:root {
  --bg: #f4f7fa;
  --surface: #ffffff;
  --ink: #17202a;
  --muted: #596778;
  --line: #d9e2ec;
  --teal: #0f766e;
  --teal-dark: #115e59;
  --blue: #2563eb;
  --amber: #b45309;
  --amber-soft: #fff7ed;
  --green-soft: #ecfdf5;
  --radius: 8px;
  --max: 1120px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", Meiryo, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.8;
}
a { color: var(--teal-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }
.container { max-width: var(--max); margin: 0 auto; padding: 0 18px; }
.site-header { background: #102a43; color: #fff; border-bottom: 4px solid var(--teal); }
.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 13px 18px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.brand {
  color: #fff;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-width: 148px;
  font-weight: 800;
  font-size: 1.2rem;
}
.brand:hover { text-decoration: none; }
.brand span span { color: #a7f3d0; }
.header-search { display: flex; flex: 1 1 320px; min-width: 180px; }
.header-search input,
.search-page-form input {
  flex: 1;
  min-width: 0;
  border: 1px solid transparent;
  border-radius: var(--radius) 0 0 var(--radius);
  padding: 10px 12px;
  font: inherit;
  line-height: 1.35;
}
.header-search button {
  border: 0;
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--teal);
  color: #fff;
  font-weight: 700;
  padding: 0 18px;
  cursor: pointer;
}
.ask-button,
.primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border: 0;
  border-radius: var(--radius);
  background: var(--teal);
  color: #fff;
  font: inherit;
  font-weight: 700;
  padding: 9px 18px;
  cursor: pointer;
  white-space: nowrap;
}
.ask-button { background: #fff; color: #102a43; }
.ask-button:hover,
.primary-button:hover { text-decoration: none; filter: brightness(.96); }
.primary-button:disabled { opacity: .55; cursor: progress; }
.intro-band {
  margin: 26px 0 22px;
  padding: 22px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 360px);
  gap: 18px;
  align-items: center;
  background: #e8f3f1;
  border: 1px solid #c8dfdc;
  border-radius: var(--radius);
}
.intro-band h1 { margin: 0 0 6px; font-size: 1.55rem; line-height: 1.45; }
.intro-band p { margin: 0; color: #30445a; }
.eyebrow {
  font-size: .78rem;
  font-weight: 800;
  color: var(--teal-dark);
}
.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.stat-grid span {
  display: grid;
  gap: 3px;
  min-height: 72px;
  place-items: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: .88rem;
}
.stat-grid strong { color: var(--ink); font-size: 1.35rem; line-height: 1; }
.page-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 22px;
  align-items: start;
  margin-bottom: 44px;
}
.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 18px;
}
.narrow-panel { max-width: 760px; margin-left: auto; margin-right: auto; }
.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 10px;
  margin-bottom: 12px;
}
.section-heading h1,
.section-heading h2 {
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.45;
}
.lead { color: var(--muted); margin-top: 0; }
.question-list { list-style: none; margin: 0; padding: 0; }
.question-row { padding: 13px 0; border-bottom: 1px dashed var(--line); }
.question-row:last-child { border-bottom: 0; }
.question-title {
  display: block;
  color: var(--ink);
  font-weight: 700;
  line-height: 1.6;
}
.question-title:hover { color: var(--teal-dark); }
.question-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 6px;
  color: var(--muted);
  font-size: .84rem;
}
.badge {
  display: inline-flex;
  align-items: center;
  min-height: 22px;
  padding: 1px 8px;
  margin-right: 7px;
  border-radius: 999px;
  font-size: .76rem;
  font-weight: 800;
  vertical-align: 1px;
}
.badge-resolved { background: var(--amber-soft); color: var(--amber); border: 1px solid #fdba74; }
.badge-open { background: var(--green-soft); color: var(--teal-dark); border: 1px solid #99f6e4; }
.side-list { list-style: none; margin: 0; padding: 0; }
.side-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  border-bottom: 1px dashed var(--line);
  padding: 9px 0;
}
.side-list li:last-child { border-bottom: 0; }
.side-list span { color: var(--muted); font-size: .82rem; }
.notice-panel p { margin-bottom: 0; color: var(--muted); }
.breadcrumbs { margin: 16px 0 0; color: var(--muted); font-size: .84rem; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 7px; margin: 0; padding: 0; list-style: none; }
.breadcrumbs li + li::before { content: ">"; margin-right: 7px; color: #9aa8b6; }
.qa-panel { min-height: 190px; }
.qa-marker {
  float: left;
  width: 42px;
  height: 42px;
  margin: 4px 14px 6px 0;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--teal);
  color: #fff;
  font-weight: 900;
  font-size: 1.25rem;
}
.qa-marker.a { background: #64748b; }
.qa-marker.best { background: var(--amber); }
.question-headline { margin: 0 0 10px; font-size: 1.42rem; line-height: 1.55; }
.question-body,
.answer-body { overflow-wrap: anywhere; }
.answer-section { clear: both; }
.answer-card {
  position: relative;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 12px;
  background: #fff;
}
.best-answer { border-color: #fdba74; background: #fffaf2; }
.best-label {
  display: inline-flex;
  min-height: 24px;
  align-items: center;
  padding: 1px 9px;
  margin: 0 0 10px;
  border-radius: 999px;
  background: var(--amber);
  color: #fff;
  font-size: .78rem;
  font-weight: 800;
}
.stack-form { display: grid; gap: 14px; }
.form-row {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) auto;
  gap: 12px;
  align-items: end;
}
.form-field { display: grid; gap: 5px; }
.form-field label { font-weight: 700; font-size: .9rem; }
.form-field input,
.form-field textarea,
.form-field select,
.search-page-form input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  font: inherit;
  padding: 10px 12px;
}
.form-field textarea { min-height: 150px; resize: vertical; }
.form-message { min-height: 1.5em; margin: 0; color: var(--muted); font-weight: 700; }
.form-message.error { color: #be123c; }
.search-page-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  margin-bottom: 18px;
}
.search-results mark { background: #fef3c7; padding: 0 2px; }
.muted { color: var(--muted); }
.site-footer {
  margin-top: 38px;
  background: #102a43;
  color: #dbe7f2;
  font-size: .88rem;
}
.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 24px 18px;
}
.footer-inner nav { display: flex; gap: 14px; flex-wrap: wrap; }
.footer-inner a { color: #fff; }
@media (max-width: 860px) {
  .header-inner { flex-wrap: wrap; }
  .brand { min-width: 0; }
  .header-search { order: 3; flex-basis: 100%; }
  .intro-band,
  .page-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .form-row,
  .search-page-form { grid-template-columns: 1fr; }
  .ask-button { margin-left: auto; }
}
@media (max-width: 520px) {
  .container { padding: 0 14px; }
  .panel,
  .intro-band { padding: 16px; }
  .intro-band h1 { font-size: 1.28rem; }
  .stat-grid { grid-template-columns: 1fr; }
  .question-headline { font-size: 1.22rem; }
  .section-heading { align-items: flex-start; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}