/* ==========================================================================
   S.R. TECH ENGINEERING SERVICES - PRECISION DESIGN SYSTEM
   Human-centric industrial engineering palette (Tempered Copper, Forge Graphite, Warm Stone).
   High-contrast, zero AI-slop, clean architectural lines, refined precision radius.
   Zero build tool required.
   ========================================================================== */

:root {
  /* ==========================================================================
     COMPANY LOGO BRAND RED & INDUSTRIAL FORGE SCALE
     Directly extracted from SR logo emblem (public/assets/images/logo.png: #ED1C24)
     Replaces generic AI copper with authentic EPC engineering crimson & scarlet
     ========================================================================== */
  --sr-brand-red: #c5221f;          /* Precision Engineering Crimson (WCAG AA 5.8:1 on white) */
  --sr-brand-red-hover: #9e1b18;    /* Deep Molten Red */
  --sr-brand-red-light: #ed1c24;    /* Exact SR Logo Scarlet (Signal Highlight) */
  --sr-brand-red-subtle: #fef2f2;   /* Crisp Porcelain Tint */
  --sr-brand-red-border: #fecaca;   /* Soft Red Border */
  --sr-brand-red-text: #991b1b;     /* High Contrast Text (WCAG AAA 7.2:1 on light) */
  --sr-brand-red-glow: rgba(197, 34, 31, 0.16);

  /* Seamless template aliases mapped to Brand Red */
  --sr-copper: var(--sr-brand-red);
  --sr-copper-hover: var(--sr-brand-red-hover);
  --sr-copper-light: var(--sr-brand-red-light);
  --sr-copper-subtle: var(--sr-brand-red-subtle);
  --sr-copper-border: var(--sr-brand-red-border);
  --sr-copper-text: var(--sr-brand-red-text);
  --sr-copper-glow: var(--sr-brand-red-glow);

  /* Legacy aliases */
  --sr-amber: var(--sr-brand-red);
  --sr-amber-hover: var(--sr-brand-red-hover);
  --sr-amber-light: var(--sr-brand-red-light);
  --sr-amber-subtle: var(--sr-brand-red-subtle);
  --sr-amber-border: var(--sr-brand-red-border);
  --sr-amber-glow: var(--sr-brand-red-glow);

  /* Architectural Forge & Steel Scale */
  --sr-navy-deep: #0e1726;
  --sr-navy-main: #192742;
  --sr-navy-surface: #203152;
  --sr-navy-elevated: #2e3e5c;
  --sr-navy-border: #cbd5e1;

  /* Natural Tactile Ground & Canvas Surfaces (Eliminates blinding white glare) */
  --sr-bg-page: #f7f6f2;
  --sr-bg-white: #ffffff;
  --sr-bg-muted: #eeece6;
  --sr-bg-stone: #ede9e1;
  --sr-bg-card: #ffffff;
  --sr-bg-tint: #f3efe6;

  /* High-Legibility Slate Text Scale (WCAG AAA contrast on light) */
  --sr-text-heading: #090d16;
  --sr-text-body: #1e293b;
  --sr-text-secondary: #334155;
  --sr-text-muted: #475569;
  --sr-text-inverse: #ffffff;

  /* Architectural Borders */
  --sr-border-light: #e2dfd7;
  --sr-border-medium: #cbd0d8;
  --sr-border-dark: #334155;

  /* Typography */
  --sr-font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --sr-font-mono: 'SFMono-Regular', Consolas, "Liberation Mono", Menlo, Courier, monospace;

  /* Refined Precision Radii */
  --sr-radius-sm: 4px;
  --sr-radius-md: 6px;
  --sr-radius-lg: 8px;

  /* Shadows */
  --sr-shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
  --sr-shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06);
  --sr-shadow-lg: 0 12px 28px -4px rgba(15, 23, 42, 0.08);
}

/* Browser Surface Styling */
::selection {
  background-color: var(--sr-copper);
  color: #ffffff;
}

::-moz-selection {
  background-color: var(--sr-copper);
  color: #ffffff;
}

/* Base Document Styling */
html {
  font-size: 16px;
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  font-family: var(--sr-font-sans);
  color: var(--sr-text-body);
  background-color: var(--sr-bg-page);
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

.max-w-700 {
  max-width: 700px;
}

/* High-Legibility Bootstrap Overrides */
.text-secondary {
  color: var(--sr-text-secondary) !important;
}

.text-muted {
  color: var(--sr-text-muted) !important;
}

.text-dark {
  color: var(--sr-text-heading) !important;
}

/* Form and Interactive Element Radii */
.btn,
.form-control,
.form-select,
.input-group-text,
.badge,
.alert,
.dropdown-menu,
.nav-pills .nav-link,
.pagination .page-link,
.toast {
  border-radius: var(--sr-radius-md) !important;
}

.card,
.modal-content,
.sr-service-card,
.sr-project-card,
.sr-stat-box,
.sr-contact-card {
  border-radius: var(--sr-radius-lg) !important;
}

/* Topbar - Architectural Grounding Header (Eliminates top-of-screen white glare) */
.sr-topbar {
  background-color: var(--sr-navy-deep);
  color: #94a3b8;
  font-size: 0.835rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.5rem 0;
  font-weight: 500;
}

.sr-topbar .text-secondary,
.sr-topbar .text-muted {
  color: #94a3b8 !important;
}

.sr-topbar a {
  color: #f1f5f9 !important;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s ease;
}

.sr-topbar a:hover {
  color: var(--sr-copper-light) !important;
}

.sr-topbar-pill {
  background: rgba(197, 34, 31, 0.22);
  border: 1px solid rgba(237, 28, 36, 0.45);
  color: #fecaca;
  padding: 2px 8px;
  font-size: 0.725rem;
  font-family: var(--sr-font-mono);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: var(--sr-radius-sm);
}

.sr-topbar-pill::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background-color: #10b981;
  border-radius: 50%;
}

.sr-topbar .btn-sr-outline-light {
  background: transparent;
  color: #f1f5f9 !important;
  border-color: rgba(255, 255, 255, 0.2);
}

.sr-topbar .btn-sr-outline-light:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff !important;
  border-color: rgba(255, 255, 255, 0.4);
}

/* Main Navigation Bar */
.sr-navbar {
  background-color: var(--sr-bg-white);
  border-bottom: 1px solid var(--sr-border-light);
  box-shadow: var(--sr-shadow-sm);
  padding: 0.85rem 0;
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 1025;
  transition: padding 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              background-color 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.sr-navbar.is-scrolled {
  padding: 0.55rem 0;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(14, 23, 38, 0.08);
  border-bottom-color: var(--sr-border-medium);
}

.sr-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
}

.sr-brand-logo-plate {
  background: #ffffff;
  padding: 3px 6px;
  display: flex;
  align-items: center;
  border: 1px solid var(--sr-border-light);
  border-radius: var(--sr-radius-sm);
}

.sr-brand-logo-plate img {
  height: 40px;
  width: auto;
  display: block;
  transition: height 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.sr-navbar.is-scrolled .sr-brand-logo-plate img {
  height: 35px;
}

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

.sr-brand-title {
  color: var(--sr-navy-deep);
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: 0.01em;
  line-height: 1.15;
}

.sr-brand-sub {
  color: var(--sr-copper-text);
  font-size: 0.7rem;
  font-family: var(--sr-font-mono);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sr-nav-link {
  color: var(--sr-text-heading) !important;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 0.55rem 0.85rem !important;
  transition: all 0.15s ease;
  border-radius: var(--sr-radius-sm);
}

.sr-nav-link:hover {
  color: var(--sr-copper-text) !important;
  background-color: var(--sr-bg-muted);
}

.sr-nav-link.active {
  color: var(--sr-copper-text) !important;
  background-color: var(--sr-copper-subtle);
  font-weight: 700;
}

/* Precision Button System */
.btn-sr-primary {
  background-color: var(--sr-copper);
  color: #ffffff !important;
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  border: 1px solid var(--sr-copper);
  padding: 0.65rem 1.35rem;
  border-radius: var(--sr-radius-md);
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
  box-shadow: 0 1px 2px rgba(197, 34, 31, 0.2);
}

.btn-sr-primary:hover,
.btn-sr-primary:focus {
  background-color: var(--sr-copper-hover);
  border-color: var(--sr-copper-hover);
  color: #ffffff !important;
  box-shadow: 0 3px 8px rgba(197, 34, 31, 0.28);
  transform: translateY(-1px);
}

.btn-sr-outline-light {
  background-color: #ffffff;
  color: var(--sr-text-heading) !important;
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  border: 1px solid var(--sr-border-medium);
  padding: 0.65rem 1.35rem;
  border-radius: var(--sr-radius-md);
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
}

.btn-sr-outline-light:hover {
  background-color: var(--sr-bg-muted);
  color: var(--sr-navy-deep) !important;
  border-color: var(--sr-navy-deep);
}

.btn-sr-dark {
  background-color: var(--sr-navy-deep);
  color: #ffffff !important;
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  border: 1px solid var(--sr-navy-deep);
  padding: 0.65rem 1.35rem;
  border-radius: var(--sr-radius-md);
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
}

.btn-sr-dark:hover {
  background-color: var(--sr-copper);
  border-color: var(--sr-copper);
  color: #ffffff !important;
}

.btn-sr-sm {
  padding: 0.4rem 0.85rem !important;
  font-size: 0.825rem !important;
}

.btn-sr-copy {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0.42rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--sr-text-secondary) !important;
  background-color: #ffffff;
  border: 1px solid var(--sr-border-medium);
  border-radius: var(--sr-radius-sm);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  cursor: pointer;
  transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-sr-copy:hover {
  background-color: var(--sr-brand-red-subtle);
  border-color: var(--sr-brand-red-border);
  color: var(--sr-brand-red-text) !important;
  box-shadow: 0 2px 6px rgba(197, 34, 31, 0.12);
  transform: translateY(-1px);
}

.btn-sr-copy:active {
  transform: translateY(0);
}

.btn-sr-copy.copied {
  background-color: #ecfdf5 !important;
  border-color: #a7f3d0 !important;
  color: #065f46 !important;
}

/* Specification Badges & Tags */
.sr-spec-tag {
  font-family: var(--sr-font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  background: var(--sr-bg-muted);
  color: var(--sr-text-heading);
  border: 1px solid var(--sr-border-medium);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  text-transform: uppercase;
  border-radius: var(--sr-radius-sm);
}

.sr-spec-tag.light {
  background: #ffffff;
  color: var(--sr-navy-deep);
  border-color: var(--sr-border-medium);
}

.sr-spec-tag.copper,
.sr-spec-tag.warning {
  background: var(--sr-copper-subtle);
  color: var(--sr-copper-text);
  border-color: var(--sr-copper-border);
}

.sr-spec-tag.navy {
  background: var(--sr-navy-deep);
  color: #ffffff;
  border-color: var(--sr-navy-deep);
}

/* Hero Section - Clean Architectural Architecture (Warm Stone Ground + Subtle Backdrop) */
.sr-hero {
  position: relative;
  background-color: var(--sr-bg-page);
  background-image: linear-gradient(135deg, rgba(247, 246, 242, 0.94) 0%, rgba(237, 233, 225, 0.90) 100%), url('../images/hero-bg.jpg');
  background-size: cover;
  background-position: center center;
  padding: 4.5rem 0 3.5rem;
  border-bottom: 1px solid var(--sr-border-light);
  color: var(--sr-text-heading);
}

.sr-hero-title {
  font-size: clamp(2.15rem, 4.2vw, 3.15rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.16;
  color: var(--sr-navy-deep);
  margin-bottom: 1.25rem;
}

.sr-hero-lead {
  font-size: 1.1rem;
  color: var(--sr-text-secondary);
  max-width: 680px;
  margin-bottom: 1.75rem;
  line-height: 1.7;
  font-weight: 450;
}

/* Half-Image Hero Visual Card */
.sr-hero-visual-card {
  position: relative;
  border-radius: var(--sr-radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 45px -12px rgba(15, 23, 42, 0.18);
  border: 1px solid var(--sr-border-medium);
  background: var(--sr-navy-deep);
}

.sr-hero-image-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 11;
  overflow: hidden;
}

@media (max-width: 991px) {
  .sr-hero-image-wrap {
    aspect-ratio: 16 / 9;
  }
}

.sr-hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.sr-hero-visual-card:hover .sr-hero-image {
  transform: scale(1.03);
}

.sr-hero-image-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(14, 23, 38, 0.2) 0%, rgba(14, 23, 38, 0.65) 100%);
  pointer-events: none;
}

.sr-hero-float-badge {
  position: absolute;
  background: rgba(14, 23, 38, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--sr-radius-md);
  padding: 8px 14px;
  backdrop-filter: blur(8px);
  z-index: 3;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
}

.sr-hero-float-badge.top-right {
  top: 16px;
  right: 16px;
  border-color: rgba(237, 28, 36, 0.5);
}

.sr-hero-float-badge.bottom-left {
  bottom: 16px;
  left: 16px;
  border-color: rgba(237, 28, 36, 0.5);
}

.sr-hero-badge-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 1rem;
}

.sr-hero-badge-icon.copper {
  background: rgba(197, 34, 31, 0.25);
  color: #fca5a5;
}

/* Metric Items - Tactile Industrial Counters */
.sr-metric-item {
  background-color: #ffffff;
  border: 1px solid var(--sr-border-medium);
  padding: 1.5rem;
  height: 100%;
  border-radius: var(--sr-radius-lg);
  box-shadow: var(--sr-shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.sr-metric-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--sr-shadow-md);
  border-color: #94a3b8;
}

.sr-metric-num {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--sr-navy-deep);
  font-family: var(--sr-font-mono);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.sr-metric-label {
  color: var(--sr-text-secondary);
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1.35;
}

/* Backward compatibility for sr-stat-box */
.sr-stat-box {
  background-color: #ffffff;
  border: 1px solid var(--sr-border-medium);
  padding: 1.25rem;
  height: 100%;
  border-radius: var(--sr-radius-md);
  box-shadow: var(--sr-shadow-sm);
}

.sr-stat-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--sr-navy-deep);
  font-family: var(--sr-font-mono);
  line-height: 1;
  margin-bottom: 0.35rem;
}

.sr-stat-label {
  color: var(--sr-text-secondary);
  font-size: 0.825rem;
  font-weight: 700;
}

/* ==========================================================================
   Tactile Industrial Contact Cards & Action Triggers
   ========================================================================== */
.sr-contact-card {
  background-color: #ffffff;
  border: 1px solid var(--sr-border-light);
  border-radius: var(--sr-radius-md) !important;
  padding: 0.85rem 1.15rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.sr-contact-card:hover {
  border-color: var(--sr-border-medium);
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.06);
  transform: translateY(-1px);
}

.sr-contact-card-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--sr-radius-md);
  background-color: var(--sr-brand-red-subtle);
  border: 1px solid var(--sr-brand-red-border);
  color: var(--sr-brand-red);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  flex-shrink: 0;
}

.sr-contact-card-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.sr-contact-card-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--sr-brand-red-text);
  margin-bottom: 2px;
}

.sr-contact-card-value {
  color: var(--sr-text-heading);
  font-weight: 700;
  font-size: 1.025rem;
  text-decoration: none;
  transition: color 0.15s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sr-contact-card-value:hover {
  color: var(--sr-brand-red);
}

@media (max-width: 480px) {
  .sr-contact-card {
    flex-wrap: wrap;
    gap: 0.75rem;
  }
}

/* Section Typography */
.sr-section-title {
  font-weight: 800;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  letter-spacing: -0.02em;
  color: var(--sr-navy-deep);
  line-height: 1.22;
  margin-bottom: 0.5rem;
}

.sr-section-lead {
  font-size: 1.05rem;
  color: var(--sr-text-secondary);
  max-width: 640px;
  line-height: 1.65;
  margin-bottom: 0;
  font-weight: 450;
}

/* Service & Discipline Cards */
.sr-service-card {
  background: #ffffff;
  border: 1px solid var(--sr-border-medium);
  padding: 1.75rem;
  height: 100%;
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
  position: relative;
  box-shadow: var(--sr-shadow-sm);
}

.sr-service-card:hover {
  border-color: var(--sr-copper);
  transform: translateY(-3px);
  box-shadow: var(--sr-shadow-md);
}

.sr-service-icon-box {
  width: 48px;
  height: 48px;
  background-color: #fdf5f0;
  color: var(--sr-copper-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  margin-bottom: 1.15rem;
  border: 1px solid var(--sr-copper-border);
  border-radius: var(--sr-radius-md);
}

.sr-service-title {
  font-weight: 700;
  font-size: 1.15rem;
  margin-bottom: 0.65rem;
  color: var(--sr-navy-deep);
  line-height: 1.3;
}

.sr-service-desc {
  font-size: 0.935rem;
  color: var(--sr-text-secondary);
  margin-bottom: 1.25rem;
  flex-grow: 1;
  line-height: 1.62;
}

/* Project Cards */
.sr-project-card {
  background: #ffffff;
  border: 1px solid var(--sr-border-medium);
  height: 100%;
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
  box-shadow: var(--sr-shadow-sm);
  overflow: hidden;
}

.sr-project-card:hover {
  border-color: var(--sr-copper);
  transform: translateY(-3px);
  box-shadow: var(--sr-shadow-md);
}

.sr-project-meta {
  padding: 1.35rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.sr-project-header {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--sr-navy-deep);
  margin-bottom: 0.5rem;
  line-height: 1.35;
}

/* Split-screen Capability Showcase Ledger */
.sr-capability-row {
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--sr-border-light);
  padding: 1.25rem 0;
  transition: background-color 0.15s ease;
}

.sr-capability-row:last-child {
  border-bottom: none;
}

/* Interactive Forms */
.sr-form-control {
  background-color: #ffffff;
  border: 1px solid var(--sr-border-medium);
  color: var(--sr-text-heading);
  padding: 0.7rem 0.95rem;
  font-size: 0.925rem;
  border-radius: var(--sr-radius-md);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.sr-form-control:focus {
  border-color: var(--sr-copper);
  box-shadow: 0 0 0 3px var(--sr-copper-glow);
  outline: none;
}

/* Modal Pop-up Announcement */
.sr-popup-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(14, 23, 38, 0.65);
  backdrop-filter: blur(4px);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.sr-popup-backdrop.show {
  display: flex;
}

.sr-popup-container {
  background-color: #ffffff;
  border: 1px solid var(--sr-border-medium);
  width: 100%;
  max-width: 580px;
  color: var(--sr-text-heading);
  box-shadow: var(--sr-shadow-lg);
  border-radius: var(--sr-radius-lg);
  overflow: hidden;
}

.sr-popup-header {
  background-color: #f8fafc;
  border-bottom: 1px solid var(--sr-border-light);
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sr-popup-body {
  padding: 1.75rem 1.5rem;
}

.sr-popup-close-btn {
  background: transparent;
  border: 1px solid var(--sr-border-medium);
  color: var(--sr-text-secondary);
  font-size: 1.15rem;
  line-height: 1;
  padding: 3px 8px;
  cursor: pointer;
  border-radius: var(--sr-radius-sm);
}

.sr-popup-close-btn:hover {
  background: var(--sr-bg-muted);
  color: var(--sr-navy-deep);
}

/* Grounding Footer */
.sr-footer {
  background-color: var(--sr-navy-deep);
  color: #94a3b8;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 3.5rem 0 1.5rem;
  font-size: 0.9rem;
}

.sr-footer-title {
  color: #ffffff;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sr-footer a {
  color: #cbd5e1;
  text-decoration: none;
  transition: color 0.15s ease;
}

.sr-footer a:hover {
  color: #ffffff;
}

.sr-bottom-bar {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.5rem;
  margin-top: 2.5rem;
  font-size: 0.825rem;
  color: #64748b;
}

/* Copy Toast */
.sr-copy-toast {
  position: fixed;
  bottom: 78px;
  right: 24px;
  background-color: var(--sr-navy-deep);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  padding: 10px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
  z-index: 10000;
  border-radius: var(--sr-radius-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  transform: translateY(8px);
}

.sr-copy-toast.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* ==========================================================================
   FLOATING ACTION STACK: WHATSAPP CHAT & SCROLL-TO-TOP
   Impeccable craft, tactile micro-interactions, collision-free geometry
   ========================================================================== */

/* WhatsApp Chat Floating Action Button */
.sr-whatsapp-chat {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 50px;
  height: 50px;
  background-color: #25d366;
  color: #ffffff;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 4px 18px rgba(37, 211, 102, 0.42), 0 2px 6px rgba(14, 23, 38, 0.16);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  z-index: 1020;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1),
              background-color 0.2s ease,
              box-shadow 0.22s ease;
}

.sr-whatsapp-chat:hover {
  background-color: #20ba5a;
  color: #ffffff;
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 8px 26px rgba(37, 211, 102, 0.52), 0 4px 10px rgba(14, 23, 38, 0.2);
}

.sr-whatsapp-chat:active {
  transform: translateY(0) scale(0.97);
  background-color: #128c7e;
  box-shadow: 0 3px 12px rgba(18, 140, 126, 0.4);
}

.sr-whatsapp-chat:focus-visible {
  outline: 2px solid #25d366;
  outline-offset: 3px;
}

.sr-whatsapp-icon {
  width: 28px;
  height: 28px;
  fill: #ffffff;
  filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.15));
  transition: transform 0.2s ease;
}

.sr-whatsapp-chat:hover .sr-whatsapp-icon {
  transform: scale(1.05);
}

/* Subtle ambient pulse ring */
.sr-whatsapp-pulse {
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  border: 2px solid rgba(37, 211, 102, 0.55);
  pointer-events: none;
  animation: sr-whatsapp-radiate 3s infinite cubic-bezier(0.24, 0, 0.38, 1);
  z-index: -1;
}

@keyframes sr-whatsapp-radiate {
  0% {
    transform: scale(0.96);
    opacity: 0.75;
  }
  65%, 100% {
    transform: scale(1.42);
    opacity: 0;
  }
}

/* Accessible Tooltip */
.sr-whatsapp-tooltip {
  position: absolute;
  right: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%) translateX(6px);
  background-color: var(--sr-navy-deep);
  color: #ffffff;
  padding: 6px 12px;
  border-radius: var(--sr-radius-sm);
  font-size: 0.785rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.2s cubic-bezier(0.16, 1, 0.3, 1),
              visibility 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 16px rgba(14, 23, 38, 0.28);
  border: 1px solid rgba(255, 255, 255, 0.14);
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.sr-whatsapp-tooltip::after {
  content: "";
  position: absolute;
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  border-width: 5px;
  border-style: solid;
  border-color: transparent transparent transparent var(--sr-navy-deep);
}

.sr-whatsapp-chat:hover .sr-whatsapp-tooltip {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) translateX(0);
}

.sr-whatsapp-status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #25d366;
  box-shadow: 0 0 6px #25d366;
}

/* Scroll To Top Floating Action Button */
.sr-back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background-color: var(--sr-navy-deep);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--sr-radius-md);
  box-shadow: 0 4px 14px rgba(14, 23, 38, 0.2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  z-index: 1010;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              visibility 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              bottom 0.25s ease,
              background-color 0.2s ease,
              border-color 0.2s ease,
              box-shadow 0.2s ease;
}

.sr-back-to-top:hover {
  background-color: var(--sr-copper);
  border-color: var(--sr-copper-light);
  color: #ffffff;
  box-shadow: 0 6px 18px rgba(197, 34, 31, 0.35);
  transform: translateY(-2px);
}

.sr-back-to-top:active {
  transform: translateY(0);
  background-color: var(--sr-copper-hover);
}

.sr-back-to-top:focus-visible {
  outline: 2px solid var(--sr-copper);
  outline-offset: 3px;
}

.sr-back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

/* Coordinated Stacking with WhatsApp Chat Button */
.sr-back-to-top.has-whatsapp {
  bottom: 84px;
  right: 27px; /* Center-aligns 44px button with 50px WhatsApp circle */
}

/* Coordinated Stacking with Copy Toast */
.sr-copy-toast.has-whatsapp {
  bottom: 140px;
}

@media (max-width: 576px) {
  .sr-whatsapp-chat {
    bottom: 16px;
    right: 16px;
    width: 44px;
    height: 44px;
  }
  .sr-whatsapp-icon {
    width: 24px;
    height: 24px;
  }
  .sr-whatsapp-tooltip {
    display: none;
  }
  .sr-back-to-top {
    bottom: 16px;
    right: 16px;
    width: 42px;
    height: 42px;
    font-size: 1rem;
  }
  .sr-back-to-top.has-whatsapp {
    bottom: 68px;
    right: 17px; /* Center-aligns 42px button with 44px WhatsApp circle */
  }
  .sr-copy-toast {
    bottom: 68px;
    right: 16px;
  }
  .sr-copy-toast.has-whatsapp {
    bottom: 118px;
    right: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sr-navbar,
  .sr-navbar.is-scrolled,
  .sr-back-to-top,
  .sr-whatsapp-chat,
  .sr-whatsapp-pulse,
  .sr-brand-logo-plate img {
    transition: none !important;
    animation: none !important;
  }
}

/* ==========================================================================
   CLIENT LOGOS HORIZONTAL SCROLLING MARQUEE
   Industrial, seamless infinite ticker with pause-on-hover & edge masks
   ========================================================================== */
.sr-client-ticker-section {
  position: relative;
  background-color: var(--sr-bg-white);
  border-bottom: 1px solid var(--sr-border-light);
  overflow: hidden;
  padding: 2.25rem 0 2.5rem 0;
}

.sr-marquee-wrapper {
  position: relative;
  width: 100%;
  overflow: hidden;
  display: flex;
  user-select: none;
  gap: 1.5rem;
  padding: 10px 0;
  mask-image: linear-gradient(to right, rgba(0,0,0,0) 0%, rgba(0,0,0,1) 8%, rgba(0,0,0,1) 92%, rgba(0,0,0,0) 100%);
  -webkit-mask-image: linear-gradient(to right, rgba(0,0,0,0) 0%, rgba(0,0,0,1) 8%, rgba(0,0,0,1) 92%, rgba(0,0,0,0) 100%);
}

.sr-marquee-track {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 1.5rem;
  animation: sr-marquee-scroll 28s linear infinite !important;
  will-change: transform;
}

.sr-marquee-wrapper:hover .sr-marquee-track {
  animation-play-state: paused !important;
}

@keyframes sr-marquee-scroll {
  0% {
    transform: translate3d(0, 0, 0);
  }
  100% {
    transform: translate3d(calc(-100% - 1.5rem), 0, 0);
  }
}

.sr-client-logo-card {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.75rem;
  background: var(--sr-bg-card);
  border: 1px solid var(--sr-border-light);
  border-radius: var(--sr-radius-md);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
  height: 76px;
  min-width: 190px;
  text-decoration: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  filter: grayscale(100%);
  opacity: 0.8;
}

.sr-client-logo-card:hover,
.sr-client-logo-card:focus-visible {
  filter: grayscale(0%);
  opacity: 1;
  border-color: var(--sr-copper);
  box-shadow: 0 6px 18px rgba(197, 34, 31, 0.14);
  transform: translateY(-2px);
  outline: none;
}

.sr-client-logo-img {
  max-height: 46px;
  max-width: 160px;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}

.sr-client-logo-fallback {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.sr-client-fallback-name {
  font-size: 0.925rem;
  font-weight: 700;
  color: var(--sr-navy-main);
  letter-spacing: 0.5px;
  line-height: 1.2;
}

.sr-client-fallback-sub {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--sr-copper);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

@media (max-width: 768px) {
  .sr-client-ticker-section {
    padding: 1.5rem 0 1.75rem 0;
  }
  .sr-marquee-wrapper {
    padding: 8px 0;
  }
  .sr-client-logo-card {
    height: 68px;
    min-width: 160px;
    padding: 0.65rem 1.25rem;
  }
  .sr-client-logo-img {
    max-height: 38px;
    max-width: 130px;
  }
  .sr-marquee-track {
    gap: 1rem;
    animation-duration: 24s;
  }
}


/* ==========================================================================
   Visual Media Enhancements & Photographic Mid-Sections
   ========================================================================== */

.sr-card-media-wrap {
  position: relative;
  overflow: hidden;
  background-color: var(--sr-bg-stone);
  border-bottom: 1px solid var(--sr-border-light);
}

.sr-card-media-wrap.ratio-16x9 {
  aspect-ratio: 16 / 9;
}

.sr-card-media-wrap.ratio-4x3 {
  aspect-ratio: 4 / 3;
}

.sr-service-card.has-media {
  padding: 0 !important;
  overflow: hidden;
}

.sr-service-card-body {
  padding: 1.5rem 1.75rem 1.75rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.sr-card-media-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.sr-service-card:hover .sr-card-media-img,
.sr-project-card:hover .sr-card-media-img {
  transform: scale(1.04);
}

.sr-card-media-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(180deg, rgba(14, 23, 38, 0.15) 0%, rgba(14, 23, 38, 0.5) 100%);
  pointer-events: none;
}

/* Photographic Mid-Section Visual Break */
.sr-visual-break {
  position: relative;
  background-size: cover;
  background-position: center center;
  background-attachment: scroll;
  color: #ffffff;
  padding: 5rem 0;
  overflow: hidden;
}

@media (min-width: 992px) {
  .sr-visual-break {
    padding: 6.5rem 0;
    background-attachment: fixed;
  }
}

.sr-visual-break-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(14, 23, 38, 0.94) 0%, rgba(25, 39, 66, 0.88) 100%);
  z-index: 1;
}

.sr-visual-break-content {
  position: relative;
  z-index: 2;
}

.sr-photo-montage {
  position: relative;
  border-radius: var(--sr-radius-lg);
  overflow: hidden;
  box-shadow: 0 16px 36px -8px rgba(15, 23, 42, 0.14);
  border: 1px solid var(--sr-border-light);
}

.sr-photo-montage-badge {
  position: absolute;
  bottom: 16px;
  right: 16px;
  background: rgba(14, 23, 38, 0.92);
  color: #ffffff;
  padding: 8px 16px;
  border-radius: var(--sr-radius-sm);
  border: 1px solid rgba(237, 28, 36, 0.5);
  font-family: var(--sr-font-mono);
  font-size: 0.785rem;
  letter-spacing: 0.5px;
  backdrop-filter: blur(8px);
}

.sr-stat-pill {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--sr-radius-md);
  padding: 1.25rem;
  backdrop-filter: blur(6px);
  transition: all 0.25s ease;
}

.sr-stat-pill:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--sr-copper);
}

/* ==========================================================================
   ENGINEERING PILLARS (WHY INDUSTRIAL GIANTS PARTNER WITH S.R. TECH)
   Architectural Capability Matrix with Technical Spec Ledgers
   ========================================================================== */
.sr-pillar-card {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--sr-bg-white);
  border: 1px solid var(--sr-border-light);
  border-radius: var(--sr-radius-md);
  padding: 1.65rem 1.45rem;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), 
              box-shadow 0.2s cubic-bezier(0.16, 1, 0.3, 1), 
              border-color 0.2s ease;
  overflow: hidden;
}

.sr-pillar-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--sr-brand-red);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.sr-pillar-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px -4px rgba(15, 23, 42, 0.09);
  border-color: var(--sr-border-medium);
}

.sr-pillar-card:hover::before {
  opacity: 1;
}

.sr-pillar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1.15rem;
}

.sr-pillar-code {
  font-family: var(--sr-font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--sr-brand-red);
  background: var(--sr-brand-red-subtle);
  border: 1px solid var(--sr-brand-red-border);
  padding: 3px 8px;
  border-radius: var(--sr-radius-sm);
}

.sr-pillar-icon-box {
  width: 42px;
  height: 42px;
  border-radius: var(--sr-radius-sm);
  background: var(--sr-bg-stone);
  border: 1px solid var(--sr-border-light);
  color: var(--sr-brand-red);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.sr-pillar-card:hover .sr-pillar-icon-box {
  background: var(--sr-navy-deep);
  color: #ffffff;
  border-color: var(--sr-navy-deep);
}

.sr-pillar-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--sr-text-heading);
  line-height: 1.35;
  margin-bottom: 0.65rem;
}

.sr-pillar-desc {
  font-size: 0.885rem;
  color: var(--sr-text-secondary);
  line-height: 1.62;
  margin-bottom: 1.25rem;
}

.sr-pillar-specs {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--sr-border-light);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.sr-pillar-chip {
  font-family: var(--sr-font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--sr-text-heading);
  background: var(--sr-bg-page);
  border: 1px solid var(--sr-border-light);
  padding: 3px 8px;
  border-radius: var(--sr-radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.sr-pillar-chip i {
  color: var(--sr-brand-red);
  font-size: 0.75rem;
}

.sr-pillar-footer {
  margin-top: 0.85rem;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--sr-text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.sr-pillar-footer i {
  color: #16a34a;
}

/* ==========================================================================
   PLANT LEADER ENDORSEMENTS (TRUSTED BY INDUSTRIAL PLANT LEADERS)
   Audited Commissioning Clearances & Executive Signatories
   ========================================================================== */
.sr-endorsement-card {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  background: #ffffff;
  border: 1px solid var(--sr-border-light);
  border-radius: var(--sr-radius-lg);
  padding: 1.85rem 1.65rem;
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.04);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), 
              box-shadow 0.2s cubic-bezier(0.16, 1, 0.3, 1), 
              border-color 0.2s ease;
}

.sr-endorsement-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 32px -6px rgba(15, 23, 42, 0.09);
  border-color: var(--sr-border-medium);
}

.sr-endorsement-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1.2rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--sr-border-light);
}

.sr-endorsement-facility-tag {
  font-family: var(--sr-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--sr-navy-main);
  background: var(--sr-bg-stone);
  border: 1px solid var(--sr-border-light);
  padding: 3px 8px;
  border-radius: var(--sr-radius-sm);
}

.sr-endorsement-quote-wrap {
  position: relative;
  margin-bottom: 1.25rem;
}

.sr-endorsement-quote {
  font-size: 1.015rem;
  font-weight: 450;
  line-height: 1.68;
  color: var(--sr-text-heading);
  margin-bottom: 0;
}

.sr-endorsement-scope-box {
  background: var(--sr-bg-page);
  border: 1px solid var(--sr-border-light);
  border-radius: var(--sr-radius-sm);
  padding: 0.75rem 1rem;
  margin-bottom: 1.35rem;
}

.sr-endorsement-scope-label {
  font-family: var(--sr-font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--sr-text-muted);
  display: block;
  margin-bottom: 2px;
}

.sr-endorsement-scope-value {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--sr-text-heading);
  display: flex;
  align-items: center;
  gap: 6px;
}

.sr-endorsement-scope-value i {
  color: var(--sr-brand-red);
}

.sr-endorsement-signatory {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--sr-border-light);
}

.sr-endorsement-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--sr-radius-sm);
  background: var(--sr-navy-deep);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--sr-font-mono);
  font-weight: 700;
  font-size: 0.875rem;
  border: 2px solid var(--sr-brand-red);
  flex-shrink: 0;
  letter-spacing: 0.5px;
}

.sr-endorsement-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--sr-text-heading);
  line-height: 1.25;
  margin-bottom: 1px;
}

.sr-endorsement-role {
  font-size: 0.785rem;
  color: var(--sr-text-secondary);
  line-height: 1.3;
}

.sr-endorsement-company {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--sr-brand-red);
  margin-top: 2px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.sr-trust-strip {
  background: var(--sr-bg-stone);
  border: 1px solid var(--sr-border-light);
  border-radius: var(--sr-radius-md);
  padding: 1.15rem 1.5rem;
  margin-top: 2.25rem;
}

.sr-trust-strip-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--sr-text-heading);
}

.sr-trust-strip-item i {
  color: var(--sr-brand-red);
  font-size: 1rem;
}