:root{
  --bg:#0b0b0b;
  --fg:#f7f7f7;
  --muted:#b5b5b5;
  --accent:#ffd400; /* yellow */
  --card:#111;
  --border:#222;
  --container:1100px;
  --radius:12px;
  --space-1:6px; --space-2:10px; --space-3:16px; --space-4:24px; --space-5:36px; --space-6:56px;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--fg);
  font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  line-height:1.7;
}

.container{max-width:var(--container); margin:0 auto; padding:0 var(--space-4);}

.site-header{
  position:sticky; top:0; z-index:10;
  background:rgba(0,0,0,0.7); backdrop-filter:saturate(1.2) blur(6px);
  border-bottom:1px solid var(--border);
}
.site-header .container{display:flex; align-items:center; justify-content:space-between; padding:var(--space-3) var(--space-4);}
.brand{display:flex; align-items:center; gap:var(--space-2); color:var(--fg); text-decoration:none; font-weight:800; letter-spacing:0.5px;}
.nav a{color:var(--fg); text-decoration:none; margin-left:var(--space-4);}
.nav a.cta{padding:6px 12px; border:1px solid var(--accent); border-radius:8px;}
.nav a:hover{color:var(--accent)}

.hero{padding:var(--space-6) 0 var(--space-6);}
h1{font-size:clamp(28px, 4vw, 44px); line-height:1.2; margin:0 0 var(--space-3);}
h2{font-size:clamp(22px, 3vw, 28px); margin:var(--space-6) 0 var(--space-2);}
.lead{font-size:18px; color:var(--muted);}

.btn{
  display:inline-block; border-radius:10px; padding:10px 16px; text-decoration:none;
  background:var(--accent); color:#111; font-weight:700; border:1px solid transparent;
}
.btn.ghost{background:transparent; color:var(--fg); border-color:var(--border)}
.btn.small{padding:6px 10px; font-size:14px}

.section{padding:var(--space-4) 0 var(--space-6); border-top:1px solid var(--border)}
.grid{display:grid; grid-template-columns:repeat(auto-fit, minmax(260px, 1fr)); gap:var(--space-4);}
.card{background:var(--card); border:1px solid var(--border); border-radius:var(--radius); overflow:hidden;}
.thumb{aspect-ratio:16/9; background:#0e0e0e; border-bottom:1px solid var(--border);}
.skeleton{
  background-image: linear-gradient(90deg, #0d0d0d 25%, #1a1a1a 37%, #0d0d0d 63%);
  background-size: 400% 100%; animation: shine 1.2s infinite linear;
}
@keyframes shine{0%{background-position: 100% 0}100%{background-position: 0 0}}
.card-body{padding:var(--space-3) var(--space-4);}
.card-actions{display:flex; gap:var(--space-2); margin-top:var(--space-2);}
.tags{display:flex; gap:8px; flex-wrap:wrap; padding-left:0; list-style:none;}
.tags li{border:1px solid var(--border); padding:4px 10px; border-radius:999px; font-size:12px; color:var(--muted)}

.site-footer{border-top:1px solid var(--border); padding:var(--space-4) 0; color:var(--muted); font-size:14px}

@media (max-width:640px){
  .nav a{margin-left:var(--space-2)}
}
.muted { color: var(--muted); }
.card.wip { opacity: 0.9; }
.card.wip .btn[aria-disabled="true"] { opacity: 0.6; pointer-events: none; cursor: not-allowed; }

:root{
  --muted:#8b8b8b; /* 既にあればこのままでOK */
}

.tags{
  display:flex; gap:8px; flex-wrap:wrap; padding:0; margin:12px 0 0;
  list-style:none;
}
.tags li{
  border:1px solid var(--border, #e5e5e5);
  padding:2px 8px; border-radius:999px; font-size:0.9rem;
}

nav a.active{
  font-weight:700;
  text-decoration:underline;
  text-underline-offset: 3px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
}

.thumb img {
  width: 100%;
  display: block;
  border-radius: 8px;
}

.nav{display:flex; gap:16px; list-style:none; padding:12px 0; margin:0;}
.nav-link{padding:4px 6px; text-decoration:none;}
.nav-link.active{font-weight:700; text-decoration:underline; text-underline-offset:3px;}

.footer{border-top:1px solid var(--border,#e5e5e5); margin-top:40px; padding-top:12px;}

img{max-width:100%; height:auto;}
img[loading="lazy"]{content-visibility:auto;}