:root {
  color-scheme: dark;
  --bg: #071011;
  --panel: rgba(255, 255, 255, 0.055);
  --line: rgba(255, 255, 255, 0.12);
  --text: #f6f7f4;
  --muted: #9ba9a6;
  --accent: #63f2c6;
  --accent-2: #8c7cff;
  --glow: rgba(99, 242, 198, 0.2);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}



* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 78% 18%, var(--glow), transparent 30rem),
    radial-gradient(circle at 15% 80%, rgba(140, 124, 255, 0.12), transparent 28rem),
    var(--bg);
  overflow-x: hidden;
}

body.theme-card { --bg: #070b19; --accent: #68e7ff; --accent-2: #fe6bd7; --glow: rgba(104, 231, 255, 0.18); }
body.theme-learn { --bg: #100b1c; --accent: #c7ff4d; --accent-2: #ff8a58; --glow: rgba(199, 255, 77, 0.16); }
body.theme-scan { --bg: #071317; --accent: #58f5cb; --accent-2: #5ab8ff; --glow: rgba(88, 245, 203, 0.2); }
body.theme-gpsr { --bg: #0b1018; --accent: #62b5ff; --accent-2: #57e7b6; --glow: rgba(98, 181, 255, 0.18); }

a { color: inherit; }

.shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 26px 0 40px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 54px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 800;
  letter-spacing: -0.035em;
  text-decoration: none;
  font-size: 1.1rem;
}

.brand-mark {
  width: 27px;
  height: 27px;
  border: 1px solid color-mix(in srgb, var(--accent), transparent 35%);
  border-radius: 8px;
  position: relative;
  box-shadow: inset 0 0 18px var(--glow), 0 0 24px var(--glow);
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  background: var(--accent);
  border-radius: 50%;
}
.brand-mark::before { width: 6px; height: 6px; left: 5px; top: 5px; }
.brand-mark::after { width: 9px; height: 9px; right: 4px; bottom: 4px; }

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 16px var(--accent);
}

.hero {
  min-height: 680px;
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(320px, 0.94fr);
  align-items: center;
  gap: clamp(40px, 7vw, 96px);
  padding: clamp(64px, 10vw, 128px) 0 76px;
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(3.3rem, 7.2vw, 7.2rem);
  line-height: 0.91;
  letter-spacing: -0.072em;
  max-width: 900px;
}

h1 em {
  color: var(--accent);
  font-style: normal;
  text-shadow: 0 0 42px var(--glow);
}

.lead {
  max-width: 660px;
  margin: 30px 0 0;
  color: var(--muted);
  font-size: clamp(1.02rem, 1.7vw, 1.24rem);
  line-height: 1.72;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 35px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 21px;
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 0.86rem;
  font-weight: 750;
  text-decoration: none;
}

.button-primary {
  color: #071011;
  background: var(--accent);
  border-color: var(--accent);
}

.button-secondary:hover { border-color: var(--accent); }

.visual {
  min-height: 470px;
  position: relative;
  display: grid;
  place-items: center;
}

.orbital {
  width: min(430px, 78vw);
  aspect-ratio: 1;
  position: relative;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: radial-gradient(circle, var(--panel), transparent 66%);
  box-shadow: inset 0 0 70px rgba(255,255,255,0.025);
}

.orbital::before,
.orbital::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px dashed color-mix(in srgb, var(--accent), transparent 55%);
  inset: 14%;
}

.orbital::after { inset: 31%; border-style: solid; }

.core {
  position: absolute;
  inset: 39%;
  display: grid;
  place-items: center;
  border-radius: 24px;
  background: var(--accent);
  color: #071011;
  font-size: 1rem;
  font-weight: 900;
  box-shadow: 0 0 54px var(--glow);
  transform: rotate(8deg);
}

.node {
  position: absolute;
  min-width: 118px;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(7, 16, 17, 0.78);
  backdrop-filter: blur(12px);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.node strong { display: block; margin-top: 5px; color: var(--accent); font-size: 0.8rem; }
.node-a { top: 6%; left: 7%; }
.node-b { top: 18%; right: -4%; }
.node-c { bottom: 14%; left: -5%; }
.node-d { bottom: 2%; right: 13%; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  padding: 0 0 70px;
}

.feature {
  min-height: 175px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
}

.feature span { color: var(--accent); font-size: 0.7rem; letter-spacing: 0.15em; }
.feature h2 { margin: 22px 0 8px; font-size: 1rem; }
.feature p { margin: 0; color: var(--muted); font-size: 0.86rem; line-height: 1.55; }

.notice {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.75rem;
}

.notice p { margin: 0; max-width: 760px; line-height: 1.6; }
.notice a { color: var(--text); text-decoration: none; }

@media (max-width: 880px) {
  .hero { grid-template-columns: 1fr; padding-top: 72px; }
  .visual { min-height: 390px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 540px) {
  .shell { width: min(100% - 26px, 1180px); }
  .topbar { min-height: 50px; }
  .status { font-size: 0.61rem; }
  h1 { font-size: clamp(3.1rem, 16vw, 4.8rem); }
  .hero { gap: 28px; padding-bottom: 50px; }
  .visual { min-height: 330px; }
  .orbital { width: 310px; }
  .node { min-width: 96px; padding: 10px; }
  .feature-grid { grid-template-columns: 1fr; }
  .notice { flex-direction: column; gap: 10px; }
}