:root {
  --bg: #eef2fb;
  --surface: #ffffff;
  --surface-alt: #e3e9f8;
  --border: #d5ddf0;
  --ink: #172140;
  --ink-soft: #5b6b8c;
  --ink-faint: #8592ac;
  --accent: #3049c9;
  --accent-soft: #e6eaff;
  --accent-ink: #ffffff;
  --shadow: 0 1px 2px rgba(23, 33, 64, 0.04), 0 8px 24px rgba(23, 33, 64, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #070b16;
    --surface: #101a2c;
    --surface-alt: #182338;
    --border: #223056;
    --ink: #e8ecf9;
    --ink-soft: #94a3c4;
    --ink-faint: #64719a;
    --accent: #8098ff;
    --accent-soft: #1c2748;
    --accent-ink: #0b1226;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.35);
  }
}
:root[data-theme="dark"] {
  --bg: #070b16;
  --surface: #101a2c;
  --surface-alt: #182338;
  --border: #223056;
  --ink: #e8ecf9;
  --ink-soft: #94a3c4;
  --ink-faint: #64719a;
  --accent: #8098ff;
  --accent-soft: #1c2748;
  --accent-ink: #0b1226;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.35);
}
:root[data-theme="light"] {
  --bg: #eef2fb;
  --surface: #ffffff;
  --surface-alt: #e3e9f8;
  --border: #d5ddf0;
  --ink: #172140;
  --ink-soft: #5b6b8c;
  --ink-faint: #8592ac;
  --accent: #3049c9;
  --accent-soft: #e6eaff;
  --accent-ink: #ffffff;
  --shadow: 0 1px 2px rgba(23, 33, 64, 0.04), 0 8px 24px rgba(23, 33, 64, 0.06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Yu Gothic UI", "Noto Sans JP", "Segoe UI", sans-serif;
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: clamp(28px, 6vw, 56px) clamp(18px, 5vw, 32px) 64px;
}

.hero { text-align: center; margin-bottom: 30px; }
.wordmark {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin: 0 0 14px;
}
h1 {
  font-size: clamp(22px, 5vw, 30px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.4;
  margin: 0;
  text-wrap: balance;
}

.search {
  max-width: 520px;
  margin: 0 auto 22px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 11px;
  padding: 13px 18px;
}
.search svg { flex-shrink: 0; opacity: 0.55; }
.search input {
  border: none;
  background: none;
  outline: none;
  font-size: 14.5px;
  color: var(--ink);
  width: 100%;
  font-family: inherit;
}
.search input::placeholder { color: var(--ink-faint); }

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 14px;
}
.tab {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-soft);
  font-size: 13.5px;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: 999px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.tab .count {
  font-size: 11.5px;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}
.tab:hover { border-color: var(--accent); }
.tab:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}
.tab.active .count { color: var(--accent-ink); opacity: 0.75; }

.panel-intro {
  text-align: center;
  max-width: 480px;
  margin: 4px auto 20px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.search-status {
  text-align: center;
  font-size: 12.5px;
  color: var(--ink-faint);
  margin: 0 0 16px;
}

.qa-list { display: flex; flex-direction: column; gap: 10px; }

.qa-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  padding: 3px 18px;
}
.qa-item summary {
  list-style: none;
  cursor: pointer;
  padding: 15px 0;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
}
.qa-item summary::-webkit-details-marker { display: none; }
.qa-item .q-mark {
  flex-shrink: 0;
  width: 22px; height: 22px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12.5px;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
}
.qa-item .cat-tag {
  font-size: 10.5px;
  font-weight: 700;
  color: var(--ink-faint);
  background: var(--surface-alt);
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 999px;
  flex-shrink: 0;
  margin-top: 1px;
}
.qa-item .chevron {
  margin-left: auto;
  color: var(--ink-faint);
  transition: transform 0.15s ease;
  flex-shrink: 0;
}
.qa-item[open] summary .chevron { transform: rotate(180deg); }
.qa-item .answer {
  padding: 0 0 18px 34px;
  font-size: 13.8px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 62ch;
  white-space: pre-line;
}

.chart-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-alt);
  padding: 20px 22px 22px;
  margin-bottom: 18px;
}
.chart-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.chart-head h2 {
  font-size: 15px;
  font-weight: 800;
  margin: 0;
  color: var(--ink);
}
.chart-tag {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--ink-faint);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 3px 9px;
  border-radius: 999px;
}
.app-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
@media (max-width: 560px) {
  .app-grid { grid-template-columns: 1fr; }
}
.app-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px 16px;
}
.app-card-head {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--border);
}
.app-badge {
  flex-shrink: 0;
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--badge, var(--accent));
  color: #ffffff;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.02em;
  display: flex; align-items: center; justify-content: center;
}
.app-name {
  font-size: 13.5px;
  font-weight: 800;
  color: var(--ink);
  margin: 0 0 3px;
}
.app-name-ja {
  font-weight: 500;
  color: var(--ink-faint);
  font-size: 11.5px;
}
.app-show {
  margin: 0;
  font-size: 11.5px;
  color: var(--ink-faint);
}
.app-show strong { color: var(--accent); font-weight: 700; }
.app-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.app-steps li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-soft);
}
.mini-num {
  flex-shrink: 0;
  width: 16px; height: 16px;
  margin-top: 1px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 10px;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
}
.chart-footnote {
  margin: 14px 0 0;
  font-size: 11.5px;
  color: var(--ink-faint);
}

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--ink-faint);
  font-size: 13.5px;
}

.error-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--ink-soft);
  font-size: 13.5px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

footer {
  text-align: center;
  margin-top: 40px;
  font-size: 12px;
  color: var(--ink-faint);
}
footer a { color: var(--accent); }