:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --card: #ffffff;
  --fg: #1c1f24;
  --muted: #5d6470;
  --line: #e1e4ea;
  --accent: #0b5fff;
  --accent-fg: #ffffff;
  --ok: #157347;
  --err: #b42318;
  --err-bg: #fdecea;
  --code-bg: #eef1f5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --card: #171b21;
    --fg: #e7eaee;
    --muted: #9aa3ad;
    --line: #2a313a;
    --accent: #5b8cff;
    --accent-fg: #0b0f14;
    --ok: #4cc38a;
    --err: #ff7b72;
    --err-bg: #3a1d1b;
    --code-bg: #0f1216;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.5 system-ui, "Segoe UI", Roboto, Arial, sans-serif; }
a { color: var(--accent); }
header, footer { max-width: 56rem; margin: 0 auto; padding: 1rem 1.25rem; }
header { display: flex; align-items: baseline; justify-content: space-between; }
header .brand { font-weight: 700; font-size: 1.1rem; letter-spacing: .02em; }
header .brand span { color: var(--muted); font-weight: 400; margin-left: .5rem; }
footer { color: var(--muted); font-size: .9rem; }
main { max-width: 56rem; margin: 0 auto; padding: 0 1.25rem 2rem; display: grid; gap: 1.25rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 1.5rem; }
.card h1 { margin: 0 0 .25rem; font-size: 1.6rem; }
.card h2 { margin: 0 0 .5rem; font-size: 1.15rem; }
.lead { color: var(--muted); margin: 0 0 1rem; }
code, pre { font-family: ui-monospace, Consolas, "Cascadia Mono", Menlo, monospace; }
code { background: var(--code-bg); padding: .1em .35em; border-radius: 4px; font-size: .92em; }
pre { background: var(--code-bg); padding: .75rem 1rem; border-radius: 8px; overflow-x: auto; }
textarea, input[type=text], input[type=email], input[type=number], input[type=date], select {
  width: 100%; padding: .6rem .75rem; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--fg); font: inherit;
}
textarea { min-height: 4.5rem; resize: vertical; font-family: ui-monospace, Consolas, Menlo, monospace; font-size: .9rem; }
label { display: block; margin: .75rem 0 0; font-weight: 600; font-size: .95rem; }
label > input, label > textarea, label > select { margin-top: .3rem; font-weight: 400; }
.row { display: grid; gap: 1rem; grid-template-columns: 1fr 1fr; }
@media (max-width: 40rem) { .row { grid-template-columns: 1fr; } }
.hint { color: var(--muted); font-size: .9rem; margin: .35rem 0 0; }
.file { display: inline-block; margin-top: .5rem; font-weight: 500; color: var(--accent); cursor: pointer; }
.file input { display: none; }
button { font: inherit; padding: .65rem 1.1rem; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--fg); cursor: pointer; }
button.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); font-weight: 600; }
button.danger { color: var(--err); }
button:disabled { opacity: .55; cursor: not-allowed; }
.actions { display: flex; gap: .75rem; flex-wrap: wrap; margin-top: 1rem; align-items: center; }
.error { color: var(--err); background: var(--err-bg); border-radius: 8px; padding: .6rem .8rem; margin-top: .75rem; }
.ok { color: var(--ok); }
.summary { margin: 1rem 0 0; padding: .9rem 1rem; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); }
.summary dl { display: grid; grid-template-columns: max-content 1fr; gap: .25rem 1rem; margin: 0; }
.summary dt { color: var(--muted); }
.summary dd { margin: 0; font-family: ui-monospace, Consolas, Menlo, monospace; font-size: .95rem; }
.ts { margin-top: 1rem; min-height: 0; }
.notice { border-left: 3px solid var(--accent); padding: .5rem .9rem; color: var(--muted); margin: 0 0 1rem; }
.result { margin-top: 1rem; padding: 1rem; border-radius: 8px; border: 1px solid var(--ok); }
.result h3 { margin: 0 0 .5rem; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { text-align: left; padding: .45rem .5rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
.tabs { display: flex; gap: .25rem; flex-wrap: wrap; margin-bottom: 1rem; }
.tabs button[aria-selected=true] { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.mono { font-family: ui-monospace, Consolas, Menlo, monospace; font-size: .9em; }
.muted { color: var(--muted); }
.wrap { overflow-x: auto; }
.pill { display: inline-block; padding: .05rem .5rem; border-radius: 999px; font-size: .8rem; border: 1px solid var(--line); }
.pill.ok { border-color: var(--ok); }
.pill.bad { border-color: var(--err); color: var(--err); }
.small { font-size: .95rem; }
.plans { display: grid; gap: .6rem; margin: .5rem 0 1rem; }
.plan { display: grid; grid-template-columns: auto 1fr; gap: .75rem; align-items: start; padding: .8rem 1rem; border: 1px solid var(--line); border-radius: 10px; margin: 0; font-weight: 400; cursor: pointer; }
.plan:has(input:checked) { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }
.plan.off { opacity: .6; }
.plan input { margin-top: .3rem; }
.plan-head { display: flex; justify-content: space-between; gap: 1rem; align-items: baseline; }
.plan .price { font-weight: 600; white-space: nowrap; }