/* CSS Variables */
:root {
  /* Light theme colors */
  --bg-color: #f0f0f0;
  --text-color: #333;
  --container-bg: #fff;
  --input-bg: #fff;
  --input-border: #ccc;
  --button-bg: #007bff;
  --button-text: #fff;
  --link-color: #007bff;
  --viz-header-bg: #e9ecef;
  --viz-cell-bg: #f8f9fa;
  --table-border: #dee2e6;
  --table-header-bg: #f2f2f2;
  
  /* Common values */
  --border-radius: 4px;
  --transition-speed: 0.3s;
  --box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  --modal-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #f0f0f0;
  --container-bg: #1e1e1e;
  --input-bg: #222;
  --input-border: #555;
  --button-bg: #007acc;
  --button-text: #fff;
  --link-color: #00aaff;
  --viz-header-bg: #444;
  --viz-cell-bg: #333;
  --table-border: #666;
  --table-header-bg: #333;
}

/* Base Styles */
* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  padding: 2rem;
  line-height: 1.6;
  margin: 0;
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Container */
.container {
  max-width: 800px;
  margin: 0 auto;
  background: var(--container-bg);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: var(--box-shadow);
}

/* Header */
.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.header-buttons {
  display: flex;
  gap: 0.5rem;
}

h1 {
  text-align: center;
  margin: 0;
  font-size: 1.5rem;
  flex: 1;
}

/* Buttons */
button {
  cursor: pointer;
  transition: all var(--transition-speed);
}

#theme-toggle,
#help-toggle {
  padding: 0.5rem;
  background: transparent;
  color: var(--text-color);
  border: 1px solid var(--input-border);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

#theme-toggle:hover,
#help-toggle:hover {
  background: var(--viz-cell-bg);
}

#processButton {
  background: var(--button-bg);
  color: var(--button-text);
  border: none;
  padding: 0.7rem;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 500;
}

#processButton:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* Icons */
.theme-icon {
  width: 20px;
  height: 20px;
}

.sun-icon {
  display: none;
}

[data-theme="dark"] .sun-icon {
  display: block;
}

[data-theme="dark"] .moon-icon {
  display: none;
}

/* Form Elements */
label {
  font-weight: 500;
  margin-bottom: 0.5rem;
  display: block;
}

/* Output Container with Copy Button */
.output-container {
  margin-bottom: 1rem;
}

.label-with-button {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.label-with-button label {
  margin-bottom: 0;
}

.button-container {
  position: relative;
}

.copy-button {
  background: var(--viz-cell-bg);
  color: var(--text-color);
  border: 1px solid var(--input-border);
  border-radius: var(--border-radius);
  padding: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  transition: all var(--transition-speed);
  margin: 0;
}

.copy-button:hover {
  background: var(--button-bg);
  color: var(--button-text);
  transform: translateY(-1px);
}

.copy-button svg {
  pointer-events: none;
}

/* Toast Notification */
.copy-toast {
  position: absolute;
  top: -40px;
  right: 0;
  background: var(--button-bg);
  color: var(--button-text);
  padding: 6px 12px;
  border-radius: var(--border-radius);
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(10px);
  transition: all var(--transition-speed);
  pointer-events: none;
  z-index: 20;
}

.copy-toast.show {
  opacity: 1;
  transform: translateY(0);
}

.copy-toast::after {
  content: '';
  position: absolute;
  top: 100%;
  right: 16px;
  border: 5px solid transparent;
  border-top-color: var(--button-bg);
}

/* Warning Message */
.warning-message {
  font-size: 0.85rem;
  color: #e74c3c;
  margin-top: -0.5rem;
  margin-bottom: 1rem;
  padding: 0.3rem 0;
  opacity: 0;
  transform: translateY(-5px);
  transition: all var(--transition-speed);
  display: none;
}

.warning-message.show {
  opacity: 1;
  transform: translateY(0);
  display: block;
}

[data-theme="dark"] .warning-message {
  color: #ff6b6b;
}

/* File Input Container */
.input-container {
  margin-bottom: 1rem;
}

.label-with-file-button {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.label-with-file-button label {
  margin-bottom: 0;
}

.file-select-button {
  background: var(--viz-cell-bg);
  color: var(--text-color);
  border: 1px solid var(--input-border);
  border-radius: var(--border-radius);
  padding: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  transition: all var(--transition-speed);
  margin: 0;
}

.file-select-button:hover {
  background: var(--button-bg);
  color: var(--button-text);
  transform: translateY(-1px);
}

.file-select-button svg {
  pointer-events: none;
}

/* Drag and Drop Zone */
.textarea-drop-zone {
  position: relative;
}

.textarea-drop-zone.drag-over {
  border-radius: var(--border-radius);
}

.textarea-drop-zone.drag-over textarea {
  border-color: var(--button-bg);
  border-width: 2px;
  border-style: dashed;
}

.drop-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 123, 255, 0.1);
  border: 2px dashed var(--button-bg);
  border-radius: var(--border-radius);
  display: none;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 10;
}

.textarea-drop-zone.drag-over .drop-overlay {
  display: flex;
}

.drop-message {
  text-align: center;
  color: var(--button-bg);
  font-weight: 500;
}

.drop-message svg {
  margin-bottom: 0.5rem;
  opacity: 0.7;
}

.drop-message p {
  margin: 0;
  font-size: 1rem;
}

[data-theme="dark"] .drop-overlay {
  background: rgba(0, 170, 255, 0.15);
}

select,
input,
textarea,
button {
  width: 100%;
  margin-bottom: 1rem;
}

textarea,
input[type="text"],
select {
  padding: 0.5rem;
  background: var(--input-bg);
  color: var(--text-color);
  border: 1px solid var(--input-border);
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--transition-speed);
}

textarea:focus,
input[type="text"]:focus,
select:focus {
  outline: none;
  border-color: var(--button-bg);
}

#sanitizedText {
  background: var(--viz-cell-bg);
  font-family: 'Courier New', monospace;
  resize: none;
}

/* Visualization */
#visualization {
  margin-top: 2rem;
  overflow-x: auto;
  border: 1px solid var(--input-border);
  border-radius: var(--border-radius);
  padding: 1rem;
}

#visualization h3 {
  margin-top: 0;
  margin-bottom: 1rem;
}

.viz-table {
  display: table;
  width: max-content;
  border-spacing: 4px;
}

.viz-row {
  display: table-row;
}

.viz-row .header,
.viz-row .viz-cell {
  display: table-cell;
  padding: 0.6rem 0.8rem;
  text-align: center;
  border-radius: var(--border-radius);
  white-space: nowrap;
}

.viz-row .header {
  font-weight: bold;
  background: var(--viz-header-bg);
  position: sticky;
  left: 0;
  z-index: 1;
  min-width: 60px;
}

.viz-row .viz-cell {
  background: var(--viz-cell-bg);
  min-width: 40px;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.viz-row .viz-cell:hover {
  background: var(--button-bg);
  color: var(--button-text);
  transform: translateY(-2px);
}

/* Vigenère Table */
#vigenereTable {
  margin-top: 2rem;
  overflow-x: auto;
}

#vigenereTable h3 {
  margin-bottom: 1rem;
}

.vig-table {
  border-collapse: collapse;
  font-size: 0.8rem;
  margin: 0 auto;
}

.vig-table th,
.vig-table td {
  border: 1px solid var(--table-border);
  padding: 4px 6px;
  text-align: center;
  transition: all var(--transition-speed);
}

.vig-table th {
  background: var(--table-header-bg);
  font-weight: bold;
}

.vig-table td.highlight,
.vig-table th.highlight {
  background: var(--button-bg);
  color: var(--button-text);
  font-weight: bold;
}

/* Footer */
.app-footer {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.9rem;
  opacity: 0.8;
}

.app-footer a {
  color: var(--link-color);
  text-decoration: none;
}

.app-footer a:hover {
  text-decoration: underline;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
}

.modal.show {
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn var(--transition-speed);
}

.modal-content {
  background: var(--container-bg);
  border-radius: 8px;
  box-shadow: var(--modal-shadow);
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  animation: slideIn var(--transition-speed);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--input-border);
}

.modal-header h2 {
  margin: 0;
  font-size: 1.3rem;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 2rem;
  cursor: pointer;
  color: var(--text-color);
  width: auto;
  height: auto;
  padding: 0;
  line-height: 1;
  margin: 0;
  opacity: 0.7;
  transition: opacity var(--transition-speed);
}

.modal-close:hover {
  opacity: 1;
}

.modal-body {
  padding: 1.5rem;
  overflow-y: auto;
}

.modal-body h3 {
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.modal-body h3:first-child {
  margin-top: 0;
}

.modal-body p,
.modal-body li {
  line-height: 1.8;
}

.modal-body ul,
.modal-body ol {
  margin: 0.5rem 0;
  padding-left: 1.5rem;
}

.modal-body strong {
  color: var(--button-bg);
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideIn {
  from {
    transform: translateY(-30px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Responsive Design */
@media (max-width: 600px) {
  body {
    padding: 1rem;
  }
  
  .container {
    padding: 1.5rem;
  }
  
  h1 {
    font-size: 1.2rem;
  }
  
  .header-container {
    justify-content: center;
  }
  
  .viz-row .header {
    min-width: 50px;
    padding: 0.4rem;
  }
  
  .viz-row .viz-cell {
    padding: 0.4rem;
    min-width: 30px;
  }
  
  .vig-table {
    font-size: 0.7rem;
  }
  
  .vig-table th,
  .vig-table td {
    padding: 2px 4px;
  }
}

/* Print Styles */
@media print {
  body {
    background: white;
    color: black;
  }
  
  .container {
    box-shadow: none;
    max-width: 100%;
  }
  
  .header-buttons,
  .app-footer,
  .modal {
    display: none;
  }
  
  #visualization,
  #vigenereTable {
    break-inside: avoid;
  }
}