:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --ink: #1f2933;
  --muted: #5f6b7a;
  --line: #d5dbe3;
  --accent: #344767;
  --accent-ink: #ffffff;
  --soft: #eef2f7;
  --error: #b42318;
  --error-bg: #fef3f2;
  --warn: #93370d;
  --warn-bg: #fffaeb;
  --ok: #067647;
  --ok-bg: #ecfdf3;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12161c; --card: #1b2129; --ink: #e6e9ee; --muted: #a3adba; --line: #2f3843;
    --accent: #8fa7d1; --accent-ink: #0f141a; --soft: #232b35;
    --error: #fda29b; --error-bg: #3a1a17; --warn: #fec84b; --warn-bg: #3a2c10; --ok: #75e0a7; --ok-bg: #12301f;
  }
}
:root[data-theme="dark"] {
  --bg: #12161c; --card: #1b2129; --ink: #e6e9ee; --muted: #a3adba; --line: #2f3843;
  --accent: #8fa7d1; --accent-ink: #0f141a; --soft: #232b35;
  --error: #fda29b; --error-bg: #3a1a17; --warn: #fec84b; --warn-bg: #3a2c10; --ok: #75e0a7; --ok-bg: #12301f;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 16px; }
.top { background: var(--card); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; gap: 12px; height: 56px; }
.brand { font-weight: 700; color: var(--accent); display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.brand img { display: block; height: 30px; width: auto; }
.badge { font-size: 12px; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 2px 10px; }
h1 { font-size: 28px; line-height: 1.25; margin: 32px 0 12px; }
h2 { font-size: 19px; margin: 0 0 12px; display: flex; align-items: center; gap: 10px; }
h3 { font-size: 15px; margin: 0 0 8px; }
.lead { font-size: 17px; }
.intro { margin-bottom: 8px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 20px; margin: 16px 0; }
.num {
  display: inline-flex; align-items: center; justify-content: center; width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent); color: var(--accent-ink); font-size: 14px;
}
.steps { margin: 0; padding-left: 22px; }
.steps li { margin: 6px 0; }
.hint { color: var(--muted); font-size: 13px; }
.info { background: var(--soft); border-radius: 8px; padding: 10px 12px; margin: 10px 0; }
.keybox { margin-top: 18px; border-left: 3px solid var(--accent); background: var(--soft); padding: 12px 14px; border-radius: 6px; }
.buttons, .row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin: 10px 0; }
button, .button-like {
  font: inherit; border-radius: 8px; padding: 9px 16px; cursor: pointer; border: 1px solid var(--accent);
  display: inline-block;
}
.primary { background: var(--accent); color: var(--accent-ink); margin-top: 12px; }
.secondary, .button-like { background: transparent; color: var(--accent); }
button:disabled { opacity: .6; cursor: progress; }
.file input { display: block; margin: 6px 0; }
.file span { display: none; }
input[type=text], input[type=email], input[type=number], select {
  font: inherit; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 6px;
  padding: 7px 9px; max-width: 100%;
}
input[type=number] { width: 80px; }
.table-scroll { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; }
th, td { border-bottom: 1px solid var(--line); padding: 7px 8px; text-align: left; vertical-align: top; font-size: 14px; }
th { color: var(--muted); font-weight: 600; font-size: 13px; }
td.code { font-family: ui-monospace, Menlo, Consolas, monospace; white-space: nowrap; }
td.count { color: var(--muted); text-align: right; white-space: nowrap; }
.mapping select { width: 100%; min-width: 180px; }
.two { display: grid; gap: 6px; margin-top: 6px; }
.values { margin-top: 18px; }
.preview td, .preview th { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12px; white-space: nowrap; }
.messages .msg { border-radius: 6px; padding: 8px 10px; margin: 8px 0; }
.msg.error { background: var(--error-bg); color: var(--error); }
.msg.warning { background: var(--warn-bg); color: var(--warn); }
.msg.ok { background: var(--ok-bg); color: var(--ok); }
.msg.info { background: var(--soft); }
.progress { height: 6px; background: var(--soft); border-radius: 3px; margin-top: 12px; overflow: hidden; }
.progress div { height: 100%; width: 0; background: var(--accent); transition: width .2s; }
.field { display: grid; gap: 4px; margin: 12px 0; max-width: 460px; }
.field label { font-weight: 600; }
.check { display: flex; gap: 10px; align-items: flex-start; margin: 14px 0 6px; }
.check input { margin-top: 4px; }
details { margin: 12px 0; }
summary { cursor: pointer; color: var(--accent); }
.success { background: var(--ok-bg); border-radius: 8px; padding: 14px 16px; }
.success h3 { color: var(--ok); }
.result { font-family: ui-monospace, Menlo, Consolas, monospace; }
.foot { color: var(--muted); font-size: 13px; padding-top: 8px; padding-bottom: 40px; }
.terms ol { padding-left: 22px; }
.terms li { margin: 8px 0; }
@media (max-width: 640px) {
  h1 { font-size: 23px; }
  .card { padding: 16px; }
  .mapping thead { display: none; }
  .mapping tr { display: block; border-bottom: 1px solid var(--line); padding: 8px 0; }
  .mapping td { display: block; border: 0; padding: 2px 0; }
}