@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@500;600;700;800&display=swap');

:root {
  --color-primary: #0F172A;
  --color-primary-light: #1E293B;
  --color-accent: #10B981;
  --color-accent-hover: #059669;
  --color-accent-glow: rgba(16, 185, 129, 0.2);
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-border: #E2E8F0;
  --color-text-main: #0F172A;
  --color-text-muted: #64748B;
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  color: var(--color-text-main);
  background-color: var(--color-bg);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: #F1F5F9;
}
::-webkit-scrollbar-thumb {
  background: #CBD5E1;
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
  background: #94A3B8;
}

/* Typography Overrides */
h1, h2, h3, h4, h5, h6, .font-heading {
  font-family: var(--font-heading);
  letter-spacing: -0.02em;
}

/* Subtle Grid Background Pattern */
.bg-grid-pattern {
  background-size: 32px 32px;
  background-image: 
    linear-gradient(to right, rgba(15, 23, 42, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 23, 42, 0.04) 1px, transparent 1px);
}

.bg-grid-pattern-dark {
  background-size: 32px 32px;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
}

/* Glassmorphism Classes */
.glass-panel {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(226, 232, 240, 0.8);
}

.glass-panel-dark {
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Card Glow Effect */
.card-glow-hover {
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}
.card-glow-hover:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 30px -10px rgba(15, 23, 42, 0.08), 0 0 25px -5px rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.4);
}

/* TNM 4U Pill and Domain Chips */
.domain-badge-tnm4u {
  display: inline-flex;
  align-items: center;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: 9999px;
  background: rgba(16, 185, 129, 0.12);
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.35);
  letter-spacing: -0.01em;
}

.domain-badge-dark {
  background: rgba(16, 185, 129, 0.15);
  color: #34D399;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

/* 4U Framework Card */
.four-u-card {
  position: relative;
  transition: all 0.3s ease;
  overflow: hidden;
}
.four-u-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #10B981, #047857);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.four-u-card:hover::before {
  opacity: 1;
}
.four-u-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 28px -8px rgba(15, 23, 42, 0.08);
}

/* Animated Gradient Accent Line */
.gradient-accent-bar {
  height: 4px;
  background: linear-gradient(90deg, #10B981, #065F46, #10B981);
  background-size: 200% auto;
  animation: shimmer 4s linear infinite;
}

@keyframes shimmer {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* Badge Pulse */
.pulse-badge {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10B981;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  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);
  }
}

/* Code & Terminal styling */
.terminal-window {
  background: #0B1120;
  border: 1px solid #1E293B;
  box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.4);
  border-radius: 12px;
  overflow: hidden;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* Modal Animations */
.modal-enter {
  opacity: 0;
  transform: scale(0.95);
}
.modal-enter-active {
  opacity: 1;
  transform: scale(1);
  transition: opacity 0.2s ease-out, transform 0.2s ease-out;
}
.modal-exit {
  opacity: 1;
  transform: scale(1);
}
.modal-exit-active {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.15s ease-in, transform 0.15s ease-in;
}

/* Floating animation */
@keyframes subtle-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
.animate-float {
  animation: subtle-float 5s ease-in-out infinite;
}

/* Range input custom styling */
input[type=range] {
  accent-color: #10B981;
}

/* Active navigation link highlight */
.nav-link {
  position: relative;
  transition: color 0.2s ease;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: #10B981;
  transition: width 0.2s ease;
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}