/**
 * SteamRF - Clean Fintech Dark Theme
 * Inspired by Plain, Graphite, Bolt.new
 */

/* ==========================================
   CSS Variables
   ========================================== */
:root {
  /* Colors */
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-tertiary: #1a1a1a;
  --bg-card: #141414;
  
  --text-primary: #ffffff;
  --text-secondary: #a1a1a1;
  --text-muted: #666666;
  
  --accent-primary: #10b981;
  --accent-hover: #059669;
  --accent-light: rgba(16, 185, 129, 0.1);
  
  --success: #10b981;
  --error: #ef4444;
  
  --border-color: #2a2a2a;
  --border-hover: #333333;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Other */
  --container-width: 1200px;
  --transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--accent-hover);
}

/* ==========================================
   Container
   ========================================== */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ==========================================
   Header
   ========================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

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

.nav-link {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color var(--transition);
}

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

/* ==========================================
   Hero
   ========================================== */
.hero {
  padding: var(--spacing-2xl) 0;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: start;
}

.hero-content {
  padding-top: var(--spacing-xl);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.75rem;
  background: var(--accent-light);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: 999px;
  color: var(--accent-primary);
  font-size: 0.8125rem;
  font-weight: 500;
  margin-bottom: var(--spacing-md);
}

.badge-dot {
  width: 6px;
  height: 6px;
  background: var(--accent-primary);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.hero-description {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.hero-features {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.hero-feature {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.hero-feature svg {
  flex-shrink: 0;
  color: var(--accent-primary);
}

/* ==========================================
   Payment Card
   ========================================== */
.payment-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--spacing-xl);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
}

.card-header h2 {
  font-size: 1.125rem;
  font-weight: 600;
}

.secure-badge {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.625rem;
  background: var(--accent-light);
  border-radius: 6px;
  color: var(--accent-primary);
  font-size: 0.75rem;
  font-weight: 500;
}

.payment-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
}

input, select {
  width: 100%;
  padding: 0.625rem 0.875rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: inherit;
  transition: all var(--transition);
}

input:focus, select:focus {
  outline: none;
  border-color: var(--accent-primary);
  background: var(--bg-primary);
}

input::placeholder {
  color: var(--text-muted);
}

/* Hide number input arrows */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="number"] {
  -moz-appearance: textfield;
}

.input-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Amount input group */
.amount-input-group {
  display: flex;
  gap: 0;
  position: relative;
}

.amount-input-group input {
  flex: 1;
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
  border-right: none;
}

.amount-input-group input:focus {
  border-right: 1px solid var(--accent-primary);
}

.currency-select {
  width: auto;
  min-width: 100px;
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
  padding-left: 0.75rem;
  padding-right: 0.75rem;
  cursor: pointer;
  font-weight: 500;
}

.currency-select:focus {
  border-left: 1px solid var(--accent-primary);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  user-select: none;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  padding: 0;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-secondary);
  cursor: pointer;
  position: relative;
  transition: all var(--transition);
  flex-shrink: 0;
}

.checkbox-label input[type="checkbox"]:hover {
  border-color: var(--border-hover);
}

.checkbox-label input[type="checkbox"]:checked {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.checkbox-label input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 6px;
  top: 2px;
  width: 4px;
  height: 9px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.checkbox-label input[type="checkbox"]:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-light);
}

.payment-summary {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: var(--spacing-md);
}

.summary-row {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  font-size: 0.875rem;
}

.summary-row:not(:last-child) {
  border-bottom: 1px solid var(--border-color);
}

.summary-row span:first-child {
  color: var(--text-secondary);
}

.summary-row span:last-child {
  color: var(--text-primary);
  font-weight: 500;
}

.summary-total {
  font-weight: 600;
  font-size: 0.9375rem;
}

.summary-total span:last-child {
  color: var(--accent-primary);
}

/* ==========================================
   Buttons
   ========================================== */
.btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.75rem 1.25rem;
  background: var(--accent-primary);
  border: none;
  border-radius: 8px;
  color: #ffffff;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  padding: 0.625rem 1.25rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-secondary:hover {
  background: var(--bg-card);
  border-color: var(--border-hover);
}

/* ==========================================
   Sections
   ========================================== */
.section {
  padding: var(--spacing-2xl) 0;
  border-top: 1px solid var(--border-color);
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

/* Steps */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--spacing-lg);
  text-align: center;
}

.step-number {
  width: 40px;
  height: 40px;
  margin: 0 auto var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  border-radius: 50%;
  color: var(--accent-primary);
  font-size: 1.125rem;
  font-weight: 700;
}

.step-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.step-card p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.feature-card {
  display: flex;
  align-items: start;
  gap: var(--spacing-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--spacing-lg);
  transition: all var(--transition);
}

.feature-card:hover {
  border-color: var(--border-hover);
}

.feature-card svg {
  flex-shrink: 0;
  color: var(--accent-primary);
  margin-top: 0.125rem;
}

.feature-card h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.8125rem;
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--spacing-lg);
  text-align: center;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* Testimonials */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--spacing-lg);
  transition: all var(--transition);
}

.testimonial-card:hover {
  border-color: var(--border-hover);
}

.testimonial-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.testimonial-avatar {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  border-radius: 50%;
  color: var(--accent-primary);
  overflow: hidden;
}

.testimonial-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.testimonial-info {
  flex: 1;
}

.testimonial-name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.125rem;
}

.testimonial-date {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.testimonial-text {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.testimonial-rating {
  display: flex;
  gap: 0.25rem;
}

.testimonial-rating svg {
  color: var(--accent-primary);
}

/* ==========================================
   Footer
   ========================================== */
.footer {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.footer-brand p {
  color: var(--text-secondary);
  margin-top: 0.375rem;
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.8125rem;
}

/* ==========================================
   Modal
   ========================================== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
}

.modal.active {
  display: flex;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  width: 100%;
  max-width: 440px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: var(--spacing-xl);
  animation: modalSlideIn 0.2s ease-out;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.modal-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.modal-body {
  text-align: center;
}

.loading-state, .success-state, .error-state {
  padding: var(--spacing-md) 0;
}

.spinner {
  width: 40px;
  height: 40px;
  margin: 0 auto var(--spacing-lg);
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-state h3, .success-state h3, .error-state h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.loading-state p, .success-state p, .error-state p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-lg);
}

.qr-container {
  width: 256px;
  height: 256px;
  margin: var(--spacing-lg) auto;
  position: relative;
}

.qr-container img {
  width: 100%;
  height: 100%;
  display: block;
}

/* QR Corners */
.qr-corner {
  position: absolute;
  width: 40px;
  height: 40px;
  pointer-events: none;
}

.qr-corner-tl {
  top: -15px;
  left: -15px;
  animation: scanCornerTL 2s ease-in-out infinite;
}

.qr-corner-tr {
  top: -15px;
  right: -15px;
  animation: scanCornerTR 2s ease-in-out infinite;
}

.qr-corner-bl {
  bottom: -15px;
  left: -15px;
  animation: scanCornerBL 2s ease-in-out infinite;
}

.qr-corner-br {
  bottom: -15px;
  right: -15px;
  animation: scanCornerBR 2s ease-in-out infinite;
}

@keyframes scanCornerTL {
  0%, 100% { transform: translate(0, 0); opacity: 1; }
  50% { transform: translate(-4px, -4px); opacity: 0.7; }
}

@keyframes scanCornerTR {
  0%, 100% { transform: translate(0, 0); opacity: 1; }
  50% { transform: translate(4px, -4px); opacity: 0.7; }
}

@keyframes scanCornerBL {
  0%, 100% { transform: translate(0, 0); opacity: 1; }
  50% { transform: translate(-4px, 4px); opacity: 0.7; }
}

@keyframes scanCornerBR {
  0%, 100% { transform: translate(0, 0); opacity: 1; }
  50% { transform: translate(4px, 4px); opacity: 0.7; }
}

.error-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--spacing-lg);
  color: var(--error);
}

/* ==========================================
   Responsive
   ========================================== */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  /* На планшетах форма снизу, описание сверху */
  .hero-content {
    order: 1;
  }
  
  .payment-card {
    order: 2;
  }
  
  .steps-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav {
    display: none;
  }
  
  /* На мобилках форма сверху, описание снизу */
  .hero .container {
    display: flex;
    flex-direction: column;
  }
  
  .hero-content {
    order: 2;
    padding-top: 0;
    text-align: center;
  }
  
  .hero-badge {
    justify-content: center;
  }
  
  .hero-features {
    align-items: center;
  }
  
  .payment-card {
    order: 1;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .footer {
    padding: var(--spacing-lg) 0 var(--spacing-md);
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
    margin-bottom: var(--spacing-md);
  }
  
  .footer-brand p {
    margin-top: 0.25rem;
    font-size: 0.8125rem;
  }
  
  .footer-links {
    gap: var(--spacing-md);
  }
  
  .footer-bottom {
    padding-top: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .hero-title {
    font-size: 2rem;
  }
}