/* ---------------------------------------------
   Marina Ogawa — essays
   紙:  #FBFAF6   墨:  #2E2B26   薄墨: #8F8A80
   水:  #6E8CA0  (リンクとカテゴリーにだけ)
   --------------------------------------------- */

:root {
  --paper: #FBFAF6;
  --ink: #2E2B26;
  --faded: #8F8A80;
  --water: #6E8CA0;
  --rule: rgba(46, 43, 38, 0.14);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1E1C19;
    --ink: #D9D4CA;
    --faded: #8A8478;
    --water: #8FA9BC;
    --rule: rgba(217, 212, 202, 0.16);
  }
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { background: var(--paper); }

body {
  font-family: "Noto Serif JP", "Yu Mincho", "YuMincho", "Hiragino Mincho ProN",
    "BIZ UDMincho", serif;
  font-size: 17px;
  line-height: 2;
  color: var(--ink);
  background: var(--paper);
  max-width: 34rem;
  margin: 0 auto;
  padding: 12vh 1.5rem 18vh;
  text-rendering: optimizeLegibility;
  animation: appear 1.2s ease-out both;
}

@keyframes appear { from { opacity: 0; } to { opacity: 1; } }

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

/* ---- ヘッダー ---- */

header.site {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 4.5rem;
}

.site-title {
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.14em;
}

.site-title a { color: var(--ink); text-decoration: none; }

.site-nav { display: flex; gap: 1.25rem; }

.site-nav a {
  font-size: 0.85rem;
  color: var(--faded);
  text-decoration: none;
  letter-spacing: 0.05em;
  transition: color 0.3s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible { color: var(--water); }

.site-nav a[aria-current="page"] { color: var(--ink); }

/* ---- カテゴリー絞り込み ---- */

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--rule);
}

.filters button {
  font-family: inherit;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  color: var(--faded);
  border-bottom: 1px solid transparent;
  transition: color 0.3s ease, border-color 0.3s ease;
}

.filters button:hover,
.filters button:focus-visible { color: var(--water); }

.filters button[aria-pressed="true"] {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ---- 一覧 ---- */

ul.essays { list-style: none; }

ul.essays li {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.55rem 0;
}

ul.essays li[hidden] { display: none; }

ul.essays time {
  flex: none;
  font-size: 0.8rem;
  color: var(--faded);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

ul.essays a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, color 0.3s ease;
}

ul.essays a:hover,
ul.essays a:focus-visible {
  color: var(--water);
  border-bottom-color: var(--water);
}

.tag {
  flex: none;
  margin-left: auto;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--water);
}

.empty { color: var(--faded); font-size: 0.9rem; }
.empty[hidden] { display: none; }

/* ---- 本文 ---- */

article h1 {
  font-size: 1.35rem;
  font-weight: 500;
  line-height: 1.8;
  letter-spacing: 0.04em;
  margin-bottom: 0.6rem;
}

article h2 {
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  margin: 3rem 0 1.25rem;
}

article .meta {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--faded);
  letter-spacing: 0.06em;
  margin-bottom: 3.5rem;
}

article .meta .tag { margin-left: 0; }

article p { margin-bottom: 1.75rem; }

article a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 0.25em;
  transition: color 0.3s ease, text-decoration-color 0.3s ease;
}

article a:hover,
article a:focus-visible {
  color: var(--water);
  text-decoration-color: var(--water);
}

.asterism {
  text-align: center;
  color: var(--faded);
  margin: 3rem 0;
  letter-spacing: 1em;
  text-indent: 1em;
  user-select: none;
}

/* ---- 足元 ---- */

footer {
  margin-top: 7rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
  font-size: 0.8rem;
  color: var(--faded);
  letter-spacing: 0.06em;
}

footer a {
  color: var(--faded);
  text-decoration: none;
  transition: color 0.3s ease;
}

footer a:hover, footer a:focus-visible { color: var(--water); }

/* ---- 小さな画面 ---- */

@media (max-width: 480px) {
  body { font-size: 16px; padding-top: 8vh; }

  header.site { margin-bottom: 3rem; }

  ul.essays li {
    flex-wrap: wrap;
    gap: 0.15rem 1rem;
    padding: 0.8rem 0;
  }

  ul.essays a { flex-basis: 100%; order: 3; }
  .tag { margin-left: 0; }
}