/* ---------------------------------------------------
   Self-hosted font — ET Book (MIT licensed)
   https://github.com/edwardtufte/et-book
--------------------------------------------------- */
@font-face {
  font-family: "et-book";
  src: url("fonts/et-book/et-book-roman-line-figures/et-book-roman-line-figures.woff") format("woff"),
       url("fonts/et-book/et-book-roman-line-figures/et-book-roman-line-figures.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "et-book";
  src: url("fonts/et-book/et-book-display-italic-old-style-figures/et-book-display-italic-old-style-figures.woff") format("woff"),
       url("fonts/et-book/et-book-display-italic-old-style-figures/et-book-display-italic-old-style-figures.ttf") format("truetype");
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "et-book";
  src: url("fonts/et-book/et-book-bold-line-figures/et-book-bold-line-figures.woff") format("woff"),
       url("fonts/et-book/et-book-bold-line-figures/et-book-bold-line-figures.ttf") format("truetype");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* ---------------------------------------------------
   Tokens — light (default) and dark
--------------------------------------------------- */
:root {
  --paper: #f0ebdd;
  --ink: #17140f;
  --ink-soft: #6b6558;
  --rule: rgba(23, 20, 15, 0.15);
  --measure: 640px;
  --serif: "et-book", Palatino, "Palatino Linotype", Georgia, "Times New Roman", serif;
}

html[data-theme="dark"] {
  --paper: #1a1712;
  --ink: #f0ebdd;
  --ink-soft: #a39c8a;
  --rule: rgba(240, 235, 221, 0.18);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background .2s ease, color .2s ease;
}

::selection { background: var(--ink); color: var(--paper); }

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--ink);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
a:hover { opacity: 0.65; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

/* ---------------------------------------------------
   Layout
--------------------------------------------------- */
.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 40px 24px 96px;
}

header.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 56px;
}

header.site-header .brand {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 22px;
  text-decoration: none;
}

header.site-header .controls {
  display: flex;
  align-items: center;
  gap: 18px;
}

.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--ink);
  padding: 4px;
  line-height: 0;
}

/* dark-mode toggle switch */
.theme-toggle {
  width: 44px;
  height: 24px;
  border-radius: 999px;
  border: 1.5px solid var(--ink);
  background: var(--paper);
  position: relative;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}
.theme-toggle .knob {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  transition: transform .18s ease;
}
html[data-theme="dark"] .theme-toggle .knob {
  transform: translateX(20px);
}

/* ---------------------------------------------------
   Intro / bio
--------------------------------------------------- */
.intro h1 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(38px, 6vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 24px;
}

.intro p {
  font-size: 19px;
  margin: 0 0 16px;
  max-width: 58ch;
}

/* ---------------------------------------------------
   Section lists (essays, posts, research, op-eds...)
--------------------------------------------------- */
section.list {
  margin-top: 44px;
}

section.list h2 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 24px;
  margin: 0 0 14px;
}

section.list ul {
  list-style: disc;
  padding-left: 22px;
  margin: 0;
}

section.list li {
  margin-bottom: 10px;
}

section.list li a {
  font-size: 19px;
}

section.list li .meta {
  color: var(--ink-soft);
  font-size: 16px;
  margin-left: 4px;
}

/* ---------------------------------------------------
   Essay / post page
--------------------------------------------------- */
.essay h1 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(34px, 5.5vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
}

.essay .dek {
  font-style: italic;
  font-size: 22px;
  color: var(--ink-soft);
  line-height: 1.35;
  margin: 0 0 28px;
  max-width: 58ch;
}

.essay .date {
  font-size: 17px;
  color: var(--ink-soft);
  margin-bottom: 36px;
  display: block;
}

.essay p {
  max-width: var(--measure);
  margin: 0 0 22px;
}

.essay .contents {
  margin: 0 0 40px;
}
.essay .contents h2 {
  font-weight: 700;
  font-size: 24px;
  margin-bottom: 14px;
}
.essay .contents ol {
  padding-left: 22px;
  margin: 0;
}
.essay .contents li { margin-bottom: 8px; }

.back {
  display: inline-block;
  margin-bottom: 32px;
  font-size: 16px;
  color: var(--ink-soft);
  text-decoration: none;
}
.back:hover { text-decoration: underline; }

/* ---------------------------------------------------
   Footer
--------------------------------------------------- */
footer {
  margin-top: 72px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  font-size: 15px;
  color: var(--ink-soft);
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

@media (max-width: 480px) {
  .wrap { padding: 28px 18px 72px; }
  body { font-size: 18px; }
}