/* ═══════════════════════════════════════
   I. 入口 Opening
   ═══════════════════════════════════════ */
.opening {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--header-h) + 3rem) var(--gutter) 5rem;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 90% 70% at 20% 0%, rgba(30, 58, 95, 0.04) 0%, transparent 55%),
    var(--color-bg);
}

.opening__inner {
  max-width: var(--max-width-wide);
  margin-inline: auto;
  width: 100%;
}

.opening__title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 600;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tighter);
  max-width: 11ch;
}

.opening__title em {
  font-style: normal;
  color: var(--color-accent);
}

.opening__scroll {
  position: absolute;
  bottom: 2.5rem;
  left: var(--gutter);
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.opening__scroll-line {
  width: 48px;
  height: 1px;
  background: var(--color-border);
  position: relative;
  overflow: hidden;
}

.opening__scroll-line::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--color-text-muted);
  transform: translateX(-100%);
  animation: scroll-hint 2.4s var(--ease-in-out) infinite;
}

@keyframes scroll-hint {
  0%, 100% { transform: translateX(-100%); }
  50% { transform: translateX(0); }
}

@media (prefers-reduced-motion: reduce) {
  .opening__scroll-line::after { animation: none; transform: none; }
}

/* ═══════════════════════════════════════
   II. ずれ Shift
   ═══════════════════════════════════════ */
.shift__grid {
  display: grid;
  gap: clamp(3rem, 8vw, 6rem);
  margin-top: clamp(3rem, 8vw, 5rem);
}

@media (min-width: 768px) {
  .shift__grid {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
}

.shift__chain {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.shift__chain-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-snug);
  color: var(--color-text-secondary);
  transition: color var(--duration-normal);
}

.shift__chain-item:first-child {
  border-top: 1px solid var(--color-border);
  color: var(--color-text);
}

.shift__chain-item.is-emphasis {
  color: var(--color-text);
  font-weight: 600;
}

.shift__chain-arrow {
  display: none;
}

.shift__aside {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
  max-width: 28em;
}

.shift__mirror {
  margin-top: clamp(2.5rem, 6vw, 4rem);
  max-width: 22em;
}

.shift__mirror p {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  line-height: var(--leading-relaxed);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
  font-weight: 500;
}

.shift__mirror-gap {
  margin-top: 1.75rem;
  color: var(--color-text-secondary);
}

/* ═══════════════════════════════════════
   III. 転換 Turn
   ═══════════════════════════════════════ */
.turn {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
}

.turn__peak {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 3rem) var(--gutter) clamp(5rem, 12vh, 8rem);
}

.turn__scroll {
  position: absolute;
  bottom: 2.5rem;
  left: var(--gutter);
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text-on-dark-muted);
}

.turn__scroll-line {
  width: 48px;
  height: 1px;
  background: var(--color-border-dark);
  position: relative;
  overflow: hidden;
}

.turn__scroll-line::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--color-text-on-dark-muted);
  transform: translateX(-100%);
  animation: scroll-hint 2.4s var(--ease-in-out) infinite;
}

@media (prefers-reduced-motion: reduce) {
  .turn__scroll-line::after { animation: none; transform: none; }
}

.turn__peak-inner {
  width: 100%;
  max-width: var(--max-width-wide);
  margin-inline: auto;
}

.turn__principle-en {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 4.25rem);
  font-weight: 600;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tighter);
  color: var(--color-text-on-dark);
  margin-top: 2.5rem;
  max-width: 14ch;
}

.turn__principle-ja {
  font-size: clamp(1.125rem, 2.8vw, 1.625rem);
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-snug);
  color: var(--color-text-on-dark-muted);
  margin-top: clamp(1.25rem, 3vw, 2rem);
  max-width: 16em;
}

.turn__supplement {
  padding-block: var(--section-y-lg);
  border-top: 1px solid var(--color-border-dark);
}

.turn__supplement-label {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-on-dark-muted);
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
}

.turn__pillars {
  display: grid;
  gap: clamp(2.5rem, 6vw, 4rem);
}

@media (min-width: 768px) {
  .turn__pillars {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }
}

.turn__pillar-en {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-on-dark-muted);
  margin-bottom: 1rem;
}

.turn__pillar-title {
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-snug);
  margin-bottom: 1rem;
  color: var(--color-text-on-dark);
}

.turn__pillar-body {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: var(--color-text-on-dark-muted);
}

/* ═══════════════════════════════════════
   IV. 構造 Structure
   ═══════════════════════════════════════ */
.structure__flow {
  margin-top: clamp(3rem, 8vw, 5rem);
  max-width: 36em;
}

.structure__flow p {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

.structure__flow p + p {
  margin-top: 1.75rem;
}

.structure__category {
  margin-top: clamp(4rem, 10vw, 7rem);
  padding-top: clamp(4rem, 10vw, 7rem);
  border-top: 1px solid var(--color-border);
  max-width: 36em;
}

.structure__category-lead {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

.structure__category-naming {
  margin-top: clamp(2rem, 5vw, 3rem);
  font-family: var(--font-display);
  font-size: var(--text-statement);
  font-weight: 500;
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-secondary);
}

.structure__category-naming strong {
  font-weight: 600;
  color: var(--color-text);
}

.structure__reveal {
  margin-top: clamp(4rem, 10vw, 7rem);
  padding-top: clamp(4rem, 10vw, 7rem);
  border-top: 1px solid var(--color-border);
}

.structure__product-name {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 600;
  letter-spacing: var(--tracking-tighter);
  line-height: 1;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
}

.structure__product-desc {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
  max-width: 32em;
}

/* ═══════════════════════════════════════
   V. 痕跡 Trace
   ═══════════════════════════════════════ */
.trace__lead {
  margin-top: 2rem;
  max-width: 32em;
}

.trace__gallery {
  display: flex;
  flex-direction: column;
  gap: clamp(4rem, 10vw, 6rem);
  margin-top: clamp(4rem, 10vw, 6rem);
}

.trace__item {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.25rem);
  align-items: center;
}

@media (min-width: 900px) {
  .trace__item {
    grid-template-columns: minmax(0, 17rem) minmax(0, 1fr);
    gap: clamp(2.5rem, 6vw, 4.5rem);
  }

  .trace__item:nth-child(even) {
    direction: rtl;
  }

  .trace__item:nth-child(even) > * {
    direction: ltr;
  }
}

/* 思想を主役・画面を証拠 — フレームを大きく、画像は contain で全体を見せる */
.trace__item .img-evidence {
  padding: clamp(1rem, 2.8vw, 1.75rem);
  min-height: clamp(18rem, 38vw, 28rem);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, #f4f6f9 0%, #eef1f5 100%);
}

.trace__item .img-evidence img {
  width: 100%;
  height: auto;
  max-height: clamp(16rem, 34vw, 26rem);
  aspect-ratio: unset;
  object-fit: contain;
  object-position: center center;
}

/* FIELD — 第7条一覧 → 予告入力 → 登録の流れを一画面で */
.trace__item:nth-child(1) .img-evidence {
  padding: clamp(0.55rem, 1.5vw, 0.95rem);
  min-height: clamp(19rem, 40vw, 30rem);
}

.trace__item:nth-child(1) .img-evidence img {
  max-height: clamp(18.5rem, 38vw, 29rem);
}

/* PRIORITY — 優先順位リスト（410C / 520A / 630B）を主役に */
.trace__item:nth-child(2) .img-evidence {
  padding: clamp(0.55rem, 1.5vw, 0.95rem);
}

.trace__item:nth-child(2) .img-evidence img {
  width: 104%;
  max-width: 104%;
  margin-left: -2%;
  max-height: clamp(17.5rem, 37vw, 28rem);
}

/* OBSERVE — 管理ダッシュボード全体（通知→KPI→テーブル）を contain で見せる */
.trace__item:nth-child(3) .img-evidence {
  padding: clamp(0.65rem, 1.8vw, 1.15rem);
  min-height: 0;
  align-items: flex-start;
}

.trace__item:nth-child(3) .img-evidence img {
  width: 100%;
  max-width: 100%;
  margin-left: 0;
  max-height: clamp(17rem, 36vw, 27rem);
  object-position: center top;
}

.trace__caption-label {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.trace__caption-title {
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-snug);
  margin-bottom: 1rem;
}

.trace__caption-body {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
  max-width: 26em;
}

/* ═══════════════════════════════════════
   余韻 Origin
   ═══════════════════════════════════════ */
.origin__grid {
  display: grid;
  gap: clamp(3rem, 8vw, 5rem);
  margin-top: clamp(3rem, 8vw, 5rem);
}

@media (min-width: 768px) {
  .origin__grid {
    grid-template-columns: 1fr 1fr;
    align-items: end;
  }
}

.origin__name-ja {
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-on-dark);
}

.origin__name-en {
  font-size: var(--text-sm);
  color: var(--color-text-on-dark-muted);
  margin-top: 0.35rem;
}

.origin__acronym {
  display: flex;
  gap: 2.5rem;
  margin-top: 2.5rem;
}

.origin__acronym-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.origin__acronym-letter {
  font-size: var(--text-3xl);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: 1;
  color: var(--color-text-on-dark);
}

.origin__acronym-word {
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text-on-dark-muted);
}

.origin__closing {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-text-on-dark-muted);
}

.origin__closing p + p {
  margin-top: 1.5rem;
}

.origin__contact {
  display: inline-block;
  margin-top: 3rem;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-on-dark);
  border-bottom: 1px solid rgba(255, 255, 255, 0.25);
  padding-bottom: 0.2rem;
  transition: border-color var(--duration-fast), opacity var(--duration-fast);
}

.origin__contact:hover {
  border-color: rgba(255, 255, 255, 0.6);
  opacity: 0.85;
}