/* ================= Aerveda Engineers — Landing Page =================
   Blueprint-drafting aesthetic: navy ground, teal-green gradient (from logo),
   amber hazard accent, technical mono for specs/standards.
   ======================================================================= */

:root{
  --navy:#0B2A3D;
  --navy-2:#0F3549;
  --paper:#F7F9F8;
  --paper-dim:#EDF1EF;
  --ink:#0B2A3D;
  --ink-soft:#4A5D66;
  --teal:#0EA5A0;
  --green:#7CB93D;
  --amber:#E8871E;
  --line:#D8E0DE;
  --line-dark:#1E4A5C;
  --grad: linear-gradient(120deg, #0EA5A0 0%, #4FB86B 55%, #7CB93D 100%);
  --radius:2px;
  --maxw:1180px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:'Space Grotesk',system-ui,sans-serif;
  color:var(--navy);
  line-height:1.15;
  margin:0 0 .5em;
  letter-spacing:-0.01em;
}
h1{font-size:clamp(2rem,4.2vw,3.2rem); font-weight:600}
h2{font-size:clamp(1.5rem,3vw,2.15rem); font-weight:600}
h3{font-size:1.2rem; font-weight:600}
p{margin:0 0 1em; color:var(--ink-soft)}
a{color:var(--teal); text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%; display:block}
.mono{font-family:'IBM Plex Mono',monospace}
.wrap{max-width:var(--maxw); margin:0 auto; padding:0 24px}
.eyebrow{
  font-family:'IBM Plex Mono',monospace;
  text-transform:uppercase;
  letter-spacing:.12em;
  font-size:.72rem;
  color:var(--teal);
  font-weight:600;
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-bottom:14px;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--teal)}

.skip-link{position:absolute;left:-999px;top:0;background:var(--navy);color:#fff;padding:10px 16px;z-index:999}
.skip-link:focus{left:8px;top:8px}

/* ---------- Header ---------- */
header.site{
  position:sticky; top:0; z-index:100;
  background:rgba(247,249,248,.94);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav-row{display:flex; align-items:center; justify-content:space-between; height:72px; gap:20px}
.brand{display:flex; align-items:center; gap:10px; font-family:'Space Grotesk'; font-weight:700; font-size:1.1rem; color:var(--navy)}
.brand svg{height:32px; width:32px; flex:none}
.brand small{display:block; font-family:'IBM Plex Mono'; font-weight:400; font-size:.58rem; letter-spacing:.1em; color:var(--ink-soft); text-transform:uppercase}
nav.main{display:flex; gap:4px; align-items:center}
nav.main a{color:var(--ink); font-size:.87rem; font-weight:500; padding:9px 12px; border-radius:var(--radius); white-space:nowrap}
nav.main a:hover{color:var(--teal); text-decoration:none}
.cta-btn{
  background:var(--navy); color:#fff !important; padding:10px 18px; border-radius:var(--radius);
  font-size:.85rem; font-weight:600; white-space:nowrap;
}
.cta-btn:hover{background:var(--line-dark); text-decoration:none}
.menu-toggle{display:none; background:none; border:1px solid var(--line); padding:8px 10px; border-radius:var(--radius); cursor:pointer; font-size:1.1rem}

/* ---------- Hero ---------- */
.hero{position:relative; overflow:hidden; padding:110px 0 76px; color:#fff}
.hero::before{
  content:""; position:absolute; inset:0; z-index:0;
  background-image:
    linear-gradient(180deg, rgba(6,20,30,.88) 0%, rgba(9,32,46,.90) 45%, rgba(11,42,61,.97) 100%),
    url('img/hero-rooftop.jpg');
  background-size:cover; background-position:center 62%;
}
.hero-grid{
  position:absolute; inset:0; z-index:1; opacity:.14;
  background-image:linear-gradient(rgba(255,255,255,.5) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.5) 1px, transparent 1px);
  background-size:34px 34px;
}
.hero .wrap{position:relative; z-index:2}
.hero-inner{max-width:62ch}
.hero h1{color:#fff}
.hero p.lead{color:#D6E4E6; font-size:1.08rem; max-width:52ch}
.hero .actions{display:flex; gap:14px; margin-top:26px; flex-wrap:wrap}
.btn{
  display:inline-flex; align-items:center; gap:8px; padding:13px 22px; border-radius:var(--radius);
  font-weight:600; font-size:.92rem; border:1px solid transparent; cursor:pointer;
}
.btn-primary{background:var(--grad); color:#04211f}
.btn-primary:hover{filter:brightness(1.08); text-decoration:none}
.btn-ghost{border-color:rgba(255,255,255,.4); color:#fff}
.btn-ghost:hover{border-color:#fff; text-decoration:none}
.stat-row{display:flex; gap:44px; margin-top:44px; border-top:1px solid rgba(255,255,255,.18); padding-top:26px; flex-wrap:nowrap; overflow-x:auto}
.stat{flex:none}
.stat b{display:block; font-family:'Space Grotesk'; font-size:1.5rem; color:#fff}
.stat span{font-family:'IBM Plex Mono'; font-size:.68rem; text-transform:uppercase; letter-spacing:.07em; color:#9FC3C7}

/* ---------- Sections ---------- */
section{padding:70px 0}
section.tight{padding:46px 0}
.section-head{max-width:100%; margin-bottom:36px}
.section-head.center{margin-left:auto; margin-right:auto; text-align:center}
.bg-dim{background:var(--paper-dim)}
.bg-navy{background:var(--navy); color:#fff}
.bg-navy h2, .bg-navy h3{color:#fff}
.bg-navy p{color:#C9D8DB}

/* ---------- Industry expertise — index rows ---------- */
.expertise-list{border-top:1px solid var(--line)}
.expertise-row{
  display:grid; grid-template-columns:300px 1fr; gap:36px; align-items:center;
  padding:26px 18px; border-bottom:1px solid var(--line);
  transition:background .18s ease, padding-left .18s ease, border-color .18s ease;
}
.expertise-row:hover{background:linear-gradient(90deg, rgba(14,165,160,.07), transparent 70%); padding-left:30px}
.expertise-row-left{display:flex; align-items:center; gap:16px}
.expertise-row-left h3{margin:0; font-size:1.15rem}
.expertise-row .idx{font-family:'IBM Plex Mono'; font-size:.8rem; color:var(--teal); flex:none; width:26px}
.expertise-row p{margin:0; font-size:.94rem}
.expertise-row .icon-chip{margin:0; flex:none}

/* ---------- Grids / Cards ---------- */
.grid{display:grid; gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-5{grid-template-columns:repeat(5,1fr)}
.card{
  background:#fff; border:1px solid var(--line); border-radius:var(--radius); padding:24px;
  transition:transform .15s ease, box-shadow .15s ease;
}
.card:hover{transform:translateY(-3px); box-shadow:0 14px 30px rgba(11,42,61,.08)}
.card .num{font-family:'IBM Plex Mono'; color:var(--teal); font-size:.76rem; margin-bottom:10px; display:block}
.card h3{margin-bottom:8px; font-size:1.05rem}
.card p{margin-bottom:0; font-size:.92rem}
.icon-chip{
  width:40px; height:40px; border-radius:var(--radius); background:var(--grad); display:flex; align-items:center; justify-content:center;
  margin-bottom:14px; color:#04211f; font-family:'Space Grotesk'; font-weight:700; font-size:.85rem;
}

/* ---------- Services detail cards ---------- */
.svc-card{background:#fff; border:1px solid var(--line); border-radius:var(--radius); padding:28px}
.svc-card h3{color:var(--navy); font-size:1.1rem; margin-bottom:4px}
.svc-card .num{font-family:'IBM Plex Mono'; color:var(--teal); font-size:.74rem; text-transform:uppercase; letter-spacing:.06em}
.svc-card ul{list-style:none; margin:14px 0 0; padding:0}
.svc-card ul li{position:relative; padding-left:20px; margin-bottom:9px; font-size:.9rem; color:var(--ink-soft)}
.svc-card ul li::before{content:"—"; position:absolute; left:0; color:var(--teal); font-weight:700}

/* ---------- Pills / checklist ---------- */
.pill{
  display:inline-block; padding:8px 12px; border:1px solid var(--line); border-radius:20px; font-size:.80rem;
  color:var(--ink-soft); margin:4px 6px 4px 0; font-family:'IBM Plex Mono';
}
.pill.on-navy{border-color:#2A5A67; color:#C9D8DB}
.list-check{list-style:none; padding:0; margin:0}
.list-check li{position:relative; padding-left:26px; margin-bottom:12px; color:var(--ink-soft); font-size:.95rem}
.list-check li::before{content:"—"; position:absolute; left:0; color:var(--teal); font-weight:700}

/* ---------- Two column feature ---------- */
.feature{display:grid; grid-template-columns:1fr 1fr; gap:52px; align-items:center}
.sub-label{
  display:block; font-family:'IBM Plex Mono'; font-size:.74rem; text-transform:uppercase;
  letter-spacing:.08em; color:var(--green); margin-bottom:18px;
}

/* ---------- Consultancy capability tiles ---------- */
.consult-grid{display:grid; grid-template-columns:repeat(1,1fr); gap:12px}
.consult-tile{
  display:flex; align-items:center; gap:13px; padding:15px 16px;
  border:1px solid rgba(255,255,255,.14); border-radius:var(--radius);
  background:rgba(255,255,255,.03); color:#E8F1F2; font-size:.87rem; line-height:1.3;
  transition:border-color .15s ease, background .15s ease, transform .15s ease;
}
.consult-tile:hover{border-color:var(--teal); background:rgba(255,255,255,.07); transform:translateY(-2px)}
.ct-ico{
  width:36px; height:36px; border-radius:var(--radius); background:var(--grad); flex:none;
  display:flex; align-items:center; justify-content:center; color:#04211f; font-weight:700;
  font-size:.66rem; font-family:'IBM Plex Mono';
}

/* ---------- Mini stat row (inside dark cards) ---------- */
.stat-mini-row{display:flex; flex-wrap:wrap; gap:18px; border-bottom:1px solid rgba(255,255,255,.14); padding-bottom:22px}
.stat-mini-row > div{flex:1; min-width:100px}
.stat-mini-row b{display:block; font-family:'Space Grotesk'; font-size:1.5rem; color:#fff; font-weight:700}
.stat-mini-row span{font-family:'IBM Plex Mono'; font-size:.64rem; text-transform:uppercase; letter-spacing:.05em; color:#9FC3C7}
.tool-strip{margin-top:20px; padding-top:18px; border-top:1px solid rgba(255,255,255,.12)}

/* ---------- Process steps ---------- */
.steps{display:grid; grid-template-columns:repeat(4,1fr); gap:22px}
.step{padding:20px 18px 0; border-top:2px solid var(--line); position:relative}
.step .n{font-family:'IBM Plex Mono'; color:var(--teal); font-size:.78rem; display:block; margin-bottom:8px}
.step::before{content:""; position:absolute; top:-2px; left:0; width:32px; height:2px; background:var(--grad)}
.step p{font-size:.87rem; margin-bottom:0}
.step h4{font-size:.94rem; margin:0 0 6px; color:var(--navy); font-family:'Space Grotesk'}

/* ---------- Diagram box ---------- */
.diagram-box{background:var(--navy); border-radius:var(--radius); padding:32px; color:#fff}
.standards-list{list-style:none; margin:14px 0 0; padding:0}
.standards-list li{
  display:flex; align-items:center; gap:14px; padding:17px 4px;
  border-bottom:1px solid rgba(255,255,255,.1); font-size:.94rem; color:#E3EEF0;
}
.standards-list li:last-child{border-bottom:none}
.standards-list li:hover{color:#fff}
.std-ico{
  width:24px; height:24px; border-radius:50%; background:var(--grad); flex:none;
  display:flex; align-items:center; justify-content:center;
  color:#04211f; font-weight:700; font-size:.72rem; line-height:1;
}

/* ---------- Gallery ---------- */
.gallery{display:grid; grid-template-columns:repeat(3,1fr); gap:14px}
.gallery figure{margin:0; position:relative; overflow:hidden; border-radius:var(--radius); aspect-ratio:4/3}
.gallery img{width:100%; height:100%; object-fit:cover; transition:transform .4s ease}
.gallery figure:hover img{transform:scale(1.06)}
.gallery figcaption{
  position:absolute; left:0; right:0; bottom:0; padding:10px 12px 8px;
  background:linear-gradient(0deg, rgba(6,20,30,.86), transparent);
  color:#fff; font-family:'IBM Plex Mono'; font-size:.68rem; letter-spacing:.03em; text-transform:uppercase;
}

/* ---------- Portfolio filter tabs ---------- */
.filter-tabs{display:flex; gap:10px; flex-wrap:wrap; margin:28px 0 32px}
.filter-tab{
  font-family:'IBM Plex Mono'; font-size:.76rem; text-transform:uppercase; letter-spacing:.06em;
  padding:11px 20px; border-radius:30px; border:1px solid var(--line); background:#fff;
  color:var(--ink-soft); cursor:pointer; transition:all .15s ease;
}
.filter-tab:hover{border-color:var(--teal); color:var(--teal)}
.filter-tab.active{background:var(--grad); border-color:transparent; color:#04211f; font-weight:600}
.filter-tab:focus-visible{outline:2px solid var(--teal); outline-offset:2px}

/* ---------- Portfolio project cards (with photo) ---------- */
.project-card{
  background:#fff; border:1px solid var(--line); border-radius:var(--radius); overflow:hidden;
  transition:transform .15s ease, box-shadow .15s ease, opacity .2s ease;
}
.project-card:hover{transform:translateY(-3px); box-shadow:0 14px 30px rgba(11,42,61,.1)}
.project-card.is-hidden{display:none}
.project-media{position:relative; aspect-ratio:16/10; overflow:hidden; background:var(--navy)}
.project-media img{width:100%; height:100%; object-fit:cover; display:block; transition:transform .4s ease}
.project-card:hover .project-media img{transform:scale(1.06)}
.project-media::after{content:""; position:absolute; inset:0; background:linear-gradient(180deg, rgba(11,42,61,.08) 0%, rgba(11,42,61,.05) 55%, rgba(11,42,61,.35) 100%); pointer-events:none}
.project-mark{position:absolute; top:14px; right:14px; width:26px; height:26px; opacity:.85; z-index:1}
.project-body{padding:20px 22px 22px}
.project-body .meta{font-family:'IBM Plex Mono'; font-size:.7rem; color:var(--teal); text-transform:uppercase; letter-spacing:.05em}
.project-body h3{margin:8px 0 4px; font-size:1.02rem}
.project-body p{margin:0; font-size:.87rem}

/* ---------- Portfolio / clients ---------- */
.clients{display:flex; flex-wrap:wrap; gap:12px}
.clients span{
  font-family:'IBM Plex Mono'; font-size:.76rem; padding:9px 14px; border:1px solid var(--line);
  border-radius:var(--radius); color:var(--ink-soft);
}

/* ---------- Clients marquee ---------- */
.marquee{
  overflow:hidden; position:relative; width:100%;
  -webkit-mask-image:linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image:linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.marquee-track{display:flex; gap:14px; width:max-content; animation:marquee-scroll 32s linear infinite}
.marquee:hover .marquee-track{animation-play-state:paused}
.marquee-track span{
  font-family:'IBM Plex Mono'; font-size:.8rem; padding:12px 20px; border:1px solid var(--line);
  border-radius:30px; color:var(--ink-soft); white-space:nowrap; background:#fff; flex:none;
}
@keyframes marquee-scroll{
  from{transform:translateX(0)}
  to{transform:translateX(-50%)}
}
@media (prefers-reduced-motion: reduce){
  .marquee-track{animation:none; flex-wrap:wrap; width:100%}
}

/* ---------- CTA panel (bordered, no full-bleed gradient fill) ---------- */
/*.cta-panel{*/
/*  position:relative; overflow:hidden; border:1px solid rgba(255,255,255,.16); border-radius:var(--radius);*/
/*  padding:56px 48px; text-align:center; background:linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,0));*/
/*}*/
.cta-panel {
    position: relative;
    overflow: hidden;
    border: 1px solid #4fb86b;
    border-radius: var(--radius);
    padding: 56px 48px;
    text-align: center;
    background: linear-gradient(180deg, #0b2a3d, #0b2a3d);
}
.cta-panel::before{content:""; position:absolute; top:0; left:0; right:0; height:3px; background:var(--grad)}
.cta-panel-grid{
  position:absolute; inset:0; z-index:0; opacity:.10; pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.6) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.6) 1px, transparent 1px);
  background-size:32px 32px;
}
.cta-panel-inner{position:relative; z-index:1}
.cta-panel h2{color:#fff; max-width:36ch; margin-left:auto; margin-right:auto}
.cta-panel p{color:#C9D8DB; max-width:56ch; margin:0 auto 28px}

/* ---------- Contact ---------- */
.contact-grid{display:grid; grid-template-columns:1.1fr .9fr; gap:44px}
.contact-list{list-style:none; margin:0; padding:0}
.contact-list li{display:flex; gap:14px; padding:16px 0; border-bottom:1px solid rgba(255,255,255,.12)}
.contact-list li:last-child{border-bottom:none}
.contact-list .ico{width:36px; height:36px; border-radius:50%; background:rgba(255,255,255,.08); display:flex; align-items:center; justify-content:center; flex:none}
.contact-list b{display:block; color:#fff; font-size:.95rem}
.contact-list span{color:#9FC3C7; font-size:.86rem}
.office-card{background:rgba(255,255,255,.05); border:1px solid rgba(255,255,255,.14); border-radius:var(--radius); padding:20px; margin-bottom:14px}
.office-card .tag{font-family:'IBM Plex Mono'; font-size:.68rem; color:var(--green); text-transform:uppercase; letter-spacing:.07em; margin-bottom:8px; display:block}
.office-card p{color:#C9D8DB; font-size:.88rem; margin:0}

/* ---------- Footer ---------- */
footer.site{background:var(--navy); color:#9FC3C7; padding:36px 0}
.foot-bottom{display:flex; justify-content:space-between; font-size:.78rem; flex-wrap:wrap; gap:10px; align-items:center}
footer.site a{color:#C9D8DB}

/* ---------- Back to top ---------- */
.totop{position:fixed; right:20px; bottom:20px; width:44px; height:44px; border-radius:50%; background:var(--navy); color:#fff;
  display:flex; align-items:center; justify-content:center; box-shadow:0 8px 20px rgba(11,42,61,.3); opacity:0; pointer-events:none; transition:opacity .2s ease; z-index:90}
.totop.show{opacity:1; pointer-events:auto}

/* ---------- Responsive ---------- */
@media (max-width:980px){
  .grid-4, .grid-5{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .grid-2, .feature, .contact-grid{grid-template-columns:1fr}
  .steps{grid-template-columns:repeat(2,1fr); row-gap:24px}
  .gallery{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:640px){
  .stat-row{flex-wrap:wrap; overflow-x:visible; gap:24px}
}
@media (max-width:720px){
  nav.main{display:none}
  .menu-toggle{display:block}
  .grid-4, .grid-3, .grid-2, .grid-5{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .gallery{grid-template-columns:1fr}
  .consult-grid{grid-template-columns:1fr}
  .expertise-row{grid-template-columns:1fr; gap:10px; padding-left:18px !important}
  .cta-band{padding:30px 20px}
  .hero{padding:60px 0 60px}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .card, .gallery img{transition:none}
}

/* ---------- Preloader ---------- */
body.preload-active{overflow:hidden}
#preloader{
  position:fixed; inset:0; z-index:9999; background:var(--navy);
  display:flex; align-items:center; justify-content:center;
  transition:opacity .5s ease, visibility .5s ease;
}
#preloader::before{
  content:""; position:absolute; inset:0; opacity:.14; pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.5) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.5) 1px, transparent 1px);
  background-size:34px 34px;
}
#preloader.preloader-hidden{opacity:0; visibility:hidden}
.preloader-inner{position:relative; z-index:1; display:flex; flex-direction:column; align-items:center; gap:22px}
.preloader-logo{
  width:76px; height:auto; animation:preloader-pulse 1.4s ease-in-out infinite;
  filter:drop-shadow(0 0 24px rgba(14,165,160,.35));
}
@keyframes preloader-pulse{
  0%,100%{transform:scale(1); opacity:1}
  50%{transform:scale(1.07); opacity:.85}
}
.preloader-bar{width:140px; height:3px; background:rgba(255,255,255,.14); border-radius:4px; overflow:hidden}
.preloader-bar span{
  display:block; height:100%; width:0%; background:var(--grad); border-radius:4px;
  animation:preloader-fill 2.5s linear forwards;
}
@keyframes preloader-fill{
  from{width:0%}
  to{width:100%}
}
@media (prefers-reduced-motion: reduce){
  .preloader-logo{animation:none}
  .preloader-bar span{animation-duration:.01s}
}