:root {
  color-scheme: dark;
  --bg: #041022;
  --bg-deep: #020914;
  --panel: rgba(10, 29, 55, 0.76);
  --panel-strong: #0a1d37;
  --line: rgba(113, 185, 230, 0.2);
  --line-bright: rgba(90, 224, 255, 0.58);
  --text: #f3fbff;
  --muted: #a7bfd2;
  --cyan: #20d9ff;
  --cyan-soft: #95efff;
  --mint: #72f4c8;
  --blue: #2276ff;
  --shadow: 0 24px 80px rgba(0, 11, 28, 0.52);
  --radius: 22px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 78% 12%, rgba(0, 143, 255, 0.15), transparent 28rem),
    radial-gradient(circle at 18% 42%, rgba(0, 216, 255, 0.07), transparent 26rem),
    linear-gradient(180deg, #06152c 0%, var(--bg) 44%, var(--bg-deep) 100%);
  color: var(--text);
  font-family: "Segoe UI", "Microsoft YaHei UI", "PingFang SC", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  transform: translateY(-150%);
  padding: 10px 15px;
  border-radius: 10px;
  background: var(--text);
  color: #031020;
  font-weight: 700;
}

.skip-link:focus { transform: translateY(0); }

.signal-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.19;
  background-image:
    linear-gradient(rgba(79, 157, 206, 0.13) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 157, 206, 0.13) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, black, transparent 82%);
}

.site-header {
  position: relative;
  z-index: 10;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  min-height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
}

.brand img, .footer-brand img {
  object-fit: contain;
  filter: drop-shadow(0 0 12px rgba(32, 217, 255, 0.4));
}

.brand span, .footer-brand span { display: grid; line-height: 1.15; }
.brand strong { font-size: 0.95rem; letter-spacing: 0.13em; }
.brand small { margin-top: 5px; color: var(--muted); font-size: 0.74rem; letter-spacing: 0.22em; }

nav { display: flex; align-items: center; gap: 28px; }
nav a { color: #c2d5e3; font-size: 0.9rem; text-decoration: none; transition: color 160ms ease; }
nav a:hover { color: var(--text); }

.nav-download {
  padding: 9px 16px;
  border: 1px solid rgba(32, 217, 255, 0.5);
  border-radius: 999px;
  background: rgba(32, 217, 255, 0.08);
}

main, footer {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.hero {
  min-height: 690px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(390px, 0.95fr);
  align-items: center;
  gap: 48px;
  padding: 72px 0 58px;
}

.eyebrow, .section-kicker, .release-label {
  color: var(--cyan-soft);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.eyebrow { display: flex; align-items: center; gap: 10px; }
.eyebrow span { width: 34px; height: 1px; background: var(--cyan); box-shadow: 0 0 10px var(--cyan); }

h1, h2, h3, p { margin-top: 0; }

h1 {
  margin: 25px 0 24px;
  max-width: 720px;
  font-size: clamp(3.35rem, 7vw, 6.4rem);
  line-height: 0.98;
  letter-spacing: -0.07em;
  font-weight: 760;
}

h1 em {
  display: inline-block;
  margin-top: 10px;
  color: transparent;
  background: linear-gradient(100deg, #fff 5%, var(--cyan) 58%, var(--mint));
  background-clip: text;
  -webkit-background-clip: text;
  font-style: normal;
}

.hero-lead {
  max-width: 660px;
  margin-bottom: 30px;
  color: #bdd0df;
  font-size: 1.08rem;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 13px; }

.button {
  min-height: 56px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
  transition: transform 170ms ease, border-color 170ms ease, background 170ms ease;
}

.button:hover { transform: translateY(-2px); }
.button:focus-visible, nav a:focus-visible, button:focus-visible { outline: 3px solid rgba(114, 244, 200, 0.75); outline-offset: 3px; }

.button-primary {
  min-width: 246px;
  color: #001522;
  background: linear-gradient(105deg, #74efff, #36dfff 48%, #72f4c8);
  box-shadow: 0 14px 34px rgba(18, 197, 231, 0.2);
}

.button small { font-size: 0.72rem; font-weight: 700; opacity: 0.7; }
.button-secondary { border-color: var(--line-bright); background: rgba(8, 28, 51, 0.62); }

.hero-meta {
  display: flex;
  gap: 0;
  margin-top: 42px;
  border-top: 1px solid var(--line);
}

.hero-meta div { min-width: 138px; padding: 18px 22px 0 0; display: grid; }
.hero-meta div + div { padding-left: 22px; border-left: 1px solid var(--line); }
.hero-meta span { color: #7f9bb0; font-size: 0.75rem; }
.hero-meta strong { margin-top: 3px; font-size: 0.92rem; letter-spacing: 0.04em; }

.hero-visual {
  position: relative;
  min-height: 520px;
  display: grid;
  place-items: center;
  isolation: isolate;
}

.hero-visual::before {
  content: "";
  position: absolute;
  width: 76%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 196, 255, 0.22), transparent 65%);
  filter: blur(18px);
}

.hero-visual img {
  width: min(90%, 490px);
  height: auto;
  position: relative;
  z-index: 3;
  filter: drop-shadow(0 0 32px rgba(0, 181, 255, 0.32));
  animation: float 6s ease-in-out infinite;
}

.visual-orbit {
  position: absolute;
  border: 1px solid rgba(68, 218, 255, 0.22);
  border-radius: 50%;
  box-shadow: inset 0 0 24px rgba(20, 161, 230, 0.05);
}

.orbit-one { width: 90%; aspect-ratio: 1; }
.orbit-two { width: 73%; aspect-ratio: 1; border-style: dashed; animation: spin 22s linear infinite; }
.orbit-three { width: 54%; aspect-ratio: 1; border-color: rgba(114, 244, 200, 0.22); }

.status-chip {
  position: absolute;
  z-index: 5;
  min-width: 138px;
  padding: 11px 14px;
  border: 1px solid rgba(111, 192, 234, 0.22);
  border-radius: 12px;
  background: rgba(4, 18, 36, 0.84);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  display: grid;
  grid-template-columns: 10px 1fr;
  column-gap: 8px;
}

.status-chip i { width: 7px; height: 7px; margin-top: 5px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 9px var(--mint); }
.status-chip span { color: #8aa7ba; font-size: 0.7rem; }
.status-chip strong { grid-column: 2; font-size: 0.77rem; letter-spacing: 0.12em; }
.status-online { top: 18%; left: 0; }
.status-sync { top: 31%; right: -2%; }
.status-secure { bottom: 14%; left: 7%; }

.trust-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(8, 28, 51, 0.52);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.trust-strip > div { min-height: 110px; padding: 24px 28px; display: flex; align-items: center; gap: 17px; }
.trust-strip > div + div { border-left: 1px solid var(--line); }
.trust-strip b { color: var(--cyan); font: 700 0.7rem/1 Consolas, monospace; }
.trust-strip span { display: grid; color: #92aabd; font-size: 0.82rem; }
.trust-strip strong { color: var(--text); font-size: 1rem; }

.section { padding: 130px 0 20px; }
.section-heading { max-width: 760px; margin-bottom: 48px; }
.section-heading.compact { margin-bottom: 34px; }
.section-heading h2, .integrity h2, .boundaries h2 {
  margin: 10px 0 15px;
  font-size: clamp(2.2rem, 4vw, 3.65rem);
  line-height: 1.14;
  letter-spacing: -0.045em;
}
.section-heading > p:last-child, .integrity-copy > p:not(.section-kicker), .boundaries > p { color: var(--muted); font-size: 1rem; }

.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.feature-card {
  min-height: 330px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(12, 34, 62, 0.84), rgba(5, 19, 37, 0.84));
  box-shadow: var(--shadow);
  overflow: hidden;
}

.feature-primary { background: linear-gradient(135deg, rgba(8, 50, 78, 0.92), rgba(6, 23, 43, 0.86)); }
.feature-index { color: var(--cyan); font: 700 0.72rem/1 Consolas, monospace; letter-spacing: 0.12em; }
.feature-card h3 { margin: 32px 0 10px; font-size: 1.45rem; }
.feature-card p { max-width: 590px; color: var(--muted); }

.mini-terminal { margin-top: 25px; border-top: 1px solid var(--line); }
.mini-terminal div { min-height: 39px; display: grid; grid-template-columns: 12px 1fr auto; align-items: center; gap: 8px; border-bottom: 1px solid rgba(113, 185, 230, 0.1); color: #a9bfd0; font-size: 0.78rem; }
.mini-terminal b { color: var(--mint); font-size: 0.7rem; letter-spacing: 0.06em; }
.mini-terminal div:last-child b { color: #7e98aa; }
.dot { width: 6px; height: 6px; border-radius: 50%; background: #4e6779; }
.dot.active { background: var(--mint); box-shadow: 0 0 8px var(--mint); }

.task-lines { margin-top: 34px; display: grid; gap: 8px; }
.task-lines span { display: block; height: 8px; border-radius: 99px; background: linear-gradient(90deg, rgba(32, 217, 255, 0.62), rgba(32, 217, 255, 0.04)); }
.task-lines span:nth-child(2) { width: 82%; }
.task-lines span:nth-child(3) { width: 66%; }
.task-lines span:nth-child(4) { width: 43%; }

.version-lock { margin-top: 40px; display: flex; align-items: center; gap: 12px; color: #8faabc; font-size: 0.8rem; }
.version-lock b { color: var(--text); }
.version-lock i { flex: 1; height: 1px; background: linear-gradient(90deg, var(--cyan), var(--mint)); position: relative; }
.version-lock i::after { content: ""; position: absolute; right: 0; top: -3px; width: 7px; height: 7px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 9px var(--mint); }

.security-line { margin-top: 38px; padding: 13px; border: 1px solid rgba(114, 244, 200, 0.22); border-radius: 11px; display: flex; align-items: center; gap: 9px; color: #93acbd; font-size: 0.72rem; }
.security-line i { width: 8px; height: 8px; border-radius: 50%; background: var(--mint); }
.security-line b { margin-left: auto; color: var(--mint); }

.steps { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.steps li { display: grid; grid-template-columns: 90px 1fr; gap: 24px; padding: 30px 0; border-bottom: 1px solid var(--line); }
.steps > li > span { color: var(--cyan); font: 700 0.8rem/1.5 Consolas, monospace; }
.steps h3 { margin-bottom: 4px; font-size: 1.15rem; }
.steps p { margin-bottom: 0; color: var(--muted); }
code { color: #c9f7ff; font-family: Consolas, "SFMono-Regular", monospace; }

.install-cta {
  margin-top: 34px;
  padding: 28px 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border: 1px solid var(--line-bright);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(15, 65, 93, 0.78), rgba(7, 28, 51, 0.88));
  box-shadow: var(--shadow);
}
.install-cta h3 { margin: 8px 0 3px; font-size: 1.5rem; }
.install-cta p { margin: 0; color: var(--muted); font-size: 0.86rem; }

.integrity { display: grid; grid-template-columns: 0.9fr 1.1fr; align-items: center; gap: 70px; }
.signature-note { padding-left: 15px; border-left: 2px solid rgba(255, 196, 92, 0.55); font-size: 0.88rem !important; }
.hash-panel { padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: #06152a; box-shadow: var(--shadow); }
.hash-head { display: flex; justify-content: space-between; gap: 15px; margin-bottom: 20px; color: #809caf; font-size: 0.74rem; letter-spacing: 0.1em; }
.hash-head strong { color: var(--mint); }
.hash-panel code { display: block; padding: 18px; border-radius: 12px; background: rgba(1, 8, 18, 0.68); color: #c9f7ff; font-size: 0.86rem; line-height: 1.75; overflow-wrap: anywhere; }
.hash-panel button { margin-top: 14px; padding: 10px 14px; border: 1px solid var(--line-bright); border-radius: 10px; background: rgba(32, 217, 255, 0.07); color: var(--text); cursor: pointer; }
.hash-panel button:hover { background: rgba(32, 217, 255, 0.13); }
#copy-status { min-height: 20px; margin: 8px 0 0; color: var(--mint); font-size: 0.78rem; }

.boundaries { margin-top: 110px; padding: 34px 0; display: grid; grid-template-columns: 0.65fr 1.35fr; gap: 60px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.boundaries h2 { margin-bottom: 0; }
.boundaries > p { margin: 0; align-self: center; }

footer {
  min-height: 210px;
  padding: 48px 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: start;
}
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-brand strong { font-size: 0.9rem; }
.footer-brand small { margin-top: 5px; color: #718ba0; font-size: 0.74rem; }
.footer-contact { display: grid; text-align: right; font-size: 0.78rem; }
.footer-contact span { margin-bottom: 4px; color: #718ba0; }
.footer-contact strong { font-weight: 600; }
footer > p { grid-column: 1 / -1; margin: 18px 0 0; color: #5e788d; font-size: 0.75rem; }

@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 980px) {
  nav a:not(.nav-download) { display: none; }
  .hero { min-height: auto; grid-template-columns: 1fr; padding-top: 58px; }
  .hero-copy { max-width: 760px; }
  .hero-visual { min-height: 440px; width: min(560px, 100%); margin: 0 auto; }
  .trust-strip { grid-template-columns: 1fr; }
  .trust-strip > div + div { border-left: 0; border-top: 1px solid var(--line); }
  .feature-grid { grid-template-columns: 1fr; }
  .integrity { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 680px) {
  .site-header, main, footer { width: min(100% - 28px, 1180px); }
  .site-header { min-height: 74px; }
  .brand strong { font-size: 0.82rem; }
  .brand small { font-size: 0.65rem; }
  .nav-download { padding: 8px 12px; font-size: 0.78rem; }
  .hero { gap: 12px; padding-top: 46px; }
  h1 { margin-top: 18px; font-size: clamp(2.9rem, 14vw, 4.2rem); }
  .hero-lead { font-size: 1rem; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .button { width: 100%; }
  .hero-meta { display: grid; grid-template-columns: repeat(3, 1fr); }
  .hero-meta div { min-width: 0; padding-right: 10px; }
  .hero-meta div + div { padding-left: 10px; }
  .hero-meta strong { font-size: 0.76rem; }
  .hero-visual { min-height: 360px; }
  .status-chip { min-width: 120px; padding: 8px 10px; }
  .status-online { left: -2%; }
  .status-sync { right: -2%; }
  .status-secure { left: 1%; }
  .section { padding-top: 92px; }
  .feature-card { min-height: 0; padding: 24px; }
  .steps li { grid-template-columns: 45px 1fr; gap: 8px; }
  .install-cta { align-items: stretch; flex-direction: column; padding: 24px; }
  .boundaries { grid-template-columns: 1fr; gap: 16px; }
  footer { grid-template-columns: 1fr; }
  .footer-contact { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}