:root{
  --sidebar-bg: #fff;
  --sidebar-text: var(--text);
  --sidebar-hover-bg: rgba(0,0,0,0.06);
  --bg:#C5C5C5;
  --card:#fff;
  --text:#111;
  --muted:#666;
  --accent:#333;
  --secondary: #0022a8;
}

body.dark{
  --sidebar-bg:#0f0f0f;
  --sidebar-text:#fff;
  --sidebar-hover-bg: rgba(255,255,255,0.06);
  --bg:#121212;
  --card:#1f1f1f;
  --text:#eaeaea;
  --muted:#999;
  --accent:#444;
  --secondary: #ffdd57;
}

*{box-sizing:border-box}
body{
  margin:0;
  font-family:Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background:var(--bg);
  color:var(--text);
  display:flex;
  min-height:100vh;
}

.topbar{
  position:fixed;
  left:0;
  right:0;
  top:0;
  height:56px;
  display:flex;
  align-items:center;
  padding:0 16px;
  background:var(--card);
  border-bottom:1px solid rgba(0,0,0,0.06);
  z-index:30;
}
.topbar h1{
  margin:0 12px;
  font-size:1rem
}

.topbar .top-actions{
  margin-left:auto
}

.topbar #hamburger{
  font-size:20px;
  padding:8px;
  background:transparent;
  border:none;
  cursor:pointer;
  color: var(--text);
}

.sidebar{
  width:240px;
  padding:84px 16px 16px 16px;
  background:var(--sidebar-bg);
  color:var(--sidebar-text);
  position:fixed;
  top:0;
  bottom:0;
  left:0;
  overflow:auto;
  transition:transform .25s ease;
  z-index:20;
}
.brand h2{margin:0 0 12px 0}

.sidebar nav ul{
  list-style:none;
  padding:0;
  margin:0;
  color: var(--secondary);;
}

.sidebar nav li{
  padding:10px 12px;
  border-radius:8px;
  margin-bottom:8px;
  cursor:pointer;
  transition:background .15s;
}

.sidebar nav li.active, .sidebar nav li:hover{
  background: var(--sidebar-hover-bg);
}

.main-content{
  margin-left:240px;
  padding:84px 28px 28px 28px;
  overflow:auto;
  flex:1;
}

nav li i,
h2 i {
  margin-right: 8px;
  width: 20px;
  text-align: center;
  color: var(--sidebar-text);
}

#vigenereEncryptBtn i,
#vigenereDecryptBtn i,
#getComplementaryBtn i {
  margin-right: 6px;
}

.card{
  background:var(--card);
  border-radius:10px;
  padding:18px;
  margin-bottom:18px;
  box-shadow:0 6px 18px rgba(0,0,0,0.06);
}

.tool{display:none}

.tool.active{display:block}

.file-drop {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  border: 2px dashed var(--muted);
  padding: 48px 18px;
  min-height: 150px;
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s;
}

.file-drop:hover, .file-drop.dragover {
  background-color: var(--sidebar-hover-bg);
  border-color: var(--accent);
}

.file-drop input { display: none; }

.file-drop span {
  display: block;
  text-align: center;
  color: var(--muted);
  font-size: 1.1em;
}

.controls-row{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  align-items:center;
  margin-top:12px
}

.controls-row label{
  display:flex;
  align-items:center;
  gap:6px
}

input[type="number"], 
input[type="text"], 
select, 
textarea {
  padding: 8px;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--card);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  box-sizing: border-box;
}

textarea[readonly] {
  background: var(--bg);
  color: var(--text);
  cursor: default;
}

button{padding:8px 12px;
  border-radius:8px;
  border:none;
  background:var(--accent);
  color:white;cursor:pointer
}

button[disabled]{
  opacity:.6;
  cursor:default
}

.preview-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
  gap:14px;margin-top:12px;
  align-items:start;
  max-height: 800px;
  overflow-y: auto;
}

.preview-item{
  background:var(--card);
  border:1px solid rgba(0,0,0,0.05);
  padding:8px;
  border-radius:10px;
  display:flex;
  flex-direction:column;
  gap:8px;align-items:stretch;
  transition:transform .15s, box-shadow .15s;
  position: relative;
}

.preview-remove-btn {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.6);
  color: lightcoral;
  border: none;
  font-size: 14px;
  font-weight: bold;
  line-height: 22px;
  text-align: center;
  padding: 0;
  cursor: pointer;
  opacity: 0.8;
  transition: all 0.15s;
  z-index: 2;
}

.preview-remove-btn:hover {
  background: rgba(0, 0, 0, 0.9);
  opacity: 1;
  transform: scale(1.1);
}

.preview-item:hover{
  transform:translateY(-4px);
  box-shadow:0 8px 20px rgba(0,0,0,0.08)
}

.preview-thumb{
  display:block;
  overflow:hidden;
  border-radius:8px;
  height:120px;
  display:flex;
  align-items:center;
  justify-content:center;
  background:rgba(0,0,0,0.02)
}

.preview-thumb img{
  max-width:100%;
  max-height:100%;
  transition:transform .25s
}

.preview-thumb:hover img{
  transform:scale(1.08)
}

.preview-meta{
  display:flex;
  justify-content:space-between;
  align-items:center;
  font-size:13px;
  color:var(--muted);
}

.preview-filename{
  display:inline-block;
  max-width:120px;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
  vertical-align:middle;
}

.preview-actions{
  display:flex;
  gap:8px;
  align-items:center;
  justify-content:space-between;
}

.icon-btn {
  font-size: 1.2rem;
  padding: 6px;
  line-height: 1;
}

.settings-wrapper {
  position: relative;
  margin-left: auto;
}

.settings-popup {
  display: none;
  position: absolute;
  right: 0;
  top: 100%;
  margin-top: 8px;
  background: var(--card);
  border: 1px solid rgba(0,0,0,0.1);
  border-radius: 8px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.08);
  padding: 16px;
  z-index: 10;
  width: 320px;
  flex-direction: column;
  gap: 12px;
}

.settings-popup.visible {
  display: flex;
}

.settings-popup label {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
}

.settings-popup input[type="number"] {
  width: 100%;
}

.settings-popup {
  width: 320px;
  padding: 16px;
  gap: 12px;
}

.settings-row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.settings-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.settings-col label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  margin: 0;
  display: block;
  width: 100%;
  white-space: nowrap;
}

.checkbox-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.compact-check {
  flex-direction: row !important;
  align-items: center !important;
  font-size: 0.9rem;
  cursor: pointer;
  white-space: nowrap;
}

.settings-divider {
  height: 1px;
  background: rgba(0,0,0,0.1);
  margin: 4px 0;
  width: 100%;
}

body.dark .settings-divider {
  background: rgba(255,255,255,0.1);
}

.full-color-input {
  width: 100%;
  height: 36px;
  padding: 0;
  border: 1px solid var(--accent);
  border-radius: 6px;
  cursor: pointer;
}

.range-wrapper {
  display: flex;
  align-items: center;
  height: 36px;
}
.range-wrapper input {
  width: 100%;
  margin: 0;
}

.stats-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 12px;
  font-size: 0.9em;
  color: var(--muted);
}

.stats-row div {
  white-space: nowrap;
}

.pdf-tool-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.pdf-tool-option {
  border: 1px solid var(--accent);
  padding: 12px;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
}

.pdf-tool-option h3 {
  margin-top: 0;
  margin-bottom: 4px;
}

.pdf-tool-option p {
  margin-top: 0;
  margin-bottom: 12px;
}

.pdf-tool-option {
  position: relative;
  border: 1px solid var(--accent);
  padding: 12px;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
}

.pdf-clear-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent);
  color: lightcoral;
  border: none;
  font-size: 16px;
  font-weight: bold;
  line-height: 24px;
  text-align: center;
  padding: 0;
  cursor: pointer;
  opacity: 0.7;
  transition: all 0.15s;
  z-index: 2;
}

.pdf-clear-btn:hover {
  opacity: 1;
  transform: scale(1.1);
}

#qrCanvas{
  display:block;
  margin-top:12px;
  border:1px solid rgba(0,0,0,0.08);
  background:white;
}

.wide-textarea{
  width:100%;
  min-width:700px;
  max-width:100%
}

.color-converter-layout {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: flex-start;
  margin-top: 16px;
}

.color-picker-wrapper {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  margin: 0 auto;
}

#colorPicker {
  width: 200px;
  height: 200px;
  border: none;
  padding: 0;
  background: none;
  cursor: pointer;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--accent); 
}

#colorPicker::-webkit-color-swatch-wrapper {
  padding: 0;
}
#colorPicker::-webkit-color-swatch {
  border: none;
  border-radius: 8px;
}

#colorPicker::-moz-color-swatch {
  border: none;
  border-radius: 8px;
}

.color-inputs-wrapper {
  flex: 1;
  min-width: 260px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.color-input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.color-input-group label {
  font-weight: bold;
  font-size: 0.9em;
  color: var(--muted);
  margin-left: 2px;
}

.color-input-group .input-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.color-input-group #hexInput {
  width: 100%;
  font-family: monospace;
  font-size: 1.1rem;
}

.slider-input-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  margin-bottom: 4px;
}

.slider-input-row input[type="range"] {
  width: 100%;
  margin: 0;
}

.slider-input-row span {
  font-family: monospace;
  font-size: 1rem;
  text-align: right;
  width: 3.5em;
  color: var(--muted);
}

#listOutput {
  margin-top: 12px;
}

.citation-form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 12px 18px;
  margin-top: 16px;
}

.cite-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.cite-group label {
  font-size: 0.9em;
  color: var(--muted);
}

.cite-group input {
  width: 100%;
}

.citation-output {
  width: 100%;
  min-height: 120px;
  padding: 8px;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.citation-output i {
  font-style: italic;
}

.diff-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 16px;
}

.diff-pane {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.diff-textarea {
  width: 100%;
  height: 300px;
  font-family: monospace;
  font-size: 0.9rem;
  resize: vertical;
  padding: 8px;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--card);
  color: var(--text);
  box-sizing: border-box;
}

.diff-output {
  background: var(--bg);
  border: 1px solid var(--accent);
  border-radius: 8px;
  margin-top: 6px;
  max-height: 1000px;
  overflow: auto;
}

.diff-output pre {
  margin: 0;
  padding: 12px;
  font-family: monospace;
  font-size: 0.9rem;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.diff-output .diff-added {
  color: #0d6811;
  background-color: rgba(76, 175, 80, 0.15);
  text-decoration: none;
}

.diff-output .diff-removed {
  color: #a30e0e;
  background-color: rgba(244, 67, 54, 0.15);
  text-decoration: line-through;
}

.diff-output .diff-common {
  color: var(--muted);
  opacity: 0.8;
}

.line-num {
  display: inline-block;
  color: var(--muted);
  opacity: 0.7;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  font-family: monospace;
  white-space: pre;
}

body.dark .diff-output .diff-added {
  color: #61e067;
  background-color: rgba(97, 224, 103, 0.1);
}

body.dark .diff-output .diff-removed {
  color: #ff7272;
  background-color: rgba(255, 114, 114, 0.1);
}

@media (max-width:1000px){
  .sidebar{transform:translateX(-100%);position:fixed}
  .main-content{margin-left:0;padding-left:16px;padding-right:16px}
  .wide-textarea{min-width:unset}
  .preview-thumb{height:100px}
}

/* Override for iPads (or any tablet) in landscape mode */
@media (orientation: landscape) and (min-width: 768px) {
  .sidebar {
    transform: none;
    position: relative;
  }
  .main-content{margin-left:0;padding-left:16px;padding-right:16px}
}

@media (max-width:480px){
  .controls-row{flex-direction:column;align-items:stretch}
  .preview-grid{grid-template-columns:repeat(2,1fr)}
}

@media (max-width: 768px) {
  .diff-layout {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .diff-textarea {
    height: 200px;
  }
}

@media (min-width: 1000px) {
  .sidebar {
    transform: none !important;
  }
}

.muted{color:var(--muted);margin-top:8px}