:root {
  --bg: #0d1b2a;
  --card: #1b263b;
  --text: #e0e6ed;
  --muted: #9fb1c5;
  --accent: #f4a261;
  --accent-strong: #e76f51;
  --border: #2e3d57;
  --radius: 12px;
  font-family: "Source Sans Pro", system-ui, -apple-system, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 20% 20%, #1f4060, #0d1b2a 50%);
  color: var(--text);
  padding: 24px;
}

.card {
  width: min(500px, 100%);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.06));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
}

header h1 {
  margin: 0 0 6px;
  font-weight: 700;
  letter-spacing: 0.4px;
}

header p {
  margin: 0;
  color: var(--muted);
}

.output {
  margin: 18px 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

.output input {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  color: var(--text);
  font-size: 1.1rem;
  letter-spacing: 0.4px;
}

.output button {
  border: none;
  background: var(--accent);
  color: #1b263b;
  padding: 0 16px;
  border-radius: var(--radius);
  font-weight: 700;
  cursor: pointer;
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.output button:active {
  transform: translateY(1px);
  box-shadow: inset 0 2px 0 rgba(0, 0, 0, 0.25);
}

.controls {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  background: rgba(0, 0, 0, 0.2);
}

.range {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
  margin-bottom: 12px;
}

.range-input {
  display: flex;
  align-items: center;
  gap: 10px;
}

input[type="range"] {
  accent-color: var(--accent);
}

.options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 8px;
  color: var(--text);
}

.options label {
  display: flex;
  gap: 8px;
  align-items: center;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
}

.exclude {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 12px;
  color: var(--muted);
}

.exclude input {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text);
}

.actions {
  margin-top: 18px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.actions button {
  border: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #0d1b2a;
  padding: 12px 18px;
  border-radius: var(--radius);
  font-weight: 700;
  cursor: pointer;
  transition: filter 150ms ease;
}

.actions button:hover {
  filter: brightness(1.05);
}

#status {
  margin: 0;
  color: var(--muted);
  min-height: 1em;
}

@media (max-width: 540px) {
  .output {
    grid-template-columns: 1fr;
  }

  .actions {
    flex-direction: column;
    align-items: flex-start;
  }
}