/* ============================================================
   STELLA MD — public stylesheet
   白い紙の上の、静かな星空。
   ============================================================ */

:root {
  --paper:   #fbfbfd;
  --surface: #ffffff;
  --ink:     #1a1d26;
  --ink-2:   #5d6272;
  --ink-3:   #9297a8;
  --line:    #e7e9f0;
  --accent:  #3d4ed8;
  --accent-ink: #32409f;
  --accent-soft: rgba(61, 78, 216, .07);
  --gold:    #b8912e;
  --shadow:  0 1px 2px rgba(20, 24, 46, .04), 0 8px 28px rgba(20, 24, 46, .06);
  --shadow-lift: 0 2px 6px rgba(20, 24, 46, .06), 0 16px 44px rgba(20, 24, 46, .10);
  --radius: 14px;
  --font-display: "Shippori Mincho", "Hiragino Mincho ProN", serif;
  --font-body: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --star-opacity: .5;
  color-scheme: light;
}

html[data-theme="dark"] {
  --paper:   #0b0d15;
  --surface: #12141f;
  --ink:     #e9ebf4;
  --ink-2:   #a2a8bc;
  --ink-3:   #6d7288;
  --line:    #232738;
  --accent:  #97a2ff;
  --accent-ink: #b4bcff;
  --accent-soft: rgba(151, 162, 255, .09);
  --gold:    #d9b657;
  --shadow:  0 1px 2px rgba(0, 0, 0, .3), 0 8px 28px rgba(0, 0, 0, .35);
  --shadow-lift: 0 2px 6px rgba(0, 0, 0, .4), 0 16px 44px rgba(0, 0, 0, .5);
  --star-opacity: .9;
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  html[data-theme="auto"] {
    --paper:   #0b0d15;
    --surface: #12141f;
    --ink:     #e9ebf4;
    --ink-2:   #a2a8bc;
    --ink-3:   #6d7288;
    --line:    #232738;
    --accent:  #97a2ff;
    --accent-ink: #b4bcff;
    --accent-soft: rgba(151, 162, 255, .09);
    --gold:    #d9b657;
    --shadow:  0 1px 2px rgba(0, 0, 0, .3), 0 8px 28px rgba(0, 0, 0, .35);
    --shadow-lift: 0 2px 6px rgba(0, 0, 0, .4), 0 16px 44px rgba(0, 0, 0, .5);
    --star-opacity: .9;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.9;
  letter-spacing: .015em;
  -webkit-font-smoothing: antialiased;
  transition: background-color .35s ease, color .35s ease;
}

#stars {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: var(--star-opacity);
  transition: opacity .5s ease;
}

a { color: var(--accent-ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

/* ------------------------------------------------ shell layout */
.shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  max-width: 1180px;
  margin: 0 auto;
  min-height: 100vh;
  gap: 0 48px;
  padding: 0 32px;
}

.main {
  max-width: 720px;
  width: 100%;
  padding: 56px 0 40px;
  margin: 0 auto;
}

/* ------------------------------------------------ topbar (mobile) */
.topbar {
  display: none;
  position: sticky;
  top: 0;
  z-index: 40;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.topbar-title {
  flex: 1;
  text-align: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  color: var(--ink);
  letter-spacing: .06em;
}
.topbar-title:hover { text-decoration: none; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px; height: 38px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink-2);
  cursor: pointer;
  transition: color .2s, border-color .2s, transform .15s;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); }
.icon-btn:active { transform: scale(.94); }

html[data-theme="dark"] .ic-sun,
html[data-theme="auto"] .ic-sun { display: none; }
html[data-theme="dark"] .ic-moon { display: block; }
.ic-moon { display: none; }
html[data-theme="light"] .ic-sun { display: block; }
html[data-theme="light"] .ic-moon { display: none; }
@media (prefers-color-scheme: dark) {
  html[data-theme="auto"] .ic-sun { display: none; }
  html[data-theme="auto"] .ic-moon { display: block; }
}
@media (prefers-color-scheme: light) {
  html[data-theme="auto"] .ic-sun { display: block; }
  html[data-theme="auto"] .ic-moon { display: none; }
}

/* ------------------------------------------------ sidebar */
.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
  padding: 56px 4px 32px 0;
  scrollbar-width: thin;
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand-mark {
  color: var(--gold);
  font-size: 15px;
  animation: twinkle 3.4s ease-in-out infinite;
}
@keyframes twinkle {
  0%, 100% { opacity: 1; }
  50% { opacity: .35; }
}
.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  letter-spacing: .08em;
}
.brand-desc {
  margin: 10px 0 0;
  font-size: 12.5px;
  color: var(--ink-2);
  line-height: 1.8;
}

.side-search {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  overflow: hidden;
  transition: border-color .2s, box-shadow .2s;
}
.side-search:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.side-search input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  padding: 9px 12px;
  font: inherit;
  font-size: 13.5px;
  color: var(--ink);
}
.side-search input:focus { outline: none; }
.side-search button {
  border: 0;
  background: transparent;
  color: var(--ink-3);
  padding: 0 12px;
  cursor: pointer;
}
.side-search button:hover { color: var(--accent); }

.side-label {
  margin: 0 0 12px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .22em;
  color: var(--ink-3);
  text-transform: uppercase;
}
.side-label::after {
  content: "";
  display: block;
  width: 28px;
  height: 1px;
  margin-top: 8px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.side-posts { list-style: none; margin: 0; padding: 0; }
.side-posts li + li { margin-top: 2px; }
.side-posts a {
  display: block;
  padding: 8px 10px;
  border-radius: 9px;
  color: var(--ink-2);
  transition: background .2s, color .2s;
}
.side-posts a:hover { background: var(--accent-soft); color: var(--ink); text-decoration: none; }
.side-posts a[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--accent-ink);
}
.sp-title {
  display: block;
  font-size: 13.5px;
  font-weight: 500;
  line-height: 1.55;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.sp-date { display: block; font-size: 11px; color: var(--ink-3); margin-top: 2px; font-family: var(--font-mono); }
.side-empty { font-size: 13px; color: var(--ink-3); padding: 4px 10px; }

.tagcloud { display: flex; flex-wrap: wrap; gap: 7px; }
.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  padding: 4px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-2);
  background: var(--surface);
  transition: all .2s;
}
.tag span { font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-3); }
.tag:hover, .tag.is-active {
  border-color: var(--accent);
  color: var(--accent-ink);
  background: var(--accent-soft);
  text-decoration: none;
}

.side-foot {
  margin-top: auto;
  font-size: 12px;
  color: var(--ink-3);
  display: flex;
  gap: 8px;
  align-items: center;
}
.side-link { color: var(--ink-3); }
.side-link:hover { color: var(--accent); }

.scrim {
  position: fixed;
  inset: 0;
  z-index: 45;
  background: rgba(10, 12, 22, .45);
  backdrop-filter: blur(2px);
  opacity: 0;
  transition: opacity .25s;
}
.scrim.show { opacity: 1; }

/* ------------------------------------------------ hero & listing */
.hero {
  padding: 40px 0 56px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 44px;
}
.hero-eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--gold);
}
.hero-eyebrow::before { content: "✦ "; }
.hero-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 5.5vw, 52px);
  letter-spacing: .04em;
  line-height: 1.25;
}
.hero-desc { margin: 18px 0 0; color: var(--ink-2); max-width: 44em; }
.hero .btn { margin-top: 24px; }

.listing-head { margin-bottom: 36px; }
.listing-head h1 {
  font-family: var(--font-display);
  font-size: 30px;
  margin: 0;
  letter-spacing: .04em;
}
.listing-head p { color: var(--ink-3); font-size: 13px; margin: 8px 0 0; }

.cards { display: flex; flex-direction: column; gap: 20px; }
.card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px;
  color: var(--ink);
  box-shadow: var(--shadow);
  transition: transform .25s cubic-bezier(.2, .7, .3, 1), box-shadow .25s, border-color .25s;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
  text-decoration: none;
}
.card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-3);
}
.card-title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: .03em;
  line-height: 1.5;
}
.card:hover .card-title { color: var(--accent-ink); }
.card-excerpt {
  margin: 0;
  font-size: 13.5px;
  color: var(--ink-2);
  line-height: 1.85;
}
.card-tags {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--ink-3);
}
.pin-badge { color: var(--gold); font-size: 12px; letter-spacing: .05em; }
.draft-badge {
  display: inline-block;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--gold);
  color: #fff;
  margin-bottom: 12px;
}
.empty { color: var(--ink-3); text-align: center; padding: 56px 0; }

.pager {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 22px;
  margin-top: 44px;
  font-size: 13.5px;
}
.pager span { color: var(--ink-3); font-family: var(--font-mono); font-size: 12px; }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 10px 24px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  transition: opacity .2s, transform .15s;
}
.btn:hover { opacity: .88; text-decoration: none; transform: translateY(-1px); }
html[data-theme="dark"] .btn { color: #0b0d15; }
@media (prefers-color-scheme: dark) {
  html[data-theme="auto"] .btn { color: #0b0d15; }
}

/* ------------------------------------------------ article */
.article-head { padding-bottom: 28px; border-bottom: 1px solid var(--line); margin-bottom: 32px; }
.article-title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4.4vw, 38px);
  line-height: 1.45;
  letter-spacing: .03em;
}
.article-meta {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-3);
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.meta-sep { color: var(--line); }
.article-tags { margin-top: 14px; display: flex; gap: 8px; flex-wrap: wrap; }

.toc {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: 12px;
  padding: 18px 22px;
  margin-bottom: 36px;
  font-size: 13.5px;
  box-shadow: var(--shadow);
}
.toc-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--ink-3);
  margin-bottom: 8px;
}
.toc ol { margin: 0; padding: 0; list-style: none; }
.toc li { line-height: 2.1; }
.toc li.toc-l3 { padding-left: 18px; font-size: 12.5px; }
.toc a { color: var(--ink-2); }
.toc a:hover { color: var(--accent-ink); }

/* prose = rendered markdown */
.prose { font-size: 15.5px; }
.prose > :first-child { margin-top: 0; }
.prose h1, .prose h2, .prose h3, .prose h4 {
  font-family: var(--font-display);
  letter-spacing: .03em;
  line-height: 1.5;
  scroll-margin-top: 80px;
}
.prose h1 { font-size: 27px; margin: 2.2em 0 .8em; }
.prose h2 {
  font-size: 23px;
  margin: 2.4em 0 .9em;
  padding-bottom: .4em;
  border-bottom: 1px solid var(--line);
  position: relative;
}
.prose h2::after {
  content: "";
  position: absolute;
  left: 0; bottom: -1px;
  width: 44px; height: 1px;
  background: var(--gold);
}
.prose h3 { font-size: 18.5px; margin: 2em 0 .7em; }
.prose h4 { font-size: 16px; margin: 1.8em 0 .6em; }
.prose p { margin: 1.2em 0; }
.prose a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent); }
.prose img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: var(--shadow);
  display: block;
  margin: 1.6em auto;
}
.prose blockquote {
  margin: 1.6em 0;
  padding: 4px 22px;
  border-left: 3px solid var(--gold);
  background: var(--accent-soft);
  border-radius: 0 10px 10px 0;
  color: var(--ink-2);
}
.prose ul, .prose ol { padding-left: 1.6em; margin: 1.2em 0; }
.prose li { margin: .35em 0; }
.prose li::marker { color: var(--gold); }
.prose hr {
  border: 0;
  margin: 3em 0;
  text-align: center;
  height: auto;
}
.prose hr::after {
  content: "✦ ✦ ✦";
  color: var(--ink-3);
  font-size: 11px;
  letter-spacing: 1.4em;
  padding-left: 1.4em;
}
.prose code {
  font-family: var(--font-mono);
  font-size: .84em;
  background: var(--accent-soft);
  color: var(--accent-ink);
  border-radius: 6px;
  padding: .18em .5em;
}
.prose pre {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  overflow-x: auto;
  box-shadow: var(--shadow);
  margin: 1.6em 0;
}
.prose pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: 13px;
  line-height: 1.75;
}
.copy-code {
  position: absolute;
  top: 8px; right: 8px;
  font-size: 11px;
  font-family: var(--font-body);
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink-3);
  border-radius: 7px;
  padding: 4px 10px;
  cursor: pointer;
  opacity: 0;
  transition: opacity .2s, color .2s;
}
.prose pre:hover .copy-code { opacity: 1; }
.copy-code:hover { color: var(--accent); }
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.6em 0;
  font-size: 13.5px;
  display: block;
  overflow-x: auto;
}
.prose th, .prose td {
  border: 1px solid var(--line);
  padding: 9px 14px;
  text-align: left;
}
.prose th { background: var(--accent-soft); font-weight: 700; }

.article-foot { margin-top: 56px; }
.pn { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.pn-item {
  display: block;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  padding: 14px 18px;
  color: var(--ink);
  transition: border-color .2s, transform .2s;
}
.pn-item:hover { border-color: var(--accent); text-decoration: none; transform: translateY(-2px); }
.pn-item span { display: block; font-size: 11px; color: var(--ink-3); font-family: var(--font-mono); }
.pn-item strong { display: block; font-size: 13.5px; margin-top: 5px; font-weight: 500; line-height: 1.6; }
.pn-next { text-align: right; }

/* ------------------------------------------------ footer & misc */
.site-foot {
  margin-top: 72px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-3);
  display: flex;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}
.site-foot p { margin: 0; }
.powered { letter-spacing: .1em; }

.to-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 30;
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-2);
  cursor: pointer;
  box-shadow: var(--shadow);
  font-size: 16px;
  transition: transform .2s, color .2s;
}
.to-top:hover { transform: translateY(-3px); color: var(--accent); }

/* ------------------------------------------------ responsive: mobile */
@media (max-width: 900px) {
  .topbar { display: flex; }
  .shell {
    grid-template-columns: 1fr;
    padding: 0 20px;
    gap: 0;
  }
  .main { padding-top: 30px; }
  .sidebar {
    position: fixed;
    z-index: 50;
    top: 0; left: 0;
    height: 100dvh;
    width: min(310px, 84vw);
    background: var(--paper);
    border-right: 1px solid var(--line);
    padding: 26px 22px;
    transform: translateX(-104%);
    transition: transform .3s cubic-bezier(.2, .8, .3, 1);
    box-shadow: none;
  }
  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-lift);
  }
  .hero { padding: 22px 0 38px; }
  .card { padding: 20px; }
  .pn { grid-template-columns: 1fr; }
  .pn-next { text-align: left; }
  .to-top { right: 16px; bottom: 16px; }
}