body{font-family:Arial;background:#f4f6f8;display:flex;flex-direction:column;align-items:center}
.container{background:#fff;padding:20px;width:90%;max-width:900px;border-radius:10px;box-shadow:0 4px 12px rgba(0,0,0,.1);margin:20px}.container {
    max-width: 950px;
    margin: 40px auto;
    background: white;
    padding: 35px;
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.05);
}

.nav{display:flex;gap:10px;margin:20px}
.nav a{text-decoration:none;padding:6px 12px;background:#e9ecef;border-radius:5px;color:#000}
.nav a:hover{background:#0d6efd;color:#fff}
input,button{width:100%;margin:10px 0}
button{background:#0d6efd;color:#fff;border:none;padding:10px;border-radius:5px}
canvas{max-width:100%;border:1px dashed #ccc;margin:10px 0}
.row{display:flex;gap:10px}
/* ===== NAVIGATION BUTTON FIX ===== */

 
.nav-container{
    display:flex;
    flex-wrap:wrap;
    gap:10px;
    padding:15px;
    background:#fff;
    justify-content:center;
}

.nav-container a{
    padding:10px 18px;
    background:#e9edf5;
    text-decoration:none;
    border-radius:8px;
    color:#000;
    font-weight:500;
    transition:0.3s;
}

.nav-container a:hover{
    background:#d6dbe6;
}

.nav-container a.active{
    background:#2f5fd7;
    color:#fff;
}
/* ===== Modern Tool Styling ===== */

body{
    font-family: 'Inter', Arial, sans-serif;
    background: linear-gradient(180deg,#f6f8fb,#eef2f7);
}

/* Container upgrade */
.container{
    max-width:950px;
    margin:40px auto;
    background:#ffffff;
    padding:40px;
    border-radius:20px;
    box-shadow:0 15px 40px rgba(0,0,0,0.06);
}

/* Headings */
h1{
    font-size:36px;
    font-weight:700;
    margin-bottom:15px;
}

.container p{
    color:#555;
    line-height:1.6;
}

/* File input modern style */
input[type="file"]{
    padding:14px;
    border:2px dashed #cfd8e3;
    border-radius:12px;
    background:#f9fbff;
    cursor:pointer;
}

/* Range slider modern */
input[type="range"]{
    -webkit-appearance:none;
    height:6px;
    border-radius:5px;
    background:#dbe4f0;
    outline:none;
}

input[type="range"]::-webkit-slider-thumb{
    -webkit-appearance:none;
    width:18px;
    height:18px;
    border-radius:50%;
    background:#2f5fd7;
    cursor:pointer;
    box-shadow:0 3px 10px rgba(47,95,215,0.4);
}

/* Button modern */
button{
    margin-top:15px;
    padding:14px;
    font-size:16px;
    font-weight:600;
    border-radius:12px;
    border:none;
    background:linear-gradient(135deg,#2f5fd7,#4f8cff);
    color:#fff;
    cursor:pointer;
    transition:all 0.3s ease;
}

button:hover{
    transform:translateY(-2px);
    box-shadow:0 10px 25px rgba(47,95,215,0.3);
}

/* Download link modern */
#download{
    display:inline-block;
    margin-top:15px;
    padding:10px 18px;
    background:#eef3ff;
    color:#2f5fd7;
    border-radius:8px;
    text-decoration:none;
    font-weight:500;
}