:root{
    --blue:#3498db;
    --blue-dark:#2980b9;
    --bg:#f4f7fb;
    --card:#ffffff;
  }
  *{box-sizing:border-box}
  body{
    margin:0;
    font-family:'Poppins',system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
    background:var(--bg);
    color:#17222a;
    min-height:100vh;
  }
  
  /* header */
  .topbar{
    display:flex;
    align-items:center;
    gap:12px;
    padding:14px 20px;
    background:var(--blue);
    color:white;
  }
  .brand-logo{
    width:50px;
    height:auto;
    display:block;
    object-fit:contain;
    max-height:56px;
  }
  .brand-name{font-weight:600;font-size:20px}
  
  /* layout + form */
  main{
    display:flex;
    justify-content:center;
    align-items:flex-start;
    padding:40px;
    min-height:calc(100vh - 72px);
  }
  .form-section{
    background:#fff;
    padding:30px;
    border-radius:12px;
    box-shadow:0 6px 18px rgba(0,0,0,0.08);
    width:100%;
    max-width:480px;
    text-align:center;
  }
  .form-section h2{margin:0 0 12px;color:#34495e}
  label{display:block;margin-top:12px;font-weight:600;text-align:left}
  input{width:100%;padding:12px;margin-top:6px;border:1px solid #ccd1d9;border-radius:8px;font-size:14px}
  button{margin-top:20px;width:100%;padding:14px;background:var(--blue);color:#fff;border:0;border-radius:8px;font-weight:700;cursor:pointer}
  button:hover{background:var(--blue-dark)}
  .message{padding:10px;border-radius:8px;margin-bottom:12px;font-weight:600}
  .message.success{background:#ecffef;border:1px solid #b9f7c2;color:#0a5c2c}
  .message.error{background:#ffecec;border:1px solid #ffbdbd;color:#8b0000}  

  .link{margin-top:14px;text-align:center}
  .link a{color:var(--blue);text-decoration:none}