/* ============================================================
   Alpha Ingeniería Ambiental — sistema de diseño
   Paleta: grafito, pino mineral, pizarra técnica, papel cálido
   ============================================================ */

:root {
  --ink:        #151b1d;
  --ink-soft:   #4c5559;
  --paper:      #f5f3ee;
  --paper-dim:  #ece9e1;
  --pine:       #33554a;
  --pine-dark:  #203e35;
  --slate:      #2e4a5c;
  --clay:       #9c7a56;
  --line:       #d9d3c5;
  --line-dark:  rgba(21, 27, 29, 0.16);
  --white:      #fffdf9;

  --font-display: 'Source Serif 4', Georgia, serif;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --container: 1180px;
  --gutter: clamp(1.5rem, 5vw, 4rem);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.15;
  margin: 0;
  color: var(--ink);
  letter-spacing: -0.01em;
}

p { margin: 0; }

a { color: inherit; text-decoration: none; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

section { position: relative; }

.section-pad { padding: clamp(4.5rem, 9vw, 8rem) 0; }

.rule {
  border: none;
  border-top: 1px solid var(--line);
  margin: 0;
}

.label {
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  font-weight: 500;
}

.kicker {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
.kicker::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--pine);
  display: inline-block;
}
.kicker span { font-size: 0.875rem; color: var(--pine); font-weight: 500; }

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 2rem 4rem;
  align-items: end;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}
.section-head h2 {
  font-size: clamp(1.75rem, 3.2vw, 2.5rem);
}
.section-head p {
  color: var(--ink-soft);
  max-width: 46ch;
  font-size: 1.0625rem;
}

@media (max-width: 760px) {
  .section-head { grid-template-columns: 1fr; }
}

/* ---------------- Buttons ---------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.9rem 1.7rem;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
  font-family: var(--font-body);
}

.btn-primary {
  background: var(--ink);
  color: var(--white);
}
.btn-primary:hover { background: var(--pine-dark); }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-dark);
}
.btn-ghost:hover { border-color: var(--ink); }

.btn-on-dark {
  background: var(--white);
  color: var(--ink);
}
.btn-on-dark:hover { background: var(--paper-dim); }

.btn-ghost-on-dark {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.35);
}
.btn-ghost-on-dark:hover { border-color: var(--white); }

/* ---------------- Header / Nav ---------------- */

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(245, 243, 238, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.site-header.is-scrolled { border-bottom-color: var(--line); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
}

.brand {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}
.brand small {
  font-family: var(--font-body);
  font-size: 0.7rem;
  color: var(--pine);
  font-weight: 500;
}

.nav-links {
  display: flex;
  gap: 2.1rem;
  list-style: none;
  margin: 0; padding: 0;
}
.nav-links a {
  font-size: 0.9375rem;
  color: var(--ink-soft);
  position: relative;
  padding: 0.3rem 0;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  height: 1px; width: 0;
  background: var(--pine);
  transition: width 0.25s var(--ease);
}
.nav-links a:hover::after { width: 100%; }

.nav-cta { display: flex; align-items: center; gap: 1.5rem; }
.nav-cta .btn { padding: 0.65rem 1.3rem; font-size: 0.875rem; }

.nav-toggle {
  display: none;
  background: none; border: none; cursor: pointer;
  width: 32px; height: 22px; position: relative;
}
.nav-toggle span {
  position: absolute; left: 0; right: 0; height: 1.5px; background: var(--ink);
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease), top 0.25s var(--ease);
}
.nav-toggle span:nth-child(1) { top: 0; }
.nav-toggle span:nth-child(2) { top: 10px; }
.nav-toggle span:nth-child(3) { top: 20px; }
.nav-open .nav-toggle span:nth-child(1) { top: 10px; transform: rotate(45deg); }
.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav-open .nav-toggle span:nth-child(3) { top: 10px; transform: rotate(-45deg); }

@media (max-width: 920px) {
  .nav-links { display: none; }
  .nav-cta .btn-ghost { display: none; }
  .nav-toggle { display: block; }

  .nav-open .nav-links {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 78px; left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 1.5rem var(--gutter) 2rem;
    gap: 1.25rem;
  }
  .nav-open .nav-links a { font-size: 1.05rem; }
}

/* ---------------- Hero ---------------- */

.hero {
  padding: calc(78px + 4.5rem) 0 5rem;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: center;
}

.hero-eyebrow {
  font-size: 0.9375rem;
  color: var(--pine);
  font-weight: 500;
  margin-bottom: 1.25rem;
  display: block;
}

.hero h1 {
  font-size: clamp(2.4rem, 4.6vw, 3.9rem);
  letter-spacing: -0.015em;
}

.hero-sub {
  margin-top: 1.75rem;
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 46ch;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}

.hero-meta {
  display: flex;
  gap: 2.5rem;
  margin-top: 3.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
}
.hero-meta div span { display: block; }
.hero-meta .n { font-family: var(--font-display); font-size: 1.05rem; color: var(--ink); }
.hero-meta .l { font-size: 0.8125rem; color: var(--ink-soft); margin-top: 0.2rem; }

.hero-art {
  position: relative;
  aspect-ratio: 1 / 1.05;
}
.hero-art svg { width: 100%; height: 100%; }
.hero-art .contour {
  fill: none;
  stroke: var(--pine);
  stroke-width: 0.6;
  opacity: 0.55;
}
.hero-art .contour.alt { stroke: var(--slate); opacity: 0.4; }
.hero-art .node { fill: var(--pine); }
.hero-art .dim-line { stroke: var(--ink-soft); stroke-width: 0.4; opacity: 0.45; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-art { max-width: 340px; margin: 0 auto; order: -1; }
}

/* ---------------- Nosotros ---------------- */

.about-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 3.5rem;
  align-items: start;
}
.about-grid h2 { font-size: clamp(1.75rem, 3vw, 2.4rem); }
.about-text p { font-size: 1.0625rem; color: var(--ink-soft); }
.about-text p + p { margin-top: 1.1rem; }

.value-list {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem 2rem;
}
.value-list .v-label { font-size: 0.95rem; font-weight: 500; }
.value-list .v-text { font-size: 0.875rem; color: var(--ink-soft); margin-top: 0.35rem; }

@media (max-width: 760px) {
  .about-grid { grid-template-columns: 1fr; }
  .value-list { grid-template-columns: 1fr 1fr; }
}

/* ---------------- Servicios ---------------- */

.services-list { border-top: 1px solid var(--line); }

.service-row {
  display: grid;
  grid-template-columns: 44px 1.1fr 1.6fr;
  gap: 2rem;
  align-items: center;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
  transition: background 0.25s var(--ease);
}
.service-row:hover { background: rgba(51, 85, 74, 0.045); }

.service-icon { width: 30px; height: 30px; color: var(--pine); flex-shrink: 0; }
.service-row h3 {
  font-size: 1.0625rem;
  font-weight: 500;
  font-family: var(--font-body);
}
.service-row p { color: var(--ink-soft); font-size: 0.9375rem; max-width: 52ch; }

@media (max-width: 760px) {
  .service-row { grid-template-columns: 32px 1fr; }
  .service-row p { grid-column: 2; }
}

/* ---------------- Sectores / soluciones ---------------- */

.sectores-wrap { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 3rem; }
.sector-list { display: flex; flex-direction: column; }
.sector-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}
.sector-item:first-child { border-top: 1px solid var(--line); }
.sector-item h3 { font-size: 1.05rem; font-weight: 500; font-family: var(--font-body); margin-bottom: 0.4rem; }
.sector-item p { color: var(--ink-soft); font-size: 0.9375rem; }

.sectores-note {
  background: var(--paper-dim);
  padding: 2.25rem;
  align-self: start;
  border-left: 2px solid var(--pine);
}
.sectores-note p { color: var(--ink-soft); font-size: 1rem; }
.sectores-note p + p { margin-top: 1rem; }

@media (max-width: 820px) {
  .sectores-wrap { grid-template-columns: 1fr; }
}

/* ---------------- Capacidades ---------------- */

.capacidades {
  background: var(--ink);
  color: var(--white);
}
.capacidades .section-head p { color: rgba(255,255,255,0.62); }
.capacidades .section-head h2 { color: var(--white); }
.capacidades .kicker span { color: #8fb3a5; }
.capacidades .kicker::before { background: #8fb3a5; }

.cap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid rgba(255,255,255,0.14);
  border-left: 1px solid rgba(255,255,255,0.14);
}
.cap-cell {
  padding: 2.4rem 2rem;
  border-right: 1px solid rgba(255,255,255,0.14);
  border-bottom: 1px solid rgba(255,255,255,0.14);
}
.cap-cell h3 {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--white);
}
.cap-cell p {
  margin-top: 0.6rem;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
}

@media (max-width: 760px) {
  .cap-grid { grid-template-columns: 1fr; }
}

/* ---------------- Por qué Alpha ---------------- */

.why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem 3rem;
}
.why-item { padding-top: 1.5rem; border-top: 1px solid var(--line); }
.why-item h3 { font-size: 1.15rem; margin-bottom: 0.65rem; }
.why-item p { color: var(--ink-soft); font-size: 0.9625rem; }

@media (max-width: 700px) {
  .why-grid { grid-template-columns: 1fr; }
}

/* ---------------- CTA corporativo ---------------- */

.cta-band {
  background: var(--pine-dark);
  color: var(--white);
}
.cta-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
  padding: clamp(3rem, 6vw, 5rem) var(--gutter);
}
.cta-inner h2 {
  color: var(--white);
  font-size: clamp(1.6rem, 2.8vw, 2.15rem);
  max-width: 22ch;
}
.cta-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ---------------- Contacto ---------------- */

.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 3.5rem;
}

.contact-info dl {
  margin: 2rem 0 0;
}
.contact-info .info-row {
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}
.contact-info .info-row:first-of-type { border-top: 1px solid var(--line); }
.contact-info dt { font-size: 0.8125rem; color: var(--ink-soft); margin-bottom: 0.3rem; }
.contact-info dd { margin: 0; font-size: 1.0625rem; }
.contact-info a:hover { color: var(--pine); }

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem 1.25rem;
}
.form-grid .full { grid-column: 1 / -1; }

.field label {
  display: block;
  font-size: 0.8125rem;
  color: var(--ink-soft);
  margin-bottom: 0.45rem;
}
.field input,
.field select,
.field textarea {
  width: 100%;
  border: 1px solid var(--line-dark);
  background: var(--white);
  padding: 0.8rem 0.9rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--ink);
  border-radius: 2px;
  transition: border-color 0.2s;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--pine);
}
.field textarea { resize: vertical; min-height: 110px; }

.form-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}
.form-note { font-size: 0.8125rem; color: var(--ink-soft); }

.form-status {
  font-size: 0.9rem;
  padding: 0.85rem 1rem;
  border-left: 2px solid var(--pine);
  background: var(--paper-dim);
  display: none;
}
.form-status.show { display: block; }
.form-status.error { border-color: #a33b2f; }

@media (max-width: 820px) {
  .contact-grid { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
}

/* ---------------- Footer ---------------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.5rem 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a:hover { color: var(--pine); }

@media (max-width: 600px) {
  .footer-inner { align-items: flex-start; }
  .footer-links {
    flex: 1 1 100%;
    max-width: 100%;
    flex-wrap: wrap;
    gap: 0.75rem 1rem;
  }
}

/* ---------------- WhatsApp flotante ---------------- */

.wa-float {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 90;
  width: 52px; height: 52px;
  border-radius: 50%;
  background: var(--pine-dark);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 18px rgba(21,27,29,0.22);
  transition: transform 0.25s var(--ease);
}
.wa-float:hover { transform: translateY(-3px); }
.wa-float svg { width: 24px; height: 24px; }

/* ---------------- Reveal on scroll ---------------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Editorial image treatment and project catalogue */
.brand { gap: 0.7rem; }
.brand img { width: 42px; height: 42px; object-fit: contain; }
.hero { background: #e9e7df; }
.hero-art { overflow: hidden; background: var(--pine-dark); min-height: 390px; }
.hero-art img { width: 100%; height: 100%; min-height: 390px; object-fit: cover; filter: saturate(.78); }
.hero-art::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(21,27,29,.62), transparent 44%); pointer-events: none; }
.hero-art span { position: absolute; z-index: 1; bottom: 1.25rem; left: 1.5rem; color: #fff; font-size: .75rem; letter-spacing: .12em; text-transform: uppercase; }
.catalog-content { padding-top: 9rem; padding-bottom: 7rem; }
.catalog-content > h1 { max-width: 800px; font-size: 3rem; }
.catalog-lead { max-width: 560px; color: var(--ink-soft); margin: 1rem 0 3rem; }
.catalog-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.catalog-card { display: block; padding: 0 0 1.5rem; border-top: 1px solid var(--line); }
.catalog-card img { display: block; width: 100%; aspect-ratio: 1.45; object-fit: cover; margin: .8rem 0 1rem; }
.catalog-card > span { color: var(--pine); font-size: .7rem; font-weight: 600; letter-spacing: .1em; }
.catalog-card h2 { font-size: 1.35rem; margin: .45rem 0; }
.catalog-card p { color: var(--ink-soft); font-size: .9rem; }
.catalog-card b { font-size: .8rem; }
.catalog-empty { margin-top: 2rem; padding: 2rem 0; border-top: 1px solid var(--line); }
.catalog-empty h2 { font-size: 1.6rem; }
.catalog-empty p { color: var(--ink-soft); }
@media (max-width: 760px) {
  .hero-art, .hero-art img { min-height: 280px; }
  .catalog-content { padding-top: 7rem; }
  .catalog-content > h1 { font-size: 2.2rem; }
  .catalog-grid { grid-template-columns: 1fr; }
}