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

/* ===================================================================
   THEME VARIABLES
   =================================================================== */
:root {
  color-scheme: light;
  
  /* Light Theme - Retro Game Palette */
  --bg-primary: #e8e8d0;
  --bg-secondary: #f5f5e8;
  --text-primary: #2a2a2a;
  --text-secondary: #5a5a4a;
  --border-color: #2a2a2a;
  --border-width: 3px;
  --accent-primary: #2a2a2a;
  --accent-secondary: #5a5a4a;
  --button-primary-bg: #2a2a2a;
  --button-primary-text: #e8e8d0;
  --button-secondary-bg: #8a8a00;
  --button-secondary-text: #f5f5e8;
  --balance-bg: #ffaa00;
  --balance-border: #2a2a2a;
  --highlight-color: #ff5555;
  
  --shadow-sm: none;
  --shadow-md: none;
  --shadow-lg: 4px 4px 0px rgba(0, 0, 0, 0.3);
  --border-radius: 0px;
  --transition: all 0.1s linear;
}

html[data-theme="dark"] {
  color-scheme: dark;
  
  /* Dark Theme - Arcade Palette */
  --bg-primary: #0a0a0f;
  --bg-secondary: #1a1a2a;
  --text-primary: #ffff00;
  --text-secondary: #ffaa00;
  --border-color: #ffff00;
  --border-width: 2px;
  --accent-primary: #ffff00;
  --accent-secondary: #ffaa00;
  --button-primary-bg: #ffff00;
  --button-primary-text: #0a0a0f;
  --button-secondary-bg: #ff5555;
  --button-secondary-text: #1a1a2a;
  --balance-bg: #00aa00;
  --balance-border: #ffff00;
  --highlight-color: #ff00ff;
  
  --shadow-sm: none;
  --shadow-md: none;
  --shadow-lg: 3px 3px 0px rgba(255, 255, 0, 0.3);
  --border-radius: 0px;
  --transition: all 0.1s linear;
}

/* ===================================================================
   GLOBAL STYLES
   =================================================================== */
body {
  font-family: 'Press Start 2P', 'VT323', monospace;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 2;
  min-height: 100vh;
  padding: 20px;
  transition: var(--transition);
  font-size: 10px;
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
}

/* ===================================================================
   MAIN CONTAINER
   =================================================================== */
main {
  max-width: 600px;
  margin: 60px auto;
  background: var(--bg-secondary);
  border: var(--border-width) solid var(--border-color);
  box-shadow: var(--shadow-lg);
  padding: 32px;
  animation: slideUp 0.3s linear;
  position: relative;
}

/* ===================================================================
   HEADER SECTION
   =================================================================== */
.header {
  text-align: center;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 3px solid var(--border-color);
}

.header h1 {
  font-size: 20px;
  color: var(--text-primary);
  margin-bottom: 12px;
  font-weight: 400;
  letter-spacing: 2px;
  text-shadow: 2px 2px 0px rgba(0, 0, 0, 0.3);
}

.header p {
  color: var(--text-secondary);
  font-size: 8px;
  font-weight: 400;
  letter-spacing: 1px;
}

.balance-display {
  margin-top: 16px;
  padding: 8px 12px;
  background: var(--balance-bg);
  border: 2px solid var(--balance-border);
  font-size: 10px;
  font-weight: 400;
  color: var(--text-primary);
  text-align: center;
  letter-spacing: 1px;
  box-shadow: inset 1px 1px 0px rgba(0, 0, 0, 0.1), 2px 2px 0px rgba(0, 0, 0, 0.2);
  min-height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s linear;
}

/* ===================================================================
   FORM STYLES
   =================================================================== */
label {
  display: block;
  margin-bottom: 8px;
  font-weight: 400;
  color: var(--text-primary);
  font-size: 8px;
  text-transform: uppercase;
  letter-spacing: 2px;
}

input[type="text"],
input[type="number"] {
  width: 100%;
  padding: 8px 12px;
  border: 3px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 10px;
  font-family: inherit;
  margin-bottom: 16px;
  transition: var(--transition);
  background: var(--bg-primary);
  color: var(--text-primary);
  box-shadow: inset 2px 2px 0px rgba(0, 0, 0, 0.1);
}

input[type="text"]:focus,
input[type="number"]:focus {
  outline: none;
  border-color: var(--highlight-color);
  background: var(--bg-primary);
  box-shadow: inset 2px 2px 0px rgba(0, 0, 0, 0.1), 0 0 0 2px var(--highlight-color);
}

#etherAmount {
  margin-bottom: 20px;
}

/* ===================================================================
   ANIMATIONS
   =================================================================== */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===================================================================
   BUTTON STYLES
   =================================================================== */
button {
  padding: 8px 16px;
  border: 3px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 10px;
  font-weight: 400;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  letter-spacing: 1px;
  text-transform: uppercase;
  box-shadow: 3px 3px 0px rgba(0, 0, 0, 0.2);
  position: relative;
}

#connectButton,
#getBalanceButton,
#withdrawButton {
  background: var(--button-primary-bg);
  color: var(--button-primary-text);
  width: 100%;
  margin-bottom: 12px;
  box-shadow: 3px 3px 0px rgba(0, 0, 0, 0.2);
}

#connectButton:hover,
#getBalanceButton:hover,
#withdrawButton:hover {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0px rgba(0, 0, 0, 0.2);
  background: var(--accent-secondary);
  color: var(--button-primary-text);
}

#connectButton:active,
#getBalanceButton:active,
#withdrawButton:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px rgba(0, 0, 0, 0.2);
}

#fundButton {
  background: var(--button-secondary-bg);
  color: var(--button-secondary-text);
  width: 100%;
  box-shadow: 3px 3px 0px rgba(0, 0, 0, 0.2);
}

#fundButton:hover {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0px rgba(0, 0, 0, 0.2);
  background: var(--accent-primary);
  color: var(--button-secondary-text);
}

#fundButton:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px rgba(0, 0, 0, 0.2);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ===================================================================
   RESPONSIVE DESIGN
   =================================================================== */
@media (max-width: 600px) {
  main {
    padding: 24px 20px;
    margin: 40px auto;
  }

  button {
    padding: 8px 12px;
    font-size: 9px;
  }

  input[type="text"],
  input[type="number"] {
    padding: 8px 10px;
    font-size: 10px;
  }

  label {
    font-size: 7px;
  }

  .header h1 {
    font-size: 16px;
  }
}

@media (max-width: 400px) {
  main {
    padding: 16px 12px;
    margin: 20px auto;
  }

  body {
    padding: 8px;
  }

  .theme-toggle {
    padding: 6px 10px;
    font-size: 7px;
  }
}

/* ===================================================================
   UTILITY CLASSES & THEME
   =================================================================== */
.button-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.wallet-section {
  margin-bottom: 24px;
}

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

.fund-form {
  margin-top: 32px;
  padding-top: 32px;
  border-top: 3px solid var(--border-color);
}

/* Theme Toggle */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--button-primary-bg);
  color: var(--button-primary-text);
  border: 3px solid var(--border-color);
  padding: 8px 12px;
  cursor: pointer;
  font-family: inherit;
  font-size: 8px;
  font-weight: 400;
  letter-spacing: 1px;
  text-transform: uppercase;
  transition: var(--transition);
  z-index: 1000;
  box-shadow: 3px 3px 0px rgba(0, 0, 0, 0.2);
}

.theme-toggle:hover {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0px rgba(0, 0, 0, 0.2);
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Focus visible for accessibility */
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}