:root{
    --bg:#000000;
    --header-bg:#191831d4;     /* тёмно-серый header */
    --text:#f2f2f2;
    --accent:#ff7b00;
    --execute-bg:#ffb300f5;
    --muted:#999;
    --line:#1a1a1a;
    --input-bg:#7b7c835d; 
}

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

body{
    background:var(--bg);
    color:var(--text);
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
    display:flex;
    flex-direction:column;
    min-height:100vh;
    min-width: 840px;
}

/*.   remove Spinner in Input fields */
input[type=number]::-webkit-inner-spin-button, 
input[type=number]::-webkit-outer-spin-button { 
    -webkit-appearance: none;
    margin: 0;
}

input[type=number] {
    -moz-appearance: textfield; /* Firefox */
    appearance: textfield;      /* Современные браузеры */
}

/* HEADER */
header{ 
    background:var(--header-bg);
    padding:0px 20px;
}

.header-container{
    display:flex;
    align-items:center;
    justify-content:space-between;
}

.logo{
    height:42px;
    width:auto;
}

nav{
    display:flex;
    gap:30px;
}

nav a{
    color:var(--text);
    text-decoration:none;
    font-size:0.95rem;
    transition:0.1s;
}

nav a:hover{
    color:var(--accent);
}

.menu-item {
    padding: 15px 10px;
    color: white;
    text-decoration: none;
    display: block;
    height:52px;
}

header hr{
    margin-top:15px;
    border:0;
    height:1px;
    background:#1a1a1a;
}

/* Стили выпадающего меню */
.dropdown {
    position: relative;
    height:52px;
}

  /* Показываем подменю при наведении */
.dropdown:hover .submenu {
    display: block;
}

.submenu {
    display: none;
    position: absolute;
    background-color:#383a45;
    z-index: 10000;
    opacity: 1;
    padding: 10px 10px ;
    min-width: 220px;
    border-radius: 4px;
  }

.submenu a {
    padding: 10px 10px ;

}
  .submenu a {
    display: block; /* Ссылки в подменю вертикально */
  }

 .exchange_list{
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    width: 150px;

 }



/* MAIN */
main{
    flex:1;
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;
    padding:40px 20px;
}

.content-placeholder{
    background:var(--header-bg);
    max-width:900px;
    width:100%;
    border:1px dashed #ff7b00;
    padding:60px 20px;
    border-radius:12px;
}

.input-container{
    display: flex;
    align-items: center;
    margin-top:30px;
    flex-direction:column;
    gap:20px;
    text-align: left;
    color:var(--text);
    font-size:0.95rem;
}

.output_field{
    display: flex;
    align-items: center;
    margin-top:30px;
    flex-direction:column;
    gap:20px;
    text-align: left;
    color:var(--text);
    font-size:0.95rem;
}


.PInput{
    width:300px;
    height:52px;
    background:var(--input-bg);
    border:none;
    border-radius:8px;
    padding:0 15px;
    font-size:18px;
    color:rgb(255, 255, 255);
    text-align: left;
    color:var(--text);
    font-size:0.95rem;
}

.PInput_range{
    width:145px;
    height:52px;
    background:var(--input-bg);
    border:none;
    border-radius:8px;
    padding:0 15px;
    font-size:18px;
    color:rgb(255, 255, 255);
    text-align: left;
    color:var(--text);
    font-size:0.95rem;
}

.PInput_coin{
    width:200px;
    height:52px;
    background:var(--input-bg);
    border:none;
    border-radius:8px;
    padding:0 15px;
    font-size:18px;
    color:rgb(255, 255, 255);
    text-align: left;
    color:var(--text);
    font-size:0.95rem;
}

.Poutput{
    width:145px;
    height:52px;
    background:var(--input-bg);
    border: 1px solid #c4bcb5b7;
    border-radius:8px;
    /* padding:0 15px; */
    padding:15px 15px; 
    text-align: center;
    font-size:18px;
    color:rgb(255, 255, 255);
    text-align: left;
    color:var(--text);
    font-size:0.95rem;
}

.Price_output{
    width:200px;
    height:52px;
    background:var(--input-bg);
    border: 1px solid #c4bcb5b7;
    border-radius:8px;
    /* padding:0 15px; */
    padding:15px 15px; 
    text-align: center;
    font-size:18px;
    color:rgb(255, 255, 255);
    text-align: left;
    color:var(--text);
    font-size:0.95rem;
}

.Poutput label {
    width: 50px;
    font-weight: bold;
    color: #555;
    font-size: 18px;
}

.send-button{
    background:var(--input-bg);
    border: 1px;;
    padding:15px 40px;
    font-size:18px;
    color:rgb(255, 255, 255);
    border-radius:8px;
    cursor:pointer;
    transition:0.3s;
}

.execute-button{
    width:440px;
    background:var(--execute-bg);
    border: 1px solid #e46b02b7;
    padding:15px 40px;
    font-size:18px;
    color:rgb(0, 0, 0);
    border-radius:8px;
    cursor:pointer;
    transition:0.3s;
}

.send-button:hover{
    opacity:0.6;
}

.execute-button:hover{
    opacity:0.6;    
}

.result_window{
    max-width: 100%;
    /* width:380px; */
    height:240px;
    background:var(--input-bg);
    border-radius:0px;
    color:#fff;
    border: 1px solid #e47f27b7;
    font-size:16px;
    text-align: left;
    display:flex
}

.plot_window{
    /*max-width: 100%;*/
     width:640px; 
    min-height: 200px;
    background:var(--input-bg);
    border-radius:0px;
    color:#fff;
    border: 1px solid #e47f27b7;
    font-size:16px;
    text-align: left;
}

.legend_window{
    max-width: 100%;
    width:220px; 
    padding:15px 15px;
    /*height:380px; */
    height: auto;
    background:var(--input-bg);
    border-radius:0px;
    color:#fff;
    border: 1px solid #e47f27b7; 
    font-size:16px;
    text-align: left;
}



.plotImage{
    max-width: 100%;
    width:600px; 
    /*height:380px; */
    height: auto;
    background:var(--input-bg);
    border-radius:0px;
    color:#fff;
    border: 1px solid #e47f27b7;
    font-size:16px;
    text-align: left;
}

/* FOOTER */
footer{
    padding:30px 20px;
    text-align:center;
    
}

footer a{
    color:var(--text);
    text-decoration:none;
    margin:10px 15px;
    font-size:0.9rem;
    transition:0.3s;
}

footer a:hover{
    color:var(--accent);
}

/* CALC. */
 .input-group {
            margin-bottom: 20px;
        }
        .input-row {
           /* display: flex; */
            align-items: center;
            gap: 15px;
            margin-bottom: 15px;
        }
        .input-row label {
            width: 50px;
            font-weight: bold;
            color: #555;
            font-size: 18px;
        }
        .input-row input {
            flex: 1;
            padding: 12px;
            border: 1px solid #c4bcb5b7;
            border-radius: 6px;
            font-size: 16px;
            transition: border-color 0.3s;
        }

        .input-row select {
            flex: 1;
            padding: 12px;
            border: 1px solid #c4bcb5b7;
            border-radius: 6px;
            font-size: 16px;
            transition: border-color 0.3s;
        }

        .input-row select:focus {
            border-color: #e36f17;
            outline: none;
        }

        .input-row input:focus {
            border-color: #e36f17;
            outline: none;
        }

.field_name{
    font-size:14px;
    color:#cccccc7f;
    padding: 6px;
    text-align: center;

}
    .plot_image {
        width: 600px;
        height: 450px;
        text-align: center;
        align-items: center;
        object-fit: cover; /* сохраняет пропорции, обрезая лишнее */
        border-radius: 5px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    }

/* MOBILE */
@media(max-width:768px){
    .header-container{
        flex-direction:column;
        gap:15px;
    }

    nav{
        flex-wrap:wrap;
        justify-content:center;
        gap:20px;
    }
}