/* ===== KUUTA — Lighting Page Styles ===== */

/* Light Hero (full-width with background image) */
.light-hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.light-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.light-hero-bg img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: brightness(.35);
}
.light-hero-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 160px var(--gap) 80px;
  max-width: 900px;
}
.light-hero-title {
  font-family: var(--serif);
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 600;
  letter-spacing: .08em;
  line-height: 1.3;
  color: #fff;
  margin-bottom: 24px;
}
.light-hero .hero-sub {
  color: rgba(255,255,255,.6);
}
.light-hero-lead {
  font-size: clamp(14px, 1.4vw, 17px);
  color: rgba(255,255,255,.7);
  line-height: 2;
}
.light-hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,.15);
}
.light-hero-stat {
  text-align: center;
}
.light-hero-stat-num {
  display: block;
  font-family: var(--serif);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 300;
  color: #fff;
  letter-spacing: .05em;
  line-height: 1.2;
}
.light-hero-stat-num small {
  font-size: .5em;
}
.light-hero-stat-label {
  display: block;
  font-size: 12px;
  color: rgba(255,255,255,.5);
  letter-spacing: .08em;
  margin-top: 6px;
}

/* Split heading */
.page-split-heading {
  font-family: var(--serif);
  font-size: clamp(20px, 2.5vw, 28px);
  font-weight: 400;
  letter-spacing: .06em;
  margin-bottom: 20px;
}

/* Tech Cards */
.tech-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.tech-card {
  background: var(--bg-card);
  border-radius: 8px;
  padding: 40px 32px;
  box-shadow: 0 2px 20px rgba(0,0,0,.04);
  border: 1px solid rgba(0,0,0,.04);
}
.tech-card-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 20px;
  color: var(--accent);
}
.tech-card-icon svg {
  width: 100%; height: 100%;
}
.tech-card h3 {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 400;
  letter-spacing: .06em;
  margin-bottom: 8px;
}
.tech-card-temp {
  font-size: 13px;
  color: var(--accent);
  letter-spacing: .08em;
  margin-bottom: 16px !important;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(0,0,0,.06);
}
.tech-card-features {
  list-style: none;
  padding: 0;
  margin-top: 16px;
}
.tech-card-features li {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.8;
  padding-left: 18px;
  position: relative;
}
.tech-card-features li::before {
  content: '';
  position: absolute;
  left: 0; top: 10px;
  width: 8px; height: 1px;
  background: var(--accent);
}

/* Layer Grid */
.layer-grid {
  max-width: 700px;
  margin: 0 auto;
}
.layer-item {
  display: flex;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid rgba(0,0,0,.06);
}
.layer-item:last-child { border-bottom: none; }
.layer-num {
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 300;
  color: var(--accent);
  opacity: .6;
  min-width: 48px;
  line-height: 1;
  padding-top: 4px;
}
.layer-content h3 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .04em;
  margin-bottom: 6px;
}
.layer-content p {
  font-size: 14px !important;
  margin-bottom: 0 !important;
}

/* Light Gallery (1 big + 2 small) */
.light-gallery {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 24px;
}
.light-gallery-main {
  border-radius: 6px;
  overflow: hidden;
}
.light-gallery-main img {
  width: 100%; height: 100%;
  object-fit: cover;
  aspect-ratio: 3/2;
}
.light-gallery-main p {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 10px;
}
.light-gallery-side {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.light-gallery-item {
  border-radius: 6px;
  overflow: hidden;
  flex: 1;
}
.light-gallery-item img {
  width: 100%; height: 100%;
  object-fit: cover;
  aspect-ratio: 4/3;
}
.light-gallery-item p {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 8px;
}

/* Process Timeline */
.process-timeline {
  max-width: 1000px;
  margin: 0 auto;
}
.process-step {
  display: grid;
  grid-template-columns: 56px 1fr 1fr;
  gap: 32px;
  align-items: center;
  padding: 40px 0;
  border-bottom: 1px solid rgba(0,0,0,.06);
}
.process-step:last-child { border-bottom: none; }
.process-step--reverse { direction: ltr; }
.process-step--reverse .process-step-img { order: 3; }
.process-step--reverse .process-step-text { order: 2; }
.process-step-num {
  font-family: var(--serif);
  font-size: 40px;
  font-weight: 300;
  color: var(--accent);
  opacity: .4;
  text-align: center;
}
.process-step-img {
  border-radius: 6px;
  overflow: hidden;
  aspect-ratio: 4/3;
}
.process-step-img img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.process-step-text h3 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .04em;
  margin-bottom: 12px;
}

/* Spec Table */
.spec-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 700px;
}
.spec-table th,
.spec-table td {
  padding: 14px 16px;
  text-align: center;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.spec-table th {
  font-size: 13px;
  font-weight: 700;
  color: rgba(255,255,255,.7);
  letter-spacing: .04em;
  white-space: nowrap;
}
.spec-table td:first-child {
  text-align: left;
  font-weight: 700;
  color: rgba(255,255,255,.6);
  white-space: nowrap;
}
.spec-table td {
  color: rgba(255,255,255,.8);
}
.spec-highlight {
  color: var(--accent) !important;
  font-weight: 700 !important;
}
.spec-ok { color: #6dba6d !important; }
.spec-caution { color: #d4a845 !important; }
.spec-ng { color: rgba(255,255,255,.25) !important; }
.spec-dim { color: rgba(255,255,255,.3) !important; }
.spec-table thead th:first-child { text-align: left; }
.spec-table thead th:last-child { color: rgba(255,255,255,.3); }

/* Fiber Diagram */
.fiber-explain {
  display: grid;
  gap: 48px;
}
.fiber-diagram {
  background: var(--bg-warm);
  border-radius: 8px;
  padding: 40px 32px;
}
.fiber-step {
  display: flex;
  align-items: stretch;
  gap: 0;
}
.fiber-step-box {
  flex: 1;
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: relative;
}
.fiber-step-box--outside {
  background: rgba(0,0,0,.03);
  border-radius: 8px 0 0 8px;
}
.fiber-step-box--inside {
  background: rgba(184,92,56,.06);
  border-radius: 0 8px 8px 0;
}
.fiber-step-label {
  position: absolute;
  top: 8px; left: 16px;
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--text-muted);
  text-transform: uppercase;
}
.fiber-wall {
  display: flex;
  align-items: center;
  justify-content: center;
  writing-mode: vertical-rl;
  background: var(--text);
  color: #fff;
  font-size: 11px;
  letter-spacing: .15em;
  padding: 12px 8px;
  min-width: 32px;
}
.fiber-step-item {
  text-align: center;
  flex: 1;
}
.fiber-step-item strong {
  display: block;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 4px;
}
.fiber-step-item small {
  font-size: 11px;
  color: var(--text-muted);
}
.fiber-step-item--fiber strong {
  color: var(--accent);
}
.fiber-arrow {
  display: flex;
  align-items: center;
  font-size: 18px;
  color: var(--text-muted);
  padding: 0 4px;
}

.fiber-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.fiber-feature h3 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .04em;
  margin-bottom: 10px;
}

/* Color explain */
.color-explain-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.color-explain-item h3 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .04em;
  margin-bottom: 8px;
}

/* Danger comparison grid */
.danger-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.danger-item {
  padding: 36px 32px;
  border-radius: 8px;
  background: rgba(0,0,0,.02);
  border: 1px solid rgba(0,0,0,.06);
}
.danger-item--ok {
  background: rgba(184,92,56,.03);
  border-color: rgba(184,92,56,.15);
}
.danger-icon {
  font-size: 32px;
  margin-bottom: 12px;
}
.danger-icon--ng { color: #c44; }
.danger-icon--ok { color: var(--accent); }
.danger-item h3 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .04em;
  margin-bottom: 16px;
}
.danger-item ul {
  list-style: none;
  padding: 0;
}
.danger-item ul li {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  padding-left: 20px;
  position: relative;
}
.danger-item ul li::before {
  content: '';
  position: absolute;
  left: 0; top: 10px;
  width: 8px; height: 1px;
  background: currentColor;
}
.danger-item--ok ul li::before {
  background: var(--accent);
}

/* FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.faq-item {
  border-bottom: 1px solid rgba(0,0,0,.06);
}
.faq-item summary {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .03em;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 12px;
}
.faq-item summary::before {
  content: '+';
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 300;
  color: var(--accent);
  min-width: 20px;
  text-align: center;
  transition: transform .3s var(--ease);
}
.faq-item[open] summary::before {
  content: '−';
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 2;
  padding: 0 0 24px 32px;
}

/* Responsive */
@media (max-width: 900px) {
  .light-hero { min-height: 70vh; }
  .light-hero-stats { gap: 24px; flex-wrap: wrap; }
  .tech-cards { grid-template-columns: 1fr; max-width: 480px; margin-left: auto; margin-right: auto; }
  .fiber-step { flex-direction: column; }
  .fiber-wall { writing-mode: horizontal-tb; min-width: auto; padding: 8px 16px; }
  .fiber-features { grid-template-columns: 1fr; }
  .color-explain-grid { grid-template-columns: 1fr; }
  .danger-grid { grid-template-columns: 1fr; }
  .light-gallery { grid-template-columns: 1fr; }
  .process-step,
  .process-step--reverse {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .process-step-num { text-align: left; }
  .process-step--reverse .process-step-img,
  .process-step--reverse .process-step-text { order: unset; }
}
@media (max-width: 768px) {
  .light-hero-stats { gap: 16px; }
  .light-hero-stat-num { font-size: 28px; }
}