/* Lexend ligger på egna sidan (SIL OFL 1.1, se fonts/OFL.txt). En variabel fil täcker vikterna 400–800. */
@font-face {
  font-family: 'Lexend';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url(fonts/lexend-latin.woff2) format('woff2');
}

:root {
  --paper: #F7F9FC;
  --surface: #FFFFFF;
  --grid: #E3EAF3;
  --grid-strong: #C9D5E4;
  --ink: #18213A;
  --muted: #56607A;
  --pen: #2443B5;
  --pen-soft: #E8EDFB;
  --right: #1F7A4D;
  --right-soft: #E3F3EA;
  --wrong: #B3261E;
  --wrong-soft: #FBE7E5;
  --c0: #2443B5; --c1: #13837A; --c2: #C98A12; --c3: #8A3B8F;
  --cell: 24px;
  font-family: 'Lexend', system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #111827; --surface: #172033; --grid: #1D2840; --grid-strong: #2C3A57;
    --ink: #E6ECF7; --muted: #A3AECA; --pen: #8FA8FF; --pen-soft: #1F2C52;
    --right: #5FD39A; --right-soft: #15352A; --wrong: #FF8A80; --wrong-soft: #3A1E22;
    --c0: #6F8CFF; --c1: #2FB3A6; --c2: #E0A93A; --c3: #C27BC7;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; color: var(--ink); background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: var(--cell) var(--cell);
  font-size: 1.0625rem; line-height: 1.5;
}
.wrap { width: 100%; max-width: 40rem; margin: 0 auto; padding: 0 16px; }
a { color: var(--pen); }
:focus-visible { outline: 3px solid var(--pen); outline-offset: 2px; border-radius: 4px; }
button { font: inherit; color: inherit; }

/* Startsidan */
.intro { padding: 48px 0 24px; }
.wordmark { margin: 0; font-size: clamp(2.5rem, 9vw, 3.5rem); font-weight: 800; letter-spacing: -0.02em; line-height: 1; }
.wordmark span { color: var(--pen); }
.lead { margin: 16px 0 0; max-width: 34ch; font-size: 1.1875rem; color: var(--muted); }

.parts { list-style: none; margin: 8px 0 0; padding: 0; background: var(--surface); border: 1px solid var(--grid-strong); border-radius: 8px; }
.parts li + li { border-top: 1px solid var(--grid-strong); }
.part {
  display: grid; grid-template-columns: 5.2rem 1fr auto; align-items: center; gap: 12px;
  padding: 16px; text-decoration: none; color: var(--ink); min-height: 72px;
}
.part:hover { background: var(--pen-soft); }
.code { font-size: 1.9rem; font-weight: 800; color: var(--pen); letter-spacing: 0.02em; line-height: 1; }
.code.mix { font-size: 1.15rem; letter-spacing: 0; }
.pname { font-weight: 700; display: block; }
.tally { display: block; color: var(--muted); font-size: 0.9375rem; font-variant-numeric: tabular-nums; }
.go { width: 34px; height: 34px; border: 2px solid var(--pen); border-radius: 50%; display: grid; place-items: center; color: var(--pen); font-weight: 800; }
.hint { margin: 16px 0 0; color: var(--muted); }
.hint a { font-weight: 700; }

/* Övningsläget */
.bar { display: flex; align-items: center; gap: 12px; padding: 16px 0; font-variant-numeric: tabular-nums; }
.back { font-weight: 700; text-decoration: none; padding: 6px 0; }
.back::before { content: '‹ '; }
.where { font-weight: 800; color: var(--pen); }
.score { margin-left: auto; color: var(--muted); }

.sheet { background: var(--surface); border: 1px solid var(--grid-strong); border-radius: 8px; padding: 20px 16px 24px; margin-bottom: 24px; }
.qhead { margin: 0 0 12px; color: var(--muted); font-size: 0.9375rem; }
.qtext:focus { outline: none; }
.qtext { margin: 0 0 16px; font-size: 1.1875rem; line-height: 1.55; max-width: 60ch; }

.quant { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 0 0 20px; }
.quant div { border: 1px solid var(--grid-strong); border-radius: 6px; padding: 12px; background: var(--paper); }
.quant span { display: block; color: var(--muted); font-size: 0.875rem; font-weight: 700; }
.quant p { margin: 4px 0 0; font-size: 1.125rem; font-weight: 700; }

.statements { list-style: none; margin: 0 0 16px; padding: 0; }
.statements li { display: grid; grid-template-columns: 2.4rem 1fr; padding: 6px 0; }
.statements b { color: var(--pen); }
.nog-lead { margin: 0 0 8px; color: var(--muted); }

.fig-wrap { margin: 0 0 20px; overflow-x: auto; }
.fig { display: block; width: 100%; max-width: 480px; height: auto; margin: 0 auto; font-family: inherit; }
.fig text { fill: var(--ink); font-size: 11px; }
.fig .fig-title { font-size: 13px; font-weight: 700; }
.fig .fig-tick { fill: var(--muted); font-size: 10px; }
.fig .fig-val { font-weight: 700; }
.fig-grid { stroke: var(--grid-strong); stroke-width: 1; }
.fig-bar { fill: var(--pen); }
.fig-line { fill: none; stroke: var(--pen); stroke-width: 2.5; stroke-linejoin: round; }
.fig-dot { fill: var(--surface); stroke: var(--pen); stroke-width: 2.5; }
.fig-c0 { fill: var(--c0); } .fig-c1 { fill: var(--c1); } .fig-c2 { fill: var(--c2); } .fig-c3 { fill: var(--c3); }
.fig path { stroke: var(--surface); stroke-width: 2; }
.fig .fig-pie-val { fill: #fff; font-size: 12px; font-weight: 800; paint-order: stroke; stroke: rgba(0, 0, 0, .45); stroke-width: 2.5px; }
.fig-table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.fig-table caption { text-align: left; font-weight: 700; padding-bottom: 8px; }
.fig-table th, .fig-table td { border: 1px solid var(--grid-strong); padding: 8px 10px; text-align: right; }
.fig-table th[scope="row"], .fig-table thead th:first-child { text-align: left; }
.fig-table thead th { background: var(--paper); }

.options { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--grid-strong); }
.options li { border-bottom: 1px solid var(--grid-strong); }
.opt {
  display: grid; grid-template-columns: 34px 1fr; align-items: center; gap: 14px; width: 100%;
  min-height: 56px; padding: 10px 8px; background: none; border: 0; text-align: left; cursor: pointer;
}
.opt:hover:not(:disabled) { background: var(--pen-soft); }
.opt:disabled { cursor: default; }
.bubble {
  width: 34px; height: 34px; border-radius: 50%; border: 2px solid var(--pen); color: var(--pen);
  display: grid; place-items: center; font-weight: 800; font-size: 0.9375rem;
  transition: background-color .18s ease, color .18s ease, transform .18s ease;
}
.picked .bubble { background: var(--ink); border-color: var(--ink); color: var(--surface); transform: scale(1.06); }
.is-right { background: var(--right-soft); }
.is-right .bubble { background: var(--right); border-color: var(--right); color: var(--surface); }
.is-wrong { background: var(--wrong-soft); }
.is-wrong .bubble { background: var(--wrong); border-color: var(--wrong); color: var(--surface); }
.dim { opacity: .55; }

.explain { margin-top: 20px; }
.verdict { margin: 0 0 8px; font-size: 1.25rem; }
.verdict.ok { color: var(--right); }
.verdict.no { color: var(--wrong); }
.steps { margin: 0 0 20px; padding-left: 1.4rem; max-width: 60ch; }
.steps li { padding: 3px 0; }
.next {
  width: 100%; min-height: 52px; border: 0; border-radius: 8px; background: var(--pen); color: var(--surface);
  font-weight: 800; font-size: 1.0625rem; cursor: pointer;
}
.next:hover { filter: brightness(1.08); }
.keys { margin: 12px 0 0; color: var(--muted); font-size: 0.875rem; text-align: center; }

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

.foot { padding-top: 8px; padding-bottom: 32px; color: var(--muted); font-size: 0.875rem; }

@media (max-width: 400px) {
  .part { grid-template-columns: 4.2rem 1fr auto; padding: 14px 12px; }
  .code { font-size: 1.55rem; }
  .quant { grid-template-columns: 1fr; }
  .keys { display: none; }
}
@media (prefers-reduced-motion: reduce) { .bubble { transition: none; } .picked .bubble { transform: none; } }