/* =============================================
   AUTOEXPLAIN ANNIVERSARY — DESIGN SYSTEM
   ============================================= */

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

:root {
  --font-heading: 'Orbitron', sans-serif;
  --font-body: 'Inter', sans-serif;
  --brand-blue: #004AAD;
  --brand-navy: #0B1F3A;
  --brand-gold: #FFB800;
  --brand-orange: #FF6B00;
  --brand-orange-hover: #E65C00;
  --brand-green: #22C55E;
  --brand-soft: #F7F8FD;
  --brand-border: #D9E2F2;
  --text-primary: #1E293B;
  --text-secondary: #64748B;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--text-primary);
  background-color: var(--brand-soft);
  line-height: 1.6;
}

img { max-width: 100%; height: auto; }
a { text-decoration: none; }
ul { list-style: none; }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--brand-soft); }
::-webkit-scrollbar-thumb { background: var(--brand-blue); border-radius: 3px; }

/* =============================================
   TYPOGRAPHY
   ============================================= */
.font-heading { font-family: var(--font-heading); }

.section-heading {
  font-family: var(--font-heading);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  color: var(--text-primary);
  line-height: 1.2;
}

/* =============================================
   BUTTONS
   ============================================= */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--brand-orange);
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 1rem 2rem;
  border-radius: 0.5rem;
  border: none;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s, transform 0.1s;
  font-size: 0.875rem;
  text-decoration: none;
}
.btn-primary:hover {
  background: var(--brand-orange-hover);
  box-shadow: 0 8px 24px rgba(255,107,0,0.3);
  color: #fff;
}
.btn-primary:active { transform: scale(0.97); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--brand-soft);
  font-family: var(--font-heading);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 1rem 2rem;
  border-radius: 0.5rem;
  border: 2px solid rgba(247,248,253,0.5);
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  font-size: 0.875rem;
  text-decoration: none;
}
.btn-secondary:hover { background: rgba(255,255,255,0.1); color: #fff; }
.btn-secondary:active { transform: scale(0.97); }

.btn-outline-blue {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--brand-blue);
  font-family: var(--font-heading);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  border: 2px solid var(--brand-blue);
  cursor: pointer;
  transition: background 0.2s, color 0.2s, transform 0.1s;
  font-size: 0.875rem;
  text-decoration: none;
}
.btn-outline-blue:hover { background: var(--brand-blue); color: #fff; }
.btn-outline-blue:active { transform: scale(0.97); }

/* =============================================
   CARDS
   ============================================= */
.card {
  background: #fff;
  border: 1px solid var(--brand-border);
  border-radius: 1rem;
  transition: box-shadow 0.3s, transform 0.3s;
}
.card:hover {
  box-shadow: 0 20px 40px rgba(0,74,173,0.1);
  transform: translateY(-4px);
}

/* =============================================
   BADGES
   ============================================= */
.tech-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: rgba(0,74,173,0.1);
  color: var(--brand-blue);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
}

/* =============================================
   HERO GRADIENT
   ============================================= */
.bg-hero-gradient {
  background: linear-gradient(135deg, var(--brand-navy) 0%, var(--brand-blue) 60%, #003380 100%);
}

/* =============================================
   GOLD SHIMMER
   ============================================= */
@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}
.gold-shimmer {
  background: linear-gradient(90deg, #FFB800 0%, #FFD966 40%, #FFB800 60%, #FFD966 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 3s linear infinite;
}

/* =============================================
   REVEAL ANIMATIONS
   ============================================= */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =============================================
   LAYOUT UTILITIES
   ============================================= */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}
@media (min-width: 640px) { .container { padding: 0 1.5rem; } }
@media (min-width: 1024px) { .container { padding: 0 2rem; } }

.grid-2 { display: grid; grid-template-columns: 1fr; gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: 1fr; gap: 2rem; }
.grid-4 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}
@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

/* Text colors */
.text-brand-blue { color: var(--brand-blue); }
.text-brand-gold { color: var(--brand-gold); }
.text-brand-orange { color: var(--brand-orange); }
.text-brand-green { color: var(--brand-green); }
.text-white { color: #fff; }
.text-muted { color: var(--text-secondary); }

/* Bg colors */
.bg-brand-soft { background-color: var(--brand-soft); }
.bg-brand-navy { background-color: var(--brand-navy); }
.bg-brand-blue { background-color: var(--brand-blue); }
.bg-white { background-color: #fff; }
.bg-brand-orange { background-color: var(--brand-orange); }
.bg-brand-green { background-color: var(--brand-green); }