:root{
  --brand:#00A3E0; /* PANTONE 299C 近似 */
  --ink:#2b2b2b;
  --muted:#6b7280;
  --line:#e5e7eb;
  --bg:#fafafa;
  --card:#fff;
  --radius:16px;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;color:var(--ink);background:var(--bg);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;
  line-height:1.6}
a{color:inherit;text-decoration:none}
a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid #9bdcf4;outline-offset:2px}
img{max-width:100%;height:auto;display:block}
.small-muted{font-size:12px;color:var(--muted)}

/* Header */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.header-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;gap:16px;padding:12px 16px}
.header-brand{display:flex;align-items:center;gap:14px}
.site-actions{margin-left:auto;display:flex;align-items:center;gap:12px}
.btn{display:inline-flex;align-items:center;gap:.5em;border:1px solid var(--brand);color:#fff;background:var(--brand);padding:.55em .9em;border-radius:999px;font-weight:600;font-size:14px}
.btn.outline{color:var(--brand);background:transparent}
.search{position:relative}
.search input{width:260px;max-width:40vw;border:1px solid var(--line);border-radius:999px;padding:.55em 2.2em .55em .9em;font-size:14px;background:#fff}
.search-icon{position:absolute;right:8px;top:50%;transform:translateY(-50%);width:20px;height:20px;opacity:.6}

/* Hero */
.hero{background:#fff}
.hero-inner{max-width:1200px;margin:0 auto;padding:28px 16px;display:grid;grid-template-columns:1fr auto;align-items:center;gap:16px}
.hero-title{font-size:28px;font-weight:800;letter-spacing:.02em}
.hero-sub{color:var(--muted)}
.hero-logo{width:130px}
.hero-logo img { width:100%; height:auto; display:block; }

/* Tabs */
.tabs{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.tabs-inner{max-width:1200px;margin:0 auto;padding:6px 8px;display:flex;flex-wrap:wrap;gap:6px;overflow-x:auto;scrollbar-width:thin}
.tabs-inner::-webkit-scrollbar{height:8px}
.tabs-inner::-webkit-scrollbar-thumb{background:#e5e7eb;border-radius:8px}
.tab{display:inline-block;padding:10px 14px;border-radius:999px;font-weight:600;white-space:nowrap}
.tab:hover{background:#f3f4f6}

/* Main */
main{max-width:1200px;margin:0 auto;padding:28px 16px}
section{margin:32px 0}
.section-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:14px;gap:12px}
.section-head h2{font-size:22px;margin:0}
.more{font-weight:700;color:var(--brand)}

/* Cards / grids */
.grid{display:grid;gap:18px}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}
.card-thumb{aspect-ratio:16/9;background:#eef6fb}
.card-body{padding:12px 14px 14px}
.card-title{font-size:16px;font-weight:700;margin:0 0 .4rem}
.meta{font-size:12px;color:var(--muted);display:flex;gap:8px;flex-wrap:wrap}
.badge{font-size:12px;color:var(--brand);font-weight:700}

/* Category */
.category-list{display:grid;gap:14px;grid-template-columns:repeat(3,1fr)}
.category{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:14px}
.category h3{margin:.2rem 0 .5rem;font-size:16px}
.category a.more{display:inline-block;margin-top:.3rem}

/* Tag */
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
.tag{border:1px solid var(--line);background:#fff;border-radius:999px;padding:.35em .8em;font-size:13px}

/* Footer */
.site-footer{background:#fff;border-top:1px solid var(--line)}
.footer-inner{max-width:1200px;margin:0 auto;padding:22px 16px;display:grid;gap:12px}
.f-row{display:flex;flex-wrap:wrap;gap:18px;align-items:center}
.address{font-size:13px;color:var(--muted)}
.social a{display:inline-flex;align-items:center;gap:8px;margin-right:12px}

/* Skeleton shimmer */
@keyframes shimmer{0%{background-position:-200px 0}100%{background-position:200px 0}}
.skel .card-thumb{background:linear-gradient(90deg,#f2f4f7 25%,#e9eef5 37%,#f2f4f7 63%);background-size:400% 100%;animation:shimmer 1.4s infinite}
.skel .meta,
.skel .line{background:#eef2f7;border-radius:6px}
.skel .line{height:1.1rem;margin:.4rem 0 .6rem}
.skel .line.sm{height:.9rem;width:70%}

/* ====== Responsive ====== */
@media (max-width: 1200px){
  .grid.cols-4{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
  .grid.cols-3{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
  .category-list{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
}
@media (max-width: 960px){
  .search input{width:220px}
  .hero-inner{grid-template-columns:1fr;gap:8px}
  .hero-logo{order:-1;justify-self:start}
}
@media (max-width: 720px){
  .site-actions{gap:8px}
  .btn{padding:.5em .8em;font-size:13px}
  .search input{width:46vw}
  .grid.cols-4{grid-template-columns:repeat(2,1fr)}
  .grid.cols-3{grid-template-columns:repeat(2,1fr)}
  .hero-logo { display:none; }
}
@media (max-width: 480px){
  .grid.cols-4,.grid.cols-3{grid-template-columns:1fr}
  .header-inner{gap:10px;padding:10px 12px}
  .hero-title{font-size:22px}
  main{padding:22px 12px}
}
@media (prefers-reduced-motion: reduce){
  .skel .card-thumb{animation:none}
}

/* ===== Filters / Chips ===== */
.filters{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 10px}
.chip{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:#fff;border-radius:999px;padding:.25rem .6rem;font-size:13px}
.chip .x{background:transparent;border:none;cursor:pointer;font-size:14px;line-height:1}
.chip .x:focus-visible{outline:2px solid #9bdcf4;border-radius:4px}

/* Category cards: count & active state */
.cat-head{display:flex;align-items:baseline;gap:8px}
.cat-count{font-size:12px;color:#64748b}
.category.is-active{outline:2px solid var(--brand); outline-offset:2px}

/* Tag pills: count & active state */
.tag{position:relative}
.tag .tag-count{font-size:11px;color:#64748b;margin-left:.25rem}
.tag.is-active{border-color:var(--brand);box-shadow:0 0 0 2px rgba(0,163,224,.15)}

/* ==== Compact header (スマホ最適化) ==== */
.header-inner img { height: 42px; width: auto; } /* PC基準 */
.site-actions { display:flex; align-items:center; gap:12px }
.icon-btn { display:none; border:1px solid var(--line); background:#fff; border-radius:999px; padding:6px; line-height:0 }
.icon-btn img { width:20px; height:20px; opacity:.75 }
.hide-sm { display:inline-flex } /* スマホで消す要素に付与 */

/* 検索パネルのデフォルト（PCは常に表示） */
.search { position:relative }
.search-panel { display:block } /* PCでは常時表示 */
.search-panel input{ width:260px; max-width:40vw; border:1px solid var(--line); border-radius:999px; padding:.55em 0.9em; font-size:14px; background:#fff }

/* ---- スマホ時のコンパクト指定 ---- */
@media (max-width: 720px){
  .header-inner { padding:10px 12px; gap:10px }
  .header-inner img { height: 34px }          /* ロゴ縮小 */
  .hide-sm { display:none }                    /* 「大学サイトへ」ボタン非表示（必要なら残してOK） */

  /* 検索はアイコンのみ → クリックで下に展開 */
  .icon-btn { display:inline-flex }
  .search-panel[hidden] { display:none !important }
  .search-panel {
    position:absolute; left:0; right:0; top:100%;
    padding:8px 12px; background:#fff; border-bottom:1px solid var(--line); z-index:60;
  }
  .search-panel input { width:100%; max-width:none }
}

.hero-v2{ position:relative; background:#000; }
.hero-v2 .hero-media{
  position:absolute; inset:0;
  background-image:var(--hero-img);
  background-size:cover; background-position:center;
  transform:translateZ(0);
}
.hero-v2::after{
  /* 画像の上にうっすら暗いグラデーション（下に向かって濃く） */
  content:""; position:absolute; inset:0;
  background:linear-gradient(180deg, rgba(0,0,0,var(--hero-dim,.12)) 0%,
                                      rgba(0,0,0,calc(var(--hero-dim,.12)+.16)) 55%,
                                      rgba(0,0,0,calc(var(--hero-dim,.12)+.30)) 100%);
}
.hero-v2 .overlay{
  position:relative; z-index:1;
  min-height:clamp(200px, 32vw, 420px);
  display:flex; align-items:end; justify-content:flex-start;
  padding: min(6vw, 40px) 16px;
}

/* テキストの下地（白ベース） */
.hero-copy{
  background:rgba(255,255,255,.88);
  -webkit-backdrop-filter:saturate(120%) blur(6px);
  backdrop-filter:saturate(120%) blur(6px);
  border-radius:16px;
  padding:14px 16px;
  box-shadow:0 8px 24px rgba(0,0,0,.14);
  max-width:min(900px, 92%);
}
.hero-title{ color:#111; font-weight:800; letter-spacing:.02em; margin:0 0 .25rem;
  font-size:clamp(20px, 3.2vw, 32px);
}
.hero-sub{ color:#3f3f3f; margin:0; font-size:clamp(12px, 1.8vw, 16px); }

/* ブランド色帯にしたい場合は .hero-copy に is-brand を付与 */
.hero-copy.is-brand{ background:rgba(0,163,224,.92); color:#fff; }
.hero-copy.is-brand .hero-title,
.hero-copy.is-brand .hero-sub{ color:#fff; }

/* スマホ：高さと画像差し替え、余白調整 */
@media (max-width: 720px){
  .hero-v2 .overlay{ min-height: clamp(160px, 44vw, 280px); padding: 16px 12px; }
  .hero-v2 .hero-media{ background-image:var(--hero-img-sm, var(--hero-img)); }
  .hero-copy{ padding:10px 12px; border-radius:12px; max-width:96%; }
}