/* Minimal styling for ML4U */
:root{ --bg:#0b0e14; --fg:#e6e6e6; --muted:#b0b0b0; --brand:#4da3ff; }
*{ box-sizing:border-box; }
html,body{ margin:0; padding:0; background:var(--bg); color:var(--fg); font:16px/1.6 -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica, Arial, sans-serif; }
.container{ max-width:1100px; margin:0 auto; padding:1rem; }
.site-header{ background:#0f131b; border-bottom:1px solid #1c2230; }
.site-title{ margin:0; font-size:1.25rem; }
.site-title a{ color:var(--fg); text-decoration:none; }
.site-nav a{ color:var(--muted); margin-left:1rem; text-decoration:none; }
.site-nav a:hover{ color:var(--brand); }
.content h1, .content h2, .content h3{ color:#fff; }
.content a{ color:var(--brand); }
.chapters ul{ list-style:none; padding:0; }
.chapters li{ margin:0.25rem 0; }
.site-footer{ border-top:1px solid #1c2230; margin-top:2rem; padding:1rem 0; color:var(--muted); }