/* Base Styles */
:root {
  /* Primary Color Palette - Dark Sea Green */
  --color-primary-900: #1a3c31;
  --color-primary-800: #20483b;
  --color-primary-700: #2a6154;
  --color-primary-600: #357a68;
  --color-primary-500: #40937c;
  --color-primary-400: #54ad95;
  --color-primary-300: #78c3af;
  --color-primary-200: #9dd8c9;
  --color-primary-100: #c2ece2;
  --color-primary-50: #e6f7f2;
  
  /* Accent Color */
  --color-accent: #f0b941;
  
  /* Neutral Colors */
  --color-black: #0a0a0a;
  --color-dark: #1a1a1a;
  --color-gray-dark: #333333;
  --color-gray: #666666;
  --color-gray-light: #999999;
  --color-light: #e0e0e0;
  --color-white: #ffffff;
  
  /* Status Colors */
  --color-success: #2ecc71;
  --color-warning: #f39c12;
  --color-error: #e74c3c;
  
  /* Font Sizes */
  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-md: 1rem;      /* 16px */
  --font-size-lg: 1.125rem;  /* 18px */
  --font-size-xl: 1.25rem;   /* 20px */
  --font-size-2xl: 1.5rem;   /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */
  --font-size-4xl: 2.25rem;  /* 36px */
  --font-size-5xl: 3rem;     /* 48px */
  
  /* Spacing (8px system) */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.5rem;    /* 24px */
  --space-6: 2rem;      /* 32px */
  --space-7: 2.5rem;    /* 40px */
  --space-8: 3rem;      /* 48px */
  --space-9: 4rem;      /* 64px */
  --space-10: 5rem;     /* 80px */
  
  /* Other Variables */
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 1rem;
  --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --box-shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

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

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

body {
  font-family: 'Inter', sans-serif;
  line-height: 1.5;
  color: var(--color-gray-dark);
  background-color: var(--color-white);
}

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

ul {
  list-style: none;
}

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

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  margin-bottom: var(--space-4);
  font-weight: 700;
  color: var(--color-primary-800);
}

h1 {
  font-size: var(--font-size-4xl);
}

h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-5);
  text-align: center;
}

h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-3);
}

h4 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-3);
}

p {
  margin-bottom: var(--space-4);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.section-description {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-6);
  color: var(--color-gray);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--border-radius-md);
  font-weight: 500;
  font-size: var(--font-size-md);
  cursor: pointer;
  text-align: center;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background-color: var(--color-primary-600);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-primary-700);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary-600);
  border: 2px solid var(--color-primary-600);
}

.btn-secondary:hover {
  background-color: var(--color-primary-50);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background-color: var(--color-white);
  color: var(--color-primary-700);
}

.btn-small {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background-color: var(--color-primary-800);
  padding: var(--space-4) 0;
}

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

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-white);
}

.main-nav ul {
  display: flex;
}

.main-nav li {
  margin-left: var(--space-5);
}

.main-nav a {
  color: var(--color-white);
  font-weight: 500;
  position: relative;
}

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

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

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-menu-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--color-white);
  margin: 5px 0;
  transition: var(--transition);
}

/* Hero Section */
.hero {
  padding: calc(var(--space-10) + 60px) 0 var(--space-10);
  background: linear-gradient(135deg, var(--color-primary-900) 0%, var(--color-primary-700) 100%);
  color: var(--color-white);
}

.hero-content {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.hero-text {
  flex: 1;
}

.hero-text h1 {
  color: var(--color-white);
  margin-bottom: var(--space-5);
}

.hero-text p {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-6);
  opacity: 0.9;
}

.hero-cta {
  display: flex;
  gap: var(--space-4);
}

.hero-image {
  flex: 1;
  max-height: 70vh;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--box-shadow-lg);
}

/* Products Section */
.products {
  padding: var(--space-10) 0;
  background-color: var(--color-primary-50);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
}

.product-card {
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--box-shadow-lg);
}

.product-card.featured {
  border: 2px solid var(--color-accent);
  position: relative;
}

.product-card.featured::before {
  content: 'Most Popular';
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background-color: var(--color-accent);
  color: var(--color-dark);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 700;
  z-index: 1;
}

.product-image {
  height: 220px;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-details {
  padding: var(--space-5);
}

.product-details h3 {
  margin-bottom: var(--space-2);
  color: var(--color-primary-800);
}

.product-details p {
  color: var(--color-gray);
  margin-bottom: var(--space-4);
  min-height: 48px;
}

.price {
  display: block;
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary-700);
  margin-bottom: var(--space-4);
}

/* Features Section */
.features {
  padding: var(--space-10) 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-6);
}

.feature-card {
  text-align: center;
  padding: var(--space-5);
  border-radius: var(--border-radius-lg);
  background-color: var(--color-white);
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--box-shadow-lg);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary-50);
  border-radius: 50%;
  color: var(--color-primary-700);
}

.feature-card h3 {
  margin-bottom: var(--space-3);
}

.feature-card p {
  color: var(--color-gray);
}

/* Security Section */
.security {
  padding: var(--space-10) 0;
  background-color: var(--color-primary-50);
}

.security-content {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.security-text {
  flex: 1;
}

.security-text h2 {
  text-align: left;
}

.security-text p {
  margin-bottom: var(--space-5);
}

.security-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.security-list li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.check-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background-color: var(--color-success);
  color: var(--color-white);
  border-radius: 50%;
  font-size: var(--font-size-sm);
}

.security-image {
  flex: 1;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--box-shadow-lg);
}

/* Cryptocurrency Support */
.crypto-support {
  padding: var(--space-10) 0;
}

.crypto-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-6);
}

.crypto-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.crypto-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background-color: var(--color-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-2);
}

.crypto-icon.bitcoin {
  background-color: #f7931a;
}

.crypto-icon.ethereum {
  background-color: #627eea;
}

.crypto-icon.litecoin {
  background-color: #345d9d;
}

.crypto-icon.ripple {
  background-color: #23292f;
}

.crypto-icon.cardano {
  background-color: #3cc8c8;
}

.crypto-icon.polkadot {
  background-color: #e6007a;
}

.crypto-icon.stellar {
  background-color: #7d00ff;
}

.crypto-icon.more {
  background-color: var(--color-primary-500);
  color: var(--color-white);
  font-weight: 700;
}

.crypto-item span {
  font-weight: 500;
}

/* Testimonials */
.testimonials {
  padding: var(--space-10) 0;
  background-color: var(--color-primary-50);
}

.testimonial-slider {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-6);
}

.testimonial-card {
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  padding: var(--space-6);
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.testimonial-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--box-shadow-lg);
}

.testimonial-text {
  margin-bottom: var(--space-4);
  font-style: italic;
  color: var(--color-gray-dark);
}

.testimonial-text p::before {
  content: '"';
  font-size: var(--font-size-3xl);
  color: var(--color-primary-300);
  line-height: 0;
  vertical-align: -0.4em;
  margin-right: var(--space-1);
}

.author-name {
  display: block;
  font-weight: 700;
  color: var(--color-primary-800);
}

.author-title {
  color: var(--color-gray);
  font-size: var(--font-size-sm);
}

/* Newsletter */
.newsletter {
  padding: var(--space-10) 0;
  background: linear-gradient(135deg, var(--color-primary-800) 0%, var(--color-primary-600) 100%);
  color: var(--color-white);
}

.newsletter-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.newsletter-content h2 {
  color: var(--color-white);
}

.newsletter-form {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.newsletter-form input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  border: none;
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-md);
}

.newsletter-form .btn {
  flex-shrink: 0;
}

/* Footer */
.footer {
  background-color: var(--color-primary-900);
  color: var(--color-light);
  padding: var(--space-9) 0 var(--space-6);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.footer-column h4 {
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.footer-logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.footer-column p {
  opacity: 0.8;
  margin-bottom: var(--space-5);
}

.footer-column ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-column a {
  color: var(--color-light);
  transition: var(--transition);
}

.footer-column a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

.social-icons {
  display: flex;
  gap: var(--space-3);
}

.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  color: var(--color-white);
  transition: var(--transition);
}

.social-icon:hover {
  background-color: var(--color-primary-500);
  transform: translateY(-3px);
}

.footer-bottom {
  padding-top: var(--space-5);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-links {
  display: flex;
  gap: var(--space-5);
}

/* Responsive Styles */
@media (max-width: 1024px) {
  h1 {
    font-size: var(--font-size-3xl);
  }
  
  h2 {
    font-size: var(--font-size-2xl);
  }
  
  .hero-content,
  .security-content {
    flex-direction: column;
  }
  
  .hero-image,
  .security-image {
    margin-top: var(--space-6);
  }
}

@media (max-width: 768px) {
  .header-cta {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .main-nav {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    background-color: var(--color-primary-800);
    padding: var(--space-4);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
  }
  
  .main-nav.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .main-nav ul {
    flex-direction: column;
    gap: var(--space-4);
  }
  
  .main-nav li {
    margin-left: 0;
  }
  
  .hero-cta {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta .btn {
    width: 100%;
  }
  
  .newsletter-form {
    flex-direction: column;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-links {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  :root {
    --space-10: 3rem;
    --space-9: 2.5rem;
  }
  
  h1 {
    font-size: var(--font-size-2xl);
  }
  
  h2 {
    font-size: var(--font-size-xl);
  }
  
  .testimonial-slider {
    grid-template-columns: 1fr;
  }
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-text, .hero-image, .product-card, .feature-card, .testimonial-card {
  animation: fadeIn 0.6s ease-out forwards;
}

.hero-image {
  animation-delay: 0.2s;
}

.product-card:nth-child(2) {
  animation-delay: 0.1s;
}

.product-card:nth-child(3) {
  animation-delay: 0.2s;
}

.feature-card:nth-child(2) {
  animation-delay: 0.1s;
}

.feature-card:nth-child(3) {
  animation-delay: 0.2s;
}

.feature-card:nth-child(4) {
  animation-delay: 0.3s;
}

.testimonial-card:nth-child(2) {
  animation-delay: 0.1s;
}

.testimonial-card:nth-child(3) {
  animation-delay: 0.2s;
}