/* ============================================
   D-Research - guide.css (解説ページ専用スタイル)
   ============================================ */

/* ---------- Back to Top nav button ---------- */
.btn-back-top {
  border: 1px solid rgba(255,255,255,0.35) !important;
  color: var(--text-light) !important;
  padding: 5px 14px !important;
  border-radius: 6px !important;
  font-size: 0.8rem !important;
  font-weight: 500 !important;
  transition: border-color var(--transition), background var(--transition), color var(--transition) !important;
  white-space: nowrap;
  letter-spacing: 0.3px;
}

.btn-back-top:hover {
  border-color: var(--white) !important;
  background: rgba(255,255,255,0.1) !important;
  color: var(--white) !important;
}

/* ---------- Page Hero ---------- */
.guide-hero {
  position: relative;
  background: var(--navy);
  min-height: 52vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 76px;
}

.guide-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 50%, rgba(232,119,26,0.12) 0%, transparent 70%),
    radial-gradient(ellipse 60% 80% at 20% 80%, rgba(26,51,86,0.8) 0%, transparent 60%);
  z-index: 0;
}

.guide-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,22,40,0.95) 0%, rgba(18,37,63,0.85) 100%);
  z-index: 1;
}

.guide-hero-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 60px 32px;
}

.guide-hero-label {
  font-family: 'Oswald', sans-serif;
  color: var(--orange);
  font-size: 0.85rem;
  letter-spacing: 5px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.guide-hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.guide-hero-desc {
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  color: var(--text-light);
  line-height: 1.9;
  margin-bottom: 32px;
}

.guide-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.guide-tag {
  display: inline-block;
  background: rgba(232,119,26,0.18);
  border: 1px solid rgba(232,119,26,0.4);
  color: var(--orange-light);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 4px 14px;
  border-radius: 20px;
  letter-spacing: 0.5px;
}

/* ---------- TOC Bar ---------- */
.guide-toc-bar {
  background: var(--navy-mid);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  position: sticky;
  top: 76px;
  z-index: 900;
}

.guide-toc {
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

.guide-toc::-webkit-scrollbar { display: none; }

.guide-toc li a {
  display: block;
  color: var(--gray);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 14px 16px;
  white-space: nowrap;
  transition: color var(--transition);
  letter-spacing: 0.3px;
}

.guide-toc li a:hover {
  color: var(--orange);
}

/* ---------- Guide Section Common ---------- */
.guide-section {
  scroll-margin-top: 130px;
}

.guide-section-num {
  font-family: 'Oswald', sans-serif;
  font-size: 5rem;
  font-weight: 700;
  color: rgba(232,119,26,0.15);
  line-height: 1;
  margin-bottom: -16px;
  letter-spacing: -2px;
}

.guide-section-num.light {
  color: rgba(255,255,255,0.08);
}

.guide-section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 900;
  color: var(--text);
  margin-bottom: 28px;
  letter-spacing: -0.3px;
}

.guide-section-title.light {
  color: var(--white);
}

.guide-lead {
  font-size: 1.05rem;
  line-height: 2;
  color: var(--text);
  margin-bottom: 40px;
}

/* ---------- 01 Principle ---------- */
.principle-intro {
  background: var(--gray-light);
  border-left: 4px solid var(--orange);
  padding: 28px 32px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-bottom: 48px;
}

.principle-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: start;
  gap: 12px;
  margin-bottom: 48px;
}

.pf-step {
  background: var(--white);
  border: 1px solid #e0e8f0;
  border-radius: var(--radius);
  padding: 24px 20px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.pf-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.pf-body h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 8px;
}

.pf-body p {
  font-size: 0.85rem;
  line-height: 1.7;
  color: #4a5568;
}

.pf-arrow {
  font-size: 1.5rem;
  color: var(--orange);
  align-self: center;
  font-weight: 700;
  flex-shrink: 0;
}

.principle-note {
  display: flex;
  gap: 20px;
  background: rgba(232,119,26,0.08);
  border: 1px solid rgba(232,119,26,0.25);
  border-radius: var(--radius);
  padding: 28px 32px;
}

.pnote-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.pnote-body h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 10px;
}

.pnote-body p {
  font-size: 0.92rem;
  line-height: 1.8;
  color: #4a5568;
}

/* ---------- 02 Defects ---------- */
.defects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.defect-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: transform var(--transition), border-color var(--transition);
}

.defect-card:hover {
  transform: translateY(-3px);
  border-color: rgba(232,119,26,0.4);
}

.defect-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.defect-num {
  font-family: 'Oswald', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--orange);
  line-height: 1;
}

.defect-severity {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 0.5px;
}

.defect-severity.high {
  background: rgba(220,38,38,0.25);
  color: #fca5a5;
  border: 1px solid rgba(220,38,38,0.4);
}

.defect-severity.mid {
  background: rgba(245,158,11,0.25);
  color: #fcd34d;
  border: 1px solid rgba(245,158,11,0.4);
}

.defect-severity.low {
  background: rgba(34,197,94,0.2);
  color: #86efac;
  border: 1px solid rgba(34,197,94,0.35);
}

.defect-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 14px;
}

.defect-thermo {
  margin-bottom: 14px;
}

.thermo-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(0,0,0,0.25);
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 0.78rem;
}

.thermo-label {
  color: var(--gray);
  white-space: nowrap;
}

.thermo-val {
  font-weight: 700;
  font-size: 0.8rem;
}

.thermo-val.hot { color: #f87171; }
.thermo-val.cold { color: #93c5fd; }
.thermo-val.both { color: #c4b5fd; }

.defect-card p {
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--text-light);
  margin-bottom: 16px;
}

.defect-risk {
  font-size: 0.78rem;
  color: #fca5a5;
  background: rgba(220,38,38,0.12);
  border-radius: 6px;
  padding: 8px 12px;
  border-left: 3px solid #f87171;
}

.defect-summary {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
}

.defect-summary h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
}

.defect-summary p {
  font-size: 0.9rem;
  line-height: 1.9;
  color: var(--text-light);
}

.limit-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 24px;
}

.limit-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px;
  padding: 24px;
}

.limit-card-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.limit-card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}

.limit-card p {
  font-size: 0.875rem;
  line-height: 1.9;
  color: var(--text-light);
  margin-bottom: 14px;
}

.limit-note {
  font-size: 0.8rem;
  color: #94a3b8;
  background: rgba(255,255,255,0.04);
  border-left: 3px solid #64748b;
  padding: 10px 14px;
  border-radius: 0 6px 6px 0;
  line-height: 1.8;
}

.limit-footer {
  margin-top: 20px;
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.9;
  padding-top: 16px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

@media (max-width: 768px) {
  .limit-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- ドローン限界セクション ---------- */
.drone-limit-section {
  margin-top: 40px;
}

.drone-limit-diagram {
  margin: 24px 0;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px;
  overflow: hidden;
}

.drone-limit-diagram-label {
  background: rgba(255,255,255,0.06);
  padding: 10px 16px;
  font-size: 0.8rem;
  color: #94a3b8;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  letter-spacing: 0.5px;
}

.drone-limit-diagram-body {
  padding: 16px;
  background: rgba(255,255,255,0.02);
}

.drone-limit-svg {
  width: 100%;
  max-width: 520px;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 6px;
}

/* ドローン限界は4列グリッド */
.drone-limit-section .limit-grid {
  grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 768px) {
  .drone-limit-section .limit-grid {
    grid-template-columns: 1fr;
  }
  .drone-limit-diagram-body {
    padding: 10px;
  }
}

/* ---------- 03 Legal ---------- */
.legal-main {
  margin-bottom: 40px;
}

.legal-law-box {
  background: var(--navy);
  border: 1px solid rgba(232,119,26,0.3);
  border-radius: var(--radius);
  padding: 32px 36px;
}

.legal-law-label {
  font-family: 'Oswald', sans-serif;
  color: var(--orange);
  font-size: 0.85rem;
  letter-spacing: 3px;
  margin-bottom: 16px;
}

.legal-quote {
  font-size: 0.95rem;
  line-height: 2;
  color: var(--text-light);
  border-left: 3px solid var(--orange);
  padding-left: 20px;
  font-style: italic;
}

.legal-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.legal-card {
  background: var(--white);
  border: 1px solid #e0e8f0;
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}

.legal-icon {
  font-size: 2rem;
  margin-bottom: 14px;
}

.legal-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--orange);
}

.legal-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.legal-list li {
  font-size: 0.85rem;
  line-height: 1.6;
  color: #4a5568;
  padding-left: 14px;
  position: relative;
}

.legal-list li::before {
  content: '・';
  position: absolute;
  left: 0;
  color: var(--orange);
}

.legal-note {
  display: flex;
  gap: 20px;
  background: rgba(245,158,11,0.08);
  border: 1px solid rgba(245,158,11,0.3);
  border-radius: var(--radius);
  padding: 28px 32px;
}

.lnote-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
}

.lnote-body h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 10px;
}

.lnote-body p {
  font-size: 0.9rem;
  line-height: 1.85;
  color: #4a5568;
}

/* ---------- 04 Comparison ---------- */
.compare-detail {
  margin-bottom: 40px;
  overflow-x: auto;
}

.compare-table-lg {
  width: 100%;
  min-width: 640px;
}

.compare-table-lg th .th-sub {
  display: block;
  font-size: 0.72rem;
  font-weight: 400;
  opacity: 0.7;
  margin-top: 4px;
}

.compare-note {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 36px;
}

.compare-note h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
}

.compare-note > p {
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--text-light);
  margin-bottom: 16px;
}

.compare-note-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.compare-note-list li {
  font-size: 0.875rem;
  color: var(--text-light);
  padding-left: 18px;
  position: relative;
  line-height: 1.7;
}

.compare-note-list li::before {
  content: '▷';
  position: absolute;
  left: 0;
  color: var(--orange);
  font-size: 0.75rem;
  top: 3px;
}

/* ---------- 05 Conditions ---------- */
.conditions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.cond-card {
  background: var(--white);
  border: 1px solid #e0e8f0;
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}

.cond-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.cond-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--orange);
}

.cond-good, .cond-bad {
  margin-bottom: 14px;
}

.cond-label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 4px;
  margin-bottom: 8px;
  letter-spacing: 1px;
}

.cond-label.good {
  background: rgba(34,197,94,0.15);
  color: #16a34a;
  border: 1px solid rgba(34,197,94,0.3);
}

.cond-label.bad {
  background: rgba(220,38,38,0.1);
  color: #dc2626;
  border: 1px solid rgba(220,38,38,0.25);
}

.cond-good p, .cond-bad p {
  font-size: 0.85rem;
  line-height: 1.7;
  color: #4a5568;
}

.conditions-flow {
  background: var(--navy);
  border-radius: var(--radius);
  padding: 36px 40px;
}

.conditions-flow h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 28px;
}

.cflow-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.cflow-list li {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.cflow-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--orange);
  color: var(--white);
  font-family: 'Oswald', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 2px;
}

.cflow-list li > div strong {
  display: block;
  font-size: 0.95rem;
  color: var(--white);
  margin-bottom: 4px;
}

.cflow-list li > div p {
  font-size: 0.85rem;
  color: var(--gray);
  line-height: 1.65;
}

/* ---------- 06 Report ---------- */
.report-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.report-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
}

.report-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.report-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--orange);
}

.report-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.report-list li {
  font-size: 0.85rem;
  color: var(--text-light);
  padding-left: 16px;
  position: relative;
  line-height: 1.6;
}

.report-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--orange);
  font-size: 0.8rem;
}

.report-note {
  display: flex;
  gap: 20px;
  background: rgba(232,119,26,0.1);
  border: 1px solid rgba(232,119,26,0.3);
  border-radius: var(--radius);
  padding: 28px 32px;
}

.rnote-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.rnote-body h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}

.rnote-body p {
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--text-light);
}

/* ---------- 07 FAQ ---------- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 840px;
  margin: 0 auto;
}

.faq-item {
  background: var(--white);
  border: 1px solid #e0e8f0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 28px;
  text-align: left;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--navy);
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--transition);
  font-family: 'Noto Sans JP', sans-serif;
}

.faq-q:hover {
  color: var(--orange);
}

.faq-arrow {
  font-size: 0.75rem;
  color: var(--orange);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.faq-q[aria-expanded="true"] .faq-arrow {
  transform: rotate(180deg);
}

.faq-a {
  display: none;
  padding: 0 28px 24px;
}

.faq-a.open {
  display: block;
}

.faq-a p {
  font-size: 0.9rem;
  line-height: 1.9;
  color: #4a5568;
  border-top: 1px solid #e0e8f0;
  padding-top: 18px;
}

/* ---------- CTA Section ---------- */
.guide-cta {
  background: var(--navy);
  padding: 100px 0;
}

.guide-cta-inner {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
  padding: 0 24px;
}

.guide-cta-inner h2 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 900;
  color: var(--white);
  margin-bottom: 16px;
}

.guide-cta-inner p {
  font-size: 1rem;
  color: var(--text-light);
  line-height: 1.85;
  margin-bottom: 36px;
}

.guide-cta-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.btn-outline-dark {
  display: inline-block;
  border: 2px solid rgba(255,255,255,0.3);
  color: var(--white);
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: border-color var(--transition), background var(--transition);
}

.btn-outline-dark:hover {
  border-color: var(--white);
  background: rgba(255,255,255,0.08);
}

.guide-cta-cert {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--gray);
  font-size: 0.8rem;
}

.guide-cta-ters {
  height: 36px;
  width: auto;
  display: inline-block;
  opacity: 0.7;
}

/* ---------- Reveal Animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .principle-flow {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .pf-arrow {
    transform: rotate(90deg);
    text-align: center;
  }
  .legal-grid {
    grid-template-columns: 1fr;
  }
  .defects-grid {
    grid-template-columns: 1fr;
  }
  .conditions-grid {
    grid-template-columns: 1fr;
  }
  .report-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .guide-hero-content {
    padding: 48px 20px;
  }
  .guide-toc-bar {
    top: 56px;
  }
  .guide-toc li a {
    padding: 12px 12px;
    font-size: 0.72rem;
  }
  .principle-note {
    flex-direction: column;
    gap: 12px;
  }
  .legal-note, .report-note {
    flex-direction: column;
    gap: 12px;
  }
  .conditions-flow {
    padding: 28px 24px;
  }
  .compare-note {
    padding: 24px;
  }
  .legal-law-box {
    padding: 24px;
  }
  .faq-q {
    padding: 18px 20px;
    font-size: 0.875rem;
  }
  .faq-a {
    padding: 0 20px 20px;
  }
  .guide-cta {
    padding: 72px 0;
  }
}

@media (max-width: 480px) {
  .guide-section-num {
    font-size: 3.5rem;
  }
  .principle-intro {
    padding: 20px;
  }
}