:root {
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --card-border: #cbd5e1;
  --card-border-hover: #94a3b8;
  --primary: #2563eb;
  --primary-light: #eff6ff;
  --primary-border: #bfdbfe;
  --accent: #0284c7;
  --focus-band: #059669;
  --focus-band-bg: rgba(16, 185, 129, 0.18);
  --text: #0f172a;
  --text-muted: #0f172a;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; padding: 24px 16px; }
.container { max-width: 1320px; margin: 0 auto; }

/* Header */
header { display: flex; justify-content: space-between; align-items: center; padding-bottom: 18px; border-bottom: 1px solid var(--card-border); margin-bottom: 20px; gap: 12px; }
.logo { font-size: 1.3rem; font-weight: 800; color: var(--text); letter-spacing: -0.5px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.logo-badge { background: var(--primary); color: #fff; font-size: 0.7rem; padding: 2px 7px; border-radius: 4px; font-weight: 700; letter-spacing: 0.5px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.logo-sub { font-size: 0.85rem; font-weight: 600; color: var(--text); margin-left: 6px; padding-left: 10px; border-left: 2px solid var(--card-border); }
.header-info { color: var(--text); font-size: 0.8rem; font-weight: 600; background: #fff; border: 1px solid var(--card-border); padding: 5px 12px; border-radius: 6px; box-shadow: var(--shadow-sm); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

@media (max-width: 860px) {
  header { flex-direction: column; align-items: flex-start; }
  .logo-sub { border-left: none; padding-left: 0; width: 100%; margin-left: 0; margin-top: 4px; }
}

/* Hero / Engineering Brief */
.hero-section { background: #ffffff; border: 1px solid var(--card-border); border-radius: 12px; padding: 22px 24px; margin-bottom: 20px; box-shadow: var(--shadow-sm); }
.hero-title { font-size: 1.2rem; font-weight: 800; color: var(--text); letter-spacing: -0.3px; margin-bottom: 8px; }
.hero-desc { font-size: 0.88rem; color: var(--text); line-height: 1.7; font-weight: 500; margin-bottom: 16px; }
.hero-desc strong { color: var(--primary); font-weight: 700; }
.feature-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.tech-tag { background: #f8fafc; border: 1px solid var(--card-border); color: var(--text); font-size: 0.75rem; font-weight: 600; padding: 4px 10px; border-radius: 6px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.tech-tag span { color: var(--primary); font-weight: 700; margin-right: 4px; }

/* Layout */
.grid { display: grid; grid-template-columns: 410px 1fr; gap: 24px; }
@media (max-width: 1040px) { .grid { grid-template-columns: 1fr; } }

.card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 12px; padding: 22px; box-shadow: var(--shadow-sm); }
h2 { font-size: 1.05rem; font-weight: 700; margin-bottom: 18px; color: var(--text); display: flex; align-items: center; gap: 8px; }
h2::before { content: ""; display: inline-block; width: 4px; height: 16px; background: var(--primary); border-radius: 2px; }

/* Controls */
.control-group { margin-bottom: 16px; }
.label-row { display: flex; justify-content: space-between; font-size: 0.85rem; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.val-display { color: var(--primary); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-weight: 700; }
select, input[type="number"] { width: 100%; background: #fff; border: 1px solid var(--card-border); color: var(--text); padding: 8px 12px; border-radius: 8px; font-size: 0.9rem; font-weight: 500; outline: none; transition: border-color 0.15s; }
select:focus, input[type="number"]:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
select optgroup { font-weight: bold; color: var(--text); }

.slider-row { display: flex; gap: 10px; align-items: center; }
input[type="range"] { flex: 1; accent-color: var(--primary); cursor: pointer; height: 6px; }
.quick-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.tag-btn { background: #f1f5f9; border: 1px solid var(--card-border); color: var(--text); padding: 4px 8px; border-radius: 6px; font-size: 0.75rem; font-weight: 600; cursor: pointer; transition: all 0.15s; }
.tag-btn:hover { background: var(--primary-light); border-color: var(--primary-border); color: var(--primary); font-weight: 700; }

/* Metrics Grid */
.metrics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(135px, 1fr)); gap: 12px; margin-bottom: 20px; }
.metric-card { background: #f8fafc; border: 1px solid var(--card-border); border-radius: 10px; padding: 14px 10px; text-align: center; }
.metric-title { font-size: 0.75rem; font-weight: 700; color: var(--text); }
.metric-val { font-size: 1.25rem; font-weight: 800; color: var(--text); margin-top: 4px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.metric-sub { font-size: 0.72rem; color: var(--primary); margin-top: 2px; font-weight: 600; }

/* Visualizer Area */
.visual-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .visual-grid { grid-template-columns: 1fr; } }
.canvas-box { background: #f8fafc; border: 1px solid var(--card-border); border-radius: 10px; padding: 14px; text-align: center; }
.canvas-title { font-size: 0.8rem; font-weight: 700; color: var(--text); margin-bottom: 10px; text-align: left; display: flex; justify-content: space-between; align-items: center; }
canvas { width: 100%; height: 290px; display: block; border-radius: 8px; background: #ffffff; border: 1px solid #cbd5e1; }

/* Tab Bar */
.tab-bar { display: flex; gap: 6px; margin-bottom: 16px; background: #e2e8f0; padding: 4px; border-radius: 8px; }
.tab-btn { flex: 1; border: none; background: transparent; color: var(--text); padding: 8px; border-radius: 6px; font-size: 0.85rem; font-weight: 700; cursor: pointer; transition: all 0.15s; }
.tab-btn.active { background: #ffffff; color: var(--primary); box-shadow: var(--shadow-sm); }

/* Application Matrix Section */
.app-matrix { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; margin-top: 24px; }
.app-card { background: #ffffff; border: 1px solid var(--card-border); border-radius: 10px; padding: 18px; box-shadow: var(--shadow-sm); }
.app-card-title { font-size: 0.9rem; font-weight: 800; color: var(--text); margin-bottom: 6px; display: flex; align-items: center; gap: 6px; }
.app-card-title::before { content: ""; display: inline-block; width: 6px; height: 6px; background: var(--primary); border-radius: 50%; }
.app-card-desc { font-size: 0.82rem; color: var(--text); line-height: 1.6; font-weight: 500; }

/* Theory Section */
.theory-section { margin-top: 24px; border-top: 1px solid var(--card-border); padding-top: 28px; }
.theory-title { font-size: 1.3rem; font-weight: 800; color: var(--text); margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
.theory-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 20px; }
@media (max-width: 900px) { .theory-grid { grid-template-columns: 1fr; } }
.theory-card { background: #ffffff; border: 1px solid var(--card-border); border-radius: 10px; padding: 22px; box-shadow: var(--shadow-sm); }
.theory-card h3 { font-size: 1.05rem; font-weight: 700; color: var(--text); margin-bottom: 10px; padding-bottom: 8px; border-bottom: 2px solid #e2e8f0; }
.theory-card p { font-size: 0.9rem; color: var(--text); margin-bottom: 12px; line-height: 1.7; font-weight: 500; }
.math-box { background: #f8fafc; border: 1px solid var(--card-border); border-radius: 8px; padding: 14px; margin: 12px 0; font-size: 0.95rem; text-align: center; color: #0f172a; overflow-x: auto; }
.katex { color: #0f172a !important; font-weight: 500; }
.diagram-box { background: #ffffff; border: 1px solid var(--card-border); border-radius: 8px; padding: 12px; margin: 14px 0; text-align: center; }
.diagram-box svg { max-width: 100%; height: auto; }
.var-list { font-size: 0.85rem; color: var(--text); list-style: none; padding-left: 0; margin-top: 12px; line-height: 1.8; }
.var-list li { margin-bottom: 4px; }
.var-list strong { color: var(--text); margin-right: 6px; font-weight: 700; }

/* ---- 共通ヘッダー・フッター ---- */
a { color: var(--primary); }
.header-left { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.portal-link { text-decoration: none; display: inline-flex; align-items: center; gap: 4px; background: #0f172a; color: #fff; padding: 4px 8px; border-radius: 6px; font-size: 0.75rem; font-weight: 700; font-family: ui-monospace, monospace; }
.logo a { color: inherit; text-decoration: none; }
.site-nav { display: flex; gap: 14px; flex-wrap: wrap; font-size: 0.85rem; font-weight: 700; }
.site-nav a { color: var(--text); text-decoration: none; }
.site-nav a:hover { color: var(--primary); }
.site-footer { padding: 28px 0 8px; color: var(--text); font-size: 0.82rem; border-top: 1px solid var(--card-border); margin-top: 40px; }
.footer-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-bottom: 20px; }
.footer-cols h3 { font-size: 0.82rem; font-weight: 800; margin-bottom: 8px; }
.footer-cols ul { list-style: none; line-height: 1.9; }
.footer-cols a { color: var(--text); text-decoration: none; font-weight: 600; }
.footer-cols a:hover { color: var(--primary); text-decoration: underline; }
.copyright { text-align: center; font-weight: 600; }

/* ---- 広告枠（プレースホルダ） ---- */
/* 広告ユニットのコードを入れるまでは何も表示しない */
.ad-slot { margin: 24px 0; }
.ad-slot:empty { margin: 0; }

/* ---- シミュレーター追加分 ---- */
.hero-paths { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 12px; margin-top: 16px; }
.hero-path { display: block; background: #f8fafc; border: 1px solid var(--card-border); border-radius: 10px; padding: 12px 14px; text-decoration: none; color: var(--text); font-size: 0.82rem; line-height: 1.6; }
.hero-path strong { display: block; font-size: 0.92rem; color: var(--primary); margin-bottom: 2px; }
.hero-path:hover { border-color: var(--primary); }
.hero-path .links { margin-top: 6px; display: flex; flex-wrap: wrap; gap: 4px 10px; }
.hero-path .links a { font-weight: 700; }
.eff-line { font-size: 0.82rem; font-weight: 600; background: var(--primary-light); border: 1px solid var(--primary-border); border-radius: 8px; padding: 8px 12px; margin: -6px 0 16px; display: flex; flex-wrap: wrap; gap: 4px 16px; }
.eff-line b { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.coc-row { display: flex; gap: 10px; margin-top: 8px; align-items: center; font-size: 0.82rem; font-weight: 600; }
.coc-row input { width: 110px; }
.share-row { display: flex; gap: 10px; align-items: center; margin-top: 8px; border-top: 1px solid var(--card-border); padding-top: 16px; }
.btn { background: var(--primary); color: #fff; border: none; border-radius: 8px; padding: 9px 14px; font-size: 0.85rem; font-weight: 700; cursor: pointer; text-decoration: none; display: inline-block; }
.btn:hover { background: #1d4ed8; }
.btn-sub { background: #fff; color: var(--primary); border: 1px solid var(--primary-border); }
.btn-sub:hover { background: var(--primary-light); }
.share-msg { font-size: 0.78rem; font-weight: 600; color: var(--focus-band); }
.notes { font-size: 0.82rem; line-height: 1.7; margin-top: 16px; padding-left: 1.2em; }

/* ---- 静的ページ ---- */
.page { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 12px; padding: 28px 24px; box-shadow: var(--shadow-sm); }
.page h1 { font-size: 1.45rem; font-weight: 800; line-height: 1.4; margin-bottom: 14px; letter-spacing: -0.3px; }
.page h2 { margin-top: 30px; margin-bottom: 12px; font-size: 1.1rem; }
.page h3 { margin: 20px 0 8px; font-size: 0.98rem; font-weight: 800; }
.page p, .page li { font-size: 0.92rem; line-height: 1.85; }
.page p { margin-bottom: 12px; }
.page ul, .page ol { padding-left: 1.4em; margin-bottom: 12px; }
.lead { font-size: 0.95rem; }
.crumbs { font-size: 0.78rem; margin-bottom: 14px; display: flex; flex-wrap: wrap; gap: 4px; list-style: none; padding: 0; }
.crumbs li:not(:last-child)::after { content: "›"; margin-left: 6px; color: #94a3b8; }
.crumbs a { color: var(--text); }
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin: 18px 0; }
.kpi { background: #f8fafc; border: 1px solid var(--card-border); border-radius: 10px; padding: 12px; text-align: center; }
.kpi .k { font-size: 0.75rem; font-weight: 700; }
.kpi .v { font-size: 1.3rem; font-weight: 800; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 10px 0 18px; border: 1px solid var(--card-border); border-radius: 8px; max-width: 100%; }
.table-wrap table { border-collapse: collapse; width: 100%; font-size: 0.85rem; white-space: nowrap; }
.table-wrap th, .table-wrap td { padding: 8px 10px; border-bottom: 1px solid #e2e8f0; text-align: right; }
.table-wrap th:first-child, .table-wrap td:first-child { text-align: left; }
.table-wrap thead th { background: #f1f5f9; font-weight: 800; }
.table-wrap tbody tr:last-child td { border-bottom: none; }
.table-wrap td.num, .table-wrap .mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.table-wrap tr.current td { background: var(--primary-light); font-weight: 700; }
.cta { margin: 20px 0; }
.link-list { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0 !important; }
.link-list a, .link-list .current { display: inline-block; border: 1px solid var(--card-border); border-radius: 6px; padding: 4px 10px; font-size: 0.85rem; font-weight: 700; text-decoration: none; background: #fff; }
.link-list a:hover { border-color: var(--primary); }
.link-list .current { color: var(--text); border-color: var(--primary); background: var(--primary-light); }
.figure { margin: 16px 0; text-align: center; }
.figure svg { width: 100%; max-width: 520px; height: auto; }
.note { font-size: 0.8rem !important; color: #334155; }
.pending { background: #fffbeb; border: 1px dashed #f59e0b; border-radius: 8px; padding: 12px 14px; font-size: 0.85rem; }
@media (max-width: 480px) {
  body { padding: 16px 12px; }
  .page { padding: 20px 16px; }
  .page h1 { font-size: 1.2rem; }
}
/* グリッドの子要素が数式などの幅で押し広げられないようにする（スマートフォン幅のはみ出し対策） */
.grid > *, .theory-grid > *, .visual-grid > * { min-width: 0; }
.math-box .katex-display { overflow-x: auto; overflow-y: hidden; }
.link-list.guide-list { display: block; }
.link-list.guide-list li { margin-bottom: 12px; }
.page .formula { background: #f8fafc; border: 1px solid var(--card-border); border-radius: 8px; padding: 10px 14px; font-weight: 700; font-size: 0.88rem; }