/* ==========================================================================
   LitNumbers.com — Midnight Photometric Lab & Low-Voltage LED Design System
   Namespace: .ln-* / --ln-*
   WCAG 2.1 AA/AAA Verified:
     #f8fafc on #060913 = 19.4:1 | #e2e8f0 on #0c1324 = 14.8:1
     #94a3b8 on #060913 =  7.0:1 | #060913 on #22d3ee = 11.8:1
   ========================================================================== */

:root {
  --ln-bg-midnight: #060913;
  --ln-bg-card: #0c1324;
  --ln-bg-panel: #131d35;
  --ln-bg-elevated: #192642;
  --ln-border: #1e293b;
  --ln-border-strong: #334155;
  --ln-text-primary: #f8fafc;
  --ln-text-secondary: #e2e8f0;
  --ln-text-body: #cbd5e1;
  --ln-text-muted: #94a3b8;
  --ln-accent-cyan: #22d3ee;
  --ln-accent-cyan-hover: #67e8f9;
  --ln-accent-amber: #fbbf24;
  --ln-accent-emerald: #34d399;
  --ln-accent-btn-text: #060913;
  --ln-font-sans: 'Space Grotesk', 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --ln-font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --ln-font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
  --ln-radius-sm: 8px;
  --ln-radius-md: 12px;
  --ln-radius-lg: 18px;
  --ln-max-width: 1220px;
}

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body.ln-theme-body {
  margin: 0;
  padding: 0;
  background-color: var(--ln-bg-midnight);
  color: var(--ln-text-secondary);
  font-family: var(--ln-font-body);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.ln-skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 2000;
  padding: 10px 18px;
  background: var(--ln-accent-cyan);
  color: var(--ln-accent-btn-text);
  font-weight: 700;
  border-radius: var(--ln-radius-sm);
  text-decoration: none;
}

.ln-skip-link:focus {
  left: 12px;
}

.ln-container {
  width: 100%;
  max-width: var(--ln-max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.ln-site-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.ln-main {
  flex: 1 0 auto;
}

/* Typography & Shared Badges */
h1, h2, h3, h4 {
  color: var(--ln-text-primary);
  font-family: var(--ln-font-sans);
  line-height: 1.22;
  margin-top: 0;
}

a {
  color: var(--ln-accent-cyan);
  text-underline-offset: 3px;
}

a:hover {
  color: var(--ln-accent-cyan-hover);
}

.ln-kicker {
  display: inline-block;
  font-family: var(--ln-font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ln-accent-cyan);
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.28);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.ln-mono-tag {
  display: inline-block;
  font-family: var(--ln-font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ln-accent-amber);
}

.ln-icon-cyan {
  color: var(--ln-accent-cyan);
  flex-shrink: 0;
}

.ln-icon-amber {
  color: var(--ln-accent-amber);
  flex-shrink: 0;
}

/* Buttons */
.ln-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 11px 22px;
  border-radius: var(--ln-radius-sm);
  font-family: var(--ln-font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
}

.ln-btn-primary {
  background-color: var(--ln-accent-cyan);
  color: var(--ln-accent-btn-text);
}

.ln-btn-primary:hover {
  background-color: var(--ln-accent-cyan-hover);
  color: var(--ln-accent-btn-text);
  transform: translateY(-1px);
}

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

.ln-btn-secondary:hover {
  border-color: var(--ln-accent-cyan);
  color: var(--ln-accent-cyan);
}

/* Topbar & Header Navigation */
.ln-site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(6, 9, 19, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--ln-border);
}

.ln-spec-topbar {
  background: #04070f;
  border-bottom: 1px solid var(--ln-border);
  font-family: var(--ln-font-mono);
  font-size: 0.74rem;
  color: var(--ln-text-muted);
  padding: 7px 0;
}

.ln-spec-topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.ln-spec-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--ln-text-secondary);
  font-weight: 600;
}

.ln-spec-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.ln-topbar-mail {
  color: var(--ln-accent-cyan);
  text-decoration: none;
  font-weight: 700;
}

.ln-navbar-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 16px;
}

.ln-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.ln-brand-logo {
  border-radius: 10px;
  flex-shrink: 0;
}

.ln-brand-copy {
  display: flex;
  flex-direction: column;
}

.ln-brand-title {
  font-family: var(--ln-font-sans);
  font-size: 1.22rem;
  font-weight: 800;
  color: var(--ln-text-primary);
  letter-spacing: -0.02em;
}

.ln-brand-subtitle {
  font-family: var(--ln-font-mono);
  font-size: 0.7rem;
  color: var(--ln-text-muted);
}

.ln-nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.ln-nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 13px;
  color: var(--ln-text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--ln-radius-sm);
}

.ln-nav-link:hover,
.ln-nav-link.active {
  color: var(--ln-accent-cyan);
  background: rgba(34, 211, 238, 0.08);
}

.ln-nav-cta {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 16px;
  margin-left: 6px;
  background: var(--ln-accent-cyan);
  color: var(--ln-accent-btn-text);
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: var(--ln-radius-sm);
  text-decoration: none;
}

.ln-nav-cta:hover {
  background: var(--ln-accent-cyan-hover);
  color: var(--ln-accent-btn-text);
}

.ln-mobile-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--ln-bg-panel);
  color: var(--ln-text-primary);
  border: 1px solid var(--ln-border-strong);
  border-radius: var(--ln-radius-sm);
  cursor: pointer;
}

.ln-nav-backdrop {
  display: none;
}

/* Sections & Hero */
.ln-hero {
  padding: 56px 0 48px;
  border-bottom: 1px solid var(--ln-border);
  background: radial-gradient(circle at 75% 22%, rgba(34, 211, 238, 0.12), transparent 48%),
              radial-gradient(circle at 20% 80%, rgba(251, 191, 36, 0.08), transparent 45%),
              var(--ln-bg-midnight);
}

.ln-hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 36px;
  align-items: start;
}

.ln-hero-title {
  font-size: clamp(2rem, 3.8vw, 3.05rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 18px;
}

.ln-hero-lead {
  font-size: 1.08rem;
  color: var(--ln-text-secondary);
  margin-bottom: 24px;
  max-width: 62ch;
}

.ln-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.ln-metric-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.ln-metric-card {
  background: var(--ln-bg-card);
  border: 1px solid var(--ln-border);
  border-radius: var(--ln-radius-md);
  padding: 14px;
}

.ln-metric-val {
  display: block;
  font-family: var(--ln-font-mono);
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--ln-accent-cyan);
}

.ln-metric-lbl {
  font-size: 0.8rem;
  color: var(--ln-text-muted);
}

.ln-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--ln-border);
}

.ln-section-alt {
  background: #080d1a;
}

.ln-section-head {
  max-width: 760px;
  margin-bottom: 32px;
}

.ln-section-title {
  font-size: clamp(1.55rem, 2.6vw, 2.2rem);
  margin-bottom: 10px;
}

.ln-section-sub {
  color: var(--ln-text-muted);
  margin: 0;
  font-size: 1.02rem;
}

/* ==========================================================================
   Widget 1: Live Kelvin & Standoff Halo Photometry Studio
   ========================================================================== */
.ln-studio-card {
  background: var(--ln-bg-card);
  border: 1px solid var(--ln-border-strong);
  border-radius: var(--ln-radius-lg);
  padding: 22px;
}

.ln-studio-stage {
  border-radius: var(--ln-radius-md);
  min-height: 210px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px 18px;
  margin-bottom: 18px;
  border: 1px solid var(--ln-border-strong);
  position: relative;
  overflow: hidden;
  transition: background-color 0.25s ease;
}

.ln-studio-stage[data-wall="stucco"] {
  background-color: #2b313d;
}
.ln-studio-stage[data-wall="limestone"] {
  background-color: #262523;
}
.ln-studio-stage[data-wall="brick"] {
  background-color: #2a1816;
}
.ln-studio-stage[data-wall="slate"] {
  background-color: #0b0f19;
}

.ln-halo-digits {
  font-family: var(--ln-font-sans);
  font-size: clamp(3.1rem, 6vw, 4.6rem);
  font-weight: 800;
  letter-spacing: 0.16em;
  color: #090d16;
  padding-left: 0.16em;
  user-select: none;
  transition: text-shadow 0.25s ease, color 0.25s ease;
}

.ln-studio-stage[data-kelvin="2700k"] .ln-halo-digits {
  text-shadow: 0 0 18px rgba(245, 158, 11, 0.95), 0 0 42px rgba(245, 158, 11, 0.65);
}
.ln-studio-stage[data-kelvin="3000k"] .ln-halo-digits {
  text-shadow: 0 0 18px rgba(253, 224, 71, 0.95), 0 0 42px rgba(251, 191, 36, 0.62);
}
.ln-studio-stage[data-kelvin="4000k"] .ln-halo-digits {
  text-shadow: 0 0 18px rgba(224, 242, 254, 0.96), 0 0 42px rgba(186, 230, 253, 0.62);
}
.ln-studio-stage[data-kelvin="5000k"] .ln-halo-digits {
  text-shadow: 0 0 18px rgba(34, 211, 238, 0.96), 0 0 44px rgba(34, 211, 238, 0.66);
}
.ln-studio-stage[data-kelvin="solar"] .ln-halo-digits {
  text-shadow: 0 0 14px rgba(52, 211, 153, 0.9), 0 0 32px rgba(253, 224, 71, 0.52);
}

.ln-studio-stage[data-standoff="050"] .ln-halo-digits {
  letter-spacing: 0.12em;
}
.ln-studio-stage[data-standoff="100"] .ln-halo-digits {
  letter-spacing: 0.22em;
}

.ln-stage-telemetry {
  margin-top: 14px;
  font-family: var(--ln-font-mono);
  font-size: 0.76rem;
  color: var(--ln-text-primary);
  background: rgba(6, 9, 19, 0.84);
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--ln-border-strong);
  text-align: center;
}

.ln-form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.ln-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ln-field label {
  font-family: var(--ln-font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ln-text-secondary);
}

.ln-input,
.ln-select {
  min-height: 44px;
  padding: 8px 12px;
  border-radius: var(--ln-radius-sm);
  border: 1px solid var(--ln-border-strong);
  background: var(--ln-bg-panel);
  color: var(--ln-text-primary);
  font-family: var(--ln-font-body);
  font-size: 0.94rem;
}

.ln-input:focus,
.ln-select:focus {
  outline: 2px solid var(--ln-accent-cyan);
  outline-offset: 1px;
}

.ln-studio-readout {
  margin-top: 14px;
  padding: 12px 14px;
  background: var(--ln-bg-panel);
  border-left: 3px solid var(--ln-accent-cyan);
  border-radius: var(--ln-radius-sm);
  font-size: 0.88rem;
  color: var(--ln-text-secondary);
}

/* ==========================================================================
   Widget 2: 4-Layer Engineering Stack Tablist
   ========================================================================== */
.ln-tabs-shell {
  background: var(--ln-bg-card);
  border: 1px solid var(--ln-border);
  border-radius: var(--ln-radius-lg);
  padding: 24px;
}

.ln-tablist {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 22px;
}

.ln-tab-btn {
  min-height: 48px;
  padding: 10px 14px;
  background: var(--ln-bg-panel);
  color: var(--ln-text-secondary);
  border: 1px solid var(--ln-border-strong);
  border-radius: var(--ln-radius-sm);
  font-family: var(--ln-font-sans);
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  text-align: left;
}

.ln-tab-btn[aria-selected="true"] {
  background: rgba(34, 211, 238, 0.14);
  color: var(--ln-accent-cyan);
  border-color: var(--ln-accent-cyan);
}

.ln-tabpanel[hidden] {
  display: none;
}

.ln-tabpanel-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
  align-items: center;
}

.ln-spec-kv {
  background: var(--ln-bg-panel);
  border: 1px solid var(--ln-border);
  border-radius: var(--ln-radius-md);
  padding: 18px;
}

.ln-spec-kv-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--ln-border);
  font-size: 0.9rem;
}

.ln-spec-kv-row:last-child {
  border-bottom: none;
}

.ln-spec-kv-row strong {
  color: var(--ln-accent-amber);
  font-family: var(--ln-font-mono);
}

/* ==========================================================================
   Widget 3 & Widget 4: Dual Interactive Calculators
   ========================================================================== */
.ln-calc-dual-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.ln-console-card {
  background: var(--ln-bg-card);
  border: 1px solid var(--ln-border-strong);
  border-radius: var(--ln-radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ln-range-input {
  width: 100%;
  min-height: 44px;
  accent-color: var(--ln-accent-cyan);
  cursor: pointer;
}

.ln-output-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.ln-output-box {
  background: var(--ln-bg-panel);
  border: 1px solid var(--ln-border);
  border-radius: var(--ln-radius-sm);
  padding: 12px;
}

.ln-output-label {
  display: block;
  font-family: var(--ln-font-mono);
  font-size: 0.72rem;
  color: var(--ln-text-muted);
  text-transform: uppercase;
}

.ln-output-val {
  display: block;
  font-family: var(--ln-font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ln-accent-emerald);
  margin-top: 4px;
}

.ln-spec-pre {
  background: #04070f;
  border: 1px solid var(--ln-border);
  border-radius: var(--ln-radius-sm);
  padding: 12px;
  font-family: var(--ln-font-mono);
  font-size: 0.78rem;
  color: var(--ln-text-secondary);
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0;
}

/* Cards, Articles & Catalog Grids */
.ln-cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.ln-cards-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.ln-card {
  background: var(--ln-bg-card);
  border: 1px solid var(--ln-border);
  border-radius: var(--ln-radius-md);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ln-card-img {
  width: 100%;
  height: auto;
  border-radius: var(--ln-radius-sm);
  border: 1px solid var(--ln-border);
}

.ln-card-title {
  font-size: 1.2rem;
  margin: 0;
}

.ln-card-title a {
  color: var(--ln-text-primary);
  text-decoration: none;
}

.ln-card-title a:hover {
  color: var(--ln-accent-cyan);
}

/* Content + Sidebar Layout */
.ln-page-hero,
.ln-article-banner {
  padding: 44px 0 36px;
  background: #080d1a;
  border-bottom: 1px solid var(--ln-border);
}

.ln-page-title,
.ln-article-title {
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  margin-bottom: 12px;
}

.ln-page-lead {
  font-size: 1.06rem;
  color: var(--ln-text-secondary);
  max-width: 68ch;
  margin: 0;
}

.ln-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--ln-font-mono);
  font-size: 0.78rem;
  color: var(--ln-text-muted);
  margin-bottom: 14px;
}

.ln-article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  font-size: 0.88rem;
  color: var(--ln-text-muted);
}

.ln-content-with-sidebar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 36px;
  align-items: start;
}

.ln-article-figure,
.ln-figure {
  margin: 0 0 26px;
}

.ln-article-hero-img,
.ln-diagram {
  width: 100%;
  height: auto;
  border-radius: var(--ln-radius-md);
  border: 1px solid var(--ln-border-strong);
  display: block;
}

.ln-figure figcaption {
  font-family: var(--ln-font-mono);
  font-size: 0.78rem;
  color: var(--ln-text-muted);
  margin-top: 8px;
}

.ln-toc-box {
  background: var(--ln-bg-card);
  border: 1px solid var(--ln-border-strong);
  border-radius: var(--ln-radius-md);
  padding: 18px 20px;
  margin-bottom: 26px;
}

.ln-toc-list {
  margin: 10px 0 0;
  padding-left: 20px;
  display: grid;
  gap: 6px;
}

.ln-toc-sub {
  margin-left: 16px;
}

.ln-prose h2 {
  font-size: 1.5rem;
  margin-top: 32px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--ln-border);
}

.ln-prose h3 {
  font-size: 1.2rem;
  margin-top: 24px;
  margin-bottom: 10px;
}

.ln-prose p,
.ln-prose li {
  color: var(--ln-text-secondary);
  font-size: 1.02rem;
}

.ln-lead {
  font-size: 1.12rem;
  color: var(--ln-text-primary);
  font-weight: 500;
}

.ln-callout {
  background: var(--ln-bg-panel);
  border-left: 4px solid var(--ln-accent-amber);
  padding: 16px 18px;
  border-radius: var(--ln-radius-sm);
  margin: 22px 0;
}

.ln-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 22px 0;
  border: 1px solid var(--ln-border-strong);
  border-radius: var(--ln-radius-sm);
}

.ln-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 580px;
  font-size: 0.92rem;
}

.ln-table th,
.ln-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--ln-border);
}

.ln-table th {
  background: var(--ln-bg-panel);
  color: var(--ln-accent-cyan);
  font-family: var(--ln-font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
}

.ln-article-endbox,
.ln-contact-form-panel,
.ln-sidebar-card {
  background: var(--ln-bg-card);
  border: 1px solid var(--ln-border-strong);
  border-radius: var(--ln-radius-md);
  padding: 22px;
}

.ln-article-endbox {
  margin-top: 32px;
}

.ln-inline-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 14px;
}

.ln-sidebar {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.ln-sidebar-list {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
  display: grid;
  gap: 10px;
}

.ln-sidebar-list a {
  color: var(--ln-text-secondary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.93rem;
}

.ln-sidebar-list a:hover {
  color: var(--ln-accent-cyan);
}

.ln-contact-cards-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-bottom: 24px;
}

.ln-check-bullets {
  padding-left: 18px;
  margin: 10px 0 0;
  display: grid;
  gap: 6px;
}

/* Footer */
.ln-footer {
  background: #04070f;
  border-top: 1px solid var(--ln-border);
  margin-top: 48px;
}

.ln-footer-specbar {
  background: var(--ln-bg-card);
  border-bottom: 1px solid var(--ln-border);
  padding: 12px 0;
  font-family: var(--ln-font-mono);
  font-size: 0.76rem;
  color: var(--ln-text-muted);
}

.ln-footer-specbar-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
}

.ln-footer-specbar strong {
  color: var(--ln-accent-cyan);
}

.ln-footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 28px;
  padding: 44px 20px 32px;
}

.ln-footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.ln-footer-brand-name {
  font-family: var(--ln-font-sans);
  font-size: 1.18rem;
  font-weight: 800;
  color: var(--ln-text-primary);
}

.ln-footer-desc {
  font-size: 0.9rem;
  color: var(--ln-text-muted);
}

.ln-footer-heading {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ln-text-primary);
  margin-bottom: 14px;
}

.ln-footer-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.ln-footer-link {
  color: var(--ln-text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
}

.ln-footer-link:hover {
  color: var(--ln-accent-cyan);
}

.ln-footer-disclosures {
  border-top: 1px solid var(--ln-border);
  padding: 20px;
  font-size: 0.82rem;
  color: var(--ln-text-muted);
}

.ln-footer-bottom {
  border-top: 1px solid var(--ln-border);
  padding: 18px 20px 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--ln-text-muted);
}

.ln-footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* Responsive Breakpoints (1200px, 768px, 320px) */
@media (max-width: 1040px) {
  .ln-hero-grid,
  .ln-calc-dual-grid,
  .ln-tabpanel-grid,
  .ln-content-with-sidebar {
    grid-template-columns: 1fr;
  }

  .ln-cards-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .ln-footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 820px) {
  .ln-mobile-toggle {
    display: inline-flex;
  }

  .ln-nav {
    position: fixed;
    top: 0;
    right: -300px;
    width: 280px;
    height: 100vh;
    background: var(--ln-bg-card);
    border-left: 1px solid var(--ln-border-strong);
    padding: 24px 18px;
    transition: right 0.22s ease;
    z-index: 1200;
    overflow-y: auto;
  }

  .ln-nav.is-open {
    right: 0;
  }

  .ln-nav-list {
    flex-direction: column;
    align-items: stretch;
  }

  .ln-nav-cta {
    margin-left: 0;
    margin-top: 8px;
    justify-content: center;
  }

  .ln-nav-backdrop.is-open {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    z-index: 1100;
  }

  .ln-tablist {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .ln-metric-strip,
  .ln-form-grid,
  .ln-output-grid,
  .ln-cards-grid-3,
  .ln-cards-grid-2,
  .ln-contact-cards-row,
  .ln-tablist,
  .ln-footer-grid {
    grid-template-columns: 1fr;
  }
}

/* Articles Filter Bar & Screen-Reader Utility */
.ln-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.ln-filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px;
  margin-bottom: 24px;
  background: var(--ln-bg-card);
  border: 1px solid var(--ln-border);
  border-radius: var(--ln-radius-md);
}

.ln-search-box {
  flex: 1 1 260px;
}

.ln-chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ln-chip {
  min-height: 38px;
  padding: 6px 14px;
  background: var(--ln-bg-panel);
  color: var(--ln-text-secondary);
  border: 1px solid var(--ln-border-strong);
  border-radius: 999px;
  font-family: var(--ln-font-sans);
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
}

.ln-chip:hover {
  border-color: var(--ln-accent-cyan);
  color: var(--ln-accent-cyan);
}

.ln-chip.is-active {
  background: var(--ln-accent-cyan);
  color: var(--ln-accent-btn-text);
  border-color: var(--ln-accent-cyan);
  font-weight: 700;
}