/* ==========================================================================
   base2ace Academy - Interactive Data Structures
   Main Stylesheet & Design System
   ========================================================================== */

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

:root {
  /* Color Palette - Premium Dark Theme */
  --bg-main: #0b0f19;
  --bg-card: rgba(18, 26, 43, 0.75);
  --bg-card-hover: rgba(26, 37, 61, 0.85);
  --bg-surface: #131c2e;
  --bg-surface-border: rgba(255, 255, 255, 0.08);
  --bg-glass: rgba(15, 23, 42, 0.85);
  
  /* Brand Accent Colors */
  --primary: #3b82f6;        /* Electric Blue */
  --primary-glow: rgba(59, 130, 246, 0.4);
  --secondary: #06b6d4;      /* Cyan */
  --secondary-glow: rgba(6, 182, 212, 0.3);
  --accent-purple: #8b5cf6;  /* Purple Accent */
  
  /* Status & Visualizer State Colors */
  --accent-amber: #f59e0b;   /* Highlight / Current step pointer */
  --accent-green: #10b981;   /* Success / Found / Shift target */
  --accent-red: #ef4444;     /* Delete / Target to remove */
  --accent-sky: #38bdf8;     /* Access / Active calculation */
  
  /* Text Colors */
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  /* Fonts */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-code: 'JetBrains Mono', monospace;
  
  /* Radii & Shadows */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --shadow-glow: 0 0 25px var(--primary-glow);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Resets */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(59, 130, 246, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(6, 182, 212, 0.08) 0%, transparent 40%);
  background-attachment: fixed;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
  background: #1e293b;
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* Header & Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--bg-surface-border);
  padding: 0.85rem 2rem;
}

.nav-container {
  max-width: 1300px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
}

.brand-logo-img {
  height: 38px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.4));
  border-radius: var(--radius-sm);
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(to right, #ffffff, #93c5fd);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-sub {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--secondary);
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  flex-wrap: wrap;
  justify-content: center;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.83rem;
  font-weight: 600;
  white-space: nowrap;
  transition: var(--transition);
  padding: 0.35rem 0.55rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.08);
}

.nav-link.active {
  color: var(--secondary);
  font-weight: 700;
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.25);
}

.ds-dropdown-select {
  background: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--bg-surface-border);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  outline: none;
  transition: var(--transition);
}

.ds-dropdown-select:hover, .ds-dropdown-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
}

/* Badge Component */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-primary {
  background: rgba(59, 130, 246, 0.15);
  color: var(--primary);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.badge-success {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* Main Container Layout */
.container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Footer */
.footer {
  border-top: 1px solid var(--bg-surface-border);
  padding: 2.5rem 2rem;
  margin-top: 4rem;
  background: rgba(11, 15, 25, 0.9);
  text-align: center;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.footer-content {
  max-width: 1300px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary);
}

/* Common Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #2563eb);
  color: #fff;
  box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--primary-glow);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--bg-surface-border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-accent {
  background: linear-gradient(135deg, var(--secondary), #0891b2);
  color: #fff;
  box-shadow: 0 4px 15px var(--secondary-glow);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--secondary-glow);
}

.btn-sm {
  padding: 0.4rem 0.8rem;
  font-size: 0.82rem;
  border-radius: var(--radius-sm);
}

/* Modal Utility */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(5, 8, 15, 0.85);
  backdrop-filter: blur(10px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal-card {
  background: #111827;
  border: 1px solid var(--bg-surface-border);
  border-radius: var(--radius-lg);
  max-width: 750px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
  padding: 2rem;
  transform: scale(0.95);
  transition: var(--transition);
}

.modal-overlay.open .modal-card {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--bg-surface-border);
}

.modal-title {
  font-size: 1.35rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-main);
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
}

.modal-close:hover {
  color: var(--accent-red);
}

/* Strict Mobile Viewport Overflow Protection */
html, body {
  max-width: 100vw;
  overflow-x: hidden !important;
}

/* Mobile Responsiveness for Top Navbar */
@media (max-width: 768px) {
  .navbar {
    padding: 0.65rem 0.85rem;
  }

  .nav-container {
    flex-wrap: wrap;
    gap: 0.6rem;
  }

  .brand-name {
    font-size: 1.05rem;
  }

  .brand-sub {
    font-size: 0.62rem;
  }

  .brand-logo-img {
    height: 30px;
  }

  .nav-links {
    width: 100%;
    justify-content: flex-start;
    gap: 0.4rem;
    margin-top: 0.25rem;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
  }

  .nav-link {
    display: inline-flex;
    font-size: 0.85rem;
    padding: 0.35rem 0.6rem;
  }

  .ds-dropdown-select {
    font-size: 0.8rem;
    padding: 0.4rem 0.65rem;
    max-width: 210px;
  }

  .modal-card {
    padding: 1.25rem;
    margin: 0 0.5rem;
  }
}

/* ==========================================================================
   Site Visitor Counter & Analytics Component Styles
   ========================================================================== */

/* Glowing Live Dot Animation */
.visitor-live-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-green);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 8px var(--accent-green);
  animation: pulseGreen 1.8s infinite cubic-bezier(0.4, 0, 0.6, 1);
}

@keyframes pulseGreen {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
    box-shadow: 0 0 8px var(--accent-green);
  }
  50% {
    opacity: 0.4;
    transform: scale(0.85);
    box-shadow: 0 0 2px var(--accent-green);
  }
}

/* Nav & Workspace Header Visitor Button */
.nav-visitor-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.85rem;
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-full);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(8px);
}

.nav-visitor-btn:hover {
  background: rgba(30, 41, 59, 0.9);
  border-color: var(--primary);
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
  transform: translateY(-1px);
}

.nav-visitor-btn strong {
  font-family: var(--font-code);
  color: var(--secondary);
}

/* Hero Section Visitor Stats (Landing Page) */
.visitor-hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
  width: 100%;
}

.visitor-stat-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: rgba(19, 28, 46, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

.visitor-stat-card:hover {
  background: rgba(26, 37, 61, 0.85);
  border-color: rgba(59, 130, 246, 0.4);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 0 15px rgba(59, 130, 246, 0.15);
  transform: translateY(-3px);
}

.visitor-stat-icon-bg {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-md);
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  flex-shrink: 0;
}

.visitor-stat-details {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.visitor-stat-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.visitor-stat-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.visitor-stat-value {
  font-family: var(--font-code);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
}

.visitor-stat-sub {
  font-size: 0.72rem;
  color: var(--text-dim);
}

/* Footer Visitor Badge */
.footer-visitor-counter {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 0.5rem;
  padding: 0.4rem 0.9rem;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: var(--transition);
}

.footer-visitor-counter:hover {
  background: rgba(30, 41, 59, 0.8);
  border-color: var(--secondary);
  color: var(--text-main);
  box-shadow: 0 0 12px var(--secondary-glow);
}

.footer-visitor-counter strong {
  font-family: var(--font-code);
  color: var(--secondary);
  font-size: 0.9rem;
}

.visitor-footer-tag {
  font-size: 0.65rem;
  padding: 0.15rem 0.4rem;
  background: rgba(6, 182, 212, 0.15);
  color: var(--secondary);
  border-radius: var(--radius-sm);
  font-weight: 600;
}

/* Visitor Modal Specific Styling */
.visitor-modal-card {
  max-width: 620px;
  width: 92%;
}

.visitor-analytics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 480px) {
  .visitor-analytics-grid {
    grid-template-columns: 1fr;
  }
}

.analytics-card {
  padding: 1rem 1.15rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(15, 23, 42, 0.7);
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.analytics-card.primary {
  border-color: rgba(59, 130, 246, 0.3);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(15, 23, 42, 0.7) 100%);
}

.analytics-card.cyan {
  border-color: rgba(6, 182, 212, 0.3);
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.1) 0%, rgba(15, 23, 42, 0.7) 100%);
}

.analytics-card.purple {
  border-color: rgba(139, 92, 246, 0.3);
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(15, 23, 42, 0.7) 100%);
}

.analytics-card.green {
  border-color: rgba(16, 185, 129, 0.3);
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(15, 23, 42, 0.7) 100%);
}

.analytics-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.analytics-number {
  font-family: var(--font-code);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-main);
}

.analytics-desc {
  font-size: 0.72rem;
  color: var(--text-dim);
}

.visitor-details-table {
  background: rgba(11, 15, 25, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 1.25rem;
}

.detail-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.83rem;
  color: var(--text-muted);
  border-bottom: 1px dashed rgba(255, 255, 255, 0.05);
  padding-bottom: 0.4rem;
}

.detail-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.detail-row strong {
  color: var(--text-main);
}

.detail-row code {
  font-family: var(--font-code);
  font-size: 0.75rem;
  color: var(--secondary);
  background: rgba(6, 182, 212, 0.1);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

.modal-actions-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}