/* ==========================================================
   マイクロ流体力学研究室  共通スタイル
   ブレークポイント: 1024px（タブレット）／ 640px（スマートフォン）
   ========================================================== */

:root {
  --ground: #F5F4EF;
  --surface: #FFFFFF;
  --ink: #0F1B2D;
  --ink-2: #3A434D;
  --ink-3: #555D66;
  --line: #DAD8D0;
  --line-2: #E6E4DC;
  --chip-line: #C9C6BB;
  --accent: #0B6E8A;
  --link: #0B5F7A;
  --link-hover: #08445A;
  --accent-light: #8FD3E8;
  --dark-2: #C7CDD4;
  --font-body: 'Zen Kaku Gothic New', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
  --font-display: 'Fraunces', Georgia, serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, Menlo, monospace;
  --gutter: 120px;
  --radius-lg: 24px;
  --radius-md: 16px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--ground);
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; }
h1, h2, h3, p { margin: 0; }
ul { list-style: none; margin: 0; padding: 0; }

.container { width: 100%; max-width: 1440px; margin: 0 auto; padding-left: var(--gutter); padding-right: var(--gutter); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--link);
}
.mono { font-family: var(--font-mono); }

/* ---------- Header ---------- */
.site-header { border-bottom: 1px solid var(--line); background: var(--ground); position: relative; z-index: 10; }
.site-header .container { height: 80px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 14px; color: var(--ink); }
.brand:hover { text-decoration: none; color: var(--ink); }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-ja { font-size: 16px; font-weight: 700; letter-spacing: 0.04em; }
.brand-en { font-family: var(--font-mono); font-size: 11px; color: var(--ink-3); letter-spacing: 0.08em; }
.global-nav { display: flex; align-items: center; gap: 36px; font-size: 15px; font-weight: 500; }
.global-nav a { color: var(--ink); padding: 4px 0; }
.global-nav a[aria-current="page"] { color: var(--link); border-bottom: 2px solid var(--link); }
.menu-toggle {
  display: none;
  width: 44px; height: 44px; border-radius: 999px;
  border: 1px solid var(--ink); background: transparent;
  align-items: center; justify-content: center; cursor: pointer;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  height: 52px; padding: 0 28px; border-radius: 999px;
  font-size: 16px; font-weight: 500; white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--ink); color: var(--ground); }
.btn-primary:hover { color: var(--ground); background: #22324A; }
.btn-outline { border: 1px solid var(--ink); color: var(--ink); }
.btn-outline:hover { color: var(--ink); background: rgba(15, 27, 45, 0.05); }
.btn-light { background: #FFFFFF; color: var(--ink); font-weight: 700; height: 56px; padding: 0 32px; }
.btn-light:hover { color: var(--ink); background: #EEF4F6; }

/* ---------- Hero ---------- */
.hero .container {
  padding-top: 96px; padding-bottom: 72px;
  display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 64px; align-items: center;
}
.hero-text { display: flex; flex-direction: column; gap: 32px; }
.hero h1 { font-size: 52px; line-height: 1.4; font-weight: 700; letter-spacing: 0.01em; }
.hero-lead { font-size: 18px; line-height: 1.9; color: var(--ink-2); max-width: 560px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-figure { height: 520px; border-radius: 28px; background: #ECEAE2; overflow: hidden; }
.hero-figure svg { width: 100%; height: 100%; display: block; }

/* ---------- Section heads ---------- */
.section { padding-top: 120px; padding-bottom: 80px; }
.section-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 48px; margin-bottom: 40px; }
.section-head .titles { display: flex; flex-direction: column; gap: 16px; }
.section-head h2 { font-size: 36px; font-weight: 700; line-height: 1.3; }
.section-head .lead { max-width: 520px; font-size: 16px; line-height: 1.9; color: var(--ink-2); }
.section-head .more { font-size: 14px; white-space: nowrap; }
#research .section-head h2 { font-size: 44px; }

/* ---------- Research cards ---------- */
.research-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.research-card { background: var(--surface); border-radius: var(--radius-lg); padding: 40px; display: flex; flex-direction: column; gap: 20px; }
.research-card .thumb { height: 220px; border-radius: var(--radius-md); overflow: hidden; }
.research-card .thumb img { width: 100%; height: 100%; }
.thumb-cover img { object-fit: cover; }
.thumb-contain { background: #FFFFFF; }
.thumb-contain img { object-fit: contain; }
.research-card .title-row { display: flex; gap: 16px; align-items: baseline; }
.research-card .num { font-family: var(--font-display); font-style: italic; font-size: 28px; color: var(--link); }
.research-card h3 { font-size: 24px; font-weight: 700; line-height: 1.45; }
.research-card p { font-size: 15px; line-height: 1.85; color: var(--ink-2); }
.tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: auto; }
.tag { padding: 6px 12px; border-radius: 999px; border: 1px solid var(--chip-line); font-size: 12px; }

/* ---------- Facilities ---------- */
.facilities {
  background: var(--ink); color: var(--ground); border-radius: 32px; padding: 64px 72px;
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 64px; align-items: center;
}
.facilities .intro { display: flex; flex-direction: column; gap: 20px; }
.facilities .eyebrow { color: var(--accent-light); }
.facilities h2 { font-size: 36px; line-height: 1.45; font-weight: 700; }
.facilities .intro p { font-size: 15px; line-height: 1.8; color: var(--dark-2); }
.facilities .photo { height: 340px; border-radius: var(--radius-md); background: #E6E6E5; overflow: hidden; }
.facilities .photo img { width: 100%; height: 100%; object-fit: contain; }
.facility-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.facility { display: flex; flex-direction: column; gap: 10px; border-top: 1px solid #4A5566; padding-top: 16px; }
.facility.main { border-top-color: var(--accent-light); }
.facility .name { font-size: 18px; font-weight: 700; }
.facility .model { font-family: var(--font-mono); font-size: 11px; line-height: 1.7; color: var(--accent-light); }
.facility .desc { font-size: 14px; line-height: 1.7; color: var(--dark-2); }

/* ---------- News & papers ---------- */
.news-papers { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 72px; }
.news-papers .section-head { margin-bottom: 32px; }
.news-list li { display: grid; grid-template-columns: 110px minmax(0, 1fr); gap: 20px; padding: 20px 0; border-top: 1px solid var(--line); }
.news-list li:last-child { border-bottom: 1px solid var(--line); }
.news-list .date { font-family: var(--font-mono); font-size: 13px; color: var(--ink-3); }
.news-list .text { font-size: 15px; line-height: 1.7; }
.paper-cards { display: flex; flex-direction: column; gap: 16px; }
.paper-card { display: flex; flex-direction: column; gap: 12px; padding: 28px; border-radius: 20px; background: var(--surface); color: var(--ink); }
.paper-card:hover { text-decoration: none; color: var(--ink); box-shadow: 0 0 0 1px var(--chip-line); }
.paper-card .venue { font-family: var(--font-mono); font-size: 12px; color: var(--link); }
.paper-card .title { font-family: var(--font-display); font-size: 21px; line-height: 1.4; }
.paper-card .authors { font-size: 13px; color: var(--ink-3); }

/* ---------- Members ---------- */
.members { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px; }
.pi-card { background: var(--surface); border-radius: var(--radius-lg); padding: 48px; display: flex; flex-direction: column; }
.placeholder {
  border-radius: var(--radius-md); background: #E4ECEF; display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 12px; color: var(--ink-2); text-align: center; padding: 8px;
}
.pi-info { display: flex; flex-direction: column; gap: 14px; }
.pi-name { font-size: 32px; font-weight: 700; line-height: 1.2; }
.pi-name-en { font-family: var(--font-display); font-size: 18px; color: var(--ink-2); }
.pi-info .meta, .pi-info .bio { font-size: 14px; line-height: 1.8; color: var(--ink-2); }
.pi-links { display: flex; gap: 16px; flex-wrap: wrap; font-size: 14px; }
.members-card { background: var(--surface); border-radius: var(--radius-lg); padding: 48px; display: flex; flex-direction: column; gap: 24px; }
.counts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.count { display: flex; flex-direction: column; gap: 4px; padding: 20px; border-radius: var(--radius-md); background: var(--ground); }
.count .n { font-family: var(--font-display); font-size: 40px; line-height: 1; }
.count .label { font-size: 13px; color: var(--ink-2); }
.member-list { margin: 0; display: flex; flex-direction: column; }
.member-list div { display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 12px; padding: 10px 0; border-top: 1px solid var(--line-2); }
.member-list dt { font-family: var(--font-mono); font-size: 12px; color: var(--link); line-height: 1.8; }
.member-list dd { margin: 0; font-size: 14px; line-height: 1.8; color: var(--ink-2); }
.members-card .names { font-size: 14px; line-height: 1.9; color: var(--ink-2); }

/* ---------- Join ---------- */
.join {
  background: var(--accent); color: #FFFFFF; border-radius: 32px; padding: 64px 72px;
  display: flex; justify-content: space-between; align-items: center; gap: 48px;
}
.join .text { display: flex; flex-direction: column; gap: 16px; max-width: 720px; }
.join .eyebrow { color: #FFFFFF; }
.join h2 { font-size: 36px; line-height: 1.45; font-weight: 700; }
.join p { font-size: 16px; line-height: 1.8; }

/* ---------- Funding (top page) ---------- */
.funder-grid {
  display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-md); overflow: hidden;
}
.funder-grid div { background: var(--ground); padding: 24px; font-size: 14px; font-weight: 500; }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: var(--ground); margin-top: 40px; }
.site-footer .container { padding-top: 72px; padding-bottom: 48px; display: flex; flex-direction: column; gap: 48px; }
.footer-cols { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr); gap: 48px; }
.footer-cols .lab { display: flex; flex-direction: column; gap: 12px; }
.footer-cols .lab .ja { font-size: 20px; font-weight: 700; }
.footer-cols .lab .en { font-family: var(--font-display); font-size: 16px; color: var(--dark-2); }
.footer-cols .col { display: flex; flex-direction: column; gap: 10px; font-size: 14px; line-height: 1.8; color: var(--dark-2); }
.footer-cols .eyebrow { color: var(--accent-light); font-size: 12px; }
.site-footer a { color: var(--accent-light); }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; border-top: 1px solid #2C3A4F; padding-top: 24px; font-family: var(--font-mono); font-size: 12px; color: #8C96A3; }

/* ---------- Sub pages ---------- */
.page-head .container { padding-top: 96px; padding-bottom: 48px; display: flex; flex-direction: column; gap: 20px; }
.page-head h1 { font-size: 56px; font-weight: 700; line-height: 1.2; }
.page-head p { font-size: 16px; line-height: 1.9; color: var(--ink-2); max-width: 760px; }
.page-head .btn { align-self: flex-start; height: 48px; font-size: 15px; }

/* Publications */
.pub-toolbar { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding-bottom: 40px; }
.filters { display: flex; gap: 10px; flex-wrap: wrap; }
.filter {
  height: 44px; padding: 0 20px; border-radius: 999px; font-family: inherit; font-size: 14px; cursor: pointer;
  background: transparent; color: var(--ink); border: 1px solid var(--chip-line);
}
.filter[aria-pressed="true"] { background: var(--ink); color: var(--ground); border-color: var(--ink); }
.pub-count { font-family: var(--font-mono); font-size: 13px; color: var(--ink-3); white-space: nowrap; }
.pub-years { display: flex; flex-direction: column; gap: 40px; padding-bottom: 96px; }
.pub-year { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 48px; }
.pub-year > h2 { font-family: var(--font-display); font-weight: 400; font-size: 56px; line-height: 1; }
.pub-list { display: flex; flex-direction: column; gap: 12px; }
.pub { background: var(--surface); border-radius: var(--radius-md); padding: 20px 28px; display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 24px; align-items: start; }
.pub .kind { display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
.pub .badge { padding: 5px 12px; border-radius: 999px; font-size: 12px; font-weight: 500; }
.badge-paper { background: var(--ink); color: var(--ground); }
.badge-intl { background: #D7E9EF; color: var(--ink); }
.badge-dom { background: #ECE6DA; color: var(--ink); }
.pub .ref { font-size: 11px; color: var(--ink-3); }
.pub .body { display: flex; flex-direction: column; gap: 6px; }
.pub .title { font-size: 16px; line-height: 1.55; font-weight: 500; }
.pub .authors { font-size: 13px; line-height: 1.6; color: var(--ink-2); }
.pub .authors strong { color: var(--ink); }
.pub .venue { font-family: var(--font-mono); font-size: 12px; color: var(--ink-3); }
.pub-source { margin-left: 248px; font-size: 13px; color: var(--ink-3); }
[hidden] { display: none !important; }

/* Grants */
.grants { display: flex; flex-direction: column; gap: 20px; padding-bottom: 96px; }
.grant-block { background: var(--surface); border-radius: var(--radius-lg); padding: 40px 48px; display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: 48px; }
.grant-block.highlight { border: 2px solid var(--ink); }
.grant-block .funder { display: flex; flex-direction: column; gap: 16px; }
.grant-block h2 { font-size: 20px; line-height: 1.5; font-weight: 700; }
.grant-block h2 small { display: block; font-size: 14px; font-weight: 500; color: var(--ink-2); }
.banners { display: flex; flex-direction: column; gap: 10px; }
.banners a { display: block; width: fit-content; }
.grant-list li { display: flex; flex-direction: column; gap: 6px; padding: 18px 0; border-top: 1px solid var(--line-2); }
.grant-list .period { font-family: var(--font-mono); font-size: 13px; color: var(--link); }
.grant-list .theme { font-size: 17px; line-height: 1.6; }
.grant-list .ack { font-size: 14px; text-decoration: underline; text-underline-offset: 3px; }
.grant-small { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.grant-small section { background: var(--surface); border-radius: var(--radius-lg); padding: 32px 40px; display: flex; flex-direction: column; gap: 12px; }
.grant-small h2 { font-size: 18px; font-weight: 700; }
.grant-small .period { font-family: var(--font-mono); font-size: 13px; color: var(--link); border-top: 1px solid var(--line-2); padding-top: 14px; }
.grant-small .theme { font-size: 16px; line-height: 1.6; }

.sub-footer .container { padding-top: 40px; padding-bottom: 40px; flex-direction: row; justify-content: space-between; font-family: var(--font-mono); font-size: 12px; color: var(--dark-2); }

/* ==========================================================
   タブレット（〜1024px）
   ========================================================== */
@media (max-width: 1024px) {
  :root { --gutter: 40px; }
  .site-header .container { height: 72px; }
  .menu-toggle { display: inline-flex; }
  .global-nav {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--ground); border-bottom: 1px solid var(--line); padding: 8px var(--gutter) 16px;
  }
  .global-nav.open { display: flex; }
  .global-nav a { padding: 14px 0; border-bottom: 1px solid var(--line-2); }
  .global-nav a[aria-current="page"] { border-bottom: 1px solid var(--line-2); }

  .hero .container { grid-template-columns: 1fr; padding-top: 64px; padding-bottom: 48px; gap: 40px; }
  .hero h1 { font-size: 42px; }
  .hero-lead { font-size: 17px; max-width: none; }
  .hero-figure { height: 360px; }

  .section { padding-top: 88px; padding-bottom: 64px; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 16px; }
  .section-head h2, #research .section-head h2 { font-size: 32px; }
  .research-card { padding: 24px; gap: 14px; }
  .research-card .thumb { height: 160px; }
  .research-card h3 { font-size: 19px; }
  .research-card p { font-size: 14px; }

  .facilities { grid-template-columns: 1fr; padding: 48px 40px; gap: 32px; border-radius: 28px; }
  .facilities h2 { font-size: 30px; }
  .facilities .photo { height: 300px; }

  .news-papers { grid-template-columns: 1fr; gap: 56px; }
  .news-papers .section-head { flex-direction: row; align-items: flex-end; }
  .members { grid-template-columns: 1fr; }
  .join { flex-direction: column; align-items: flex-start; padding: 48px 40px; gap: 24px; }
  .join h2 { font-size: 30px; }
  .funder-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-cols { grid-template-columns: 1fr 1fr; }
  .footer-cols .lab { grid-column: 1 / -1; }

  .page-head .container { padding-top: 64px; }
  .page-head h1 { font-size: 44px; }
  .pub-year { grid-template-columns: 1fr; gap: 16px; }
  .pub-year > h2 { font-size: 40px; }
  .pub-source { margin-left: 0; }
  .grant-block { grid-template-columns: 1fr; gap: 24px; padding: 32px; }
}

/* ==========================================================
   スマートフォン（〜640px）
   ========================================================== */
@media (max-width: 640px) {
  :root { --gutter: 20px; }
  .site-header .container { height: 64px; }
  .brand-ja { font-size: 14px; }
  .brand-en { display: none; }

  .hero .container { padding-top: 40px; padding-bottom: 32px; gap: 24px; }
  .hero-text { gap: 20px; }
  .hero .eyebrow { font-size: 11px; letter-spacing: 0.1em; }
  .hero h1 { font-size: 28px; line-height: 1.45; }
  .hero-lead { font-size: 15px; line-height: 1.85; }
  .hero-actions .btn { width: 100%; }
  .hero-figure { height: 260px; border-radius: 20px; }

  .section { padding-top: 56px; padding-bottom: 40px; }
  .section-head { margin-bottom: 24px; }
  .section-head h2, #research .section-head h2 { font-size: 28px; }
  .section-head .lead { font-size: 14px; }
  .eyebrow { font-size: 11px; }
  .research-grid { grid-template-columns: 1fr; gap: 16px; }
  .research-card { border-radius: 20px; }
  .research-card .thumb { height: 180px; }
  .research-card h3 { font-size: 18px; }

  .facilities { padding: 32px 24px; border-radius: 24px; }
  .facilities h2 { font-size: 24px; }
  .facilities .photo { height: 260px; }
  .facility-list { grid-template-columns: 1fr; gap: 16px; }

  .news-list li { grid-template-columns: 1fr; gap: 6px; padding: 16px 0; }
  .news-list .text { font-size: 14px; }
  .paper-card { padding: 20px; }
  .paper-card .title { font-size: 17px; }

  .pi-card { padding: 28px 24px; }
  .pi-name { font-size: 26px; }
  .members-card { padding: 28px 24px; }
  .count { padding: 14px; }
  .count .n { font-size: 30px; }

  .join { padding: 32px 24px; border-radius: 24px; }
  .join h2 { font-size: 22px; }
  .join p { font-size: 14px; }
  .join .btn-light { width: 100%; height: 52px; }

  .funder-grid { grid-template-columns: 1fr 1fr; }
  .funder-grid div { padding: 16px; font-size: 13px; }

  .site-footer .container { padding-top: 40px; padding-bottom: 32px; gap: 28px; }
  .footer-cols { grid-template-columns: 1fr; gap: 24px; }

  .page-head .container { padding-top: 40px; padding-bottom: 32px; }
  .page-head h1 { font-size: 34px; }
  .page-head p { font-size: 14px; }
  .pub-toolbar { flex-direction: column; align-items: flex-start; gap: 12px; padding-bottom: 24px; }
  .filter { height: 40px; padding: 0 16px; font-size: 13px; }
  .pub { grid-template-columns: 1fr; gap: 10px; padding: 18px 20px; }
  .pub .kind { flex-direction: row; align-items: center; gap: 10px; }
  .pub-year > h2 { font-size: 32px; }
  .grant-block { padding: 24px 20px; border-radius: 20px; }
  .grant-list .theme { font-size: 15px; }
  .grant-small { grid-template-columns: 1fr; }
  .grant-small section { padding: 24px 20px; }
  .sub-footer .container { flex-direction: column; gap: 12px; }
}

@media (max-width: 640px) { .br-pc { display: none; } }