/* Open Mathematics Consortium */

:root {
  --bg: #000000;
  --text: #ffffff;
  --muted: rgba(255, 255, 255, 0.65);
  --rule: rgba(255, 255, 255, 0.16);
  --tab-hover: rgba(255, 255, 255, 0.08);
  --tab-active: rgba(255, 255, 255, 0.16);
  --sans: "Open Sans", Arial, sans-serif;
  --width: 1120px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

.wrap {
  max-width: var(--width);
  margin: 0 auto;
  padding: 0 16px;
}

a { color: var(--text); }

/* Header and tabs */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 72px;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

@media (max-width: 480px) {
  .wordmark-text { display: none; }
}

.site-nav {
  display: flex;
  gap: 4px;
}

.site-nav a {
  padding: 6px 12px;
  border-radius: 6px;
  color: var(--text);
  text-decoration: none;
  font-size: 14.4px;
  font-weight: 500;
  transition: background-color 0.15s;
}

.site-nav a:hover { background: var(--tab-hover); }

.site-nav a[aria-current="page"] { background: var(--tab-active); }

.menu-button {
  display: none;
  margin-left: auto;
  padding: 8px;
  background: none;
  border: 0;
  color: var(--text);
  cursor: pointer;
}

.menu-button svg { display: block; }

@media (max-width: 720px) {
  .menu-button { display: block; }

  .site-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 8px 16px 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--rule);
  }

  .site-nav.open { display: flex; }

  .site-nav a {
    padding: 10px 12px;
    font-size: 16px;
  }
}

/* Home */

.hero {
  padding: 96px 0 80px;
}

.hero-logo {
  display: block;
  width: clamp(200px, 36vw, 352px);
  height: auto;
  margin-bottom: 40px;
}

.hero h1 {
  margin: 0 0 24px;
  font-size: clamp(36px, 7vw, 64px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: 0.01em;
}

.members-line {
  margin: 0 0 32px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.lede {
  margin: 0;
  max-width: 640px;
  font-size: 20px;
}

/* Inner pages */

.page {
  padding: 64px 0 96px;
}

.page h1 {
  margin: 0 0 32px;
  font-size: clamp(30px, 5vw, 42px);
  font-weight: 300;
}

.page > .wrap > p { max-width: 720px; }

h2 {
  margin: 0 0 4px;
  font-size: 20px;
  font-weight: 600;
}

/* Members */

.members {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 720px) {
  .members { grid-template-columns: repeat(3, 1fr); }
  .members-two { grid-template-columns: repeat(2, 1fr); }
}

.member {
  padding: 24px;
  border: 1px solid var(--rule);
  border-radius: 10px;
}

.member h2 a {
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 4px;
}

.member h2 a:hover { text-decoration-color: var(--text); }

.member p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--rule);
  padding: 24px 0 40px;
  font-size: 13px;
  color: var(--muted);
}