/* Color Palette Variables */
:root {
  --bg-color: #FDFBF7;
  --text-color: #121212;
  --card-bg: #FFFFFF;
  --primary-color: #25D366;
  --primary-hover: #1ebd59;
  --btn-text-primary: #000000;
  
  --secondary-color: #FFDE4D;
  --secondary-hover: #f0cf37;
  --btn-text-secondary: #000000;
  
  --error-bg: #FF5C5C;
  --error-text: #000000;
  --border-color: #000000;
  --shadow-color: #000000;
  
  --input-inset-shadow: inset 2px 2px 0px rgba(0, 0, 0, 0.15);
  --error-badge-bg: #000000;
  --error-badge-text: #FFFFFF;
  
  --border-width: 4px;
  --border-radius: 16px;
  --font-family: 'Outfit', sans-serif;
  
  --shadow-offset: 8px;
  --shadow-offset-active: 4px;
  --btn-translate: 4px;
}

/* System Dark Mode Fallback (if no theme set manually) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-color: #121212;
    --text-color: #FDFBF7;
    --card-bg: #1E1E1E;
    
    --primary-color: #25D366;
    --primary-hover: #2ee673;
    --btn-text-primary: #000000;
    
    --secondary-color: #333333;
    --secondary-hover: #444444;
    --btn-text-secondary: #FDFBF7;
    
    --error-bg: #E84545;
    --error-text: #FFFFFF;
    --border-color: #FDFBF7;
    --shadow-color: #FDFBF7;
    
    --input-inset-shadow: inset 2px 2px 0px rgba(255, 255, 255, 0.05);
    --error-badge-bg: var(--border-color);
    --error-badge-text: var(--bg-color);
  }
}

/* Explicit Dark Theme */
:root[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #FDFBF7;
  --card-bg: #1E1E1E;
  
  --primary-color: #25D366;
  --primary-hover: #2ee673;
  --btn-text-primary: #000000;
  
  --secondary-color: #333333;
  --secondary-hover: #444444;
  --btn-text-secondary: #FDFBF7;
  
  --error-bg: #E84545;
  --error-text: #FFFFFF;
  --border-color: #FDFBF7;
  --shadow-color: #FDFBF7;
  
  --input-inset-shadow: inset 2px 2px 0px rgba(255, 255, 255, 0.05);
  --error-badge-bg: var(--border-color);
  --error-badge-text: var(--bg-color);
}

/* Explicit Light Theme */
:root[data-theme="light"] {
  --bg-color: #FDFBF7;
  --text-color: #121212;
  --card-bg: #FFFFFF;
  
  --primary-color: #25D366;
  --primary-hover: #1ebd59;
  --btn-text-primary: #000000;
  
  --secondary-color: #FFDE4D;
  --secondary-hover: #f0cf37;
  --btn-text-secondary: #000000;
  
  --error-bg: #FF5C5C;
  --error-text: #000000;
  --border-color: #000000;
  --shadow-color: #000000;
  
  --input-inset-shadow: inset 2px 2px 0px rgba(0, 0, 0, 0.15);
  --error-badge-bg: #000000;
  --error-badge-text: #FFFFFF;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-family);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 16px;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

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

/* App Container and Card */
.app-container {
  width: 100%;
  max-width: 420px;
  min-height: calc(100vh - 48px);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.brutalist-card {
  background-color: var(--card-bg);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-offset) var(--shadow-offset) 0px var(--shadow-color);
  padding: 32px 24px;
  transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275), border-color 0.3s ease, background-color 0.3s ease;
  animation: cardEntrance 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes cardEntrance {
  from {
    opacity: 0;
    transform: translateY(30px) rotate(-1deg);
  }
  to {
    opacity: 1;
    transform: translateY(0) rotate(0deg);
  }
}

/* Header Design */
.app-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: 28px;
}

.logo-container {
  width: 80px;
  height: 80px;
  margin-bottom: 16px;
  position: relative;
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.logo-container:hover {
  transform: scale(1.1) rotate(5deg);
}

.logo-svg {
  width: 100%;
  height: 100%;
  display: block;
}

.app-title {
  font-size: 2.2rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.5px;
  margin-bottom: 6px;
  line-height: 1.1;
  color: var(--text-color);
}

.app-subtitle {
  font-size: 0.95rem;
  font-weight: 600;
  opacity: 0.8;
  line-height: 1.4;
}

/* Form Styles */
.wa-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Input Group Wrapper */
.input-wrapper {
  width: 100%;
}

.input-group {
  display: flex;
  gap: 12px;
  width: 100%;
}

input[type="tel"] {
  flex-grow: 1;
  min-width: 0;
  background-color: var(--card-bg);
  color: var(--text-color);
  font-family: var(--font-family);
  font-size: 1.3rem;
  font-weight: 800;
  padding: 16px 20px;
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  outline: none;
  transition: border-color 0.3s ease, background-color 0.3s ease;
  box-shadow: var(--input-inset-shadow);
}

input[type="tel"]:focus {
  border-color: var(--primary-color);
}

input[type="tel"]::placeholder {
  color: var(--text-color);
  opacity: 0.4;
  font-weight: 600;
}

/* Brutalist Buttons styling */
.brutalist-btn-primary, .brutalist-btn-secondary {
  font-family: var(--font-family);
  font-weight: 800;
  text-transform: uppercase;
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  cursor: pointer;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  position: relative;
  transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.3s ease, border-color 0.3s ease;
}

.brutalist-btn-primary {
  background-color: var(--primary-color);
  color: var(--btn-text-primary);
  font-size: 1.2rem;
  padding: 18px 24px;
  width: 100%;
  box-shadow: var(--shadow-offset-active) var(--shadow-offset-active) 0px var(--shadow-color);
}

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

.brutalist-btn-primary:active {
  transform: translate(var(--btn-translate), var(--btn-translate));
  box-shadow: 0px 0px 0px var(--shadow-color);
}


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

/* Error Card Component */
.error-card {
  background-color: var(--error-bg);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  animation: errorEntrance 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes errorEntrance {
  from {
    transform: scale(0.95) translateY(-5px);
    opacity: 0;
  }
  to {
    transform: scale(1) translateY(0);
    opacity: 1;
  }
}

.error-badge {
  background-color: var(--error-badge-bg);
  color: var(--error-badge-text);
  font-size: 0.75rem;
  font-weight: 900;
  padding: 2px 8px;
  border-radius: 4px;
  align-self: flex-start;
  text-transform: uppercase;
}

.error-message {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--error-text);
  line-height: 1.3;
}

.hidden {
  display: none !important;
}

/* App Footer Info */
.app-footer {
  text-align: center;
  font-size: 0.8rem;
  font-weight: 600;
  opacity: 0.6;
  line-height: 1.4;
  padding: 0 16px;
  margin-top: auto;
  padding-top: 24px;
}

/* Focus Styling for Accessibility */
input[type="tel"]:focus-visible,
button:focus-visible {
  outline: 3px solid var(--primary-color);
  outline-offset: 3px;
}

/* Theme Toggle Button Component (Neo Brutalism Style) */
.theme-toggle-container {
  display: flex;
  justify-content: flex-end;
  margin-top: auto;
  margin-bottom: -4px; /* Sits nicely above the main card */
  z-index: 10;
  animation: cardEntrance 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

.brutalist-btn-theme {
  background-color: var(--secondary-color);
  color: var(--btn-text-secondary);
  border: var(--border-width) solid var(--border-color);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 4px 4px 0px var(--shadow-color);
  transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.3s ease, border-color 0.3s ease;
  outline: none;
}

.brutalist-btn-theme:hover {
  background-color: var(--secondary-hover);
  transform: scale(1.05);
}

.brutalist-btn-theme:active {
  transform: translate(2px, 2px) scale(0.95);
  box-shadow: 2px 2px 0px var(--shadow-color);
}

.theme-icon {
  width: 22px;
  height: 22px;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Toggle icon display states based on active theme */
:root[data-theme="light"] .sun-icon {
  display: none;
}
:root[data-theme="light"] .moon-icon {
  display: block;
}

:root[data-theme="dark"] .sun-icon {
  display: block;
}
:root[data-theme="dark"] .moon-icon {
  display: none;
}

/* Default state based on media query when no data-theme attribute exists */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .sun-icon {
    display: block;
  }
  :root:not([data-theme="light"]) .moon-icon {
    display: none;
  }
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .sun-icon {
    display: none;
  }
  :root:not([data-theme="dark"]) .moon-icon {
    display: block;
  }
}