:root {
  --primary-600: #1976d2;
  --primary-700: #1565c0;
  --primary-50: #e3f2fd;
  --primary-100: #bbdefb;
  
  --secondary-600: #f57c00;
  --secondary-700: #ef6c00;
  --secondary-50: #fff3e0;
  --secondary-100: #ffe0b2;
  
  --surface: #ffffff;
  --surface-variant: #f5f5f5;
  --surface-container: #fafafa;
  --surface-container-high: #f0f0f0;
  
  --on-surface: #1c1b1f;
  --on-surface-variant: #49454f;
  --outline: #79747e;
  --outline-variant: #cac4d0;
  
  --success: #4caf50;
  --warning: #ff9800;
  --error: #f44336;
  
  --shadow-1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --shadow-2: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
  --shadow-3: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
  --shadow-4: 0 14px 28px rgba(0,0,0,0.25), 0 10px 10px rgba(0,0,0,0.22);
  
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
  --border-radius-xl: 24px;
  
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Roboto', 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--surface-container);
  margin: 0;
  color: var(--on-surface);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography Scale */
.display-large { font-size: 57px; line-height: 64px; font-weight: 400; }
.display-medium { font-size: 45px; line-height: 52px; font-weight: 400; }
.display-small { font-size: 36px; line-height: 44px; font-weight: 400; }
.headline-large { font-size: 32px; line-height: 40px; font-weight: 400; }
.headline-medium { font-size: 28px; line-height: 36px; font-weight: 400; }
.headline-small { font-size: 24px; line-height: 32px; font-weight: 400; }
.title-large { font-size: 22px; line-height: 28px; font-weight: 500; }
.title-medium { font-size: 16px; line-height: 24px; font-weight: 500; }
.title-small { font-size: 14px; line-height: 20px; font-weight: 500; }
.body-large { font-size: 16px; line-height: 24px; font-weight: 400; }
.body-medium { font-size: 14px; line-height: 20px; font-weight: 400; }
.body-small { font-size: 12px; line-height: 16px; font-weight: 400; }

/* Header */
header {
  background: var(--surface);
  box-shadow: var(--shadow-1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-2xl);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--outline-variant);
  backdrop-filter: blur(8px);
}

.logo img {
  height: 40px;
  vertical-align: middle;
}

nav {
  display: flex;
  gap: var(--spacing-xl);
  align-items: center;
}

nav a {
  color: var(--on-surface-variant);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

nav a:hover {
  background: var(--primary-50);
  color: var(--primary-600);
}

nav a.active {
  color: var(--primary-600);
  background: var(--primary-50);
}

.lang-switch {
  background: var(--surface);
  color: var(--primary-600);
  border: 2px solid var(--primary-600);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: none;
}

.lang-switch:hover {
  background: var(--primary-50);
  box-shadow: var(--shadow-1);
}

/* Hero Section */
.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(135deg, var(--surface) 0%, var(--primary-50) 100%);
  padding: var(--spacing-3xl) var(--spacing-2xl);
  min-height: 600px;
  gap: var(--spacing-3xl);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: radial-gradient(circle at center, var(--primary-50) 0%, transparent 70%);
  opacity: 0.5;
}

.hero-content {
  flex: 1;
  text-align: left;
  max-width: 600px;
  z-index: 2;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  color: var(--primary-700);
  margin: 0 0 var(--spacing-lg) 0;
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.hero p {
  font-size: 1.25rem;
  color: var(--on-surface-variant);
  margin-bottom: var(--spacing-xl);
  font-weight: 400;
  line-height: 1.5;
}

.cta-btn {
  background: var(--primary-600);
  color: var(--surface);
  border: none;
  font-size: 16px;
  font-weight: 500;
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-md) var(--spacing-xl);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-2);
  text-transform: none;
  letter-spacing: 0.5px;
}

.cta-btn:hover {
  background: var(--primary-700);
  box-shadow: var(--shadow-3);
  transform: translateY(-2px);
}

.cta-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-1);
}

.hero-img {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-2);
  min-height: 400px;
  position: relative;
  z-index: 2;
}

/* Section Titles */
.section-title {
  text-align: center;
  color: var(--primary-600);
  font-size: clamp(2rem, 4vw, 2.5rem);
  margin: 0;
  padding: 32px 0 12px 0;
  font-weight: 400;
  letter-spacing: -0.01em;
  width: 100%;
}

/* Features Section */
.features {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--surface-container);
  padding: var(--spacing-sm) var(--spacing-sm);
  max-width: 1800px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--spacing-lg);
  width: 100%;
  margin-top: var(--spacing-2xl);
}
@media (max-width: 1600px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (max-width: 1100px) {
  .features-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
  }
}

.feature-card {
  background: var(--surface);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-1);
  padding: 20px 16px;
  min-width: 0;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  text-align: center;
  border: 1px solid var(--outline-variant);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-600);
  transform: scaleX(0);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
  box-shadow: var(--shadow-3);
  transform: translateY(-4px);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-card .icon {
  font-size: 4.5rem;
  margin: var(--spacing-lg) 0 0 0;
  color: var(--primary-600);
  background: var(--primary-50);
  width: 120px;
  height: 120px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: auto;
  margin-right: auto;
  padding: 12px;
  box-sizing: border-box;
}

.feature-card .icon .material-icons {
  font-size: 3.5rem;
  width: 1em;
  height: 1em;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-card h3 {
  font-size: 1.25rem;
  color: var(--on-surface);
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  line-height: 1.3;
}

.feature-card p {
  font-size: 1rem;
  color: var(--on-surface-variant);
  margin: 0;
  line-height: 1.5;
}

/* How It Works Section */
.how-diagram {
  background: var(--surface-container);
  padding: var(--spacing-3xl) var(--spacing-lg);
  text-align: center;
}

.how-chain {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  justify-content: center;
  gap: 16px;
  flex-wrap: nowrap;
  margin: var(--spacing-2xl) auto;
  max-width: 1800px;
  padding: 0 var(--spacing-2xl);
  box-sizing: border-box;
  width: 100%;
}
@media (max-width: 1400px) {
  .how-chain {
    flex-wrap: wrap;
    gap: 24px;
  }
}

.how-step-chain {
  background: var(--surface);
  border: 1px solid var(--outline-variant);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-1);
  width: 220px;
  min-width: 0;
  height: 260px;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  text-align: center;
  flex: 1;
  max-width: 240px;
}
.how-step-num {
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--primary-600);
  margin: 0 0 16px 0;
  background: var(--primary-50);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  top: 8px;
}

.how-step-title {
  font-size: 0.85rem;
  color: var(--on-surface);
  font-weight: 500;
  text-align: center;
  line-height: 1.2;
  word-break: break-word;
  white-space: normal;
  margin: 0;
  padding: 0 2px;
  max-width: 100%;
}

.how-step-chain:hover {
  box-shadow: var(--shadow-3);
  transform: translateY(-4px);
  border-color: var(--primary-600);
}

.how-icon {
  min-height: 64px;
  margin: 16px 0 8px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.how-icon .material-icons {
  font-size: 3.5rem;
  color: var(--primary-600);
}

.how-step-num {
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--primary-600);
  margin: 0 0 16px 0;
  background: var(--primary-50);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  top: 8px;
}

.how-step-title {
  font-size: 0.875rem;
  color: var(--on-surface);
  font-weight: 500;
  text-align: center;
  line-height: 1.3;
}

.arrow {
  font-size: 1.75rem;
  color: var(--primary-600);
  font-weight: 900;
  margin: 0 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  align-self: center;
  text-shadow: 0 0 1px rgba(0,0,0,0.2);
}

/* Screenshot Section */
.screenshot-slider {
  width: 100%;
  max-width: 800px;
  height: 450px;
  margin: var(--spacing-xl) auto;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-2);
  border: 1px solid var(--outline-variant);
}

.screenshot-slider img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: opacity 0.3s ease;
  cursor: pointer;
}

.screenshot-tooltip {
  display: none;
  position: absolute;
  left: 50%;
  bottom: var(--spacing-lg);
  transform: translateX(-50%);
  background: var(--surface);
  color: var(--on-surface);
  border: 1px solid var(--outline-variant);
  box-shadow: var(--shadow-2);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  max-width: 300px;
  font-size: 0.875rem;
  z-index: 12;
  pointer-events: none;
  text-align: center;
}

/* Clients Section */
.how-it-works {
  background: var(--surface);
  padding: var(--spacing-3xl) var(--spacing-2xl) 16px var(--spacing-2xl);
  text-align: center;
  margin-bottom: 0;
}

.clients {
  background: var(--surface);
  padding: 24px var(--spacing-2xl) 0 var(--spacing-2xl);
  text-align: center;
  margin: 0;
}

.client-logos {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  justify-content: center;
  align-items: center;
  gap: 32px;
  margin: var(--spacing-2xl) auto;
  max-width: 1700px;
  width: 100%;
  padding: 0 16px;
  box-sizing: border-box;
}
@media (max-width: 1400px) {
  .client-logos {
    flex-wrap: wrap;
    gap: 24px;
  }
}

.client-logo {
  height: 80px;
  min-width: 180px;
  max-width: 240px;
  background: var(--surface);
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--outline-variant);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 12px 18px;
  box-sizing: border-box;
}

.client-logo:hover {
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}

.client-logo img {
  max-width: 100%;
  max-height: 50px;
  width: auto;
  height: auto;
  object-fit: contain;
}

.logo-multibank {
  background: #c4122f;
  border: none;
}

.testimonial {
  margin: 16px auto 0 auto;
  max-width: 600px;
  color: var(--on-surface-variant);
  font-style: italic;
  font-size: 1.125rem;
  line-height: 1.6;
}

.testi-name {
  color: var(--on-surface);
  font-style: normal;
  font-weight: 500;
  margin-top: var(--spacing-md);
  font-size: 1rem;
}

/* Resellers Section */
.resellers {
  background: var(--surface-container);
  padding: 32px var(--spacing-2xl) var(--spacing-3xl) var(--spacing-2xl);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-top: 0;
}

#reseller-benefits {
  list-style: none;
  padding: 0;
  margin: 8px 0 32px 0;
  max-width: 480px;
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  text-align: left;
  display: block;
}

#reseller-benefits li {
  color: var(--on-surface);
  font-size: 1.125rem;
  margin: 0.6em 0 0.6em 0;
  padding: 0 0 0 2.2em;
  text-align: left;
  position: relative;
  background: none;
  border-radius: 0;
  box-shadow: none;
  border-left: none;
}

#reseller-benefits li::before {
  content: '✓';
  color: var(--success);
  font-weight: bold;
  position: absolute;
  left: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  background: var(--success);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}

#reseller-benefits li {
  padding-left: var(--spacing-2xl);
}

/* Footer */
footer {
  background: var(--surface);
  color: var(--on-surface);
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
  border-top: 1px solid var(--outline-variant);
  margin-top: var(--spacing-2xl);
}

.footer-logo img {
  height: 32px;
  margin-bottom: var(--spacing-md);
}

.contact-block {
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
  color: var(--on-surface-variant);
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
}

.footer-copy {
  color: var(--on-surface-variant);
  font-size: 0.875rem;
}

/* Modal Styles */
.modal-bg {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  backdrop-filter: blur(4px);
}

.modal-form {
  background: var(--surface);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-4);
  padding: var(--spacing-2xl);
  width: 90vw;
  max-width: 500px;
  text-align: left;
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-form h3 {
  margin-top: 0;
  color: var(--primary-600);
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: var(--spacing-lg);
}

.modal-form label {
  font-weight: 500;
  display: block;
  margin-top: var(--spacing-md);
  color: var(--on-surface);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-xs);
}

.modal-form input,
.modal-form textarea {
  width: 100%;
  font-size: 1rem;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--outline-variant);
  padding: var(--spacing-md);
  font-family: inherit;
  transition: border-color 0.2s ease;
  background: var(--surface);
  color: var(--on-surface);
}

.modal-form input:focus,
.modal-form textarea:focus {
  outline: none;
  border-color: var(--primary-600);
  box-shadow: 0 0 0 2px var(--primary-50);
}

.modal-actions {
  margin-top: var(--spacing-xl);
  text-align: right;
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
}

.modal-actions button {
  margin: 0;
}

.success-msg {
  background: var(--success);
  color: white;
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-sm);
  text-align: center;
  font-size: 1rem;
  margin-top: var(--spacing-md);
  box-shadow: var(--shadow-1);
}

.privacy-block {
  margin-top: var(--spacing-lg);
  background: var(--surface-variant);
  border: 1px solid var(--outline-variant);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-md);
  font-size: 0.875rem;
}

.privacy-notice {
  color: var(--on-surface-variant);
  margin-bottom: var(--spacing-md);
  line-height: 1.4;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  font-size: 0.875rem;
}

.checkbox-group input[type="checkbox"] {
  width: auto;
  margin: 0;
  accent-color: var(--primary-600);
}

.privacy-warning {
  color: var(--error);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
}

/* Tooltips */
.how-tooltip {
  display: none;
  position: absolute;
  background: var(--surface);
  color: var(--on-surface);
  border: 1px solid var(--outline-variant);
  box-shadow: var(--shadow-2);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-md);
  max-width: 250px;
  font-size: 0.875rem;
  z-index: 999;
  text-align: left;
  pointer-events: none;
  line-height: 1.4;
}

/* Responsive Design */
@media (max-width: 768px) {
  header {
    padding: var(--spacing-md);
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  nav {
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .hero {
    flex-direction: column;
    padding: var(--spacing-2xl) var(--spacing-md);
    text-align: center;
    min-height: auto;
  }
  
  .hero-content {
    max-width: 100%;
  }
  
  .hero-img {
    width: 100%;
    min-height: 300px;
  }
  
  .features {
    grid-template-columns: 1fr;
    padding: var(--spacing-2xl) var(--spacing-md);
  }
  
  .how-chain {
    flex-direction: column;
    gap: var(--spacing-lg);
  }
  
  .arrow {
    transform: rotate(90deg);
  }
  
  .client-logos {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .contact-block {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .modal-form {
    margin: var(--spacing-md);
    width: calc(100vw - 32px);
  }
  
  .modal-actions {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .how-step-chain {
    width: 140px;
    height: 140px;
  }
  
  .screenshot-slider {
    height: 250px;
  }
}

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

.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

/* Focus styles for accessibility */
*:focus-visible {
  outline: 2px solid var(--primary-600);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --outline-variant: #000000;
    --on-surface-variant: #000000;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}