/* Shared styles for / and /teaching */
:root {
  --black: #000000;
  --grey: #555555;
  --white: #ffffff;
  --sans: 'IBM Plex Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --rule: 1px solid var(--black);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--white);
  color: var(--black);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--black); text-decoration: none; }
a:hover { color: var(--grey); }
.arrow { display: inline-block; transition: transform 0.2s ease; }
a:hover .arrow, a:focus-visible .arrow { transform: translateX(4px); }
@media (prefers-reduced-motion: reduce) { .arrow { transition: none; } }
a:focus-visible { outline: 2px solid var(--black); outline-offset: 3px; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 32px; }
.mono { font-family: var(--mono); }
.grey { color: var(--grey); }

/* ===== HEADER ===== */
.site-header {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center;
  gap: 16px; padding: 32px 0; border-bottom: var(--rule);
}
.site-name { font-weight: 600; font-size: 18px; text-decoration: none; }
.site-nav { display: flex; flex-wrap: wrap; gap: 12px 28px; font-family: var(--mono); font-size: 14px; }
.site-nav a { text-decoration: none; }

/* ===== OPENING ===== */
.opening { padding: 120px 0 112px; }
.opening-label { margin: 0 0 32px; font-family: var(--mono); font-size: 14px; color: var(--grey); }
.opening-label a { color: var(--black); }
.opening-label a:hover { color: var(--grey); }
.opening h1 {
  margin: 0; max-width: 900px;
  font-size: clamp(32px, 6vw, 52px); line-height: 1.12; font-weight: 500; letter-spacing: -0.02em;
}

/* ===== SECTIONS ===== */
.section { padding: 0 0 112px; scroll-margin-top: 24px; }
.section-head {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline;
  gap: 8px 16px; padding-bottom: 16px; border-bottom: var(--rule);
}
.section-label {
  margin: 0; font-family: var(--mono); font-size: 14px; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.08em;
}
.section-meta { font-family: var(--mono); font-size: 14px; color: var(--grey); }

/* ===== PROJECTS ===== */
.project {
  display: flex; flex-wrap: wrap; gap: 24px 48px;
  padding: 40px 0; border-bottom: var(--rule);
}
.project-id { flex: 1 1 240px; display: flex; flex-direction: column; gap: 8px; }
.project-id h3 { margin: 0; font-size: 24px; font-weight: 600; }
.project-num, .project-domain { font-family: var(--mono); font-size: 13px; color: var(--grey); }
.project-body { flex: 3 1 480px; min-width: 0; display: flex; flex-direction: column; gap: 20px; }
.project-thesis { margin: 0; font-size: 19px; line-height: 1.55; }
.project-inside { margin: 0; font-size: 16px; line-height: 1.55; color: var(--grey); }
.project-links { display: flex; flex-wrap: wrap; gap: 12px 24px; font-family: var(--mono); font-size: 14px; }
.tag { padding: 4px 10px; border: var(--rule); }

/* ===== THINKING ===== */
.notes {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr));
  gap: 24px; padding-top: 40px;
}
.note {
  display: flex; flex-direction: column; justify-content: space-between; gap: 32px;
  min-height: 240px; padding: 28px; border: var(--rule); text-decoration: none;
}
.note p { margin: 0; font-size: 18px; line-height: 1.5; }
.note-source { font-family: var(--mono); font-size: 13px; color: var(--grey); }

.essays-label { margin: 72px 0 0; padding-bottom: 16px; border-bottom: var(--rule); }
.essay {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline;
  gap: 8px 32px; padding: 24px 0; border-bottom: var(--rule); text-decoration: none;
}
.essay-text { flex: 1 1 420px; min-width: 0; display: flex; flex-direction: column; gap: 6px; }
.essay-title { font-size: 20px; font-weight: 500; }
.essay-sub { font-size: 16px; color: var(--grey); }
.essay-date { font-family: var(--mono); font-size: 13px; color: var(--grey); }

/* ===== FOOTER ===== */
.site-footer {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px;
  padding: 40px 0 64px; border-top: var(--rule);
  font-family: var(--mono); font-size: 14px;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 12px 28px; }

/* ===== PHONE ===== */
@media (max-width: 600px) {
  .container { padding: 0 20px; }
  .site-header { padding: 24px 0; }
  .opening { padding: 72px 0 80px; }
  .section { padding-bottom: 80px; }
  .project { padding: 32px 0; }
  .project-id, .project-body, .essay-text { flex-basis: 100%; }
  .project-thesis { font-size: 18px; }
  .note { min-height: 0; padding: 24px; }
  .essays-label { margin-top: 56px; }
}