:root {
  --color-primary: #00ff66;
  --color-accent: #f5b301;
  --color-bg: #1f2528;
  --color-bg-2: #151b1e;
  --color-text: #ffffff;
  --color-secondary: #1f2528;
  --color-cta: #f5b301;
  --color-cta-hover: #e6a400;
  --color-muted: #b3c2c7;
  --container: 1120px;
  --radius: 8px;
  --line: rgba(255, 255, 255, .12);
  --panel: rgba(255, 255, 255, .075);
  --shadow: 0 18px 54px rgba(0, 0, 0, .36);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 18% 0%, rgba(0, 255, 102, .14), transparent 34rem),
    linear-gradient(180deg, var(--color-bg), var(--color-bg-2));
  color: var(--color-text);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

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

a {
  color: inherit;
}

.container {
  width: calc(100vw - 32px);
  max-width: var(--container);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 20px;
  align-items: center;
  padding: 12px max(16px, calc((100vw - var(--container)) / 2));
  background: rgba(21, 27, 30, .88);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand img {
  width: 136px;
  height: auto;
}

.nav {
  display: flex;
  justify-content: center;
  gap: 18px;
}

.nav a,
.site-footer a,
.toc-card a {
  color: var(--color-muted);
  text-decoration: none;
}

.nav a:hover,
.site-footer a:hover,
.toc-card a:hover {
  color: var(--color-primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 19px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--color-cta), var(--color-cta-hover));
  color: #18140a;
  font-weight: 900;
  text-decoration: none;
  box-shadow: 0 14px 34px rgba(245, 179, 1, .22);
  transition: transform .18s ease, filter .18s ease;
}

.btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.05);
}

.btn-small {
  min-height: 40px;
  padding: 9px 15px;
  white-space: nowrap;
}

.guide-hero {
  padding: clamp(44px, 8vw, 92px) 0 44px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, .88fr) minmax(360px, 1fr);
  gap: 24px;
  align-items: start;
}

.hero-copy,
.toc-card,
.step-card,
.tip-card,
.mini-card,
.faq-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, .095), rgba(255, 255, 255, .045));
  box-shadow: var(--shadow);
}

.hero-copy {
  padding: clamp(24px, 4vw, 42px);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--color-primary);
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 14px;
  font-size: clamp(2.5rem, 6vw, 5rem);
  line-height: 1.03;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(1.55rem, 3vw, 2.45rem);
  line-height: 1.14;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
}

.lead {
  max-width: 650px;
  color: #e4eef0;
  font-size: 1.12rem;
}

.learn-card {
  margin: 22px 0;
  padding: 18px;
  border-radius: var(--radius);
  background: rgba(0, 255, 102, .1);
  border: 1px solid rgba(0, 255, 102, .22);
}

.learn-card strong {
  display: block;
  margin-bottom: 8px;
}

.learn-card ul {
  margin: 0;
  padding-left: 20px;
  color: #dce8ea;
}

.toc-card {
  overflow: hidden;
}

.toc-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: 72% center;
}

.toc-card > div {
  display: grid;
  gap: 10px;
  padding: 18px;
}

.toc-card strong {
  color: var(--color-accent);
}

.section {
  padding: clamp(42px, 8vw, 82px) 0;
}

.section-head {
  max-width: 820px;
  margin-bottom: 24px;
}

.section-head p,
.tip-card p,
.mini-card span,
.faq-card p,
.glossary dd {
  color: #d7e3e6;
}

.steps {
  display: grid;
  gap: 15px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: steps;
}

.step-card {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 18px;
  padding: 16px;
  align-items: center;
}

.step-card img {
  width: 100%;
  height: 132px;
  border-radius: var(--radius);
  object-fit: cover;
  background: #fff;
}

.step-card span {
  display: inline-flex;
  margin-bottom: 6px;
  color: var(--color-accent);
  font-weight: 900;
  text-transform: uppercase;
}

.step-card p {
  margin: 0;
  color: #d7e3e6;
}

.info-band {
  background: rgba(0, 0, 0, .16);
  border-block: 1px solid var(--line);
}

.info-grid,
.glossary-layout {
  display: grid;
  grid-template-columns: minmax(260px, .62fr) minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.tip-card,
.mini-card,
.faq-card {
  padding: 22px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

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

.mini-icons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.mini-icons img {
  width: auto;
  height: 30px;
  padding: 5px 7px;
  border-radius: var(--radius);
  background: #fff;
}

.mini-card strong {
  color: var(--color-accent);
  font-size: 1.1rem;
}

.mini-card span {
  margin-top: 6px;
}

.glossary {
  margin: 0;
  display: grid;
  gap: 12px;
}

.glossary div {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .055);
}

.glossary dt {
  color: var(--color-accent);
  font-weight: 900;
}

.glossary dd {
  margin: 6px 0 0;
}

.faq-section {
  padding-top: 0;
}

details {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

summary {
  cursor: pointer;
  font-weight: 900;
}

details p {
  margin: 10px 0 0;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(0, 0, 0, .28);
}

.footer-inner {
  display: grid;
  grid-template-columns: 160px 1fr auto;
  gap: 20px;
  align-items: center;
  padding-block: 26px;
}

.footer-inner img {
  width: 140px;
  height: auto;
}

.footer-inner p {
  margin: 0;
  color: var(--color-muted);
}

.footer-inner nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px;
}

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

  .nav {
    display: none;
  }

  .hero-grid,
  .info-grid,
  .glossary-layout,
  .footer-inner {
    grid-template-columns: 1fr;
  }

}

@media (max-width: 640px) {
  .site-header {
    padding: 10px 16px;
  }

  .brand img {
    width: 122px;
  }

  .btn-small {
    padding-inline: 12px;
    font-size: .88rem;
  }

  .hero-copy,
  .tip-card,
  .mini-card,
  .faq-card {
    padding: 20px;
  }

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

  .cards-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner nav {
    justify-content: flex-start;
  }
}