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

:root {
  --bg: #0a0a0a;
  --fg: #ffffff;
  --muted: rgba(255, 255, 255, 0.6);
  --subtle: rgba(255, 255, 255, 0.4);
  --hairline: rgba(255, 255, 255, 0.08);
  --hairline-strong: rgba(255, 255, 255, 0.14);
  --accent: #34d399;
  --max-content: 720px;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  color: var(--fg);
  background-color: var(--bg);
  min-height: 100vh;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a {
  color: var(--fg);
  text-decoration: none;
  transition: color 160ms ease, opacity 160ms ease;
}

a:hover,
a:focus-visible {
  color: var(--accent);
}

a:focus-visible {
  outline: 1px solid var(--hairline-strong);
  outline-offset: 4px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 16px;
  padding: 8px 12px;
  background: var(--fg);
  color: var(--bg);
  border-radius: 4px;
  font-size: 0.85rem;
  z-index: 100;
}

.skip-link:focus {
  top: 16px;
  color: var(--bg);
}

.utility-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 22px;
  padding: 10px 24px;
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.02em;
  border-bottom: 1px solid var(--hairline);
  background: rgba(255, 255, 255, 0.015);
}

.utility-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  text-decoration: none;
  transition: color 160ms ease;
}

.utility-item[href]:hover,
.utility-item[href]:focus-visible {
  color: var(--fg);
}

.utility-item svg {
  width: 14px;
  height: 14px;
  opacity: 0.7;
  flex-shrink: 0;
}

@media (max-width: 600px) {
  .utility-bar {
    gap: 4px 14px;
    padding: 8px 16px;
    font-size: 0.72rem;
  }
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  border-bottom: 1px solid var(--hairline);
  background: rgba(10, 10, 10, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header .brand {
  display: inline-flex;
  align-items: center;
  height: 32px;
}

.site-header .brand img {
  height: 28px;
  width: auto;
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 0.85rem;
  color: var(--muted);
}

.site-header nav a {
  color: var(--muted);
}

.site-header nav a:hover,
.site-header nav a:focus-visible {
  color: var(--fg);
}

.article {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 80px 24px 96px;
  animation: fadeUp 600ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.article header {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--hairline);
}

.article h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 12px;
}

.article .meta {
  font-size: 0.85rem;
  color: var(--subtle);
  letter-spacing: 0.02em;
  margin: 0;
}

.article h2 {
  font-size: clamp(1.15rem, 1.8vw, 1.35rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 56px 0 16px;
  color: var(--fg);
}

.article h2:first-of-type {
  margin-top: 0;
}

.article h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 32px 0 12px;
  color: var(--fg);
}

.article p,
.article li {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--muted);
}

.article p {
  margin: 0 0 16px;
}

.article ul,
.article ol {
  margin: 0 0 16px;
  padding-left: 22px;
}

.article li {
  margin-bottom: 8px;
}

.article strong {
  color: var(--fg);
  font-weight: 600;
}

.article a {
  color: var(--fg);
  border-bottom: 1px solid var(--hairline-strong);
  padding-bottom: 1px;
}

.article a:hover,
.article a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.todo {
  display: block;
  padding: 12px 16px;
  margin: 16px 0;
  font-size: 0.85rem;
  color: var(--subtle);
  border: 1px dashed var(--hairline-strong);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.02);
}

.todo::before {
  content: 'TODO · ';
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 14px;
  padding: 32px 24px;
  border-top: 1px solid var(--hairline);
  font-size: 0.8rem;
  color: var(--subtle);
  letter-spacing: 0.02em;
}

.site-footer a {
  color: var(--muted);
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--fg);
}

.site-footer .sep {
  opacity: 0.5;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@media (max-width: 480px) {
  .site-header {
    padding: 14px 20px;
  }
  .site-header nav {
    gap: 16px;
    font-size: 0.8rem;
  }
  .article {
    padding: 56px 20px 72px;
  }
  .site-footer {
    padding: 24px 20px;
  }
}