/* Two columns: controls on the left, a demo email with the live signature on the right (stacks on narrow screens) */
:root {
  --bg: #f3f2f2; --card: #ffffff; --ink: #1a1717; --muted: #6f6868;
  --line: #e5e1e1; --accent: #E3262F; --focus: rgba(227, 38, 47, .2);
  --paper: #ffffff;   /* signatures are designed for a white email body, in both themes */
  --btn: #1a1717; --btn-ink: #ffffff; --ok: #15803d; --ok-ink: #ffffff;
  --warn-bg: #fff4ec; --warn-line: #f6cfb3; --warn-ink: #8a3412;
  --display: "Archivo", "Arial Narrow", Arial, sans-serif;
  --body: "IBM Plex Sans", -apple-system, "Segoe UI", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, monospace;
  --mail-ink: #1f1f1f; --mail-muted: #6b6b6b; --mail-line: #ececec;   /* email body is white in both themes */
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #151313; --card: #1f1c1c; --ink: #f2eeee; --muted: #a39b9b; --line: #353030;
    --focus: rgba(227, 38, 47, .35); --btn: #f2eeee; --btn-ink: #151313; --ok: #22a355;
    --warn-bg: #2a1d14; --warn-line: #5a3a22; --warn-ink: #f3c9a6;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #151313; --card: #1f1c1c; --ink: #f2eeee; --muted: #a39b9b; --line: #353030;
  --focus: rgba(227, 38, 47, .35); --btn: #f2eeee; --btn-ink: #151313; --ok: #22a355;
  --warn-bg: #2a1d14; --warn-line: #5a3a22; --warn-ink: #f3c9a6;
  color-scheme: dark;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.5 var(--body); }
main {
  max-width: 1240px; margin: 0 auto; padding-inline: 16px; padding-block: 32px 64px;
  display: grid; grid-template-columns: minmax(0, 380px) minmax(0, 1fr); gap: 24px; align-items: start;
}
@media (max-width: 960px) { main { grid-template-columns: minmax(0, 1fr); } }
.side { display: grid; gap: 16px; min-width: 0; }

h1 { font: 800 28px/1.1 var(--display); margin: 0; letter-spacing: -.01em; text-wrap: balance; }
h1 span { color: var(--accent); }
.lead { color: var(--muted); margin: 6px 0 0; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 18px; min-width: 0; display: grid; gap: 14px; }

.form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 14px; }
@media (max-width: 420px) { .form { grid-template-columns: 1fr; } }
label, .label { display: block; font-size: 11px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 5px; }
.label { margin: 0; }
input { width: 100%; font: inherit; padding: 9px 11px; border: 1px solid var(--line); border-radius: 7px; background: var(--card); color: var(--ink); }
input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--focus); }
.hint { font-size: 13px; color: var(--muted); margin: 0; }

button { font: inherit; font-weight: 600; font-size: 13px; padding: 8px 14px; border-radius: 7px; cursor: pointer; border: 1px solid var(--line); background: var(--card); color: var(--ink); }
button:hover { filter: brightness(.94); }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button.primary { background: var(--btn); border-color: var(--btn); color: var(--btn-ink); }
button.done { background: var(--ok); border-color: var(--ok); color: var(--ok-ink); }
.btns { display: flex; gap: 8px; flex-wrap: wrap; }

/* Brand picker: one row per brand, colour chip + name */
.brands { display: grid; gap: 6px; }
.brands button { display: flex; align-items: center; gap: 10px; text-align: left; font-weight: 500; padding: 9px 12px; }
.brands button i { width: 10px; height: 10px; border-radius: 2px; background: var(--chip); flex: none; }
.brands button[aria-checked="true"] { border-color: var(--chip); box-shadow: inset 0 0 0 1px var(--chip); font-weight: 600; }

.warn { background: var(--warn-bg); border: 1px solid var(--warn-line); color: var(--warn-ink); border-radius: 10px; padding: 10px 14px; font-size: 13px; }
.howto { font-size: 13px; color: var(--muted); display: grid; gap: 6px; padding-inline: 4px; }
.howto b { color: var(--ink); }
.howto code { font: 12px var(--mono); overflow-wrap: anywhere; }

/* Demo email window */
.mail { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 16px); min-width: 0;
  background: var(--paper); color: var(--mail-ink); border: 1px solid var(--line); border-radius: 12px;
  overflow: hidden; box-shadow: 0 12px 32px -18px rgba(0, 0, 0, .35); }
@media (max-width: 960px) { .mail { position: static; } }
.mail-bar { display: flex; align-items: center; gap: 6px; padding: 10px 14px; background: var(--card); border-bottom: 1px solid var(--line); }
.mail-bar i { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.mail-bar span { margin-left: 8px; font-size: 12px; font-weight: 600; color: var(--muted); letter-spacing: .08em; text-transform: uppercase; }
.mail-head { padding: 14px 24px; border-bottom: 1px solid var(--mail-line); display: grid; gap: 4px; font-size: 13px; }
.mail-head .row { display: flex; gap: 10px; min-width: 0; overflow-wrap: anywhere; }
.mail-head .row span { width: 56px; flex: none; color: var(--mail-muted); }
.mail-body { padding: 24px; overflow-x: auto; }
.letter { font: 14px/1.6 Arial, Helvetica, sans-serif; max-width: 60ch; margin-bottom: 28px; }
.letter p { margin: 0 0 12px; }