:root{
    --drc-blue:#00A3E0;
    --drc-dark-blue:#003DA5;
    --drc-yellow:#FFD100;
    --drc-red:#CE1126;
    --white:#ffffff;
    --light-bg:#f8fafc;
    --dark-text:#0f172a;
    --muted-text:#64748b;
    --border:#e2e8f0;
}

*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{
    min-height:100vh;
    font-family:Arial, sans-serif;
    background:#f8fafc;
    display:flex;
    align-items:center;
    justify-content:center;
    overflow:hidden;
    position:relative;
}

/* DRC flag shadow */
body::before{
    content:"";
    position:absolute;
    width:160%;
    height:120px;
    background:var(--drc-yellow);
    top:54%;
    left:-35%;
    transform:rotate(-25deg);
    opacity:0.22;
    z-index:0;
    box-shadow:0 0 70px rgba(255,209,0,0.35);
}

body::after{
    content:"";
    position:absolute;
    width:160%;
    height:45px;
    background:var(--drc-red);
    top:57%;
    left:-35%;
    transform:rotate(-25deg);
    opacity:0.20;
    z-index:0;
}

.login-container{
    position:relative;
    z-index:2;
    width:92%;
    max-width:430px;
}

.login-card{
    background:rgba(255,255,255,0.92);
    backdrop-filter:blur(14px);
    border:1px solid rgba(0,61,165,0.12);
    border-radius:28px;
    padding:42px;
    box-shadow:0 30px 80px rgba(15,23,42,0.16);
    text-align:center;
}

.login-logo{
    width:64px;
    height:64px;
    margin:0 auto 18px;
    border-radius:20px;
    background:linear-gradient(135deg,var(--drc-blue),var(--drc-dark-blue));
    color:var(--drc-yellow);
    display:flex;
    align-items:center;
    justify-content:center;
    font-size:34px;
    box-shadow:0 14px 30px rgba(0,61,165,0.25);
}

.login-card h1{
    color:var(--drc-dark-blue);
    font-size:30px;
    margin-bottom:8px;
}

.login-card p{
    color:var(--muted-text);
    margin-bottom:28px;
    line-height:1.5;
}

.error-message{
    background:#fee2e2;
    color:#991b1b;
    padding:13px 16px;
    border-radius:12px;
    margin-bottom:20px;
    font-size:14px;
    border:1px solid #fecaca;
}

.form-group{
    text-align:left;
    margin-bottom:18px;
}

.form-group label{
    display:block;
    font-weight:bold;
    color:var(--dark-text);
    margin-bottom:8px;
    font-size:14px;
}

.form-group input{
    width:100%;
    padding:15px 16px;
    border:1px solid var(--border);
    border-radius:14px;
    font-size:15px;
    outline:none;
    background:white;
    transition:0.25s ease;
}

.form-group input:focus{
    border-color:var(--drc-blue);
    box-shadow:0 0 0 4px rgba(0,163,224,0.12);
}

button{
    width:100%;
    border:none;
    padding:16px;
    border-radius:15px;
    background:var(--drc-dark-blue);
    color:white;
    font-size:16px;
    font-weight:bold;
    cursor:pointer;
    box-shadow:0 14px 32px rgba(0,61,165,0.28);
    transition:0.25s ease;
}

button:hover{
    background:var(--drc-blue);
    transform:translateY(-2px);
}

.login-footer{
    margin-top:24px;
    font-size:13px;
    color:var(--muted-text);
}

@media(max-width:500px){
    .login-card{
        padding:32px 24px;
    }
}