/* TopBytes Ltd — site stylesheet.
 * Palette is taken from the TopBytes logo: circuit-board greens, teal and
 * the blue monitor bezel, on a near-black navy background. */

:root {
  --bg: #070b14;
  --bg-alt: #0c1322;
  --surface: #111a2c;
  --surface-2: #16223a;
  --border: #22314f;
  --text: #e6edf7;
  --muted: #9aa8c0;
  --green: #84d95a;
  --green-dark: #46993e;
  --teal: #3fd29a;
  --aqua: #39b5b5;
  --blue: #2257b5;
  --accent-grad: linear-gradient(135deg, var(--green) 0%, var(--teal) 50%, var(--aqua) 100%);
  --radius: 14px;
  --maxw: 1180px;
  --font-head: "Space Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--teal); text-decoration: none; }
a:hover { color: var(--green); }

h1, h2, h3, h4 {
  font-family: var(--font-head);
  line-height: 1.15;
  margin: 0 0 .6em;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2.3rem, 5vw, 3.7rem); font-weight: 700; }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.5rem); font-weight: 700; }
h3 { font-size: 1.3rem; font-weight: 600; }
p { margin: 0 0 1em; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

.grad-text {
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-head);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: .9rem;
}

.lead { font-size: 1.15rem; color: var(--muted); max-width: 46rem; }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--teal); color: #000; padding: .5rem 1rem; z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---------------------------------------------------------------- header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(7, 11, 20, .82);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid rgba(34, 49, 79, .6);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: .65rem; color: var(--text); }
.brand img { width: 42px; }
.brand span {
  font-family: var(--font-head); font-weight: 700; font-size: 1.25rem; letter-spacing: .08em;
}
.nav-links { display: flex; align-items: center; gap: 1.8rem; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--muted); font-weight: 500; font-size: .95rem; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); }
.nav-links a.btn-primary, .nav-links a.btn-primary:hover { color: #04110b; }
.nav-toggle {
  display: none; background: none; border: 1px solid var(--border); border-radius: 8px;
  color: var(--text); padding: .4rem .6rem; font-size: 1.1rem; cursor: pointer;
}

/* ---------------------------------------------------------------- buttons */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .8rem 1.4rem; border-radius: 999px;
  font-weight: 600; font-size: .98rem; border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent-grad); color: #04110b; }
.btn-primary:hover { color: #04110b; box-shadow: 0 8px 28px rgba(63, 210, 154, .28); }
.btn-ghost { border-color: var(--border); color: var(--text); background: rgba(255,255,255,.02); }
.btn-ghost:hover { border-color: var(--teal); color: var(--text); }
.btn-row { display: flex; flex-wrap: wrap; gap: .8rem; }

/* ---------------------------------------------------------------- hero */
.hero {
  position: relative; overflow: hidden;
  padding: clamp(4rem, 10vw, 7.5rem) 0 clamp(3.5rem, 8vw, 6rem);
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(34, 87, 181, .35), transparent 60%),
    radial-gradient(700px 420px at 5% 110%, rgba(63, 210, 154, .14), transparent 60%),
    var(--bg);
}
.hero::before {
  /* faint circuit-board grid */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(132, 217, 90, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(132, 217, 90, .05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 60% 40%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 60% 40%, #000 30%, transparent 75%);
}
.hero-grid {
  position: relative; display: grid; grid-template-columns: 1.15fr .85fr;
  gap: 3rem; align-items: center;
}
.hero h1 { margin-bottom: 1.2rem; }
.hero .lead { margin-bottom: 2rem; }
.hero-art img { width: 100%; max-width: 440px; margin-left: auto; filter: drop-shadow(0 20px 60px rgba(34, 87, 181, .35)); }

.page-hero { padding: clamp(3.5rem, 8vw, 5.5rem) 0 clamp(2.5rem, 5vw, 3.5rem); }

/* ---------------------------------------------------------------- sections */
section { padding: clamp(3.5rem, 8vw, 6rem) 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { max-width: 48rem; margin-bottom: 2.8rem; }

.stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1px;
  background: var(--border); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; margin-top: 3.5rem; position: relative;
}
.stat { background: var(--surface); padding: 1.4rem 1.5rem; }
.stat strong { display: block; font-family: var(--font-head); font-size: 1.6rem; }
.stat span { color: var(--muted); font-size: .92rem; }

/* ---------------------------------------------------------------- products */
.products { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.6rem; }
.product {
  display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; transition: border-color .2s ease, transform .2s ease;
}
.product:hover { border-color: rgba(63, 210, 154, .55); transform: translateY(-3px); }
.product-media {
  aspect-ratio: 16 / 9; background: #000; display: flex; align-items: center; justify-content: center;
  border-bottom: 1px solid var(--border); overflow: hidden;
}
.product-media img { width: 100%; height: 100%; object-fit: cover; }
.product-media.contain { background: radial-gradient(circle at 50% 40%, #1b2945, #0a0f1b 70%); }
.product-media.contain img { object-fit: contain; padding: 1.2rem; }
.product-body { padding: 1.6rem 1.6rem 1.8rem; display: flex; flex-direction: column; flex: 1; }
.product-body h3 { font-size: 1.45rem; margin-bottom: .25rem; }
.tagline { color: var(--green); font-weight: 500; margin-bottom: .9rem; }
.product-body p { color: var(--muted); }
.features { list-style: none; padding: 0; margin: 0 0 1.4rem; display: flex; flex-wrap: wrap; gap: .45rem; }
.features li {
  font-size: .8rem; padding: .25rem .65rem; border-radius: 999px;
  background: rgba(63, 210, 154, .08); border: 1px solid rgba(63, 210, 154, .22); color: #bfeedd;
}
.product-links { margin-top: auto; display: flex; flex-wrap: wrap; gap: 1.2rem; font-weight: 600; font-size: .95rem; }
.product-links a::after { content: " →"; }

.badge {
  display: inline-block; font-size: .7rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  padding: .2rem .55rem; border-radius: 6px; margin-left: .5rem; vertical-align: middle;
  background: rgba(34, 87, 181, .35); color: #b9cdf5; border: 1px solid rgba(34, 87, 181, .7);
}

.platform {
  margin-top: 2.2rem; padding: 1.6rem 1.8rem; border-radius: var(--radius);
  border: 1px dashed var(--border); color: var(--muted); display: grid; grid-template-columns: auto 1fr; gap: 1.2rem; align-items: center;
}
.platform .icon { font-size: 1.8rem; }
.platform strong { color: var(--text); }

/* ---------------------------------------------------------------- cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.cards.two { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.7rem; transition: border-color .2s ease;
}
.card:hover { border-color: rgba(63, 210, 154, .45); }
.card .icon {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(63, 210, 154, .1); border: 1px solid rgba(63, 210, 154, .25);
  margin-bottom: 1.1rem; color: var(--teal);
}
.card .icon svg { width: 24px; height: 24px; }
.card p { color: var(--muted); margin-bottom: 0; }
.card p + p { margin-top: .8rem; }
.card ul { color: var(--muted); padding-left: 1.1rem; margin: .8rem 0 0; }
.card a.more { display: inline-block; margin-top: 1rem; font-weight: 600; }
.card a.more::after { content: " →"; }

/* ---------------------------------------------------------------- long-form */
.prose { max-width: 50rem; }
.prose p, .prose li { color: var(--muted); }
.prose h2 { margin-top: 2.5rem; }
.prose h3 { margin-top: 1.8rem; color: var(--text); }
.prose strong { color: var(--text); }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start; }

.figure-row { display: flex; gap: 1.2rem; align-items: center; }

/* ---------------------------------------------------------------- CTA + contact */
.cta {
  border-radius: calc(var(--radius) + 6px); padding: clamp(2rem, 5vw, 3.5rem);
  background:
    radial-gradient(600px 300px at 100% 0%, rgba(34, 87, 181, .45), transparent 70%),
    linear-gradient(135deg, #0f1d33, #0b1424);
  border: 1px solid var(--border);
  display: grid; grid-template-columns: 1.3fr 1fr; gap: 2rem; align-items: center;
}
.cta p { color: var(--muted); }
.contact-list { list-style: none; margin: 0; padding: 0; display: grid; gap: .9rem; }
.contact-list li { display: flex; gap: .8rem; align-items: center; }
.contact-list svg { width: 20px; height: 20px; color: var(--teal); flex: none; }

/* ---------------------------------------------------------------- footer */
.site-footer { border-top: 1px solid var(--border); padding: 3.5rem 0 2rem; background: #05080f; color: var(--muted); font-size: .93rem; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 2rem; margin-bottom: 2.5rem; }
.footer-grid h4 { font-size: .85rem; letter-spacing: .12em; text-transform: uppercase; color: var(--text); margin-bottom: 1rem; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .5rem; }
.footer-grid a { color: var(--muted); }
.footer-grid a:hover { color: var(--text); }
.footer-brand img { width: 120px; margin-bottom: 1rem; }
.footer-legal { border-top: 1px solid var(--border); padding-top: 1.5rem; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; font-size: .85rem; }

/* ---------------------------------------------------------------- responsive */
@media (max-width: 960px) {
  .hero-grid, .split, .cta { grid-template-columns: 1fr; }
  .hero-art { display: none; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .container { padding: 0 16px; }
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: 68px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--border); padding: .5rem 16px 1rem;
  }
  .nav-links.open { display: flex; }
  .nav-links li a { display: block; padding: .8rem 0; border-bottom: 1px solid var(--border); }
  .nav-links .btn { margin-top: .8rem; justify-content: center; }
  .products, .cards, .cards.two { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .platform { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* ---------------------------------------------------------------- utilities */
.page-hero.tall { min-height: 55vh; }
.product-media.contain img.logo-tile { max-height: 78%; }
.mt-sm { margin-top: 1.5rem; }
.mt-lg { margin-top: 3rem; }