/* =============================================
   CSS Custom Properties (Design Tokens)
   ============================================= */
:root {
  /* Colors */
  --color-background: #fafafa;
  --color-white: #ffffff;
  --color-black: #1a1a1b;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e5e5e5;
  --color-gray-300: #d4d4d4;
  --color-gray-400: #a3a3a3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-blue: #326afd;
  --color-yellow: #fee94f;
  --color-gradient-start: #fee94f;
  --color-gradient-end: #326afd;

  /* Typography */
  --font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1),
    0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-card: 0 8px 32px -4px rgba(50, 106, 253, 0.08);

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

/* =============================================
   CSS Reset & Base Styles
   ============================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--color-background);
  color: var(--color-black);
  line-height: 1.5;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* =============================================
   Dotted Background Pattern
   ============================================= */
.dot-pattern {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 0;
  background-image: radial-gradient(circle, #d1d5db 2px, transparent 2px);
  background-size: 48px 48px;
  background-position: 24px 24px;
}

/* =============================================
   Header & Navigation
   ============================================= */
.header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 100;
  padding: var(--spacing-md) var(--spacing-xl);
}

.nav {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: var(--spacing-md);
  max-width: 1400px;
  margin: 0 auto;
}

.nav-left {
  flex: 1;
}

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

/* =============================================
   Buttons
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.btn-network {
  background: var(--color-black);
  color: var(--color-white);
  border: none;
}

.btn-network:hover {
  background: #2a2a2b;
  transform: translateY(-1px);
}

.btn-wallet {
  background: var(--color-black);
  color: var(--color-white);
  border: none;
}

.btn-wallet:hover {
  background: #2a2a2b;
  transform: translateY(-1px);
}

/* Responsive button text */
.btn-text-mobile {
  display: none;
}

.btn-text-desktop {
  display: inline;
}

/* =============================================
   Main Content
   ============================================= */
.main {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--spacing-3xl) var(--spacing-xl);
}

/* =============================================
   Title Section
   ============================================= */
.title-section {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
}

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

.faucet-icon {
  width: 48px;
  height: 48px;
  color: var(--color-black);
}

.title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.title-dark {
  color: var(--color-black);
}

.title-gradient {
  background: linear-gradient(
    90deg,
    var(--color-gradient-start),
    var(--color-gradient-end)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.title-blue {
  color: var(--color-blue);
}

/* =============================================
   Claim Card
   ============================================= */
.claim-card {
  position: relative;
  width: 100%;
  max-width: 520px;
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  padding: 3px;
  margin-bottom: var(--spacing-2xl);
}

/* Gradient Border Effect */
.claim-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-2xl);
  padding: 2px;
  background: linear-gradient(
    135deg,
    var(--color-gradient-start),
    var(--color-gradient-end)
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.card-glow {
  position: absolute;
  top: -50%;
  left: -50%;
  right: -50%;
  bottom: -50%;
  background: radial-gradient(
    circle at center,
    rgba(254, 233, 79, 0.08) 0%,
    rgba(50, 106, 253, 0.04) 40%,
    transparent 70%
  );
  pointer-events: none;
  filter: blur(40px);
}

.card-content {
  position: relative;
  background: var(--color-white);
  border-radius: calc(var(--radius-2xl) - 2px);
  padding: var(--spacing-xl) var(--spacing-xl) var(--spacing-lg);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-black);
  margin-bottom: var(--spacing-lg);
}

/* =============================================
   Input Wrapper
   ============================================= */
.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: all var(--transition-base);
}

.input-wrapper:focus-within {
  border-color: var(--color-gray-200);
}

.input-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: var(--spacing-md);
}

.input-wallet-icon {
  width: 24px;
  height: 24px;
  color: var(--color-gray-400);
}

.wallet-input {
  flex: 1;
  border: none;
  outline: none;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-black);
  background: transparent;
}

.wallet-input:focus {
  outline: none;
  border: none;
  box-shadow: none;
}

.wallet-input::placeholder {
  color: var(--color-gray-400);
}

/* =============================================
   Info Text
   ============================================= */
.max-info {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.max-info .highlight {
  color: var(--color-blue);
  font-weight: 600;
}

/* =============================================
   Claim Button
   ============================================= */
.claim-btn {
  width: 100%;
  padding: var(--spacing-lg) var(--spacing-xl);
  background: var(--color-black);
  border: none;
  border-radius: var(--radius-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-white);
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  animation: pulseBlack 2s ease-in-out infinite;
  position: relative;
  overflow: hidden;
}

.claim-btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.4),
    transparent
  );
  animation: flare 4s ease-in-out infinite;
}

.claim-btn strong {
  font-weight: 700;
  color: var(--color-white);
}

.claim-btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
  background: #2a2a2b;
}

.claim-btn:active {
  transform: translateY(0) scale(0.98);
}

@keyframes pulseBlack {
  0%,
  100% {
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  }
  50% {
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
  }
}

@keyframes flare {
  0% {
    left: -100%;
  }
  30% {
    left: 150%;
  }
  100% {
    left: 150%;
  }
}

.claim-btn.active {
  background: linear-gradient(135deg, var(--color-blue) 0%, #4a7dfe 100%);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(50, 106, 253, 0.3);
}

.claim-btn.active strong {
  color: var(--color-white);
}

.claim-btn.active:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(50, 106, 253, 0.4);
}

/* =============================================
   Footer
   ============================================= */
.footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
}

.footer-text {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

.footer-logo {
  height: 20px;
  width: auto;
}

/* =============================================
   Animations
   ============================================= */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% center;
  }
  100% {
    background-position: 200% center;
  }
}

.title-section {
  animation: fadeInUp 0.6s ease-out;
}

.claim-card {
  animation: fadeInUp 0.6s ease-out 0.1s both;
}

.footer {
  animation: fadeInUp 0.6s ease-out 0.2s both;
}

/* =============================================
   Responsive Styles
   ============================================= */
@media (max-width: 640px) {
  .header {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .nav-right {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-xs);
  }

  .btn-icon {
    width: 16px;
    height: 16px;
  }

  .btn-text-mobile {
    display: inline;
  }

  .btn-text-desktop {
    display: none;
  }

  .main {
    padding: var(--spacing-2xl) var(--spacing-md);
    padding-top: 120px;
  }

  .title {
    font-size: var(--font-size-2xl);
  }

  .faucet-icon {
    width: 36px;
    height: 36px;
  }

  .claim-card {
    max-width: 100%;
  }

  .card-content {
    padding: var(--spacing-lg);
  }

  .card-title {
    font-size: var(--font-size-base);
  }
}

@media (max-width: 480px) {
  .nav-right {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .btn-text-desktop,
  .btn-network span {
    display: none;
  }

  .btn-text-mobile {
    display: inline;
  }

  .btn {
    padding: var(--spacing-sm);
  }

  .title-section {
    flex-direction: row;
    gap: var(--spacing-sm);
  }
}

/* =============================================
   Hover & Focus States
   ============================================= */
@media (hover: hover) {
  .claim-card:hover {
    transform: translateY(-2px);
    transition: transform var(--transition-base);
  }

  .claim-card:hover .card-glow {
    opacity: 1.2;
  }
}

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

button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--color-blue);
  outline-offset: 2px;
}