:root {
  --bg: #f6f4ef;
  --surface: #ffffff;
  --ink: #1d1b18;
  --muted: #6b665d;
  --line: #e2ddd3;
  --accent: #d2542c;
  --accent-ink: #ffffff;
  --radius: 14px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161513;
    --surface: #201f1c;
    --ink: #eeeae2;
    --muted: #a39d92;
    --line: #34322d;
    --accent: #f07a50;
    --accent-ink: #161513;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 var(--sans);
}
a { color: var(--accent); }
.wrap { max-width: 860px; margin: 0 auto; padding: 0 16px; }

header.site {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 64px; flex-wrap: wrap;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  color: var(--ink); text-decoration: none; font-weight: 700; font-size: 1.15rem;
}
.brand svg { width: 28px; height: 28px; }
nav.main a {
  color: var(--muted); text-decoration: none; margin-left: 18px; font-size: .95rem;
}
nav.main a:hover, nav.main a[aria-current="page"] { color: var(--ink); }

.hero { padding: 48px 0 8px; }
.hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.15; margin: 0 0 10px; }
.hero p { color: var(--muted); margin: 0; max-width: 60ch; }

.tool {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; margin: 28px 0;
}
.tool label { display: block; font-weight: 600; margin-bottom: 8px; }
.tool textarea {
  width: 100%; min-height: 120px; resize: vertical;
  font: 1.05rem/1.5 var(--sans); color: var(--ink);
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 12px;
}
.tool textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.modes { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }
.modes button, .btn {
  font: inherit; font-size: .92rem; cursor: pointer;
  border: 1px solid var(--line); background: var(--bg); color: var(--ink);
  padding: 7px 14px; border-radius: 999px;
}
.modes button[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.out-row { display: flex; gap: 10px; align-items: flex-start; }
.out-row output {
  flex: 1; min-height: 60px; padding: 12px; border-radius: 10px;
  background: var(--bg); border: 1px dashed var(--line);
  font-size: 1.2rem; word-break: break-word; white-space: pre-wrap;
}
.hint { color: var(--muted); font-size: .88rem; margin-top: 10px; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 8px 0 40px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.card h3 { margin: 0 0 6px; font-size: 1.02rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }

.prose { padding: 40px 0 56px; max-width: 68ch; }
.prose h1 { font-size: 2rem; margin-top: 0; }
.prose h2 { font-size: 1.2rem; margin-top: 2em; }
.prose code { font-family: var(--mono); font-size: .9em; background: var(--surface); padding: 1px 5px; border-radius: 4px; border: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); padding: 14px 0; }
details summary { cursor: pointer; font-weight: 600; }
details p { color: var(--muted); margin: 8px 0 0; }

table.chars { border-collapse: collapse; width: 100%; font-size: .95rem; }
table.chars td { border: 1px solid var(--line); padding: 6px 10px; text-align: center; }

footer.site { border-top: 1px solid var(--line); color: var(--muted); font-size: .88rem; padding: 22px 0 32px; }
footer.site .wrap { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
footer.site a { color: var(--muted); }

.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%) translateY(20px);
  background: var(--ink); color: var(--bg); padding: 8px 16px; border-radius: 999px;
  font-size: .9rem; opacity: 0; transition: .2s; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 560px) {
  nav.main a { margin: 0 14px 0 0; }
  .out-row { flex-direction: column; align-items: stretch; }
  .out-row .btn { align-self: flex-end; }
}