/* ===========================================================
   ArkSphere Technologies — Brand Tokens
   Derived from the logo: deep navy field, cyan→violet network
   gradient, warm gold wordmark accent.
   =========================================================== */
:root {
  --bg: #05070f;
  --bg-soft: #090c1a;
  --surface: #0e1226;
  --surface-2: #141a35;
  --border: rgba(148, 163, 194, 0.14);
  --border-strong: rgba(148, 163, 194, 0.28);

  --cyan: #2dd4e8;
  --cyan-soft: #7fe6f2;
  --violet: #9b5de5;
  --magenta: #c85fe0;
  --gold: #f2a93b;
  --gold-light: #ffd28a;

  --text: #eef1f8;
  --text-muted: #99a3c2;
  --text-faint: #64709a;

  --gradient-brand: linear-gradient(115deg, var(--cyan) 0%, var(--violet) 55%, var(--magenta) 100%);
  --gradient-brand-soft: linear-gradient(115deg, rgba(45,212,232,0.15), rgba(155,93,229,0.15));

  --font-head: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;

  --container: 1180px;
  --radius: 14px;
  --radius-sm: 8px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1em; color: var(--text-muted); }

a { color: inherit; text-decoration: none; }

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

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- background glow ---------- */
.bg-glow {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(680px 420px at 12% -5%, rgba(45,212,232,0.16), transparent 60%),
    radial-gradient(760px 480px at 100% 10%, rgba(155,93,229,0.14), transparent 60%),
    radial-gradient(600px 400px at 50% 100%, rgba(200,95,224,0.10), transparent 60%),
    var(--bg);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.94rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--gradient-brand);
  color: #06070f;
  box-shadow: 0 8px 24px -8px rgba(155, 93, 229, 0.55);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px -8px rgba(155, 93, 229, 0.7); }

.btn-outline {
  border-color: var(--border-strong);
  color: var(--text);
  background: rgba(255,255,255,0.02);
}
.btn-outline:hover { border-color: var(--cyan-soft); color: var(--cyan-soft); }

.btn-ghost {
  border-color: var(--border);
  color: var(--text);
  padding: 10px 20px;
  font-size: 0.88rem;
}
.btn-ghost:hover { border-color: var(--gold); color: var(--gold-light); }

/* ---------- eyebrow ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-head);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cyan-soft);
  margin-bottom: 18px;
}
.eyebrow .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 10px 2px rgba(242,169,59,0.6);
}
.eyebrow-alt { color: var(--violet); }
.eyebrow-alt .dot { background: var(--cyan); box-shadow: 0 0 10px 2px rgba(45,212,232,0.55); }

/* ===========================================================
   HEADER
   =========================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(5, 7, 15, 0.72);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 16px 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
}
.brand-logo { height: 36px; width: auto; }
.brand-mark { display: flex; align-items: center; }
.brand-text {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}
.brand-text em {
  display: block;
  font-style: normal;
  font-weight: 500;
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin-top: 1px;
}

.main-nav { display: flex; gap: 32px; }
.main-nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s ease;
  position: relative;
}
.main-nav a:hover { color: var(--text); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

/* ===========================================================
   HERO
   =========================================================== */
.hero {
  position: relative;
  padding: 120px 0 100px;
  overflow: hidden;
  min-height: 640px;
  display: flex;
  align-items: center;
}
#network-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.85;
}
.hero-fade {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 160px;
  background: linear-gradient(to bottom, transparent, var(--bg));
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 760px;
}
.hero h1 {
  font-size: clamp(2.3rem, 5.2vw, 3.6rem);
  background: linear-gradient(100deg, #fff 30%, var(--cyan-soft) 65%, var(--violet) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  font-size: 1.12rem;
  max-width: 560px;
  color: var(--text-muted);
}
.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 32px;
  flex-wrap: wrap;
}

/* ===========================================================
   SERVICES
   =========================================================== */
.services { padding: 120px 0 60px; position: relative; }
.section-head { max-width: 640px; margin-bottom: 64px; }
.section-head h2 { font-size: clamp(1.8rem, 3.4vw, 2.5rem); }
.section-lead { font-size: 1.05rem; }

.service-list {
  display: flex;
  flex-direction: column;
  position: relative;
}
.service-row {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 32px;
  position: relative;
  padding-bottom: 56px;
}
.service-row:last-child { padding-bottom: 0; }

.service-node {
  display: flex;
  justify-content: center;
  position: relative;
}
.service-node::before {
  content: '';
  position: absolute;
  top: 44px;
  bottom: -56px;
  width: 1px;
  background: linear-gradient(to bottom, var(--border-strong), transparent);
}
.service-row:last-child .service-node::before { display: none; }
.node-index {
  width: 44px; height: 44px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--bg);
  background: var(--gradient-brand);
  box-shadow: 0 0 0 4px var(--bg), 0 0 0 5px var(--border-strong), 0 8px 20px -6px rgba(155,93,229,0.6);
  z-index: 1;
}

.service-body {
  background: linear-gradient(180deg, var(--surface), var(--bg-soft));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.service-row:hover .service-body {
  border-color: var(--border-strong);
  transform: translateX(4px);
}
.service-icon { margin-bottom: 16px; }
.service-icon svg { width: 38px; height: 38px; }
.service-body h3 {
  font-size: 1.3rem;
  color: var(--text);
  margin-bottom: 10px;
}
.service-body p { max-width: 640px; }
.service-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0;
  margin: 16px 0 0;
}
.service-tags li {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(45, 212, 232, 0.07);
  border: 1px solid rgba(45, 212, 232, 0.18);
  color: var(--cyan-soft);
}

/* ===========================================================
   ABOUT
   =========================================================== */
.about { padding: 130px 0; position: relative; }
.about-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: center;
}
.about-copy h2 { font-size: clamp(1.8rem, 3.2vw, 2.4rem); color: var(--text); }
.about-copy > p { max-width: 560px; }

.pillars { margin-top: 36px; display: flex; flex-direction: column; gap: 22px; }
.pillar { display: flex; gap: 16px; align-items: flex-start; }
.pillar-icon {
  flex-shrink: 0;
  width: 34px; height: 34px;
  border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  background: var(--gradient-brand-soft);
  border: 1px solid var(--border-strong);
  color: var(--gold-light);
  font-size: 1rem;
}
.pillar h4 { font-size: 1rem; color: var(--text); margin-bottom: 4px; }
.pillar p { margin: 0; font-size: 0.92rem; }

.about-visual { display: flex; justify-content: center; align-items: center; }
.sphere {
  position: relative;
  width: 320px; height: 320px;
}
.ring {
  position: absolute; inset: 0;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
}
.ring-1 { animation: spin 22s linear infinite; border-color: rgba(45,212,232,0.35); }
.ring-2 {
  inset: 34px;
  transform: rotate(35deg);
  animation: spin 16s linear infinite reverse;
  border-color: rgba(155,93,229,0.35);
}
.ring-3 {
  inset: 68px;
  transform: rotate(-20deg);
  animation: spin 28s linear infinite;
  border-color: rgba(200,95,224,0.3);
}
.core {
  position: absolute;
  inset: 118px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, rgba(255,255,255,0.9), var(--violet) 45%, transparent 75%);
  box-shadow: 0 0 60px 10px rgba(155,93,229,0.35);
}
.spark {
  position: absolute;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 12px 3px rgba(242,169,59,0.7);
}
.spark-1 { top: 10%; left: 48%; animation: orbit1 22s linear infinite; }
.spark-2 { top: 48%; left: 4%; animation: orbit2 16s linear infinite reverse; }
.spark-3 { top: 82%; left: 62%; animation: orbit3 28s linear infinite; }
.spark-4 { top: 30%; left: 88%; width: 6px; height: 6px; animation: orbit1 19s linear infinite reverse; }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes orbit1 { from { transform: rotate(0deg) translateX(160px) rotate(0deg); } to { transform: rotate(360deg) translateX(160px) rotate(-360deg); } }
@keyframes orbit2 { from { transform: rotate(0deg) translateX(124px) rotate(0deg); } to { transform: rotate(360deg) translateX(124px) rotate(-360deg); } }
@keyframes orbit3 { from { transform: rotate(0deg) translateX(90px) rotate(0deg); } to { transform: rotate(360deg) translateX(90px) rotate(-360deg); } }

/* ===========================================================
   CONTACT
   =========================================================== */
.contact { padding: 60px 0 140px; }
.contact-inner {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
  background: linear-gradient(160deg, var(--surface), var(--bg-soft));
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 56px;
  position: relative;
  overflow: hidden;
}
.contact-inner::before {
  content: '';
  position: absolute;
  top: -120px; right: -120px;
  width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(45,212,232,0.18), transparent 70%);
  pointer-events: none;
}
.contact-copy h2 { font-size: clamp(1.7rem, 3vw, 2.2rem); color: var(--text); }
.contact-details { margin-top: 32px; display: flex; flex-direction: column; gap: 18px; }
.contact-details a { color: var(--cyan-soft); font-weight: 600; }
.contact-details a:hover { color: var(--gold-light); }
.detail-label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  margin-bottom: 4px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
  position: relative;
  z-index: 1;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.contact-form label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}
.contact-form label.full { grid-column: 1 / -1; }
.contact-form input,
.contact-form select,
.contact-form textarea {
  background: var(--bg-soft);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  resize: vertical;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(45, 212, 232, 0.15);
}
.contact-form select { appearance: none; }
.form-submit { margin-top: 6px; align-self: flex-start; }
.form-note {
  font-size: 0.88rem;
  min-height: 1.2em;
  color: var(--cyan-soft);
}
.form-note.error { color: #f28b8b; }

/* ===========================================================
   FOOTER
   =========================================================== */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding-top: 56px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 32px;
  padding-bottom: 40px;
}
.footer-logo { height: 96px; width: auto; border-radius: 10px; }
.footer-brand p { max-width: 320px; margin-top: 14px; font-size: 0.9rem; }
.footer-nav { display: flex; gap: 28px; }
.footer-nav a { color: var(--text-muted); font-size: 0.9rem; }
.footer-nav a:hover { color: var(--cyan-soft); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 24px;
}
.footer-bottom p { margin: 0; font-size: 0.8rem; color: var(--text-faint); }

/* ===========================================================
   RESPONSIVE
   =========================================================== */
@media (max-width: 900px) {
  .about-inner { grid-template-columns: 1fr; }
  .about-visual { order: -1; margin-bottom: 24px; }
  .sphere { width: 240px; height: 240px; }
  .contact-inner { grid-template-columns: 1fr; padding: 36px 28px; }
}

@media (max-width: 720px) {
  .main-nav {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    background: rgba(9, 12, 26, 0.98);
    border-bottom: 1px solid var(--border);
    padding: 20px 24px;
    gap: 18px;
    display: none;
  }
  .main-nav.open { display: flex; }
  .nav-toggle { display: flex; }
  .nav-cta { display: none; }
  .form-row { grid-template-columns: 1fr; }
  .service-row { grid-template-columns: 44px 1fr; gap: 18px; }
  .hero { padding: 100px 0 80px; min-height: 520px; }
}

@media (max-width: 480px) {
  .header-inner { padding: 14px 18px; }
  .container { padding: 0 18px; }
}