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

:root {
  --primary-color: #4f46e5;
  --primary-hover: #4338ca;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --text-dark: #1f2937;
  --text-light: #6b7280;
  --border-color: #e5e7eb;
  --bg-light: #f9fafb;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

html, body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  color: var(--text-dark);
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* Header */
.header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
  color: white;
  padding: 2rem 1rem;
  text-align: center;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.subtitle {
  font-size: 1.1rem;
  opacity: 0.95;
  margin-bottom: 1rem;
}

.githubLink {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  color: white;
  padding: 0.6rem 1.2rem;
  border-radius: 50px;
  text-decoration: none;
  transition: all 0.3s ease;
  font-weight: 500;
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.githubLink:hover {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.6);
  transform: translateY(-2px);
}

/* Container & Layout */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
}

.mainSection {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
}

/* Email Inputs Section */
.emailInputsSection {
  margin-bottom: 2rem;
}

.emailInputsSection h2 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.emailInputs {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.emailInput {
  flex: 1;
  min-width: 250px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.emailInput label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-dark);
}

.emailInput input {
  padding: 0.75rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 0.95rem;
  transition: all 0.3s ease;
  background: var(--bg-light);
}

.emailInput input:focus {
  outline: none;
  border-color: var(--primary-color);
  background: white;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Interim Display */
#interimDisplay {
  min-height: 2rem;
  padding: 1rem;
  margin-bottom: 1.5rem;
  background: #fef3c7;
  border-left: 4px solid var(--warning-color);
  border-radius: 6px;
  color: #78350f;
  font-style: italic;
  font-size: 0.95rem;
  opacity: 0;
  transition: opacity 0.3s ease;
}

#interimDisplay.active {
  opacity: 1;
}

/* Editor Section */
.editorSection {
  margin-bottom: 2rem;
}

.editorHeader {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.editorHeader h2 {
  font-size: 1.3rem;
  color: var(--text-dark);
}

.editorActions {
  display: flex;
  gap: 0.5rem;
}

.copyBtn, .undoBtn, .redoBtn {
  padding: 0.6rem 1rem;
  background: var(--bg-light);
  border: 2px solid var(--border-color);
  border-radius: 6px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.3s ease;
  font-size: 0.9rem;
}

.copyBtn:hover, .undoBtn:hover, .redoBtn:hover {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.copyBtn:disabled, .undoBtn:disabled, .redoBtn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Main Text Area */
.main {
  border: 2px solid var(--border-color);
  padding: 1.5rem;
  margin-bottom: 0.5rem;
  border-radius: 8px;
  min-height: 150px;
  background: white;
  line-height: 1.8;
  word-wrap: break-word;
  word-break: break-word;
  transition: border-color 0.3s ease;
}

.main:focus-within {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Character & Word Count */
.charCount {
  text-align: right;
  font-size: 0.85rem;
  color: var(--text-light);
  padding: 0 0.5rem;
}

.separator {
  margin: 0 0.5rem;
}

/* Status Indicator */
.statusIndicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding: 0.75rem 1rem;
  background: var(--bg-light);
  border-radius: 8px;
  font-weight: 500;
}

.statusDot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #d1d5db;
  animation: none;
}

.statusDot.listening {
  background: var(--warning-color);
  animation: pulse 1.5s ease-in-out infinite;
}

.statusDot.recording {
  background: var(--danger-color);
  animation: pulse 1.5s ease-in-out infinite;
}

.statusDot.ready {
  background: var(--success-color);
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* Controls Section */
.controlsSection {
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mainControls, .sendControls {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

button {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.start {
  background: var(--success-color);
  color: white;
  flex: 1;
  min-width: 150px;
}

.start:hover:not(:disabled) {
  background: #059669;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.stop {
  background: var(--danger-color);
  color: white;
  flex: 1;
  min-width: 150px;
}

.stop:hover:not(:disabled) {
  background: #dc2626;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.clear {
  background: #f97316;
  color: white;
  flex: 1;
  min-width: 150px;
}

.clear:hover {
  background: #ea580c;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.sendEmailBtn, .sendGmailBtn {
  background: var(--primary-color);
  color: white;
  flex: 1;
  min-width: 150px;
}

.sendEmailBtn:hover, .sendGmailBtn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.disable {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* Quick Reference Panel */
.quickReference {
  background: var(--bg-light);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 2rem;
  border: 1px solid var(--border-color);
}

.quickRefHeader {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: var(--primary-color);
  color: white;
  cursor: pointer;
  user-select: none;
}

.quickRefHeader h3 {
  margin: 0;
  font-size: 1.1rem;
}

.toggleQuickRef {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: none;
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: 50%;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.toggleQuickRef:hover {
  background: rgba(255, 255, 255, 0.3);
}

.quickRefContent {
  padding: 1rem;
  max-height: 500px;
  overflow-y: auto;
  transition: all 0.3s ease;
}

.quickRefContent.collapsed {
  max-height: 0;
  padding: 0;
  overflow: hidden;
}

.commandGroup {
  margin-bottom: 1.5rem;
}

.commandGroup:last-child {
  margin-bottom: 0;
}

.commandGroup h4 {
  margin-bottom: 0.75rem;
  color: var(--primary-color);
  font-size: 0.95rem;
  font-weight: 700;
}

.commands {
  display: grid;
  gap: 0.5rem;
}

.command {
  background: white;
  padding: 0.6rem;
  border-radius: 6px;
  border-left: 3px solid var(--primary-color);
  font-size: 0.85rem;
}

.cmd {
  background: #e0e7ff;
  color: var(--primary-color);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  font-weight: 600;
  font-family: 'Monaco', 'Courier', monospace;
}

/* Additional Controls */
.additionalControls {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.instructionBtn, .previewBtn {
  background: var(--primary-color);
  color: white;
  flex: 1;
  min-width: 150px;
}

.instructionBtn:hover, .previewBtn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

/* Modals */
.instructionContainer, .previewContainer {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 1000;
  padding: 1rem;
  overflow-y: auto;
}

.instructionContainer.show, .previewContainer.show {
  opacity: 1;
  visibility: visible;
}

.instructionContainer.hide, .previewContainer.hide {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.instructionContent, .previewContent {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  max-width: 700px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

.instructionClose, .previewClose {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--bg-light);
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.instructionClose:hover, .previewClose:hover {
  background: var(--danger-color);
  color: white;
}

.instructionContent h2, .previewContent h2 {
  margin-bottom: 1.5rem;
  color: var(--text-dark);
}

.instructionBody {
  font-size: 0.95rem;
  line-height: 1.8;
}

.instructionBody h3 {
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--primary-color);
}

.instructionBody ol, .instructionBody ul {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

.instructionBody li {
  margin-bottom: 0.5rem;
}

.instructionBody mark {
  background: #fef3c7;
  color: #78350f;
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-weight: 600;
}

/* Preview Modal */
.previewBody {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.previewField {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.previewField label {
  font-weight: 600;
  color: var(--text-dark);
}

.previewField input[type="email"] {
  padding: 0.75rem;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.95rem;
  transition: all 0.3s ease;
}

.previewField input[type="email"]:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.previewText {
  background: var(--bg-light);
  padding: 1rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  min-height: 3rem;
  word-wrap: break-word;
  word-break: break-word;
  white-space: pre-wrap;
  line-height: 1.6;
}

.previewActions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.previewConfirm, .previewCancel {
  flex: 1;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.previewConfirm {
  background: var(--success-color);
  color: white;
}

.previewConfirm:hover {
  background: #059669;
}

.previewCancel {
  background: var(--text-light);
  color: white;
}

.previewCancel:hover {
  background: #4b5563;
}

/* Browser Compatibility Warning */
.notSupport {
  background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
  border: 2px solid var(--danger-color);
  border-radius: 12px;
  padding: 2rem 1rem;
  text-align: center;
  margin-bottom: 2rem;
  display: none;
}

.notSupport.show {
  display: block;
}

.notSupport.hide {
  display: none;
}

.notSupport p {
  margin: 0.5rem 0;
  font-weight: 500;
  color: #7f1d1d;
}

.notSupport p:first-child {
  font-size: 1.2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .header {
    padding: 1.5rem 1rem;
  }

  .title {
    font-size: 1.8rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .mainSection {
    padding: 1.5rem;
  }

  .emailInputs {
    flex-direction: column;
  }

  .emailInput {
    min-width: 100%;
  }

  .editorHeader {
    flex-direction: column;
    align-items: flex-start;
  }

  .mainControls, .sendControls {
    flex-direction: column;
  }

  .start, .stop, .clear, .sendEmailBtn, .sendGmailBtn, .instructionBtn, .previewBtn {
    width: 100%;
  }

  .instructionContent, .previewContent {
    padding: 1.5rem;
  }

  .quickRefContent {
    max-height: 300px;
  }
}

@media (max-width: 480px) {
  .header {
    padding: 1rem;
    margin-bottom: 1rem;
  }

  .title {
    font-size: 1.5rem;
  }

  .subtitle {
    font-size: 0.9rem;
  }

  .mainSection {
    padding: 1rem;
    border-radius: 8px;
  }

  .main {
    min-height: 100px;
    padding: 1rem;
  }

  .editorActions {
    flex-direction: column;
    width: 100%;
  }

  .copyBtn, .undoBtn, .redoBtn {
    width: 100%;
  }

  button {
    font-size: 0.9rem;
    padding: 0.6rem 1rem;
  }

  .charCount {
    font-size: 0.8rem;
  }

  .commandGroup {
    margin-bottom: 1rem;
  }

  .command {
    font-size: 0.8rem;
    padding: 0.5rem;
  }
}