body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #0e1117;
    color: #e5e7eb;
}

header {
    background: #111827;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

h1 {
    font-size: 18px;
    margin: 0;
    color: #93c5fd;
}

footer {
    text-align: center;
    padding: 10px;
    font-size: 13px;
    color: #6b7280;
}

select,
input {
    background: #020617;
    color: white;
    border: 1px solid #334155;
    padding: 6px;
    border-radius: 6px;
    width: 100%;
    box-sizing: border-box;
    margin-bottom: 6px;
}

main {
    padding: 20px;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.card {
    background: #111827;
    padding: 15px;
    border-radius: 10px;
    border: 1px solid #1e293b;
}

.card h2,
.card h3 {
    color: #60a5fa;
    margin-top: 0;
}

button {
    margin-top: 10px;
    background: #2563eb;
    border: none;
    padding: 8px;
    border-radius: 6px;
    color: white;
    cursor: pointer;
}

button:hover {
    opacity: 0.85;
}

.result {
    margin-top: 10px;
    color: #7dd3fc;
    font-size: 16px;
}

/* ===== ZONE IMAGE FLUX ===== */
.schema-box {
    margin-top: 12px;
    height: 300px;
    border: 1px dashed #2563eb;
    border-radius: 8px;
    background: #020617;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.schema-box img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

/* ===== SCHEMA SYSTEME ===== */
.schema-3d {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.layer {
    width: 260px;
    padding: 14px;
    text-align: center;
    border-radius: 8px;
    font-weight: bold;
    border: 2px solid #2563eb;
}

.layer-hot {
    background: #7f1d1d;
    color: #fecaca;
}

.layer-peltier {
    background: #1e3a8a;
    color: #bfdbfe;
}

.layer-cold {
    background: #064e3b;
    color: #bbf7d0;
}

.arrow {
    font-size: 28px;
    margin: 6px 0;
    color: #60a5fa;
}

/* ===== SCRAP ===== */
pre {
    background: #020617;
    padding: 10px;
    border-radius: 8px;
    overflow-x: auto;
}