:root {
  /* Strict Minimalist Color Palette: Deep Black, Steely Grays, Electric Blue */
  --bg-primary: #05070a;
  --bg-secondary: #0c0f17;
  --bg-surface: #131722;
  --bg-surface-elevated: #1a2030;
  --bg-card: #0a0d14;
  --bg-card-hover: #101420;

  /* Blue Accents Only */
  --accent-blue: #0284c7;
  --accent-cyan: #38bdf8;
  --accent-blue-bright: #60a5fa;
  --accent-blue-glow: rgba(56, 189, 248, 0.25);
  --gradient-main: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  --gradient-hover: linear-gradient(135deg, #0369a1 0%, #0284c7 100%);

  /* Gray Tones & Ultra-Fine Clean Borders */
  --border-subtle: #1e2433;
  --border-hover: #334155;
  --border-active: #0284c7;
  --border-blue: rgba(56, 189, 248, 0.35);

  /* Clean Gray Typography Hierarchy */
  --text-main: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-dark: #475569;
  --font-ubuntu: 'Ubuntu', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'Ubuntu Mono', ui-monospace, monospace;

  /* Sleek, Sharp Geometry */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --radius-pill: 9999px;

  /* Fast, Clean Transitions */
  --transition-fast: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 14px;
  background-color: var(--bg-primary);
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-ubuntu);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

/* Subtle Slate-Blue Atmospheric Lighting */
.ambient-glow-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.glow-bubble-1 {
  position: absolute;
  top: -100px;
  right: -50px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(2, 132, 199, 0.08) 0%, transparent 65%);
  filter: blur(80px);
}

.glow-bubble-2 {
  position: absolute;
  bottom: 0;
  left: -100px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(148, 163, 184, 0.05) 0%, transparent 65%);
  filter: blur(90px);
}

/* Full Width Container */
.full-container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
  position: relative;
  z-index: 1;
}

/* Header */
.site-header {
  background: rgba(8, 11, 18, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
}

.brand-badge {
  background: var(--accent-blue);
  color: #ffffff;
  font-weight: 700;
  font-size: 1.05rem;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xs);
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 0 10px rgba(2, 132, 199, 0.3);
  transition: var(--transition-fast);
}

.brand-link:hover .brand-badge {
  background: var(--accent-cyan);
  color: #000;
}

.brand-text h1 {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

.brand-text span {
  font-size: 0.68rem;
  color: var(--text-secondary);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* Navigation Tabs: Sleek Blue & Charcoal Gray */
.nav-tabs {
  display: flex;
  gap: 3px;
  background: var(--bg-secondary);
  padding: 4px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.tab-btn {
  background: transparent;
  color: var(--text-secondary);
  border: none;
  padding: 0.45rem 0.95rem;
  font-size: 0.82rem;
  font-weight: 500;
  font-family: var(--font-ubuntu);
  cursor: pointer;
  border-radius: var(--radius-xs);
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.tab-btn i {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.tab-btn:hover {
  color: var(--text-main);
  background: var(--bg-surface);
}

.tab-btn:hover i {
  color: var(--accent-cyan);
}

.tab-btn.active {
  background: var(--accent-blue);
  color: #ffffff;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.35);
}

.tab-btn.active i {
  color: #ffffff;
}

/* Tab Sections */
main {
  flex: 1;
}

.tab-section {
  display: none;
  padding: 2.5rem 0 4rem;
}

.tab-section.active {
  display: block;
  animation: crispFade 0.2s ease-out;
}

@keyframes crispFade {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Sleek Intro Hero Panel: Black, Gray, and Blue Accent */
.interactive-hero-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--accent-blue);
  border-radius: var(--radius-md);
  padding: 2.75rem 2.5rem;
  margin-bottom: 2rem;
  position: relative;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  transition: var(--transition-fast);
}

.interactive-hero-panel:hover {
  border-color: var(--border-hover);
  border-left-color: var(--accent-cyan);
}

.hero-pill-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid var(--border-blue);
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-xs);
  margin-bottom: 1.25rem;
}

.interactive-hero-panel h2 {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.2;
  color: #ffffff;
  margin-bottom: 0.85rem;
  letter-spacing: -0.01em;
}

.interactive-hero-panel p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 780px;
  margin-bottom: 2rem;
}

.hero-actions-cluster {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
}

/* Sleek Buttons */
.interactive-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: var(--font-ubuntu);
  text-decoration: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: var(--transition-fast);
}

.interactive-btn i {
  font-size: 0.85rem;
}

.interactive-btn-primary {
  background: var(--accent-blue);
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(2, 132, 199, 0.3);
}

.interactive-btn-primary:hover {
  background: #0369a1;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.4);
}

.interactive-btn-gray {
  background: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.interactive-btn-gray:hover {
  background: var(--bg-surface-elevated);
  border-color: var(--border-hover);
  color: var(--accent-cyan);
  transform: translateY(-1px);
}

.interactive-btn-glass {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.interactive-btn-glass:hover {
  background: var(--bg-surface);
  border-color: var(--border-hover);
  color: var(--text-main);
  transform: translateY(-1px);
}

/* Social Pills Bar */
.social-pills-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
}

.interactive-social-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition-fast);
}

.interactive-social-pill:hover {
  color: var(--text-main);
  background: var(--bg-surface-elevated);
  border-color: var(--accent-blue);
  transform: translateY(-1px);
}

.interactive-social-pill i {
  color: var(--accent-cyan);
}

/* Section Header Bar */
.section-header-bar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.section-header-bar h2 {
  font-size: 1.8rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.01em;
}

.section-header-bar p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 0.2rem;
}

/* 4-Column Grid for Products */
.cards-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

@media (max-width: 1200px) {
  .cards-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 680px) {
  .cards-grid-4 {
    grid-template-columns: 1fr;
  }
}

.interactive-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.85rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-fast);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  position: relative;
}

.interactive-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}

.card-pill-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-xs);
  padding: 0.25rem 0.65rem;
  margin-bottom: 0.95rem;
}

.interactive-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: #ffffff;
}

.interactive-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
  margin-bottom: 1.4rem;
  flex-grow: 1;
}

/* Feature Spec List */
.feature-checklist {
  list-style: none;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1rem;
  margin-bottom: 1.4rem;
}

.feature-checklist li {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 0.45rem;
}

.feature-checklist li i {
  color: var(--accent-cyan);
  font-size: 0.75rem;
}

/* Placeholder Box */
.clean-placeholder-box {
  background: var(--bg-secondary);
  border: 1px dashed var(--border-hover);
  border-radius: var(--radius-sm);
  padding: 1.5rem 1.75rem;
  margin-top: 1.75rem;
}

.clean-placeholder-box h4 {
  color: var(--accent-cyan);
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.clean-placeholder-box p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* About Me */
.about-hero-grid {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 2.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-top: 3px solid var(--accent-blue);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  margin-bottom: 2rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  position: relative;
}

.about-profile-col {
  text-align: center;
}

.profile-avatar-frame {
  width: 170px;
  height: 170px;
  margin: 0 auto 1.25rem;
  background: var(--bg-surface);
  border: 2px solid var(--accent-blue);
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 16px rgba(2, 132, 199, 0.25);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.profile-avatar-frame:hover {
  border-color: var(--accent-cyan);
  transform: scale(1.02);
}

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

.profile-name {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
  color: #ffffff;
}

.profile-pen-name {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1.25rem;
}

.about-bio-col h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: #ffffff;
}

.about-bio-col p {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1rem;
}

/* Contact Tab */
.contact-container {
  max-width: 760px;
  margin: 0 auto;
}

.contact-info-top-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--accent-blue);
  border-radius: var(--radius-md);
  padding: 1.85rem 2.25rem;
  margin-bottom: 1.75rem;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.contact-info-top-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
  color: #ffffff;
}

.contact-info-top-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.35rem;
}

.contact-details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.25rem;
}

.contact-detail-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.contact-icon-box {
  width: 36px;
  height: 36px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

.contact-detail-item:hover .contact-icon-box {
  background: var(--accent-blue);
  color: #ffffff;
  border-color: var(--accent-blue);
}

.contact-detail-item div span {
  display: block;
  font-size: 0.68rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.contact-detail-item div a, .contact-detail-item div strong {
  font-size: 0.88rem;
  color: var(--text-main);
  text-decoration: none;
  font-weight: 500;
}

.contact-detail-item div a:hover {
  color: var(--accent-cyan);
}

.contact-form-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-top: 3px solid var(--accent-blue);
  border-radius: var(--radius-md);
  padding: 2.25rem 2.25rem;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.25);
}

.contact-form-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
  color: #ffffff;
}

.contact-form-card p {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 1.75rem;
}

.form-group {
  margin-bottom: 1.35rem;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.45rem;
  letter-spacing: 0.01em;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1.1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  color: var(--text-main);
  font-family: var(--font-ubuntu);
  font-size: 0.92rem;
  transition: var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-blue);
  background: var(--bg-surface-elevated);
  box-shadow: 0 0 0 2px rgba(2, 132, 199, 0.2);
}

/* Site Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 2rem 0;
  margin-top: auto;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.82rem;
  text-decoration: none;
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent-cyan);
}

/* Responsive */
@media (max-width: 860px) {
  .full-container {
    padding: 0 1.25rem;
  }
  .interactive-hero-panel {
    padding: 2rem 1.5rem;
  }
  .interactive-hero-panel h2 {
    font-size: 1.85rem;
  }
  .about-hero-grid {
    grid-template-columns: 1fr;
    padding: 1.85rem 1.5rem;
    gap: 2rem;
  }
  .nav-tabs {
    flex-wrap: wrap;
  }
  .tab-btn {
    flex: 1 1 auto;
    padding: 0.5rem 0.75rem;
    font-size: 0.78rem;
  }
}