/* CSS Custom Properties for Theme System */
:root {
  /* Trezor Green Theme (Default) */
  --color-primary: #00854D;
  --color-secondary: #F8FAF9;
  --color-accent: #007A45;
  --color-text: #1F2937;
  --color-text-light: #6B7280;
  --color-background: #FFFFFF;
  --color-surface: #F9FAFB;
}

/* Theme Variations */
[data-theme="ocean"] {
  --color-primary: #0EA5E9;
  --color-secondary: #F0F9FF;
  --color-accent: #0284C7;
  --color-text: #1E293B;
  --color-text-light: #64748B;
  --color-background: #FFFFFF;
  --color-surface: #F8FAFC;
}

[data-theme="sunset"] {
  --color-primary: #F97316;
  --color-secondary: #FFF7ED;
  --color-accent: #EA580C;
  --color-text: #1C1917;
  --color-text-light: #78716C;
  --color-background: #FFFFFF;
  --color-surface: #FEF7F0;
}

[data-theme="purple"] {
  --color-primary: #8B5CF6;
  --color-secondary: #F5F3FF;
  --color-accent: #7C3AED;
  --color-text: #1F1A24;
  --color-text-light: #6B7280;
  --color-background: #FFFFFF;
  --color-surface: #FAFAFA;
}

[data-theme="dark"] {
  --color-primary: #10B981;
  --color-secondary: #111827;
  --color-accent: #059669;
  --color-text: #F9FAFB;
  --color-text-light: #D1D5DB;
  --color-background: #0F172A;
  --color-surface: #1E293B;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  transition: all 0.3s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Theme Switcher Styles */
.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  background-color: var(--color-primary);
  color: white;
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: all 0.2s ease;
}

.theme-toggle:hover {
  transform: scale(1.1);
}

.theme-panel {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 999;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}

.theme-panel.active {
  transform: translateX(-60px);
}

.theme-panel-content {
  background-color: var(--color-surface);
  border: 1px solid var(--color-primary);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  min-width: 200px;
}

.theme-panel h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.theme-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.theme-btn {
  background: transparent;
  border: none;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  text-align: left;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--color-text);
}

.theme-btn:hover {
  background-color: var(--color-secondary);
}

.theme-btn.active {
  background-color: var(--color-primary);
  color: white;
  font-weight: 600;
}

/* Header Styles */
.header {
  border-bottom: 1px solid var(--color-secondary);
  background-color: var(--color-background);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.logo svg {
  color: var(--color-primary);
}

.nav-desktop {
  display: none;
  gap: 2rem;
}

.nav-link {
  text-decoration: none;
  color: var(--color-text-light);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--color-text);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.currency {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--color-secondary);
  color: var(--color-primary);
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-secondary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.btn-secondary svg {
  transition: transform 0.2s ease;
}

.btn-secondary:hover svg {
  transform: translateX(4px);
}

.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger {
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  transition: all 0.3s ease;
}

.mobile-menu {
  display: none;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-secondary);
}

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

.mobile-menu-content {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mobile-nav-link {
  text-decoration: none;
  color: var(--color-text-light);
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.mobile-nav-link:hover {
  color: var(--color-text);
}

/* Hero Section */
.hero {
  padding: 4rem 0 6rem;
}

.hero-content {
  max-width: 48rem;
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

.hero-description {
  font-size: 1.125rem;
  color: var(--color-text-light);
  margin-bottom: 2rem;
  max-width: 32rem;
}

.hero-buttons {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* How it works section */
.how-it-works {
  padding: 4rem 0;
  background-color: var(--color-surface);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 3rem;
  color: var(--color-text);
}

.steps-grid {
  display: grid;
  gap: 2rem;
}

.step-card {
  background-color: var(--color-background);
  padding: 2rem;
  border-radius: 12px;
  transition: all 0.2s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.step-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.step-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.step-number {
  background-color: var(--color-primary);
  color: white;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.875rem;
  flex-shrink: 0;
}

.step-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.step-description {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* Expert Section */
.expert-section {
  padding: 4rem 0;
}

.expert-grid {
  display: grid;
  gap: 3rem;
  align-items: center;
}

.expert-image {
  position: relative;
}

.expert-image img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: 12px;
}

.expert-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--color-text);
  line-height: 1.2;
}

.features-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.check-icon {
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.feature-item span {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.expert-btn {
  margin-bottom: 0.75rem;
}

.expert-note {
  font-size: 0.75rem;
  color: var(--color-text-light);
}

/* Footer */
.footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-secondary);
  padding: 3rem 0;
}

.footer-grid {
  display: grid;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 1rem;
}

.footer-logo svg {
  color: var(--color-primary);
}

.footer-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.footer-title {
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links a {
  text-decoration: none;
  color: var(--color-text-light);
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  border-top: 1px solid var(--color-secondary);
  padding-top: 2rem;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* Responsive Design */
@media (min-width: 640px) {
  .hero-buttons {
    flex-direction: row;
  }
  
  .hero-title {
    font-size: 3.5rem;
  }
}

@media (min-width: 768px) {
  .nav-desktop {
    display: flex;
  }
  
  .mobile-menu-btn {
    display: none;
  }
  
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .expert-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .expert-image img {
    height: 400px;
  }
  
  .footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 2rem;
  }
  
  .hero {
    padding: 6rem 0 8rem;
  }
  
  .hero-title {
    font-size: 4rem;
  }
  
  .expert-title {
    font-size: 2.5rem;
  }
}

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

.step-card {
  animation: fadeInUp 0.6s ease-out forwards;
}

.step-card:nth-child(1) { animation-delay: 0.1s; }
.step-card:nth-child(2) { animation-delay: 0.2s; }
.step-card:nth-child(3) { animation-delay: 0.3s; }
.step-card:nth-child(4) { animation-delay: 0.4s; }

/* Focus states for accessibility */
button:focus,
button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

a:focus,
a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Loading animation for theme changes */
body.theme-changing {
  pointer-events: none;
}

body.theme-changing * {
  transition: all 0.3s ease !important;
}

/* Enhanced hover effects */
.step-card:hover .step-number {
  transform: scale(1.1);
}

.feature-item:hover .check-icon {
  transform: scale(1.1);
}

/* Mobile optimizations */
@media (max-width: 640px) {
  .theme-panel.active {
    transform: translateX(-16px);
  }
  
  .theme-panel-content {
    padding: 1rem;
    min-width: 180px;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .expert-title {
    font-size: 1.75rem;
  }
}