/* Binance Style Landing Page CSS */
:root {
  /* Binance Color Palette */
  --binance-yellow: #FCD535;
  --binance-yellow-hover: #F0B90B;
  --binance-dark: #0B0E11;
  --binance-dark-secondary: #1E2329;
  --binance-gray: #474D57;
  --binance-light-gray: #848E9C;
  --binance-bg-light: #FAFAFA;
  --binance-white: #FFFFFF;
  --binance-border: #EAECEF;
  --binance-success: #0ECB81;
  --binance-error: #F6465D;
  --binance-bg-dark: #181A20;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Spacing */
  --container-max-width: 1200px;
  --section-padding: 80px 0;
  --element-radius: 8px;
  --element-radius-large: 16px;
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--binance-bg-dark);
  color: var(--binance-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Navigation */
.navbar {
  background: var(--binance-bg-dark);
  border-bottom: 1px solid var(--binance-dark-secondary);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 72px;
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  font-size: 24px;
  font-weight: 700;
}

.logo-text {
  color: var(--binance-white);
}

.logo-accent {
  color: var(--binance-yellow);
  margin-left: 2px;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-link {
  color: var(--binance-gray);
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  transition: color 0.2s ease;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--binance-white);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -20px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--binance-yellow);
}

.nav-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

/* Buttons */
.btn-primary {
  background: var(--binance-yellow);
  color: var(--binance-dark);
  border: none;
  padding: 12px 24px;
  border-radius: var(--element-radius);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(252, 213, 53, 0.3);
}

.btn-primary:hover {
  background: var(--binance-yellow-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--binance-white);
  border: 1px solid var(--binance-dark-secondary);
  padding: 12px 24px;
  border-radius: var(--element-radius);
  font-weight: 500;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  color: var(--binance-yellow);
  border-color: var(--binance-yellow);
}

.btn-outline {
  background: transparent;
  color: var(--binance-white);
  border: 2px solid var(--binance-white);
  padding: 16px 32px;
  border-radius: var(--element-radius);
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-outline:hover {
  background: var(--binance-white);
  color: var(--binance-dark);
}

.btn-large {
  padding: 16px 32px;
  font-size: 16px;
}

.btn-full {
  width: 100%;
}

/* Hero Section */
.hero {
  padding: 120px 0 80px;
  background: linear-gradient(135deg, var(--binance-bg-dark) 0%, var(--binance-dark-secondary) 100%);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 80px;
  align-items: center;
}

.hero-title {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  color: var(--binance-white);
}

.text-accent {
  color: var(--binance-yellow);
}

.hero-description {
  font-size: 18px;
  color: var(--binance-light-gray);
  margin-bottom: 32px;
  line-height: 1.6;
}

.hero-features {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 40px;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
}

.feature-icon {
  width: 20px;
  height: 20px;
  background: var(--binance-yellow);
  color: var(--binance-dark);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(252, 213, 53, 0.4);
}

.hero-actions {
  display: flex;
  gap: 16px;
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.stats-card {
  background: var(--binance-dark-secondary);
  border-radius: var(--element-radius-large);
  padding: 32px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(252, 213, 53, 0.2);
}

.stat-item {
  text-align: center;
  margin-bottom: 24px;
}

.stat-item:last-child {
  margin-bottom: 0;
}

.stat-value {
  font-size: 32px;
  font-weight: 800;
  color: var(--binance-yellow);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 14px;
  color: var(--binance-light-gray);
  font-weight: 500;
}

/* Section Styles */
.calculator-section,
.crypto-section,
.faq-section {
  padding: var(--section-padding);
  background: var(--binance-bg-dark);
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--binance-white);
  margin-bottom: 16px;
}

.section-description {
  font-size: 18px;
  color: var(--binance-light-gray);
  max-width: 600px;
  margin: 0 auto;
}

/* Calculator */
.calculator-card {
  background: var(--binance-dark-secondary);
  border-radius: var(--element-radius-large);
  padding: 48px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(252, 213, 53, 0.2);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  max-width: 900px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 24px;
}

.form-label {
  display: block;
  font-weight: 600;
  color: var(--binance-white);
  margin-bottom: 8px;
  font-size: 14px;
}

.form-input,
.form-select {
  width: 100%;
  padding: 16px;
  border: 2px solid var(--binance-dark-secondary);
  border-radius: var(--element-radius);
  font-size: 16px;
  transition: border-color 0.2s ease;
  background: var(--binance-bg-dark);
  color: var(--binance-white);
}

.currency-input-group {
  display: flex;
  gap: 8px;
  align-items: center;
}

.currency-input-group .form-input {
  flex: 2;
  height: 56px;
  box-sizing: border-box;
}

.currency-select {
  flex: 1;
  padding: 16px;
  border: 2px solid var(--binance-dark-secondary);
  background: var(--binance-dark);
  color: var(--binance-yellow);
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  height: 56px;
  box-sizing: border-box;
}

.currency-select option {
  background: var(--binance-dark);
  color: var(--binance-yellow);
  padding: 8px;
}

.currency-select:hover {
  background: var(--binance-dark);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--binance-yellow);
}

.form-range {
  width: 100%;
  height: 6px;
  background: var(--binance-white);
  border-radius: 3px;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--binance-yellow);
  border-radius: 50%;
  cursor: pointer;
}

.range-value {
  text-align: center;
  font-weight: 600;
  color: var(--binance-yellow);
  margin-top: 8px;
}

.calculator-results {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--binance-dark-secondary);
}

.result-item:last-of-type {
  border-bottom: none;
  margin-bottom: 24px;
}

.result-label {
  font-weight: 500;
  color: var(--binance-light-gray);
}

.result-value {
  font-weight: 700;
  color: var(--binance-white);
  font-size: 18px;
}

/* Crypto Grid */
.crypto-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  margin-top: 30px;
  justify-content: center;
}

.crypto-card {
  background: var(--binance-dark-secondary);
  border: 1px solid rgba(252, 213, 53, 0.2);
  border-radius: 8px;
  padding: 12px 16px;
  text-align: left;
  transition: all 0.3s ease;
  flex: 0 0 auto;
  min-width: 140px;
  max-width: 180px;
  height: 60px;
  display: flex;
  flex-direction: row;
  justify-content: flex-start;
  align-items: center;
  position: relative;
  overflow: hidden;
  gap: 10px;
}

.crypto-card:hover {
  border-color: var(--binance-yellow);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(240, 185, 11, 0.15);
  background: linear-gradient(135deg, var(--binance-dark-secondary) 0%, rgba(240, 185, 11, 0.05) 100%);
}

.crypto-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--binance-yellow) 50%, transparent 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.crypto-card:hover::before {
  opacity: 1;
}

.crypto-logo {
  width: 24px;
  height: 24px;
  margin: 0;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
}

.crypto-logo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.crypto-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  flex: 1;
}

.crypto-symbol {
  font-weight: 600;
  font-size: 13px;
  color: var(--binance-white);
  margin: 0 0 2px 0;
  white-space: nowrap;
  line-height: 1.2;
}

.crypto-name {
  font-size: 11px;
  color: var(--binance-light-gray);
  line-height: 1.2;
}

.crypto-price-info {
  margin-top: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: rgba(252, 213, 53, 0.1);
  border-radius: 6px;
  border: 1px solid rgba(252, 213, 53, 0.2);
}

.current-price {
  font-size: 14px;
  font-weight: 600;
  color: var(--binance-white);
}

.price-change {
  font-size: 12px;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: 4px;
}

.price-change.positive {
  color: var(--binance-success);
  background: rgba(14, 203, 129, 0.2);
}

.price-change.negative {
  color: var(--binance-error);
  background: rgba(246, 70, 93, 0.2);
}

/* Contact Form */
.contact-section {
  padding: 40px 0;
  background: var(--binance-bg-dark);
  position: relative;
}

.hero-contact-form {
  width: 100%;
  max-width: 400px;
}

.contact-content {
  max-width: 400px;
  margin: 0 auto;
  padding: 30px;
  background: rgba(24, 26, 32, 0.8);
  border: 1px solid var(--binance-dark-secondary);
  border-radius: 12px;
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.contact-content .section-title {
  font-size: 20px;
  margin-bottom: 20px;
  text-align: center;
}

.contact-form {
  margin-top: 0;
  text-align: left;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.form-group {
  margin-bottom: 12px;
}

.form-label {
  font-size: 12px;
  margin-bottom: 4px;
  color: var(--binance-light-gray);
}

.form-input,
.form-select {
  padding: 10px 12px;
  font-size: 14px;
  border-radius: 6px;
}

.form-textarea {
  width: 100%;
  padding: 10px 12px;
  border: 2px solid var(--binance-dark-secondary);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  background: var(--binance-bg-dark);
  color: var(--binance-white);
  resize: vertical;
  min-height: 60px;
}

.form-textarea:focus {
  outline: none;
  border-color: var(--binance-yellow);
}

.contact-form .btn-primary {
  width: 100%;
  padding: 12px;
  font-size: 14px;
  margin-top: 15px;
}

/* FAQ Contact Section */
.faq-contact-section {
  padding: 40px 0;
  background: var(--binance-bg-dark);
}

.faq-contact-content {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 40px;
  align-items: start;
}

/* Mobile App Showcase */
.mobile-app-showcase {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
}

.mobile-mockup {
  width: 280px;
  height: 560px;
  background: linear-gradient(145deg, #2c2c2c, #1a1a1a);
  border-radius: 30px;
  padding: 8px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  position: relative;
}

.mobile-screen {
  width: 100%;
  height: 100%;
  background: #181a20;
  border-radius: 22px;
  overflow: hidden;
  position: relative;
}

.mobile-header {
  padding: 12px 20px;
  background: #181a20;
}

.status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  color: var(--binance-white);
  margin-bottom: 10px;
}

.signal-battery {
  display: flex;
  gap: 5px;
  font-size: 12px;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--binance-white);
}

.back-btn {
  color: var(--binance-yellow);
  font-size: 16px;
}

.title {
  font-weight: 600;
  font-size: 18px;
}

.mobile-content {
  padding: 20px;
  color: var(--binance-white);
}

.mobile-content h3 {
  font-size: 14px;
  color: var(--binance-light-gray);
  margin-bottom: 8px;
}

.crypto-selector, .loan-selector {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  background: rgba(240, 185, 11, 0.1);
  border-radius: 8px;
  margin-bottom: 20px;
}

.crypto-icon {
  color: #f7931a;
  font-size: 20px;
  font-weight: bold;
}

.usdt-icon {
  color: #26a17b;
  font-size: 20px;
}

.crypto-name, .usdt-name {
  font-weight: 600;
}

.crypto-amount, .loan-amount {
  margin-left: auto;
  font-weight: 600;
}

.ltv-buttons {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.ltv-btn {
  padding: 8px 16px;
  border: 1px solid var(--binance-dark-secondary);
  background: transparent;
  color: var(--binance-white);
  border-radius: 6px;
  cursor: pointer;
}

.ltv-btn.active {
  background: var(--binance-yellow);
  color: var(--binance-dark);
  border-color: var(--binance-yellow);
}

.fee-amount {
  font-size: 24px;
  font-weight: bold;
  margin-bottom: 8px;
}

.fee-description {
  font-size: 12px;
  color: var(--binance-light-gray);
  line-height: 1.4;
  margin-bottom: 20px;
}

.total-amount {
  font-size: 20px;
  font-weight: bold;
  margin-bottom: 8px;
}

.repay-info, .terms {
  font-size: 11px;
  color: var(--binance-light-gray);
  line-height: 1.3;
  margin-bottom: 5px;
}

.faq-contact-right {
  display: flex;
  justify-content: flex-end;
}

@media (max-width: 768px) {
  .form-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  
  .contact-content {
    max-width: 350px;
    padding: 20px;
    margin: 0 20px;
  }
  
  .faq-contact-content {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .faq-contact-right {
    justify-content: center;
  }
  
  .mobile-mockup {
    width: 240px;
    height: 480px;
  }
  
  .mobile-app-showcase {
    margin-bottom: 20px;
  }
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--binance-dark-secondary);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  cursor: pointer;
  font-weight: 600;
  color: var(--binance-white);
}

.faq-toggle {
  font-size: 24px;
  color: var(--binance-yellow);
  font-weight: 300;
  transition: transform 0.2s ease;
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
}

.faq-answer {
  padding-bottom: 24px;
  color: var(--binance-light-gray);
  line-height: 1.6;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* Footer */
.footer {
  background: var(--binance-dark);
  color: var(--binance-white);
  padding: 64px 0 32px;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
  margin-bottom: 48px;
}

.footer-brand .logo-text,
.footer-brand .logo-accent {
  color: var(--binance-white);
}

.footer-brand .logo-accent {
  color: var(--binance-yellow);
}

.footer-description {
  color: var(--binance-light-gray);
  margin-top: 16px;
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

.footer-column h4 {
  color: var(--binance-white);
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-column a {
  display: block;
  color: var(--binance-light-gray);
  text-decoration: none;
  margin-bottom: 12px;
  transition: color 0.2s ease;
}

.footer-column a:hover {
  color: var(--binance-yellow);
}

.footer-bottom {
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid var(--binance-dark-secondary);
  color: var(--binance-light-gray);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero-content {
    grid-template-columns: 1fr;
    gap: 48px;
    text-align: center;
  }
  
  .hero-title {
    font-size: 36px;
  }
  
  .calculator-card {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 32px;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .btn-large {
    width: 100%;
    max-width: 300px;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .hero {
    padding: 100px 0 60px;
  }
  
  .hero-title {
    font-size: 28px;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .calculator-card {
    padding: 24px;
  }
}