/* Executive letter — dedicated layout (not shared with other pages) */

.exec-letter {
  background: var(--bg);
}

/* ---------- Black chapter mast ---------- */

.letter-chapter {
  padding-top: var(--nav-height, 64px);
  background: #000;
  border-bottom: 1px solid var(--border-strong);
}

.letter-chapter__inner {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: clamp(420px, 58vh, 560px);
  padding-block: clamp(48px, 7vw, 88px);
}

.letter-chapter__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3) var(--s-5);
  margin-bottom: clamp(var(--s-6), 6vw, var(--s-8));
}

.letter-chapter__back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--t-small);
  color: var(--text-secondary);
  transition: color var(--d-fast) var(--ease-out);
}

.letter-chapter__back .icon {
  width: 14px;
  height: 14px;
  transform: rotate(180deg);
}

.letter-chapter__back:hover {
  color: var(--text);
}

.letter-chapter__stamp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
}

.letter-chapter__title {
  margin: 0;
  max-width: 18ch;
  font-size: clamp(2.5rem, 1.5rem + 3.2vw, 4.25rem);
  line-height: 1.04;
  letter-spacing: -0.025em;
  color: var(--text);
  text-wrap: balance;
}

.letter-chapter__deck {
  margin: clamp(var(--s-4), 2.5vw, var(--s-5)) 0 0;
  max-width: 46ch;
  font-family: var(--font-serif);
  font-size: clamp(1.0625rem, 0.95rem + 0.45vw, 1.3125rem);
  line-height: 1.5;
  color: var(--text-secondary);
  text-wrap: balance;
}

/* ---------- Letter body grid ---------- */

.letter-core {
  padding-block: clamp(56px, 8vw, 96px) clamp(48px, 6vw, 64px);
}

.letter-core__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(40px, 5vw, 56px);
  align-items: start;
}

/* Section index — engineered mono rail */

.letter-nav {
  display: grid;
  gap: var(--s-4);
}

.letter-nav__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.letter-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border);
}

.letter-nav__list a {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  gap: var(--s-3);
  align-items: baseline;
  padding-block: 0.85rem;
  border-bottom: 1px solid var(--border);
  font-size: var(--t-small);
  line-height: 1.35;
  color: var(--text-secondary);
  transition: color var(--d-fast) var(--ease-out);
}

.letter-nav__list a:hover {
  color: var(--text);
}

.letter-nav__num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--primary);
  letter-spacing: 0.04em;
}

/* Letter writing column — open editorial, not a boxed panel */

.letter-write {
  min-width: 0;
  padding-top: clamp(4px, 0.6vw, 8px);
}

.letter-prose {
  max-width: 38rem;
}

.letter-prose__to {
  margin: 0 0 clamp(var(--s-6), 5vw, var(--s-7));
  padding-bottom: clamp(var(--s-5), 4vw, var(--s-6));
  border-bottom: 1px solid var(--border);
  font-family: var(--font-serif);
  font-size: clamp(1.3125rem, 1.15rem + 0.55vw, 1.625rem);
  font-style: italic;
  line-height: 1.4;
  color: var(--text);
}

.letter-passage {
  margin-top: clamp(var(--s-6), 5vw, var(--s-8));
}

.letter-passage:first-of-type {
  margin-top: 0;
}

.letter-passage [id],
.letter-passage {
  scroll-margin-top: calc(var(--nav-height, 64px) + var(--s-5));
}

.letter-prose p {
  margin: 0 0 1.65em;
  font-family: var(--font-serif);
  font-size: clamp(1.0625rem, 1rem + 0.28vw, 1.1875rem);
  line-height: 1.78;
  color: var(--text);
  text-wrap: pretty;
  hanging-punctuation: first allow-end;
}

.letter-prose p:last-child {
  margin-bottom: 0;
}

.letter-prose__pull {
  margin: clamp(var(--s-5), 4vw, var(--s-6)) 0 0;
  padding: 0 0 0 clamp(var(--s-4), 3vw, var(--s-5));
  border: 0;
  border-left: 2px solid var(--primary);
  font-family: var(--font-serif);
  font-size: clamp(1.1875rem, 1.05rem + 0.5vw, 1.4375rem);
  font-style: italic;
  line-height: 1.55;
  letter-spacing: -0.008em;
  color: color-mix(in srgb, var(--text) 92%, var(--primary));
  text-wrap: balance;
}

.letter-prose__sign {
  margin-top: clamp(var(--s-8), 7vw, 5.5rem);
  margin-inline: auto;
  max-width: max-content;
  text-align: center;
}

.letter-prose__sign::before {
  content: '';
  display: block;
  width: 2.75rem;
  height: 1px;
  margin-inline: auto;
  margin-bottom: var(--s-4);
  background: color-mix(in srgb, var(--primary) 70%, transparent);
}

.letter-prose__sign-name {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.0625rem, 1rem + 0.28vw, 1.25rem);
  font-style: italic;
  line-height: 1.35;
  color: var(--text);
}

.letter-prose__sign-role {
  margin: 0.45em 0 0;
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  font-style: normal;
  letter-spacing: 0.01em;
  color: var(--text-secondary);
}

.letter-afterword {
  margin: clamp(var(--s-6), 5vw, var(--s-7)) 0 0;
  font-family: var(--font-serif);
  font-size: clamp(0.8125rem, 0.78rem + 0.35vw, 0.9375rem);
  font-style: italic;
  line-height: 1.55;
  color: var(--text-tertiary);
  text-align: center;
  white-space: nowrap;
}

.letter-afterword a {
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--primary) 35%, transparent);
  transition:
    color var(--d-fast) var(--ease-out),
    border-color var(--d-fast) var(--ease-out);
}

.letter-afterword a:hover {
  color: var(--text);
  border-bottom-color: var(--primary);
}

@media (min-width: 900px) {
  .letter-prose {
    max-width: 42rem;
  }

  .letter-passage + .letter-passage {
    margin-top: clamp(var(--s-7), 5.5vw, 3.25rem);
  }
}

/* Compact site footer — sitemap + bar, no full-viewport mast */

.exec-letter .footer--compact {
  min-height: 0;
}

.exec-letter .footer--compact .footer__inner {
  min-height: 0;
  padding-top: clamp(var(--s-7), 6vw, var(--s-8));
}

.exec-letter .footer--compact .footer__sitemap {
  margin-top: 0;
}

.exec-letter .footer--compact .footer__domain {
  color: var(--text-secondary);
  transition: color var(--d-fast) var(--ease-out);
}

.exec-letter .footer--compact .footer__domain:hover {
  color: var(--text);
}

/* ---------- Desktop composition ---------- */

@media (min-width: 900px) {
  .letter-core__grid {
    grid-template-columns: minmax(10.5rem, 12.5rem) minmax(0, 1fr);
    column-gap: clamp(48px, 6vw, 80px);
  }

  .letter-nav {
    position: sticky;
    top: calc(var(--nav-height, 64px) + var(--s-5));
  }
}

@media (max-width: 899px) {
  .letter-nav__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-top: 0;
    gap: var(--s-2);
  }

  .letter-nav__list li {
    border: 1px solid var(--border);
    background: var(--surface);
  }

  .letter-nav__list a {
    grid-template-columns: 2rem minmax(0, 1fr);
    padding: 0.75rem 0.85rem;
    border-bottom: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .letter-chapter__back,
  .letter-nav__list a {
    transition: none;
  }
}