/* Coli: estilo Claude (fondo marfil, serif en las respuestas) con la marca naranja del logo. */
:root {
  --fondo: #FAF9F5;
  --superficie: #FFFFFF;
  --panel: #F3F1EA;
  --texto: #1F1E1D;
  --texto-2: #6F6C64;
  --texto-3: #9C988E;
  --borde: #E6E2D6;
  --borde-fuerte: #D6D1C2;
  --burbuja: #EFEBE1;
  --hover: rgba(31, 30, 29, .055);
  --marca: #F07A1A;
  --marca-oscura: #D9541A;
  --degradado: linear-gradient(135deg, #F9A11B 0%, #F07A1A 52%, #E5481A 100%);
  --marca-suave: rgba(240, 122, 26, .12);
  --error: #C2410C;
  --sombra: 0 1px 2px rgba(31, 30, 29, .04), 0 6px 22px rgba(31, 30, 29, .07);
  --serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, monospace;
  --app-h: 100dvh;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fondo: #262624;
    --superficie: #30302E;
    --panel: #1F1E1D;
    --texto: #F3F1EA;
    --texto-2: #ABA79C;
    --texto-3: #7E7A70;
    --borde: #3C3B37;
    --borde-fuerte: #4C4A44;
    --burbuja: #141413;
    --hover: rgba(255, 255, 255, .06);
    --marca-oscura: #F59A4A;
    --marca-suave: rgba(240, 122, 26, .18);
    --error: #F28B5B;
    --sombra: 0 1px 2px rgba(0, 0, 0, .2), 0 8px 26px rgba(0, 0, 0, .3);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--fondo);
  color: var(--texto);
  font-family: var(--sans);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}
[hidden] { display: none !important; }
button { font: inherit; color: inherit; cursor: pointer; }
svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; flex: none; }

.icono-btn {
  width: 40px; height: 40px; display: grid; place-items: center;
  border: 0; border-radius: 12px; background: none; color: var(--texto-2);
}
.icono-btn:hover { background: var(--hover); color: var(--texto); }
.icono-btn:active { transform: scale(.94); }

/* ---------- entrar ---------- */
.entrar {
  position: fixed; inset: 0; display: grid; place-items: center; padding: 24px;
  background:
    radial-gradient(120% 60% at 50% -10%, rgba(249, 161, 27, .16), transparent 60%),
    var(--fondo);
}
.entrar-caja { width: 100%; max-width: 340px; text-align: center; animation: subir .5s ease both; }
.entrar-logo { width: 88px; height: 88px; filter: drop-shadow(0 10px 24px rgba(229, 72, 26, .28)); }
.entrar-titulo { font-family: var(--serif); font-weight: 500; font-size: 42px; letter-spacing: -.01em; margin: 18px 0 2px; }
.entrar-sub { margin: 0; color: var(--texto-2); }
.entrar-form { margin-top: 30px; display: grid; gap: 10px; }
.entrar-form input {
  height: 52px; border-radius: 14px; border: 1px solid var(--borde); background: var(--superficie);
  padding: 0 16px; font: inherit; font-size: 16px; color: var(--texto); outline: none; text-align: center;
  transition: border-color .15s, box-shadow .15s;
}
.entrar-form input:focus { border-color: var(--marca); box-shadow: 0 0 0 4px var(--marca-suave); }
.boton-marca {
  height: 52px; border: 0; border-radius: 14px; background: var(--degradado); color: #fff;
  font-weight: 600; font-size: 16px; box-shadow: 0 8px 20px rgba(240, 122, 26, .28);
  transition: transform .1s, filter .15s;
}
.boton-marca:hover { filter: brightness(1.04); }
.boton-marca:active { transform: scale(.98); }
.boton-marca:disabled { opacity: .6; }
.entrar-error { margin: 4px 0 0; min-height: 1.3em; color: var(--error); font-size: 14px; }

/* ---------- estructura ---------- */
.app { position: fixed; top: 0; left: 0; right: 0; height: var(--app-h); display: flex; overflow: hidden; }
.principal { flex: 1; min-width: 0; display: flex; flex-direction: column; height: 100%; }

.barra {
  display: grid; grid-template-columns: 44px 1fr 44px; align-items: center;
  padding: calc(6px + env(safe-area-inset-top)) 8px 6px; flex: none;
}
.barra-titulo {
  text-align: center; font-weight: 500; font-size: 15px; color: var(--texto);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; padding: 0 6px;
}

/* ---------- panel lateral ---------- */
.panel {
  position: fixed; top: 0; bottom: 0; left: 0; z-index: 30;
  width: min(86vw, 320px); background: var(--panel);
  display: flex; flex-direction: column;
  transform: translateX(-102%); transition: transform .28s cubic-bezier(.3, .7, .2, 1);
  padding-left: env(safe-area-inset-left);
}
.app.panel-abierto .panel { transform: none; box-shadow: 0 0 40px rgba(0, 0, 0, .18); }
.velo {
  position: fixed; inset: 0; z-index: 20; background: rgba(20, 20, 19, .34);
  opacity: 0; pointer-events: none; transition: opacity .28s;
}
.app.panel-abierto .velo { opacity: 1; pointer-events: auto; }

.panel-cabeza {
  display: flex; align-items: center; justify-content: space-between;
  padding: calc(12px + env(safe-area-inset-top)) 10px 8px 18px;
}
.marca { display: flex; align-items: center; gap: 10px; }
.marca img { width: 28px; height: 28px; }
.marca span { font-family: var(--serif); font-size: 23px; font-weight: 500; letter-spacing: -.01em; }

.nuevo-chat {
  margin: 8px 12px 14px; height: 44px; padding: 0 12px; border-radius: 12px;
  display: flex; align-items: center; gap: 10px; font-weight: 500; font-size: 15px;
  border: 1px solid var(--borde); background: var(--superficie); box-shadow: 0 1px 2px rgba(0, 0, 0, .04);
}
.nuevo-chat:hover { border-color: var(--borde-fuerte); }
.nuevo-chat-icono {
  width: 24px; height: 24px; border-radius: 50%; background: var(--degradado); color: #fff;
  display: grid; place-items: center;
}
.nuevo-chat-icono svg { width: 15px; height: 15px; stroke-width: 2.6; }

.panel-titulo { margin: 0; padding: 0 22px 6px; font-size: 12.5px; font-weight: 500; color: var(--texto-3); }
.lista-chats { flex: 1; overflow-y: auto; padding: 0 8px 8px; }
.lista-vacia { margin: 6px 14px; font-size: 14px; color: var(--texto-3); line-height: 1.45; }
.chat-item { display: flex; align-items: center; border-radius: 10px; min-height: 40px; }
.chat-item:hover, .chat-item.activo { background: var(--hover); }
.chat-abrir {
  flex: 1; min-width: 0; text-align: left; border: 0; background: none; padding: 9px 12px;
  font-size: 14.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.chat-borrar { width: 34px; height: 34px; border: 0; background: none; color: var(--texto-3); display: grid; place-items: center; opacity: 0; border-radius: 8px; }
.chat-borrar svg { width: 17px; height: 17px; }
.chat-item.activo .chat-borrar, .chat-item:hover .chat-borrar { opacity: 1; }
.chat-borrar:hover { color: var(--error); }
.chat-item.confirmando { gap: 6px; padding: 4px 6px 4px 12px; background: var(--marca-suave); font-size: 14px; }
.chat-item.confirmando span { flex: 1; }
.confirmar-si, .confirmar-no { border: 0; border-radius: 8px; padding: 6px 10px; font-size: 13.5px; font-weight: 500; }
.confirmar-si { background: var(--error); color: #fff; }
.confirmar-no { background: var(--superficie); }

.panel-pie { border-top: 1px solid var(--borde); padding: 8px 10px calc(10px + env(safe-area-inset-bottom)); display: grid; gap: 2px; }
.pie-btn {
  display: flex; align-items: center; gap: 10px; width: 100%; text-align: left;
  border: 0; background: none; border-radius: 10px; padding: 10px 12px; font-size: 14.5px;
}
.pie-btn:hover { background: var(--hover); }
.pie-btn svg { color: var(--marca); }
.pie-btn span:first-of-type { flex: 1; }
.pildora { background: var(--marca-suave); color: var(--marca-oscura); font-size: 12px; font-weight: 600; padding: 2px 9px; border-radius: 99px; }
.pie-usuario { display: flex; align-items: center; gap: 10px; padding: 4px 4px 0 12px; }
.avatar {
  width: 30px; height: 30px; border-radius: 50%; background: var(--texto); color: var(--fondo);
  display: grid; place-items: center; font-size: 13px; font-weight: 600; flex: none;
}
.pie-nombre { flex: 1; font-size: 14.5px; font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- conversación ---------- */
.conversacion { flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch; padding: 4px 18px 28px; display: flex; flex-direction: column; }
.mensajes { width: 100%; max-width: 740px; margin: 0 auto; display: flex; flex-direction: column; gap: 26px; }
.mensajes:empty { display: none; }

.bienvenida {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 0 0 6vh; animation: subir .45s ease both;
}
.saludo { display: flex; align-items: center; justify-content: center; gap: 12px; flex-wrap: wrap; }
.saludo img { width: 40px; height: 40px; }
.saludo h1 { margin: 0; font-family: var(--serif); font-weight: 400; font-size: clamp(28px, 7.4vw, 38px); letter-spacing: -.015em; }
.saludo-sub { margin: 8px 0 0; color: var(--texto-2); font-size: 16px; }
.sugerencias { margin-top: 30px; width: 100%; max-width: 420px; display: grid; gap: 8px; }
.sugerencia {
  display: flex; align-items: center; gap: 12px; text-align: left; width: 100%;
  border: 1px solid var(--borde); background: var(--superficie); border-radius: 14px;
  padding: 13px 15px; font-size: 15px; transition: border-color .15s, transform .1s;
}
.sugerencia:hover { border-color: var(--borde-fuerte); }
.sugerencia:active { transform: scale(.985); }
.sugerencia svg { color: var(--marca); width: 19px; height: 19px; }

.msg { animation: aparecer .25s ease both; }
.msg-user {
  align-self: flex-end; max-width: 86%; background: var(--burbuja); border-radius: 20px;
  padding: 10px 16px; font-size: 16px; line-height: 1.5; white-space: pre-wrap; overflow-wrap: anywhere;
}
.msg-coli { font-family: var(--serif); font-size: 17.5px; line-height: 1.62; overflow-wrap: anywhere; }
.msg-coli .contenido > :first-child { margin-top: 0; }
.msg-coli .contenido > :last-child { margin-bottom: 0; }
.msg-coli p { margin: .65em 0; }
.msg-coli ul, .msg-coli ol { margin: .6em 0; padding-left: 1.35em; }
.msg-coli li { margin: .3em 0; }
.msg-coli li::marker { color: var(--texto-2); }
.msg-coli strong { font-weight: 600; }
.msg-coli h1, .msg-coli h2, .msg-coli h3, .msg-coli h4 { font-weight: 600; line-height: 1.3; margin: 1.1em 0 .4em; }
.msg-coli h1 { font-size: 1.3em; } .msg-coli h2 { font-size: 1.18em; } .msg-coli h3, .msg-coli h4 { font-size: 1.05em; }
.msg-coli a { color: var(--marca-oscura); }
.msg-coli code { font-family: var(--mono); font-size: .82em; background: var(--hover); padding: .12em .38em; border-radius: 6px; }
.msg-coli pre { background: var(--panel); border: 1px solid var(--borde); border-radius: 12px; padding: 12px 14px; overflow-x: auto; }
.msg-coli pre code { background: none; padding: 0; }
.msg-coli blockquote { margin: .8em 0; padding: .1em 0 .1em 14px; border-left: 3px solid var(--marca); color: var(--texto-2); }
.msg-coli hr { border: 0; border-top: 1px solid var(--borde); margin: 1.3em 0; }
.msg-coli table { display: block; overflow-x: auto; border-collapse: collapse; font-family: var(--sans); font-size: 14px; margin: .8em 0; }
.msg-coli th, .msg-coli td { border: 1px solid var(--borde); padding: 7px 10px; text-align: left; vertical-align: top; }
.msg-coli th { background: var(--panel); font-weight: 600; }
.cita {
  display: inline-block; font-family: var(--sans); font-size: 12.5px; font-weight: 500; line-height: 1.4;
  color: var(--marca-oscura); background: var(--marca-suave); border-radius: 7px; padding: 1px 8px; margin: 0 2px;
  vertical-align: 1px;
}

.pensando { display: flex; align-items: center; gap: 10px; font-family: var(--sans); font-size: 15px; }
.pensando img { width: 24px; height: 24px; animation: girar 1.6s cubic-bezier(.6, .1, .3, .9) infinite; }
.pensando span {
  background: linear-gradient(90deg, var(--texto-3) 0%, var(--texto) 45%, var(--texto-3) 90%);
  background-size: 220% 100%; -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: brillo 1.8s linear infinite;
}
.firma { display: flex; align-items: center; gap: 2px; margin-top: 10px; font-family: var(--sans); }
.firma img { width: 20px; height: 20px; margin-right: 8px; }
.firma .icono-btn { width: 34px; height: 34px; border-radius: 9px; color: var(--texto-3); }
.firma .icono-btn svg { width: 17px; height: 17px; }
.firma .icono-btn.hecho { color: var(--marca); }
.aviso { margin-top: 10px; font-family: var(--sans); font-size: 13.5px; color: var(--texto-2); }
.aviso.error {
  color: var(--error); background: var(--marca-suave); border-radius: 12px; padding: 10px 14px; font-size: 14.5px; line-height: 1.45;
}

/* ---------- redactor ---------- */
.redactor { flex: none; padding: 6px 12px calc(8px + env(safe-area-inset-bottom)); }
.redactor-caja {
  max-width: 740px; margin: 0 auto; display: flex; align-items: flex-end; gap: 8px;
  background: var(--superficie); border: 1px solid var(--borde); border-radius: 26px;
  padding: 7px 7px 7px 18px; box-shadow: var(--sombra); transition: border-color .15s;
}
.redactor-caja:focus-within { border-color: var(--borde-fuerte); }
.redactor textarea {
  flex: 1; border: 0; outline: 0; resize: none; background: transparent; color: var(--texto);
  font: inherit; font-size: 16px; line-height: 1.45; max-height: 168px; padding: 7px 0; min-height: 37px;
}
.redactor textarea::placeholder { color: var(--texto-3); }
.enviar {
  width: 38px; height: 38px; border-radius: 50%; border: 0; flex: none;
  display: grid; place-items: center; color: #fff; background: var(--degradado);
  box-shadow: 0 4px 12px rgba(240, 122, 26, .3); transition: transform .1s, background .2s, box-shadow .2s;
}
.enviar svg { width: 19px; height: 19px; stroke-width: 2.4; }
.enviar:active { transform: scale(.92); }
.enviar:disabled { background: var(--borde); color: var(--texto-3); box-shadow: none; cursor: default; }
.enviar .icono-detener { display: none; fill: currentColor; stroke: none; }
.enviar.detener { background: var(--texto); color: var(--fondo); box-shadow: none; }
.enviar.detener .icono-enviar { display: none; }
.enviar.detener .icono-detener { display: block; }
.redactor-nota { margin: 7px 0 0; text-align: center; font-size: 11.5px; color: var(--texto-3); }

/* ---------- hoja de lecciones ---------- */
.hoja {
  border: 0; padding: 0; width: min(92vw, 480px); max-height: 80vh; border-radius: 22px;
  background: var(--superficie); color: var(--texto); box-shadow: 0 20px 60px rgba(0, 0, 0, .25);
}
.hoja[open] { display: flex; flex-direction: column; animation: subir .25s ease both; }
.hoja::backdrop { background: rgba(20, 20, 19, .4); }
.hoja-cabeza { display: flex; align-items: center; justify-content: space-between; padding: 16px 12px 8px 22px; }
.hoja-cabeza h2 { margin: 0; font-family: var(--serif); font-weight: 500; font-size: 22px; }
.lista-lecciones { list-style: none; margin: 0; padding: 4px 14px 18px; overflow-y: auto; }
.lista-lecciones li { display: flex; gap: 12px; align-items: baseline; padding: 11px 8px; border-bottom: 1px solid var(--borde); font-size: 15px; line-height: 1.4; }
.lista-lecciones li:last-child { border-bottom: 0; }
.lista-lecciones .num { font-weight: 600; font-size: 12.5px; color: var(--marca-oscura); background: var(--marca-suave); border-radius: 7px; padding: 2px 7px; flex: none; }
.lista-lecciones .vacia { display: block; color: var(--texto-2); border: 0; text-align: center; padding: 18px 10px; }

@media (max-width: 600px) {
  .hoja { width: 100%; max-width: 100%; margin: auto 0 0; border-radius: 22px 22px 0 0; padding-bottom: env(safe-area-inset-bottom); }
}

/* ---------- computador: panel fijo ---------- */
@media (min-width: 900px) {
  .panel { position: static; transform: none; width: 280px; flex: none; border-right: 1px solid var(--borde); }
  .velo { display: none !important; }
  /* El botón del menú no se usa, pero guarda su espacio para que el título quede centrado. */
  .solo-movil { visibility: hidden; pointer-events: none; }
  .conversacion { padding-top: 12px; }
}

@keyframes subir { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@keyframes aparecer { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
@keyframes girar { to { transform: rotate(360deg); } }
@keyframes brillo { from { background-position: 120% 0; } to { background-position: -120% 0; } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}