/* ═══════════════════════════════════════════════════════
   QUANDIA — Design System
   main.css
═══════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@300;400;500;600;700&display=swap');

/* ─── CSS Variables ─── */
:root {
  --primary:        #6C63FF;
  --primary-light:  #8B85FF;
  --primary-dark:   #4B44CC;
  --secondary:      #00D4FF;
  --secondary-dark: #00A8CC;
  --accent:         #A855F7;
  --accent-light:   #C084FC;
  --electric:       #38BDF8;

  --bg-deep:        #030712;
  --bg-dark:        #080F1A;
  --bg-card:        rgba(255,255,255,0.035);
  --bg-card-hover:  rgba(255,255,255,0.065);
  --glass:          rgba(255,255,255,0.04);
  --glass-border:   rgba(255,255,255,0.08);
  --glass-strong:   rgba(255,255,255,0.10);

  --text-primary:   #F1F5F9;
  --text-secondary: #CBD5E1;
  --text-muted:     #64748B;
  --text-dim:       #334155;

  --gradient-brand: linear-gradient(135deg, var(--primary), var(--accent));
  --gradient-cool:  linear-gradient(135deg, var(--secondary), var(--primary));
  --gradient-glow:  linear-gradient(135deg, var(--primary-dark), var(--bg-deep));

  --shadow-card:    0 8px 32px rgba(0,0,0,0.4);
  --shadow-glow:    0 0 40px rgba(108,99,255,0.25);
  --shadow-blue:    0 0 40px rgba(0,212,255,0.15);

  --radius-sm:      8px;
  --radius-md:      16px;
  --radius-lg:      24px;
  --radius-xl:      32px;
  --radius-full:    9999px;

  --transition:     all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast:all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow:all 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  --font-body:      'Inter', system-ui, sans-serif;
  --font-display:   'Space Grotesk', 'Inter', sans-serif;

  --container:      1200px;
  --section-py:     120px;
}

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

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

body {
  font-family: var(--font-body);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ─── Loading Screen ─── */
#loading-screen {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg-deep);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}
#loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
}
.loader-logo {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 2rem;
  letter-spacing: 0.15em;
}
.loader-neural {
  display: flex;
  gap: 8px;
  align-items: center;
}
.loader-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
  animation: neural-pulse 1.4s ease-in-out infinite;
}
.loader-dot:nth-child(2) { animation-delay: 0.2s; background: var(--secondary); }
.loader-dot:nth-child(3) { animation-delay: 0.4s; background: var(--accent); }
.loader-dot:nth-child(4) { animation-delay: 0.6s; background: var(--primary); }
.loader-dot:nth-child(5) { animation-delay: 0.8s; background: var(--secondary); }

/* ─── Container ─── */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ─── Section ─── */
.section {
  padding: var(--section-py) 0;
  position: relative;
}
.section-sm { padding: 80px 0; }
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--secondary);
  margin-bottom: 1rem;
}
.section-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gradient-cool);
  border-radius: 2px;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}
.section-title .gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}
.text-center { text-align: center; }
.text-center .section-subtitle { margin: 0 auto; }
.text-center .section-label { justify-content: center; }

/* ─── Gradient Text ─── */
.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.gradient-text-cool {
  background: var(--gradient-cool);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: var(--transition);
}
.btn:hover::before { opacity: 1; }

.btn-primary {
  background: var(--gradient-brand);
  color: white;
  box-shadow: 0 4px 24px rgba(108,99,255,0.4);
}
.btn-primary::before { background: rgba(255,255,255,0.1); }
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(108,99,255,0.5);
}

.btn-secondary {
  background: var(--glass);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
}
.btn-secondary:hover {
  background: var(--glass-strong);
  border-color: rgba(255,255,255,0.18);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--secondary);
  border: 1.5px solid var(--secondary);
}
.btn-outline:hover {
  background: rgba(0,212,255,0.1);
  box-shadow: 0 0 20px rgba(0,212,255,0.2);
  transform: translateY(-2px);
}

.btn-lg { padding: 18px 42px; font-size: 1rem; }
.btn-sm { padding: 10px 22px; font-size: 0.8rem; }

/* ─── Glass Card ─── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(108,99,255,0.05), transparent);
  opacity: 0;
  transition: var(--transition);
}
.card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(108,99,255,0.3);
  box-shadow: var(--shadow-glow);
  transform: translateY(-6px);
}
.card:hover::before { opacity: 1; }

/* ─── Divider ─── */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glass-border), transparent);
  margin: 0 auto;
}

/* ─── Badge ─── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.badge-primary {
  background: rgba(108,99,255,0.15);
  color: var(--primary-light);
  border: 1px solid rgba(108,99,255,0.25);
}
.badge-secondary {
  background: rgba(0,212,255,0.1);
  color: var(--secondary);
  border: 1px solid rgba(0,212,255,0.2);
}

/* ─── Grid Layouts ─── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ─── Background Decorations ─── */
.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  opacity: 0.08;
}
.bg-glow-primary { background: var(--primary); }
.bg-glow-secondary { background: var(--secondary); }
.bg-glow-accent { background: var(--accent); }

/* ─── Icon Box ─── */
.icon-box {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(108,99,255,0.1);
  border: 1px solid rgba(108,99,255,0.2);
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  transition: var(--transition);
  flex-shrink: 0;
}
.icon-box-lg {
  width: 72px;
  height: 72px;
  font-size: 2rem;
  border-radius: var(--radius-lg);
}
.card:hover .icon-box {
  background: rgba(108,99,255,0.2);
  box-shadow: 0 0 20px rgba(108,99,255,0.3);
}

/* ─── Stat Counter ─── */
.stat-number {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ─── Reveal animations (JS adds class) ─── */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal-left.revealed {
  opacity: 1;
  transform: translateX(0);
}
.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal-right.revealed {
  opacity: 1;
  transform: translateX(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ─── Responsive ─── */
@media (max-width: 1024px) {
  :root { --section-py: 80px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  :root { --section-py: 60px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; gap: 20px; }
  .btn-lg { padding: 15px 30px; font-size: 0.95rem; }
}
@media (max-width: 480px) {
  .container { padding: 0 16px; }
}