/* Think Before You Build. A spec sheet on drafting paper: navy ink for the text,
   non-photo blue for the guides, a red pencil for vague answers, a yellow marker for the fields you write. */
:root {
  color-scheme: light;
  --paper: #FFFFFF;
  --grid: #E3F1F7;
  --guide: #8FCBE0;
  --guide-ink: #3A8DB0;
  --ink: #1E2B4A;
  --ink-2: #51607F;
  --pencil: #CC2F3B;
  --marker: #FFEE94;
  --marker-soft: #FFFBE3;
  --sans: 'Archivo', 'Helvetica Neue', Arial, sans-serif;
  --hand: 'Kalam', 'Comic Sans MS', cursive;
  --measure: 72rem;
  --gutter: 16px;
}
@media (min-width: 720px) { :root { --gutter: 32px; } }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.55;
}
a { color: inherit; }
a:focus-visible, button:focus-visible, textarea:focus-visible, input:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 2px;
}
.wrap { max-width: var(--measure); margin-inline: auto; padding-inline: var(--gutter); }
.skip { position: absolute; left: -999px; }
.skip:focus { left: var(--gutter); top: 8px; background: var(--paper); padding: 4px 8px; z-index: 10; }

/* Header */
.site-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px 24px; padding-block: 20px; }
.wordmark { font-weight: 800; font-stretch: 125%; font-size: 1.05rem; letter-spacing: -0.01em; text-decoration: none; }
.site-nav { display: flex; flex-wrap: wrap; gap: 4px 20px; font-size: 0.95rem; font-weight: 550; }
.site-nav a { text-decoration: none; color: var(--ink-2); }
.site-nav a:hover, .site-nav a[aria-current] { color: var(--ink); text-decoration: underline 2px var(--guide); text-underline-offset: 6px; }

/* Type */
h1, h2, h3 { margin: 0; line-height: 1.05; letter-spacing: -0.02em; }
.display { font-size: clamp(2.6rem, 6.2vw, 5rem); font-weight: 850; font-stretch: 125%; line-height: 0.95; letter-spacing: -0.035em; }
.title { font-size: clamp(2.2rem, 5.5vw, 3.75rem); font-weight: 850; font-stretch: 125%; line-height: 0.95; letter-spacing: -0.03em; }
.h2 { font-size: clamp(1.6rem, 3.2vw, 2.25rem); font-weight: 800; font-stretch: 106%; }
.h3 { font-size: 1.25rem; font-weight: 750; font-stretch: 110%; letter-spacing: -0.01em; }
.lede { margin: 20px 0 0; max-width: 34rem; font-size: 1.25rem; line-height: 1.5; color: var(--ink-2); }
.muted { color: var(--ink-2); }
.small { font-size: 0.9rem; }
p { margin: 0; }
p + p { margin-top: 0.75em; }

/* The red pencil */
.pencil { font-family: var(--hand); color: var(--pencil); font-size: 1.1rem; line-height: 1.3; }
.struck { text-decoration: line-through 2px var(--pencil); text-decoration-skip-ink: none; }
.marker { background: linear-gradient(transparent 12%, var(--marker) 12%, var(--marker) 88%, transparent 88%); padding-inline: 0.2em; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border: 2px solid var(--ink); border-radius: 6px;
  background: var(--ink); color: var(--paper);
  font: inherit; font-weight: 650; font-size: 1rem; text-decoration: none; cursor: pointer;
}
.btn:hover { background: #2E3F68; border-color: #2E3F68; }
.btn.ghost { background: var(--paper); color: var(--ink); }
.btn.ghost:hover { background: var(--grid); }
.btn.quiet { border-color: transparent; background: transparent; color: var(--ink-2); padding-inline: 10px; }
.btn.quiet:hover { color: var(--ink); background: var(--grid); }
.btn[data-armed] { background: var(--pencil); border-color: var(--pencil); color: var(--paper); }

/* Hub: hero */
.hero { display: grid; gap: 40px; padding-block: 40px 72px; align-items: center; }
@media (min-width: 960px) { .hero { grid-template-columns: 1.05fr 1fr; gap: 56px; padding-block: 64px 96px; } }

/* A field from the canvas, as the hero exhibit */
.sheet { position: relative; background: var(--paper); border: 1.5px solid var(--guide); border-radius: 4px; padding: 24px 24px 28px; box-shadow: 8px 8px 0 var(--grid); }
.sheet-head { display: flex; align-items: baseline; gap: 12px; }
.num { font-weight: 850; font-stretch: 125%; font-size: 2rem; line-height: 1; color: var(--guide-ink); font-variant-numeric: tabular-nums; }
.tag { margin-left: auto; padding: 2px 8px; border-radius: 3px; font-size: 0.8rem; font-weight: 650; white-space: nowrap; }
.tag.you { background: var(--marker); }
.tag.agent { background: var(--grid); color: var(--ink-2); }
.tag.both { background: linear-gradient(90deg, var(--marker) 50%, var(--grid) 50%); }
.sheet-q { margin-top: 8px; color: var(--ink-2); }
.answer { margin-top: 18px; padding: 12px 14px; border-radius: 3px; font-size: 1.1rem; }
.answer.weak { background: var(--marker-soft); }
.answer.sharp { background: var(--marker-soft); border-left: 3px solid var(--ink); }
.note { display: block; margin-top: 6px; }
.verdict { display: block; margin-top: 8px; font-size: 0.85rem; font-weight: 700; }

/* The one page-load moment: the pencil strikes the vague answer, then the sharp one appears. */
@media (prefers-reduced-motion: no-preference) {
  .sheet .struck { text-decoration: none; background: linear-gradient(var(--pencil), var(--pencil)) left 55% / 0% 2px no-repeat; animation: strike 0.5s 0.6s ease-out forwards; }
  .sheet .note { opacity: 0; animation: appear 0.35s 1.15s ease-out forwards; }
  .sheet .answer.sharp { opacity: 0; transform: translateY(6px); animation: appear 0.45s 1.7s ease-out forwards; }
  @keyframes strike { to { background-size: 100% 2px; } }
  @keyframes appear { to { opacity: 1; transform: none; } }
}

/* Hub: ways to use it */
.section { padding-block: 56px; border-top: 1.5px solid var(--guide); }
.section-head { max-width: 46rem; margin-bottom: 32px; }
.section-head p { margin-top: 12px; color: var(--ink-2); }
.ways { display: grid; gap: 32px; }
@media (min-width: 880px) { .ways { grid-template-columns: 1.4fr 1fr 1fr; gap: 0; } .way + .way { border-left: 1.5px solid var(--guide); } .way { padding-inline: 28px; } .way:first-child { padding-left: 0; } }
.way p { margin-top: 10px; color: var(--ink-2); }
.way .btn { margin-top: 20px; }
.way.lead .h3 { font-size: 1.6rem; }
.fine { margin-top: 10px; font-size: 0.85rem; color: var(--ink-2); }

/* Mini grid on the hub, full grid on /patterns/ */
.grid2 { display: grid; grid-template-columns: auto 1fr 1fr; gap: 0; border: 1.5px solid var(--guide); border-radius: 4px; background: var(--paper); }
.grid2 > * { padding: 14px 16px; border-color: var(--guide); }
.axis { font-size: 0.85rem; font-weight: 650; color: var(--ink-2); }
.axis.col { border-bottom: 1.5px solid var(--guide); }
.axis.row { border-right: 1.5px solid var(--guide); display: flex; align-items: center; }
.axis.row span { writing-mode: vertical-rl; transform: rotate(180deg); white-space: nowrap; }
.cell { border-left: 1.5px solid var(--guide); }
.grid2 .cell:nth-of-type(odd) { border-left: 0; }
.cell.top { border-bottom: 1.5px solid var(--guide); }
.cell-name { font-weight: 750; font-stretch: 110%; font-size: 1.05rem; }
.cell-level { margin-top: 2px; font-size: 0.9rem; color: var(--ink-2); }
@media (max-width: 600px) { .grid2 > * { padding: 10px; } .cell-name { font-size: 0.95rem; } }

.meter { display: inline-flex; gap: 4px; vertical-align: middle; margin-right: 8px; }
.meter i { width: 9px; height: 9px; border-radius: 50%; border: 1.5px solid var(--ink); }
.meter i.on { background: var(--ink); }

/* Patterns page */
.questions { display: grid; gap: 24px; margin-block: 40px; }
@media (min-width: 760px) { .questions { grid-template-columns: 1fr 1fr; } }
.question { padding: 20px; background: var(--paper); border: 1.5px solid var(--guide); border-radius: 4px; }
.question dl { margin: 12px 0 0; display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; }
.question dt { font-weight: 700; }
.question dd { margin: 0; color: var(--ink-2); }
.patterns { grid-template-columns: auto 1fr 1fr; }
.patterns .cell { padding: 20px; }
.patterns .cell-name { font-size: 1.3rem; }
.patterns .flow { display: block; width: 100%; max-width: 280px; height: auto; margin: 14px 0 10px; color: var(--ink); }
.patterns dl { margin: 12px 0 0; display: grid; gap: 8px; }
.patterns dt { font-size: 0.8rem; font-weight: 700; color: var(--ink-2); }
.patterns dd { margin: 0; }
@media (max-width: 760px) {
  .patterns { grid-template-columns: 1fr; }
  .patterns .axis { display: none; }
  .patterns .cell { border-left: 0; border-bottom: 1.5px solid var(--guide); }
  .patterns .cell:last-child { border-bottom: 0; }
  .patterns .cell-pos { display: block; }
}
.cell-pos { display: none; margin-bottom: 6px; font-size: 0.8rem; font-weight: 650; color: var(--ink-2); }
.levels { margin: 16px 0 0; padding-left: 1.4em; }
.levels li + li { margin-top: 4px; }
.rules { margin: 16px 0 0; padding-left: 1.2em; max-width: 44rem; }
.rules li + li { margin-top: 8px; }

/* Canvas pages */
.canvas-head { padding-block: 40px 28px; }
.legend .tag { margin-left: 0; }
.legend { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 20px; font-size: 0.9rem; color: var(--ink-2); align-items: center; }
.fields { display: grid; gap: 20px; padding-bottom: 140px; }
@media (min-width: 900px) {
  .fields { grid-template-columns: 1fr 1fr; }
  .field.wide { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; column-gap: 20px; align-items: start; }
  .field.wide > :not(.part) { grid-column: 1 / -1; }
  .field.wide > .field-link { justify-self: start; }
}
.field { background: var(--paper); border: 1.5px solid var(--guide); border-radius: 4px; padding: 18px 18px 16px; }
.field.you { border-left: 6px solid var(--marker); }
.field.both { border-left: 6px solid var(--marker); }
.field-head { display: flex; align-items: baseline; gap: 12px; }
.field-head .num { font-size: 1.6rem; }
.field-q { margin-top: 6px; color: var(--ink-2); }
.part { margin-top: 14px; }
.part label { display: flex; justify-content: space-between; gap: 8px; font-size: 0.85rem; font-weight: 650; margin-bottom: 4px; }
.part label .tag { margin-left: 0; }
textarea, input[type="text"] {
  width: 100%; padding: 10px 12px; border: 1.5px solid var(--guide); border-radius: 3px;
  background: var(--paper); color: var(--ink); font: inherit; font-size: 1rem; line-height: 1.5; resize: vertical;
}
.field.you textarea, .field.you input, .part.you textarea { background: var(--marker-soft); }
textarea::placeholder, input::placeholder { color: #687390; }
textarea { min-height: 7.5rem; overflow: hidden; }
.test { margin-top: 12px; font-size: 0.92rem; }
.test b { font-weight: 700; }
.weakline { margin-top: 4px; font-size: 0.92rem; color: var(--ink-2); }
.weakline .pencil { font-size: 1.02rem; }
.field-link { display: inline-block; margin-top: 10px; font-weight: 650; text-decoration: underline 2px var(--guide); text-underline-offset: 5px; }
.stop { margin-top: 12px; padding: 10px 12px; background: var(--grid); border-radius: 3px; font-size: 0.92rem; }

.toolbar { position: fixed; inset: auto 0 0 0; z-index: 5; background: rgba(255,255,255,0.96); border-top: 1.5px solid var(--guide); }
.toolbar .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; padding-block: 12px; }
.progress { margin-right: auto; font-size: 0.95rem; font-weight: 650; }
.progress small { display: block; font-weight: 400; color: var(--ink-2); font-size: 0.8rem; }
@media (max-width: 600px) { .toolbar .btn { padding: 8px 12px; font-size: 0.9rem; } .progress { width: 100%; } }

/* Footer */
.site-foot { padding-block: 32px 48px; border-top: 1.5px solid var(--guide); font-size: 0.9rem; color: var(--ink-2); display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
.site-foot a { color: var(--ink); text-underline-offset: 4px; }
.canvas-page .site-foot { padding-bottom: 120px; }