:root {
  --bg: #0b1220;
  --itembg: #ffffff0f;
  --card: #0f172a;
  --border: rgba(255,255,255,0.1);
  --text: #e5e7eb;
  --muted: #a9bad3ff;
  --accent: #38bdf8;
  --danger: #fb7185;

  --radius: 12px;
  --spacing: 18px;
  --gap: 12px;
  --font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* --- Base Layout --- */

body {
  margin: 0;
  padding: 32px;
  background:
  radial-gradient(circle at top, 
    #19294d2d 0%, 
    #1c3dcf20 55%, 
    #191c5b10 100%
  ),
  var(--bg);

  color: var(--text);
  font-family: var(--font);
  display: flex;
  justify-content: center;
}

.wrapper {
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing);
}

/* --- Card --- */

.card {
  background:
        radial-gradient(circle at top left, rgba(56,189,248,0.3), transparent 75%),
        radial-gradient(circle at bottom right, rgba(59,130,246,0.25), transparent 75%),
        var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--spacing);
}

/* --- Title & Badge --- */

.title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.title {
  display: flex;
  align-items: center;
  gap: 6px;
}

h1, h2 {
  margin: 0;
  font-size: 1.2rem;
}

.badge {
  font-size: .7rem;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
  text-transform: uppercase;
}

/* --- Subtitles, Labels, Inputs --- */

.subtitle {
  margin: 10px 0;
  color: var(--muted);
  font-size: .9rem;
}

.row {
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  margin-bottom: var(--gap);
}

label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: .75rem;
  text-transform: uppercase;
  color: var(--muted);
}

input, select {
  padding: 8px 16px;
  background: var(--itembg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: .9rem;
}

select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  padding-right: 26px;
  cursor: pointer;
  color: var(--muted);
  background-image:
    linear-gradient(45deg, transparent 50%, var(--muted) 50%),
    linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position:
    calc(100% - 15px) 50%,
    calc(100% - 10px) 50%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}

input[type="number"] {
  appearance: textfield;
  -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}


/* --- Results --- */

.results {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  margin-bottom: var(--spacing);
}

.result-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
  font-size: .8rem;
  font-weight: bold;
  letter-spacing: .05em;
}

.result-card[data-result="Average"],
.result-card[data-result="Emissions"]{
  border-color: var(--accent);
  color: var(--accent);
  text-transform: uppercase;
}

/* --- Validation Warning --- */

[data-validation] {
  font-size: .85rem;
  color: var(--danger);
  margin-top: -6px;
}

/* --- Spacer --- */

.schema-spacer {
  height: var(--gap);
}

/* --- Buttons & Footer --- */

footer {
  margin-top: var(--spacing);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

button {
  all: unset;
  padding: 8px 16px;
  margin: 8px, 12px;
  border-radius: var(--radius);
  font-size: .85rem;
  border: 1pt solid var(--muted);
  color: var(--muted);
}

button:hover {
  background: var(--itembg);
}

footer p {
  width: 100%;
  margin-top: 10px;
  font-size: .85rem;
  color: var(--muted);
  line-height: 1.5;
}

a {
  color: var(--muted);
  text-decoration: underline;
}

/* --- Rendering ---*/
.render-card {
  padding: 0;
}

.viewer-container {
  width: 100%;
  height: 200px;
  border-radius: 12px;
  overflow: hidden;
}
canvas#radiator-viewer {
  width: 100%;
  height: 100%;
  display: block;
}

/* --- Responsive --- */

@media (max-width: 480px) {
  body { padding: 12px; }
  .wrapper { gap: 14px; }
}