:root {
  /* Simple, clean color palette */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --border-color: #e5e7eb;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.1);
  
  /* Messenger colors */
  --whatsapp: #25D366;
  --telegram: #0088cc;
  
  /* Accent colors */
  --primary: #3b82f6;
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;
}

[data-theme="dark"] {
  /* Dark theme colors */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: #475569;
  --border-light: #64748b;
  --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-strong: 0 10px 15px rgba(0, 0, 0, 0.4);
}

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-secondary);
  min-height: 100vh;
  margin: 0;
  padding: 0;
}

.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  max-width: 100%;
}

/* Header */
.header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow);
}

.header-content {
  padding: 1.5rem;
  max-width: 480px;
  margin: 0 auto;
  position: relative;
}

.app-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.app-icon {
  font-size: 1.75rem;
}

.app-subtitle {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin: 0;
}

.theme-toggle {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.theme-toggle:hover {
  background: var(--border-color);
}

.theme-icon {
  font-size: 1.125rem;
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 1.5rem;
  max-width: 480px;
  margin: 0 auto;
  width: 100%;
}

/* Clipboard Section */
.clipboard-section {
  margin-bottom: 2rem;
}

.clipboard-status {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
}

.clipboard-status.detecting {
  border-color: var(--primary);
  background-color: #eff6ff;
}

.clipboard-status.success {
  border-color: var(--success);
  background-color: #f0fdf4;
}

.clipboard-status.error {
  border-color: var(--error);
  background-color: #fef2f2;
}

.status-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.status-content {
  flex: 1;
}

.status-title {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.status-subtitle {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Clipboard Actions */
.clipboard-actions {
  margin-bottom: 1.5rem;
  text-align: center;
}

.clipboard-check-btn {
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.clipboard-check-btn:hover {
  background: #2563eb;
}

.btn-icon {
  font-size: 1.125rem;
}

.btn-text {
  font-weight: 600;
}

/* Input Group */
.manual-input-container {
  margin-bottom: 1.5rem;
}

.input-group {
  position: relative;
  display: flex;
  align-items: center;
}

.phone-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-card);
  color: var(--text-primary);
  transition: border-color 0.2s ease;
}

.phone-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.phone-input::placeholder {
  color: var(--text-muted);
}

.clear-btn {
  position: absolute;
  right: 0.5rem;
  background: var(--text-muted);
  color: white;
  border: none;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.75rem;
  transition: background-color 0.2s ease;
}

.clear-btn:hover {
  background: var(--text-secondary);
}

/* Detected Number */
.detected-number-section {
  margin-bottom: 2rem;
}

.detected-number {
  background: var(--bg-card);
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  text-align: center;
  box-shadow: var(--shadow);
}

.number-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-right: 0.5rem;
}

.number-value {
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1.125rem;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

/* Messenger Section */
.messenger-section {
  margin-bottom: 2rem;
}

.messenger-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
  text-align: center;
}

.messenger-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.messenger-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
  width: 100%;
  text-align: left;
  box-shadow: var(--shadow);
}

.messenger-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.messenger-btn.whatsapp {
  border-color: var(--whatsapp);
}

.messenger-btn.whatsapp:hover {
  border-color: var(--whatsapp);
  background-color: #f0fdf4;
}

.messenger-btn.telegram {
  border-color: var(--telegram);
}

.messenger-btn.telegram:hover {
  border-color: var(--telegram);
  background-color: #eff6ff;
}


.messenger-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.messenger-icon svg {
  width: 24px;
  height: 24px;
}

.messenger-btn.whatsapp .messenger-icon {
  color: var(--whatsapp);
}

.messenger-btn.telegram .messenger-icon {
  color: var(--telegram);
}

.messenger-details {
  flex: 1;
  text-align: left;
}

.messenger-name {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.messenger-hint {
  color: var(--text-secondary);
  font-size: 0.75rem;
  margin-bottom: 0.25rem;
}

.messenger-number {
  color: var(--text-primary);
  font-size: 0.75rem;
  font-weight: 500;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  background: var(--bg-secondary);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  display: inline-block;
}

/* Permission and Error Sections */
.permissions-section, .error-section {
  margin-bottom: 2rem;
}

.permissions-card, .error-card {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  text-align: center;
  box-shadow: var(--shadow-light);
}

.permissions-icon, .error-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.permissions-card h3, .error-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.permissions-card p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.permissions-btn, .error-retry {
  background: var(--info);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 48px;
  touch-action: manipulation;
}

.permissions-btn:hover, .error-retry:hover {
  background: color-mix(in srgb, var(--info) 90%, black);
  transform: translateY(-1px);
  box-shadow: var(--shadow-medium);
}

.permissions-btn:active, .error-retry:active {
  transform: translateY(0);
}

.error-message {
  color: var(--error);
  margin-bottom: 1.5rem;
  font-weight: 500;
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 1.5rem;
  text-align: center;
  margin-top: auto;
}

.privacy-notice {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.privacy-icon {
  color: var(--success);
}

.app-info {
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* Toast Notifications */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-primary);
  color: var(--bg-primary);
  padding: 1rem 1.5rem;
  border-radius: 12px;
  box-shadow: var(--shadow-strong);
  z-index: 1000;
  max-width: calc(100vw - 2rem);
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(100%);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

.toast-content {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.toast-icon {
  font-size: 1.25rem;
}

.toast-message {
  font-weight: 500;
}

/* Responsive Design */
@media (max-width: 480px) {
  .messenger-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .messenger-btn {
    min-height: 80px;
  }
}

@media (min-width: 480px) {
  .main-content {
    padding: 2rem;
  }
  
  .messenger-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
  }
  
  .app-title {
    font-size: 1.75rem;
  }
}

@media (min-width: 768px) {
  .header-content {
    padding: 1.5rem 2rem;
  }
  
  .main-content {
    padding: 2.5rem;
  }
}

/* Touch improvements for mobile */
@media (hover: none) and (pointer: coarse) {
  .messenger-btn:hover {
    transform: none;
    box-shadow: var(--shadow-light);
  }
  
  .theme-toggle:hover {
    transform: none;
    background: var(--bg-secondary);
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border-color: #000000;
    --text-secondary: #000000;
  }
  
  [data-theme="dark"] {
    --border-color: #ffffff;
    --text-secondary: #ffffff;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .status-icon {
    animation: none;
  }
}