:root {
  --crimson: #A51C30;
  --crimson-dark: #820000;
  --gold: #FFC72C;
  --gold-dark: #FFD700;
  --bg: #f5f5f5;
  --info-bg: #fff8e1;
  --table-bg: #fff;
  --text-main: #263238;
  --highlight: #FFC72C;
  --highlight-text: #A51C30;
  --found: #22c55e;
  --deleted: #ef4444;
  --step-glow: 0 0 8px 2px #A51C30AA;
}
body {
  font-family: 'Merriweather', Georgia, serif;
  background: var(--bg);
  margin: 0;
  padding: 0;
  color: var(--text-main);
  transition: background 0.3s, color 0.3s;
}
.dark-mode {
  --crimson: #ffb74d;
  --crimson-dark: #ffd54f;
  --gold: #ffecb3;
  --gold-dark: #ffe082;
  --bg: #181a1b;
  --info-bg: #23272a;
  --table-bg: #23272a;
  --text-main: #f5f5f5;
  --highlight: #ffb74d;
  --highlight-text: #181a1b;
  --found: #43e97b;
  --deleted: #ef5350;
  --step-glow: 0 0 8px 2px #ffb74daa;
}
.dark-mode body {
  background: var(--bg);
  color: var(--text-main);
}
.dark-mode .container {
  background: var(--table-bg);
  border: 1px solid #222;
  box-shadow: 0 4px 24px #000a;
}
.dark-mode .info,
.dark-mode .stats-panel,
.dark-mode .probing-sequence,
.dark-mode .history-panel {
  background: var(--info-bg) !important;
  color: var(--text-main);
  border-color: var(--crimson);
}
.dark-mode table,
.dark-mode #sortedArrayTable {
  background: var(--table-bg);
  color: var(--text-main);
}
.dark-mode th {
  background: var(--crimson);
  color: #181a1b;
}
.dark-mode td {
  background: #23272a;
  color: var(--text-main);
}
.dark-mode td:hover {
  background: #333;
  color: var(--highlight);
  box-shadow: 0 0 0 2px var(--crimson);
}
.dark-mode input[type="number"],
.dark-mode select {
  background: #23272a;
  color: var(--text-main);
  border: 1px solid #444;
}
.dark-mode input[type="number"]:focus,
.dark-mode select:focus {
  border: 1.5px solid var(--crimson);
}
.dark-mode button,
.dark-mode .step-btn {
  background: var(--crimson);
  color: #181a1b;
}
.dark-mode .reset-btn,
.dark-mode .undo-btn {
  background: var(--gold);
  color: #181a1b;
}
.dark-mode .reset-btn:hover,
.dark-mode .undo-btn:hover {
  background: var(--gold-dark);
  color: #23272a;
}
.dark-mode #message {
  background: #23272a;
  color: var(--crimson);
  border-left: 3px solid var(--crimson);
}
.dark-mode .load-bar-container {
  background: #23272a;
}
.dark-mode .load-bar-label {
  color: var(--crimson-dark);
}
.dark-mode .history-entry {
  background: #23272a;
  color: var(--text-main);
}
.dark-mode .share-embed-panel button {
  background: var(--gold);
  color: #181a1b;
}
.dark-mode .share-embed-panel button:hover {
  background: var(--gold-dark);
  color: #23272a;
}
.dark-mode .share-input {
  background: #23272a;
  color: var(--crimson);
  border: 1px solid var(--crimson);
}
.container {
  max-width: 900px;
  margin: 30px auto;
  background: var(--table-bg);
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
  padding: 32px 40px 24px 40px;
  transition: background 0.3s;
}
h2 {
  text-align: center;
  color: var(--crimson);
  margin-bottom: 8px;
  font-family: 'Merriweather', Georgia, serif;
  font-weight: 700;
}
.header-block {
  text-align: center;
  margin-bottom: 20px;
}

.main-title {
  font-family: 'Merriweather', serif;
  font-size: 2.2em;
  font-weight: 700;
  color: var(--crimson, #A51C30);
  margin-bottom: 0.15em;
  line-height: 1.1;
}

.subtitle {
  font-size: 1.1em;
  color: var(--crimson-dark, #820000);
  margin-bottom: 0.5em;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.author {
  font-size: 1em;
  color: var(--crimson-dark, #820000);
  opacity: 0.95;
  margin-bottom: 0.5em;
}
.info {
  background: var(--info-bg);
  border-left: 5px solid var(--crimson);
  padding: 8px 10px;
  margin-bottom: 18px;
  border-radius: 6px;
  color: var(--text-main);
  font-size: 0.93em;
  transition: background 0.3s, color 0.3s;
  position: relative;
}
.about-toggle-row {
  display: flex;
  align-items: center;
  margin-bottom: 4px;
  margin-top: 4px;
}
.about-toggle {
  background: var(--gold);
  color: var(--crimson);
  border: none;
  border-radius: 4px;
  font-size: 1.2em;
  cursor: pointer;
  margin-right: 2px;
  padding: 2px 10px;
  transition: background 0.2s, color 0.2s;
}
.about-toggle:hover {
  background: var(--gold-dark);
}
.info.hide {
  display: none;
}
.help-toggle {
  float: right;
  background: none;
  border: none;
  color: var(--crimson);
  font-size: 1.2em;
  cursor: pointer;
  margin-top: -4px;
  margin-right: 2px;
  transition: color 0.2s;
}
.help-toggle:focus {
  outline: 2px solid var(--gold);
}
.help-content {
  display: none;
  background: var(--info-bg);
  border: 1px solid var(--crimson);
  border-radius: 6px;
  padding: 10px 14px;
  margin-bottom: 14px;
  font-size: 0.97em;
  color: var(--text-main);
}
.help-content.active {
  display: block;
  animation: fadein 0.4s;
}
.dark-mode .help-content,
.dark-mode .info {
  color: #f5f5f5;
}
.input-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  padding: 0 0 8px 0;
}
input[type="number"] {
  padding: 7px 10px;
  font-size: 1em;
  border: 1px solid #b0bec5;
  border-radius: 4px;
  width: 120px;
  outline: none;
  transition: border 0.2s;
  font-family: 'Merriweather', Georgia, serif;
  background: var(--bg);
  color: var(--crimson);
}
input[type="number"]:focus {
  border: 1.5px solid var(--crimson);
}
select {
  padding: 7px 10px;
  font-size: 1em;
  border: 1px solid #b0bec5;
  border-radius: 4px;
  outline: none;
  background: #fff;
  color: var(--text-main);
  transition: border 0.2s;
  font-family: 'Merriweather', Georgia, serif;
}
button, .step-btn {
  padding: 7px 18px;
  font-size: 1em;
  border: none;
  border-radius: 4px;
  background: var(--crimson);
  color: #fff;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  font-family: 'Merriweather', Georgia, serif;
}
.undo-btn {
  background: var(--gold);
  color: var(--crimson);
  margin-left: 10px;
  transition: background 0.2s, color 0.2s;
}
.undo-btn:hover {
  background: var(--gold-dark);
}
button[aria-label], .step-btn[aria-label] {
  position: relative;
}
button[aria-label]:hover::after, .step-btn[aria-label]:hover::after {
  content: attr(aria-label);
  position: absolute;
  left: 50%;
  top: -2em;
  transform: translateX(-50%);
  background: var(--crimson);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.9em;
  white-space: nowrap;
  z-index: 10;
  pointer-events: none;
}
button:hover, .step-btn:hover:not(:disabled) {
  background: var(--crimson-dark);
}
.reset-btn {
  background: var(--gold);
  color: var(--crimson);
  margin-left: 10px;
  transition: background 0.2s, color 0.2s;
}
.reset-btn:hover {
  background: var(--gold-dark);
}
.dark-mode .reset-btn {
  background: var(--crimson);
  color: var(--gold);
}
#darkModeToggle {
  float: right;
  margin-top: 2px;
  margin-right: 2px;
  background: var(--crimson);
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 4px 12px;
  font-size: 1em;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
#darkModeToggle:hover {
  background: var(--crimson-dark);
}
#message {
  text-align: center;
  margin-bottom: 18px;
  font-size: 1.1em;
  min-height: 24px;
  color: var(--crimson);
  font-weight: bold;
  font-family: 'Merriweather', Georgia, serif;
}
.formula {
  text-align: center;
  margin-bottom: 44px;
  font-size: 1.08em;
  color: #37474f;
  font-family: 'Merriweather', Georgia, serif;
}
.formula span {
  border-radius: 1px;
  padding: 2px 2px;
  font-family: 'Merriweather', Georgia, serif;
  color: var(--crimson);
  font-weight: bold;
}
table {
  border-collapse: collapse;
  margin: 0 auto 0 auto;
  background: var(--table-bg);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(33,150,243,0.07);
  font-family: 'Merriweather', Georgia, serif;
  transition: background 0.3s;
}
th, td {
  border: 1px solid #b0bec5;
  width: 70px;
  height: 60px;
  text-align: center;
  font-size: 1.1em;
  transition: background 0.5s, transform 0.3s, box-shadow 0.3s;
  position: relative;
}
th {
  background: var(--crimson);
  color: #fff;
  font-weight: 600;
}
td {
  transition: background 0.3s, box-shadow 0.3s;
}
td:hover {
  background: #ffe5e5;
  cursor: pointer;
  box-shadow: 0 0 0 2px var(--crimson, #A51C30);
  z-index: 1;
}
.highlight {
  background: var(--highlight) !important;
  font-weight: bold;
  color: var(--highlight-text);
  transform: scale(1.1);
  z-index: 2;
  box-shadow: var(--step-glow);
  animation: popin 0.6s;
}
.current-step {
  outline: 3px solid var(--crimson-dark);
  box-shadow: 0 0 12px 2px var(--crimson-dark);
  z-index: 3;
}
@keyframes popin {
  0% { transform: scale(0.7);}
  60% { transform: scale(1.2);}
  100% { transform: scale(1.1);}
}
.found {
  background: var(--found) !important;
  color: #fff;
  font-weight: bold;
  transform: scale(1.1);
  z-index: 2;
  box-shadow: 0 0 0 4px #22c55e55;
  animation: popin 0.6s;
}
.deleted {
  background: var(--deleted) !important;
  color: #fff;
  font-weight: bold;
  transform: scale(1.1);
  z-index: 2;
  box-shadow: 0 0 0 4px #ef444455;
  animation: popin 0.6s;
}
.inserted-indicator {
  position: absolute;
  top: 4px;
  right: 6px;
  font-size: 1.3em;
  color: var(--crimson);
  animation: fadein 0.8s;
  pointer-events: none;
  user-select: none;
}
.stats-panel {
  margin: 18px auto 0 auto;
  max-width: 600px;
  background: var(--info-bg);
  border: 1.5px solid var(--crimson);
  border-radius: 8px;
  padding: 12px 20px;
  color: var(--text-main);
  font-size: 1.05em;
  transition: background 0.3s, color 0.3s;
}
.probing-sequence {
  margin: 24px auto 0 auto;
  max-width: 700px;
  background: var(--bg);
  border: 1px solid var(--crimson);
  border-radius: 8px;
  padding: 10px 16px;
  color: var(--crimson);
  font-size: 1.05em;
  font-family: 'Merriweather', Georgia, serif;
  min-height: 32px;
  transition: background 0.3s, color 0.3s;
}
.step-controls {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 10px;
}
.step-btn {
  background: var(--crimson);
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 6px 14px;
  font-size: 1em;
  cursor: pointer;
  font-family: 'Merriweather', Georgia, serif;
  transition: background 0.2s;
}
.step-btn:disabled {
  background: #b0bec5;
  color: #fff;
  cursor: not-allowed;
}
.step-btn:hover:not(:disabled) {
  background: var(--crimson-dark);
}
.arrow-container {
  position: relative;
  height: 40px;
  margin-bottom: -20px;
  margin-top: -10px;
  pointer-events: none;
}
.arrow-svg {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 40px;
  z-index: 10;
  pointer-events: none;
}
.dot-container {
  position: relative;
  height: 40px;
  margin-bottom: -20px;
  margin-top: -10px;
  pointer-events: none;
  z-index: 20;
}
.dot {
  width: 18px;
  height: 18px;
  background: var(--gold);
  border-radius: 50%;
  position: absolute;
  z-index: 100;
  border: 2px solid var(--crimson);
  box-shadow: 0 0 8px 2px #ffc72c88;
  animation: dotmove 0.7s linear;
}
@keyframes dotmove {
  0% { opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { opacity: 0; }
}
@keyframes fadein {
  from { opacity: 0;}
  to { opacity: 1;}
}
@keyframes fadeout {
  from { opacity: 1;}
  to { opacity: 0;}
}
.pulse {
  animation: pulse 0.7s;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 var(--highlight); }
  70% { box-shadow: 0 0 0 10px rgba(255,199,44,0); }
  100% { box-shadow: 0 0 0 0 rgba(255,199,44,0); }
}
.shake {
  animation: shake 0.5s;
}
@keyframes shake {
  0% { transform: translateX(0);}
  20% { transform: translateX(-6px);}
  40% { transform: translateX(6px);}
  60% { transform: translateX(-4px);}
  80% { transform: translateX(4px);}
  100% { transform: translateX(0);}
}
.fadein {
  animation: fadein 0.5s;
}
.fadeout {
  animation: fadeout 0.5s;
}
.deleted-slot {
  background: repeating-linear-gradient(
    135deg,
    #ef4444 0px,
    #ef4444 8px,
    #fff8e1 8px,
    #fff8e1 16px
  ) !important;
  color: #fff !important;
  position: relative;
}
.deleted-slot::after {
  content: "✖";
  position: absolute;
  top: 8px;
  right: 8px;
  font-size: 1.2em;
  color: #fff;
  opacity: 0.7;
  pointer-events: none;
}
.tooltip {
  position: absolute;
  background: #232323;
  color: #fff;
  padding: 4px 10px;
  border-radius: 5px;
  font-size: 0.95em;
  z-index: 100;
  pointer-events: none;
  white-space: nowrap;
  opacity: 0.95;
  box-shadow: 0 2px 8px #0002;
}
.load-bar-container {
  width: 100%;
  max-width: 400px;
  margin: 18px auto 0 auto;
  height: 18px;
  background: #eee;
  border-radius: 8px;
  position: relative;
  box-shadow: 0 1px 4px #0001;
}
.load-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--gold), var(--crimson));
  border-radius: 8px;
  width: 0%;
  transition: width 0.7s cubic-bezier(.4,2,.6,1);
}
.load-bar-label {
  position: absolute;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
  color: var(--crimson-dark);
  font-weight: bold;
  font-size: 1em;
  line-height: 18px;
  pointer-events: none;
}
/* Operation History Panel */
.history-panel {
  background: var(--info-bg);
  border: 1px solid var(--crimson);
  border-radius: 8px;
  max-width: 600px;
  margin: 24px auto 0 auto;
  padding: 10px 16px 6px 16px;
  font-size: 0.97em;
  color: var(--text-main);
  box-shadow: 0 2px 8px #0001;
}
.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: bold;
  color: var(--crimson-dark);
  margin-bottom: 6px;
}
.history-header button {
  background: none;
  border: none;
  font-size: 1.1em;
  cursor: pointer;
  color: var(--crimson);
  transition: color 0.2s;
}
.history-header button:hover {
  color: var(--gold);
}
.history-log {
  max-height: 120px;
  overflow-y: auto;
  font-family: 'Merriweather', Georgia, serif;
  padding-right: 2px;
}
.history-entry {
  margin-bottom: 2px;
  border-left: 3px solid var(--crimson);
  padding-left: 8px;
  font-size: 0.97em;
  background: #fff9e7;
  border-radius: 3px;
}
.history-entry span {
  color: var(--crimson-dark);
  font-size: 0.93em;
  margin-right: 6px;
}

/* Share/Embed Panel */
.share-embed-panel {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin: 18px auto 0 auto;
  max-width: 600px;
}
.share-embed-panel button {
  background: var(--gold);
  color: var(--crimson);
  border: none;
  border-radius: 4px;
  padding: 5px 14px;
  font-size: 1em;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.share-embed-panel button:hover {
  background: var(--gold-dark);
}
.share-input {
  width: 70%;
  margin-left: 8px;
  padding: 5px 8px;
  font-size: 0.97em;
  border: 1px solid var(--crimson);
  border-radius: 4px;
  background: #fff;
  color: var(--crimson-dark);
}
@media (max-width: 900px) {
  .container { padding: 8px 2px; }
  table, th, td { font-size: 0.92em; }
  .info {
    font-size: 0.89em;
    padding: 6px 6px;
    margin-bottom: 10px;
  }
}
@media (max-width: 600px) {
  #hashTable, #sortedArrayTable { display: block; overflow-x: auto; }
  .stats-panel, .probing-sequence { font-size: 0.9em; }
}