/* QR Studio — light/dark aware, no external assets. */

:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --border: #e3e6ea;
  --text: #16181d;
  --muted: #656c78;
  --accent: #2f6feb;
  --accent-text: #ffffff;
  --warn-bg: #fff6e5;
  --warn-border: #f0c56a;
  --warn-text: #6b4a05;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 18, 22, .05), 0 8px 24px rgba(16, 18, 22, .05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1014;
    --surface: #161a21;
    --border: #262c36;
    --text: #e8eaee;
    --muted: #949cab;
    --accent: #5b8dff;
    --accent-text: #0e1014;
    --warn-bg: #2a2313;
    --warn-border: #6b5620;
    --warn-text: #f0ce87;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .3);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap { width: min(1120px, 100% - 2.5rem); margin-inline: auto; }

.masthead { padding: 2.75rem 0 1.5rem; }
.masthead h1 {
  margin: 0 0 .3rem;
  font-size: clamp(1.6rem, 1.1rem + 1.8vw, 2.2rem);
  letter-spacing: -.02em;
}
.masthead p { margin: 0; color: var(--muted); max-width: 62ch; }

.masthead-row {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 1.5rem;
}
.masthead-text { min-width: 0; }

/* language switcher, top right */
.lang {
  flex: none; display: flex; gap: .25rem; padding: .2rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 999px; box-shadow: var(--shadow);
}
.lang button {
  font: inherit; font-size: .74rem; font-weight: 600; letter-spacing: .04em;
  cursor: pointer; padding: .3rem .7rem; border-radius: 999px;
  border: 0; background: none; color: var(--muted);
}
.lang button:hover { color: var(--text); }
.lang button.on { background: var(--accent); color: var(--accent-text); }

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
  gap: 1.25rem;
  align-items: start;
  padding-bottom: 2rem;
}
@media (max-width: 900px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .preview { position: static !important; }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}
.preview { position: sticky; top: 1.25rem; }

.field { margin-bottom: 1.1rem; }
.field:last-child { margin-bottom: 0; }
.field > label {
  display: flex; justify-content: space-between; align-items: baseline; gap: .5rem;
  font-weight: 600; font-size: .82rem; letter-spacing: .01em;
  margin-bottom: .4rem;
}
.hint-inline, output { font-weight: 400; color: var(--muted); font-size: .78rem; }
.hint { margin: .4rem 0 0; font-size: .78rem; color: var(--muted); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: .9rem; }
.subfield { margin-top: .7rem; }

textarea, select, input[type="text"] {
  width: 100%; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; padding: .55rem .65rem;
}
textarea { resize: vertical; font-size: .92rem; }
textarea:focus-visible, select:focus-visible, input:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}

/* colour inputs */
.colorrow { display: flex; gap: .5rem; align-items: center; }
input[type="color"] {
  inline-size: 42px; block-size: 34px; padding: 0; flex: none; cursor: pointer;
  background: none; border: 1px solid var(--border); border-radius: 8px;
}
.hex { text-transform: lowercase; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .84rem; }

/* style picker */
.styles { display: grid; grid-template-columns: repeat(auto-fill, minmax(84px, 1fr)); gap: .5rem; }
.styles button {
  display: grid; gap: .35rem; justify-items: center;
  padding: .5rem .3rem; cursor: pointer;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  font-size: .72rem; font-weight: 500;
}
.styles button:hover { border-color: var(--accent); }
.styles button.on { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.styles svg { display: block; }

/* segmented control */
.segmented { display: grid; grid-template-columns: repeat(4, 1fr); gap: .3rem; }
.segmented button {
  padding: .45rem .2rem; cursor: pointer; font: inherit; font-size: .76rem;
  background: var(--bg); color: var(--muted);
  border: 1px solid var(--border); border-radius: 8px;
}
.segmented button.on { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }

input[type="range"] { width: 100%; accent-color: var(--accent); }

/* buttons */
.btn {
  font: inherit; font-size: .84rem; font-weight: 500; cursor: pointer;
  padding: .5rem .85rem; border-radius: 8px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
.btn.ghost { color: var(--muted); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.file { display: inline-block; }
.filerow, .btnrow { display: flex; gap: .5rem; flex-wrap: wrap; }

/* preview stage */
.stage {
  display: grid; place-items: center;
  background:
    linear-gradient(45deg, var(--border) 25%, transparent 25%, transparent 75%, var(--border) 75%) 0 0/16px 16px,
    linear-gradient(45deg, var(--border) 25%, transparent 25%, transparent 75%, var(--border) 75%) 8px 8px/16px 16px,
    var(--surface);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 1rem; margin-bottom: .9rem; min-height: 260px;
}
.stage svg { width: 100%; height: auto; max-width: 340px; border-radius: 4px; }

.warning {
  background: var(--warn-bg); border: 1px solid var(--warn-border); color: var(--warn-text);
  border-radius: 8px; padding: .6rem .7rem; font-size: .8rem; margin-bottom: .9rem;
}

.exports { display: flex; flex-direction: column; gap: .7rem; }
.field.inline { display: flex; align-items: center; gap: .6rem; margin: 0; }
.field.inline > label { margin: 0; white-space: nowrap; }
.field.inline select { width: auto; }

.meta { margin: .8rem 0 0; font-size: .76rem; color: var(--muted); font-variant-numeric: tabular-nums; }

.foot { padding: 1rem 0 2.5rem; font-size: .78rem; color: var(--muted); }
.foot a { color: inherit; }