/* Blockchain intro — single-page site */
:root {
  --bg: #070b14;
  --bg-elevated: #0d1324;
  --surface: #121a2e;
  --border: rgba(120, 162, 255, 0.18);
  --text: #e8edf7;
  --muted: #8b98b8;
  --accent: #5eead4;
  --accent-2: #7c9cff;
  --glow: rgba(94, 234, 212, 0.35);
  --radius: 14px;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: var(--surface);
  border-radius: 8px;
}

.wrap {
  width: min(1120px, 92vw);
  margin-inline: auto;
}

/* Header */
header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(7, 11, 20, 0.75);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  gap: 1rem;
}

.logo {
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 1.05rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.logo span {
  display: inline-flex;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
}

nav a {
  color: var(--muted);
  font-size: 0.92rem;
}
nav a:hover {
  color: var(--text);
  text-decoration: none;
}

.cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--accent-2), var(--accent));
  color: #041018 !important;
  font-weight: 600;
  font-size: 0.88rem;
  border: none;
  cursor: pointer;
  box-shadow: 0 0 24px var(--glow);
}
.cta:hover {
  filter: brightness(1.06);
  text-decoration: none;
}

@media (max-width: 720px) {
  .nav nav {
    display: none;
  }
}

/* Hero */
.hero {
  position: relative;
  padding: 3.5rem 0 4rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: url("assets/hero-blockchain.png") center / cover no-repeat;
  opacity: 0.45;
  mask-image: linear-gradient(180deg, black 30%, transparent 95%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 50% at 50% -10%, rgba(124, 156, 255, 0.35), transparent 60%);
  pointer-events: none;
}

.hero .wrap {
  position: relative;
  z-index: 1;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(18, 26, 46, 0.8);
  color: var(--muted);
  font-size: 0.78rem;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.1rem);
  line-height: 1.15;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.hero p.lead {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 52ch;
  margin: 0 0 1.75rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.link-quiet {
  color: var(--muted);
  font-size: 0.92rem;
}
.link-quiet:hover {
  color: var(--accent);
}

/* Sections */
section {
  padding: 4rem 0;
}

section:nth-child(even) {
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-elevated) 50%, var(--bg) 100%);
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2rem);
  margin: 0 0 0.5rem;
}

.section-desc {
  color: var(--muted);
  max-width: 60ch;
  margin: 0 0 2rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: calc(var(--radius) - 4px);
  margin-bottom: 1rem;
  border: 1px solid var(--border);
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  flex: 1;
}

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  counter-reset: step;
}

@media (max-width: 900px) {
  .steps {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 520px) {
  .steps {
    grid-template-columns: 1fr;
  }
}

.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  position: relative;
}

.step::before {
  counter-increment: step;
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 8px;
  background: rgba(94, 234, 212, 0.12);
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}

.step h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.step p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

/* Use cases */
.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pill {
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(18, 26, 46, 0.6);
  font-size: 0.88rem;
  color: var(--text);
}

/* CTA band */
.cta-band {
  text-align: center;
  padding: 3.5rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: linear-gradient(145deg, rgba(18, 26, 46, 0.9), rgba(7, 11, 20, 0.95));
  margin: 2rem 0 0;
}

.cta-band h2 {
  margin-bottom: 0.5rem;
}

.cta-band p {
  color: var(--muted);
  margin: 0 0 1.25rem;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0 3rem;
  color: var(--muted);
  font-size: 0.86rem;
}

footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

footer .site-version {
  width: 100%;
  margin: 0.5rem 0 0;
  font-size: 0.78rem;
  opacity: 0.85;
}

</think>


<｜tool▁calls▁begin｜><｜tool▁call▁begin｜>
StrReplace