/* Readability pass: larger type, diagrams sized to fit the page/slide. Loaded last so it overrides style.css. */
body { font-size: 18px; line-height: 1.7; }
h1 { font-size: 2.1rem; } h2 { font-size: 1.55rem; } h3 { font-size: 1.25rem; }
.nav a { font-size: 1rem; } .seg button, .chip { font-size: .95rem; }
.wrap { max-width: 1180px; }
.muted, .note, .crumbs { font-size: .95rem; }
.tag { font-size: .85rem; padding: 3px 10px; }
table.t { font-size: 1.02rem; } table.t th, table.t td { padding: 10px 12px; }
.card { padding: 22px; }
.q .stem { font-size: 1.05rem; } .part { padding: 12px 0; }
.sol { font-size: 1.02rem; line-height: 1.7; } .sol li { margin: 4px 0; }
.btn { font-size: 1rem; padding: 9px 16px; } .btn.sm { font-size: .92rem; padding: 6px 12px; }
input[type=text], input[type=number], select { font-size: 1rem; padding: 8px 10px; }
.field { grid-template-columns: 1fr 130px 70px; } .field span.u { font-size: .95rem; }
.out { font-size: 1.05rem; padding: 8px 0; }

/* formulas */
.formula { padding: 14px 20px; } .formula .lbl { font-size: .92rem; }
.formula .katex { font-size: 1.25em; }

/* diagrams: fit the available width AND the viewport height, text stays legible */
.diagram { padding: 12px; margin: 14px auto; max-width: 100%; }
.diagram svg { display: block; margin: 0 auto; width: 100%; max-width: 620px; height: auto; max-height: 56vh; }
.diagram figcaption { font-size: .95rem; margin-top: 6px; }
svg text { font-size: 14px; font-weight: 600; }
svg text.s { font-size: 12.5px; font-weight: 500; }
svg .proc { stroke-width: 3; } svg .dome { stroke-width: 2.2; }

/* slides */
.deck .bar2 { font-size: 1rem; padding: 10px 18px; }
.slide { font-size: clamp(19px, 2.1vw, 28px); padding: 40px 56px 64px; line-height: 1.5; }
.slide h2 { font-size: 1.8em; }
.slide li { margin: .45em 0; }
.slide .foot { font-size: max(13px, .5em); left: 56px; right: 56px; }
.slide .q { font-size: .78em; padding: 14px 18px; }
.slide .q .sol, .slide .q .part { font-size: 1em; }
.slide .formula { font-size: 1em; } .slide .formula .katex { font-size: 1.3em; }
/* diagrams in slides: sit side by side when several, each sized to leave room for the title */
.slide .diagram { display: inline-block; vertical-align: top; width: calc(50% - 10px); margin: 6px 4px; padding: 6px; }
.slide .diagram:only-of-type, .slide h2 + .diagram:last-child { display: block; width: auto; max-width: 760px; }
.slide .diagram svg { max-height: 42vh; max-width: 100%; }
.slide .diagram figcaption { font-size: .55em; }
@media (max-width: 860px) { .slide { padding: 28px 22px 56px; } .slide .diagram { display: block; width: auto; } .diagram svg { max-height: 50vh; } }
@media print { .diagram svg { max-height: 9cm; } .slide .diagram { width: 48%; } }

/* header fits one row on laptops; slides never clip at the top */
.top .wrap { max-width: 1500px; gap: 10px; }
.nav { margin-left: 4px; } .nav a { padding: 6px 9px; font-size: .95rem; }
.brand { font-size: 1.05rem; } .brand small { font-size: .72rem; }
.deck .stage { align-items: flex-start; }
.slide { margin: auto; padding: 30px 56px 60px; min-height: 0; }
.slide h2 { margin-bottom: .45em; }
.slide .diagram:only-of-type, .slide h2 + .diagram:last-child { display: block; width: auto; max-width: 760px; margin: 6px auto; }
.slide .diagram { margin: 6px 4px; }
.slide .diagram svg { max-height: 40vh; }
.slide .formula { margin: 8px 0; padding: 10px 16px; }

/* phones (must come last to win the cascade) */
@media (max-width: 860px) {
  .slide { padding: 22px 18px 52px; font-size: 17px; }
  .slide .diagram { display: block; width: auto; margin: 8px 0; }
  .slide .diagram svg { max-height: 44vh; }
  .slide .foot { left: 18px; right: 18px; font-size: 12px; }
  .deck .stage { padding: 8px; }
  .deck .bar2 { flex-wrap: wrap; gap: 6px; padding: 8px 10px; }
  .deck .bar2 b, .deck .bar2 .muted { display: none; }
  .top .wrap { padding: 6px 12px; }
  .wrap { padding: 0 12px; } main { padding-top: 16px; }
  h1 { font-size: 1.6rem; }
  .slide.about { padding: 22px 18px 52px; }
}
.slide .foot .prep { text-align: center; } .slide .foot .prep b { color: var(--navy); } :root[data-theme="dark"] .slide .foot .prep b { color: var(--ink); }
@media (max-width: 860px) { .slide .foot { flex-wrap: wrap; gap: 2px 12px; } .slide .foot .prep { order: 3; width: 100%; text-align: left; } }
.slide .foot .prep b, #prep b, .paper b.prep { text-transform: uppercase; }

/* branded header: black bar with gold rule, POLYCC logo, gold "Prepared by" pill */
.top, .deck .bar2 { background: #0A0708; border-bottom: 3px solid #C9962E; }
.brand { flex-direction: row; align-items: center; gap: 12px; }
.brand .logo { background: #fff; border-radius: 8px; padding: 4px 8px; display: flex; align-items: center; height: 48px; flex: none; }
.brand .logo img { height: 38px; width: auto; display: block; }
.brand .bt { display: flex; flex-direction: column; line-height: 1.25; }
.brand .bt b { font-size: 1.1rem; color: #fff; }
.brand .bt small { font-size: .85rem; opacity: 1; color: #F4E6E9; display: flex; align-items: center; gap: 8px; margin-top: 2px; }
.brand .gold { background: linear-gradient(180deg, #F4D97C, #C9962E); color: #3A2A00; font-weight: 800; letter-spacing: .02em; text-transform: uppercase; font-size: .78rem; padding: 3px 14px; border-radius: 999px; box-shadow: inset 0 0 0 1px rgba(255,255,255,.35); }
.top .wrap { min-height: 66px; }
@media (max-width: 860px) { .brand .logo { height: 40px; } .brand .logo img { height: 30px; } .brand .bt b { font-size: .95rem; } }
.brand .logo { padding: 0; overflow: hidden; background: #fff; } .brand .logo img { height: 48px; }
@media (max-width: 860px) { .brand .logo img { height: 40px; } }
.deck .bar2 .brand .logo { height: 44px; } .deck .bar2 .brand .logo img { height: 44px; }
@media (max-width: 860px) { .deck .bar2 .brand { display: none; } }

/* bigger header */
.top .wrap { min-height: 84px; gap: 14px 18px; padding-top: 6px; padding-bottom: 6px; }
.brand .logo { height: 68px; border-radius: 10px; } .brand .logo img { height: 68px; }
.brand .bt b { font-size: 1.45rem; line-height: 1.2; }
.brand .bt small { font-size: 1.02rem; gap: 10px; margin-top: 4px; }
.brand .gold { font-size: .95rem; padding: 4px 18px; }
.nav a { font-size: 1.15rem; padding: 9px 14px; }
.seg button { font-size: 1.05rem; padding: 8px 14px; } .chip { font-size: 1.05rem; padding: 8px 14px; }
.deck .bar2 { padding: 10px 20px; } .deck .bar2 .brand .logo, .deck .bar2 .brand .logo img { height: 56px; }
.deck .bar2 .brand .bt b { font-size: 1.25rem; }
@media (max-width: 1500px) { .top .wrap { row-gap: 4px; } .nav { order: 3; width: 100%; margin: 0 0 4px; } .tools { margin-left: auto; } .top .wrap { min-height: 0; } }
@media (max-width: 860px) { .brand .logo, .brand .logo img { height: 50px; } .brand .bt b { font-size: 1.05rem; } .brand .bt small { font-size: .85rem; } .nav a { font-size: 1rem; padding: 7px 10px; } }
.top .wrap { max-width: none; padding-left: 24px; padding-right: 24px; }