/* ==========================================================================
   HouseSignage.com — Architectural Wayfinding, Dusk Illumination & Night-Contrast
   Scoped Stylesheet (WCAG 2.1 AA/AAA Verified)
   ========================================================================== */

:root {
  --hs-bg: #070b14;
  --hs-surface: #0f172a;
  --hs-panel: #162033;
  --hs-panel-hover: #1e293b;
  --hs-border: #1e293b;
  --hs-border-strong: #334155;
  --hs-text: #f8fafc;
  --hs-text-sec: #e2e8f0;
  --hs-text-body: #cbd5e1;
  --hs-text-muted: #94a3b8;
  --hs-brass: #f59e0b;
  --hs-brass-hover: #fbbf24;
  --hs-brass-ink: #070b14;
  --hs-sky: #38bdf8;
  --hs-reflective: #34d399;
  --hs-font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --hs-font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
  --hs-radius-sm: 6px;
  --hs-radius-md: 10px;
  --hs-radius-lg: 14px;
  --hs-shadow-lg: 0 20px 45px rgba(2, 6, 23, 0.55);
}

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

html {
  scroll-behavior: smooth;
}

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

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

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

.hs-container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.hs-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;
}

.hs-skip-link {
  position: absolute;
  left: -9999px;
  top: 0.5rem;
  z-index: 999;
  background: var(--hs-brass);
  color: var(--hs-brass-ink);
  font-weight: 700;
  padding: 0.65rem 1rem;
  border-radius: var(--hs-radius-sm);
  text-decoration: none;
}

.hs-skip-link:focus {
  left: 0.75rem;
}

a {
  color: var(--hs-sky);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--hs-brass-hover);
}

:focus-visible {
  outline: 2px solid var(--hs-brass);
  outline-offset: 2px;
}

h1, h2, h3, h4 {
  color: var(--hs-text);
  font-family: var(--hs-font-sans);
  line-height: 1.22;
  margin-top: 0;
}

code {
  font-family: var(--hs-font-mono);
  font-size: 0.88em;
  background: rgba(56, 189, 248, 0.1);
  color: var(--hs-text-sec);
  border: 1px solid rgba(56, 189, 248, 0.22);
  border-radius: 4px;
  padding: 0.12rem 0.38rem;
}

td code {
  white-space: nowrap;
}

.hs-icon-brass {
  color: var(--hs-brass);
  flex-shrink: 0;
}

.hs-icon-sky {
  color: var(--hs-sky);
  flex-shrink: 0;
}

/* ==========================================================================
   Buttons & Interactive Chips (44px Min Touch Targets)
   ========================================================================== */

.hs-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.72rem 1.35rem;
  border-radius: var(--hs-radius-sm);
  font-family: var(--hs-font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease, transform 0.15s ease;
  border: 1px solid transparent;
}

.hs-btn-primary {
  background-color: var(--hs-brass);
  color: var(--hs-brass-ink);
  border-color: var(--hs-brass);
}

.hs-btn-primary:hover {
  background-color: var(--hs-brass-hover);
  border-color: var(--hs-brass-hover);
  color: var(--hs-brass-ink);
}

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

.hs-btn-secondary:hover {
  background-color: var(--hs-panel-hover);
  border-color: var(--hs-brass);
  color: var(--hs-text);
}

.hs-btn-block {
  width: 100%;
}

.hs-chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.hs-chip {
  min-height: 44px;
  padding: 0.5rem 0.9rem;
  background: var(--hs-surface);
  color: var(--hs-text-sec);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-sm);
  font-family: var(--hs-font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.16s ease;
}

.hs-chip:hover {
  border-color: var(--hs-brass);
  color: var(--hs-text);
}

.hs-chip.is-active {
  background: var(--hs-brass);
  color: var(--hs-brass-ink);
  border-color: var(--hs-brass);
  font-weight: 700;
}

/* ==========================================================================
   Header, Spec Strip & Responsive Drawer Navigation
   ========================================================================== */

.hs-site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 11, 20, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--hs-border);
}

.hs-spec-topbar {
  background: #04070e;
  border-bottom: 1px solid var(--hs-border);
  font-family: var(--hs-font-mono);
  font-size: 0.74rem;
  color: var(--hs-text-muted);
  padding: 0.4rem 0;
}

.hs-spec-topbar-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.hs-spec-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--hs-text-sec);
  font-weight: 600;
}

.hs-spec-meta {
  display: none;
  align-items: center;
  gap: 0.6rem;
}

.hs-topbar-mail {
  color: var(--hs-brass-hover);
  text-decoration: none;
}

.hs-navbar-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 1rem;
}

.hs-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.hs-brand-logo {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  flex-shrink: 0;
}

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

.hs-brand-title {
  color: var(--hs-text);
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hs-brand-subtitle {
  color: var(--hs-text-muted);
  font-size: 0.73rem;
  font-family: var(--hs-font-mono);
}

.hs-mobile-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--hs-panel);
  color: var(--hs-text);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-sm);
  cursor: pointer;
}

.hs-nav {
  position: fixed;
  top: 73px;
  right: 0;
  width: min(320px, 88vw);
  height: calc(100vh - 73px);
  background: var(--hs-surface);
  border-left: 1px solid var(--hs-border-strong);
  padding: 1.25rem;
  transform: translateX(105%);
  transition: transform 0.22s ease;
  z-index: 110;
  overflow-y: auto;
}

.hs-nav.is-open {
  transform: translateX(0);
}

.hs-nav-backdrop {
  display: none;
  position: fixed;
  inset: 73px 0 0 0;
  background: rgba(2, 6, 23, 0.7);
  z-index: 105;
}

.hs-nav-backdrop.is-open {
  display: block;
}

.hs-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.hs-nav-link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0.5rem 0.75rem;
  color: var(--hs-text-sec);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.94rem;
  border-radius: var(--hs-radius-sm);
}

.hs-nav-link:hover,
.hs-nav-link.active {
  color: var(--hs-text);
  background: rgba(245, 158, 11, 0.12);
}

.hs-nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.55rem 1rem;
  background: var(--hs-brass);
  color: var(--hs-brass-ink);
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: var(--hs-radius-sm);
  text-decoration: none;
}

.hs-nav-cta:hover {
  background: var(--hs-brass-hover);
  color: var(--hs-brass-ink);
}

/* ==========================================================================
   Hero & Section Architecture
   ========================================================================== */

.hs-hero {
  padding: 3rem 0 3.5rem;
  background:
    radial-gradient(circle at 82% 22%, rgba(245, 158, 11, 0.14), transparent 44%),
    radial-gradient(circle at 18% 80%, rgba(56, 189, 248, 0.08), transparent 42%),
    var(--hs-bg);
  border-bottom: 1px solid var(--hs-border);
}

.hs-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
  align-items: center;
}

.hs-eyebrow,
.hs-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--hs-font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--hs-brass-hover);
  margin-bottom: 0.75rem;
}

.hs-hero-title {
  font-size: clamp(1.95rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 1rem;
}

.hs-hero-lead {
  font-size: 1.08rem;
  color: var(--hs-text-sec);
  margin-bottom: 1.5rem;
  max-width: 65ch;
}

.hs-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-bottom: 1.85rem;
}

.hs-hero-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(155px, 1fr));
  gap: 0.85rem;
  margin: 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--hs-border);
}

.hs-metric-item dt {
  font-family: var(--hs-font-mono);
  font-size: 0.73rem;
  text-transform: uppercase;
  color: var(--hs-text-muted);
}

.hs-metric-item dd {
  margin: 0.2rem 0 0;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--hs-text);
}

.hs-schematic-frame {
  background: var(--hs-surface);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-lg);
  padding: 1rem;
  box-shadow: var(--hs-shadow-lg);
}

.hs-schematic-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  gap: 0.5rem;
}

.hs-mono-tag {
  display: inline-block;
  font-family: var(--hs-font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--hs-sky);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
}

.hs-mono-status {
  font-family: var(--hs-font-mono);
  font-size: 0.74rem;
  color: var(--hs-brass-hover);
}

.hs-schematic-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--hs-radius-sm);
  background: #050912;
}

.hs-schematic-caption {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
  font-family: var(--hs-font-mono);
  font-size: 0.75rem;
  color: var(--hs-text-muted);
}

.hs-section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--hs-border);
}

.hs-section-alt {
  background-color: #0a101f;
}

.hs-section-intro {
  max-width: 780px;
  margin: 0 auto 2.25rem;
  text-align: center;
}

.hs-section-intro.hs-intro-left {
  margin-left: 0;
  text-align: left;
}

.hs-section-title {
  font-size: clamp(1.55rem, 3vw, 2.2rem);
  margin-bottom: 0.75rem;
}

.hs-section-desc {
  color: var(--hs-text-body);
  margin: 0;
  font-size: 1.02rem;
}

/* ==========================================================================
   Widget 1: Live Day/Night Facade & Backlit Halo Simulator
   ========================================================================== */

.hs-simulator-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  background: var(--hs-surface);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-lg);
  padding: 1.35rem;
}

.hs-control-group {
  margin-bottom: 1.15rem;
}

.hs-control-group:last-child {
  margin-bottom: 0;
}

.hs-control-label {
  display: block;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--hs-text);
  margin-bottom: 0.5rem;
}

.hs-text-input,
.hs-select {
  width: 100%;
  min-height: 46px;
  padding: 0.65rem 0.9rem;
  background: var(--hs-bg);
  color: var(--hs-text);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-sm);
  font-family: var(--hs-font-sans);
  font-size: 1rem;
}

.hs-field-hint {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.8rem;
  color: var(--hs-text-muted);
}

.hs-simulator-preview-wrap {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.hs-sim-stage {
  min-height: 290px;
  border-radius: var(--hs-radius-md);
  border: 1px solid var(--hs-border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

/* Cladding Textures */
.hs-sim-stage.wall-stucco {
  background:
    radial-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 0) 0 0 / 8px 8px,
    linear-gradient(160deg, #1e293b 0%, #0f172a 100%);
}

.hs-sim-stage.wall-stucco.light-daylight {
  background:
    radial-gradient(rgba(15, 23, 42, 0.05) 1px, transparent 0) 0 0 / 8px 8px,
    linear-gradient(160deg, #e2e8f0 0%, #cbd5e1 100%);
}

.hs-sim-stage.wall-brick {
  background:
    repeating-linear-gradient(0deg, rgba(15, 23, 42, 0.45) 0 3px, transparent 3px 32px),
    repeating-linear-gradient(90deg, rgba(15, 23, 42, 0.35) 0 3px, transparent 3px 74px),
    linear-gradient(145deg, #5c241b 0%, #38140e 100%);
}

.hs-sim-stage.wall-cedar {
  background:
    repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.32) 0 2px, transparent 2px 38px),
    linear-gradient(135deg, #6b3e22 0%, #3e2211 100%);
}

.hs-sim-stage.wall-charcoal {
  background:
    repeating-linear-gradient(90deg, rgba(0, 0, 0, 0.45) 0 4px, transparent 4px 56px),
    linear-gradient(160deg, #18202c 0%, #0b0f17 100%);
}

.hs-sim-plaque-frame {
  padding: 1.35rem 2.25rem;
  border-radius: 8px;
  transition: all 0.25s ease;
}

.hs-sim-digits {
  font-family: var(--hs-font-sans);
  font-size: clamp(3.3rem, 8vw, 5.4rem);
  font-weight: 800;
  letter-spacing: 0.14em;
  line-height: 1;
  display: inline-block;
  transition: color 0.22s ease, text-shadow 0.22s ease;
}

/* Finishes */
.hs-sim-stage.finish-matte-black .hs-sim-digits {
  color: #090d16;
}
.hs-sim-stage.finish-brushed-brass .hs-sim-digits {
  color: #d99b26;
}
.hs-sim-stage.finish-marine-stainless .hs-sim-digits {
  color: #dbe4ee;
}
.hs-sim-stage.finish-corten .hs-sim-digits {
  color: #a84d28;
}

/* Lighting / Optical States */
.hs-sim-stage.light-daylight .hs-sim-digits {
  text-shadow: 5px 8px 10px rgba(0, 0, 0, 0.48);
}

.hs-sim-stage.light-halo-3000k .hs-sim-digits {
  text-shadow:
    0 0 12px rgba(251, 191, 36, 0.95),
    0 0 28px rgba(245, 158, 11, 0.85),
    0 0 58px rgba(245, 158, 11, 0.55);
}

.hs-sim-stage.light-halo-5000k .hs-sim-digits {
  text-shadow:
    0 0 12px rgba(240, 249, 255, 0.95),
    0 0 28px rgba(56, 189, 248, 0.85),
    0 0 58px rgba(56, 189, 248, 0.55);
}

.hs-sim-stage.light-solar-plaque .hs-sim-plaque-frame {
  background: radial-gradient(circle, #fef3c7 0%, #fde68a 100%);
  border: 5px solid #0f172a;
  box-shadow: 0 0 38px rgba(253, 230, 138, 0.55);
}

.hs-sim-stage.light-solar-plaque .hs-sim-digits {
  color: #070b14;
  text-shadow: none;
}

.hs-sim-stage.light-reflective-911 .hs-sim-plaque-frame {
  background: linear-gradient(135deg, #065f46 0%, #047857 100%);
  border: 4px solid #ecfdf5;
  box-shadow: 0 0 36px rgba(52, 211, 153, 0.65);
}

.hs-sim-stage.light-reflective-911 .hs-sim-digits {
  color: #ffffff;
  text-shadow: 0 0 14px rgba(255, 255, 255, 0.85);
}

.hs-sim-telemetry {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(175px, 1fr));
  gap: 0.75rem;
}

.hs-telemetry-cell {
  background: var(--hs-bg);
  border: 1px solid var(--hs-border);
  border-radius: var(--hs-radius-sm);
  padding: 0.75rem 0.9rem;
}

.hs-telemetry-label {
  display: block;
  font-family: var(--hs-font-mono);
  font-size: 0.7rem;
  color: var(--hs-text-muted);
  margin-bottom: 0.25rem;
}

.hs-telemetry-cell strong {
  color: var(--hs-text);
  font-size: 0.88rem;
}

/* ==========================================================================
   Widget 2: 4-Tier Specification Explorer (WAI-ARIA Tabs)
   ========================================================================== */

.hs-tabs-shell {
  background: var(--hs-surface);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-lg);
  overflow: hidden;
}

.hs-tablist {
  display: grid;
  grid-template-columns: 1fr;
  background: #060a13;
  border-bottom: 1px solid var(--hs-border-strong);
}

.hs-tab-btn {
  min-height: 50px;
  padding: 0.85rem 1rem;
  background: transparent;
  color: var(--hs-text-muted);
  border: 0;
  border-bottom: 2px solid transparent;
  font-family: var(--hs-font-sans);
  font-size: 0.92rem;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  transition: all 0.16s ease;
}

.hs-tab-btn:hover {
  color: var(--hs-text);
  background: rgba(255, 255, 255, 0.03);
}

.hs-tab-btn.is-active {
  color: var(--hs-brass-hover);
  background: var(--hs-surface);
  border-bottom-color: var(--hs-brass);
}

.hs-tabpanel {
  padding: 1.65rem;
}

.hs-panel-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: center;
}

.hs-check-bullets {
  padding-left: 1.2rem;
  margin: 1rem 0 0;
}

.hs-check-bullets li {
  margin-bottom: 0.55rem;
  color: var(--hs-text-body);
}

.hs-panel-specbox {
  background: var(--hs-bg);
  border: 1px solid var(--hs-border);
  border-radius: var(--hs-radius-md);
  padding: 1rem;
}

.hs-panel-diagram {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--hs-radius-sm);
}

/* ==========================================================================
   Tables (.table-responsive)
   ========================================================================== */

.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0.75rem 0;
}

.hs-spec-table,
.hs-prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.hs-spec-table th,
.hs-spec-table td,
.hs-prose th,
.hs-prose td {
  padding: 0.7rem 0.85rem;
  border-bottom: 1px solid var(--hs-border-strong);
  text-align: left;
}

.hs-spec-table th,
.hs-prose th {
  font-family: var(--hs-font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  color: var(--hs-brass-hover);
  background: rgba(15, 23, 42, 0.85);
}

/* ==========================================================================
   Widgets 3 & 4: Substrate Console & Setback Estimator
   ========================================================================== */

.hs-dual-tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

.hs-tool-card {
  background: var(--hs-surface);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

.hs-tool-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hs-tool-header .hs-kicker {
  margin-bottom: 0;
}

.hs-tool-title {
  font-size: 1.38rem;
  margin: 0.55rem 0 0.5rem;
}

.hs-tool-desc {
  color: var(--hs-text-body);
  font-size: 0.95rem;
  margin-top: 0;
  margin-bottom: 1.2rem;
}

.hs-console-readout {
  margin: 1.25rem 0;
  background: var(--hs-bg);
  border: 1px solid var(--hs-border);
  border-radius: var(--hs-radius-md);
  padding: 1rem;
}

.hs-console-row {
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--hs-border);
}

.hs-console-row:last-child {
  border-bottom: 0;
}

.hs-console-row dt {
  font-family: var(--hs-font-mono);
  font-size: 0.72rem;
  color: var(--hs-brass-hover);
  margin-bottom: 0.2rem;
}

.hs-console-row dd {
  margin: 0;
  color: var(--hs-text-sec);
  font-size: 0.9rem;
}

.hs-console-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
  margin-top: auto;
}

.hs-copy-status {
  font-family: var(--hs-font-mono);
  font-size: 0.8rem;
  color: var(--hs-reflective);
}

.hs-slider-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.hs-mono-value {
  font-family: var(--hs-font-mono);
  font-size: 1.05rem;
  color: var(--hs-brass-hover);
}

.hs-range-slider {
  width: 100%;
  height: 44px;
  accent-color: var(--hs-brass);
  cursor: pointer;
}

.hs-range-ticks {
  display: flex;
  justify-content: space-between;
  font-family: var(--hs-font-mono);
  font-size: 0.72rem;
  color: var(--hs-text-muted);
}

.hs-estimator-selects {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
  margin-top: 1rem;
}

.hs-estimator-results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(135px, 1fr));
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.hs-result-box {
  background: var(--hs-bg);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-sm);
  padding: 0.85rem;
}

.hs-result-label {
  display: block;
  font-family: var(--hs-font-mono);
  font-size: 0.69rem;
  color: var(--hs-text-muted);
  margin-bottom: 0.25rem;
}

.hs-result-figure {
  color: var(--hs-brass-hover);
  font-family: var(--hs-font-mono);
  font-size: 1.05rem;
}

.hs-estimator-note {
  margin: 1rem 0 0;
  padding: 0.8rem 0.95rem;
  background: rgba(56, 189, 248, 0.08);
  border-left: 3px solid var(--hs-sky);
  border-radius: 4px;
  font-size: 0.88rem;
  color: var(--hs-text-sec);
}

/* ==========================================================================
   System Cards, Guide Cards & Sidebar Two-Column Layout
   ========================================================================== */

.hs-systems-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.hs-system-card {
  background: var(--hs-surface);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-md);
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
}

.hs-system-badge {
  font-family: var(--hs-font-mono);
  font-size: 0.72rem;
  color: var(--hs-brass-hover);
  margin-bottom: 0.55rem;
}

.hs-system-card h3 {
  font-size: 1.18rem;
  margin-bottom: 0.55rem;
}

.hs-system-card p {
  color: var(--hs-text-body);
  font-size: 0.94rem;
  margin-top: 0;
  margin-bottom: 1.1rem;
  flex: 1;
}

.hs-card-link {
  font-weight: 700;
  color: var(--hs-brass-hover);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.hs-card-link:hover {
  text-decoration: underline;
}

.hs-content-with-sidebar {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
  align-items: start;
}

.hs-guide-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.hs-guide-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.15rem;
  background: var(--hs-surface);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-md);
  padding: 1.2rem;
}

.hs-guide-thumb {
  width: 100%;
  height: auto;
  border-radius: var(--hs-radius-sm);
  background: #050912;
  display: block;
}

.hs-guide-title {
  font-size: 1.2rem;
  margin: 0.5rem 0;
}

.hs-guide-title a {
  color: var(--hs-text);
  text-decoration: none;
}

.hs-guide-title a:hover {
  color: var(--hs-brass-hover);
}

.hs-guide-excerpt {
  margin: 0 0 0.65rem;
  font-size: 0.94rem;
}

.hs-cta-banner {
  margin-top: 2rem;
  background: linear-gradient(135deg, #162033 0%, #0f172a 100%);
  border: 1px solid var(--hs-brass);
  border-radius: var(--hs-radius-lg);
  padding: 1.6rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

.hs-cta-banner-copy {
  max-width: 600px;
}

.hs-cta-banner-copy h3 {
  margin-bottom: 0.45rem;
}

.hs-cta-banner-copy p {
  margin: 0;
}

/* ==========================================================================
   Sidebar
   ========================================================================== */

.hs-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.hs-sidebar-card {
  background: var(--hs-surface);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-md);
  padding: 1.35rem;
}

.hs-sidebar-cta-card {
  border-color: rgba(245, 158, 11, 0.5);
}

.hs-sidebar-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--hs-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--hs-text-muted);
  margin-bottom: 0.55rem;
}

.hs-sidebar-title {
  font-size: 1.1rem;
  margin-bottom: 0.6rem;
}

.hs-sidebar-copy {
  font-size: 0.92rem;
  margin-top: 0;
  margin-bottom: 1rem;
}

.hs-sidebar-note {
  font-size: 0.83rem;
  color: var(--hs-text-muted);
  margin: 0.75rem 0 0;
}

.hs-spec-checklist {
  list-style: none;
  padding: 0;
  margin: 0;
}

.hs-spec-checklist li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--hs-border);
  font-size: 0.88rem;
}

.hs-spec-checklist li:last-child {
  border-bottom: 0;
}

.hs-sidebar-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.hs-sidebar-links li {
  border-bottom: 1px solid var(--hs-border);
}

.hs-sidebar-links li:last-child {
  border-bottom: 0;
}

.hs-sidebar-link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0.45rem 0;
  color: var(--hs-text-sec);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}

.hs-sidebar-link:hover {
  color: var(--hs-brass-hover);
}

/* ==========================================================================
   Inner Pages: Services, Articles Index, Article Prose & Contact
   ========================================================================== */

.hs-page-hero,
.hs-article-banner {
  padding: 2.75rem 0 2.25rem;
  background: #0a101f;
  border-bottom: 1px solid var(--hs-border);
}

.hs-page-title,
.hs-article-title {
  font-size: clamp(1.75rem, 3.4vw, 2.55rem);
  margin-bottom: 0.75rem;
}

.hs-page-lead {
  font-size: 1.05rem;
  color: var(--hs-text-sec);
  max-width: 68ch;
  margin: 0;
}

.hs-catalog-block {
  background: var(--hs-surface);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-md);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.hs-catalog-header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.hs-catalog-header h2 {
  font-size: 1.32rem;
  margin: 0.35rem 0 0;
}

.hs-inline-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.25rem;
}

.hs-filter-bar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background: var(--hs-surface);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-md);
  padding: 1.25rem;
  margin-bottom: 2rem;
}

.hs-articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.hs-article-grid-card {
  background: var(--hs-surface);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.hs-article-card-img {
  width: 100%;
  height: auto;
  display: block;
  background: #050912;
}

.hs-article-card-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.hs-article-card-title {
  font-size: 1.18rem;
  margin: 0.6rem 0;
}

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

.hs-article-card-title a:hover {
  color: var(--hs-brass-hover);
}

.hs-article-card-excerpt {
  font-size: 0.93rem;
  margin: 0 0 0.85rem;
  flex: 1;
}

.hs-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  font-size: 0.85rem;
  color: var(--hs-text-muted);
  margin-bottom: 0.85rem;
}

.hs-breadcrumb a {
  color: var(--hs-text-sec);
  text-decoration: none;
}

.hs-article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.88rem;
  color: var(--hs-text-muted);
}

.hs-article-main {
  background: var(--hs-surface);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-lg);
  padding: 1.5rem;
}

.hs-article-figure {
  margin: 0 0 1.5rem;
}

.hs-article-hero-img {
  width: 100%;
  height: auto;
  border-radius: var(--hs-radius-md);
  background: #050912;
  display: block;
}

.hs-toc-box {
  background: var(--hs-bg);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-md);
  padding: 1.1rem 1.25rem;
  margin-bottom: 1.75rem;
}

.hs-toc-list {
  margin: 0.65rem 0 0;
  padding-left: 1.25rem;
}

.hs-toc-item {
  margin-bottom: 0.35rem;
  font-size: 0.92rem;
}

.hs-toc-sub {
  margin-left: 1rem;
  font-size: 0.86rem;
}

.hs-prose h2 {
  font-size: 1.48rem;
  margin-top: 2.1rem;
  margin-bottom: 0.75rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--hs-border);
}

.hs-prose h3 {
  font-size: 1.18rem;
  margin-top: 1.5rem;
  margin-bottom: 0.55rem;
}

.hs-prose p,
.hs-prose li {
  color: var(--hs-text-body);
  font-size: 1rem;
}

.hs-prose ul,
.hs-prose ol {
  padding-left: 1.35rem;
}

.hs-prose img {
  max-width: 100%;
  height: auto;
  border-radius: var(--hs-radius-sm);
}

.hs-article-endbox {
  margin-top: 2.25rem;
  padding: 1.35rem;
  background: var(--hs-bg);
  border: 1px solid var(--hs-brass);
  border-radius: var(--hs-radius-md);
}

/* Contact Page & Shared ContactForm */
.hs-contact-cards-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.hs-contact-info-card {
  background: var(--hs-surface);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-md);
  padding: 1.35rem;
}

.hs-contact-info-card h2 {
  font-size: 1.18rem;
  margin-bottom: 0.5rem;
}

.hs-accent-link {
  color: var(--hs-brass-hover);
  font-weight: 700;
}

.hs-contact-form-panel {
  background: var(--hs-surface);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.hs-form-panel-title {
  font-size: 1.35rem;
  margin-bottom: 0.35rem;
}

.hs-form-panel-subtitle {
  color: var(--hs-text-muted);
  margin-top: 0;
  margin-bottom: 1.25rem;
}

.hs-contact-form-panel input,
.hs-contact-form-panel textarea,
.hs-contact-form-panel select {
  width: 100%;
  min-height: 46px;
  background: var(--hs-bg);
  color: var(--hs-text);
  border: 1px solid var(--hs-border-strong);
  border-radius: var(--hs-radius-sm);
  padding: 0.65rem 0.85rem;
  font-family: var(--hs-font-sans);
  font-size: 0.98rem;
}

.hs-contact-form-panel button[type='submit'] {
  min-height: 46px;
  background: var(--hs-brass);
  color: var(--hs-brass-ink);
  font-weight: 700;
  border: 1px solid var(--hs-brass);
  border-radius: var(--hs-radius-sm);
  padding: 0.75rem 1.5rem;
  cursor: pointer;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.hs-footer {
  background: #04070e;
  border-top: 1px solid var(--hs-border-strong);
  color: var(--hs-text-muted);
  font-size: 0.9rem;
}

.hs-footer-specbar {
  background: #091020;
  border-bottom: 1px solid var(--hs-border);
  padding: 0.65rem 0;
  font-family: var(--hs-font-mono);
  font-size: 0.74rem;
}

.hs-footer-specbar-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.65rem;
}

.hs-footer-specbar strong {
  color: var(--hs-brass-hover);
}

.hs-footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding: 2.75rem 1.25rem 2rem;
}

.hs-footer-brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.75rem;
}

.hs-footer-brand-name {
  color: var(--hs-text);
  font-size: 1.15rem;
  font-weight: 800;
}

.hs-footer-desc {
  color: var(--hs-text-body);
  margin-top: 0;
}

.hs-footer-heading {
  color: var(--hs-text);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.85rem;
}

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

.hs-footer-list li {
  margin-bottom: 0.45rem;
}

.hs-footer-link {
  color: var(--hs-text-sec);
  text-decoration: none;
}

.hs-footer-link:hover {
  color: var(--hs-brass-hover);
  text-decoration: underline;
}

.hs-footer-disclosures {
  border-top: 1px solid var(--hs-border);
  padding-top: 1.25rem;
  padding-bottom: 1.25rem;
  font-size: 0.8rem;
  color: var(--hs-text-muted);
}

.hs-footer-disclosures p {
  margin: 0.4rem 0;
}

.hs-footer-bottom {
  border-top: 1px solid var(--hs-border);
  padding-top: 1.15rem;
  padding-bottom: 1.75rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.hs-footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
}

.hs-footer-legal a {
  color: var(--hs-text-sec);
  text-decoration: none;
}

/* ==========================================================================
   Responsive Breakpoints (768px Tablet / 1024px+ Desktop)
   ========================================================================== */

@media (min-width: 768px) {
  .hs-spec-meta {
    display: inline-flex;
  }

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

  .hs-estimator-selects {
    grid-template-columns: repeat(2, 1fr);
  }

  .hs-span-full {
    grid-column: 1 / -1;
  }

  .hs-systems-grid,
  .hs-articles-grid,
  .hs-contact-cards-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .hs-guide-card {
    grid-template-columns: 240px 1fr;
    align-items: center;
  }

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

@media (min-width: 1024px) {
  .hs-mobile-toggle,
  .hs-nav-backdrop {
    display: none !important;
  }

  .hs-nav {
    position: static;
    width: auto;
    height: auto;
    background: transparent;
    border: 0;
    padding: 0;
    transform: none;
    overflow: visible;
  }

  .hs-nav-list {
    flex-direction: row;
    align-items: center;
    gap: 0.35rem;
  }

  .hs-hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }

  .hs-simulator-layout {
    grid-template-columns: 0.95fr 1.05fr;
    padding: 1.85rem;
  }

  .hs-tablist {
    grid-template-columns: repeat(4, 1fr);
  }

  .hs-panel-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }

  .hs-dual-tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hs-systems-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .hs-articles-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .hs-content-with-sidebar {
    grid-template-columns: minmax(0, 1fr) 340px;
  }

  .hs-footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
  }
}