/* Minimal Non-Stylized Black & White CSS */

/* CSS Reset & Variables */
:root {
  --color-bg: #ffffff;
  --color-fg: #000000;
  --color-border: #000000;
  --color-border-light: #cccccc;
  --color-bg-hover: #000000;
  --color-fg-hover: #ffffff;

  --font-family: "Courier New", Courier, monospace, system-ui;
}

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

body {
  background-color: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-family);
  line-height: 1.5;
  padding: 2rem 1rem;
  display: flex;
  justify-content: center;
}

.app-container {
  width: 100%;
  max-width: 420px; /* Constrain globally to mobile width */
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Split Workspace layout */
.workspace-split {
  display: flex;
  flex-direction: column-reverse;
  gap: 1rem;
  align-items: center;
  width: 100%;
}

.left-column {
  width: 100%;
  max-width: 500px;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.output-canvas-wrapper {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.cipher-canvas-9-16 {
  width: 100%;
  max-width: 380px;
  min-height: 320px; /* Compact initial height, grows dynamically */
  border: none;
  padding: 3rem 2.5rem;
  background-color: var(--color-bg);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  box-sizing: border-box;
}

/* Header */
.app-header {
  border-bottom: 3px double var(--color-border);
  padding-bottom: 0.75rem;
}

.app-header h1 {
  font-size: 1.6rem; /* Mobile header size */
  font-weight: 900;
  letter-spacing: -1px;
}

.subtitle {
  font-size: 0.95rem;
  text-transform: uppercase;
  margin-top: 0.25rem;
  color: #555555;
}

/* Panel Styles */
.panel {
  border: 1px solid var(--color-border);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.panel-title {
  font-size: 1.1rem;
  font-weight: bold;
  text-transform: uppercase;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
  margin-bottom: 0.5rem;
}

.panel-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
  margin-bottom: 0.5rem;
}

.panel-header-row .panel-title {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0;
}

/* Inputs & Form Elements */
textarea {
  width: 100%;
  padding: 0.75rem;
  font-family: var(--font-family);
  font-size: 1rem;
  color: var(--color-fg);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  resize: vertical;
  text-transform: uppercase;
  /* Match typewriter style inputs */
}

textarea:focus {
  outline: 2px solid var(--color-border);
  outline-offset: -2px;
}

/* Controls layout */
.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  padding-top: 0.5rem;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.control-group label {
  font-size: 0.9rem;
  font-weight: bold;
}

/* Buttons */
.btn {
  background-color: var(--color-bg);
  color: var(--color-fg);
  border: 1px solid var(--color-border);
  padding: 0.5rem 1rem;
  font-family: var(--font-family);
  font-size: 0.9rem;
  font-weight: bold;
  cursor: pointer;
  text-transform: uppercase;
  transition: background-color 0.1s ease, color 0.1s ease;
}

.btn:hover {
  background-color: var(--color-bg-hover);
  color: var(--color-fg-hover);
}

.btn:active {
  outline: 1px dotted var(--color-border);
}

.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.8rem;
}

/* Select Input */
.select-input {
  background-color: var(--color-bg);
  color: var(--color-fg);
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.75rem;
  font-family: var(--font-family);
  font-size: 0.9rem;
  font-weight: bold;
  cursor: pointer;
  text-transform: uppercase;
}

.select-input:focus {
  outline: 2px solid var(--color-border);
}

/* Checkbox */
.checkbox-label {
  font-size: 0.9rem;
  font-weight: bold;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  accent-color: var(--color-fg);
  width: 1rem;
  height: 1rem;
  cursor: pointer;
}

/* Badge */
.badge {
  font-size: 0.85rem;
  font-weight: bold;
  border: 1px solid var(--color-border);
  padding: 0.2rem 0.5rem;
  text-transform: uppercase;
}

/* Cipher Grid - Crucial Right-To-Left 10 columns */
.cipher-grid {
  display: grid;
  grid-template-columns: repeat(10, 24px);
  gap: 5px;
  width: 285px;
  margin: 0 auto;
}

/* Center placeholder vertically inside the canvas when empty */
.cipher-grid:has(.grid-placeholder) {
  margin: auto auto;
}

.grid-placeholder {
  grid-column: span 10;
  text-align: center;
  padding: 2.5rem 0;
  color: #888888;
  font-style: italic;
  font-size: 0.9rem;
  direction: ltr;
  /* Ensure text read correctly */
}

/* Cipher Cell */
.cipher-cell {
  width: 24px;
  height: 24px;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: bold;
  background-color: var(--color-bg);
  user-select: none;
  position: relative;
  box-sizing: border-box;
  transition: background-color 0.15s ease;
}

/* Active typing animation class */
.cipher-cell.just-typed {
  background-color: var(--color-border);
  color: var(--color-bg);
}

/* Empty Cell in Pre-ruled Grid */
.cipher-cell.empty {
  border: none;
  color: transparent;
}

/* Tooltip on hover (shows original letter in small text) */
.cipher-cell::after {
  content: attr(data-letter);
  position: absolute;
  bottom: 1px;
  right: 2px;
  font-size: 0.55rem;
  color: #888888;
  opacity: 0;
  transition: opacity 0.1s ease;
}

.cipher-cell:not(.empty):hover::after {
  opacity: 1;
}

/* Legend Styling */
.legend-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}

.legend-header .panel-title {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0;
}

.legend-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 0.75rem;
  transition: max-height 0.3s ease, opacity 0.3s ease;
}

.legend-grid.hidden {
  display: none;
}

.legend-item {
  border: 1px solid var(--color-border-light);
  padding: 0.4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
}

.legend-letter {
  font-weight: bold;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--color-border-light);
  width: 100%;
  text-align: center;
  padding-bottom: 0.1rem;
}

.legend-symbols {
  display: flex;
  gap: 0.3rem;
  flex-wrap: wrap;
  justify-content: center;
  font-size: 1.1rem;
}

.legend-symbol {
  font-family: var(--font-family);
}

/* Footer */
.app-footer {
  text-align: center;
  font-size: 0.75rem;
  color: #777777;
  border-top: 1px solid var(--color-border-light);
  padding-top: 1rem;
  margin-top: 2rem;
}



@media (max-width: 600px) {
  body {
    padding: 1rem 0.5rem;
  }

  .panel {
    padding: 1rem;
  }

  .controls {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .app-header h1 {
    font-size: 1.75rem;
  }

  .cipher-grid {
    gap: 0.25rem;
  }

  .cipher-cell {
    font-size: 1.2rem;
  }
}