:root {
  --bg: #0d1117;
  --panel: #161b22;
  --panel-2: #1c2330;
  --text: #e6edf3;
  --muted: #9aa7b8;
  --accent: #c472ed;
  --accent-2: #7c5cff;
  --good: #2ec27e;
  --border: #2a3242;
  --radius: 14px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px; border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: rgba(13,17,23,0.9);
  backdrop-filter: blur(8px); z-index: 10;
}
.brand { font-weight: 800; font-size: 1.1rem; }
.site-header nav a { margin-left: 18px; color: var(--muted); font-size: 0.95rem; }

main { max-width: 980px; margin: 0 auto; padding: 24px; }

.hero { text-align: center; margin: 18px 0 26px; }
.hero h1 { font-size: clamp(1.7rem, 4vw, 2.6rem); margin: 0 0 10px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .sub { color: var(--muted); max-width: 620px; margin: 0 auto; }

.ad-slot {
  border: 1px dashed var(--border); border-radius: var(--radius);
  background: var(--panel); display: flex; align-items: center; justify-content: center;
  color: var(--muted); font-size: 0.85rem; margin: 22px 0; min-height: 100px;
}
.ad-placeholder { opacity: 0.7; }

.tool { display: grid; grid-template-columns: 1fr 1.2fr; gap: 22px; margin: 10px 0 8px; }
.controls {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px;
}
.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 600; margin-bottom: 8px; }
.field output { color: var(--accent); font-variant-numeric: tabular-nums; }

select, input[type="range"], input[type="text"] { width: 100%; }
select, input[type="text"] {
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 10px 12px; font-size: 0.95rem; font-family: inherit;
}
input[type="text"]::placeholder { color: var(--muted); }
input[type="range"] { accent-color: var(--accent); height: 6px; cursor: pointer; }

.btn {
  width: 100%; padding: 12px; border: none; border-radius: 10px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #fff; font-weight: 700; font-size: 1rem; cursor: pointer;
}
.btn:hover { opacity: 0.92; }
.btn-small { width: auto; padding: 8px 14px; font-size: 0.85rem; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.results {
  background: linear-gradient(160deg, var(--panel-2), var(--panel));
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; align-self: start;
}
.results-head { display: flex; justify-content: space-between; align-items: center; }
.results-head h2 { margin: 0 0 12px; font-size: 1.05rem; }
.output {
  background: var(--bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 14px; min-height: 120px; color: var(--text);
  font-size: 0.95rem; word-break: break-word;
}
.output .tag {
  display: inline-block; background: rgba(196,114,237,0.12);
  border: 1px solid var(--border); color: var(--accent);
  border-radius: 8px; padding: 4px 9px; margin: 3px; font-size: 0.9rem;
}
.copied-msg { color: var(--good); font-size: 0.85rem; margin-top: 8px; }
.hint { color: var(--muted); font-size: 0.8rem; margin: 12px 0 0; }

.info {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px 26px; margin: 22px 0;
}
.info h2 { margin-top: 0; }
details { border-bottom: 1px solid var(--border); padding: 10px 0; }
summary { cursor: pointer; font-weight: 600; }
details p { color: var(--muted); margin: 8px 0 0; }

.site-footer { text-align: center; color: var(--muted); font-size: 0.82rem;
  padding: 30px 20px; border-top: 1px solid var(--border); margin-top: 20px; }

@media (max-width: 760px) {
  .tool { grid-template-columns: 1fr; }
  .site-header nav a { margin-left: 12px; }
}