/* ============================================
   ASTRA DESIGN SYSTEM — main.css
   Core tokens, reset, typography, layout
   ============================================ */

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

/* ---- Design Tokens ---- */
:root {
  /* Colors */
  --color-bg:          #070a13;
  --color-bg-alt:      #0c1221;
  --color-surface:     rgba(15, 23, 42, 0.6);
  --color-surface-solid: #0f172a;
  --color-primary:     #3b82f6;
  --color-primary-rgb: 59, 130, 246;
  --color-primary-light: #60a5fa;
  --color-primary-dark: #2563eb;
  --color-accent:      #8b5cf6;
  --color-accent-rgb:  139, 92, 246;
  --color-accent-light: #a78bfa;
  --color-glow:        rgba(59, 130, 246, 0.25);
  --color-glow-strong: rgba(59, 130, 246, 0.4);
  --color-text:        #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-muted:  #94a3b8;
  --color-success:     #10b981;
  --color-warning:     #f59e0b;
  --color-danger:      #ef4444;
  --color-border:      rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(59, 130, 246, 0.3);
  --glass-bg:          rgba(15, 23, 42, 0.65);
  --glass-border:      rgba(255, 255, 255, 0.12);
  --glass-highlight:   rgba(255, 255, 255, 0.05);

  /* Gradients */
  --grad-primary: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  --grad-surface: linear-gradient(180deg, rgba(255, 255, 255, 0.05) 0%, transparent 100%);

  /* Typography */
  --font-heading: 'Outfit', sans-serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Radii */
  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  16px;
  --radius-xl:  24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-glow: 0 0 20px rgba(52, 152, 219, 0.15), 0 0 60px rgba(52, 152, 219, 0.05);
  --shadow-glow-strong: 0 0 30px rgba(52, 152, 219, 0.25), 0 0 80px rgba(52, 152, 219, 0.1);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Layout */
  --nav-height: 72px;
  --container-max: 1200px;
  --container-narrow: 800px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, video, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
  color: inherit;
}

code, pre {
  font-family: var(--font-mono);
}

/* ---- Typography ---- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  color: var(--color-text);
  letter-spacing: -0.03em;
}

h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
h2 { font-size: clamp(2rem, 5vw, 2.75rem); }
h3 { font-size: clamp(1.35rem, 3.5vw, 1.75rem); }
h4 { font-size: 1.25rem; }

p {
  color: var(--color-text-secondary);
  max-width: 65ch;
  font-weight: 400;
}

.text-gradient {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 50%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-center { text-align: center; }
.text-muted  { color: var(--color-text-muted); }

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

.container--narrow {
  max-width: var(--container-narrow);
}

.section {
  padding: var(--space-4xl) 0;
}

.section--hero {
  padding-top: calc(var(--nav-height) + var(--space-4xl));
  padding-bottom: var(--space-4xl);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

/* ---- Grid ---- */
.grid {
  display: grid;
  gap: var(--space-xl);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

/* ---- Animations ---- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes glow-pulse {
  0%, 100% { box-shadow: var(--shadow-glow); }
  50%      { box-shadow: var(--shadow-glow-strong); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-15px); }
}

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

/* Scroll-triggered animation class */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered children */
.stagger > .animate-on-scroll:nth-child(1) { transition-delay: 0ms; }
.stagger > .animate-on-scroll:nth-child(2) { transition-delay: 100ms; }
.stagger > .animate-on-scroll:nth-child(3) { transition-delay: 200ms; }
.stagger > .animate-on-scroll:nth-child(4) { transition-delay: 300ms; }
.stagger > .animate-on-scroll:nth-child(5) { transition-delay: 400ms; }
.stagger > .animate-on-scroll:nth-child(6) { transition-delay: 500ms; }

/* Reduced motion */
  .animate-on-scroll {
    opacity: 1;
    transform: none;
  }
}

/* ---- Utilities ---- */
.mb-xs { margin-bottom: var(--space-xs); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }

.flex { display: flex; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-md { gap: var(--space-md); }

.w-full { width: 100%; }
.relative { position: relative; }

.glow-text {
  text-shadow: 0 0 20px rgba(var(--color-primary-rgb), 0.3);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ---- Background Effects ---- */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.04) 1px, transparent 1px);
  background-size: 80px 80px;
  pointer-events: none;
}

.bg-radial {
  position: fixed;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 150%;
  height: 100%;
  background: radial-gradient(circle at center, rgba(59, 130, 246, 0.08) 0%, rgba(139, 92, 246, 0.05) 30%, transparent 60%);
  pointer-events: none;
  z-index: -1;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  :root {
    --space-4xl: 3rem;
  }

  .container {
    padding: 0 var(--space-md);
  }

  .grid--3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }
}