@charset "utf-8";
/* =========================================================
   style.css ― トップページ固有のスタイル
   （共通土台は common.css。本ファイルはTOP専用）
   ========================================================= */

/* ---------- ヒーロー（全面：水面＋水滴の着水→オレンジのエネルギー） ---------- */
.hero{position:relative;width:100%;min-height:min(920px,94vh);overflow:hidden;background:#9fdcee;}
.hero__video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block;z-index:0;}
.hero__canvas{position:absolute;inset:0;width:100%;height:100%;display:block;z-index:2;}
.hero__overlay{position:absolute;inset:0;z-index:1;pointer-events:none;
  background:
    linear-gradient(90deg,rgba(244,252,255,.62) 0%,rgba(244,252,255,.26) 34%,rgba(244,252,255,.04) 62%,rgba(244,252,255,0) 100%),
    linear-gradient(0deg,rgba(238,250,255,.5) 0%,rgba(238,250,255,0) 30%),
    linear-gradient(180deg,rgba(255,255,255,.32) 0%,rgba(255,255,255,0) 22%);}
.hero__inner{position:relative;z-index:3;max-width:var(--maxw);margin-inline:auto;
  min-height:min(920px,94vh);display:flex;align-items:flex-end;
  padding:calc(var(--header-h) + 8vh) var(--gut) clamp(48px,9vh,104px);}
.hero__copy{max-width:min(900px,86%);color:var(--navy);
  animation:heroIn 1s var(--ease) both;}
.hero__copy .hero__title{animation:heroIn 1s var(--ease) .12s both;}
.hero__copy .hero__tagline{animation:heroIn 1s var(--ease) .24s both;}
@keyframes heroIn{from{opacity:0;transform:translateY(22px);}to{opacity:1;transform:none;}}
@media (prefers-reduced-motion:reduce){.hero__copy,.hero__copy .hero__title,.hero__copy .hero__tagline{animation:none;}}
.hero__affil{display:block;font-family:var(--en);font-size:clamp(13px,1.4vw,18px);
  font-weight:700;letter-spacing:.16em;text-transform:uppercase;
  color:#2767a0;margin-bottom:24px;}
.hero__title{font-family:var(--en);font-weight:900;
  font-size:clamp(46px,8.6vw,116px);line-height:.98;letter-spacing:-.015em;color:var(--navy);
  text-shadow:0 2px 26px rgba(255,255,255,.5);}
.hero__title .accent{color:var(--energy);
  text-shadow:0 0 34px rgba(255,125,26,.4);}
.hero__tagline{margin-top:30px;color:#1f4d72;
  font-size:clamp(15px,1.7vw,20px);letter-spacing:.04em;}
.hero__scroll{position:absolute;left:var(--gut);bottom:24px;z-index:2;font-family:var(--en);
  font-size:11px;font-weight:700;letter-spacing:.24em;color:rgba(20,70,110,.7);writing-mode:vertical-rl;}
.hero__scroll::after{content:"";display:block;width:1px;height:46px;background:rgba(20,70,110,.55);
  margin:10px auto 0;animation:scrollline 2.2s var(--ease) infinite;}
@keyframes scrollline{0%{transform:scaleY(0);transform-origin:top;}45%{transform:scaleY(1);transform-origin:top;}
  55%{transform:scaleY(1);transform-origin:bottom;}100%{transform:scaleY(0);transform-origin:bottom;}}

/* ---------- 数値ストリップ ---------- */
.stats{border-block:1px solid var(--line);}
.stats__inner{display:grid;grid-template-columns:repeat(3,1fr);max-width:var(--wrapw);margin-inline:auto;}
.stat{padding:clamp(26px,4vw,40px) var(--gut);text-align:center;border-left:1px solid var(--line);}
.stat:first-child{border-left:0;}
.stat b{display:block;font-family:var(--en);font-size:clamp(28px,4.5vw,44px);font-weight:700;line-height:1;letter-spacing:-.01em;}
.stat b i{font-style:normal;font-size:.5em;font-weight:600;margin-left:.2em;color:var(--ink-2);}
.stat small{display:block;font-size:12px;color:var(--ink-2);margin-top:10px;letter-spacing:.04em;}

/* ---------- 研究テーマ（左：写真／右：開閉カード＋元素ハニカム背景） ---------- */
/* レビューコメント #2168 反映：section#themes の上下padding 104→180px */
.themes-sec{position:relative;overflow:hidden;padding-block:clamp(100px,13vw,180px);}
.themes-bg{position:absolute;inset:0;z-index:0;pointer-events:none;
  background:url("../img/hex-bg.svg") left -60px top -20px / auto 118% no-repeat;
  opacity:.5;-webkit-mask-image:linear-gradient(90deg,#000 0%,#000 52%,transparent 100%);
  mask-image:linear-gradient(90deg,#000 0%,#000 52%,transparent 100%);}
.themes-sec > .wrap{position:relative;z-index:1;}
/* 左：見出し＋カード／右：写真（見出しの頭に揃え、80px上にはみ出す） */
.themes-layout{display:grid;grid-template-columns:1.16fr 0.84fr;gap:clamp(28px,4vw,60px);
  align-items:start;}
.themes-main{min-width:0;}
.themes-main .sec-head{margin-bottom:0;}
.themes-cards{display:flex;flex-direction:column;gap:18px;margin-top:clamp(26px,3.5vw,44px);}
.themes-photo{margin-top:-80px;border-radius:18px;overflow:hidden;aspect-ratio:3/4;
  box-shadow:0 24px 60px rgba(20,70,120,.16);}
.themes-photo img{width:100%;height:100%;object-fit:cover;}
.tcard{background:#fff;border:1px solid var(--line-2);border-radius:18px;overflow:hidden;
  box-shadow:0 12px 32px rgba(20,60,110,.07);transition:box-shadow .3s var(--ease),transform .3s var(--ease);}
.tcard:hover{box-shadow:0 18px 44px rgba(20,60,110,.12);transform:translateY(-2px);}
.tcard__head{display:flex;align-items:center;gap:clamp(14px,2vw,24px);width:100%;
  padding:clamp(18px,2.2vw,26px) clamp(18px,2vw,28px);text-align:left;}
.tcard__icon{width:clamp(46px,4vw,58px);height:clamp(46px,4vw,58px);border-radius:50%;flex:none;
  background:radial-gradient(circle at 35% 30%,#eaf4fb,#dbeaf6);
  display:flex;align-items:center;justify-content:center;}
.tcard__icon img{width:30px;height:30px;}
.tcard__title{flex:1;font-size:clamp(16px,1.7vw,20px);font-weight:700;color:var(--navy);line-height:1.4;}
.tcard__title small{display:block;font-family:var(--en);font-size:11px;font-weight:700;
  letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3);margin-top:3px;}
.tcard__toggle{flex:none;width:54px;height:38px;border-radius:999px;color:#fff;font-size:22px;
  font-weight:300;line-height:1;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#2f7fd6 0%,#36b58a 100%);box-shadow:0 6px 14px rgba(47,127,214,.3);
  transition:transform .35s var(--ease);}
.tcard.is-open .tcard__toggle{transform:rotate(135deg);}
.tcard__body{max-height:0;overflow:hidden;transition:max-height .4s var(--ease);}
.tcard__body p{margin:0;padding:0 clamp(18px,2vw,28px) clamp(20px,2.2vw,26px)
  calc(clamp(46px,4vw,58px) + clamp(14px,2vw,24px) + clamp(18px,2vw,28px));
  color:var(--ink-2);font-size:14.5px;line-height:1.9;}

/* ---------- コンセプト（split） ---------- */
.concept .wrap{display:grid;grid-template-columns:.92fr 1.08fr;gap:clamp(32px,5vw,72px);align-items:center;}
.concept__media{aspect-ratio:4/5;border-radius:14px;}
.concept__title{font-size:clamp(15px,1.7vw,19px);line-height:1.6;font-weight:700;color:#2b333a;letter-spacing:.02em;}
.concept__title em{font-style:normal;border-bottom:2px solid var(--brand);padding-bottom:1px;}
.concept__lead{margin-top:24px;}
.concept__flow{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:30px;
  font-size:13px;color:var(--ink-2);}
.concept__flow span{border:1px solid var(--line);border-radius:999px;padding:8px 16px;background:#fff;}
.concept__flow .sep{border:0;padding:0;color:var(--ink-3);}

/* ---------- 学ぶ（ゲートウェイ） ---------- */
.learn-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.gate{display:flex;align-items:center;gap:18px;padding:22px 24px;border:1px solid var(--line);
  border-radius:var(--radius);background:#fff;transition:.35s var(--ease);}
.gate:hover{border-color:var(--ink);transform:translateY(-3px);}
.gate__no{font-family:var(--en);font-size:22px;font-weight:700;color:var(--line);flex:none;width:42px;}
.gate:hover .gate__no{color:var(--ink);}
.gate__txt b{display:block;font-size:16px;font-weight:700;}
.gate__txt span{font-size:12.5px;color:var(--ink-2);}
.gate__arw{margin-left:auto;color:var(--ink-3);transition:transform .3s var(--ease);}
.gate:hover .gate__arw{transform:translateX(4px);color:var(--ink);}

/* ---------- ビジョン（split 反転） ---------- */
.vision .wrap{display:grid;grid-template-columns:1.08fr .92fr;gap:clamp(32px,5vw,72px);align-items:center;}
.vision__media{aspect-ratio:16/11;border-radius:14px;}
.roadmap{margin-top:30px;display:flex;flex-direction:column;gap:0;}
.roadmap li{display:grid;grid-template-columns:96px 1fr;gap:18px;padding:18px 0;border-top:1px solid var(--line);align-items:baseline;}
.roadmap li:last-child{border-bottom:1px solid var(--line);}
.roadmap .yr{font-family:var(--en);font-size:18px;font-weight:700;letter-spacing:.02em;}
.roadmap .desc{font-size:14px;color:var(--ink-2);line-height:1.8;}

/* ---------- News & Publications ---------- */
.np-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap;
  margin-bottom:32px;}
.np-list{border-top:1px solid var(--line);}
.np-item{display:grid;grid-template-columns:120px 110px 1fr auto;gap:20px;align-items:center;
  padding:20px 6px;border-bottom:1px solid var(--line);transition:background .3s var(--ease);}
.np-item:hover{background:var(--bg-2);}
.np-item time{font-family:var(--en);font-size:13px;color:var(--ink-2);letter-spacing:.04em;}
.np-cat{justify-self:start;font-size:11px;letter-spacing:.08em;border:1px solid var(--line);
  border-radius:999px;padding:4px 12px;color:var(--ink-2);}
.np-item h4{font-size:15px;font-weight:500;}
.np-item .arw{color:var(--ink-3);}

/* ---------- 学生帯 ---------- */
.students{background:var(--bg-3);color:#fff;}
.students .wrap{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,4vw,56px);align-items:center;}
/* 学生帯は暗背景：見出しグラデを明るく、サブタイトルは白 */
.students .eyebrow{background:linear-gradient(95deg,#bfe7f6 0%,#7fb9da 45%,#dfeef7 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;}
.students__title{font-size:clamp(15px,1.7vw,19px);font-weight:700;line-height:1.6;color:#fff;letter-spacing:.02em;}
.students__lead{color:#b4b4b4;margin-top:20px;line-height:2;}
.students .btn{border-color:#fff;color:#fff;background:transparent;}
.students .btn:hover{background:#fff;color:var(--ink);}
.students .btn--primary{background:#fff;color:var(--ink);}
.students__media{aspect-ratio:4/3;border-radius:14px;border-color:#2c2c2c;background:#1c1c1c;}

/* ---------- CTAバンド ---------- */
.cta{text-align:center;}
.cta__inner{max-width:720px;margin-inline:auto;}
.cta h2{font-size:clamp(15px,1.7vw,19px);font-weight:700;line-height:1.6;color:#2b333a;letter-spacing:.02em;}
.cta p{color:var(--ink-2);margin-top:14px;margin-bottom:32px;}

/* ---------- レスポンシブ（TOP固有） ---------- */
@media (max-width:900px){
  .hero{min-height:min(760px,90vh);}
  .hero__inner{min-height:min(760px,90vh);}
  .hero__scroll{display:none;}
  .themes-layout{grid-template-columns:1fr;}
  .themes-photo{order:-1;margin-top:0;aspect-ratio:16/9;max-height:340px;}
  .concept .wrap,.vision .wrap,.students .wrap{grid-template-columns:1fr;}
  .concept__media{aspect-ratio:16/10;order:-1;}
  .learn-grid{grid-template-columns:1fr;}
  .np-item{grid-template-columns:96px 1fr;grid-template-areas:"time cat" "title title";row-gap:8px;}
  .np-item time{grid-area:time;} .np-cat{grid-area:cat;justify-self:end;}
  .np-item h4{grid-area:title;} .np-item .arw{display:none;}
}
@media (max-width:560px){
  .stats__inner{grid-template-columns:1fr;}
  .stat{border-left:0;border-top:1px solid var(--line);}
  .stat:first-child{border-top:0;}
  .tcard__body p{padding-left:clamp(18px,2vw,28px);}
  .roadmap li{grid-template-columns:1fr;gap:4px;}
}