:root {
  --forest: #123c2b;
  --moss: #2f6b4f;
  --leaf: #6fae7f;
  --mint: #e8f1ea;
  --paper: #fbfdfb;
  --ink: #17251d;
  --muted: #5b6b61;
  --line: #d3e1d6;
  /* SNFG（糖鎖記号）の色 */
  --glc-nac: #0072bc;
  --man: #00a651;
  --gal: #ffd400;
  --neu: #a54399;
  --fuc: #ed1c24;
  --mincho: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", "Noto Serif JP", serif;
  --gothic: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;
  --latin: "Optima", "Candara", "Gill Sans", "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--gothic); font-size: 16px; line-height: 1.85; }
a { color: var(--moss); text-underline-offset: 3px; }
a:focus-visible { outline: 3px solid var(--gal); outline-offset: 2px; }
img { max-width: 100%; height: auto; display: block; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 1.5rem; }

/* SNFG記号（セクションの目印） */
.sym { display: inline-block; width: 14px; height: 14px; flex: none; }
.sym.circle { border-radius: 50%; background: var(--man); }
.sym.square { background: var(--glc-nac); }
.sym.diamond { background: var(--neu); transform: rotate(45deg) scale(.85); }
.sym.triangle { background: var(--fuc); clip-path: polygon(50% 4%, 100% 96%, 0 96%); }
.sym.yellow { border-radius: 50%; background: var(--gal); }

/* ===== ヘッダー ===== */
.site-header { position: sticky; top: 0; z-index: 20; background: var(--paper); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; min-height: 68px; }
.brand { text-decoration: none; color: var(--forest); font-family: var(--mincho); font-size: 1.15rem; letter-spacing: .1em; white-space: nowrap; }
.gnav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: .25rem; }
.gnav a { display: flex; align-items: center; gap: .55rem; padding: .45rem .8rem; color: var(--ink); text-decoration: none; font-size: .95rem; border-radius: 4px; }
.gnav a:hover { background: var(--mint); }
@media (max-width: 760px) {
  .site-header .wrap { flex-direction: column; align-items: stretch; gap: 0; padding-top: .6rem; }
  .gnav { overflow-x: auto; margin: 0 -1.5rem; padding: 0 1.5rem .4rem; scrollbar-width: none; }
  .gnav a { padding: .45rem .6rem; font-size: .9rem; white-space: nowrap; }
}

/* ===== トップ ===== */
.hero { background: var(--forest); color: #fff; position: relative; overflow: hidden; }
.hero .wrap { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 2rem; min-height: 420px; padding-top: 3.5rem; padding-bottom: 2.5rem; }
.hero .univ { margin: 0 0 1.2rem; font-size: .95rem; letter-spacing: .14em; color: #b9d8c2; }
.hero h1 { margin: 0; font-family: var(--mincho); font-weight: 500; font-size: clamp(2.3rem, 5.4vw, 3.9rem); line-height: 1.25; letter-spacing: .08em; }
.hero .en { margin: 1rem 0 0; font-family: var(--latin); font-size: 1.15rem; letter-spacing: .06em; color: #b9d8c2; }
.hero .lead { margin: 2.2rem 0 0; max-width: 26em; font-size: 1.02rem; line-height: 2; color: #e3efe6; border-left: 3px solid var(--gal); padding-left: 1rem; }
.glycan { width: 100%; max-width: 520px; justify-self: end; }
.glycan .bond { stroke: #8fc49d; stroke-width: 3; fill: none; }
.glycan .res { stroke: var(--forest); stroke-width: 3; }
.glycan text { font-family: var(--latin); font-size: 13px; fill: #b9d8c2; letter-spacing: .04em; }

/* 一度だけの描画アニメーション（還元末端から伸びていく） */
@media (prefers-reduced-motion: no-preference) {
  .glycan .bond { stroke-dasharray: 120; stroke-dashoffset: 120; animation: draw .5s ease-out forwards; animation-delay: var(--d); }
  .glycan .res { opacity: 0; transform-box: fill-box; transform-origin: center; animation: pop .4s ease-out forwards; animation-delay: var(--d); }
  .glycan text { opacity: 0; animation: fade .8s ease-out 2.4s forwards; }
}
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes pop { from { opacity: 0; transform: scale(.4); } to { opacity: 1; transform: scale(1); } }
@keyframes fade { to { opacity: 1; } }

@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; min-height: 0; padding-top: 2.5rem; padding-bottom: 2.5rem; }
  .glycan { justify-self: start; max-width: 420px; }
}

/* ===== 写真 ===== */
.photo-band { background: linear-gradient(var(--forest) 0 50%, var(--paper) 50% 100%); }
.photo-band figure { margin: 0 0 0 auto; max-width: 560px; }
.photo-band figcaption { margin-top: .5rem; font-size: .82rem; color: var(--muted); }
.photo-band img { width: 100%; aspect-ratio: 400 / 220; object-fit: cover; border-radius: 2px; background: var(--mint); }

/* ===== セクション共通 ===== */
main section { padding: 5rem 0 1rem; }
.sec-head { display: flex; align-items: center; gap: .9rem; margin: 0 0 2.2rem; }
.sec-head h1, .sec-head h2 { margin: 0; font-family: var(--mincho); font-weight: 500; font-size: 1.85rem; letter-spacing: .12em; color: var(--forest); }
.sec-head .en { font-family: var(--latin); color: var(--muted); font-size: .95rem; letter-spacing: .05em; padding-top: .4rem; }
.sec-head::after { content: ""; flex: 1; height: 1px; background: var(--line); margin-left: .5rem; margin-top: .4rem; }

/* ===== 研究内容 ===== */
.research { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
.research .ja { margin: 0; font-family: var(--mincho); font-size: 1.35rem; line-height: 2; color: var(--ink); }
.research .en-text { margin: 0; color: var(--muted); font-size: 1rem; line-height: 1.85; padding-top: .35rem; }
@media (max-width: 760px) { .research { grid-template-columns: 1fr; gap: 1rem; } .research .ja { font-size: 1.15rem; } }

/* ===== イベント ===== */
.events { list-style: none; margin: 0; padding: 0; border-top: 2px solid var(--forest); }
.events > li { display: grid; grid-template-columns: 9rem 1fr; gap: 1.5rem; padding: 1.6rem 0; border-bottom: 1px solid var(--line); }
.events time { font-family: var(--latin); font-size: 1.15rem; color: var(--moss); font-variant-numeric: tabular-nums; letter-spacing: .03em; }
.events .ev-text { margin: 0 0 1rem; font-size: 1.05rem; }
.events figure { margin: 0; max-width: 340px; }
.events img { width: 100%; height: auto; border-radius: 2px; }
@media (max-width: 560px) { .events > li { grid-template-columns: 1fr; gap: .3rem; } }

/* ===== メンバー ===== */
.staff { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); border-top: 2px solid var(--forest); }
.staff li { padding: 1.4rem 1.2rem 1.6rem 0; border-bottom: 1px solid var(--line); }
.staff li + li { padding-left: 1.2rem; border-left: 1px solid var(--line); }
.staff .role { margin: 0; font-size: .85rem; color: var(--moss); letter-spacing: .12em; }
.staff .name { margin: .3rem 0 .6rem; font-family: var(--mincho); font-size: 1.5rem; letter-spacing: .14em; line-height: 1.4; }
.staff .mail { margin: 0; font-size: .82rem; color: var(--muted); word-break: break-all; line-height: 1.6; }
.students { display: flex; flex-wrap: wrap; gap: .6rem 2.5rem; margin: 1.6rem 0 0; padding: 1.1rem 1.3rem; background: var(--mint); border-radius: 2px; }
.students div { display: flex; gap: .8rem; }
.students dt { color: var(--moss); }
.students dd { margin: 0; }
.mail-note { margin: .9rem 0 0; font-size: .85rem; color: var(--muted); }
@media (max-width: 860px) {
  .staff { grid-template-columns: 1fr 1fr; }
  .staff li:nth-child(3) { padding-left: 0; border-left: 0; }
}
@media (max-width: 480px) {
  .staff { grid-template-columns: 1fr; }
  .staff li, .staff li + li { padding: 1.1rem 0; border-left: 0; }
}

/* ===== 研究業績 ===== */
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.filters { position: sticky; top: 68px; z-index: 5; background: var(--paper); padding: .9rem 0 .6rem; border-bottom: 1px solid var(--line); margin-bottom: 1.5rem; }
.f-group { display: flex; align-items: center; flex-wrap: wrap; gap: .5rem 1rem; margin-bottom: .55rem; }
.f-label { width: 2.5em; flex: none; font-size: .85rem; color: var(--muted); }
.chips, .seg { display: flex; flex-wrap: wrap; gap: .35rem; }
.chips button, .seg button {
  font: inherit; font-size: .92rem; cursor: pointer; color: var(--ink); background: #fff;
  border: 1px solid var(--line); border-radius: 999px; padding: .28rem .95rem; font-variant-numeric: tabular-nums;
}
.chips button:hover, .seg button:hover { border-color: var(--leaf); }
.chips button[aria-pressed="true"], .seg button[aria-pressed="true"] { background: var(--forest); border-color: var(--forest); color: #fff; }
.chips button:focus-visible, .seg button:focus-visible, .search input:focus-visible { outline: 3px solid var(--gal); outline-offset: 2px; }
.search { flex: 1 1 16rem; min-width: 0; }
.search input { width: 100%; font: inherit; font-size: .92rem; padding: .38rem .9rem; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--ink); }
.summary { margin: .2rem 0 0; font-size: .85rem; color: var(--muted); }
.yr { margin-bottom: 2.5rem; }
.yr-title { margin: 0 0 .4rem; font-family: var(--latin); font-weight: 400; font-size: 2rem; line-height: 1.2; color: var(--moss); }
.grp { margin: 0 0 2rem; }
.grp h4 { margin: 1.2rem 0 .3rem; font-size: 1rem; color: var(--forest); display: flex; align-items: center; gap: .5rem; }
.grp h4 .n { font-size: .78rem; font-weight: 400; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 0 .55rem; }
.items { list-style: none; margin: 0; padding: 0; }
.it { padding: 1rem 0 1.05rem; border-top: 1px solid var(--line); max-width: 56em; }
.it .t { margin: 0; font-weight: 600; line-height: 1.6; }
.it .a { margin: .3rem 0 0; font-size: .88rem; color: var(--muted); line-height: 1.65; }
.it .a b { color: var(--ink); font-weight: 600; }
.it .j { margin: .25rem 0 0; font-size: .9rem; color: var(--moss); display: flex; flex-wrap: wrap; align-items: baseline; gap: .3rem .8rem; }
.it[lang="en"] .jn i { font-style: italic; }
.doi { font-size: .78rem; text-decoration: none; border: 1px solid var(--leaf); color: var(--moss); border-radius: 3px; padding: 0 .45rem; }
.doi:hover { background: var(--mint); }
.it details { margin-top: .45rem; font-size: .9rem; }
.it summary { cursor: pointer; color: var(--moss); width: fit-content; }
.it details p { margin: .4rem 0 0; padding: .7rem .9rem; background: var(--mint); border-radius: 2px; line-height: 1.85; }
.conf .it { display: grid; grid-template-columns: 3.2rem 1fr; gap: .5rem; }
.conf .mo { font-size: .85rem; color: var(--moss); padding-top: .15rem; font-variant-numeric: tabular-nums; }
.it .v { margin: .25rem 0 0; font-size: .88rem; color: var(--ink); }
.tag { display: inline-block; margin-left: .5rem; font-size: .72rem; color: var(--muted); border: 1px solid var(--line); border-radius: 3px; padding: 0 .4rem; }
.empty { color: var(--muted); padding: 1rem 0; }
[hidden] { display: none !important; }
@media (max-width: 760px) {
  .filters { position: static; }
  .f-label { width: 100%; }
  .chips { flex-wrap: nowrap; overflow-x: auto; margin: 0 -1.5rem; padding: 0 1.5rem .2rem; scrollbar-width: none; }
  .chips button { flex: none; }
  .conf .it { grid-template-columns: 1fr; gap: 0; }
}

/* ===== アクセス ===== */
.access { display: grid; grid-template-columns: 1fr auto; gap: 2rem; align-items: end; }
.access address { font-style: normal; font-size: 1.05rem; line-height: 2.1; }
.access .tel { display: inline-block; margin-top: .3rem; font-weight: 700; color: var(--forest); }
@media (max-width: 760px) { .access { grid-template-columns: 1fr; } }

/* ===== フッター ===== */
.site-footer { margin-top: 6rem; background: var(--forest); color: #cfe3d5; }
.site-footer .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1.2rem; flex-wrap: wrap; padding-top: 2rem; padding-bottom: 2rem; font-size: .8rem; }
.site-footer .logo { background: #fff; padding: 6px 10px; border-radius: 2px; }
.site-footer .logo img { height: 40px; width: auto; }

/* ===== ページ分割に伴う追加 ===== */
.gnav a[aria-current="page"] { background: var(--mint); color: var(--forest); font-weight: 600; }
.subpage main section { padding-top: 3.5rem; }
.more { margin: 1.4rem 0 0; }
.more a { font-weight: 600; }
.ev-empty { display: block !important; color: var(--muted); }

/* ===== イベント更新（管理者用） ===== */
.ev-tools { display: flex; gap: .5rem; margin-top: .8rem; }
.btn, .btn-plain { font: inherit; font-size: .9rem; cursor: pointer; border-radius: 4px; padding: .4rem 1rem; }
.btn { background: var(--forest); color: #fff; border: 1px solid var(--forest); }
.btn:hover { background: var(--moss); border-color: var(--moss); }
.btn-plain { background: #fff; color: var(--moss); border: 1px solid var(--line); }
.btn-plain:hover { border-color: var(--leaf); }
.btn-plain.danger { color: #b3261e; }
.btn:focus-visible, .btn-plain:focus-visible, .admin-link:focus-visible,
.ev-editor input:focus-visible, .ev-editor textarea:focus-visible, .ev-login input:focus-visible { outline: 3px solid var(--gal); outline-offset: 2px; }
.admin-area { margin-top: 3rem; }
.admin-link { font: inherit; font-size: .8rem; color: var(--muted); background: none; border: 0; padding: 0; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.ev-login { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem; margin-top: .6rem; }
.ev-login input { font: inherit; padding: .35rem .7rem; border: 1px solid var(--line); border-radius: 4px; }
.ev-msg { margin: 0; width: 100%; font-size: .85rem; color: #b3261e; min-height: 1.2em; }
.ev-editor { background: var(--mint); border-left: 3px solid var(--forest); padding: 1.4rem 1.5rem 1.2rem; margin: 0 0 2.2rem; }
.ev-editor-title { margin: 0 0 1rem; font-family: var(--mincho); font-weight: 500; font-size: 1.2rem; color: var(--forest); letter-spacing: .08em; }
.ev-row { display: grid; grid-template-columns: 9rem 1fr; gap: .4rem 1rem; align-items: start; margin-bottom: .9rem; }
.ev-row label { font-size: .9rem; color: var(--forest); padding-top: .35rem; }
.ev-row input[type="date"], .ev-row input[type="text"], .ev-row textarea { font: inherit; font-size: .95rem; padding: .4rem .7rem; border: 1px solid var(--line); border-radius: 4px; background: #fff; color: var(--ink); width: 100%; max-width: 38rem; }
.ev-row input[type="date"] { width: auto; }
.ev-row textarea { resize: vertical; line-height: 1.7; }
.ev-photo { display: flex; align-items: flex-end; gap: 1rem; margin: -.3rem 0 .9rem 10rem; }
.ev-photo img { max-width: 180px; max-height: 180px; width: auto; border-radius: 2px; background: #fff; }
.ev-actions { display: flex; gap: .6rem; margin-left: 10rem; }
.ev-publish { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1rem; margin-top: 1.4rem; padding-top: 1.1rem; border-top: 1px solid var(--line); }
.ev-status { margin: 0; flex: 1 1 18rem; font-size: .88rem; color: var(--ink); }
.ev-status.warn { color: #8a5a00; font-weight: 600; }
@media (max-width: 640px) {
  .ev-row { grid-template-columns: 1fr; }
  .ev-row label { padding-top: 0; }
  .ev-photo, .ev-actions { margin-left: 0; }
}

/* ===== 研究内容（tousa1） ===== */
.rs-intro { position: relative; background: var(--forest); color: #fff; margin: 0 0 4.5rem; padding: 3.2rem clamp(1.5rem, 5vw, 4rem) 2.8rem; border-radius: 2px; overflow: hidden; }
.rs-intro::after { content: ""; position: absolute; right: -60px; top: -60px; width: 240px; height: 240px; border-radius: 50%; border: 1px solid rgba(185, 216, 194, .25); box-shadow: 0 0 0 40px rgba(185, 216, 194, .05), 0 0 0 80px rgba(185, 216, 194, .03); pointer-events: none; }
.rs-lead { position: relative; margin: 0; max-width: 20em; font-family: var(--mincho); font-weight: 500; font-size: clamp(1.45rem, 3.2vw, 2.25rem); line-height: 1.75; letter-spacing: .06em; }
.rs-summary { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; margin-top: 2.4rem; padding-top: 1.6rem; border-top: 1px solid rgba(185, 216, 194, .35); }
.rs-summary .ja { margin: 0; font-size: 1rem; line-height: 2; color: #e3efe6; border-left: 3px solid var(--gal); padding-left: 1rem; }
.rs-summary .en-text { margin: 0; font-family: var(--latin); font-size: .95rem; line-height: 1.8; color: #b9d8c2; }

.rs-theme { display: grid; grid-template-columns: 17rem 1fr; gap: 3rem; padding: 3rem 0; border-top: 1px solid var(--line); }
.rs-theme:last-child { border-bottom: 1px solid var(--line); }
.rs-head { align-self: start; position: sticky; top: 100px; }
.rs-head .sym { width: 18px; height: 18px; }
.rs-head h2 { margin: 1rem 0 .5rem; font-family: var(--mincho); font-weight: 500; font-size: 1.45rem; line-height: 1.6; letter-spacing: .08em; color: var(--forest); }
.rs-en { margin: 0; font-family: var(--latin); font-size: .9rem; color: var(--muted); letter-spacing: .03em; }
.rs-body { max-width: 40em; }
.rs-body > p { margin: 0 0 1.5em; font-size: 1.02rem; line-height: 2.1; text-indent: 1em; }
.rs-body > p:last-child { margin-bottom: 0; }

.rs-figure { margin: 2.2rem 0 2.4rem; }
.rs-figure img { width: 100%; height: auto; border-radius: 2px; background: var(--mint); }
.rs-figure figcaption { margin-top: .7rem; font-size: .88rem; line-height: 1.8; color: var(--muted); }
.nowrap { white-space: nowrap; }

@media (max-width: 860px) {
  .rs-theme { grid-template-columns: 1fr; gap: 1.2rem; padding: 2.4rem 0; }
  .rs-head { position: static; display: flex; flex-wrap: wrap; align-items: center; gap: .2rem .8rem; }
  .rs-head h2 { margin: 0; }
  .rs-en { width: 100%; }
}
@media (max-width: 640px) {
  .rs-summary { grid-template-columns: 1fr; gap: 1.2rem; }
}
/* 日本語の見出しを文節の切れ目で改行する（対応ブラウザのみ） */
.rs-lead, .rs-head h2 { word-break: auto-phrase; }

/* ===== トップ：学生のみなさんへ ===== */
.msg { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
.msg-lead { margin: 0; font-family: var(--mincho); font-size: 1.35rem; line-height: 2; color: var(--ink); }
.msg-body p { margin: 0 0 1.4em; color: var(--ink); font-size: 1rem; line-height: 2; text-indent: 1em; }
.msg-body p:last-child { margin-bottom: 0; }
@media (max-width: 760px) { .msg { grid-template-columns: 1fr; gap: 1.2rem; } .msg-lead { font-size: 1.15rem; } }
@media (max-width: 480px) {
  .sec-head h1, .sec-head h2 { font-size: 1.5rem; white-space: nowrap; }
  .sec-head .en { white-space: nowrap; font-size: .85rem; }
}