/* ==========================================================================
   Volture Dynamics — engineering-firm design system
   Grayscale-first, hairline structure, mono technical labels, blue used
   only as a precise accent (never as background, gradient, or glow).
   ========================================================================== */

:root{
  --bg: #0a0a0b;
  --bg-raised: #0e0e10;
  --panel: #131315;
  --line: #232326;
  --line-strong: #38383c;
  --ink-1: #f1efe9;
  --ink-2: #9d9d9e;
  --ink-3: #656567;
  --accent: #4f8fff;
  --accent-dim: #3a6bc4;
  --radius: 2px;
  --sans: 'Archivo', 'Helvetica Neue', Arial, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', monospace;
  --ease: cubic-bezier(.4,0,.2,1);
  --col-gutter: 64px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--bg);
  color:var(--ink-1);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{ font-family:var(--sans); margin:0; font-weight:600; letter-spacing:-0.01em; }
p{ margin:0; color:var(--ink-2); }
a{ color:inherit; text-decoration:none; }
ul,ol{ margin:0; padding:0; list-style:none; }
button{ font-family:inherit; cursor:pointer; background:none; border:none; color:inherit; }
img,svg{ display:block; max-width:100%; }
::selection{ background:var(--accent); color:#04070d; }

.wrap{ width:min(1240px, 92vw); margin-inline:auto; }
.skip-link{ position:absolute; left:-999px; top:0; background:var(--ink-1); color:var(--bg); padding:.6em 1em; z-index:999; }
.skip-link:focus{ left:1rem; top:1rem; }

.mono{ font-family:var(--mono); }
.upx{ text-transform:uppercase; letter-spacing:.08em; }

/* reveal-on-scroll: short, restrained */
.reveal{ opacity:0; transform:translateY(10px); transition:opacity .55s var(--ease), transform .55s var(--ease); }
.reveal.is-visible{ opacity:1; transform:none; }

/* ---------- Buttons ---------- */
.btn{ display:inline-flex; align-items:center; gap:10px; padding:.85em 1.5em; font-family:var(--mono); font-size:.78rem; font-weight:500; text-transform:uppercase; letter-spacing:.07em; border-radius:var(--radius); border:1px solid var(--line-strong); transition:border-color .2s var(--ease), background .2s var(--ease), color .2s var(--ease); white-space:nowrap; }
.btn-primary{ background:var(--ink-1); color:#0a0a0b; border-color:var(--ink-1); }
.btn-primary:hover{ background:var(--accent); border-color:var(--accent); color:#04070d; }
.btn-outline{ background:transparent; color:var(--ink-1); border-color:var(--line-strong); }
.btn-outline:hover{ border-color:var(--ink-1); }
.btn-text{ display:inline-flex; align-items:center; gap:8px; font-family:var(--mono); font-size:.78rem; text-transform:uppercase; letter-spacing:.07em; color:var(--ink-2); border-bottom:1px solid var(--line-strong); padding-bottom:3px; transition:color .2s, border-color .2s; }
.btn-text:hover{ color:var(--ink-1); border-color:var(--ink-1); }
.btn-text .arrow{ transition:transform .2s var(--ease); }
.btn-text:hover .arrow{ transform:translateX(3px); }

/* ---------- Header ---------- */
.site-header{
  position:fixed; top:0; left:0; right:0; z-index:50;
  border-bottom:1px solid var(--line);
  transition:background .3s var(--ease);
}
.site-header.is-scrolled{ background:rgba(10,10,11,.94); backdrop-filter:none; }
.header-inner{ display:flex; align-items:center; justify-content:space-between; gap:32px; padding:14px 0; }
.brand{ display:flex; align-items:center; }
.brand-logo{ height:60px; width:auto; filter:brightness(1.3) contrast(1.12); flex-shrink:0; display:block; }
.brand-logo-sm{ height:46px; }

.main-nav{ display:flex; gap:2.25rem; margin-inline:auto; }
.main-nav a{
  font-family:var(--mono); font-size:.76rem; text-transform:uppercase; letter-spacing:.07em;
  color:var(--ink-2); position:relative; padding:4px 0; transition:color .2s var(--ease);
}
.main-nav a::after{ content:""; position:absolute; left:0; right:100%; bottom:-1px; height:1px; background:var(--ink-1); transition:right .25s var(--ease); }
.main-nav a:hover{ color:var(--ink-1); }
.main-nav a:hover::after{ right:0; }
.header-actions{ display:flex; align-items:center; gap:14px; }
.header-cta-desktop{ padding:.7em 1.3em; }

.nav-toggle{ display:none; flex-direction:column; gap:5px; padding:6px; }
.nav-toggle span{ width:22px; height:1px; background:var(--ink-1); }

/* ---------- Section scaffolding ---------- */
.section{ padding:132px 0; border-top:1px solid var(--line); }
.section:first-of-type{ border-top:none; }
.section-alt{ background:var(--bg-raised); }

.section-head{ display:grid; grid-template-columns:96px 1fr; gap:var(--col-gutter); margin-bottom:76px; }
.section-head .num{ font-family:var(--mono); font-size:.8rem; color:var(--ink-3); padding-top:.35em; }
.section-head .head-copy{ max-width:640px; }
.section-head h2{ font-size:clamp(1.7rem, 2.6vw, 2.25rem); font-weight:600; margin-bottom:18px; line-height:1.2; }
.section-head p{ font-size:1rem; line-height:1.65; }
.kicker{ display:block; font-family:var(--mono); font-size:.74rem; text-transform:uppercase; letter-spacing:.09em; color:var(--ink-3); margin-bottom:10px; }

/* ---------- Hero ---------- */
.hero{ padding:172px 0 0; }
.hero-grid{ display:grid; grid-template-columns:1.05fr .95fr; gap:72px; align-items:center; padding-bottom:96px; }
.hero-eyebrow{ display:flex; align-items:center; gap:10px; font-family:var(--mono); font-size:.76rem; text-transform:uppercase; letter-spacing:.09em; color:var(--ink-2); margin-bottom:28px; }
.hero-eyebrow .tick{ width:14px; height:1px; background:var(--accent); flex-shrink:0; }
.hero h1{ font-size:clamp(2.1rem, 3.5vw, 3.15rem); font-weight:600; line-height:1.18; max-width:15ch; color:var(--ink-1); }
.hero-sub{ margin-top:26px; max-width:46ch; font-size:1.05rem; line-height:1.7; color:var(--ink-2); }
.hero-actions{ display:flex; align-items:center; gap:28px; margin-top:40px; flex-wrap:wrap; }

.hero-stats{ display:grid; grid-template-columns:repeat(3,1fr); margin-top:76px; border-top:1px solid var(--line); padding-top:28px; max-width:640px; }
.stat{ display:flex; flex-direction:column; gap:8px; border-left:1px solid var(--line); padding-left:20px; }
.stat:first-child{ border-left:none; padding-left:0; }
.stat-num{ font-family:var(--mono); font-size:1.5rem; font-weight:500; color:var(--ink-1); }
.stat-label{ font-size:.78rem; color:var(--ink-3); max-width:20ch; line-height:1.5; }

/* technical panel + viewfinder frame, reused across hero + applications */
.tech-frame{ position:relative; border:1px solid var(--line-strong); background:var(--panel); }
.tech-frame .corner{ position:absolute; width:14px; height:14px; z-index:2; }
.tech-frame .corner.tl{ top:-1px; left:-1px; border-top:1px solid var(--ink-2); border-left:1px solid var(--ink-2); }
.tech-frame .corner.tr{ top:-1px; right:-1px; border-top:1px solid var(--ink-2); border-right:1px solid var(--ink-2); }
.tech-frame .corner.bl{ bottom:-1px; left:-1px; border-bottom:1px solid var(--ink-2); border-left:1px solid var(--ink-2); }
.tech-frame .corner.br{ bottom:-1px; right:-1px; border-bottom:1px solid var(--ink-2); border-right:1px solid var(--ink-2); }

.hero-visual{ aspect-ratio:4/5; display:flex; flex-direction:column; }
.hero-visual .tech-meta{ display:flex; justify-content:space-between; padding:16px 18px 0; font-family:var(--mono); font-size:.68rem; letter-spacing:.06em; color:var(--ink-3); }
.hero-visual .tech-art{ flex:1; display:flex; align-items:center; justify-content:center; padding:12px 24px; }
.hero-visual .tech-art svg{ width:100%; max-width:280px; }
.hero-visual .tech-legend{ border-top:1px solid var(--line); padding:16px 18px 18px; display:flex; flex-direction:column; gap:9px; }
.legend-row{ display:flex; align-items:center; gap:10px; font-family:var(--mono); font-size:.68rem; letter-spacing:.03em; color:var(--ink-2); }
.legend-row .sw{ width:6px; height:6px; flex-shrink:0; background:var(--ink-3); }
.legend-row.is-accent .sw{ background:var(--accent); }
.tech-art .line{ stroke:var(--line-strong); stroke-width:1.25; fill:none; }
.tech-art .line-soft{ stroke:var(--ink-3); stroke-width:1; fill:none; stroke-dasharray:3 4; }
.tech-art .node{ fill:var(--ink-2); }
.tech-art .node-accent{ fill:var(--accent); }

/* ---------- Spec strip ---------- */
.spec-strip{ border-top:1px solid var(--line); border-bottom:1px solid var(--line); padding:22px 0; }
.spec-strip .wrap{ display:flex; flex-wrap:wrap; gap:12px 28px; justify-content:center; }
.spec-strip span{ font-family:var(--mono); font-size:.72rem; text-transform:uppercase; letter-spacing:.06em; color:var(--ink-3); }

/* ---------- Architecture diagram (Platform) ---------- */
.arch-diagram{ display:grid; grid-template-columns:1fr 1fr 1fr; }
.arch-tier{ border:1px solid var(--line); border-left:none; padding:36px 32px; position:relative; }
.arch-tier:first-child{ border-left:1px solid var(--line); }
.arch-tier::after{
  content:""; position:absolute; top:50%; right:-1px; width:32px; height:1px; background:var(--line-strong);
  transform:translate(100%,-50%); z-index:1;
}
.arch-tier:last-child::after{ display:none; }
.arch-index{ font-family:var(--mono); font-size:.78rem; color:var(--ink-3); margin-bottom:22px; }
.arch-tier h3{ font-size:1.15rem; margin-bottom:12px; }
.arch-tier > p{ font-size:.92rem; margin-bottom:26px; line-height:1.6; }
.arch-spec{ border-top:1px solid var(--line); padding-top:18px; display:flex; flex-direction:column; gap:11px; }
.arch-spec li{ font-size:.84rem; color:var(--ink-2); padding-left:14px; position:relative; }
.arch-spec li::before{ content:"–"; position:absolute; left:0; color:var(--ink-3); }

/* ---------- Capabilities triptych (Solutions) ---------- */
.cap-grid{ display:grid; grid-template-columns:repeat(3,1fr); }
.cap-col{ border-left:1px solid var(--line); padding:0 40px; }
.cap-col:first-child{ border-left:none; padding-left:0; }
.cap-col:last-child{ padding-right:0; }
.cap-index{ font-family:var(--mono); font-size:1.4rem; color:var(--ink-3); margin-bottom:24px; }
.cap-col h3{ font-size:1.2rem; margin-bottom:14px; }
.cap-col p{ font-size:.92rem; line-height:1.65; margin-bottom:26px; }
.cap-tags{ display:flex; flex-wrap:wrap; gap:8px; }
.cap-tag{ font-family:var(--mono); font-size:.68rem; text-transform:uppercase; letter-spacing:.04em; color:var(--ink-2); border:1px solid var(--line-strong); padding:.45em .7em; border-radius:var(--radius); }

/* ---------- How it works: ruler timeline ---------- */
.ruler{ display:flex; border-top:1px solid var(--line-strong); }
.ruler-item{ flex:1; padding:22px 28px 0; position:relative; border-right:1px solid var(--line); }
.ruler-item:last-child{ border-right:none; }
.ruler-item::before{ content:""; position:absolute; top:-1px; left:0; width:1px; height:10px; background:var(--ink-2); }
.ruler-index{ font-family:var(--mono); font-size:.78rem; color:var(--ink-3); margin-bottom:16px; display:block; }
.ruler-item h3{ font-size:1.02rem; margin-bottom:10px; }
.ruler-item p{ font-size:.86rem; line-height:1.6; }

/* ---------- Industries index ---------- */
.industry-list{ border-top:1px solid var(--line); }
.industry-row{ display:grid; grid-template-columns:90px 1.1fr 1.9fr; gap:var(--col-gutter); align-items:baseline; padding:26px 0; border-bottom:1px solid var(--line); transition:background .2s var(--ease); }
.industry-row:hover{ background:var(--bg-raised); }
.industry-code{ font-family:var(--mono); font-size:.78rem; color:var(--ink-3); }
.industry-row h3{ font-size:1.05rem; font-weight:600; }
.industry-row p{ font-size:.9rem; }

/* ---------- Applications (case studies) ---------- */
.app-block{ display:grid; grid-template-columns:.95fr 1.05fr; gap:72px; align-items:center; padding:64px 0; border-bottom:1px solid var(--line); }
.app-block:first-child{ padding-top:0; }
.app-block:last-child{ border-bottom:none; padding-bottom:0; }
.app-block.is-reverse{ grid-template-columns:1.05fr .95fr; }
.app-block.is-reverse .app-visual{ order:2; }
.app-visual{ aspect-ratio:4/3; }
.app-visual .tech-art{ height:100%; display:flex; align-items:center; justify-content:center; padding:28px; }
.app-visual .tech-art svg{ width:100%; max-width:260px; }
.app-meta{ display:flex; justify-content:space-between; padding:14px 16px 0; font-family:var(--mono); font-size:.66rem; letter-spacing:.06em; color:var(--ink-3); }
.app-code{ font-family:var(--mono); font-size:.76rem; color:var(--ink-3); margin-bottom:16px; display:block; }
.app-text h3{ font-size:1.35rem; margin-bottom:16px; line-height:1.3; }
.app-text p{ font-size:.95rem; line-height:1.7; margin-bottom:24px; max-width:52ch; }

/* ---------- Company ---------- */
.company-grid{ display:grid; grid-template-columns:1.2fr .8fr; gap:72px; }
.company-copy h2{ font-size:clamp(1.7rem,2.6vw,2.25rem); margin:16px 0 22px; line-height:1.25; }
.company-copy p{ font-size:1rem; line-height:1.7; margin-bottom:32px; max-width:56ch; }
.fact-list{ display:flex; flex-direction:column; }
.fact-row{ border-top:1px solid var(--line); padding:20px 0; }
.fact-row:last-child{ border-bottom:1px solid var(--line); }
.fact-row .label{ font-family:var(--mono); font-size:.68rem; text-transform:uppercase; letter-spacing:.06em; color:var(--ink-3); display:block; margin-bottom:8px; }
.fact-row .value{ font-size:.96rem; color:var(--ink-1); line-height:1.5; }

/* ---------- Contact ---------- */
.contact-grid{ display:grid; grid-template-columns:1fr 1fr; gap:80px; }
.contact-copy h2{ font-size:clamp(1.7rem,2.6vw,2.25rem); margin:16px 0 18px; }
.contact-copy p{ font-size:1rem; line-height:1.65; margin-bottom:30px; max-width:44ch; }
.contact-email{ display:inline-block; font-family:var(--mono); font-size:1.05rem; color:var(--ink-1); border-bottom:1px solid var(--line-strong); padding-bottom:5px; margin-bottom:44px; transition:border-color .2s, color .2s; }
.contact-email:hover{ border-color:var(--accent); color:var(--accent); }
.contact-meta{ display:flex; gap:44px; }
.contact-meta .label{ font-family:var(--mono); font-size:.68rem; text-transform:uppercase; letter-spacing:.06em; color:var(--ink-3); display:block; margin-bottom:6px; }
.contact-meta .value{ font-size:.88rem; color:var(--ink-2); }

.contact-form{ display:flex; flex-direction:column; gap:26px; }
.form-row{ display:flex; flex-direction:column; gap:10px; }
.form-row label{ font-family:var(--mono); font-size:.68rem; text-transform:uppercase; letter-spacing:.06em; color:var(--ink-3); }
.form-row input, .form-row textarea{
  background:transparent; border:none; border-bottom:1px solid var(--line-strong); border-radius:0;
  padding:.5em 0; color:var(--ink-1); font-family:var(--sans); font-size:.98rem; resize:vertical;
  transition:border-color .2s;
}
.form-row input:focus, .form-row textarea:focus{ outline:none; border-color:var(--ink-1); }
.form-submit{ align-self:flex-start; margin-top:8px; }
.form-status{ font-size:.82rem; color:var(--ink-2); min-height:1.2em; margin:0; font-family:var(--mono); }
.form-status.is-error{ color:#d97757; }

/* ---------- Footer ---------- */
.site-footer{ border-top:1px solid var(--line); padding:72px 0 28px; }
.footer-inner{ display:flex; justify-content:space-between; gap:60px; flex-wrap:wrap; margin-bottom:56px; }
.footer-brand{ max-width:320px; }
.footer-brand .brand{ margin-bottom:16px; }
.footer-brand p{ font-size:.88rem; line-height:1.6; }
.footer-cols{ display:flex; gap:64px; }
.footer-cols h4{ font-family:var(--mono); font-size:.68rem; text-transform:uppercase; letter-spacing:.06em; color:var(--ink-3); margin-bottom:18px; font-weight:500; }
.footer-cols a{ display:block; color:var(--ink-2); font-size:.9rem; margin-bottom:12px; transition:color .2s; }
.footer-cols a:hover{ color:var(--ink-1); }
.footer-bottom{ display:flex; justify-content:space-between; font-family:var(--mono); font-size:.72rem; color:var(--ink-3); border-top:1px solid var(--line); padding-top:26px; flex-wrap:wrap; gap:10px; }

/* ---------- Responsive ---------- */
@media (max-width: 980px){
  .main-nav{ display:none; }
  .nav-toggle{ display:flex; }
  .header-cta-desktop{ display:none; }
  .site-header.nav-open .main-nav{
    display:flex; position:fixed; inset:72px 0 0 0; background:var(--bg); flex-direction:column;
    padding:40px 8vw; gap:26px; font-size:1rem; border-top:1px solid var(--line); overflow-y:auto;
  }
  .brand-logo{ height:44px; }
  .hero{ padding-top:132px; }
  .hero-grid{ grid-template-columns:1fr; gap:48px; }
  .hero-visual{ order:-1; aspect-ratio:16/10; }
  .hero-stats{ grid-template-columns:1fr; gap:20px; max-width:none; }
  .stat{ border-left:none; padding-left:0; border-top:1px solid var(--line); padding-top:16px; }
  .stat:first-child{ border-top:none; padding-top:0; }
  .section{ padding:88px 0; }
  .section-head{ grid-template-columns:1fr; gap:14px; margin-bottom:52px; }
  .arch-diagram{ grid-template-columns:1fr; }
  .arch-tier{ border-left:1px solid var(--line) !important; border-top:none; }
  .arch-tier::after{ display:none; }
  .cap-grid{ grid-template-columns:1fr; gap:44px; }
  .cap-col{ border-left:none !important; padding:0 !important; }
  .ruler{ flex-direction:column; border-top:none; }
  .ruler-item{ border-right:none; border-top:1px solid var(--line-strong); padding:24px 0 0; }
  .ruler-item::before{ display:none; }
  .industry-row{ grid-template-columns:56px 1fr; gap:4px 16px; }
  .industry-row p{ grid-column:2 / -1; margin-top:2px; }
  .app-block, .app-block.is-reverse{ grid-template-columns:1fr; gap:32px; }
  .app-block.is-reverse .app-visual{ order:0; }
  .company-grid{ grid-template-columns:1fr; gap:44px; }
  .contact-grid{ grid-template-columns:1fr; gap:52px; }
  .footer-inner{ flex-direction:column; }
  .footer-cols{ gap:36px; flex-wrap:wrap; }
}

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; scroll-behavior:auto !important; }
}