/* 
 * LinkShield SaaS - Main Design System & Global Stylesheet
 * Architecture: Vanilla CSS (Custom Properties, Grid/Flexbox, Glassmorphism, Animations)
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* Color Palette - Dark Slate & Indigo Cyberpunk SaaS */
  --bg-dark: #090D16;
  --bg-surface: #0E1322;
  --bg-card: rgba(15, 23, 42, 0.85);
  --bg-card-hover: rgba(30, 41, 59, 0.9);
  --bg-card-border: rgba(255, 255, 255, 0.1);
  --bg-input: rgba(15, 23, 42, 0.95);
  
  --primary: #6366F1;
  --primary-hover: #4F46E5;
  --primary-glow: rgba(99, 102, 241, 0.4);
  --secondary: #10B981;
  --secondary-glow: rgba(16, 185, 129, 0.4);
  --accent: #38BDF8;
  --accent-purple: #A855F7;
  
  --text-main: #FFFFFF;
  --text-muted: #94A3B8;
  --text-dim: #64748B;
  
  --border-glow: linear-gradient(135deg, rgba(99, 102, 241, 0.5), rgba(16, 185, 129, 0.3));
  --gradient-text: linear-gradient(135deg, #FFFFFF 0%, #C7D2FE 50%, #818CF8 100%);
  --gradient-accent: linear-gradient(135deg, #6366F1 0%, #4F46E5 50%, #10B981 100%);
  --gradient-glass: linear-gradient(180deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.01) 100%);
  --nav-bg-scrolled: rgba(9, 13, 22, 0.95);
  --nav-border-scrolled: rgba(255, 255, 255, 0.1);
  
  /* Status Colors */
  --success: #10B981;
  --error: #EF4444;
  --warning: #F59E0B;
  --info: #3B82F6;

  /* Shadows */
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.25);

  /* Layout Constants */
  --container-max: 1240px;
  --header-height: 80px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Body & Main Layout */
html, body {
  width: 100%;
  min-height: 100vh;
  position: relative;
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* IE and Edge */
  overflow-y: auto;
  overflow-x: hidden;
}

main {
  position: relative;
  z-index: 1;
}

html::-webkit-scrollbar,
body::-webkit-scrollbar,
*::-webkit-scrollbar {
  display: none !important;
  width: 0 !important;
  height: 0 !important;
  background: transparent !important;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4.25rem); font-weight: 800; }
h2 { font-size: clamp(2rem, 3.5vw, 3rem); font-weight: 700; }
h3 { font-size: clamp(1.35rem, 2.5vw, 1.85rem); }
h4 { font-size: 1.2rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

p {
  color: var(--text-muted);
}

a {
  color: inherit;
  text-decoration: none;
}

/* Utility Classes */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-center { text-align: center; }

.section-padding {
  padding: 6rem 0;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

/* Background Glowing Orbs (Hardware-Accelerated Ambient Lighting) */
.bg-glow-container {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 1400px;
  height: 700px;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.bg-orb-1 {
  top: -120px;
  left: 20%;
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.35) 0%, rgba(99, 102, 241, 0) 70%);
}

.bg-orb-2 {
  top: 150px;
  right: 15%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.22) 0%, rgba(16, 185, 129, 0) 70%);
}



/* Glassmorphism Panel */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transition: var(--transition-normal);
}

.glass-panel:hover {
  border-color: rgba(99, 102, 241, 0.3);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.9rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition-normal);
  text-decoration: none;
  white-space: nowrap;
  outline: none;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #FFFFFF;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(99, 102, 241, 0.5);
  color: #FFFFFF;
}

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

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--bg-card-border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  color: #FFFFFF;
}

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-md);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.25s cubic-bezier(0.4, 0, 0.2, 1),
              border-color 0.25s cubic-bezier(0.4, 0, 0.2, 1),
              backdrop-filter 0.25s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: background-color, border-color;
  transform: translateZ(0);
}

.navbar.scrolled {
  background: rgba(9, 13, 22, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-logo img {
  height: 40px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

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

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Footer */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--bg-card-border);
  padding: 5rem 0 2rem 0;
  position: relative;
  z-index: 10;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 4rem;
}

.footer-brand p {
  margin-top: 1rem;
  max-width: 320px;
  font-size: 0.95rem;
}

.footer-heading {
  color: var(--text-main);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  letter-spacing: 0.02em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: var(--text-main);
  transform: translateX(3px);
}

.footer-bottom {
  border-top: 1px solid var(--bg-card-border);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.9rem;
  color: var(--text-dim);
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  border: 1px solid var(--bg-card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: var(--transition-fast);
}

.social-icon:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #FFFFFF;
}

/* Responsive Tablet & Mobile Styles (<= 992px) */
@media (max-width: 992px) {
  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    border-radius: 0;
    background: var(--nav-bg-scrolled);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 2rem 1.5rem;
    gap: 1.5rem;
    border-bottom: 1px solid var(--bg-card-border);
    transform: translateY(-150%);
    transition: var(--transition-normal);
  }

  .nav-links.active {
    transform: translateY(0);
  }

  .mobile-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    margin-left: auto;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    cursor: pointer;
    transition: var(--transition-fast);
    z-index: 1001;
  }

  .mobile-toggle:hover,
  .mobile-toggle:active {
    background: rgba(99, 102, 241, 0.2);
    border-color: rgba(99, 102, 241, 0.4);
    color: var(--text-main);
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2.25rem 1.25rem;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}