:root {
  color-scheme: dark;
  --bg-1: #081121;
  --bg-2: #0f1f46;
  --bg-3: #1f4dff;
  --panel: rgba(10, 16, 33, 0.72);
  --panel-strong: rgba(8, 13, 27, 0.86);
  --panel-soft: rgba(255, 255, 255, 0.08);
  --line: rgba(255, 255, 255, 0.12);
  --text: #eef4ff;
  --text-soft: rgba(238, 244, 255, 0.76);
  --muted: rgba(238, 244, 255, 0.56);
  --accent: #78a9ff;
  --accent-2: #8ef1d1;
  --accent-3: #d3b3ff;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.28);
  --radius-lg: 30px;
  --radius-md: 24px;
  --radius-sm: 18px;
  --container: min(1120px, calc(100vw - 28px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: "SF Pro Display", "PingFang SC", "Microsoft YaHei UI", sans-serif;
  background:
    radial-gradient(38% 42% at 16% 14%, rgba(80, 144, 255, 0.52) 0%, rgba(80, 144, 255, 0) 70%),
    radial-gradient(42% 36% at 82% 10%, rgba(120, 80, 255, 0.34) 0%, rgba(120, 80, 255, 0) 72%),
    linear-gradient(135deg, var(--bg-1) 0%, var(--bg-2) 42%, var(--bg-3) 100%);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(40% 38% at 50% 8%, rgba(255, 255, 255, 0.16) 0%, rgba(255, 255, 255, 0) 72%),
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: auto, 28px 28px, 28px 28px;
  mix-blend-mode: screen;
}

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

code {
  padding: 0.14em 0.42em;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  font-size: 0.92em;
}

img {
  display: block;
  max-width: 100%;
}

.page-shell {
  position: relative;
  overflow: hidden;
  padding-bottom: 56px;
}

.container {
  width: var(--container);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
  background: rgba(8, 13, 27, 0.56);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.16);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
}

.brand-mark img {
  width: 26px;
  height: 26px;
}

.brand-name {
  font-size: 1.1rem;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.nav-link {
  color: var(--text-soft);
  font-size: 0.95rem;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: 0.18s ease;
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
}

.hero {
  padding: 54px 0 18px;
}

.hero-panel,
.section-panel,
.cta-panel {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.hero-panel {
  padding: 42px;
  background:
    radial-gradient(42% 42% at 18% 24%, rgba(120, 169, 255, 0.16) 0%, rgba(120, 169, 255, 0) 72%),
    radial-gradient(36% 38% at 82% 18%, rgba(211, 179, 255, 0.18) 0%, rgba(211, 179, 255, 0) 76%),
    var(--panel);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-soft);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1,
.section-head h2,
.cta-copy h2 {
  margin: 18px 0 0;
  font-size: clamp(2.2rem, 4vw, 4rem);
  line-height: 1.02;
  letter-spacing: -0.06em;
}

.hero-lead,
.section-head p,
.copy,
.faq-answer,
.card-copy,
.list li {
  color: var(--text-soft);
  line-height: 1.8;
}

.hero-lead {
  margin: 18px 0 0;
  max-width: 62rem;
  font-size: 1.05rem;
}

.button-row,
.chip-row,
.topic-links,
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button-row {
  margin-top: 26px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 700;
  letter-spacing: -0.02em;
  transition: transform 0.18s ease, opacity 0.18s ease, background 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: #ffffff;
  color: #111827;
}

.btn-secondary {
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.chip-row {
  margin-top: 18px;
}

.chip {
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.04);
}

.grid {
  display: grid;
  gap: 18px;
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.section {
  padding-top: 22px;
}

.section-panel {
  padding: 34px;
}

.section-head {
  margin-bottom: 24px;
}

.card,
.topic-card,
.faq-item {
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
}

.card,
.topic-card {
  padding: 22px;
}

.card-label {
  color: var(--accent);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.card-title,
.topic-card h3,
.faq-question {
  margin: 12px 0 0;
  font-size: 1.35rem;
  line-height: 1.2;
  letter-spacing: -0.04em;
}

.card-copy {
  margin: 12px 0 0;
}

.list {
  margin: 18px 0 0;
  padding-left: 18px;
}

.list li + li {
  margin-top: 10px;
}

.steps {
  counter-reset: step;
}

.step {
  position: relative;
  padding-left: 74px;
}

.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.08);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
}

.step h3 {
  margin: 0;
  font-size: 1.28rem;
  letter-spacing: -0.03em;
}

.step p {
  margin: 10px 0 0;
}

.topic-links {
  margin-top: 24px;
}

.topic-link {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-soft);
  background: rgba(255, 255, 255, 0.05);
}

.topic-link:hover,
.topic-link.is-current {
  color: var(--text);
  background: rgba(255, 255, 255, 0.1);
}

.faq {
  display: grid;
  gap: 14px;
}

.faq-item {
  padding: 18px 20px;
}

.faq-question {
  margin: 0;
}

.faq-answer {
  margin: 12px 0 0;
}

.cta-panel {
  margin-top: 22px;
  padding: 34px;
  background:
    radial-gradient(42% 42% at 80% 14%, rgba(142, 241, 209, 0.14) 0%, rgba(142, 241, 209, 0) 72%),
    radial-gradient(40% 38% at 10% 84%, rgba(120, 169, 255, 0.18) 0%, rgba(120, 169, 255, 0) 72%),
    var(--panel-strong);
}

.footer {
  padding-top: 26px;
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-links {
  margin-top: 12px;
}

.footer-links a {
  color: var(--text-soft);
}

@media (max-width: 920px) {
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .hero-panel,
  .section-panel,
  .cta-panel {
    padding: 24px;
  }

  .site-header-inner {
    padding: 10px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .hero {
    padding-top: 28px;
  }

  .hero-lead,
  .section-head p,
  .copy,
  .faq-answer,
  .card-copy,
  .list li {
    font-size: 0.96rem;
  }

  .step {
    padding-left: 0;
    padding-top: 60px;
  }
}