:root{
  --bg:#ffffff;         /* white */
  --brand:#002855;      /* navy */
  --muted:#4b5563;      /* gray */
}

/* Reset */
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--brand)}

/* Layout container */
.container{max-width:960px;margin:0 auto;padding:0 24px}

/* HEADER */
.header{background:var(--bg);border-bottom:1px solid rgba(0,0,0,.1)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px}

/* Logo */
.logo{font-weight:800;font-size:1.6rem;color:var(--brand);text-decoration:none}

/* Nav links */
.nav .links{display:flex;align-items:center;gap:22px;flex-wrap:wrap}
.nav .links a{
  margin:0;
  padding:8px 10px;
  border-radius:10px;
  color:var(--brand);
  font-weight:700;
  text-decoration:none;
}
.nav .links a:hover{background:rgba(0,0,0,.05)}
.nav .links a[aria-current="page"]{text-decoration:underline}

/* Hero / sections */
.hero{text-align:center;padding:60px 20px}
.hero h1{font-size:2.5rem;margin:0 0 12px}
.hero p{color:var(--muted);margin:0 0 24px}

/* Buttons */
.btn{display:inline-block;padding:10px 20px;border-radius:8px;background:var(--brand);color:#fff;text-decoration:none}
.btn:hover{background:#001f40}

/* Footer */
.footer{border-top:1px solid rgba(0,0,0,.1);text-align:center;padding:20px 0;margin-top:40px;color:var(--brand)}

/* Form fields */
.input{width:100%;padding:12px 14px;margin:6px 0 14px;border:1px solid rgba(0,0,0,.12);border-radius:10px;background:#fff;color:var(--brand);font-size:16px}
.btn-full{display:inline-block;width:100%;padding:12px 16px;border-radius:10px;border:0;background:var(--brand);color:#fff;font-weight:600;cursor:pointer}
.btn-full:active{transform:translateY(1px)}

/* Card for sign in */
.auth-card{max-width:480px;margin:32px auto 0;background:#f9fafb;border:1px solid rgba(0,0,0,.08);border-radius:16px;padding:24px}

/* Mobile tweaks */
@media (max-width:640px){
  .container{padding:0 12px}
  .nav{flex-wrap:wrap}
  .nav .links{
    width:100%;
    justify-content:center;
    gap:16px;
    padding:6px 0 10px;
  }
}