/* ==========================================================
   SAZURIN — Estilos
   ========================================================== */
:root {
  --orange: #fe3300;
  --orange-2: #db2c00;
  --black: #0d0d0e;
  --ink: #151618;
  --ink-2: #1e2023;
  --grey: #f3f3f1;
  --line: #e2e2de;
  --text: #1a1b1d;
  --muted: #62666b;
  --font-head: "Saira", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { margin: 0; font-family: var(--font-body); color: var(--text); line-height: 1.65; background: #fff; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.05; margin: 0 0 .5em; }
.container { width: min(1200px, 100% - 40px); margin-inline: auto; }

.eyebrow { font: 700 .8rem var(--font-head); letter-spacing: .22em; text-transform: uppercase; color: var(--orange); margin: 0 0 1rem; display: flex; align-items: center; gap: .7rem; }
.eyebrow::before { content: ""; width: 0; height: 0; border-left: 7px solid transparent; border-right: 7px solid transparent; border-bottom: 12px solid currentColor; }
.eyebrow--dark { color: var(--orange-2); }

/* ---------- Botones ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 1em 1.8em; border: 2px solid transparent; font: 700 .9rem var(--font-head); letter-spacing: .1em; text-transform: uppercase; cursor: pointer; text-decoration: none; transition: background .2s, color .2s, border-color .2s, transform .15s; clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%); }
.btn:hover { transform: translateY(-2px); }
.btn--accent { background: var(--orange); color: #fff; }
.btn--accent:hover { background: var(--orange-2); }
.btn--line { color: #fff; border-color: rgba(255,255,255,.6); }
.btn--line:hover { background: #fff; color: var(--black); }
.btn--light { background: #fff; color: var(--black); }
.btn--light:hover { background: var(--black); color: #fff; }
.btn--sm { padding: .7em 1.2em; font-size: .78rem; }
.btn--block { width: 100%; }

/* ---------- Header ---------- */
.header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.97); backdrop-filter: blur(8px); border-bottom: 1px solid transparent; transition: box-shadow .2s, border-color .2s; }
.header.is-scrolled { box-shadow: 0 6px 22px rgba(0,0,0,.08); border-color: var(--line); }
.header__inner { display: flex; align-items: center; justify-content: space-between; height: 80px; }
.logo img { height: 36px; width: auto; }
.nav { display: flex; align-items: center; gap: 1.8rem; }
.nav a:not(.btn) { text-decoration: none; font: 600 .95rem var(--font-head); letter-spacing: .03em; position: relative; }
.nav a:not(.btn)::after { content: ""; position: absolute; left: 0; bottom: -6px; height: 3px; width: 0; background: var(--orange); transition: width .2s; }
.nav a:not(.btn):hover::after, .nav a.is-active::after { width: 100%; }
.nav-toggle { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.nav-toggle span { display: block; width: 26px; height: 2px; background: var(--black); margin: 6px 0; transition: .25s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- Carrusel ---------- */
.hero { position: relative; height: calc(100vh - 80px); min-height: 560px; max-height: 860px; color: #fff; overflow: hidden; background: var(--black); }
.slides { position: absolute; inset: 0; }
.slide { position: absolute; inset: 0; display: flex; align-items: center; opacity: 0; visibility: hidden; transition: opacity 1s ease, visibility 1s; }
.slide::before { content: ""; position: absolute; inset: 0; background: var(--bg) center/cover no-repeat; transform: scale(1.08); transition: transform 7s ease-out; }
.slide::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(10,10,11,.92) 0%, rgba(10,10,11,.75) 50%, rgba(10,10,11,.25) 100%); }
.slide.is-active { opacity: 1; visibility: visible; }
.slide.is-active::before { transform: scale(1); }
.slide__content { position: relative; z-index: 1; padding-bottom: 90px; }
.slide__content > * { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.slide.is-active .slide__content > * { opacity: 1; transform: none; }
.slide.is-active .slide__content > :nth-child(2) { transition-delay: .15s; }
.slide.is-active .slide__content > :nth-child(3) { transition-delay: .3s; }
.hero h1, .slide__title { font-size: clamp(2.5rem, 6vw, 5rem); font-weight: 800; text-transform: uppercase; letter-spacing: -.01em; max-width: 15ch; margin-bottom: .35em; }
.hero h1 span, .slide__title span { color: var(--orange); }
.slide__lead { font-size: 1.15rem; color: #d9dadc; max-width: 560px; margin: 0; }
.hero__ui { position: absolute; left: 0; right: 0; bottom: 48px; z-index: 2; display: flex; justify-content: space-between; align-items: center; gap: 1.5rem; flex-wrap: wrap; }
.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.carousel__ctrl { display: flex; align-items: center; gap: 1rem; }
.carousel__arrow { width: 48px; height: 48px; border: 1px solid rgba(255,255,255,.4); background: transparent; color: #fff; font-size: 1.8rem; line-height: 1; cursor: pointer; display: grid; place-items: center; transition: background .2s, border-color .2s; }
.carousel__arrow:hover { background: var(--orange); border-color: var(--orange); }
.carousel__dots { display: flex; gap: .5rem; }
.carousel__dots button { width: 34px; height: 4px; padding: 0; border: 0; background: rgba(255,255,255,.35); cursor: pointer; transition: background .2s, width .3s; }
.carousel__dots button[aria-selected="true"] { background: var(--orange); width: 54px; }
.hero__progress { position: absolute; left: 0; right: 0; bottom: 0; height: 4px; background: rgba(255,255,255,.1); z-index: 2; }
.hero__progress span { display: block; height: 100%; width: 0; background: var(--orange); }

/* ---------- Cinta ---------- */
.strip { background: var(--orange); color: #fff; }
.strip__inner { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: .6rem 1.4rem; padding: 1rem 0; font: 700 1.15rem var(--font-head); text-transform: uppercase; letter-spacing: .06em; }
.strip i { width: 0; height: 0; border-left: 6px solid transparent; border-right: 6px solid transparent; border-bottom: 10px solid var(--black); }

/* ---------- Secciones ---------- */
.section { padding: clamp(75px, 10vw, 120px) 0; }
.section--grey { background: var(--grey); }
.section--dark { background: var(--ink); color: #fff; }
.section__head { margin-bottom: 3rem; }
.section__head--row { display: flex; justify-content: space-between; align-items: flex-end; gap: 1.5rem 3rem; flex-wrap: wrap; }
.section__sub { color: #a9adb2; margin: 0; max-width: 460px; }
.section__sub--dark { color: var(--muted); }
.title { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; color: var(--black); text-transform: uppercase; letter-spacing: -.01em; }
.title--light { color: #fff; }

/* ---------- Nosotros ---------- */
.about { display: grid; grid-template-columns: auto 1fr; gap: clamp(30px, 6vw, 80px); align-items: start; margin-bottom: 4.5rem; }
.about__stat { background: var(--orange); color: #fff; padding: 2rem 2.4rem; clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%); }
.about__stat strong { display: block; font: 800 5rem/1 var(--font-head); }
.about__stat span { font: 600 1.1rem/1.2 var(--font-head); text-transform: uppercase; letter-spacing: .05em; }
.about__cols { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
.about__cols .title { font-size: clamp(1.5rem, 2.6vw, 2rem); }
.about__cols p:not(.eyebrow) { color: var(--muted); margin: 0; }
.values__title { font-size: 1.1rem; text-transform: uppercase; letter-spacing: .14em; color: var(--muted); margin-bottom: 1.4rem; }
.values { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; border-top: 3px solid var(--black); }
.value { padding: 1.8rem 1.4rem 1.4rem 0; border-right: 1px solid var(--line); padding-left: 1.4rem; transition: background .2s; }
.value:first-child { padding-left: 0; }
.value:last-child { border-right: 0; }
.value__icon { width: 46px; height: 46px; display: grid; place-items: center; background: var(--black); margin-bottom: 1rem; transition: background .2s; }
.value:hover .value__icon { background: var(--orange); }
.value__icon svg { width: 22px; height: 22px; fill: none; stroke: #fff; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.value h4 { font-size: 1.2rem; text-transform: uppercase; margin-bottom: .3rem; }
.value p { margin: 0; color: var(--muted); font-size: .9rem; }

/* ---------- Servicios ---------- */
.services { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.08); }
.service { background: var(--ink); padding: 2.2rem 1.8rem; position: relative; transition: background .25s; }
.service::before { content: ""; position: absolute; left: 0; top: 0; width: 0; height: 4px; background: var(--orange); transition: width .3s; }
.service:hover { background: var(--ink-2); }
.service:hover::before { width: 100%; }
.service__head { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 1.4rem; }
.service__icon { width: 60px; height: 60px; display: grid; place-items: center; background: var(--orange); clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%); }
.service__icon svg { width: 30px; height: 30px; fill: none; stroke: #fff; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.service__num { font: 800 2.4rem/1 var(--font-head); color: rgba(255,255,255,.08); }
.service h3 { font-size: 1.45rem; text-transform: uppercase; }
.service ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .55rem; }
.service li { position: relative; padding-left: 1.1rem; color: #b8bcc1; font-size: .92rem; line-height: 1.45; }
.service li::before { content: ""; position: absolute; left: 0; top: .5em; width: 6px; height: 6px; background: var(--orange); }

/* ---------- Ingeniería ---------- */
.eng { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(36px, 6vw, 80px); align-items: center; }
.eng__media { position: relative; }
.eng__media img { width: 100%; aspect-ratio: 4/5; object-fit: cover; clip-path: polygon(0 0, 100% 0, 100% calc(100% - 50px), calc(100% - 50px) 100%, 0 100%); }
.eng__media::after { content: ""; position: absolute; right: -14px; bottom: -14px; width: 120px; height: 120px; background: var(--orange); z-index: -1; }
.eng__list { list-style: none; padding: 0; margin: 1.5rem 0 0; columns: 2; column-gap: 2rem; }
.eng__list li { break-inside: avoid; padding: .7rem 0 .7rem 1.6rem; border-bottom: 1px solid var(--line); position: relative; font-weight: 500; font-size: .95rem; }
.eng__list li::before { content: "✓"; position: absolute; left: 0; color: var(--orange); font-weight: 800; }

/* ---------- Desarrollo civil ---------- */
.civil { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.civil__item { background: #fff; padding: 2rem 1.6rem; border-bottom: 4px solid var(--black); transition: transform .2s, border-color .2s; }
.civil__item:hover { transform: translateY(-4px); border-color: var(--orange); }
.civil__item span { font: 800 .9rem var(--font-head); color: var(--orange); }
.civil__item h3 { font-size: 1.3rem; text-transform: uppercase; margin: 1rem 0 .6rem; }
.civil__item p { margin: 0; color: var(--muted); font-size: .92rem; }
.civil__item--accent { background: var(--black); color: #fff; border-color: var(--orange); }
.civil__item--accent p { color: #b8bcc1; }

/* ---------- Portfolio ---------- */
.filters { display: flex; flex-wrap: wrap; gap: .5rem; }
.filter { font: 600 .88rem var(--font-head); padding: .6em 1.15em; border: 1px solid var(--line); background: #fff; color: var(--text); cursor: pointer; transition: .2s; }
.filter:hover { border-color: var(--orange); color: var(--orange-2); }
.filter.is-active { background: var(--black); color: #fff; border-color: var(--black); }
.projects { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.project { border: 1px solid var(--line); padding: 1.6rem; position: relative; background: #fff; transition: border-color .2s, box-shadow .2s, transform .2s; }
.project::before { content: ""; position: absolute; left: -1px; top: -1px; width: 4px; height: calc(100% + 2px); background: var(--orange); transform: scaleY(0); transform-origin: top; transition: transform .3s; }
.project:hover { box-shadow: 0 16px 40px rgba(0,0,0,.08); transform: translateY(-3px); }
.project:hover::before { transform: scaleY(1); }
.project.is-hidden { display: none; }
.project__top { display: flex; justify-content: space-between; align-items: center; gap: .5rem; margin-bottom: 1rem; }
.project__year { font: 800 .85rem var(--font-head); color: #fff; background: var(--black); padding: .25em .6em; }
.project__type { font: 600 .72rem var(--font-head); letter-spacing: .1em; text-transform: uppercase; color: var(--orange-2); text-align: right; }
.project h3 { font-size: 1.2rem; margin-bottom: .3rem; }
.project__loc { font-size: .85rem; color: var(--muted); margin: 0 0 .8rem; display: flex; align-items: center; gap: .4rem; }
.project__loc::before { content: ""; width: 8px; height: 8px; background: var(--orange); clip-path: polygon(50% 0, 100% 100%, 0 100%); }
.project p:last-child { margin: 0; color: var(--muted); font-size: .9rem; }

.project__media { display: none; margin: -1.6rem -1.6rem 1.2rem; aspect-ratio: 16/10; background: var(--grey) center/cover no-repeat; position: relative; cursor: zoom-in; overflow: hidden; }
.project.has-photos .project__media { display: block; }
.project__count { position: absolute; right: .7rem; bottom: .7rem; font: 700 .72rem var(--font-head); letter-spacing: .06em; background: rgba(13,13,14,.8); color: #fff; padding: .3em .7em; }

/* ---------- Lightbox ---------- */
.lightbox { position: fixed; inset: 0; z-index: 100; background: rgba(10,10,11,.95); display: flex; align-items: center; justify-content: center; padding: 20px; opacity: 0; visibility: hidden; transition: opacity .25s, visibility .25s; }
.lightbox.is-open { opacity: 1; visibility: visible; }
.lightbox figure { margin: 0; text-align: center; max-width: min(1050px, 100%); }
.lightbox img { max-height: 80vh; margin: 0 auto; }
.lightbox figcaption { color: #fff; margin-top: 1rem; font: 600 .95rem var(--font-head); letter-spacing: .04em; }
.lightbox__close, .lightbox__nav { position: absolute; width: 50px; height: 50px; border: 1px solid rgba(255,255,255,.35); background: transparent; color: #fff; font-size: 1.9rem; line-height: 1; cursor: pointer; display: grid; place-items: center; transition: background .2s, border-color .2s; }
.lightbox__close:hover, .lightbox__nav:hover { background: var(--orange); border-color: var(--orange); }
.lightbox__close { top: 20px; right: 20px; }
.lightbox__prev { left: 20px; top: 50%; transform: translateY(-50%); }
.lightbox__next { right: 20px; top: 50%; transform: translateY(-50%); }
@media (max-width: 600px) { .lightbox__nav { top: auto; bottom: 20px; transform: none; } .lightbox__prev { left: calc(50% - 60px); } .lightbox__next { right: calc(50% - 60px); } }

/* ---------- CTA ---------- */
.cta { position: relative; color: #fff; background: url("img/slide-4.jpg") center/cover; }
.cta::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(254,51,0,.95), rgba(219,44,0,.85)); }
.cta__inner { position: relative; display: flex; justify-content: space-between; align-items: center; gap: 2rem; padding: 3.5rem 0; flex-wrap: wrap; }
.cta h2 { font-size: clamp(1.7rem, 3.2vw, 2.5rem); font-weight: 800; text-transform: uppercase; margin-bottom: .3rem; }
.cta p { margin: 0; color: #ffe2d8; }

/* ---------- Contacto ---------- */
.contact { display: grid; grid-template-columns: 1fr 1.05fr; gap: clamp(36px, 6vw, 80px); align-items: start; }
.contact__list { list-style: none; padding: 0; margin: 1.8rem 0 0; display: grid; gap: 1.2rem; }
.contact__list li { display: flex; gap: 1rem; align-items: center; }
.contact__list small { display: block; font: 700 .7rem var(--font-head); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.contact__list a { font-weight: 600; color: var(--black); text-decoration: none; word-break: break-word; font-size: 1.02rem; }
.contact__list a:hover { color: var(--orange-2); }
.contact__icon { flex: none; width: 48px; height: 48px; display: grid; place-items: center; background: var(--black); }
.contact__icon svg { width: 21px; height: 21px; fill: none; stroke: var(--orange); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.form { background: #fff; padding: 2.2rem; display: grid; gap: 1.1rem; border-top: 4px solid var(--orange); box-shadow: 0 20px 50px rgba(0,0,0,.07); }
.form h3 { font-size: 1.6rem; text-transform: uppercase; margin: 0; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form label { display: grid; gap: .4rem; font: 600 .78rem var(--font-head); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.form input, .form select, .form textarea { font: 400 1rem var(--font-body); color: var(--text); padding: .85em 1em; width: 100%; border: 1px solid var(--line); border-radius: 0; background: var(--grey); transition: border-color .2s, box-shadow .2s; text-transform: none; letter-spacing: 0; }
.form textarea { resize: vertical; }
.form input:focus, .form select:focus, .form textarea:focus { outline: none; border-color: var(--orange); box-shadow: 0 0 0 3px rgba(254,51,0,.15); background: #fff; }
.form .is-invalid { border-color: #c62828; }
.form__error { color: #c62828; font-size: .88rem; margin: 0; }
.form__note { margin: 0; font-size: .9rem; color: var(--muted); text-align: center; }
.form__error:empty, .form__note:empty { display: none; }

/* ---------- Mapa ---------- */
.map { line-height: 0; background: var(--grey); }
.map iframe { width: 100%; height: 400px; border: 0; filter: grayscale(.85); }

/* ---------- Footer ---------- */
.footer { background: var(--black); color: #9a9ea3; padding-top: 60px; font-size: .92rem; }
.footer__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 3rem; padding-bottom: 45px; }
.footer__logo { height: 34px; width: auto; margin-bottom: 1.3rem; }
.footer h4 { color: #fff; font-size: .95rem; letter-spacing: .14em; text-transform: uppercase; }
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .5rem; }
.footer a { color: #d6d8db; text-decoration: none; }
.footer a:hover { color: var(--orange); }
.footer p { max-width: 320px; }
.footer__bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem; padding: 1.3rem 0; border-top: 1px solid rgba(255,255,255,.08); font-size: .82rem; }

/* ---------- WhatsApp flotante ---------- */
.wa-float { position: fixed; right: 22px; bottom: 22px; z-index: 60; width: 58px; height: 58px; border-radius: 50%; background: #1fae55; display: grid; place-items: center; box-shadow: 0 10px 25px rgba(31,174,85,.45); transition: transform .2s; }
.wa-float:hover { transform: scale(1.08); }
.wa-float svg { width: 30px; height: 30px; fill: #fff; }

/* ---------- Animación de entrada ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .slide, .slide::before, .slide__content > * { transition: none !important; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .services, .civil { grid-template-columns: repeat(2, 1fr); }
  .values { grid-template-columns: repeat(3, 1fr); row-gap: 1rem; }
  .value:nth-child(3) { border-right: 0; }
  .value:nth-child(4) { padding-left: 0; }
  .projects { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav { position: fixed; top: 80px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; background: #fff; padding: .5rem 20px 1.5rem; border-bottom: 1px solid var(--line); box-shadow: 0 10px 30px rgba(0,0,0,.08); transform: translateY(-130%); transition: transform .3s ease; z-index: -1; }
  .nav.is-open { transform: none; }
  .nav a:not(.btn) { padding: 1rem 0; border-bottom: 1px solid var(--line); }
  .nav a:not(.btn)::after { display: none; }
  .nav .btn { margin-top: 1.2rem; }
  .about { grid-template-columns: 1fr; }
  .about__stat { justify-self: start; display: flex; align-items: center; gap: 1rem; padding: 1.4rem 2rem; }
  .about__stat strong { font-size: 3.6rem; }
  .about__cols { grid-template-columns: 1fr; gap: 2.5rem; }
  .eng, .contact { grid-template-columns: 1fr; }
  .eng__media { max-width: 440px; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__grid > div:first-child { grid-column: 1 / -1; }
}
@media (max-width: 600px) {
  .logo img { height: 28px; }
  .hero { height: auto; min-height: 620px; }
  .slide { align-items: flex-start; padding-top: 70px; }
  .slide::after { background: linear-gradient(180deg, rgba(10,10,11,.75), rgba(10,10,11,.85)); }
  .hero__ui { bottom: 28px; }
  .hero__actions { width: 100%; }
  .hero__actions .btn { flex: 1; padding: 1em .8em; }
  .carousel__ctrl { width: 100%; justify-content: space-between; }
  .services, .civil, .projects { grid-template-columns: 1fr; }
  .values { grid-template-columns: 1fr 1fr; }
  .value { padding-left: 0 !important; border-right: 0; padding-right: 1rem; }
  .eng__list { columns: 1; }
  .strip__inner { font-size: .9rem; gap: .4rem .9rem; }
  .strip i { border-left-width: 4px; border-right-width: 4px; border-bottom-width: 7px; }
  .form { padding: 1.5rem; }
  .form__row { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
}