:root{
  --spacing: 1rem;
  --font-size: 1rem;
  --border-radius: 0.5rem;
  --primary-color: #0077cc;
  --secondary-color: #f5f5f5;
  --text-color: #333;
  --text-light: #fff;
  --error-color: #ff3333;
  --button-padding: 0.5rem 1rem;
  --input-padding: 0.5rem;
  --transition-speed: 0.2s;
}

body {
  font-size: var(--font-size);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
}

main.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 1rem;
}

h1 {
  margin-bottom: 0.5rem;
  font-size: 2rem;
  color: var(--primary-color);
}

/* Controls */
.controls-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.compact-control {
  padding: 0.25rem 0.5rem;
  font-size: 0.85rem;
  border-radius: var(--border-radius);
  border: 1px solid #ddd;
  box-sizing: border-box;
  transition: border-color var(--transition-speed) ease;
}

.controls-row label {
  margin-right: 0.25rem;
  font-size: 0.85rem;
}

#revision, #bits {
  width: 4.5rem;
  height: 2rem;
}

.compact-control:focus {
  border-color: var(--primary-color);
  outline: none;
}

hr {
  border: none;
  border-top: 1px solid #eee;
  margin: 1rem 0;
}

/* Tabs */
.tabs {
  display: flex;
  margin-bottom: 0;
  margin-top: 50px;
}

.tabs button {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  background-color: transparent;
  color: var(--text-color);
  border: 1px solid #ddd;
  border-bottom: none;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
}

.tabs button:hover {
  background-color: #005fa3;
  color: #fff;
}

.tabs .tab-active {
  background-color: var(--primary-color);
  color: var(--text-light);
  border-color: var(--primary-color);
  border-bottom: none;
  border-radius: var(--border-radius) var(--border-radius) 0 0;
}

/* Panels */
[data-panel] {
  margin-top: 0;
  padding: 1rem;
  border: 1px solid #ddd;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  background-color: #fff;
}

[hidden] {
  display: none !important;
}

/* File panel */
input[type="file"] {
  margin-bottom: 0.5rem;
}

#fileInfo {
  font-size: 0.9rem;
  opacity: 0.8;
  margin-bottom: 0.5rem;
}

/* Buttons */
button {
  padding: var(--button-padding);
  font-size: 1rem;
  border-radius: var(--border-radius);
  background-color: var(--primary-color);
  color: var(--text-light);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-speed) ease;
  position: relative; /* Needed for progress-fill */
  overflow: hidden;   /* Keep progress inside button */
}

button:hover {
  background-color: #005fa3;
}

/* Fixed Progress Bar Button Styles */
#hashFileBtn {
  width: 100%;
  position: relative;
  overflow: hidden;
  transition: all 0.2s ease;
  min-height: 3rem;
  /* Ensure consistent z-index stacking */
  z-index: 1;
}

#hashFileBtn .btn-text {
  position: relative;
  z-index: 3;
  transition: color 0.2s ease;
  display: block;
  width: 100%;
}

#hashFileBtn .progress-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, 
    rgba(0, 119, 204, 0.8), 
    rgba(0, 119, 204, 0.6)
  );
  transition: width 0.2s ease;
  z-index: 2;
  border-radius: var(--border-radius);
}

#hashFileBtn.hashing .progress-fill {
  background: linear-gradient(90deg, 
    rgba(0, 95, 163, 0.9), 
    rgba(0, 95, 163, 0.7)
  );
}

#hashFileBtn.hashing {
  cursor: wait;
}

/* Animation for progress shimmer */
@keyframes progress-shine {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

#hashFileBtn .progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  animation: progress-shine 2s infinite;
  opacity: 0;
}

#hashFileBtn.hashing .progress-fill::after {
  opacity: 1;
}

/* Ensure text remains visible over progress */
#hashFileBtn.hashing .btn-text {
  color: var(--text-light);
  font-weight: 500;
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

/* String panel */
textarea {
  width: 95%;
  padding: 10px;
  font-size: 1rem;
  display: block;
  border-radius: var(--border-radius);
  border: 1px solid #ddd;
  resize: vertical;
  min-height: 8rem;
  transition: border-color var(--transition-speed) ease;
}

textarea:focus {
  border-color: var(--primary-color);
  outline: none;
}

/* Error */
#err {
  color: var(--error-color);
  min-height: 1.2rem;
  margin-bottom: 0.5rem;
}

/* Digest */
h2 {
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
}

.digest-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.digest-row pre {
  flex: 1;
  margin: 0;
  padding: var(--input-padding);
  border-radius: var(--border-radius);
  border: 1px solid #ddd;
  overflow: auto;
  max-height: 15rem;
  min-height: 2.5rem;
  white-space: pre-wrap;
  word-break: break-all;
  background-color: #f9f9f9;
}

.copy-container {
  display: flex;
  flex-direction: column; /* Stack items vertically */
  align-items: center; /* Center items horizontally */
  gap: 0.25rem; /* Add small gap between button and message */
}

#copyBtn {
  background: none;
  border: none;
  padding: 0.5rem;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--primary-color);
  transition: opacity var(--transition-speed) ease;
  margin: 0; /* Remove any margin that might affect alignment */
}

#copyBtn:hover {
  opacity: 0.7;
}

#copyMsg {
  opacity: 0;
  transition: opacity var(--transition-speed) ease;
  font-size: 0.75rem; /* Make the message smaller */
  color: var(--primary-color);
  text-align: center; /* Center the text */
  min-height: 1rem; /* Ensure consistent height */
}

#copyMsg.show {
  opacity: 1;
}

/* Perf Info */
#perfInfo {
  gap: 0.5rem 1rem;
  margin-top: 0.5rem;
}