:root {
  color-scheme: dark;
  --ink: #071011;
  --panel: #0d1b1d;
  --signal: #63f2c6;
  --amber: #ffb84d;
  --text: #eaf7f4;
  --muted: #a1b7bb;
  --line: #29474c;
  --mono: ui-monospace, "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--ink);
  color: var(--text);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 2rem; }
body { margin: 0; line-height: 1.65; }
a { color: var(--signal); text-underline-offset: .23em; }
a:hover { color: #fff; }
a:focus-visible { outline: 3px solid var(--amber); outline-offset: 6px; border-radius: 3px; }
img { display: block; max-width: 100%; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { line-height: 1.1; }
h1 { font-size: clamp(2.7rem, 5.2vw, 4.9rem); font-weight: 800; letter-spacing: -.055em; }
h2 { font-size: clamp(2rem, 3.1vw, 2.9rem); letter-spacing: -.04em; font-weight: 750; }
h3 { font-size: 1.3rem; letter-spacing: -.025em; }
.container { width: min(1160px, calc(100% - 5rem)); margin-inline: auto; }
.muted { color: var(--muted); }
.skip-link { position: absolute; left: 1rem; top: -6rem; z-index: 10; background: var(--signal); color: var(--ink); padding: .8rem 1rem; }
.skip-link:focus { top: 1rem; color: var(--ink); }

.site-header { min-height: 108px; display: flex; align-items: center; justify-content: space-between; gap: 2rem; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: .8rem; color: var(--text); font-size: 1.2rem; font-weight: 750; letter-spacing: -.04em; text-decoration: none; white-space: nowrap; }
.brand-suffix { color: var(--signal); }
nav { display: flex; flex-wrap: wrap; gap: 1.8rem; }
nav a { font-size: .9rem; color: var(--muted); text-decoration: none; padding-block: .5rem; }
nav a[aria-current="page"] { color: var(--signal); }

.hero { display: grid; grid-template-columns: 1.3fr 1fr; align-items: center; gap: 4rem; padding-block: 6rem 4.5rem; }
.eyebrow { font-family: var(--mono); font-size: .7rem; font-weight: 600; letter-spacing: .1em; color: var(--signal); line-height: 1.8; }
.hero h1 { margin-top: 1.3rem; }
.hero h1 span { color: var(--signal); }
.signal-dot { display: inline-block; width: .5rem; height: .5rem; border-radius: 50%; margin-right: .6rem; background: var(--signal); box-shadow: 0 0 14px #63f2c640; }
.hero-description { font-size: 1.12rem; color: var(--muted); max-width: 34rem; margin-top: 1.6rem; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1.5rem; margin-top: 2rem; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 1.25rem; min-height: 50px; padding: .75rem 1.25rem; border: 1px solid transparent; border-radius: 6px; font-size: .88rem; font-weight: 700; line-height: 1.5; text-decoration: none; }
.button-primary { background: var(--signal); color: var(--ink); }
.button-primary:hover { background: #a0f8dc; color: var(--ink); }
.text-link { font-size: .85rem; color: var(--text); }
.release-note { font-family: var(--mono); font-size: .68rem; color: var(--muted); margin-top: 1.3rem; }
.release-note > span { margin-inline: .4rem; color: var(--line); }

.signal-panel { position: relative; overflow: hidden; padding: 1.3rem 1.5rem 1rem; border: 1px solid #36615c; border-radius: 16px; background: radial-gradient(ellipse at 50% 40%, #153b35 0, transparent 65%), var(--panel); box-shadow: 0 20px 90px #0003; }
.panel-topline, .panel-bottomline { display: flex; align-items: center; justify-content: space-between; gap: .6rem; font-family: var(--mono); font-size: .57rem; letter-spacing: .06em; color: var(--muted); }
.live-label { color: var(--signal); }
.signal-orbit { width: 230px; height: 230px; margin: 1.8rem auto 1.6rem; position: relative; }
.orbit { position: absolute; border: 1px solid #63f2c62e; border-radius: 50%; }
.orbit-outer { inset: 0; border-style: dashed; }
.orbit-middle { inset: 25px; }
.orbit-inner { inset: 50px; border-color: #63f2c65c; background: #63f2c608; }
.orbit-center { position: absolute; inset: 0; display: grid; place-items: center; color: var(--signal); font-family: var(--mono); font-size: 3.6rem; font-weight: 700; letter-spacing: -.1em; padding-right: .1em; }
.orbit-marker { position: absolute; top: 32px; right: 28px; width: 9px; height: 9px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 0 6px #ffb84d12; }
.morse-word { display: flex; justify-content: center; gap: 2.2rem; }
.morse-letter { text-align: center; }
.morse-marks { display: flex; align-items: center; gap: 6px; height: 16px; }
.morse-marks i { height: 7px; background: var(--signal); border-radius: 4px; }
.dit { width: 7px; }
.dah { width: 21px; }
.morse-letter > span { display: block; font-family: var(--mono); font-size: .7rem; margin-top: .4rem; color: var(--muted); }
.signal-panel figcaption { text-align: center; font-size: .8rem; color: var(--muted); margin-block: 1.2rem 1.6rem; }
.panel-bottomline { justify-content: center; gap: 1.2rem; padding-top: .9rem; border-top: 1px solid var(--line); }

.principles { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-around; gap: .8rem 2rem; padding-block: 1.25rem; border-block: 1px solid var(--line); color: var(--muted); font-family: var(--mono); font-size: .72rem; }
.principles span::before { content: "+"; color: var(--signal); margin-right: .6rem; }
.section { padding-block: 4.5rem; }
.section-heading { display: grid; grid-template-columns: 1.4fr 1fr; align-items: end; gap: 3rem; margin-bottom: 2.2rem; }
.section-heading h2 { max-width: 31rem; margin-top: .8rem; }
.section-heading > p { max-width: 25rem; color: var(--muted); }
.feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.feature-card { display: flex; flex-direction: column; align-items: flex-start; padding: 1.6rem; background: var(--panel); border: 1px solid var(--line); border-radius: 9px; }
.feature-number { font-family: var(--mono); font-size: .6rem; letter-spacing: .05em; color: var(--signal); }
.feature-card h3 { margin-block: 1.2rem .9rem; line-height: 1.3; }
.feature-card p { color: var(--muted); font-size: .9rem; margin-bottom: 1.8rem; }
.feature-tag { font-family: var(--mono); font-size: .6rem; color: var(--amber); margin-top: auto; }

.key-section { display: grid; grid-template-columns: 1.1fr 1fr; align-items: center; gap: 5rem; border-top: 1px solid var(--line); padding-top: 4rem; }
.key-section h2 { margin-top: .7rem; }
.key-section p:not(.eyebrow) { margin-top: 1.2rem; max-width: 31rem; }
.key-section .muted { font-size: .8rem; }
.key-guide { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.key-guide > div { display: flex; flex-direction: column; align-items: center; padding: 1.2rem .5rem 1.7rem; border: 1px solid var(--line); border-radius: 9px; background: var(--panel); }
.key-symbol { display: grid; place-items: center; height: 120px; font-family: var(--mono); font-size: 5rem; line-height: 1; color: var(--signal); }
.key-guide strong { font-family: var(--mono); font-size: .8rem; letter-spacing: .15em; }
.key-guide div > span:last-child { font-size: .8rem; color: var(--muted); margin-top: .6rem; }
.contact-panel { display: flex; align-items: center; justify-content: space-between; gap: 3rem; padding: 2.5rem; border: 1px solid #36615c; border-radius: 12px; background: linear-gradient(115deg, #112c27, var(--panel)); }
.contact-panel h2 { font-size: clamp(1.7rem, 2.4vw, 2.2rem); margin-block: .7rem 1rem; }
.contact-panel p:not(.eyebrow) { color: var(--muted); font-size: .9rem; }
.contact-links { display: flex; flex-direction: column; align-items: flex-start; gap: 1.2rem; flex-shrink: 0; }
.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; padding-block: 1.6rem 2rem; border-top: 1px solid var(--line); color: var(--muted); font-family: var(--mono); font-size: .7rem; }
.site-footer a { color: var(--muted); }
.site-footer > div { display: flex; flex-wrap: wrap; gap: 1.5rem; }
.footer-morse { color: var(--signal); margin-left: 1rem; font-size: .6rem; }

.policy { max-width: 820px; padding-block: 4rem 5rem; }
.policy h1 { margin-top: .8rem; font-size: clamp(2.5rem, 5vw, 4rem); }
.policy-date { color: var(--muted); font-family: var(--mono); font-size: .8rem; margin-block: 1.2rem 2rem; }
.policy > p:not(.eyebrow, .policy-date), .policy section p, .policy li { color: #c3d4d4; }
.policy p + p { margin-top: 1rem; }
.policy section { margin-top: 2.5rem; }
.policy h2 { font-size: 1.35rem; line-height: 1.4; letter-spacing: -.02em; margin-bottom: .9rem; }
.policy ul { padding-left: 1.4rem; }
.policy li { padding-left: .3rem; margin-block: .5rem; }
.policy a { overflow-wrap: anywhere; }
.policy-summary { margin-top: 2rem; padding: 1.5rem; border: 1px solid #36615c; border-left: 3px solid var(--signal); border-radius: 5px; background: var(--panel); }
.policy-summary h2 { color: var(--signal); }
.policy-summary p { color: var(--text); }
.not-found { max-width: 760px; padding-block: 7rem; }
.not-found h1 { margin-top: 1rem; }
.not-found p:not(.eyebrow) { color: var(--muted); margin-block: 1.5rem; }

@media (min-width: 1500px) {
  .hero { padding-block: 7rem 5rem; }
}

@media (max-width: 1000px) {
  .hero { gap: 2.5rem; }
  .hero h1 { font-size: clamp(2.6rem, 5.7vw, 4rem); }
  .hero-actions { gap: 1.3rem; }
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .key-section { gap: 2.5rem; }
  .contact-panel { padding: 2rem; gap: 2rem; }
}

@media (max-width: 760px) {
  .container { width: calc(100% - 3rem); }
  .site-header { min-height: 92px; gap: 1rem; }
  nav { gap: 1rem; }
  nav a { font-size: .8rem; }
  .brand { font-size: 1.05rem; gap: .5rem; }
  .brand img { width: 34px; height: 34px; }
  .hero { grid-template-columns: 1fr; gap: 2.8rem; padding-block: 3.5rem 2.5rem; }
  .hero h1 { font-size: clamp(2.7rem, 9vw, 4.4rem); }
  .hero-description { max-width: 36rem; font-size: 1.05rem; }
  .signal-panel { width: min(100%, 470px); justify-self: center; }
  .section { padding-block: 3rem; }
  .section-heading { grid-template-columns: 1fr; gap: 1.2rem; }
  .section-heading > p { max-width: 35rem; }
  .key-section { grid-template-columns: 1fr; padding-top: 3rem; }
  .key-guide { max-width: 450px; width: 100%; }
  .contact-panel { flex-direction: column; align-items: flex-start; }
  .contact-links { flex-shrink: 1; }
  .footer-morse { display: none; }
  .policy { padding-top: 3rem; }
}

@media (max-width: 480px) {
  .container { width: calc(100% - 2rem); }
  .site-header { flex-direction: column; align-items: flex-start; gap: .5rem; padding-block: 1.1rem; }
  nav { gap: 1.7rem; }
  .hero { padding-top: 2.7rem; }
  .hero h1 { font-size: clamp(2.3rem, 10vw, 3rem); }
  .hero-actions { align-items: flex-start; flex-direction: column; }
  .release-note { font-size: .59rem; }
  .signal-panel { padding-inline: 1rem; }
  .panel-topline { font-size: .5rem; }
  .signal-orbit { width: 210px; height: 210px; }
  .morse-word { gap: 1.6rem; }
  .principles { justify-content: flex-start; gap: .65rem 1.5rem; font-size: .65rem; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { padding: 1.4rem; }
  .contact-panel { padding: 1.5rem; }
  .site-footer { align-items: flex-start; flex-direction: column; gap: .8rem; }
  .policy-summary { padding: 1.2rem; }
}