body {
    font-family: 'Segoe UI', sans-serif;
    background: #f1f5f9;
    margin: 0;
}

/* CONTAINER */
.container {
    width: 420px;
    margin: 120px auto;
    background: white;
    padding: 35px;
    border-radius: 14px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    text-align: center;
}

/* TITLE */
h2 {
    color: #1e3a8a;
    margin-bottom: 25px;
}

/* FILE INPUT */
input[type="file"] {
    margin: 20px 0;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid #d1d5db;
    width: 100%;
}

/* BUTTON */
button {
    background: linear-gradient(135deg, #2563eb, #1e40af);
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(37, 99, 235, 0.3);
}

/* ERROR */
#error {
    color: red;
    margin-top: 15px;
}

/* FILE INPUT WRAPPER */
.file-input {
    position: relative;
    display: inline-block;
    width: 100%;
}
/* FILE INPUT SECTION */
.file-input {
    margin: 20px 0;
}

/* FILE NAME TEXT */
#fileName {
    margin-top: 10px;
    font-size: 14px;
    color: #555;
}

/* CUSTOM BUTTON */
.file-label {
    display: block;
    padding: 12px;
    border: 2px dashed #2563eb;
    border-radius: 10px;
    text-align: center;
    color: #2563eb;
    font-weight: 500;
    cursor: pointer;
    transition: 0.3s;
}

.file-label:hover {
    background: #eff6ff;
}