/* ===========================================
   ValU AI — Base Styles (Neon Cyber)
   CSS Custom Properties + Reset + Typography + Grid
   =========================================== */

/* === FONT IMPORT (Fontshare) === */
@import url('https://api.fontshare.com/v2/css?f[]=clash-display@200,300,400,500,600,700&f[]=satoshi@300,400,500,700&display=swap');

/* ===========================================
   CSS CUSTOM PROPERTIES
   =========================================== */
:root {
  /* Neon Cyber Color Palette */
  --bg-primary:    #0a0f1c;
  --bg-secondary:  #111827;
  --bg-card:       #0d1525;
  --bg-elevated:   #141e33;
  --border-color:  rgba(0, 255, 204, 0.15);

  --text-primary:  #ffffff;
  --text-secondary:#9ca3af;
  --text-muted:    #64748b;

  --accent-cyan:   #00ffcc;
  --accent-magenta:#ff00aa;
  --accent-glow-c: rgba(0, 255, 204, 0.3);
  --accent-glow-m: rgba(255, 0, 170, 0.3);
  --accent-glow-c-strong: rgba(0, 255, 204, 0.5);
  --accent-glow-m-strong: rgba(255, 0, 170, 0.5);

  /* Gradients */
  --gradient-hero: linear-gradient(135deg, rgba(0,255,204,0.08) 0%, rgba(255,0,170,0.06) 100%);
  --gradient-card: linear-gradient(180deg, rgba(0,255,204,0.04) 0%, rgba(0,0,0,0) 100%);
  --gradient-cta:   linear-gradient(135deg, #00ffcc 0%, #00cc99 100%);

  /* Typography — clamp() for responsive scaling */
  --font-display:  'Clash Display', sans-serif;
  --font-body:     'Satoshi', sans-serif;

  --text-hero:     clamp(2rem, 6vw, 5rem);
  --text-h1:       clamp(1.75rem, 5vw, 4rem);
  --text-h2:       clamp(1.5rem, 3.5vw, 2.5rem);
  --text-h3:       clamp(1.15rem, 2.5vw, 1.75rem);
  --text-body:     clamp(0.85rem, 1.2vw, 1.1rem);
  --text-small:    clamp(0.7rem, 0.9vw, 0.9rem);
  --text-caption:  clamp(0.65rem, 0.8vw, 0.8rem);

  /* Spacing */
  --section-padding: clamp(3rem, 8vw, 8rem);
  --container-max:   1200px;
  --container-padding: clamp(1rem, 4vw, 3rem);
  --content-gap:     clamp(1rem, 2.5vw, 2.5rem);
  --element-gap:     clamp(0.5rem, 1.2vw, 1.25rem);
  --card-padding:    clamp(1.25rem, 2.5vw, 2.5rem);

  /* Borders & Radius */
  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  28px;

  /* Shadows & Glow */
  --shadow-card:  0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow-c:  0 0 20px var(--accent-glow-c), 0 0 60px var(--accent-glow-c);
  --shadow-glow-m:  0 0 20px var(--accent-glow-m), 0 0 60px var(--accent-glow-m);

  /* Transitions */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast:  0.2s;
  --duration-normal:0.4s;
  --duration-slow:  0.7s;

  /* Navbar */
  --navbar-height: clamp(3.5rem, 6vw, 4.5rem);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--text-body);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Canvas background layer */
#particles-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* Main content sits above canvas */
main, section, nav, footer {
  position: relative;
  z-index: 1;
}

/* ===========================================
   TYPOGRAPHY
   =========================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 { font-size: var(--text-h1); }
h2 { font-size: var(--text-h2); }
h3 { font-size: var(--text-h3); }

p {
  color: var(--text-secondary);
  line-height: 1.7;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--duration-fast) ease;
}

a:hover {
  color: #00ffaa;
  text-shadow: 0 0 12px var(--accent-glow-c);
}

/* Neon text utility */
.text-neon-cyan {
  color: var(--accent-cyan);
  text-shadow: 0 0 20px var(--accent-glow-c);
}

.text-neon-magenta {
  color: var(--accent-magenta);
  text-shadow: 0 0 20px var(--accent-glow-m);
}

.text-gradient {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-magenta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===========================================
   LAYOUT UTILITIES
   =========================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--section-padding) 0;
  position: relative;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--content-gap);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--content-gap);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--content-gap);
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--content-gap);
}

/* Section headers */
.section-header {
  text-align: center;
  margin-bottom: clamp(2rem, 5vw, 4rem);
}

.section-header h2 {
  margin-bottom: var(--element-gap);
}

.section-header p {
  max-width: 600px;
  margin: 0 auto;
  font-size: var(--text-body);
  color: var(--text-muted);
}

.section-badge {
  display: inline-block;
  padding: 0.3em 1em;
  border: 1px solid var(--accent-cyan);
  border-radius: 50px;
  color: var(--accent-cyan);
  font-size: var(--text-small);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--element-gap);
  box-shadow: 0 0 12px var(--accent-glow-c);
}

/* Divider */
.divider {
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-magenta));
  margin: calc(var(--element-gap) * 2) auto;
  border-radius: 2px;
}

/* ===========================================
   GRID OVERLAY (subtle)
   =========================================== */
.grid-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  opacity: 0.03;
  background-image:
    linear-gradient(rgba(0,255,204,0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,255,204,0.3) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ===========================================
   SCROLL REVEAL ANIMATION BASE
   =========================================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity var(--duration-normal) var(--ease-out-expo),
    transform var(--duration-normal) var(--ease-out-expo);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children for sequential reveal */
.reveal-stagger > .reveal:nth-child(1) { transition-delay: 0.05s; }
.reveal-stagger > .reveal:nth-child(2) { transition-delay: 0.15s; }
.reveal-stagger > .reveal:nth-child(3) { transition-delay: 0.25s; }
.reveal-stagger > .reveal:nth-child(4) { transition-delay: 0.35s; }
.reveal-stagger > .reveal:nth-child(5) { transition-delay: 0.45s; }
.reveal-stagger > .reveal:nth-child(6) { transition-delay: 0.55s; }

/* ===========================================
   RESPONSIVE BREAKPOINTS
   =========================================== */
@media (max-width: 1024px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

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

  .section {
    padding: clamp(2rem, 5vw, 3rem) 0;
  }
}

/* ===========================================
   REDUCED MOTION
   =========================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.2s !important;
  }

  html {
    scroll-behavior: auto;
  }
}