/* ════════════════════════════════════════════════════════════
   WwBd · What would Buddha do?
   Tratado sereno · claro, con aire · acento naranja + azul suave
   ════════════════════════════════════════════════════════════ */

:root {
  /* base marfil / blanco */
  --paper:        #fbf7ef;
  --paper-2:      #f4ede0;
  --paper-glow:   #fefcf7;
  /* tinta cálida */
  --ink:          #3a342c;
  --ink-soft:     #6b6155;
  --ink-faint:    #a79c8c;
  /* acentos */
  --orange:       #e8833a;
  --orange-deep:  #cf6f2c;
  --blue:         #7fb0d4;
  --blue-deep:    #5e93ba;
  --line:         #e7ddcc;

  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans:  "Inter", system-ui, sans-serif;

  --maxw: 44rem;
  --rail: 4.5rem;

  /* fluid type */
  --step--1: clamp(0.82rem, 0.78rem + 0.2vw, 0.92rem);
  --step-0:  clamp(1.04rem, 0.98rem + 0.3vw, 1.18rem);
  --step-1:  clamp(1.4rem, 1.25rem + 0.7vw, 1.85rem);
  --step-2:  clamp(2rem, 1.6rem + 1.9vw, 3rem);
  --step-hero: clamp(3.4rem, 2.4rem + 5vw, 6.5rem);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  font-weight: 300;
  font-size: var(--step-0);
  line-height: 1.72;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* ───────── fondo que respira ───────── */
.atmosphere {
  position: fixed;
  inset: -20vmax;
  z-index: -1;
  background:
    radial-gradient(40% 50% at 22% 18%, rgba(232,131,58,0.10), transparent 70%),
    radial-gradient(45% 55% at 82% 30%, rgba(127,176,212,0.12), transparent 72%),
    radial-gradient(60% 60% at 50% 100%, rgba(232,131,58,0.06), transparent 75%),
    linear-gradient(180deg, var(--paper-glow), var(--paper) 45%, var(--paper-2));
  background-size: 140% 140%, 150% 150%, 130% 130%, 100% 100%;
  animation: drift 34s ease-in-out infinite alternate;
  will-change: background-position;
}
@keyframes drift {
  0%   { background-position: 0% 0%, 100% 0%, 50% 100%, center; }
  50%  { background-position: 30% 20%, 70% 30%, 40% 80%, center; }
  100% { background-position: 10% 40%, 90% 10%, 60% 90%, center; }
}

/* ───────── rail ───────── */
.rail {
  position: fixed;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  z-index: 40;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 0.9rem 0.6rem;
  width: var(--rail);
  align-items: center;
}
.rail a {
  position: relative;
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  font-family: var(--serif);
  font-size: 0.8rem;
  color: var(--ink-faint);
  text-decoration: none;
  border-radius: 50%;
  transition: color .4s ease, background .4s ease;
}
.rail a::after {
  content: attr(data-label);
  position: absolute;
  left: calc(100% + 0.5rem);
  white-space: nowrap;
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  background: var(--paper-glow);
  padding: 0.18rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  opacity: 0;
  pointer-events: none;
  transform: translateX(-4px);
  transition: opacity .3s ease, transform .3s ease;
}
.rail a:hover,
.rail a.active {
  color: var(--orange-deep);
  background: rgba(232,131,58,0.08);
}
.rail a:hover::after { opacity: 1; transform: translateX(0); }
.rail a.active::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1.5px solid var(--orange);
  opacity: 0.55;
}

/* ───────── layout base de secciones ───────── */
main { position: relative; }

section {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.movement,
.chat-section {
  padding-block: clamp(5rem, 12vh, 9rem);
  border-top: 1px solid var(--line);
}

.numeral {
  display: block;
  font-family: var(--serif);
  font-style: italic;
  font-size: var(--step-1);
  color: var(--orange);
  opacity: 0.85;
  margin-bottom: 0.4rem;
  letter-spacing: 0.04em;
}

h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: var(--step-2);
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 0 0 1.1rem;
  color: var(--ink);
}

.lede {
  font-family: var(--serif);
  font-style: italic;
  font-size: var(--step-1);
  color: var(--blue-deep);
  line-height: 1.4;
  margin: 0 0 1.4rem;
  max-width: 34ch;
}

.prose { color: var(--ink-soft); margin: 0; }

.factcheck { margin-top: 2rem; }

/* ───────── portada ───────── */
.portada {
  min-height: 100svh;
  display: grid;
  place-items: center;
  text-align: center;
  position: relative;
  padding-block: 6rem;
}
.portada-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.enso-wrap {
  color: var(--orange);
  width: clamp(11rem, 26vw, 17rem);
  margin-bottom: 1.6rem;
}
.enso {
  width: 100%;
  height: auto;
  display: block;
  filter: drop-shadow(0 4px 18px rgba(232,131,58,0.18));
  transform-origin: center;
  animation: breathe 9s ease-in-out infinite;
}
@keyframes breathe {
  0%, 100% { transform: scale(0.97); opacity: 0.82; }
  50%      { transform: scale(1.03); opacity: 1; }
}

.title {
  font-family: var(--serif);
  font-weight: 300;
  font-size: var(--step-hero);
  line-height: 0.9;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--ink);
}
.subtitle {
  font-family: var(--serif);
  font-size: var(--step-1);
  color: var(--blue-deep);
  margin: 0.3rem 0 0;
}
.gesture {
  font-family: var(--serif);
  font-style: italic;
  font-size: var(--step-0);
  color: var(--ink-soft);
  line-height: 1.6;
  margin: 1.8rem 0 0;
}
.gesture span { color: var(--orange-deep); }

.cta {
  margin-top: 2.4rem;
  display: inline-block;
  font-family: var(--sans);
  font-size: var(--step--1);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  padding: 0.7rem 1.6rem;
  border: 1px solid var(--orange);
  border-radius: 999px;
  transition: background .35s ease, color .35s ease, transform .35s ease;
}
.cta:hover {
  background: var(--orange);
  color: var(--paper-glow);
  transform: translateY(-2px);
}

.scroll-hint {
  position: absolute;
  bottom: 2.2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--ink-faint);
  text-decoration: none;
  font-size: 1.3rem;
  animation: bob 2.6s ease-in-out infinite;
}
@keyframes bob {
  0%, 100% { transform: translate(-50%, 0); opacity: 0.5; }
  50%      { transform: translate(-50%, 6px); opacity: 1; }
}

/* ───────── citas inline ───────── */
.cite {
  display: inline-flex;
  align-items: baseline;
  gap: 0.22em;
  font-family: var(--sans);
  font-size: 0.86em;
  color: var(--blue-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(127,176,212,0.45);
  padding: 0 0.12em;
  transition: color .3s ease, border-color .3s ease;
  white-space: nowrap;
}
.cite:hover { color: var(--orange-deep); border-color: var(--orange); }
.cite .arrow { font-size: 0.85em; }
.cite-dead {
  color: var(--ink-faint);
  font-size: 0.86em;
  opacity: 0.6;
}

/* ───────── chat ───────── */
.chat {
  margin-top: 2rem;
}
.messages {
  list-style: none;
  margin: 0 0 1.4rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.messages:empty { margin-bottom: 0; }

.msg {
  max-width: 88%;
  padding: 0.9rem 1.2rem;
  border-radius: 1.1rem;
  line-height: 1.62;
  animation: rise .5s ease both;
}
@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.msg.user {
  align-self: flex-end;
  background: rgba(127,176,212,0.16);
  border: 1px solid rgba(127,176,212,0.35);
  color: var(--ink);
  border-bottom-right-radius: 0.3rem;
}
.msg.master {
  align-self: flex-start;
  background: var(--paper-glow);
  border: 1px solid var(--line);
  border-bottom-left-radius: 0.3rem;
}
.msg .role {
  display: block;
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.8rem;
  color: var(--ink-faint);
  margin-bottom: 0.25rem;
}
.msg.master .role { color: var(--orange); }
.msg p { margin: 0.4em 0; }
.msg p:first-of-type { margin-top: 0; }
.msg p:last-child { margin-bottom: 0; }
.msg .body > :first-child { margin-top: 0; }
.msg .body > :last-child { margin-bottom: 0; }
.msg strong { font-weight: 500; color: var(--ink); }
.msg ul {
  margin: 0.5em 0;
  padding-left: 1.1em;
  list-style: none;
}
.msg ul li {
  position: relative;
  margin: 0.28em 0;
  padding-left: 0.2em;
}
.msg ul li::before {
  content: "·";
  position: absolute;
  left: -0.85em;
  color: var(--orange);
  font-weight: 600;
}

/* indicador "pensando" */
.thinking {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink-faint);
}
.thinking .enso-small {
  width: 1.4rem;
  height: 1.4rem;
  color: var(--orange);
  animation: breathe 2.6s ease-in-out infinite, spin 5s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.msg.error {
  align-self: stretch;
  max-width: 100%;
  text-align: center;
  background: rgba(232,131,58,0.07);
  border: 1px solid rgba(232,131,58,0.3);
  color: var(--ink-soft);
  font-family: var(--serif);
  font-style: italic;
}

/* sugerencias */
.suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 1rem;
}
.chip-q {
  font-family: var(--sans);
  font-size: var(--step--1);
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.95rem;
  cursor: pointer;
  transition: border-color .3s ease, color .3s ease, background .3s ease;
}
.chip-q:hover {
  border-color: var(--blue);
  color: var(--blue-deep);
  background: rgba(127,176,212,0.08);
}

/* composer */
.composer {
  display: flex;
  align-items: flex-end;
  gap: 0.6rem;
  background: var(--paper-glow);
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  padding: 0.6rem 0.6rem 0.6rem 1.1rem;
  transition: border-color .3s ease, box-shadow .3s ease;
}
.composer:focus-within {
  border-color: var(--orange);
  box-shadow: 0 0 0 3px rgba(232,131,58,0.1);
}
#input {
  flex: 1;
  border: none;
  background: transparent;
  resize: none;
  font-family: var(--sans);
  font-size: var(--step-0);
  font-weight: 300;
  color: var(--ink);
  line-height: 1.5;
  max-height: 9rem;
  padding: 0.45rem 0;
}
#input:focus { outline: none; }
#input::placeholder { color: var(--ink-faint); }

#send {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
  font-family: var(--sans);
  font-size: var(--step--1);
  letter-spacing: 0.04em;
  color: var(--paper-glow);
  background: var(--orange);
  border: none;
  border-radius: 999px;
  padding: 0.55rem 1.1rem;
  cursor: pointer;
  transition: background .3s ease, transform .2s ease, opacity .3s ease;
}
#send:hover { background: var(--orange-deep); transform: translateY(-1px); }
#send:disabled { opacity: 0.5; cursor: default; transform: none; }
#send .enso-small { width: 1.05rem; height: 1.05rem; display: none; }
#send.busy .send-label { display: none; }
#send.busy .enso-small { display: block; animation: spin 4s linear infinite; }

/* ───────── colofón ───────── */
.colophon {
  text-align: center;
  padding: 3rem 1.5rem 4rem;
  color: var(--ink-faint);
  font-size: var(--step--1);
  border-top: 1px solid var(--line);
}
.colophon a { color: var(--blue-deep); text-decoration: none; }
.colophon a:hover { color: var(--orange-deep); }

/* ───────── responsive ───────── */
@media (max-width: 720px) {
  .rail { display: none; }
  section { padding-inline: 1.25rem; }
  .msg { max-width: 95%; }
  #send .send-label { display: inline; }
}

/* ───────── prefers-reduced-motion ───────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .atmosphere { animation: none; }
  .enso { animation: none; transform: scale(1); opacity: 1; }
  .scroll-hint { animation: none; }
  .thinking .enso-small,
  #send .enso-small { animation: none; }
  .msg { animation: none; }
}