/* =========================================================
   AI-Native DX — Shared Stylesheet
   Autofusion brand tokens (autofusion-sg.com 準拠)
   ========================================================= */
:root {
  --metallic-blue-dark: #0a1929;
  --metallic-blue-base: #1e3a8a;
  --metallic-blue-mid:  #3b82f6;
  --metallic-blue-light:#60a5fa;
  --metallic-blue-bright:#93bbfd;
  --metallic-accent:    #dbeafe;

  --bg-primary:   #0c1322;
  --bg-secondary: #141d30;
  --bg-card:      #1f2937;
  --border-color: #374151;
  --text-primary: #f3f4f6;
  --text-secondary:#9ca3af;

  --gradient-metallic: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 50%, #60a5fa 100%);
  --gradient-shine:    linear-gradient(135deg, #1476bc 0%, #c0c3e3 50%, #28497c 100%);

  --sidebar-width: 280px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, "Helvetica Neue",
               "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at top left, rgba(59,130,246,0.15) 0%, transparent 40%),
    radial-gradient(ellipse at bottom right, rgba(30,58,138,0.15) 0%, transparent 40%);
  pointer-events: none;
  z-index: 0;
}

/* =========================================================
   Sidebar
   ========================================================= */
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: rgba(7, 18, 48, 0.92);
  backdrop-filter: blur(20px);
  border-right: 1px solid rgba(59,130,246,0.2);
  z-index: 100;
  padding: 2.5rem 1rem;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  text-decoration: none;
  color: white;
  margin-bottom: 0.3rem;
}
.sidebar-brand img {
  width: 1.9rem;
  height: 1.9rem;
  object-fit: contain;
  display: block;
}
.sidebar-brand-name {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.3px;
  color: white;
  line-height: 1;
}

.sidebar-tagline {
  color: var(--metallic-blue-light);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 2rem;
  text-shadow: 0 0 20px rgba(59,130,246,0.3);
  text-align: center;
}

.sidebar-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--metallic-blue-mid), transparent);
  margin-bottom: 1.5rem;
  opacity: 0.5;
}

.sidebar-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--metallic-blue-bright);
  line-height: 1.4;
  margin-bottom: 0.5rem;
  letter-spacing: 0;
  text-align: center;
  white-space: nowrap;
}
.sidebar-subtitle {
  font-size: 0.72rem;
  color: var(--text-secondary);
  font-weight: 500;
  letter-spacing: 1.2px;
  text-align: center;
  margin-bottom: 1.75rem;
}

.sidebar-section-label {
  font-size: 0.7rem;
  color: var(--text-secondary);
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.sidebar-nav { list-style: none; }
.sidebar-nav li { margin-bottom: 0.35rem; }

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0.9rem;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 10px;
  transition: all 0.25s ease;
  position: relative;
}

.sidebar-nav a:hover {
  background: rgba(59,130,246,0.12);
  color: var(--metallic-blue-bright);
  transform: translateX(2px);
}

.sidebar-nav a.active {
  background: rgba(59,130,246,0.18);
  color: var(--metallic-blue-bright);
  box-shadow: inset 3px 0 0 var(--metallic-blue-mid);
}

.sidebar-nav .num {
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  background: var(--gradient-metallic);
  color: white;
  font-size: 0.7rem;
  font-weight: 800;
  box-shadow: 0 4px 10px rgba(59,130,246,0.3);
  flex-shrink: 0;
}

.sidebar-footer {
  margin-top: auto;
  padding-top: 2rem;
  font-size: 0.72rem;
  color: var(--text-secondary);
  line-height: 1.65;
  text-align: center;
  opacity: 0.7;
}
.sidebar-footer a {
  color: var(--metallic-blue-light);
  text-decoration: none;
}
.sidebar-footer a:hover { color: var(--metallic-blue-bright); }

/* =========================================================
   Main
   ========================================================= */
.main {
  margin-left: var(--sidebar-width);
  padding: 4rem 4rem;
  max-width: 1400px;
  position: relative;
  z-index: 2;
}

.eyebrow {
  color: var(--metallic-blue-light);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  text-shadow: 0 0 20px rgba(59,130,246,0.4);
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  text-align: center;
  background: linear-gradient(135deg, #2563eb 0%, #93bbfd 45%, #c0c3e3 60%, #3b82f6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.3;
  margin-bottom: 1rem;
  filter: drop-shadow(0 0 8px rgba(96,165,250,0.12));
  padding-bottom: 0.15em;
}
.section-title::after {
  display: none;
}

.section-lead {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 920px;
  margin-bottom: 2.5rem;
}

.section-divider {
  width: 60px;
  height: 4px;
  background: var(--gradient-metallic);
  border-radius: 2px;
  margin: 0 auto 2rem;
  box-shadow: 0 0 20px rgba(59,130,246,0.5);
}

.note {
  color: var(--metallic-blue-light);
  font-size: 0.85rem;
}

/* =========================================================
   Callout (キーメッセージ強調)
   ========================================================= */
.callout {
  background: linear-gradient(135deg, rgba(30,58,138,0.4) 0%, rgba(59,130,246,0.15) 100%);
  border: 1px solid rgba(96,165,250,0.35);
  border-radius: 18px;
  padding: 1.75rem 2rem;
  margin: 0 0 2.5rem 0;
  position: relative;
  overflow: hidden;
}
.callout::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top right, rgba(59,130,246,0.18), transparent 60%);
  pointer-events: none;
}
.callout-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--metallic-blue-bright);
  margin-bottom: 0.45rem;
  position: relative;
  z-index: 1;
}
.callout-text {
  color: var(--text-primary);
  font-size: 0.95rem;
  line-height: 1.75;
  position: relative;
  z-index: 1;
}
.callout-text strong {
  color: var(--metallic-blue-bright);
  font-weight: 700;
}
.callout-emphasis {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
  line-height: 1.65;
  position: relative;
  z-index: 1;
}

/* callout 内の3点リスト */
.callout-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  z-index: 1;
}
.callout-list li {
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
}
.callout-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--gradient-metallic);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.72rem;
  font-weight: 800;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(59,130,246,0.35), inset 0 1px 0 rgba(255,255,255,0.3);
  margin-top: 2px;
  letter-spacing: 0.5px;
}
.callout-item-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--metallic-blue-bright);
  margin-bottom: 0.2rem;
  line-height: 1.55;
}
.callout-item-text {
  color: var(--text-primary);
  font-size: 0.9rem;
  line-height: 1.7;
}
.callout-item-text strong {
  color: var(--metallic-blue-bright);
  font-weight: 700;
}

/* =========================================================
   Hero (Overview Page)
   ========================================================= */
.hero-headline {
  font-size: 3rem;
  font-weight: 800;
  background: var(--gradient-shine);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.25;
  margin-bottom: 1.25rem;
  letter-spacing: -1px;
  padding-bottom: 0.15em;
  filter: drop-shadow(0 0 40px rgba(59,130,246,0.3));
}

.hero-sub {
  color: var(--text-secondary);
  font-size: 1.15rem;
  max-width: 1150px;
  margin-bottom: 3rem;
}

/* =========================================================
   Architecture Diagram
   ========================================================= */
.architecture {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) 140px minmax(0, 1fr);
  gap: 0;
  align-items: stretch;
  position: relative;
}

.arch-areas {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.arch-card {
  background: var(--bg-card);
  border: 1px solid var(--metallic-blue-dark);
  border-radius: 18px;
  padding: 1.5rem 1.5rem;
  position: relative;
  overflow: hidden;
  transition: all 0.3s;
  text-decoration: none;
  color: inherit;
  display: block;
}
.arch-card:hover {
  border-color: var(--metallic-blue-mid);
  transform: translateY(-2px);
  box-shadow: 0 15px 35px rgba(59,130,246,0.25);
}

.arch-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--metallic-blue-bright);
  margin-bottom: 0.35rem;
}

.arch-card-sub {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 1rem;
}

.arch-card-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin: 0 0 1rem 0;
  padding: 0;
}
.arch-card-bullets li {
  position: relative;
  padding-left: 1.05rem;
  color: var(--text-primary);
  font-size: 0.85rem;
  line-height: 1.55;
}
.arch-card-bullets li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--metallic-blue-light);
  box-shadow: 0 0 8px var(--metallic-blue-mid);
}

.tool-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.chip {
  padding: 0.35rem 0.8rem;
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.3);
  color: var(--metallic-blue-bright);
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
}
.chip.placeholder {
  border-style: dashed;
  color: var(--text-secondary);
  background: transparent;
}

.arch-connections { position: relative; }
.arch-connections svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.arch-data { display: flex; align-items: stretch; }

.data-card {
  flex: 1;
  height: 100%;
  background: var(--bg-card);
  border: 1px solid var(--metallic-blue-dark);
  border-radius: 18px;
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  overflow: hidden;
}
.data-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top right, rgba(59,130,246,0.15), transparent 60%);
  pointer-events: none;
}
.data-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--metallic-blue-bright);
  position: relative;
  z-index: 1;
}
.data-card-sub {
  color: var(--text-secondary);
  font-size: 0.85rem;
  position: relative;
  z-index: 1;
}
.data-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-top: 0.5rem;
  position: relative;
  z-index: 1;
}
.data-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.75rem 0.9rem;
  background: rgba(10,25,41,0.6);
  border: 1px solid rgba(59,130,246,0.2);
  border-radius: 10px;
  font-size: 0.9rem;
  color: var(--text-primary);
  font-weight: 500;
  flex-direction: column;
}
.data-list li .row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.data-list li .desc {
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 400;
  margin-left: 16px;
  line-height: 1.5;
}
.data-list li .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--metallic-blue-light);
  box-shadow: 0 0 10px var(--metallic-blue-mid);
  flex-shrink: 0;
}

/* =========================================================
   Principles Panel (Overview 下部のリッチ化)
   ========================================================= */
.principles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}
.principle {
  background: linear-gradient(180deg, rgba(31,41,55,0.6), rgba(31,41,55,0.3));
  border: 1px solid rgba(59,130,246,0.18);
  border-radius: 14px;
  padding: 1.25rem 1.4rem;
  position: relative;
  overflow: hidden;
}
.principle-num {
  font-size: 0.7rem;
  letter-spacing: 2px;
  font-weight: 800;
  color: var(--metallic-blue-light);
  margin-bottom: 0.4rem;
}
.principle-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--metallic-blue-bright);
  margin-bottom: 0.4rem;
}
.principle-desc {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.65;
}
@media (max-width: 768px) {
  .principles { grid-template-columns: 1fr; }
}

/* =========================================================
   進化の3段階 (AI駆動型開発)
   ========================================================= */
.evolution {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1rem 0 2.5rem 0;
  position: relative;
}
.evolution.evolution-2col {
  grid-template-columns: repeat(2, 1fr);
}
.stage {
  background: var(--bg-card);
  border: 1px solid var(--metallic-blue-dark);
  border-radius: 14px;
  padding: 1.4rem 1.3rem;
  position: relative;
  overflow: hidden;
  transition: all 0.3s;
}
.stage::after {
  content: '→';
  position: absolute;
  top: 50%;
  right: -1.05rem;
  transform: translateY(-50%);
  color: var(--metallic-blue-mid);
  font-size: 1.4rem;
  font-weight: 800;
  z-index: 2;
}
.stage:last-child::after { display: none; }
.stage.now {
  border-color: var(--metallic-blue-mid);
  background: linear-gradient(180deg, rgba(59,130,246,0.12), rgba(31,41,55,0.7));
  box-shadow: 0 12px 30px rgba(59,130,246,0.2);
}
.stage.muted {
  opacity: 0.65;
  background: rgba(31, 41, 55, 0.6);
  border-color: rgba(55, 65, 81, 0.8);
  filter: grayscale(0.3);
}
.stage.muted .stage-num,
.stage.muted .stage-title {
  color: var(--text-secondary);
}
.stage.muted::after {
  color: var(--text-secondary);
  opacity: 0.6;
}
.stage.now::before {
  content: 'NOW';
  position: absolute;
  top: 0.7rem;
  right: 0.7rem;
  font-size: 0.62rem;
  letter-spacing: 1.5px;
  font-weight: 800;
  padding: 0.18rem 0.5rem;
  border-radius: 6px;
  background: var(--gradient-metallic);
  color: white;
  box-shadow: 0 4px 10px rgba(59,130,246,0.4);
}
.stage-num {
  font-size: 0.7rem;
  letter-spacing: 2px;
  font-weight: 800;
  color: var(--metallic-blue-light);
  margin-bottom: 0.4rem;
}
.stage-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--metallic-blue-bright);
  margin-bottom: 0.45rem;
  line-height: 1.45;
}
.stage-desc {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.65;
}

/* =========================================================
   価値特性 (3x2グリッド)
   ========================================================= */
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  margin: 1rem 0 2.5rem 0;
}
.value-tile {
  background: var(--bg-card);
  border: 1px solid var(--metallic-blue-dark);
  border-radius: 14px;
  padding: 1.3rem 1.4rem;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}
.value-tile::before {
  content: '';
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 3px;
  background: var(--gradient-metallic);
  opacity: 0.6;
}
.value-tile:hover {
  border-color: var(--metallic-blue-mid);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(59,130,246,0.18);
}
.value-tile-icon {
  width: 36px;
  height: 36px;
  margin-bottom: 0.85rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 9px;
  background: rgba(59,130,246,0.15);
  border: 1px solid rgba(96,165,250,0.3);
  color: var(--metallic-blue-bright);
}
.value-tile-icon svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 1.8;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.value-tile-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--metallic-blue-bright);
  margin-bottom: 0.45rem;
  line-height: 1.4;
}
.value-tile-desc {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.7;
}

/* =========================================================
   Risk Grid (取り組まないリスク)
   ========================================================= */
.risk-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 1rem 0 1.5rem 0;
}
.risk-card {
  background: linear-gradient(180deg, rgba(127,29,29,0.18), rgba(31,41,55,0.5));
  border: 1px solid rgba(220,38,38,0.28);
  border-radius: 14px;
  padding: 1.5rem 1.5rem 1.5rem 1.5rem;
  position: relative;
  overflow: hidden;
}
.risk-card-header {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.4rem;
}
.risk-card-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(220,38,38,0.22);
  border: 1px solid rgba(220,38,38,0.45);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fca5a5;
  flex-shrink: 0;
}
.risk-card-icon svg { width: 16px; height: 16px; stroke: currentColor; stroke-width: 2; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.risk-card-label {
  font-size: 0.7rem;
  letter-spacing: 1.5px;
  font-weight: 800;
  color: #fca5a5;
  text-transform: uppercase;
}
.risk-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fecaca;
  margin-bottom: 0.7rem;
}
.risk-card-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
}
.risk-card-list li {
  position: relative;
  padding-left: 1.1rem;
  color: var(--text-primary);
  font-size: 0.88rem;
  line-height: 1.65;
}
.risk-card-list li::before {
  content: '⚠';
  position: absolute;
  left: 0;
  top: 0;
  color: #fca5a5;
  font-size: 0.75rem;
  line-height: 1.65;
}
.risk-summary {
  background: rgba(31,41,55,0.5);
  border: 1px solid rgba(220,38,38,0.2);
  border-left: 3px solid rgba(220,38,38,0.5);
  border-radius: 10px;
  padding: 1.1rem 1.35rem;
  color: var(--text-primary);
  font-size: 0.9rem;
  line-height: 1.75;
  margin: 0 0 2.5rem 0;
}
@media (max-width: 768px) {
  .risk-grid { grid-template-columns: 1fr; }
}

/* =========================================================
   Tool Card Icon (SVG)
   ========================================================= */
.tool-icon-svg {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--gradient-metallic);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 8px 18px rgba(59,130,246,0.3), inset 0 1px 0 rgba(255,255,255,0.25);
  flex-shrink: 0;
}
.tool-icon-svg svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  stroke-width: 1.8;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* セクション間の小見出し */
.subsection-label {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 2.5px;
  font-weight: 800;
  color: var(--metallic-blue-light);
  margin: 3rem 0 0.6rem 0;
  text-transform: uppercase;
}
.subsection-label-risk {
  color: #f87171;
  text-shadow: 0 0 12px rgba(248, 113, 113, 0.35);
}
.subsection-title {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.7rem;
  line-height: 1.35;
}
.subsection-lead {
  color: var(--text-secondary);
  font-size: 0.98rem;
  max-width: 920px;
  margin-bottom: 1.5rem;
  line-height: 1.7;
}
.subsection-lead.subsection-lead-wide {
  max-width: none;
}

@media (max-width: 768px) {
  .evolution, .value-grid { grid-template-columns: 1fr; }
  .stage::after { display: none; }
}

/* =========================================================
   Tool Cards (各領域ページ)
   ========================================================= */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}
.tool-grid.cols-2 {
  grid-template-columns: repeat(2, 1fr);
}
@media (max-width: 768px) {
  .tool-grid.cols-2 { grid-template-columns: 1fr; }
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--metallic-blue-dark);
  border-radius: 18px;
  padding: 1.75rem 1.5rem;
  position: relative;
  overflow: hidden;
  transition: all 0.3s;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}
.tool-card:hover {
  border-color: var(--metallic-blue-mid);
  transform: translateY(-4px);
  box-shadow: 0 18px 40px rgba(59,130,246,0.25);
}
.tool-card.placeholder {
  border-style: dashed;
  border-color: rgba(59,130,246,0.35);
  background: rgba(31,41,55,0.4);
}

.and-more {
  background: rgba(31,41,55,0.5);
  border: 1px solid rgba(96,165,250,0.25);
  border-left: 3px solid rgba(96,165,250,0.6);
  border-radius: 10px;
  padding: 1.1rem 1.35rem;
  color: var(--metallic-blue-bright);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.75;
  margin: 2.5rem 0 0;
  text-align: center;
}
.and-more::before { display: none; }
.and-more::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top right, rgba(59,130,246,0.2), transparent 60%);
  pointer-events: none;
}

.tool-card-head {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}
.tool-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--gradient-metallic);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 0.95rem;
  box-shadow: 0 8px 18px rgba(59,130,246,0.3), inset 0 1px 0 rgba(255,255,255,0.25);
  flex-shrink: 0;
  overflow: hidden;
}
.tool-icon.placeholder {
  background: rgba(59,130,246,0.15);
  color: var(--metallic-blue-light);
  box-shadow: none;
}

/* 製品ロゴ用：画像をそのまま表示 */
.tool-logo {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
  background: var(--bg-primary);
  box-shadow: 0 4px 12px rgba(0,0,0,0.25), 0 0 0 1px rgba(255,255,255,0.06);
}
.tool-logo img,
.tool-logo svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.tool-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}
.tool-tagline {
  font-size: 0.78rem;
  color: var(--metallic-blue-light);
  font-weight: 600;
  letter-spacing: 0.5px;
}

.tool-desc {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
}

.tool-uses {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-top: auto;
}
.tool-uses li {
  position: relative;
  padding-left: 1.25rem;
  color: var(--text-primary);
  font-size: 0.88rem;
  line-height: 1.55;
}
.tool-uses li::before {
  content: '✓';
  position: absolute;
  left: 0; top: 0;
  color: var(--metallic-blue-light);
  font-weight: 800;
}

/* =========================================================
   Data tile grid (data-system page)
   ========================================================= */
.data-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
@media (max-width: 992px) {
  .data-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .data-grid { grid-template-columns: 1fr; }
}
.data-tile {
  background: var(--bg-card);
  border: 1px solid var(--metallic-blue-dark);
  border-radius: 18px;
  padding: 1.5rem;
  transition: all 0.3s;
}
.data-tile:hover {
  border-color: var(--metallic-blue-mid);
  transform: translateY(-3px);
  box-shadow: 0 14px 30px rgba(59,130,246,0.2);
}
.data-tile-title {
  color: var(--metallic-blue-bright);
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}
.data-tile-desc {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.7;
}

/* =========================================================
   Page Footer Nav (前後ページ送り)
   ========================================================= */
.page-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(59,130,246,0.15);
}
.page-nav a {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--metallic-blue-dark);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.3s;
  max-width: 320px;
}
.page-nav a:hover {
  border-color: var(--metallic-blue-mid);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(59,130,246,0.2);
}
.page-nav a.next { margin-left: auto; text-align: right; }
.page-nav .label {
  font-size: 0.7rem;
  color: var(--metallic-blue-light);
  letter-spacing: 2px;
  font-weight: 700;
  text-transform: uppercase;
}
.page-nav .title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--metallic-blue-bright);
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1024px) {
  .architecture {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .arch-connections { display: none; }
  .arch-data { width: 100%; }
}

@media (max-width: 768px) {
  body { overflow-x: hidden; }

  /* Sidebar -> compact horizontal banner at top */
  .sidebar {
    position: relative;
    width: 100%;
    height: auto;
    top: 0;
    border-right: none;
    border-bottom: 1px solid rgba(59,130,246,0.2);
    padding: 1.25rem 1rem;
    margin-top: 64px; /* clear fixed site header */
  }
  .sidebar-title { font-size: 1rem; margin-bottom: 0.2rem; }
  .sidebar-subtitle { font-size: 0.65rem; margin-bottom: 0.75rem; letter-spacing: 1px; }
  .sidebar-section-label { display: none; }
  .sidebar-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    justify-content: center;
  }
  .sidebar-nav li { margin: 0; }
  .sidebar-nav a {
    padding: 0.45rem 0.7rem;
    font-size: 0.78rem;
    gap: 0.4rem;
    border-radius: 999px;
    background: rgba(31,41,55,0.5);
  }
  .sidebar-nav .num {
    width: 18px; height: 18px;
    font-size: 0.6rem;
  }
  .sidebar-nav a.active {
    box-shadow: none;
    background: rgba(59,130,246,0.25);
  }
  .sidebar-footer { display: none; }

  /* Main */
  .main {
    margin-left: 0;
    padding: 2rem 1.1rem 3rem;
    max-width: 100%;
  }

  /* Headlines */
  .eyebrow { font-size: 0.7rem; letter-spacing: 2px; }
  .hero-headline { font-size: 1.75rem; line-height: 1.3; }
  .hero-sub { font-size: 0.95rem; }
  .section-title { font-size: 1.55rem; line-height: 1.3; }
  .section-lead { font-size: 0.92rem; }
  .subsection-label { margin-top: 2rem; font-size: 0.65rem; letter-spacing: 2px; }
  .subsection-title { font-size: 1.2rem; line-height: 1.4; }
  .subsection-lead { font-size: 0.9rem; }

  /* Architecture */
  .arch-card { padding: 1.2rem 1.1rem; }
  .arch-card-title { font-size: 1.05rem; }
  .arch-card-sub { font-size: 0.82rem; }
  .arch-card-bullets li { font-size: 0.8rem; }
  .data-card { padding: 1.25rem 1.1rem; }
  .data-card-title { font-size: 1rem; }

  /* Principles, value/risk/data tiles → 1 col */
  .principles,
  .value-grid,
  .risk-grid,
  .data-grid,
  .tool-grid,
  .tool-grid.cols-2,
  .evolution,
  .evolution.evolution-2col,
  .resource-grid {
    grid-template-columns: 1fr !important;
    gap: 1rem;
  }
  .principle, .value-tile, .risk-card, .data-tile, .tool-card {
    padding: 1.1rem 1.1rem;
  }
  .stage::after { display: none; }

  /* Callouts */
  .callout { padding: 1.25rem 1.25rem; margin-bottom: 1.5rem; }
  .callout-title { font-size: 1rem; }
  .callout-emphasis { font-size: 0.92rem; }
  .callout-text { font-size: 0.88rem; line-height: 1.7; }

  /* Resource (PDF) cards */
  .resource-card { flex-direction: column; padding: 1.15rem; }
  .resource-icon { width: 44px; height: 44px; }
  .resource-icon svg { width: 22px; height: 22px; }
  .resource-title { font-size: 1rem; }
  .resource-desc { font-size: 0.82rem; }

  /* Tool card */
  .tool-card { padding: 1.2rem; }
  .tool-name { font-size: 1rem; }
  .tool-tagline { font-size: 0.7rem; }
  .tool-desc { font-size: 0.85rem; }
  .tool-uses li { font-size: 0.82rem; }

  /* Misc */
  .and-more { font-size: 0.95rem; padding: 1rem 1.1rem; }
  .page-nav { flex-direction: column; }
  .page-nav a.next { margin-left: 0; text-align: left; }
}

/* =========================================================
   Resource (PDF) Cards
   ========================================================= */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.resource-card {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--metallic-blue-dark);
  border-radius: 18px;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}
.resource-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(59,130,246,0.12), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.resource-card:hover {
  border-color: var(--metallic-blue-mid);
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(59,130,246,0.22);
}
.resource-card:hover::after { opacity: 1; }

.resource-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: var(--gradient-metallic);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 8px 18px rgba(59,130,246,0.3), inset 0 1px 0 rgba(255,255,255,0.25);
  color: white;
  font-weight: 800;
  font-size: 0.7rem;
  letter-spacing: 1px;
}
.resource-icon svg {
  width: 26px;
  height: 26px;
  stroke: white;
  fill: none;
  stroke-width: 1.8;
}

.resource-body { flex: 1; min-width: 0; }
.resource-eyebrow {
  font-size: 0.7rem;
  letter-spacing: 1.5px;
  font-weight: 700;
  color: var(--metallic-blue-light);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}
.resource-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  line-height: 1.45;
}
.resource-desc {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.65;
  margin-bottom: 0.85rem;
}
.resource-meta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--metallic-blue-bright);
  font-weight: 600;
}
.resource-meta svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

/* =========================================================
   Adjust sidebar / main to clear the floating site header
   Header (`<nav>`) is ~75px tall; align sidebar flush below it.
   ========================================================= */
@media (min-width: 769px) {
  .sidebar {
    top: 75px;
    height: calc(100vh - 75px);
    padding-top: 3rem;
  }
  .main {
    padding-top: 3rem;
  }
}
/* Reset the global `nav` rules from /css/layout.css when nav is nested in the sidebar */
.sidebar nav {
  position: static;
  width: auto;
  background: transparent;
  backdrop-filter: none;
  padding: 0;
  border: none;
  border-bottom: none;
  z-index: auto;
}