:root {
  --bg: #0f172a;
  --card: #111827;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --accent: #22d3ee;
  --accent-2: #14b8a6;
  --danger: #f97316;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 20%, rgba(34, 211, 238, 0.15), transparent 35%),
    radial-gradient(circle at 80% 0%, rgba(20, 184, 166, 0.12), transparent 30%),
    var(--bg);
}

.app {
  width: min(820px, 92vw);
  margin: 40px auto;
  display: grid;
  gap: 16px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
}

.hero p {
  margin: 8px 0 0;
  color: var(--muted);
}

.card {
  background: linear-gradient(165deg, rgba(17, 24, 39, 0.95), rgba(15, 23, 42, 0.92));
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 14px;
  padding: 16px;
  display: grid;
  gap: 10px;
}

.label {
  font-size: 0.9rem;
  color: var(--muted);
}

input,
button {
  width: 100%;
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: rgba(2, 6, 23, 0.6);
  color: var(--text);
  padding: 10px 12px;
  font: inherit;
}

button {
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #042f2e;
  font-weight: 700;
}

button:disabled {
  opacity: 0.6;
  cursor: wait;
}

.results {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.results li {
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 10px;
  padding: 10px;
  display: grid;
  gap: 10px;
}

.modes {
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 10px;
  padding: 10px 12px;
  display: grid;
  gap: 6px;
}

.modes legend {
  padding: 0 6px;
}

.modes label {
  display: flex;
  align-items: baseline;
  gap: 8px;
  cursor: pointer;
}

.modes input {
  width: auto;
  margin: 0;
}

.preview {
  width: 100%;
  height: 480px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 8px;
  background: #0b1220;
}

.result-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.variant-list {
  display: grid;
  gap: 8px;
}

.variant-row {
  display: grid;
  grid-template-columns: minmax(120px, 1fr) minmax(140px, 1fr) auto;
  align-items: center;
  gap: 10px;
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 8px;
  padding: 8px;
}

.mode,
.size {
  color: var(--muted);
  font-size: 0.9rem;
}

.download {
  justify-self: end;
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 700;
  color: #042f2e;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-radius: 8px;
  padding: 8px 12px;
}

small {
  color: var(--muted);
}

.error {
  color: var(--danger);
}

@media (max-width: 620px) {
  .variant-row {
    grid-template-columns: 1fr;
  }

  .download {
    justify-self: start;
  }
}