/* ==========================================================================
   JobSphereHR Design System - Production-Grade SaaS Theme
   Aesthetic Precision: Apple / Linear / Vercel / Stripe
   ========================================================================== */

:root {
  /* Surface & Base Colors */
  --bg-dark: #08090d;
  --bg-surface-subtle: rgba(255, 255, 255, 0.02);
  --bg-card: rgba(18, 20, 29, 0.55);
  --bg-card-hover: rgba(26, 29, 42, 0.75);
  
  /* Borders & Hairlines */
  --border-color: rgba(255, 255, 255, 0.08);
  --border-subtle: rgba(255, 255, 255, 0.04);
  --border-hover: rgba(255, 255, 255, 0.18);
  --border-focus: rgba(99, 102, 241, 0.5);

  /* Brand Accents */
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-glow: rgba(99, 102, 241, 0.15);
  --accent-purple: #c084fc;
  --accent-cyan: #38bdf8;
  --accent-emerald: #34d399;

  /* Typography Colors */
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #475569;

  /* Font Families & Weights */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Inter", "Segoe UI", Roboto, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;

  /* Spacing Scale */
  --space-3xs: 0.25rem;
  --space-2xs: 0.375rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3.5rem;
  --space-3xl: 6rem;

  /* Layout Standards */
  --max-width: 1160px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Elevation & Glassmorphism */
  --backdrop-blur: blur(20px);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 24px var(--primary-glow);

  /* Easing Functions */
  --ease-out-smooth: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 150ms var(--ease-out-smooth);
  --transition-normal: 250ms var(--ease-out-smooth);
  --transition-slow: 450ms var(--ease-out-smooth);
}

/* Reset & Global Base Settings */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.5;
  letter-spacing: -0.011em;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.05) 0%, transparent 75%),
    radial-gradient(circle at 100% 100%, rgba(192, 132, 252, 0.03) 0%, transparent 50%);
}

main {
  flex: 1;
}

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

/* Accessibility Focus Ring */
:focus-visible {
  outline: 2px solid var(--primary-light);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Container Utility */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

/* Glass Card Architecture */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  box-shadow: var(--shadow-sm);
  transition: 
    transform var(--transition-normal),
    border-color var(--transition-normal),
    background-color var(--transition-normal),
    box-shadow var(--transition-normal);
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md), 0 0 0 1px var(--border-hover);
  transform: translateY(-2px);
}

/* Typographic Scale */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.025em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 700; }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.25rem); font-weight: 600; }
h3 { font-size: 1.125rem; font-weight: 600; }

p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.6;
}

/* Header & Sticky Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 9, 13, 0.7);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border-bottom: 1px solid var(--border-color);
  padding: 0.875rem 0;
  transition: border-color var(--transition-fast);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  gap: 2px;
}

.logo-accent {
  color: var(--primary-light);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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

/* Button System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(180deg, rgba(99, 102, 241, 1) 0%, rgba(79, 70, 229, 1) 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25), 0 2px 8px var(--primary-glow);
}

.btn-primary:hover {
  background: linear-gradient(180deg, rgba(129, 140, 248, 1) 0%, rgba(99, 102, 241, 1) 100%);
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35), 0 4px 16px rgba(99, 102, 241, 0.35);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

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

/* Badges & Indicators */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: 0.25rem 0.625rem;
  font-size: 0.725rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
}

.badge-featured {
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary-light);
  border: 1px solid rgba(99, 102, 241, 0.25);
}

/* Inputs & Form Fields */
.input-field {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 0.9rem;
  padding: 0.625rem 0.875rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-field:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.input-field::placeholder {
  color: var(--text-dim);
}

/* Skeleton Loading Overlay */
.skeleton {
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.02) 25%, rgba(255, 255, 255, 0.06) 50%, rgba(255, 255, 255, 0.02) 75%);
  background-size: 200% 100%;
  animation: skeletonPulse 2s infinite ease-in-out;
  border-radius: var(--radius-sm);
}

@keyframes skeletonPulse {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Footer Architecture */
.footer {
  background: rgba(8, 9, 13, 0.95);
  border-top: 1px solid var(--border-color);
  padding: var(--space-3xl) 0 var(--space-xl) 0;
  margin-top: var(--space-3xl);
}