/* ==========================================================================
   ZOK - PASSIVE ANTI-DRONE PROTECTION (INDUSTRIAL B2B DESIGN SYSTEM)
   Style: Strict Industrial Engineering / Brutalist Minimalism
   ========================================================================== */

/* --- CSS Variables & Design Tokens --- */
:root {
  /* Color Palette */
  --color-bg: #FFFFFF;
  --color-bg-alt: #F4F5F7;
  --color-bg-dark: #121418;
  --color-bg-card-dark: #1A1D23;
  --color-bg-dark-subtle: #22262E;
  
  --color-text-main: #111317;
  --color-text-muted: #5C6270;
  --color-text-light: #F4F5F7;
  --color-text-light-muted: #A1A7B5;
  
  /* Industrial Accent (Safety Yellow & Construction Orange) */
  --color-accent: #FFB800;
  --color-accent-hover: #E5A600;
  --color-accent-active: #CC9400;
  --color-accent-text: #0B0C0E;
  
  --color-accent-orange: #FF5A1F;
  
  /* Borders & Technical Grids */
  --border-light: #DCE0E6;
  --border-dark: #2B303A;
  --border-active: #FFB800;
  
  /* Typography */
  --font-heading: 'Barlow Condensed', 'Oswald', 'Montserrat', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Roboto Mono', monospace;
  
  /* Layout */
  --container-width: 1280px;
  --container-wide: 1440px;
  --header-height: 80px;
  --section-spacing: 96px;
  --section-spacing-mobile: 56px;
  
  /* Industrial Shapes (Strict Rectangles, Sharp Corners) */
  --radius-none: 0px;
  --radius-sm: 2px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* --- Reset & Global Rules --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-main);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
}

ul, ol {
  list-style: none;
}

/* --- Utility Containers --- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.container-fluid {
  width: 100%;
  padding-left: 24px;
  padding-right: 24px;
}

/* --- Industrial Pattern Utilities --- */
.hazard-stripe-bar {
  height: 8px;
  background: repeating-linear-gradient(
    -45deg,
    var(--color-accent),
    var(--color-accent) 12px,
    #111317 12px,
    #111317 24px
  );
  width: 100%;
}

.hazard-stripe-subtle {
  background: repeating-linear-gradient(
    -45deg,
    rgba(255, 184, 0, 0.15),
    rgba(255, 184, 0, 0.15) 10px,
    transparent 10px,
    transparent 20px
  );
}

.tech-grid-pattern {
  background-image: 
    linear-gradient(to right, rgba(0, 0, 0, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 0, 0, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
}

.tech-grid-pattern-dark {
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* --- Typography Helpers --- */
.font-heading {
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: -0.01em;
  font-weight: 700;
}

.font-mono {
  font-family: var(--font-mono);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  background: #E8EBF0;
  padding: 4px 10px;
  border-left: 3px solid var(--color-accent);
}

.section-label.dark {
  background: var(--color-bg-dark-subtle);
  color: var(--color-accent);
  border-left-color: var(--color-accent);
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 3.8vw, 3rem);
  line-height: 1.1;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--color-text-main);
  letter-spacing: -0.02em;
}

.section-title.dark {
  color: #FFFFFF;
}

/* --- Industrial Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 14px 28px;
  cursor: pointer;
  transition: all var(--transition-fast);
  border-radius: var(--radius-none);
  position: relative;
  text-align: center;
  user-select: none;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #000000;
  border: 2px solid var(--color-accent);
}

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

.btn-primary:active {
  background-color: var(--color-accent-active);
  transform: translateY(0);
}

.btn-outline-dark {
  background-color: transparent;
  color: var(--color-text-main);
  border: 2px solid var(--color-text-main);
}

.btn-outline-dark:hover {
  background-color: var(--color-text-main);
  color: #FFFFFF;
}

.btn-outline-light {
  background-color: rgba(255, 255, 255, 0.05);
  color: #FFFFFF;
  border: 2px solid rgba(255, 255, 255, 0.4);
}

.btn-outline-light:hover {
  background-color: #FFFFFF;
  color: var(--color-bg-dark);
  border-color: #FFFFFF;
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.9375rem;
}

.btn-icon-arrow::after {
  content: '→';
  font-family: var(--font-body);
  font-weight: 700;
  transition: transform var(--transition-fast);
}

.btn-icon-arrow:hover::after {
  transform: translateX(4px);
}

/* ==========================================================================
   1. HEADER / NAVIGATION
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: #FFFFFF;
  border-bottom: 2px solid var(--border-light);
  height: var(--header-height);
}

.header-container {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  height: 100%;
  max-width: 100%;
  padding: 0 0 0 32px;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
}

.brand-logo-icon {
  width: 38px;
  height: 38px;
  background-color: #111317;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.brand-logo-icon svg {
  width: 26px;
  height: 26px;
  fill: var(--color-accent);
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  color: #111317;
  text-transform: uppercase;
}

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-left: 12px;
  padding-left: 12px;
  border-left: 1px solid var(--border-light);
  display: none;
}

@media (min-width: 992px) {
  .brand-tagline {
    display: block;
  }
}

.main-nav {
  display: none;
  align-items: center;
}

@media (min-width: 900px) {
  .main-nav {
    display: flex;
    gap: 24px;
  }
}

.nav-link {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  color: #22262E;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
  padding: 8px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-fast);
}

.nav-link:hover {
  color: #000000;
}

.nav-link:hover::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: stretch;
}

.header-phone-box {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 0 28px;
  border-left: 1px solid var(--border-light);
}


.header-phone-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

.header-phone-number {
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 800;
  color: #111317;
  letter-spacing: 0.02em;
}

.header-cta-btn {
  display: none;
}

.header-cta-btn:hover {
  background-color: var(--color-accent-hover);
}

.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  background: #111317;
  color: #FFFFFF;
  cursor: pointer;
}

@media (min-width: 900px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* ==========================================================================
   2. HERO SECTION
   ========================================================================== */
.hero-section {
  position: relative;
  height: calc(100vh - var(--header-height));
  min-height: 560px;
  display: flex;
  align-items: center;
  background-color: #111317;
  background-image: url('../assets/images/hero-bg.jpg');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  padding: 60px 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(10, 12, 16, 0.94) 0%,
    rgba(10, 12, 16, 0.85) 45%,
    rgba(10, 12, 16, 0.35) 100%
  );
}

.hero-container {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-content-wrapper {
  max-width: 680px;
  position: relative;
}

.hero-dark-box {
  background-color: rgba(18, 20, 26, 0.92);
  border: 1px solid var(--border-dark);
  padding: 48px 44px;
  position: relative;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.hero-hatch-pattern {
  height: 14px;
  background: repeating-linear-gradient(
    -45deg,
    rgba(255, 255, 255, 0.15),
    rgba(255, 255, 255, 0.15) 2px,
    transparent 2px,
    transparent 8px
  );
  margin-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 5.2vw, 4.2rem);
  line-height: 0.98;
  font-weight: 900;
  text-transform: uppercase;
  color: #FFFFFF;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 1.1875rem;
  line-height: 1.55;
  color: #D1D5DB;
  margin-bottom: 36px;
  font-weight: 400;
}

.hero-actions-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.hero-btn {
  background-color: #FFFFFF;
  color: #111317;
  border: 2px solid #FFFFFF;
}

.hero-btn:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #000000;
}

/* Floating / Attached Accent Badge */
.hero-floating-badge {
  position: absolute;
  top: 48px;
  right: -130px;
  background-color: var(--color-accent);
  color: #000000;
  padding: 16px 20px;
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 900;
  line-height: 1.25;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
  border: 2px solid #000000;
  text-align: left;
  z-index: 5;
}

@media (max-width: 900px) {
  .hero-floating-badge {
    position: static;
    margin-bottom: 20px;
    display: inline-block;
  }
  .hero-dark-box {
    padding: 32px 24px;
  }
}

/* Hero Stats Bar */
.hero-specs-bar {
  margin-top: 48px;
  background: rgba(14, 16, 20, 0.95);
  border: 1px solid var(--border-dark);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  padding: 20px 32px;
  gap: 24px;
}

.spec-item {
  border-left: 3px solid var(--color-accent);
  padding-left: 14px;
}

.spec-val {
  font-family: var(--font-heading);
  font-size: 1.625rem;
  font-weight: 800;
  color: #FFFFFF;
  line-height: 1.1;
}

.spec-desc {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-light-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 4px;
}

/* ==========================================================================
   3. ABOUT TECHNOLOGY SECTION (О КОНСТРУКЦИИ)
   ========================================================================== */
.section-about {
  padding: var(--section-spacing) 0;
  background-color: #FFFFFF;
  position: relative;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: stretch;
}

@media (min-width: 992px) {
  .about-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 64px;
  }
}

.about-content-col {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.about-h2 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 3.2vw, 2.75rem);
  line-height: 1.05;
  font-weight: 800;
  text-transform: uppercase;
  color: #111317;
  margin-bottom: 36px;
  letter-spacing: -0.01em;
}

.about-points-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
  margin-bottom: 40px;
}

.about-point-card {
  display: flex;
  gap: 20px;
  padding: 20px 24px;
  background-color: var(--color-bg-alt);
  border-left: 4px solid #111317;
  transition: border-color var(--transition-fast);
}

.about-point-card:hover {
  border-left-color: var(--color-accent);
}

.point-number {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-accent);
  background-color: #111317;
  width: 36px;
  height: 36px;
  min-width: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.point-body strong {
  display: block;
  font-size: 1.0625rem;
  font-weight: 800;
  color: #111317;
  margin-bottom: 6px;
}

.point-body p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  line-height: 1.5;
}

.tech-specs-table-wrapper {
  margin-top: 12px;
  border: 1px solid var(--border-light);
  background-color: #FFFFFF;
}

.tech-specs-header {
  background-color: #111317;
  color: #FFFFFF;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: flex;
  justify-content: space-between;
}

.tech-spec-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.875rem;
}

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

.tech-spec-name {
  color: var(--color-text-muted);
}

.tech-spec-value {
  font-weight: 700;
  font-family: var(--font-mono);
  color: #111317;
}

.about-image-col {
  position: relative;
  min-height: 500px;
}

.about-img-frame {
  height: 100%;
  width: 100%;
  position: relative;
  border: 2px solid #111317;
  overflow: hidden;
  background-color: #111317;
}

.about-img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.about-img-badge {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(18, 20, 26, 0.95);
  color: #FFFFFF;
  padding: 16px 20px;
  border-top: 2px solid var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.img-badge-text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.img-badge-status {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-accent);
  font-weight: 700;
}

/* ==========================================================================
   4. WHAT WE PROTECT / SOLUTIONS (ЧТО МЫ УКРЫВАЕМ)
   ========================================================================== */
.section-solutions {
  padding: var(--section-spacing) 0;
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.solutions-top-bar {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 56px;
}

@media (min-width: 900px) {
  .solutions-top-bar {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }
}

.solutions-header-text {
  max-width: 680px;
}

.solutions-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-top: 12px;
}

/* 3-Column Solutions Grid */
.solutions-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 768px) {
  .solutions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1100px) {
  .solutions-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.solution-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}

.solution-card:hover {
  transform: translateY(-4px);
  border-color: #111317;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
}

.solution-card-img-wrap {
  position: relative;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background-color: #111317;
  border-bottom: 2px solid #111317;
}

.solution-card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.solution-card:hover .solution-card-img-wrap img {
  transform: scale(1.03);
}

.solution-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  background-color: #111317;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 4px 8px;
  letter-spacing: 0.05em;
  border: 1px solid rgba(255, 184, 0, 0.4);
}

.solution-card-body {
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.solution-card-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  text-transform: uppercase;
  color: #111317;
  margin-bottom: 20px;
  line-height: 1.15;
}

.solution-bullets-list {
  margin-bottom: 28px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.solution-bullet-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9375rem;
  color: #333842;
  font-weight: 500;
}

.bullet-square {
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border: 1px solid #111317;
  flex-shrink: 0;
}

.solution-card-footer {
  display: none;
}

.solution-link-btn {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #111317;
  background: transparent;
  border: none;
  outline: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 0;
}

.solution-link-btn:hover {
  color: var(--color-accent-active);
}

/* ==========================================================================
   5. ADVANTAGES SECTION (ПРЕИМУЩЕСТВА)
   ========================================================================== */
.section-advantages {
  padding: var(--section-spacing) 0;
  background-color: var(--color-bg-dark);
  color: #FFFFFF;
  position: relative;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.advantage-item {
  background-color: var(--color-bg-card-dark);
  border: 1px solid var(--border-dark);
  padding: 32px 28px;
  position: relative;
  transition: border-color var(--transition-fast);
}

.advantage-item:hover {
  border-color: var(--color-accent);
}

.advantage-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 900;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.advantage-title {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 800;
  text-transform: uppercase;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.advantage-desc {
  font-size: 0.9375rem;
  color: var(--color-text-light-muted);
  line-height: 1.5;
}

/* ==========================================================================
   6. INTERACTIVE ESTIMATION CALCULATOR & CTA
   ========================================================================== */
.section-calc {
  padding: var(--section-spacing) 0;
  background-color: #FFFFFF;
}

.calc-box {
  background-color: #111317;
  color: #FFFFFF;
  border: 2px solid #111317;
  padding: 56px 48px;
  position: relative;
}

@media (max-width: 768px) {
  .calc-box {
    padding: 32px 20px;
  }
}

.calc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

@media (min-width: 992px) {
  .calc-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

.calc-form-group {
  margin-bottom: 24px;
}

.calc-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-text-light-muted);
  margin-bottom: 10px;
  letter-spacing: 0.05em;
}

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

@media (max-width: 500px) {
  .calc-options-grid {
    grid-template-columns: 1fr;
  }
}

.calc-option-btn {
  background-color: var(--color-bg-card-dark);
  border: 1px solid var(--border-dark);
  color: #FFFFFF;
  padding: 14px 16px;
  text-align: left;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 10px;
}

.calc-option-btn.active, .calc-option-btn:hover {
  background-color: #22262E;
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.calc-input {
  width: 100%;
  background-color: var(--color-bg-card-dark);
  border: 1px solid var(--border-dark);
  color: #FFFFFF;
  padding: 14px 16px;
  font-size: 0.9375rem;
  transition: border-color var(--transition-fast);
}

.calc-input:focus {
  border-color: var(--color-accent);
}

.calc-input::placeholder {
  color: #6B7280;
}

/* ==========================================================================
   7. FOOTER (ПОДВАЛ)
   ========================================================================== */
.site-footer {
  background-color: #0A0C0E;
  color: #FFFFFF;
  border-top: 2px solid var(--border-dark);
  padding-top: 64px;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--border-dark);
}

@media (min-width: 768px) {
  .footer-top-grid {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
}

.footer-brand-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  color: #FFFFFF;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.footer-desc {
  font-size: 0.9375rem;
  color: var(--color-text-light-muted);
  max-width: 380px;
  line-height: 1.6;
  margin-bottom: 24px;
}

.footer-col-title {
  font-family: var(--font-heading);
  font-size: 1.1875rem;
  font-weight: 800;
  text-transform: uppercase;
  color: #FFFFFF;
  margin-bottom: 20px;
  letter-spacing: 0.04em;
  border-left: 3px solid var(--color-accent);
  padding-left: 10px;
}

.footer-nav-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-nav-list a {
  color: var(--color-text-light-muted);
  font-size: 0.9375rem;
}

.footer-nav-list a:hover {
  color: var(--color-accent);
}

.footer-contact-item {
  display: flex;
  flex-direction: column;
  margin-bottom: 16px;
}

.contact-lbl {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: #6B7280;
  text-transform: uppercase;
}

.contact-val {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: #FFFFFF;
}

.footer-bottom-bar {
  padding: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #6B7280;
}

@media (min-width: 768px) {
  .footer-bottom-bar {
    flex-direction: row;
  }
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a:hover {
  color: #FFFFFF;
}

/* ==========================================================================
   8. MODAL INQUIRY FORM
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(10, 12, 16, 0.85);
  backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-window {
  background-color: #121418;
  color: #FFFFFF;
  border: 2px solid #2B303A;
  width: 100%;
  max-width: 540px;
  position: relative;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
  transform: translateY(20px);
  transition: transform 0.2s ease;
}

.modal-overlay.active .modal-window {
  transform: translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  background: var(--color-bg-dark-subtle);
  color: #FFFFFF;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 1px solid var(--border-dark);
}

.modal-close-btn:hover {
  background: var(--color-accent);
  color: #000000;
}

.modal-header {
  padding: 32px 32px 16px 32px;
}

.modal-title {
  font-family: var(--font-heading);
  font-size: 1.875rem;
  font-weight: 800;
  text-transform: uppercase;
  color: #FFFFFF;
  margin-bottom: 8px;
}

.modal-subtitle {
  font-size: 0.9375rem;
  color: var(--color-text-light-muted);
}

.modal-body {
  padding: 16px 32px 36px 32px;
}

.modal-form-group {
  margin-bottom: 18px;
}

.modal-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #9CA3AF;
  margin-bottom: 6px;
}

.modal-input {
  width: 100%;
  background: #1A1D23;
  border: 1px solid #2B303A;
  color: #FFFFFF;
  padding: 12px 14px;
  font-size: 0.9375rem;
}

.modal-input:focus {
  border-color: var(--color-accent);
}

.modal-notice {
  font-size: 0.75rem;
  color: #6B7280;
  margin-top: 14px;
  line-height: 1.4;
}

/* Success notification banner */
.toast-success {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: var(--color-accent);
  color: #000000;
  padding: 18px 24px;
  font-family: var(--font-heading);
  font-weight: 800;
  text-transform: uppercase;
  font-size: 1.0625rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  border: 2px solid #000000;
  z-index: 3000;
  display: none;
}

.toast-success.show {
  display: block;
  animation: slideInUp 0.3s ease forwards;
}

@keyframes slideInUp {
  from {
    transform: translateY(40px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* ==========================================================================
   SERVICES SECTION (НАШИ УСЛУГИ)
   ========================================================================== */
.section-services {
  padding: var(--section-spacing) 0;
  background: var(--color-bg-alt);
  position: relative;
}

.section-services::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(0, 0, 0, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 0, 0, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

.services-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 60px;
  position: relative;
  z-index: 1;
}

.services-header .section-label {
  margin-bottom: 16px;
}

.services-subtitle {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-top: 16px;
}

/* --- 2x2 Grid --- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  position: relative;
  z-index: 1;
  border: 2px solid var(--border-light);
  outline: none;
}

/* --- Service Card --- */
.service-card {
  background: #FFFFFF;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
  position: relative;
  border: 1px solid var(--border-light);
}

.service-card:hover {
  z-index: 2;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.12);
  transform: translateY(-3px);
}

/* Accent variant (4th card: Монтаж под ключ) */
.service-card--accent {
  background: var(--color-bg-dark);
}

.service-card--accent .service-card-title {
  color: #FFFFFF;
}

.service-card--accent .service-card-desc {
  color: var(--color-text-light-muted);
}

.service-card--accent .service-features-list li {
  color: #D1D5DB;
}

.service-card--accent .service-icon-svg {
  stroke: var(--color-accent);
}

/* --- Image Section --- */
.service-card-img-wrap {
  position: relative;
  height: 240px;
  overflow: hidden;
}

.service-card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.service-card:hover .service-card-img-wrap img {
  transform: scale(1.04);
}

.service-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.55) 0%, rgba(0,0,0,0.1) 60%, transparent 100%);
}

/* Number badge (01, 02...) */
.service-num-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 800;
  background: var(--color-accent);
  color: #000;
  padding: 4px 10px;
  letter-spacing: 0.06em;
  z-index: 2;
}

/* Optional / Key badge */
.service-optional-badge,
.service-key-badge {
  position: absolute;
  bottom: 16px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  z-index: 2;
}

.service-optional-badge {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(4px);
}

.service-key-badge {
  background: var(--color-accent);
  color: #000;
}

/* --- Card Body --- */
.service-card-body {
  padding: 28px 32px 32px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

/* Icon row */
.service-icon-row {
  margin-bottom: 14px;
}

.service-icon-svg {
  width: 28px;
  height: 28px;
  stroke: var(--color-accent);
}

.service-card-title {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  color: var(--color-text-main);
  line-height: 1.2;
  margin-bottom: 14px;
}

.service-card-desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
}

/* Feature list */
.service-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 28px;
  flex: 1;
}

.service-features-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.sf-dot {
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  margin-top: 5px;
}

/* CTA button */
.service-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 2px solid var(--border-light);
  color: var(--color-text-main);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 12px 24px;
  cursor: pointer;
  transition: all var(--transition-fast);
  align-self: flex-start;
}

.service-cta-btn:hover {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: #000;
}

.service-card--accent .service-cta-btn {
  border-color: var(--border-dark);
  color: #D1D5DB;
}

.service-card--accent .service-cta-btn:hover {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: #000;
}

.service-cta-btn--primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #000;
}

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

/* --- Responsive --- */
@media (max-width: 900px) {
  .services-grid {
    grid-template-columns: 1fr;
    border: none;
    gap: 16px;
  }
  .service-card {
    border: 2px solid var(--border-light);
  }
  .service-card-img-wrap {
    height: 200px;
  }
}

/* ==========================================================================
   SP 542 ENGINEERING SECTION, BLAST WAVE CALCULATION & RIGGING HARDWARE
   Adhering to skill.md: Precision Engineering / Industrial B2B Aesthetic
   ========================================================================== */

/* --- SP 542 Section Container --- */
.section-sp542 {
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
  padding: var(--section-spacing) 0;
  position: relative;
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
}

.sp542-header {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 48px;
}

.sp542-header .section-label {
  justify-content: center;
  margin-bottom: 16px;
}

.sp542-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 900;
  color: #FFFFFF;
  letter-spacing: -0.01em;
  line-height: 1.15;
  text-transform: uppercase;
}

.sp542-subtitle {
  font-size: 1.0625rem;
  color: var(--color-text-light-muted);
  line-height: 1.6;
  margin-top: 16px;
}

.sp542-intro-card {
  background: var(--color-bg-card-dark);
  border: 1px solid var(--border-dark);
  border-left: 4px solid var(--color-accent);
  padding: 24px 28px;
  margin-bottom: 40px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sp542-intro-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: #FFFFFF;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
}

.sp542-intro-text {
  font-size: 0.9375rem;
  color: #D1D5DB;
  line-height: 1.65;
  max-width: 90ch;
}

/* --- Interactive Level Switcher --- */
.sp542-switcher-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
  justify-content: center;
}

.sp542-level-btn {
  background: var(--color-bg-card-dark);
  border: 1px solid var(--border-dark);
  color: #D1D5DB;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 10px 18px;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.sp542-level-btn:hover {
  border-color: var(--color-accent);
  color: #FFFFFF;
}

.sp542-level-btn.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #000000;
  font-weight: 800;
}

.sp542-level-btn .btn-badge {
  font-size: 0.6875rem;
  padding: 2px 6px;
  background: rgba(0,0,0,0.25);
  color: inherit;
  border-radius: 2px;
}

.sp542-level-btn.active .btn-badge {
  background: rgba(0,0,0,0.18);
  color: #000000;
}

/* --- Dual Matrix Grid --- */
.sp542-tables-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 48px;
}

.sp542-table-box {
  background: var(--color-bg-card-dark);
  border: 1px solid var(--border-dark);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sp542-table-header {
  padding: 18px 24px;
  background: #14171E;
  border-bottom: 1px solid var(--border-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sp542-table-title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: #FFFFFF;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sp542-table-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--color-accent);
  background: rgba(255, 184, 0, 0.12);
  padding: 4px 8px;
  border: 1px solid rgba(255, 184, 0, 0.3);
}

.sp542-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.sp542-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.sp542-table th,
.sp542-table td {
  padding: 12px 14px;
  border-bottom: 1px solid #232833;
  border-right: 1px solid #232833;
}

.sp542-table th:last-child,
.sp542-table td:last-child {
  border-right: none;
}

.sp542-table th {
  background: #181D26;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #9CA3AF;
  white-space: nowrap;
}

.sp542-table th.col-level {
  text-align: center;
  width: 14%;
}

.sp542-table td.col-level {
  text-align: center;
}

.sp542-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.sp542-table .row-name {
  font-weight: 600;
  color: #E5E7EB;
  line-height: 1.4;
}

/* Highlighted Column during filter */
.sp542-table th.highlight-col,
.sp542-table td.highlight-col {
  background: rgba(255, 184, 0, 0.08) !important;
  border-left: 1px solid var(--color-accent);
  border-right: 1px solid var(--color-accent);
}

/* Badges for + / - */
.sp542-badge-yes {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: rgba(34, 197, 94, 0.15);
  border: 1px solid rgba(34, 197, 94, 0.5);
  color: #4ADE80;
  font-weight: 900;
  font-size: 0.875rem;
  border-radius: 2px;
}

.sp542-badge-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  color: #4B5563;
  font-weight: 600;
  font-size: 1rem;
}

/* --- Level Description Callout --- */
.sp542-level-info-box {
  background: #14171E;
  border: 1px solid var(--border-dark);
  padding: 20px 24px;
  margin-top: -24px;
  margin-bottom: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.sp542-level-info-text {
  font-size: 0.9375rem;
  color: #D1D5DB;
  line-height: 1.5;
}

.sp542-level-info-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 4px;
}

/* --- Blast Wave & Project Screenshot Showcase --- */
.sp542-project-showcase {
  background: var(--color-bg-card-dark);
  border: 1px solid var(--border-dark);
  padding: 32px;
  margin-top: 12px;
}

.sp542-showcase-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border-dark);
  padding-bottom: 20px;
}

.sp542-showcase-title-box h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  color: #FFFFFF;
  text-transform: uppercase;
}

.sp542-showcase-title-box p {
  font-size: 0.9375rem;
  color: var(--color-text-light-muted);
  margin-top: 6px;
  max-width: 75ch;
}

.sp542-cards-dual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.sp542-media-card {
  background: #121418;
  border: 1px solid var(--border-dark);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
  cursor: pointer;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.sp542-media-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent);
}

.sp542-media-thumb {
  height: 260px;
  position: relative;
  overflow: hidden;
  background: #0B0D11;
}

.sp542-media-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.sp542-media-card:hover .sp542-media-thumb img {
  transform: scale(1.03);
}

.sp542-media-overlay-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(17, 20, 25, 0.85);
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 184, 0, 0.4);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 4px 8px;
  text-transform: uppercase;
}

.sp542-zoom-hint {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: rgba(0, 0, 0, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 4px 8px;
  display: flex;
  align-items: center;
  gap: 6px;
  border-radius: 2px;
  transition: background var(--transition-fast);
}

.sp542-media-card:hover .sp542-zoom-hint {
  background: var(--color-accent);
  color: #000000;
  border-color: var(--color-accent);
}

.sp542-media-body {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.sp542-media-title {
  font-family: var(--font-heading);
  font-size: 1.1875rem;
  font-weight: 800;
  color: #FFFFFF;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.sp542-media-desc {
  font-size: 0.875rem;
  color: #9CA3AF;
  line-height: 1.55;
  margin-bottom: 16px;
  flex: 1;
}

.sp542-param-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.sp542-param-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: #D1D5DB;
  background: #1E232D;
  border: 1px solid #2F3644;
  padding: 3px 8px;
}

/* --- Hardware Catalog (Комплектация объектов) --- */
.hardware-showcase-box {
  margin-top: 36px;
  background: #FFFFFF;
  border: 2px solid var(--border-light);
  padding: 28px 32px;
}

.hardware-showcase-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.hardware-title-box h4 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text-main);
  text-transform: uppercase;
}

.hardware-title-box p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.hardware-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.hardware-item-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--border-light);
  padding: 16px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  cursor: pointer;
}

.hardware-item-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.hardware-thumb-wrap {
  width: 100%;
  height: 150px;
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  overflow: hidden;
  margin-bottom: 12px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hardware-thumb-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.hardware-item-card:hover .hardware-thumb-wrap img {
  transform: scale(1.05);
}

.hardware-item-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 800;
  color: var(--color-text-main);
  text-transform: uppercase;
  margin-bottom: 4px;
  line-height: 1.2;
}

.hardware-standard-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  color: #4B5563;
  margin-bottom: 8px;
}

.hardware-item-desc {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.45;
  margin-bottom: 12px;
  flex: 1;
}

.hardware-item-spec {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: #000;
  background: rgba(255, 184, 0, 0.2);
  padding: 3px 6px;
  border-left: 2px solid var(--color-accent);
  align-self: flex-start;
}

/* --- Lightbox Modal --- */
.lightbox-modal {
  position: fixed;
  inset: 0;
  background: rgba(10, 12, 16, 0.94);
  backdrop-filter: blur(8px);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.lightbox-modal.active {
  display: flex;
}

.lightbox-container {
  background: #161A22;
  border: 1px solid var(--border-dark);
  max-width: 1080px;
  width: 100%;
  max-height: 92vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.6);
}

.lightbox-header {
  padding: 16px 20px;
  background: #11141A;
  border-bottom: 1px solid var(--border-dark);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.lightbox-title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 800;
  color: #FFFFFF;
  text-transform: uppercase;
}

.lightbox-close-btn {
  background: transparent;
  border: none;
  color: #9CA3AF;
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast);
}

.lightbox-close-btn:hover {
  color: var(--color-accent);
}

.lightbox-body {
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-image-wrap {
  width: 100%;
  display: flex;
  justify-content: center;
  background: #000;
  border: 1px solid var(--border-dark);
}

.lightbox-image-wrap img {
  max-height: 65vh;
  width: auto;
  max-width: 100%;
  object-fit: contain;
}

.lightbox-caption {
  margin-top: 16px;
  font-size: 0.9375rem;
  color: #D1D5DB;
  line-height: 1.6;
  text-align: left;
  width: 100%;
}

/* --- Responsive rules for SP 542 and Hardware --- */
@media (max-width: 980px) {
  .sp542-tables-grid {
    grid-template-columns: 1fr;
  }
  .sp542-cards-dual {
    grid-template-columns: 1fr;
  }
  .hardware-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .hardware-grid-4 {
    grid-template-columns: 1fr;
  }
  .sp542-level-btn {
    font-size: 0.75rem;
    padding: 8px 12px;
  }
  .sp542-project-showcase {
    padding: 20px 16px;
  }
  .hardware-showcase-box {
    padding: 20px 16px;
  }
}