:root {
  color-scheme: dark;
  --ink: #dce9ea;
  --ink-strong: #f2fbfb;
  --muted: #8ba3a6;
  --line: rgba(87, 232, 220, 0.14);
  --line-strong: rgba(87, 232, 220, 0.32);
  --panel: rgba(14, 26, 30, 0.62);
  --panel-solid: #0d181c;
  --field: rgba(10, 21, 24, 0.66);
  --accent: #35e0d0;
  --accent-strong: #7df3e6;
  --accent-deep: #0e8f8a;
  --signal: #f0b445;
  --deep: #071013;
  --glow: rgba(53, 224, 208, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--deep);
  background-image:
    radial-gradient(ellipse 80% 60% at 12% -10%, rgba(53, 224, 208, 0.16), transparent 60%),
    radial-gradient(ellipse 70% 50% at 88% 0%, rgba(94, 132, 255, 0.13), transparent 62%),
    radial-gradient(ellipse 90% 70% at 50% 120%, rgba(53, 224, 208, 0.08), transparent 65%);
  background-attachment: fixed;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(87, 232, 220, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(87, 232, 220, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 100% 80% at 50% 0%, #000 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 100% 80% at 50% 0%, #000 20%, transparent 80%);
}

header.site-header,
main,
footer {
  position: relative;
  z-index: 1;
}

a {
  color: var(--accent);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(20px, 5vw, 64px);
  background: rgba(7, 16, 19, 0.72);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--ink-strong);
}

.brand-mark {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep) 60%, #1b3b52);
  box-shadow: 0 0 0 1px rgba(125, 243, 230, 0.35), 0 0 18px var(--glow);
  display: inline-block;
}

nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 6px 11px;
  border-radius: 7px;
  border: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

nav a:hover,
nav a[aria-current="page"] {
  color: var(--accent-strong);
  border-color: var(--line);
  background: rgba(53, 224, 208, 0.06);
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(30px, 5vw, 60px) clamp(20px, 5vw, 64px) 44px;
}

.eyebrow {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  margin: 0 0 12px;
}

h1 {
  font-size: clamp(2.05rem, 4.6vw, 3.05rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin: 0 0 18px;
  color: var(--ink-strong);
  background: linear-gradient(100deg, #f2fbfb 10%, var(--accent-strong) 55%, #9ab7ff 95%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-size: clamp(1.28rem, 2.4vw, 1.62rem);
  letter-spacing: -0.015em;
  margin: 0 0 12px;
  color: var(--ink-strong);
}

h3 {
  font-size: 1rem;
  margin: 0 0 7px;
  color: var(--ink-strong);
}

p {
  margin: 0 0 16px;
}

ul {
  margin: 0 0 16px;
  padding-left: 20px;
}

li {
  margin-bottom: 8px;
}

li::marker {
  color: var(--accent);
}

strong {
  color: var(--ink-strong);
}

.lead {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 660px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 36px;
  align-items: center;
  padding-bottom: 14px;
}

.signal-panel {
  display: grid;
  gap: 12px;
  background: linear-gradient(160deg, rgba(20, 40, 46, 0.92), rgba(9, 20, 24, 0.92));
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.4) inset, 0 24px 60px -30px var(--glow);
}

.signal-panel > div {
  border-left: 2px solid transparent;
  border-image: linear-gradient(180deg, var(--signal), var(--accent)) 1;
  padding-left: 14px;
}

.signal-label {
  display: block;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.66rem;
  color: var(--accent);
  margin-bottom: 4px;
}

.signal-panel strong {
  font-weight: 600;
  font-size: 0.97rem;
  color: var(--ink-strong);
}

section {
  margin: 48px 0;
}

.band,
.status,
.direction {
  position: relative;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px clamp(20px, 3vw, 34px);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.band::before,
.status::before,
.direction::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.75;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 30px;
  align-items: start;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.feature-grid article {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.feature-grid article::after {
  content: "";
  position: absolute;
  top: 0;
  left: 20px;
  width: 34px;
  height: 2px;
  background: var(--accent);
  box-shadow: 0 0 12px var(--glow);
}

.feature-grid article:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  box-shadow: 0 24px 50px -34px var(--glow);
}

.feature-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.note {
  background: var(--field);
  border: 1px solid var(--line);
  border-left: 2px solid var(--signal);
  border-radius: 12px;
  padding: 18px 20px;
  color: var(--muted);
  font-size: 0.94rem;
}

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

.note a {
  color: var(--accent);
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 30px;
  align-items: center;
  border-top: 1px solid var(--line);
  padding-top: 36px;
}

.contact-link {
  display: inline-block;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92rem;
  background: linear-gradient(120deg, var(--accent), var(--accent-deep));
  color: #04191b;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.01em;
  padding: 12px 22px;
  border-radius: 10px;
  box-shadow: 0 0 0 1px rgba(125, 243, 230, 0.3), 0 18px 40px -22px var(--glow);
  transition: filter 0.18s ease, transform 0.18s ease;
}

.contact-link:hover {
  filter: brightness(1.12);
  transform: translateY(-1px);
}

footer {
  position: relative;
  z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: 26px clamp(20px, 5vw, 64px) 60px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.86rem;
}

footer p {
  margin: 0 0 8px;
}

footer a {
  color: var(--muted);
  text-decoration: none;
}

footer a:hover {
  color: var(--accent);
}

::selection {
  background: rgba(53, 224, 208, 0.3);
}

@media (prefers-reduced-motion: no-preference) {
  .brand-mark {
    animation: pulse 4.5s ease-in-out infinite;
  }
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 1px rgba(125, 243, 230, 0.3), 0 0 14px var(--glow); }
  50% { box-shadow: 0 0 0 1px rgba(125, 243, 230, 0.55), 0 0 26px var(--glow); }
}

@media (max-width: 760px) {
  .hero,
  .split,
  .contact {
    grid-template-columns: 1fr;
  }
}