/* ==========================================================================
   Base Styles and Variables
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  /* Color Palette - Premium Blue & Dark Theme */
  --bg-primary: #050a15;       /* Deep dark blue/almost black */
  --bg-secondary: #0f1627;     /* Lighter dark blue for sections/cards */
  --bg-tertiary: #172136;      /* Even lighter for hovers */
  
  --text-primary: #ffffff;
  --text-secondary: #a0aec0;   
  --text-muted: #718096;
  
  --accent-primary: #2563eb;   /* Strong visual blue */
  --accent-secondary: #06b6d4; /* Cyan/Teal accent */
  --accent-glow: rgba(37, 99, 235, 0.4);
  
  --accent-gradient: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  --accent-gradient-text: linear-gradient(135deg, #60a5fa 0%, #22d3ee 100%);
  
  --border-light: rgba(255, 255, 255, 0.08);
  --glass-bg: rgba(15, 22, 39, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);

  /* Typography */
  --font-body: 'Inter', sans-serif;
  --font-heading: 'Outfit', sans-serif;
  
  /* Utilities */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 20px;
  --box-shadow-glow: 0 0 20px rgba(37, 99, 235, 0.2);
}

/* Reset & Setup */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-normal);
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 5%;
}

.section-padding {
  padding: 100px 0;
}

/* Typography Utilities */
.text-gradient {
  background: var(--accent-gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  text-align: center;
}

.section-subtitle {
  color: var(--text-secondary);
  text-align: center;
  max-width: 600px;
  margin: 0 auto 3rem auto;
  font-size: 1.125rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-family: var(--font-heading);
  cursor: pointer;
  transition: var(--transition-normal);
  border: none;
  outline: none;
  font-size: 1rem;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.5);
}

.btn-outline {
  background: transparent;
  color: white;
  border: 1px solid var(--glass-border);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: white;
}

/* Cards / Glassmorphism */
.glass-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius-md);
  padding: 2rem;
  transition: var(--transition-normal);
}

.glass-card:hover {
  transform: translateY(-5px);
  border-color: rgba(37, 99, 235, 0.4);
  box-shadow: var(--box-shadow-glow);
  background: var(--bg-tertiary);
}

/* Header & Nav */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 20px 0;
  transition: var(--transition-normal);
  border-bottom: 1px solid transparent;
}

.header.scrolled {
  background: rgba(5, 10, 21, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 15px 0;
  border-bottom: 1px solid var(--glass-border);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  color: white;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo span {
  color: var(--accent-secondary);
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: white;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--accent-gradient);
  transition: var(--transition-normal);
}

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

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Responsive utilities */
@media (max-width: 991px) {
  .nav-links {
    position: fixed;
    top: 70px;
    right: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--bg-primary);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
    gap: 2rem;
  }

  .nav-links.active {
    right: 0;
  }

  .nav-links a {
    font-size: 1.25rem;
  }

  .mobile-menu-btn {
    display: block;
  }
}