:root {
  --bg: #0d1117;
  --fg: #e6edf3;
  --muted: #8b949e;
  --accent: #f78166;
  --card: #161b22;
  --border: #30363d;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, #1b2230 0%, var(--bg) 60%);
  color: var(--fg);
  min-height: 100vh;
  padding-bottom: 60px;
}

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; border-bottom: 1px solid var(--border);
}
.brand { font-size: 1.2rem; font-weight: 800; color: var(--fg); text-decoration: none; }
.dot { color: var(--accent); }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 0.95rem; }
nav a.active, nav a:hover { color: var(--fg); }

.wrap { max-width: 1000px; margin: 0 auto; padding: 40px 24px; }
h1 { font-size: 2.2rem; letter-spacing: -0.02em; }
.lead { color: var(--muted); margin-top: 10px; line-height: 1.6; }

.grid {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.tool {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
}
.tool h2 { font-size: 1.05rem; margin-bottom: 14px; }

textarea, input[type=text], input:not([type=color]):not([type=checkbox]) {
  width: 100%;
  background: #0d1117;
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: 8px;
  padding: 10px 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
  resize: vertical;
}
textarea { min-height: 84px; margin-bottom: 10px; }

.row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
button {
  background: var(--accent);
  color: #0d1117;
  border: 0;
  font-weight: 700;
  padding: 9px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
}
button:hover { filter: brightness(1.06); }

output {
  display: block;
  margin-top: 8px;
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
  color: var(--fg);
  white-space: pre-wrap;
  word-break: break-all;
  min-height: 20px;
}
.chk { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); font-size: 0.82rem; margin-bottom: 8px; }

.swatch { width: 100%; height: 46px; border-radius: 8px; border: 1px solid var(--border); margin: 10px 0; }

.foot {
  max-width: 1000px; margin: 40px auto 0; padding: 20px 24px 0;
  border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; gap: 12px;
  color: var(--muted); font-size: 0.8rem; flex-wrap: wrap;
}

@media (max-width: 480px) {
  .wrap { padding: 28px 16px; }
  h1 { font-size: 1.8rem; }
}