:root{
--header-height:90px;
}

*{
box-sizing:border-box;
margin:0;
padding:0;
}

body{
font-family:system-ui;
background:#f8fafc;
color:#0f172a;
padding-top:var(--header-height);
line-height:1.7;
}

/* HEADER */

#header{
height:var(--header-height);
background:#ffffff;
border-bottom:1px solid #e5e7eb;

display:flex;
align-items:center;
justify-content:space-between;

padding:0 24px;
position:fixed;
top:0;
width:100%;
z-index:9999;
}

.header-left{
display:flex;
align-items:center;
gap:10px;
}

#HIcon{
width:48px;
}

#HH1{
font-size:1.5rem;
font-weight:700;
}

.header-actions{
display:flex;
gap:10px;
}

#hamburger,
#darkModeToggle{
width:42px;
height:42px;
border-radius:10px;
border:1px solid #e5e7eb;
background:#f1f5f9;
font-size:1.4rem;
cursor:pointer;
}

/* NAV */

#nav{
position:fixed;
top:0;
right:-320px;
width:320px;
height:100vh;

background:#ffffff;
padding:90px 24px;
transition:right .3s ease;

z-index:10000;
box-shadow:-20px 0 40px rgba(0,0,0,.2);
}

#nav.active{
right:0;
}

#navClose{
position:absolute;
top:20px;
right:20px;
font-size:1.5rem;
background:none;
border:none;
cursor:pointer;
}

#nav ul{
list-style:none;
}

#nav li{
margin-bottom:18px;
}

#nav a{
text-decoration:none;
font-size:1.1rem;
color:#0f172a;
font-weight:600;
}

/* ARTICLE */

.article-container{
max-width:900px;
margin:60px auto;
padding:40px;

background:#dbe8f5;
border-radius:20px;
}

.article-title{
font-size:2.3rem;
margin-bottom:10px;
}

.article-meta{
font-size:.9rem;
color:#475569;
margin-bottom:30px;
}

.article-container h2{
margin-top:40px;
margin-bottom:15px;
}

.article-container p{
margin-bottom:18px;
}

.article-container ul{
margin:20px 0 20px 20px;
}

/* INFO BOX */

.info-box{
background:white;
padding:20px;
border-radius:12px;
margin-bottom:20px;
}

/* FOOTER */

#footer{
text-align:center;
padding:40px 20px;
margin-top:60px;
color:#475569;
}

/* DARK MODE */

body.dark-mode{
background:#0f172a;
color:#e5e7eb;
}

body.dark-mode #header,
body.dark-mode #nav{
background:#1e293b;
}

body.dark-mode .article-container{
background:#1e293b;
}

body.dark-mode .info-box{
background:#0f172a;
border:1px solid #334155;
}

/* REVEAL */

.reveal{
opacity:0;
transform:translateY(40px);
transition:.6s ease;
}

.reveal.active{
opacity:1;
transform:none;
}