*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:"Segoe UI","Open Sans",Roboto,Arial,sans-serif;background:#3b46c4;color:#fff}
.center{min-height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2.5rem;padding:2rem}
.logo{position:relative;display:inline-block;line-height:1}
.brand{display:flex;flex-direction:column;align-items:center;gap:1.1rem}
.tagline{font-size:clamp(.85rem,2.2vw,1rem);font-weight:400;letter-spacing:.04em;color:rgba(255,255,255,.72);text-align:center}
.word{font-weight:700;font-size:clamp(3.5rem,12vw,6.5rem);letter-spacing:-.01em}
.plus{position:absolute;right:-.42em;bottom:-.28em;width:.34em;height:.34em;fill:#fff;font-size:clamp(3.5rem,12vw,6.5rem)}
form{display:flex;flex-direction:column;align-items:center;gap:.9rem;width:min(300px,100%);margin-top:.5rem}
input{width:100%;padding:.85rem 1rem;border:1px solid rgba(255,255,255,.35);border-radius:6px;background:rgba(255,255,255,.1);color:#fff;font-size:1rem;text-align:center;outline:none}
input::placeholder{color:rgba(255,255,255,.65)}
input:focus{border-color:#fff;background:rgba(255,255,255,.16)}
button{width:100%;padding:.85rem 1rem;border:0;border-radius:6px;background:#fff;color:#3b46c4;font-weight:600;font-size:1rem;cursor:pointer}
button:hover{background:#e9ebfa}
.err{color:#ffd0d0;font-size:.9rem;text-align:center}
.blank{background:#fff}
.logout{position:fixed;top:1rem;right:1.25rem;color:#3b46c4;font-size:.9rem;text-decoration:none}