:root {
  --lime-light: #92c20e;
  --lime-dark: #b0eb10;
  --black: #000000;
  --white: #ffffff;
  --blue: #5f7fff;
  --red: #ff5f5f;
  --yellow: #ffc107;
  --grey-light: #dddddd;
  --grey-dark: #777777;

  --bg: var(--white);
  --fg: var(--black);
  --input-bg: #f9f9f9;
  --input-border: #ccc;
  --button-bg: var(--lime-light);
  --section-bg: #eeeeee;
  --error-color: #d32f2f;
  --success-color: #43a047;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

body.dark {
  --bg: var(--black);
  --fg: var(--white);
  --input-bg: #1e1e1e;
  --input-border: #444;
  --button-bg: var(--lime-dark);
  --section-bg: #111111;
  --error-color: #ef5350;
  --success-color: #66bb6a;
}

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

body {
  font-family: 'Lato', 'Open Sans', sans-serif;
  background-color: var(--section-bg);
  color: var(--fg);
  max-width: 900px;
  margin: 0.5rem auto;
  padding: 1rem;
  transition: background var(--transition-normal), color var(--transition-normal);
  min-height: 100vh;
}

/* Typography */
h1 {
  font-size: 1.8rem;
  text-align: center;
  margin-bottom: 1.5rem;
  color: var(--fg);
}

/* Form Elements */
.form-group {
  margin-bottom: 1.2rem;
}

label {
  display: block;
  margin-top: 1.2rem;
  margin-bottom: 0.5rem;
  font-weight: bold;
  font-size: 1rem;
}

label.required::after {
  content: " *";
  color: var(--error-color);
  font-weight: normal;
}

input, 
select, 
textarea, 
button {
  width: 100%;
  box-sizing: border-box;
  padding: 0.8rem;
  border-radius: 12px;
  border: 1px solid var(--input-border);
  background-color: var(--input-bg);
  color: var(--fg);
  font-size: 1rem;
  transition: background-color var(--transition-normal), 
              color var(--transition-normal), 
              border-color var(--transition-fast),
              box-shadow var(--transition-fast);
  display: block;
}

/* Focus states */
input:focus, 
select:focus, 
textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(95, 127, 255, 0.2);
}

select, button {
  appearance: none;
  -webkit-appearance: none; /* For Safari */
}

/* Custom select arrow */
select {
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.8rem center;
  background-size: 1rem;
  padding-right: 2.5rem;
}

body.dark select {
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
}

input[type="file"] {
  padding: 0.6rem;
}

/* File input styling */
input[type="file"]::file-selector-button {
  border: none;
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  background-color: var(--button-bg);
  color: var(--black);
  font-weight: bold;
  cursor: pointer;
  margin-right: 1rem;
  transition: background-color var(--transition-fast);
}

input[type="file"]:hover::file-selector-button {
  background-color: var(--lime-dark);
}

button {
  background-color: var(--button-bg);
  color: var(--black);
  font-weight: bold;
  border: none;
  cursor: pointer;
  font-size: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
}

button:hover {
  background-color: var(--lime-dark);
  box-shadow: var(--shadow-md);
}

button:active {
  transform: translateY(1px);
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  justify-content: space-between;
  max-width: 600px;
  margin: 0 auto 1rem auto;
  gap: 1rem;
}

.theme-toggle button {
  background: var(--section-bg);
  border: 1px solid var(--input-border);
  color: var(--fg);
  font-weight: bold;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 12px;
  flex: 1;
  font-size: 0.9rem;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.theme-toggle button:hover {
  background-color: var(--button-bg);
  color: var(--black);
}

/* Help Overlay */
.overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  overflow-y: auto;
  padding: 2rem 1rem;
}

.overlay-content {
  background-color: var(--bg);
  color: var(--fg);
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
  border-radius: 12px;
  position: relative;
  box-shadow: var(--shadow-md);
}

.close-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 1.5rem;
  background: transparent;
  border: none;
  color: var(--fg);
  cursor: pointer;
  width: auto;
  height: auto;
  padding: 0.25rem 0.5rem;
  transition: color var(--transition-fast);
}

.close-btn:hover {
  color: var(--button-bg);
}

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

.help-section h2 {
  border-bottom: 2px solid var(--input-border);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
  color: var(--fg);
}

.help-content {
  line-height: 1.6;
}

.help-content p, 
.help-content li {
  margin-bottom: 1rem;
}

.help-content ol {
  padding-left: 1.5rem;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--fg);
}

/* Character counter */
.char-count {
  font-size: 0.8rem;
  color: var(--grey-dark);
  text-align: right;
  margin-top: 0.25rem;
  transition: color var(--transition-fast);
}

.char-count.warning {
  color: var(--yellow);
}

.char-count.error {
  color: var(--error-color);
}

/* Bottom buttons */
.bottom-buttons {
  max-width: 600px;
  margin: 2rem auto 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#feedbackBtn {
  background: var(--button-bg);
  border: 1px solid var(--input-border);
  color: var(--black);
  font-weight: bold;
  cursor: pointer;
  width: 48%;
  height: 60px;
}

#feedbackBtn:hover {
  background-color: var(--lime-dark);
}

/* Container for the main form */
form {
  max-width: 600px;
  margin: 0 auto;
  background-color: var(--bg);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: var(--shadow-md);
}

/* Message styling */
#formMessage {
  font-size: 1rem;
  padding: 0.8rem;
  border-radius: 8px;
  max-width: 600px;
  margin: 0 auto 1rem auto;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

#formMessage.error-message {
  background-color: rgba(211, 47, 47, 0.1);
  color: var(--error-color);
}

#formMessage.success-message {
  background-color: rgba(67, 160, 71, 0.1);
  color: var(--success-color);
}

/* Loading state */
button.loading {
  position: relative;
  pointer-events: none;
  color: transparent !important;
}

button.loading::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1.5rem;
  height: 1.5rem;
  margin-top: -0.75rem;
  margin-left: -0.75rem;
  border: 2px solid var(--black);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* Timer styles */
.timer-wrapper {
  margin-top: 1rem;
  text-align: center;
}

#timerMessage {
  color: var(--error-color);
  font-size: 0.9rem;
  display: block;
}

#timerText {
  font-weight: bold;
}

/* Help text */
#tone-help {
  font-size: 0.9rem;
  margin-top: 0.3rem;
  color: var(--grey-dark);
  transition: color var(--transition-normal);
}

/* Results section */
#results {
  max-width: 800px;
  width: 100%;
  margin: 1.5rem auto;
  background-color: var(--bg);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: var(--shadow-md);
}

@media (min-width: 1200px) {
  #results {
    max-width: 1000px; /* Wider on large screens */
  }
}

@media (max-width: 768px) {
  #results {
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem auto;
  }
}

/* Back to form button */
#backToFormWrapper {
  display: none;
  text-align: center;
  max-width: 600px;
  margin: 1.5rem auto;
}

#backToFormBtn {
  background-color: var(--section-bg);
  border: 1px solid var(--input-border);
  color: var(--fg);
  width: auto;
  display: inline-block;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
}

#backToFormBtn:hover {
  background-color: var(--lime-light);
  color: var(--black);
}

/* Animation */
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Privacy notice */
.privacy-notice {
  font-size: 0.8rem;
  color: var(--grey-dark);
  margin-top: 1.5rem;
  text-align: left;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.5;
}

.home {
  text-decoration: none;
  color: var(--blue);
  transition: color var(--transition-fast);
}

.home:hover {
  text-decoration: underline;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  body {
    padding: 0.8rem;
  }
  
  form, 
  #results {
    padding: 1.2rem;
  }
  
  h1 {
    font-size: 1.5rem;
  }
}

@media (max-width: 600px) {
  .bottom-buttons {
    flex-direction: column;
    gap: 1rem;
  }

  #feedbackBtn,
  .bmc-btn-container {
    width: 100%;
    text-align: center;
  }
  
  .theme-toggle button {
    width: 150px;
  }
}