/* ==========================================================================
   Level Ground LLC — Corporate Website Stylesheet
   Palette: Architectural Daylight (Warm Limestone, Travertine, Atlantic Pine & Terracotta)
   ========================================================================== */

:root {
  /* Surface Palette — Warm Limestone, Travertine & Parchment */
  --bg-header: rgba(246, 244, 239, 0.94);
  --header-border: #DCD6CA;
  --header-text: #14181F;
  --header-nav-text: #3D4552;
  --header-nav-hover-bg: #EFECE4;
  --header-nav-hover-text: #14181F;
  --header-btn-bg: #FAF8F5;
  --header-btn-text: #14181F;
  --header-btn-border: #C5BDB0;
  --header-btn-hover-bg: #1B4D3E;
  --header-btn-hover-text: #FFFFFF;

  --bg-canvas: #F6F4EF;
  --bg-surface: #EFECE4;
  --bg-panel: #FAF8F5;
  --panel-accent-bar: #1B4D3E;

  --bg-footer: #ECE8DF;
  --footer-border: #DCD6CA;
  --footer-text: #14181F;
  --footer-secondary: #3D4552;
  --footer-muted: #5A6270;

  /* Typography Ink — Deep Slate & Charcoal */
  --text-primary: #14181F;
  --text-secondary: #3D4552;
  --text-muted: #5A6270;

  /* Brand & Structural Accents — Atlantic Pine & Architectural Terracotta */
  --accent-primary: #1B4D3E;
  --accent-primary-hover: #13382D;
  --btn-primary-text: #FFFFFF;
  --btn-secondary-bg: #FAF8F5;
  --btn-secondary-text: #14181F;
  --btn-secondary-border: #C5BDB0;
  --btn-secondary-hover-bg: #EFECE4;
  --link-accent: #1B4D3E;
  --link-accent-hover: #13382D;
  --accent-datum: #8C3D20;

  /* Status Indicators */
  --status-live-bg: #E4EFEA;
  --status-live-text: #143D30;
  --status-live-border: #B5D1C6;

  --status-dev-bg: #F5EAE4;
  --status-dev-text: #7A3217;
  --status-dev-border: #DFC2B4;

  /* Datum Hairlines & Borders */
  --border-datum: #DCD6CA;
  --border-strong: #C5BDB0;

  /* Geometric Datum Mark Tokens */
  --logo-bg: #FAF8F5;
  --logo-stroke: #1B4D3E;
  --logo-point: #8C3D20;
  --footer-logo-bg: #FAF8F5;
  --footer-logo-stroke: #1B4D3E;
  --footer-logo-point: #8C3D20;

  /* Typography Stacks */
  --font-display: 'Iowan Old Style', 'Palatino Linotype', 'Book Antiqua', Palatino, Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Inter', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'SF Mono', ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, monospace;

  /* Layout & Spacing */
  --container-max: 1120px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
}

/* Skip Navigation Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 1000;
  padding: 10px 16px;
  background-color: var(--accent-primary);
  color: var(--btn-primary-text);
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: 12px;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Site Header & Primary Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--bg-header);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--header-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  gap: 24px;
}

.brand-identity {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-height: 44px;
}

.brand-mark {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}

.brand-text-group {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--header-text);
}

.header-nav-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--header-nav-text);
  border-radius: var(--radius-sm);
  transition: color 0.15s ease, background-color 0.15s ease;
}

.nav-link:hover {
  color: var(--header-nav-hover-text);
  background-color: var(--header-nav-hover-bg);
}

.header-contact-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--header-btn-text);
  background-color: var(--header-btn-bg);
  border: 1px solid var(--header-btn-border);
  border-radius: var(--radius-sm);
  transition: border-color 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

.header-contact-btn:hover {
  background-color: var(--header-btn-hover-bg);
  border-color: var(--header-btn-hover-bg);
  color: var(--header-btn-hover-text);
}

/* ==========================================================================
   Hero Section — Company Introduction & Portfolio Index Ledger
   ========================================================================== */
.hero-section {
  padding: 72px 0 80px;
  border-bottom: 1px solid var(--border-datum);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 56px;
  align-items: start;
}

.datum-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-datum);
  margin: 0 0 18px 0;
}

.datum-kicker::before {
  content: '';
  display: inline-block;
  width: 18px;
  height: 2px;
  background-color: var(--accent-datum);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 1.6rem + 2.2vw, 3.35rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin: 0 0 24px 0;
}

.hero-lead {
  font-size: 18px;
  line-height: 1.65;
  color: var(--text-secondary);
  margin: 0 0 32px 0;
  max-width: 60ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: var(--btn-primary-text);
  border: 1px solid var(--accent-primary);
}

.btn-primary:hover {
  background-color: var(--accent-primary-hover);
  border-color: var(--accent-primary-hover);
}

.btn-secondary {
  background-color: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border: 1px solid var(--btn-secondary-border);
}

.btn-secondary:hover {
  background-color: var(--btn-secondary-hover-bg);
  border-color: var(--text-primary);
}

/* Portfolio Summary Ledger (Right Column in Hero) */
.portfolio-ledger {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-datum);
  border-top: 3px solid var(--panel-accent-bar);
  border-radius: var(--radius-md);
  padding: 24px;
}

.ledger-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-datum);
  margin-bottom: 16px;
}

.ledger-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
  margin: 0;
}

.ledger-subtitle {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

.ledger-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.ledger-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--border-datum);
}

.ledger-item:first-child {
  padding-top: 2px;
}

.ledger-item:last-child {
  padding-bottom: 2px;
  border-bottom: none;
}

.ledger-item-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}

.ledger-product-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: 4px;
}

.status-live {
  background-color: var(--status-live-bg);
  color: var(--status-live-text);
  border: 1px solid var(--status-live-border);
}

.status-dev {
  background-color: var(--status-dev-bg);
  color: var(--status-dev-text);
  border: 1px solid var(--status-dev-border);
}

.ledger-product-desc {
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-secondary);
  margin: 0;
}

.ledger-product-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--link-accent);
}

.ledger-product-link:hover {
  color: var(--link-accent-hover);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ==========================================================================
   Section Datum Header Pattern
   ========================================================================== */
.datum-section {
  padding: 72px 0;
  border-bottom: 1px solid var(--border-datum);
}

.datum-section-surface {
  background-color: var(--bg-surface);
}

.section-index-bar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-bottom: 14px;
  margin-bottom: 40px;
  border-bottom: 2px solid var(--border-strong);
}

.section-index-label {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-datum);
  font-variant-numeric: tabular-nums;
}

.section-index-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}

/* ==========================================================================
   Section 01 — Available Software: Plotmark
   ========================================================================== */
.plotmark-intro-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 48px;
  align-items: start;
  margin-bottom: 52px;
}

.product-brand-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.plotmark-logo {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.product-title {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 1.5rem + 1.2vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0;
  color: var(--text-primary);
}

.product-subtitle {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.product-lead {
  font-size: 17px;
  line-height: 1.65;
  color: var(--text-secondary);
  margin: 0 0 20px 0;
}

.product-context-p {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-secondary);
  margin: 0 0 28px 0;
}

.product-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

/* Verified Capabilities Specification List */
.capabilities-ledger {
  border-top: 1px solid var(--border-datum);
}

.capability-row {
  padding: 18px 0;
  border-bottom: 1px solid var(--border-datum);
}

.capability-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 6px 0;
}

.capability-desc {
  font-size: 14.5px;
  line-height: 1.58;
  color: var(--text-secondary);
  margin: 0;
}

/* Real Product Imagery Showcase (3-Screen Gallery) */
.product-gallery-wrapper {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-datum);
  border-top: 3px solid var(--panel-accent-bar);
  border-radius: var(--radius-md);
  padding: 32px;
}

.gallery-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-datum);
}

.gallery-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-primary);
  margin: 0;
}

.gallery-provenance {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0;
}

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.screenshot-figure {
  margin: 0;
  display: flex;
  flex-direction: column;
}

.screenshot-frame {
  background-color: #08090C;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 8px;
  box-shadow: 0 8px 24px rgba(10, 14, 20, 0.14);
  margin-bottom: 14px;
}

.screenshot-frame img {
  width: 100%;
  height: auto;
  aspect-ratio: 390 / 844;
  object-fit: cover;
  object-position: top center;
  border-radius: 8px;
}

.screenshot-caption-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.screenshot-caption-desc {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-secondary);
}

/* ==========================================================================
   Section 02 — In Development (Acervo & Travel Binder)
   ========================================================================== */
.in-dev-intro {
  max-width: 68ch;
  margin-bottom: 36px;
}

.section-heading {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 1.4rem + 1vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text-primary);
  margin: 0 0 14px 0;
}

.section-lead {
  font-size: 16.5px;
  line-height: 1.65;
  color: var(--text-secondary);
  margin: 0;
}

.in-dev-ledger {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border-datum);
}

.in-dev-entry {
  padding-left: 20px;
  border-left: 3px solid var(--accent-datum);
}

.in-dev-meta-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

.in-dev-domain-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}

.in-dev-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 10px 0;
}

.in-dev-desc {
  font-size: 15.5px;
  line-height: 1.62;
  color: var(--text-secondary);
  margin: 0;
}

/* ==========================================================================
   Section 03 — Company / About Level Ground LLC
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 56px;
  align-items: start;
}

.about-prose p {
  font-size: 16px;
  line-height: 1.68;
  color: var(--text-secondary);
  margin: 0 0 18px 0;
}

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

.corporate-facts-dl {
  margin: 0;
  background-color: var(--bg-panel);
  border: 1px solid var(--border-datum);
  border-top: 3px solid var(--panel-accent-bar);
  border-radius: var(--radius-sm);
  padding: 24px;
}

.fact-row {
  display: grid;
  grid-template-columns: 145px 1fr;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-datum);
  font-size: 14px;
}

.fact-row:first-child {
  padding-top: 0;
}

.fact-row:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.fact-row dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.fact-row dd {
  margin: 0;
  font-weight: 500;
  color: var(--text-primary);
}

/* ==========================================================================
   Section 04 — Corporate Contact
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-datum);
  border-top: 3px solid var(--panel-accent-bar);
  border-radius: var(--radius-md);
  padding: 28px;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 8px 0;
}

.contact-email-primary {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 0.9rem + 0.4vw, 1.25rem);
  font-weight: 600;
  color: var(--link-accent);
  word-break: break-all;
  margin-bottom: 18px;
}

.contact-email-primary:hover {
  color: var(--link-accent-hover);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.contact-routing-note {
  padding-top: 16px;
  border-top: 1px solid var(--border-datum);
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--text-secondary);
  margin: 0;
}

.inline-link {
  color: var(--link-accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.inline-link:hover {
  color: var(--link-accent-hover);
}

/* ==========================================================================
   Site Footer — Legal Entity Identification & Links
   ========================================================================== */
.site-footer {
  padding: 48px 0 56px;
  background-color: var(--bg-footer);
  border-top: 1px solid var(--footer-border);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--footer-border);
}

.site-footer .brand-name {
  color: var(--footer-text);
}

.footer-brand-desc {
  font-size: 14px;
  color: var(--footer-secondary);
  margin: 12px 0 0 0;
  max-width: 42ch;
}

.footer-col-heading {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--footer-text);
  margin: 0 0 12px 0;
}

.footer-link-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  color: var(--footer-secondary);
}

.footer-link:hover {
  color: var(--footer-text);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 24px;
  font-size: 13px;
  color: var(--footer-muted);
}

.footer-bottom p {
  margin: 0;
}

/* ==========================================================================
   Responsive Breakpoints (Desktop -> Tablet -> 390px Mobile)
   ========================================================================== */
@media (max-width: 960px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
    padding: 14px 0;
  }

  .hero-grid,
  .plotmark-intro-grid,
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .screenshots-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 680px) {
  .container {
    padding: 0 18px;
  }

  .header-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 14px 0;
  }

  .header-top-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .header-nav-wrapper {
    flex-wrap: wrap;
    justify-content: space-between;
    border-top: 1px solid var(--header-border);
    padding-top: 8px;
    gap: 6px;
  }

  .site-nav {
    gap: 2px;
    flex-wrap: wrap;
  }

  .nav-link {
    padding: 0 8px;
    font-size: 13px;
  }

  .header-contact-btn {
    margin-left: 0;
    padding: 0 12px;
    font-size: 13px;
  }

  .hero-section {
    padding: 40px 0 48px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn,
  .product-cta-group .btn {
    width: 100%;
  }

  .datum-section {
    padding: 48px 0;
  }

  .product-gallery-wrapper {
    padding: 20px 16px;
  }

  .screenshots-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .screenshot-frame {
    max-width: 300px;
    margin-left: auto;
    margin-right: auto;
  }

  .in-dev-ledger {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .fact-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}