/* ============================================================================
   ThinkPay Website - Complete Stylesheet (Coinbase Style)
   ============================================================================ */

/* 1. CSS Variables (Coinbase Style - Professional Blue System) */
:root {
  /* Color System - Professional Blue (Coinbase Style) */
  --color-primary: #0052FF;
  --color-primary-dark: #003DB3;
  --color-primary-darker: #002580;
  --color-primary-light: #2E7FFF;
  --color-primary-lighter: #5DA3FF;
  --color-primary-lightest: #F0F6FF;

  --color-success: #4CAF50;
  --color-success-light: #C8E6C9;
  --color-success-lighter: #EBF7EE;

  --color-warning: #F57C00;
  --color-warning-light: #FFB74D;
  --color-warning-lighter: #FFF3E0;

  --color-error: #DC2626;
  --color-error-light: #EF9A9A;
  --color-error-lighter: #FFEBEE;

  /* Neutral Colors */
  --color-gray-50: #F9FAFB;
  --color-gray-100: #F3F4F6;
  --color-gray-200: #E5E7EB;
  --color-gray-300: #D1D5DB;
  --color-gray-400: #9CA3AF;
  --color-gray-500: #6B7280;
  --color-gray-600: #4B5563;
  --color-gray-700: #374151;
  --color-gray-800: #1F2937;
  --color-gray-900: #111827;

  /* Semantic Colors (Coinbase Style) */
  --color-bg: #FFFFFF;
  --color-bg-secondary: #F7FAFD;
  --color-text: #0F1419;
  --color-text-secondary: #5B6C7F;
  --color-border: #D5DCEB;
  --color-divider: #EDF0F7;

  /* Spacing System (8px Grid) */
  --spacing-xs: 4px;
  --spacing-s: 8px;
  --spacing-m: 16px;
  --spacing-l: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --spacing-4xl: 80px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0F1419;
    --color-bg-secondary: #1A202C;
    --color-text: #F5F7FB;
    --color-text-secondary: #A0AEC0;
    --color-border: #2D3748;
    --color-divider: #1E293B;
  }
}

/* ============================================================================
   2. Base Style Reset
   ============================================================================ */

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  transition: background-color var(--transition-base),
    color var(--transition-base);
}

ol,
ul {
  list-style: none;
}

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

a:hover {
  color: var(--color-primary-dark);
}

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

svg {
  display: block;
  width: 100%;
  height: 100%;
}

/* ============================================================================
   3. Typography
   ============================================================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-m);
}

h1 {
  font-size: 48px;
}

h2 {
  font-size: 36px;
}

h3 {
  font-size: 28px;
}

h4 {
  font-size: 24px;
  font-weight: 600;
}

h5 {
  font-size: 20px;
  font-weight: 600;
}

h6 {
  font-size: 16px;
  font-weight: 600;
}

p {
  font-size: 16px;
  line-height: 1.5;
  margin-bottom: var(--spacing-m);
}

small,
.caption {
  font-size: 12px;
  color: var(--color-text-secondary);
}

@media (max-width: 768px) {
  h1 {
    font-size: 32px;
  }

  h2 {
    font-size: 28px;
  }

  h3 {
    font-size: 24px;
  }

  p {
    font-size: 14px;
  }
}

/* ============================================================================
   4. Button Components
   ============================================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-s);
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  text-decoration: none;
  user-select: none;
  outline-offset: 2px;
}

.btn-sm {
  padding: 10px 16px;
  font-size: 14px;
  min-height: 36px;
}

.btn-md {
  padding: 12px 24px;
  font-size: 14px;
  min-height: 44px;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
  min-height: 48px;
}

.btn-block {
  width: 100%;
  display: flex;
}

/* Primary Button */
.btn-primary {
  background-color: var(--color-primary);
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  background-color: var(--color-primary-darker);
  transform: translateY(0);
}

/* Secondary Button */
.btn-secondary {
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-gray-200);
  border-color: var(--color-gray-400);
}

/* Ghost Button */
.btn-ghost {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-ghost:hover {
  background-color: var(--color-primary-lightest);
}

.btn:disabled {
  background-color: var(--color-gray-200);
  color: var(--color-gray-400);
  cursor: not-allowed;
  opacity: 0.6;
}

/* ============================================================================
   5. Navigation Bar
   ============================================================================ */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-divider);
  transition: all var(--transition-base);
}

.navbar__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  height: 60px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-m);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  cursor: pointer;
}

.navbar__logo {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
}

.navbar__title {
  color: var(--color-text);
}

.navbar__menu {
  display: flex;
  gap: var(--spacing-2xl);
}

.navbar__link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.navbar__link:hover,
.navbar__link.active {
  color: var(--color-primary);
}

.navbar__link.active::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary);
}

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

.navbar__social {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  font-size: 18px;
}

.navbar__social:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-lightest);
}

@media (max-width: 768px) {
  .navbar__container {
    padding: 0 var(--spacing-l);
  }

  .navbar__menu {
    display: none;
  }

  .navbar__social {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }

  .navbar__actions .btn {
    padding: 8px 12px;
    font-size: 12px;
  }
}

/* ============================================================================
   6. Hero Section
   ============================================================================ */

.hero {
  padding: var(--spacing-4xl) var(--spacing-xl);
  background: linear-gradient(135deg, #FFFFFF 0%, #F0F6FF 50%, #FFFFFF 100%);
}

.hero__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4xl);
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.hero__content {
  max-width: 700px;
}

.hero__eyebrow {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--spacing-m);
  letter-spacing: 0.5px;
}

.hero__title {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.2;
  color: #111827 !important;
  margin-bottom: var(--spacing-l);
}

.hero__subtitle {
  font-size: 18px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-m);
}

.hero__description {
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-2xl);
}

.hero__actions {
  display: flex;
  gap: var(--spacing-l);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-2xl);
}

.hero__stats {
  display: flex;
  gap: var(--spacing-2xl);
  padding: var(--spacing-l) 0;
  border-top: 1px solid var(--color-divider);
}

.hero__stat-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-s);
}

.hero__stat-number {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
}

.hero__stat-label {
  font-size: 12px;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero__card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
  min-width: 280px;
}

.hero__card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-m);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-l);
}

.hero__card-header i {
  font-size: 16px;
  color: var(--color-primary);
}

.hero__card-body {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-l);
}

.hero__card-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: var(--spacing-m) 0;
  border-bottom: 1px solid var(--color-divider);
}

.hero__card-item:last-of-type {
  border-bottom: none;
}

.hero__card-label {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.hero__card-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
}

.hero__card-footer {
  display: flex;
  gap: var(--spacing-m);
  padding-top: var(--spacing-m);
  border-top: 1px solid var(--color-divider);
}

.hero__card-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  background-color: var(--color-bg-secondary);
  color: var(--color-text-secondary);
}

.hero__card-badge.success {
  background-color: var(--color-success-lighter);
  color: var(--color-success);
}

@media (max-width: 1024px) {
  .hero__container {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .hero__title {
    font-size: 36px;
  }
}

@media (max-width: 768px) {
  .hero {
    padding: var(--spacing-3xl) var(--spacing-l);
  }

  .hero__title {
    font-size: 28px;
  }

  .hero__subtitle {
    font-size: 16px;
  }

  .hero__actions {
    flex-direction: column;
  }

  .hero__stats {
    flex-direction: column;
    gap: var(--spacing-l);
  }

  .hero__card {
    min-width: auto;
  }
}

/* ============================================================================
   7. Section Header
   ============================================================================ */

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: var(--spacing-m);
  color: var(--color-text);
}

.section-subtitle {
  font-size: 18px;
  color: var(--color-text-secondary);
}

/* ============================================================================
   8. Advantages Section
   ============================================================================ */

.advantages {
  padding: var(--spacing-4xl) var(--spacing-xl);
  background-color: var(--color-bg);
}

.advantages__container {
  max-width: 1200px;
  margin: 0 auto;
}

.advantages__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-2xl);
}

.advantage-card {
  padding: var(--spacing-2xl);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.advantage-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.advantage-card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--spacing-l);
  color: var(--color-primary);
  background: var(--color-primary-lightest);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.advantage-card__title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--spacing-m);
  color: var(--color-text);
}

.advantage-card__description {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-l);
}

.advantage-card__features {
  list-style: none;
  padding-top: var(--spacing-l);
  border-top: 1px solid var(--color-divider);
}

.advantage-card__features li {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding: var(--spacing-s) 0;
  padding-left: var(--spacing-l);
  position: relative;
}

.advantage-card__features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: bold;
}

/* ============================================================================
   9. Statistics Section
   ============================================================================ */

.statistics {
  padding: var(--spacing-4xl) var(--spacing-xl);
  background: var(--color-bg-secondary);
}

.statistics__container {
  max-width: 1200px;
  margin: 0 auto;
}

.statistics__title {
  text-align: center;
  font-size: 36px;
  font-weight: 700;
  margin-bottom: var(--spacing-3xl);
  color: var(--color-text);
}

.statistics__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-4xl);
}

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

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

.stat-card__value {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-s);
}

.stat-card__label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-s);
}

.stat-card__description {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.statistics__highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
}

.highlight-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
}

.highlight-item h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: var(--spacing-m);
  color: var(--color-text);
}

.highlight-bar {
  width: 100%;
  height: 8px;
  background: var(--color-divider);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: var(--spacing-m);
}

.highlight-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  border-radius: 4px;
  transition: width 1s ease-out;
}

.highlight-item p {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin: 0;
}

/* ============================================================================
   10. CTA Section
   ============================================================================ */

.cta {
  padding: var(--spacing-4xl) var(--spacing-xl);
  background: linear-gradient(135deg, #F0F6FF 0%, #FFFFFF 50%, #F0F6FF 100%);
  text-align: center;
}

.cta__container {
  max-width: 800px;
  margin: 0 auto;
}

.cta__title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: var(--spacing-m);
  color: var(--color-text);
}

.cta__subtitle {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-2xl);
}

.cta__actions {
  display: flex;
  gap: var(--spacing-l);
  justify-content: center;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .cta__title {
    font-size: 28px;
  }

  .cta__subtitle {
    font-size: 16px;
  }

  .cta__actions {
    flex-direction: column;
  }

  .cta__actions .btn {
    width: 100%;
  }
}

/* ============================================================================
   11. Footer
   ============================================================================ */

.footer {
  background-color: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: var(--spacing-3xl) var(--spacing-xl);
}

.footer__container {
  max-width: 1200px;
  margin: 0 auto;
}

.footer__content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer__section {
  display: flex;
  flex-direction: column;
}

.footer__title {
  font-size: 12px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: var(--spacing-l);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-s);
}

.footer__links a {
  font-size: 14px;
  color: var(--color-gray-400);
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: var(--color-primary);
}

.footer__socials {
  display: flex;
  gap: var(--spacing-m);
}

.footer__social {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-gray-400);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  font-size: 16px;
}

.footer__social:hover {
  background: var(--color-primary);
  color: #FFFFFF;
}

.footer__divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
  margin: var(--spacing-2xl) 0;
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-l);
  font-size: 12px;
  color: var(--color-gray-500);
}

.footer__legal {
  display: flex;
  gap: var(--spacing-l);
}

.footer__legal a {
  color: var(--color-gray-400);
  font-size: 12px;
}

.footer__legal a:hover {
  color: var(--color-primary);
}

@media (max-width: 768px) {
  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

  .footer__legal {
    justify-content: center;
  }
}

/* ============================================================================
   12. Back to Top Button
   ============================================================================ */

.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: #FFFFFF;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
  z-index: 99;
  font-size: 18px;
}

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-4px);
}

.back-to-top.show {
  display: flex;
}

@media (max-width: 768px) {
  .back-to-top {
    bottom: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
  }
}

/* ============================================================================
   13. Utility Classes
   ============================================================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

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

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ============================================================================
   14. Animations
   ============================================================================ */

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    transform: translateY(16px);
    opacity: 0;
  }

  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.fade-in {
  animation: fadeIn var(--transition-base) ease-in-out;
}

.slide-up {
  animation: slideUp var(--transition-slow) ease-in-out;
}

/* ============================================================================
   15. Responsive Design
   ============================================================================ */

@media (max-width: 1024px) {
  .container {
    padding: 0 var(--spacing-l);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-l);
  }
}

/* ============================================================================
   16. Print Styles
   ============================================================================ */

@media print {

  .navbar,
  .back-to-top,
  .footer {
    display: none;
  }

  body {
    background: #FFFFFF;
    color: #000000;
  }
}

/* ============================================================================
   17. Focus and Accessibility
   ============================================================================ */

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}