/* Shared statistics cards and progressive topic navigation. */
[hidden] { display: none !important; }
.key-band { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; margin: 32px 0 12px; }
.key { display: block; padding: 22px 12px; border-top: 1px solid var(--line); text-align: center; text-decoration: none; color: inherit; }
.num { display: block; font-variant-numeric: tabular-nums; font-size: clamp(1.85rem, 3.6vw, 2.6rem); font-weight: 800; letter-spacing: -.025em; line-height: 1.3; color: var(--accent-dark); }
.num small { font-size: .46em; margin-left: .12em; font-weight: 700; }
.cap { display: block; margin-top: 8px; font-size: .9rem; line-height: 1.65; }
.sub { display: block; margin-top: 5px; font-size: .76rem; color: var(--muted); line-height: 1.7; }
.band-source { font-size: .8rem; margin: 18px 0 0; color: var(--muted); }
.site-hero .key { border-color: #ffffff30; border-radius: 0; }
.site-hero .key:hover { background: #ffffff0b; }
.site-hero .num { color: #e2ccff; }
.site-hero .key:nth-child(2) .num { color: #fbd786; }
.site-hero .key:nth-child(3) .num { color: #a5e5ed; }
.site-hero .key:nth-child(4) .num { color: #c6dcff; }
.site-hero .cap { color: #edf0f8; }
.site-hero .sub, .site-hero .band-source { color: #c1cce0; }
.stats-main { padding-top: 32px; gap: 32px; }
.stats-main > section { margin: 0; padding: clamp(22px, 4vw, 42px); background: var(--surface); border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 3px 18px #192b4410; min-width: 0; }
.stats-main p { line-height: 1.95; }
.stats-main h2 { text-wrap: pretty; }
.stats-main .topic-section { border-top: 3px solid #c8b8ee; position: relative; }
.topic-section[data-topic="reading"] { border-top-color: #838ec4; }
.topic-section[data-topic="market"] { border-top-color: #aa8bce; }
.topic-section[data-topic="platforms"] { border-top-color: #62a69e; }
.topic-section[data-topic="ai"] { border-top-color: #779bd1; }
.topic-anchor { position: absolute; top: 0; scroll-margin-top: 100px; }
.section-label { display: inline-flex; align-items: center; flex-wrap: wrap; gap: 10px; margin: 0 0 18px; color: var(--accent); font-size: .75rem; font-weight: 800; letter-spacing: .12em; }
.section-label > span { font-size: .73rem; letter-spacing: .015em; padding: 2px 8px; border-radius: 4px; background: var(--accent-soft); font-weight: 500; }
.survey-meta { color: var(--muted); font-size: .83rem; margin: 0 0 24px; }
.overview-heading { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.count-label { font-variant-numeric: tabular-nums; padding: 3px 12px; background: var(--accent-soft); color: var(--accent-dark); border-radius: 999px; font-size: .8rem; white-space: nowrap; }
.topic-overview > p:not(.section-label):not(.sr-only) { color: var(--muted); margin-bottom: 20px; }
.study-index { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.study-card { display: flex; flex-direction: column; gap: 8px; padding: 22px; border: 1px solid var(--line); border-radius: 10px; background: #fcfbff; color: var(--ink); text-decoration: none; transition: border-color .16s ease, box-shadow .16s ease; }
.study-card:hover { border-color: var(--accent); box-shadow: 0 5px 20px #4a337314; }
.study-card-kicker { display: flex; gap: 8px; color: var(--muted); font-size: .77rem; }
.study-card h3 { font-size: 1rem; margin: 2px 0 6px; }
.study-card .num { font-size: 2rem; }
.study-card .cap { margin: 0; font-size: .83rem; }
.study-card .sub { margin-top: auto; padding-top: 6px; }
.study-card-action { font-size: .78rem; color: var(--accent); margin-top: 7px; }
.toc ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 24px; margin: 20px 0 0; padding-left: 1.4em; font-size: .9rem; }
.big-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin: 24px 0; }
.stat { padding: 24px 16px; background: var(--surface-strong); text-align: center; border-radius: 10px; }
.stat .cap { font-size: .84rem; color: var(--muted); }
.bars { padding: 24px; margin: 24px 0; background: var(--surface-strong); border-radius: 10px; }
.bars figcaption { font-size: .85rem; font-weight: 700; margin-bottom: 18px; }
.bar-row { display: grid; grid-template-columns: 5.5em minmax(0, 1fr) 4.5em; align-items: center; gap: 12px; margin: 12px 0; font-size: .87rem; }
.bar-row > strong { text-align: right; font-variant-numeric: tabular-nums; }
.bar-track { height: 12px; background: #dfe4ef; border-radius: 99px; overflow: hidden; }
.bar-fill { display: block; height: 100%; width: calc(var(--v) * 1%); background: var(--accent); border-radius: inherit; }
.data-table-wrap { overflow-x: auto; margin: 24px 0; border: 1px solid var(--line); border-radius: 8px; }
.data-table { width: 100%; min-width: 460px; border-collapse: collapse; font-size: .89rem; background: white; }
.data-table caption { caption-side: bottom; text-align: left; color: var(--muted); font-size: .78rem; padding: 12px 16px; line-height: 1.8; background: #fafbfe; }
.data-table th, .data-table td { border: 0; border-bottom: 1px solid var(--line); padding: 13px 16px; text-align: left; vertical-align: top; }
.data-table thead th { background: var(--navy); color: white; font-size: .8rem; font-weight: 600; }
.data-table tbody th { font-weight: 500; max-width: 22em; }
.data-table tbody tr:nth-child(even) { background: #f6f8fc; }
.data-table .n { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
.memo { padding: 20px 24px; margin: 24px 0; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 8px 8px 0; font-size: .91rem; line-height: 1.9; }
.memo strong { display: block; color: var(--accent-dark); margin-bottom: 6px; font-size: .8rem; }
.method-note { padding: 16px 0; border-top: 1px solid var(--line); font-size: .85rem; color: var(--muted); }
.method-note summary { cursor: pointer; font-weight: 600; color: var(--ink); }
.method-note p { margin: 12px 0 0; }
.src { margin: 18px 0 0; font-size: .79rem; color: var(--muted); overflow-wrap: anywhere; }
.summary-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; margin-top: 22px; }
.summary-grid .no { color: var(--accent); font-size: .8rem; font-weight: 700; }
.summary-grid h3 { margin: 8px 0; }
.summary-grid p { font-size: .9rem; color: var(--muted); margin: 0; }
.stats-teaser { padding: 30px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.stats-teaser .key-band { margin: 16px 0 0; }
.stats-teaser .key { text-align: left; padding-left: 0; }
.stats-teaser .num { font-size: 1.9rem; }
.stats-teaser .teaser-link { margin: 18px 0 0; }
.stats-main > .related-reading { padding: 26px; }

@media (max-width: 850px) {
  .study-index { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .key-band { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .big-stats { gap: 8px; }
  .stat { padding: 18px 10px; }
  .stat .num { font-size: 1.65rem; }
}
@media (max-width: 540px) {
  .stats-main { padding-top: 20px; gap: 22px; }
  .study-index, .summary-grid, .toc ol { grid-template-columns: 1fr; }
  .study-card { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 6px 16px; padding: 18px; }
  .study-card-kicker, .study-card h3 { grid-column: 1; }
  .study-card .num { grid-column: 2; grid-row: 1 / 3; align-self: center; font-size: 1.7rem; }
  .study-card .cap, .study-card .sub, .study-card-action { grid-column: 1 / -1; }
  .big-stats { grid-template-columns: 1fr; }
  .stat { display: flex; align-items: center; gap: 18px; text-align: left; padding: 18px; }
  .stat .num { flex: 0 0 42%; font-size: 1.8rem; }
  .stat .cap { margin-top: 0; }
  .bars { padding: 16px; }
  .bar-row { gap: 8px; font-size: .8rem; }
  .memo { padding: 18px; }
  .data-table-wrap::before { content: "表は左右にスクロールできます"; display: block; padding: 8px 12px; color: var(--muted); font-size: .72rem; background: var(--surface-strong); }
}
@media (prefers-reduced-motion: reduce) {
  .study-card { transition: none; }
}
@media print {
  .view-switcher, .study-index, .ad-slot, .portal-bar, .skip-link { display: none !important; }
  .stats-main .topic-section[hidden] { display: block !important; }
  .stats-main > section { box-shadow: none; border: 0; padding: 20px 0; }
  .data-table-wrap { overflow: visible; }
  .data-table { min-width: 0; }
  .big-stats, .data-table, .memo { break-inside: avoid; }
}