/* mathbeacon.com - shared theme. Loads after UIkit and overrides it.
   Mobile first: base rules are for a 360px screen, wider layouts are layered on with min-width queries. */

:root {
  color-scheme: only light;
  --bg: #F3F9F5;
  --panel: #E3EFE7;
  --ink: #0F2E1F;
  --muted: #4D6B5A;
  --accent: #1B6B45;
  --accent-ink: #FFFFFF;
  --display: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
  --text: 'Open Sans', 'Helvetica Neue', Arial, sans-serif;
  --gut: 16px;
  --off: 8px;
  --radius: 3px;
}

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

html {
  background-color: var(--bg);
  color: var(--ink);
  font-family: var(--text);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body, body.post {
  margin: 0;
  background-color: var(--bg);
  color: var(--ink);
  font-family: var(--text);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  line-height: 1.75;
  overflow-wrap: break-word;
}

::selection { background-color: var(--panel); color: var(--ink); }

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

h1, h2, h3, h4 {
  margin: 0;
  color: var(--ink);
  font-family: var(--display);
  text-transform: none;
}

p, dl, dd, dt, figure, ul { margin: 0; }

a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; transition: color .2s ease; }
a:hover { color: var(--ink); text-decoration: underline; }
a:focus-visible, .cta:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 3px;
}

/* ---------- containers (UIkit overrides) ---------- */
.uk-container {
  box-sizing: border-box;
  width: 100%;
  max-width: calc(940px + (var(--gut) * 2));
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gut);
  padding-right: var(--gut);
}

@media (min-width: 480px) { :root { --gut: 20px; --off: 10px; } }
@media (min-width: 768px) { :root { --gut: 32px; --off: 12px; } }

.uk-section { background-color: var(--bg); color: var(--ink); }

/* ---------- skip link ---------- */
.skip {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 1000;
  padding: .75rem 1.1rem;
  background-color: var(--accent);
  color: var(--accent-ink);
  font: 600 .95rem/1.2 var(--display);
  text-decoration: none;
  border-radius: 0 0 var(--radius) 0;
}
.skip:focus { left: 0; color: var(--accent-ink); outline: 3px solid var(--ink); outline-offset: 0; }

/* ---------- boxed masthead ---------- */
.mast { padding-top: 16px; padding-bottom: 0; background-color: var(--bg); color: var(--ink); }
.mast-box {
  border: 2px solid var(--accent);
  background-color: var(--bg);
  color: var(--ink);
}
.mast-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 8px 12px 0;
  font: 500 .75rem/1.3 var(--display);
  letter-spacing: .02em;
  color: var(--muted);
}
.mast-ed { color: var(--muted); }
.mast-label { color: var(--accent); font-weight: 700; text-align: right; }
.mast-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 14px 12px 20px;
  color: var(--ink);
  text-decoration: none;
}
.mast-brand:hover { color: var(--ink); text-decoration: none; }
.mast-brand svg { width: 40px; height: 20px; flex: none; }
.mast-word {
  font: 800 clamp(1.1rem, 4.9vw, 2rem)/1 var(--display);
  letter-spacing: .26em;
  margin-right: -.26em;
  color: var(--ink);
}
.mast-nav {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 0 4px;
  padding: 2px 0 6px;
}
.mast-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 10px;
  border-bottom: 2px solid transparent;
  font: 600 .875rem/1.2 var(--display);
  color: var(--ink);
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease;
}
.mast-nav a:hover,
.mast-nav a:focus-visible { color: var(--accent); border-bottom-color: var(--accent); text-decoration: none; }
.mast-nav a[aria-current="page"] { color: var(--accent); }

@media (min-width: 768px) {
  .mast { padding-top: 24px; }
  .mast-top { padding: 12px 20px 0; font-size: .8125rem; }
  .mast-brand { padding: 10px 20px 28px; gap: 18px; }
  .mast-brand svg { width: 52px; height: 26px; }
}

/* ---------- opening (hero) ---------- */
.opening { padding: 0 0 8px; background-color: var(--bg); color: var(--ink); }
.opening-inner { border-top: 3px double var(--accent); padding-top: 28px; }
.opening-media, .opening-text { width: 100%; min-width: 0; }
.opening-text { padding-top: 28px; text-align: center; }

.meta {
  margin: 0 0 14px;
  font: 500 .8125rem/1.4 var(--text);
  letter-spacing: .03em;
  color: var(--muted);
}

h1 {
  font: 800 clamp(1.6rem, 1.15rem + 2.2vw, 2.25rem)/1.18 var(--display);
  letter-spacing: -.01em;
  color: var(--ink);
}

.dek {
  max-width: 34rem;
  margin: 1.1rem auto 0;
  font-size: clamp(1rem, .95rem + .3vw, 1.1875rem);
  line-height: 1.6;
  color: var(--muted);
}

@media (min-width: 768px) {
  .opening-inner { padding-top: 44px; }
  .opening-media { width: 38%; }
  .opening-text { width: 62%; padding: 0 0 0 clamp(32px, 5vw, 56px); }
}

/* ---------- article rows: left rail + column ---------- */
.sec { padding: 40px 0; background-color: var(--bg); color: var(--ink); }
.sec--intro { padding-top: 28px; padding-bottom: 8px; }
.sec--legal { padding: 24px 0; }

.row { width: 100%; }
.rail { width: 100%; min-width: 0; margin-bottom: 1.25rem; }
.rail-kicker {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 .6rem;
  font: 600 .8125rem/1.3 var(--display);
  letter-spacing: .04em;
  color: var(--accent);
}
.rail-kicker::before {
  content: "";
  flex: none;
  width: 18px;
  height: 10px;
  border: 1.5px solid var(--accent);
  border-radius: 10px;
  background: linear-gradient(90deg, var(--accent) 50%, transparent 50%);
}
.rail h2 {
  font: 700 clamp(1.35rem, 1.2rem + .8vw, 1.5rem)/1.25 var(--display);
  color: var(--ink);
}
.rail-note { display: none; }

.col { width: 100%; min-width: 0; }
.col p { margin: 0 0 1.1rem; }
.col > :last-child { margin-bottom: 0; }

@media (min-width: 768px) {
  .opening--legal { padding-bottom: 0; }
  .sec { padding: 64px 0; }
  .sec--intro { padding-top: 40px; padding-bottom: 8px; }
  .sec--legal { padding: 30px 0; }
  .rail {
    width: 200px;
    margin-bottom: 0;
    position: sticky;
    top: 24px;
    align-self: flex-start;
  }
  .rail h2 { font-size: 1.2rem; line-height: 1.3; }
  .rail-note {
    display: block;
    margin: .9rem 0 0;
    font-size: .875rem;
    line-height: 1.55;
    color: var(--muted);
  }
  .col { width: calc(100% - 200px); padding-left: 40px; }
}
@media (min-width: 1024px) {
  .sec { padding: 72px 0; }
  .sec--legal { padding: 34px 0; }
  .col { padding-left: 60px; }
}

/* ---------- question and answer ---------- */
.qa + .qa { margin-top: 2.5rem; }
.q {
  position: relative;
  margin: 0 0 .75rem;
  padding-left: 30px;
  font: 600 1.0625rem/1.4 var(--display);
  color: var(--ink);
}
.q::before {
  content: "";
  position: absolute;
  left: 0;
  top: .4em;
  width: 18px;
  height: 10px;
  border: 1.5px solid var(--accent);
  border-radius: 10px;
  background: linear-gradient(90deg, var(--accent) 50%, transparent 50%);
}
@media (min-width: 768px) { .q { font-size: 1.125rem; } }

.col .lead-in { margin: 1.75rem 0 0; color: var(--ink); }

/* ---------- definition cards ---------- */
.concepts { display: grid; gap: 14px; margin: 1.75rem 0 0; padding: 0; }
.concept {
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.1rem 1.15rem 1.2rem;
  background-color: var(--bg);
  color: var(--ink);
}
.concept dt {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 .5rem;
  font: 700 .95rem/1.3 var(--display);
  color: var(--accent);
}
.concept dt::before {
  content: "";
  flex: none;
  width: 11px;
  height: 11px;
  border: 2px solid var(--accent);
  border-radius: 50%;
}
.concept dd { margin: 0; font-size: .9375rem; line-height: 1.6; color: var(--ink); }
@media (min-width: 1024px) { .concepts { grid-template-columns: repeat(3, 1fr); } }

/* ---------- figures with hard offset shadow ---------- */
.fig { width: calc(100% - var(--off)); margin: 2.25rem 0 2.5rem; }
.frame {
  position: relative;
  aspect-ratio: 40 / 21;
  overflow: hidden;
  background-color: var(--panel);
  border-radius: var(--radius);
  box-shadow: var(--off) var(--off) 0 var(--accent);
}
.frame img, .frame video { display: block; width: 100%; height: 100%; object-fit: cover; }
.fig figcaption {
  margin-top: calc(var(--off) + .7rem);
  font-size: .875rem;
  line-height: 1.5;
  color: var(--muted);
}
.fig--hero { margin: 0; }
.fig--hero .frame { aspect-ratio: 16 / 10; }
.fig--hero .frame img { object-position: 70% 40%; }
.fig--photo .frame { aspect-ratio: 3 / 2; }
@media (min-width: 768px) {
  .fig--hero .frame { aspect-ratio: 4 / 5; }
  .fig--hero .frame img { object-position: 66% 50%; }
  .fig--inset { width: calc(88% - var(--off)); margin-left: auto; margin-right: var(--off); }
}

/* ---------- call to action: two-line solid button ---------- */
.cta-wrap { margin: 1.5rem 0 0; }
.cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  min-height: 56px;
  padding: .85rem 1.25rem;
  border-radius: var(--radius);
  background-color: var(--accent);
  color: var(--accent-ink);
  text-decoration: none;
  transition: background-color .2s ease;
}
.cta:hover, .cta:focus-visible { background-color: var(--ink); color: var(--accent-ink); text-decoration: none; }
.cta-text { display: flex; flex-direction: column; gap: 2px; text-align: left; }
.cta-label { font: 700 1rem/1.3 var(--display); color: var(--accent-ink); }
.cta-sub { font: 400 .8125rem/1.4 var(--text); color: var(--panel); }
.cta-arrow { flex: none; width: 20px; height: 20px; transition: transform .2s ease; }
.cta:hover .cta-arrow, .cta:focus-visible .cta-arrow { transform: translateX(4px); }
@media (min-width: 480px) {
  .cta { display: inline-flex; width: auto; min-width: 22rem; }
}

/* ---------- legal pages ---------- */
.revision, .col .revision {
  margin: .9rem 0 0;
  font: 500 .875rem/1.5 var(--text);
  color: var(--muted);
}
.page-head h1 { text-align: left; }

/* ---------- footer ---------- */
.foot {
  margin-top: 56px;
  padding: 40px 0 56px;
  border-top: 1px solid var(--accent);
  background-color: var(--bg);
  color: var(--ink);
}
.company { margin: 0 0 1.5rem; font-size: .9375rem; line-height: 1.7; color: var(--ink); }
.company p { margin: 0 0 .4rem; }
.company .company-lead { font: 700 1rem/1.5 var(--display); color: var(--ink); }
.legal_links { display: flex; flex-wrap: wrap; gap: 0 14px; margin: 0 0 1.25rem; }
.legal_links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font: 600 .875rem/1.2 var(--display);
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.legal_links a:hover, .legal_links a:focus-visible { color: var(--ink); }
.end_line { max-width: 46rem; margin: 0; font-size: .8125rem; line-height: 1.65; color: var(--muted); }

@media (min-width: 768px) {
  .foot { margin-top: 72px; padding: 48px 0 64px; }
  .legal_links { gap: 0 22px; }
}

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