:root {
  /* xAI / Claude Hybrid Palette (Strict Light Theme) */
  --bg: #faf9f6;               /* Claude-inspired soft, natural cream page background */
  --bg-elev: #ffffff;          /* Pure white for structural surface containers */
  --bg-input: #f4f3ef;         /* Recessed contrast color for inputs and code zones */
  
  --text: #191816;             /* Ultra-dark ink gray for crisp body copy */
  --text-secondary: #5d5a55;   /* Mid-tone slate gray for explanations */
  --text-tertiary: #8c8881;    /* Distanced gray for meta-tags/labels */
  
  --accent: #191816;           /* xAI-inspired stark solid black primary control */
  --accent-hover: #e0533c;     /* Claude-like warm vermillion interactive state */
  --accent-soft: #f2efe9;      /* Subtle tint for structure and secondary buttons */
  
  --border: #e6e4de;           /* Hairline structural dividers */
  --border-strong: #191816;    /* High-contrast definitive structural edges */
  
  --danger: #d9381e;           /* Editorial pure crimson */
  --danger-soft: #fdf2f0;
  --success: #1b8549;          /* Technical deep forest green */
  --success-soft: #edf7f1;
  
  /* Geometric Sharpness Rules */
  --radius-lg: 8px;            /* Flattened, professional structural containers */
  --radius-md: 6px;            /* Standard component elements */
  --radius-sm: 4px;            /* Snappy, sharp button/input edges */
  
  /* Typography Systems */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  
  color-scheme: light;
}

/* ==========================================================================
   Global Resets (Strict Shadow Bans)
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  box-shadow: none !important; /* Total compliance against shadow injection */
  text-shadow: none !important;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  line-height: 1.6;
  letter-spacing: -0.011em;
}

.tok-keyword{ color:#c2185b; font-weight:600; }
.tok-string{  color:#1b8549; }
.tok-comment{ color:var(--text-tertiary); font-style:italic; }
.tok-func{    color:#1a6fb0; }
.tok-num{     color:#b5651d; }


/* ==========================================================================
   Claude & xAI Hybrid Editorial Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  color: var(--text);
  font-weight: 600;
  letter-spacing: -0.02em;
}

h1 { font-size: 2.25rem; line-height: 1.2; margin-bottom: 1.5rem; }
h2 { font-size: 1.625rem; line-height: 1.3; margin-bottom: 1rem; }
h3 { font-size: 1.25rem; line-height: 1.4; }

p { 
  color: var(--text-secondary); 
  font-size: 1rem; 
  margin-bottom: 1.25rem;
}

/* Technical micro-copy (xAI Influence) */
small, .vk-meta { 
  font-family: var(--font-mono);
  color: var(--text-tertiary); 
  font-size: 0.775rem; 
  letter-spacing: 0.02em;
}

/* ==========================================================================
   Structural Layout Containers
   ========================================================================== */
.vk-app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.vk-navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.vk-container {
  width: 100%;
  max-width: 1000px; /* Slimmer max-width for an editorial reading experience */
  margin: 0 auto;
  padding: 3rem 2rem;
}

/* ==========================================================================
   Cards & Content Blocks (Flat Wireframe Aesthetic)
   ========================================================================== */
.vk-card {
  background-color: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: border-color 0.15s ease;
}

.vk-card:hover {
  border-color: var(--border-strong); /* Switches to high-contrast ink line on hover */
}

/* ==========================================================================
   Interactive UI Elements: Buttons
   ========================================================================== */
.vk-btn {
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.15s ease;
  text-decoration: none;
}

/* xAI Heavy Dark Key Variant */
.vk-btn-primary {
  background-color: var(--accent);
  color: var(--bg-elev);
  border-color: var(--accent);
}
.vk-btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
}

/* Claude Clean Secondary Variant */
.vk-btn-secondary {
  background-color: var(--bg-elev);
  color: var(--text);
  border-color: var(--border);
}
.vk-btn-secondary:hover {
  background-color: var(--bg-input);
  border-color: var(--border-strong);
}

/* Technical Minimal Ghost Variant */
.vk-btn-ghost {
  background-color: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}
.vk-btn-ghost:hover {
  color: var(--text);
  background-color: var(--accent-soft);
}

.vk-btn-danger {
  background-color: var(--danger-soft);
  color: var(--danger);
  border-color: var(--danger);
}
.vk-btn-danger:hover {
  background-color: var(--danger);
  color: #ffffff;
}

.vk-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
  background-color: var(--bg-input) !important;
  border-color: var(--border) !important;
  color: var(--text-tertiary) !important;
}

/* ==========================================================================
   Form Controls (Recessed Minimal Panels)
   ========================================================================== */
.vk-form-group {
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.vk-label {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.vk-input, .vk-textarea, .vk-select {
  font-family: inherit;
  font-size: 0.9375rem;
  color: var(--text);
  background-color: var(--bg-input); /* Recessed background input style */
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  outline: none;
  transition: all 0.15s ease;
  width: 100%;
}

.vk-input:focus, .vk-textarea:focus, .vk-select:focus {
  border-color: var(--border-strong);
  background-color: var(--bg-elev); /* Pops out to clean white on focus */
}

.vk-input::placeholder, .vk-textarea::placeholder {
  color: var(--text-tertiary);
}

/* ==========================================================================
   Technical Status Components
   ========================================================================== */
.vk-badge {
  display: inline-flex;
  padding: 0.25rem 0.625rem;
  font-family: var(--font-mono);
  font-size: 0.725rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  letter-spacing: 0.01em;
}

.vk-badge-success { 
  background-color: var(--success-soft); 
  color: var(--success); 
  border-color: rgba(27, 133, 73, 0.2);
}

.vk-badge-danger { 
  background-color: var(--danger-soft); 
  color: var(--danger); 
  border-color: rgba(217, 56, 30, 0.2);
}