/* CSS Variables for theming */
:root {
  --bg-primary: #fafafa;
  --bg-secondary: #ffffff;
  --text-primary: #0a0a0a;
  --text-secondary: #6b6b6b;
  --border-color: #e5e5e5;
  --accent-color: #003366;
  --accent-hover: #002244;
  --success-color: #22c55e;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --radius: 8px;
  --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --text-primary: #f5f5f5;
  --text-secondary: #a0a0a0;
  --border-color: #2a2a2a;
  --accent-color: #4d94ff;
  --accent-hover: #66a3ff;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  transition: background var(--transition), color var(--transition);
}

/* 2NATO Container */
.nato-container {
  width: 100%;
  max-width: 560px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: background var(--transition);
}

/* Header */
.header {
  padding: 1.5rem 1.5rem 1rem;
  text-align: center;
  position: relative;
}

.logo {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent-color);
  margin-bottom: 0.25rem;
}

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

/* Settings Toggle Button */
.settings-toggle {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  border-radius: var(--radius);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  color: var(--text-primary);
}

.settings-toggle:hover {
  background: var(--bg-secondary);
  border-color: var(--accent-color);
}

.settings-toggle:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.settings-toggle svg {
  width: 20px;
  height: 20px;
}

/* Main */
.main {
  padding: 1.5rem;
}

/* Input Section */
.input-section {
  margin-bottom: 1.5rem;
}

.label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.char-count {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.textarea {
  width: 100%;
  min-height: 120px;
  padding: 0.75rem;
  font-family: 'SF Mono', 'Menlo', 'Monaco', 'Courier New', monospace;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
  color: var(--text-primary);
  resize: vertical;
  scrollbar-gutter: stable;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.textarea::placeholder {
  color: var(--text-secondary);
  opacity: 0.6;
}

.textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(0, 51, 102, 0.15);
}

/* Output Section */
.output-section {
  margin-bottom: 1.5rem;
}

.output {
  display: block;
  min-height: 80px;
  padding: 0.75rem;
  font-family: 'SF Mono', 'Menlo', 'Monaco', 'Courier New', monospace;
  font-size: 1rem;
  line-height: 1.6;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-word;
  transition: border-color var(--transition);
}

.output:empty::before {
  content: "Your phonetic translation will appear here...";
  color: var(--text-secondary);
  opacity: 0.5;
}

/* Highlight first letter of NATO words */
.output .highlight {
  font-weight: 700;
  color: var(--accent-color);
}

/* Punctuation styling */
.output .punctuation {
  color: var(--text-secondary);
}

/* Actions */
.actions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}

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

.btn-primary {
  background: var(--accent-color);
  color: white;
}

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

.btn-secondary, .btn-tertiary {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover, .btn-tertiary:hover {
  background: var(--bg-secondary);
  border-color: var(--accent-color);
}

.btn svg {
  width: 16px;
  height: 16px;
}

/* Footer */
.footer {
  padding: 1rem 1.5rem;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
}

.shortcuts {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

kbd {
  display: inline-block;
  padding: 0.125rem 0.375rem;
  font-family: inherit;
  font-size: 0.7rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 0.75rem 1.5rem;
  background: var(--success-color);
  color: white;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Settings Panel */
.settings-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  z-index: 100;
}

.settings-overlay.open {
  opacity: 1;
  visibility: visible;
}

.settings-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 100%;
  max-width: 400px;
  height: 100vh;
  background: var(--bg-secondary);
  box-shadow: -4px 0 16px rgba(0, 0, 0, 0.15);
  transform: translateX(100%);
  transition: transform 0.3s ease;
  z-index: 101;
  display: flex;
  flex-direction: column;
}

.settings-panel.open {
  transform: translateX(0);
}

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.settings-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
}

.settings-close {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  border-radius: var(--radius);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  color: var(--text-primary);
}

.settings-close:hover {
  background: var(--bg-secondary);
  border-color: var(--accent-color);
}

.settings-content {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
}

.settings-section {
  margin-bottom: 2rem;
}

.settings-section:last-child {
  margin-bottom: 0;
}

.settings-section h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.settings-section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.settings-section-header h3 {
  margin-bottom: 0;
}

.btn-text {
  background: none;
  border: none;
  color: var(--accent-color);
  font-size: 0.875rem;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: background var(--transition);
}

.btn-text:hover {
  background: var(--bg-primary);
}

.select-input {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color var(--transition);
}

.select-input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(0, 51, 102, 0.15);
}

.settings-hint {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
  margin-bottom: 0;
}

/* History List */
.history-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 300px;
  overflow-y: auto;
}

.history-empty {
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-align: center;
  padding: 2rem 0;
}

.history-item {
  padding: 0.75rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}

.history-item:hover {
  border-color: var(--accent-color);
  background: var(--bg-secondary);
}

.history-input {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.history-output {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-family: 'SF Mono', 'Menlo', 'Monaco', 'Courier New', monospace;
}

/* Responsive */
@media (max-width: 480px) {
  body {
    padding: 0;
  }

  .nato-container {
    border-radius: 0;
    min-height: 100vh;
  }

  .header {
    padding: 1rem;
  }

  .logo {
    font-size: 2rem;
  }

  .main {
    padding: 1rem;
  }

  .actions {
    grid-template-columns: 1fr;
  }

  .btn {
    width: 100%;
  }

  .settings-panel {
    max-width: 100%;
  }
}