/* ─── Reset & Base ─────────────────────────────────────────────── */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Phosphor palette */
  --green: #00ff41;
  --green-dim: #00cc34;
  --green-dark: #003d0f;
  --green-glow: rgba(0, 255, 65, 0.15);
  --amber: #ff8c00;
  --amber-dim: #cc7000;
  --amber-glow: rgba(255, 140, 0, 0.12);
  --blue: #0088ff;
  --blue-dim: #006bcc;
  --red: #ff2040;

  /* Surface */
  --bg: #060a06;
  --bg-panel: #0a0f0a;
  --bg-card: #0d120d;
  --bg-card-hover: #111811;
  --border: #1a2e1a;
  --border-bright: #2a4a2a;
  --text: #c8e6c8;
  --text-dim: #5a7a5a;
  --text-bright: #e0ffe0;

  /* Typography */
  --font-display: 'Chakra Petch', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scrollbar-color: var(--green-dark) var(--bg);
}

body {
  font-family: var(--font-mono);
  font-weight: 300;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ─── Overlays ─────────────────────────────────────────────────── */

.scanlines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.08) 2px,
    rgba(0, 0, 0, 0.08) 4px
  );
}

.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9998;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px;
}

/* ─── Top Bar ──────────────────────────────────────────────────── */

.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-lg);
  background: rgba(6, 10, 6, 0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.top-bar__left,
.top-bar__center,
.top-bar__right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.top-bar__tag {
  color: var(--green);
  font-weight: 500;
}

.top-bar__divider {
  width: 1px;
  height: 12px;
  background: var(--border-bright);
}

.top-bar__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--red);
  animation: pulse-dot 1.5s ease-in-out infinite;
}

.blink {
  color: var(--red);
  animation: blink 1.5s step-end infinite;
}

.top-bar__coord {
  font-variant-numeric: tabular-nums;
}

/* ─── Hero ─────────────────────────────────────────────────────── */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 100vh;
  padding: calc(var(--space-2xl) + 40px) var(--space-xl) var(--space-2xl);
  gap: var(--space-xl);
  overflow: hidden;
}

.hero__grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.3;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
}

.hero__topo {
  position: absolute;
  inset: 0;
  opacity: 0.06;
  background-image:
    radial-gradient(ellipse 600px 400px at 30% 60%, var(--green) 0%, transparent 50%),
    radial-gradient(ellipse 400px 300px at 70% 40%, var(--amber) 0%, transparent 50%);
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 560px;
  animation: fadeSlideUp 0.8s ease-out both;
}

.hero__badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  margin-bottom: var(--space-lg);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--green);
  border: 1px solid var(--green-dark);
  background: rgba(0, 255, 65, 0.04);
}

.hero__title {
  margin-bottom: var(--space-lg);
}

.hero__title-main {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 7vw, 6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 0.95;
  color: var(--green);
  text-shadow: 0 0 40px var(--green-glow), 0 0 80px rgba(0, 255, 65, 0.08);
}

.hero__title-sub {
  display: block;
  margin-top: var(--space-sm);
  font-family: var(--font-display);
  font-size: clamp(0.85rem, 1.8vw, 1.1rem);
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.hero__desc {
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--text);
  margin-bottom: var(--space-xl);
}

.hero__stats {
  display: flex;
  gap: var(--space-xl);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.stat__value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-bright);
  line-height: 1;
}

.stat__label {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
}

/* Radar */

.hero__radar {
  position: relative;
  z-index: 2;
  flex-shrink: 0;
  animation: fadeSlideUp 0.8s 0.3s ease-out both;
}

#radar {
  display: block;
  filter: drop-shadow(0 0 30px rgba(0, 255, 65, 0.1));
}

.radar-label {
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text-dim);
  white-space: nowrap;
}

/* ─── Section Header ───────────────────────────────────────────── */

.section-header {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.section-header__line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-bright), transparent);
}

.section-header__title {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--text-dim);
  white-space: nowrap;
}

/* ─── Signals Section ──────────────────────────────────────────── */

.signals {
  position: relative;
  padding: var(--space-2xl) var(--space-xl);
}

.signals__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.sig-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: border-color 0.3s, background 0.3s;
}

.sig-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--green-dark);
  transition: background 0.3s;
}

.sig-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-bright);
}

.sig-card:hover::before {
  background: var(--green);
  box-shadow: 0 0 20px var(--green-glow);
}

.sig-card[data-type="cell"]:hover::before  { background: var(--amber); box-shadow: 0 0 20px var(--amber-glow); }
.sig-card[data-type="wifi"]:hover::before  { background: var(--green); }
.sig-card[data-type="ble"]:hover::before   { background: var(--blue); box-shadow: 0 0 20px rgba(0, 136, 255, 0.15); }
.sig-card[data-type="mesh"]:hover::before  { background: var(--amber); box-shadow: 0 0 20px var(--amber-glow); }
.sig-card[data-type="aprs"]:hover::before  { background: var(--red); box-shadow: 0 0 20px rgba(255, 32, 64, 0.15); }
.sig-card[data-type="adsb"]:hover::before  { background: var(--blue); box-shadow: 0 0 20px rgba(0, 136, 255, 0.15); }
.sig-card[data-type="fmrds"]:hover::before { background: var(--green); box-shadow: 0 0 20px var(--green-glow); }
.sig-card[data-type="orbcomm"]:hover::before { background: var(--amber); box-shadow: 0 0 20px var(--amber-glow); }

.sig-card[data-type="cell"]:hover    { --card-accent: var(--amber); }
.sig-card[data-type="wifi"]:hover    { --card-accent: var(--green); }
.sig-card[data-type="ble"]:hover     { --card-accent: var(--blue); }
.sig-card[data-type="mesh"]:hover    { --card-accent: var(--amber); }
.sig-card[data-type="aprs"]:hover    { --card-accent: var(--red); }
.sig-card[data-type="adsb"]:hover    { --card-accent: var(--blue); }
.sig-card[data-type="fmrds"]:hover   { --card-accent: var(--green); }
.sig-card[data-type="orbcomm"]:hover { --card-accent: var(--amber); }

.sig-card--wide {
}

.sig-card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-md);
  color: var(--text-dim);
  transition: color 0.3s;
}

.sig-card:hover .sig-card__icon {
  color: var(--card-accent, var(--green));
}

.sig-card__name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: var(--space-xs);
}

.sig-card__band {
  display: inline-block;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: var(--space-md);
}

.sig-card__desc {
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--text);
  flex: 1;
}

.sig-card__meta {
  display: flex;
  gap: var(--space-lg);
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--text-dim);
}

/* Signal wave animation on card */
.sig-card__signal {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40px;
  overflow: hidden;
  opacity: 0;
  transition: opacity 0.4s;
}

.sig-card:hover .sig-card__signal {
  opacity: 0.12;
}

.sig-wave {
  position: absolute;
  bottom: -20px;
  left: -10%;
  width: 120%;
  height: 40px;
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent 8px,
    var(--card-accent, var(--green)) 8px,
    var(--card-accent, var(--green)) 9px
  );
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 40'%3E%3Cpath d='M0 20 Q25 0 50 20 T100 20 T150 20 T200 20' fill='none' stroke='white' stroke-width='30'/%3E%3C/svg%3E");
  mask-size: 200px 40px;
  mask-repeat: repeat-x;
  animation: waveScroll 3s linear infinite;
}

.sig-wave:nth-child(2) {
  opacity: 0.5;
  animation-duration: 2.5s;
  animation-direction: reverse;
  bottom: -15px;
}

.sig-wave:nth-child(3) {
  opacity: 0.3;
  animation-duration: 4s;
  bottom: -25px;
}

/* ─── Method Section ───────────────────────────────────────────── */

.method {
  padding: var(--space-2xl) var(--space-xl);
}

.method__flow {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: var(--space-lg);
}

.method__step {
  position: relative;
  flex: 1;
  max-width: 320px;
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: border-color 0.3s;
}

.method__step:hover {
  border-color: var(--border-bright);
}

.method__step-num {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--green-dark);
  line-height: 1;
  margin-bottom: var(--space-sm);
  transition: color 0.3s;
}

.method__step:hover .method__step-num {
  color: var(--green);
  text-shadow: 0 0 20px var(--green-glow);
}

.method__step h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.method__step p {
  font-size: 0.8rem;
  color: var(--text);
  line-height: 1.7;
}

.method__connector {
  flex-shrink: 0;
  width: 64px;
  margin-top: 48px;
  color: var(--green-dark);
}

.method__connector svg {
  width: 100%;
  height: auto;
}

/* ─── Specs Section ────────────────────────────────────────────── */

.specs {
  padding: var(--space-2xl) var(--space-xl);
}

.specs__table {
  max-width: 720px;
  margin: 0 auto;
  border: 1px solid var(--border);
}

.specs__row {
  display: flex;
  border-bottom: 1px solid var(--border);
  transition: background 0.2s;
}

.specs__row:last-child {
  border-bottom: none;
}

.specs__row:hover {
  background: var(--bg-card);
}

.specs__key {
  flex: 0 0 220px;
  padding: var(--space-md) var(--space-lg);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  border-right: 1px solid var(--border);
}

.specs__val {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  font-size: 0.8rem;
  color: var(--text);
}

/* ─── Download Section ─────────────────────────────────────────── */

.download {
  padding: var(--space-2xl) var(--space-xl);
}

.download__inner {
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.download__icon {
  width: 48px;
  height: 48px;
  color: var(--green-dim);
}

.download__text {
  font-size: 0.85rem;
  color: var(--text);
  line-height: 1.7;
}

.download__btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 2rem;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--bg);
  background: var(--green);
  border: 1px solid var(--green);
  transition: background 0.25s, color 0.25s, box-shadow 0.25s;
}

.download__btn:hover {
  background: transparent;
  color: var(--green);
  box-shadow: 0 0 20px var(--green-glow), inset 0 0 20px rgba(0, 255, 65, 0.06);
}

.download__btn-icon {
  width: 18px;
  height: 18px;
  display: flex;
}

.download__btn-icon svg {
  width: 100%;
  height: 100%;
}

/* ─── About Section ────────────────────────────────────────────── */

.about {
  padding: var(--space-2xl) var(--space-xl);
}

.about__inner {
  max-width: 620px;
  margin: 0 auto;
  text-align: center;
}

.about__inner > p {
  font-size: 0.85rem;
  color: var(--text);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.about__dp {
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.about__dp-link {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid var(--green-dark);
  padding-bottom: 1px;
  transition: border-color 0.25s;
}

.about__dp-link:hover {
  border-color: var(--green);
}

.about__contact {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
}

.about__contact-label {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.about__email {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid var(--green-dark);
  padding-bottom: 1px;
  transition: border-color 0.25s;
}

.about__email:hover {
  border-color: var(--green);
}

/* ─── Footer ───────────────────────────────────────────────────── */

.footer {
  padding: var(--space-xl) var(--space-xl) var(--space-lg);
  border-top: 1px solid var(--border);
}

.footer__inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.footer__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--green);
  letter-spacing: -0.02em;
  text-shadow: 0 0 30px var(--green-glow);
  margin-bottom: var(--space-sm);
}

.footer__tagline {
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

.footer__border {
  width: 60px;
  height: 1px;
  margin: var(--space-lg) auto;
  background: var(--border-bright);
}

.footer__attribution {
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-bottom: var(--space-lg);
}

.footer__attribution p {
  margin: 0 0 0.5em 0;
}

.footer__attribution p:last-child {
  margin-bottom: 0;
}

.footer__attribution a {
  color: var(--text-dim);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.footer__attribution a:hover {
  color: var(--text);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.footer__status {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.footer__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  animation: pulse-dot 2s ease-in-out infinite;
}

/* ─── Animations ───────────────────────────────────────────────── */

@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

@keyframes waveScroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-200px); }
}

/* Scroll-triggered reveal */
.sig-card,
.method__step,
.method__connector {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out, border-color 0.3s, background 0.3s;
}

.sig-card.in-view,
.method__step.in-view,
.method__connector.in-view {
  opacity: 1;
  transform: translateY(0);
}

.sig-card:nth-child(1) { transition-delay: 0s; }
.sig-card:nth-child(2) { transition-delay: 0.1s; }
.sig-card:nth-child(3) { transition-delay: 0.2s; }
.sig-card:nth-child(4) { transition-delay: 0.3s; }
.sig-card:nth-child(5) { transition-delay: 0.4s; }
.sig-card:nth-child(6) { transition-delay: 0.5s; }
.sig-card:nth-child(7) { transition-delay: 0.6s; }
.sig-card:nth-child(8) { transition-delay: 0.7s; }

.method__step:nth-child(1) { transition-delay: 0s; }
.method__connector:nth-child(2) { transition-delay: 0.1s; }
.method__step:nth-child(3) { transition-delay: 0.2s; }
.method__connector:nth-child(4) { transition-delay: 0.3s; }
.method__step:nth-child(5) { transition-delay: 0.4s; }

/* ─── Responsive ───────────────────────────────────────────────── */

@media (max-width: 1100px) {
  .hero {
    flex-direction: column;
    text-align: center;
    padding: calc(var(--space-2xl) + 40px) var(--space-lg) var(--space-xl);
  }

  .hero__content {
    max-width: 100%;
  }

  .hero__stats {
    justify-content: center;
  }

  #radar {
    width: 320px;
    height: 320px;
  }
}

@media (max-width: 860px) {
  .signals__grid {
    grid-template-columns: 1fr;
  }

  .sig-card--wide {
    max-width: 100%;
  }

  .method__flow {
    flex-direction: column;
    align-items: center;
  }

  .method__connector {
    transform: rotate(90deg);
    width: 48px;
    margin: 0;
  }

  .method__step {
    max-width: 100%;
  }

  .specs__key {
    flex: 0 0 140px;
    font-size: 0.65rem;
  }
}

@media (max-width: 600px) {
  :root {
    --space-xl: 2rem;
    --space-2xl: 3rem;
  }

  .top-bar__center {
    display: none;
  }

  .hero__title-main {
    font-size: 3rem;
  }

  .hero__stats {
    flex-direction: column;
    gap: var(--space-md);
  }

  #radar {
    width: 260px;
    height: 260px;
  }

  .specs__row {
    flex-direction: column;
  }

  .specs__key {
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: var(--space-sm) var(--space-md);
  }

  .specs__val {
    padding: var(--space-sm) var(--space-md);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-sm);
  }
}