/* ===========================
   ОБЩИЕ СТИЛИ
=========================== */
body {
    font-family: 'Fira Mono', monospace;
    margin: 0;
    padding: 0;
    background-color: #0d1117; /* тёмный фон */
    color: #c9d1d9; /* светлый текст */
    line-height: 1.6;
}

/* ===========================
   HEADER
=========================== */
header {
    background-color: #161b22;
    color: #58a6ff; /* синий “научный” акцент */
    padding: 15px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #30363d;
}

header h1 {
    font-size: 1.8em;
    margin: 0;
    font-weight: 600;
}

header nav a {
    color: #58a6ff;
    margin-left: 20px;
    text-decoration: none;
    font-weight: 500;
}

header nav a:hover {
    text-decoration: underline;
}

/* ===========================
   HAMBURGER MENU
=========================== */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger div {
    width: 25px;
    height: 3px;
    background-color: #58a6ff;
}

@media (max-width:768px){
    nav {
        display: none;
        flex-direction: column;
        background-color: #161b22;
        position: absolute;
        top: 60px;
        right: 0;
        width: 200px;
        border-left: 1px solid #30363d;
        border-bottom: 1px solid #30363d;
    }
    nav.show {
        display: flex;
    }
    .hamburger {
        display: flex;
    }
}

/* ===========================
   MAIN SECTIONS
=========================== */
.section {
    padding: 20px;
    margin: 20px auto;
    max-width: 900px;
    background-color: #0d1117;
    border: 1px solid #30363d;
    border-radius: 6px;
}

.section h2 {
    color: #58a6ff;
    margin-top: 0;
    font-weight: 600;
}

/* ===========================
   INPUTS
=========================== */
.input-row {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 15px;
}

.input-row label {
    display: flex;
    flex-direction: column;
    font-weight: 500;
    flex: 1 1 120px;
}

input {
    padding: 6px 10px;
    border: 1px solid #30363d;
    border-radius: 4px;
    background-color: #0d1117;
    color: #c9d1d9;
}

input:focus {
    outline: none;
    border-color: #58a6ff;
}

/* ===========================
   BUTTONS
=========================== */
button {
    padding: 8px 16px;
    background-color: #161b22;
    color: #58a6ff;
    border: 1px solid #58a6ff;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: 0.2s;
}

button:hover {
    background-color: #58a6ff;
    color: #0d1117;
}

/* ===========================
   FOOTER
=========================== */
footer {
    text-align: center;
    padding: 12px;
    border-top: 1px solid #30363d;
    color: #8b949e;
    font-size: 0.85em;
}

/* ===========================
   CANVAS / GRAPH
=========================== */
canvas {
    width: 100%;
    height: auto;
    border: 1px solid #30363d;
    border-radius: 4px;
    background-color: #0d1117;
}

/* ===========================
   RESPONSIVE
=========================== */
@media (max-width:500px){
    .input-row { flex-direction: column; }
}