:root {
  --bg: #0c1110; --card: #141b19; --line: #24302c; --fg: #e8efe9; --muted: #8a9b93;
  --accent: #3ddc97; --accent-fg: #06150e; --err: #ff6b6b; --r: 14px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: radial-gradient(900px 500px at 80% -10%, #12352a 0%, transparent 60%), var(--bg);
  color: var(--fg); font: 16px/1.55 var(--font); min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: 640px; margin: 0 auto; padding: 32px 20px 48px; }
.brand { font-weight: 600; font-size: 18px; letter-spacing: .02em; margin-bottom: 36px; }
.brand b { color: var(--accent); font-weight: 700; }
.logo { color: var(--accent); margin-right: 4px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r);
  padding: 28px; box-shadow: 0 20px 60px -30px #000;
}
h1, h2 { margin: 0 0 8px; line-height: 1.2; letter-spacing: -.02em; }
h1 { font-size: clamp(26px, 6vw, 34px); }
h2 { font-size: 24px; }
.lead { color: var(--muted); margin: 0 0 22px; }
label { display: block; font-size: 13px; color: var(--muted); margin: 0 0 6px; }
textarea, input, select {
  width: 100%; background: var(--bg); color: var(--fg); border: 1px solid var(--line);
  border-radius: 10px; padding: 12px 14px; font: 15px/1.5 var(--mono); outline: none;
}
textarea { resize: vertical; }
select { font-family: var(--font); width: auto; }
textarea:focus, input:focus, select:focus { border-color: var(--accent); }
.row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 14px 0 20px; }
.row label { margin: 0; }
.row .ghost { margin-left: auto; }
button {
  font: 600 15px var(--font); border-radius: 10px; padding: 12px 18px; cursor: pointer;
  border: 1px solid transparent; transition: transform .1s, opacity .2s;
}
button:active { transform: scale(.98); }
button:disabled { opacity: .6; cursor: wait; }
.primary { background: var(--accent); color: var(--accent-fg); width: 100%; }
.ghost { background: transparent; color: var(--fg); border-color: var(--line); }
.ghost:hover { border-color: var(--accent); }
.copy { display: flex; gap: 8px; }
.copy .primary { width: auto; white-space: nowrap; }
#out textarea { margin-bottom: 12px; }
#again { margin-top: 8px; }
.muted { color: var(--muted); font-size: 14px; }
.err { color: var(--err); min-height: 1.2em; margin: 12px 0 0; font-size: 14px; }
.hidden { display: none !important; }
.features {
  list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); color: var(--muted); font-size: 14px;
}
.features li { border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
.features b { display: block; color: var(--fg); }
footer { margin-top: 32px; text-align: center; color: var(--muted); font-size: 13px; }
footer a { color: var(--accent); }