/* AviAnki: one mobile-first column. System fonts, no images, colours as tokens. */
:root {
  --bg: #f6f8f3;
  --surface: #ffffff;
  --text: #1c261f;
  --muted: #4b5a50;
  --line: #c9d3c6;
  --accent: #1d6b40;
  --accent-text: #ffffff;
  --link: #14603a;
  --warn-bg: #fdecea;
  --warn-text: #7a1d14;
  --note-bg: #eaf3ec;
  --focus: #0b57d0;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131a15;
    --surface: #1b251e;
    --text: #e9efe9;
    --muted: #b1c0b4;
    --line: #34443a;
    --accent: #6cc890;
    --accent-text: #0d1a11;
    --link: #8fd8ab;
    --warn-bg: #3a1a17;
    --warn-text: #ffc9c2;
    --note-bg: #1f2e24;
    --focus: #8ab4ff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 1.0625rem/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow-wrap: anywhere;
}

header.site, main, footer.site {
  max-width: 40rem;
  margin: 0 auto;
  padding-left: 16px;
  padding-right: 16px;
}

header.site h1 { margin: 0; padding: 20px 0 0; font-size: 1.5rem; letter-spacing: 0.01em; }
main { padding-top: 8px; padding-bottom: 24px; }
h2 { font-size: 1.35rem; line-height: 1.3; margin: 0.6em 0; }
h2.pitch { font-weight: 500; margin-bottom: 0.3em; }
.lede { margin: 0 0 1.2em; }
h3 { font-size: 1.1rem; margin: 1.2em 0 0.4em; }
h4 { font-size: 1rem; margin: 1em 0 0.3em; }
h2:focus, h3:focus { outline: none; }
.noscript { margin: 12px 16px; }

a { color: var(--link); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

.field { margin-top: 1.2em; margin-bottom: 0.4em; }
label { font-weight: 600; }
.field > label { display: block; margin-bottom: 6px; }

select {
  width: 100%;
  min-height: 48px;
  padding: 8px 10px;
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--muted);
  border-radius: 8px;
}

button {
  font: inherit;
  font-weight: 600;
  min-height: 48px;
  padding: 10px 20px;
  border-radius: 8px;
  border: 2px solid var(--accent);
  cursor: pointer;
}
button.primary { background: var(--accent); color: var(--accent-text); width: 100%; margin-top: 8px; }
button.secondary, .downloads button { background: transparent; color: var(--link); }
button:disabled { opacity: 0.55; cursor: not-allowed; }

.hint { color: var(--muted); font-size: 0.95rem; margin: 0.5em 0; }
.problem { color: var(--warn-text); background: var(--warn-bg); padding: 6px 10px; border-radius: 6px; margin: 6px 0; }
.notice { background: var(--note-bg); padding: 10px 12px; border-radius: 8px; }

.error { background: var(--warn-bg); color: var(--warn-text); border-radius: 8px; padding: 4px 14px 14px; margin: 12px 0; }
.error button { color: var(--warn-text); border-color: var(--warn-text); }

details { margin: 1.4em 0; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
details > summary { cursor: pointer; padding: 12px 14px; min-height: 48px; font-weight: 600; }
details > :not(summary) { margin-left: 14px; margin-right: 14px; }
details[open] { padding-bottom: 12px; }
details details { border: 0; background: none; margin: 0.6em 0; }
details details > :not(summary) { margin-left: 0; margin-right: 0; }

fieldset { border: 0; padding: 0; margin: 1em 0; }
legend { font-weight: 600; padding: 0; margin-bottom: 4px; }
.choice { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; padding: 8px 0; min-height: 44px; }
.choice input { width: 22px; height: 22px; margin: 2px 0 0; flex: none; accent-color: var(--accent); }

progress { width: 100%; height: 16px; accent-color: var(--accent); }
.progress-text { font-size: 1.1rem; min-height: 3em; }

.downloads { list-style: none; padding: 0; margin: 12px 0; }
.downloads li { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; padding: 8px 0; border-top: 1px solid var(--line); }
.downloads .name { flex: 1 1 12rem; }

/* The study guide (ADR 0030): ARIA tabs for the device, then the steps. */
.study { margin: 1.6em 0 1em; padding-top: 4px; border-top: 1px solid var(--line); }
.tabs { display: flex; gap: 6px; margin: 0.8em 0 0; }
.tabs button[role="tab"] {
  flex: 1 1 0;
  min-width: 0;
  padding: 8px 6px;
  background: var(--surface);
  color: var(--link);
  border-color: var(--line);
  border-bottom-color: var(--accent);
  border-radius: 8px 8px 0 0;
  font-size: 0.97rem;
  line-height: 1.25;
}
.tabs button[role="tab"][aria-selected="true"] { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.steps { margin: 0 0 1em; padding: 4px 12px 10px; border: 2px solid var(--accent); border-top: 0; border-radius: 0 0 8px 8px; background: var(--surface); }
.steps[hidden] { display: none; }
.steps ol { padding-left: 1.4em; }
.steps li { margin: 0.4em 0; }
.path { margin: 12px 0; padding: 2px 12px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); }
.path h4 { margin: 0.8em 0 0.3em; font-size: 1.05rem; }
.path p { margin: 0.4em 0; }

.box { background: var(--note-bg); border-left: 5px solid var(--accent); border-radius: 8px; padding: 4px 16px 8px; margin: 1.4em 0; }
.box h3, .box h4 { margin-top: 0.8em; }

footer.site { color: var(--muted); font-size: 0.9rem; padding-top: 16px; padding-bottom: 32px; border-top: 1px solid var(--line); }
footer.site p { margin: 0.6em 0; }

.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* Customize your cards (ADR 0028): the look controls and the live preview. */
.customize { margin: 1.6em 0 1em; padding-top: 4px; border-top: 1px solid var(--line); }
.customize h3 { margin-top: 0.9em; }
.custom { margin: 1em 0; padding: 4px 14px 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
.custom[hidden], .theme-text[hidden], .inline-field[hidden] { display: none; }
.swatches { display: grid; grid-template-columns: 1fr 64px 64px; gap: 8px 12px; align-items: center; margin: 1em 0; }
.swatch-head { font-weight: 600; text-align: center; font-size: 0.9rem; }
.swatch-name { overflow-wrap: normal; }
.swatches input[type="color"] { width: 100%; height: 44px; padding: 2px; border: 1px solid var(--muted); border-radius: 8px; background: var(--surface); cursor: pointer; }
.theme-text { width: 100%; font: 0.85rem/1.4 ui-monospace, Menlo, Consolas, monospace; color: var(--text); background: var(--surface); border: 1px solid var(--muted); border-radius: 8px; padding: 8px; }
.preview-bar { display: flex; flex-wrap: wrap; gap: 4px 20px; align-items: center; margin-top: 0.6em; }
.inline-field { display: flex; gap: 8px; align-items: center; }
.inline-field select { width: auto; min-width: 10rem; }
.preview-grid { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; margin-top: 6px; }
.preview-side { flex: 1 1 280px; max-width: 360px; margin: 0; }
.preview-side figcaption { font-weight: 600; font-size: 0.95rem; margin: 0 0 6px; text-align: center; color: var(--muted); }
.preview-frame { display: block; width: 100%; height: 560px; border: 2px solid var(--line); border-radius: 22px; background: #fff; }

@media (min-width: 40rem) {
  button.primary { width: auto; min-width: 16rem; }
}

/* Touch targets: every link and button is at least 44 px tall on a phone. Links inside a sentence
   keep their place in the line and grow only their hit area (vertical padding on an inline box);
   links on a line of their own become 44 px boxes. */
@media (max-width: 40rem), (pointer: coarse) {
  a { padding: 14px 0; }  /* inline padding widens the hit area without moving the text */
  footer.site > p > a, .downloads a {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding-top: 0;
    padding-bottom: 0;
  }
  button { min-height: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
}