/* ==========================================================================
   SYED MUHAMMAD WAQAR UL HASSAN - PREMIUM PERSONAL PORTFOLIO STYLESHEET
   Dark Slate / Cyber Cyan Theme - Engineered for Trust, Depth & High Conversion
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. DESIGN SYSTEM & CSS VARIABLES
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Dark Obsidian / Cyber Cyan / Slate Accent */
  --bg-darker: #060913;
  --bg-main: #0B0F19;
  --bg-card: #111827;
  --bg-card-hover: #162032;
  --bg-elevated: #1E293B;
  --bg-glass: rgba(17, 24, 39, 0.75);
  --bg-glass-border: rgba(255, 255, 255, 0.08);

  /* Primary Cyber Accents */
  --cyan-primary: #00F2FE;
  --cyan-secondary: #4FACFE;
  --blue-accent: #38BDF8;
  --blue-dark: #0284C7;
  --teal-accent: #14B8A6;
  
  /* Text & Neutral Hierarchy */
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --text-inverse: #0F172A;

  /* Status & Highlights */
  --accent-gold: #F59E0B;
  --accent-green: #10B981;
  --accent-purple: #8B5CF6;

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

  /* Shadows & Glows */
  --glow-cyan: 0 0 25px rgba(0, 242, 254, 0.25);
  --glow-cyan-strong: 0 0 40px rgba(0, 242, 254, 0.4);
  --glow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.3);

  /* Layout & Spacing */
  --container-max: 1240px;
  --nav-height: 80px;
  --border-radius-sm: 8px;
  --border-radius-md: 14px;
  --border-radius-lg: 20px;
  --border-radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --------------------------------------------------------------------------
   2. BASE RESET & GLOBAL STYLES
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-darker);
}
::-webkit-scrollbar-thumb {
  background: #1E293B;
  border-radius: 5px;
  border: 2px solid var(--bg-darker);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--blue-dark);
}

/* Selection */
::selection {
  background: rgba(0, 242, 254, 0.3);
  color: var(--text-primary);
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

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

a:hover {
  color: var(--cyan-primary);
}

p {
  color: var(--text-secondary);
}

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

ul {
  list-style: none;
}

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

.section-padding {
  padding: 6rem 0;
}

/* Text Gradients */
.text-gradient {
  background: linear-gradient(135deg, #FFFFFF 0%, var(--cyan-primary) 50%, var(--cyan-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.text-cyan {
  color: var(--cyan-primary);
}

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

/* --------------------------------------------------------------------------
   3. REUSABLE COMPONENTS & BUTTONS
   -------------------------------------------------------------------------- */
/* Section Titles */
.section-header {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 4rem auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.25);
  border-radius: var(--border-radius-full);
  color: var(--cyan-primary);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 0.85rem 1.75rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--border-radius-md);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan-primary) 0%, var(--blue-dark) 100%);
  color: var(--text-inverse);
  box-shadow: 0 4px 20px rgba(0, 242, 254, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-cyan-strong);
  color: var(--text-inverse);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border-color: var(--bg-glass-border);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(0, 242, 254, 0.4);
  color: var(--cyan-primary);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--cyan-primary);
  border-color: var(--cyan-primary);
}

.btn-outline:hover {
  background: rgba(0, 242, 254, 0.1);
  box-shadow: var(--glow-cyan);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--border-radius-full);
}

/* Glass Card */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.glass-card:hover {
  border-color: rgba(0, 242, 254, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--glow-card);
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan-primary), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

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

/* Badges & Tags */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.8rem;
  border-radius: var(--border-radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  background: rgba(0, 242, 254, 0.08);
  color: var(--text-primary);
  border: 1px solid rgba(0, 242, 254, 0.25);
}

.badge-cyan {
  background: rgba(0, 242, 254, 0.1);
  color: var(--cyan-primary);
  border-color: rgba(0, 242, 254, 0.25);
}

.badge-green {
  background: rgba(16, 185, 129, 0.1);
  color: var(--accent-green);
  border-color: rgba(16, 185, 129, 0.25);
}

.badge-purple {
  background: rgba(139, 92, 246, 0.1);
  color: var(--accent-purple);
  border-color: rgba(139, 92, 246, 0.25);
}

/* --------------------------------------------------------------------------
   4. NAVIGATION BAR
   -------------------------------------------------------------------------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 1000;
  transition: all var(--transition-normal);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--bg-glass-border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1rem;
  flex-wrap: nowrap;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  white-space: nowrap;
  flex-shrink: 0;
}

.brand-logo .logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--cyan-primary), var(--blue-dark));
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-inverse);
  font-weight: 900;
  font-size: 1.1rem;
  box-shadow: var(--glow-cyan);
  flex-shrink: 0;
}

.brand-name {
  white-space: nowrap;
  display: inline-block;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
  white-space: nowrap;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.875rem;
  position: relative;
  padding: 0.4rem 0;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

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

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

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

.mobile-social-row {
  display: none !important;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
  white-space: nowrap;
}

.nav-actions .btn {
  width: auto !important;
  padding: 0.5rem 1rem;
  font-size: 0.825rem;
  line-height: 1.2;
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  font-size: 1.35rem;
  cursor: pointer;
  padding: 0.4rem 0.6rem;
  transition: all var(--transition-fast);
}

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

/* --------------------------------------------------------------------------
   5. HERO SECTION
   -------------------------------------------------------------------------- */
.hero-section {
  position: relative;
  min-height: 100vh;
  padding-top: calc(var(--nav-height) + 3rem);
  padding-bottom: 5rem;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: radial-gradient(circle at 70% 20%, rgba(0, 242, 254, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 20% 80%, rgba(56, 189, 248, 0.05) 0%, transparent 40%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
  align-items: center;
}

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

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 1rem;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--border-radius-full);
  color: var(--accent-green);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-green);
  animation: pulse-green 2s infinite;
}

@keyframes pulse-green {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-name {
  font-size: clamp(2.5rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 0.75rem;
  letter-spacing: -0.03em;
}

.hero-roles {
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  color: var(--cyan-primary);
  font-weight: 600;
  margin-bottom: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
}

.hero-roles span.divider {
  color: var(--text-muted);
  font-weight: 300;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 680px;
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-bottom: 3.5rem;
}

/* Quick Metrics Bar */
.metrics-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--bg-glass-border);
  align-items: stretch;
}

.metric-item {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  height: 100%;
}

.metric-number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 0.35rem;
}

.metric-label {
  font-size: 0.825rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Hero Code Visual Card */
.hero-visual {
  position: relative;
}

.terminal-card {
  background: #090D16;
  border: 1px solid rgba(0, 242, 254, 0.2);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), var(--glow-cyan);
}

.terminal-header {
  background: #0E1422;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--bg-glass-border);
}

.terminal-dots {
  display: flex;
  gap: 0.4rem;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-red { background: #FF5F56; }
.dot-yellow { background: #FFBD2E; }
.dot-green { background: #27C93F; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.terminal-body {
  padding: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.code-keyword { color: #F472B6; }
.code-function { color: #38BDF8; }
.code-string { color: #A7F3D0; }
.code-var { color: #FBBF24; }
.code-comment { color: #64748B; font-style: italic; }

.verified-badge-floating {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background: var(--bg-card);
  border: 1px solid var(--cyan-primary);
  border-radius: var(--border-radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  backdrop-filter: blur(10px);
}

.verified-badge-floating i {
  font-size: 2rem;
  color: var(--cyan-primary);
}

.verified-badge-text h4 {
  font-size: 0.9rem;
  color: var(--text-primary);
}
.verified-badge-text p {
  font-size: 0.775rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   6. TRUST & CREDIBILITY STRIP
   -------------------------------------------------------------------------- */
.trust-strip-section {
  background: var(--bg-darker);
  padding: 2.5rem 0;
  border-y: 1px solid var(--bg-glass-border);
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
  align-items: stretch;
}

.trust-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--border-radius-md);
  height: 100%;
}

.trust-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius-sm);
  background: rgba(0, 242, 254, 0.1);
  color: var(--cyan-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  flex-shrink: 0;
}

.trust-info h4 {
  font-size: 0.95rem;
  margin-bottom: 0.2rem;
}

.trust-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   7. ABOUT ME SECTION
   -------------------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
  align-items: stretch;
}

.highlight-box {
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--border-radius-md);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  height: 100%;
}

.highlight-box i {
  font-size: 1.5rem;
  color: var(--cyan-primary);
  margin-bottom: 0.5rem;
}

.highlight-box h4 {
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.highlight-box p {
  font-size: 0.825rem;
}

/* --------------------------------------------------------------------------
   8. EXPERIENCE TIMELINE SECTION
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 20px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan-primary) 0%, var(--blue-dark) 50%, transparent 100%);
}

@media (min-width: 769px) {
  .timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }
}

.timeline-item {
  position: relative;
  margin-bottom: 3rem;
}

.timeline-dot {
  position: absolute;
  top: 24px;
  left: 20px;
  transform: translateX(-50%);
  width: 16px;
  height: 16px;
  background: var(--bg-main);
  border: 3px solid var(--cyan-primary);
  border-radius: 50%;
  box-shadow: var(--glow-cyan);
  z-index: 10;
}

@media (min-width: 769px) {
  .timeline-dot {
    left: 50%;
  }
}

.timeline-content {
  position: relative;
  width: calc(100% - 50px);
  margin-left: 50px;
}

@media (min-width: 769px) {
  .timeline-content {
    width: calc(50% - 40px);
    margin-left: 0;
  }
  
  .timeline-item:nth-child(even) .timeline-content {
    margin-left: auto;
  }
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--border-radius-lg);
  padding: 1.75rem;
  transition: all var(--transition-normal);
}

.timeline-card:hover {
  border-color: rgba(0, 242, 254, 0.3);
  transform: translateY(-3px);
  box-shadow: var(--glow-card);
}

.timeline-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.timeline-period {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan-primary);
  background: rgba(0, 242, 254, 0.1);
  padding: 0.2rem 0.6rem;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
}

.timeline-location {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.timeline-role {
  font-size: 1.2rem;
  margin-bottom: 0.25rem;
}

.timeline-company {
  font-size: 0.95rem;
  color: var(--blue-accent);
  margin-bottom: 1rem;
  font-weight: 500;
}

.timeline-bullets {
  margin-bottom: 1.25rem;
}

.timeline-bullets li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.5rem;
  font-size: 0.925rem;
  color: var(--text-secondary);
}

.timeline-bullets li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--cyan-primary);
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* --------------------------------------------------------------------------
   9. SERVICES SECTION
   -------------------------------------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.service-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.service-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: var(--border-radius-md);
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.15), rgba(2, 132, 199, 0.15));
  border: 1px solid rgba(0, 242, 254, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: var(--cyan-primary);
  margin-bottom: 1.5rem;
}

.service-title {
  font-size: 1.3rem;
  margin-bottom: 0.85rem;
}

.service-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.service-features {
  margin-bottom: 1.5rem;
}

.service-features li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.service-features li i {
  color: var(--accent-green);
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   10. SKILLS & TECHNICAL STACK
   -------------------------------------------------------------------------- */
.skills-tabs {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.tab-btn {
  padding: 0.65rem 1.4rem;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--border-radius-full);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn:hover,
.tab-btn.active {
  background: rgba(0, 242, 254, 0.15);
  color: var(--cyan-primary);
  border-color: rgba(0, 242, 254, 0.4);
  box-shadow: var(--glow-cyan);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  align-items: stretch;
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--border-radius-md);
  padding: 1.5rem;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.skill-card.is-hidden {
  display: none !important;
}

.skill-card:hover {
  border-color: rgba(0, 242, 254, 0.45);
  transform: translateY(-4px);
  box-shadow: var(--shadow-subtle);
}

.skill-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1rem;
}

.skill-header i {
  font-size: 1.5rem;
  color: var(--cyan-primary);
}

.skill-header h4 {
  font-size: 1.05rem;
}

.skill-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* --------------------------------------------------------------------------
   11. EDUCATION & RESEARCH SECTION
   -------------------------------------------------------------------------- */
.edu-research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.edu-card {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 2rem;
  border-left: 2px solid var(--cyan-primary);
}

.edu-degree {
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

.edu-institution {
  font-size: 0.95rem;
  color: var(--blue-accent);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.edu-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.thesis-box {
  background: var(--bg-darker);
  border: 1px dashed rgba(0, 242, 254, 0.3);
  border-radius: var(--border-radius-md);
  padding: 1.25rem;
  margin-top: 1rem;
}

.thesis-box h5 {
  font-size: 0.85rem;
  color: var(--cyan-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}

.thesis-box p {
  font-size: 0.875rem;
  font-style: italic;
}

/* --------------------------------------------------------------------------
   12. CERTIFICATIONS SHOWCASE
   -------------------------------------------------------------------------- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.cert-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-normal);
}

.cert-card:hover {
  border-color: rgba(0, 242, 254, 0.3);
  transform: translateY(-3px);
}

.cert-badge-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--border-radius-sm);
  background: rgba(0, 242, 254, 0.1);
  color: var(--cyan-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.cert-info h4 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.cert-issuer {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.cert-date {
  font-family: var(--font-mono);
  font-size: 0.775rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   13. CONTACT SECTION
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 4rem;
  align-items: start;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 2rem;
}

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

.contact-item:hover {
  border-color: rgba(0, 242, 254, 0.3);
}

.contact-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--border-radius-sm);
  background: rgba(0, 242, 254, 0.1);
  color: var(--cyan-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.contact-text label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.contact-text span {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Form Elements */
.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--border-radius-lg);
  padding: 2.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.form-control {
  width: 100%;
  padding: 0.9rem 1.1rem;
  background: var(--bg-main);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--border-radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--cyan-primary);
  box-shadow: 0 0 15px rgba(0, 242, 254, 0.2);
}

textarea.form-control {
  resize: vertical;
  min-height: 140px;
}

/* --------------------------------------------------------------------------
   14. FOOTER & MODALS
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--bg-darker);
  padding: 3rem 0;
  border-top: 1px solid var(--bg-glass-border);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-copy {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-full);
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all var(--transition-fast);
}

.social-btn:hover {
  background: rgba(0, 242, 254, 0.1);
  color: var(--cyan-primary);
  border-color: var(--cyan-primary);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   15. ANIMATIONS & REVEALS
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   16. EXECUTIVE PORTRAIT & IMAGE STYLING
   -------------------------------------------------------------------------- */
.profile-avatar-frame {
  position: relative;
  width: 100%;
  max-width: 440px;
  margin: 0 auto;
  border-radius: var(--border-radius-lg);
  padding: 8px;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.4), rgba(2, 132, 199, 0.1), rgba(0, 242, 254, 0.2));
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5), var(--glow-cyan);
  transition: transform var(--transition-normal);
}

.profile-avatar-frame:hover {
  transform: translateY(-4px);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.6), var(--glow-cyan-strong);
}

.profile-avatar-img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  object-position: top center;
  border-radius: calc(var(--border-radius-lg) - 4px);
  display: block;
  filter: contrast(1.03) brightness(0.98);
}

.profile-overlay-badge {
  position: absolute;
  bottom: 24px;
  left: 24px;
  right: 24px;
  background: rgba(11, 15, 25, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(0, 242, 254, 0.3);
  border-radius: var(--border-radius-md);
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.profile-overlay-badge i {
  font-size: 1.8rem;
  color: var(--cyan-primary);
}

.profile-overlay-info h5 {
  font-size: 0.95rem;
  color: var(--text-primary);
}

.profile-overlay-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   17. COMPREHENSIVE MOBILE & TABLET RESPONSIVE SYSTEM
   -------------------------------------------------------------------------- */

/* --- TABLET / SMALL LAPTOP BREAKPOINT (<= 1080px) --- */
@media (max-width: 1080px) {
  /* Navigation Drawer (Fade-Down Glassmorphic Dropdown) */
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    max-height: calc(100vh - var(--nav-height));
    overflow-y: auto;
    background: rgba(11, 15, 25, 0.97);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid rgba(0, 242, 254, 0.25);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), 0 0 30px rgba(0, 242, 254, 0.12);
    flex-direction: column;
    padding: 2.25rem 1.75rem 2.5rem;
    gap: 1.2rem;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-25px) scale(0.98);
    transition: opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1), transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.35s ease;
    z-index: 999;
  }

  .nav-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
  }

  .nav-link {
    font-size: 1.1rem;
    padding: 0.4rem 0;
    transition: color 0.25s ease, transform 0.25s ease;
  }

  .nav-link:hover {
    transform: translateY(-2px);
  }

  /* Mobile Social Icons Bar inside Mobile Dropdown Menu */
  .mobile-social-row {
    display: flex !important;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    padding-top: 1.25rem;
    margin-top: 0.5rem;
    border-top: 1px solid var(--bg-glass-border);
    width: 100%;
    max-width: 320px;
  }

  .mobile-social-btn {
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius-full);
    background: rgba(0, 242, 254, 0.08);
    border: 1px solid rgba(0, 242, 254, 0.25);
    color: var(--cyan-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    transition: all var(--transition-fast);
  }

  .mobile-social-btn:hover,
  .mobile-social-btn:active {
    background: var(--cyan-primary);
    color: var(--text-inverse);
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--glow-cyan-strong);
  }

  .mobile-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* Grid Layout Fallbacks */
  .hero-grid,
  .about-grid,
  .edu-research-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

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

  .hero-roles {
    justify-content: center;
    font-size: 1.25rem;
  }

  .hero-ctas {
    justify-content: center;
  }

  .metrics-strip {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
    width: 100%;
  }

  .hero-visual {
    max-width: 520px;
    width: 100%;
    margin: 0 auto;
  }

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

  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cert-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --- MEDIUM TABLET / PORTRAIT BREAKPOINT (<= 768px) --- */
@media (max-width: 768px) {
  .section-padding {
    padding: 4.5rem 0;
  }

  .section-header {
    margin-bottom: 2.75rem;
  }

  .section-title {
    font-size: 2rem;
  }

  /* Hero Section */
  .hero-name {
    font-size: 2.5rem;
  }

  .hero-description {
    font-size: 1.025rem;
    margin-bottom: 2rem;
  }

  .profile-avatar-img {
    height: 400px;
  }

  /* About Highlights */
  .about-highlights {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  /* Single-sided Mobile Timeline */
  .timeline::before {
    left: 18px;
  }

  .timeline-dot {
    left: 18px;
    top: 20px;
  }

  .timeline-content {
    width: calc(100% - 42px) !important;
    margin-left: 42px !important;
  }

  .timeline-card {
    padding: 1.25rem;
  }

  .timeline-role {
    font-size: 1.1rem;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .skills-grid {
    grid-template-columns: 1fr;
  }

  .cert-grid {
    grid-template-columns: 1fr;
  }

  /* Skills Filter Bar Scrollable on Mobile */
  .skills-tabs {
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 0.5rem;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
  }

  .tab-btn {
    white-space: nowrap;
    flex-shrink: 0;
  }

  .contact-form {
    padding: 1.75rem 1.25rem;
  }
}

/* --- SMALL MOBILE BREAKPOINT (<= 480px) --- */
@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }

  .section-padding {
    padding: 3.5rem 0;
  }

  .brand-logo {
    font-size: 1.1rem;
  }

  .brand-logo .logo-icon {
    width: 32px;
    height: 32px;
    font-size: 0.95rem;
  }

  .nav-actions .btn-secondary {
    display: none; /* Hide secondary download button in top bar on small mobile screens to keep layout clean */
  }

  .nav-actions .btn-sm {
    padding: 0.45rem 0.85rem;
    font-size: 0.8rem;
  }

  .hero-name {
    font-size: 2.1rem;
  }

  .hero-roles {
    font-size: 1rem;
    gap: 0.25rem 0.5rem;
  }

  .status-indicator {
    font-size: 0.775rem;
    padding: 0.35rem 0.85rem;
  }

  .hero-ctas {
    flex-direction: column;
    width: 100%;
    gap: 0.85rem;
  }

  .hero-ctas .btn {
    width: 100%;
  }

  /* Metrics 2x2 Clean Cards on Mobile */
  .metrics-strip {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.85rem;
    padding-top: 1.5rem;
  }

  .metric-item {
    background: var(--bg-card);
    border: 1px solid var(--bg-glass-border);
    border-radius: var(--border-radius-md);
    padding: 0.85rem 0.5rem;
    text-align: center;
  }

  .metric-number {
    font-size: 1.5rem;
  }

  .metric-label {
    font-size: 0.7rem;
  }

  /* Trust Cards */
  .trust-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .profile-avatar-img {
    height: 340px;
  }

  .profile-overlay-badge {
    bottom: 12px;
    left: 12px;
    right: 12px;
    padding: 0.65rem 0.85rem;
    gap: 0.65rem;
  }

  .profile-overlay-badge i {
    font-size: 1.4rem;
  }

  .profile-overlay-info h5 {
    font-size: 0.85rem;
  }

  .profile-overlay-info p {
    font-size: 0.725rem;
  }

  /* Contact Items */
  .contact-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.65rem;
  }

  .contact-item button {
    margin-left: 0 !important;
    width: 100%;
    margin-top: 0.4rem;
  }

  .site-footer {
    padding: 2rem 0;
  }

/* --------------------------------------------------------------------------
   18. GOOGLE RECAPTCHA BADGE OVERRIDE
   -------------------------------------------------------------------------- */
.grecaptcha-badge,
iframe[src*="recaptcha"],
iframe[title*="reCAPTCHA"],
div[style*="grecaptcha-badge"] {
  display: none !important;
  visibility: hidden !important;
  opacity: 0 !important;
  pointer-events: none !important;
  width: 0 !important;
  height: 0 !important;
  position: absolute !important;
  left: -9999px !important;
  top: -9999px !important;
  clip: rect(0, 0, 0, 0) !important;
}

/* --------------------------------------------------------------------------
   19. RESEARCH SECTION MOBILE RESPONSIVE ADAPTER
   -------------------------------------------------------------------------- */
.research-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
}

@media (max-width: 1024px) {
  .research-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 480px) {
  #research .glass-card {
    padding: 1.5rem 1.25rem !important;
  }
}

/* --------------------------------------------------------------------------
   20. LOADING SPINNER KEYFRAME ANIMATION
   -------------------------------------------------------------------------- */
@keyframes spinLoader {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.spin-loader,
.spin-animation,
.ri-spin {
  display: inline-block !important;
  animation: spinLoader 0.75s linear infinite !important;
}