/* ========================================
   AxiQuant AI - Main Stylesheet
   Dark Theme with Navy Blue & Gold
   ======================================== */

:root {
  /* Brand Colors */
  --primary-navy: #1e3a8a;
  --primary-gold: #d4a574;
  --accent-blue: #3b82f6;
  
  /* Dark Theme */
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --bg-card: rgba(31, 41, 55, 0.8);
  
  /* Text */
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-tertiary: #9ca3af;
  
  /* Effects */
  --glow-gold: rgba(212, 165, 116, 0.3);
  --glow-blue: rgba(59, 130, 246, 0.3);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  /* Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  
  /* Transitions */
  --transition: 0.3s ease;
}

/* ========================================
   Reset & Base
   ======================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Animated Background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 30%, rgba(30, 58, 138, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(59, 130, 246, 0.1) 0%, transparent 50%);
  z-index: -1;
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

p {
  color: var(--text-secondary);
  font-size: 1.125rem;
  line-height: 1.7;
}

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

a:hover {
  color: #e8c48f;
}

.text-gradient {
  background: linear-gradient(135deg, var(--primary-gold) 0%, #e8c48f 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========================================
   Layout
   ======================================== */

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

/* ========================================
   Header & Navigation
   ======================================== */

header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 14, 26, 0.7);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

header.scrolled {
  background: rgba(10, 14, 26, 0.95);
  border-bottom-color: rgba(59, 130, 246, 0.2);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  height: 80px;
}

.logo {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.logo-ai {
  color: var(--primary-gold);
  font-size: 1.5rem;
  font-weight: 800;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9375rem;
  padding: 0.5rem 0;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-gold);
  transition: var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-gold);
}

.btn-nav {
  padding: 0.75rem 1.75rem;
  background: linear-gradient(135deg, var(--primary-gold) 0%, #e8c48f 100%);
  color: var(--bg-primary);
  border-radius: var(--radius-sm);
  font-weight: 600;
  box-shadow: 0 4px 15px var(--glow-gold);
}

.btn-nav::after {
  display: none;
}

.btn-nav:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px var(--glow-gold);
  color: var(--bg-primary);
}

/* Mobile Menu */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 0.375rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-menu-btn span {
  display: block;
  width: 28px;
  height: 3px;
  background: var(--primary-gold);
  border-radius: 3px;
  transition: var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

.mobile-menu {
  position: fixed;
  top: 80px;
  left: 0;
  width: 100%;
  height: calc(100vh - 80px);
  background: rgba(10, 14, 26, 0.98);
  backdrop-filter: blur(20px);
  transform: translateX(-100%);
  transition: var(--transition);
  padding: 2rem;
}

.mobile-menu.open {
  transform: translateX(0);
}

.mobile-nav-menu {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.mobile-nav-link {
  display: block;
  color: var(--text-secondary);
  font-size: 1.25rem;
  font-weight: 500;
  padding: 1rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--primary-gold);
  background: rgba(212, 165, 116, 0.1);
}

/* ========================================
   Buttons
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-gold) 0%, #e8c48f 100%);
  color: var(--bg-primary);
  box-shadow: 0 4px 20px var(--glow-gold);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--glow-gold);
}

.btn-secondary {
  background: transparent;
  color: var(--primary-gold);
  border: 2px solid var(--primary-gold);
}

.btn-secondary:hover {
  background: var(--primary-gold);
  color: var(--bg-primary);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary-navy);
  color: var(--text-primary);
}

.btn-outline:hover {
  background: var(--primary-navy);
  border-color: var(--accent-blue);
}

/* ========================================
   Cards
   ======================================== */

.card {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  border: 1px solid rgba(59, 130, 246, 0.1);
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-8px);
  border-color: var(--primary-gold);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

/* ========================================
   Grid
   ======================================== */

.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

/* ========================================
   Footer
   ======================================== */

footer {
  background: var(--bg-secondary);
  border-top: 1px solid rgba(59, 130, 246, 0.2);
  padding: 4rem 0 2rem;
}

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

.footer-title {
  color: var(--primary-gold);
  font-size: 1.125rem;
  margin-bottom: 1.5rem;
  font-weight: 600;
}

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

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary-gold);
  padding-left: 0.5rem;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(59, 130, 246, 0.1);
  color: var(--text-tertiary);
  font-size: 0.875rem;
}

/* ========================================
   Animations
   ======================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.fade-in {
  animation: fadeIn 1s ease-out;
}

.fade-in-up {
  animation: fadeInUp 0.8s ease-out;
}

/* ========================================
   Scrollbar
   ======================================== */

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-navy);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-blue);
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
  }
  
  .nav-menu {
    display: none;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .section {
    padding: var(--spacing-lg) 0;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

/* ========================================
   Utility Classes
   ======================================== */

.text-center { text-align: center; }
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }