/*
Theme Name: Kiichiro Okubo Lab
Theme URI: https://kiichiro-okubo-lab.net/
Author: Kiichiro Okubo Lab
Description: 大久保紀一朗研究室サイト用クラシックテーマ。教育工学・メディア教育の研究室紹介サイトのためのデザインを再現しています。
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: ok-lab
*/

:root{
  --ink:#141414;
  --paper:#FBFBF9;
  --gray:#767672;
  --line:#DBDBD6;
  --accent:#2F6F4F;
  --max:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto} *{animation:none!important;transition:none!important}}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:'Noto Sans JP',sans-serif;
  font-size:16px;
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.en{font-family:'Inter',sans-serif;letter-spacing:.02em}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* ---------- header ---------- */
header{
  position:fixed;top:0;left:0;right:0;z-index:50;
  transition:background .3s,border-color .3s,color .3s;
  color:#fff;border-bottom:1px solid transparent;
}
header.solid{
  background:rgba(251,251,249,.94);backdrop-filter:blur(8px);
  color:var(--ink);border-bottom:1px solid var(--line);
}
.head-in{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{font-family:'Zen Kaku Gothic New',sans-serif;font-weight:900;font-size:17px;letter-spacing:.06em}
.brand small{display:block;font-family:'Inter',sans-serif;font-weight:400;font-size:11px;letter-spacing:.14em;opacity:.75;line-height:1.3}
nav{display:flex;gap:28px;align-items:center}
nav ul{display:flex;gap:28px;align-items:center;list-style:none}
nav a{font-size:14px;font-weight:500;letter-spacing:.04em;position:relative;padding:4px 0}
nav a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:1px;background:currentColor;transition:width .25s}
nav a:hover::after,nav a:focus-visible::after{width:100%}
/* English link: same nav-item tone (inherits nav a's size/weight/underline), just muted */
.lang-en{opacity:.7}
.lang-en:hover{opacity:1}
.menu-btn{display:none}

/* ---------- hero ---------- */
.hero{
  position:relative;
  min-height:100svh;
  display:flex;align-items:flex-end;
  color:#fff;
  isolation:isolate;
}
.hero .bg{
  position:absolute;inset:0;z-index:-2;
  background:center/cover no-repeat #141414;
}
.hero::after{
  content:"";position:absolute;inset:0;z-index:-1;
  background:linear-gradient(to top, rgba(10,10,10,.66) 0%, rgba(10,10,10,.2) 48%, rgba(10,10,10,.3) 100%);
}
.hero-in{padding:0 0 88px}
.hero .label{font-family:'Inter',sans-serif;font-size:12px;letter-spacing:.22em;text-transform:uppercase;margin-bottom:24px;opacity:.9}
h1{
  font-family:'Zen Kaku Gothic New',sans-serif;
  font-weight:900;
  font-size:clamp(34px,5.8vw,76px);
  line-height:1.3;
  letter-spacing:.01em;
  max-width:20em;
  text-shadow:0 1px 24px rgba(0,0,0,.3);
}
h1 .tone-word{position:relative;display:inline-block}
h1 .tone-word::before{
  content:"";position:absolute;inset:-4px -6px;z-index:-1;
  background-image:radial-gradient(rgba(255,255,255,.5) 1.6px, transparent 1.6px);
  background-size:9px 9px;
}
.hero p.lead{margin-top:28px;max-width:36em;font-size:16.5px;opacity:.95;text-shadow:0 1px 12px rgba(0,0,0,.4)}
.hero .cta{margin-top:36px;display:inline-flex;align-items:center;gap:10px;font-size:14px;font-weight:500;border:1px solid #fff;padding:10px 22px;border-radius:999px;transition:background .2s,color .2s}
.hero .cta:hover{background:#fff;color:var(--ink)}
.scroll-cue{
  position:absolute;right:24px;bottom:32px;
  font-family:'Inter',sans-serif;font-size:11px;letter-spacing:.24em;text-transform:uppercase;
  writing-mode:vertical-rl;opacity:.8;
}

/* ---------- section shell ---------- */
section{border-bottom:1px solid var(--line);padding:72px 0}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:44px}
.sec-head h2{font-family:'Inter',sans-serif;font-weight:500;font-size:15px;letter-spacing:.18em;text-transform:uppercase;color:var(--gray)}
.sec-head a{font-size:13px;color:var(--gray)}
.sec-head a:hover{color:var(--ink)}

/* ---------- research ---------- */
.research-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--line)}
.r-item{border-bottom:1px solid var(--line);padding:36px 28px 40px;transition:background .25s}
.r-item:not(:last-child){border-right:1px solid var(--line)}
.r-item:hover{background:#F3F3EF}
.r-item .tag{font-family:'Inter',sans-serif;font-size:11px;letter-spacing:.18em;color:var(--accent);text-transform:uppercase}
.r-item h3{font-family:'Zen Kaku Gothic New',sans-serif;font-weight:700;font-size:22px;line-height:1.5;margin:14px 0 12px}
.r-item p{font-size:14.5px;color:#4a4a47}

/* ---------- 図版帯：研究図を白地で大きく見せる ---------- */
.figure-band{
  background:
    radial-gradient(var(--line) 1.4px, transparent 1.4px) 0 0/12px 12px,
    #F3F3EF;
  border-bottom:1px solid var(--line);
  padding:80px 0;
  text-align:center;
}
.figure-band h2{
  font-family:'Zen Kaku Gothic New',sans-serif;font-weight:700;
  font-size:clamp(21px,2.8vw,30px);line-height:1.7;margin-bottom:40px;
}
.figure-band .fig-card{
  background:#fff;border:1px solid var(--line);
  max-width:1000px;margin:0 auto;padding:36px 32px 24px;
}
/* fixed image box (not max-height) so every slide's figure occupies the same
   vertical space -- this, not JS height math, is what keeps the band from
   jumping when the carousel crossfades between differently-shaped figures. */
.figure-band img{width:100%;height:420px;object-fit:contain;object-position:center;display:block}
/* caption area always reserves 2 lines' worth of height (short 1-line
   captions just leave the 2nd line blank) so switching between a short and
   a long citation can't change the card's height either. */
.figure-band figcaption{
  font-family:'Inter',sans-serif;font-size:12px;letter-spacing:.12em;color:var(--gray);
  text-transform:uppercase;margin-top:18px;
  line-height:1.6em;height:3.2em;overflow:hidden;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;
}

/* ---------- figure-band carousel (注目研究) ---------- */
.fig-carousel{display:grid;max-width:1000px;margin:0 auto}
.fig-carousel .fig-card{
  grid-area:1/1;margin:0;
  opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .8s ease,visibility 0s linear .8s;
}
.fig-carousel .fig-card.is-active{
  opacity:1;visibility:visible;pointer-events:auto;
  transition:opacity .8s ease,visibility 0s linear 0s;
}
.fig-dots{display:flex;justify-content:center;gap:8px;margin-top:20px}
.fig-dots .fig-dot{
  width:7px;height:7px;padding:0;border-radius:50%;
  background:var(--line);border:none;cursor:pointer;
  transition:background .2s;
}
.fig-dots .fig-dot.is-active{background:var(--ink)}
.fig-dots .fig-dot:hover{background:var(--gray)}

/* ---------- news ---------- */
.news-list{border-top:1px solid var(--line)}
/* fixed time/label columns so the title (3rd column) starts at the same x on every row */
.news-list a{display:grid;grid-template-columns:120px 110px 1fr;gap:24px;align-items:baseline;padding:22px 4px;border-bottom:1px solid var(--line);transition:background .2s}
.news-list a:hover{background:#F3F3EF}
.news-list time{font-family:'Inter',sans-serif;font-size:13.5px;color:var(--gray)}
.news-list .cat{
  font-family:'Inter',sans-serif;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.news-list .cat.is-feed{color:var(--gray)}
/* CSS-drawn arrow (not a literal ↗ character) so it can't render as a color emoji glyph.
   Shared by any external-link label -- see the footer's "Google Mapで開く" link too. */
.ext-arrow::after{
  content:" ↗";
  font-family:'Inter',sans-serif;
  font-variant-emoji:text;
}
.news-list .t{font-size:15.5px;font-weight:500}

/* ---------- publications ---------- */
.pub-list{border-top:1px solid var(--line)}
.pub{display:block;padding:26px 4px;border-bottom:1px solid var(--line);transition:background .2s}
a.pub:hover{background:#F3F3EF}
.pub .meta{font-family:'Inter',sans-serif;font-size:13px;color:var(--gray);margin-bottom:6px}
.pub .t{font-size:16.5px;font-weight:500;line-height:1.7}
.pub .t a{border-bottom:1px solid var(--line)}
.pub .t a:hover{color:var(--accent);border-color:var(--accent)}
.pub .t .pub-cite-meta{color:var(--gray);font-weight:400}
.pub .t strong{color:var(--ink);font-weight:700}
.pub .t .in-press{
  display:inline-block;white-space:nowrap;text-indent:0;font-family:'Inter',sans-serif;font-size:10px;font-weight:600;
  letter-spacing:.06em;text-transform:uppercase;color:var(--accent);
  border:1px solid var(--accent);border-radius:3px;padding:1px 6px;margin-left:2px;
}
/* front-page teaser: clip long citations to 2 lines */
.pub-teaser-clamp{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ---------- publications archive page (full history list) ---------- */
/* .pub-section is a <section> element -- reset the generic homepage section-shell
   padding/border (72px/border-bottom) so it doesn't leave an empty band + stray rule
   under the sticky sub-nav on this page. */
.pub-section{padding:0;border-bottom:none;margin-bottom:64px}
.pub-section:last-child{margin-bottom:0}
.pub-section .sec-head .count{font-size:13px;color:var(--gray)}
.pub-subhead{font-family:'Zen Kaku Gothic New',sans-serif;font-weight:700;font-size:18px;margin:40px 0 4px}
.pub-subhead:first-of-type{margin-top:24px}
.pub-subhead .en{font-family:'Inter',sans-serif;font-weight:400;font-size:12px;letter-spacing:.1em;color:var(--gray);text-transform:uppercase}
.pub-year{
  display:flex;align-items:baseline;gap:10px;
  font-family:'Inter',sans-serif;font-weight:500;font-size:15.5px;color:var(--accent);
  padding:20px 4px 6px;
}
.pub-year .count{font-size:12px;color:var(--gray)}
.pub-list.dense .pub{padding:14px 4px}
.pub-list.dense .pub .t{
  font-size:15px;font-weight:400;line-height:1.8;color:#3a3a38;
  padding-left:1.3em;text-indent:-1.3em;
}
.pub-list.dense .pub .t .pub-cite-meta{color:var(--gray);font-size:.93em}
.pub-list.dense .pub .t strong{color:var(--ink);font-weight:700}
.pub-list.dense .pub .t .in-press{
  display:inline-block;white-space:nowrap;text-indent:0;font-family:'Inter',sans-serif;font-size:10px;font-weight:600;
  letter-spacing:.06em;text-transform:uppercase;color:var(--accent);
  border:1px solid var(--accent);border-radius:3px;padding:1px 6px;margin-left:2px;
}

/* ---------- publications page: sticky section nav ---------- */
.pub-subnav{
  position:sticky;top:64px;z-index:40;
  display:flex;flex-wrap:wrap;gap:20px;
  background:var(--paper);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:10px 4px;margin:8px 0 32px;
  font-family:'Inter',sans-serif;font-size:12px;letter-spacing:.04em;
}
.pub-subnav a{color:var(--gray);padding-bottom:2px;border-bottom:1px solid transparent}
.pub-subnav a:hover{color:var(--accent)}
.pub-subnav a.is-active{color:var(--ink);border-bottom-color:var(--ink)}

/* ---------- profile ---------- */
.profile{display:grid;grid-template-columns:380px 1fr;gap:56px;align-items:start}
.photo{
  aspect-ratio:3/4;
  background:center/cover no-repeat #EDEDE8;
}
.profile h3{font-family:'Zen Kaku Gothic New',sans-serif;font-weight:700;font-size:25px;margin-bottom:4px}
.profile .en-name{font-family:'Inter',sans-serif;font-size:13px;letter-spacing:.12em;color:var(--gray);text-transform:uppercase;margin-bottom:24px}
.profile p{max-width:36em;font-size:15.5px;color:#3a3a38;margin-bottom:14px}

/* ---------- profile page (page-profile.php) ---------- */
.profile-label{font-family:'Inter',sans-serif;font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--gray);margin-bottom:12px}
.profile-subname{font-family:'Inter',sans-serif;font-size:14px;color:var(--gray);letter-spacing:.02em;margin-top:-6px;margin-bottom:40px}
.profile-page .profile{margin-bottom:56px}
.profile-page .profile p{margin-bottom:1.4em}

.profile-section{margin-bottom:56px}
.profile-section:last-of-type{margin-bottom:40px}

.profile-timeline{border-top:1px solid var(--line)}
.profile-timeline .row{
  display:grid;grid-template-columns:88px 1fr;gap:20px;
  padding:16px 4px;border-bottom:1px solid var(--line);
}
.profile-timeline .row .yr{font-family:'Inter',sans-serif;font-weight:500;color:var(--accent);font-size:15px}
.profile-timeline .row .tx{color:var(--ink);font-size:14.5px;line-height:1.8}
.profile-timeline .row .tx a{border-bottom:1px solid var(--line)}
.profile-timeline .row .tx a:hover{color:var(--accent);border-color:var(--accent)}

.profile-plain-list{border-top:1px solid var(--line)}
.profile-plain-list .row{padding:14px 4px;border-bottom:1px solid var(--line);color:var(--ink);font-size:14.5px;line-height:1.8}
.profile-plain-list .row a{border-bottom:1px solid var(--line)}
.profile-plain-list .row a:hover{color:var(--accent);border-color:var(--accent)}

.profile-cv-link{display:inline-block;margin:8px 0 24px;font-size:13px;color:var(--gray);border-bottom:1px solid var(--line);padding-bottom:2px}
.profile-cv-link:hover{color:var(--ink);border-color:var(--ink)}

/* ---------- footer ---------- */
footer{padding:64px 0 40px}
.foot-grid{display:grid;grid-template-columns:1.2fr .8fr 1fr 1fr;gap:32px;margin-bottom:56px}
.foot-grid h4{font-family:'Inter',sans-serif;font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--gray);margin-bottom:16px}
.foot-grid ul{list-style:none}
.foot-grid li{margin-bottom:8px;font-size:14px}
.foot-grid a:hover{color:var(--accent)}
.foot-note{font-size:12px;line-height:1.8;color:var(--gray);margin-top:12px}
.foot-note a{border-bottom:1px solid var(--line)}
.foot-note a:hover{color:var(--accent);border-color:var(--accent)}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding-top:24px;font-family:'Inter',sans-serif;font-size:12px;color:var(--gray)}

/* ---------- static page / single post shell ---------- */
.page-hero-offset{padding:150px 0 88px}
.page-hero-offset h1{font-family:'Zen Kaku Gothic New',sans-serif;font-weight:900;font-size:clamp(30px,4.2vw,46px);line-height:1.5;margin-bottom:20px}
.page-hero-offset .meta{font-family:'Inter',sans-serif;font-size:13px;color:var(--gray);margin-bottom:12px}
.single-post-meta{display:flex;align-items:center;gap:16px;font-family:'Inter',sans-serif;font-size:13px;color:var(--gray);margin-bottom:16px}
.single-post-meta .cat{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}
.single-post-meta + h1{padding-bottom:28px;border-bottom:1px solid var(--line);margin-bottom:32px}
.page-hero-offset .content{margin-top:28px;max-width:70ch;font-size:16px}
.page-hero-offset .content p{margin-bottom:1.4em}
.page-hero-offset .content img{height:auto;margin:1.4em 0}
.page-hero-offset .content.content-wide{max-width:none}
.page-hero-offset .back-link{display:inline-block;margin-top:56px;font-size:14px;color:var(--gray);border-bottom:1px solid var(--line);padding-bottom:2px}
.page-hero-offset .back-link:hover{color:var(--ink);border-color:var(--ink)}
.pagination{display:flex;gap:20px;margin-top:48px;font-family:'Inter',sans-serif;font-size:13px}
.pagination a,.pagination span{color:var(--gray)}
.pagination a:hover{color:var(--ink)}
.pagination .current{color:var(--ink);font-weight:500}

/* ---------- responsive ---------- */
@media(max-width:860px){
  nav{display:none}
  .menu-btn{display:block;font-family:'Inter',sans-serif;font-size:13px;letter-spacing:.14em;background:none;border:none;cursor:pointer;color:inherit}
  .research-grid{grid-template-columns:1fr}
  .r-item:not(:last-child){border-right:none}
  .news-list a{grid-template-columns:96px 1fr;grid-template-rows:auto auto}
  .news-list .cat{grid-column:2}
  .news-list .t{grid-column:1/-1}
  .profile{grid-template-columns:1fr}
  .photo{max-width:320px}
  .foot-grid{grid-template-columns:1fr 1fr}
  .hero-in{padding-bottom:72px}
  .figure-band .fig-card{padding:20px 16px 14px}
  .figure-band img{height:260px}
  .profile-timeline .row{grid-template-columns:1fr;gap:4px;padding:14px 4px}
  .profile-timeline .row .yr{font-size:13px}

  body.nav-open nav{
    display:flex;flex-direction:column;align-items:flex-start;gap:0;
    position:absolute;top:64px;left:0;right:0;
    background:rgba(251,251,249,.98);backdrop-filter:blur(8px);
    color:var(--ink);border-bottom:1px solid var(--line);padding:8px 24px 20px;
  }
  body.nav-open nav ul{flex-direction:column;align-items:flex-start;gap:0;width:100%}
  body.nav-open nav a{padding:12px 0;width:100%;border-bottom:1px solid var(--line)}
}

@media(max-width:520px){
  .foot-grid{grid-template-columns:1fr;gap:40px}
}