/* ===== Paleta Auto Design AI ===== */
:root {
  --charcoal: #4F4F4F;   /* texto principal */
  --taupe: #8D7768;      /* acento cálido */
  --sand: #D2C7B4;       /* fondos suaves */
  --stone: #9B9C9B;      /* texto secundario, bordes */
  --teal: #043F3E;       /* color de marca */

  --cream: #F6F2EC;      /* derivado claro de --sand para fondos */
  --white: #FFFFFF;

  --font-serif: "Cormorant Garamond", Georgia, serif;
  --font-sans: "Inter", system-ui, sans-serif;

  --radius: 2px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  font-weight: 300;
  color: var(--charcoal);
  background: var(--cream);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

.container { width: min(1200px, 100% - 3rem); margin-inline: auto; }
.section { padding: clamp(5rem, 10vw, 8rem) 0; }
.section__head { text-align: center; max-width: 640px; margin: 0 auto 4rem; }

h1, h2, h3 { font-family: var(--font-serif); font-weight: 500; line-height: 1.1; color: var(--teal); }
h1 { font-size: clamp(2.8rem, 7vw, 5.5rem); }
h2 { font-size: clamp(2.2rem, 4.5vw, 3.4rem); margin-bottom: 1.5rem; }
h3 { font-size: 1.6rem; margin-bottom: .6rem; }
h1 em, h2 em { font-style: italic; color: var(--taupe); }
p + p { margin-top: 1rem; }

.eyebrow {
  font-size: .75rem; letter-spacing: .25em; text-transform: uppercase;
  color: var(--taupe); margin-bottom: 1.2rem; font-weight: 500;
}
.eyebrow--light { color: var(--sand); }

/* ===== Botones ===== */
.btn {
  display: inline-block; padding: 1rem 2.2rem; border: 1px solid var(--teal);
  background: var(--teal); color: var(--white); font-size: .8rem;
  letter-spacing: .15em; text-transform: uppercase; font-weight: 400;
  cursor: pointer; transition: all .35s var(--ease); border-radius: var(--radius);
  font-family: var(--font-sans);
}
.btn:hover { background: transparent; color: var(--teal); }
.btn--small { padding: .6rem 1.4rem; }
.btn--light { background: var(--cream); border-color: var(--cream); color: var(--teal); }
.btn--light:hover { background: transparent; color: var(--cream); }
.btn--ghost { background: transparent; border-color: var(--sand); color: var(--cream); }
.btn--ghost:hover { background: var(--sand); color: var(--teal); }
.btn--accent { background: var(--taupe); border-color: var(--taupe); }
.btn--accent:hover { background: transparent; color: var(--taupe); }
.btn--block { width: 100%; }

/* ===== Cabecera ===== */
.header {
  position: fixed; inset: 0 0 auto; z-index: 50; padding: 1.4rem 0;
  transition: background .4s var(--ease), padding .4s var(--ease), box-shadow .4s;
}
.header.is-scrolled { background: rgba(246, 242, 236, .96); padding: .8rem 0; box-shadow: 0 1px 0 rgba(79,79,79,.1); backdrop-filter: blur(8px); }
.header__inner { display: flex; align-items: center; justify-content: space-between; }

.logo { display: flex; align-items: center; gap: .75rem; color: var(--cream); transition: color .4s; }
.header.is-scrolled .logo { color: var(--teal); }
.logo__mark {
  width: 42px; height: 42px; display: grid; place-items: center;
  border: 1px solid currentColor; font-family: var(--font-serif); font-size: 1.1rem; letter-spacing: .05em;
}
.logo__text { font-family: var(--font-serif); font-size: 1.5rem; font-weight: 500; }
.logo__text em { color: var(--taupe); }
.logo--light { color: var(--cream); }

.nav { display: flex; align-items: center; gap: 2.2rem; }
.nav a { font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; color: var(--cream); position: relative; transition: color .4s; }
.nav a:not(.btn)::after {
  content: ""; position: absolute; left: 0; bottom: -4px; width: 0; height: 1px;
  background: var(--taupe); transition: width .35s var(--ease);
}
.nav a:not(.btn):hover::after { width: 100%; }
.header.is-scrolled .nav a:not(.btn) { color: var(--charcoal); }
.nav .btn { background: transparent; border-color: var(--cream); }
.header.is-scrolled .nav .btn { border-color: var(--teal); color: var(--teal); }
.header.is-scrolled .nav .btn:hover { background: var(--teal); color: var(--white); }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; width: 32px; height: 20px; position: relative; }
.nav-toggle span { position: absolute; left: 0; width: 100%; height: 1px; background: var(--cream); transition: .3s; }
.nav-toggle span:first-child { top: 4px; }
.nav-toggle span:last-child { bottom: 4px; }
.header.is-scrolled .nav-toggle span { background: var(--teal); }

/* ===== Hero ===== */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; color: var(--cream); overflow: hidden; }
.hero__bg {
  position: absolute; inset: 0;
  background:
    linear-gradient(100deg, rgba(4,63,62,.88) 0%, rgba(4,63,62,.55) 45%, rgba(79,79,79,.25) 100%),
    url("https://images.unsplash.com/photo-1618219908412-a29a1bb7b86e?w=1920&q=80") center/cover,
    var(--teal);
  animation: heroZoom 18s ease-out forwards;
}
@keyframes heroZoom { from { transform: scale(1.12); } to { transform: scale(1); } }
.hero__content { position: relative; max-width: 1200px; padding-top: 5rem; }
.hero h1 { color: var(--cream); margin-bottom: 1.8rem; }
.hero h1 em { color: var(--sand); }
.hero__lead { max-width: 520px; font-size: 1.1rem; color: rgba(246,242,236,.85); margin-bottom: 2.6rem; }
.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero__scroll { position: absolute; left: 50%; bottom: 2.5rem; width: 1px; height: 60px; background: rgba(210,199,180,.35); overflow: hidden; }
.hero__scroll span { position: absolute; top: -60px; left: 0; width: 1px; height: 60px; background: var(--sand); animation: scrollLine 2.2s infinite; }
@keyframes scrollLine { to { top: 60px; } }

/* ===== Estudio ===== */
.about__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6rem; align-items: center; }
.stats { display: flex; gap: 3rem; margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--sand); }
.stats strong { display: block; font-family: var(--font-serif); font-size: 2.6rem; font-weight: 500; color: var(--teal); line-height: 1; }
.stats span { font-size: .75rem; letter-spacing: .15em; text-transform: uppercase; color: var(--stone); }
.about__images { position: relative; padding-bottom: 4rem; }
.about__img { object-fit: cover; background: var(--sand); }
.about__img--main { width: 85%; aspect-ratio: 4/5; margin-left: auto; }
.about__img--small { position: absolute; left: 0; bottom: 0; width: 48%; aspect-ratio: 1; border: 10px solid var(--cream); }

/* ===== Servicios ===== */
.services { background: var(--white); }
.services__grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--sand); border-left: 1px solid var(--sand); }
.service {
  padding: 3rem 2.5rem; border-right: 1px solid var(--sand); border-bottom: 1px solid var(--sand);
  transition: background .4s var(--ease);
}
.service:hover { background: var(--cream); }
.service__num { display: block; font-family: var(--font-serif); font-size: 1rem; color: var(--taupe); margin-bottom: 1.5rem; }
.service p { color: var(--charcoal); font-size: .95rem; }

/* ===== IA ===== */
.ai { background: var(--teal); color: var(--sand); }
.ai h2 { color: var(--cream); }
.ai h2 em { color: var(--sand); }
.ai__grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 5rem; align-items: center; }
.steps { list-style: none; margin-top: 2.5rem; display: grid; gap: 1.2rem; }
.steps li { display: flex; align-items: center; gap: 1rem; color: var(--cream); }
.steps span {
  width: 36px; height: 36px; flex-shrink: 0; border: 1px solid var(--taupe); border-radius: 50%;
  display: grid; place-items: center; font-family: var(--font-serif); color: var(--sand);
}
.chat { background: var(--cream); color: var(--charcoal); box-shadow: 0 30px 60px rgba(0,0,0,.25); }
.chat__head { display: flex; align-items: center; gap: .9rem; padding: 1.1rem 1.4rem; background: var(--white); border-bottom: 1px solid var(--sand); }
.chat__head strong { display: block; font-weight: 500; color: var(--teal); font-size: .95rem; }
.chat__head small { color: var(--stone); font-size: .75rem; }
.chat__avatar { width: 40px; height: 40px; border-radius: 50%; background: var(--teal); color: var(--sand); display: grid; place-items: center; font-family: var(--font-serif); }
.chat__body { height: 320px; overflow-y: auto; padding: 1.4rem; display: flex; flex-direction: column; gap: .8rem; }
.msg { max-width: 85%; padding: .8rem 1.1rem; font-size: .9rem; line-height: 1.5; animation: msgIn .4s var(--ease); }
.msg--bot { background: var(--white); border: 1px solid var(--sand); align-self: flex-start; border-radius: 2px 14px 14px 14px; }
.msg--user { background: var(--teal); color: var(--cream); align-self: flex-end; border-radius: 14px 2px 14px 14px; }
.msg--typing { color: var(--stone); font-style: italic; }
@keyframes msgIn { from { opacity: 0; transform: translateY(8px); } }
.chat__options { display: flex; flex-wrap: wrap; gap: .5rem; padding: 1rem 1.4rem; border-top: 1px solid var(--sand); }
.chat__options .chip { border-color: var(--taupe); color: var(--taupe); }
.chat__options .chip:hover { background: var(--taupe); color: var(--white); }
.chat__options .chip:disabled { opacity: .4; pointer-events: none; }
.chat .ai__note { padding: 0 1.4rem 1rem; margin: 0; }
.chip {
  padding: .5rem 1rem; border: 1px solid rgba(210,199,180,.4); background: transparent; color: var(--sand);
  font-family: var(--font-sans); font-size: .8rem; cursor: pointer; border-radius: 99px; transition: .3s;
}
.chip:hover { border-color: var(--sand); }
.chip.is-active { background: var(--sand); color: var(--teal); border-color: var(--sand); }
.ai__note { margin-top: 1rem; font-size: .8rem; color: var(--stone); text-align: center; }

/* ===== Problema ===== */
.pains { list-style: none; margin-top: 2.5rem; padding-top: 2rem; border-top: 1px solid var(--sand); display: grid; gap: .9rem; }
.pains li { position: relative; padding-left: 1.8rem; }
.pains li::before { content: "—"; position: absolute; left: 0; color: var(--taupe); }
.section__head > p:not(.eyebrow) { color: var(--charcoal); }

/* ===== Calculadora ===== */
.calc__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6rem; align-items: center; }
.calc__box { background: var(--white); padding: 3rem; border: 1px solid var(--sand); display: grid; gap: 2rem; }
.calc__box label { display: grid; gap: .8rem; font-size: .8rem; letter-spacing: .1em; text-transform: uppercase; color: var(--charcoal); }
.calc__box output { font-family: var(--font-serif); font-size: 1.6rem; color: var(--teal); text-transform: none; letter-spacing: 0; }
.calc__box input[type="range"] { accent-color: var(--teal); width: 100%; }
.calc__result { text-align: center; padding: 2rem; background: var(--teal); color: var(--sand); }
.calc__result strong { display: block; font-family: var(--font-serif); font-size: 4rem; font-weight: 500; color: var(--cream); line-height: 1; }
.calc__result span { font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; }
.calc__note { font-size: .78rem; color: var(--stone); }

/* ===== Proceso ===== */
.process { background: var(--white); }
.process__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2.5rem; }
.step { border-top: 1px solid var(--taupe); padding-top: 2rem; }
.step__num { display: block; font-family: var(--font-serif); font-size: 3rem; color: var(--sand); line-height: 1; margin-bottom: 1rem; }
.step p { font-size: .95rem; }
.tools { margin-top: 5rem; text-align: center; }
.tools p { font-size: .75rem; letter-spacing: .2em; text-transform: uppercase; color: var(--stone); margin-bottom: 1.5rem; }
.tools ul { list-style: none; display: flex; flex-wrap: wrap; justify-content: center; gap: .8rem; }
.tools li { padding: .6rem 1.3rem; border: 1px solid var(--sand); font-size: .85rem; color: var(--charcoal); border-radius: 99px; }

/* ===== FAQ ===== */
.faq__inner { max-width: 820px; }
.faq details { border-bottom: 1px solid var(--sand); }
.faq summary {
  cursor: pointer; list-style: none; padding: 1.6rem 2.5rem 1.6rem 0; position: relative;
  font-family: var(--font-serif); font-size: 1.45rem; color: var(--teal);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 0; top: 50%; transform: translateY(-50%); font-size: 1.6rem; color: var(--taupe); transition: transform .3s; }
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq details p { padding-bottom: 1.6rem; max-width: 680px; }

/* ===== Contacto ===== */
.contact { background: var(--white); }
.contact__list a { border-bottom: 1px solid var(--sand); transition: border-color .3s, color .3s; }
.contact__list a:hover { color: var(--teal); border-color: var(--teal); }
.contact__grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 6rem; }
.contact__list { list-style: none; margin-top: 2.5rem; display: grid; gap: 1.2rem; }
.contact__list strong { display: block; font-size: .7rem; letter-spacing: .2em; text-transform: uppercase; color: var(--taupe); font-weight: 500; }
.form { display: grid; gap: 1.5rem; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.form label { display: grid; gap: .5rem; font-size: .75rem; letter-spacing: .15em; text-transform: uppercase; color: var(--stone); }
.form input, .form textarea, .form select {
  font: inherit; font-size: 1rem; letter-spacing: 0; text-transform: none; color: var(--charcoal);
  background: transparent; border: 0; border-bottom: 1px solid var(--stone); padding: .6rem 0; resize: vertical;
  transition: border-color .3s;
}
.form input:focus, .form textarea:focus, .form select:focus { outline: none; border-color: var(--teal); }
.form .is-invalid { border-color: #a4513f; }
.form .btn { justify-self: start; }
.form__status { font-size: .9rem; color: var(--teal); min-height: 1.5em; }
.form__status.is-error { color: #a4513f; }
.form__trap { display: none; }
.form .btn:disabled { opacity: .6; pointer-events: none; }

/* ===== Pie ===== */
.footer { background: var(--charcoal); color: var(--sand); padding: 4rem 0 2rem; }
.footer__inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 2rem; padding-bottom: 3rem; border-bottom: 1px solid rgba(210,199,180,.2); }
.footer__nav, .footer__social { display: flex; gap: 1.8rem; flex-wrap: wrap; font-size: .8rem; letter-spacing: .1em; text-transform: uppercase; }
.footer a:hover { color: var(--cream); }
.footer__copy { text-align: center; font-size: .8rem; color: var(--stone); margin-top: 2rem; }

/* ===== Animación al hacer scroll ===== */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .nav {
    position: fixed; inset: 0; background: var(--teal); flex-direction: column; justify-content: center;
    gap: 2rem; transform: translateX(100%); transition: transform .5s var(--ease);
  }
  .nav.is-open { transform: none; }
  .nav a, .header.is-scrolled .nav a:not(.btn) { color: var(--cream); font-size: 1rem; }
  .header.is-scrolled .nav .btn { border-color: var(--cream); color: var(--cream); }
  .nav-toggle { display: block; z-index: 60; }
  .nav-toggle.is-open span { background: var(--cream) !important; }
  .nav-toggle.is-open span:first-child { top: 9px; transform: rotate(45deg); }
  .nav-toggle.is-open span:last-child { bottom: 10px; transform: rotate(-45deg); }

  .about__grid, .ai__grid, .contact__grid, .calc__grid { grid-template-columns: 1fr; gap: 3.5rem; }
  .services__grid, .process__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .container { width: calc(100% - 2rem); }
  .services__grid, .process__grid, .form__row { grid-template-columns: 1fr; }
  .calc__box { padding: 1.8rem; }
  .hero h1 { font-size: 2.6rem; }
  .stats { gap: 1.5rem; }
  .stats strong { font-size: 2rem; }
  .footer__inner { flex-direction: column; align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}