:root {
  --bg: #0f1419;
  --card: #1a222c;
  --text: #eef2f6;
  --muted: #9aa7b5;
  --accent: #3d9cfd;
  --accent-2: #1f6feb;
  --ok: #3fb950;
  --bad: #f85149;
  --border: #2b3642;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: radial-gradient(1200px 600px at 10% -10%, #1b3a5a 0%, transparent 50%),
              radial-gradient(900px 500px at 100% 0%, #243018 0%, transparent 45%),
              var(--bg);
  color: var(--text);
  min-height: 100vh;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 20px 14px 48px; }
.hero {
  padding: 18px 4px 8px;
}
.hero h1 { margin: 0; font-size: 1.6rem; letter-spacing: -0.02em; }
.hero p { margin: 8px 0 0; color: var(--muted); }
.card {
  background: color-mix(in srgb, var(--card) 92%, black);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  margin: 12px 0;
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
}
h2 { margin: 0 0 10px; font-size: 1.05rem; }
label { display: block; margin: 10px 0 6px; color: var(--muted); font-size: .9rem; }
input, select, textarea, button {
  font: inherit;
}
input, select, textarea {
  width: 100%;
  background: #0d1218;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
}
.row { display: flex; gap: 8px; align-items: center; }
.row.gap { margin-top: 10px; flex-wrap: wrap; }
.row input { flex: 1; }
button {
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  color: white;
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 700;
  cursor: pointer;
}
button.secondary {
  background: #243040;
  border: 1px solid var(--border);
}
button:disabled { opacity: .5; cursor: not-allowed; }
.muted { color: var(--muted); font-size: .92rem; margin: 8px 0 0; }
#reader {
  overflow: hidden;
  border-radius: 12px;
  background: #000;
  min-height: 40px;
}
#result {
  white-space: pre-wrap;
  word-break: break-word;
  background: #0d1218;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  margin: 0;
  min-height: 4.5rem;
  font-size: .85rem;
}
.ok { color: var(--ok); }
.bad { color: var(--bad); }