*{
    box-sizing:border-box;
}

html,body{
    margin:0;
    padding:0;
    min-height:100%;
}

body{
    font-family:Arial,Helvetica,sans-serif;
    background:#1e293b;
    color:white;
}

/* =========================
   GLOBAL PANEL
========================= */
.sidebar{
    width:200px;
    position:fixed;
    top:0;
    left:0;
    height:100%;
    background:#0f172a;
    padding:20px;
}

.sidebar a{
    display:block;
    color:white;
    margin:10px 0;
    text-decoration:none;
}

.content{
    margin-left:220px;
    padding:30px;
}

/* =========================
   LOGIN
========================= */
.login-bg{
    min-height:100vh;
    display:flex;
    align-items:center;
    justify-content:center;
    padding:20px;

    background:
        radial-gradient(circle at top left, rgba(37,99,235,.18), transparent 30%),
        radial-gradient(circle at bottom right, rgba(59,130,246,.12), transparent 30%),
        linear-gradient(180deg,#0b1220 0%, #0f172a 100%);
}

/* BOX */
.login-box{
    width:100%;
    max-width:420px;

    background:#111b2e;
    border:1px solid #1f2937;
    border-radius:20px;

    padding:32px 28px;

    box-shadow:
        0 25px 70px rgba(0,0,0,.45),
        inset 0 1px 0 rgba(255,255,255,.04);

    color:#e5e7eb;
}

/* TITLE */
.login-box h2{
    margin:0 0 24px;
    text-align:center;
    font-size:26px;
    font-weight:700;
    color:#fff;
}

/* INPUT */
.login-box input{
    width:100%;
    height:48px;

    margin-bottom:14px;

    border-radius:12px;
    border:1px solid #1f2937;

    background:#0f172a;
    color:#fff;

    padding:0 14px;
    font-size:14px;

    transition:.18s;
}

.login-box input::placeholder{
    color:#94a3b8;
}

.login-box input:focus{
    border-color:#2563eb;
    box-shadow:0 0 0 3px rgba(37,99,235,.15);
    outline:none;
}

/* BUTTON */
.login-box button{
    width:100%;
    height:48px;

    border:none;
    border-radius:12px;

    background:linear-gradient(135deg,#2563eb,#1d4ed8);

    color:#fff;
    font-weight:700;
    font-size:14px;

    cursor:pointer;
    transition:.18s;
}

.login-box button:hover{
    transform:translateY(-1px);
    box-shadow:0 6px 18px rgba(37,99,235,.35);
}

/* ERROR */
.err{
    margin-bottom:14px;

    background:#450a0a;
    border:1px solid rgba(248,113,113,.2);

    color:#fecaca;

    padding:12px 14px;
    border-radius:12px;

    font-size:13px;
    text-align:center;
}

/* MOBILE */
@media(max-width:480px){

.login-box{
padding:24px 20px;
border-radius:18px;
}

.login-box h2{
font-size:22px;
}

.login-box input{
height:44px;
}

.login-box button{
height:44px;
}

}
/* =========================
   CHAT LAYOUT LAMA
========================= */
.chat-layout{
    display:flex;
    height:90vh;
}

.chat-users{
    width:300px;
    background:#111;
    overflow:auto;
}

.chat-user{
    padding:15px;
    border-bottom:1px solid #333;
    cursor:pointer;
}

.chat-user:hover{
    background:#222;
}

.chat-box{
    flex:1;
    display:flex;
    flex-direction:column;
}

#messages{
    flex:1;
    padding:20px;
    overflow:auto;
}

.msg{
    padding:10px;
    margin:5px;
    border-radius:6px;
    max-width:60%;
    word-break:break-word;
}

.user{
    background:#333;
}

.admin{
    background:#2563eb;
    margin-left:auto;
}

.chat-send{
    display:flex;
    padding:10px;
    background:#111;
    gap:10px;
}

.chat-send input{
    flex:1;
    padding:10px;
    min-width:0;
}

.chat-send button{
    padding:10px 20px;
}

/* =========================
   RESPONSIVE
========================= */
@media (max-width:768px){
    .sidebar{
        width:100%;
        height:auto;
        position:relative;
        padding:14px 16px;
    }

    .content{
        margin-left:0;
        padding:16px;
    }

    .login-bg{
        padding:16px;
    }

    .login-box{
        max-width:100%;
        padding:22px 18px;
        border-radius:18px;
    }

    .login-box h2{
        font-size:24px;
        margin-bottom:18px;
    }

    .chat-layout{
        flex-direction:column;
        height:auto;
        min-height:100vh;
    }

    .chat-users{
        width:100%;
        max-height:240px;
    }

    .msg{
        max-width:85%;
    }

    .chat-send{
        flex-wrap:wrap;
    }

    .chat-send input{
        width:100%;
        flex:1 1 100%;
    }

    .chat-send button{
        width:100%;
    }
}

@media (max-width:480px){
    .login-box{
        padding:18px 14px;
        border-radius:16px;
    }

    .login-box h2{
        font-size:21px;
    }

    .login-box input{
        height:44px;
        font-size:13px;
        padding:0 12px;
    }

    .login-box button{
        height:44px;
        font-size:13px;
    }

    .err{
        font-size:12px;
        padding:10px 12px;
    }

    .content{
        padding:12px;
    }

    .msg{
        max-width:92%;
    }
}