/* ==========================================================================
   Sambomatic Systems & Embedded Engineering — Portfolio Design System
   Brand: Sambomatic
   Contact: usman@sambomatic.com | WhatsApp: +2348103453468
   Domain: sambomatic.com
   100% Client-Side Pure Front-End Architecture
   ========================================================================== */

:root {
  /* Refined International Color Palette */
  --bg-dark: #0a0f1d;
  --bg-card: rgba(15, 23, 42, 0.88);
  --bg-card-hover: rgba(23, 35, 60, 0.95);
  --bg-input: rgba(12, 19, 34, 0.95);
  --border-subtle: rgba(255, 255, 255, 0.12);
  --border-glow: rgba(0, 210, 255, 0.4);

  /* Warm & Vibrant Accents */
  --primary-cyan: #00d2ff;
  --secondary-teal: #3b82f6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-violet: #6366f1;
  --accent-rose: #ec4899;
  --whatsapp-green: #25D366;

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  /* Text Colors */
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;

  /* Shadow & Glow */
  --glow-cyan: 0 0 25px rgba(0, 210, 255, 0.35);
  --glow-emerald: 0 0 25px rgba(16, 185, 129, 0.35);
  --glow-whatsapp: 0 0 25px rgba(37, 211, 102, 0.45);
  --shadow-card: 0 15px 35px -10px rgba(0, 0, 0, 0.6);

  /* Radius & Transitions */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-dark);
  background-image: 
    radial-gradient(circle at 10% 10%, rgba(0, 210, 255, 0.09) 0%, transparent 45%),
    radial-gradient(circle at 90% 90%, rgba(99, 102, 241, 0.1) 0%, transparent 45%),
    radial-gradient(circle at 50% 50%, rgba(16, 185, 129, 0.05) 0%, transparent 60%);
  background-attachment: fixed;
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  width: 100%;
  -webkit-font-smoothing: antialiased;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Typography Utilities */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.text-gradient {
  background: linear-gradient(135deg, var(--primary-cyan) 0%, var(--secondary-teal) 50%, var(--accent-emerald) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-purple {
  background: linear-gradient(135deg, var(--accent-violet) 0%, #a855f7 50%, var(--primary-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* Header & Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1.1rem 0;
  transition: var(--transition);
  background: rgba(10, 15, 29, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.navbar.scrolled {
  padding: 0.75rem 0;
  background: rgba(10, 15, 29, 0.98);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.brand-logo-img {
  height: 38px;
  width: auto;
  max-width: 48px;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.6rem;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.35);
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-emerald);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.status-dot {
  width: 7px;
  height: 7px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.6; }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
  color: var(--primary-cyan);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1.25rem;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.mobile-nav-toggle:hover {
  border-color: var(--primary-cyan);
  color: var(--primary-cyan);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
  min-height: 44px;
}

.btn-primary {
  background: linear-gradient(135deg, #00d2ff 0%, #3b82f6 100%);
  color: #0a0f1d;
  box-shadow: var(--glow-cyan);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 35px rgba(0, 210, 255, 0.55);
}

.btn-whatsapp {
  background: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
  color: #ffffff;
  box-shadow: var(--glow-whatsapp);
}

.btn-whatsapp:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 35px rgba(37, 211, 102, 0.6);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border-color: var(--border-subtle);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--primary-cyan);
  color: var(--primary-cyan);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.45rem 1rem;
  font-size: 0.82rem;
  min-height: 38px;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.9rem 2rem;
  font-size: 1rem;
  min-height: 52px;
  border-radius: var(--radius-md);
}

/* Section Header */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3.5rem auto;
}

.section-tag {
  display: inline-block;
  padding: 0.3rem 0.9rem;
  background: rgba(0, 210, 255, 0.12);
  border: 1px solid rgba(0, 210, 255, 0.35);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary-cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.8rem;
}

.section-title {
  font-size: clamp(1.85rem, 4vw, 2.6rem);
  margin-bottom: 1rem;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: clamp(0.95rem, 2vw, 1.08rem);
}

/* Hero Section */
.hero {
  padding: clamp(7rem, 12vw, 9.5rem) 0 4.5rem 0;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-badge-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.hero-title {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  margin-bottom: 1.25rem;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 620px;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
  width: 100%;
}

.metrics-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  width: 100%;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
}

.metric-item {
  display: flex;
  flex-direction: column;
}

.metric-val {
  font-size: clamp(1.5rem, 3vw, 1.8rem);
  font-weight: 800;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.metric-lbl {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Hero Hardware Preview Card */
.hero-visual {
  position: relative;
  width: 100%;
}

.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  width: 100%;
}

.glass-card.glow-card {
  border-color: rgba(0, 210, 255, 0.3);
  box-shadow: 0 15px 40px -10px rgba(0, 210, 255, 0.2);
}

.glass-card:hover {
  border-color: rgba(0, 210, 255, 0.45);
}

.hardware-card-img {
  width: 100%;
  height: 270px;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 1.25rem;
}

.hardware-spec-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.hardware-spec-tag {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.hardware-spec-tag i {
  color: var(--primary-cyan);
}

/* Contact Banner Section */
.contact-banner-section {
  padding: 2rem 0;
}

.contact-banner-card {
  background: linear-gradient(135deg, rgba(0, 210, 255, 0.1) 0%, rgba(37, 211, 102, 0.1) 100%);
  border: 1px solid rgba(0, 210, 255, 0.35);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 4vw, 2.25rem) clamp(1.5rem, 5vw, 3rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

.contact-banner-title {
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  margin-bottom: 0.4rem;
  color: var(--text-primary);
}

.contact-banner-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.contact-banner-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Engineering Divisions Section */
.divisions-section {
  padding: clamp(4rem, 8vw, 5.5rem) 0;
}

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

.division-card {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.division-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-cyan), var(--secondary-teal));
}

.division-card.embedded::before {
  background: linear-gradient(90deg, var(--accent-emerald), var(--accent-amber));
}

.division-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(0, 210, 255, 0.12);
  border: 1px solid rgba(0, 210, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary-cyan);
  margin-bottom: 1.5rem;
}

.division-card.embedded .division-icon {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.3);
  color: var(--accent-emerald);
}

.division-title {
  font-size: clamp(1.3rem, 3vw, 1.6rem);
  margin-bottom: 0.75rem;
}

.division-desc {
  color: var(--text-secondary);
  font-size: 0.98rem;
  margin-bottom: 1.5rem;
}

.capability-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: auto;
}

.capability-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.capability-item i {
  color: var(--accent-emerald);
  margin-top: 0.2rem;
  font-size: 0.85rem;
}

/* Featured Projects Section */
.projects-section {
  padding: clamp(4rem, 8vw, 5.5rem) 0;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary-cyan);
  box-shadow: var(--shadow-card);
}

.project-img-wrapper {
  position: relative;
  height: 210px;
  overflow: hidden;
  width: 100%;
}

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover .project-img {
  transform: scale(1.05);
}

.project-tag {
  position: absolute;
  top: 1rem;
  left: 1rem;
  padding: 0.3rem 0.75rem;
  background: rgba(10, 15, 29, 0.9);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-full);
  font-size: 0.73rem;
  font-weight: 700;
  color: var(--accent-emerald);
}

.project-content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-title {
  font-size: 1.28rem;
  margin-bottom: 0.6rem;
}

.project-desc {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 1.25rem;
  line-height: 1.55;
}

.project-tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: auto;
  margin-bottom: 1.25rem;
}

.p-tag {
  padding: 0.2rem 0.55rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

/* Tech Stack Matrix */
.matrix-section {
  padding: clamp(4rem, 8vw, 5.5rem) 0;
}

.matrix-filter-tabs {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 0.55rem 1.15rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover, .tab-btn.active {
  background: rgba(0, 210, 255, 0.15);
  border-color: var(--primary-cyan);
  color: var(--primary-cyan);
}

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
}

.tech-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: var(--transition);
}

.tech-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: 0 10px 25px -5px rgba(0, 210, 255, 0.25);
}

.tech-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--primary-cyan);
  flex-shrink: 0;
}

.tech-info {
  display: flex;
  flex-direction: column;
}

.tech-name {
  font-weight: 700;
  font-size: 0.95rem;
}

.tech-cat {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Clean Contact Box Module */
.builder-section {
  padding: clamp(4rem, 8vw, 5.5rem) 0;
}

.contact-box-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: clamp(1.75rem, 4vw, 3rem);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.contact-info-panel, .contact-action-panel {
  display: flex;
  flex-direction: column;
}

.contact-detail-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  margin-bottom: 0.85rem;
}

.contact-detail-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: rgba(0, 210, 255, 0.12);
  border: 1px solid rgba(0, 210, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--primary-cyan);
  flex-shrink: 0;
}

.contact-detail-lbl {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.contact-detail-val {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

/* Floating WhatsApp Button */
.whatsapp-float {
  position: fixed;
  bottom: 1.75rem;
  right: 1.75rem;
  z-index: 999;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
  color: #ffffff;
  padding: 0.8rem 1.35rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.92rem;
  box-shadow: 0 10px 30px rgba(37, 211, 102, 0.45);
  transition: var(--transition);
}

.whatsapp-float i {
  font-size: 1.5rem;
}

.whatsapp-float:hover {
  transform: scale(1.05) translateY(-3px);
  box-shadow: 0 15px 40px rgba(37, 211, 102, 0.6);
}

/* Footer */
.footer {
  padding: 4rem 0 2rem 0;
  background: #050812;
  border-top: 1px solid var(--border-subtle);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 992px) {
  .hero-grid, .divisions-grid, .contact-box-wrapper, .footer-grid, .contact-banner-card {
    grid-template-columns: 1fr;
  }
  .contact-banner-card {
    text-align: center;
    flex-direction: column;
    padding: 2rem 1.5rem;
  }
  .contact-banner-buttons {
    justify-content: center;
    width: 100%;
  }
  .hero-cta { flex-direction: column; width: 100%; }
  .hero-cta .btn { width: 100%; }
}

@media (max-width: 768px) {
  .mobile-nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 15, 29, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.25rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.8);
  }
  .nav-links.active {
    display: flex;
  }
  .nav-actions { display: none; }
  .metrics-bar { grid-template-columns: 1fr; gap: 1rem; text-align: center; }
  .projects-grid { grid-template-columns: 1fr; }
  .whatsapp-float-text { display: none; }
  .whatsapp-float { padding: 0.8rem; border-radius: 50%; width: 52px; height: 52px; justify-content: center; bottom: 1.25rem; right: 1.25rem; }
  .hardware-spec-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .container { padding: 0 1rem; }
  .btn { width: 100%; }
  .hardware-card-img { height: 210px; }
  .contact-banner-buttons .btn { width: 100%; }
}