:root {
  --bg: #0f1419;
  --panel: #1a222c;
  --text: #e7ecf1;
  --muted: #8b9aab;
  --accent: #3d8bfd;
  --danger: #e35d6a;
  --border: #2a3542;
  --font: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: radial-gradient(1200px 600px at 10% -10%, #1c2a3a, var(--bg));
  color: var(--text);
}
#app { max-width: 960px; margin: 0 auto; padding: 2rem 1.25rem 4rem; }
.panel { background: color-mix(in srgb, var(--panel) 92%, black); border: 1px solid var(--border); border-radius: 12px; padding: 1.5rem; }
h1, h2 { margin: 0 0 0.75rem; font-weight: 600; letter-spacing: -0.02em; }
.muted { color: var(--muted); font-size: 0.9rem; }
label { display: flex; flex-direction: column; gap: 0.35rem; margin: 0.75rem 0; font-size: 0.85rem; color: var(--muted); }
input, select {
  background: #0c1117; border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; padding: 0.65rem 0.75rem; font: inherit;
}
button {
  margin-top: 0.75rem; background: var(--accent); color: white; border: 0;
  border-radius: 8px; padding: 0.65rem 1rem; font: inherit; cursor: pointer;
}
button.ghost { background: transparent; border: 1px solid var(--border); color: var(--text); }
button:hover { filter: brightness(1.08); }
.error { color: var(--danger); }
.row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.gap { gap: 0.75rem; }
.card { margin-top: 1.25rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0.75rem; }
table { width: 100%; border-collapse: collapse; margin-top: 0.75rem; font-size: 0.92rem; }
th, td { text-align: left; padding: 0.55rem 0.4rem; border-bottom: 1px solid var(--border); }
.result { background: #0c1117; padding: 0.75rem; border-radius: 8px; overflow: auto; font-size: 0.85rem; }
select.iso { min-width: 6rem; }