background: var(--ok); }
.status-dot.err  { background: var(--err); }
.status-dot.warn { background: var(--warn); }

/* Aviso sutil: la conversación no se guarda */
.session-note {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: .72rem;
  color: var(--ink-soft);
  background: var(--udd-blue-light);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 10px;
  cursor: default;
  white-space: nowrap;
}
.session-note svg { color: var(--udd-blue); opacity: .85; flex-shrink: 0; }

/* Botón de ícono (menú, cerrar drawer, tema) */
.icon-btn {
  display: grid;
  place-items: center;
  width: 32px; height: 32px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface-elevated);
  color: var(--ink-soft);
  cursor: pointer;
  flex-shrink: 0;
  transition: color .18s, border-color .18s, background .18s, box-shadow .18s;
}
.icon-btn:hover { color: var(--udd-blue); border-color: var(--udd-blue); }
.icon-btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }

/* ---------- Conversación ---------- */
.conversation {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 32px 24px 8px;
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.conversation::-webkit-scrollbar { width: 11px; }
.conversation::-webkit-scrollbar-track { background: transparent; }
.conversation::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 999px;
  border: 3px solid var(--surface-elevated);
}
.conversation::-webkit-scrollbar-thumb:hover { background: var(--scroll-thumb-hover); }

.welcome {
  max-width: var(--maxw);
  margin: 6vh auto 0;
  padding: 0 4px;
  animation: rise .6s ease both;
}
.welcome-eyebrow {
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .16em;
  color: var(--udd-blue);
  font-weight: 600;
  margin-bottom: 14px;
}
/* Único acento dorado del área principal: fina línea bajo el "eyebrow". */
.welcome-eyebrow::after {
  content: "";
  display: block;
  width: 32px; height: 2px;
  margin-top: 8px;
  border-radius: 2px;
  background: var(--gold);
}
.welcome-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.7rem, 4.4vw, 2.5rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.welcome-body {
  font-size: 1rem;
  color: var(--ink-soft);
  max-width: 52ch;
  margin-bottom: 28px;
}

.suggestions { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  font-family: var(--font-body);
  font-size: .86rem;
  color: var(--ink);
  background: var(--udd-blue-light);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 16px;
  cursor: pointer;
  transition: all .18s ease;
  animation: rise .5s ease both;
}
/* Entrada escalonada de los chips de sugerencia. */
.chip:nth-child(1) { animation-delay: .06s; }
.chip:nth-child(2) { animation-delay: .14s; }
.chip:nth-child(3) { animation-delay: .22s; }
.chip:hover { border-color: var(--udd-blue); color: var(--udd-blue); transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.chip:active { transform: translateY(0) scale(.98); }
.chip:focus-visible { outline: none; box-shadow: var(--focus-ring); }

/* Mensajes */
.msg {
  max-width: var(--maxw);
  margin: 0 auto 22px;
  display: flex;
  animation: rise .35s ease both;
}
.msg-row { display: flex; gap: 12px; width: 100%; }

.msg.user { justify-content: flex-end; }
.msg.user .bubble {
  background: var(--user-bubble);
  color: var(--user-text);
  border-radius: 16px 16px 4px 16px;
  padding: 12px 16px;
  max-width: 80%;
}

.msg.mentor .avatar {
  width: 30px; height: 30px; border-radius: 50%; flex-shrink: 0;
  display: grid; place-items: center;
  overflow: hidden;
  background: var(--logo-bg);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  margin-top: 1px;
}
.msg.mentor .avatar .brand-logo { width: 76%; height: 76%; object-fit: contain; }
.msg.mentor .avatar.avatar--fallback {
  background: radial-gradient(circle at 32% 30%, var(--udd-blue), var(--udd-blue-dark) 80%);
  border-color: transparent;
}

.msg-content { display: flex; flex-direction: column; min-width: 0; flex: 1; }

.sender {
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--udd-blue-dark);
  margin: 2px 0 4px;
}

.msg.mentor .bubble {
  background: transparent;
  padding: 0;
  font-size: 1.02rem;
  color: var(--ink);
}
.msg.mentor .bubble p { margin-bottom: 12px; }
.msg.mentor .bubble p:last-child { margin-bottom: 0; }
.msg.mentor .bubble strong { font-weight: 600; }
.msg.mentor .bubble em { font-style: italic; color: var(--ink-soft); }

/* Markdown enriquecido (listas, código, enlaces) dentro de la respuesta. */
.msg.mentor .bubble ul,
.msg.mentor .bubble ol { margin: 0 0 12px; padding-left: 22px; }
.msg.mentor .bubble ul:last-child,
.msg.mentor .bubble ol:last-child { margin-bottom: 0; }
.msg.mentor .bubble li { margin-bottom: 6px; }
.msg.mentor .bubble li:last-child { margin-bottom: 0; }
.msg.mentor .bubble li::marker { color: var(--udd-blue); }
.msg.mentor .bubble code {
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: .9em;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1px 6px;
}
.msg.mentor .bubble a {
  color: var(--udd-blue);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color .15s;
}
.msg.mentor .bubble a:hover { color: var(--udd-blue-dark); }

/* Acciones por mensaje (copiar) — discretas, se revelan al pasar el mouse */
.msg-actions { margin-top: 9px; min-height: 26px; }
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-body);
  font-size: .74rem;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 4px 9px;
  cursor: pointer;
  opacity: 0;
  transition: opacity .16s, color .16s, border-color .16s, background .16s, transform .16s;
}
.msg.mentor:hover .copy-btn,
.msg.mentor:focus-within .copy-btn,
.copy-btn:focus-visible,
.copy-btn.copied { opacity: 1; }
.copy-btn:hover { color: var(--udd-blue); border-color: var(--udd-blue); background: var(--udd-blue-light); transform: translateY(-1px); }
.copy-btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.copy-btn.copied { color: var(--ok); border-color: var(--ok); }
@media (hover: none) { .copy-btn { opacity: 1; } }

/* Indicador de "pensando" */
.thinking { display: inline-flex; gap: 5px; padding: 6px 0; }
.thinking span {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--udd-blue);
  opacity: .4;
  animation: pulse 1.2s infinite ease-in-out;
}
.thinking span:nth-child(2) { animation-delay: .2s; }
.thinking span:nth-child(3) { animation-delay: .4s; }
/* Etiqueta de estado junto a los puntos ("Reintentando…"). Anula el estilo
   de puntito que .thinking span le daría al span de texto. */
.thinking .thinking-label {
  width: auto; height: auto;
  border-radius: 0;
  background: none;
  opacity: 1;
  animation: rise .25s ease both;
  font-size: .78rem;
  color: var(--ink-soft);
  margin-left: 4px;
  align-self: center;
}

/* ---------- Entrada ---------- */
.composer {
  padding: 12px 24px 18px;
  border-top: 1px solid var(--line);
  background: var(--surface-elevated);
}
.composer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 8px 8px 8px 16px;
  box-shadow: var(--shadow-sm);
  transition: border-color .2s, box-shadow .2s;
}
.composer-inner:focus-within { border-color: var(--udd-blue); box-shadow: var(--focus-ring); }

#input {
  flex: 1;
  border: none;
  background: transparent;
  resize: none;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink);
  line-height: 1.5;
  max-height: 180px;
  padding: 6px 0;
}
#input:focus { outline: none; }
#input::placeholder { color: var(--ink-soft); }

.send {
  width: 40px; height: 40px;
  border: none;
  border-radius: 12px;
  background: var(--udd-blue);
  color: var(--on-accent);
  display: grid;
  place-items: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: background .18s, transform .18s, opacity .18s;
}
.send:hover:not(:disabled) { background: var(--udd-blue-dark); transform: translateY(-1px); }
.send:active:not(:disabled) { transform: scale(.94); }
.send:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.send:disabled { opacity: .4; cursor: not-allowed; }

.composer-note {
  max-width: var(--maxw);
  margin: 8px auto 0;
  font-size: .72rem;
  color: var(--ink-soft);
  text-align: center;
}

/* Botón flotante: ir al final de la conversación */
.scroll-bottom {
  position: absolute;
  right: 22px;
  bottom: 112px;
  z-index: 4;
  width: 40px; height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface-elevated);
  color: var(--udd-blue);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  animation: rise .25s ease both;
  transition: transform .18s, box-shadow .18s, color .18s, border-color .18s;
}
.scroll-bottom:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--udd-blue); }
.scroll-bottom:focus-visible { outline: none; box-shadow: var(--focus-ring); }

/* ---------- Inicio de sesión ---------- */
.login {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--paper);
  background-image: radial-gradient(120% 85% at 50% -12%, var(--bg-tint) 0%, var(--paper) 58%);
  z-index: 10;
}
.login-card {
  width: 100%;
  max-width: 380px;
  background: var(--surface-elevated);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 34px 30px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  animation: rise .5s ease both;
}
.login-logo {
  display: block;
  width: auto;
  max-width: 220px;
  height: auto;
  margin: 4px auto 22px;
}
.login-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.3rem;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}
.login-sub {
  font-size: .82rem;
  color: var(--ink-soft);
  margin-bottom: 22px;
}
.login-field { text-align: left; margin-bottom: 14px; }
.login-field label {
  display: block;
  font-size: .76rem;
  color: var(--ink-soft);
  margin-bottom: 5px;
}
.login-field input {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 13px;
  transition: border-color .18s;
}
.login-field input:focus { outline: none; border-color: var(--udd-blue); box-shadow: var(--focus-ring); }
.login-btn {
  width: 100%;
  margin-top: 6px;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  color: var(--on-accent);
  background: var(--udd-blue);
  border: none;
  border-radius: 10px;
  padding: 12px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background .18s, box-shadow .18s, transform .18s;
}
.login-btn:hover:not(:disabled) { background: var(--udd-blue-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.login-btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.login-btn:disabled { opacity: .6; cursor: not-allowed; }
.login-error {
  min-height: 1.2em;
  margin-top: 12px;
  font-size: .82rem;
  color: var(--err);
}
.login-note {
  margin-top: 18px;
  font-size: .7rem;
  color: var(--ink-soft);
}

/* Chip de usuario + salir (en el encabezado) */
.topbar-right { display: flex; align-items: center; gap: 12px; }
.user-chip {
  font-size: .76rem;
  font-weight: 500;
  color: var(--udd-blue-dark);
  background: var(--udd-blue-light);
  border-radius: 999px;
  padding: 4px 11px;
}
.logout {
  font-family: var(--font-body);
  font-size: .76rem;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 12px;
  cursor: pointer;
  transition: border-color .18s, color .18s;
}
.logout:hover { border-color: var(--udd-blue); color: var(--udd-blue); }

/* ---------- Drawer de conversaciones ---------- */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: var(--backdrop);
  opacity: 0;
  pointer-events: none;
  transition: opacity .22s ease;
  z-index: 15;
}
.drawer-backdrop.open { opacity: 1; pointer-events: auto; }

.drawer {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: 300px;
  max-width: 84vw;
  display: flex;
  flex-direction: column;
  background: var(--surface-elevated);
  border-right: 1px solid var(--line);
  box-shadow: var(--shadow-lg);
  transform: translateX(-100%);
  transition: transform .22s ease;
  z-index: 20;
}
.drawer.open { transform: translateX(0); }

.drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--line);
}
.drawer-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
}

.drawer-new {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 14px 16px 8px;
  padding: 10px 14px;
  font-family: var(--font-body);
  font-size: .9rem;
  font-weight: 500;
  color: var(--on-accent);
  background: var(--udd-blue);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background .18s, box-shadow .18s, transform .18s;
}
.drawer-new:hover { background: var(--udd-blue-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.drawer-new:focus-visible { outline: none; box-shadow: var(--focus-ring); }

.drawer-list {
  flex: 1;
  overflow-y: auto;
  padding: 6px 10px 10px;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.conv-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  border-radius: 10px;
  cursor: pointer;
  transition: background .15s, transform .12s, box-shadow .15s;
}
.conv-item:hover { background: var(--surface); }
.conv-item:active { transform: scale(.99); }
.conv-item.active { background: var(--udd-blue-light); box-shadow: inset 3px 0 0 var(--udd-blue); }
.conv-main { flex: 1; min-width: 0; }
.conv-title {
  font-size: .88rem;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.conv-item.active .conv-title { color: var(--udd-blue-dark); font-weight: 500; }
.conv-time { font-size: .7rem; color: var(--ink-soft); margin-top: 2px; }
.conv-del {
  flex-shrink: 0;
  display: grid; place-items: center;
  width: 26px; height: 26px;
  border: none;
  border-radius: 7px;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  opacity: 0;
  transition: opacity .15s, color .15s, background .15s;
}
.conv-item:hover .conv-del, .conv-item.active .conv-del { opacity: 1; }
.conv-del:hover { color: var(--err); background: var(--danger-soft); }
.conv-del:focus-visible { outline: none; box-shadow: var(--focus-ring); opacity: 1; }
@media (hover: none) { .conv-del { opacity: 1; } }

.drawer-empty {
  padding: 18px 12px;
  font-size: .82rem;
  color: var(--ink-soft);
  text-align: center;
}
.drawer-note {
  padding: 12px 16px 16px;
  border-top: 1px solid var(--line);
  font-size: .7rem;
  color: var(--ink-soft);
  line-height: 1.4;
}

/* ---------- Animaciones ---------- */
@keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse { 0%, 60%, 100% { opacity: .3; transform: scale(.85); } 30% { opacity: 1; transform: scale(1); } }

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

/* Escritorio ancho: el panel de conversaciones queda fijo como barra lateral
   (sin superponerse). Solo CSS: el JS de abrir/cerrar drawer queda neutralizado
   por position:static + transform:none, y refreshDrawer() ya mantiene la lista
   al día en cada cambio. */
@media (min-width: 1200px) {
  .app {
    max-width: 1380px;
    display: grid;
    grid-template-columns: 300px minmax(0, 1fr);
    grid-template-rows: auto 1fr auto;
  }
  .topbar       { grid-column: 2; grid-row: 1; }
  .conversation { grid-column: 2; grid-row: 2; min-height: 0; }
  .composer     { grid-column: 2; grid-row: 3; }
  .drawer {
    grid-column: 1;
    grid-row: 1 / -1;
    position: static;
    width: auto;
    max-width: none;
    transform: none;
    box-shadow: none;
    border-right: 1px solid var(--line);
    z-index: auto;
  }
  .drawer-list { min-height: 0; }
  .drawer-backdrop { display: none; }
  .menu-btn, #drawerCloseBtn { display: none; }
  :root { --maxw: 820px; }
}

/* Tablet: contenido algo más angosto y aire lateral. */
@media (max-width: 900px) {
  :root { --maxw: 680px; }
  .conversation { padding: 28px 20px 8px; }
}

@media (max-width: 600px) {
  .topbar { padding: 12px 14px; gap: 8px; }
  .topbar-right { gap: 8px; }
  .brand-sub { display: none; }
  .session-note-text { display: none; }
  .session-note { padding: 5px 7px; }
  #statusText { display: none; }
  .status { gap: 0; }
  .conversation { padding: 24px 16px 8px; }
  .composer { padding: 10px 16px 16px; }
  .welcome { margin-top: 3vh; }
  .scroll-bottom { right: 16px; bottom: 104px; }
}
@media (max-width: 460px) {
  /* En pantallas muy angostas priorizamos el chat: se ocultan el aviso
     "Temporal" y el chip de usuario (queda visible "Salir", que es la acción). */
  .session-note { display: none; }
  .user-chip { display: none; }
}
