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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg-primary);
  color: var(--color-text-secondary);
  line-height: 1.6;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
  line-height: 1.3;
  font-weight: 600;
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

p { margin-bottom: var(--space-4); }

a {
  color: var(--color-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-accent); }

img { max-width: 100%; height: auto; display: block; }

ul, ol { list-style: none; }

code, pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

pre {
  background: var(--color-bg-primary);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: var(--space-4);
  overflow-x: auto;
  line-height: 1.7;
}

code {
  background: rgba(255,255,255,0.06);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--color-cyan);
}

pre code {
  background: none;
  padding: 0;
  color: var(--color-text-secondary);
}

::selection {
  background: rgba(59,130,246,0.3);
  color: var(--color-text-primary);
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.25); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-20) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-4);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-tertiary);
  max-width: 600px;
  margin: 0 auto var(--space-12);
}

.gradient-text {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

@media (max-width: 768px) {
  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }
  h3 { font-size: var(--text-xl); }
  .section { padding: var(--space-12) 0; }
}