:root {
  --bg: #0f172a;
  --surface: #111827;
  --card: #1f2937;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #22c55e;
  --ring: #10b981;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Inter,
    "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji",
    "Segoe UI Symbol", sans-serif;
  color: var(--text);
  background: radial-gradient(
      1200px 800px at 80% -10%,
      rgba(34, 197, 94, 0.15),
      transparent 40%
    ),
    radial-gradient(
      900px 700px at -10% 110%,
      rgba(16, 185, 129, 0.12),
      transparent 40%
    ),
    var(--bg);
  line-height: 1.6;
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100%;
}

.site-header,
.site-footer {
  padding: 1rem 1.25rem;
  background: linear-gradient(
    180deg,
    rgba(31, 41, 55, 0.75),
    rgba(17, 24, 39, 0.75)
  );
  border-bottom: 1px solid rgba(229, 231, 235, 0.06);
  backdrop-filter: blur(6px);
}

.site-footer {
  border-top: 1px solid rgba(229, 231, 235, 0.06);
  border-bottom: none;
}

h1 {
  margin: 0 0 0.25rem 0;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  letter-spacing: 0.2px;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.container {
  width: min(960px, 92vw);
  margin: 2rem auto;
  display: grid;
  gap: 1.25rem;
}

.card {
  background: linear-gradient(
    180deg,
    rgba(31, 41, 55, 0.9),
    rgba(17, 24, 39, 0.85)
  );
  border: 1px solid rgba(229, 231, 235, 0.06);
  border-radius: 16px;
  padding: 1.25rem 1.25rem 1rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

h2 {
  margin-top: 0;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
}

.result {
  background: rgba(31, 41, 55, 0.55);
  border: 1px solid rgba(229, 231, 235, 0.06);
  padding: 0.75rem 0.9rem;
  border-radius: 12px;
  margin: 0.5rem 0;
}

.result:focus-within,
.result:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--ring);
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.site-footer p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  text-align: center;
}