/* =========================================================================
   Attend Reader UI Kit — component styles
   ========================================================================= */
@import url("../../colors_and_type.css");

/* ---- Root layout ---- */
.app {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
  background: var(--paper);
}

.reader {
  max-width: 860px;
  padding: 56px 48px 160px;
  position: relative;
}

/* =========================================================================
   SIDEBAR
   ========================================================================= */
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  background: var(--paper-2);
  border-right: 1px solid var(--paper-3);
  padding: 24px 20px;
  overflow-y: auto;
  font-size: 13px;
}
.sidebar .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: 22px;
  color: var(--ink);
  margin-bottom: 22px;
}
.sidebar__progress { margin-bottom: 20px; }
.sidebar__progress-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 6px;
}
.track { height: 3px; background: var(--paper-3); border-radius: 999px; position: relative; overflow: hidden; }
.track i { position: absolute; inset: 0; background: var(--ink); }

.toc { display: flex; flex-direction: column; gap: 4px; }
.toc__chap { padding: 6px 8px; border-radius: 4px; }
.toc__chap.is-active { background: var(--paper); }
.toc__head { display: flex; gap: 10px; font-weight: 600; color: var(--ink); line-height: 1.35; }
.toc__n    { font-family: var(--font-mono); font-size: 11px; color: var(--ink-4); min-width: 22px; }
.toc__chap.is-active .toc__n { color: var(--query); }
.toc__subs { list-style: none; padding: 6px 0 4px 32px; margin: 0; display: flex; flex-direction: column; gap: 2px; font-weight: 400; color: var(--ink-3); }
.toc__subs li { display: flex; gap: 8px; padding: 2px 0; }
.toc__subs li.is-now  { color: var(--ink); font-weight: 600; }
.toc__subs li.is-done { color: var(--ink-4); }
.toc__subs li.is-done .toc__n::before { content: "✓"; color: var(--ok); margin-right: 3px; }

.sidebar__foot {
  position: sticky;
  bottom: -24px;
  margin-top: 24px;
  padding: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-3);
  border-top: 1px solid var(--paper-3);
}
kbd {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 1px 5px;
  border: 1px solid var(--paper-edge);
  border-radius: 3px;
  background: var(--paper);
  color: var(--ink);
}

/* =========================================================================
   TOP BAR (sticky)
   ========================================================================= */
.topbar {
  position: sticky;
  top: 16px;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
  padding: 10px 16px;
  background: color-mix(in oklch, var(--paper) 85%, transparent);
  backdrop-filter: blur(12px);
  border: 1px solid var(--paper-3);
  border-radius: 10px;
  font-size: 13px;
}
.topbar__left  { display: flex; align-items: center; gap: 10px; color: var(--ink-3); }
.topbar__chap  { font-family: var(--font-display); font-style: italic; font-weight: 500; font-size: 15px; color: var(--ink); }
.topbar__sep   { color: var(--ink-4); }
.topbar__right { display: flex; align-items: center; gap: 12px; font-family: var(--font-mono); font-size: 11px; color: var(--ink-3); }
.topbar__track { width: 120px; height: 3px; background: var(--paper-3); border-radius: 999px; overflow: hidden; position: relative; }
.topbar__track i { position: absolute; inset: 0; background: var(--ink); }

/* =========================================================================
   PROSE
   ========================================================================= */
.reader h1.hero {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 52px;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 20px;
}
.reader .lede {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 20px;
  line-height: 1.55;
  color: var(--ink-2);
  margin: 0 0 48px;
  max-width: 60ch;
}
.reader h2 { margin: 56px 0 16px; }
.reader h3 { margin: 40px 0 12px; }
.reader p  { margin: 0 0 18px; max-width: 68ch; }

/* Symbol tokens in prose */
.reader em.math { font-family: var(--font-display); font-style: italic; font-weight: 500; color: var(--ink); }

/* Dropcap variant */
.has-dropcap::first-letter {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 3.6em;
  float: left;
  line-height: 0.9;
  padding: 4px 10px 0 0;
  color: var(--ink);
}

/* =========================================================================
   CALLOUT
   ========================================================================= */
.callout {
  border-left: 2px solid var(--ink);
  padding: 12px 18px;
  background: var(--paper-2);
  margin: 24px 0;
  border-radius: 0 6px 6px 0;
}
.callout--info { border-color: var(--key);   background: var(--key-soft);   color: var(--key-ink); }
.callout--warn { border-color: var(--warn);  background: var(--warn-soft);  color: var(--warn); }
.callout__title { font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 4px; }
.callout__body  { font-size: 14px; line-height: 1.55; }

/* =========================================================================
   FIGURE
   ========================================================================= */
.figure {
  margin: 36px -40px;
  background: var(--paper-2);
  border: 1px solid var(--paper-3);
  border-radius: 12px;
  overflow: hidden;
}
.figure__canvas {
  padding: 28px;
  background:
    radial-gradient(circle at 1px 1px, var(--paper-3) 1px, transparent 1px) 0 0 / 10px 10px,
    var(--paper);
}
.figure figcaption {
  display: flex;
  gap: 10px;
  padding: 10px 20px;
  border-top: 1px solid var(--paper-3);
  font-size: 13px;
  color: var(--ink-3);
}
.figure__n {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink);
  font-weight: 600;
}

/* =========================================================================
   SCRATCHPAD
   ========================================================================= */
.scratch {
  margin: 24px 0;
  background: #fff;
  border: 1px solid var(--paper-edge);
  border-radius: 10px;
  overflow: hidden;
}
.scratch__bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 14px;
  background: var(--paper-2);
  border-bottom: 1px solid var(--paper-3);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
}
.scratch__title { display: flex; align-items: center; gap: 8px; }
.scratch__dot   { width: 6px; height: 6px; border-radius: 999px; background: var(--query); }
.scratch__run   {
  background: var(--query); color: #fff; border: 0;
  font-family: var(--font-sans); font-size: 11px; font-weight: 600;
  padding: 4px 12px; border-radius: 4px; cursor: pointer;
}
.scratch__run:hover { background: #A83408; }
.scratch__run:disabled { background: var(--ink-4); cursor: wait; }
.scratch__code {
  margin: 0; padding: 14px 18px;
  background: var(--code-bg); color: var(--code-fg);
  font-family: var(--font-mono); font-size: 13px; line-height: 1.6;
  overflow-x: auto;
}
.scratch__code .kw { color: var(--code-keyword); }
.scratch__code .nm { color: var(--code-number); }
.scratch__code .st { color: var(--code-string); }
.scratch__code .cm { color: var(--code-comment); font-style: italic; }
.scratch__out {
  padding: 10px 18px;
  font-family: var(--font-mono); font-size: 12px;
  background: #fff; color: var(--ink);
  border-top: 1px solid var(--paper-3);
  display: flex; gap: 10px;
}
.scratch__arrow { color: var(--query); font-weight: 700; }

/* =========================================================================
   MATH BLOCK
   ========================================================================= */
.mathblock {
  margin: 28px 0;
  padding: 20px 24px;
  background: var(--paper-2);
  border-radius: 10px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
}
.mathblock__body {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 22px;
  color: var(--ink);
  flex: 1;
  text-align: center;
}
.mathblock__n {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

/* =========================================================================
   ATTENTION PLAYGROUND
   ========================================================================= */
.pg {
  margin: 48px -80px;
  background: var(--paper-2);
  border: 1px solid var(--paper-edge);
  border-radius: 14px;
  padding: 32px 36px;
}
.pg__head { display: flex; justify-content: space-between; align-items: flex-start; gap: 24px; margin-bottom: 24px; }
.pg__eyebrow {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--query);
  margin-bottom: 4px;
}
.pg__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 26px;
  line-height: 1.2;
  color: var(--ink);
  margin: 0 0 6px;
}
.pg__lede {
  font-size: 14px;
  color: var(--ink-3);
  line-height: 1.55;
  max-width: 60ch;
  margin: 0;
}
.pg__controls .ctl {
  font-family: var(--font-sans); font-weight: 500; font-size: 13px;
  padding: 8px 14px; border-radius: 6px;
  background: var(--ink); color: var(--paper); border: 0; cursor: pointer;
  transition: background 220ms;
}
.pg__controls .ctl:hover { background: var(--ink-2); }
.pg__controls .ctl.is-on { background: var(--query); }

/* Token bar */
.pg__tokens { display: flex; gap: 6px; margin-bottom: 20px; flex-wrap: wrap; }
.tok {
  display: inline-flex; align-items: baseline; gap: 6px;
  font-family: var(--font-display); font-style: italic; font-weight: 500;
  font-size: 16px;
  padding: 6px 12px;
  border-radius: 6px;
  background: var(--paper);
  border: 1px solid var(--paper-3);
  color: var(--ink-2);
  cursor: pointer;
  transition: all 180ms;
}
.tok:hover    { border-color: var(--paper-edge); background: #fff; }
.tok.is-active{ background: var(--ink); color: var(--paper); border-color: var(--ink); }
.tok__i { font-family: var(--font-mono); font-style: normal; font-size: 10px; color: var(--ink-4); }
.tok.is-active .tok__i { color: var(--ink-5); }

/* Steps */
.pg__step {
  opacity: 0.18;
  filter: grayscale(0.8);
  transition: opacity 360ms var(--ease-paper), filter 360ms var(--ease-paper);
  padding: 18px 0;
  border-top: 1px solid var(--paper-3);
}
.pg__step.is-on { opacity: 1; filter: none; }
.pg__step:first-of-type { border-top: 0; }
.pg__step-head {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.pg__step-n {
  width: 24px; height: 24px; border-radius: 999px;
  background: var(--ink); color: var(--paper);
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-weight: 600; font-size: 12px;
}
.pg__step-title { font-family: var(--font-sans); font-size: 15px; font-weight: 600; color: var(--ink); }
.pg__step-title em { font-style: italic; font-family: var(--font-display); font-weight: 600; }
.pg__step-shape { font-family: var(--font-mono); font-size: 11px; color: var(--ink-3); margin-left: auto; }

.pg__toggle { display: flex; gap: 6px; align-items: center; font-family: var(--font-mono); font-size: 11px; color: var(--ink-3); margin-left: auto; cursor: pointer; }
.pg__toggle input { accent-color: var(--query); }

.pg__slider { display: flex; align-items: center; gap: 8px; margin-left: auto; font-family: var(--font-mono); font-size: 11px; color: var(--ink-3); }
.pg__slider input { width: 140px; accent-color: var(--query); }
.pg__slider-val { min-width: 40px; text-align: right; color: var(--ink); font-weight: 600; }

/* Matrices */
.pg__matrices { display: flex; align-items: center; gap: 14px; overflow-x: auto; padding: 4px 0; }
.pg__matrices--one { justify-content: flex-start; }
.pg__op { font-family: var(--font-display); font-size: 22px; color: var(--ink-3); }

.matrix { display: flex; flex-direction: column; gap: 6px; }
.matrix__label {
  font-family: var(--font-display); font-style: italic; font-weight: 600;
  font-size: 14px; color: var(--ink); text-align: center;
}
.matrix--q .matrix__label { color: var(--query); }
.matrix--k .matrix__label { color: var(--key); }
.matrix--v .matrix__label { color: var(--value); }
.matrix__grid {
  display: grid; gap: 2px;
  background: var(--paper-3); padding: 2px; border-radius: 3px;
}
.matrix.is-dim .matrix__grid { opacity: 0.5; }
.cell {
  background: #fff;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 10px;
  width: 40px; height: 24px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 1px;
  transition: background 220ms, color 220ms;
  font-variant-numeric: tabular-nums;
}
.cell.is-hl { outline: 1px solid var(--ink); outline-offset: -1px; z-index: 1; }

.pg__note {
  margin-top: 10px;
  padding: 10px 14px;
  background: var(--warn-soft);
  color: var(--warn);
  font-size: 13px;
  border-radius: 6px;
}

/* Heat legend */
.pg__heatlegend {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 11px; color: var(--ink-3);
  margin-top: 10px;
}
.pg__heatbar { display: flex; height: 10px; border-radius: 3px; overflow: hidden; width: 160px; }
.pg__heatbar i { flex: 1; }

/* Flow visualisation */
.pg__flow {
  margin-top: 28px; padding: 20px;
  background: var(--paper);
  border: 1px solid var(--paper-3);
  border-radius: 10px;
}
.pg__flow-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 14px; }
.pg__flow-head .eyebrow { color: var(--ink); }
.pg__flow-hint { font-family: var(--font-mono); font-size: 10px; color: var(--ink-4); }
.pg__flow-stage { display: grid; grid-template-columns: 1fr 220px 1fr; gap: 8px; align-items: stretch; }
.pg__flow-col { display: flex; flex-direction: column; gap: 8px; }
.flow-node {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 12px;
  border-radius: 6px;
  background: var(--paper-2);
  border: 1px solid var(--paper-3);
  font-family: var(--font-display); font-style: italic; font-weight: 500;
  font-size: 14px; color: var(--ink);
  height: 28px; box-sizing: border-box;
  transition: all 220ms;
}
.flow-node--q.is-active { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.flow-node--q.is-dim    { opacity: 0.5; }
.flow-node--kv          { justify-content: space-between; }
.flow-node__i           { font-family: var(--font-mono); font-style: normal; font-size: 10px; color: var(--ink-4); min-width: 14px; }
.flow-node--q.is-active .flow-node__i { color: var(--ink-5); }
.flow-node__w           { font-family: var(--font-mono); font-style: normal; font-size: 11px; color: var(--ink); font-weight: 600; }

.pg__flow-svg { width: 100%; height: 100%; }

/* Stats strip */
.pg__stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 12px; margin-top: 20px;
}
.stat {
  padding: 12px 14px;
  background: var(--paper);
  border: 1px solid var(--paper-3);
  border-radius: 8px;
}
.stat__label { font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-3); display: block; margin-bottom: 4px; }
.stat__v     { font-family: var(--font-mono); font-size: 18px; color: var(--ink); font-variant-numeric: tabular-nums; }

@media (max-width: 1100px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; }
  .pg { margin-left: 0; margin-right: 0; }
  .figure { margin-left: 0; margin-right: 0; }
}