/* ==========================================================================
   KIIT IEEE - Design System & Custom Styles
   "Where Students Build What's Next."
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Brand Palette */
  --brand-primary: #6366f1;       /* Indigo */
  --brand-primary-light: #818cf8;
  --brand-primary-dark: #4f46e5;
  --brand-cyan: #06b6d4;          /* Cyber Cyan */
  --brand-violet: #8b5cf6;        /* Electric Violet */
  --brand-emerald: #10b981;       /* Emerald Success */
  --brand-amber: #f59e0b;         /* Warning / Spotlight */
  --brand-rose: #f43f5e;          /* Urgent / Live */

  /* Dark Canvas Colors */
  --bg-darkest: #07090e;
  --bg-darker: #0c1017;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(24, 32, 50, 0.9);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.35);
  --border-cyan-glow: rgba(6, 182, 212, 0.35);

  /* Gradients */
  --grad-hero: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #06b6d4 100%);
  --grad-surface: linear-gradient(180deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.01) 100%);
  --grad-glow: radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-darkest);
  color: #f1f5f9;
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: #090d14;
}
::-webkit-scrollbar-thumb {
  background: #1e293b;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #334155;
}

/* Glassmorphism Classes */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: 1rem;
}

.glass-nav {
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

.glass-card {
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.07);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.glass-card:hover {
  background: rgba(22, 33, 58, 0.8);
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-3px);
  box-shadow: 0 12px 30px -10px rgba(99, 102, 241, 0.2);
}

.glow-indigo {
  box-shadow: 0 0 25px -5px rgba(99, 102, 241, 0.4);
}

.glow-cyan {
  box-shadow: 0 0 25px -5px rgba(6, 182, 212, 0.4);
}

.glow-emerald {
  box-shadow: 0 0 25px -5px rgba(16, 185, 129, 0.4);
}

/* Text Gradients */
.text-gradient-hero {
  background: linear-gradient(135deg, #ffffff 20%, #818cf8 60%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.text-gradient-amber {
  background: linear-gradient(135deg, #fbbf24 0%, #f97316 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Pulsing Dots */
.live-pulse {
  position: relative;
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10b981;
}

.live-pulse::after {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: #10b981;
  opacity: 0.75;
  animation: pulse-ring 1.8s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 0.8; }
  50% { transform: scale(2.2); opacity: 0; }
  100% { transform: scale(2.2); opacity: 0; }
}

/* Floating animation */
@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-8px) rotate(0.5deg); }
}

.animate-float {
  animation: float 6s ease-in-out infinite;
}

.animate-float-delayed {
  animation: float 7s ease-in-out 2s infinite;
}

/* Shimmer animation for skeletons & hero */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.shimmer {
  background: linear-gradient(90deg, rgba(255,255,255,0.03) 25%, rgba(255,255,255,0.09) 50%, rgba(255,255,255,0.03) 75%);
  background-size: 200% 100%;
  animation: shimmer 2s infinite;
}

/* Code block typography */
pre, code {
  font-family: var(--font-mono);
}

/* Custom interactive physics canvas in Hero */
#hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

/* Badge tags */
.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 9999px;
  letter-spacing: 0.025em;
  transition: all 0.2s;
}

.badge-ai {
  background: rgba(139, 92, 246, 0.15);
  color: #c084fc;
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.badge-robotics {
  background: rgba(6, 182, 212, 0.15);
  color: #38bdf8;
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.badge-web3 {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-hackathon {
  background: rgba(244, 63, 94, 0.15);
  color: #fb7185;
  border: 1px solid rgba(244, 63, 94, 0.3);
}

/* Modal Backdrop */
.modal-backdrop {
  background: rgba(4, 7, 13, 0.78);
  backdrop-filter: blur(8px);
}

/* Button Spring Press */
.btn-press {
  transition: transform 0.15s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.15s;
}
.btn-press:active {
  transform: scale(0.96);
}

/* Hide scrollbar for clean tab rails */
.no-scrollbar::-webkit-scrollbar {
  display: none;
}
.no-scrollbar {
  -ms-overflow-style: none;
  scrollbar-width: none;
}