/* ========================================
   BASE STYLES - Shared across all pages
   ======================================== */

/* CSS Variables */
:root {
  /* Colors */
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-primary-darker: #1e40af;
  --color-success: #10b981;
  --color-text: #111827;
  --color-text-secondary: #374151;
  --color-text-muted: #6b7280;
  --color-text-light: #9ca3af;
  --color-bg: #ffffff;
  --color-bg-subtle: rgba(255, 255, 255, 0.9);
  --color-border: rgba(0, 0, 0, 0.05);
  --color-border-strong: rgba(0, 0, 0, 0.1);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #3b82f6, #2563eb);
  --gradient-primary-extended: linear-gradient(135deg, #3b82f6, #2563eb, #1e40af);
  --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(255,255,255,0.7));

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-primary: 0 4px 14px rgba(59, 130, 246, 0.35);
  --shadow-primary-lg: 0 8px 30px rgba(59, 130, 246, 0.25);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --container-padding: 24px;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
}

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

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

body {
  font-family: var(--font-family);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  background: var(--color-bg) url('../assets/grid_bg.png') repeat;
  background-size: 550px;
  overflow-x: hidden;
}

html {
  overflow-x: hidden;
}

main {
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

/* Grid Background */
.grid-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('../assets/grid_bg.png');
  background-repeat: repeat;
  background-size: 550px;
  opacity: 0.4;
  z-index: -1;
  pointer-events: none;
}

/* ========================================
   NAVIGATION
   ======================================== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 14px var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  transition: opacity var(--transition-base);
}

.nav-logo:hover {
  opacity: 0.8;
}

.nav-logo img {
  height: 36px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: var(--space-xl);
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

.nav-links a:hover {
  color: var(--color-primary);
}

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

.nav-links a.active {
  color: var(--color-primary);
}

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

.nav-cta {
  background: var(--gradient-primary);
  color: white;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--font-size-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  box-shadow: var(--shadow-primary);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.45);
}

/* Hamburger menu button */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile menu */
.mobile-menu {
  position: fixed;
  top: 65px;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 0 var(--space-lg);
  flex-direction: column;
  gap: var(--space-md);
  box-shadow: var(--shadow-lg);
  z-index: 999;
  border-bottom: 1px solid var(--color-border);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.3s ease, opacity 0.3s ease, padding 0.3s ease;
  display: flex;
}

.mobile-menu.active {
  max-height: 300px;
  opacity: 1;
  padding: var(--space-lg);
}

.mobile-menu a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 1rem;
  padding: var(--space-sm) 0;
  text-align: center;
}

.mobile-menu a:hover {
  color: var(--color-primary);
}

.mobile-menu .mobile-cta {
  background: var(--gradient-primary);
  color: white;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-full);
  margin-top: var(--space-sm);
}

/* Mobile menu button */
.nav-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  transition: var(--transition-base);
  border-radius: var(--radius-full);
}

/* ========================================
   MAIN CONTENT WRAPPER
   ======================================== */
main {
  position: relative;
  z-index: 1;
  padding-top: 64px;
}

/* ========================================
   CONTAINER UTILITIES
   ======================================== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* ========================================
   GLASS CARD COMPONENT
   ======================================== */
.glass-card {
  background: var(--gradient-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  padding: var(--space-xl);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--font-size-base);
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.45);
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
}

.btn-secondary:hover {
  background: #f9fafb;
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-lg {
  padding: 16px 32px;
  font-size: var(--font-size-lg);
  border-radius: var(--radius-lg);
}

/* ========================================
   STORE BUTTONS
   ======================================== */
.store-buttons {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.store-button {
  display: inline-block;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.store-button:hover {
  transform: scale(1.05);
}

.store-button img {
  height: 52px;
  width: auto;
}

/* ========================================
   SECTION STYLES
   ======================================== */
.section {
  padding: var(--space-4xl) var(--container-padding);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-3xl);
}

.section-header h2 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.section-header p {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
}

/* ========================================
   FOOTER
   ======================================== */
footer {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) var(--container-padding);
}

.footer-content {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.footer-logo img {
  height: 32px;
  opacity: 0.7;
}

.footer-links {
  display: flex;
  gap: var(--space-xl);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  transition: color var(--transition-base);
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-copyright {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

/* ========================================
   RESPONSIVE STYLES
   ======================================== */
@media (max-width: 900px) {
  :root {
    --container-padding: 20px;
  }

  .section {
    padding: var(--space-3xl) var(--container-padding);
  }

  .section-header h2 {
    font-size: var(--font-size-2xl);
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
  }

  .nav-cta {
    display: none;
  }

  .hamburger {
    display: flex;
  }

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

  .section-header h2 {
    font-size: var(--font-size-xl);
  }

  .footer-links {
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
  }

  .store-buttons {
    justify-content: center;
  }
}