:root {
  --bg: #faf8f4;
  --ink: #2a2a28;
  --muted: #6f6a5f;
  --line: #e6e1d7;
  --accent: #3a3a36;
  --highlight: #f2efe8;
}

/* Base */
body {
  margin: 0;
  background: var(--bg);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  line-height: 1.65;
}

p {
  margin-bottom: 18px;
}

em {
  font-style: italic;
}

/* Layout */
.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px 96px;
}

.hero {
  text-align: center;
  padding: 96px 20px 56px;
}

.hero h1 {
  font-size: 2.4rem;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.hero p.sub {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 720px;
  margin: 0 auto;
}

/* Headings */
h2 {
  font-size: 1.9rem;
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

h3 {
  margin-top: 48px;
  margin-bottom: 6px;
}

/* Dividers */
hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 56px 0;
}

/* Navigation */
nav {
  text-align: center;
  margin-bottom: 48px;
  font-size: 0.9rem;
  color: var(--muted);
}

nav a {
  color: var(--ink);
  text-decoration: none;
}

/* Highlighted session box */
.session-box {
  background: var(--highlight);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 28px 28px 30px;
  margin: 48px 0;
}

.session-box .default {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 12px;
}

/* Foundation note */
.foundation-note {
  font-size: 0.9rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 20px;
  margin-top: 40px;
}

/* Call to action */
.cta {
  text-align: center;
  margin: 56px 0 40px;
}

.button {
  display: inline-block;
  padding: 14px 34px;
  background: var(--accent);
  color: #ffffff;
  text-decoration: none;
  border-radius: 8px;
  font-size: 0.95rem;
}

.note {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--muted);
}

/* Footer */
footer {
  margin-top: 72px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

/* ------------------------------
   Mobile & Performance Pass
   ------------------------------ */

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

html {
  overflow-x: hidden;
}

/* Mobile adjustments */
@media (max-width: 768px) {

  body {
    line-height: 1.6;
  }

  .hero {
    padding: 72px 20px 40px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.6rem;
  }

  .container {
    padding-bottom: 72px;
  }

  .cta {
    margin: 48px 0 32px;
  }

  .button {
    display: block;
    width: 100%;
    max-width: 360px;
    margin: 0 auto;
  }

}