@font-face {
  font-family: "Inter"; font-style: normal; font-weight: 100 900; font-display: swap;
  src: url("../assets/fonts/inter-vietnamese.woff2") format("woff2");
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}
@font-face {
  font-family: "Inter"; font-style: normal; font-weight: 100 900; font-display: swap;
  src: url("../assets/fonts/inter-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); }
body {
  margin: 0; font-family: var(--font-sans); font-size: var(--fs-450); line-height: var(--lh-body);
  color: var(--ink-700); background: var(--surface); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}
img, svg, video { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 { color: var(--ink-900); line-height: var(--lh-tight); margin: 0 0 var(--sp-4); font-weight: 700; letter-spacing: -0.015em; }
h1 { font-size: var(--fs-900); letter-spacing: -0.025em; }
h2 { font-size: var(--fs-800); }
h3 { font-size: var(--fs-600); line-height: var(--lh-snug); }
p { margin: 0 0 var(--sp-4); }
a { color: var(--brand-600); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--brand-700); }
ul, ol { margin: 0 0 var(--sp-4); padding-left: 1.25rem; }
hr { border: 0; border-top: 1px solid var(--line); margin: var(--sp-8) 0; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 4px; }
main:focus { outline: none; }
::selection { background: var(--brand-100); color: var(--brand-900); }

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.container-narrow { max-width: var(--container-narrow); }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; left: var(--sp-4); top: -100px; z-index: 200; background: var(--brand-800); color: #fff; padding: var(--sp-3) var(--sp-4); border-radius: var(--r-sm); }
.skip-link:focus { top: var(--sp-3); color: #fff; }

/* long-form content */
.prose { max-width: 72ch; }
.prose > :first-child { margin-top: 0; }
.prose h2 { font-size: var(--fs-700); margin-top: var(--sp-12); padding-top: var(--sp-2); letter-spacing: -0.01em; }
.prose h3 { margin-top: var(--sp-8); }
.prose li { margin-bottom: var(--sp-2); }
.prose li::marker { color: var(--brand-500); }
.prose .lead { font-size: var(--fs-500); color: var(--ink-900); line-height: 1.6; }
.prose ul.checklist { list-style: none; padding: 0; }
.prose ul.checklist li { position: relative; padding: var(--sp-4) var(--sp-4) var(--sp-4) 3rem; background: var(--brand-50); border-radius: var(--r-md); margin-bottom: var(--sp-3); }
.prose ul.checklist li::before { content: ""; position: absolute; left: var(--sp-4); top: 1.2rem; width: 1.25rem; height: 1.25rem; border-radius: 50%; background: var(--brand-600) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 12.5l4 4 8-9'/%3E%3C/svg%3E") center/70% no-repeat; }
.figure { margin: var(--sp-8) auto; max-width: 720px; text-align: center; }
.figure img { margin-inline: auto; border-radius: var(--r-md); box-shadow: var(--shadow-md); background: var(--surface-alt); }
.figure-wide { max-width: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
}