/* ════════════════════════════════════════════════
   KEEL — SHARED LETTER + NAV STYLES
   Mobile-first. Used by all audience letter pages.
════════════════════════════════════════════════ */

:root {
  --color-bg:           #FAFAF7;
  --color-bg-raised:    #FFFFFF;
  --color-bg-sunken:    #F1ECE2;
  --color-surface:      #F5EFE3;

  --color-text-primary: #0B2A3F;
  --color-text-body:    #2A3F52;
  --color-text-muted:   #6B7E90;
  --color-text-inverse: #FFF4E6;

  --color-accent:       #E8A85C;
  --color-accent-hover: #D4914A;

  --color-border:        rgba(11,42,63,0.18);
  --color-border-subtle: rgba(11,42,63,0.10);

  --font-display: 'Fraunces', Georgia, serif;
  --font-body:    'Inter', -apple-system, system-ui, sans-serif;

  --tracking-eyebrow: 0.18em;
  --tracking-cta:     0.10em;

  --radius-sm: 6px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --transition-base: 0.3s ease;

  /* mobile-first page gutter */
  --page-gutter: 22px;
}

@media (min-width: 720px) {
  :root { --page-gutter: 48px; }
}
@media (min-width: 1100px) {
  :root { --page-gutter: 88px; }
}

* , *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--color-bg);
  color: var(--color-text-body);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }


/* ════════════════════════════════════════════════
   NAV — mobile first w/ hamburger
════════════════════════════════════════════════ */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px var(--page-gutter);
  background: rgba(250, 250, 247, 0.92);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--color-border-subtle);
}

.nav-wordmark-group { display: flex; align-items: center; gap: 10px; }
.keel-mark-svg .keel-ring { stroke: var(--color-text-primary); }
.keel-mark-svg .keel-dot  { fill:   var(--color-accent); }
.nav-wordmark {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--color-text-primary);
}

.nav-links { display: none; }
.nav-cta {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--color-text-body);
  padding: 8px 0;
  cursor: pointer;
  background: none;
  border: 0;
  font-family: var(--font-body);
}
.nav-cta:hover { color: var(--color-text-primary); }

.nav-trial {
  background: var(--color-accent);
  color: var(--color-text-primary);
  border: 0;
  border-radius: 999px;
  padding: 9px 18px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--font-body);
  cursor: pointer;
  box-shadow: 0 6px 18px -8px rgba(232,168,92,0.5);
}
.nav-trial:hover { background: var(--color-accent-hover); }

/* hamburger */
.nav-burger {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  background: none; border: 0; cursor: pointer;
  margin-right: -8px;
}
.nav-burger span {
  position: relative;
  display: block;
  width: 22px; height: 1.5px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), top var(--transition-base), opacity var(--transition-base);
}
.nav-burger span::before,
.nav-burger span::after {
  content: '';
  position: absolute;
  left: 0;
  width: 22px; height: 1.5px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), top var(--transition-base);
}
.nav-burger span::before { top: -7px; }
.nav-burger span::after  { top:  7px; }
.nav-burger.open span { background: transparent; }
.nav-burger.open span::before { top: 0; transform: rotate(45deg); }
.nav-burger.open span::after  { top: 0; transform: rotate(-45deg); }

/* mobile sheet */
.nav-sheet {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 99;
  background: var(--color-bg);
  padding: 88px var(--page-gutter) 32px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.nav-sheet.open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.nav-sheet-section {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--color-accent);
  padding: 18px 0 10px;
  border-top: 1px solid var(--color-border-subtle);
}
.nav-sheet-section:first-child { border-top: 0; padding-top: 4px; }
.nav-sheet a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 14px 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 400;
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-border-subtle);
}
.nav-sheet a em {
  font-style: normal;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-muted);
}
.nav-sheet-cta {
  margin-top: 32px;
  display: inline-block;
  align-self: flex-start;
  background: var(--color-accent);
  color: var(--color-text-primary) !important;
  border-radius: 999px;
  padding: 14px 28px !important;
  font-family: var(--font-body) !important;
  font-size: 13px !important;
  font-weight: 600 !important;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-bottom: 0 !important;
}

/* desktop */
@media (min-width: 880px) {
  .nav-burger { display: none; }
  .nav-sheet  { display: none !important; }
  .nav-links {
    display: flex;
    align-items: center;
    gap: 36px;
  }
  .nav-dropdown { position: relative; }
  .nav-dropdown-trigger {
    display: inline-flex;
    align-items: center;
    gap: 6px;
  }
  .nav-dropdown-trigger::after {
    content: '';
    width: 6px; height: 6px;
    border-right: 1.4px solid currentColor;
    border-bottom: 1.4px solid currentColor;
    transform: rotate(45deg);
    margin-top: -3px;
    margin-left: 2px;
    opacity: 0.6;
  }
  .nav-dropdown-menu {
    position: absolute;
    top: 100%; left: 50%;
    transform: translate(-50%, 8px);
    min-width: 220px;
    background: var(--color-bg-raised);
    border: 1px solid var(--color-border-subtle);
    border-radius: 14px;
    padding: 10px;
    box-shadow: 0 24px 48px -16px rgba(11,42,63,0.18);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }
  .nav-dropdown:hover .nav-dropdown-menu,
  .nav-dropdown:focus-within .nav-dropdown-menu {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, 0);
  }
  .nav-dropdown-menu a {
    display: flex;
    flex-direction: column;
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-primary);
  }
  .nav-dropdown-menu a em {
    font-style: normal;
    font-size: 11.5px;
    font-weight: 400;
    color: var(--color-text-muted);
    margin-top: 2px;
  }
  .nav-dropdown-menu a:hover { background: var(--color-bg-sunken); }
}


/* ════════════════════════════════════════════════
   LETTER PAGE
════════════════════════════════════════════════ */
.letter-page { padding-top: 72px; }

.letter-hero {
  position: relative;
  padding: clamp(72px, 16vw, 140px) var(--page-gutter) clamp(28px, 5vw, 48px);
  background:
    /* sunrise: sun disc top-right + wave hints + warm glow */
    radial-gradient(circle 90px at calc(100% - 180px) 130px, rgba(232,168,92,0.55) 0%, rgba(232,168,92,0.22) 40%, rgba(232,168,92,0) 72%),
    radial-gradient(circle 22px at calc(100% - 180px) 130px, rgba(255,224,168,0.85) 0%, rgba(232,168,92,0.6) 60%, rgba(232,168,92,0) 100%),
    radial-gradient(ellipse 70% 55% at 50% 0%, rgba(232,168,92,0.14) 0%, rgba(232,168,92,0) 60%),
    linear-gradient(180deg, var(--color-bg-sunken) 0%, var(--color-bg) 100%);
  color: var(--color-text-primary);
  overflow: hidden;
  isolation: isolate;
}
/* horizon waves — tucked beneath the sun */
.letter-hero-waves {
  position: absolute;
  top: 158px;
  right: 60px;
  width: 320px;
  height: 80px;
  pointer-events: none;
  opacity: 0.5;
  z-index: 0;
}
.letter-hero-waves svg { width: 100%; height: 100%; }
/* horizon glow line */
.letter-hero::before {
  content: '';
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(232,168,92,0.55) 50%, transparent 100%);
}
/* oversized faded keel-ring motif on right */
.letter-hero::after {
  content: '';
  position: absolute;
  right: -180px; bottom: -200px;
  width: 540px; height: 540px;
  border-radius: 50%;
  border: 1.5px dashed rgba(11,42,63,0.12);
  background:
    radial-gradient(circle at center, rgba(232,168,92,0.10) 0%, rgba(232,168,92,0) 32%);
  z-index: 0;
}
/* second smaller dashed ring offset for depth */
.letter-hero-rings {
  position: absolute;
  right: -60px; bottom: -60px;
  width: 240px; height: 240px;
  border-radius: 50%;
  border: 1px dashed rgba(11,42,63,0.08);
  z-index: 0;
  pointer-events: none;
}

/* mobile: hide the sun + waves so text has room */
@media (max-width: 640px) {
  .letter-hero {
    background:
      radial-gradient(ellipse 90% 50% at 50% 0%, rgba(232,168,92,0.16) 0%, rgba(232,168,92,0) 60%),
      linear-gradient(180deg, var(--color-bg-sunken) 0%, var(--color-bg) 100%);
  }
  .letter-hero-waves { display: none; }
  .letter-hero-rings { width: 180px; height: 180px; right: -80px; bottom: -80px; }
  .letter-hero::after { right: -220px; bottom: -240px; }
}
.letter-hero-inner {
  max-width: 720px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* breath-rhythm dot trail */
.letter-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 24px;
}
.letter-eyebrow::before {
  content: '';
  width: 28px; height: 1px;
  background: var(--color-accent);
  opacity: 0.7;
}
.letter-eyebrow::after {
  content: '· · ·';
  letter-spacing: 4px;
  font-size: 13px;
  color: var(--color-accent);
  opacity: 0.55;
  margin-left: 4px;
}

.letter-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(38px, 8vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.025em;
  color: var(--color-text-primary);
  margin-bottom: 22px;
}
.letter-title em { font-style: italic; }

.letter-hero-line {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(20px, 4.4vw, 28px);
  line-height: 1.35;
  color: var(--color-text-body);
  max-width: 580px;
}

/* the letter body */
.letter-body {
  padding: clamp(20px, 4vw, 36px) var(--page-gutter) clamp(48px, 10vw, 96px);
}
.letter-prose {
  max-width: 640px;
  margin: 0 auto;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.72;
  color: var(--color-text-body);
}
.letter-prose p {
  margin-bottom: 1.4em;
}
.letter-prose h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(24px, 5.2vw, 30px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--color-text-primary);
  margin: 2.6em 0 0.9em;
}
.letter-prose h2:first-of-type { margin-top: 1em; }
.letter-prose blockquote {
  margin: 2em 0;
  padding: 0 0 0 18px;
  border-left: 2px solid var(--color-accent);
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(18px, 4vw, 22px);
  line-height: 1.45;
  color: var(--color-text-primary);
}
.letter-prose blockquote em { font-style: normal; }
.letter-prose strong { color: var(--color-text-primary); font-weight: 600; }
.letter-prose ul {
  margin: 1.4em 0 1.4em 0;
  padding-left: 0;
  list-style: none;
}
.letter-prose ul li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 0.9em;
}
.letter-prose ul li::before {
  content: '';
  position: absolute;
  left: 4px; top: 0.85em;
  width: 6px; height: 1px;
  background: var(--color-accent);
}
.letter-divider {
  width: 64px; height: 1px;
  background: var(--color-border);
  margin: 2.6em auto;
}

/* signature block (founder letter) */
.letter-signature {
  margin-top: 2.6em;
  padding-top: 1.6em;
  border-top: 1px solid var(--color-border-subtle);
}
.letter-signature .sig {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: 32px;
  line-height: 1;
  color: var(--color-text-primary);
  margin-bottom: 8px;
}
.letter-signature .role {
  font-size: 13px;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}


/* "What Keel does for X" callout */
.condition-callout {
  background: var(--color-bg-sunken);
  padding: clamp(40px, 8vw, 72px) var(--page-gutter);
}
.condition-callout-inner {
  max-width: 720px;
  margin: 0 auto;
}
.condition-callout-eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 14px;
}
.condition-callout h3 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(26px, 5.6vw, 36px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: 28px;
}
.condition-callout h3 em { font-style: italic; color: var(--color-accent); }
.condition-points {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
@media (min-width: 720px) {
  .condition-points { grid-template-columns: repeat(3, 1fr); gap: 22px; }
}
.condition-point {
  background: var(--color-bg-raised);
  border: 1px solid var(--color-border-subtle);
  border-radius: 14px;
  padding: 22px;
}
.condition-point-num {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 300;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 12px;
}
.condition-point h4 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 17px;
  line-height: 1.25;
  color: var(--color-text-primary);
  margin-bottom: 6px;
}
.condition-point p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-body);
  margin: 0;
}


/* CTA strip */
.letter-cta {
  padding: clamp(56px, 10vw, 96px) var(--page-gutter);
  background: linear-gradient(180deg, #FAFAF7 0%, #F5E3C2 60%, #E8C691 100%);
  text-align: center;
}
.letter-cta-inner { max-width: 560px; margin: 0 auto; }
.letter-cta h3 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(34px, 7vw, 52px);
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--color-text-primary);
  margin-bottom: 16px;
}
.letter-cta h3 em { font-style: italic; }
.letter-cta p {
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-body);
  margin-bottom: 32px;
}
.letter-cta-btn {
  display: inline-block;
  background: var(--color-text-primary);
  color: #fff;
  padding: 16px 32px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: var(--tracking-cta);
  text-transform: uppercase;
}
.letter-cta-btn:hover { background: #1A4A66; }


/* References */
.letter-refs {
  padding: clamp(40px, 8vw, 64px) var(--page-gutter);
  background: var(--color-bg);
  border-top: 1px solid var(--color-border-subtle);
}
.letter-refs-inner { max-width: 720px; margin: 0 auto; }
.letter-refs summary {
  list-style: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  gap: 10px;
  user-select: none;
}
.letter-refs summary::-webkit-details-marker { display: none; }
.letter-refs summary::after {
  content: '';
  width: 8px; height: 8px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  margin-left: 4px;
  transition: transform var(--transition-base);
}
.letter-refs[open] summary::after { transform: rotate(-135deg); margin-top: 4px; }
.letter-refs ol {
  margin: 24px 0 0 0;
  padding: 0;
  list-style: none;
  counter-reset: ref;
}
.letter-refs li {
  counter-increment: ref;
  position: relative;
  padding-left: 28px;
  margin-bottom: 14px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--color-text-muted);
}
.letter-refs li::before {
  content: counter(ref);
  position: absolute; left: 0; top: 0;
  font-family: var(--font-display);
  color: var(--color-accent);
  font-size: 12px;
  font-weight: 500;
}
.letter-refs a {
  color: var(--color-text-body);
  text-decoration: underline;
  text-decoration-color: rgba(11,42,63,0.2);
  text-underline-offset: 2px;
}

/* Disclaimer */
.letter-disclaimer {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--color-text-muted);
  font-style: italic;
}

/* footer */
.site-footer {
  padding: 36px var(--page-gutter);
  background: var(--color-text-primary);
  color: var(--color-text-inverse);
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
  font-size: 13px;
}
@media (min-width: 720px) {
  .site-footer { flex-direction: row; justify-content: space-between; align-items: center; }
}
.site-footer .footer-mark {
  font-family: var(--font-display);
  letter-spacing: 0.18em;
}
.site-footer a:hover { color: var(--color-accent); }
.site-footer-links { display: flex; gap: 22px; flex-wrap: wrap; opacity: 0.85; }