:root {
  /* Palette */
  --primary: #4f46e5;
  /* Indigo 600 */
  --primary-hover: #4338ca;
  /* Indigo 700 */
  --bg-page: #f8fafc;
  /* Slate 50 */
  --bg-card: #ffffff;
  --text-main: #0f172a;
  /* Slate 900 */
  --text-muted: #64748b;
  /* Slate 500 */
  --border-color: #e2e8f0;
  /* Slate 200 */
  --highlight-bg: transparent;
  --highlight-text: #dc2626;
  /* Red 600 */
  --success-bg: #dcfce7;
  --success-text: #166534;

  /* Spacing & Radius */
  --radius: 12px;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-family);
  background-color: var(--bg-page);
  color: var(--text-main);
  padding: 40px 20px;
  line-height: 1.5;
}

.app-container {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 30px;
}

/* Header */
header {
  text-align: center;
  margin-bottom: 10px;
}

h1 {
  font-size: 2rem;
  font-weight: 700;
  margin: 0 0 8px 0;
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, #4f46e5, #ec4899);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

p.subtitle {
  color: var(--text-muted);
  margin: 0;
  font-size: 1rem;
}

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.card-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #fdfdfd;
}

.card-title {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-body {
  padding: 24px;
}

/* Custom Words Section (Dictionary) */
.settings-area {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.input-group {
  display: flex;
  gap: 10px;
}

input[type="text"] {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

input[type="text"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

button {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.95rem;
}

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

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

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.btn-outline:hover {
  border-color: var(--text-muted);
  color: var(--text-main);
}

.btn-danger-outline {
  color: #dc2626;
  border: 1px solid #fecaca;
  background: #fef2f2;
}

.btn-danger-outline:hover {
  background: #fee2e2;
  border-color: #fca5a5;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.85rem;
}

.mr-2 {
  margin-right: 8px;
}

.chips-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 48px;
  /* reserve space */
  padding: 8px;
  background: #f1f5f9;
  border-radius: 8px;
  align-items: center;
}

.chip {
  background: white;
  border: 1px solid var(--border-color);
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-main);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  animation: fadeIn 0.2s ease;
}

.chip-remove {
  cursor: pointer;
  color: #94a3b8;
  font-weight: bold;
  font-size: 1.1em;
  line-height: 1;
}

.chip-remove:hover {
  color: #ef4444;
}

.empty-state {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-style: italic;
  padding-left: 4px;
}

/* Grid Layout for Encryption/Decryption */
.editor-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

@media (max-width: 768px) {
  .editor-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

.editor-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.col-label {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.label-hint {
  font-size: 0.8em;
  font-weight: 400;
  color: var(--text-muted);
}

/* Textarea & Highlights */
.editor-wrapper {
  position: relative;
  height: 250px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: white;
  overflow: hidden;
  /* Important for alignment */
}

.editor-wrapper-short {
  height: 180px;
}

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

.editor-input,
.editor-highlight {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 16px;
  border: none;
  font-family: 'Inter', monospace;
  font-size: 15px;
  line-height: 1.6;
  box-sizing: border-box;
  background: transparent;
  white-space: pre-wrap;
  word-break: break-word;
  overflow: auto;
}

/* The Highlight Layer */
.editor-highlight {
  position: absolute;
  top: 0;
  left: 0;
  color: transparent;
  pointer-events: none;
  user-select: none;
  z-index: 1;
}

.editor-highlight .highlight-word {
  /* Red Underline */
  text-decoration: underline;
  text-decoration-color: var(--highlight-text);
  text-decoration-thickness: 2px;
  text-underline-offset: 2px;
  color: transparent;
}

/* The Real Input */
.editor-input {
  position: relative;
  z-index: 2;
  resize: none;
  outline: none;
  color: inherit;
  background: transparent;
  /* allow seeing behind if needed, but we layer differently */
}

.editor-input {
  background: transparent;
}

.readonly-area {
  background-color: #f8fafc;
  color: var(--text-muted);
}

/* Utilities */
.copy-btn {
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 6px;
  background: #eef2ff;
  color: var(--primary);
  border: 1px solid #c7d2fe;
  cursor: pointer;
  transition: all 0.2s;
}

.copy-btn:hover {
  background: #e0e7ff;
}

.copy-btn.copied {
  background: var(--success-bg);
  color: var(--success-text);
  border-color: #bbf7d0;
}

/* POS Toggles */
.pos-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.pos-chip {
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  cursor: pointer;
  border: 1px solid var(--border-color);
  background: white;
  color: var(--text-muted);
  transition: all 0.2s;
  user-select: none;
}

.pos-chip:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.pos-chip.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  box-shadow: 0 2px 4px rgba(79, 70, 229, 0.2);
}

.settings-divider {
  height: 1px;
  background-color: var(--border-color);
  margin: 20px 0;
}

.settings-label {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 10px;
  display: block;
  color: var(--text-main);
}

.helper-text {
  margin: 0 0 4px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.helper-highlight-example {
  text-decoration: underline;
  text-decoration-color: #dc2626;
  /* Hardcoded to match var */
  text-decoration-thickness: 2px;
  text-underline-offset: 2px;
  color: var(--text-main);
}

/* Key Animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(2px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}