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

body{
background:#020817;
color:white;
font-family:Arial,sans-serif;
line-height:1.5;
max-width: 1300px;
margin: auto;
}

header{
text-align:center;
padding:40px 20px;
}

header h1{
font-size:3rem;
}

header h2{
font-size:1.5rem;
margin-top:10px;
color:#6fd3ff;
}

nav{
margin-top:25px;
}

nav a{
color:#6fd3ff;
text-decoration:none;
margin:0 15px;
font-size:1.1rem;
}

main{
width:95%;
max-width:1800px;
margin:auto;
}

/* TOP AREA */

.top-section{
display:grid;
grid-template-columns:320px 1fr;
gap:20px;
margin-bottom:20px;
}

.existence,
.manifestation,
.regime,
.identification,
.schema,
.principles{
background:#081326;
border:1px solid #1d3657;
border-radius:12px;
padding:25px;
}
.ontology-flow{
/* Image source */
    background-image: url('../images/regime-core.png');
    background-color: #000414;
    /* Resize / extend behavior */
    /*background-size: cover;         or: contain, auto, 100% 100%, etc. */
    background-size: 55% auto;
    background-position-x: 30%;
    background-position-y: 70%;
    background-repeat: no-repeat;
    background-attachment: scroll; /* or: fixed, local */
    border:1px solid #1d3657;
border-radius:12px;

}
.existence,.manifestation, .regime, .identification{
    background:none;
}
.manifestation, .regime, .identification{
border: 0;
}

.existence img{
width:100%;
display:block;
margin:20px auto;
}

.ontology-flow{
display:grid;
grid-template-columns:1fr 1fr 1fr;
gap:20px;
}

/* SCHEMA + PRINCIPLES */

.bottom-section{
display:grid;
grid-template-columns:1fr 1.5fr;
gap:20px;
margin-bottom:20px;
}


.formula{
    display:flex;
    justify-content:center;
    align-items:center;
    gap:15px;
    flex-wrap:wrap;
    margin:30px 0;
}

.formula-item{
    font-size:1.8rem;
    font-family:serif;
}

.formula-arrow{
    position:relative;
    font-size:2.5rem;
    color:#ffd34d;
}

.formula-label{
    position:absolute;
    top:-22px;
    left:50%;
    transform:translateX(-50%);
    font-size:1rem;
    color:#ffd34d;
}


.legend p{
margin-bottom:10px;
}

.cards{
display:grid;
grid-template-columns:repeat(4,1fr);
gap:15px;
margin-top:20px;
}

.card{
border:1px solid #29476f;
border-radius:10px;
padding:20px;
text-align:center;
min-height:120px;
display:flex;
align-items:center;
justify-content:center;
}












.expression-item,
.identification-item{
    display:flex;
    align-items:flex-start;
    gap:14px;
    margin:18px auto;
}

.expression-item img,
.identification-item img{
    width:48px;
    height:48px;
    flex-shrink:0;
}

.expression-text,
.identification-text{
    flex:1;
}

.expression-text h4,
.identification-text h4{
    margin:0 0 4px 0;
    font-size:1rem;
}
.expression-text h4{
max-width: 100px;
}
.expression-text p,
.identification-text p{
    margin:0;
    opacity:.85;
}












/* ENDING */

.closing{
text-align:center;
padding:35px;
font-size:1.15rem;
margin-bottom:20px;
}

footer{
text-align:center;
padding:25px;
border-top:1px solid #1d3657;
}

/* TABLET */

@media(max-width:1000px){

.top-section{
grid-template-columns:1fr;
}

.ontology-flow{
grid-template-columns:1fr;
}

.bottom-section{
grid-template-columns:1fr;
}

.cards{
grid-template-columns:repeat(2,1fr);
}

.ontology-flow{
/* Image source */
    background-image: url('../images/regime-core.png');
    background-color: #000414;
    /* Resize / extend behavior */
    /*background-size: cover;         or: contain, auto, 100% 100%, etc. */
    background-size: 150% auto;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: scroll; /* or: fixed, local */


}

}

/* MOBILE */

@media(max-width:492px){

header h1{
font-size:2rem;
}

header h2{
font-size:1.1rem;
}

.cards{
grid-template-columns:1fr;
}

.formula{
font-size:1.3rem;
}

nav a{
display:block;
margin:10px 0;
}


}