/* ==============================================================================
   PAUL BUSINESS SOLUTIONS (PBS) — MASTER DESIGN SYSTEM & STYLESHEET
   Brand Palette: Corporate Navy (#1C3C62), Midnight Navy (#102445),
   Cerulean Teal (#0097B2), Deep Teal (#006375), Bright Turquoise (#3CCDE6),
   Dark Charcoal (#1C2120), Cool Ice Grey (#F0F4F8), Pure White (#FFFFFF)
   Typography: Poppins (Google Fonts)
   ============================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400;1,600&display=swap');

:root {
  /* Brand Colours (Audit Confirmed) */
  --pbs-corporate-navy: #1c3c62;
  --pbs-midnight-navy: #102445;
  --pbs-deep-navy: #09172c;
  --pbs-cerulean-teal: #0097b2;
  --pbs-deep-teal: #006375;
  --pbs-bright-turquoise: #3ccde6;
  --pbs-ice-grey: #f0f4f8;
  --pbs-ice-grey-light: #f8fafc;
  --pbs-pure-white: #ffffff;
  --pbs-dark-charcoal: #1c2120;
  --pbs-slate-text: #475569;
  --pbs-slate-muted: #64748b;
  --pbs-border-color: #e2e8f0;
  --pbs-border-subtle: #cbd5e1;

  /* Accent & Status */
  --pbs-emerald: #059669;
  --pbs-amber: #d97706;
  --pbs-indigo: #4f46e5;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(16, 36, 69, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(16, 36, 69, 0.08), 0 2px 4px -2px rgba(16, 36, 69, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(16, 36, 69, 0.09), 0 4px 6px -4px rgba(16, 36, 69, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(16, 36, 69, 0.12), 0 8px 10px -6px rgba(16, 36, 69, 0.06);
  --shadow-glow: 0 0 20px rgba(0, 151, 178, 0.25);

  /* Layout */
  --container-max: 1240px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* CSS Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: 'Poppins', system-ui, -apple-system, sans-serif;
  color: var(--pbs-dark-charcoal);
  background-color: var(--pbs-ice-grey-light);
  line-height: 1.6;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body {
  overflow-x: hidden;
  width: 100%;
  position: relative;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ==============================================================================
   TYPOGRAPHY & UTILITIES
   ============================================================================== */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(0, 151, 178, 0.1);
  color: var(--pbs-deep-teal);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  border: 1px solid rgba(0, 151, 178, 0.25);
  margin-bottom: 0.85rem;
}

.section-tag.light {
  background: rgba(60, 205, 230, 0.15);
  color: var(--pbs-bright-turquoise);
  border-color: rgba(60, 205, 230, 0.3);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--pbs-midnight-navy);
  line-height: 1.25;
  margin-bottom: 1rem;
}

.section-title.light {
  color: var(--pbs-pure-white);
}

.section-lead {
  font-size: 1.05rem;
  color: var(--pbs-slate-text);
  max-width: 720px;
  margin-bottom: 2.5rem;
}

.section-lead.light {
  color: #cbd5e1;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.8rem 1.6rem;
  border-radius: var(--radius-md);
  transition: var(--transition);
  line-height: 1.2;
}

.btn-primary {
  background: linear-gradient(135deg, var(--pbs-cerulean-teal) 0%, var(--pbs-deep-teal) 100%);
  color: var(--pbs-pure-white);
  box-shadow: 0 4px 12px rgba(0, 151, 178, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0, 151, 178, 0.45);
  background: linear-gradient(135deg, #00a8c6 0%, #00778c 100%);
}

.btn-secondary {
  background: var(--pbs-pure-white);
  color: var(--pbs-corporate-navy);
  border: 1px solid var(--pbs-border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--pbs-cerulean-teal);
  color: var(--pbs-cerulean-teal);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-ghost-light {
  background: rgba(255, 255, 255, 0.1);
  color: var(--pbs-pure-white);
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
}

.btn-ghost-light:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: var(--pbs-bright-turquoise);
  color: var(--pbs-bright-turquoise);
  transform: translateY(-2px);
}

.btn-sm {
  font-size: 0.8rem;
  padding: 0.5rem 1rem;
}

/* ==============================================================================
   HEADER & NAVIGATION
   ============================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(16, 36, 69, 0.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition);
  height: 64px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 1rem;
}

.brand-identity {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  flex-shrink: 0;
  min-width: 0;
}

.brand-logo-img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  object-fit: contain;
  background: #ffffff;
  padding: 2px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  flex-shrink: 0;
}

.brand-text-block {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}

.brand-name {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--pbs-pure-white);
  letter-spacing: 0.03em;
  white-space: nowrap;
  line-height: 1.15;
}

.brand-tagline {
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--pbs-bright-turquoise);
  letter-spacing: 0.04em;
  white-space: nowrap;
  line-height: 1.2;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: #e2e8f0;
  transition: var(--transition);
  position: relative;
  padding: 0.3rem 0;
  white-space: nowrap;
}

.nav-link:hover, .nav-link:focus-visible {
  color: var(--pbs-bright-turquoise);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--pbs-bright-turquoise);
  transition: width 0.2s ease;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.btn-pdf-header {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.42rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--pbs-pure-white);
  background: rgba(0, 151, 178, 0.18);
  border: 1px solid rgba(60, 205, 230, 0.45);
  border-radius: 9999px;
  text-decoration: none;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-pdf-header:hover {
  background: rgba(0, 151, 178, 0.35);
  border-color: var(--pbs-bright-turquoise);
  color: var(--pbs-bright-turquoise);
  box-shadow: 0 0 12px rgba(60, 205, 230, 0.25);
}

.btn-return-website {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.42rem 0.95rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--pbs-pure-white);
  background: linear-gradient(135deg, var(--pbs-cerulean-teal) 0%, var(--pbs-deep-teal) 100%);
  border: 1px solid rgba(60, 205, 230, 0.4);
  border-radius: 9999px;
  text-decoration: none;
  transition: var(--transition);
  white-space: nowrap;
  box-shadow: 0 2px 10px rgba(0, 151, 178, 0.32);
}

.btn-return-website:hover {
  background: linear-gradient(135deg, #00a8c6 0%, #00778c 100%);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0, 151, 178, 0.5);
  color: var(--pbs-pure-white);
  border-color: var(--pbs-bright-turquoise);
}

.btn-return-website:active {
  transform: translateY(0);
  box-shadow: 0 2px 6px rgba(0, 151, 178, 0.3);
}

.btn-return-website:focus-visible {
  outline: 2px solid var(--pbs-bright-turquoise);
  outline-offset: 2px;
}

.btn-return-website svg {
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  flex-shrink: 0;
}

.btn-return-website:hover svg {
  transform: translateX(-3px);
}

.btn-return-website .btn-text-short {
  display: none;
}

.mobile-menu-btn {
  display: none;
  color: var(--pbs-pure-white);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  cursor: pointer;
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--pbs-midnight-navy);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  z-index: 99;
}

.mobile-drawer.open {
  transform: translateX(0);
}

.mobile-nav-link {
  color: var(--pbs-pure-white);
  font-size: 1.15rem;
  font-weight: 600;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* ==============================================================================
   HERO SECTION
   ============================================================================== */
.hero-section {
  position: relative;
  background: linear-gradient(135deg, var(--pbs-midnight-navy) 0%, var(--pbs-deep-navy) 60%, #061122 100%);
  color: var(--pbs-pure-white);
  padding: 5.5rem 0 4.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 151, 178, 0.18) 0%, rgba(60, 205, 230, 0.05) 50%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--pbs-bright-turquoise);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.25rem;
  background: rgba(60, 205, 230, 0.1);
  padding: 0.4rem 0.9rem;
  border-radius: 9999px;
  border: 1px solid rgba(60, 205, 230, 0.25);
}

.hero-title {
  font-size: 2.85rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero-title-highlight {
  background: linear-gradient(120deg, #3ccde6 0%, #0097b2 60%, #ffffff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: #94a3b8;
  line-height: 1.65;
  margin-bottom: 2.2rem;
  max-width: 620px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.8rem;
}

.hero-badges-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.hero-badge-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.hero-badge-num {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--pbs-bright-turquoise);
}

.hero-badge-desc {
  font-size: 0.78rem;
  color: #94a3b8;
  line-height: 1.35;
}

/* Hero Visual Showcase Card */
.hero-visual-card {
  position: relative;
  border-radius: var(--radius-xl);
  background: linear-gradient(145deg, rgba(28, 60, 98, 0.5) 0%, rgba(16, 36, 69, 0.7) 100%);
  border: 1px solid rgba(60, 205, 230, 0.25);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), var(--shadow-glow);
  padding: 1.5rem;
  overflow: hidden;
}

.hero-visual-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: #000;
}

.hero-visual-frame img {
  width: 100%;
  height: auto;
  transition: transform 0.4s ease;
}

.hero-visual-frame:hover img {
  transform: scale(1.02);
}

.hero-visual-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  padding-top: 0.8rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-visual-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--pbs-pure-white);
}

.hero-visual-tag {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--pbs-bright-turquoise);
  background: rgba(60, 205, 230, 0.15);
  padding: 0.25rem 0.6rem;
  border-radius: 9999px;
}

/* ==============================================================================
   SERVICES SECTION
   ============================================================================== */
.services-section {
  padding: 5rem 0;
  background: var(--pbs-pure-white);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.service-card {
  background: var(--pbs-ice-grey-light);
  border: 1px solid var(--pbs-border-color);
  border-radius: var(--radius-lg);
  padding: 2.2rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--pbs-corporate-navy), var(--pbs-cerulean-teal));
  opacity: 0;
  transition: opacity 0.2s ease;
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 151, 178, 0.4);
  box-shadow: var(--shadow-lg);
}

.service-card:hover::before {
  opacity: 1;
}

.service-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(0, 151, 178, 0.1);
  color: var(--pbs-deep-teal);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.4rem;
}

.service-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--pbs-midnight-navy);
  margin-bottom: 0.8rem;
}

.service-description {
  font-size: 0.9rem;
  color: var(--pbs-slate-text);
  line-height: 1.6;
  margin-bottom: 1.4rem;
  flex-grow: 1;
}

.service-feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.82rem;
  color: var(--pbs-dark-charcoal);
  border-top: 1px solid var(--pbs-border-color);
  padding-top: 1.2rem;
}

.service-feature-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.service-feature-item svg {
  color: var(--pbs-cerulean-teal);
  flex-shrink: 0;
}

/* ==============================================================================
   PROJECTS SECTION & FILTER
   ============================================================================== */
.projects-section {
  padding: 5.5rem 0;
  background: var(--pbs-ice-grey);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 2.5rem;
}

.filter-btn {
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: 9999px;
  background: var(--pbs-pure-white);
  color: var(--pbs-slate-text);
  border: 1px solid var(--pbs-border-color);
  transition: var(--transition);
}

.filter-btn:hover {
  border-color: var(--pbs-cerulean-teal);
  color: var(--pbs-midnight-navy);
}

.filter-btn.active {
  background: var(--pbs-midnight-navy);
  color: var(--pbs-pure-white);
  border-color: var(--pbs-midnight-navy);
  box-shadow: 0 4px 10px rgba(16, 36, 69, 0.2);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.2rem;
}

.project-card {
  background: var(--pbs-pure-white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--pbs-border-color);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(0, 151, 178, 0.4);
}

.project-card-media {
  position: relative;
  background: #0f172a;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-bottom: 1px solid var(--pbs-border-color);
  cursor: pointer;
}

.project-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  transition: transform 0.4s ease;
}

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

.media-badge-group {
  position: absolute;
  top: 1rem;
  left: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  z-index: 2;
}

.badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  backdrop-filter: blur(8px);
}

.badge-client {
  background: rgba(16, 36, 69, 0.85);
  color: var(--pbs-bright-turquoise);
  border: 1px solid rgba(60, 205, 230, 0.4);
}

.badge-demo {
  background: rgba(0, 151, 178, 0.85);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.badge-concept {
  background: rgba(79, 70, 229, 0.85);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.badge-synthetic {
  background: rgba(5, 150, 105, 0.85);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.media-expand-hint {
  position: absolute;
  bottom: 0.8rem;
  right: 0.8rem;
  background: rgba(16, 36, 69, 0.85);
  color: #ffffff;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  opacity: 0;
  transform: translateY(4px);
  transition: var(--transition);
}

.project-card-media:hover .media-expand-hint {
  opacity: 1;
  transform: translateY(0);
}

.project-card-body {
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-card-header {
  margin-bottom: 0.8rem;
}

.project-card-category {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--pbs-cerulean-teal);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.project-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--pbs-midnight-navy);
  line-height: 1.3;
}

.project-card-desc {
  font-size: 0.88rem;
  color: var(--pbs-slate-text);
  line-height: 1.6;
  margin-bottom: 1.3rem;
  flex-grow: 1;
}

.project-features-list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-bottom: 1.3rem;
  font-size: 0.82rem;
  color: var(--pbs-dark-charcoal);
  border-top: 1px dashed var(--pbs-border-color);
  padding-top: 1rem;
}

.project-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.45rem;
}

.project-feature-bullet {
  color: var(--pbs-cerulean-teal);
  font-weight: bold;
}

.project-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.4rem;
}

.tag-pill {
  font-size: 0.72rem;
  font-weight: 500;
  background: var(--pbs-ice-grey);
  color: var(--pbs-corporate-navy);
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  border: 1px solid var(--pbs-border-color);
}

.project-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--pbs-border-color);
  padding-top: 1rem;
  margin-top: auto;
}

.project-view-btn {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--pbs-cerulean-teal);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: gap 0.2s ease;
}

.project-view-btn:hover {
  color: var(--pbs-deep-teal);
  gap: 0.55rem;
}

.project-live-link {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--pbs-slate-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.project-live-link:hover {
  color: var(--pbs-corporate-navy);
}

/* ==============================================================================
   TECHNOLOGY & ENGINEERING INTEGRITY SECTION
   ============================================================================== */
.tech-section {
  padding: 5rem 0;
  background: var(--pbs-pure-white);
  border-top: 1px solid var(--pbs-border-color);
  border-bottom: 1px solid var(--pbs-border-color);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.8rem;
}

.tech-card {
  background: var(--pbs-ice-grey-light);
  border: 1px solid var(--pbs-border-color);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
}

.tech-card-header {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--pbs-midnight-navy);
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.tech-card-desc {
  font-size: 0.82rem;
  color: var(--pbs-slate-text);
  line-height: 1.5;
  margin-bottom: 1.2rem;
}

.tech-pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tech-pill {
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--pbs-pure-white);
  color: var(--pbs-corporate-navy);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--pbs-border-color);
}

/* Engineering Principles Banner */
.principles-banner {
  margin-top: 3.5rem;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--pbs-corporate-navy) 0%, var(--pbs-midnight-navy) 100%);
  color: var(--pbs-pure-white);
  padding: 2.8rem;
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 3rem;
  align-items: center;
}

.principles-title {
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1.3;
}

.principles-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.4rem;
  list-style: none;
}

.principle-item-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--pbs-bright-turquoise);
  margin-bottom: 0.25rem;
}

.principle-item-desc {
  font-size: 0.82rem;
  color: #cbd5e1;
  line-height: 1.45;
}

/* ==============================================================================
   ABOUT SECTION
   ============================================================================== */
.about-section {
  padding: 5.5rem 0;
  background: var(--pbs-ice-grey);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-quote {
  border-left: 4px solid var(--pbs-cerulean-teal);
  padding-left: 1.25rem;
  font-size: 1.15rem;
  font-style: italic;
  font-weight: 500;
  color: var(--pbs-corporate-navy);
  margin: 1.5rem 0;
  line-height: 1.6;
}

.about-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.about-stat-card {
  background: var(--pbs-pure-white);
  border: 1px solid var(--pbs-border-color);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  box-shadow: var(--shadow-sm);
}

.about-stat-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--pbs-midnight-navy);
  margin-bottom: 0.3rem;
}

.about-stat-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--pbs-cerulean-teal);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.3rem;
}

.about-stat-desc {
  font-size: 0.78rem;
  color: var(--pbs-slate-text);
  line-height: 1.4;
}

/* ==============================================================================
   CALL TO ACTION (CTA) SECTION
   ============================================================================== */
.cta-section {
  padding: 5.5rem 0;
  background: linear-gradient(180deg, var(--pbs-ice-grey-light) 0%, #e1ebf4 100%);
  border-top: 1px solid var(--pbs-border-color);
}

.cta-card {
  background: linear-gradient(135deg, var(--pbs-midnight-navy) 0%, var(--pbs-deep-navy) 60%, #061122 100%);
  color: var(--pbs-pure-white);
  border-radius: var(--radius-xl);
  padding: 4rem 3rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(60, 205, 230, 0.25);
}

.cta-card::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -20%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 151, 178, 0.25) 0%, rgba(60, 205, 230, 0.05) 50%, transparent 70%);
  pointer-events: none;
}

.cta-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(60, 205, 230, 0.15);
  color: var(--pbs-bright-turquoise);
  border: 1px solid rgba(60, 205, 230, 0.35);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.95rem;
  border-radius: 9999px;
  margin-bottom: 1.25rem;
}

.cta-title {
  font-size: 2.35rem;
  font-weight: 700;
  color: var(--pbs-pure-white);
  line-height: 1.2;
  margin-bottom: 1.1rem;
}

.cta-desc {
  font-size: 1.05rem;
  color: #cbd5e1;
  max-width: 640px;
  margin: 0 auto 2.2rem;
  line-height: 1.6;
}

.cta-btn-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.cta-main-btn {
  font-size: 1rem;
  padding: 0.9rem 2.2rem;
  box-shadow: 0 4px 18px rgba(0, 151, 178, 0.45);
}

.cta-footer-note {
  font-size: 0.78rem;
  color: #94a3b8;
  font-weight: 500;
}

/* ==============================================================================
   FOOTER
   ============================================================================== */
.site-footer {
  background: var(--pbs-midnight-navy);
  color: #94a3b8;
  padding: 4.5rem 0 2.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand-desc {
  font-size: 0.85rem;
  line-height: 1.6;
  margin-top: 1rem;
  color: #94a3b8;
}

.footer-col-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--pbs-pure-white);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.2rem;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.85rem;
}

.footer-links-list a {
  transition: color 0.2s ease;
}

.footer-links-list a:hover {
  color: var(--pbs-bright-turquoise);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: #64748b;
}

.footer-disclaimer {
  max-width: 650px;
  line-height: 1.5;
}

/* ==============================================================================
   MODAL / LIGHTBOX
   ============================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(10, 20, 36, 0.88);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-dialog {
  background: var(--pbs-pure-white);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 1080px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  transform: scale(0.96);
  transition: transform 0.25s ease;
}

.modal-overlay.active .modal-dialog {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 1.8rem;
  border-bottom: 1px solid var(--pbs-border-color);
  background: var(--pbs-ice-grey-light);
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--pbs-midnight-navy);
}

.modal-close-btn {
  font-size: 1.5rem;
  color: var(--pbs-slate-muted);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition);
}

.modal-close-btn:hover {
  background: var(--pbs-border-color);
  color: var(--pbs-dark-charcoal);
}

.modal-body {
  padding: 1.5rem 1.8rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.modal-screenshot-frame {
  background: #09172c;
  border-radius: var(--radius-md);
  border: 1px solid var(--pbs-border-color);
  overflow: hidden;
  display: flex;
  justify-content: center;
}

.modal-screenshot-frame img {
  width: 100%;
  height: auto;
  max-height: 58vh;
  object-fit: contain;
}

.modal-gallery-nav {
  display: flex;
  gap: 0.6rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.gallery-thumb {
  width: 90px;
  height: 56px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--pbs-border-color);
  overflow: hidden;
  cursor: pointer;
  flex-shrink: 0;
  opacity: 0.7;
  transition: var(--transition);
}

.gallery-thumb:hover, .gallery-thumb.active {
  border-color: var(--pbs-cerulean-teal);
  opacity: 1;
}

.gallery-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
}

.modal-meta-box {
  background: var(--pbs-ice-grey);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  font-size: 0.85rem;
  color: var(--pbs-slate-text);
  line-height: 1.5;
}

/* ==============================================================================
   RESPONSIVE MEDIA QUERIES
   ============================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .hero-visual-card {
    max-width: 600px;
    margin: 0 auto;
  }
  .services-grid {
    grid-template-columns: 1fr;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .principles-banner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 860px) {
  .desktop-nav {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.15rem;
  }
  .section-title {
    font-size: 1.85rem;
  }
  .hero-badges-row {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .tech-grid {
    grid-template-columns: 1fr;
  }
  .principles-list {
    grid-template-columns: 1fr;
  }
  .cta-card {
    padding: 2.75rem 1.5rem;
  }
  .cta-title {
    font-size: 1.85rem;
  }
  .cta-desc {
    font-size: 0.95rem;
  }
  .cta-btn-group {
    flex-direction: column;
    width: 100%;
  }
  .cta-btn-group .btn {
    width: 100%;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .header-inner {
    gap: 0.5rem;
  }
  .brand-logo-img {
    width: 32px;
    height: 32px;
  }
  .brand-name {
    font-size: 0.82rem;
  }
  .brand-tagline {
    font-size: 0.58rem;
  }
  .btn-pdf-header {
    padding: 0.35rem 0.65rem;
    font-size: 0.74rem;
  }
  .btn-return-website {
    padding: 0.35rem 0.75rem;
    font-size: 0.74rem;
    gap: 0.35rem;
  }
  .hero-title {
    font-size: 1.75rem;
  }
  .cta-title {
    font-size: 1.5rem;
  }
}

@media (max-width: 380px) {
  .btn-pdf-header {
    padding: 0.35rem 0.55rem;
  }
  .btn-pdf-header span {
    display: none;
  }
  .btn-return-website {
    padding: 0.35rem 0.65rem;
  }
}

@media (max-width: 330px) {
  .btn-return-website .btn-text-full {
    display: none;
  }
  .btn-return-website .btn-text-short {
    display: inline;
  }
}