:root {
  --usi-red: #EF0C1D;
  --usi-blue: #1A0A4F;
  --text-dark: #333333;
  --bg-white: #ffffff;
  --bg-grey: #f0f0f0;
}
* { box-sizing: border-box; margin:0; padding:0; }
body { font-family: sans-serif; color: var(--text-dark); background: var(--bg-white); }
.container { width:90%; max-width:900px; margin: auto; padding:1rem; }
header { background: var(--usi-blue); color:white; }
header .container { display:flex; align-items:center; justify-content:space-between; padding:1rem 0; }
.header-logos img { height:50px; margin-right:1rem; }
nav a { color:white; text-decoration:none; margin:0 0.5rem; }
nav a.active { font-weight:bold; text-decoration:underline; }
.btn { display:inline-block; background:var(--usi-red); color:white; padding:0.6rem 1.2rem; border-radius:4px; margin:0.5rem 0; text-decoration:none; }
main { padding:2rem 0; }
footer { background: var(--bg-grey); text-align:center; padding:1rem 0; font-size:0.9rem; }
.form-group { margin-bottom:1rem; }
.form-group label { display:block; margin-bottom:0.25rem; font-weight:500; }
.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="file"],
.form-group textarea { width:100%; padding:0.5rem; border:1px solid #ccc; border-radius:4px; }
.form-group input[type="checkbox"] { margin-right:0.5rem; }