/* ==========================================================================
   CIRoS – styles.css
   Layer order: 1 root tokens / 2 base-reset / 3 lang utilities /
                4 rail signature / 5 layout / 6 components /
                7 responsive / 8 keyframes + reduced-motion
   視覚言語: ヘテロコア光ファイバセンシング —
   「光がファイバ（レール）を走り、センシング点（ノード）で計測する」
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. ROOT TOKENS
   -------------------------------------------------------------------------- */
:root {
  /* color */
  --bg: #f7f6f2;
  --surface: #ffffff;
  --accent: #1a4fa0;
  --accent2: #e84e1b;
  --accent-light: #dce8ff;
  --navy-deep: #10306b;
  --navy-bright: #2a6abf;
  --footer-bg: #0f2a55;
  --ink: #16233c;
  --ink-soft: #4c5a72;
  --hairline: rgba(26, 79, 160, .16);
  --border: rgba(26, 79, 160, .16);
  --hairline-strong: rgba(26, 79, 160, .30);
  --rail-color: rgba(26, 79, 160, .28);
  --pulse-core: rgba(232, 78, 27, .85);

  /* typography */
  --sans: 'IBM Plex Sans', 'IBM Plex Sans JP', sans-serif;
  --mono: 'IBM Plex Mono', 'IBM Plex Sans JP', monospace;
  --fs-2xs: .72rem;
  --fs-xs: .8rem;
  --fs-sm: .875rem;
  --fs-md: .9rem;
  --fs-lg: 1rem;
  --fs-h2: clamp(1.7rem, 3vw, 2.2rem);
  --fs-h1: clamp(2.5rem, 5vw, 3.2rem);

  /* spacing */
  --sp-1: .25rem;
  --sp-2: .5rem;
  --sp-3: 1rem;
  --sp-4: 1.5rem;
  --sp-5: 2.5rem;
  --sp-6: 4rem;
  --rail-gutter: 1.75rem;

  /* radius */
  --radius-sm: 6px;
  --radius: 8px;

  /* elevation: 既定は影なし（ヘアラインのみ）。hover 専用の1種のみ */
  --shadow-hover: 0 6px 20px rgba(26, 79, 160, .10);

  /* motion */
  --ease: cubic-bezier(.2, .7, .3, 1);
  --dur-fast: .16s;
  --dur-med: .26s;
}

/* --------------------------------------------------------------------------
   2. BASE / RESET
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--sans); background: var(--bg); color: var(--ink); line-height: 1.8; overflow-x: hidden; }
h1, h2, h3, h4 { line-height: 1.25; }
cite { font-style: normal; }
address { font-style: normal; }
ul { list-style: none; }
img { max-width: 100%; }

/* --------------------------------------------------------------------------
   3. LANGUAGE-SWITCH UTILITIES
   -------------------------------------------------------------------------- */
html [lc="en"] { display: none; } /* html付与で詳細度を上げ、.partner-tag等のdisplay指定に勝たせる */
body.en [lc="ja"] { display: none; }
body.en [lc="en"] { display: block; }
.ie { display: none; } body.en .ie { display: inline; } body.en .ij { display: none; }

/* --------------------------------------------------------------------------
   4. RAIL SIGNATURE（光ファイバ・レール: 全て疑似要素、HTML 変更なし）
   -------------------------------------------------------------------------- */
section .container { position: relative; }
section .container::before {
  content: '';
  position: absolute;
  left: 2.5rem;
  top: -5.5rem;
  bottom: -5.5rem;
  width: 1px;
  background: var(--rail-color);
}
section .container::after {
  content: '';
  position: absolute;
  left: 2.5rem;
  width: 1px;
  height: 90px;
  top: -5.5rem;
  background: linear-gradient(to bottom, transparent, var(--pulse-core) 50%, transparent);
  opacity: 0;
  animation: rail-pulse 8s linear infinite;
}
#about .container::after { animation-delay: 0s; }
#center .container::after { animation-delay: 1.3s; }
#research .container::after { animation-delay: 2.6s; }
#publications .container::after { animation-delay: 3.9s; }
#awards .container::after { animation-delay: 5.2s; }
#grants .container::after { animation-delay: 6.5s; }

/* センサノード（見出しラベル上） */
.slabel { position: relative; }
.slabel::before {
  content: '';
  position: absolute;
  left: -1.75rem;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--bg);
}
.white-section .slabel::before { background: var(--surface); }

/* awards 年号ノード */
.ai { position: relative; }
.ai::before {
  content: '';
  position: absolute;
  left: -1.75rem;
  top: .6rem;
  transform: translateX(-50%);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  border: 2px solid var(--accent2);
  background: var(--bg);
}

/* --------------------------------------------------------------------------
   5. LAYOUT
   -------------------------------------------------------------------------- */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(247, 246, 242, .92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--hairline);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2.5rem; height: 60px;
}

section { padding: 5.5rem 0; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 2.5rem 0 4.25rem; }
.white-section { background: var(--surface); border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }

.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; align-items: start; }
.feat-list { display: flex; flex-direction: column; gap: var(--sp-3); }

footer { background: var(--footer-bg); color: rgba(220, 232, 255, .65); padding: 3.2rem 0 0; margin-top: 0; }
.fi { max-width: 1100px; margin: 0 auto; padding: 0 2.5rem 0 4.25rem; display: flex; justify-content: space-between; align-items: flex-start; gap: 2rem; }
.f-cols { display: flex; gap: 3rem; }

/* --------------------------------------------------------------------------
   6. COMPONENTS
   -------------------------------------------------------------------------- */

/* -- nav / brand / lang toggle -- */
.nav-brand { font-family: var(--mono); font-size: .95rem; font-weight: 500; color: var(--accent); text-decoration: none; display: flex; align-items: center; gap: .6rem; line-height: 1.2; }
.nav-logo { width: 38px; height: 38px; display: block; flex-shrink: 0; }
.nb-txt { display: flex; flex-direction: column; line-height: 1.2; }
.nav-brand span { font-size: .68rem; color: var(--ink-soft); letter-spacing: .08em; font-weight: 400; }
.nav-links { display: flex; gap: 1.6rem; list-style: none; align-items: center; }
.nav-links a { position: relative; font-size: var(--fs-xs); font-weight: 500; color: var(--ink-soft); text-decoration: none; transition: color var(--dur-fast) var(--ease); }
.nav-links a::after {
  content: ''; position: absolute; left: 0; right: 100%; bottom: -6px; height: 2px;
  background: var(--accent2); transition: right var(--dur-med) var(--ease);
}
.nav-links a:hover { color: var(--accent); }
.nav-links a:hover::after { right: 0; }

.lang-toggle { display: flex; border: 1px solid var(--hairline); border-radius: 4px; overflow: hidden; margin-left: 1.2rem; }
.lang-btn { padding: 4px 11px; font-size: .75rem; font-family: var(--mono); border: none; background: transparent; cursor: pointer; color: var(--ink-soft); transition: background-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease); }
.lang-btn.active { background: var(--accent); color: white; }
.lang-btn:active { transform: translateY(1px); }

.nav-toggle {
  display: none; flex-direction: column; justify-content: center; align-items: center;
  gap: 5px; width: 34px; height: 34px; border: 1px solid var(--hairline); border-radius: var(--radius-sm);
  background: transparent; cursor: pointer;
}
.nav-toggle-bar { display: block; width: 18px; height: 2px; background: var(--ink); transition: transform var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* -- hero -- */
.hero {
  position: relative; color: white; overflow: hidden;
  background:
    repeating-linear-gradient(0deg, rgba(220, 232, 255, .05) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(90deg, rgba(220, 232, 255, .05) 0 1px, transparent 1px 48px),
    radial-gradient(900px 480px at 12% -15%, rgba(220, 232, 255, .12), transparent 60%),
    linear-gradient(150deg, var(--navy-deep) 0%, var(--accent) 55%, var(--navy-bright) 100%);
}
.hero-top { max-width: 1100px; margin: 0 auto; padding: 5rem 2.5rem 3.5rem 4.25rem; display: grid; grid-template-columns: 46% 54%; gap: 2rem; align-items: flex-end; }
.hero-badge { display: inline-flex; align-items: center; gap: .5rem; background: rgba(255, 255, 255, .12); border: 1px solid rgba(220, 232, 255, .35); border-radius: 4px; padding: 4px 12px; font-size: var(--fs-2xs); font-family: var(--mono); letter-spacing: .08em; color: rgba(255, 255, 255, .85); margin-bottom: 1.2rem; animation: fadeUp .4s ease .1s both; }
.hero-badge::before { content: '●'; font-size: .45rem; color: #ff7a4d; animation: badge-blink 2.4s ease-in-out infinite; }
h1.hero-title { font-size: var(--fs-h1); font-weight: 700; line-height: 1.25; letter-spacing: -.03em; margin-bottom: .9rem; animation: fadeUp .4s ease .15s both; }
h1.hero-title .dim { display: flex; align-items: center; gap: .7rem; font-family: var(--mono); font-weight: 500; font-size: .42em; letter-spacing: .3em; color: var(--accent-light); opacity: .8; margin-bottom: .6rem; }
.hero-logo { width: 52px; height: 52px; flex-shrink: 0; filter: drop-shadow(0 2px 6px rgba(2, 12, 46, .35)); }
h1.hero-title .dim + br { display: none; } /* .dim の block 化で直後の br が空行化するのを防ぐ */
.hero-sub { font-family: var(--mono); font-size: .78rem; letter-spacing: .1em; color: rgba(220, 232, 255, .75); margin-bottom: 1.6rem; line-height: 1.7; animation: fadeUp .4s ease .2s both; }
.hero-desc { font-size: var(--fs-md); color: rgba(255, 255, 255, .85); line-height: 1.95; max-width: 460px; margin-bottom: 2rem; animation: fadeUp .4s ease .25s both; }
.hero-btns { display: flex; gap: .7rem; animation: fadeUp .4s ease .3s both; }
.btn { padding: .6rem 1.4rem; font-size: var(--fs-xs); font-weight: 600; border-radius: 4px; text-decoration: none; transition: transform var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease); display: inline-flex; align-items: center; gap: .4rem; border: none; cursor: pointer; }
.btn-w { background: white; color: var(--accent); }
.btn-w:hover { background: var(--accent-light); transform: translateY(-2px); }
.btn-ow { background: transparent; color: white; border: 1px solid rgba(220, 232, 255, .4); }
.btn-ow:hover { background: rgba(255, 255, 255, .1); transform: translateY(-2px); }
.hero-img img { width: 100%; display: block;
  /* 図の文字・写真がフェードで欠けないよう白余白を外側に追加（フェード帯≈4-5%を余白内に収める） */
  background: #fff; padding: 20px;
  /* 白背景を navy へシームレスに: 外周をフェザーして白→透明へ溶かす */
  -webkit-mask-image: linear-gradient(to right, transparent 0, #000 4%, #000 96%, transparent 100%), linear-gradient(to bottom, transparent 0, #000 5%, #000 95%, transparent 100%);
  mask-image: linear-gradient(to right, transparent 0, #000 4%, #000 96%, transparent 100%), linear-gradient(to bottom, transparent 0, #000 5%, #000 95%, transparent 100%);
  -webkit-mask-composite: source-in; mask-composite: intersect;
  filter: drop-shadow(0 16px 34px rgba(0, 0, 0, .22)); }
/* h1タイトル文字の代替: 透過ロックアップロゴ（ロボットが人へ移動しカップを置くアニメ付き） */
.hero-lockup-anim { position: relative; display: block; width: min(460px, 100%); filter: drop-shadow(0 4px 12px rgba(2, 12, 46, .4)); }
.hero-lockup-anim .hl-base { display: block; width: 100%; height: auto; }
.hero-lockup-anim .hl-part { position: absolute; height: auto; }
.hl-robot { left: 17.35%; top: 32.82%; width: 15.98%; animation: hl-robot-in 1s ease-out .5s both; }
.hl-cup { left: 17.29%; top: 49.71%; width: 4.51%; animation: hl-cup-drop .45s cubic-bezier(.34, 1.56, .64, 1) 1.7s both; }
.hl-waves { left: 29.51%; top: 30.68%; width: 5.02%; animation: hl-waves-in .8s ease 2.25s both; }
@keyframes hl-robot-in { from { transform: translateX(11%); } to { transform: translateX(0); } }
@keyframes hl-cup-drop { from { opacity: 0; transform: translateY(-30%); } to { opacity: 1; transform: translateY(0); } }
@keyframes hl-waves-in { from { opacity: 0; } to { opacity: 1; } }

/* -- section heading kit -- */
.slabel { font-family: var(--mono); font-size: var(--fs-2xs); letter-spacing: .18em; text-transform: uppercase; color: var(--accent); margin-bottom: .6rem; }
.stitle { font-size: var(--fs-h2); font-weight: 700; letter-spacing: -.015em; color: var(--ink); margin-bottom: .7rem; }
.sdiv { width: 64px; height: 2px; margin-bottom: 2.6rem; background: linear-gradient(90deg, var(--accent2) 0 14px, var(--hairline) 14px 100%); }

/* -- about -- */
.about-p { font-size: var(--fs-md); color: var(--ink-soft); line-height: 1.95; margin-bottom: 1rem; }
.notice { background: var(--accent-light); border-left: 2px solid var(--accent); padding: .9rem 1.1rem; border-radius: 0 6px 6px 0; margin-top: 1.2rem; font-size: var(--fs-sm); color: var(--ink); }
.partners-label { font-family: var(--mono); font-size: var(--fs-2xs); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-soft); margin: 2rem 0 .8rem; }
.members-label { font-family: var(--mono); font-size: var(--fs-2xs); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-soft); margin-bottom: 1.2rem; }

.feat { position: relative; background: var(--surface); border: 1px solid var(--hairline); border-radius: 6px; padding: 1.1rem 1.3rem; display: flex; gap: 1rem; align-items: flex-start; transition: transform var(--dur-med) var(--ease), border-color var(--dur-med) var(--ease), box-shadow var(--dur-med) var(--ease); }
.feat::before { content: ''; position: absolute; left: -1px; top: 12%; bottom: 12%; width: 2px; background: var(--accent2); transform: scaleY(0); transform-origin: top; transition: transform var(--dur-med) var(--ease); }
.feat:hover { border-color: var(--hairline-strong); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.feat:hover::before { transform: scaleY(1); }
.feat-ic { width: 36px; height: 36px; border-radius: 6px; background: var(--accent-light); display: flex; align-items: center; justify-content: center; flex-shrink: 0; color: var(--accent); }
.feat-ic svg { display: block; }
.feat-t { font-size: var(--fs-lg); font-weight: 600; margin-bottom: .25rem; }
.feat-b { font-size: var(--fs-sm); color: var(--ink-soft); line-height: 1.7; }

.partners { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 2rem; }
.partner-tag { background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--radius-sm); padding: .55rem 1rem; font-family: var(--mono); font-size: .74rem; color: var(--ink-soft); display: flex; align-items: center; gap: .5rem; }
.partner-tag .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
body.en .partner-tag[lc="en"] { display: flex; } /* body.en [lc=en] の display:block より優先し flex レイアウトを維持 */

/* -- center / leadership -- */
.center-box { position: relative; background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--radius); padding: 2rem 2.2rem; margin-bottom: 2.5rem; }
.center-box--vice { border-color: var(--navy-bright); }
.center-box-label { position: absolute; top: -11px; left: 1.5rem; background: var(--accent); color: white; font-family: var(--mono); font-size: var(--fs-2xs); letter-spacing: .1em; text-transform: uppercase; padding: 2px 10px; border-radius: 2px; }
.center-box--vice .center-box-label { background: var(--navy-bright); }

.lead-desc { font-size: var(--fs-md); color: var(--ink-soft); line-height: 1.85; max-width: 680px; margin-bottom: 2rem; }
.lead-row { display: flex; gap: 1.5rem; align-items: flex-start; }
.lead-card { background: var(--accent); color: white; border-radius: var(--radius); padding: 1.2rem 1.5rem; min-width: 180px; flex-shrink: 0; transition: transform var(--dur-med) var(--ease), box-shadow var(--dur-med) var(--ease); }
.lead-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.lead-card--vice { background: var(--navy-bright); }
.lead-card-name { font-size: 1.05rem; font-weight: 600; margin-bottom: .15rem; }
.lead-card-role { font-size: .75rem; color: rgba(255, 255, 255, .75); line-height: 1.5; }
.lead-card-tag { font-family: var(--mono); font-size: .7rem; color: rgba(220, 232, 255, .55); margin-top: .4rem; }
.lead-bio { font-size: var(--fs-md); color: var(--ink-soft); line-height: 1.9; padding-top: .2rem; overflow-wrap: break-word; }

.lead-av { width: 56px; height: 56px; border-radius: 50%; overflow: hidden; margin-bottom: .7rem; flex-shrink: 0; }
.lead-av img { width: 100%; height: 100%; object-fit: cover; display: block; }
/* センター長・副センター長を横並びに */
.center-duo { display: grid; grid-template-columns: 1fr 1fr; gap: 1.8rem; margin-bottom: 2.5rem; }
.center-duo .center-box { margin-bottom: 0; }
.center-duo .lead-row { flex-direction: column; }

.member-box { background: transparent; border: none; padding: 0; box-shadow: none; }
.member-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: .9rem; margin-top: 1rem; }
.mc { background: var(--surface); border: 1px solid var(--hairline); border-radius: 6px; padding: 1.4rem 1rem; text-align: center; transition: transform var(--dur-med) var(--ease), border-color var(--dur-med) var(--ease), box-shadow var(--dur-med) var(--ease); }
.mc:hover { border-color: var(--hairline-strong); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.mc-av { width: 64px; height: 64px; border-radius: 50%; background: var(--accent-light); margin: 0 auto .6rem; display: flex; align-items: center; justify-content: center; font-size: 1rem; color: var(--accent); font-weight: 700; font-family: var(--mono); overflow: hidden; }
.mc-av img { width: 100%; height: 100%; object-fit: cover; display: block; }
.mc-n { font-size: .95rem; font-weight: 600; }
.mc-r { font-size: var(--fs-xs); color: var(--ink-soft); }
.mc-f { font-family: var(--mono); font-size: .72rem; color: var(--accent); background: transparent; border: 1px solid var(--hairline); padding: 2px 6px; border-radius: 3px; margin-top: .25rem; }
.mc-inst { font-family: var(--mono); font-size: .7rem; color: rgba(76, 90, 114, .6); margin-top: .25rem; }

/* -- research cards -- */
.rgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.rc { position: relative; background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--radius); padding: 1.5rem; overflow: hidden; transition: transform var(--dur-med) var(--ease), box-shadow var(--dur-med) var(--ease); }
.rc::after { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: var(--accent2); transform: scaleX(0); transform-origin: left; transition: transform var(--dur-med) var(--ease); }
.rc:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.rc:hover::after { transform: scaleX(1); }
.rc-img { margin: -1.5rem -1.5rem 1.1rem; aspect-ratio: 4 / 3; overflow: hidden; background: var(--accent-light); }
.rc-img img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform var(--dur-med) var(--ease); }
.rc:hover .rc-img img { transform: scale(1.04); }
.rc-n { font-family: var(--mono); font-size: var(--fs-2xs); color: var(--accent2); opacity: 1; margin-bottom: .6rem; }
.rc-t { font-size: var(--fs-lg); font-weight: 600; margin-bottom: .5rem; line-height: 1.4; }
.rc-b { font-size: var(--fs-sm); color: var(--ink-soft); line-height: 1.75; }
.rc-tag { display: inline-block; margin-top: .8rem; padding: 2px 8px; font-family: var(--mono); font-size: .72rem; border-radius: 3px; background: transparent; border: 1px solid var(--hairline); color: var(--accent); }

/* -- publications (editorial list) -- */
.plist { display: flex; flex-direction: column; gap: 0; border-top: 1px solid var(--hairline); }
.pi { background: transparent; border: none; border-bottom: 1px solid var(--hairline); border-radius: 0; box-shadow: none; display: block; padding: 1.2rem .2rem 1.2rem .9rem; transition: background-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease); }
.pi:hover { transform: none; box-shadow: inset 2px 0 0 var(--accent2); background: rgba(220, 232, 255, .22); }
.pt { font-size: var(--fs-lg); font-weight: 500; line-height: 1.55; color: var(--ink); margin-bottom: .18rem; display: block; }
.pa { font-family: var(--mono); font-size: .74rem; color: var(--ink-soft); margin-top: .3rem; }

/* -- awards (rail-connected timeline) -- */
.alist { display: flex; flex-direction: column; gap: 0; }
.ai { background: transparent; border: none; border-bottom: 1px solid var(--hairline); border-radius: 0; box-shadow: none; padding: .85rem 0; display: flex; gap: 1.1rem; align-items: flex-start; }
.ai:hover { transform: none; }
.ai:hover::before { background: var(--accent2); }
.ay { font-family: var(--mono); font-size: var(--fs-xs); font-weight: 500; color: var(--accent2); min-width: 3rem; padding-top: .1rem; }
.at { font-size: var(--fs-md); line-height: 1.7; }
.ai-body { min-width: 0; } /* 受賞: 本文+メタ行の縦積みコンテナ（flex子の折返し許可） */
.am { font-size: var(--fs-xs); color: var(--ink-soft); margin-top: .15rem; } /* 受賞: 授与機関・種別 */
.gd { font-size: var(--fs-2xs); font-family: var(--mono); letter-spacing: .02em; color: var(--ink-soft); margin-top: .3rem; } /* 資金: 期間・課題番号・機関・研究者 */

/* -- ニュース（index.html #news = 最新3件、news.html = 全件一覧） -- */
#news.news-preview .alist li:nth-child(n+4) { display: none; } /* トップは最新3件のみ（記事は先頭に追記する運用）。news.html は全件表示 */
.ni .ay { min-width: 6.4rem; } /* YYYY.MM.DD の幅 */
.ni-t { font-size: var(--fs-lg); font-weight: 600; line-height: 1.5; margin-bottom: .3rem; }
.ni-b { font-size: var(--fs-md); color: var(--ink-soft); line-height: 1.85; margin-bottom: .45rem; max-width: 46rem; }
.ni-link { display: inline-block; font-size: var(--fs-xs); font-weight: 600; color: var(--accent); text-decoration: none; }
.ni-link:hover { text-decoration: underline; }
body.en .ni-link [lc="en"] { display: inline; } /* リンク内spanのblock化による改行を防ぐ */

/* -- grants -- */
.ggrid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.gi { background: var(--surface); border: 1px solid var(--hairline); border-radius: 6px; padding: 1.2rem 1.4rem; transition: transform var(--dur-med) var(--ease), border-color var(--dur-med) var(--ease), box-shadow var(--dur-med) var(--ease); }
.gi:hover { border-color: var(--hairline-strong); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.gn { font-size: var(--fs-lg); font-weight: 600; margin-bottom: .25rem; line-height: 1.5; }
.gm { font-size: var(--fs-sm); color: var(--ink-soft); }
.ga { font-family: var(--mono); font-size: .74rem; color: var(--accent); margin-top: .45rem; font-weight: 500; }

/* -- footer -- */
.fb { font-family: var(--mono); font-size: .95rem; color: white; margin-bottom: .35rem; }
.fs { font-size: var(--fs-xs); line-height: 1.8; }
.fc h4 { font-family: var(--mono); font-size: var(--fs-2xs); letter-spacing: .1em; text-transform: uppercase; color: rgba(220, 232, 255, .4); margin-bottom: .7rem; }
.fc ul { list-style: none; }
.fc li { margin-bottom: .3rem; }
.fc a { font-size: var(--fs-xs); color: rgba(220, 232, 255, .65); text-decoration: none; transition: color var(--dur-fast) var(--ease); }
.fc a:hover { color: white; }
.fbot { max-width: 1100px; margin: 1.5rem auto 0; padding: 1.2rem 2.5rem 1.6rem 4.25rem; border-top: 1px solid rgba(220, 232, 255, .14); font-family: var(--mono); font-size: .72rem; color: rgba(220, 232, 255, .35); }

/* --------------------------------------------------------------------------
   7. RESPONSIVE
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
  section { padding: 4rem 0; }
  .container { padding-left: 3.6rem; }
  section .container::before { left: 2rem; }
  section .container::after { left: 2rem; }
  .slabel::before { left: -1.6rem; }
  .ai::before { left: -1.6rem; }
  .hero-top { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .member-row { grid-template-columns: repeat(2, 1fr); }
  .center-duo { grid-template-columns: 1fr; gap: 2.2rem; }
  .rgrid { grid-template-columns: 1fr 1fr; }
  .ggrid { grid-template-columns: 1fr; }
  .fi { flex-direction: column; }
}
@media (max-width: 600px) {
  nav { padding: 0 1.2rem; position: relative; }
  .nav-toggle { display: flex; }
  .nav-links {
    display: none; position: absolute; top: 60px; left: 0; right: 0; z-index: 99;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--hairline);
    padding: .5rem 1.2rem 1rem;
  }
  .nav-links.is-open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: .6rem 0; width: 100%; }
  .nav-links a::after { display: none; }
  section { padding: 3.25rem 0; }
  .container { padding: 0 1.2rem; }
  .hero-top { padding: 3rem 1.2rem 2rem; }
  /* JPタイトル1行目「知能ロボティクス・」(9文字) が <br> 前に折返さない上限サイズ */
  h1.hero-title { font-size: clamp(1.8rem, 9vw, 2.5rem); }
  section .container::before,
  section .container::after { display: none; }
  .slabel::before { display: none; }
  .ai::before { display: none; }
  .rgrid { grid-template-columns: 1fr; }
  .member-row { grid-template-columns: repeat(2, 1fr); }
  .f-cols { flex-direction: column; gap: 1.6rem; }
  .lead-row { flex-direction: column; }
  .lead-card { min-width: 0; width: 100%; }
}

/* --------------------------------------------------------------------------
   8. KEYFRAMES + REDUCED MOTION
   -------------------------------------------------------------------------- */
@keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }

@keyframes rail-pulse {
  0% { top: -5.5rem; opacity: 0; }
  8% { opacity: 1; }
  45% { opacity: 1; }
  55% { top: 100%; opacity: 0; }
  100% { top: 100%; opacity: 0; }
}

@keyframes badge-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: .5; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  section .container::after { display: none; }
  .feat:hover, .mc:hover, .rc:hover, .ai:hover, .pi:hover, .gi:hover, .lead-card:hover,
  .btn-w:hover, .btn-ow:hover {
    transform: none;
  }
}

/* achievements page */
.all-link { margin-top: 1.4rem; }
.all-link a { font-family: var(--mono); font-size: var(--fs-xs); font-weight: 500; color: var(--accent); text-decoration: none; transition: color var(--dur-fast) var(--ease); }
.all-link a:hover { color: var(--accent2); }
.gyoseki-empty { font-size: var(--fs-sm); color: var(--ink-soft); padding: 1.2rem .2rem; }
.gyoseki-major-star { color: var(--accent2); }
/* センター員の著者名。下線が文字に密着しないよう少し離す */
.gyoseki-member { text-decoration: underline; text-underline-offset: .18em; text-decoration-thickness: 1px; }
.gyoseki-legend { display: flex; align-items: center; gap: .4rem; margin-top: 1rem; font-size: var(--fs-2xs); font-family: var(--mono); letter-spacing: .06em; color: var(--ink-soft); }
html .gyoseki-legend [lc="en"] { display: none; }
body.en .gyoseki-legend [lc="ja"] { display: none; }
body.en .gyoseki-legend [lc="en"] { display: inline; }

/* -- achievements tabs -- */
/* navはheader内stickyのためスクロールで画面外に出る。top:60pxだと上に60pxの透け隙間が残るのでtop:0で密着させる */
.tabbar-wrap { position: sticky; top: 0; z-index: 90; background: rgba(247, 246, 242, .92); backdrop-filter: blur(12px); border-bottom: 1px solid var(--hairline); }
.tabbar { display: flex; gap: .4rem; padding-top: .6rem; padding-bottom: .6rem; }
.tab-btn {
  position: relative; font-family: var(--mono); font-size: var(--fs-xs); font-weight: 500;
  color: var(--ink-soft); background: transparent; border: 1px solid transparent; border-radius: 4px;
  padding: .55rem 1.1rem; cursor: pointer;
  transition: color var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}
.tab-btn::after {
  content: ''; position: absolute; left: .8rem; right: .8rem; bottom: -1px; height: 2px;
  background: var(--accent2); transform: scaleX(0); transform-origin: left; transition: transform var(--dur-med) var(--ease);
}
.tab-btn:hover { color: var(--accent); background: var(--accent-light); }
.tab-btn.active { color: var(--accent); font-weight: 600; }
.tab-btn.active::after { transform: scaleX(1); }
.tab-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

@media (max-width: 600px) {
  .tabbar-wrap { top: 0; }
  .tabbar { padding: .5rem 1.2rem; gap: .3rem; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .tab-btn { padding: .5rem .85rem; white-space: nowrap; flex-shrink: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .tab-btn, .tab-btn::after { transition: none; }
}