@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&family=JetBrains+Mono:ital,wght@0,400..700;1,400..700&family=Source+Serif+4:ital,opsz,wght@0,8..60,400..700;1,8..60,400..700&display=swap');

/* ==========================================================================
   ZeusCorp Cloud - Minimal Modern Design Tokens
   ========================================================================== */
:root {
  /* Brand Palette */
  --color-primary: #0066cc;
  --color-primary-focus: #0071e3;
  --color-primary-on-dark: #2997ff;

  /* Typography / Inks */
  --color-ink: #1d1d1f;
  --color-ink-muted-80: #333333;
  --color-ink-muted-48: #7a7a7a;
  --color-body: #1d1d1f;
  --color-body-muted: #cccccc;
  --color-body-on-dark: #ffffff;

  /* Borders / Dividers */
  --color-divider-soft: #f0f0f0;
  --color-hairline: #e0e0e0;
  --color-canvas: #ffffff;

  /* Stripe Typography Stacks */
  --font-sans: 'soehne-var', 'Soehne', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-heading: 'soehne-var', 'Soehne', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'soehne-mono', 'JetBrains Mono', 'SFMono-Regular', Menlo, Monaco, Consolas, monospace;
  --font-serif: 'Source Serif 4', 'Source Serif Pro', Georgia, 'Times New Roman', serif;

  /* Stripe Font Feature Settings */
  --font-features: "ss01", "zero", "cv05";

  /* Logo Color (Can be controlled independently from brand primary) */
  --color-logo: var(--color-primary);

  /* Default Sheet Dimensions */
  --sheet-width: 210mm;
  --sheet-height: 297mm;
  --sheet-padding: 24mm 26mm 22mm 26mm;
}

/* ==========================================================================
   Paper Sizes (International, US & Executive Formats)
   ========================================================================== */
/* 1. International Standard A4 (210mm x 297mm) */
.paper-a4 {
  --sheet-width: 210mm;
  --sheet-height: 297mm;
  --sheet-padding: 24mm 26mm 22mm 26mm;
  --sheet-pad-x: 26mm;
  --sheet-bleed-x: -26mm;
  --sheet-pad-bottom: 22mm;
}

/* 2. US Letter Standard (8.5in x 11in = 215.9mm x 279.4mm) */
.paper-letter {
  --sheet-width: 215.9mm;
  --sheet-height: 279.4mm;
  --sheet-padding: 22mm 24mm 20mm 24mm;
  --sheet-pad-x: 24mm;
  --sheet-bleed-x: -24mm;
  --sheet-pad-bottom: 20mm;
}

/* 3. US Legal Standard (8.5in x 14in = 215.9mm x 355.6mm) */
.paper-legal {
  --sheet-width: 215.9mm;
  --sheet-height: 355.6mm;
  --sheet-padding: 26mm 26mm 22mm 26mm;
  --sheet-pad-x: 26mm;
  --sheet-bleed-x: -26mm;
  --sheet-pad-bottom: 22mm;
}

/* 4. Executive / Monarch (7.25in x 10.5in = 184.15mm x 266.7mm) */
.paper-monarch {
  --sheet-width: 184.15mm;
  --sheet-height: 266.7mm;
  --sheet-padding: 20mm 22mm 18mm 22mm;
  --sheet-pad-x: 22mm;
  --sheet-bleed-x: -22mm;
  --sheet-pad-bottom: 18mm;
  font-size: 12px;
}
.paper-monarch .letter-content { font-size: 11.5px; line-height: 1.55; }
.paper-monarch .brand-emblem { width: 32px; height: 32px; }
.paper-monarch .footer-columns { font-size: 8.5px; }

/* 5. A5 Compact / Memo (148mm x 210mm = 5.83in x 8.27in) */
.paper-a5 {
  --sheet-width: 148mm;
  --sheet-height: 210mm;
  --sheet-padding: 16mm 18mm 14mm 18mm;
  --sheet-pad-x: 18mm;
  --sheet-bleed-x: -18mm;
  --sheet-pad-bottom: 14mm;
  font-size: 11.5px;
}
.paper-a5 .letter-content { font-size: 11px; line-height: 1.5; }
.paper-a5 .meta-grid { font-size: 10px; margin-bottom: 14px; }
.paper-a5 .letter-subject { font-size: 12px; margin-bottom: 10px; }
.paper-a5 .brand-emblem { width: 28px; height: 28px; }
.paper-a5 .brand-wordmark h1 { font-size: 15px; }
.paper-a5 .footer-columns { font-size: 8px; gap: 10px; }

/* 6. B5 International (176mm x 250mm = 6.93in x 9.84in) */
.paper-b5 {
  --sheet-width: 176mm;
  --sheet-height: 250mm;
  --sheet-padding: 18mm 20mm 16mm 20mm;
  --sheet-pad-x: 20mm;
  --sheet-bleed-x: -20mm;
  --sheet-pad-bottom: 16mm;
  font-size: 11.5px;
}
.paper-b5 .letter-content { font-size: 11px; line-height: 1.55; }
.paper-b5 .brand-emblem { width: 30px; height: 30px; }
.paper-b5 .footer-columns { font-size: 8px; }

/* 7. US Statement / Half Letter (5.5in x 8.5in = 139.7mm x 215.9mm) */
.paper-statement {
  --sheet-width: 139.7mm;
  --sheet-height: 215.9mm;
  --sheet-padding: 15mm 16mm 14mm 16mm;
  --sheet-pad-x: 16mm;
  --sheet-bleed-x: -16mm;
  --sheet-pad-bottom: 14mm;
  font-size: 11px;
}
.paper-statement .letter-content { font-size: 10.5px; line-height: 1.5; }
.paper-statement .meta-grid { font-size: 9.5px; margin-bottom: 12px; }
.paper-statement .letter-subject { font-size: 11.5px; margin-bottom: 8px; }
.paper-statement .brand-emblem { width: 26px; height: 26px; }
.paper-statement .brand-wordmark h1 { font-size: 14px; }
.paper-statement .footer-columns { font-size: 7.5px; gap: 8px; }

/* 8. Folio / F4 Legal (210mm x 330mm = 8.27in x 13.0in) */
.paper-folio {
  --sheet-width: 210mm;
  --sheet-height: 330mm;
  --sheet-padding: 26mm 26mm 22mm 26mm;
  --sheet-pad-x: 26mm;
  --sheet-bleed-x: -26mm;
  --sheet-pad-bottom: 22mm;
}

/* ==========================================================================
   Base Sheet & Preview Canvas
   ========================================================================== */
* {
  box-sizing: border-box;
}

body.studio-mode {
  margin: 0;
  padding: 0;
  background-color: #0b0f17;
  color: #e6edf3;
  font-family: var(--font-sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Physical Letterhead Sheet */
.letterhead-sheet {
  width: var(--sheet-width);
  min-height: var(--sheet-height);
  height: var(--sheet-height);
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-sans);
  padding: var(--sheet-padding);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  margin: 0 auto;
  box-shadow: 0 20px 45px -10px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.08);
  border-radius: 2px;
  overflow: hidden;
  font-feature-settings: var(--font-features);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Watermark: Ultra subtle, non-intrusive */
.letterhead-watermark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40%;
  max-width: 280px;
  opacity: 0.03;
  pointer-events: none;
  z-index: 0;
  color: var(--color-logo, var(--color-primary));
}

.letterhead-watermark svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* Zones */
.letterhead-header,
.letterhead-body,
.letterhead-footer {
  position: relative;
  z-index: 1;
}

.letterhead-body {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

/* Guides & Page 2 elements default hidden */
.guide-fold-top,
.guide-fold-bottom,
.guide-safe-area,
.running-header-page2,
.editorial-rule,
.editorial-footer-text,
.modern-meta-bar {
  display: none;
}

/* ==========================================================================
   Envelope Fold & Safe Area Guides
   ========================================================================== */
.show-guides .guide-fold-top,
.show-guides .guide-fold-bottom {
  display: block;
  left: 0;
  right: 0;
  height: 1px;
  border-top: 1px dashed rgba(239, 68, 68, 0.4);
  position: absolute;
  pointer-events: none;
  z-index: 99;
}

.show-guides .guide-fold-top {
  top: 33.33%;
}

.show-guides .guide-fold-top::after {
  content: "✂ Fold Line 1 (#10 / DL 33%)";
  position: absolute;
  right: 12px;
  top: -14px;
  font-size: 8px;
  color: #ef4444;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

.show-guides .guide-fold-bottom {
  top: 66.66%;
}

.show-guides .guide-fold-bottom::after {
  content: "✂ Fold Line 2 (#10 / DL 66%)";
  position: absolute;
  right: 12px;
  top: -14px;
  font-size: 8px;
  color: #ef4444;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

.show-guides .guide-safe-area {
  display: block;
  position: absolute;
  pointer-events: none;
  z-index: 99;
  top: 6mm;
  bottom: 6mm;
  left: 6mm;
  right: 6mm;
  border: 1px dotted rgba(59, 130, 246, 0.35);
}

.show-guides .guide-safe-area::before {
  content: "Safe Zone Boundary (6mm / 0.25\")";
  position: absolute;
  top: 4px;
  left: 6px;
  font-size: 8px;
  color: #3b82f6;
  font-family: var(--font-mono);
}

/* ==========================================================================
   Second Sheet (Multi-Page Continuation Sheet)
   ========================================================================== */
.running-header-page2 {
  justify-content: space-between;
  align-items: center;
  padding-bottom: 12px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--color-hairline);
  font-size: 11px;
  color: var(--color-ink-muted-48);
}

.sheet-page-2 .letterhead-header {
  display: none !important;
}

.sheet-page-2 .running-header-page2 {
  display: flex !important;
}

.sheet-page-2 .letterhead-footer {
  display: none !important;
}

/* ==========================================================================
   DESIGN 1: "The Executive" (Clean Minimalist Corporate)
   ========================================================================== */
.lh-executive {
  border-top: 3px solid var(--color-primary);
}

.lh-executive .letterhead-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-hairline);
  margin-bottom: 26px;
}

.brand-identity {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-emblem {
  width: 36px;
  height: 36px;
  color: var(--color-logo, var(--color-primary));
}

.brand-wordmark h1 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-ink);
  line-height: 1.1;
}

.header-contacts {
  text-align: right;
  font-size: 11px;
  line-height: 1.55;
  color: var(--color-ink-muted-80);
}

.header-contacts a {
  color: var(--color-ink);
  text-decoration: none;
  font-weight: 500;
}

.header-contacts a:hover {
  color: var(--color-primary);
}

/* Metadata Grid */
.meta-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
  margin-bottom: 26px;
  font-size: 12.5px;
}

.recipient-block {
  line-height: 1.5;
  color: var(--color-ink);
}

.recipient-title {
  font-weight: 600;
  color: var(--color-ink);
}

.doc-meta-block {
  text-align: right;
  line-height: 1.6;
}

.doc-meta-row {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.doc-meta-label {
  color: var(--color-ink-muted-48);
  font-weight: 500;
}

.doc-meta-value {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--color-ink);
}

/* Letter Subject & Content */
.letter-subject {
  font-family: var(--font-heading);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  margin: 0 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-divider-soft);
}

.letter-content {
  font-family: var(--font-sans);
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--color-ink);
}

.letter-content p {
  margin: 0 0 14px 0;
}

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

.letter-content .callout-box {
  border-left: 2px solid var(--color-primary);
  padding: 10px 14px;
  margin: 16px 0;
  background: #fbfcfd;
  font-size: 13px;
  color: var(--color-ink-muted-80);
}

/* Sign-off */
.letter-signoff {
  margin-top: 28px;
}

.signoff-closing {
  font-size: 13.5px;
  color: var(--color-ink);
  margin-bottom: 22px;
}

.signature-stamp {
  height: 36px;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
}

.signature-stamp .signature-font {
  font-family: 'Brush Script MT', cursive, var(--font-serif);
  font-size: 26px;
  color: var(--color-primary);
  font-style: italic;
}

.signee-name {
  font-family: var(--font-heading);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-ink);
}

.signee-title {
  font-size: 11.5px;
  color: var(--color-ink-muted-48);
}

/* Common Footer: Clean Dual-Office Layout */
.footer-columns {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
  font-size: 9.5px;
  line-height: 1.55;
  color: var(--color-ink-muted-48);
  border-top: 1px solid var(--color-hairline);
  padding-top: 12px;
  margin-top: 20px;
}

.footer-col-title {
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-ink);
  margin-bottom: 2px;
}

.footer-col a {
  color: var(--color-ink-muted-80);
  text-decoration: none;
}

.footer-col a:hover {
  color: var(--color-primary);
}

/* ==========================================================================
   DESIGN 2: "The Architectural Grid" (Structured Precision)
   ========================================================================== */
.lh-global {
  border-left: 3px solid var(--color-primary);
}

.lh-global .letterhead-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding-bottom: 16px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--color-ink);
}

.lh-global .brand-emblem {
  width: 40px;
  height: 40px;
  color: var(--color-logo, var(--color-primary));
}

.lh-global .brand-wordmark h1 {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.lh-global .meta-grid {
  display: grid;
}

.lh-global .footer-columns {
  display: grid;
}

/* ==========================================================================
   DESIGN 3: "Editorial Minimal" (Prestige Clean)
   ========================================================================== */
.lh-editorial .letterhead-header {
  display: block;
  text-align: center;
  margin-bottom: 32px;
}

.lh-editorial .brand-identity {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.lh-editorial .brand-emblem {
  width: 36px;
  height: 36px;
  margin: 0 auto 8px auto;
  color: var(--color-logo, var(--color-primary));
}

.lh-editorial .brand-wordmark h1 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink);
}

.lh-editorial .editorial-rule {
  display: block;
  width: 36px;
  height: 1px;
  background: var(--color-hairline);
  margin: 12px auto 0 auto;
}

.lh-editorial .letter-content {
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.75;
  color: #242426;
}

.lh-editorial .header-contacts {
  display: none;
}

.lh-editorial .footer-columns {
  display: none;
}

.lh-editorial .editorial-footer-text {
  display: block;
  text-align: center;
  border-top: 1px solid var(--color-divider-soft);
  padding-top: 12px;
  font-size: 9.5px;
  letter-spacing: 0.02em;
  color: var(--color-ink-muted-48);
  line-height: 1.6;
}

.lh-editorial .footer-divider {
  margin: 0 8px;
  color: var(--color-hairline);
}

/* ==========================================================================
   DESIGN 4: "Modern Tech" (Crisp Documentation / Stripe-Docs Inspired)
   ========================================================================== */
.lh-fintech .letterhead-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-hairline);
}

.lh-fintech .brand-emblem {
  width: 34px;
  height: 34px;
  color: var(--color-logo, var(--color-primary));
}

.lh-fintech .brand-wordmark h1 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.lh-fintech .meta-grid {
  display: none;
}

.lh-fintech .modern-meta-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding: 10px 0;
  margin-bottom: 22px;
  border-top: 1px solid var(--color-divider-soft);
  border-bottom: 1px solid var(--color-divider-soft);
}

.lh-fintech .meta-cell-label {
  font-size: 9px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-ink-muted-48);
  margin-bottom: 2px;
}

.lh-fintech .meta-cell-val {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--color-ink);
}

.lh-fintech .footer-columns {
  display: grid;
}

/* ==========================================================================
   DESIGN 5: "Swiss International" (Bauhaus Modernist Precision)
   ========================================================================== */
.lh-swiss {
  border-top: 4px solid var(--color-ink);
  border-bottom: 4px solid var(--color-ink);
}

.lh-swiss .letterhead-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-ink);
  margin-bottom: 28px;
}

.lh-swiss .brand-emblem {
  width: 40px;
  height: 40px;
  color: var(--color-logo, var(--color-primary));
}

.lh-swiss .brand-wordmark h1 {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

.lh-swiss .letter-subject {
  font-size: 15px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  border-bottom: 2px solid var(--color-ink);
}

.lh-swiss .footer-columns {
  border-top: 1px solid var(--color-ink);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: -0.01em;
}

/* ==========================================================================
   DESIGN 6: "Perimeter Frame" (Bespoke Stationery Border)
   ========================================================================== */
.lh-framed {
  position: relative;
}

.lh-framed::after {
  content: "";
  position: absolute;
  top: 8mm;
  bottom: 8mm;
  left: 8mm;
  right: 8mm;
  border: 1px solid var(--color-hairline);
  pointer-events: none;
  z-index: 0;
}

.lh-framed .letterhead-header {
  border-bottom: 1px solid var(--color-hairline);
  padding-bottom: 16px;
  margin-bottom: 24px;
}

.lh-framed .brand-emblem {
  width: 34px;
  height: 34px;
  color: var(--color-logo, var(--color-primary));
}

/* ==========================================================================
   DESIGN 7: "Nordic Whisper" (Micro-Minimalist Luxury)
   ========================================================================== */
.lh-nordic {
  padding-top: 28mm;
  padding-bottom: 24mm;
}

.lh-nordic .letterhead-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--color-divider-soft);
  padding-bottom: 14px;
  margin-bottom: 32px;
}

.lh-nordic .brand-emblem {
  width: 24px;
  height: 24px;
  color: var(--color-logo, var(--color-primary));
}

.lh-nordic .brand-wordmark h1 {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-muted-80);
}

.lh-nordic .header-contacts {
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--color-ink-muted-48);
}

.lh-nordic .letter-subject {
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0;
  border-bottom: 1px solid var(--color-divider-soft);
}

.lh-nordic .footer-columns {
  border-top: 1px solid var(--color-divider-soft);
  font-size: 9px;
  letter-spacing: 0.03em;
}

/* ==========================================================================
   DESIGN 8: "Monolith Modern" (Clean Architectural Offset)
   ========================================================================== */
.lh-monolith .letterhead-header {
  display: flex;
  flex-direction: row-reverse;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 16px;
  margin-bottom: 28px;
}

.lh-monolith .brand-emblem {
  width: 38px;
  height: 38px;
  color: var(--color-logo, var(--color-primary));
}

.lh-monolith .brand-wordmark h1 {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.lh-monolith .header-contacts {
  text-align: left;
}

/* ==========================================================================
   DESIGN 9: "Angled Colorblock" (Asymmetric Bauhaus Wedge & High Contrast)
   ========================================================================== */
.lh-geometric {
  position: relative;
  padding-top: 0 !important;
  padding-bottom: 0 !important;
}

.lh-geometric .letterhead-header {
  margin: 0 var(--sheet-bleed-x, -26mm) 28px var(--sheet-bleed-x, -26mm);
  padding: 24px var(--sheet-pad-x, 26mm);
  background: var(--color-ink, #0f172a);
  color: #ffffff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  clip-path: polygon(0 0, 100% 0, 100% 84%, 0 100%);
  padding-bottom: 30px;
}

.lh-geometric .letterhead-header::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: var(--color-primary, #0066cc);
}

.lh-geometric .brand-emblem {
  width: 40px;
  height: 40px;
  color: #ffffff !important;
}

.lh-geometric .brand-emblem path {
  fill: #ffffff !important;
}

.lh-geometric .brand-wordmark h1 {
  color: #ffffff !important;
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.lh-geometric .header-contacts {
  color: rgba(255, 255, 255, 0.8);
}

.lh-geometric .header-contacts a {
  color: #ffffff !important;
}

.lh-geometric .letter-subject {
  font-size: 14.5px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--color-primary, #0066cc);
  display: flex;
  align-items: center;
  gap: 8px;
}

.lh-geometric .letter-subject::before {
  content: "■";
  color: var(--color-primary, #0066cc);
  font-size: 11px;
}

.lh-geometric .callout-box {
  background: #f8fafc;
  border-left: 5px solid var(--color-ink, #0f172a);
  padding: 12px 18px;
}

.lh-geometric .letterhead-footer {
  margin: 36px var(--sheet-bleed-x, -26mm) 0 var(--sheet-bleed-x, -26mm);
  background: #f8fafc;
  border-top: 2px solid var(--color-primary, #0066cc);
  position: relative;
  z-index: 5;
}

.lh-geometric .footer-columns {
  margin: 0;
  padding: 18px var(--sheet-pad-x, 26mm) var(--sheet-pad-bottom, 22mm) var(--sheet-pad-x, 26mm);
  background: transparent;
  border-top: none;
}

/* ==========================================================================
   DESIGN 10: "Horizon Colorblock" (Edge-to-Edge Solid Banner & Contrast Baseline)
   ========================================================================== */
.lh-colorblock-horizon {
  position: relative;
  padding-top: 0 !important;
  padding-bottom: 0 !important;
}

.lh-colorblock-horizon .letterhead-header {
  margin: 0 var(--sheet-bleed-x, -26mm) 28px var(--sheet-bleed-x, -26mm);
  padding: 24px var(--sheet-pad-x, 26mm);
  background: var(--color-ink, #0f172a);
  color: #ffffff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  border-bottom: 4px solid var(--color-primary, #0066cc);
}

.lh-colorblock-horizon .brand-emblem {
  width: 40px;
  height: 40px;
  color: #ffffff !important;
}

.lh-colorblock-horizon .brand-emblem path {
  fill: #ffffff !important;
}

.lh-colorblock-horizon .brand-wordmark h1 {
  color: #ffffff !important;
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.lh-colorblock-horizon .header-contacts {
  color: rgba(255, 255, 255, 0.85);
}

.lh-colorblock-horizon .header-contacts a {
  color: #ffffff !important;
}

.lh-colorblock-horizon .letter-subject {
  font-size: 14.5px;
  font-weight: 700;
  border-left: 5px solid var(--color-primary, #0066cc);
  padding: 6px 0 6px 14px;
  margin-bottom: 22px;
  border-bottom: none;
}

.lh-colorblock-horizon .callout-box {
  background: #f8fafc;
  border-left: 5px solid var(--color-primary, #0066cc);
  padding: 12px 18px;
}

.lh-colorblock-horizon .letterhead-footer {
  margin: 36px var(--sheet-bleed-x, -26mm) 0 var(--sheet-bleed-x, -26mm);
  background: #0f172a;
  border-top: 3px solid var(--color-primary, #0066cc);
  position: relative;
  z-index: 5;
}

.lh-colorblock-horizon .footer-columns {
  margin: 0;
  padding: 20px var(--sheet-pad-x, 26mm) var(--sheet-pad-bottom, 22mm) var(--sheet-pad-x, 26mm);
  background: transparent;
  color: #94a3b8;
  border-top: none;
}

.lh-colorblock-horizon .footer-col-title {
  color: #ffffff;
}

.lh-colorblock-horizon .footer-columns a {
  color: #38bdf8 !important;
}

/* ==========================================================================
   DESIGN 11: "Split Colorblock" (Contrasting Dual-Block Architecture)
   ========================================================================== */
.lh-colorblock-split {
  position: relative;
  padding-top: 0 !important;
  padding-bottom: 0 !important;
}

.lh-colorblock-split .letterhead-header {
  margin: 0 var(--sheet-bleed-x, -26mm) 28px var(--sheet-bleed-x, -26mm);
  padding: 0;
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  background: transparent;
  border-bottom: 2px solid var(--color-hairline);
}

.lh-colorblock-split .brand-identity {
  background: var(--color-ink, #0f172a);
  color: #ffffff;
  padding: 22px 24px 22px var(--sheet-pad-x, 26mm);
  flex: 1.3;
  display: flex;
  align-items: center;
  border-right: 4px solid var(--color-primary, #0066cc);
}

.lh-colorblock-split .brand-emblem {
  color: #ffffff !important;
  width: 38px;
  height: 38px;
}

.lh-colorblock-split .brand-emblem path {
  fill: #ffffff !important;
}

.lh-colorblock-split .brand-wordmark h1 {
  color: #ffffff !important;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.lh-colorblock-split .header-contacts {
  background: #f8fafc;
  padding: 22px var(--sheet-pad-x, 26mm) 22px 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-end;
  text-align: right;
  font-size: 11px;
}

.lh-colorblock-split .letter-subject {
  font-size: 14.5px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  padding: 8px 12px;
  background: #f8fafc;
  border-left: 4px solid var(--color-primary, #0066cc);
  margin-bottom: 22px;
  border-bottom: none;
}

.lh-colorblock-split .callout-box {
  background: #f8fafc;
  border-left: 4px solid var(--color-ink, #0f172a);
  padding: 12px 18px;
}

.lh-colorblock-split .letterhead-footer {
  margin: 36px var(--sheet-bleed-x, -26mm) 0 var(--sheet-bleed-x, -26mm);
  background: #f8fafc;
  border-top: 3px solid var(--color-ink, #0f172a);
  position: relative;
  z-index: 5;
}

.lh-colorblock-split .footer-columns {
  margin: 0;
  padding: 18px var(--sheet-pad-x, 26mm) var(--sheet-pad-bottom, 22mm) var(--sheet-pad-x, 26mm);
  background: transparent;
  border-top: none;
}

/* ==========================================================================
   DESIGN 12: "Accent Band Colorblock" (Full Brand Primary Canopy & Clean Baseline)
   ========================================================================== */
.lh-colorblock-band {
  position: relative;
  padding-top: 0 !important;
  padding-bottom: 0 !important;
}

.lh-colorblock-band .letterhead-header {
  margin: 0 var(--sheet-bleed-x, -26mm) 28px var(--sheet-bleed-x, -26mm);
  padding: 24px var(--sheet-pad-x, 26mm);
  background: var(--color-primary, #0066cc);
  color: #ffffff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  border-bottom: 4px solid var(--color-ink, #0f172a);
}

.lh-colorblock-band .brand-emblem {
  width: 40px;
  height: 40px;
  color: #ffffff !important;
}

.lh-colorblock-band .brand-emblem path {
  fill: #ffffff !important;
}

.lh-colorblock-band .brand-wordmark h1 {
  color: #ffffff !important;
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.lh-colorblock-band .header-contacts {
  color: rgba(255, 255, 255, 0.9);
}

.lh-colorblock-band .header-contacts a {
  color: #ffffff !important;
}

.lh-colorblock-band .letter-subject {
  font-size: 14.5px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--color-primary, #0066cc);
}

.lh-colorblock-band .callout-box {
  background: #f8fafc;
  border-left: 5px solid var(--color-primary, #0066cc);
  padding: 12px 18px;
}

.lh-colorblock-band .letterhead-footer {
  margin: 36px var(--sheet-bleed-x, -26mm) 0 var(--sheet-bleed-x, -26mm);
  background: #f8fafc;
  border-top: 3px solid var(--color-primary, #0066cc);
  position: relative;
  z-index: 5;
}

.lh-colorblock-band .footer-columns {
  margin: 0;
  padding: 18px var(--sheet-pad-x, 26mm) var(--sheet-pad-bottom, 22mm) var(--sheet-pad-x, 26mm);
  background: transparent;
  border-top: none;
}

/* ==========================================================================
   Blank Stationery Mode (Toggles Letterhead Text Visibility)
   ========================================================================== */
.hide-letter-text .meta-grid,
.hide-letter-text .modern-meta-bar,
.hide-letter-text .letter-subject,
.hide-letter-text .letter-content,
.hide-letter-text .letter-signoff {
  display: none !important;
}

.hide-letter-text .letterhead-body {
  flex-grow: 1;
}

.blank-stationery-watermark {
  display: none;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #adb5bd;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-family: var(--font-mono);
  border: 1px dashed #ced4da;
  padding: 8px 18px;
  border-radius: 4px;
  pointer-events: none;
}

.hide-letter-text .blank-stationery-watermark {
  display: block;
}

@media print {
  .blank-stationery-watermark {
    display: none !important;
  }
}

/* ==========================================================================
   Editable States
   ========================================================================== */
[contenteditable="true"] {
  outline: none;
  transition: background-color 0.15s;
  border-radius: 2px;
}

.editable-active [contenteditable="true"]:hover {
  background-color: rgba(0, 102, 204, 0.04);
}

.editable-active [contenteditable="true"]:focus {
  background-color: rgba(0, 102, 204, 0.06);
  box-shadow: 0 0 0 1px var(--color-primary);
}

/* ==========================================================================
   Print Calibration
   ========================================================================== */
@media print {
  @page {
    margin: 0;
  }

  html, body {
    margin: 0 !important;
    padding: 0 !important;
    background: #ffffff !important;
    color: #1d1d1f !important;
    width: 100% !important;
    height: 100% !important;
  }

  .studio-toolbar,
  .studio-header,
  .no-print,
  .show-guides .guide-fold-top,
  .show-guides .guide-fold-bottom,
  .show-guides .guide-safe-area {
    display: none !important;
  }

  .sheet-wrapper {
    padding: 0 !important;
    margin: 0 !important;
    display: block !important;
  }

  .letterhead-sheet {
    box-shadow: none !important;
    border-radius: 0 !important;
    margin: 0 !important;
    width: 100% !important;
    min-height: 100vh !important;
    height: 100vh !important;
    page-break-inside: avoid !important;
    page-break-after: avoid !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }

  [contenteditable="true"]:hover,
  [contenteditable="true"]:focus {
    background: transparent !important;
    box-shadow: none !important;
  }
}