:root {
  --ink: #34374a;
  --body: #4a4e46;
  --bg: #eef1ec;
  --paper: #fdfdfb;
  --moss-700: #3f6b46;
  --moss-400: #83b389;
  --moss-100: #e3ecdf;
  --line: #d3dac9;
  --stamp: #b2402c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, "Segoe UI", Arial, sans-serif;
  background: var(--bg);
  color: var(--body);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.topbar .logo {
  height: 26px;
  display: block;
}

.crumb {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--body);
  display: flex;
  gap: 8px;
}

.crumb a {
  color: var(--moss-700);
  text-decoration: none;
}

.crumb a:hover {
  text-decoration: underline;
}

.crumb .here {
  color: var(--ink);
  font-weight: 600;
}

.page-intro {
  max-width: 1180px;
  padding: 32px 32px 0;
}

.eyebrow {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--moss-700);
  margin: 0 0 8px;
}

.page-intro h1 {
  font-family: "IBM Plex Mono", monospace;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 6px;
}

.page-intro .sub {
  margin: 0;
  font-size: 14px;
  color: var(--body);
}

main {
  max-width: 1180px;
  display: flex;
  gap: 28px;
  padding: 24px 32px 64px;
  align-items: flex-start;
  flex-wrap: wrap;
}

.form-pane {
  flex: 1 1 380px;
  min-width: 320px;
  max-width: 460px;
}

.preview-pane {
  flex: 1 1 480px;
  position: sticky;
  top: 20px;
}

fieldset {
  border: 1px solid var(--line);
  border-radius: 4px;
  margin: 0 0 16px;
  padding: 14px 16px 18px;
  background: var(--paper);
}

legend {
  padding: 2px 8px;
  font-family: "IBM Plex Mono", monospace;
  font-weight: 600;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--moss-700);
  background: var(--moss-100);
  border-radius: 3px;
}

.field {
  margin-bottom: 12px;
}

.field label {
  display: block;
  font-size: 12.5px;
  margin-bottom: 4px;
  color: #565a52;
}

.field input[type="text"],
.field input[type="date"],
.field textarea {
  width: 100%;
  padding: 7px 9px;
  border: 1px solid var(--line);
  border-radius: 3px;
  font-size: 14px;
  font-family: inherit;
  color: var(--ink);
  background: #fff;
}

.field textarea {
  resize: vertical;
}

.field input[type="text"]:focus,
.field input[type="date"]:focus,
.field textarea:focus {
  outline: 2px solid var(--moss-400);
  outline-offset: 1px;
  border-color: var(--moss-700);
}

.field.money {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

.field.money .money-part {
  flex: 1;
}

.field.money .money-part.pence {
  flex: 0 0 70px;
}

.field.money input {
  width: 100%;
}

.toggle-group {
  display: flex;
  gap: 16px;
}

.toggle-group label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  margin: 0;
}

#downloadBtn {
  width: 100%;
  padding: 13px;
  background: var(--moss-700);
  color: #fff;
  border: 0;
  border-radius: 4px;
  font-family: "IBM Plex Mono", monospace;
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.15s ease;
}

#downloadBtn:hover {
  background: #335939;
}

#downloadBtn:focus-visible {
  outline: 2px solid var(--moss-400);
  outline-offset: 2px;
}

.tabs {
  display: flex;
  gap: 4px;
  padding-left: 12px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-bottom: none;
  background: var(--moss-100);
  color: var(--body);
  border-radius: 5px 5px 0 0;
  cursor: pointer;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  font-weight: 600;
  position: relative;
  top: 1px;
}

.tab-btn.active {
  background: var(--paper);
  color: var(--moss-700);
  border-bottom: 1px solid var(--paper);
}

.paper {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0 4px 4px 4px;
  padding: 6px;
  box-shadow: 0 12px 28px rgba(52, 55, 74, 0.12);
}

#preview {
  width: 100%;
  max-width: 640px;
  display: block;
  border-radius: 2px;
}

.stamp {
  position: absolute;
  top: -14px;
  right: 18px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stamp);
  border: 2px solid var(--stamp);
  border-radius: 4px;
  padding: 4px 10px;
  background: var(--paper);
  transform: rotate(-6deg);
  pointer-events: none;
}

@media (max-width: 760px) {
  .page-intro,
  main {
    padding-left: 20px;
    padding-right: 20px;
  }
  .preview-pane {
    position: static;
  }
}