/* ========= Base ========= */
:root{
  --bg: #0f1220;
  --panel: #171a2a;
  --ink: #e9ecff;
  --muted: #b9bfe6;
  --accent: #7aa2ff;
  --accent-2:#9bffde;
  --pink: #ff7ad9;
  --ok:#6bff9b;
  --bad:#ff7a7a;
  --card:#1c2034;
  --border:#2a2f4a;
}

* { box-sizing: border-box; }
html, body { margin:0; padding:0; }
body{
  font-family: 'Segoe UI', 'Hiragino Kaku Gothic ProN', system-ui, sans-serif;
  background: radial-gradient(1200px 800px at 10% -10%, #1c2344 0%, var(--bg) 50%);
  color: var(--ink);
  line-height: 1.85;
}

a{ color: var(--accent); text-decoration: none; }
a:hover{ text-decoration: underline; }

/* ========= Layout ========= */
.site-header{
  position: sticky; top:0; z-index: 10;
  background: rgba(15,18,32,0.85);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
  padding: .75rem 1rem;
}
.brand{ font-weight: 600; }
.brand a{ color: var(--ink); }
.sep{ margin: 0 .4rem; color: var(--muted); }

.top-nav{
  display: flex; gap: .8rem; margin-top: .4rem; flex-wrap: wrap;
}
.top-nav a{
  background: var(--panel);
  border: 1px solid var(--border);
  padding: .35rem .7rem; border-radius: .6rem;
  color: var(--muted);
}
.top-nav a:hover{ color: var(--ink); background: #20253b; }

#main{
  max-width: 980px; margin: 2rem auto; padding: 0 1rem 4rem;
}

/* ========= TOC ========= */
#toc{
  position: fixed; right: 18px; top: 110px; width: 260px;
  max-height: calc(100vh - 140px); overflow: auto;
  padding: 1rem;
  background: rgba(23,26,42,0.92);
  border: 1px solid var(--border);
  border-radius: .8rem;
  box-shadow: 0 8px 24px rgba(0,0,0,0.25);
}
#toc h2{ font-size: 15px; margin: 0 0 .5rem; color: var(--muted); }
#toc ul{ list-style: none; padding: 0; margin: 0; }
#toc li{ margin: .25rem 0; }
#toc a{
  display: block; padding: .25rem .4rem; border-radius: .4rem; color: var(--muted);
}
#toc a:hover{ background: #222948; color: var(--ink); }

/* small viewportでTOCを下に回す */
@media (max-width: 1200px){
  #toc{ position: static; width: auto; max-height: none; margin: 1rem auto; }
}

/* ========= Hero ========= */
.hero{
  background: linear-gradient(135deg, #181c33 0%, #121527 60%);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.2rem 1.2rem 1rem;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04), 0 12px 36px rgba(0,0,0,0.28);
}
h1{ margin: .2rem 0 .4rem; font-size: clamp(1.6rem, 2.2vw, 2rem); }
.lede{ color: var(--muted); }
.meta{ color: var(--muted); font-size: .92rem; margin-top: .4rem; }
.quick-actions{ display: flex; gap: .5rem; margin-top: .8rem; flex-wrap: wrap; }
.quick-actions button, .quick-actions input{
  border-radius: .6rem; border: 1px solid var(--border);
  background: var(--panel); color: var(--ink);
  padding: .5rem .7rem;
}
.quick-actions input{ min-width: 260px; }

/* ========= Cards / Grid ========= */
.grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: .8rem; margin-top: .8rem;
}
.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: .8rem;
  padding: .8rem .9rem;
}

/* ========= Sections ========= */
section{ margin: 2rem 0; }
h2{
  margin: 0 0 .6rem;
  font-size: clamp(1.2rem, 1.6vw, 1.4rem);
  border-bottom: 1px dashed #2f3863;
  padding-bottom: .35rem;
}

/* ========= Tabs ========= */
.code-tabs{ margin-top: .6rem; }
.tablist{ display: flex; gap: .35rem; flex-wrap: wrap; margin-bottom: .5rem; }
[role="tab"]{
  background: #212642; color: var(--muted);
  border: 1px solid var(--border);
  border-radius: .6rem; padding: .35rem .6rem; cursor: pointer;
}
[role="tab"][aria-selected="true"]{ color: var(--ink); outline: 2px solid #2d3a7c; }
.panels .panel{
  background: #101427;
  border: 1px solid var(--border);
  border-radius: .6rem;
  overflow: auto; padding: .8rem; margin: 0;
}
.panels .hidden{ display: none; }
pre{ margin: .6rem 0; }
code{ font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .92rem; }

/* ========= Mini Runner ========= */
.mini-runner{
  background: #111531; border: 1px solid var(--border);
  border-radius: .8rem; padding: .8rem; display: grid; gap: .6rem;
}
#codeArea{
  width: 100%; min-height: 160px;
  background: #0e132b; color: var(--ink);
  border: 1px solid var(--border); border-radius: .6rem; padding: .6rem;
}
#tests{
  background: #0e132b; color: var(--muted);
  border: 1px dashed #2b3464; border-radius: .6rem; padding: .6rem; margin: 0;
}
.runner-actions{ display: flex; gap: .5rem; }
.runner-actions button{
  background: #20264a; color: var(--ink);
  border: 1px solid var(--border); border-radius: .6rem; padding: .5rem .7rem; cursor: pointer;
}
.runner-actions button:hover{ background: #273062; }
#runnerOut{
  background: #0b0f24; border: 1px solid var(--border); border-radius: .6rem;
  padding: .6rem; min-height: 44px;
}
#runnerOut div{ margin: .1rem 0; }
#runnerOut div:first-child{ color: var(--accent-2); }

/* ========= News ========= */
.news{ list-style: none; padding: 0; margin: .6rem 0 0; }
.news li{
  background: #141937; border: 1px solid var(--border);
  border-radius: .6rem; padding: .6rem .7rem; margin-bottom: .5rem;
}
.news time{ color: var(--muted); margin-right: .4rem; display: inline-block; }

/* ========= Footer ========= */
.site-footer{
  max-width: 980px; margin: 2rem auto; padding: 0 1rem 2rem; color: var(--muted);
}
.site-footer details{
  background: #11162a; border: 1px solid var(--border); border-radius: .8rem; padding: .6rem .8rem;
}
.footer-links{ list-style: none; padding: 0; margin: .4rem 0 0; display: flex; gap: .8rem; flex-wrap: wrap; }
.footer-links a{ color: var(--ink); }
.footer-links a:hover{ text-decoration: underline; }

footer ul {
  list-style:none; padding:0; margin:1rem 0 0;
  display:flex; flex-wrap:wrap; gap:.5rem;
}
footer ul li{
  margin:0; padding:.2rem .4rem;
  background: var(--panel); border-radius:8px;
  border:1px solid #232848;
}