:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --ink: #111827;
  --muted: #4b5563;
  --line: #d9dde3;
  --accent: #1d4ed8;
  --accent-ink: #ffffff;
  --soft: #eef2ff;
  --warn-bg: #fff7ed;
  --warn-ink: #9a3412;
  --focus: #f59e0b;
  --radius: 10px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --panel: #111a2e;
    --ink: #e5e7eb;
    --muted: #a3acb9;
    --line: #2a3550;
    --accent: #60a5fa;
    --accent-ink: #0b1120;
    --soft: #1a2540;
    --warn-bg: #3a2210;
    --warn-ink: #fdba74;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}
a { color: var(--accent); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--panel); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px; }
.top { padding: 28px 0 12px; }
.top h1 { margin: 0 0 6px; font-size: clamp(1.6rem, 4vw, 2.2rem); line-height: 1.2; }
.lede { margin: 0; color: var(--muted); max-width: 62ch; }

.tool { display: grid; gap: 16px; padding-bottom: 32px; }
@media (min-width: 960px) {
  .tool { grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); align-items: start; }
  .sticky { position: sticky; top: 12px; }
}
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; min-width: 0; }

fieldset { border: 0; margin: 0 0 18px; padding: 0; min-width: 0; }
legend { font-weight: 700; font-size: 1.05rem; margin-bottom: 8px; padding: 0; }
label { display: block; font-size: 0.9rem; font-weight: 600; margin-bottom: 10px; }
.opt { font-weight: 400; color: var(--muted); font-size: 0.8rem; }
input, select, textarea {
  display: block; width: 100%; margin-top: 4px;
  font: inherit; font-weight: 400; font-size: 0.95rem;
  color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px;
}
textarea { resize: vertical; }
.grid2 { display: grid; gap: 0 12px; }
@media (min-width: 520px) { .grid2 { grid-template-columns: 1fr 1fr; } }
.hint { margin: 0 0 10px; font-size: 0.88rem; color: var(--muted); }

.colour { margin-bottom: 10px; }
.colour > label { margin-bottom: 0; }
.colour .row { display: flex; gap: 8px; align-items: center; }
.colour input[type="color"] { width: 48px; height: 40px; padding: 2px; flex: none; cursor: pointer; }
.colour input[type="text"], .colour input:not([type]) { font-family: ui-monospace, Menlo, Consolas, monospace; }

.tpl-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
@media (min-width: 520px) { .tpl-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.tpl-card {
  position: relative; margin: 0; padding: 10px 8px; text-align: center;
  border: 1px solid var(--line); border-radius: 8px; cursor: pointer;
  font-size: 0.85rem; background: var(--bg);
}
.tpl-card input { position: absolute; opacity: 0; width: 1px; height: 1px; margin: 0; }
.tpl-card.on { border-color: var(--accent); background: var(--soft); box-shadow: inset 0 0 0 1px var(--accent); }
.tpl-card:has(input:focus-visible) { outline: 3px solid var(--focus); outline-offset: 2px; }

.warn { background: var(--warn-bg); color: var(--warn-ink); border-radius: 8px; padding: 10px 12px 10px 28px; font-size: 0.88rem; margin: 6px 0 0; }
.small-actions { display: flex; gap: 16px; flex-wrap: wrap; }

button {
  font: inherit; font-size: 0.92rem; font-weight: 600;
  padding: 9px 14px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--line); background: var(--bg); color: var(--ink);
}
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
button.link { background: none; border: 0; padding: 4px 0; color: var(--accent); text-decoration: underline; font-weight: 500; }

.pv-title { margin: 0 0 8px; font-size: 1.1rem; }
.pv-tools { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-bottom: 10px; }
.seg { display: flex; gap: 2px; margin: 0; border: 1px solid var(--line); border-radius: 8px; padding: 2px; }
.seg label { margin: 0; font-weight: 500; font-size: 0.85rem; padding: 4px 10px; border-radius: 6px; cursor: pointer; }
.seg input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.seg label:has(input:checked) { background: var(--soft); color: var(--accent); }
.seg label:has(input:focus-visible) { outline: 3px solid var(--focus); }

.pv-frame { background: #e5e7eb; border-radius: 8px; padding: 12px; overflow-x: auto; }
.pv-mail { background: #ffffff; color: #1f2937; border-radius: 6px; padding: 18px; margin: 0 auto; max-width: 100%; }
.pv-frame.narrow .pv-mail { max-width: 360px; }
.pv-frame.dark { background: #000000; }
.pv-frame.dark .pv-mail { background: #1e1e1e; color: #e5e5e5; }
.pv-body { margin: 0 0 16px; font: 14px/1.5 Arial, Helvetica, sans-serif; }
#preview { overflow-x: auto; }

.note { font-size: 0.85rem; color: var(--muted); margin: 8px 0; }
.note.bad { color: #b91c1c; font-weight: 600; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; }
.status { min-height: 1.5em; margin: 8px 0; font-weight: 600; color: var(--accent); }
details { margin: 8px 0; }
summary { cursor: pointer; font-weight: 600; }
details textarea { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 0.8rem; }
.privacy { font-size: 0.85rem; color: var(--muted); margin: 12px 0 0; }

.content { max-width: 820px; padding-bottom: 32px; }
.content h2 { font-size: 1.4rem; margin: 36px 0 10px; line-height: 1.25; }
.content h3 { font-size: 1.1rem; margin: 6px 0 8px; }
.content li { margin-bottom: 6px; }
.steps { padding-left: 1.3em; }

.tabs { display: flex; flex-wrap: wrap; gap: 6px; margin: 14px 0 0; }
.tabs [role="tab"] { font-size: 0.88rem; padding: 7px 12px; }
.tabs [role="tab"][aria-selected="true"] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.tabpanel { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: 14px 16px; margin-top: 10px; }

.table-wrap { overflow-x: auto; }
.ref { width: 100%; border-collapse: collapse; font-size: 0.92rem; background: var(--panel); }
.ref caption { text-align: left; font-weight: 600; padding: 0 0 8px; }
.ref th, .ref td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.ref th { background: var(--soft); }
.small { font-size: 0.85rem; color: var(--muted); }
#faq details { border-bottom: 1px solid var(--line); padding: 10px 0; margin: 0; }
#faq details p { margin: 8px 0 0; }
.updated { color: var(--muted); font-size: 0.9rem; margin-top: 28px; }

.foot { border-top: 1px solid var(--line); padding: 20px 0 36px; font-size: 0.92rem; }
.more-h { font-weight: 700; margin: 16px 0 6px; }
.more { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px 18px; }