/* AiNKI: grayscale only, high contrast, no motion. Works on e-ink and phones. */
:root {
  --fg: #000;
  --bg: #fff;
  --muted: #444;
  --soft: #e6e6e6;
  --scale: 1;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fg: #fff;
    --bg: #000;
    --muted: #c4c4c4;
    --soft: #262626;
  }
}

*, *::before, *::after {
  box-sizing: border-box;
  /* E-ink panels ghost on every frame; never animate. */
  transition: none !important;
  animation: none !important;
  scroll-behavior: auto !important;
}

html {
  font-size: calc(18px * var(--scale));
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
}

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1rem 1rem 4rem;
}

h1 { font-size: 1.6rem; margin: 1rem 0 .75rem; line-height: 1.2; }
h2 { font-size: 1.2rem; margin: 2rem 0 .5rem; border-bottom: 2px solid var(--fg); padding-bottom: .2rem; }
a { color: inherit; text-decoration: underline; text-underline-offset: .15em; text-decoration-thickness: 2px; }
code, pre { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .9em; }
pre { white-space: pre-wrap; word-break: break-all; border: 2px solid var(--fg); padding: .75rem; margin: .5rem 0; }
pre.copy { user-select: all; -webkit-user-select: all; }
hr { border: 0; border-top: 2px solid var(--fg); }

.muted { color: var(--muted); }
.small { font-size: .85rem; }
.grow { flex: 1; min-width: 0; overflow-wrap: anywhere; }

/* Navigation */
nav.top {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 3px solid var(--fg);
  max-width: 40rem;
  margin: 0 auto;
}
nav.top a {
  flex: 1 1 auto;
  text-align: center;
  padding: .8rem .5rem;
  text-decoration: none;
  font-weight: 600;
  min-height: 3rem;
}
nav.top a.brand { font-weight: 800; letter-spacing: .05em; }
nav.top a:hover, nav.top a:focus-visible { background: var(--fg); color: var(--bg); }
.brand-big { font-size: 2.4rem; letter-spacing: .08em; margin-bottom: 0; }

/* Controls */
.btn, button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  min-height: 3rem;
  padding: .55rem 1.1rem;
  border: 2px solid var(--fg);
  border-radius: .35rem;
  background: var(--bg);
  color: var(--fg);
  font: inherit;
  font-weight: 650;
  text-decoration: none;
  cursor: pointer;
  touch-action: manipulation;
}
.btn.primary { background: var(--fg); color: var(--bg); }
.btn.danger { border-style: dashed; }
.btn.wide { display: flex; width: 100%; margin: 1rem 0; font-size: 1.1rem; }
button.link { border: 0; padding: 0; min-height: 0; background: none; text-decoration: underline; font-weight: 400; }
.btn:active { background: var(--fg); color: var(--bg); }
.btn.primary:active { background: var(--bg); color: var(--fg); }
:focus-visible { outline: 3px solid var(--fg); outline-offset: 3px; }

.actions { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1rem 0; }

form { margin: .5rem 0 1rem; }
label { display: block; margin: 0 0 .9rem; font-weight: 600; }
label.check { display: flex; gap: .6rem; align-items: center; font-weight: 400; min-height: 2.5rem; }
label.check.indent { padding-left: 1.8rem; }
label.check input { width: 1.4rem; height: 1.4rem; margin: 0; accent-color: var(--fg); flex: none; }
fieldset { border: 2px solid var(--fg); margin: 0 0 1rem; padding: .5rem .9rem; }
legend { font-weight: 600; padding: 0 .3rem; }
input[type=text], input[type=password], input[type=number], input[type=search], input[type=date], select, textarea {
  display: block;
  width: 100%;
  margin-top: .3rem;
  padding: .6rem .7rem;
  border: 2px solid var(--fg);
  border-radius: .3rem;
  background: var(--bg);
  color: var(--fg);
  font: inherit;
  font-weight: 400;
  min-height: 3rem;
}
textarea { resize: vertical; }
input[type=file] { display: block; margin-top: .3rem; font: inherit; font-weight: 400; max-width: 100%; }

.notice { border: 2px solid var(--fg); padding: .7rem .9rem; font-weight: 600; }

/* Lists */
ul.list { list-style: none; padding: 0; margin: .5rem 0; border-top: 2px solid var(--fg); }
ul.list li { border-bottom: 2px solid var(--fg); }
a.row { display: flex; gap: .75rem; align-items: center; padding: .8rem .2rem; text-decoration: none; min-height: 3.2rem; }
a.row:hover .grow { text-decoration: underline; }
.counts { white-space: nowrap; font-variant-numeric: tabular-nums; font-weight: 600; }
li.token { display: flex; gap: .75rem; align-items: center; padding: .8rem .2rem; }
li.token form { margin: 0; }
ul.prose li { margin-bottom: .5rem; }

form.search { display: flex; gap: .5rem; flex-wrap: wrap; }
form.search input { flex: 2 1 10rem; margin: 0; }
form.search select { flex: 1 1 7rem; width: auto; margin: 0; }

/* Studying */
.status { display: flex; justify-content: space-between; gap: 1rem; margin: .5rem 0; }
section.face { font-size: 1.35rem; padding: 1rem 0; overflow-wrap: anywhere; }
section.face img, img.thumb { display: block; max-width: 100%; height: auto; margin: 0 auto .75rem; filter: grayscale(1); }
img.thumb { max-height: 10rem; margin: 0 0 .5rem; }
hr.divider { border-top: 3px dashed var(--fg); margin: .5rem 0; }
.md p { margin: 0 0 .6em; }
.md p:last-child { margin-bottom: 0; }
.md table { border-collapse: collapse; }
.md td, .md th { border: 1px solid var(--fg); padding: .2rem .4rem; }
.md blockquote { border-left: 4px solid var(--fg); margin: 0; padding-left: .8rem; }

.answers {
  display: grid;
  gap: .6rem;
  position: sticky;
  bottom: 0;
  background: var(--bg);
  padding: .75rem 0;
  margin: 1rem 0 0;
  border-top: 2px solid var(--fg);
}
.answers.cols-2 { grid-template-columns: 1fr 1fr; }
.answers.cols-4 { grid-template-columns: repeat(4, 1fr); }
.answers .btn { flex-direction: column; gap: 0; min-height: 4rem; padding: .4rem; }
.answers .label { font-size: 1.1rem; }
.answers .ivl { font-size: .8rem; font-weight: 400; }
.study-tools { display: flex; justify-content: space-between; align-items: center; }
.study-tools form { margin: 0; }

/* Stats */
dl.stats-inline { display: grid; grid-template-columns: repeat(3, 1fr); gap: .5rem; margin: 1rem 0; }
dl.stats-inline div { border: 2px solid var(--fg); padding: .5rem; text-align: center; }
dl.stats-inline dt { font-size: .8rem; }
dl.stats-inline dd { margin: 0; font-size: 1.5rem; font-weight: 700; font-variant-numeric: tabular-nums; }
dl.kv { display: grid; grid-template-columns: auto 1fr; gap: .3rem 1rem; }
dl.kv dt { font-weight: 600; }
dl.kv dd { margin: 0; font-variant-numeric: tabular-nums; }
table { width: 100%; border-collapse: collapse; }
table.history th, table.history td { text-align: left; padding: .35rem .2rem; border-bottom: 1px solid var(--fg); font-size: .9rem; }
table.forecast th { text-align: left; font-weight: 400; white-space: nowrap; padding: .2rem .5rem .2rem 0; width: 4.5rem; }
table.forecast .bar-cell { width: 100%; }
table.forecast .bar { display: block; height: 1.1rem; background: var(--fg); min-width: 2px; }
table.forecast .num { text-align: right; padding-left: .5rem; font-variant-numeric: tabular-nums; }

@media (max-width: 360px) {
  html { font-size: calc(16px * var(--scale)); }
  form.answers.cols-4 { grid-template-columns: 1fr 1fr; }
}