/* =========================================================================
   Network Development Corp — Deep Signal design system
   Dark, technical, precise. One electric-azure accent, blue-tinted blacks.
   ========================================================================= */

:root {
  /* Palette — Deep Signal */
  --bg:            #0A0E17;
  --bg-2:          #0C111C;
  --surface:       #111A28;
  --surface-2:     #16223440;
  --line:          rgba(130, 165, 225, 0.13);
  --line-strong:   rgba(130, 165, 225, 0.24);
  --ink:           #EAEEF6;
  --muted:         #8B95A7;
  --muted-2:       #6B7486;
  --accent:        #4F8BFF;
  --accent-soft:   #A9C6FF;
  --accent-ink:    #06122B;
  --accent-glow:   rgba(79, 139, 255, 0.38);

  /* Type */
  --font-display: 'Space Grotesk', ui-sans-serif, system-ui, sans-serif;
  --font-body:    'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono:    'Space Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  /* Metrics */
  --maxw:      1180px;
  --gutter:    clamp(20px, 5vw, 44px);
  --section-y: clamp(68px, 10vw, 132px);
  --radius:    14px;
  --radius-sm: 9px;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-soft); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--ink);
}

p { margin: 0; }

::selection { background: var(--accent); color: var(--accent-ink); }

:focus-visible {
  outline: 2px solid var(--accent-soft);
  outline-offset: 3px;
  border-radius: 4px;
}

/* --------------------------------------------------------------- helpers */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--section-y); }
.section--tight { padding-block: clamp(48px, 7vw, 84px); }
.section + .section { border-top: 1px solid var(--line); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--accent);
  opacity: 0.7;
}

.lead {
  font-size: clamp(1.06rem, 1.6vw, 1.28rem);
  line-height: 1.6;
  color: var(--muted);
  max-width: 60ch;
}

.mono { font-family: var(--font-mono); }
.muted { color: var(--muted); }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 12px; top: -60px;
  background: var(--accent); color: var(--accent-ink);
  padding: 10px 16px; border-radius: var(--radius-sm);
  font-weight: 600; z-index: 1000;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 12px; color: var(--accent-ink); }

/* --------------------------------------------------------------- buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
  padding: 0.82em 1.35em;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease),
              border-color 0.2s var(--ease), color 0.2s var(--ease);
  white-space: nowrap;
}
.btn .arw { transition: transform 0.2s var(--ease); }
.btn:hover .arw { transform: translateX(3px); }

.btn--accent {
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 8px 30px -12px var(--accent-glow);
}
.btn--accent:hover { background: var(--accent-soft); color: var(--accent-ink); transform: translateY(-1px); }

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--ink); transform: translateY(-1px); }

/* ------------------------------------------------------------- site nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease),
              backdrop-filter 0.3s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-stuck {
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 74px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: 1.06rem;
}
.brand:hover { color: var(--ink); }
.brand__mark { width: 30px; height: 30px; flex: none; color: var(--accent); }
.brand__full { white-space: nowrap; }

.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__links a {
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 7px;
  transition: color 0.18s var(--ease), background 0.18s var(--ease);
}
.nav__links a:hover { color: var(--ink); background: var(--surface-2); }
.nav__links a[aria-current="page"] { color: var(--ink); }
.nav__links a[aria-current="page"]::after {
  content: "";
  display: block;
  height: 2px;
  margin-top: 5px;
  border-radius: 2px;
  background: var(--accent);
}
.nav__right { display: flex; align-items: center; gap: 14px; }

/* CTA that only surfaces inside the mobile menu */
.nav__cta-li { display: none; }

.nav__toggle {
  display: none;
  width: 44px; height: 44px;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--ink);
  align-items: center;
  justify-content: center;
}
.nav__toggle svg { width: 20px; height: 20px; }
.nav__toggle .icon-close { display: none; }
.nav__toggle[aria-expanded="true"] .icon-open { display: none; }
.nav__toggle[aria-expanded="true"] .icon-close { display: block; }

/* -------------------------------------------------- interior page hero */
.page-hero { position: relative; padding-block: clamp(58px, 9vw, 116px) clamp(4px, 2vw, 20px); overflow: hidden; }
.page-hero::before {
  content: "";
  position: absolute; top: -30%; right: -10%;
  width: 520px; height: 520px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 68%);
  opacity: 0.35; pointer-events: none; filter: blur(8px);
}
.page-title { font-size: clamp(2.25rem, 5vw, 3.6rem); margin-top: 18px; max-width: 20ch; }
.page-hero .lead { margin-top: 22px; }

/* --------------------------------------------------------------- hero */
.hero { position: relative; padding-block: clamp(56px, 9vw, 104px); overflow: hidden; }
.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: clamp(32px, 5vw, 64px);
}
.hero__title {
  font-size: clamp(2.5rem, 5.4vw, 4.3rem);
  margin-top: 22px;
  max-width: 15ch;
}
.hero__title .hl { color: var(--accent); }
.hero__lead { margin-top: 22px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 34px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}
.tag {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 100px;
}
.tag::before { content: "‹ "; color: var(--accent); }
.tag::after  { content: " ›"; color: var(--accent); }

/* soft ambient glow behind hero */
.hero::before {
  content: "";
  position: absolute;
  top: -10%; right: -6%;
  width: 620px; height: 620px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 68%);
  opacity: 0.5;
  pointer-events: none;
  filter: blur(8px);
}

/* --------------------------------------------------- hero signature graph */
.graph { width: 100%; height: auto; }
.graph__edge { stroke: var(--line-strong); stroke-width: 1; fill: none; }
.graph__pulse {
  stroke: var(--accent);
  stroke-width: 1.5;
  fill: none;
  stroke-linecap: round;
  stroke-dasharray: 26 300;
  stroke-dashoffset: 326;
  filter: drop-shadow(0 0 4px var(--accent-glow));
  animation: signal 3.4s var(--ease) infinite;
}
.graph__pulse--2 { animation-delay: 0.5s; }
.graph__pulse--3 { animation-delay: 1.0s; }
.graph__pulse--4 { animation-delay: 1.6s; }
.graph__pulse--5 { animation-delay: 2.1s; }
.graph__pulse--6 { animation-delay: 2.7s; }
@keyframes signal { to { stroke-dashoffset: 0; } }

.graph__node { fill: var(--surface); stroke: var(--line-strong); stroke-width: 1.5; }
.graph__node--svc { fill: var(--bg-2); }
.graph__core {
  fill: var(--accent);
  filter: drop-shadow(0 0 16px var(--accent-glow));
}
.graph__ring { fill: none; stroke: var(--accent); stroke-width: 1; opacity: 0.35;
  transform-box: fill-box; transform-origin: center; animation: ring 4s ease-in-out infinite; }
@keyframes ring { 0%,100% { opacity: 0.15; } 50% { opacity: 0.45; } }
.graph__label {
  font-family: var(--font-mono);
  font-size: 12px;
  fill: var(--muted);
  letter-spacing: 0.02em;
}
.graph__core-label { font-family: var(--font-display); font-weight: 700; fill: var(--accent-ink); font-size: 15px; }

@media (prefers-reduced-motion: reduce) {
  .graph__pulse { animation: none; opacity: 0; }
  .graph__ring { animation: none; }
}

/* --------------------------------------------------------- stat strip */
.strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.strip__cell { background: var(--bg); padding: 26px 24px; }
.strip__k { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--accent); }
.strip__v { font-family: var(--font-display); font-weight: 700; font-size: 1.32rem;
  margin-top: 8px; letter-spacing: -0.01em; }
.strip__v small { display: block; font-family: var(--font-body); font-weight: 400;
  font-size: 0.86rem; color: var(--muted); letter-spacing: 0; margin-top: 4px; }

/* ------------------------------------------------------- section heading */
.head { max-width: 62ch; }
.head__title { font-size: clamp(1.9rem, 3.4vw, 2.8rem); margin-top: 16px; }
.head__desc { margin-top: 18px; }
.head--split { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: end; max-width: none; }

/* -------------------------------------------------------------- cards */
.card-grid { display: grid; gap: 18px; margin-top: 46px; }
.card-grid--3 { grid-template-columns: repeat(3, 1fr); }
.card-grid--2 { grid-template-columns: repeat(2, 1fr); }

.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 28px;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease),
              background 0.25s var(--ease);
  overflow: hidden;
}
.card:hover { transform: translateY(-4px); border-color: var(--line-strong); background: #121B2B; }
.card__idx { font-family: var(--font-mono); font-size: 0.74rem; color: var(--muted-2); letter-spacing: 0.1em; }
.card__icon { width: 30px; height: 30px; color: var(--accent); margin-bottom: 18px; }
.card__title { font-size: 1.22rem; }
.card__body { margin-top: 12px; color: var(--muted); font-size: 0.98rem; }
.card__tags { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 6px; }
.card__tag { font-family: var(--font-mono); font-size: 0.7rem; color: var(--muted-2);
  border: 1px solid var(--line); border-radius: 5px; padding: 3px 8px; }
.card--link .card__title::after { content: " →"; color: var(--accent); opacity: 0; transition: opacity 0.2s var(--ease), transform 0.2s; }
.card--link:hover .card__title::after { opacity: 1; }
a.card { color: inherit; }
a.card:hover { color: inherit; }

/* accent top rule that grows on hover */
.card::after {
  content: "";
  position: absolute; left: 0; top: 0; height: 2px; width: 0;
  background: var(--accent);
  transition: width 0.3s var(--ease);
}
.card:hover::after { width: 100%; }

/* ----------------------------------------------------- feature / prose */
.prose { max-width: 68ch; }
.prose p + p { margin-top: 20px; }
.prose p { color: var(--muted); }
.prose strong { color: var(--ink); font-weight: 600; }

.split {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
}

/* detailed service block */
.svc {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: clamp(20px, 4vw, 56px);
  padding-block: 42px;
  border-top: 1px solid var(--line);
}
.svc:first-of-type { border-top: 0; }
.svc__label { font-family: var(--font-mono); font-size: 0.76rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent); padding-top: 6px; }
.svc__title { font-size: clamp(1.5rem, 2.6vw, 2rem); }
.svc__body { margin-top: 14px; color: var(--muted); max-width: 62ch; }
.svc__list { margin: 20px 0 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.svc__list li { font-family: var(--font-mono); font-size: 0.78rem; color: var(--muted);
  border: 1px solid var(--line); border-radius: 6px; padding: 5px 10px; }

/* ------------------------------------------------------- process steps */
.steps { counter-reset: step; margin-top: 46px; display: grid; gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.step { background: var(--bg); padding: 30px 30px; display: grid;
  grid-template-columns: 64px 1fr; gap: 22px; align-items: start; }
.step__n { counter-increment: step; font-family: var(--font-mono); font-weight: 700;
  color: var(--accent); font-size: 1.05rem; }
.step__n::before { content: counter(step, decimal-leading-zero); }
.step__title { font-size: 1.2rem; }
.step__body { margin-top: 8px; color: var(--muted); }

/* ------------------------------------------------------- timeline */
.time { margin-top: 40px; display: grid; gap: 0; }
.time__row { display: grid; grid-template-columns: 120px 1fr; gap: 28px;
  padding: 22px 0; border-top: 1px solid var(--line); }
.time__yr { font-family: var(--font-mono); color: var(--accent); font-size: 0.9rem; letter-spacing: 0.08em; }
.time__txt { color: var(--muted); }
.time__txt strong { color: var(--ink); font-weight: 600; }

/* ------------------------------------------------------- CTA band */
.cta-band {
  position: relative;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: clamp(38px, 6vw, 68px);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(79,139,255,0.14), transparent 60%),
    var(--surface);
  overflow: hidden;
}
.cta-band__title { font-size: clamp(1.8rem, 3.6vw, 2.8rem); max-width: 20ch; }
.cta-band__desc { margin-top: 16px; max-width: 52ch; }
.cta-band__actions { margin-top: 30px; display: flex; flex-wrap: wrap; gap: 14px; }

/* ------------------------------------------------------- forms */
.form { display: grid; gap: 20px; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.field { display: grid; gap: 8px; }
.field label { font-size: 0.86rem; font-weight: 500; color: var(--ink); }
.field .req { color: var(--accent); }
.field input, .field select, .field textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink);
  background: var(--bg-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  padding: 13px 15px;
  transition: border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}
.field textarea { resize: vertical; min-height: 148px; }
.field select { appearance: none; 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'%3E%3Cpath fill='%238B95A7' d='M6 8 0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 15px center; padding-right: 40px; }
.field input::placeholder, .field textarea::placeholder { color: var(--muted-2); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79,139,255,0.16);
}
.field--error input, .field--error select, .field--error textarea { border-color: #ff6b6b; }
.field__err { font-size: 0.8rem; color: #ff8a8a; min-height: 1em; }

.form__note { font-size: 0.84rem; color: var(--muted-2); display: flex; gap: 8px; align-items: flex-start; }
.form__status { font-size: 0.95rem; padding: 14px 16px; border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong); display: none; }
.form__status.is-ok { display: block; border-color: var(--accent); background: rgba(79,139,255,0.08); color: var(--ink); }
.form__status.is-err { display: block; border-color: #ff6b6b; background: rgba(255,107,107,0.08); color: #ffb4b4; }

.contact-grid { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: clamp(32px, 5vw, 64px); align-items: start; }
.info-block { border-top: 1px solid var(--line); padding-top: 18px; margin-top: 26px; }
.info-block:first-child { border-top: 0; margin-top: 0; padding-top: 0; }
.info-block__k { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--accent); }
.info-block__v { margin-top: 8px; color: var(--ink); }
.info-block__v a { color: var(--ink); }
.info-block__v a:hover { color: var(--accent); }

/* ------------------------------------------------------- footer */
.site-footer { border-top: 1px solid var(--line); padding-block: 62px 34px; margin-top: 0; }
.footer__top { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
.footer__brand { max-width: 34ch; }
.footer__tag { color: var(--muted); margin-top: 16px; font-size: 0.95rem; }
.footer__col h4 { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--muted-2); font-weight: 700; }
.footer__col ul { list-style: none; margin: 16px 0 0; padding: 0; display: grid; gap: 10px; }
.footer__col a { color: var(--muted); font-size: 0.95rem; }
.footer__col a:hover { color: var(--ink); }
.footer__bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px;
  margin-top: 52px; padding-top: 26px; border-top: 1px solid var(--line);
  font-size: 0.85rem; color: var(--muted-2); }
.footer__bottom a { color: var(--muted-2); }
.footer__bottom a:hover { color: var(--muted); }

/* ------------------------------------------------------- reveal on scroll */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* =========================================================== responsive */
@media (max-width: 940px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__visual { order: -1; max-width: 440px; }
  .card-grid--3 { grid-template-columns: repeat(2, 1fr); }
  .footer__top { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .nav__links, .nav__right .btn { display: none; }
  .nav__toggle { display: inline-flex; }

  .site-header.is-open .nav__links {
    display: flex;
    position: absolute;
    left: 0; right: 0; top: 74px;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 14px var(--gutter) 22px;
    background: var(--bg-2);
    border-bottom: 1px solid var(--line);
  }
  .site-header.is-open .nav__links a { padding: 13px 12px; font-size: 1.02rem; }
  .site-header.is-open .nav__links a[aria-current="page"]::after { display: none; }
  .site-header.is-open .nav__cta-li { display: block; margin-top: 10px; }
  .site-header.is-open .nav__cta-li .btn { display: inline-flex; width: 100%; justify-content: center; }

  .strip { grid-template-columns: repeat(2, 1fr); }
  .head--split { grid-template-columns: 1fr; }
  .svc { grid-template-columns: 1fr; gap: 12px; }
  .svc__label { padding-top: 0; }
  .step { grid-template-columns: 44px 1fr; padding: 24px 22px; }
  .time__row { grid-template-columns: 84px 1fr; gap: 18px; }
  .form__row { grid-template-columns: 1fr; }
}

@media (max-width: 460px) {
  .card-grid--3, .card-grid--2 { grid-template-columns: 1fr; }
  .strip { grid-template-columns: 1fr; }
  .brand__full { display: none; }
}