@font-face {
  font-family: 'Geist Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url('/fonts/geist-cyrillic-ext-wght-normal.woff2') format('woff2-variations');
  unicode-range: U+0460-052F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F;
}
@font-face {
  font-family: 'Geist Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url('/fonts/geist-cyrillic-wght-normal.woff2') format('woff2-variations');
  unicode-range: U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116;
}
@font-face {
  font-family: 'Geist Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url('/fonts/geist-vietnamese-wght-normal.woff2') format('woff2-variations');
  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: 'Geist Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url('/fonts/geist-latin-ext-wght-normal.woff2') format('woff2-variations');
  unicode-range: U+0100-02AF,U+0304,U+0308,U+0329,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
  font-family: 'Geist Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url('/fonts/geist-latin-wght-normal.woff2') format('woff2-variations');
  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+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}

:root {
  --bg: #0a0a0a;
  --surface: #111111;
  --border: #1e1e1e;
  --accent: #22c55e;
  --text: #e0e0e0;
  --text-dim: #666666;
  --font-body: 'Geist Variable', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Geist Variable', ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  font-family: var(--font-body);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 4rem 2rem 6rem;
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3rem;
}

.back {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s ease;
}
.back:hover { color: var(--text); }

.lang-switch {
  display: flex;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}
.lang-switch button {
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  transition: color 0.2s, background 0.2s;
}
.lang-switch button:hover { color: var(--text); }
.lang-switch button.active {
  color: var(--accent);
  background: rgba(74, 144, 164, 0.1);
  pointer-events: none;
}

h1 {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 0.5rem;
}

.updated {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 3rem;
}

h2 {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

p, li {
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 1rem;
}

ul { padding-left: 1.5rem; margin-bottom: 1rem; }
li { margin-bottom: 0.5rem; }

a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 2px;
}
a:hover { color: #fff; }

.contact {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--text-dim);
}
.contact a { color: var(--text); }

div[lang] { display: none; }
div[lang].active { display: block; }

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--surface);
  padding: 0.1em 0.3em;
  border-radius: 3px;
  border: 1px solid var(--border);
}