:root {
  --color-bg: #eef8fa;
  --color-brand: #cff6ff;
  --color-primary: #e00330;
  --color-reward: #ffd84d;
  --color-text: #101828;
  --color-muted: #667085;
  --color-surface: #ffffff;
  --color-warm: #fff7f0;
  --color-border: rgba(16, 24, 40, 0.07);
  --color-header: rgba(238, 248, 250, 0.88);
  --color-primary-soft: rgba(224, 3, 48, 0.08);
  --color-primary-border: rgba(224, 3, 48, 0.16);
  --color-shadow: rgba(16, 24, 40, 0.08);
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", sans-serif;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --radius-small: 12px;
  --radius-button: 16px;
  --radius-card: 20px;
  --radius-large: 28px;
  --radius-pill: 999px;
  --shadow-surface: 0 12px 32px var(--color-shadow);
  --shell: 1120px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: radial-gradient(circle at 10% 5%, var(--color-surface), transparent 30rem);
  content: "";
  pointer-events: none;
}
img, svg { display: block; max-width: 100%; }
img { height: auto; object-fit: contain; }
a { color: inherit; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--color-primary); outline-offset: 3px; border-radius: var(--space-1); }
.nav, .page, .footer-inner { width: min(calc(100% - 48px), var(--shell)); margin-inline: auto; }
.skip-link {
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 200;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-small);
  background: var(--color-text);
  color: var(--color-surface);
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-header);
  backdrop-filter: blur(16px);
}
.nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: var(--space-6); }
.brand { width: 82px; min-height: 48px; display: inline-flex; align-items: center; overflow: hidden; text-decoration: none; }
.brand img { width: 82px; height: auto; }
.nav-links { display: flex; align-items: center; gap: var(--space-8); }
.nav-links a { color: var(--color-muted); font-size: 14px; font-weight: 600; text-decoration: none; transition: color 160ms ease; }
.nav-links a:hover { color: var(--color-primary); }
.nav-links .nav-cta {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-button);
  background: var(--color-primary);
  color: var(--color-surface);
  box-shadow: 0 8px 18px var(--color-primary-border);
}
.nav-links .nav-cta:hover { color: var(--color-surface); transform: translateY(-1px); }

.page { padding: var(--space-10) 0 var(--space-20); }
.breadcrumbs { margin-bottom: var(--space-8); color: var(--color-muted); font-size: 13px; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: var(--space-2); margin: 0; padding: 0; list-style: none; }
.breadcrumbs li:not(:last-child)::after { content: "/"; margin-left: var(--space-2); color: var(--color-muted); opacity: 0.55; }
.breadcrumbs a { text-underline-offset: 3px; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  align-items: center;
  gap: var(--space-16);
  padding: var(--space-8) 0 var(--space-16);
}
.hero-copy { min-width: 0; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 600;
}
h1, h2, h3 { color: var(--color-text); line-height: 1.12; }
h1 { max-width: 830px; margin: var(--space-5) 0; font-size: clamp(44px, 6.5vw, 72px); font-weight: 700; letter-spacing: -0.05em; }
.lede { max-width: 790px; margin: 0; color: var(--color-muted); font-size: clamp(18px, 2.4vw, 22px); line-height: 1.55; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-4); margin-top: var(--space-8); }
.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-button);
  background: var(--color-primary);
  color: var(--color-surface);
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  box-shadow: 0 8px 18px var(--color-primary-border);
  transition: transform 160ms ease;
}
.button:hover { transform: translateY(-2px); }
.text-link { min-height: 48px; display: inline-flex; align-items: center; color: var(--color-text); font-weight: 600; text-underline-offset: 4px; }
.hero-mark {
  position: relative;
  width: 240px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 42% 58% 46% 54%;
  background: var(--color-brand);
  transform: rotate(3deg);
}
.hero-mark::before { position: absolute; inset: 12%; border: 1px solid var(--color-border); border-radius: var(--radius-large); background: var(--color-surface); content: ""; transform: rotate(-6deg); box-shadow: var(--shadow-surface); }
.hero-mark img { position: relative; z-index: 2; width: 68%; aspect-ratio: 1; border-radius: var(--radius-card); }
.hero-emoji { position: absolute; top: -14px; right: -10px; z-index: 3; width: 58px; height: 58px; display: grid; place-items: center; border-radius: var(--radius-card); background: var(--color-reward); font-size: 29px; box-shadow: var(--shadow-surface); transform: rotate(-7deg); }

.content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 244px; gap: var(--space-16); align-items: start; }
.article { min-width: 0; padding: var(--space-10); border: 1px solid var(--color-border); border-radius: var(--radius-large); background: var(--color-surface); }
.article section { padding: var(--space-10) 0; border-top: 1px solid var(--color-border); scroll-margin-top: 100px; }
.article section:first-child { padding-top: 0; border-top: 0; }
.article h2 { margin: 0 0 var(--space-5); font-size: clamp(29px, 4vw, 40px); font-weight: 700; letter-spacing: -0.035em; }
.article h3 { margin: var(--space-8) 0 var(--space-3); font-size: 22px; font-weight: 600; letter-spacing: -0.015em; }
.article p, .article ul, .article ol { margin: 0 0 var(--space-5); color: var(--color-muted); }
.article ul, .article ol { padding-left: var(--space-6); }
.article li + li { margin-top: var(--space-3); }
.article strong { color: var(--color-text); }
.article a { text-decoration-color: var(--color-primary); text-underline-offset: 4px; }
.article a:hover { text-decoration-color: var(--color-text); }
.article li::marker { color: var(--color-primary); font-weight: 700; }
.steps { counter-reset: steps; padding-left: 0 !important; list-style: none; }
.steps li { position: relative; min-height: 40px; padding-left: 52px; }
.steps li::before { position: absolute; top: 1px; left: 0; width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; background: var(--color-brand); color: var(--color-text); content: counter(steps); counter-increment: steps; font-size: 13px; font-weight: 700; }
.tip { margin: var(--space-6) 0; padding: var(--space-5) var(--space-6); border: 1px solid var(--color-primary-border); border-radius: var(--radius-card); background: var(--color-primary-soft); color: var(--color-text) !important; }

.toc { position: sticky; top: 100px; padding: var(--space-5); border: 1px solid var(--color-border); border-radius: var(--radius-card); background: var(--color-surface); box-shadow: 0 8px 24px var(--color-shadow); }
.toc strong { display: block; margin-bottom: var(--space-3); font-size: 15px; font-weight: 600; }
.toc a { display: block; padding: 6px var(--space-2); border-left: 2px solid transparent; color: var(--color-muted); font-size: 13px; line-height: 1.45; text-decoration: none; }
.toc a:hover { border-left-color: var(--color-primary); color: var(--color-text); }

.related-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4); }
.related-card { display: block; padding: var(--space-5); border: 1px solid var(--color-border); border-radius: var(--radius-card); background: var(--color-bg); text-decoration: none; transition: border-color 160ms ease, transform 160ms ease; }
.related-card:hover { border-color: var(--color-primary-border); transform: translateY(-2px); }
.related-card strong { display: block; font-size: 18px; line-height: 1.3; }
.related-card span { display: block; margin-top: var(--space-2); color: var(--color-muted); font-size: 14px; line-height: 1.55; }
.faq { display: grid; gap: var(--space-3); }
details { border: 1px solid var(--color-border); border-radius: var(--radius-button); background: var(--color-bg); }
summary { min-height: 60px; display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); padding: var(--space-4) var(--space-5); cursor: pointer; font-size: 17px; font-weight: 600; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { width: 28px; height: 28px; display: grid; flex: 0 0 auto; place-items: center; border-radius: 50%; background: var(--color-brand); content: "+"; font-size: 19px; }
details[open] summary::after { content: "−"; }
details p { margin: 0; padding: 0 var(--space-5) var(--space-5); color: var(--color-muted); }

.closing-cta { position: relative; display: grid; grid-template-columns: 1fr 126px; align-items: center; gap: var(--space-6); margin-top: var(--space-10); padding: var(--space-8); overflow: hidden; border-radius: var(--radius-large); background: var(--color-brand); }
.closing-cta::after { position: absolute; right: -42px; bottom: -70px; width: 210px; height: 210px; border-radius: 50%; background: var(--color-reward); content: ""; }
.closing-cta > div { position: relative; z-index: 2; }
.closing-cta > img { position: relative; z-index: 2; width: 118px; height: auto; aspect-ratio: 1; border-radius: var(--radius-card); box-shadow: var(--shadow-surface); transform: rotate(3deg); }
.closing-cta h2 { margin: var(--space-4) 0 var(--space-3); font-size: 32px; }
.closing-cta p { max-width: 580px; margin: 0 0 var(--space-5); color: var(--color-muted); }

.site-footer { border-top: 1px solid var(--color-border); }
.footer-inner { min-height: 140px; display: flex; align-items: center; justify-content: space-between; gap: var(--space-8); color: var(--color-muted); font-size: 13px; }
.footer-brand { display: flex; flex-direction: column; align-items: flex-start; gap: var(--space-1); }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: var(--space-5); }
.footer-links a { text-underline-offset: 3px; }

@media (max-width: 900px) {
  .hero { grid-template-columns: minmax(0, 1fr) 190px; gap: var(--space-10); }
  .hero-mark { width: 185px; }
  .content-layout { grid-template-columns: minmax(0, 1fr) 210px; gap: var(--space-8); }
  .article { padding: var(--space-8); }
}

@media (max-width: 760px) {
  .nav, .page, .footer-inner { width: min(calc(100% - 40px), var(--shell)); }
  .nav { min-height: 68px; }
  .nav-links a:not(.nav-cta) { display: none; }
  .page { padding-top: var(--space-6); }
  .breadcrumbs { margin-bottom: var(--space-5); }
  .hero { grid-template-columns: 1fr; gap: var(--space-8); padding: var(--space-5) 0 var(--space-12); }
  .hero-mark { width: 170px; grid-row: 1; justify-self: center; }
  .hero-copy { grid-row: 2; text-align: center; }
  .lede { margin-inline: auto; }
  .hero-actions { justify-content: center; }
  .content-layout { grid-template-columns: 1fr; }
  .toc { display: none; }
  .related-grid { grid-template-columns: 1fr; }
  .footer-inner { padding: var(--space-8) 0; align-items: flex-start; flex-direction: column; }
  .footer-links { justify-content: flex-start; }
}

@media (max-width: 520px) {
  body { font-size: 16px; }
  .article { padding: var(--space-6) var(--space-5); }
  .hero h1 { font-size: clamp(40px, 12vw, 56px); }
  .hero-actions .button { width: 100%; }
  .closing-cta { grid-template-columns: 1fr; padding: var(--space-6); text-align: center; }
  .closing-cta > img { display: none; }
  .closing-cta .button { width: 100%; }
  .footer-links { display: grid; grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}