body{
    margin:0;
    font-family:Segoe UI;
    background:#f5f7fb;   /* WHITE THEME BACKGROUND */
    padding:0px;
    color:#222;
}

.container{
    max-width:1200px;
    margin:auto;
}

h2{
    text-align:center;
    margin-bottom:20px;
    color:#222;
}

/* ===== UPLOAD BOX ===== */
.upload-box{
    display:flex;
    justify-content:center;
    align-items:center;
    text-align:center;
    padding:70px;
    border:2px dashed #bbb;
    border-radius:16px;
    max-width:700px;
    margin:30px auto;
    cursor:pointer;
    font-size:18px;
    background:#ffffff;   /* WHITE */
    color:#333;
    transition:0.3s;
    box-shadow:0 5px 15px rgba(0,0,0,0.05);
}

.upload-box:hover{
    background:#f0f8ff;
    border-color:#007bff;
}

.upload-box input{
    display:none;
}

/* ===== GRID ===== */
.grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:20px;
}

/* ===== CARD ===== */
.card{
    background:#ffffff;
    color:#333;
    padding:15px;
    border-radius:16px;
    box-shadow:0 8px 20px rgba(0,0,0,0.08);
}

/* HEADER */
.header{
    display:flex;
    justify-content:space-between;
    align-items:center;
    margin-bottom:10px;
}

.header h3{
    margin:0;
    font-size:16px;
    color:#222;
}

/* BUTTONS */
button{
    margin:3px;
    padding:8px 12px;
    border:none;
    border-radius:6px;
    cursor:pointer;
    font-weight:bold;
    transition:0.2s;
}

.full{background:#ff9800;color:#fff;}
.copy{background:#007bff;color:#fff;}
.download{background:#6f42c1;color:#fff;}
.clear{background:#dc3545;color:#fff;}

button:hover{
    opacity:0.85;
}

/* VIEWER */
iframe{
    width:100%;
    height:520px;
    border-radius:10px;
    border:1px solid #ddd;
    background:#fff;
}

/* OUTPUT */
.output{
    height:460px;
    overflow:auto;
    background:#ffffff;
    padding:10px;
    border-radius:10px;
    white-space:pre-wrap;
    border:1px solid #ddd;
}