/* The rebuilt blog's one stylesheet: black and white, Playfair Display headings
   over Roboto, black category labels, outlined buttons. Dark follows the
   visitor's system setting. */

:root {
  --paper: #ffffff;
  --ink: #111111;
  --muted: #6b6b6b;
  --rule: #e4e4e4;
  --wash: #f4f4f4;
  --label-bg: #111111;
  --label-ink: #ffffff;
  --footer-bg: #111111;
  --footer-ink: #ffffff;
  --serif: "Playfair Display", "Noto Serif TC", "Songti TC", serif;
  --sans: "Roboto", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --wide: 1240px;
  --text: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0d0d0d;
    --ink: #f2f2f2;
    --muted: #a0a0a0;
    --rule: #2a2a2a;
    --wash: #1a1a1a;
    --label-bg: transparent;
    --label-ink: #f2f2f2;
    --footer-bg: #000000;
  }
  .label { border: 1px solid var(--ink); }
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.75 var(--sans);
}

a { color: inherit; }
img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 1.2rem;
}

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

.masthead {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 28px 24px 0;
}

.site-name {
  display: inline-block;
  font: 700 38px/1.1 var(--sans);
  letter-spacing: -0.5px;
  text-decoration: none;
  margin-bottom: 18px;
}

.masthead nav { border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }

.menu, .menu ul { list-style: none; margin: 0; padding: 0; }
.menu { display: flex; flex-wrap: wrap; gap: 4px 28px; }
.menu > li { position: relative; }
.menu a {
  display: block;
  padding: 14px 0;
  font: 500 14px/1.2 var(--sans);
  text-decoration: none;
  border-bottom: 3px solid transparent;
}
.menu a:hover, .menu a[aria-current="page"] { border-bottom-color: var(--ink); }
.has-children > a::after { content: " ▾"; font-size: 11px; }
.has-children ul {
  display: none;
  position: absolute;
  z-index: 10;
  left: -16px;
  min-width: 220px;
  padding: 8px 16px;
  background: var(--paper);
  border: 1px solid var(--rule);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}
.has-children:hover ul, .has-children:focus-within ul { display: block; }
.has-children ul a { padding: 9px 0; border: 0; font-weight: 400; }
.has-children ul a:hover { text-decoration: underline; }

/* --- page and listing headers -------------------------------------------- */

main { max-width: var(--wide); margin: 0 auto; padding: 0 24px; }

.page-header { padding: 56px 0 8px; }
.page-header h1 { font-size: clamp(34px, 5vw, 54px); margin: 0; }

/* --- labels and buttons ---------------------------------------------------- */

.labels { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 18px; }
.label {
  display: inline-block;
  padding: 7px 12px;
  background: var(--label-bg);
  color: var(--label-ink);
  font: 700 12px/1 var(--sans);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  text-decoration: none;
}
.label:hover { opacity: 0.8; }

.button {
  display: inline-block;
  padding: 18px 46px;
  border: 2px solid var(--ink);
  font: 700 13px/1 var(--sans);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}
.button:hover { background: var(--ink); color: var(--paper); }

.byline {
  margin: 0;
  color: var(--muted);
  font: 700 12px/1.4 var(--sans);
  letter-spacing: 3px;
  text-transform: uppercase;
}
.byline span::before { content: "—"; margin: 0 14px; }

/* --- cards ------------------------------------------------------------------ */

.cards { padding: 40px 0 24px; }

.card {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 48px;
  align-items: center;
  padding: 44px 0;
}
.card + .card { border-top: 1px solid var(--rule); }

.card-title {
  font-size: clamp(28px, 3.6vw, 46px);
  margin: 0 0 22px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--rule);
}
.card-title a { text-decoration: none; }
.card-title a:hover { text-decoration: underline; text-decoration-thickness: 2px; }
.excerpt { margin: 0 0 30px; }

.card-media { display: flex; gap: 20px; align-items: stretch; }
.card-image {
  flex: 1;
  display: block;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--wash);
}
.card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s; }
.card-image:hover img { transform: scale(1.04); }
.card-media .byline { writing-mode: vertical-rl; white-space: nowrap; }

.card-flip .card-text { order: 2; }
.card-flip { grid-template-columns: 7fr 5fr; }

/* --- a post ----------------------------------------------------------------- */

.post { padding: 56px 0 24px; }
.post-header { max-width: var(--text); margin: 0 auto 36px; }
.post-header h1 { font-size: clamp(32px, 5vw, 56px); margin-bottom: 22px; }

.lead-image { max-width: 1040px; margin: 0 auto 44px; }
.lead-image img { width: 100%; }

.prose { max-width: var(--text); margin: 0 auto; overflow-wrap: anywhere; }
.prose h2 { font-size: 30px; margin-top: 2.4rem; }
.prose h3 { font-size: 24px; margin-top: 2rem; }
.prose p, .prose ul, .prose ol, .prose blockquote, .prose figure, .prose table, .prose pre { margin: 0 0 1.5rem; }
.prose figure { margin-left: 0; margin-right: 0; }
.prose img { margin: 0 auto; }
.prose figcaption { color: var(--muted); font-size: 14px; text-align: center; margin-top: 8px; }
.prose blockquote {
  margin-left: 0;
  padding: 4px 0 4px 24px;
  border-left: 4px solid var(--ink);
  font-family: var(--serif);
  font-size: 21px;
}
.prose a { text-decoration-thickness: 1px; text-underline-offset: 3px; }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }
.prose table { border-collapse: collapse; width: 100%; }
.prose th, .prose td { border: 1px solid var(--rule); padding: 8px 12px; }
.prose pre { background: var(--wash); padding: 16px; overflow-x: auto; }

.prose .float-right { float: right; max-width: 45%; margin: 0 0 1rem 2rem; }
.prose .float-left { float: left; max-width: 45%; margin: 0 2rem 1rem 0; }
.prose::after { content: ""; display: block; clear: both; }

.prose .embed iframe { display: block; width: 100%; max-width: 100%; border: 0; }

.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.gallery figure { margin: 0; }
.gallery img { width: 100%; height: 100%; object-fit: cover; }
.gallery:has(> figure:only-child) { grid-template-columns: 1fr; max-width: 560px; margin-left: auto; margin-right: auto; }

.page { padding: 32px 0 48px; }
.home-more { text-align: center; margin: 0 0 72px; }

.tags { max-width: var(--text); margin: 36px auto 0; display: flex; flex-wrap: wrap; gap: 8px 18px; }
.tags a { color: var(--muted); font-size: 14px; text-decoration: none; }
.tags a:hover { color: var(--ink); }

.post-nav {
  max-width: var(--text);
  margin: 40px auto 72px;
  padding-top: 28px;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.post-nav a { text-decoration: none; font: 700 19px/1.35 var(--serif); }
.post-nav a span { display: block; margin-bottom: 8px; color: var(--muted); font: 700 12px/1 var(--sans); letter-spacing: 2px; text-transform: uppercase; }
.post-nav a[rel="next"] { text-align: right; grid-column: 2; }
.post-nav a:hover { text-decoration: underline; }

/* --- footer ----------------------------------------------------------------- */

.site-footer {
  background: var(--footer-bg);
  color: var(--footer-ink);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 32px;
  padding: 28px max(24px, calc((100vw - var(--wide)) / 2 + 24px));
  font-size: 14px;
}
.site-footer p { margin: 0; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

/* --- small screens ------------------------------------------------------------ */

@media (max-width: 820px) {
  body { font-size: 16px; }
  .site-name { font-size: 30px; }
  .menu { gap: 2px 20px; }
  .card, .card-flip { grid-template-columns: 1fr; gap: 24px; padding: 32px 0; }
  .card-flip .card-text { order: 0; }
  .card-media { order: -1; flex-direction: column; }
  .card-media .byline { writing-mode: horizontal-tb; }
  .prose .float-right, .prose .float-left { float: none; max-width: 100%; margin: 0 0 1.5rem; }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav a[rel="next"] { grid-column: 1; text-align: left; }
  .has-children ul { position: static; display: block; border: 0; box-shadow: none; padding: 0 0 8px 12px; }
}