/* ==========================================================
   BAK Ingeniería & Arquitectura
   Paleta: negro #1c1c1e · naranja #F07316 · gris #b8b8b8
   ========================================================== */
:root{
  --dark:#1c1c1e;
  --dark-2:#26262a;
  --orange:#F07316;
  --orange-d:#d86208;
  --grey:#b8b8b8;
  --grey-d:#6b6b70;
  --light:#f3f3f1;
  --white:#fff;
  --radius:14px;
  --head:'Lato',system-ui,sans-serif;
  --body:'Lato',system-ui,sans-serif;
  --bg:#141416;
  --bg-2:#1c1c1e;
  --card:#212124;
  --line:#2e2e33;
  --text:#e9e9eb;
  --muted:#a6a6ac;
  --max:1180px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:92px}
body{margin:0;font-family:var(--body);color:var(--text);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit}
h1,h2,h3{font-family:var(--head);line-height:1.15;margin:0 0 .6em;letter-spacing:-.01em}
h2{font-size:clamp(1.7rem,3vw,2.4rem);font-weight:900}
h3{font-size:1.15rem;font-weight:700}
p{margin:0 0 1em}
.container{width:min(var(--max),92%);margin-inline:auto}

/* ---------- utilidades ---------- */
.eyebrow{font-family:var(--head);font-size:.78rem;font-weight:700;letter-spacing:.22em;text-transform:uppercase;color:var(--orange);margin-bottom:1rem}
.eyebrow--dark{color:var(--orange)}
.btn{display:inline-flex;align-items:center;gap:.5em;font-family:var(--head);font-weight:700;font-size:.92rem;letter-spacing:.04em;text-decoration:none;background:var(--orange);color:var(--white);padding:.95em 1.7em;border-radius:999px;border:2px solid var(--orange);cursor:pointer;transition:background .2s,transform .2s,color .2s}
.btn:hover{background:var(--orange-d);border-color:var(--orange-d);transform:translateY(-2px)}
.btn--ghost{background:transparent;color:var(--white);border-color:rgba(255,255,255,.35)}
.btn--ghost:hover{background:var(--white);color:var(--dark);border-color:var(--white)}
.btn--sm{padding:.6em 1.25em;font-size:.85rem}

/* datos a completar (borrador) */
.ph{background:rgba(240,115,22,.16);color:var(--orange);border-bottom:1px dashed var(--orange);padding:0 .2em;border-radius:3px;font-weight:700}
.ph-link{border-bottom:1px dashed var(--orange)}

/* ---------- logo ---------- */
.logo{display:flex;text-decoration:none}
.logo__img{height:54px;width:auto}
.footer .logo__img{height:58px}
.logo__mark{height:34px;width:auto}
.logo__chev{fill:var(--white)}
.logo__tag{font-family:var(--head);font-size:.56rem;font-weight:700;letter-spacing:.28em;text-transform:uppercase;color:var(--white);border-bottom:2px solid var(--orange);padding-bottom:4px}

/* ---------- header ---------- */
.header{position:sticky;top:0;z-index:50;background:rgba(20,20,22,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);transition:box-shadow .3s}
.header.is-scrolled{box-shadow:0 6px 24px rgba(0,0,0,.45)}
.header__inner{display:flex;align-items:center;justify-content:space-between;height:86px}
.nav{display:flex;align-items:center;gap:2rem}
.nav a:not(.btn){font-family:var(--head);font-weight:700;font-size:.95rem;text-decoration:none;position:relative;color:var(--text)}
.nav a:not(.btn)::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--orange);transition:width .25s}
.nav a:not(.btn):hover::after{width:100%}
.nav-toggle{display:none;background:none;border:0;padding:8px;cursor:pointer}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--white);margin:5px 0;transition:.3s}

/* ---------- hero ---------- */
.hero{position:relative;background:var(--bg);color:var(--white);overflow:hidden;padding:clamp(5rem,12vw,9rem) 0 0}
.hero__bg{position:absolute;inset:0 0 0 auto;width:min(60%,820px);background:url(../img/hero-trazos.jpg) center/cover no-repeat;opacity:.55;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 55%);mask-image:linear-gradient(90deg,transparent,#000 55%)}
.hero__inner{position:relative;max-width:var(--max)}
.hero h1{font-size:clamp(2.3rem,5.6vw,4.2rem);font-weight:900;max-width:14ch}
.hero h1 span{color:var(--orange)}
.hero__lead{font-size:clamp(1rem,1.4vw,1.15rem);color:#d4d4d6;max-width:56ch;margin-bottom:2.2rem}
.hero__cta{display:flex;flex-wrap:wrap;gap:1rem}
.hero__values{position:relative;display:flex;align-items:center;gap:1.4rem;margin-top:clamp(4rem,8vw,6rem);padding:1.6rem 0;border-top:1px solid rgba(255,255,255,.12);font-family:var(--head);font-size:.78rem;font-weight:700;letter-spacing:.24em;text-transform:uppercase;color:var(--grey)}
.hero__values i{width:2px;height:16px;background:var(--orange)}

/* ---------- secciones ---------- */
.section{padding:clamp(4.5rem,9vw,7.5rem) 0}
.section--alt{background:var(--bg-2)}
.section__head{text-align:center;max-width:640px;margin:0 auto 3.5rem}
.section__head p:last-child{color:var(--muted)}

.split{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(2.5rem,6vw,5rem);align-items:center}
.split__text p:not(.eyebrow){color:var(--muted)}
.checks{list-style:none;padding:0;margin:1.6rem 0 0;display:grid;gap:.7rem}
.checks li{position:relative;padding-left:1.9rem;font-weight:400}
.checks li::before{content:"";position:absolute;left:0;top:.45em;border-left:7px solid transparent;border-right:7px solid transparent;border-bottom:12px solid var(--orange)}
.split__media{position:relative;margin:0}
.split__media img{border-radius:var(--radius);width:100%;aspect-ratio:4/3.3;object-fit:cover}
.badge{position:absolute;left:-1.5rem;bottom:-1.5rem;background:var(--card);color:var(--white);padding:1.2rem 1.5rem;border-radius:var(--radius);border-left:4px solid var(--orange);box-shadow:0 18px 40px rgba(0,0,0,.25)}
.badge strong{display:block;font-family:var(--head);font-size:1.3rem;letter-spacing:.2em}
.badge span{font-size:.8rem;color:var(--grey)}

/* ---------- equipo ---------- */
.team{display:grid;grid-template-columns:repeat(3,1fr);gap:1.8rem}
.member{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:transform .3s,box-shadow .3s,border-color .3s}
.member:hover{transform:translateY(-6px);border-color:rgba(240,115,22,.5);box-shadow:0 20px 40px rgba(0,0,0,.4)}
.member__photo{position:relative;aspect-ratio:1/1;background:linear-gradient(145deg,#2c2c30,#18181b);overflow:hidden}
.member__photo:empty::before{content:attr(data-initials);position:absolute;inset:0;display:grid;place-items:center;font-family:var(--head);font-size:4.5rem;font-weight:900;color:rgba(255,255,255,.12);letter-spacing:.05em}
.member__photo::after{content:"";position:absolute;right:0;bottom:0;border-left:90px solid transparent;border-bottom:90px solid var(--orange);opacity:.9}
.member__photo img{width:100%;height:100%;object-fit:cover;filter:grayscale(1)}
.member__body{position:relative;padding:2rem 1.8rem 1.8rem;display:flex;flex-direction:column;flex:1}
.member__letter{position:absolute;top:-1.7rem;left:1.8rem;width:3.4rem;height:3.4rem;display:grid;place-items:center;background:var(--orange);color:var(--white);font-family:var(--head);font-weight:900;font-size:1.5rem;border-radius:10px;box-shadow:0 8px 20px rgba(240,115,22,.35)}
.member h3{font-size:1.35rem;margin:.6rem 0 .1rem}
.member__role{font-family:var(--head);font-size:.75rem;font-weight:700;letter-spacing:.2em;text-transform:uppercase;color:var(--orange);margin-bottom:1rem}
.member__bio{font-size:.98rem;color:var(--muted)}
.tags{list-style:none;padding:0;margin:.4rem 0 1.4rem;display:flex;flex-wrap:wrap;gap:.45rem}
.tags li{font-size:.78rem;font-weight:700;color:#d2d2d6;background:#2a2a2e;padding:.35em .8em;border-radius:999px}
.member__link{margin-top:auto;display:inline-flex;align-items:center;gap:.55rem;font-family:var(--head);font-weight:700;font-size:.85rem;text-decoration:none;color:var(--text);padding-top:1.1rem;border-top:1px solid var(--line)}
.member__link svg{width:20px;height:20px;fill:#3b8fe0;flex:none}
.member__link:hover{color:var(--orange)}
.member__link--soon{color:#76767c;pointer-events:none}
.member__link--soon svg{fill:#5a5a60}

/* ---------- servicios ---------- */
.services{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.service{padding:2.2rem 2rem;background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius);transition:border-color .3s,transform .3s}
.service:hover{border-color:var(--orange);transform:translateY(-4px)}
.service svg{width:46px;height:46px;fill:none;stroke:var(--orange);stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round;margin-bottom:1.3rem}
.service p{color:var(--muted);font-size:.95rem;margin:0}

/* ---------- banda licitaciones ---------- */
.band{background:var(--bg-2);color:var(--white);padding:clamp(4.5rem,9vw,7rem) 0;position:relative;overflow:hidden}
.band::before{content:"";position:absolute;right:-120px;top:-60px;border-left:340px solid transparent;border-right:340px solid transparent;border-bottom:480px solid rgba(240,115,22,.07)}
.band__inner{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:4rem;align-items:center}
.band__text p:last-child{color:#c9c9cc}
.pillars{list-style:none;margin:0;padding:0;display:grid;gap:1rem}
.pillars li{display:flex;align-items:center;gap:1.5rem;padding:1.3rem 1.6rem;background:var(--card);border-radius:var(--radius);border-left:3px solid var(--orange)}
.pillars strong{font-family:var(--head);font-size:2.6rem;font-weight:900;color:var(--orange);line-height:1;min-width:1.2ch}
.pillars span{color:#d4d4d6}

/* ---------- contacto ---------- */
.split--contact{align-items:start}
.contact-list{list-style:none;padding:0;margin:2rem 0 0;display:grid;gap:1.2rem}
.contact-list li{display:flex;flex-direction:column}
.contact-list span{font-family:var(--head);font-size:.72rem;font-weight:700;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.contact-list a,.contact-list em{font-size:1.1rem;font-weight:700;text-decoration:none;font-style:normal;width:fit-content;color:var(--text)}
.form{background:var(--card);border:1px solid var(--line);padding:2.2rem;border-radius:var(--radius);display:grid;gap:1.1rem}
.form__row{display:grid;grid-template-columns:1fr 1fr;gap:1.1rem}
.form label{display:grid;gap:.35rem;font-size:.85rem;font-weight:700;color:#d2d2d6}
.form input,.form textarea{font:inherit;font-weight:400;padding:.85em 1em;border:1px solid #38383e;border-radius:10px;background:var(--bg);color:var(--text);transition:border-color .2s,box-shadow .2s}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--orange);box-shadow:0 0 0 3px rgba(240,115,22,.15)}
.form .btn{justify-self:start}

/* ---------- footer ---------- */
.footer{background:#0c0c0e;border-top:1px solid var(--line);color:var(--grey);padding:3.5rem 0 2.5rem}
.footer__inner{display:flex;flex-direction:column;align-items:center;text-align:center;gap:1rem}
.footer .logo{align-items:center}
.footer p{margin:0;font-size:.85rem}
.footer__copy{font-size:.78rem!important;color:var(--grey-d)}

/* ---------- animación ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.is-visible{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:980px){
  .team,.services{grid-template-columns:1fr 1fr}
  .split,.band__inner{grid-template-columns:1fr}
  .badge{left:1rem}
}
@media (max-width:760px){
  .nav-toggle{display:block}
  .nav{position:fixed;inset:86px 0 auto 0;flex-direction:column;align-items:stretch;gap:0;background:var(--bg);padding:1rem 4% 1.5rem;box-shadow:0 20px 30px rgba(0,0,0,.5);transform:translateY(-130%);transition:transform .35s}
  .nav.is-open{transform:none}
  .nav a:not(.btn){padding:.9rem 0;border-bottom:1px solid var(--line)}
  .nav .btn{margin-top:1rem;justify-content:center}
  .nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
  .nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .team,.services,.form__row{grid-template-columns:1fr}
  .hero__bg{width:100%;opacity:.25}
  .hero__values{gap:.9rem;font-size:.68rem;letter-spacing:.16em}
}

/* ==========================================================
   EFECTOS
   ========================================================== */
/* barra de progreso de lectura */
.progress{position:fixed;top:0;left:0;height:3px;width:100%;background:var(--orange);transform-origin:0 50%;transform:scaleX(0);z-index:100;box-shadow:0 0 10px rgba(240,115,22,.6)}

/* nav: sección activa */
.nav a.is-active:not(.btn){color:var(--orange)}
.nav a.is-active:not(.btn)::after{width:100%}

/* hero: entrada escalonada */
.hero-in{opacity:0;transform:translateY(24px);animation:heroIn .9s cubic-bezier(.2,.7,.2,1) forwards}
.hero__inner .hero-in:nth-child(1){animation-delay:.15s}
.hero__inner .hero-in:nth-child(2){animation-delay:.3s}
.hero__inner .hero-in:nth-child(3){animation-delay:.5s}
.hero__inner .hero-in:nth-child(4){animation-delay:.7s}
.hero__values.hero-in{animation-delay:.9s}
@keyframes heroIn{to{opacity:1;transform:none}}
.hero h1 span{background:linear-gradient(90deg,var(--orange),#ffa451,var(--orange));background-size:200% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:shine 6s linear infinite}
@keyframes shine{to{background-position:-200% 0}}
.hero__bg{will-change:transform}

/* hero: trazos que se dibujan */
.hero__lines{position:absolute;right:0;top:0;width:min(55%,760px);height:100%;pointer-events:none;opacity:.9}
.hero__lines .ln{fill:none;stroke:var(--orange);stroke-width:1.6;stroke-dasharray:1400;stroke-dashoffset:1400;opacity:.55;animation:draw 3s ease forwards .6s}
.hero__lines .ln--2{stroke-width:1.2;opacity:.35;animation-delay:1.2s}
.hero__lines .ln--3{stroke:#fff;stroke-width:.8;opacity:.12;stroke-dasharray:6 8;stroke-dashoffset:0;animation:dashMove 30s linear infinite}
.hero__lines .ln--4{stroke:#fff;stroke-width:1;opacity:.35;animation-delay:2s}
@keyframes draw{to{stroke-dashoffset:0}}
@keyframes dashMove{to{stroke-dashoffset:-600}}
.hero__lines .dot{fill:var(--orange);opacity:0;transform-box:fill-box;transform-origin:center;animation:dotIn .5s forwards 2.6s,pulse 2.4s ease-in-out infinite 3.1s}
.hero__lines .dot--2{animation-delay:2.8s,3.3s}
.hero__lines .dot--3{animation-delay:3s,3.5s}
@keyframes dotIn{to{opacity:1}}
@keyframes pulse{0%,100%{transform:scale(1);opacity:1}50%{transform:scale(1.8);opacity:.5}}

/* cinta de servicios en movimiento */
.ticker{background:var(--orange);color:#141416;overflow:hidden;padding:.95rem 0;border-block:1px solid #ff8d33}
.ticker__track{display:flex;align-items:center;gap:2.2rem;width:max-content;animation:ticker 38s linear infinite}
.ticker:hover .ticker__track{animation-play-state:paused}
.ticker span{font-family:var(--head);font-weight:900;font-size:.9rem;letter-spacing:.2em;text-transform:uppercase;white-space:nowrap}
.ticker i{width:0;height:0;border-left:7px solid transparent;border-right:7px solid transparent;border-bottom:12px solid #141416;flex:none}
@keyframes ticker{to{transform:translateX(-50%)}}

/* títulos: línea naranja que se extiende */
.section h2::after,.band h2::after{content:"";display:block;width:0;height:3px;margin-top:.9rem;background:var(--orange);border-radius:3px;transition:width .9s cubic-bezier(.2,.7,.2,1) .3s}
.section__head h2::after{margin-inline:auto}
.is-visible h2::after,.is-visible.section__head h2::after{width:64px}

/* tarjetas: luz que sigue al mouse */
.member,.service{position:relative;isolation:isolate}
.member::before,.service::before{content:"";position:absolute;inset:0;border-radius:inherit;background:radial-gradient(420px circle at var(--mx,50%) var(--my,50%),rgba(240,115,22,.13),transparent 45%);opacity:0;transition:opacity .35s;z-index:-1;pointer-events:none}
.member:hover::before,.service:hover::before{opacity:1}
.member__body{z-index:1}
.service svg{transition:transform .4s cubic-bezier(.2,.7,.2,1)}
.service:hover svg{transform:translateY(-4px) scale(1.08)}
.member__photo::after{transition:border-width .4s ease}
.member:hover .member__photo::after{border-left-width:130px;border-bottom-width:130px}
.member__letter{transition:transform .4s cubic-bezier(.2,.7,.2,1)}
.member:hover .member__letter{transform:rotate(-8deg) scale(1.08)}

/* imagen nosotros: leve zoom */
.split__media{overflow:visible}
.split__media img{transition:transform 1.2s cubic-bezier(.2,.7,.2,1)}
.split__media:hover img{transform:scale(1.03)}

/* banda: triángulos flotantes */
.band::after{content:"";position:absolute;left:8%;bottom:-40px;border-left:60px solid transparent;border-right:60px solid transparent;border-bottom:90px solid rgba(240,115,22,.08);animation:float 9s ease-in-out infinite}
.band::before{animation:float 12s ease-in-out infinite reverse}
@keyframes float{0%,100%{transform:translateY(0) rotate(0)}50%{transform:translateY(-22px) rotate(4deg)}}
.pillars li{transition:transform .3s,background .3s}
.pillars li:hover{transform:translateX(8px);background:#28282c}

/* botón volver arriba */
.to-top{position:fixed;right:1.4rem;bottom:1.4rem;width:48px;height:48px;border-radius:50%;background:var(--orange);display:grid;place-items:center;box-shadow:0 10px 25px rgba(240,115,22,.35);opacity:0;transform:translateY(20px);pointer-events:none;transition:opacity .3s,transform .3s,background .2s;z-index:60}
.to-top.is-shown{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{background:var(--orange-d)}
.to-top svg{width:22px;height:22px;fill:none;stroke:#fff;stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round}

@media (max-width:760px){.hero__lines{width:100%;opacity:.35}.member__photo{aspect-ratio:16/10}.hero .eyebrow{letter-spacing:.14em;font-size:.7rem}}

/* mensaje del formulario */
.form__msg{margin:0;font-size:.92rem;font-weight:700;min-height:1.4em}
.form__msg.is-ok{color:#5fd38d}
.form__msg.is-error{color:#ff8a65}
.form input.is-invalid,.form textarea.is-invalid{border-color:#ff8a65}
/* selección de texto en naranja */
::selection{background:var(--orange);color:#fff}
/* foco visible para teclado */
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible{outline:2px solid var(--orange);outline-offset:3px}