:root{
  --navy: #0a0f14;
  --navy-2: #121a22;
  --teal: #2dd4bf;
  --teal-dim: #1a3d38;
  --bg: #fbfcfc;
  --text: #16212b;
  --muted: #5c6b76;
  --line: #e4e9ec;
  --max: 720px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg: #0a0f14;
    --text: #e9eef2;
    --muted: #8b98a5;
    --line: #1e2a34;
    color-scheme: dark;
  }
}
:root[data-theme="dark"]{
  --bg: #0a0f14;
  --text: #e9eef2;
  --muted: #8b98a5;
  --line: #1e2a34;
  color-scheme: dark;
}

*{ box-sizing: border-box; }

html{ -webkit-text-size-adjust: 100%; }

body{
  margin:0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

.sr-only{
  position:absolute; width:1px; height:1px; overflow:hidden;
  clip:rect(0,0,0,0); white-space:nowrap; border:0; padding:0; margin:-1px;
}

a{ color: var(--teal); }

/* Header */
.site-header{
  background: var(--navy);
  border-bottom: 1px solid #1e2a34;
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner{
  max-width: 960px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand{
  display: flex;
  align-items: center;
  gap: 8px;
  color: #e9eef2;
  text-decoration: none;
  font-weight: 700;
  font-size: 15px;
  flex: none;
}
.brand svg{ width: 22px; height: 22px; color: var(--teal); }

.site-nav{
  display: flex;
  gap: 4px;
  flex: 1;
  flex-wrap: wrap;
}
.site-nav a{
  color: #b7c2cb;
  text-decoration: none;
  font-size: 14px;
  padding: 8px 12px;
  border-radius: 8px;
  transition: color .15s, background .15s;
}
.site-nav a:hover{ color: #e9eef2; background: rgba(255,255,255,.06); }
.site-nav a.active{ color: var(--teal); background: var(--teal-dim); }
.site-nav a.site-nav-home{
  margin-left: auto;
  color: var(--teal);
  border: 1px solid #2dd4bf33;
}
.site-nav a.site-nav-home:hover{ background: var(--teal-dim); }

.theme-toggle{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  flex: none;
  border-radius: 999px;
  border: 1px solid #263340;
  background: rgba(255,255,255,.08);
  color: #e9eef2;
  cursor: pointer;
  transition: background .15s;
}
.theme-toggle:hover{ background: rgba(255,255,255,.14); }
.theme-toggle svg{ width: 16px; height: 16px; }
.theme-toggle .icon-sun{ display: none; }
.theme-toggle .icon-moon{ display: block; }
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) .theme-toggle .icon-sun{ display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon{ display: none; }
}
:root[data-theme="dark"] .theme-toggle .icon-sun{ display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon{ display: none; }

.lang-switcher{ position: relative; flex: none; }
.lang-toggle{
  font-family: inherit;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: #e9eef2;
  background: rgba(255,255,255,.08);
  border: 1px solid #263340;
  border-radius: 999px;
  padding: 7px 14px;
  cursor: pointer;
}
.lang-toggle:hover{ background: rgba(255,255,255,.14); }
.lang-menu{
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  background: var(--navy-2);
  border: 1px solid #263340;
  border-radius: 10px;
  padding: 6px;
  min-width: 160px;
  box-shadow: 0 12px 30px -10px rgba(0,0,0,.5);
}
.lang-switcher.open .lang-menu{ display: block; }
.lang-menu a{
  display: block;
  padding: 7px 10px;
  border-radius: 6px;
  color: #cdd6dc;
  text-decoration: none;
  font-size: 13.5px;
}
.lang-menu a:hover{ background: rgba(255,255,255,.06); color: #fff; }
.lang-menu a.active{ color: var(--teal); }

/* Content */
.content{
  max-width: var(--max);
  margin: 0 auto;
  padding: 56px 20px 80px;
}
.content h1{
  font-size: clamp(28px, 4vw, 36px);
  line-height: 1.2;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.content h2{
  font-size: 20px;
  margin: 40px 0 12px;
  padding-top: 4px;
  border-top: 1px solid var(--line);
  padding-top: 24px;
}
.content h2:first-of-type{ border-top: none; padding-top: 0; }
.content p{ margin: 0 0 16px; color: var(--text); }
.content p.lead{
  font-size: 18px;
  color: var(--muted);
  margin-bottom: 32px;
}
.content ul{ margin: 0 0 16px; padding-left: 22px; }
.content li{ margin-bottom: 8px; }
.content strong{ color: var(--text); }
.content em{ font-style: normal; color: var(--teal); font-weight: 600; }

/* Footer */
.site-footer{
  background: var(--navy);
  color: #8b98a5;
  font-size: 13px;
}
.footer-inner{
  max-width: 960px;
  margin: 0 auto;
  padding: 22px 20px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

@media (max-width: 640px){
  .header-inner{ flex-wrap: wrap; }
  .site-nav{ order: 3; width: 100%; }
}