:root {
  color-scheme: dark;
  --space: #07142f;
  --space-deep: #030916;
  --space-mid: #10254a;
  --signal: #29d8f2;
  --signal-soft: #6ee8ef;
  --sun: #ffc857;
  --safe: #5ce0a4;
  --coral: #ff8a74;
  --white: #f7fbff;
  --muted: #a9b7d4;
  --line: rgba(169, 183, 212, 0.18);
  --font-ui: -apple-system, "SF Pro Text", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--white);
  background:
    radial-gradient(circle at 78% 18%, rgba(41, 216, 242, 0.14), transparent 28%),
    radial-gradient(circle at 12% 54%, rgba(134, 105, 248, 0.12), transparent 27%),
    var(--space-deep);
  font-family: var(--font-ui);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: 0.46;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 8% 18%, rgba(255,255,255,0.9) 0 1px, transparent 1.5px),
    radial-gradient(circle at 18% 72%, rgba(255,255,255,0.7) 0 1px, transparent 1.4px),
    radial-gradient(circle at 34% 12%, rgba(255,255,255,0.8) 0 1px, transparent 1.6px),
    radial-gradient(circle at 48% 82%, rgba(255,255,255,0.72) 0 1px, transparent 1.5px),
    radial-gradient(circle at 63% 32%, rgba(255,255,255,0.84) 0 1px, transparent 1.6px),
    radial-gradient(circle at 76% 74%, rgba(255,255,255,0.7) 0 1px, transparent 1.5px),
    radial-gradient(circle at 92% 14%, rgba(255,255,255,0.86) 0 1px, transparent 1.6px);
  background-size: 720px 520px;
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible {
  outline: 3px solid var(--sun);
  outline-offset: 4px;
}

.site-shell {
  width: min(1440px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 0 48px;
}

.topbar {
  min-height: 96px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  border-bottom: 1px solid var(--line);
}

.brand,
.brand span,
.top-actions,
.hero-actions,
.truth-strip,
.demo-actions,
footer {
  display: flex;
  align-items: center;
}

.brand {
  gap: 13px;
}

.brand img {
  width: 58px;
  height: 54px;
  object-fit: contain;
  filter: drop-shadow(0 10px 18px rgba(0,0,0,0.38));
}

.brand span {
  align-items: flex-start;
  flex-direction: column;
  gap: 2px;
}

.brand strong {
  font-size: 20px;
  letter-spacing: 0.04em;
}

.brand small {
  color: var(--signal-soft);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.top-actions {
  gap: 14px;
}

.top-actions > a {
  min-height: 44px;
  padding: 0 16px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: #dce7f7;
  font-size: 14px;
  font-weight: 800;
  transition: border-color 180ms ease, background 180ms ease;
}

.top-actions > a:hover {
  border-color: rgba(110, 232, 239, 0.5);
  background: rgba(41, 216, 242, 0.08);
}

.status-pill {
  min-height: 38px;
  padding: 0 13px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(92, 224, 164, 0.28);
  border-radius: 999px;
  color: #c8f8e3;
  background: rgba(92, 224, 164, 0.08);
  font-size: 13px;
  font-weight: 800;
}

.status-pill i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--safe);
  box-shadow: 0 0 12px var(--safe);
}

.hero {
  min-height: 720px;
  padding: 78px 0 64px;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(520px, 1.08fr);
  align-items: center;
  gap: 48px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--signal-soft);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.18em;
}

h1,
h2,
h3,
p {
  text-wrap: pretty;
}

h1 {
  margin: 0;
  max-width: 720px;
  font-size: clamp(48px, 5.3vw, 84px);
  line-height: 1.06;
  letter-spacing: -0.05em;
}

h1 em {
  color: var(--sun);
  font-style: normal;
  text-shadow: 0 0 28px rgba(255, 200, 87, 0.16);
}

.hero-lead {
  max-width: 640px;
  margin: 28px 0 0;
  color: #c2cee1;
  font-size: 18px;
  line-height: 1.8;
}

.hero-actions {
  margin-top: 34px;
  flex-wrap: wrap;
  gap: 12px;
}

.primary-action,
.secondary-action {
  min-height: 58px;
  border-radius: 17px;
  font-weight: 900;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.primary-action {
  min-width: 238px;
  padding: 11px 20px;
  display: grid;
  place-items: center start;
  color: var(--space-deep);
  background: var(--signal-soft);
  box-shadow: 0 18px 38px rgba(41, 216, 242, 0.17);
}

.primary-action span,
.primary-action strong {
  display: block;
}

.primary-action span {
  font-size: 17px;
}

.primary-action strong {
  margin-top: 2px;
  color: #1d5061;
  font-size: 11px;
  letter-spacing: 0.04em;
}

.secondary-action {
  padding: 0 20px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(110, 232, 239, 0.26);
  color: #dfeafa;
  background: rgba(255,255,255,0.04);
}

.primary-action:hover,
.secondary-action:hover {
  transform: translateY(-2px);
}

.primary-action:hover {
  box-shadow: 0 22px 46px rgba(41, 216, 242, 0.25);
}

.secondary-action:hover {
  background: rgba(110, 232, 239, 0.08);
}

.truth-strip {
  margin-top: 25px;
  flex-wrap: wrap;
  gap: 8px;
}

.truth-strip span {
  padding: 7px 10px;
  border: 1px solid rgba(169, 183, 212, 0.14);
  border-radius: 9px;
  color: #98a8c4;
  background: rgba(255,255,255,0.025);
  font-size: 11px;
  font-weight: 800;
}

.signal-orbit {
  position: relative;
  min-height: 590px;
  isolation: isolate;
}

.signal-orbit::before {
  content: "";
  position: absolute;
  inset: 12% 5%;
  z-index: -3;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(41, 216, 242, 0.13), transparent 65%);
  filter: blur(18px);
}

.orbit-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  border: 1px solid rgba(110, 232, 239, 0.17);
  border-radius: 50%;
  transform: translate(-50%, -50%) rotate(-11deg);
}

.ring-one {
  width: 440px;
  height: 440px;
}

.ring-two {
  width: 590px;
  height: 330px;
  border-color: rgba(255, 200, 87, 0.13);
  transform: translate(-50%, -50%) rotate(18deg);
}

.orbit-core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 246px;
  height: 246px;
  padding: 28px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(110, 232, 239, 0.22);
  border-radius: 50%;
  background: rgba(7, 20, 47, 0.78);
  box-shadow: inset 0 0 54px rgba(41, 216, 242, 0.08), 0 34px 80px rgba(0,0,0,0.28);
  transform: translate(-50%, -50%);
  backdrop-filter: blur(18px);
}

.orbit-core img {
  width: 112px;
  height: 106px;
  object-fit: contain;
  filter: drop-shadow(0 18px 22px rgba(0,0,0,0.35));
}

.orbit-core span,
.orbit-core strong {
  text-align: center;
}

.orbit-core span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.orbit-core strong {
  font-size: 15px;
}

.orbit-card {
  position: absolute;
  min-width: 176px;
  min-height: 86px;
  padding: 13px 15px;
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid rgba(169, 183, 212, 0.18);
  border-radius: 21px;
  background: rgba(7, 20, 47, 0.84);
  box-shadow: 0 24px 48px rgba(0,0,0,0.24);
  backdrop-filter: blur(16px);
}

.orbit-card img {
  width: 58px;
  height: 58px;
  object-fit: contain;
}

.orbit-card span,
.orbit-card small,
.orbit-card strong {
  display: block;
}

.orbit-card small {
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.orbit-card strong {
  margin-top: 4px;
  font-size: 16px;
}

.sun-card {
  top: 8%;
  left: 4%;
}

.satellite-card {
  top: 18%;
  right: 0;
}

.signal-card {
  right: 8%;
  bottom: 8%;
}

.demo-section {
  padding: 70px 0 84px;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 40px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(36px, 4vw, 58px);
  letter-spacing: -0.04em;
}

.section-heading > p {
  max-width: 500px;
  margin: 0 0 7px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.demo-card {
  margin-top: 34px;
  display: grid;
  grid-template-columns: minmax(360px, 0.86fr) minmax(0, 1.14fr);
  overflow: hidden;
  border: 1px solid rgba(110, 232, 239, 0.18);
  border-radius: 30px;
  background: rgba(9, 25, 55, 0.7);
  box-shadow: 0 34px 88px rgba(0,0,0,0.23);
}

.demo-visual {
  position: relative;
  min-height: 430px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: center;
  gap: 12px;
  overflow: hidden;
  padding: 54px 32px;
  background:
    linear-gradient(90deg, rgba(110,232,239,0.07) 1px, transparent 1px),
    linear-gradient(rgba(110,232,239,0.06) 1px, transparent 1px),
    #07142f;
  background-size: 54px 54px;
}

.demo-visual::before {
  content: "1000 — 2000 MHz";
  position: absolute;
  left: 26px;
  bottom: 21px;
  color: rgba(169, 183, 212, 0.62);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.mini-task {
  position: relative;
  z-index: 2;
  min-width: 0;
  min-height: 146px;
  padding: 20px 14px;
  display: grid;
  place-items: center;
  gap: 10px;
  border: 1px solid rgba(169, 183, 212, 0.16);
  border-radius: 22px;
  background: rgba(3, 9, 22, 0.62);
}

.mini-task img {
  width: 78px;
  height: 74px;
  object-fit: contain;
}

.mini-task span {
  color: #dce7f7;
  font-size: 13px;
  font-weight: 900;
}

.scan-line {
  position: absolute;
  top: 12%;
  bottom: 12%;
  left: 0;
  z-index: 3;
  width: 3px;
  background: var(--signal-soft);
  box-shadow: 0 0 26px 7px rgba(41, 216, 242, 0.22);
}

.demo-copy {
  padding: 48px 52px;
}

.demo-kicker {
  display: flex;
  align-items: center;
  gap: 9px;
}

.demo-kicker span,
.demo-kicker em {
  padding: 6px 9px;
  border-radius: 9px;
  font-size: 10px;
  font-style: normal;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.demo-kicker span {
  color: var(--space-deep);
  background: var(--sun);
}

.demo-kicker em {
  color: #c8f8e3;
  background: rgba(92, 224, 164, 0.1);
}

.demo-copy h3 {
  margin: 18px 0 0;
  font-size: 38px;
  letter-spacing: -0.03em;
}

.demo-copy > p {
  margin: 17px 0 0;
  color: #bbc8dc;
  font-size: 15px;
  line-height: 1.8;
}

.demo-copy ul {
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
  list-style: none;
}

.demo-copy li {
  position: relative;
  padding-left: 19px;
  color: #dce7f7;
  font-size: 13px;
  line-height: 1.5;
}

.demo-copy li::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal-soft);
  box-shadow: 0 0 10px rgba(110, 232, 239, 0.5);
}

.demo-actions {
  margin-top: 30px;
  flex-wrap: wrap;
  gap: 9px;
}

.demo-actions > a:not(.primary-action) {
  min-height: 46px;
  padding: 0 13px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: #cbd8eb;
  font-size: 12px;
  font-weight: 850;
}

.primary-action.compact {
  min-width: auto;
  min-height: 46px;
  padding: 0 16px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  font-size: 13px;
}

.roadmap {
  margin-top: 18px;
  padding: 22px 26px;
  display: grid;
  grid-template-columns: auto minmax(270px, 0.75fr) minmax(320px, 1.25fr);
  align-items: center;
  gap: 20px;
  border: 1px dashed rgba(255, 200, 87, 0.24);
  border-radius: 20px;
  background: rgba(255, 200, 87, 0.035);
}

.roadmap span {
  color: var(--sun);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.09em;
}

.roadmap strong {
  font-size: 14px;
}

.roadmap p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

footer {
  min-height: 94px;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--line);
  color: #8394b0;
  font-size: 12px;
  font-weight: 800;
}

footer a {
  color: var(--signal-soft);
}

@media (prefers-reduced-motion: no-preference) {
  .orbit-card {
    animation: float-card 5s ease-in-out infinite;
  }

  .satellite-card {
    animation-delay: -1.6s;
  }

  .signal-card {
    animation-delay: -3.1s;
  }

  .scan-line {
    animation: scan 4.8s ease-in-out infinite;
  }

  @keyframes float-card {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-9px); }
  }

  @keyframes scan {
    0%, 8% { left: 4%; opacity: 0; }
    18% { opacity: 1; }
    80% { opacity: 1; }
    92%, 100% { left: 96%; opacity: 0; }
  }
}

@media (max-width: 1080px) {
  .site-shell {
    padding: 0 28px;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 56px;
  }

  .signal-orbit {
    min-height: 520px;
  }

  .demo-card {
    grid-template-columns: 1fr;
  }

  .roadmap {
    grid-template-columns: auto 1fr;
  }

  .roadmap p {
    grid-column: 1 / -1;
  }
}

@media (max-width: 680px) {
  .site-shell {
    padding: 0 18px;
  }

  .topbar {
    min-height: 84px;
  }

  .status-pill {
    display: none;
  }

  .top-actions > a {
    min-height: 42px;
    padding: 0 12px;
    font-size: 12px;
  }

  .brand img {
    width: 48px;
    height: 46px;
  }

  .brand strong {
    font-size: 17px;
  }

  .hero {
    min-height: auto;
    padding: 46px 0 40px;
    gap: 28px;
  }

  h1 {
    font-size: clamp(43px, 13vw, 62px);
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-actions,
  .hero-actions > a {
    width: 100%;
  }

  .signal-orbit {
    min-height: 430px;
  }

  .ring-one {
    width: 300px;
    height: 300px;
  }

  .ring-two {
    width: 360px;
    height: 230px;
  }

  .orbit-core {
    width: 190px;
    height: 190px;
    padding: 20px;
  }

  .orbit-core img {
    width: 86px;
    height: 80px;
  }

  .orbit-card {
    min-width: 132px;
    min-height: 64px;
    padding: 9px 10px;
    gap: 8px;
    border-radius: 16px;
  }

  .orbit-card img {
    width: 42px;
    height: 42px;
  }

  .orbit-card strong {
    font-size: 13px;
  }

  .sun-card { top: 2%; left: 0; }
  .satellite-card { top: 17%; right: 0; }
  .signal-card { right: 1%; bottom: 4%; }

  .demo-section {
    padding: 54px 0 62px;
  }

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .demo-visual {
    min-height: 330px;
    padding: 44px 18px;
  }

  .mini-task {
    min-height: 116px;
    padding: 15px 8px;
  }

  .mini-task img {
    width: 56px;
    height: 54px;
  }

  .demo-copy {
    padding: 32px 24px;
  }

  .demo-copy h3 {
    font-size: 31px;
  }

  .demo-actions,
  .demo-actions > a {
    width: 100%;
  }

  .roadmap {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .roadmap p {
    grid-column: auto;
  }
}