:root {
    --color-background: #f5f7fa;
    --color-foreground: #2e3a59;
    --color-accent: #4b86b4;
    --color-highlight: #a3c4dc;
    --color-border: #d0d8e4;
    --font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

html, body {
    margin: 0;
    padding: 0;
    /*min-height: 100vh;*/
    height: 100%;
    font-family: var(--font-family);
    color: var(--color-foreground);
    background-color: var(--color-background);
    /* leave room for the fixed advertisement bar */
    padding-bottom: 100px;
    box-sizing: border-box;
}

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

a:hover {
    text-decoration: underline;
}

header {
    text-align: center;
    padding: 1rem;
    background-color: var(--color-foreground);
    color: #ffffff;
    position: sticky;
    top: 0;
    z-index: 1;
}

header h1 {
    margin: 0;
    font-size: 1.8rem;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

/* Configuration controls */
.configurations {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.config-group {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    background-color: #ffffff;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
}
.config-label {
    font-weight: 600;
    margin-right: 0.5rem;
}

.config-group label {
    margin-right: 0.5rem;
    white-space: nowrap;
}

/* Calculator layout */
.calculator {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: flex-start;
}

.diagram-container {
    flex: 1 1 300px;
    text-align: center;
}
.diagram-container img {
    max-width: 100%;
    height: auto;
    border: 1px solid var(--color-border);
    border-radius: 4px;
}

.inputs-and-results {
    flex: 1 1 300px;
}

/* Sliders */
.sliders {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1rem;
}
.slider-group label {
    font-weight: 600;
    display: block;
    margin-bottom: 0.25rem;
}
.range-input {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.range-input input[type="range"] {
    flex: 1;
}
.range-input input[type="number"] {
    width: 80px;
    padding: 0.25rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background-color: #ffffff;
}
.unit-label {
    min-width: 2rem;
}

/* Custom styles for range sliders */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--color-highlight);
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
}

/* Results table */
.results {
    width: 100%;
    border-collapse: collapse;
    background-color: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    overflow: hidden;
}
.results th,
.results td {
    padding: 0.75rem;
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}
.results th {
    background-color: var(--color-accent);
    color: #ffffff;
    font-weight: 600;
}
.results tr:last-child td {
    border-bottom: none;
}

/* Text content sections (FAQ, Privacy Policy) */
.faq,
.policy {
    margin-top: 2rem;
    background-color: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 1rem;
    line-height: 1.6;
}

.faq h2,
.policy h1,
.policy h2,
.policy h3 {
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    color: var(--color-accent);
}

.faq p,
.policy p {
    margin-top: 0;
    margin-bottom: 1rem;
}

.results-container {
    flex: 1 1 300px;
    text-align: left;
}
.results-container img {
    max-width: 100%;
    height: auto;
    border: 1px solid var(--color-border);
    border-radius: 4px;
}

/* Adjust calculator layout on small screens: stack diagram above inputs */
@media (max-width: 800px) {
    .calculator {
        flex-direction: column;
    }
    .diagram-container,
    .inputs-and-results {
        flex: 1 1 100%;
    }
}

footer {
    text-align: center;
    padding: 1rem;
    background-color: var(--color-foreground);
    color: #ffffff;
    margin-top: 2rem;
}

footer a {
    color: var(--color-highlight);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}