:root{
  --bg:#0b1220;
  --card:#0f1b33;
  --card2:#0c1730;
  --text:#e7eefc;
  --muted:#9fb0d3;

  --primary:#60a5fa;
  --accent:#f59e0b;
  --good:#22c55e;
  --bad:#ef4444;

  --border:rgba(255,255,255,.12);
  --radius:16px;
  --shadow:0 18px 44px rgba(0,0,0,.35);

  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }

body{
  margin:0;
  font-family:"Noto Sans JP", system-ui, -apple-system, Segoe UI, sans-serif;
  color:var(--text);
  background:
    radial-gradient(900px 500px at 20% 10%, rgba(96,165,250,.25), transparent 60%),
    radial-gradient(900px 500px at 80% 0%, rgba(245,158,11,.16), transparent 60%),
    var(--bg);
}

/* Topbar */
.topbar{
  position:sticky;
  top:0;
  z-index:50;
  backdrop-filter: blur(12px);
  background: rgba(11,18,32,.55);
  border-bottom:1px solid var(--border);
}
.topbar__inner{
  max-width: 1180px;
  margin:0 auto;
  padding: 12px 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  color:var(--text);
}
.brand__dot{
  width:12px;height:12px;border-radius:999px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 0 0 4px rgba(96,165,250,.15);
}
.brand__name{ font-weight:700; letter-spacing:.02em; }

.topnav{
  display:flex;
  align-items:center;
  gap:12px;
  flex-wrap:wrap;
}
.topnav a{
  color:var(--muted);
  text-decoration:none;
  padding:8px 10px;
  border-radius:10px;
  border:1px solid transparent;
}
.topnav a:hover{
  color:var(--text);
  border-color: var(--border);
  background: rgba(255,255,255,.04);
}
.topnav a.is-active{
  color:var(--text);
  border-color: rgba(96,165,250,.35);
  background: rgba(96,165,250,.10);
}

/* Layout */
.wrap{
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 16px 48px;
}

.crumb{
  display:flex;
  align-items:center;
  gap:8px;
  color:var(--muted);
  font-size:14px;
  margin: 6px 0 14px;
}
.crumb a{ color: var(--muted); text-decoration:none; }
.crumb a:hover{ color: var(--text); }
.crumb .sep{ opacity:.55; }

.layout{
  display:grid;
  grid-template-columns: 320px 1fr;
  gap: 18px;
  align-items:start;
}

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

/* Sidebar */
.side{ position:sticky; top:74px; }
@media (max-width: 980px){
  .side{ position:relative; top:auto; }
}

.side__card{
  background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.01));
  border:1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px;
  margin-bottom: 14px;
}
.side__title{
  font-weight:700;
  margin-bottom: 10px;
  letter-spacing:.02em;
}
.side__empty{ color: var(--muted); font-size: 14px; }

.toc{
  list-style:none;
  padding:0;
  margin:0;
  display:flex;
  flex-direction:column;
  gap:6px;
}
.toc a{
  display:block;
  text-decoration:none;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 10px;
  border:1px solid transparent;
}
.toc a:hover{
  color: var(--text);
  border-color: var(--border);
  background: rgba(255,255,255,.04);
}

.side__actions{
  margin-top: 12px;
  display:flex;
  gap:10px;
  flex-wrap:wrap;
}

.meta .meta__row{
  display:grid;
  grid-template-columns: 72px 1fr;
  gap: 10px;
  padding: 10px 0;
  border-top: 1px solid rgba(255,255,255,.06);
}
.meta .meta__row:first-child{ border-top:none; padding-top:0; }
.meta__k{ color: var(--muted); font-size: 13px; }
.meta__v{ font-size: 13px; color: var(--text); }

.pill{
  display:inline-flex;
  align-items:center;
  padding: 5px 9px;
  border-radius: 999px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.04);
  color: var(--text);
  margin: 2px 6px 2px 0;
  font-size: 12px;
}

/* Main Article */
.main{
  min-width: 0;
  background: rgba(0,0,0,.0);
}

.hero{
  border:1px solid rgba(255,255,255,.10);
  border-radius: calc(var(--radius) + 6px);
  box-shadow: var(--shadow);
  background:
    radial-gradient(700px 300px at 20% 20%, rgba(96,165,250,.25), transparent 65%),
    radial-gradient(700px 300px at 90% 10%, rgba(245,158,11,.18), transparent 65%),
    linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.015));
  overflow:hidden;
}
.hero__inner{ padding: 20px 18px; }
.kicker{
  margin:0 0 6px;
  color: var(--muted);
  letter-spacing:.12em;
  text-transform: uppercase;
  font-size: 12px;
}
.hero h1{
  margin:0 0 8px;
  font-size: 30px;
  line-height: 1.2;
}
.lead{
  margin:0;
  color: var(--text);
  opacity:.9;
  line-height: 1.8;
}
.hero__badges{
  margin-top: 14px;
  display:flex;
  gap:8px;
  flex-wrap:wrap;
}
.badge{
  display:inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  border:1px solid rgba(96,165,250,.30);
  background: rgba(96,165,250,.10);
  color: var(--text);
  font-size: 12px;
}

.content{
  margin-top: 14px;
  border:1px solid rgba(255,255,255,.10);
  border-radius: calc(var(--radius) + 6px);
  box-shadow: var(--shadow);
  background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.01));
  padding: 18px;
}

.content h2{
  margin: 18px 0 10px;
  font-size: 20px;
  letter-spacing:.02em;
}
.content h3{
  margin: 16px 0 8px;
  font-size: 16px;
}
.content p, .content li{
  color: rgba(231,238,252,.92);
  line-height: 1.9;
}
.content ul{ margin: 10px 0 16px 18px; }
.content code{
  font-family: var(--mono);
  font-size: .95em;
  padding: .1em .35em;
  border-radius: 8px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(0,0,0,.22);
}
pre{
  margin: 10px 0 16px;
  border-radius: 14px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(0,0,0,.30);
  overflow:auto;
  box-shadow: 0 10px 22px rgba(0,0,0,.25);
  position:relative;
}
pre code{
  display:block;
  padding: 14px 14px 14px;
  border:none;
  background: transparent;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
  white-space: pre;
}

.callout{
  padding: 12px 12px;
  border-radius: 14px;
  border:1px solid rgba(245,158,11,.25);
  background: rgba(245,158,11,.10);
  margin: 12px 0 16px;
}
.note{
  color: var(--muted);
  font-size: 14px;
}

.grid2{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (max-width: 720px){
  .grid2{ grid-template-columns: 1fr; }
}
.card{
  border:1px solid rgba(255,255,255,.10);
  border-radius: 16px;
  background: rgba(255,255,255,.03);
  padding: 12px;
}
.divider{
  height:1px;
  background: rgba(255,255,255,.10);
  margin: 18px 0;
}
.footnote{
  color: var(--muted);
  font-size: 13px;
}

/* Toolbox */
.toolbox{
  border:1px solid rgba(255,255,255,.10);
  border-radius: 16px;
  background: rgba(255,255,255,.02);
  padding: 12px;
  margin: 12px 0 16px;
}
.toolbox__row{
  display:grid;
  grid-template-columns: 1.6fr .9fr;
  gap: 12px;
}
@media (max-width: 980px){
  .toolbox__row{ grid-template-columns: 1fr; }
}
.label{
  display:block;
  color: var(--muted);
  font-size: 13px;
  margin: 0 0 6px;
}
.textarea{
  width:100%;
  min-height: 220px;
  resize: vertical;
  padding: 12px;
  border-radius: 14px;
  border:1px solid rgba(255,255,255,.12);
  background: rgba(0,0,0,.22);
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  outline:none;
}
.textarea:focus{
  border-color: rgba(96,165,250,.45);
  box-shadow: 0 0 0 4px rgba(96,165,250,.15);
}

.file{
  width:100%;
  padding: 10px;
  border-radius: 14px;
  border:1px solid rgba(255,255,255,.12);
  background: rgba(0,0,0,.22);
  color: var(--text);
}

.btns{
  margin-top: 10px;
  display:flex;
  gap: 10px;
  flex-wrap:wrap;
}
.btns.col{ flex-direction:column; align-items:stretch; }

.btn{
  appearance:none;
  border:1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.06);
  color: var(--text);
  border-radius: 14px;
  padding: 10px 12px;
  cursor:pointer;
  font-weight: 600;
}
.btn:hover{
  background: rgba(255,255,255,.10);
}
.btn--primary{
  border-color: rgba(96,165,250,.40);
  background: rgba(96,165,250,.18);
}
.btn--primary:hover{
  background: rgba(96,165,250,.25);
}
.btn--ghost{
  background: transparent;
}
.btn--sm{
  padding: 8px 10px;
  border-radius: 12px;
  font-size: 13px;
}
.hint{
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

/* Footer */
.footer{
  margin-top: 22px;
  border-top: 1px solid rgba(255,255,255,.10);
  background: rgba(0,0,0,.10);
}
.footer__inner{
  max-width: 1180px;
  margin:0 auto;
  padding: 16px;
  display:flex;
  justify-content:space-between;
  gap: 12px;
  flex-wrap:wrap;
  color: var(--muted);
  font-size: 13px;
}
.footer a{ color: var(--muted); text-decoration:none; }
.footer a:hover{ color: var(--text); }

/* Error */
.error{
  border:1px solid rgba(239,68,68,.35);
  background: rgba(239,68,68,.08);
  border-radius: 16px;
  padding: 16px;
  box-shadow: var(--shadow);
}
.error h1{ margin: 0 0 10px; }




/* =========================
  Footer (SunStripe / Programming Lab)
  対象HTML:
  <footer class="footer">
    <div class="foot__copy">...</div>
    <nav class="foot__nav"><ul>...</ul></nav>
  </footer>
========================= */

footer{
  margin-top:18px;
  padding:18px 14px;
  border:1px solid rgba(33,115,70,.22);
  border-radius:14px;
  background:
    radial-gradient(900px 200px at 20% 0%, rgba(33,115,70,.18), transparent 65%),
    radial-gradient(700px 200px at 85% 10%, rgba(15,123,108,.12), transparent 70%),
    linear-gradient(180deg, rgba(255,255,255,.06), rgba(0,0,0,.06));
  box-shadow:0 14px 34px rgba(0,0,0,.25);
  color:var(--muted);
}

.foot__copy{
  font-size:12px;
  color:var(--muted);
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  align-items:center;
  justify-content:flex-start;
  padding-bottom:12px;
  border-bottom:1px solid rgba(255,255,255,.10);
}

.foot__copy a{
  color:var(--excelWhite2, #d9ffe9);
  text-decoration:none;
  font-weight:800;
  border-bottom:1px solid rgba(33,115,70,.35);
}

.foot__copy a:hover{
  filter:brightness(1.08);
  border-bottom-color:rgba(33,115,70,.60);
}

.foot__nav{
  margin-top:12px;
}

.foot__nav ul{
  list-style:none;
  padding:0;
  margin:0;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  align-items:center;
}

.foot__nav li{
  margin:0;
}

/* Excel風リンクチップ */
.foot__nav a{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:7px 10px;
  border-radius:999px;
  border:1px solid rgba(33,115,70,.26);
  background:
    linear-gradient(180deg, rgba(33,115,70,.18), rgba(0,0,0,.06));
  color:var(--excelWhite, #f3fff8);
  font-size:12px;
  letter-spacing:.02em;
  text-decoration:none;
  transition:transform .12s ease, filter .12s ease, border-color .12s ease;
  box-shadow:0 10px 22px rgba(0,0,0,.18);
  white-space:nowrap;
}

.foot__nav a:hover{
  filter:brightness(1.08);
  border-color:rgba(33,115,70,.55);
  transform:translateY(-1px);
}

.foot__nav a:active{
  transform:translateY(0);
}

/* 今いるページが分かるように（任意：bodyにdata-current="/programming/xlsx/"とか付けると便利） */
/*
body[data-current="/programming/xlsx/"] .foot__nav a[href="/programming/xlsx/"]{
  border-color:rgba(33,115,70,.75);
  background:linear-gradient(180deg, rgba(33,115,70,.40), rgba(33,115,70,.18));
  color:var(--excelWhite2, #d9ffe9);
}
*/

/* スマホで詰まりすぎないように */
@media (max-width:560px){
  footer{
    padding:16px 12px;
  }
  .foot__nav a{
    padding:7px 9px;
    font-size:12px;
  }
}