:root {
  color-scheme: light dark;
  --bg: #0b1220;
  --panel: rgba(255, 255, 255, 0.06);
  --panel2: rgba(255, 255, 255, 0.09);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.7);
  --border: rgba(255, 255, 255, 0.14);
  --primary: #6ea8fe;
  --danger: #ff6b6b;
  --ok: #2dd4bf;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f7fb;
    --panel: rgba(0, 0, 0, 0.04);
    --panel2: rgba(0, 0, 0, 0.06);
    --text: rgba(0, 0, 0, 0.9);
    --muted: rgba(0, 0, 0, 0.65);
    --border: rgba(0, 0, 0, 0.12);
    --shadow: 0 18px 60px rgba(10, 20, 40, 0.16);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial,
    "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 800px at 20% 10%, rgba(110, 168, 254, 0.25), transparent),
    radial-gradient(1000px 600px at 80% 20%, rgba(45, 212, 191, 0.22), transparent),
    var(--bg);
  color: var(--text);
}

.app {
  max-width: 860px;
  margin: 48px auto;
  padding: 0 18px 40px;
}

.header {
  margin-bottom: 18px;
}

.title {
  margin: 0;
  font-size: 34px;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.4;
}

.card {
  background: linear-gradient(180deg, var(--panel2), var(--panel));
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  margin-top: 14px;
}

.row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.row-spaced {
  margin-top: 12px;
  gap: 14px;
}

.field {
  display: grid;
  gap: 6px;
  min-width: 220px;
}

.field-label {
  font-size: 12px;
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.select {
  appearance: none;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border-radius: 12px;
  padding: 10px 12px;
  font-weight: 600;
}

.meter {
  position: relative;
  height: 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  overflow: hidden;
  margin-top: 12px;
}

.meter-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, rgba(45, 212, 191, 0.9), rgba(110, 168, 254, 0.9));
  transition: width 80ms linear;
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: 12px;
  padding: 10px 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn:hover {
  background: rgba(255, 255, 255, 0.06);
}

.btn-primary {
  border-color: rgba(110, 168, 254, 0.45);
  background: rgba(110, 168, 254, 0.14);
}

.btn-primary:hover {
  background: rgba(110, 168, 254, 0.18);
}

.btn-danger {
  border-color: rgba(255, 107, 107, 0.5);
  background: rgba(255, 107, 107, 0.14);
}

.status {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 12px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  font-weight: 700;
  font-size: 12px;
}

.hint {
  color: var(--muted);
  font-size: 13px;
}

.h2 {
  margin: 0 0 10px;
  font-size: 14px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--muted);
}

.output {
  min-height: 52px;
  padding: 12px 12px;
  border-radius: 12px;
  border: 1px dashed var(--border);
  background: rgba(0, 0, 0, 0.08);
  font-size: 18px;
  line-height: 1.4;
  white-space: pre-wrap;
  word-break: break-word;
}

.output-muted {
  opacity: 0.8;
  font-style: italic;
}

.small {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.footer {
  margin-top: 14px;
}