/* =============================================================
   NR Simulator — Landing page
   Mirrors the app's "command center" dark theme (src/assets/theme.css)
   ============================================================= */

:root {
  /* Surfaces */
  --bg-900: #0d1117;
  --bg-800: #131a24;
  --bg-700: #1a2332;
  --bg-600: #222d3d;
  --bg-500: #2b3850;

  /* Borders */
  --border-fine: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.12);
  --border-strong: rgba(255, 255, 255, 0.2);

  /* Text */
  --text: #e6edf3;
  --text-dim: #97a3b6;
  --text-muted: #61708a;

  /* Accents */
  --amber: #e8a33d;
  --amber-hover: #f2b455;
  --amber-soft: rgba(232, 163, 61, 0.14);
  --cyan: #38bdf8;
  --cyan-soft: rgba(56, 189, 248, 0.14);
  --success: #3fb950;
  --danger: #f85149;
  --on-primary: #1a1205;

  /* Type */
  --font-sans: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, Menlo, Consolas, monospace;
  --font-display: 'Chakra Petch', 'Inter', sans-serif;

  /* Radii / shadow */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 6px 18px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.55);
  --glow-amber: 0 0 0 1px rgba(232, 163, 61, 0.35), 0 8px 30px rgba(232, 163, 61, 0.22);

  --t: 0.18s ease;
  --t-fast: 0.12s ease;

  /* Command-center backdrop */
  --gradient-command:
    radial-gradient(1200px 600px at 50% -10%, rgba(232, 163, 61, 0.1), transparent 60%),
    radial-gradient(900px 500px at 85% 110%, rgba(56, 189, 248, 0.07), transparent 55%),
    var(--bg-900);

  --maxw: 1140px;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--gradient-command);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a {
  color: inherit;
  text-decoration: none;
}
img,
svg {
  display: block;
}
ul,
ol {
  list-style: none;
  padding: 0;
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--bg-500) transparent;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(1.1rem, 4vw, 2.5rem);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 200;
  background: var(--amber);
  color: var(--on-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* ---------- Shared type devices ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--amber);
}
.eyebrow--cyan {
  color: var(--cyan);
}
.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px var(--amber-soft);
  animation: pulse 2.4s ease-in-out infinite;
}
.dot--cyan {
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-soft);
}
@keyframes pulse {
  50% {
    opacity: 0.45;
  }
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.01em;
}
.accent {
  color: var(--amber);
}
.stat {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}
code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--bg-800);
  border: 1px solid var(--border-fine);
  padding: 0.05em 0.4em;
  border-radius: var(--radius-sm);
  color: var(--cyan);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.55rem 1.1rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1;
  color: var(--text);
  background: var(--bg-600);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--t), border-color var(--t), color var(--t), transform var(--t-fast),
    box-shadow var(--t);
  white-space: nowrap;
}
.btn:hover {
  background: var(--bg-500);
  border-color: var(--border-strong);
}
.btn:active {
  transform: translateY(1px);
}
.btn:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}
.btn--primary {
  background: var(--amber);
  border-color: transparent;
  color: var(--on-primary);
}
.btn--primary:hover {
  background: var(--amber-hover);
  box-shadow: var(--glow-amber);
}
.btn--ghost {
  background: transparent;
  border-color: var(--border);
}
.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--border-strong);
}
.btn--lg {
  padding: 0.8rem 1.4rem;
  font-size: 0.98rem;
}
.btn--block {
  width: 100%;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-fine);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
}
.brand-mark {
  color: var(--amber);
  display: inline-flex;
}
.brand-text {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 1.02rem;
  text-transform: uppercase;
}
.nav {
  display: flex;
  gap: 1.6rem;
  margin-left: auto;
}
.nav a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-dim);
  transition: color var(--t);
}
.nav a:hover {
  color: var(--text);
}
.header-cta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 40px;
  height: 36px;
  padding: 9px 8px;
  background: var(--bg-600);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.nav-toggle span {
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--t), opacity var(--t);
}
.mobile-nav[hidden] {
  display: none;
}
.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0.75rem clamp(1.1rem, 4vw, 2.5rem) 1.1rem;
  border-top: 1px solid var(--border-fine);
}
.mobile-nav a {
  padding: 0.65rem 0.5rem;
  font-size: 0.95rem;
  color: var(--text-dim);
  border-radius: var(--radius-sm);
}
.mobile-nav a.btn {
  color: var(--on-primary);
  margin-top: 0.35rem;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: clamp(3.5rem, 8vw, 6rem) 0 clamp(3rem, 6vw, 5rem);
  overflow: hidden;
}
.grid-bg {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 35%, transparent 78%);
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 35%, transparent 78%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.hero-copy h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  margin: 1.1rem 0 1.2rem;
}
.lede {
  color: var(--text-dim);
  font-size: 1.08rem;
  max-width: 36ch;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 1.8rem 0 2.2rem;
}
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.6rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--border-fine);
}
.hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.stat-num {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text);
}
.stat-lbl {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Hero plot (signature) */
.plot {
  position: relative;
}
.plot-frame {
  background: linear-gradient(160deg, var(--bg-600), var(--bg-700));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 0.85rem;
  position: relative;
}
.plot-frame::before {
  /* corner ticks, HUD feel */
  content: '';
  position: absolute;
  inset: 0.45rem;
  border: 1px solid var(--border-fine);
  border-radius: var(--radius);
  pointer-events: none;
}
.plot-hud {
  display: flex;
  justify-content: space-between;
  padding: 0 0.3rem 0.55rem;
}
.hud-tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.hud-tag--live {
  color: var(--success);
}
.hud-tag--live .dot {
  width: 6px;
  height: 6px;
  background: var(--success);
  box-shadow: 0 0 0 3px rgba(63, 185, 80, 0.18);
}
.plot-svg {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  background: var(--bg-900);
  border: 1px solid var(--border-fine);
}
.plot-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
}
.plot-measure {
  font-family: var(--mono);
  font-size: 11px;
  fill: var(--text);
}
.plot-foot {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  padding: 0.6rem 0.3rem 0.1rem;
}
.plot-foot .stat {
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  background: var(--bg-800);
  border: 1px solid var(--border-fine);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}
.plot-foot--ok {
  color: var(--success) !important;
  border-color: rgba(63, 185, 80, 0.3) !important;
}

/* plot motion */
.los-cone {
  transform-box: fill-box;
  transform-origin: 0% 100%;
  animation: sweep 6s ease-in-out infinite;
}
.los-ray {
  animation: dash 6s ease-in-out infinite;
}
@keyframes sweep {
  0%,
  100% {
    transform: rotate(0deg);
  }
  50% {
    transform: rotate(-6deg);
  }
}
@keyframes dash {
  50% {
    transform: rotate(-6deg);
    transform-box: fill-box;
    transform-origin: 0% 100%;
  }
}
.scanline {
  animation: scan 4.5s linear infinite;
}
@keyframes scan {
  0% {
    transform: translateY(8px);
    opacity: 0;
  }
  12% {
    opacity: 1;
  }
  88% {
    opacity: 1;
  }
  100% {
    transform: translateY(312px);
    opacity: 0;
  }
}

/* ---------- Systems strip ---------- */
.systems {
  border-block: 1px solid var(--border-fine);
  background: rgba(19, 26, 36, 0.5);
}
.systems-inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.9rem 1.8rem;
  padding-block: 1.1rem;
}
.systems-label {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.systems-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.8rem;
}
.systems-list li {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0.03em;
  color: var(--text-dim);
}
.systems-list li:last-child {
  color: var(--text-muted);
}

/* ---------- Section heads ---------- */
.section-head {
  max-width: 52ch;
  margin-bottom: 2.6rem;
}
.section-head--center {
  margin-inline: auto;
  text-align: center;
}
.section-head h2,
.final-cta h2,
.download h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin: 0.9rem 0 0.7rem;
}
.section-sub {
  color: var(--text-dim);
  font-size: 1.02rem;
}

/* ---------- Features ---------- */
.features {
  padding: clamp(4rem, 8vw, 6rem) 0;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.feature {
  position: relative;
  background: linear-gradient(160deg, var(--bg-600), var(--bg-700));
  border: 1px solid var(--border-fine);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.5rem 1.5rem;
}
.card-interactive {
  transition: border-color var(--t), box-shadow var(--t), transform var(--t-fast);
}
.card-interactive:hover {
  border-color: var(--amber);
  box-shadow: var(--glow-amber);
  transform: translateY(-3px);
}
.feature-no {
  position: absolute;
  top: 1.2rem;
  right: 1.3rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}
.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: var(--radius);
  color: var(--amber);
  background: var(--amber-soft);
  border: 1px solid rgba(232, 163, 61, 0.25);
  margin-bottom: 1.1rem;
}
.feature h3 {
  font-size: 1.18rem;
  margin-bottom: 0.45rem;
}
.feature p {
  color: var(--text-dim);
  font-size: 0.95rem;
}

/* ---------- 3D models / steps ---------- */
.models {
  position: relative;
  padding: clamp(4rem, 8vw, 6rem) 0;
  border-block: 1px solid var(--border-fine);
  overflow: hidden;
}
.grid-bg--soft {
  -webkit-mask-image: radial-gradient(110% 80% at 50% 50%, #000 10%, transparent 70%);
  mask-image: radial-gradient(110% 80% at 50% 50%, #000 10%, transparent 70%);
  opacity: 0.6;
}
.models .wrap {
  position: relative;
}
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  counter-reset: step;
}
.step {
  position: relative;
  background: linear-gradient(160deg, var(--bg-600), var(--bg-700));
  border: 1px solid var(--border-fine);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.4rem;
}
/* connecting line between steps on wide screens */
.step:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 2.35rem;
  right: -0.6rem;
  width: 1.2rem;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}
.step-tag {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.step-no {
  font-family: var(--mono);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--cyan);
  line-height: 1;
}
.step-kind {
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  background: var(--cyan-soft);
  color: var(--cyan);
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
}
.step h3 {
  font-size: 1.08rem;
  margin-bottom: 0.45rem;
}
.step p {
  color: var(--text-dim);
  font-size: 0.92rem;
}
.models-cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.8rem;
  margin-top: 2.4rem;
}

/* ---------- Download ---------- */
.download {
  padding: clamp(4rem, 8vw, 6rem) 0;
}
.download-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.legal {
  display: flex;
  gap: 0.7rem;
  margin-top: 1.5rem;
  padding: 0.9rem 1rem;
  background: var(--amber-soft);
  border: 1px solid rgba(232, 163, 61, 0.25);
  border-radius: var(--radius);
  font-size: 0.84rem;
  color: var(--text-dim);
}
.legal svg {
  flex-shrink: 0;
  color: var(--amber);
  margin-top: 2px;
}
.download-cards {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
.dl-card {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  padding: 1.2rem 1.3rem;
  background: linear-gradient(160deg, var(--bg-600), var(--bg-700));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.dl-os {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  flex-shrink: 0;
  border-radius: var(--radius);
  background: var(--bg-800);
  border: 1px solid var(--border-fine);
  color: var(--text);
}
.dl-body {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  flex: 1;
  min-width: 0;
}
.dl-kicker {
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--amber);
}
.dl-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.08rem;
}
.dl-file {
  font-size: 0.78rem;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.dl-note {
  margin-top: 0.25rem;
  font-size: 0.7rem;
  line-height: 1.35;
  color: var(--text-dim);
}
.dl-note code {
  font-family: var(--mono);
  color: var(--amber);
}
.dl-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--text-dim);
  transition: background var(--t), color var(--t), transform var(--t-fast);
}
.dl-card:hover .dl-arrow {
  background: var(--amber);
  color: var(--on-primary);
  transform: translateY(2px);
  border-color: transparent;
}

/* ---------- Final CTA ---------- */
.final-cta {
  padding: 0 0 clamp(4rem, 8vw, 6rem);
}
.final-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: clamp(2rem, 4vw, 3rem) clamp(1.5rem, 4vw, 3rem);
  background: linear-gradient(135deg, var(--bg-700), var(--bg-800));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.final-inner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(600px 200px at 100% 0%, var(--amber-soft), transparent 70%);
  pointer-events: none;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border-fine);
  background: rgba(13, 17, 23, 0.6);
  padding-top: 2.5rem;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding-bottom: 2rem;
}
.footer-brand {
  max-width: 32ch;
}
.footer-brand p {
  margin-top: 0.6rem;
  color: var(--text-muted);
  font-size: 0.88rem;
}
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.6rem;
  align-content: flex-start;
}
.footer-nav a {
  font-size: 0.88rem;
  color: var(--text-dim);
  transition: color var(--t);
}
.footer-nav a:hover {
  color: var(--amber);
}
.footer-base {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.8rem;
  padding-block: 1.2rem 1.6rem;
  border-top: 1px solid var(--border-fine);
}
.footer-base .stat {
  font-size: 0.78rem;
  color: var(--text-muted);
}
.footer-note {
  font-size: 0.76rem;
  color: var(--text-muted);
  max-width: 60ch;
}

/* ---------- Responsive ---------- */
@media (max-width: 920px) {
  .hero-inner,
  .download-inner {
    grid-template-columns: 1fr;
  }
  .plot {
    order: -1;
    max-width: 480px;
  }
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .step:not(:last-child)::after {
    display: none;
  }
}

@media (max-width: 720px) {
  .nav,
  .header-cta .btn {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .nav-toggle[aria-expanded='true'] span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }
  .nav-toggle[aria-expanded='true'] span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle[aria-expanded='true'] span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
}

@media (max-width: 560px) {
  .feature-grid,
  .steps {
    grid-template-columns: 1fr;
  }
  .hero-stats {
    gap: 1.1rem 1.6rem;
  }
  .final-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}