/* SLRCH — Society for Light, Rhythms, and Circadian Health
   Design tokens: a light-cycle palette (dawn amber -> daylight teal -> night navy)
   used as the site's signature gradient rule under every section header. */

:root {
  --navy: #1c2541;
  --navy-soft: #2c3759;
  --teal: #3e7c8c;
  --amber: #e3a857;
  --paper: #f5f6f8;
  --paper-raised: #ffffff;
  --ink: #1c2541;
  --ink-soft: #565f78;
  --line: #dfe3ea;

  --font-display: "Source Serif 4", Georgia, serif;
  --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, sans-serif;

  --gradient-cycle: linear-gradient(90deg, var(--navy) 0%, var(--teal) 50%, var(--amber) 100%);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  font-size: 17px;
}

a { color: var(--teal); }
a:hover { color: var(--navy); }

img { max-width: 100%; display: block; }

.container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Header / nav ---- */

.site-header {
  background: var(--navy);
  border-bottom: 4px solid transparent;
  border-image: var(--gradient-cycle) 1;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
  flex-wrap: wrap;
  gap: 12px;
}

.site-header .logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
  letter-spacing: 0.01em;
}

.site-header .logo span {
  display: block;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--amber);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 2px;
}

.site-nav { display: flex; gap: 22px; flex-wrap: wrap; }

.nav-item { position: relative; }

.site-nav a {
  color: #cfd6e6;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}

.site-nav a:hover, .site-nav a.active { color: var(--amber); }

.nav-item .dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  padding-top: 14px; /* keeps the visual gap, but as part of a hoverable box */
  z-index: 30;
}

.nav-item .dropdown-inner {
  background: var(--navy-soft);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  min-width: 190px;
  padding: 6px 0;
}

.nav-item:hover .dropdown,
.nav-item:focus-within .dropdown {
  display: block;
}

.nav-item .dropdown a {
  display: block;
  padding: 9px 18px;
  font-size: 0.9rem;
  white-space: nowrap;
}

.nav-item .dropdown a:hover {
  background: rgba(255, 255, 255, 0.06);
}

/* ---- Hero ---- */

.hero {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 10px;
}

h1 {
  font-family: var(--font-display);
  font-size: 2.6rem;
  line-height: 1.1;
  margin: 0 0 16px;
  color: var(--navy);
}

h2 {
  font-family: var(--font-display);
  font-size: 1.7rem;
  color: var(--navy);
  margin: 0 0 14px;
}

h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--navy);
  margin: 0 0 10px;
}

.lede {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 620px;
}

/* ---- Section rule: the signature gradient divider ---- */

.section-rule {
  height: 3px;
  width: 64px;
  background: var(--gradient-cycle);
  border: none;
  margin: 0 0 20px;
}

section { padding: 48px 0; }
section + section { border-top: 1px solid var(--line); }

/* ---- Cards ---- */

.card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 24px;
}

.card + .card { margin-top: 16px; }

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.grid-2 .card + .card { margin-top: 0; }

@media (max-width: 720px) {
  .grid-2 { grid-template-columns: 1fr; }
  h1 { font-size: 2rem; }
}

/* ---- Buttons ---- */

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 4px;
  font-weight: 600;
  text-decoration: none;
  font-size: 0.95rem;
}

.btn-primary {
  background: var(--amber);
  color: var(--navy);
}
.btn-primary:hover { background: #d6963f; color: var(--navy); }

.btn-secondary {
  background: transparent;
  color: var(--navy);
  border: 1.5px solid var(--navy);
}
.btn-secondary:hover { background: var(--navy); color: #fff; }

/* ---- Alert / notice banner ---- */

.notice {
  background: #fff7ea;
  border: 1px solid var(--amber);
  border-left: 4px solid var(--amber);
  border-radius: 4px;
  padding: 16px 20px;
  font-size: 0.95rem;
  margin-bottom: 28px;
}

.notice strong { color: var(--navy); }

/* ---- Key dates list ---- */

.dates-list { list-style: none; padding: 0; margin: 0; }
.dates-list li {
  display: flex;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.98rem;
}
.dates-list li:last-child { border-bottom: none; }
.dates-list .date { font-weight: 600; color: var(--navy); }

/* ---- Membership tiers ---- */

.tier {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 22px;
  background: var(--paper-raised);
  text-align: left;
}
.tier .price {
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--navy);
  margin: 6px 0 12px;
}

/* ---- Markdown content wrapper ----
   Collaborators just write `## Heading` in Markdown; this automatically
   draws the signature gradient bar above it, so nobody has to remember
   to add <hr class="section-rule"> by hand. */

.content {
  padding: 40px 20px 60px;
}

.content h2 {
  margin-top: 52px;
}

.content h2:first-child {
  margin-top: 0;
}

.content h2::before {
  content: "";
  display: block;
  height: 3px;
  width: 64px;
  background: var(--gradient-cycle);
  margin-bottom: 20px;
}

.content h3 {
  margin-top: 28px;
}

.content > p,
.content > ul,
.content > ol {
  max-width: 900px;
}

/* ---- Footer ---- */

.site-footer {
  background: var(--navy);
  color: #cfd6e6;
  padding: 36px 0;
  margin-top: 48px;
  font-size: 0.9rem;
}
.site-footer a { color: #fff; }