/* ==========================================================================
   PIJUSH.IN — Independent Portfolio Design System
   Modern, High-Performance, Mobile-First, Accessible
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-deep: #030611;
  --bg-dark: #070b19;
  --bg-surface: #0e1529;
  --bg-surface-elevated: #16203c;
  --bg-surface-glass: rgba(14, 21, 41, 0.72);
  --bg-glass-card: rgba(18, 27, 52, 0.65);
  --border-subtle: rgba(148, 163, 184, 0.12);
  --border-focus: rgba(99, 102, 241, 0.4);
  --border-glow: rgba(56, 189, 248, 0.28);

  /* Accents & Brand */
  --accent-primary: #38bdf8;       /* Electric Sky */
  --accent-primary-glow: rgba(56, 189, 248, 0.25);
  --accent-secondary: #818cf8;     /* Indigo Purple */
  --accent-secondary-glow: rgba(129, 140, 248, 0.25);
  --accent-emerald: #34d399;       /* Mint Green */
  --accent-amber: #fbbf24;

  /* Typography */
  --text-main: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-highlight: #ffffff;

  /* Font Families */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

  /* Spacing */
  --container-max: 1200px;
  --header-height: 72px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 320ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-deep);
  color: var(--text-main);
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
  overflow-x: clip;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-deep);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: clip;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

img, svg {
  display: block;
  max-width: 100%;
}

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

/* ==========================================================================
   NAVIGATION BAR & MOBILE DRAWER
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  transition: background-color var(--transition-smooth), border-color var(--transition-smooth), backdrop-filter var(--transition-smooth);
}

.site-header.scrolled {
  background-color: var(--bg-surface-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--text-highlight);
}

.brand-symbol {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #050814;
  font-weight: 900;
  font-size: 1.05rem;
  box-shadow: 0 0 16px var(--accent-primary-glow);
}

.brand-text {
  background: linear-gradient(90deg, #ffffff 40%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-dot {
  color: var(--accent-primary);
  -webkit-text-fill-color: var(--accent-primary);
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.5rem 0.25rem;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-highlight);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  transition: width var(--transition-fast);
}

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

.btn-nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1.25rem;
  min-height: 44px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-primary);
  border: 1px solid rgba(56, 189, 248, 0.3);
  transition: all var(--transition-fast);
}

.btn-nav:hover {
  background: var(--accent-primary);
  color: #030611;
  box-shadow: 0 0 20px var(--accent-primary-glow);
  transform: translateY(-1px);
}

/* Mobile Hamburger Toggle */
.mobile-toggle {
  display: none;
  width: 48px;
  height: 48px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  transition: background var(--transition-fast);
  z-index: 1002;
}

.mobile-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
}

.hamburger-icon {
  width: 22px;
  height: 16px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hamburger-line {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.mobile-toggle.open .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-toggle.open .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.open .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Drawer */
.mobile-drawer-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(3, 6, 17, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1001;
  opacity: 0;
  transition: opacity var(--transition-smooth);
}

.mobile-drawer-overlay.active {
  display: block;
  opacity: 1;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: -300px;
  width: 280px;
  height: 100vh;
  background: var(--bg-surface);
  border-left: 1px solid var(--border-subtle);
  z-index: 1002;
  display: flex;
  flex-direction: column;
  padding: 5rem 1.75rem 2rem;
  transition: right var(--transition-smooth);
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.6);
}

.mobile-drawer.active {
  right: 0;
}

.mobile-drawer-nav {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.mobile-drawer-link {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 0.5rem 0;
  display: block;
  min-height: 44px;
}

.mobile-drawer-link:hover, .mobile-drawer-link.active {
  color: var(--accent-primary);
}

/* ==========================================================================
   HERO SCENE — NIGHT SKY & LAYERED MOUNTAIN SILHOUETTES
   ========================================================================== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  padding-top: calc(var(--header-height) + 2rem);
  padding-bottom: 6rem;
  background: radial-gradient(circle at 50% 20%, #151b3b 0%, #0a0e22 45%, #030611 90%);
}

/* Layer 1: Canvas Starfield (Strictly behind mountains) */
.starfield-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

/* Layer 1.5: Atmospheric Nebula Glow */
.atmospheric-glow {
  position: absolute;
  top: -10%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 500px;
  background: radial-gradient(ellipse, rgba(99, 102, 241, 0.16) 0%, rgba(56, 189, 248, 0.08) 40%, transparent 70%);
  filter: blur(60px);
  z-index: 1;
  pointer-events: none;
}

/* Layer 2: Natural Layered Mountain Silhouettes */
.mountains-stage {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 380px;
  z-index: 2;
  pointer-events: none;
  overflow: hidden;
}

.mountain-layer {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.mountain-layer svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  vertical-align: bottom;
}

/* Mountain 1: Back/Distant with soft atmospheric haze */
.mountain-back {
  opacity: 0.65;
  filter: drop-shadow(0 0 12px rgba(18, 27, 52, 0.4));
}

/* Mountain 2: Mid-ground with subtle twilight rim lighting */
.mountain-mid {
  opacity: 0.85;
}

/* Mountain 3: Foreground solid dark silhouette */
.mountain-front {
  opacity: 1;
}

/* Atmospheric Horizon Mist */
.horizon-mist {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 140px;
  background: linear-gradient(to top, var(--bg-deep) 10%, rgba(3, 6, 17, 0.8) 50%, transparent 100%);
  z-index: 3;
  pointer-events: none;
}

/* Layer 3: Foreground Hero Content */
.hero-content {
  position: relative;
  z-index: 10;
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(14, 21, 41, 0.8);
  border: 1px solid var(--border-glow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  margin-bottom: 1.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent-primary);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.15);
}

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

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.6; }
}

.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: var(--text-highlight);
  margin-bottom: 1.25rem;
}

.hero-title .text-gradient {
  background: linear-gradient(135deg, #ffffff 10%, var(--accent-primary) 70%, var(--accent-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 680px;
  margin: 0 auto 2.25rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

/* Primary and Outline Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 0.85rem 1.85rem;
  min-height: 48px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), #0284c7);
  color: #030611;
  box-shadow: 0 4px 20px var(--accent-primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(56, 189, 248, 0.4);
}

.btn-outline {
  background: rgba(14, 21, 41, 0.6);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: rgba(56, 189, 248, 0.08);
  transform: translateY(-2px);
}

/* Official Google Play Download Badge Button */
.btn-playstore {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 1.35rem;
  min-height: 48px;
  background: #000000;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.45);
}

.btn-playstore:hover {
  background: #080d1a;
  border-color: var(--accent-primary);
  color: #ffffff;
  box-shadow: 0 6px 24px rgba(56, 189, 248, 0.35);
  transform: translateY(-2px);
}

.btn-playstore:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
}

.btn-playstore-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  line-height: 1.15;
}

.btn-playstore-sub {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.btn-playstore-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.01em;
}

.play-icon {
  flex-shrink: 0;
}

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

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-highlight);
  font-family: var(--font-sans);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.2rem;
}

/* ==========================================================================
   SECTION COMMON STYLES
   ========================================================================== */
.section {
  padding: 6.5rem 0;
  position: relative;
  z-index: 10;
}

.section-alt {
  background-color: var(--bg-dark);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 4rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-primary);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-highlight);
  line-height: 1.2;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   FEATURED PROJECT: RRB SUCCESS (FLAGSHIP CARD)
   ========================================================================== */
.featured-card {
  position: relative;
  background: linear-gradient(145deg, rgba(22, 32, 60, 0.7) 0%, rgba(14, 21, 41, 0.9) 100%);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-lg);
  padding: 3rem;
  margin-bottom: 3rem;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4), 0 0 30px rgba(56, 189, 248, 0.06);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  overflow: hidden;
}

.featured-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary), var(--accent-emerald));
}

.featured-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
}

.featured-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.85rem;
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-primary);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.featured-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-highlight);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.featured-summary {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.75rem;
}

.featured-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.highlight-item {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.9rem;
  color: var(--text-main);
}

.highlight-icon {
  color: var(--accent-emerald);
  flex-shrink: 0;
  margin-top: 3px;
}

.tech-stack-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.tech-pill {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.featured-preview-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  position: relative;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5);
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 1.25rem;
}

.preview-dots {
  display: flex;
  gap: 6px;
}

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

.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.preview-status {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--accent-emerald);
}

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

.metric-card {
  background: rgba(255, 255, 255, 0.03);
  padding: 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.metric-num {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-highlight);
}

.metric-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* ==========================================================================
   SECONDARY PROJECT CARDS GRID
   ========================================================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4), 0 0 24px rgba(56, 189, 248, 0.08);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.project-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
}

.project-category {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-title {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-highlight);
  margin-bottom: 0.75rem;
}

.project-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.project-footer {
  margin-top: auto;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-primary);
}

.link-arrow:hover {
  color: var(--text-highlight);
}

/* ==========================================================================
   ENGINEERING LAB & EXPERIMENTS SECTION
   ========================================================================== */
.lab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.lab-card {
  background: rgba(14, 21, 41, 0.5);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: all var(--transition-fast);
}

.lab-card:hover {
  background: rgba(18, 27, 52, 0.8);
  border-color: var(--border-glow);
  transform: translateY(-2px);
}

.lab-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--accent-secondary);
}

.lab-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-highlight);
  margin-bottom: 0.5rem;
}

.lab-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   ABOUT SECTION
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 4rem;
  align-items: center;
}

.about-text p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.skills-wrapper {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
}

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

.skills-group:last-child {
  margin-bottom: 0;
}

.skills-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  font-size: 0.825rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact-box {
  background: linear-gradient(135deg, rgba(22, 32, 60, 0.6) 0%, rgba(14, 21, 41, 0.8) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 3.5rem;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.contact-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-highlight);
  margin-bottom: 1rem;
}

.contact-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto 2.5rem;
}

.contact-methods {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.contact-card-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1.75rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-weight: 600;
  min-height: 48px;
  transition: all var(--transition-fast);
}

.contact-card-btn:hover {
  border-color: var(--accent-primary);
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-primary);
  transform: translateY(-2px);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  background-color: #02040b;
  border-top: 1px solid var(--border-subtle);
  padding: 3.5rem 0 2rem;
  margin-top: auto;
  position: relative;
  z-index: 10;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-highlight);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-link:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

/* Back to Top */
.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  cursor: pointer;
}

.back-to-top:hover {
  color: var(--accent-primary);
}

/* ==========================================================================
   DEDICATED RRB SUCCESS PRODUCT PAGE SPECIFIC STYLES
   ========================================================================== */
.product-page-hero {
  padding-top: calc(var(--header-height) + 3rem);
  padding-bottom: 5rem;
  background: radial-gradient(circle at 50% 10%, #1e1b4b 0%, #0a0e22 50%, var(--bg-deep) 100%);
  position: relative;
  overflow: hidden;
}

.product-breadcrumbs {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.product-breadcrumbs a:hover {
  color: var(--accent-primary);
}

.product-hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3.5rem;
  align-items: center;
}

.product-hero-title {
  font-size: clamp(2.5rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--text-highlight);
  margin-bottom: 1.25rem;
}

.product-hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 2rem;
}

.exam-pill-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 2.25rem;
}

.exam-pill {
  padding: 0.4rem 1rem;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-primary);
}

.feature-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.feature-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.feature-box:hover {
  transform: translateY(-3px);
  border-color: var(--border-glow);
}

.feature-box-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.feature-box-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-highlight);
  margin-bottom: 0.75rem;
}

.feature-box-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.architecture-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}

.arch-layer {
  display: grid;
  grid-template-columns: 180px 1fr;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border-subtle);
  align-items: center;
}

.arch-layer:last-child {
  border-bottom: none;
}

.arch-layer-name {
  font-weight: 700;
  color: var(--accent-primary);
  font-size: 0.95rem;
}

.arch-layer-details {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ==========================================================================
   RESPONSIVE DESIGN & MOBILE OVERRIDES
   ========================================================================== */
@media (max-width: 992px) {
  .featured-grid,
  .about-grid,
  .product-hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .mountains-stage {
    height: 300px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .desktop-nav {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero-section {
    padding-top: calc(var(--header-height) + 1.5rem);
    padding-bottom: 4.5rem;
    min-height: 92vh;
  }

  .mountains-stage {
    height: 240px;
  }

  .hero-stats {
    gap: 1.5rem;
  }

  .stat-value {
    font-size: 1.4rem;
  }

  .featured-card {
    padding: 1.75rem;
  }

  .featured-highlights {
    grid-template-columns: 1fr;
  }

  .projects-grid,
  .feature-cards-grid {
    grid-template-columns: 1fr;
  }

  .contact-box {
    padding: 2rem 1.25rem;
  }

  .footer-content,
  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 1.25rem;
  }

  .footer-links {
    justify-content: center;
  }

  .arch-layer {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn,
  .hero-actions .btn-playstore,
  .featured-actions .btn,
  .featured-actions .btn-playstore {
    width: 100%;
  }

  .mountains-stage {
    height: 200px;
  }
}

/* ==========================================================================
   ACCESSIBILITY: PREFERS-REDUCED-MOTION
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .status-dot {
    animation: none;
  }

  .starfield-canvas {
    opacity: 0.7;
  }
}