:root {
  --navy: #031e22;
  --navy-light: #0a3038;
  --blue-700: #2563eb;
  --blue-600: #2563eb;
  --blue-50: #eff6ff;
  --blue-100: #dbeafe;
  --gray-900: #0f172a;
  --gray-700: #334155;
  --gray-500: #64748b;
  --gray-300: #cbd5e1;
  --gray-200: #e2e8f0;
  --gray-100: #f1f5f9;
  --red: #ef4444;
  --bb-gradient: linear-gradient(90deg, #3661e1 0%, #23448d 52%, #10263a 100%);
  --bg: #f5f6f7;
  --white: #ffffff;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Outfit", "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Meiryo", system-ui, sans-serif;
  color: var(--gray-700);
  background: var(--bg);
  line-height: 1.85;
  font-size: 16px;
}

.container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 50;
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  text-decoration: none;
}
.brand:hover { opacity: 0.75; }
.brand-logo { height: 34px; width: auto; }
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
  text-decoration: none;
  color: var(--navy);
  padding-left: 14px;
  border-left: 1px solid var(--gray-200);
}
.brand-title { font-weight: 600; font-size: 15px; letter-spacing: 0.02em; }
.brand-sub { font-size: 11px; color: var(--gray-500); letter-spacing: 0.06em; }

/* Hero */
.hero {
  background: var(--bb-gradient);
  color: var(--white);
  padding: 56px 0 64px;
  text-align: center;
}
.hero-title {
  font-size: 32px;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}
.hero-lead { font-size: 14.5px; font-weight: 300; color: rgba(255, 255, 255, 0.72); margin-bottom: 30px; }
.search-box {
  position: relative;
  max-width: 560px;
  margin: 0 auto;
}
.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--gray-500);
  pointer-events: none;
}
#search-input {
  width: 100%;
  padding: 15px 18px 15px 48px;
  border: none;
  border-radius: 999px;
  font-size: 15px;
  font-family: inherit;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  outline: none;
}
#search-input:focus { box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.5), 0 4px 20px rgba(0, 0, 0, 0.25); }

/* Layout */
.main-layout {
  padding-top: 36px;
  padding-bottom: 56px;
  min-height: 40vh;
}

/* トップのカテゴリカード */
.top-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.cat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 6px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 20px 22px;
  text-decoration: none;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}
.cat-card:hover {
  border-color: var(--blue-600);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.12);
  transform: translateY(-2px);
}
.cat-card-icon { line-height: 1; margin-bottom: 6px; color: var(--blue-600); }
.cat-card-icon .icon { width: 36px; height: 36px; }
.heading-icon {
  width: 22px;
  height: 22px;
  color: var(--blue-600);
  flex-shrink: 0;
}
.btn-icon { width: 13px; height: 13px; flex-shrink: 0; }
.cat-card-title {
  font-size: 16.5px;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: 0.02em;
}
.cat-card-desc { font-size: 13px; color: var(--gray-500); line-height: 1.6; }
.cat-card-count {
  margin-top: 6px;
  font-size: 11.5px;
  color: var(--blue-700);
  background: var(--blue-50);
  border-radius: 999px;
  padding: 2px 10px;
}

/* カテゴリページの戻るリンク */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 18px;
  font-size: 13.5px;
  color: var(--gray-500);
  text-decoration: none;
  border: 1px solid var(--gray-200);
  background: var(--white);
  border-radius: 999px;
  padding: 5px 14px;
}
.back-link:hover { color: var(--blue-700); border-color: var(--blue-600); }

.search-summary {
  font-size: 13.5px;
  color: var(--gray-500);
  margin-bottom: 14px;
}

/* FAQ content */
.category-section { margin-bottom: 44px; scroll-margin-top: 76px; }
.category-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--navy);
  margin-bottom: 16px;
  padding: 2px 0 10px 14px;
  border-left: 4px solid var(--blue-600);
  border-bottom: 1px solid var(--gray-200);
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  margin-bottom: 10px;
  box-shadow: var(--shadow);
  overflow: hidden;
  scroll-margin-top: 130px;
}
.faq-item.highlight { border-color: var(--blue-600); box-shadow: 0 0 0 2px var(--blue-100); }

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 17px 18px;
  background: none;
  border: none;
  cursor: pointer;
  font: inherit;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--gray-900);
  text-align: left;
  line-height: 1.6;
}
.faq-question:hover { background: var(--blue-50); }
.faq-question .q-mark,
.a-mark {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 800;
  font-family: Georgia, serif;
}
.faq-question .q-mark {
  background: var(--blue-600);
  color: var(--white);
  font-family: "Outfit", Georgia, serif;
}
.a-mark {
  background: var(--red);
  color: var(--white);
  font-family: "Outfit", Georgia, serif;
}
.faq-question .chevron {
  margin-left: auto;
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  color: var(--gray-500);
  transition: transform 0.2s;
}
.faq-item.open .chevron { transform: rotate(180deg); }

.faq-answer {
  display: none;
  color: var(--gray-700);
  font-size: 15.5px;
}
.faq-item.open .faq-answer { display: block; }
.answer-row {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin: 0 18px;
  padding: 16px 0 18px;
  border-top: 2px dashed var(--gray-200);
}
.answer-body { flex: 1; min-width: 0; }
.faq-answer p { margin-bottom: 10px; }
.faq-answer p:last-child { margin-bottom: 0; }
.faq-answer ul, .faq-answer ol { padding-left: 4px; margin: 0 0 12px; list-style: none; }
.faq-answer li { margin-bottom: 6px; padding-left: 26px; position: relative; }
.faq-answer ul li::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0.72em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--blue-600);
}
.faq-answer ol { counter-reset: step; }
.faq-answer ol li { padding-left: 32px; counter-increment: step; }
.faq-answer ol li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.22em;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--blue-100);
  color: var(--blue-700);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.faq-answer strong {
  color: var(--blue-700);
  background: linear-gradient(transparent 68%, var(--blue-100) 68%);
  padding: 0 2px;
  font-weight: 700;
}
.faq-answer .note {
  background: #fffbeb;
  border-left: 4px solid #f59e0b;
  border-radius: 0 8px 8px 0;
  padding: 10px 14px;
  color: #78350f;
  font-size: 14.5px;
}
.faq-answer .note strong { color: #92400e; background: none; }
.answer-subhead {
  font-weight: 700;
  color: var(--gray-900);
  margin: 14px 0 8px !important;
  padding-left: 10px;
  border-left: 4px solid var(--blue-600);
  font-size: 15px;
}

.answer-footer {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--gray-100);
}
.copy-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12.5px;
  color: var(--gray-500);
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: 999px;
  cursor: pointer;
  padding: 3px 12px;
}
.feedback {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--gray-500);
  margin-left: auto;
}
.feedback.done { color: var(--gray-500); }
.fb-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font: inherit;
  font-size: 12.5px;
  color: var(--gray-700);
  background: var(--white);
  border: 1px solid var(--gray-300);
  border-radius: 999px;
  cursor: pointer;
  padding: 3px 12px;
}
.fb-btn:hover { background: var(--blue-50); border-color: var(--blue-600); color: var(--blue-700); }
.copy-link:hover { color: var(--blue-700); }

mark {
  background: #fef08a;
  border-radius: 2px;
  padding: 0 1px;
}

.no-results {
  text-align: center;
  color: var(--gray-500);
  padding: 48px 0;
}
.loading { color: var(--gray-500); }

/* Feature guide */
.heading-sub {
  font-size: 13px;
  font-weight: 400;
  color: var(--gray-500);
  margin-left: 4px;
  letter-spacing: 0.04em;
}
.guide-group-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--gray-500);
  letter-spacing: 0.08em;
  margin: 20px 0 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.guide-group-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--gray-200);
}
.guide-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.guide-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px;
}
.guide-page-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 4px;
  padding-left: 10px;
  border-left: 3px solid var(--blue-600);
}
.guide-purpose {
  font-size: 14px;
  color: var(--gray-700);
  margin-bottom: 8px;
}
.guide-see {
  font-size: 13px;
  color: var(--gray-500);
  background: var(--gray-100);
  border-radius: 8px;
  padding: 8px 12px;
  line-height: 1.7;
}
.guide-see-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  color: var(--blue-600);
  letter-spacing: 0.08em;
  margin-bottom: 2px;
}
.guide-links { margin-top: 10px; display: flex; flex-direction: column; gap: 4px; }
.guide-faq-link { font-size: 13px; }
.faq-link {
  color: var(--blue-600);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--blue-100);
  cursor: pointer;
}
.faq-link:hover { text-decoration-color: var(--blue-600); }
.guide-note {
  margin-top: 16px;
  font-size: 13px;
  color: var(--gray-500);
}

/* Contact CTA */
.contact-cta {
  background: var(--white);
  border-top: 1px solid var(--gray-200);
  padding: 44px 0;
  text-align: center;
}
.contact-cta h2 {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--navy);
  margin-bottom: 8px;
}
.contact-cta p { color: var(--gray-500); font-size: 14px; }

/* Footer */
.site-footer {
  background: var(--bb-gradient);
  color: rgba(255, 255, 255, 0.65);
  padding: 26px 0;
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.05em;
}

/* Mobile */
@media (max-width: 768px) {
  .main-layout { padding-top: 24px; }
  .top-cards { grid-template-columns: 1fr 1fr; gap: 10px; }
  .cat-card { padding: 20px 12px 16px; }
  .cat-card-icon { font-size: 28px; }
  .cat-card-title { font-size: 15px; }
  .cat-card-desc { font-size: 12px; }
  .hero { padding: 32px 0 40px; }
  .hero-title { font-size: 22px; }
  .a-mark { width: 26px; height: 26px; font-size: 13px; }
  .answer-row { gap: 10px; }
  .category-heading { font-size: 18px; }
  .guide-grid { grid-template-columns: 1fr; }
}