/* Pro Learn Network
   Static site stylesheet. No external requests: fonts are self-hosted (SIL OFL). */

@font-face {
  font-family: "Newsreader";
  src: url("../fonts/newsreader.woff2") format("woff2");
  font-weight: 200 800;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Instrument Sans";
  src: url("../fonts/instrument-sans.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --paper: #F3F5F4;
  --surface: #FFFFFF;
  --ink: #14232E;
  --ink-2: #46555F;
  --petrol: #1F5C66;
  --petrol-deep: #174A52;
  --lagoon: #7FBFC2;
  --line: #D3DCDB;
  --wine: #7B1E3C;
  --rose: #E04A75;

  --serif: "Newsreader", "Iowan Old Style", Georgia, serif;
  --sans: "Instrument Sans", "Helvetica Neue", Arial, sans-serif;

  --step--1: 0.875rem;
  --step-0: 1.0625rem;
  --step-1: 1.25rem;
  --step-2: 1.6rem;
  --step-3: clamp(1.9rem, 1.4rem + 1.6vw, 2.5rem);
  --step-4: clamp(2.4rem, 1.6rem + 3vw, 3.9rem);

  --wrap: 1180px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --section: clamp(4rem, 9vw, 7.5rem);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--step-0);
  line-height: 1.6;
  font-feature-settings: "kern", "liga";
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; display: block; }

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0;
  font-variation-settings: "opsz" 60;
}
h1 { font-size: var(--step-4); font-weight: 380; letter-spacing: -0.02em; }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-1); font-weight: 500; line-height: 1.3; font-variation-settings: "opsz" 24; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--petrol); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--ink); }
:focus-visible { outline: 2px solid var(--petrol); outline-offset: 3px; border-radius: 2px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.measure { max-width: 64ch; }
.lead { font-size: var(--step-1); line-height: 1.55; color: var(--ink-2); }
.muted { color: var(--ink-2); }
.small { font-size: var(--step--1); }

.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: #fff; padding: .6rem 1rem; z-index: 10; }
.skip:focus { left: 1rem; top: 1rem; }

/* ---------- Header ---------- */
.site-header { border-bottom: 1px solid var(--line); background: var(--paper); }
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem 2rem; padding-top: 1rem; padding-bottom: 1rem; flex-wrap: wrap;
}
.brand { display: inline-flex; line-height: 0; }
.brand img { height: 56px; width: auto; }
.nav { display: flex; align-items: center; gap: .25rem 1.6rem; flex-wrap: wrap; }
.nav a {
  color: var(--ink); text-decoration: none; font-size: 0.97rem; padding: .35rem 0;
  border-bottom: 1px solid transparent;
}
.nav a:hover { border-bottom-color: var(--ink); }
.nav a[aria-current="page"] { border-bottom-color: var(--petrol); color: var(--petrol); }
.nav .nav-contact {
  border: 1px solid var(--petrol); color: var(--petrol); border-radius: 2px; padding: .35rem .85rem;
}
.nav .nav-contact:hover { background: var(--petrol); color: #fff; }

/* ---------- Buttons ---------- */
.actions { display: flex; flex-wrap: wrap; gap: .75rem 1rem; margin-top: 2rem; }
.btn {
  display: inline-block; font: 500 1rem/1 var(--sans); text-decoration: none;
  padding: .95rem 1.4rem; border-radius: 2px; border: 1px solid var(--petrol);
}
.btn-primary { background: var(--petrol); color: #fff; }
.btn-primary:hover { background: var(--petrol-deep); color: #fff; }
.btn-quiet { color: var(--petrol); background: transparent; }
.btn-quiet:hover { background: var(--surface); color: var(--ink); }
.band-ink .btn-primary { background: var(--lagoon); border-color: var(--lagoon); color: var(--ink); }
.band-ink .btn-primary:hover { background: #fff; border-color: #fff; color: var(--ink); }
.band-ink .btn-quiet { color: #fff; border-color: rgba(255,255,255,.5); }
.band-ink .btn-quiet:hover { background: rgba(255,255,255,.08); color: #fff; }

/* ---------- Hero ---------- */
.hero { padding: clamp(3rem, 7vw, 6rem) 0 clamp(3rem, 6vw, 5rem); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 2rem 3rem; align-items: center; }
.hero h1 { max-width: 15ch; }
.hero .lead { margin-top: 1.6rem; max-width: 52ch; }
.hero-figure { margin: 0; }
.hero-figure svg { width: 100%; height: auto; overflow: visible; }
.hero-figure figcaption { font-size: var(--step--1); color: var(--ink-2); margin-top: .5rem; max-width: 46ch; }

.page-hero { padding: clamp(3rem, 7vw, 5.5rem) 0 clamp(2rem, 5vw, 3.5rem); }
.page-hero h1 { max-width: 18ch; }
.page-hero .lead { margin-top: 1.4rem; max-width: 60ch; }

/* Hero drawing: the single orchestrated motion on the site */
.loop-path { stroke-dasharray: 1; stroke-dashoffset: 0; }
.node, .node-label, .chord { opacity: 1; }
@media (prefers-reduced-motion: no-preference) {
  .js .loop-path { stroke-dashoffset: 1; animation: draw 2.2s cubic-bezier(.6,.05,.25,1) .2s forwards; }
  .js .node, .js .node-label, .js .chord { opacity: 0; animation: appear .6s ease-out forwards; animation-delay: var(--d, 1s); }
}
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes appear { to { opacity: 1; } }

/* ---------- Sections ---------- */
.section { padding: var(--section) 0; }
.section + .section { padding-top: 0; }
.band-surface { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.band-surface + .section, .section.band-surface, .section.band-ink { padding-top: var(--section); }
.section-head { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 1.2rem 3rem; margin-bottom: clamp(2rem, 5vw, 3.5rem); align-items: start; }
.section-head p { color: var(--ink-2); max-width: 58ch; margin-top: .35rem; }

/* Constraints grid */
.constraints { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2.5rem 3rem; }
.constraints article { border-top: 1px solid var(--ink); padding-top: 1.1rem; }
.constraints h3 { margin-bottom: .55rem; }
.constraints p { color: var(--ink-2); max-width: 52ch; }

/* Fields of practice */
.fields { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border-left: 1px solid var(--line); }
.field { padding: 0 clamp(1rem, 2.5vw, 2rem) .5rem; border-right: 1px solid var(--line); }
.field h3 { font-size: var(--step-2); font-weight: 400; margin-bottom: .4rem; }
.field .field-q { color: var(--ink-2); margin-bottom: 1.2rem; }
.field ul { list-style: none; margin: 0; padding: 0; }
.field li { padding: .7rem 0; border-top: 1px solid var(--line); font-size: .98rem; }

/* Formats: definition rows */
.rows { margin: 0; border-top: 1px solid var(--line); }
.row { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: .5rem 3rem; padding: 1.6rem 0; border-bottom: 1px solid var(--line); }
.row dt { font-family: var(--serif); font-size: var(--step-2); line-height: 1.2; font-variation-settings: "opsz" 36; }
.row dd { margin: 0; color: var(--ink-2); max-width: 60ch; }
.row dd a { white-space: nowrap; }

/* Principles */
.principles { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2.75rem 4rem; }
.principle h3 { font-size: var(--step-2); font-weight: 400; margin-bottom: .6rem; }
.principle p { color: var(--ink-2); max-width: 48ch; }
.principle::before { content: ""; display: block; width: 9px; height: 9px; border-radius: 50%; background: var(--petrol); margin-bottom: 1rem; }

/* Timeline */
.timeline { list-style: none; margin: 0; padding: 0; position: relative; }
.timeline li { display: grid; grid-template-columns: 7rem minmax(0, 1fr); gap: .25rem 2rem; padding: 0 0 2rem; position: relative; }
.timeline li::before { content: ""; position: absolute; left: calc(7rem + 1rem - 4px); top: .55rem; width: 9px; height: 9px; border-radius: 50%; background: var(--paper); border: 1.5px solid var(--petrol); }
.timeline li::after { content: ""; position: absolute; left: calc(7rem + 1rem); top: 1.3rem; bottom: .2rem; width: 1px; background: var(--line); }
.timeline li:last-child::after { display: none; }
.timeline li:last-child::before { background: var(--wine); border-color: var(--wine); }
.timeline .year { font-family: var(--serif); font-size: var(--step-1); color: var(--petrol); font-variant-numeric: lining-nums; }
.timeline .ev { padding-left: 1.6rem; max-width: 62ch; }
.timeline .ev strong { font-weight: 600; }
.timeline .ev p { color: var(--ink-2); margin-top: .2rem; }

/* People */
.people { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 2.5rem 4rem; }
.convener h3 { font-size: var(--step-2); font-weight: 400; margin-bottom: .2rem; }
.convener .role { color: var(--petrol); margin-bottom: 1rem; }
.convener ul { margin: 1rem 0 0; padding: 0; list-style: none; }
.convener li { padding: .55rem 0; border-top: 1px solid var(--line); font-size: .97rem; }
.names { columns: 3 11rem; column-gap: 2rem; list-style: none; margin: 1.2rem 0 0; padding: 0; }
.names li { break-inside: avoid; padding: .3rem 0; }
.note { font-size: var(--step--1); color: var(--ink-2); margin-top: 1.4rem; max-width: 60ch; }

/* Ink band (call to action) */
.band-ink { background: var(--ink); color: #E6ECEC; }
.band-ink h2 { color: #fff; max-width: 20ch; }
.band-ink p { color: #C3CFD0; max-width: 58ch; }
.band-ink a:not(.btn) { color: var(--lagoon); }
.cta .wrap { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 2rem 4rem; align-items: end; }
.cta .actions { margin-top: 0; flex-direction: column; align-items: stretch; max-width: 22rem; }
.cta .actions .btn { text-align: center; }

/* ---------- Masterclasses ---------- */
.steps { list-style: none; margin: 0; padding: 0; counter-reset: step; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 2rem; }
.steps li { counter-increment: step; border-top: 1px solid var(--ink); padding-top: 1rem; }
.steps li::before { content: counter(step); display: block; font-family: var(--serif); font-size: 2.6rem; line-height: 1; color: var(--petrol); margin-bottom: .9rem; font-variation-settings: "opsz" 72; font-weight: 300; }
.steps h3 { margin-bottom: .45rem; }
.steps p { color: var(--ink-2); font-size: .98rem; }

.settings { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem 3rem; }
.settings h3 { margin-bottom: .4rem; }
.settings p { color: var(--ink-2); }

.topics { border-top: 1px solid var(--ink); }
.topic { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 5fr) minmax(0, 2fr); gap: .6rem 2.5rem; padding: 1.5rem 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.topic h3 { font-size: var(--step-1); font-weight: 450; }
.topic p { color: var(--ink-2); margin: 0; }
.topic .basis { font-size: var(--step--1); color: var(--ink-2); }
.topic .basis.new { color: var(--wine); }
.topics-legend { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; font-size: var(--step--1); color: var(--ink-2); margin-top: 1rem; }

.reference { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 2rem 4rem; }
.modules { list-style: none; margin: 0; padding: 0; counter-reset: mod; }
.modules li { counter-increment: mod; display: grid; grid-template-columns: 2.4rem minmax(0, 1fr); padding: 1.1rem 0; border-top: 1px solid var(--line); }
.modules li::before { content: counter(mod); font-family: var(--serif); font-size: var(--step-1); color: var(--petrol); }
.modules h3 { font-size: 1.12rem; }
.modules p { color: var(--ink-2); margin: .25rem 0 0; font-size: .97rem; }
.modules .fac { font-size: var(--step--1); color: var(--petrol); margin-top: .35rem; }

.archive { columns: 2 18rem; column-gap: 3rem; list-style: none; padding: 0; margin: 0; }
.archive li { break-inside: avoid; padding: .7rem 0; border-top: 1px solid var(--line); }
.archive .y { font-family: var(--serif); color: var(--petrol); margin-right: .6rem; font-variant-numeric: lining-nums tabular-nums; }

/* ---------- Initiatives ---------- */
.initiative { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 1.5rem 4rem; }
.initiative + .initiative { margin-top: var(--section); padding-top: var(--section); border-top: 1px solid var(--line); }
.initiative aside { position: sticky; top: 2rem; align-self: start; }
.initiative aside h2 { margin-bottom: 1rem; }
.status { display: inline-block; font-size: var(--step--1); color: var(--petrol); border: 1px solid var(--petrol); border-radius: 999px; padding: .15rem .7rem; margin-bottom: 1rem; }
.status.past { color: var(--ink-2); border-color: var(--line); }
.initiative h3 { margin: 2rem 0 .6rem; }
.initiative h3:first-child { margin-top: 0; }
.initiative ul { padding-left: 1.1rem; margin: 0 0 1rem; }
.initiative li { margin: .35rem 0; }
.initiative li::marker { color: var(--petrol); }
.pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.5rem 2.5rem; margin-top: 2rem; }
.pair > div { border-top: 1px solid var(--ink); padding-top: 1rem; }
.pair h4 { font-family: var(--serif); font-weight: 450; font-size: var(--step-1); margin: 0 0 .5rem; }
.pair p { color: var(--ink-2); }
.quote { font-family: var(--serif); font-size: var(--step-1); line-height: 1.45; border-left: 2px solid var(--petrol); padding: .2rem 0 .2rem 1.2rem; margin: 1.5rem 0; max-width: 56ch; font-variation-settings: "opsz" 24; }

/* ---------- Legal pages ---------- */
.legal { padding: clamp(3rem, 7vw, 5rem) 0 var(--section); }
.legal .wrap { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); gap: 2rem 4rem; }
.legal h1 { font-size: var(--step-3); }
.legal h2 { font-size: var(--step-2); margin: 2.6rem 0 .8rem; }
.legal h2:first-child { margin-top: 0; }
.legal h3 { font-family: var(--sans); font-size: 1rem; font-weight: 600; margin: 1.6rem 0 .4rem; }
.legal .body { max-width: 70ch; }
.legal address { font-style: normal; line-height: 1.7; margin-bottom: 1em; }
.legal ul { padding-left: 1.1rem; }
.legal li { margin: .3rem 0; }
.legal .toc { position: sticky; top: 1.5rem; align-self: start; font-size: var(--step--1); }
.legal .toc ul { list-style: none; padding: 0; margin: 1rem 0 0; }
.legal .toc a { color: var(--ink-2); text-decoration: none; display: block; padding: .3rem 0; border-top: 1px solid var(--line); }
.legal .toc a:hover { color: var(--ink); }
.placeholder { background: #FFF4D6; border: 1px dashed #B38600; padding: 0 .3em; border-radius: 2px; }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: #C3CFD0; padding: 3rem 0 2.5rem; font-size: .95rem; }
.band-ink + .site-footer { border-top: 1px solid rgba(255,255,255,.12); }
.site-footer .wrap { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 4fr) minmax(0, 3fr); gap: 2rem 3rem; }
.site-footer img { height: 46px; width: auto; margin-bottom: 1.2rem; }
.site-footer a { color: #E6ECEC; text-decoration: none; }
.site-footer a:hover { color: var(--lagoon); text-decoration: underline; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { padding: .2rem 0; }
.site-footer address { font-style: normal; line-height: 1.65; }
.site-footer .endorse { color: #E6ECEC; }
.site-footer .fine { grid-column: 1 / -1; border-top: 1px solid rgba(255,255,255,.12); padding-top: 1.4rem; margin-top: 1rem; font-size: var(--step--1); color: #9AAAAD; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .hero-figure { max-width: 560px; }
  .section-head, .people, .cta .wrap, .reference, .initiative, .legal .wrap { grid-template-columns: 1fr; }
  .fields { grid-template-columns: 1fr; border-left: 0; }
  .field { border-right: 0; padding: 0 0 2rem; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .settings { grid-template-columns: 1fr; }
  .topic { grid-template-columns: 1fr; }
  .site-footer .wrap { grid-template-columns: 1fr 1fr; }
  .legal .toc, .initiative aside { position: static; }
}
@media (max-width: 640px) {
  body { font-size: 1rem; }
  .brand img { height: 40px; }
  .site-header .wrap { padding-top: .8rem; padding-bottom: .8rem; }
  .nav { gap: .2rem 1.1rem; width: 100%; }
  .nav { gap: .2rem 1rem; }
  .nav a { font-size: .93rem; }
  .nav .nav-contact { border: 0; padding: .35rem 0; border-bottom: 1px solid transparent; border-radius: 0; }
  .nav .nav-contact:hover { background: none; color: var(--ink); border-bottom-color: var(--ink); }
  .constraints, .principles, .steps, .pair { grid-template-columns: 1fr; }
  .row { grid-template-columns: 1fr; padding: 1.3rem 0; }
  .timeline li { grid-template-columns: 1fr; padding-left: 1.6rem; }
  .timeline li::before { left: 0; }
  .timeline li::after { left: 4px; }
  .timeline .ev { padding-left: 0; }
  .site-footer .wrap { grid-template-columns: 1fr; }
  .btn { width: 100%; text-align: center; }
}

@media print {
  .site-header .nav, .band-ink .actions { display: none; }
  body { background: #fff; }
}

/* Hero diagram on small screens: larger labels, bleed to the edges */
@media (max-width: 640px) {
  .hero-figure { margin: 0 calc(var(--gutter) * -0.5); }
  .hero-figure .node-label { font-size: 21px; }
}