/* ==========================================================================
   BITS: Brunswick for Intentional Technology in Schools
   Paper, ink, and a lot of quiet space.
   ========================================================================== */

:root {
  --paper: #f9f5e9;
  --paper-deep: #f1ebdb;
  --ink: #1e1d1a;
  --ink-soft: #57534a;
  --ink-faint: #8a8578;
  --line: #d8d1bf;
  --accent: #a8432f; /* vermilion, like a hanko seal; used sparingly */

  --font-sans: "Jost", "Futura", "Avenir Next", system-ui, sans-serif;
  --font-serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;

  --measure: 38rem;
  --max: 68rem;
  --gutter: 16px;
  --space: clamp(4rem, 10vw, 7.5rem);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

[hidden] {
  display: none !important;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: text-decoration-color 0.2s ease, color 0.2s ease;
}

a:hover {
  text-decoration-color: var(--accent);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

h1,
h2,
h3 {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.25;
  margin: 0 0 0.6em;
}

h1 {
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  font-weight: 300;
  letter-spacing: 0.01em;
}

h3 {
  font-size: 1.25rem;
  font-weight: 500;
}

p {
  margin: 0 0 1.1em;
}

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0.5rem;
  z-index: 10;
  padding: 0.5rem 1rem;
  background: var(--ink);
  color: var(--paper);
}

.skip-link:focus {
  left: 0.5rem;
}

.draft-note {
  margin: 0;
  padding: 0.4rem var(--gutter);
  font: 400 0.8rem/1.5 var(--font-sans);
  letter-spacing: 0.08em;
  text-align: center;
  color: var(--ink-soft);
  background: var(--paper-deep);
}

/* ---------- header ---------- */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.5rem var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}

.brand__mark {
  width: 44px;
  height: 44px;
}

.brand__name {
  font: 400 1.5rem/1 var(--font-sans);
  letter-spacing: 0.04em;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav a {
  display: inline-block;
  padding: 0.35rem 0;
  text-decoration: none;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
}

.nav a:hover {
  color: var(--ink);
}

.nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter) var(--space);
}

/* ---------- hero ---------- */

.hero {
  margin: 0 auto;
  max-width: 60rem;
}

.hero__image {
  display: block;
  width: 100%;
}

.hero__wordmark {
  display: none;
}

@media (max-width: 640px) {
  .hero picture img {
    max-width: 300px;
    margin: 0 auto;
  }

  .hero__wordmark {
    display: block;
    text-align: center;
    margin: 0.5rem 0 0;
  }

  .hero__wordmark-name {
    display: block;
    font: 400 3.5rem/1 var(--font-sans);
    letter-spacing: 0.02em;
  }

  .hero__wordmark-full {
    display: block;
    margin-top: 0.5rem;
    font: 500 0.85rem/1.4 var(--font-sans);
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }
}

/* ---------- intro ---------- */

.intro {
  max-width: var(--measure);
  margin: clamp(0.5rem, 2vw, 1.5rem) auto var(--space);
  text-align: center;
}

.intro__lead {
  font-size: clamp(1.4rem, 3vw, 1.75rem);
  line-height: 1.5;
  margin-bottom: 1.5em;
}

.intro__lead::after {
  content: "";
  display: block;
  width: 2.5rem;
  height: 1px;
  margin: 1.5em auto 0;
  background: var(--accent);
}

.intro p:not(.intro__lead) {
  color: var(--ink-soft);
}

.intro__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1rem 2rem;
  margin-top: 2rem;
}

/* ---------- buttons & quiet links ---------- */

.button {
  display: inline-block;
  padding: 0.8rem 1.75rem;
  font: 400 0.85rem/1.2 var(--font-sans);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--paper);
  background: var(--ink);
  border: 1px solid var(--ink);
  transition: background 0.2s ease, color 0.2s ease;
}

.button:hover {
  background: transparent;
  color: var(--ink);
}

.link-quiet {
  font: 400 0.85rem/1.2 var(--font-sans);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-soft);
}

.link-quiet:hover {
  color: var(--ink);
}

/* ---------- page header ---------- */

.page-header {
  max-width: var(--measure);
  padding: clamp(2rem, 6vw, 4rem) 0 clamp(2.5rem, 6vw, 4rem);
}

.page-header--center {
  margin: 0 auto;
  text-align: center;
}

.page-header__lead {
  font-size: 1.25rem;
  color: var(--ink-soft);
}

.notfound__mark {
  width: 200px;
}

/* ---------- sections with a vertical label ---------- */

.section {
  display: grid;
  gap: 1rem;
  padding: 3rem 0;
  border-top: 1px solid var(--line);
}

.section:last-child {
  padding-bottom: 0;
}

.section__label {
  margin: 0;
  font: 400 0.8rem/1.4 var(--font-sans);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.section__body > :last-child {
  margin-bottom: 0;
}

@media (min-width: 900px) {
  .section {
    grid-template-columns: 6rem 1fr;
    gap: 2rem;
    padding: 4rem 0;
  }

  .section__label {
    writing-mode: vertical-rl;
    justify-self: start;
    padding-left: 0.25rem;
    border-left: 1px solid var(--accent);
  }
}

.section--closing .section__body {
  max-width: var(--measure);
}

.closing {
  font-size: 1.35rem;
  line-height: 1.5;
}

.prose {
  max-width: var(--measure);
}

.list {
  max-width: var(--measure);
  list-style: none;
  margin: 0 0 1.1em;
  padding: 0;
}

.list li {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--line);
}

.list li:first-child {
  border-top: 1px solid var(--line);
}

/* ---------- principles ---------- */

.principles,
.steps {
  counter-reset: item;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 2.5rem 3rem;
}

.principles li,
.steps li {
  counter-increment: item;
}

.principles li::before,
.steps li::before {
  content: counter(item, decimal-leading-zero);
  display: block;
  margin-bottom: 0.75rem;
  font: 300 1rem/1 var(--font-sans);
  letter-spacing: 0.1em;
  color: var(--accent);
}

.principles p,
.steps p {
  color: var(--ink-soft);
  margin-bottom: 0.75em;
}

.steps p:last-child {
  margin: 1rem 0 0;
}

/* ---------- events ---------- */

.events {
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
}

.event {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1.5rem;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--line);
}

.event:first-child {
  padding-top: 0;
}

.event__date {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-family: var(--font-sans);
  color: var(--ink);
}

.event__day {
  font-size: 2.5rem;
  font-weight: 300;
  line-height: 1;
}

.event__month {
  margin-top: 0.35rem;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}

.event__title {
  margin-bottom: 0.25rem;
}

.event__meta {
  margin: 0;
  font: 400 0.95rem/1.5 var(--font-sans);
  color: var(--ink-soft);
}

.event__desc {
  margin: 0.75rem 0 0;
  max-width: var(--measure);
}

.event__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.75rem;
  margin: 0.9rem 0 0;
  font: 400 0.8rem/1.4 var(--font-sans);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.event__links a {
  color: var(--ink-soft);
}

.past-events {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: var(--measure);
}

.past-events li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
}

.past-events time {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  min-width: 16rem;
}

/* ---------- resources ---------- */

.index ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.75rem;
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  font: 400 0.85rem/1.4 var(--font-sans);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.index a {
  color: var(--ink-soft);
}

.resources {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
  gap: 2.25rem 3rem;
}

.resources h3 {
  margin-bottom: 0.2rem;
}

.resources h3 a {
  text-decoration-color: var(--line);
}

.resources__by {
  margin-bottom: 0.4rem;
  font: 400 0.9rem/1.4 var(--font-sans);
  color: var(--ink-faint);
}

.resources p:last-child {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper-deep);
}

.site-footer__inner {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 3rem var(--gutter);
  font: 400 0.95rem/1.6 var(--font-sans);
  color: var(--ink-soft);
}

.site-footer p {
  margin: 0 0 0.4rem;
}

.site-footer__name {
  color: var(--ink);
}

.site-footer__fine {
  font-size: 0.85rem;
  color: var(--ink-faint);
}

.seal {
  /* a small hanko-style seal */
  flex: none;
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  font: 500 0.95rem/1 var(--font-sans);
  letter-spacing: 0.04em;
  color: var(--paper);
  background: var(--accent);
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}