/* ============================================================
   ARCNODE IT — public site
   Apple-inspired UI system (clarity / deference / depth)
   on the Arcnode IT brand palette — Brand Guide v1.1, May 2026
   ============================================================ */

:root{
  /* Brand palette — binding */
  --near-black:#0A0A0F;
  --navy-900:#042C53;
  --navy-800:#0C447C;
  --blue-600:#185FA5;
  --blue-400:#378ADD;
  --blue-200:#85B7EB;
  --blue-100:#B5D4F4;
  --blue-50:#E6F1FB;
  --light-gray:#F5F5F3;
  --text-secondary-brand:#4A5568;
  --hairline:#E5E7EB;

  /* Semantic surfaces — Apple structure, brand colour */
  --bg-primary:#FFFFFF;
  --bg-secondary:var(--light-gray);
  --bg-elevated:rgba(255,255,255,.72);
  --text-primary:var(--near-black);
  --text-secondary:var(--text-secondary-brand);
  --accent:var(--blue-600);
  --accent-hover:var(--navy-800);
  --border:rgba(10,10,15,.08);
  --shadow-sm:0 1px 3px rgba(10,10,15,.04), 0 4px 16px rgba(10,10,15,.04);
  --shadow-md:0 4px 24px rgba(10,10,15,.07);
  --shadow-lg:0 12px 48px rgba(10,10,15,.10);
  --nav-bg:rgba(255,255,255,.72);

  /* Spacing scale */
  --space-xs:4px; --space-sm:8px; --space-md:16px;
  --space-lg:24px; --space-xl:48px; --space-2xl:96px;

  --radius-card:18px;
  --radius-media:22px;
  --radius-pill:980px;
  --ease:cubic-bezier(.25,.1,.25,1);
  --measure:680px;
  --font-mono:'JetBrains Mono','SF Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
}

@media (prefers-color-scheme: dark){
  :root{
    --bg-primary:#000000;
    --bg-secondary:#0A0A0F;
    --bg-elevated:rgba(29,29,31,.72);
    --text-primary:#F5F5F7;
    --text-secondary:#98A2B3;
    --accent:var(--blue-400);
    --accent-hover:var(--blue-200);
    --border:rgba(255,255,255,.10);
    --shadow-sm:0 1px 3px rgba(0,0,0,.5);
    --shadow-md:0 4px 24px rgba(0,0,0,.55);
    --shadow-lg:0 12px 48px rgba(0,0,0,.6);
    --nav-bg:rgba(0,0,0,.68);
    --hairline:rgba(255,255,255,.12);
  }
}

*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}

body{
  background:var(--bg-primary);
  color:var(--text-primary);
  font-family:'Inter','Helvetica Neue',-apple-system,BlinkMacSystemFont,'SF Pro Text','SF Pro Display',Helvetica,Arial,sans-serif;
  font-size:17px;
  line-height:1.5;
  font-weight:400;   /* Body — Inter Regular */
  letter-spacing:-.01em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

img,svg,video{display:block;max-width:100%;height:auto}
a{color:var(--accent);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--accent-hover)}

::selection{background:var(--blue-100);color:var(--near-black)}

/* ---------------- layout ---------------- */
.wrap{width:100%;max-width:1120px;margin:0 auto;padding:0 24px}
.narrow{max-width:var(--measure);margin-left:auto;margin-right:auto}
section{padding:var(--space-2xl) 0}
section.tight{padding:var(--space-xl) 0}
.center{text-align:center}

/* ---------------- typography ---------------- */
h1,h2,h3,h4{font-weight:700;letter-spacing:-.024em;line-height:1.1}
.hero-title{font-size:clamp(40px,6vw,64px);line-height:1.05;letter-spacing:-.034em;font-weight:700}
h1{font-size:clamp(36px,5vw,48px);line-height:1.1}
h2{font-size:clamp(28px,3.6vw,32px);line-height:1.2}
h3{font-size:21px;line-height:1.25;letter-spacing:-.018em}
h4{font-size:17px;line-height:1.3;letter-spacing:-.014em}

p{font-size:17px;line-height:1.5;color:var(--text-primary)}
.lede{font-size:clamp(19px,2.2vw,21px);line-height:1.45;color:var(--text-secondary);letter-spacing:-.014em}
.body-secondary{color:var(--text-secondary)}
.caption{font-size:13px;line-height:1.4;color:var(--text-secondary);letter-spacing:0}
.eyebrow{
  font-size:13px;font-weight:600;letter-spacing:.02em;
  color:var(--accent);text-transform:none;margin-bottom:var(--space-md)
}
.stack>*+*{margin-top:var(--space-md)}
.stack-lg>*+*{margin-top:var(--space-lg)}

/* ---------------- nav ---------------- */
.nav{
  position:sticky;top:0;z-index:100;
  background:var(--nav-bg);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid var(--border);
}
.nav-inner{
  display:flex;align-items:center;gap:var(--space-lg);
  height:52px;max-width:1120px;margin:0 auto;padding:0 24px;
}
.nav-logo{display:flex;align-items:center;min-height:44px}
.nav-logo img{width:132px}
@media (prefers-color-scheme: dark){ .nav-logo img{content:url('/arcnode-it-logo-dark.svg')} }
.nav-links{display:flex;align-items:center;gap:var(--space-lg);margin-left:auto;list-style:none}
.nav-links a{
  font-size:14px;font-weight:400;color:var(--text-primary);
  display:inline-flex;align-items:center;min-height:44px;
  opacity:.85;transition:opacity .2s var(--ease)
}
.nav-links a:hover{opacity:1;color:var(--text-primary)}
.nav-links li.current a{opacity:1;color:var(--accent)}
.nav-cta{margin-left:var(--space-sm)}
.nav-toggle{
  display:none;margin-left:auto;width:44px;height:44px;
  background:none;border:0;cursor:pointer;position:relative
}
.nav-toggle span{
  position:absolute;left:12px;width:20px;height:1.5px;background:var(--text-primary);
  border-radius:2px;transition:all .3s var(--ease)
}
.nav-toggle span:nth-child(1){top:17px}
.nav-toggle span:nth-child(2){top:26px}
.nav-toggle.open span:nth-child(1){top:21px;transform:rotate(45deg)}
.nav-toggle.open span:nth-child(2){top:21px;transform:rotate(-45deg)}

/* ---------------- buttons ---------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  min-height:44px;padding:12px 24px;border-radius:var(--radius-pill);
  font-size:15px;font-weight:500;letter-spacing:-.01em;
  border:1px solid transparent;cursor:pointer;
  transition:transform .2s var(--ease),filter .2s var(--ease),background .2s var(--ease);
  will-change:transform;
}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{transform:scale(1.02);filter:brightness(1.12);color:#fff}
.btn-secondary{background:transparent;color:var(--accent);border-color:var(--border)}
.btn-secondary:hover{transform:scale(1.02);background:var(--bg-secondary);color:var(--accent)}
.btn-sm{min-height:36px;padding:8px 16px;font-size:14px}
.link-arrow{display:inline-flex;align-items:center;gap:4px;min-height:44px;font-size:15px;font-weight:400}
.link-arrow svg{transition:transform .2s var(--ease)}
.link-arrow:hover svg{transform:translateX(3px)}

/* ---------------- cards ---------------- */
.card{
  background:var(--bg-elevated);
  -webkit-backdrop-filter:blur(20px);
  backdrop-filter:blur(20px);
  border-radius:var(--radius-card);
  border:1px solid var(--border);
  box-shadow:var(--shadow-sm);
  padding:var(--space-lg);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.card-hover:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.card-solid{background:var(--bg-secondary);backdrop-filter:none;-webkit-backdrop-filter:none}

.grid{display:grid;gap:var(--space-lg)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

/* icon tile */
.icon-tile{
  width:44px;height:44px;border-radius:12px;
  background:var(--blue-50);
  display:flex;align-items:center;justify-content:center;
  margin-bottom:var(--space-md);
}
@media (prefers-color-scheme: dark){ .icon-tile{background:rgba(55,138,221,.16)} }
.icon-tile svg{width:22px;height:22px}

/* ---------------- media ---------------- */
.media{
  border-radius:var(--radius-media);overflow:hidden;
  background:transparent;box-shadow:var(--shadow-lg);
  position:relative;
}
.media img{
  width:100%;height:100%;object-fit:cover;display:block;
  border-radius:inherit;
  -webkit-user-drag:none;user-drag:none;   /* stops accidental drag-out; not copy protection */
}
.media-hero{aspect-ratio:16/9}
.brand-visual{box-shadow:var(--shadow-lg)}
.brand-visual svg{width:100%;height:100%;display:block}
.media-4x3{aspect-ratio:4/3}
.media-portrait{aspect-ratio:4/5;border-radius:var(--radius-media);box-shadow:var(--shadow-md)}

/* ---------------- hero ---------------- */
.hero{padding:var(--space-2xl) 0 var(--space-xl);text-align:center}
.hero .lede{max-width:600px;margin:var(--space-lg) auto 0}
.hero-actions{display:flex;gap:var(--space-md);justify-content:center;flex-wrap:wrap;margin-top:var(--space-xl)}

/* ---------------- work / project ---------------- */
.project .media{margin-bottom:var(--space-md)}
.project .tags{font-size:13px;color:var(--accent);font-weight:500;margin-bottom:6px}
.project h3{margin-bottom:4px}
.project .kind{font-size:13px;color:var(--text-secondary);margin-bottom:var(--space-sm)}
.project p:last-child{font-size:15px;color:var(--text-secondary);line-height:1.45}

/* ---------------- team ---------------- */
.person{text-align:center}
.person .media-portrait{max-width:220px;margin:0 auto var(--space-md)}
.person h3{margin-bottom:2px}
.person .role{font-size:15px;color:var(--accent);margin-bottom:var(--space-sm)}
.person p:last-child{font-size:15px;color:var(--text-secondary);max-width:320px;margin:0 auto}

/* ---------------- feature rows (services) ---------------- */
.feature{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-xl);align-items:center}
.feature.reverse .feature-media{order:2}
.feature-body h2{margin-bottom:var(--space-md)}
.feature-body .lede{font-size:19px}

/* ---------------- spec list ---------------- */
.spec-list{list-style:none}
.spec-list li{
  display:flex;gap:var(--space-md);padding:var(--space-md) 0;
  border-bottom:1px solid var(--hairline)
}
.spec-list li:last-child{border-bottom:0}
.spec-list .check{flex:0 0 22px;color:var(--accent);margin-top:2px}
.spec-list h4{margin-bottom:2px}
.spec-list p{font-size:15px;color:var(--text-secondary)}

/* ---------------- CTA band ---------------- */
.cta-band{background:var(--bg-secondary);border-radius:var(--radius-media);padding:var(--space-2xl) var(--space-lg);text-align:center}
.cta-band h2{margin-bottom:var(--space-md)}
.cta-band .lede{max-width:520px;margin:0 auto var(--space-xl)}

/* ---------------- form ---------------- */
.form{display:grid;gap:var(--space-lg)}
.field label{
  display:block;font-size:13px;font-weight:500;color:var(--text-secondary);
  margin-bottom:6px;letter-spacing:0
}
.field input,.field select,.field textarea{
  width:100%;min-height:44px;padding:11px 14px;
  font:inherit;font-size:17px;color:var(--text-primary);
  background:var(--bg-secondary);
  border:1px solid transparent;border-radius:12px;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
  -webkit-appearance:none;appearance:none;
}
.field textarea{min-height:120px;resize:vertical;line-height:1.5}
.field select{
  cursor:pointer;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%23185FA5' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 14px center;padding-right:38px;
}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--accent);box-shadow:0 0 0 4px rgba(24,95,165,.14)
}
.field input::placeholder,.field textarea::placeholder{color:var(--text-secondary);opacity:.6}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-md)}
.form-note{font-size:13px;color:var(--text-secondary)}
.form-error{font-size:15px;color:#C0392B}
@media (prefers-color-scheme: dark){ .form-error{color:#FF6B5E} }
.sent{text-align:center;padding:var(--space-xl) var(--space-lg)}
.sent .icon-tile{margin:0 auto var(--space-lg);width:56px;height:56px;border-radius:16px}
.sent .icon-tile svg{width:28px;height:28px}

/* ---------------- footer ---------------- */
.footer{background:var(--bg-secondary);padding:var(--space-xl) 0 var(--space-lg);font-size:13px}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr;gap:var(--space-xl);padding-bottom:var(--space-xl)}
.footer img{width:132px;margin-bottom:var(--space-md)}
@media (prefers-color-scheme: dark){ .footer img{content:url('/arcnode-it-logo-dark.svg')} }
.footer h4{font-size:13px;margin-bottom:var(--space-sm);color:var(--text-primary)}
.footer ul{list-style:none}
.footer li{margin-bottom:6px}
.footer a{color:var(--text-secondary);display:inline-flex;align-items:center;min-height:28px}
.footer a:hover{color:var(--accent)}
.footer .body-secondary{font-size:13px;line-height:1.5}
.footer-bottom{
  border-top:1px solid var(--hairline);padding-top:var(--space-lg);
  display:flex;justify-content:space-between;gap:var(--space-md);flex-wrap:wrap;
  color:var(--text-secondary)
}

/* ---------------- motion ---------------- */
@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:none}}
.reveal{opacity:0}
.reveal.in{animation:fadeUp .7s var(--ease) forwards}

@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}
  .reveal{opacity:1;animation:none}
  html{scroll-behavior:auto}
}

/* ---------------- responsive ---------------- */
@media (max-width:900px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .feature{grid-template-columns:1fr;gap:var(--space-lg)}
  .feature.reverse .feature-media{order:0}
  .footer-top{grid-template-columns:1fr 1fr;gap:var(--space-lg)}
}
@media (max-width:700px){
  section{padding:var(--space-xl) 0}
  .grid-4,.grid-3,.grid-2{grid-template-columns:1fr}
  .field-row{grid-template-columns:1fr}
  .nav-links{
    position:fixed;inset:52px 0 auto 0;flex-direction:column;align-items:stretch;
    gap:0;background:var(--nav-bg);
    -webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);
    border-bottom:1px solid var(--border);padding:var(--space-sm) 24px var(--space-lg);
    margin-left:0;transform:translateY(-8px);opacity:0;pointer-events:none;
    transition:opacity .25s var(--ease),transform .25s var(--ease)
  }
  .nav-links.open{opacity:1;transform:none;pointer-events:auto}
  .nav-links a{font-size:17px;min-height:48px;border-bottom:1px solid var(--hairline)}
  .nav-links li:last-child a{border-bottom:0}
  .nav-cta{margin-left:0;margin-top:var(--space-md)}
  .nav-cta .btn{width:100%}
  .nav-toggle{display:block}
  .footer-top{grid-template-columns:1fr;gap:var(--space-lg)}
  .footer a{min-height:44px}
  .footer li{margin-bottom:0}
  .cta-band{padding:var(--space-xl) var(--space-md)}
}

/* ============================================================
   Homepage dark animated hero + transparent-over-hero nav
   Light/dark, mobile and reduced-motion aware.
   ============================================================ */
.hero-dark{
  position:relative;isolation:isolate;overflow:hidden;
  min-height:88vh; min-height:88svh;
  display:flex;align-items:center;justify-content:center;
  padding:96px 0;text-align:center;
}
.hero-dark .hero-content{position:relative;z-index:1}
.hero-bg{position:absolute;inset:0;z-index:-2}
.hero-bg svg{width:100%;height:100%;display:block}
.hero-scrim{
  position:absolute;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(ellipse 62% 60% at 50% 44%, rgba(3,9,20,.66), rgba(3,9,20,.26) 66%, transparent 100%),
    linear-gradient(180deg, rgba(6,12,24,.32) 0%, rgba(6,12,24,.12) 40%, var(--bg-primary) 100%);
}
/* Hero text is light in BOTH colour schemes (the hero is always dark) */
.hero-dark .hero-title{color:#fff;text-shadow:0 2px 30px rgba(0,0,0,.35)}
.hero-dark .lede{color:rgba(233,241,251,.92)}
.hero-dark .btn-secondary{
  background:rgba(255,255,255,.10);color:#fff;border-color:rgba(255,255,255,.30);
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
}
.hero-dark .btn-secondary:hover{background:rgba(255,255,255,.18);color:#fff}
.hero-dark a:focus-visible,
.home-hero .nav:not(.scrolled) a:focus-visible{outline:2px solid #fff;outline-offset:3px;border-radius:8px}

/* Nav: fixed + transparent while over the hero (home only) so the hero sits
   behind it; reverts to the normal glass nav once .scrolled is applied by JS. */
.home-hero .nav{
  position:fixed;left:0;right:0;top:0;
  transition:background .3s var(--ease),border-color .3s var(--ease);
}
.home-hero .nav:not(.scrolled){
  background:transparent;border-bottom-color:transparent;
  -webkit-backdrop-filter:none;backdrop-filter:none;
}
.home-hero .nav:not(.scrolled) .nav-links a{color:#fff;opacity:.9}
.home-hero .nav:not(.scrolled) .nav-links a:hover{color:#fff;opacity:1}
.home-hero .nav:not(.scrolled) .nav-links li.current a{color:#fff;opacity:1}
.home-hero .nav:not(.scrolled) .nav-toggle span{background:#fff}
.home-hero .nav:not(.scrolled) .nav-logo img{content:url('/arcnode-it-logo-dark.svg')}

/* brand-visual (hero background) animation */
.bv-core{transform-box:fill-box;transform-origin:center;animation:bvCore 3.4s ease-in-out infinite}
@keyframes bvCore{0%,100%{transform:scale(1);opacity:.9}50%{transform:scale(1.22);opacity:1}}
.bv-twinkle{transform-box:fill-box;transform-origin:center;animation:bvTwinkle 4s ease-in-out infinite;animation-delay:var(--d,0s)}
@keyframes bvTwinkle{0%,100%{opacity:.25}50%{opacity:.9}}
.bv-glow{animation:bvGlow 7s ease-in-out infinite}
@keyframes bvGlow{0%,100%{opacity:.75}50%{opacity:1}}

/* Fast-scroll reveal: snap in quickly so nothing is missed. No !important, so
   the reduced-motion block still wins for visitors who prefer no motion. */
.reveal.in.instant{animation-duration:.2s}

@media (max-width:700px){
  .hero-dark{min-height:82vh;min-height:82svh;padding:104px 0 72px}

  /* The open mobile menu must be a SOLID, opaque panel on EVERY page — over
     the dark animated hero a translucent dropdown lets the headline bleed
     through; elsewhere solid keeps it consistent and readable. */
  .nav-links{
    background:var(--bg-primary);
    -webkit-backdrop-filter:none;backdrop-filter:none;
    box-shadow:0 20px 48px rgba(0,0,0,.5);
  }
  /* On the home hero the nav links are white while transparent-over-hero;
     once the menu opens (nav goes solid) force readable colours regardless. */
  .home-hero .nav .nav-links.open a{color:var(--text-primary);opacity:1}
  .home-hero .nav .nav-links.open li.current a{color:var(--accent)}
}