/* =========================
   Programming Lab - Electron Doc Theme
========================= */
:root{
  --bg: #070b14;
  --bg2: #0b1220;
  --card: rgba(255,255,255,.06);
  --card2: rgba(255,255,255,.08);

  --primary: #38bdf8;      /* electric cyan */
  --primary2:#60a5fa;      /* soft blue */
  --accent: #22c55e;       /* success */
  --warn: #f59e0b;

  --text: #e5e7eb;
  --muted: rgba(229,231,235,.72);
  --border: rgba(148,163,184,.22);

  --radius: 18px;
  --shadow: 0 18px 46px rgba(0,0,0,.45);
}

[data-theme="light"]{
  --bg: #f4f7ff;
  --bg2:#ffffff;
  --card: #ffffff;
  --card2:#f7fbff;

  --text:#0f172a;
  --muted: rgba(15,23,42,.68);
  --border: rgba(148,163,184,.32);
  --shadow: 0 14px 34px rgba(15,23,42,.10);
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:"Noto Sans JP", system-ui, -apple-system, sans-serif;
  background:
    radial-gradient(1200px 680px at 10% -10%, rgba(56,189,248,.24), transparent 62%),
    radial-gradient(900px 520px at 90% 0%, rgba(96,165,250,.18), transparent 55%),
    radial-gradient(800px 520px at 50% 105%, rgba(34,197,94,.10), transparent 60%),
    linear-gradient(180deg, var(--bg), var(--bg2));
  color:var(--text);
  line-height:1.75;
}

/* =========================
   Topbar
========================= */
.topbar{
  position:sticky;
  top:0;
  z-index:50;
  backdrop-filter: blur(14px);
  background: linear-gradient(180deg, rgba(11,18,32,.92), rgba(11,18,32,.55));
  border-bottom: 1px solid var(--border);
}
[data-theme="light"] .topbar{
  background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.65));
}

.topbar__inner{
  max-width: 1200px;
  margin:0 auto;
  padding: .9rem 1rem;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 1rem;
}

.brand{
  display:flex;
  align-items:center;
  gap:.8rem;
}
.brand__badge{
  width:42px;height:42px;
  border-radius: 14px;
  display:grid; place-items:center;
  font-weight:900;
  letter-spacing:.04em;
  background: linear-gradient(135deg, rgba(56,189,248,.95), rgba(96,165,250,.65));
  color:#00111e;
  box-shadow: 0 12px 30px rgba(56,189,248,.22);
}
.brand__title{
  font-weight:900;
  font-size: 1.02rem;
  letter-spacing:.03em;
}
.brand__sub{
  font-size:.86rem;
  color: var(--muted);
}

.topbar__actions{
  display:flex;
  gap:.5rem;
  align-items:center;
}

.btn{
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: .55rem .85rem;
  cursor:pointer;
  transition: transform .12s ease, background .12s ease, border-color .12s ease;
}
.btn:hover{
  transform: translateY(-1px);
  background: var(--card2);
  border-color: rgba(56,189,248,.35);
}
.btn--ghost{
  background: transparent;
}

/* =========================
   Layout
========================= */
.layout{
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
  display:grid;
  grid-template-columns: 320px 1fr;
  gap: 1rem;
}

@media (max-width: 980px){
  .layout{ grid-template-columns: 1fr; }
  .sidebar{ position: static !important; }
}

.sidebar{
  position: sticky;
  top: 76px;
  height: fit-content;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255,255,255,.04);
  box-shadow: var(--shadow);
}
[data-theme="light"] .sidebar{ background: rgba(255,255,255,.85); }

.breadcrumb{
  font-size:.9rem;
  color: var(--muted);
  margin-bottom: .9rem;
  display:flex;
  flex-wrap:wrap;
  gap:.35rem;
  align-items:center;
}
.breadcrumb a{ color: var(--muted); text-decoration:none; }
.breadcrumb a:hover{ color: var(--primary); }
.breadcrumb__sep{ opacity:.6; }

.sidecard{
  padding: .95rem .95rem;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--card);
}
.sidecard__title{
  font-weight: 900;
  letter-spacing:.03em;
  margin-bottom: .35rem;
}
.sidecard__meta{ display:flex; flex-wrap:wrap; gap:.4rem; margin: .35rem 0 .65rem; }
.pill{
  font-size:.78rem;
  padding:.25rem .55rem;
  border-radius:999px;
  border:1px solid var(--border);
  background: rgba(255,255,255,.05);
  color: var(--muted);
}
.sidecard__desc{ margin: 0; color: var(--muted); }

.toc{ margin-top: .9rem; }
.toc__title{
  font-weight:900;
  margin:.95rem 0 .55rem;
  letter-spacing:.03em;
}
.toc__list{
  list-style:none;
  padding:0;
  margin:0;
  display:flex;
  flex-direction:column;
  gap:.2rem;
}
.toc__link{
  display:block;
  padding:.5rem .65rem;
  border-radius: 12px;
  text-decoration:none;
  color: var(--text);
  border: 1px solid transparent;
}
.toc__link:hover{
  background: rgba(56,189,248,.10);
  border-color: rgba(56,189,248,.25);
}
.toc__link.is-active{
  background: rgba(56,189,248,.16);
  border-color: rgba(56,189,248,.35);
}

.sidehint{
  margin-top: .9rem;
  padding:.9rem;
  border-radius: 16px;
  border: 1px dashed rgba(56,189,248,.35);
  background: rgba(56,189,248,.06);
}
.sidehint__title{ font-weight:900; margin-bottom:.2rem; }
.sidehint__body{ color: var(--muted); }

/* =========================
   Content
========================= */
.content{ min-width: 0; }

.hero{
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background:
    radial-gradient(900px 420px at 0% 0%, rgba(56,189,248,.18), transparent 60%),
    radial-gradient(900px 420px at 100% 0%, rgba(96,165,250,.14), transparent 55%),
    var(--card);
  box-shadow: var(--shadow);
}
.hero__inner{ padding: 1.25rem 1.25rem 1.1rem; }
.hero h1{
  margin:0 0 .35rem;
  font-size: 1.85rem;
  letter-spacing:.03em;
}
.lead{ margin:0; color: var(--muted); }

.hero__grid{
  margin-top: 1rem;
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .7rem;
}
@media (max-width: 700px){
  .hero__grid{ grid-template-columns: 1fr; }
}
.kpi{
  border: 1px solid var(--border);
  background: rgba(255,255,255,.04);
  border-radius: 16px;
  padding: .85rem;
}
.kpi__label{ font-size:.85rem; color: var(--muted); }
.kpi__value{ font-weight:900; margin-top:.2rem; letter-spacing:.02em; }

.card{
  margin-top: 1rem;
  padding: 1.1rem 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--card);
  box-shadow: var(--shadow);
}
.card h2{
  margin:0 0 .6rem;
  font-size: 1.25rem;
  letter-spacing:.02em;
}
.card h3{
  margin: 1.1rem 0 .35rem;
  font-size: 1.05rem;
}
.muted{ color: var(--muted); margin-top:.2rem; }

.nice-list{ margin:.4rem 0 0; padding-left: 1.1rem; }
.nice-list li{ margin:.25rem 0; }

.nice-list li a{ color: var(--text); text-decoration:none; border-bottom:1px dashed rgba(56,189,248,.35); }
.nice-list li a:hover{ color: var(--primary); }

.split{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: .8rem;
  margin-top:.8rem;
}
@media (max-width: 760px){
  .split{ grid-template-columns: 1fr; }
}
.panel{
  border: 1px solid var(--border);
  background: rgba(255,255,255,.04);
  border-radius: 16px;
  padding: .9rem;
}
.panel h3{ margin:0 0 .4rem; }
.mini{ margin:0; padding-left:1.1rem; color: var(--muted); }
.mini li{ margin:.22rem 0; }

.tagrow{
  display:flex;
  flex-wrap:wrap;
  gap:.45rem;
  margin-top: .7rem;
}
.tag{
  font-size:.85rem;
  padding:.35rem .6rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.05);
}

/* =========================
   Callout
========================= */
.callout{
  margin-top: .9rem;
  border-radius: 16px;
  border: 1px solid rgba(34,197,94,.30);
  background: rgba(34,197,94,.08);
  padding: .9rem;
}
.callout__title{
  font-weight:900;
  margin-bottom:.2rem;
}
.callout__body{ color: var(--muted); }

.callout--warn{
  border-color: rgba(245,158,11,.32);
  background: rgba(245,158,11,.10);
}

/* =========================
   Diagram
========================= */
.diagram{
  margin-top:.9rem;
  display:grid;
  grid-template-columns: 1fr auto 1fr;
  gap:.7rem;
  align-items:center;
}
@media (max-width: 760px){
  .diagram{ grid-template-columns: 1fr; }
  .diagram__arrow{ text-align:left; }
}
.diagram__box{
  border-radius: 16px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.04);
  padding: .9rem;
}
.diagram__title{ font-weight:900; margin-bottom:.2rem; }
.diagram__text{ color: var(--muted); }
.diagram__arrow{
  color: var(--primary);
  font-weight: 700;
  opacity:.95;
  text-align:center;
}

/* =========================
   Code blocks
========================= */
pre.code{
  position: relative;
  overflow:auto;
  padding: 1rem 1rem 1rem;
  margin: .55rem 0 0;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: rgba(0,0,0,.30);
}
[data-theme="light"] pre.code{
  background: #0b1220;
}
pre.code code{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: .88rem;
  line-height: 1.6;
  display:block;
  white-space: pre;
  color: #e5e7eb;
}

/* copy button injected by JS */
.copy-btn{
  position:absolute;
  top: 10px;
  right: 10px;
  font-size: .78rem;
  padding: .35rem .55rem;
  border-radius: 999px;
  border: 1px solid rgba(56,189,248,.35);
  background: rgba(56,189,248,.10);
  color: #e5e7eb;
  cursor:pointer;
}
.copy-btn:hover{
  background: rgba(56,189,248,.18);
}

/* =========================
   Footer
========================= */
.footer{
  margin: 1.2rem 0 1.8rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(255,255,255,.04);
  color: var(--muted);
}
.footer a{ color: var(--text); text-decoration:none; border-bottom:1px dashed rgba(56,189,248,.35); }
.footer a:hover{ color: var(--primary); }
.footer p{ margin:.25rem 0; }