/* =============================================================
   Alfa Omega Constructora — Design System
   ============================================================= */
:root {
  --bg:         #F7F4ED;
  --bg-2:       #EDE6D8;
  --paper:      #FFFFFF;
  --ink:        #1B1B18;
  --ink-soft:   #43413A;
  --ink-mute:   #78746A;

  --main:       #1B1B18;
  --main-2:     #000000;
  --main-tint:  #EDE6D8;

  --accent:     #B5592E;
  --accent-soft:#F0DCCB;
  --accent-deep:#8B4322;

  --line:       rgba(27, 27, 24, 0.14);
  --line-soft:  rgba(27, 27, 24, 0.07);

  --serif: "Swiss721 BT", "Swiss 721 BT", "SwissBT", "Inter", -apple-system, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --sans:  "Swiss721 BT", "Swiss 721 BT", "SwissBT", "Inter", -apple-system, "Helvetica Neue", Helvetica, Arial, sans-serif;

  --ease-out:  cubic-bezier(0.16, 1, 0.3, 1);

  --radius: 18px;
  --radius-sm: 10px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
p { text-align: justify; text-justify: inter-word; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; }
h1, h2, h3 { font-family: var(--serif); line-height: 1.12; font-weight: 600; text-transform: uppercase; letter-spacing: .01em; }
::selection { background: var(--accent-soft); color: var(--accent-deep); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.container { max-width: 1180px; margin: 0 auto; padding-inline: 1.5rem; }

.skip-link {
  position: absolute; top: -100px; left: 1rem; z-index: 999;
  padding: .7rem 1.1rem; background: var(--ink); color: #fff;
  border-radius: 8px; transition: top .3s var(--ease-out);
}
.skip-link:focus { top: 1rem; }

.kicker {
  font-family: var(--sans); font-size: .76rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent-deep); margin-bottom: 1.1rem; font-weight: 700;
}
.kicker-light { color: var(--accent-soft); }
.section-title { font-size: clamp(1.8rem, 3.6vw, 2.7rem); color: var(--ink); max-width: 720px; }
.section-sub { color: var(--ink-mute); margin-top: 1rem; font-size: 1.02rem; max-width: 620px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .85rem 1.7rem; border-radius: 999px; font-weight: 600; font-size: .92rem;
  transition: transform .2s var(--ease-out), background-color .2s var(--ease-out), box-shadow .2s var(--ease-out);
  border: none; text-transform: uppercase; letter-spacing: .03em;
}
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--main-2); transform: translateY(-2px); box-shadow: 0 12px 30px rgba(27,27,24,0.25); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-deep); transform: translateY(-2px); box-shadow: 0 12px 30px rgba(181,89,46,0.35); }
.btn-ghost { background: var(--paper); color: var(--ink); border: 1px solid var(--line); }
.btn-ghost:hover { background: var(--main-tint); }
.btn-ghost-light { background: rgba(255,255,255,0.14); color: #fff; border: 1px solid rgba(255,255,255,0.45); backdrop-filter: blur(4px); }
.btn-ghost-light:hover { background: rgba(255,255,255,0.24); }
.btn-sm { padding: .6rem 1.2rem; font-size: .85rem; }
.btn-block { width: 100%; }

/* =============================================================
   Nav
   ============================================================= */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 1.2rem 0; transition: background-color .3s var(--ease-out), box-shadow .3s var(--ease-out), padding .3s var(--ease-out);
}
.nav.is-scrolled { background: rgba(247,244,237,0.94); backdrop-filter: blur(10px); box-shadow: 0 1px 0 var(--line); padding: .75rem 0; }
.nav-inner { max-width: 1180px; margin: 0 auto; padding-inline: 1.5rem; display: flex; align-items: flex-start; justify-content: space-between; gap: 1.5rem; }
.nav-links, .nav-cta, .nav-toggle { margin-top: 2px; }
.brand { display: flex; align-items: center; position: relative; height: 80px; min-width: 230px; }
.brand-logo { height: 80px; width: auto; max-width: none; position: absolute; left: 0; top: 0; transition: opacity .25s var(--ease-out); }
.brand-logo-dark { opacity: 0; }
.brand-logo-light { opacity: 1; }
.nav.is-scrolled .brand-logo-dark { opacity: 1; }
.nav.is-scrolled .brand-logo-light { opacity: 0; }
.nav-links { display: none; align-items: center; gap: 1.8rem; }
.nav-link { font-size: .82rem; font-weight: 600; color: #fff; transition: color .2s; text-transform: uppercase; letter-spacing: .04em; }
.nav.is-scrolled .nav-link { color: var(--ink-soft); }
.nav-link:hover { color: var(--accent); }
.nav-cta { display: none; }
.nav-toggle { display: flex; flex-direction: column; gap: 5px; background: none; border: none; padding: .5rem; }
.nav-toggle span { width: 22px; height: 2px; background: #fff; border-radius: 2px; transition: background-color .2s; }
.nav.is-scrolled .nav-toggle span { background: var(--ink); }

@media (min-width: 900px) {
  .nav-links { display: flex; }
  .nav-cta { display: inline-flex; }
}

.nav-mobile {
  position: fixed; inset: 0; z-index: 99; background: var(--paper); padding: 6rem 1.5rem 2rem;
  display: flex; flex-direction: column; gap: 1.5rem;
  transform: translateX(100%); transition: transform .35s var(--ease-out);
}
html.nav-open .nav-mobile { transform: translateX(0); }
.nav-mobile-links { display: flex; flex-direction: column; gap: 1.25rem; }
.nav-mobile-link { font-size: 1.1rem; font-weight: 600; color: var(--ink); font-family: var(--serif); text-transform: uppercase; letter-spacing: .02em; }

@media (min-width: 900px) { .nav-mobile, .nav-toggle { display: none; } }

/* =============================================================
   Hero
   ============================================================= */
.hero { position: relative; min-height: 94vh; display: flex; flex-direction: column; align-items: stretch; justify-content: center; overflow: hidden; padding-top: 7.5rem; }
.hero-bg { position: absolute; inset: 0; z-index: -1; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; }
.hero-scrim { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(0,0,0,0.45) 0%, rgba(0,0,0,0.62) 70%, rgba(0,0,0,0.72) 100%); }
.hero-inner { position: relative; width: 100%; max-width: 1180px; margin: 0 auto; padding: 4rem 1.5rem 5rem; box-sizing: border-box; }
.hero-title { font-family: var(--serif); font-weight: 500; font-size: clamp(2.3rem, 5.6vw, 3.9rem); color: #fff; max-width: 780px; }
.hero-line { display: block; }
.hero-sub { color: rgba(255,255,255,0.88); max-width: 560px; margin-top: 1.5rem; font-size: 1.08rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.25rem; }

.hero-badge-strip {
  display: grid; grid-template-columns: repeat(2, minmax(130px, 155px)); justify-content: start; gap: .9rem;
  margin: 3rem auto 0; max-width: 1180px; width: 100%; box-sizing: border-box; padding-inline: 1.5rem;
}
@media (min-width: 700px) { .hero-badge-strip { grid-template-columns: repeat(4,1fr); } }
.hero-badge {
  font-size: .74rem; font-weight: 600; color: #fff; text-align: center;
  padding: .8rem .6rem; border-radius: var(--radius-sm); background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.22);
  backdrop-filter: blur(4px); text-transform: uppercase; letter-spacing: .03em;
}

/* =============================================================
   Marquee
   ============================================================= */
.sectors { background: var(--ink); padding-block: 1.1rem; overflow: hidden; }
.marquee { overflow: hidden; }
.marquee-track {
  display: flex; gap: .75rem; white-space: nowrap; width: max-content;
  animation: marqueeScroll 32s linear infinite;
  font-family: var(--serif); font-size: 1.05rem; color: rgba(255,255,255,0.9);
}
.marquee-track .dot { color: var(--accent); }
@keyframes marqueeScroll { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* =============================================================
   Servicios
   ============================================================= */
.services { padding-block: clamp(4.5rem, 9vw, 7rem); }
.services-grid { display: grid; gap: 1.5rem; grid-template-columns: 1fr; margin-top: 3rem; }
@media (min-width: 780px) { .services-grid { grid-template-columns: repeat(3, 1fr); } }
.service-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 2.25rem 1.75rem; transition: transform .25s var(--ease-out), box-shadow .25s var(--ease-out);
}
.service-card:hover { transform: translateY(-4px); box-shadow: 0 20px 45px rgba(27,27,24,0.08); }
.service-num { font-family: var(--serif); font-size: 1.05rem; color: var(--accent); font-weight: 600; }
.service-card h3 { font-size: 1.3rem; margin: .75rem 0 .6rem; color: var(--ink); }
.service-card p { color: var(--ink-mute); font-size: .95rem; }

/* =============================================================
   Nosotros
   ============================================================= */
.about { padding-block: clamp(4.5rem, 9vw, 7rem); background: var(--bg-2); }
.about-grid { display: grid; gap: 3rem; grid-template-columns: 1fr; align-items: center; }
@media (min-width: 900px) { .about-grid { grid-template-columns: 0.9fr 1.1fr; } }
.about-media img { border-radius: var(--radius); width: 100%; aspect-ratio: 4/5; object-fit: cover; box-shadow: 0 30px 60px rgba(27,27,24,0.16); }
.about-body p { color: var(--ink-soft); margin-bottom: 1rem; font-size: 1rem; }
.about-body h2 { margin-bottom: 1.25rem; }
.about-stats { display: flex; gap: 2.25rem; margin-top: 2rem; flex-wrap: wrap; }
.about-stat-num { font-family: var(--serif); font-size: 2.1rem; color: var(--accent-deep); display: block; }
.about-stat-label { font-size: .8rem; color: var(--ink-mute); margin-top: .2rem; }
.about-brands { margin-top: 2rem; font-size: .88rem; color: var(--ink-mute); padding-top: 1.5rem; border-top: 1px solid var(--line); }
.about-brands strong { color: var(--accent-deep); }
.about-brands-links { display: flex; flex-wrap: wrap; gap: 1.25rem; margin-top: .75rem; }
.about-brands-links a { font-weight: 600; color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.about-brands-links a:hover { color: var(--accent-deep); }

/* =============================================================
   Proyectos / Portfolio + Lightbox
   ============================================================= */
.portfolio { padding-block: clamp(4.5rem, 9vw, 7rem); }
.portfolio-filters { display: flex; gap: .6rem; margin-top: 2rem; flex-wrap: wrap; }
.cat-filter {
  padding: .55rem 1.3rem; border-radius: 999px; border: 1px solid var(--line);
  background: var(--paper); color: var(--ink-soft); font-size: .8rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: .03em;
  transition: background-color .2s var(--ease-out), color .2s var(--ease-out);
}
.cat-filter.is-active { background: var(--ink); color: #fff; border-color: var(--ink); }
.portfolio-item.is-hidden { display: none; }
.portfolio-empty { color: var(--ink-mute); margin-top: 2rem; }
.portfolio-grid {
  display: grid; gap: 1rem; margin-top: 3rem; grid-auto-flow: dense;
  grid-template-columns: 1fr; grid-auto-rows: 260px;
}
@media (min-width: 640px) { .portfolio-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 980px) { .portfolio-grid { grid-template-columns: repeat(4, 1fr); grid-auto-rows: 240px; } }
.portfolio-item {
  position: relative; border-radius: var(--radius-sm); overflow: hidden; display: block;
  grid-column: span 1; grid-row: span 1;
}
.portfolio-item-lg { grid-column: span 1; grid-row: span 1; }
@media (min-width: 640px) { .portfolio-item-lg { grid-column: span 2; grid-row: span 2; } }
.portfolio-item-tall { grid-row: span 2; }
.portfolio-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease-out); }
.portfolio-item:hover img { transform: scale(1.06); }
.portfolio-caption {
  position: absolute; inset: auto 0 0 0; padding: 1.5rem 1.1rem 1rem;
  background: linear-gradient(180deg, rgba(0,0,0,0) 0%, rgba(0,0,0,0.78) 100%);
  color: #fff; font-weight: 600; font-size: .92rem;
  display: flex; flex-direction: column; gap: .15rem;
}
.portfolio-caption small { font-weight: 400; opacity: .8; font-size: .76rem; }

.lightbox {
  position: fixed; inset: 0; z-index: 300; background: rgba(10,10,8,0.92);
  display: flex; align-items: center; justify-content: center; padding: 2rem;
  opacity: 0; pointer-events: none; transition: opacity .25s var(--ease-out);
}
.lightbox.is-open { opacity: 1; pointer-events: auto; }
.lightbox img { max-width: 100%; max-height: 88vh; border-radius: 8px; object-fit: contain; }
.lightbox-close {
  position: absolute; top: 1.25rem; right: 1.5rem; background: rgba(255,255,255,0.12); color: #fff;
  border: none; width: 42px; height: 42px; border-radius: 50%; font-size: 1.4rem; line-height: 1; cursor: pointer;
}
.lightbox-close:hover { background: rgba(255,255,255,0.22); }

/* =============================================================
   Cómo trabajamos / Proceso
   ============================================================= */
.process { padding-block: clamp(4.5rem, 9vw, 7rem); background: var(--ink); color: #fff; }
.process .kicker { color: var(--accent-soft); }
.process .section-title { color: #fff; }
.process-grid { display: grid; gap: 2rem; grid-template-columns: 1fr; margin-top: 3rem; }
@media (min-width: 780px) { .process-grid { grid-template-columns: repeat(4, 1fr); } }
.process-step-num {
  display: inline-flex; align-items: center; justify-content: center; width: 42px; height: 42px;
  border-radius: 50%; border: 1px solid rgba(255,255,255,0.3); font-family: var(--serif); font-size: 1.15rem;
  color: var(--accent-soft); margin-bottom: 1rem;
}
.process-step h3 { font-size: 1.1rem; color: #fff; margin-bottom: .5rem; }
.process-step p { color: rgba(255,255,255,0.68); font-size: .9rem; }

/* =============================================================
   Testimonios
   ============================================================= */
.testimonials { padding-block: clamp(4.5rem, 9vw, 7rem); }
.testimonial-slider { max-width: 760px; margin: 3rem auto 0; }
.testimonial-track { display: flex; overflow: hidden; }
.testimonial-track { transition: transform .4s var(--ease-out); }
.testimonial-card {
  min-width: 100%; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 2.5rem; text-align: center;
}
.testimonial-card p { font-family: var(--serif); font-size: 1.25rem; color: var(--ink); line-height: 1.5; text-align: center; }
.testimonial-card footer { margin-top: 1.25rem; color: var(--ink-mute); font-size: .8rem; font-weight: 600; text-transform: uppercase; letter-spacing: .03em; }
.testimonial-controls { display: flex; align-items: center; justify-content: center; gap: 1.25rem; margin-top: 1.75rem; }
.testimonial-arrow {
  width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--line); background: var(--paper);
  display: flex; align-items: center; justify-content: center; font-size: 1.1rem; color: var(--ink);
}
.testimonial-arrow:hover { background: var(--main-tint); }
.testimonial-dots { display: flex; gap: .5rem; }
.testimonial-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--line); border: none; }
.testimonial-dot.is-active { background: var(--accent); }

/* =============================================================
   Cross-promo O'Brien
   ============================================================= */
.cross-promo { padding-block: 2.5rem; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.cross-promo-inner {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 1.25rem 2rem; text-align: center;
}
.cross-promo-text { font-family: var(--serif); font-size: 1.05rem; color: var(--ink); text-transform: uppercase; letter-spacing: .02em; text-align: center; }
.cross-promo-link {
  display: inline-flex; align-items: center; gap: .9rem; padding: .6rem 1.1rem; border-radius: 999px;
  border: 1px solid var(--line); background: var(--paper); transition: background-color .2s var(--ease-out), transform .2s var(--ease-out);
}
.cross-promo-link:hover { background: var(--main-tint); transform: translateY(-2px); }
.cross-promo-link img { height: 30px; width: auto; }
.cross-promo-link span { font-size: .82rem; font-weight: 600; color: var(--accent-deep); text-transform: uppercase; letter-spacing: .03em; }

/* =============================================================
   Contacto / CTA
   ============================================================= */
.cta-section { padding-block: clamp(4.5rem, 9vw, 7rem); background: var(--bg-2); }
.cta-grid { display: grid; gap: 3rem; grid-template-columns: 1fr; }
@media (min-width: 940px) { .cta-grid { grid-template-columns: 0.9fr 1.1fr; } }
.cta-info-list { margin-top: 2rem; display: flex; flex-direction: column; gap: .9rem; }
.cta-info-list li { font-size: .95rem; color: var(--ink-soft); }
.cta-info-list strong { display: block; font-size: .74rem; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-mute); margin-bottom: .15rem; }
.cta-info-list a:hover { color: var(--accent-deep); }

.cta-form-wrap { position: relative; }
.cta-form {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 2rem; display: flex; flex-direction: column; gap: 1.1rem;
}
.form-row { display: flex; flex-direction: column; gap: .4rem; }
.form-row-2 { display: grid; grid-template-columns: 1fr; gap: 1.1rem; }
@media (min-width: 520px) { .form-row-2 { grid-template-columns: 1fr 1fr; } }
.form-row label { font-size: .78rem; font-weight: 600; color: var(--ink-mute); }
.form-row input, .form-row select, .form-row textarea {
  border: 1px solid var(--line); border-radius: var(--radius-sm); padding: .75rem .9rem;
  font: inherit; color: var(--ink); background: var(--bg);
}
.form-row textarea { resize: vertical; }
.form-row input:focus, .form-row select:focus, .form-row textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.cta-form.is-sending { opacity: .7; pointer-events: none; }

.cta-success {
  position: absolute; inset: 0; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 2rem;
  opacity: 0; pointer-events: none; transition: opacity .3s var(--ease-out);
}
.cta-success.is-visible { opacity: 1; pointer-events: auto; }
.cta-success h3 { font-size: 1.4rem; color: var(--accent-deep); margin-bottom: .6rem; }
.cta-success p { color: var(--ink-soft); text-align: center; }

/* =============================================================
   Footer
   ============================================================= */
.footer { background: var(--ink); color: rgba(255,255,255,0.75); padding-block: 3.5rem 1.75rem; }
.footer-inner { display: grid; gap: 2.5rem; grid-template-columns: 1fr; }
@media (min-width: 780px) { .footer-inner { grid-template-columns: 1.3fr 1fr 1fr; } }
.footer-brand .brand-logo { height: 42px; margin-bottom: 1rem; position: static; opacity: 1; }
.footer-tagline { font-size: .88rem; line-height: 1.6; }
.footer-links { display: flex; flex-direction: column; gap: .7rem; }
.footer-links a { font-size: .84rem; text-transform: uppercase; letter-spacing: .03em; }
.footer-links a:hover { color: #fff; }
.footer-social { display: flex; gap: .7rem; margin-top: .5rem; }
.footer-social-link { width: 36px; height: 36px; border-radius: 999px; border: 1px solid rgba(255,255,255,0.3); display: flex; align-items: center; justify-content: center; }
.footer-social-link:hover { background: rgba(255,255,255,0.12); }
.footer-copy { margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,0.15); font-size: .78rem; text-align: center; }

/* =============================================================
   WhatsApp flotante
   ============================================================= */
.whatsapp-fab {
  position: fixed; right: calc(clamp(1rem, 3vw, 1.75rem) + 58px + 14px); bottom: clamp(1rem, 3vw, 1.75rem);
  width: 58px; height: 58px; border-radius: 50%;
  background: #25D366; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 10px 30px rgba(37, 211, 102, 0.4); z-index: 200;
  transition: transform .25s var(--ease-out);
}
.whatsapp-fab:hover { transform: translateY(-2px); }
@media (max-width: 420px) {
  .whatsapp-fab { right: clamp(1rem, 3vw, 1.75rem); bottom: calc(clamp(1rem, 3vw, 1.75rem) + 58px + 12px); width: 52px; height: 52px; }
  .whatsapp-fab svg { width: 26px; height: 26px; }
}

/* =============================================================
   Chat de soporte (IA)
   ============================================================= */
.chat-widget { position: fixed; right: clamp(1rem, 3vw, 1.75rem); bottom: clamp(1rem, 3vw, 1.75rem); z-index: 200; }
.chat-toggle {
  width: 58px; height: 58px; border-radius: 50%; border: none;
  background: var(--ink); color: #fff;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 10px 30px rgba(27,27,24,0.35);
  cursor: pointer;
  transition: background-color .25s var(--ease-out), transform .25s var(--ease-out);
}
.chat-toggle:hover { background: var(--accent-deep); transform: translateY(-2px); }
.chat-toggle-icon-close { display: none; }
.chat-widget.is-open .chat-toggle-icon-open { display: none; }
.chat-widget.is-open .chat-toggle-icon-close { display: block; }

.chat-panel {
  position: absolute; right: 0; bottom: calc(100% + .85rem);
  width: min(360px, calc(100vw - 2rem));
  height: min(480px, 70vh);
  background: var(--paper);
  border-radius: 18px;
  box-shadow: 0 24px 60px rgba(27,27,24,0.28);
  border: 1px solid var(--line-soft);
  display: flex; flex-direction: column;
  overflow: hidden;
  opacity: 0; transform: translateY(12px) scale(.98);
  pointer-events: none;
  transition: opacity .25s var(--ease-out), transform .25s var(--ease-out);
}
.chat-widget.is-open .chat-panel { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }

.chat-panel-head {
  background: var(--ink); color: #fff;
  padding: 1rem 1.1rem;
  display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem;
  flex-shrink: 0;
}
.chat-panel-title { font-size: .88rem; font-weight: 600; text-transform: uppercase; letter-spacing: .03em; }
.chat-panel-sub { font-size: .74rem; color: rgba(255,255,255,0.7); margin-top: .2rem; }
.chat-close { background: none; border: none; color: #fff; font-size: 1.3rem; line-height: 1; cursor: pointer; padding: 0 .1rem; }

.chat-messages {
  flex: 1; overflow-y: auto;
  padding: 1rem;
  display: flex; flex-direction: column; gap: .6rem;
  background: var(--bg);
}
.chat-msg {
  max-width: 84%;
  padding: .6rem .8rem;
  border-radius: 14px;
  font-size: .84rem; line-height: 1.45;
  white-space: pre-wrap;
}
.chat-msg-model { align-self: flex-start; background: var(--paper); border: 1px solid var(--line-soft); color: var(--ink-soft); border-bottom-left-radius: 4px; }
.chat-msg-user { align-self: flex-end; background: var(--ink); color: #fff; border-bottom-right-radius: 4px; }
.chat-msg-typing { display: flex; gap: .3rem; align-items: center; padding-block: .8rem; }
.chat-msg-typing span {
  width: 6px; height: 6px; border-radius: 50%; background: var(--ink-mute);
  opacity: .5; animation: chatTyping 1s ease-in-out infinite;
}
.chat-msg-typing span:nth-child(2) { animation-delay: .15s; }
.chat-msg-typing span:nth-child(3) { animation-delay: .3s; }
@keyframes chatTyping { 0%, 60%, 100% { opacity: .35; transform: translateY(0); } 30% { opacity: 1; transform: translateY(-2px); } }

.chat-form {
  flex-shrink: 0;
  display: flex; gap: .5rem;
  padding: .75rem;
  border-top: 1px solid var(--line-soft);
  background: var(--paper);
}
.chat-input {
  flex: 1; border: 1px solid var(--line); border-radius: 999px;
  padding: .55rem 1rem; font-size: .84rem; color: var(--ink);
  background: var(--bg);
}
.chat-input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.chat-send {
  width: 38px; height: 38px; border-radius: 50%; border: none; flex-shrink: 0;
  background: var(--ink); color: #fff;
  display: flex; align-items: center; justify-content: center; cursor: pointer;
  transition: background-color .2s var(--ease-out);
}
.chat-send:hover { background: var(--accent-deep); }

@media (max-width: 420px) {
  .chat-panel { width: calc(100vw - 1.5rem); right: -.25rem; }
}

/* =============================================================
   Reveal animation
   ============================================================= */
[data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease-out), transform .7s var(--ease-out); }
[data-reveal].is-revealed { opacity: 1; transform: translateY(0); }

/* =============================================================
   Reduced motion
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-reveal] { transition: none; opacity: 1; transform: none; }
  .marquee-track { animation: none; }
}