:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef1f4;
  --border: #d9dee4;
  --text: #1f2328;
  --muted: #5b6570;
  --accent: #1f6feb;
  --accent-text: #ffffff;
  --danger: #c93c37;
  --focus: #1f6feb66;
  --radius: 10px;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.05), 0 4px 16px rgb(0 0 0 / 0.04);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --surface: #171b21;
    --surface-2: #222831;
    --border: #2f3742;
    --text: #e6e9ed;
    --muted: #9aa4af;
    --accent: #4c8dff;
    --accent-text: #0b1220;
    --danger: #ff7b72;
    --focus: #4c8dff66;
    --shadow: none;
    color-scheme: dark;
  }
}

* { 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;
}

.top {
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px 16px 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand { display: flex; align-items: center; gap: 14px; }
.logo { width: 36px; height: 36px; color: var(--accent); flex: none; }
h1 { margin: 0; font-size: 1.35rem; letter-spacing: -0.01em; }
.lead { margin: 2px 0 0; color: var(--muted); }
h2 { margin: 0; font-size: 1.05rem; }

.lang { display: flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; flex: none; }
.lang button { border: 0; border-radius: 0; padding: 6px 10px; background: var(--surface); }
.lang button[aria-pressed="true"] { background: var(--accent); color: var(--accent-text); }

.layout {
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 20px;
  align-items: start;
}

.editor { display: grid; gap: 16px; }

fieldset, .card {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  min-width: 0;
}

legend {
  float: left;
  width: 100%;
  margin: 0 0 12px;
  padding: 0;
  font-weight: 600;
}

.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; clear: both; }
.wide { grid-column: 1 / -1; }

label { display: grid; gap: 4px; font-size: 0.87rem; color: var(--muted); }
fieldset > label.wide { clear: both; }

input, select, textarea, button, .button {
  font: inherit;
  color: var(--text);
}

input:not([type="range"]):not([type="color"]):not([type="radio"]), select, textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

textarea { resize: vertical; }
input[type="color"] { width: 100%; height: 38px; padding: 2px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
input[type="range"] { width: 100%; accent-color: var(--accent); }
input[aria-invalid] { border-color: var(--danger) !important; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 1px; }

button, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text);
}
button:hover, .button:hover { border-color: var(--muted); }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
button.ghost, .button.ghost { background: transparent; }
button.danger { color: var(--danger); }

.hint { margin: 6px 0 0; font-size: 0.8rem; color: var(--muted); }

.photo { display: flex; gap: 16px; align-items: center; clear: both; margin-bottom: 12px; }
#photoCanvas {
  width: 120px;
  height: 120px;
  flex: none;
  cursor: grab;
  touch-action: none;
  background: repeating-conic-gradient(var(--surface-2) 0 25%, transparent 0 50%) 0 0 / 16px 16px;
  border-radius: 8px;
}
#photoCanvas:active { cursor: grabbing; }
.photo-controls { display: grid; gap: 10px; flex: 1; min-width: 0; }
.row { display: flex; gap: 8px; flex-wrap: wrap; }

.output { position: sticky; top: 16px; display: grid; gap: 16px; }

.card-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }

.segmented { display: inline-flex; align-items: center; gap: 0; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; font-size: 0.85rem; }
.seg-label { padding: 5px 10px; color: var(--muted); border-right: 1px solid var(--border); }
.segmented label { display: block; color: var(--text); }
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented label span { display: block; padding: 5px 10px; cursor: pointer; }
.segmented input:checked + span { background: var(--accent); color: var(--accent-text); }
.segmented input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: -3px; }

/* The preview always looks like a light email body, independent of the page theme. */
.mail {
  margin: 12px 0 16px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px 20px;
  overflow-x: auto;
  color-scheme: light;
}
.mail-body { min-height: 96px; }

.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.actions.subtle { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--border); }

.status { min-height: 1.4em; margin: 10px 0 0; font-size: 0.87rem; color: var(--accent); }
.status.error { color: var(--danger); }

.guides h2 { margin-bottom: 8px; }
details { border-top: 1px solid var(--border); padding: 8px 0; }
details:first-of-type { border-top: 0; }
summary { cursor: pointer; font-weight: 600; font-size: 0.93rem; }
details ol, details ul { margin: 8px 0 4px; padding-left: 22px; font-size: 0.88rem; color: var(--muted); }
details li + li { margin-top: 4px; }

.foot { max-width: 1280px; margin: 0 auto; padding: 8px 16px 32px; color: var(--muted); font-size: 0.85rem; }
.foot p { margin: 4px 0; }
.credit { color: var(--text); }

@media (max-width: 900px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .output { position: static; }
}

@media (max-width: 520px) {
  .grid { grid-template-columns: minmax(0, 1fr); }
  .top { align-items: flex-start; }
  .lead { display: none; }
}