```css
/* ==========================
GLOBAL
========================== */

body{
margin:0;
font-family:Arial,sans-serif;
background:#f3f5f8;
color:#1f2937;
}

*{
box-sizing:border-box;
}



/* ==========================
LAYOUT
========================== */

.wrapper{
display:flex;
min-height:100vh;
}

.sidebar{

width:280px;

height:100vh;

position:sticky;

top:0;

overflow-y:auto;

padding:30px;

background:#1e3a8a;

color:white;

display:flex;

flex-direction:column;

}

.main{

flex:1;

padding:50px;

}

.container{

max-width:1300px;

background:white;

padding:40px;

border-radius:15px;

box-shadow:0 4px 20px rgba(0,0,0,.1);

}



/* ==========================
SIDEBAR
========================== */

.sidebar h2{

margin-top:0;

margin-bottom:25px;

font-size:22px;

}

.menu-item{

display:block;

width:100%;

padding:14px;

margin-bottom:12px;

background:#2747b3;

border-radius:8px;

text-decoration:none;

color:white;

font-size:16px;

line-height:1.4;

transition:.2s;

}

.menu-item:hover{

background:#3659d1;

transform:translateX(3px);

}



/* ==========================
HEADINGS
========================== */

h1{

color:#1e3a8a;

}



/* ==========================
INPUT
========================== */

input{

width:100%;

padding:15px;

font-size:18px;

border:1px solid #cbd5e1;

border-radius:8px;

margin-bottom:20px;

outline:none;

transition:.2s;

}

input:focus{

border:1px solid #2563eb;

box-shadow:0 0 0 3px rgba(37,99,235,.15);

}



/* ==========================
BUTTONS
========================== */

.button-group{

margin-bottom:20px;

}

button{

background:#2563eb;

color:white;

border:none;

padding:14px 25px;

font-size:16px;

border-radius:8px;

cursor:pointer;

margin-right:10px;

margin-bottom:10px;

transition:.2s;

}

button:hover{

background:#1d4ed8;

}

button:disabled{

background:#94a3b8;

cursor:not-allowed;

opacity:.8;

}



/* ==========================
LOADER
========================== */

#loader{

display:none;

margin-top:20px;

font-size:18px;

font-weight:700;

color:#1e3a8a;

}



/* ==========================
TIMER
========================== */

#timer{

display:inline-block;

margin-top:15px;

padding:10px 14px;

background:#dbeafe;

border-radius:8px;

font-weight:700;

color:#1e3a8a;

}



/* ==========================
TIMESTAMP
========================== */

#timestamp{

display:block;

margin-top:15px;

margin-bottom:20px;

font-size:15px;

font-weight:600;

color:#475569;

}



/* ==========================
OUTPUT SECTION
========================== */

#output{

margin-top:30px;

line-height:1.8;

overflow-x:auto;

}



/* ==========================
OUTPUT HEADINGS
========================== */

#output h1{

font-size:34px;

color:#1e3a8a;

margin-top:30px;

margin-bottom:20px;

}

#output h2{

font-size:28px;

color:#1e3a8a;

margin-top:35px;

padding-bottom:10px;

border-bottom:2px solid #e5e7eb;

}

#output h3{

font-size:22px;

color:#374151;

margin-top:25px;

}



/* ==========================
OUTPUT TEXT
========================== */

#output p{

font-size:16px;

line-height:1.9;

color:#374151;

}

#output ul,

#output ol{

padding-left:28px;

line-height:1.9;

}

#output li{

margin-bottom:8px;

}



/* ==========================
HORIZONTAL RULE
========================== */

hr,

#output hr{

border:none;

border-top:1px solid #e5e7eb;

margin:30px 0;

}



/* ==========================
TABLES
========================== */

#output table{

width:100%;

border-collapse:collapse;

margin:25px 0;

background:white;

font-size:15px;

table-layout:auto;

}

#output th,

#output td{

border:1px solid #d1d5db;

padding:12px;

text-align:left;

vertical-align:top;

line-height:1.7;

word-break:break-word;

}

#output th{

background:#eef2ff;

color:#1e3a8a;

font-weight:700;

}

#output tr:nth-child(even){

background:#f8fafc;

}

#output tr:hover{

background:#f1f5f9;

}



/* ==========================
FOOTER
========================== */

.footer{

margin-top:50px;

text-align:center;

color:#666;

font-size:14px;

}



/* ==========================
RESPONSIVE
========================== */

@media(max-width:1000px){

.wrapper{

flex-direction:column;

}

.sidebar{

width:100%;

height:auto;

position:relative;

}

.main{

padding:20px;

}

.container{

padding:25px;

}

button{

width:100%;

margin-right:0;

}

#output table{

font-size:14px;

}

}
```