/* ---------------------------------------------------------------------------
   lrenazhou.com — editorial
   Swap --serif for a webfont stack to change the whole voice of the site.
   --------------------------------------------------------------------------- */

/* Palette: Celadon (青瓷) — jade accent on a pale green-grey ground. */
:root {
  --paper:      #f2f5ef;
  --ink:        #1b211c;
  --muted:      #626b60;
  --rule:       #d5dcd1;
  --rule-soft:  #e4e9e0;
  --accent:     #2f6b52; /* jade — nav, marks, hover states */
  --link:       #0d7d55; /* brighter, higher-chroma jade — links */
  --link-hover: #0a6044;
  --link-rule:  #a3cfba; /* link underlines */
  --shadow:     rgba(27, 33, 28, .20);

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua",
           "Source Serif 4", "Source Serif Pro", Georgia, "Times New Roman", serif;
  --sans:  ui-sans-serif, -apple-system, BlinkMacSystemFont, "Helvetica Neue",
           Arial, sans-serif;
  --mono:  ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --measure: 38rem;
  --wordmark-size: clamp(1.6rem, 5.5vw, 2.25rem);
  --portrait-size: clamp(3.4rem, 11vw, 5rem);

  color-scheme: light;
}

/* Dark palette, declared once and applied from two places below.
   1. the media query  — the reader's system setting, and the no-JS fallback
   2. [data-theme]     — an explicit choice made with the toggle, which wins
   Keep the two lists identical; only the selector differs. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper:     #10130f;
    --ink:       #e6eae2;
    --muted:     #98a095;
    --rule:      #2e352f;
    --rule-soft: #212621;
    --accent:    #6fbf98;
    --link:      #3fd39a;
    --link-hover:#6ee4b8;
    --link-rule: #2c5a47;
    --shadow:    rgba(0, 0, 0, .55);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper:     #10130f;
  --ink:       #e6eae2;
  --muted:     #98a095;
  --rule:      #2e352f;
  --rule-soft: #212621;
  --accent:    #6fbf98;
  --link:      #3fd39a;
  --link-hover:#6ee4b8;
  --link-rule: #2c5a47;
  --shadow:    rgba(0, 0, 0, .55);
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.7;
  font-kerning: normal;
  font-variant-ligatures: common-ligatures;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

.page {
  max-width: var(--measure);
  margin: 0 auto;
  padding: clamp(2.5rem, 8vw, 5rem) 1.5rem 3rem;
}

.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: 1rem; top: 1rem;
  position: fixed;
  z-index: 10;
  background: var(--paper);
  color: var(--ink);
  padding: .5rem .75rem;
  border: 1px solid var(--ink);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 1px;
}

/* --- masthead ------------------------------------------------------------ */

.masthead {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 1.75rem);
  margin-bottom: clamp(2.5rem, 7vw, 4rem);
}

.portrait {
  flex: none;
  width: var(--portrait-size);
  height: var(--portrait-size);
  object-fit: cover;
  display: block;
  border-radius: 50%;
  filter: grayscale(1);
  /* While the file is in flight the <img> box would render its alt text.
     Transparent text hides that flash — the alt attribute is untouched, so
     screen readers and a failed load still get it — and the tint gives the
     circle something to be in the meantime. */
  background: var(--rule-soft);
  color: transparent;
}

/* Hover-to-colour only where a real pointer exists. On touch, a tap sets a
   sticky :hover that the next tap elsewhere clears — which reads as a blink. */
@media (hover: hover) and (pointer: fine) {
  .portrait { transition: filter .35s ease; }
  .portrait:hover { filter: grayscale(0); }
}

.masthead-body { min-width: 0; }

/* --- theme toggle -------------------------------------------------------- */

.theme-toggle {
  position: fixed;
  top: clamp(.85rem, 2.5vw, 1.5rem);
  right: clamp(.85rem, 2.5vw, 1.5rem);
  z-index: 5;
  background: var(--paper);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  padding: 0;
  border: 1px solid var(--rule);
  border-radius: 50%;
  color: var(--muted);
  cursor: pointer;
  transition: color .12s ease, border-color .12s ease;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
.theme-toggle svg { width: 1.05rem; height: 1.05rem; display: block; }

/* Light shows the moon (click to go dark); dark shows the sun. The media query
   covers the no-JS case; the [data-theme] rules come after so a choice wins. */
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun  { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}

:root[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* No JavaScript, no working button — hide it rather than show a dead control. */
.no-js .theme-toggle { display: none; }

.nav-toggle { display: none; }

.wordmark {
  display: inline-block;
  font-family: var(--serif);
  font-size: var(--wordmark-size);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: .01em;
  color: var(--ink);
  text-decoration: none;
}
.wordmark:hover { color: var(--accent); }

.masthead-nav ul {
  display: flex;
  flex-wrap: wrap;
  margin: .35rem 0 0;
  padding: 0;
  list-style: none;
}
.masthead-nav li { padding: .1rem clamp(.6rem, 2vw, 1.1rem); }
.masthead-nav li:first-child { padding-left: 0; }
.masthead-nav li + li { border-left: 2px dotted var(--rule); }

.masthead-nav a {
  font-family: var(--serif);
  font-size: clamp(.85rem, 2.4vw, 1.0625rem);
  letter-spacing: .01em;
  color: var(--accent);
  text-decoration: none;
  white-space: nowrap;
}
.masthead-nav a:hover { color: var(--ink); }
.masthead-nav a.is-current { color: var(--ink); }

/* --- mobile nav ---------------------------------------------------------- */
/* Must stay AFTER the base .masthead-nav rules above: media queries add no
   specificity, so with equal selectors the later block wins. */

@media (max-width: 36rem) {
  /* Portrait, wordmark and button all centre on one row. The expanded nav is
     taken out of flow (below) so opening it can't change this row's height. */
  .masthead {
    position: relative;
    padding-right: 2.4rem;
    align-items: center;
  }

  /* Wordmark and button become flex siblings so they centre on each other. */
  .masthead-body {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    margin: 0 0 0 1.1rem;
    padding: .2rem .4rem;
    background: none;
    border: 0;
    color: var(--accent);
    cursor: pointer;
  }
  .nav-toggle svg { width: 1.4rem; height: 1.4rem; display: block; }
  .nav-toggle .icon-close { display: none; }
  .nav-toggle[aria-expanded="true"] .icon-bars  { display: none; }
  .nav-toggle[aria-expanded="true"] .icon-close { display: block; }

  /* State lives on the button's aria-expanded — the nav is its next sibling,
     so no extra class is needed and the accessible state can't drift. */
  .masthead-nav { display: none; }
  .nav-toggle[aria-expanded="true"] + .masthead-nav {
    display: block;
    position: absolute;
    top: calc(100% + .6rem);
    left: 0;
    right: 0;
    z-index: 4;
    background: var(--paper);
    border: 1px solid var(--rule);
    border-radius: 2px;
    box-shadow: 0 10px 28px -14px var(--shadow);
    padding: .2rem 1.1rem;
  }

  /* A small notch ties the panel back to the button that opened it. */
  .nav-toggle[aria-expanded="true"] + .masthead-nav::before {
    content: "";
    position: absolute;
    top: -5px;
    left: calc(var(--portrait-size) + 1.6rem);
    width: 8px;
    height: 8px;
    background: var(--paper);
    border-left: 1px solid var(--rule);
    border-top: 1px solid var(--rule);
    transform: rotate(45deg);
  }

  .masthead-nav ul { flex-direction: column; margin: 0; }
  .masthead-nav li,
  .masthead-nav li:first-child { padding: .6rem 0; }
  .masthead-nav li + li { border-left: 0; border-top: 1px solid var(--rule-soft); }

  .masthead-nav a {
    display: block;
    font-size: 1.05rem;
    color: var(--ink);
  }
  .masthead-nav a.is-current {
    color: var(--accent);
    font-style: italic;
  }

  /* Without JS the button can't work, so show the nav and hide the button. */
  .no-js .nav-toggle { display: none; }
  .no-js .masthead-nav { display: block; position: static; width: 100%; }
}

/* --- content ------------------------------------------------------------- */

.content { margin: 0; }

.page-title {
  font-family: var(--serif);
  font-size: 1.75rem;
  font-weight: 400;
  line-height: 1.2;
  margin: 0 0 2rem;
}

/* Markdown `#` headings act as section heads. */
.content h1,
.section-rule {
  font-family: var(--sans);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 3.5rem 0 1.25rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}
.content > h1:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.content h2 {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: 1.2rem;
  letter-spacing: 0;
  color: var(--ink);
  margin: 2.25rem 0 .5rem;
}

.content h3 {
  font-family: var(--sans);
  font-size: .8125rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 1.75rem 0 .5rem;
}

.content p { margin: 0 0 1.15rem; }

.lede {
  font-size: 1.1875rem;
  line-height: 1.65;
  text-wrap: pretty;
  margin-bottom: 1.5rem;
}
.lede::first-letter {
  float: left;
  font-size: 3.4em;
  line-height: .82;
  padding: .04em .1em 0 0;
  color: var(--accent);
}

a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: .18em;
  text-decoration-color: var(--link-rule);
  transition: color .12s ease, text-decoration-color .12s ease;
}
a:hover {
  color: var(--link-hover);
  text-decoration-color: var(--link-hover);
}

.content em { font-style: italic; }
.content strong { font-weight: 600; }

/* Top-level markdown lists read as an index of entries. */
.content ul,
.content ol {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
}

.content > ul:not(.entry-list):not(.social) > li {
  position: relative;
  padding: .7rem 0 .7rem 1.35rem;
  border-bottom: 1px solid var(--rule-soft);
  text-wrap: pretty;
}
.content > ul:not(.entry-list):not(.social) > li:last-child { border-bottom: 0; }
.content > ul:not(.entry-list):not(.social) > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.5rem;
  width: .6rem;
  height: 1px;
  background: var(--accent);
  opacity: .55;
}

/* Nested lists stay quiet. */
.content ul ul,
.content ol ol {
  margin: .5rem 0 0;
}
.content ul ul li {
  padding: .2rem 0 .2rem 1rem;
  border: 0;
  position: relative;
  color: var(--muted);
}
.content ul ul li::before {
  content: "·";
  position: absolute;
  left: .15rem;
  color: var(--muted);
}

.content blockquote {
  margin: 1.5rem 0;
  padding-left: 1.25rem;
  border-left: 2px solid var(--accent);
  font-style: italic;
  color: var(--muted);
}

.content hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 3rem 0;
}

.content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.5rem 0;
  border: 1px solid var(--rule-soft);
}

.content code {
  font-family: var(--mono);
  font-size: .85em;
  background: var(--rule-soft);
  padding: .1em .35em;
  border-radius: 2px;
}
.content pre {
  font-family: var(--mono);
  font-size: .8125rem;
  line-height: 1.55;
  background: var(--rule-soft);
  padding: 1rem 1.15rem;
  overflow-x: auto;
  border-radius: 2px;
}
.content pre code { background: none; padding: 0; }

.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: .9375rem;
}
.content th, .content td {
  text-align: left;
  padding: .55rem .5rem;
  border-bottom: 1px solid var(--rule-soft);
}
.content th {
  font-family: var(--sans);
  font-size: .75rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
}

/* --- title / year entry rows (list pages) -------------------------------- */

.entry-list { list-style: none; margin: 0; padding: 0; }
.entry {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: .8rem 0;
  border-bottom: 1px solid var(--rule-soft);
}
.entry-title { text-decoration-color: var(--link-rule); }
.entry-year {
  font-family: var(--sans);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--muted);
  white-space: nowrap;
}

/* --- elsewhere / colophon ------------------------------------------------ */

.elsewhere { margin-top: 3rem; }

.social,
.content ul.social {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--sans);
  font-size: .8125rem;
  letter-spacing: .03em;
}
.social a { text-decoration-color: var(--link-rule); }

.colophon {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: .5rem 2rem;
  margin-top: clamp(3.5rem, 10vw, 6rem);
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--muted);
}
.colophon p { margin: 0; }
.colophon .social { font-size: .75rem; }

/* --- print --------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

@media print {
  :root { --paper: #fff; --ink: #000; --muted: #444; --accent: #000; }
  .masthead-nav, .skip-link, .elsewhere { display: none; }
  .page { max-width: none; padding: 0; }
  a { text-decoration: none; }
}