/* Custom Styles & Modern Responsive Enhancements */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Primary Accent Palette */
  --primary: #6366f1;
  --primary-rgb: 99, 102, 241;
  --accent-cyan: #06b6d4;
  --accent-purple: #a855f7;

  /* Theme Defaults (Light Mode) */
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --border-card: #e2e8f0;
  --border-card-hover: rgba(99, 102, 241, 0.35);
  --text-title: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --header-bg: rgba(255, 255, 255, 0.88);
  --header-border: #e2e8f0;
  --inner-card-bg: #f1f5f9;
  --inner-card-border: #e2e8f0;
}

html.dark {
  /* Dark Mode Overrides */
  --bg-page: #0b0f19;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(22, 31, 48, 0.85);
  --border-card: rgba(255, 255, 255, 0.08);
  --border-card-hover: rgba(99, 102, 241, 0.4);
  --text-title: #ffffff;
  --text-body: #cbd5e1;
  --text-muted: #94a3b8;
  --header-bg: rgba(11, 15, 25, 0.85);
  --header-border: rgba(255, 255, 255, 0.08);
  --inner-card-bg: rgba(15, 23, 42, 0.7);
  --inner-card-border: rgba(255, 255, 255, 0.06);
}

body {
  font-family: var(--font-sans);
  scroll-behavior: smooth;
  background-color: var(--bg-page);
  color: var(--text-body);
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-page);
}
::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 9999px;
}
html.dark ::-webkit-scrollbar-thumb {
  background: #334155;
}
::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}
html.dark ::-webkit-scrollbar-thumb:hover {
  background: #475569;
}

/* Glassmorphism Header */
.glass-header {
  background: var(--header-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--header-border);
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

/* Glassmorphism Cards */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-card);
  box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html.dark .glass-card {
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.4);
}

.glass-card:hover {
  border-color: var(--border-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 16px 32px -8px rgba(99, 102, 241, 0.15);
}

html.dark .glass-card:hover {
  box-shadow: 0 16px 32px -8px rgba(99, 102, 241, 0.25);
}

/* Inner Nested Cards */
.inner-card {
  background: var(--inner-card-bg);
  border: 1px solid var(--inner-card-border);
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

/* Gradient Mesh Background effect */
.bg-mesh-dark {
  background-image: 
    radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 0%, rgba(6, 182, 212, 0.12) 0px, transparent 50%),
    radial-gradient(at 50% 100%, rgba(168, 85, 247, 0.12) 0px, transparent 55%);
}

.bg-mesh-light {
  background-image: 
    radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.08) 0px, transparent 50%),
    radial-gradient(at 100% 0%, rgba(6, 182, 212, 0.08) 0px, transparent 50%),
    radial-gradient(at 50% 100%, rgba(168, 85, 247, 0.08) 0px, transparent 55%);
}

/* Text Gradients */
.gradient-text-primary {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #0284c7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* Glowing Dots and Borders */
.glow-badge {
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.35);
}

.pulse-circle {
  animation: pulse-ring 2s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(34, 197, 94, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
}

/* Timeline specific styling */
.timeline-line {
  position: absolute;
  left: 20px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, #6366f1, #a855f7, #06b6d4, transparent);
}

@media (min-width: 768px) {
  .timeline-line-centered {
    left: 50%;
    transform: translateX(-50%);
  }
}

/* Code badge / monospace pills */
.font-mono-code {
  font-family: var(--font-mono);
}

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

.animate-float {
  animation: float-slow 5s ease-in-out infinite;
}

/* Modal Transitions */
.modal-overlay {
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.modal-content {
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
}

.modal-hidden {
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
}

.modal-hidden .modal-content {
  transform: scale(0.95) translateY(12px);
}

/* Toast notification */
.toast {
  transform: translateY(100px);
  opacity: 0;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Filter Buttons - Dedicated State Management */
.filter-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  border-radius: 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  outline: none;
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.filter-btn:not(.active) {
  background-color: var(--bg-card);
  color: var(--text-body);
  border: 1px solid var(--border-card);
}

.filter-btn:not(.active):hover {
  background-color: var(--inner-card-bg);
  color: var(--text-title);
  border-color: rgba(99, 102, 241, 0.3);
}

html.dark .filter-btn:not(.active) {
  background-color: rgba(30, 41, 59, 0.8);
  color: #cbd5e1;
  border-color: rgba(255, 255, 255, 0.08);
}

html.dark .filter-btn:not(.active):hover {
  background-color: rgba(51, 65, 85, 0.8);
  color: #ffffff;
  border-color: rgba(99, 102, 241, 0.4);
}

.filter-btn.active {
  background-color: #4f46e5 !important;
  color: #ffffff !important;
  border: 1px solid #4f46e5 !important;
  box-shadow: 0 4px 14px -1px rgba(79, 70, 229, 0.4);
}

.filter-btn.active:hover {
  background-color: #4338ca !important;
  color: #ffffff !important;
}

.filter-btn.active i {
  color: #ffffff !important;
}

.filter-btn:focus-visible {
  outline: 2px solid #6366f1;
  outline-offset: 2px;
}