/* ============================================================
   研究ノート — inai17ibar.github.io
   paper / ink / blue-ink / rule / marker
   ============================================================ */

:root {
  --paper: #FAFAF8;
  --ink: #23262D;
  --ink-blue: #2C55A0;
  --pencil: #6B6E76;
  --rule: #DBDED8;
  --marker: #F6E9A3;

  --font-display: "Shippori Mincho B1", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-body: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --font-mono: "IBM Plex Mono", "Menlo", "Consolas", monospace;

  --gutter: 120px;   /* notebook margin rail (desktop) */
  --tick: 44px;      /* section tab crossing the rail   */
  --content-pad: 44px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.95;
  letter-spacing: 0.015em;
  -webkit-font-smoothing: antialiased;
}

.sheet {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 28px 64px;
}

/* ---- header / wordmark ---- */

.site-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 24px;
  padding: 30px 0 18px;
  border-bottom: 2px solid var(--rule);
}

.wordmark {
  text-decoration: none;
  color: var(--ink);
}

.wordmark .wordmark-ja {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: 0.08em;
}

.wordmark .wordmark-en {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--pencil);
  margin-left: 12px;
}

.site-nav {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}

.site-nav a {
  color: var(--pencil);
  text-decoration: none;
  margin-left: 20px;
  padding-bottom: 3px;
}

.site-nav a:first-child { margin-left: 0; }

.site-nav a:hover { color: var(--ink-blue); }

.site-nav a[aria-current="page"] {
  color: var(--ink-blue);
  border-bottom: 2px solid var(--ink-blue);
}

/* ---- the notebook margin rail ---- */

main {
  position: relative;
  margin: 0 0 0 var(--gutter);
  padding: 44px 0 24px var(--content-pad);
  border-left: 2px solid var(--rule);
  min-height: 40vh;
}

/* ---- type ---- */

h1, .hero-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-feature-settings: "palt";
  letter-spacing: 0.03em;
  line-height: 1.5;
}

h1 {
  font-size: 1.85rem;
  margin: 0 0 0.6em;
}

/* section heads become specimen labels; a blue tab crosses the rail */
h2 {
  position: relative;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--ink-blue);
  margin: 3.2em 0 1em;
}

h2::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--content-pad) - var(--tick) / 2 - 1px);
  top: 0.75em;
  width: var(--tick);
  height: 2px;
  background: var(--ink-blue);
}

h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 2em 0 0.5em;
}

/* CV project titles */
h4 {
  font-size: 1rem;
  font-weight: 700;
  margin: 1.8em 0 0.4em;
}

h4::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 2px;
  background: var(--ink-blue);
  vertical-align: middle;
  margin-right: 9px;
}

p { margin: 0 0 1.2em; }

ul { padding-left: 1.3em; margin: 0 0 1.4em; }
li { margin-bottom: 0.45em; }
li::marker { color: var(--ink-blue); }

a {
  color: var(--ink-blue);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover { text-decoration-thickness: 2px; }

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

strong { font-weight: 700; }

em { font-style: normal; font-weight: 500; }

hr {
  border: 0;
  width: 56px;
  height: 2px;
  background: var(--rule);
  margin: 3em 0;
}

blockquote {
  margin: 1.6em 0;
  padding-left: 1.2em;
  border-left: 3px solid var(--marker);
  color: var(--pencil);
}

code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: #F0F0EB;
  padding: 0.1em 0.4em;
  border-radius: 3px;
}

pre {
  background: #F0F0EB;
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 16px 20px;
  overflow-x: auto;
  line-height: 1.6;
}

pre code { background: none; padding: 0; }

img { max-width: 100%; height: auto; }

.bio-photo {
  float: right;
  width: 148px;
  margin: 6px 0 20px 28px;
  border: 1px solid var(--rule);
  border-radius: 4px;
}

@media (max-width: 720px) {
  .bio-photo { width: 108px; margin-left: 18px; }
}

/* ---- figures ---- */

figure { margin: 2.4em 0; }

figure img {
  display: block;
  border: 1px solid var(--rule);
  border-radius: 5px;
}

/* phone-sized UI captures stay small so they don't swallow the column */
figure.shot img { max-width: 340px; }

figcaption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.9;
  color: var(--pencil);
  max-width: 34em;
  margin-top: 0.8em;
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 0 0 1.6em;
  font-size: 0.92rem;
}

th, td {
  text-align: left;
  padding: 8px 14px 8px 0;
  border-bottom: 1px solid var(--rule);
}

th {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--pencil);
  font-weight: 500;
}

/* ---- hero (home) ---- */

.hero { padding: 12px 0 8px; }

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--pencil);
  margin: 0 0 1.6em;
}

.hero-title {
  font-size: clamp(1.9rem, 5vw, 2.9rem);
  margin: 0 0 0.7em;
}

.marker {
  background-image: linear-gradient(transparent 58%, var(--marker) 58%, var(--marker) 94%, transparent 94%);
  background-repeat: no-repeat;
  background-size: 100% 100%;
}

@media (prefers-reduced-motion: no-preference) {
  .marker {
    background-size: 0% 100%;
    animation: marker-swipe 0.7s ease-out 0.4s forwards;
  }
  @keyframes marker-swipe {
    to { background-size: 100% 100%; }
  }
}

.hero-lead {
  max-width: 40em;
  margin-bottom: 2em;
}

.hero-links {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  padding: 0;
  margin: 0 0 1em;
  list-style: none;
}

.hero-links a { text-decoration: none; }
.hero-links a:hover { text-decoration: underline; text-underline-offset: 4px; }
.hero-links a::before { content: "→ "; color: var(--pencil); }

/* ---- log rows (now / posts) ---- */

.log { list-style: none; padding: 0; margin: 0 0 1.4em; }

.log li {
  display: flex;
  gap: 20px;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
  margin: 0;
}

.log li:last-child { border-bottom: none; }

.log .log-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--pencil);
  flex: 0 0 5.4em;
  padding-top: 0.25em;
}

.post-list { list-style: none; padding: 0; margin: 0; }

.post-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
  margin: 0;
}

.post-list li:last-child { border-bottom: none; }

.post-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--pencil);
  display: block;
  margin-bottom: 2px;
}

.post-list h3 { margin: 0 0 0.2em; font-size: 1rem; }

.post-list .post-link { text-decoration: none; color: var(--ink); }
.post-list .post-link:hover { color: var(--ink-blue); }

.post-list p { color: var(--pencil); font-size: 0.9rem; margin: 0; line-height: 1.7; }

/* ---- page / post header ---- */

.page-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--pencil);
  margin: 0 0 2em;
}

.post-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--pencil);
}

.tags { margin-top: 3em; }

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--pencil);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 2px 8px;
  margin: 2px 6px 2px 0;
}

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

.site-foot {
  margin-left: var(--gutter);
  padding: 20px 0 0 var(--content-pad);
  border-left: 2px solid var(--rule);
  border-top: none;
}

.site-foot p {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--pencil);
  margin: 0;
}

/* ---- mobile: the rail narrows but stays ---- */

@media (max-width: 720px) {
  :root {
    --gutter: 0px;
    --content-pad: 20px;
    --tick: 14px;
  }

  body { font-size: 0.96rem; }

  .sheet { padding: 0 18px 48px; }

  .site-head { padding-top: 22px; }

  .site-nav { width: 100%; }
  .site-nav a { margin-left: 0; margin-right: 18px; }

  main { padding-top: 32px; }

  h2::before { left: calc(-1 * var(--content-pad) - var(--tick) / 2 - 1px); }

  .log li { gap: 14px; }
}