/* Custom CSS Styles for Nguyen Duy Hung Portfolio */
@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500;600&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

:root {
  --bg-dark: #090d16;
  --bg-card: rgba(18, 24, 38, 0.75);
  --accent-cyan: #06b6d4;
  --accent-violet: #8b5cf6;
  --accent-emerald: #10b981;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
}

body {
  font-family: 'Plus Jakarta Sans', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  overflow-x: hidden;
  scroll-behavior: smooth;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: #0b0f19;
}
::-webkit-scrollbar-thumb {
  background: #1f293d;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #06b6d4;
}

/* Code font */
.font-mono-code {
  font-family: 'Fira Code', monospace;
}

/* Glassmorphism background */
.glass-panel {
  background: rgba(15, 22, 36, 0.65);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.glass-nav {
  background: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.glass-card {
  background: linear-gradient(135deg, rgba(20, 29, 47, 0.7) 0%, rgba(13, 19, 32, 0.8) 100%);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.07);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-card:hover {
  border-color: rgba(6, 182, 212, 0.4);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px -10px rgba(6, 182, 212, 0.15);
}

/* Neon Text Gradient */
.text-gradient-primary {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-cyan {
  background: linear-gradient(135deg, #22d3ee 0%, #3b82f6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-emerald {
  background: linear-gradient(135deg, #34d399 0%, #059669 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Glowing Elements */
.glow-cyan {
  box-shadow: 0 0 25px rgba(6, 182, 212, 0.3);
}

.glow-violet {
  box-shadow: 0 0 25px rgba(139, 92, 246, 0.3);
}

/* Dynamic background blob animations */
@keyframes blob-bounce {
  0%, 100% {
    transform: translate(0px, 0px) scale(1);
  }
  33% {
    transform: translate(30px, -50px) scale(1.1);
  }
  66% {
    transform: translate(-20px, 20px) scale(0.95);
  }
}

.animate-blob {
  animation: blob-bounce 12s infinite ease-in-out;
}

.animation-delay-2000 {
  animation-delay: 2s;
}

.animation-delay-4000 {
  animation-delay: 4s;
}

/* Grid overlay background */
.bg-grid-pattern {
  background-size: 40px 40px;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
}

/* Pulse status dot */
.pulse-dot {
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  0% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(16, 185, 129, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

/* Active navigation link indicator */
.nav-link.active {
  color: #38bdf8;
  font-weight: 600;
}
.nav-link.active::after {
  content: '';
  display: block;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, #38bdf8, #818cf8);
  border-radius: 2px;
  margin-top: 2px;
}

/* Filter tab active button */
.filter-btn.active {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.25) 0%, rgba(99, 102, 241, 0.25) 100%);
  border-color: #06b6d4;
  color: #ffffff;
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.2);
}

/* Terminal typing effect cursor */
.typing-cursor::after {
  content: '|';
  animation: blink 1s step-start infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

/* Responsive Bottom Sheet & Modal Animations */
.modal-overlay {
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}
.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* Mobile: Bottom Sheet slide-up animation */
.modal-container {
  transform: translateY(100%);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-container {
  transform: translateY(0);
}

/* Desktop (sm: min-width 640px): Centered scale-up dialog */
@media (min-width: 640px) {
  .modal-container {
    transform: scale(0.95) translateY(20px);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  }
  .modal-overlay.active .modal-container {
    transform: scale(1) translateY(0);
  }
}

/* Scroll Reveal Entrance Animation */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(35px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.reveal-on-scroll.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger Delay Utility Classes */
.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }
.delay-500 { transition-delay: 500ms; }

/* Interactive Mouse Spotlight on Glass Cards */
.glass-card {
  position: relative;
}

.glass-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1.5px;
  background: radial-gradient(
    500px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
    rgba(6, 182, 212, 0.45),
    transparent 40%
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

/* Language Switcher Styling */
.lang-switch-btn {
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
}
.lang-switch-btn.active {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.3) 0%, rgba(59, 130, 246, 0.3) 100%);
  color: #22d3ee;
  border-color: rgba(6, 182, 212, 0.5);
  box-shadow: 0 0 12px rgba(6, 182, 212, 0.25);
}

/* Mobile Drawer Backdrop */
#mobile-drawer-backdrop {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
#mobile-drawer-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

/* Back to Top floating button */
#back-to-top-btn {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Touch optimization for mobile */
@media (max-width: 640px) {
  .tap-highlight-transparent {
    -webkit-tap-highlight-color: transparent;
  }
}