/* ==========================================================================
   Kutai Structural Engineering — Stylesheet
   Clean / refined / bold display type, soft gradients, generous whitespace.
   Built with logical properties so the HE (rtl) / EN (ltr) toggle mirrors
   automatically without duplicate layout rules.
   ========================================================================== */

:root{
  --ink:        #14181f;
  --ink-soft:   #363c47;
  --muted:      #6b7280;
  --paper:      #faf8f5;
  --paper-2:    #ffffff;
  --line:       #e7e1d6;
  --cream-1:    #fdf1e2;
  --cream-2:    #f4dfc0;
  --accent:     #23507e;
  --accent-2:   #3a6ea8;
  --accent-soft:#e7edf4;
  --radius-lg:  28px;
  --radius-md:  18px;
  --radius-sm:  10px;
  --shadow-soft: 0 20px 45px -25px rgba(20,24,31,.35);
  --shadow-card: 0 14px 30px -18px rgba(20,24,31,.28);
  --maxw: 1240px;
  --pad-inline: clamp(20px, 5vw, 64px);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Rubik", "Segoe UI", Arial, sans-serif;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{margin:0;padding:0;list-style:none;}
h1,h2,h3,p{margin:0;}
button{font-family:inherit;}

/* language visibility toggle --------------------------------------------- */
html[data-lang="he"] [data-en]{display:none !important;}
html[data-lang="en"] [data-he]{display:none !important;}

.wrap{
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--pad-inline);
}

/* reveal-on-scroll --------------------------------------------------------*/
.reveal{opacity:0; transform:translateY(22px); transition:opacity .7s ease, transform .7s ease;}
.reveal.is-visible{opacity:1; transform:translateY(0);}

/* ==========================================================================
   Top bar / notice
   ========================================================================== */
.topbar{
  background:var(--ink);
  color:#fff;
  font-size:.82rem;
  letter-spacing:.02em;
}
.topbar .wrap{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding-block:9px;
  gap:16px;
}
.topbar-contacts{display:flex; gap:20px; flex-wrap:wrap;}
.topbar-contacts a{opacity:.88; transition:opacity .2s;}
.topbar-contacts a:hover{opacity:1;}
.topbar-license{opacity:.7;}

/* ==========================================================================
   Header / Nav
   ========================================================================== */
.site-header{
  position:sticky; top:0; z-index:100;
  background:rgba(250,248,245,.86);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid transparent;
  transition:border-color .3s, box-shadow .3s;
}
.site-header.scrolled{
  border-color:var(--line);
  box-shadow:0 8px 24px -20px rgba(20,24,31,.4);
}
.site-header .wrap{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding-block:16px;
}
.logo{
  display:flex;
  flex-direction:column;
  line-height:1.05;
  font-weight:800;
  font-size:1.28rem;
  letter-spacing:.01em;
}
.logo small{
  font-weight:500;
  font-size:.56rem;
  letter-spacing:.16em;
  color:var(--muted);
  text-transform:uppercase;
  margin-top:2px;
}

.main-nav{display:flex; align-items:center; gap:36px;}
.main-nav a{
  font-size:.95rem;
  font-weight:500;
  color:var(--ink-soft);
  position:relative;
  padding-block:6px;
}
.main-nav a::after{
  content:"";
  position:absolute; inset-inline-start:0; bottom:0;
  width:0; height:2px; background:var(--accent);
  transition:width .25s ease;
}
.main-nav a:hover{color:var(--ink);}
.main-nav a:hover::after{width:100%;}

.header-actions{display:flex; align-items:center; gap:14px;}

.lang-toggle{
  display:flex; align-items:center;
  border:1px solid var(--line);
  border-radius:999px;
  padding:4px;
  background:#fff;
}
.lang-toggle button{
  border:none; background:transparent; cursor:pointer;
  padding:6px 14px; border-radius:999px;
  font-size:.78rem; font-weight:700; letter-spacing:.03em;
  color:var(--muted);
  transition:background .2s, color .2s;
}
.lang-toggle button.active{background:var(--ink); color:#fff;}

.btn{
  display:inline-flex; align-items:center; gap:8px;
  background:var(--ink); color:#fff;
  padding:12px 24px; border-radius:999px;
  font-size:.9rem; font-weight:600;
  border:none; cursor:pointer;
  transition:transform .25s ease, background .25s ease, box-shadow .25s ease;
  white-space:nowrap;
}
.btn:hover{background:var(--accent); transform:translateY(-2px); box-shadow:var(--shadow-card);}
.btn-ghost{
  background:transparent; color:var(--ink);
  border:1.5px solid var(--ink);
}
.btn-ghost:hover{background:var(--ink); color:#fff;}

.nav-toggle{
  display:none;
  width:44px;height:44px;
  border-radius:12px;
  border:1px solid var(--line);
  background:#fff;
  align-items:center; justify-content:center;
  cursor:pointer;
}
.nav-toggle span{
  display:block; width:20px; height:2px; background:var(--ink); position:relative;
}
.nav-toggle span::before,.nav-toggle span::after{
  content:""; position:absolute; inset-inline-start:0; width:20px; height:2px; background:var(--ink);
  transition:transform .25s ease;
}
.nav-toggle span::before{top:-6px;}
.nav-toggle span::after{top:6px;}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero{
  position:relative;
  padding-block:clamp(52px, 8vw, 92px) clamp(40px,6vw,70px);
  background:
    radial-gradient(120% 100% at 15% 0%, var(--cream-1) 0%, rgba(253,241,226,0) 55%),
    radial-gradient(90% 90% at 100% 10%, var(--cream-2) 0%, rgba(244,223,192,0) 60%),
    var(--paper);
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute; inset:0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:64px 64px;
  opacity:.35;
  mask-image:radial-gradient(70% 60% at 30% 20%, #000 0%, transparent 75%);
  pointer-events:none;
}
.hero .wrap{position:relative;}
.hero-grid{
  display:grid;
  grid-template-columns:1.05fr .95fr;
  gap:clamp(28px,5vw,60px);
  align-items:center;
}
.badge-pill{
  display:inline-flex; align-items:center; gap:8px;
  background:#fff; border:1px solid var(--line);
  padding:8px 16px; border-radius:999px;
  font-size:.82rem; font-weight:600; color:var(--ink-soft);
  box-shadow:var(--shadow-card);
  margin-bottom:22px;
}
.badge-pill .dot{width:8px;height:8px;border-radius:50%;background:#3a9a5c;flex:none;}

.hero-title{
  font-size:clamp(2.6rem, 5.6vw, 4.6rem);
  font-weight:800;
  line-height:1.04;
  letter-spacing:-0.01em;
  margin-bottom:18px;
}
.hero-title .accent-underline{
  position:relative;
  display:inline-block;
}
.hero-title .accent-underline svg{
  position:absolute; inset-inline-start:0; bottom:-.08em;
  width:100%; height:.28em;
  color:var(--accent-2);
}

.hero-sub{
  font-size:clamp(1.05rem,1.6vw,1.25rem);
  font-weight:600;
  color:var(--accent);
  margin-bottom:16px;
}
.hero-text{
  font-size:1.02rem;
  color:var(--ink-soft);
  max-width:46ch;
  line-height:1.75;
  margin-bottom:30px;
}
.hero-ctas{display:flex; gap:14px; flex-wrap:wrap; margin-bottom:38px;}

.hero-stats{
  display:flex; gap:clamp(20px,4vw,44px); flex-wrap:wrap;
}
.stat-num{
  font-size:clamp(1.8rem,3vw,2.4rem);
  font-weight:800;
  color:var(--ink);
  display:flex; align-items:baseline; gap:2px;
}
.stat-label{
  font-size:.82rem; color:var(--muted); font-weight:500; margin-top:2px;
}

.hero-visual{
  position:relative;
  border-radius:var(--radius-lg);
  overflow:hidden;
  box-shadow:var(--shadow-soft);
  aspect-ratio:4/5;
}
.hero-visual img{
  width:100%; height:100%; object-fit:cover;
  transform:scale(1.02);
}
.hero-visual .cap{
  position:absolute; inset-inline-start:18px; bottom:18px;
  background:rgba(20,24,31,.72);
  color:#fff; backdrop-filter:blur(6px);
  padding:10px 16px; border-radius:999px;
  font-size:.8rem; font-weight:600;
}
.hero-visual-note{
  position:absolute; top:18px; inset-inline-end:18px;
  background:#fff; padding:8px 14px; border-radius:999px;
  font-size:.74rem; font-weight:700; color:var(--ink-soft);
  box-shadow:var(--shadow-card);
}

/* client strip ------------------------------------------------------------*/
.clients-strip{
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding-block:26px;
}
.clients-strip .wrap{
  display:flex; align-items:center; gap:28px; flex-wrap:wrap;
  justify-content:space-between;
}
.clients-label{
  font-size:.78rem; font-weight:700; letter-spacing:.08em;
  color:var(--muted); text-transform:uppercase; flex:none;
}
.clients-list{display:flex; gap:clamp(18px,4vw,44px); flex-wrap:wrap;}
.clients-list span{
  font-weight:700; font-size:1.02rem; color:var(--ink-soft); opacity:.75;
  white-space:nowrap;
}

/* ==========================================================================
   Section shell
   ========================================================================== */
.section{padding-block:clamp(64px,9vw,110px);}
.section-alt{background:var(--paper-2); border-block:1px solid var(--line);}
.eyebrow{
  display:inline-block;
  font-size:.78rem; font-weight:700; letter-spacing:.1em;
  text-transform:uppercase; color:var(--accent);
  margin-bottom:14px;
}
.section-head{
  display:flex; justify-content:space-between; align-items:flex-end;
  gap:24px; margin-bottom:44px; flex-wrap:wrap;
}
.section-title{
  font-size:clamp(1.9rem,3.4vw,2.7rem);
  font-weight:800; letter-spacing:-.01em; line-height:1.12;
  max-width:22ch;
}
.section-desc{
  color:var(--muted); font-size:1.02rem; max-width:42ch; line-height:1.7;
}

/* ==========================================================================
   Services
   ========================================================================== */
.services-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
  border-radius:var(--radius-md);
  overflow:hidden;
}
.service-card{
  background:var(--paper-2);
  padding:32px 26px;
  transition:background .25s ease;
}
.service-card:hover{background:var(--cream-1);}
.service-num{
  font-size:.85rem; font-weight:700; color:var(--muted);
  font-variant-numeric:tabular-nums;
}
.service-card h3{
  font-size:1.12rem; font-weight:700; margin-block:16px 10px; line-height:1.3;
}
.service-card p{color:var(--muted); font-size:.92rem; line-height:1.65;}

.types-row{
  margin-top:34px;
  display:flex; flex-wrap:wrap; gap:12px;
}
.type-chip{
  border:1px solid var(--line); background:var(--paper-2);
  padding:9px 18px; border-radius:999px;
  font-size:.86rem; font-weight:600; color:var(--ink-soft);
}

/* ==========================================================================
   Projects
   ========================================================================== */
.projects-grid{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:26px;
}
.project-card{
  position:relative;
  border-radius:var(--radius-md);
  overflow:hidden;
  background:#000;
  box-shadow:var(--shadow-card);
  cursor:pointer;
}
.project-card .ph{
  aspect-ratio:4/3.1; overflow:hidden;
}
.project-card img{
  width:100%; height:100%; object-fit:cover;
  transition:transform .6s cubic-bezier(.2,.7,.2,1);
}
.project-card:hover img{transform:scale(1.08);}
.project-card .overlay{
  position:absolute; inset:0;
  background:linear-gradient(180deg, rgba(20,24,31,0) 45%, rgba(20,24,31,.86) 100%);
}
.project-card .info{
  position:absolute; inset-inline:0; bottom:0;
  padding:18px 20px;
  color:#fff;
}
.project-card .info .loc{
  font-size:.74rem; letter-spacing:.06em; text-transform:uppercase;
  opacity:.75; margin-bottom:4px; font-weight:600;
}
.project-card .info .name{
  font-size:1.08rem; font-weight:700; line-height:1.3;
}
.project-card.tall{grid-row:span 2;}
.project-card.tall .ph{aspect-ratio:4/6.6; height:100%;}
.project-card.wide{grid-column:span 2;}
.project-card.wide .ph{aspect-ratio:8/3.6;}

.projects-more{
  text-align:center;
  margin-top:40px;
}

/* lightbox ------------------------------------------------------------- */
.lightbox{
  position:fixed; inset:0; z-index:1000;
  background:rgba(10,12,16,.92);
  display:flex; align-items:center; justify-content:center;
  padding:5vh 5vw;
  opacity:0; pointer-events:none;
  transition:opacity .25s ease;
}
.lightbox.open{opacity:1; pointer-events:auto;}
.lightbox img{max-height:88vh; max-width:100%; border-radius:12px; box-shadow:0 30px 80px rgba(0,0,0,.5);}
.lightbox .lb-cap{color:#fff; text-align:center; margin-top:16px; font-weight:600;}
.lightbox .lb-close{
  position:absolute; top:22px; inset-inline-end:26px;
  width:44px; height:44px; border-radius:50%;
  background:rgba(255,255,255,.12); color:#fff; border:none;
  font-size:1.4rem; cursor:pointer; line-height:1;
}
.lightbox .lb-close:hover{background:rgba(255,255,255,.22);}

/* ==========================================================================
   About
   ========================================================================== */
.about-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:clamp(30px,5vw,70px);
  align-items:center;
}
.about-text p{
  color:var(--ink-soft); line-height:1.85; font-size:1.03rem; margin-bottom:18px;
}
.about-stats{
  display:grid; grid-template-columns:1fr 1fr; gap:20px;
  margin-top:30px;
}
.about-stat{
  background:var(--paper-2); border:1px solid var(--line);
  border-radius:var(--radius-md); padding:22px 20px;
}
.about-stat .n{font-size:2.1rem; font-weight:800;}
.about-stat .l{color:var(--muted); font-size:.86rem; margin-top:4px;}

.about-mosaic{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
}
.about-mosaic img{
  border-radius:var(--radius-sm);
  aspect-ratio:1/1; object-fit:cover;
  box-shadow:var(--shadow-card);
}
.about-mosaic .m2{margin-top:28px;}
.about-mosaic .m3{margin-top:-28px;}

/* timeline ---------------------------------------------------------------*/
.timeline{
  margin-top:70px;
  border-top:1px solid var(--line);
}
.tl-row{
  display:grid;
  grid-template-columns:160px 1fr 2fr;
  gap:24px;
  padding-block:24px;
  border-bottom:1px solid var(--line);
  align-items:start;
}
.tl-row .years{font-weight:800; font-size:1.05rem; color:var(--accent);}
.tl-row h4{font-size:1.05rem; font-weight:700; margin-bottom:6px;}
.tl-row p{color:var(--muted); font-size:.92rem; line-height:1.6;}

/* ==========================================================================
   Why us
   ========================================================================== */
.why-grid{
  display:grid; grid-template-columns:repeat(4,1fr); gap:22px;
}
.why-card{
  background:linear-gradient(160deg, var(--cream-1), var(--paper-2) 60%);
  border:1px solid var(--line);
  border-radius:var(--radius-md);
  padding:28px 24px;
}
.why-card .ic{
  width:46px; height:46px; border-radius:12px;
  background:var(--ink); color:#fff;
  display:flex; align-items:center; justify-content:center;
  margin-bottom:18px;
}
.why-card h4{font-size:1.05rem; font-weight:700; margin-bottom:8px;}
.why-card p{color:var(--muted); font-size:.9rem; line-height:1.6;}

/* ==========================================================================
   Contact
   ========================================================================== */
.contact-grid{
  display:grid; grid-template-columns:1fr 1fr; gap:clamp(30px,5vw,60px);
}
.contact-card{
  background:var(--ink); color:#fff;
  border-radius:var(--radius-lg);
  padding:clamp(28px,4vw,48px);
}
.contact-card h3{font-size:1.5rem; font-weight:800; margin-bottom:22px;}
.contact-row{
  display:flex; align-items:flex-start; gap:14px;
  padding-block:14px; border-top:1px solid rgba(255,255,255,.14);
}
.contact-row:first-of-type{border-top:none;}
.contact-row .ic{
  width:38px;height:38px;border-radius:10px;background:rgba(255,255,255,.1);
  display:flex;align-items:center;justify-content:center; flex:none;
}
.contact-row a, .contact-row span{color:#fff; opacity:.92; font-weight:500;}
.contact-row .lbl{display:block; font-size:.76rem; opacity:.55; margin-bottom:2px;}
.map-frame{
  border-radius:var(--radius-lg);
  overflow:hidden; border:1px solid var(--line);
  min-height:340px;
  box-shadow:var(--shadow-card);
}
.map-frame iframe{width:100%; height:100%; min-height:340px; border:0; display:block;}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer{
  border-top:1px solid var(--line);
  padding-block:36px;
}
.site-footer .wrap{
  display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:14px;
}
.foot-name{font-weight:700;}
.foot-sub{color:var(--muted); font-size:.84rem; margin-top:2px;}
.foot-links{display:flex; gap:22px; flex-wrap:wrap;}
.foot-links a{color:var(--muted); font-size:.88rem;}
.foot-links a:hover{color:var(--ink);}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 980px){
  .main-nav{display:none;}
  .nav-toggle{display:flex;}
  .header-actions .lang-toggle{display:none;}
  .header-actions .btn{display:none;}
  .topbar-contacts{gap:12px;}
  .topbar-contacts a{font-size:.72rem;}
  .hero-grid{grid-template-columns:1fr;}
  .hero-visual{aspect-ratio:16/11; order:-1;}
  .services-grid{grid-template-columns:repeat(2,1fr);}
  .about-grid{grid-template-columns:1fr;}
  .about-mosaic{order:-1;}
  .why-grid{grid-template-columns:repeat(2,1fr);}
  .contact-grid{grid-template-columns:1fr;}
  .tl-row{grid-template-columns:1fr; gap:6px;}
  .projects-grid{grid-template-columns:repeat(2,1fr);}
  .project-card.wide{grid-column:span 2;}
  .project-card.tall{grid-row:span 1;}
  .project-card.tall .ph{aspect-ratio:4/3.1; height:auto;}
}

@media (max-width: 620px){
  .topbar .wrap{font-size:.72rem; justify-content:center; text-align:center;}
  .topbar-license{display:none;}
  .services-grid{grid-template-columns:1fr;}
  .why-grid{grid-template-columns:1fr;}
  .projects-grid{grid-template-columns:1fr;}
  .project-card.wide{grid-column:span 1;}
  .about-stats{grid-template-columns:1fr 1fr;}
  .hero-ctas{flex-direction:column; align-items:stretch;}
  .hero-ctas .btn{justify-content:center;}
  .section-head{flex-direction:column; align-items:flex-start;}
}

/* mobile nav drawer --------------------------------------------------------*/
.mobile-nav{
  position:fixed; inset:0; z-index:200;
  background:var(--paper);
  display:flex; flex-direction:column;
  padding:24px var(--pad-inline);
  transform:translateY(-100%);
  transition:transform .35s ease;
}
.mobile-nav.open{transform:translateY(0);}
.mobile-nav-top{display:flex; justify-content:space-between; align-items:center; margin-bottom:32px;}
.mobile-nav .lang-toggle{margin-bottom:28px; align-self:flex-start;}
.mobile-nav a{
  font-size:1.6rem; font-weight:700; padding-block:14px;
  border-bottom:1px solid var(--line);
}
.mobile-nav .btn{margin-top:24px; justify-content:center;}