*{box-sizing:border-box}
body{margin:0;min-height:100vh;font-family:Arial,sans-serif;background:#f4f7fb;color:#1f2937;display:flex;align-items:center;justify-content:center}
.login-container{width:100%;padding:20px}
.login-card{width:100%;max-width:420px;margin:auto;background:#fff;border-radius:14px;padding:40px;box-shadow:0 10px 30px rgba(0,0,0,.08)}
.brand{text-align:center;margin-bottom:32px}
.brand-icon{width:58px;height:58px;margin:0 auto 14px;border-radius:14px;background:#1976d2;color:#fff;display:flex;align-items:center;justify-content:center;font-size:30px;font-weight:bold}
.brand h1{margin:0;font-size:27px}
.brand p{margin:7px 0 0;color:#6b7280}
label{display:block;margin:18px 0 7px;font-weight:600;font-size:14px}
input{width:100%;padding:12px 13px;border:1px solid #d1d5db;border-radius:8px;font-size:16px;outline:none}
input:focus{border-color:#1976d2}
button{width:100%;margin-top:24px;padding:13px;border:0;border-radius:8px;background:#1976d2;color:#fff;font-size:16px;font-weight:600;cursor:pointer}
button:hover{background:#1565c0}
button:disabled{opacity:.65;cursor:wait}
.error{min-height:20px;margin-top:14px;color:#c62828;text-align:center;font-size:14px}