/* =========================================================
   Offset Prestressing — shared stylesheet
   Industrial / structural-engineering aesthetic
   Space Grotesk + IBM Plex Mono · black / paper / red
   ========================================================= */

:root{
  --black:#0A0908;
  --black-2:#131210;
  --black-3:#1C1A16;
  --paper:#F3F2ED;
  --paper-2:#E9E7DC;
  --ink:#141310;
  --ink-soft:#454336;
  --red:#E31E24;
  --red-dark:#A8121A;
  --red-glow:rgba(227,30,36,0.28);
  --line-dark:rgba(255,255,255,0.14);
  --line-dark-soft:rgba(255,255,255,0.07);
  --line:#D9D6C8;
  --line-strong:#B8B5A3;
  --steel:#948F7C;
  --steel-dark:#9C998A;
  --white:#FDFCF9;
  --wa:#25D366;
  --wa-dark:#1da851;
  --font-display:'Space Grotesk', sans-serif;
  --font-mono:'IBM Plex Mono', monospace;
}
*{box-sizing:border-box; margin:0; padding:0;}
html{scroll-behavior:smooth;}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-display);
  font-weight:400;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{display:block; max-width:100%;}
a{color:inherit;}
.wrap{max-width:1180px; margin:0 auto; padding:0 30px;}
::selection{ background:var(--red); color:var(--white); }

.tag{ font-family:var(--font-mono); font-size:12.5px; letter-spacing:0.02em; color:var(--steel); }
.tag.on-dark{ color:#9E9C8E; }

/* ---------- header ---------- */
header{
  position:sticky; top:0; z-index:100;
  background:rgba(10,9,8,0.82);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line-dark);
}
.nav{ display:flex; align-items:center; justify-content:space-between; height:76px; }
.brand{ display:flex; align-items:center; gap:11px; font-weight:700; font-size:20px; letter-spacing:0.01em; text-decoration:none; color:var(--white); }
.brand .mark{ width:27px; height:27px; border-radius:50%; border:5px solid var(--red); position:relative; flex-shrink:0; box-shadow:0 0 14px var(--red-glow); }
.brand .mark::after{ content:""; position:absolute; inset:0; margin:auto; width:8px; height:8px; border-radius:50%; background:var(--white); }
nav.links{ display:flex; gap:34px; font-family:var(--font-mono); font-size:13.5px; align-items:center; }
nav.links a{ text-decoration:none; color:#C7C4B5; position:relative; padding-bottom:4px; transition:color .2s; }
nav.links a::after{ content:""; position:absolute; left:0; right:100%; bottom:0; height:1px; background:var(--red); transition:right .25s ease; }
nav.links a:hover{ color:var(--white); }
nav.links a:hover::after{ right:0; }
nav.links a.active{ color:var(--white); }
nav.links a.active::after{ right:0; }
.nav-cta{ font-family:var(--font-mono); font-size:13px; border:1px solid var(--wa); background:var(--wa); padding:9px 16px; text-decoration:none; color:#07350f; white-space:nowrap; transition:all .2s; display:inline-flex; align-items:center; gap:8px; font-weight:500; }
.nav-cta:hover{ background:var(--wa-dark); border-color:var(--wa-dark); color:#fff; }
.nav-cta svg{ width:15px; height:15px; }
.menu-btn{ display:none; background:none; border:1px solid var(--line-dark); color:var(--white); padding:9px 12px; font-family:var(--font-mono); font-size:12px; cursor:pointer; }

/* ---------- hero (home) ---------- */
.hero{ position:relative; background:var(--black); color:var(--white); padding:104px 0 0; overflow:hidden; }
.hero::before{
  content:""; position:absolute; inset:0;
  background-image:
    linear-gradient(var(--line-dark-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-dark-soft) 1px, transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse 80% 60% at 30% 20%, black 40%, transparent 100%);
  pointer-events:none;
}
.hero::after{
  content:""; position:absolute; top:-200px; left:-100px; width:700px; height:700px; border-radius:50%;
  background:radial-gradient(circle, var(--red-glow) 0%, transparent 68%); pointer-events:none;
}
.hero-inner{ position:relative; z-index:2; }
.hero-grid{ display:grid; grid-template-columns:1.08fr 0.92fr; gap:50px; align-items:center; padding-bottom:60px; }

.reveal{ opacity:0; transform:translateY(16px); animation:rise .8s cubic-bezier(.2,.7,.2,1) forwards; }
.reveal.d1{ animation-delay:.05s; }
.reveal.d2{ animation-delay:.16s; }
.reveal.d3{ animation-delay:.28s; }
.reveal.d4{ animation-delay:.4s; }
@keyframes rise{ to{ opacity:1; transform:translateY(0); } }
@media (prefers-reduced-motion: reduce){ .reveal{ animation:none; opacity:1; transform:none; } }

.eyebrow{ font-family:var(--font-mono); font-size:13px; color:var(--red); margin-bottom:20px; display:flex; align-items:center; gap:10px; }
.eyebrow .dot{ width:6px; height:6px; border-radius:50%; background:var(--red); box-shadow:0 0 8px var(--red); }
h1.headline{ font-size:clamp(40px,5.6vw,68px); font-weight:700; line-height:1.0; letter-spacing:-0.025em; max-width:11.5ch; }
h1.headline .line2{ display:block; color:#8E8B7B; font-weight:300; font-size:0.56em; margin-top:14px; letter-spacing:0; }
.hero-sub{ margin-top:24px; font-size:17.5px; color:#B7B4A5; max-width:48ch; line-height:1.6; }
.hero-cta{ display:flex; gap:14px; margin-top:36px; flex-wrap:wrap; }
.btn{ font-family:var(--font-mono); font-size:13.5px; text-decoration:none; padding:14px 24px; display:inline-block; border:1px solid var(--white); transition:all .2s; }
.btn-solid{ background:var(--red); border-color:var(--red); color:var(--white); }
.btn-solid:hover{ background:var(--red-dark); border-color:var(--red-dark); transform:translateY(-1px); }
.btn-ghost-dark{ color:var(--white); }
.btn-ghost-dark:hover{ background:var(--white); color:var(--black); }
.btn-ghost{ color:var(--ink); border-color:var(--ink); }
.btn-ghost:hover{ background:var(--ink); color:var(--white); }
.btn-wa{ background:var(--wa); border-color:var(--wa); color:#07350f; display:inline-flex; align-items:center; gap:9px; font-weight:500; }
.btn-wa:hover{ background:var(--wa-dark); border-color:var(--wa-dark); color:#fff; transform:translateY(-1px); }
.btn-wa svg{ width:16px; height:16px; }

.diagram-box{ border:1px solid var(--line-dark); background:linear-gradient(180deg, var(--black-2), var(--black-3)); padding:20px 20px 14px; box-shadow:0 30px 70px -20px rgba(0,0,0,0.6); }
.diagram-box .cap{ display:flex; justify-content:space-between; font-family:var(--font-mono); font-size:11px; color:#8A876F; margin-top:12px; padding-top:12px; border-top:1px dashed var(--line-dark); }

/* stat ticker */
.ticker-band{ position:relative; z-index:2; border-top:1px solid var(--line-dark); border-bottom:1px solid var(--line-dark); background:var(--black-2); overflow:hidden; }
.ticker-track{ display:flex; width:max-content; animation:scroll 28s linear infinite; }
.ticker-track:hover{ animation-play-state:paused; }
@keyframes scroll{ from{ transform:translateX(0); } to{ transform:translateX(-50%); } }
.tick{ display:flex; align-items:center; gap:14px; padding:20px 40px; white-space:nowrap; border-right:1px solid var(--line-dark); }
.tick .num{ font-size:22px; font-weight:600; color:var(--white); }
.tick .lbl{ font-family:var(--font-mono); font-size:11.5px; color:#8A876F; }
@media (prefers-reduced-motion: reduce){ .ticker-track{ animation:none; } }

/* ---------- page hero (sub-pages) ---------- */
.page-hero{ position:relative; background:var(--black); color:var(--white); padding:70px 0 60px; overflow:hidden; }
.page-hero::before{
  content:""; position:absolute; inset:0;
  background-image:
    linear-gradient(var(--line-dark-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-dark-soft) 1px, transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse 70% 80% at 20% 30%, black 30%, transparent 100%);
  pointer-events:none;
}
.page-hero .wrap{ position:relative; z-index:2; }
.page-hero .crumb{ font-family:var(--font-mono); font-size:12.5px; color:var(--steel); margin-bottom:16px; }
.page-hero .crumb a{ text-decoration:none; color:var(--steel); }
.page-hero .crumb a:hover{ color:var(--red); }
.page-hero h1{ font-size:clamp(32px,4.6vw,52px); font-weight:700; letter-spacing:-0.025em; line-height:1.02; max-width:16ch; }
.page-hero p{ margin-top:20px; font-size:16.5px; color:#B7B4A5; max-width:60ch; line-height:1.6; }

/* ---------- section shell ---------- */
section{ padding:100px 0; }
section.dark{ background:var(--black); color:var(--white); }
section.alt{ background:var(--paper-2); }
.sec-head{ display:grid; grid-template-columns:300px 1fr; gap:44px; margin-bottom:52px; }
.sec-head .tag{ margin-bottom:12px; }
h2.sec-title{ font-size:clamp(28px,3.2vw,38px); font-weight:700; letter-spacing:-0.02em; line-height:1.1; }
.sec-head p{ color:var(--ink-soft); max-width:56ch; padding-top:6px; font-size:15.5px; }
section.dark .sec-head p{ color:#B0AD9E; }

.sec-more{ margin-top:44px; }
.link-arrow{ font-family:var(--font-mono); font-size:13.5px; text-decoration:none; color:var(--red); border-bottom:1px solid transparent; padding-bottom:3px; transition:border-color .2s; }
.link-arrow:hover{ border-color:var(--red); }
section.dark .link-arrow{ color:#ff5a5f; }

/* ---------- about ---------- */
.pt-explain{ display:grid; grid-template-columns:1fr 1fr; gap:60px; }
.pt-explain p{ color:var(--ink-soft); margin-bottom:16px; font-size:15.5px; }
.adv-list{ list-style:none; }
.adv-list li{ display:flex; gap:16px; align-items:flex-start; padding:16px 0; border-top:1px solid var(--line); font-size:15.5px; transition:padding-left .2s; }
.adv-list li:hover{ padding-left:6px; }
.adv-list li:last-child{ border-bottom:1px solid var(--line); }
.adv-list li .mk{ width:9px; height:9px; margin-top:6px; background:var(--red); flex-shrink:0; transform:rotate(45deg); }

.components{ margin-top:24px; display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:1px solid var(--line); }
.comp-item{ background:var(--paper); padding:18px 20px; transition:background .2s; }
.comp-item:hover{ background:var(--white); }
.comp-item .k{ font-family:var(--font-mono); font-size:11px; color:var(--red); letter-spacing:.03em; }
.comp-item .v{ font-size:13.5px; margin-top:6px; color:var(--ink-soft); line-height:1.5; }

/* ---------- services ---------- */
.services-list{ list-style:none; }
.services-list li{ display:grid; grid-template-columns:230px 1fr; gap:26px; padding:26px 0; border-bottom:1px solid var(--line-dark); position:relative; }
.services-list li:first-child{ border-top:1px solid var(--line-dark); }
.services-list li::before{ content:""; position:absolute; left:-30px; top:0; bottom:0; width:3px; background:var(--red); transform:scaleY(0); transform-origin:top; transition:transform .25s; }
.services-list li:hover::before{ transform:scaleY(1); }
.services-list .s-title{ font-weight:600; font-size:17px; color:var(--white); }
.services-list .s-desc{ color:#AFAC9D; font-size:14.5px; max-width:62ch; }
/* light variant for services page on paper bg */
.services-list.on-light li{ border-color:var(--line); }
.services-list.on-light li:first-child{ border-top:1px solid var(--line); }
.services-list.on-light .s-title{ color:var(--ink); }
.services-list.on-light .s-desc{ color:var(--ink-soft); }

/* ---------- featured projects ---------- */
.feat-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line-strong); border:1px solid var(--line-strong); margin-bottom:60px; }
.feat-card{ background:var(--paper); padding:30px 26px; transition:background .2s; }
.feat-card:hover{ background:var(--white); }
.feat-card .big{ font-size:34px; font-weight:700; letter-spacing:-0.02em; color:var(--red); }
.feat-card .lbl{ font-family:var(--font-mono); font-size:11px; color:var(--steel); margin-top:6px; }
.feat-card .name{ margin-top:18px; font-weight:600; font-size:15px; }
.feat-card .loc{ font-size:13px; color:var(--ink-soft); margin-top:4px; }

.table-scroll{ overflow-x:auto; border:1px solid var(--line-strong); }
table{ width:100%; border-collapse:collapse; min-width:960px; }
thead th{ text-align:left; font-family:var(--font-mono); font-weight:500; font-size:11.5px; color:var(--steel); padding:15px 16px; border-bottom:1px solid var(--line-strong); background:var(--paper-2); white-space:nowrap; }
tbody td{ padding:15px 16px; border-bottom:1px solid var(--line); font-size:14px; vertical-align:top; }
tbody tr{ transition:background .15s; }
tbody tr:hover{ background:var(--white); }
tbody tr:last-child td{ border-bottom:none; }
tbody td.num{ font-family:var(--font-mono); font-size:13px; color:var(--ink-soft); }
.status{ font-family:var(--font-mono); font-size:11.5px; padding:4px 9px; display:inline-block; border:1px solid var(--line-strong); white-space:nowrap; }
.status.done{ color:var(--steel); }
.status.ongoing{ color:var(--red); border-color:var(--red); background:rgba(227,30,36,0.06); }

/* ---------- team/equipment ---------- */
.split{ display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--line-dark); border:1px solid var(--line-dark); }
.split-col{ background:var(--black-2); padding:36px 32px; }
.split-col h3{ font-size:18px; font-weight:600; margin-bottom:20px; color:var(--white); }
.split-col ul{ list-style:none; }
.split-col li{ display:flex; justify-content:space-between; gap:12px; padding:12px 0; border-top:1px solid var(--line-dark); font-size:14.5px; color:#C9C6B7; }
.split-col li:last-child{ border-bottom:1px solid var(--line-dark); }
.split-col li .amt{ font-family:var(--font-mono); color:var(--red); flex-shrink:0; }

/* ---------- why choose ---------- */
.why-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:0; border-top:1px solid var(--line-strong); border-left:1px solid var(--line-strong); }
.why-item{ border-right:1px solid var(--line-strong); border-bottom:1px solid var(--line-strong); padding:34px 30px; transition:box-shadow .2s, background .2s; position:relative; }
.why-item:hover{ background:var(--white); box-shadow:inset 3px 0 0 var(--red); }
.why-item .idx{ font-family:var(--font-mono); font-size:12px; color:var(--red); margin-bottom:12px; letter-spacing:.03em; }
.why-item p{ font-size:15px; color:var(--ink-soft); line-height:1.55; }

.creds{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:1px solid var(--line); }
.cred{ background:var(--paper); padding:20px 22px; }
.cred .k{ font-family:var(--font-mono); font-size:11px; color:var(--steel); }
.cred .v{ font-size:14px; margin-top:6px; word-break:break-word; }

/* ---------- contact ---------- */
.contact-grid{ display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:start; }
.contact-line{ display:flex; gap:18px; padding:17px 0; border-top:1px solid var(--line-dark); }
.contact-line:last-child{ border-bottom:1px solid var(--line-dark); }
.contact-line .k{ font-family:var(--font-mono); font-size:11.5px; color:#8A876F; width:90px; flex-shrink:0; padding-top:2px; }
.contact-line .v{ color:#DEDBCC; }
.contact-line .v a{ text-decoration:none; }
.contact-line .v a:hover{ color:var(--red); }
.contact-panel{ background:linear-gradient(160deg, var(--red-dark), var(--red)); color:var(--white); padding:40px 34px; box-shadow:0 30px 70px -25px rgba(227,30,36,0.4); }
.contact-panel .tag{ color:rgba(255,255,255,0.75); }
.contact-panel h3{ font-size:24px; font-weight:700; margin:12px 0 18px; letter-spacing:-0.01em; }
.contact-panel p{ color:rgba(255,255,255,0.88); font-size:14.5px; margin-bottom:26px; }
.contact-panel .btn{ border-color:var(--white); }
.contact-panel .btn.wa-panel{ background:var(--white); color:var(--red-dark); display:inline-flex; align-items:center; gap:9px; }
.contact-panel .btn.wa-panel:hover{ background:var(--black); color:var(--white); }
.contact-panel .btn.wa-panel svg{ width:16px; height:16px; }

.orbit-panel{ background:var(--black-2); border:1px solid var(--line-dark); padding:34px 30px; }
.orbit-panel h3{ font-size:21px; font-weight:700; margin:12px 0 14px; color:var(--white); letter-spacing:-0.01em; }
.orbit-panel p{ color:#B0AD9E; font-size:14.5px; margin-bottom:22px; line-height:1.55; }

.map-embed{ margin-top:30px; border:1px solid var(--line-dark); }
.map-embed iframe{ display:block; width:100%; height:320px; border:0; filter:grayscale(0.2) contrast(1.05); }

footer{ border-top:1px solid var(--line-dark); padding:44px 0 30px; background:var(--black); color:#8A876F; }
.foot-top{ display:grid; grid-template-columns:1.4fr 1fr 1fr; gap:40px; margin-bottom:36px; }
.foot-brand{ display:flex; align-items:center; gap:11px; font-weight:700; font-size:19px; color:var(--white); text-decoration:none; margin-bottom:16px; }
.foot-brand .mark{ width:24px; height:24px; border-radius:50%; border:4px solid var(--red); position:relative; box-shadow:0 0 14px var(--red-glow); }
.foot-brand .mark::after{ content:""; position:absolute; inset:0; margin:auto; width:7px; height:7px; border-radius:50%; background:var(--white); }
.foot-col h4{ font-family:var(--font-mono); font-size:11.5px; color:var(--steel); font-weight:500; margin-bottom:16px; letter-spacing:.03em; }
.foot-col a, .foot-col p{ display:block; text-decoration:none; color:#C9C6B7; font-size:14px; margin-bottom:10px; transition:color .2s; }
.foot-col a:hover{ color:var(--red); }
.foot-note{ font-size:14px; color:#8A876F; line-height:1.6; max-width:40ch; }
.foot-row{ display:flex; justify-content:space-between; align-items:center; font-family:var(--font-mono); font-size:12px; color:#8A876F; flex-wrap:wrap; gap:10px; border-top:1px solid var(--line-dark); padding-top:24px; }

/* ---------- floating WhatsApp button ---------- */
.wa-float{
  position:fixed; right:22px; bottom:22px; z-index:200;
  width:58px; height:58px; border-radius:50%;
  background:var(--wa); color:#fff;
  display:flex; align-items:center; justify-content:center;
  box-shadow:0 10px 30px -6px rgba(37,211,102,0.55), 0 4px 12px rgba(0,0,0,0.3);
  text-decoration:none; transition:transform .2s, box-shadow .2s;
}
.wa-float:hover{ transform:translateY(-3px) scale(1.05); box-shadow:0 16px 38px -6px rgba(37,211,102,0.65); }
.wa-float svg{ width:30px; height:30px; }
.wa-float .pulse{ position:absolute; inset:0; border-radius:50%; background:var(--wa); opacity:.45; animation:wapulse 2.4s ease-out infinite; z-index:-1; }
@keyframes wapulse{ 0%{ transform:scale(1); opacity:.45; } 100%{ transform:scale(1.9); opacity:0; } }
@media (prefers-reduced-motion: reduce){ .wa-float .pulse{ animation:none; display:none; } }

/* ---------- responsive ---------- */
@media (max-width: 860px){
  nav.links{
    display:none; flex-direction:column; align-items:flex-start;
    position:absolute; top:76px; left:0; right:0;
    background:#131210; border-bottom:1px solid var(--line-dark);
    padding:22px 30px; gap:20px;
  }
  nav.links.open{ display:flex; }
  nav.links .nav-cta{ width:100%; justify-content:center; }
  .menu-btn{ display:block; }
  .hero-grid{ grid-template-columns:1fr; }
  .sec-head{ grid-template-columns:1fr; gap:12px; }
  .pt-explain{ grid-template-columns:1fr; gap:34px; }
  .components{ grid-template-columns:1fr; }
  .services-list li{ grid-template-columns:1fr; gap:8px; }
  .services-list li::before{ display:none; }
  .feat-grid{ grid-template-columns:1fr; }
  .split{ grid-template-columns:1fr; }
  .why-grid{ grid-template-columns:1fr; }
  .creds{ grid-template-columns:1fr; }
  .contact-grid{ grid-template-columns:1fr; gap:38px; }
  .foot-top{ grid-template-columns:1fr; gap:30px; }
  section{ padding:72px 0; }
}