/* ============================================================
   ARTUR VAROSYAN — Senior Electrical Engineer
   Design system: dark technical, electric cyan accent
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Sora:wght@300;400;500;600;700;800&family=IBM+Plex+Sans:wght@300;400;500;600;700&display=swap');

:root {
  /* Palette */
  --bg-0: #050811;          /* deepest */
  --bg-1: #0a0f1c;          /* page bg */
  --bg-2: #0f1626;          /* card bg */
  --bg-3: #161f33;          /* elevated */
  --line: #1f2a44;
  --line-2: #2a3756;
  --grid: rgba(82, 224, 255, 0.06);

  --ink-0: #f5f9ff;
  --ink-1: #c7d3ea;
  --ink-2: #8a99b8;
  --ink-3: #56678a;

  --cyan: #52e0ff;          /* primary accent — electric */
  --cyan-glow: #7eecffcc;
  --cyan-deep: #0aa6c6;
  --amber: #ffb547;         /* warning / live */
  --green: #4ade80;         /* energized */
  --red: #ff5b6b;
  --violet: #9d7bff;

  /* Typography */
  --font-display: 'Sora', system-ui, sans-serif;
  --font-body: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Spacing & shape */
  --r-sm: 4px;
  --r: 8px;
  --r-lg: 14px;
  --r-xl: 22px;

  --shadow-glow: 0 0 0 1px rgba(82,224,255,0.18), 0 12px 40px -10px rgba(82,224,255,0.25);
  --shadow-card: 0 1px 0 0 rgba(255,255,255,0.04) inset, 0 30px 60px -30px rgba(0,0,0,0.6);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

html { background: var(--bg-1); }

body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--ink-1);
  background: var(--bg-1);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.55;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Page background — engineering grid + soft glow */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(ellipse at 50% 30%, black 30%, transparent 80%);
}
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(800px 500px at 85% -10%, rgba(82,224,255,0.10), transparent 60%),
    radial-gradient(700px 500px at -10% 80%, rgba(157,123,255,0.06), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* Typography */
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  color: var(--ink-0);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
  text-wrap: balance;
}
h1 { font-size: clamp(2.4rem, 5vw, 4.2rem); line-height: 1.02; font-weight: 800; }
h2 { font-size: clamp(1.8rem, 3.2vw, 2.6rem); line-height: 1.1; }
h3 { font-size: 1.25rem; line-height: 1.25; }
p  { text-wrap: pretty; }

a {
  color: var(--cyan);
  text-decoration: none;
}
a:hover { color: var(--cyan-glow); }

.mono { font-family: var(--font-mono); }
.cap-mono {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.accent { color: var(--cyan); }

/* Layout */
.av-page {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.av-container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 32px;
}
@media (max-width: 720px) {
  .av-container { padding: 0 20px; }
}

.section {
  padding: 96px 0;
  position: relative;
}
.section-tight { padding: 64px 0; }

/* Section header */
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 48px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 20px;
}
.section-head .lead { max-width: 580px; }
.section-head .lead p { color: var(--ink-2); margin: 12px 0 0; font-size: 1.05rem; }
.section-id {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.section-id::before {
  content: '';
  width: 28px;
  height: 1px;
  background: var(--cyan);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border-radius: var(--r);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.18s ease;
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--cyan);
  color: #021019;
  box-shadow: 0 0 0 1px rgba(82,224,255,0.4), 0 10px 30px -8px rgba(82,224,255,0.5);
}
.btn-primary:hover {
  background: var(--cyan-glow);
  color: #021019;
  transform: translateY(-1px);
  box-shadow: 0 0 0 1px rgba(82,224,255,0.6), 0 16px 40px -8px rgba(82,224,255,0.7);
}
.btn-ghost {
  background: transparent;
  color: var(--ink-0);
  border-color: var(--line-2);
}
.btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}
.btn .arrow {
  display: inline-block;
  transition: transform 0.18s;
}
.btn:hover .arrow { transform: translateX(4px); }

/* Cards */
.card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  position: relative;
  overflow: hidden;
}
.card-hover {
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.card-hover:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* Tag pills */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(82,224,255,0.08);
  border: 1px solid rgba(82,224,255,0.25);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.tag-neutral {
  background: rgba(255,255,255,0.03);
  border-color: var(--line-2);
  color: var(--ink-2);
}
.tag-amber {
  background: rgba(255,181,71,0.08);
  border-color: rgba(255,181,71,0.3);
  color: var(--amber);
}

/* Status dot */
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 0 rgba(74,222,128,0.5);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(74,222,128,0.6); }
  70% { box-shadow: 0 0 0 8px rgba(74,222,128,0); }
  100% { box-shadow: 0 0 0 0 rgba(74,222,128,0); }
}

/* ========== NAV ========== */
.av-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(10, 15, 28, 0.7);
  border-bottom: 1px solid var(--line);
}
.av-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 32px;
}
.av-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink-0);
}
.av-brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: linear-gradient(135deg, #0e1c2e 0%, #102237 100%);
  border: 1px solid rgba(82,224,255,0.4);
  display: grid;
  place-items: center;
  position: relative;
  box-shadow: inset 0 0 18px rgba(82,224,255,0.18);
}
.av-brand-mark svg { display: block; }
.av-brand-text { display: flex; flex-direction: column; line-height: 1; }
.av-brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--ink-0);
  letter-spacing: -0.01em;
}
.av-brand-sub {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--cyan);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-top: 4px;
}

.av-nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.av-nav-links a {
  padding: 8px 14px;
  border-radius: 6px;
  color: var(--ink-1);
  font-size: 0.92rem;
  font-weight: 500;
  position: relative;
}
.av-nav-links a:hover { color: var(--ink-0); background: rgba(255,255,255,0.04); }
.av-nav-links a.active {
  color: var(--cyan);
  background: rgba(82,224,255,0.08);
}
.av-nav-cta { display: flex; align-items: center; gap: 12px; }
.av-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-2);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.av-mobile-toggle {
  display: none;
  width: 40px; height: 40px;
  border: 1px solid var(--line-2);
  background: transparent;
  border-radius: 8px;
  color: var(--ink-0);
  cursor: pointer;
}
@media (max-width: 920px) {
  .av-nav-links, .av-status { display: none; }
  .av-mobile-toggle { display: grid; place-items: center; }
}
.av-mobile-menu {
  display: none;
  flex-direction: column;
  border-top: 1px solid var(--line);
  background: rgba(10,15,28,0.96);
}
.av-mobile-menu.open { display: flex; }
.av-mobile-menu a {
  padding: 14px 32px;
  color: var(--ink-1);
  font-weight: 500;
  border-bottom: 1px solid var(--line);
}
.av-mobile-menu a.active { color: var(--cyan); }

/* ========== FOOTER ========== */
.av-footer {
  margin-top: auto;
  border-top: 1px solid var(--line);
  background: var(--bg-0);
  padding: 56px 0 32px;
  position: relative;
  z-index: 1;
}
.av-footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
}
@media (max-width: 800px) {
  .av-footer-grid { grid-template-columns: 1fr 1fr; }
}
.av-footer h4 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin-bottom: 16px;
  font-weight: 500;
}
.av-footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.av-footer ul a { color: var(--ink-1); font-size: 0.92rem; }
.av-footer ul a:hover { color: var(--cyan); }
.av-footer-meta {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Eyebrow stat row */
.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}
@media (max-width: 720px) { .stat-row { grid-template-columns: repeat(2, 1fr); } }
.stat {
  background: var(--bg-2);
  padding: 24px 22px;
}
.stat-num {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--ink-0);
  line-height: 1;
  letter-spacing: -0.02em;
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.stat-suffix { font-size: 1.4rem; color: var(--cyan); font-weight: 600; }
.stat-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin-top: 8px;
}

/* Schematic divider */
.schematic-divider {
  height: 60px;
  position: relative;
  display: flex;
  align-items: center;
  margin: 24px 0;
}
.schematic-divider::before, .schematic-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-2), transparent);
}
.schematic-divider .node {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  margin: 0 16px;
}

/* Animation utilities */
@keyframes flow {
  0% { stroke-dashoffset: 100; }
  100% { stroke-dashoffset: 0; }
}
@keyframes flicker {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}
@keyframes spark {
  0% { transform: translateX(-100%); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateX(100%); opacity: 0; }
}

.fade-up {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.7s ease forwards;
}
@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .fade-up {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
  }
  .dot { animation: none !important; }
}
.fade-up.delay-1 { animation-delay: 0.1s; }
.fade-up.delay-2 { animation-delay: 0.2s; }
.fade-up.delay-3 { animation-delay: 0.3s; }
.fade-up.delay-4 { animation-delay: 0.4s; }

/* Form */
.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.field label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.field input, .field textarea, .field select {
  background: var(--bg-1);
  border: 1px solid var(--line-2);
  color: var(--ink-0);
  padding: 14px 16px;
  border-radius: var(--r);
  font-family: var(--font-body);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.field input:focus, .field textarea:focus, .field select:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(82,224,255,0.15);
}
.field textarea { resize: vertical; min-height: 120px; }

/* Misc */
.scroll-hide::-webkit-scrollbar { display: none; }
.scroll-hide { scrollbar-width: none; }

/* ============================================================
   MOBILE OPTIMIZATION (additive — desktop ≥921px untouched)
   ============================================================ */
html, body { overflow-x: hidden; }
img, svg, video { max-width: 100%; height: auto; }

/* Safe-area for iOS notch / home indicator */
.av-nav { padding-top: env(safe-area-inset-top); }
.av-footer { padding-bottom: calc(32px + env(safe-area-inset-bottom)); }

/* Inputs ≥16px to prevent iOS zoom on focus */
@media (max-width: 720px) {
  input, select, textarea { font-size: 16px !important; }
}

/* ---------- Tablet & small ≤920px ---------- */
@media (max-width: 920px) {
  .av-nav-cta .btn-primary { padding: 9px 14px !important; font-size: .82rem !important; }
}

/* ---------- Phone ≤720px ---------- */
@media (max-width: 720px) {
  .av-nav-inner { height: 60px; gap: 12px; }
  .av-brand-mark { width: 34px; height: 34px; }
  .av-brand-name { font-size: .92rem; }
  .av-brand-sub { font-size: .6rem; }
  .av-mobile-toggle { width: 44px; height: 44px; }

  .section { padding: 64px 0; }
  .section-tight { padding: 48px 0; }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    margin-bottom: 32px;
  }
  .section-head .lead p { font-size: .98rem; }

  /* Mobile menu enhancements */
  .av-mobile-menu {
    padding: 12px 0 18px;
    gap: 0;
  }
  .av-mobile-menu .av-mobile-cta {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 16px 32px 8px;
    border-top: 1px solid var(--line);
    margin-top: 4px;
  }
  .av-mobile-menu .av-mobile-cta .btn { width: 100%; justify-content: center; }
  .av-mobile-menu .av-mobile-cta .av-status { font-size: .68rem; }

  h1 { line-height: 1.1; }
  h2 { font-size: clamp(1.6rem, 6vw, 2.2rem); line-height: 1.15; }
  h3 { font-size: 1.1rem; }
}

/* ---------- Small phone ≤560px ---------- */
@media (max-width: 560px) {
  .av-nav-cta > .btn-primary { display: none; } /* desktop CTA — moved into burger menu */
}

/* ---------- Small phone ≤480px ---------- */
@media (max-width: 480px) {
  .av-container { padding: 0 16px; }
  .section { padding: 48px 0; }
  .section-tight { padding: 36px 0; }
  .av-brand-sub { display: none; }

  .stat { padding: 18px 14px; }
  .stat-num { font-size: 1.7rem; }
  .stat-suffix { font-size: 1.05rem; }
  .stat-label { font-size: .62rem; }

  .btn { padding: 12px 18px; font-size: .9rem; }
}

/* ---------- Footer ≤520px ---------- */
@media (max-width: 520px) {
  .av-footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .av-footer-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    text-align: left;
  }
}