:root {
  --red: #e41e26;
  --red-dark: #b8151c;
  --bg: #f4f2ef;
  --panel: #ffffff;
  --text: #1d1d1d;
  --muted: #666;
  --border: #d9d5cf;
  --input-bg: #ffffff;
  --code-bg: #f6f6f6;
  --warn-bg: #fff7d6;
  --warn-border: #e8cf6a;
  --warn-text: #5c4a00;
  --ph-bg: #fff1a8;
  --radius: 8px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161514;
    --panel: #22201f;
    --text: #eeeae6;
    --muted: #a8a29c;
    --border: #3d3a37;
    --input-bg: #1a1918;
    --code-bg: #1a1918;
    --warn-bg: #3a3114;
    --warn-border: #6b5a1f;
    --warn-text: #f3e2a4;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.site-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 24px;
  border-bottom: 4px solid var(--red);
  background: var(--panel);
}
.site-header h1 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
  align-items: start;
}
@media (max-width: 900px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
    padding: 16px;
  }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.panel h2 {
  margin: 0 0 16px;
  font-size: 16px;
}
.output {
  position: sticky;
  top: 16px;
}
@media (max-width: 900px) {
  .output {
    position: static;
  }
}

.field {
  display: block;
  margin-bottom: 14px;
}
.field-pair {
  display: flex;
  gap: 12px;
}
.field-pair .field {
  flex: 1 1 0;
  min-width: 0;
}
.field > span {
  display: block;
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 4px;
}
.field em,
.hint {
  font-weight: 400;
  font-style: normal;
  color: var(--muted);
  font-size: 13px;
}

input[type="text"],
textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--input-bg);
  color: var(--text);
  font: inherit;
}
textarea {
  resize: vertical;
  font-size: 13px;
}
input:focus,
textarea:focus {
  outline: 2px solid var(--red);
  outline-offset: -1px;
  border-color: transparent;
}

.group {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 20px 0 0;
  padding: 16px 0 0;
}
.group legend {
  font-weight: 600;
  padding: 0;
  float: left;
  width: 100%;
  margin-bottom: 4px;
}
.group legend + * {
  clear: both;
}
.hint {
  margin: 0 0 10px;
}
.hint a {
  color: inherit;
}
.preset-row + .preset-row,
.preset-row .preset-row {
  margin: 0;
}
code {
  font-size: 12px;
  background: var(--code-bg);
  padding: 1px 4px;
  border-radius: 4px;
}

.rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 10px;
}
.row {
  display: flex;
  gap: 8px;
  align-items: flex-start;
}
.contact-row .label-input {
  flex: 0 0 32%;
}
.contact-row .value-input {
  flex: 1 1 auto;
  min-width: 0;
}
.contact-row .ext-input {
  flex: 0 0 64px;
  min-width: 0;
}
.note-row .note-input {
  flex: 1 1 auto;
  min-width: 0;
}
.row-tools {
  display: flex;
  gap: 2px;
  align-items: center;
  flex-shrink: 0;
}
.note-row .row-tools {
  flex-direction: column;
  align-items: stretch;
}
.italic-toggle {
  font-size: 12px;
  white-space: nowrap;
  display: flex;
  gap: 4px;
  align-items: center;
}

.btn,
.icon-btn {
  font: inherit;
  cursor: pointer;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
}
.btn {
  padding: 8px 14px;
  font-weight: 600;
  font-size: 14px;
}
.btn.small {
  padding: 4px 10px;
  font-size: 13px;
}
.btn:hover,
.icon-btn:hover {
  border-color: var(--muted);
}
.btn.primary {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
}
.btn.primary:hover {
  background: var(--red-dark);
  border-color: var(--red-dark);
}
.btn.ghost {
  background: transparent;
}
.btn.danger,
.icon-btn.danger {
  color: var(--red);
}
.icon-btn {
  width: 30px;
  height: 30px;
  padding: 0;
  font-size: 13px;
  background: transparent;
}

@media (max-width: 520px) {
  .panel {
    padding: 14px;
  }
  .row,
  .row-tools {
    gap: 4px;
  }
  .contact-row {
    flex-wrap: wrap;
  }
  .contact-row .label-input {
    flex-basis: 30%;
  }
  .contact-row .value-input {
    flex-basis: 55%;
  }
  .contact-row .row-tools {
    margin-left: auto;
  }
  .icon-btn {
    width: 26px;
  }
  .preview-frame {
    padding: 12px;
  }
}

.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}
.preset-row .hint {
  margin: 0 0 0 8px;
}

.form-footer {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* The preview is always white, like an email body. */
.preview-frame {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 24px;
  overflow-x: auto;
}
.sig-preview .ph {
  background: var(--ph-bg);
  outline: 1px dashed #c9a800;
}

.warning {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  color: var(--warn-text);
  border-radius: 6px;
  padding: 8px 12px;
  margin-bottom: 12px;
  font-size: 13px;
}
.warning p {
  margin: 0;
}
.warning p + p {
  margin-top: 4px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.status {
  min-height: 1.5em;
  margin: 8px 0 0;
  font-size: 13px;
  color: #1f7a3a;
}
.status.error {
  color: var(--red);
}
@media (prefers-color-scheme: dark) {
  .status {
    color: #6fd28f;
  }
}

.help {
  margin-top: 12px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
  font-size: 14px;
}
.help summary {
  cursor: pointer;
  font-weight: 600;
}
.help ol {
  padding-left: 20px;
}
.code {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px;
  font-size: 11px;
  max-height: 320px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-all;
}