/**
 * NEXA - Global Design System & Master Stylesheet
 * Enterprise-grade dark slate theme with refined glassmorphism, fluid micro-interactions,
 * and high-contrast accessible typography.
 */

/* ==========================================================================
   DESIGN TOKENS & MASTER CSS VARIABLES
   ========================================================================== */

:root {
  /* PRIMARY ACCENTS - Indigo & Electric Violet */
  --color-primary: #2b8fff;
  --color-primary-light: #5aa6f5;
  --color-primary-dark: #1a6fe0;
  --color-secondary: #8b5cf6;
  --color-tertiary: #3b82f6;
  --color-accent: #ec4899;
  --color-emerald: #10b981;
  
  /* SURFACE LAYERS - Dark Obsidian Slate */
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-tertiary: #1e293b;
  --bg-elevated: #334155;
  --bg-surface-hover: rgba(255, 255, 255, 0.04);
  
  /* TEXT COLOR HIERARCHY */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --text-disabled: #475569;
  
  /* SEMANTIC STATUS COLORS */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;
  
  /* GLASS MORPHISM & BORDER SYSTEM */
  --glass-bg: rgba(15, 23, 42, 0.75);
  --glass-bg-heavy: rgba(9, 13, 22, 0.92);
  --glass-bg-hover: rgba(30, 41, 59, 0.85);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-border-strong: rgba(255, 255, 255, 0.16);
  --glass-border-accent: rgba(43, 143, 255, 0.35);
  
  /* ELEVATED SHADOWS & AMBIENT GLOWS */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45);
  --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.6);
  
  --glow-sm: 0 0 0 0 transparent;
  --glow-md: 0 0 0 0 transparent;
  --glow-lg: 0 0 0 0 transparent;
  --glow-purple: 0 0 0 0 transparent;
  --glow-pink: 0 0 0 0 transparent;
  
  /* SPACING SCALE */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* BORDER RADIUS */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* TYPOGRAPHY SCALE */
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  
  /* TRANSITION SPRINGS */
  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-base: 250ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-spring: 350ms cubic-bezier(0.34, 1.4, 0.64, 1);
  
  /* Z-INDEX LAYERS */
  --z-dropdown: 1000;
  --z-sticky: 1100;
  --z-modal: 1200;
  --z-popover: 1300;
  --z-tooltip: 1400;
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  color-scheme: dark;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: var(--text-base);
  overflow-x: hidden;
}

::selection {
  background-color: rgba(43, 143, 255, 0.3);
  color: #ffffff;
}

/* SLEEK SCROLLBAR */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-elevated);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-light);
}

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

h1 { font-size: var(--text-4xl); line-height: 1.2; }
h2 { font-size: var(--text-3xl); line-height: 1.3; }
h3 { font-size: var(--text-2xl); line-height: 1.4; }
h4 { font-size: var(--text-xl); line-height: 1.5; }

p {
  color: var(--text-secondary);
  line-height: 1.65;
}

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #ffffff;
}

/* ==========================================================================
   ENTERPRISE BUTTONS
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-sm);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-transform: none;
  letter-spacing: -0.01em;
  position: relative;
  overflow: hidden;
  user-select: none;
  outline: none;
}

.btn:focus-visible {
  box-shadow: var(--shadow-sm);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  box-shadow: var(--shadow-md), var(--glow-sm);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--glass-border-strong);
}

.btn-secondary:hover {
  background: var(--bg-elevated);
  border-color: var(--color-primary-light);
  transform: translateY(-1px);
}

.btn-secondary:active {
  transform: translateY(0);
}

.btn-danger {
  background: var(--color-error);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.btn-danger:hover {
  background: #dc2626;
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
}

.btn-ghost:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
  border-color: var(--glass-border);
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* ==========================================================================
   FORM CONTROLS
   ========================================================================== */

input[type="text"],
input[type="email"],
input[type="password"],
input[type="tel"],
input[type="number"],
textarea,
select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
  backdrop-filter: blur(12px);
  outline: none;
}

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

input:hover,
textarea:hover,
select:hover {
  border-color: var(--glass-border-strong);
}

input:focus,
textarea:focus,
select:focus {
  background: var(--bg-tertiary);
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-sm);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

label {
  display: block;
  margin-bottom: var(--spacing-xs);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-error {
  color: var(--color-error);
  font-size: var(--text-xs);
  margin-top: var(--spacing-xs);
}

/* ==========================================================================
   CARDS & CONTAINERS
   ========================================================================== */

.card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.card:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-strong);
  box-shadow: var(--shadow-md);
}

.card-interactive {
  cursor: pointer;
}

.card-interactive:hover {
  transform: translateY(-2px);
}

.card-interactive:active {
  transform: translateY(0);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.grid { display: grid; gap: var(--spacing-lg); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

/* ==========================================================================
   ANIMATIONS & UTILITIES
   ========================================================================== */

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideInUp {
  from { transform: translateY(16px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes slideInDown {
  from { transform: translateY(-16px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.animate-in { animation: slideInUp var(--transition-base) ease-out; }
.animate-fade-in { animation: fadeIn var(--transition-base) ease-out; }
.animate-pulse { animation: pulse 2s infinite; }

.text-center { text-align: center; }
.text-right { text-align: right; }
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.hidden { display: none !important; }
.visible { display: block !important; }
.pointer-events-none { pointer-events: none; }
.cursor-pointer { cursor: pointer; }
.select-none { user-select: none; }

/* ==========================================================================
   STATUS BADGES & TOASTS
   ========================================================================== */

.status-badge {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--bg-primary);
}

.status-online {
  background: var(--color-success);
  box-shadow: var(--shadow-sm);
}

.status-away { background: var(--color-warning); }
.status-offline { background: var(--text-tertiary); }

.toast {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  background: var(--glass-bg-heavy);
  border: 1px solid var(--glass-border-strong);
  border-left: 4px solid var(--color-primary);
  color: var(--text-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-lg);
  animation: slideInUp var(--transition-base) ease-out;
  z-index: var(--z-popover);
}

.toast-success { border-left-color: var(--color-success); }
.toast-error { border-left-color: var(--color-error); }
.toast-warning { border-left-color: var(--color-warning); }

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

@media (max-width: 1024px) {
  .grid-cols-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root {
    --text-4xl: 2rem;
    --text-3xl: 1.5rem;
  }
  .grid-cols-2, .grid-cols-3 { grid-template-columns: 1fr; }
  .container { padding: 0 var(--spacing-md); }
}