/* ============================================================
   孤独・孤立実態調査 分析レポート — スタイルシート
   Light UI / Professional Design
   ============================================================ */

:root {
  --primary:       #1565c0;
  --primary-light: #1e88e5;
  --primary-dark:  #0d47a1;
  --accent:        #00897b;
  --accent-light:  #26a69a;
  --bg-body:       #f4f6f9;
  --bg-card:       #ffffff;
  --bg-alt:        #eef2f7;
  --text-main:     #1c2b3a;
  --text-sub:      #546e7a;
  --text-muted:    #78909c;
  --border:        #dce3ea;
  --shadow:        0 2px 12px rgba(0,0,0,0.07);
  --shadow-hover:  0 6px 24px rgba(0,0,0,0.14);
  --radius:        10px;
  --radius-sm:     6px;
}

/* ---- Reset / Base ---- */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Yu Gothic', 'Meiryo', 'Hiragino Kaku Gothic ProN', 'MS PGothic', sans-serif;
  background: var(--bg-body);
  color: var(--text-main);
  line-height: 1.75;
  font-size: 15px;
}

/* ---- Navigation ---- */
.nav-top {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--primary-dark);
  padding: 0 32px;
  display: flex;
  align-items: center;
  height: 54px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}
.nav-brand {
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  white-space: nowrap;
  margin-right: 28px;
  flex-shrink: 0;
}
.nav-links {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  flex: 1;
  scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a {
  color: rgba(255,255,255,0.80);
  text-decoration: none;
  padding: 5px 13px;
  border-radius: 16px;
  font-size: 13px;
  white-space: nowrap;
  transition: background .18s, color .18s;
}
.nav-links a:hover { background: rgba(255,255,255,0.18); color: #fff; }

/* ---- Hero ---- */
.hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 55%, #1976d2 100%);
  color: #fff;
  padding: 60px 32px 52px;
  text-align: center;
}
.hero-tag {
  display: inline-block;
  background: rgba(255,255,255,0.18);
  border: 1px solid rgba(255,255,255,0.38);
  border-radius: 20px;
  padding: 4px 18px;
  font-size: 12px;
  letter-spacing: .05em;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: 30px;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 10px;
}
.hero-sub {
  font-size: 17px;
  opacity: .92;
  margin-bottom: 6px;
}
.hero-meta {
  font-size: 13px;
  opacity: .72;
  margin-bottom: 44px;
}

/* KPI cards */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 880px;
  margin: 0 auto;
}
.kpi-card {
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.24);
  border-radius: var(--radius);
  padding: 22px 16px;
  text-align: center;
  backdrop-filter: blur(4px);
}
.kpi-num {
  font-size: 38px;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 6px;
}
.kpi-label {
  font-size: 12px;
  opacity: .85;
  line-height: 1.45;
}

/* ---- Layout ---- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ---- Sections ---- */
.report-section {
  padding: 60px 0;
}
.report-section:nth-child(odd) {
  background: var(--bg-body);
}
.report-section:nth-child(even) {
  background: var(--bg-alt);
}

.section-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 36px;
}
.section-num {
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  width: 30px; height: 30px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary-dark);
  border-bottom: 3px solid var(--primary);
  padding-bottom: 6px;
  flex: 1;
}

/* ---- Sub-sections ---- */
.sub-section { margin-bottom: 52px; }
.sub-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 18px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
}

/* ---- Figure cards ---- */
.fig-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: 20px;
  transition: box-shadow .2s;
}
.fig-card:hover { box-shadow: var(--shadow-hover); }
.fig-img { width: 100%; display: block; }
.fig-caption {
  padding: 12px 18px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-muted);
}
.fig-caption strong { color: var(--text-sub); }

/* ---- Insight boxes ---- */
.insight-box {
  background: #e3f2fd;
  border-left: 5px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 15px 20px;
  margin: 20px 0;
  font-size: 14px;
  color: var(--text-main);
}
.insight-box.green  { background: #e8f5e9; border-color: var(--accent); }
.insight-box.orange { background: #fff3e0; border-color: #fb8c00; }
.insight-box.red    { background: #fce4ec; border-color: #e53935; }
.insight-box p      { margin: 0; line-height: 1.7; }
.insight-box a      { color: var(--primary); }

/* ---- Data tables ---- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  font-size: 14px;
}
.data-table th {
  background: var(--primary);
  color: #fff;
  padding: 11px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 13px;
}
.data-table td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: #f0f7ff; }
.data-table td.highlight { color: #c62828; font-weight: 700; }
.data-table td.low       { color: #2e7d32; font-weight: 700; }

/* ---- Chart containers ---- */
.chart-container {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 20px;
  margin: 20px 0;
}
.chart-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-sub);
  margin-bottom: 14px;
  text-align: center;
}
.chart-wrap { position: relative; }

/* ---- Two column layout ---- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}
.three-col {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
}

/* ---- Stat mini cards ---- */
.stat-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin: 20px 0;
}
.stat-mini {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  padding: 16px 20px;
  min-width: 150px;
  text-align: center;
  flex: 1;
}
.stat-mini-num {
  font-size: 30px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}
.stat-mini-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 5px;
  line-height: 1.4;
}

/* ---- Callout ---- */
.callout {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  margin: 20px 0;
  border-left: 5px solid var(--primary);
}
.callout.orange { border-color: #fb8c00; }
.callout.red    { border-color: #e53935; }
.callout-icon   { font-size: 22px; line-height: 1.5; flex-shrink: 0; }
.callout-text h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 5px;
  color: var(--text-main);
}
.callout-text p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
  margin: 0;
}
.callout-text a { color: var(--primary); }

/* ---- Badge ---- */
.badge {
  display: inline-block;
  padding: 1px 9px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
}
.badge-red   { background: #ffcdd2; color: #c62828; }
.badge-blue  { background: #bbdefb; color: #1565c0; }
.badge-green { background: #c8e6c9; color: #2e7d32; }

/* ---- Factor ranking ---- */
.factor-list { list-style: none; margin: 16px 0; }
.factor-item {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.factor-rank {
  font-size: 24px;
  font-weight: 800;
  color: var(--primary);
  min-width: 32px;
  text-align: center;
}
.factor-bar-wrap { flex: 1; }
.factor-label { font-size: 14px; font-weight: 600; margin-bottom: 2px; }
.factor-desc  { font-size: 12px; color: var(--text-muted); }
.factor-bar-bg {
  background: var(--border);
  border-radius: 4px;
  height: 8px;
  margin-top: 6px;
  overflow: hidden;
}
.factor-bar {
  height: 100%;
  border-radius: 4px;
  background: var(--primary);
  width: 0;
  transition: width 1.2s ease;
}

/* ---- Cycle diagram ---- */
.cycle-box {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 40px;
  margin: 24px 0;
  display: flex;
  justify-content: center;
}
.cycle-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  max-width: 380px;
  width: 100%;
}
.cycle-step {
  width: 100%;
  background: #e3f2fd;
  border: 2px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 11px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary-dark);
  text-align: center;
}
.cycle-step.danger {
  background: #fce4ec;
  border-color: #e53935;
  color: #c62828;
}
.cycle-arrow-down {
  font-size: 22px;
  color: var(--primary);
  line-height: 1;
}
.cycle-return {
  margin-top: 6px;
  font-size: 12px;
  color: var(--text-muted);
  border: 1px dashed var(--border);
  border-radius: 20px;
  padding: 4px 18px;
}

/* ---- Policy cards ---- */
.policy-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 20px 0;
}
.policy-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border-top: 4px solid var(--primary);
}
.policy-card.orange { border-top-color: #fb8c00; }
.policy-card.red    { border-top-color: #e53935; }
.policy-card.green  { border-top-color: var(--accent); }
.policy-target {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 4px;
}
.policy-card.red    .policy-target { color: #c62828; }
.policy-card.orange .policy-target { color: #e65100; }
.policy-card.green  .policy-target { color: var(--accent); }
.policy-issue  { font-size: 12px; color: var(--text-muted); margin-bottom: 8px; }
.policy-action { font-size: 14px; color: var(--text-main); line-height: 1.6; }

/* ---- References section ---- */
.ref-section {
  background: var(--primary-dark);
  color: rgba(255,255,255,.9);
  padding: 56px 0;
}
.ref-section .section-header { margin-bottom: 32px; }
.ref-section .section-title {
  color: #fff;
  border-color: rgba(255,255,255,.35);
}
.ref-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.ref-card {
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.ref-card h3 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 12px;
  opacity: .92;
}
.ref-card ul { list-style: none; font-size: 13px; }
.ref-card ul li {
  padding: 5px 0;
  border-bottom: 1px solid rgba(255,255,255,.1);
  opacity: .82;
  line-height: 1.5;
}
.ref-card ul li:last-child { border-bottom: none; }
.ref-card a { color: #90caf9; text-decoration: none; }
.ref-card a:hover { text-decoration: underline; }

/* ---- Footer ---- */
footer {
  background: #0a2340;
  color: rgba(255,255,255,.65);
  padding: 28px 32px;
  text-align: center;
  font-size: 13px;
  line-height: 1.8;
}
footer strong { color: rgba(255,255,255,.9); }
.footer-credit {
  width: 100%;
  text-align: center;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid rgba(255,255,255,.12);
}

/* ---- Scroll animation ---- */
.fade-in {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s ease, transform .5s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .kpi-grid    { grid-template-columns: repeat(2, 1fr); }
  .two-col     { grid-template-columns: 1fr; }
  .three-col   { grid-template-columns: 1fr 1fr; }
  .policy-grid { grid-template-columns: 1fr; }
  .ref-grid    { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .kpi-grid  { grid-template-columns: repeat(2, 1fr); }
  .three-col { grid-template-columns: 1fr; }
  .hero h1   { font-size: 22px; }
  .nav-top   { padding: 0 14px; }
  .hero      { padding: 40px 18px 32px; }
  .container { padding: 0 16px; }
}