/* The Future Human — base styles
   Calm, credible, education-first. Serif for reading, sans for UI. */

:root {
  --ink:        #1a1d21;
  --ink-soft:   #424852;
  --ink-mute:   #6b727c;
  --line:       #e3e6ea;
  --line-soft:  #eef0f3;
  --paper:      #ffffff;
  --paper-warm: #f8f7f4;
  --accent:     #2f5d73;   /* muted deep teal-blue */
  --accent-dk:  #244b5d;

  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;

  --measure: 38rem;
  --wrap: 64rem;
  --space: clamp(1.25rem, 4vw, 2rem);
}

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

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

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

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
}

a { color: var(--accent); text-underline-offset: 2px; }
a:hover { color: var(--accent-dk); }

strong { font-weight: 600; }

hr { border: 0; border-top: 1px solid var(--line); margin: 2.5rem 0; }

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

/* ---- Layout helpers ---- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--space);
}
.wrap--narrow { max-width: 44rem; }

.eyebrow {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.75rem;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 0.6rem 1rem;
  font-family: var(--sans);
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---- Header / nav ---- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.25rem;
}
.brand { text-decoration: none; color: var(--ink); }
.brand__name {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

.nav__toggle {
  display: none;
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 500;
  background: none;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.4rem 0.75rem;
  color: var(--ink);
  cursor: pointer;
}
.nav__menu {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--sans);
  font-size: 0.95rem;
}
.nav__menu a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}
.nav__menu a:hover { color: var(--ink); }
.nav__menu a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

@media (max-width: 640px) {
  .nav__toggle { display: inline-block; }
  .nav__menu {
    display: none;
    position: absolute;
    right: var(--space);
    margin-top: 0.5rem;
    flex-direction: column;
    gap: 0.25rem;
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 0.5rem 1rem;
    box-shadow: 0 8px 24px rgba(20,25,35,0.08);
    z-index: 50;
  }
  .nav__menu.is-open { display: flex; }
  .nav { position: relative; }
}

/* ---- Footer ---- */
.site-footer {
  margin-top: 5rem;
  border-top: 1px solid var(--line);
  background: var(--paper-warm);
  padding-block: 2.5rem;
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--ink-mute);
}
.site-footer__legal { margin: 0 0 0.4rem; max-width: 48rem; line-height: 1.6; }
.site-footer__copy { margin: 0; }

/* ---- Sections ---- */
.section { padding-block: clamp(2.5rem, 6vw, 4rem); }
.section--warm { background: var(--paper-warm); border-block: 1px solid var(--line); }
.section__lead {
  max-width: var(--measure);
  font-size: 1.05rem;
  color: var(--ink-soft);
}

/* ---- Hero ---- */
.hero { padding-block: clamp(3rem, 8vw, 5.5rem) clamp(2rem, 5vw, 3rem); }
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  margin: 0 0 0.5rem;
  max-width: 18ch;
}
.hero__tagline {
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  font-weight: 400;
  color: var(--ink-soft);
  margin: 0 0 1.5rem;
  max-width: 30ch;
}
.hero__intro {
  max-width: var(--measure);
  font-size: 1.15rem;
}

/* ---- Buttons ---- */
.btn-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.75rem; }
.btn {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  padding: 0.65rem 1.25rem;
  border-radius: 7px;
  border: 1px solid var(--accent);
  transition: background-color 0.15s ease, color 0.15s ease;
}
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-dk); border-color: var(--accent-dk); color: #fff; }
.btn--ghost { background: transparent; color: var(--accent); }
.btn--ghost:hover { background: var(--accent); color: #fff; }

/* ---- Cards (focus areas) ---- */
.cards {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  margin-top: 2rem;
}
.card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.5rem;
  background: var(--paper);
}
.card h3 { margin: 0 0 0.5rem; font-size: 1.2rem; }
.card p { margin: 0; font-size: 1rem; color: var(--ink-soft); }

/* ---- Prose (articles + page bodies) ---- */
.prose { max-width: var(--measure); }
.prose > * + * { margin-top: 1.1rem; }
.prose h2 { font-size: 1.6rem; margin-top: 2.5rem; }
.prose h3 { font-size: 1.25rem; margin-top: 2rem; }
.prose h2 a, .prose h3 a { color: inherit; text-decoration: none; }
.prose ul, .prose ol { padding-left: 1.4rem; }
.prose li + li { margin-top: 0.4rem; }
.prose blockquote {
  margin: 1.75rem 0;
  padding-left: 1.25rem;
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
  font-style: italic;
}
.prose a { text-decoration: underline; }

/* ---- Page header ---- */
.page-header { padding-block: clamp(2.5rem, 6vw, 4rem) 1rem; }
.page-header h1 { font-size: clamp(2rem, 5vw, 2.8rem); margin: 0 0 0.5rem; }
.page-body { padding-block: 1rem clamp(2rem, 5vw, 3rem); }

/* ---- Numbered work blocks ---- */
.work-block { padding-block: 2rem; border-top: 1px solid var(--line-soft); }
.work-block:first-of-type { border-top: 0; }
.work-block h2 { font-size: 1.5rem; margin: 0 0 0.6rem; }
.work-block__num {
  font-family: var(--sans);
  font-weight: 600;
  color: var(--accent);
  margin-right: 0.5rem;
}
.work-block p { max-width: var(--measure); color: var(--ink-soft); margin: 0; }

/* ---- Article ---- */
.article { padding-block: clamp(2.5rem, 6vw, 4rem); }
.article__header { margin-bottom: 2rem; }
.article__header h1 { font-size: clamp(2rem, 5vw, 2.9rem); margin: 0 0 0.75rem; }
.article__summary { font-size: 1.2rem; color: var(--ink-soft); margin: 0 0 1rem; }
.article__meta { font-family: var(--sans); font-size: 0.9rem; color: var(--ink-mute); margin: 0; }
.article__rule { margin-top: 3rem; }
.article__back { font-family: var(--sans); font-size: 0.95rem; }

/* ---- Writing index ---- */
.post-list { list-style: none; margin: 2rem 0 0; padding: 0; max-width: 46rem; }
.post-list__item { padding-block: 1.5rem; border-top: 1px solid var(--line); }
.post-list__item:first-child { border-top: 0; }
.post-list__item h2 { font-size: 1.4rem; margin: 0 0 0.4rem; }
.post-list__item h2 a { text-decoration: none; }
.post-list__item h2 a:hover { text-decoration: underline; }
.post-list__summary { margin: 0 0 0.4rem; color: var(--ink-soft); }
.post-list__meta { font-family: var(--sans); font-size: 0.85rem; color: var(--ink-mute); margin: 0; }

.placeholder-note {
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--ink-mute);
  background: var(--paper-warm);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  max-width: var(--measure);
}

/* ---- Bio ---- */
.bio { margin-top: 1.5rem; }
.bio__name { margin: 0 0 0.5rem; font-size: 1.2rem; }
.bio p { margin: 0; color: var(--ink-soft); }

/* ---- Contact ---- */
.contact-list { list-style: none; margin: 1.5rem 0; padding: 0; max-width: var(--measure); }
.contact-list li { padding-block: 0.5rem; }
.contact-list .label {
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-mute);
  display: block;
}

/* ---- Footnotes (markdown-it-footnote) ---- */
.footnotes { font-size: 0.95rem; color: var(--ink-soft); margin-top: 3rem; }
.footnotes hr { display: none; }
.footnotes-list { padding-left: 1.2rem; }