:root {
  /* NEW: Refined Deep Blue Theme (Default/Light) */
  --bg: #f0f9ff;
  --bg-elevated: #ffffff;
  --bg-panel: #ffffff;
  --bg-panel-soft: #f8fafc;
  --accent: #0ea5e9; /* Sky Blue - bright accent */
  --accent-soft: rgba(14, 165, 233, 0.08);
  --accent-soft-strong: rgba(14, 165, 233, 0.12);
  --border-subtle: rgba(14, 165, 233, 0.12);
  --border-strong: rgba(14, 165, 233, 0.2);
  --text-main: #1e293b;
  --text-muted: #475569;
  --danger: #ef4444;
  --match: #059669; /* Teal/Torquish instead of Emerald */
  --trace: #38bdf8; /* Bright Sky - emphasis */
  --highlight: #1e40af; /* Deep Blue - sophisticated depth */
  --secondary: #f59e0b; /* Amber for secondary */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --radius-lg: 14px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --shadow-soft: 0 20px 40px rgba(14, 165, 233, 0.1);
  --transition-fast: 0.15s ease;
  --transition-med: 0.2s ease;
  --transition-slow: 0.3s ease;
  --glow-accent: 0 0 20px rgba(14, 165, 233, 0.15);
  --glow-match: 0 0 20px rgba(13, 148, 136, 0.15);
  --glow-trace: 0 0 20px rgba(56, 189, 248, 0.15);
  --glow-highlight: 0 0 20px rgba(30, 64, 175, 0.1);
}

[data-theme="dark"] {
  /* ORIGINAL HIGH-QUALITY DARK THEME - Restored */
  --bg: #020617;
  --bg-elevated: #020617;
  --bg-panel: #020617;
  --bg-panel-soft: #020617;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.08);
  --accent-soft-strong: rgba(56, 189, 248, 0.16);
  --border-subtle: rgba(148, 163, 184, 0.28);
  --border-strong: rgba(148, 163, 184, 0.6);
  --text-main: #e5e7eb;
  --text-muted: #9ca3af;
  --danger: #f97373;
  --match: #22c55e;
  --trace: #fbbf24;
  --highlight: #fbbf24;
  --secondary: #fbbf24;
  --shadow-soft: 0 20px 40px rgba(15, 23, 42, 0.75);
  --glow-accent: 0 0 20px rgba(56, 189, 248, 0.4);
  --glow-match: 0 0 20px rgba(34, 197, 94, 0.4);
  --glow-trace: 0 0 20px rgba(251, 191, 36, 0.4);
  --glow-highlight: 0 0 20px rgba(251, 191, 36, 0.6);
}

[data-theme="deep-blue"] {
  /* Alternative Deep Blue for dark mode */
  --bg: #0f172a;
  --bg-elevated: #1e293b;
  --bg-panel: #1e293b;
  --bg-panel-soft: #1e293b;
  --accent: #0ea5e9;
  --accent-soft: rgba(14, 165, 233, 0.1);
  --accent-soft-strong: rgba(14, 165, 233, 0.2);
  --border-subtle: rgba(100, 116, 139, 0.3);
  --border-strong: rgba(100, 116, 139, 0.5);
  --text-main: #e2e8f0;
  --text-muted: #94a3b8;
  --danger: #f87171;
  --match: #10b981;
  --trace: #38bdf8;
  --highlight: #1e40af;
  --secondary: #fbbf24;
  --glow-accent: 0 0 15px rgba(14, 165, 233, 0.4);
  --glow-match: 0 0 15px rgba(16, 185, 129, 0.3);
  --glow-trace: 0 0 15px rgba(56, 189, 248, 0.4);
  --glow-highlight: 0 0 15px rgba(30, 64, 175, 0.4);
  --shadow-soft: 0 20px 40px rgba(15, 23, 42, 0.85);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  color: var(--text-main);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

[data-theme="dark"] body {
  background: radial-gradient(circle at 0% 0%, #0f172a, #020617 55%);
}

[data-theme="deep-blue"] body {
  background: radial-gradient(ellipse at top left, #1e293b, #0f172a 70%);
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0;
}

.app-shell {
  width: 100vw;
  height: 100vh;
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  overflow: hidden;
  transition: background var(--transition-slow);
}

[data-theme="dark"] .app-shell {
  background: radial-gradient(circle at 10% 0%, #020617, #000 60%);
}

[data-theme="deep-blue"] .app-shell {
  background: radial-gradient(ellipse at 10% 0%, #1e293b, #0f172a 60%);
}

.app-shell::before {
  content: "";
  position: absolute;
  inset: -120px;
  background:
    radial-gradient(circle at 0% 0%, rgba(14, 165, 233, 0.05), transparent 60%),
    radial-gradient(circle at 100% 100%, rgba(30, 64, 175, 0.05), transparent 60%);
  opacity: 0.6;
  pointer-events: none;
  z-index: 0;
  transition: all var(--transition-slow);
}

[data-theme="dark"] .app-shell::before {
  background:
    radial-gradient(circle at 0% 0%, rgba(56, 189, 248, 0.06), transparent 60%),
    radial-gradient(circle at 100% 100%, rgba(251, 191, 36, 0.06), transparent 60%);
  opacity: 0.9;
}

[data-theme="deep-blue"] .app-shell::before {
  background:
    radial-gradient(circle at 0% 0%, rgba(14, 165, 233, 0.08), transparent 60%),
    radial-gradient(circle at 100% 100%, rgba(30, 64, 175, 0.08), transparent 60%);
  opacity: 0.7;
}

.app-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  overflow: hidden;
}

header.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 0 4px;
  flex-shrink: 0;
}

.title-block {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.title-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.app-title {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.03em;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--highlight), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}


.app-title i {
  font-size: 19px;
  background: linear-gradient(135deg, var(--highlight), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 10px rgba(14, 165, 233, 0.15);
  transition: transform var(--transition-fast);
}

.app-title:hover i {
  transform: rotate(15deg);
}

.title-text {
  text-shadow: 0 0 10px rgba(14, 165, 233, 0.1);
}


[data-theme="dark"] .app-title {
  background: linear-gradient(135deg, var(--highlight), #fde68a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 10px rgba(251, 191, 36, 0.3);
}

[data-theme="dark"] .app-title i {
  background: linear-gradient(135deg, var(--highlight), #fde68a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 10px rgba(251, 191, 36, 0.3);
}

[data-theme="deep-blue"] .app-title {
  background: linear-gradient(135deg, var(--trace), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 10px rgba(56, 189, 248, 0.2);
}

[data-theme="deep-blue"] .app-title i {
  background: linear-gradient(135deg, var(--trace), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 10px rgba(56, 189, 248, 0.2);
}

[data-theme="dark"] .title-text {
  text-shadow: 0 0 10px rgba(251, 191, 36, 0.3);
}

[data-theme="deep-blue"] .title-text {
  text-shadow: 0 0 10px rgba(56, 189, 248, 0.2);
}

.app-title-pill {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid rgba(14, 165, 233, 0.2);
  background: rgba(14, 165, 233, 0.08);
  color: var(--accent);
  transition: all var(--transition-med);
  box-shadow: 0 0 8px rgba(14, 165, 233, 0.15);
}

.app-title-pill:hover {
  border-color: var(--accent);
  background: rgba(14, 165, 233, 0.12);
  box-shadow: 0 0 12px rgba(14, 165, 233, 0.2);
}

[data-theme="dark"] .app-title-pill {
  border: 1px solid rgba(251, 191, 36, 0.3);
  background: rgba(251, 191, 36, 0.1);
  color: var(--highlight);
  box-shadow: 0 0 8px rgba(251, 191, 36, 0.2);
}

[data-theme="dark"] .app-title-pill:hover {
  border-color: var(--highlight);
  background: rgba(251, 191, 36, 0.15);
  box-shadow: 0 0 12px rgba(251, 191, 36, 0.3);
}

[data-theme="deep-blue"] .app-title-pill {
  font-size: 10px;
  padding: 3px 8px;
  border: 1px solid rgba(56, 189, 248, 0.3);
  background: rgba(56, 189, 248, 0.1);
  color: var(--trace);
  box-shadow: 0 0 8px rgba(56, 189, 248, 0.2);
}

[data-theme="deep-blue"] .app-title-pill:hover {
  border-color: var(--trace);
  background: rgba(56, 189, 248, 0.15);
  box-shadow: 0 0 12px rgba(56, 192, 248, 0.3);
}

.title-sub {
  font-size: 12px;
  color: var(--text-muted);
}

[data-theme="dark"] .title-sub {
  font-size: 12px;
}

[data-theme="deep-blue"] .title-sub {
  font-size: 12px;
  color: #94a3b8;
}

.header-right {
  display: flex;
  gap: 10px;
  align-items: center;
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  transition: all var(--transition-med);
  position: relative;
  overflow: hidden;
}

.theme-toggle::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.6s;
}

.theme-toggle:hover::before {
  left: 100%;
}

.theme-toggle:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--glow-accent);
}

[data-theme="dark"] .theme-toggle:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px var(--glow-accent);
}

.theme-toggle-icon {
  font-size: 12px;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
  width: 16px;
  text-align: center;
}

.theme-toggle:hover .theme-toggle-icon {
  transform: rotate(30deg);
  color: var(--accent);
}

.theme-toggle-text {
  font-size: 10px;
  color: var(--text-muted);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.theme-toggle:hover .theme-toggle-text {
  color: var(--accent);
}

/* Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-slow);
  backdrop-filter: blur(8px);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-panel);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  width: 90%;
  max-width: 500px;
  box-shadow: var(--shadow-soft);
  transform: translateY(20px);
  transition: transform var(--transition-slow);
  overflow: hidden;
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  margin: 0;
  font-size: 17px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 24px;
  cursor: pointer;
  padding: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.modal-body {
  padding: 20px;
}

.mode-option {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 15px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  margin-bottom: 12px;
  cursor: pointer;
  transition: all var(--transition-med);
}

.mode-option:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.15);
}

.mode-option:last-child {
  margin-bottom: 0;
}

.mode-icon {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--accent);
  flex-shrink: 0;
  transition: all var(--transition-med);
}

.mode-option:hover .mode-icon {
  background: var(--accent);
  color: white;
  transform: scale(1.1);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.5);
}

.mode-info {
  flex: 1;
}

.mode-info h4 {
  margin: 0 0 5px 0;
  color: var(--text-main);
  font-size: 16px;
}

.mode-info p {
  margin: 0;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.4;
}

.modal-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.modal-btn {
  padding: 9px 17px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  color: var(--text-main);
  font-size: 13px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-1px);
}

.modal-btn.secondary {
  background: transparent;
  border-color: transparent;
}

.modal-btn.secondary:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.layout {
  display: grid;
  grid-template-columns: 382px 1fr;
  gap: 10px;
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

.panel {
  border-radius: var(--radius-lg);
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  transition: all var(--transition-med);
  position: relative;
}

[data-theme="dark"] .panel {
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--border-subtle);
}

[data-theme="deep-blue"] .panel {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.3);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}

.panel::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-med);
}

.panel:hover::after {
  opacity: 0.6;
}

.panel:hover {
  box-shadow: 0 12px 35px rgba(14, 165, 233, 0.15);
  border-color: rgba(14, 165, 233, 0.2);
  transform: translateY(-1px);
}

[data-theme="dark"] .panel:hover {
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.85), 0 0 30px rgba(56, 189, 248, 0.15);
  border-color: rgba(56, 189, 248, 0.3);
}

[data-theme="deep-blue"] .panel:hover {
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 0 0 25px rgba(14, 165, 233, 0.15);
  border-color: rgba(14, 165, 233, 0.3);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.panel-title {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

[data-theme="dark"] .panel-title {
  font-size: 12px;
}

[data-theme="deep-blue"] .panel-title {
  font-size: 12px;
  color: #94a3b8;
}

.panel-subtitle {
  font-size: 11px;
  color: var(--text-muted);
}

[data-theme="dark"] .panel-subtitle {
  font-size: 11px;
}

[data-theme="deep-blue"] .panel-subtitle {
  font-size: 11px;
  color: #94a3b8;
}

/* Algorithm selector */
.algorithm-selector {
  display: flex;
  gap: 4px;
  background: var(--bg-panel-soft);
  border-radius: var(--radius-md);
  padding: 2px;
  border: 1px solid var(--border-subtle);
  margin-top: 4px;
}

.algo-tab {
  flex: 1;
  padding: 6px 9px;
  text-align: center;
  font-size: 10px;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.algo-tab:hover {
  background: rgba(14, 165, 233, 0.08);
  color: var(--accent);
  border-color: rgba(14, 165, 233, 0.2);
  box-shadow: 0 0 8px rgba(14, 165, 233, 0.1);
}

.algo-tab.active {
  background: rgba(14, 165, 233, 0.12);
  color: var(--accent);
  border-color: rgba(14, 165, 233, 0.3);
  box-shadow: 0 0 0 1px rgba(14, 165, 233, 0.15), 0 0 12px rgba(14, 165, 233, 0.1);
}

[data-theme="dark"] .algo-tab:hover {
  background: rgba(251, 191, 36, 0.1);
  color: var(--highlight);
  border-color: rgba(251, 191, 36, 0.3);
  box-shadow: 0 0 10px rgba(251, 191, 36, 0.2);
}

[data-theme="dark"] .algo-tab.active {
  background: rgba(251, 191, 36, 0.15);
  color: var(--highlight);
  border-color: rgba(251, 191, 36, 0.5);
  box-shadow: 0 0 0 1px rgba(251, 191, 36, 0.2), 0 0 15px rgba(251, 191, 36, 0.2);
}

[data-theme="deep-blue"] .algo-tab:hover {
  background: rgba(56, 189, 248, 0.1);
  color: var(--trace);
  border-color: rgba(56, 189, 248, 0.3);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.2);
}

[data-theme="deep-blue"] .algo-tab.active {
  background: rgba(56, 189, 248, 0.15);
  color: var(--trace);
  border-color: rgba(56, 189, 248, 0.5);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.2), 0 0 15px rgba(56, 189, 248, 0.2);
}

.algo-info {
  font-size: 10px;
  color: var(--text-muted);
  padding: 5px 7px;
  border-radius: var(--radius-sm);
  background: var(--bg-panel-soft);
  margin-top: 2px;
  border-left: 2px solid var(--accent);
  transition: all var(--transition-med);
  display: flex;
  align-items: flex-start;
  gap: 5px;
  line-height: 1.4;
}

[data-theme="dark"] .algo-info {
  border-left: 2px solid var(--highlight);
}

[data-theme="deep-blue"] .algo-info {
  border-left: 2px solid var(--trace);
  color: #94a3b8;
}

/* Inputs + controls */
.inputs-group {
  display: flex;
  flex-direction: column;
  gap: 0px;
  flex-shrink: 0;
}

.input-row {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

label {
  font-size: 11px;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  gap: 5px;
  align-items: baseline;
}

label span.key {
  font-family: "SF Mono", ui-monospace, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 11px;
  color: var(--accent);
}

input[type="text"] {
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  color: var(--text-main);
  padding: 7px 9px;
  font-size: 13px;
  outline: none;
  width: 100%;
  transition: all var(--transition-fast);
}

[data-theme="dark"] input[type="text"] {
  background: var(--bg-panel-soft);
  border-color: var(--border-subtle);
  color: var(--text-main);
}

[data-theme="deep-blue"] input[type="text"] {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.4);
  color: #e2e8f0;
}

input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(14, 165, 233, 0.2), var(--glow-accent);
  background: var(--bg-elevated);
  transform: translateY(-0.5px);
}

[data-theme="dark"] input[type="text"]:focus {
  border-color: var(--highlight);
  box-shadow: 0 0 0 1px rgba(251, 191, 36, 0.3), var(--glow-highlight);
  background: var(--bg-elevated);
}

[data-theme="deep-blue"] input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(14, 165, 233, 0.3), var(--glow-accent);
  background: #1e293b;
}

.hint-text {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 1px;
  display: flex;
  align-items: center;
  gap: 5px;
}
.preset-label {
  /* ... existing styles ... */
  margin-top: 2px;    /* Reduced from 12px */
  margin-bottom: 2px; /* Reduced from 8px */
}


.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 2px;
  margin-bottom: 6px;
}

.chip {
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  padding: 3px 8px;
  font-size: 10px;
  color: var(--text-muted);
  cursor: pointer;
  background: var(--bg-panel-soft);
  transition: all var(--transition-fast);
  user-select: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  position: relative;
}

[data-theme="dark"] .chip {
  font-size: 10px;
  padding: 3px 8px;
}

[data-theme="deep-blue"] .chip {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.4);
  color: #94a3b8;
}

.chip:hover {
  background: rgba(14, 165, 233, 0.1);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-0.5px);
  box-shadow: 0 4px 8px rgba(14, 165, 233, 0.2);
}

[data-theme="dark"] .chip:hover {
  background: rgba(56, 189, 248, 0.1);
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 4px 8px rgba(56, 189, 248, 0.2);
}

[data-theme="deep-blue"] .chip:hover {
  background: rgba(14, 165, 233, 0.1);
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 4px 8px rgba(14, 165, 233, 0.2);
}

/* Controls Container */
.controls-container {
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  padding: 10px;
  margin-top: 5px;
  transition: all var(--transition-med);
  position: relative;
}

[data-theme="dark"] .controls-container {
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  box-shadow: var(--shadow-soft);
}

[data-theme="deep-blue"] .controls-container {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.3);
}

.controls-container:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 24px rgba(14, 165, 233, 0.15);
}

[data-theme="dark"] .controls-container:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 24px rgba(56, 189, 248, 0.15);
}

[data-theme="deep-blue"] .controls-container:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 24px rgba(14, 165, 233, 0.15);
}

.controls-container::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-med);
}

.controls-container:hover::after {
  opacity: 0.5;
}

/* Buttons */
.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.controls-compact {
  display: flex;
  align-items: center;
  gap: 4px;
  width: 100%;
}

.controls-compact button {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.control-btn {
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  color: var(--text-main);
  font-size: 11px;
  padding: 7px 9px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all var(--transition-fast);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

[data-theme="dark"] .control-btn {
  font-size: 11px;
  padding: 7px 9px;
}

[data-theme="deep-blue"] .control-btn {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.4);
  color: #e2e8f0;
}

.control-btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.5s;
}

.control-btn:hover::before {
  left: 100%;
}

.control-btn:hover {
  transform: translateY(-0.5px);
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(14, 165, 233, 0.15);
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.15);
}

[data-theme="dark"] .control-btn:hover {
  transform: translateY(-0.5px);
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(56, 189, 248, 0.15);
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.2);
}

[data-theme="deep-blue"] .control-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(14, 165, 233, 0.2);
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.2), 0 0 20px rgba(14, 165, 233, 0.1);
}

.control-btn:active {
  transform: translateY(0);
}

.control-btn:disabled {
  opacity: 0.4;
  cursor: default;
  transform: none;
  box-shadow: none;
}

.control-btn:disabled::before {
  display: none;
}

.control-btn.primary {
  border-color: var(--accent);
  background: rgba(14, 165, 233, 0.1);
  flex: 2;
}

[data-theme="dark"] .control-btn.primary {
  border-color: var(--accent);
  background: rgba(56, 189, 248, 0.12);
}

[data-theme="deep-blue"] .control-btn.primary {
  border-color: var(--accent);
  background: rgba(14, 165, 233, 0.15);
}

.control-btn.primary:hover {
  background: rgba(14, 165, 233, 0.18);
  border-color: var(--accent);
  box-shadow: 0 4px 15px rgba(14, 165, 233, 0.2);
}

[data-theme="dark"] .control-btn.primary:hover {
  background: rgba(56, 189, 248, 0.22);
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3);
}

[data-theme="deep-blue"] .control-btn.primary:hover {
  border-color: var(--accent);
  background: rgba(14, 165, 233, 0.25);
  box-shadow: 0 4px 15px rgba(14, 165, 233, 0.3), 0 0 25px rgba(14, 165, 233, 0.15);
}

.controls-row .spacer {
  flex: 1;
}

.icon-dot {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 11px rgba(14, 165, 233, 0.5);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { opacity: 0.7; box-shadow: 0 0 0 0 rgba(14, 165, 233, 0.5); }
  50% { opacity: 1; box-shadow: 0 0 0 6px rgba(14, 165, 233, 0); }
  100% { opacity: 0.7; box-shadow: 0 0 0 0 rgba(14, 165, 233, 0); }
}

[data-theme="dark"] .icon-dot {
  background: var(--highlight);
  box-shadow: 0 0 11px rgba(251, 191, 36, 0.9);
  animation: pulse-dark 2s infinite;
}

[data-theme="deep-blue"] .icon-dot {
  background: var(--accent);
  box-shadow: 0 0 11px rgba(14, 165, 233, 0.7);
  animation: pulse-deep-blue 2s infinite;
}

@keyframes pulse-dark {
  0% { opacity: 0.7; box-shadow: 0 0 0 0 rgba(251, 191, 36, 0.7); }
  50% { opacity: 1; box-shadow: 0 0 0 6px rgba(251, 191, 36, 0); }
  100% { opacity: 0.7; box-shadow: 0 0 0 0 rgba(251, 191, 36, 0); }
}

@keyframes pulse-deep-blue {
  0% { opacity: 0.7; box-shadow: 0 0 0 0 rgba(14, 165, 233, 0.7); }
  50% { opacity: 1; box-shadow: 0 0 0 6px rgba(14, 165, 233, 0); }
  100% { opacity: 0.7; box-shadow: 0 0 0 0 rgba(14, 165, 233, 0); }
}

/* FIXED: Speed Slider - Correct Direction */
.premium-slider {
  --slider-height: 6px;
  --thumb-size: 20px;
  margin-top: 12px;
}

.slider-container {
  position: relative;
  padding: 12px 0;
  height: 40px;
  width: 100%;
}

.premium-slider-track {
  width: 100%;
  height: var(--slider-height);
  background: var(--border-subtle);
  border-radius: var(--radius-sm);
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  overflow: hidden;
}

.premium-slider-fill {
  height: 100%;
  background: linear-gradient(90deg, 
    var(--accent),  /* Left: Slow (blue/accent) */
    var(--trace)    /* Right: Fast (cyan/trace) */
  );
  border-radius: var(--radius-sm);
  width: 8.75%; /* Start at 175ms (8.75% of 2000ms range) */
  transition: width 0.1s ease;
  position: absolute;
  left: 0;
  top: 0;
}

[data-theme="dark"] .premium-slider-fill {
  background: linear-gradient(90deg, 
    var(--highlight),  /* Left: Slow (yellow) */
    var(--trace)       /* Right: Fast (yellow-trace) */
  );
}

[data-theme="deep-blue"] .premium-slider-fill {
  background: linear-gradient(90deg, 
    var(--accent),  /* Left: Slow (blue) */
    var(--trace)    /* Right: Fast (cyan) */
  );
}

.premium-slider-input {
  width: 100%;
  height: 40px;
  margin: 0;
  opacity: 0;
  cursor: pointer;
  position: relative;
  z-index: 2;
  -webkit-appearance: none;
}

.premium-slider-thumb {
  width: var(--thumb-size);
  height: var(--thumb-size);
  background: var(--bg-elevated);
  border-radius: 50%;
  position: absolute;
  top: 50%;
  left: 8.75%; /* Start at 175ms position */
  transform: translate(-50%, -50%);
  box-shadow: 
    0 2px 8px rgba(0, 0, 0, 0.1),
    0 0 0 2px var(--accent),
    0 0 12px rgba(14, 165, 233, 0.2);
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1;
  pointer-events: none;
  border: 2px solid var(--bg-panel);
  display: flex;
  align-items: center;
  justify-content: center;
}

[data-theme="dark"] .premium-slider-thumb {
  box-shadow: 
    0 2px 8px rgba(0, 0, 0, 0.2),
    0 0 0 2px var(--highlight),
    0 0 15px rgba(251, 191, 36, 0.3);
  border: 2px solid var(--bg-panel);
}

[data-theme="deep-blue"] .premium-slider-thumb {
  box-shadow: 
    0 2px 8px rgba(0, 0, 0, 0.2),
    0 0 0 2px var(--accent),
    0 0 15px rgba(14, 165, 233, 0.3);
  border: 2px solid var(--bg-panel);
}

.premium-slider-thumb::before {
  content: '';
  width: 4px;
  height: 4px;
  background: var(--accent);
  border-radius: 50%;
  transition: all 0.2s ease;
}

[data-theme="dark"] .premium-slider-thumb::before {
  background: var(--highlight);
}

.premium-slider-thumb:hover {
  transform: translate(-50%, -50%) scale(1.15);
  box-shadow: 
    0 3px 12px rgba(0, 0, 0, 0.15),
    0 0 0 3px var(--accent),
    0 0 18px rgba(14, 165, 233, 0.3);
}

[data-theme="dark"] .premium-slider-thumb:hover {
  box-shadow: 
    0 3px 12px rgba(0, 0, 0, 0.25),
    0 0 0 3px var(--highlight),
    0 0 20px rgba(251, 191, 36, 0.5);
}

[data-theme="deep-blue"] .premium-slider-thumb:hover {
  box-shadow: 
    0 3px 12px rgba(0, 0, 0, 0.25),
    0 0 0 3px var(--accent),
    0 0 20px rgba(14, 165, 233, 0.5);
}

.premium-slider-thumb.active {
  transform: translate(-50%, -50%) scale(1.2);
  box-shadow: 
    0 0 0 3px var(--accent),
    0 0 25px rgba(14, 165, 233, 0.4);
}

[data-theme="dark"] .premium-slider-thumb.active {
  box-shadow: 
    0 0 0 3px var(--highlight),
    0 0 25px rgba(251, 191, 36, 0.6);
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 4px;
  font-size: 9px;
  color: var(--text-muted);
}

.slider-label {
  position: relative;
  padding: 2px 4px;
  border-radius: 3px;
  opacity: 0.7;
  font-weight: 500;
}

.slider-label.slow {
  color: var(--accent);
}

.slider-label.fast {
  color: var(--trace);
}

[data-theme="dark"] .slider-label.slow {
  color: var(--highlight);
}

[data-theme="dark"] .slider-label.fast {
  color: var(--trace);
}

[data-theme="deep-blue"] .slider-label.fast {
  color: var(--trace);
}

.speed-display {
  text-align: center;
  font-size: 10px;
  color: var(--accent);
  font-weight: 500;
  margin-top: 2px;
  font-family: "SF Mono", ui-monospace, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  background: var(--accent-soft);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin: 4px auto 0;
  border: 1px solid var(--border-subtle);
}

[data-theme="dark"] .speed-display {
  color: var(--highlight);
  background: rgba(251, 191, 36, 0.1);
  border: 1px solid rgba(251, 191, 36, 0.2);
}

/* Light theme adjustments for slider */
[data-theme="light"] .premium-slider-track {
  background: rgba(14, 165, 233, 0.1);
}

[data-theme="deep-blue"] .premium-slider-track {
  background: rgba(100, 116, 139, 0.15);
}

/* Stats card */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  margin-top: 10px;
}

.stat-card {
  border-radius: var(--radius-md);
  padding: 7px 8px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  display: flex;
  flex-direction: column;
  gap: 3px;
  transition: all var(--transition-med);
  position: relative;
  overflow: hidden;
}

[data-theme="dark"] .stat-card {
  background: var(--bg-panel-soft);
  border-color: var(--border-subtle);
}

[data-theme="deep-blue"] .stat-card {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.4);
}

.stat-card:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.15);
}

[data-theme="dark"] .stat-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.2);
}

[data-theme="deep-blue"] .stat-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.2);
}

.stat-label {
  font-size: 10px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 5px;
}

.stat-value {
  font-size: 12px;
  font-weight: 500;
}

.stat-badge {
  font-size: 10px;
  color: var(--accent);
}

[data-theme="dark"] .stat-badge {
  color: var(--highlight);
}

/* Explanation */
.explanation-box {
  margin-top: 8px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  padding: 7px 8px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  transition: all var(--transition-med);
}

[data-theme="dark"] .explanation-box {
  background: var(--bg-panel-soft);
  border-color: var(--border-subtle);
}

[data-theme="deep-blue"] .explanation-box {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.4);
}

.explanation-box:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.15);
}

[data-theme="dark"] .explanation-box:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.2);
}

[data-theme="deep-blue"] .explanation-box:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.2);
}

.explanation-title {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

[data-theme="dark"] .explanation-title {
  font-size: 11px;
}

[data-theme="deep-blue"] .explanation-title {
  font-size: 11px;
  color: #94a3b8;
}

.explanation-title span {
  display: flex;
  align-items: center;
  gap: 7px;
}

#explanation-text {
  font-size: 14px;
  color: var(--text-main);
  line-height: 1.4;
  flex: 1;
  overflow-y: auto;
}

[data-theme="dark"] #explanation-text {
  font-size: 12px;
  line-height: 1.5;
}

[data-theme="deep-blue"] #explanation-text {
  font-size: 12px;
  color: #e2e8f0;
  line-height: 1.5;
}

.lcs-output-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 6px;
  margin-top: 2px;
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.lcs-output-row div {
  display: flex;
  align-items: center;
  gap: 5px;
}

#lcs-string {
  font-family: "SF Mono", ui-monospace, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 12px;
  color: var(--accent);
  word-break: break-all;
  padding: 3px 7px;
  border-radius: var(--radius-sm);
  background: rgba(14, 165, 233, 0.08);
  transition: all var(--transition-fast);
  border: 1px solid rgba(14, 165, 233, 0.15);
}

[data-theme="dark"] #lcs-string {
  color: var(--highlight);
  background: rgba(251, 191, 36, 0.1);
  border: 1px solid rgba(251, 191, 36, 0.2);
}

[data-theme="deep-blue"] #lcs-string {
  color: var(--trace);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
}

#lcs-string:hover {
  box-shadow: var(--glow-accent);
  border-color: rgba(14, 165, 233, 0.3);
}

[data-theme="dark"] #lcs-string:hover {
  box-shadow: var(--glow-highlight);
  border-color: rgba(251, 191, 36, 0.4);
}

[data-theme="deep-blue"] #lcs-string:hover {
  box-shadow: var(--glow-trace);
  border-color: rgba(56, 189, 248, 0.4);
}

.pill {
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  padding: 3px 7px;
  font-size: 10px;
  color: var(--text-muted);
}

/* Right panel: visualization */
.right-panel-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

/* Visual comparison section */
.visual-comparison {
  border-radius: var(--radius-md);
  padding: 9px 11px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  display: flex;
  flex-direction: column;
  gap: 7px;
  flex-shrink: 0;
  transition: all var(--transition-med);
}

[data-theme="dark"] .visual-comparison {
  background: var(--bg-panel-soft);
  border-color: var(--border-subtle);
}

[data-theme="deep-blue"] .visual-comparison {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.4);
}

.visual-comparison:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.15);
}

[data-theme="dark"] .visual-comparison:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.2);
}

[data-theme="deep-blue"] .visual-comparison:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.2);
}

.comparison-title {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

[data-theme="dark"] .comparison-title {
  font-size: 11px;
}

[data-theme="deep-blue"] .comparison-title {
  font-size: 11px;
  color: #94a3b8;
}

.comparison-title span {
  display: flex;
  align-items: center;
  gap: 7px;
}

.comparison-strings {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.string-display {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.string-label {
  font-size: 10px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

[data-theme="deep-blue"] .string-label {
  color: #94a3b8;
}

.string-label span {
  display: flex;
  align-items: center;
  gap: 5px;
}

.string-chars {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

/* Character Boxes */
.char-box {
  min-width: 34px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  font-family: "SF Mono", ui-monospace, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 14px;
  position: relative;
  transition: all var(--transition-med);
}

[data-theme="dark"] .char-box {
  font-size: 14px;
}

[data-theme="deep-blue"] .char-box {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.4);
  font-size: 14px;
}

.char-box:hover {
  transform: translateY(-2px) scale(1.05);
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1), 0 0 15px rgba(14, 165, 233, 0.2);
}

[data-theme="dark"] .char-box:hover {
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15), 0 0 15px rgba(251, 191, 36, 0.3);
}

[data-theme="deep-blue"] .char-box:hover {
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2), 0 0 15px rgba(14, 165, 233, 0.3);
}

/* FIXED: Index Label Spacing */
.char-box-index {
  position: absolute;
  top: -6px;
  right: -6px;
  font-size: 9px;
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  border-radius: 999px;
  padding: 1px 5px;
  color: var(--text-muted);
  font-weight: 600;
  min-width: 18px;
  text-align: center;
  z-index: 1;
  line-height: 1;
}

[data-theme="dark"] .char-box-index {
  background: var(--bg-panel);
  border-color: var(--border-subtle);
}

[data-theme="deep-blue"] .char-box-index {
  background: #1e293b;
  color: #94a3b8;
}

.char-box-current-a {
  border-color: var(--accent);
  background: var(--accent-soft-strong);
  transform: translateY(-2px);
  animation: pulse-accent 1.5s infinite;
}

[data-theme="dark"] .char-box-current-a {
  border-color: var(--accent);
  background: var(--accent-soft-strong);
  animation: pulse-accent-dark 1.5s infinite;
}

/* FIXED: Yellow for char-box-current-b */
.char-box-current-b {
  border-color: var(--secondary);
  background: rgba(245, 158, 11, 0.16);
  transform: translateY(-2px);
  animation: pulse-secondary-yellow 1.5s infinite;
}

[data-theme="dark"] .char-box-current-b {
  border-color: var(--secondary);
  background: rgba(251, 191, 36, 0.16);
  animation: pulse-secondary-yellow 1.5s infinite;
}

.char-box-match {
  border-color: var(--match);
  background: rgba(5, 150, 105, 0.2);  /* Changed from rgba(13, 148, 136, 0.14) */
  animation: pulse-match 2s infinite;
}


[data-theme="dark"] .char-box-match {
  border-color: var(--match);
  background: rgba(34, 197, 94, 0.14);
  animation: pulse-match-dark 2s infinite;
}

[data-theme="deep-blue"] .char-box-match {
  border-color: #10b981;
  background: rgba(16, 185, 129, 0.14);
}

.char-box-in-lcs {
  border-color: var(--trace);
  background: rgba(56, 189, 248, 0.15);
  animation: pulse-trace 2s infinite;
}

[data-theme="dark"] .char-box-in-lcs {
  border-color: var(--trace);
  background: rgba(251, 191, 36, 0.15);
  animation: pulse-trace-dark 2s infinite;
}

[data-theme="deep-blue"] .char-box-in-lcs {
  border-color: var(--trace);
  background: rgba(56, 189, 248, 0.15);
  animation: pulse-trace-deep-blue 2s infinite;
}

@keyframes pulse-accent {
  0% { box-shadow: 0 0 0 0 rgba(14, 165, 233, 0.4); }
  70% { box-shadow: 0 0 0 8px rgba(14, 165, 233, 0); }
  100% { box-shadow: 0 0 0 0 rgba(14, 165, 233, 0); }
}

@keyframes pulse-accent-dark {
  0% { box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.4); }
  70% { box-shadow: 0 0 0 8px rgba(56, 189, 248, 0); }
  100% { box-shadow: 0 0 0 0 rgba(56, 189, 248, 0); }
}

/* Yellow pulse animation for char-box-current-b */
@keyframes pulse-secondary-yellow {
  0% { box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.4); }
  70% { box-shadow: 0 0 0 8px rgba(245, 158, 11, 0); }
  100% { box-shadow: 0 0 0 0 rgba(245, 158, 11, 0); }
}

@keyframes pulse-match {
  0% { box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.4); }  /* Changed from rgba(13, 148, 136, 0.4) */
  70% { box-shadow: 0 0 0 8px rgba(5, 150, 105, 0); }  /* Changed from rgba(13, 148, 136, 0) */
  100% { box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.4); }  /* Changed from rgba(13, 148, 136, 0.4) */
}

@keyframes pulse-match-dark {
  0% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4); }
  70% { box-shadow: 0 0 0 8px rgba(34, 197, 94, 0); }
  100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
}

@keyframes pulse-trace {
  0% { 
    box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.4), 0 4px 12px rgba(0, 0, 0, 0.1);
  }
  70% { 
    box-shadow: 0 0 0 8px rgba(56, 189, 248, 0), 0 4px 12px rgba(0, 0, 0, 0.1);
  }
  100% { 
    box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.4), 0 4px 12px rgba(0, 0, 0, 0.1);
  }
}

@keyframes pulse-trace-dark {
  0% { 
    box-shadow: 0 0 0 0 rgba(251, 191, 36, 0.4), 0 4px 12px rgba(0, 0, 0, 0.2);
  }
  70% { 
    box-shadow: 0 0 0 8px rgba(251, 191, 36, 0), 0 4px 12px rgba(0, 0, 0, 0.2);
  }
  100% { 
    box-shadow: 0 0 0 0 rgba(251, 191, 36, 0.4), 0 4px 12px rgba(0, 0, 0, 0.2);
  }
}

@keyframes pulse-trace-deep-blue {
  0% { 
    box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.4), 0 4px 12px rgba(0, 0, 0, 0.2);
  }
  70% { 
    box-shadow: 0 0 0 8px rgba(56, 189, 248, 0), 0 4px 12px rgba(0, 0, 0, 0.2);
  }
  100% { 
    box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.4), 0 4px 12px rgba(0, 0, 0, 0.2);
  }
}

@keyframes pulse-trace-yellow {
  0% { 
    box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.4), 0 4px 12px rgba(0, 0, 0, 0.1);
  }
  70% { 
    box-shadow: 0 0 0 8px rgba(245, 158, 11, 0), 0 4px 12px rgba(0, 0, 0, 0.1);
  }
  100% { 
    box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.4), 0 4px 12px rgba(0, 0, 0, 0.1);
  }
}

.comparison-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--accent);
  opacity: 0;
  transition: opacity var(--transition-med);
  min-height: 20px;
  font-weight: 500;
  gap: 7px;
}

[data-theme="dark"] .comparison-arrow {
  color: var(--accent);
}

.comparison-arrow.visible {
  opacity: 1;
  animation: fadeInUp 0.3s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* DP table area */
.dp-wrapper {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel);
  padding: 9px;
  display: flex;
  flex-direction: column;
  gap: 9px;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

[data-theme="dark"] .dp-wrapper {
  background: var(--bg-panel);
  border-color: var(--border-subtle);
}

[data-theme="deep-blue"] .dp-wrapper {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.4);
}

.dp-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
  gap: 9px;
}

#dp-table-title {
  display: flex;
  align-items: center;
  gap: 7px;
}

.dp-visualization-area {
  display: flex;
  flex-direction: row;
  gap: 13px;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}


.dp-table-section {
  flex: 2;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.dp-table-container {
  border-radius: var(--radius-md);
  border: 1px solid var(--border-strong);
  background: var(--bg-panel-soft);
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  transition: all var(--transition-med);
}

[data-theme="dark"] .dp-table-container {
  background: var(--bg-panel-soft);
  border-color: var(--border-strong);
}

[data-theme="deep-blue"] .dp-table-container {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.5);
}

.dp-table-container:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(14, 165, 233, 0.15);
}

[data-theme="dark"] .dp-table-container:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.15);
}

[data-theme="deep-blue"] .dp-table-container:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(14, 165, 233, 0.15);
}

.dp-table-scroll {
  overflow: auto;
  padding: 6px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-subtle) transparent;
  height: 100%;
  flex: 1;
  min-height: 200px;
}

.dp-table-scroll::-webkit-scrollbar {
  height: 5px;
  width: 5px;
}

.dp-table-scroll::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: 999px;
}

.legend-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 10px;
  margin-top: 5px;
}

.legend-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 6px;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  transition: all var(--transition-fast);
}

[data-theme="dark"] .legend-chip {
  background: var(--bg-panel-soft);
  border-color: var(--border-subtle);
}

[data-theme="deep-blue"] .legend-chip {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.4);
}

.legend-chip:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

[data-theme="dark"] .legend-chip:hover {
  border-color: var(--highlight);
}

.legend-color {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.legend-color.match {
  background: var(--match);
  opacity: 0.8;  /* Changed from 0.7 for more visibility */
}


[data-theme="dark"] .legend-color.match {
  background: var(--match);
}

[data-theme="deep-blue"] .legend-color.match {
  background: #10b981;
}

.legend-chip:hover .legend-color.match {
  animation: pulse-match 1s infinite;
}

[data-theme="dark"] .legend-chip:hover .legend-color.match {
  animation: pulse-match-dark 1s infinite;
}

.legend-color.current {
  background: var(--accent);
}

.legend-chip:hover .legend-color.current {
  animation: pulse-accent 1s infinite;
}

[data-theme="dark"] .legend-chip:hover .legend-color.current {
  animation: pulse-accent-dark 1s infinite;
}

.legend-color.trace {
  background: #f59e0b;
}

.legend-chip:hover .legend-color.trace {
  animation: pulse-trace 1s infinite;
}

[data-theme="dark"] .legend-chip:hover .legend-color.trace {
  animation: pulse-trace-dark 1s infinite;
}

[data-theme="deep-blue"] .legend-chip:hover .legend-color.trace {
  animation: pulse-trace-deep-blue 1s infinite;
}

.legend-color.base {
  background: var(--text-muted);
}

table.dp-table {
  border-collapse: separate;
  border-spacing: 0;
  font-size: 11px;
  min-width: max-content;
  border: 1px solid var(--border-strong);
  transition: all var(--transition-med) cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] .dp-table th,
[data-theme="dark"] .dp-table td {
  font-size: 11px;
  min-width: 29px;
  max-width: 37px;
}

[data-theme="deep-blue"] .dp-table th,
[data-theme="deep-blue"] .dp-table td {
  font-size: 11px;
  border-color: rgba(100, 116, 139, 0.5);
}

.dp-table th,
.dp-table td {
  border: 1px solid var(--border-strong);
  padding: 8px 3px;  /* Adjusted padding for 36px height */
  text-align: center;
  min-width: 34px;
  max-width: 34px;
  width: 37.5px;
  height: 39.5px;      /* CORRECT - 36px height */
  transition: all var(--transition-med) cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

/* FIXED: Better font rendering for DP table headers */
.dp-table th {
  background: var(--bg-panel);
  position: sticky;
  top: 0;
  z-index: 2;
  border-color: var(--border-strong);
  font-weight: 600;
  text-shadow: 0 0 1px transparent;
  backface-visibility: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

[data-theme="dark"] .dp-table th {
  background: var(--bg-panel);
  border-color: var(--border-strong);
}

[data-theme="deep-blue"] .dp-table th {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.5);
}

.dp-table th.corner {
  left: 0;
  z-index: 3;
  border-color: var(--border-strong);
  background: var(--bg-elevated);
}
.dp-table th:not(.corner):not(.header-col),
.dp-table td:not(.header-col) {
  padding: 5px 3px;  /* Reduced vertical padding for square look */
}

/* For header cells: */
.dp-table td.header-col {
  padding: 5px 3px;  /* Reduced from 6px 3px */
  min-width: 34px;
  max-width: 34px;
  width: 34px;
  height: 36px;
}
/* FIXED: DP Table Row Header */
.dp-table td.header-col {
  position: sticky;
  left: 0;
  background: var(--bg-panel);
  z-index: 1;
  font-weight: 600;      /* Changed from 500 */
  border-color: var(--border-strong);
  background: var(--bg-elevated);
  font-family: "SF Mono", ui-monospace, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 12px;       /* Changed from 11px */
  line-height: 1.2;
  padding: 6px 3px;      /* Changed from 3px 4px */
  min-width: 34px;       /* Add to match other cells */
  max-width: 34px;       /* Add to match other cells */
  width: 34px;           /* Add fixed width */
  height: 36px;          /* Add fixed height */
}

.dp-table td.header-col small {
  display: block;
  font-size: 8px;     /* Reduced from 9px */
  opacity: 0.6;
  margin-top: 0;      /* Removed margin */
  line-height: 1;
}
/* Ensure table rows have minimal height */
.dp-table tr {
  height: 36px;  /* Match cell height */
}

/* Remove cell spacing if any */
table.dp-table {
  border-collapse: collapse;
  border-spacing: 0;
}
.header-cell {
  font-family: "SF Mono", ui-monospace, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 11px;
  line-height: 1;
  color: var(--accent);
  text-shadow: 0 0 1px transparent;
  backface-visibility: hidden;
}


[data-theme="dark"] .header-cell {
  color: var(--accent);
}

.dp-cell {
  background: var(--bg-panel-soft);
  color: var(--text-main);
  transition: all var(--transition-med) cubic-bezier(0.4, 0, 0.2, 1);
  border-color: var(--border-subtle);
}

[data-theme="dark"] .dp-cell {
  background: var(--bg-panel-soft);
  color: var(--text-main);
  border-color: var(--border-subtle);
}

[data-theme="deep-blue"] .dp-cell {
  background: #1e293b;
  color: #e2e8f0;
  border-color: rgba(100, 116, 139, 0.3);
}

.dp-cell-base {
  background: var(--bg-panel);
  color: var(--text-muted);
  border-color: var(--border-subtle);
}

.dp-cell-match {
  background: rgba(5, 150, 105, 0.2);  /* Changed from rgba(13, 148, 136, 0.14) */
  border-color: rgba(5, 150, 105, 0.4); /* Changed from rgba(13, 148, 136, 0.3) */
}

[data-theme="dark"] .dp-cell-match {
  background: rgba(34, 197, 94, 0.14);
  border-color: rgba(34, 197, 94, 0.3);
}

[data-theme="deep-blue"] .dp-cell-match {
  background: rgba(16, 185, 129, 0.14);
  border-color: rgba(16, 185, 129, 0.3);
}

.dp-cell-match:hover {
  box-shadow: var(--glow-match);
}

.dp-cell-current {
  background: rgba(14, 165, 233, 0.25); /* Changed from var(--accent-soft-strong) - more contrast */
  z-index: 1;
  animation: highlight-cell 1.5s infinite;
  box-shadow: 0 0 0 2px var(--accent), var(--glow-accent); /* Added inner border */
  border-color: var(--accent);
  border-width: 2px;
}

[data-theme="dark"] .dp-cell-current {
  background: var(--accent-soft-strong);
  box-shadow: var(--glow-accent);
  border-color: var(--accent);
}

[data-theme="deep-blue"] .dp-cell-current {
  background: rgba(14, 165, 233, 0.2);
  box-shadow: var(--glow-accent);
  border-color: var(--accent);
}

@keyframes highlight-cell {
  0% { transform: scale(1); }
  50% { transform: scale(1.02); }
  100% { transform: scale(1); }
}

.dp-cell-trace {
  background: rgba(245, 158, 11, 0.3);
  z-index: 2;
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.4);
  border-color: #d97706;
  border-width: 2px;
  animation: pulse-trace-yellow 2s infinite;
}

[data-theme="dark"] .dp-cell-trace {
  background: rgba(251, 191, 36, 0.28);
  box-shadow: 0 0 20px rgba(251, 191, 36, 0.5);
  border-color: #fbbf24;
  animation: pulse-trace-yellow 2s infinite;
}

[data-theme="deep-blue"] .dp-cell-trace {
  background: rgba(245, 158, 11, 0.28);
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.4);
  border-color: #d97706;
  animation: pulse-trace-yellow 2s infinite;
}

.dp-cell-inner {
  display: flex;
  flex-direction: column;
  gap: 1px;          /* Reduced gap */
  align-items: center;
  justify-content: center;
  height: 100%;      /* Only height: 100% */
}

.dp-val {
  font-size: 12px;    /* Reduced from 13px */
  font-weight: 600;
  line-height: 1;     /* Changed from 1.2 */
}

[data-theme="dark"] .dp-val {
  font-size: 11px;
}

[data-theme="deep-blue"] .dp-val {
  font-size: 11px;
}

.dp-arrow {
  font-size: 9px;
  color: var(--text-muted);
  opacity: 0.86;
}

.dp-empty {
  color: var(--text-muted);
  opacity: 0.5;
}

/* Code box */
.code-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.code-box {
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  padding: 9px;
  font-size: 11px;
  font-family: "SF Mono", ui-monospace, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
  flex: 1;
  transition: all var(--transition-med);
}

[data-theme="dark"] .code-box {
  background: var(--bg-panel-soft);
  border-color: var(--border-subtle);
}

[data-theme="deep-blue"] .code-box {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.4);
}

.code-box:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(14, 165, 233, 0.15);
}

[data-theme="dark"] .code-box:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.15);
}

[data-theme="deep-blue"] .code-box:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(14, 165, 233, 0.15);
}

.code-title-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 7px;
  color: var(--text-muted);
  font-size: 10px;
  flex-shrink: 0;
}

.code-title-row span {
  display: flex;
  align-items: center;
  gap: 5px;
}

.code-lines {
  border-radius: 6px;
  background: var(--bg-panel);
  padding: 7px;
  overflow-y: auto;
  flex: 1;
  min-height: 0;
  border: 1px solid var(--border-subtle);
}

[data-theme="dark"] .code-lines {
  background: var(--bg-panel);
  border-color: var(--border-subtle);
}

[data-theme="deep-blue"] .code-lines {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.4);
}

.code-line {
  padding: 5px 7px;
  border-radius: 4px;
  white-space: pre;
  transition: all var(--transition-med);
  margin-bottom: 3px;
  font-size: 12px;
  line-height: 1.4;
  position: relative;
}

[data-theme="dark"] .code-line {
  font-size: 12px;
  line-height: 1.5;
}

[data-theme="deep-blue"] .code-line {
  font-size: 12px;
  color: #e2e8f0;
}

.code-line::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent);
  opacity: 0;
  transition: opacity var(--transition-med);
}

[data-theme="dark"] .code-line::before {
  background: var(--accent);
}

.code-line-active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 500;
  box-shadow: 0 0 0 1px var(--accent-soft-strong);
  animation: code-pulse 2s infinite;
}

.code-line-active::before {
  opacity: 1;
}

[data-theme="dark"] .code-line-active {
  background: var(--accent-soft);
  color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-soft-strong);
}

[data-theme="deep-blue"] .code-line-active {
  background: rgba(14, 165, 233, 0.1);
  color: var(--accent);
  box-shadow: 0 0 0 1px rgba(14, 165, 233, 0.2);
}

[data-theme="dark"] .code-line-active::before {
  background: var(--accent);
}

[data-theme="deep-blue"] .code-line-active::before {
  background: var(--accent);
}

@keyframes code-pulse {
  0% { box-shadow: 0 0 0 0 var(--accent-soft-strong); }
  70% { box-shadow: 0 0 0 4px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

/* Backtracking visualization */
.backtracking-visual {
  margin-top: 9px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  padding: 9px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  transition: all var(--transition-med);
}

[data-theme="dark"] .backtracking-visual {
  background: var(--bg-panel-soft);
  border-color: var(--border-subtle);
}

[data-theme="deep-blue"] .backtracking-visual {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.4);
}

.backtracking-visual:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(14, 165, 233, 0.15);
}

[data-theme="dark"] .backtracking-visual:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.15);
}

[data-theme="deep-blue"] .backtracking-visual:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(14, 165, 233, 0.15);
}

.backtracking-title {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

[data-theme="dark"] .backtracking-title {
  font-size: 11px;
}

[data-theme="deep-blue"] .backtracking-title {
  font-size: 11px;
  color: #94a3b8;
}

.backtracking-title span {
  display: flex;
  align-items: center;
  gap: 7px;
}

.backtracking-path {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  flex-wrap: wrap;
  min-height: 41px;
}

.path-cell {
  width: 31px;
  height: 31px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel-soft);
  font-size: 11px;
  position: relative;
  transition: all var(--transition-fast);
}

[data-theme="dark"] .path-cell {
  background: var(--bg-panel-soft);
  border-color: var(--border-subtle);
  color: var(--text-main);
}

[data-theme="deep-blue"] .path-cell {
  background: #1e293b;
  border-color: rgba(100, 116, 139, 0.4);
  color: #e2e8f0;
}

.path-cell.path-match {
  background: rgba(5, 150, 105, 0.25); /* Changed from rgba(13, 148, 136, 0.2) */
  border-color: var(--match);
  color: var(--match);
  font-weight: bold;
  animation: pulse-match 2s infinite;
}

[data-theme="dark"] .path-cell.path-match {
  background: rgba(34, 197, 94, 0.2);
  border-color: var(--match);
  color: var(--match);
  animation: pulse-match-dark 2s infinite;
}

[data-theme="deep-blue"] .path-cell.path-match {
  background: rgba(16, 185, 129, 0.2);
  border-color: #10b981;
  color: #10b981;
}

.path-cell.path-trace {
  background: rgba(56, 189, 248, 0.2);
  border-color: var(--trace);
}

[data-theme="dark"] .path-cell.path-trace {
  background: rgba(251, 191, 36, 0.2);
  border-color: var(--trace);
}

[data-theme="deep-blue"] .path-cell.path-trace {
  background: rgba(56, 189, 248, 0.2);
  border-color: var(--trace);
}

.path-cell.path-start {
  background: var(--accent-soft);
  border-color: var(--accent);
  font-weight: bold;
}

.path-arrow {
  color: var(--text-muted);
  font-size: 13px;
}

/* Help tooltip */
.help-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 15px;
  height: 15px;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  background: var(--accent-soft);
  font-size: 10px;
  color: var(--accent);
  cursor: help;
  transition: all var(--transition-fast);
}

.help-icon:hover {
  border-color: var(--accent);
  transform: scale(1.1);
  box-shadow: var(--glow-accent);
}

[data-theme="dark"] .help-icon:hover {
  border-color: var(--accent);
  box-shadow: var(--glow-accent);
}

/* Footer */
footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 9px;
  font-size: 10px;
  color: var(--text-muted);
  padding: 0 5px;
  flex-shrink: 0;
}

[data-theme="dark"] footer {
  font-size: 10px;
}

[data-theme="deep-blue"] footer {
  font-size: 10px;
  color: #94a3b8;
}

footer span {
  opacity: 0.7;
  display: flex;
  align-items: center;
  gap: 5px;
}
/* Preset Heading Styles */
.preset-heading {
  margin-top: 12px;
  margin-bottom: 6px;
  padding: 0 2px;
}

.preset-title {
  font-size: 10px; /* Slightly smaller than panel-title */
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  opacity: 0.8;
}

.preset-title i {
  font-size: 10px;
  color: var(--accent);
  opacity: 0.7;
}

/* Optional: Add a subtle divider line */
.preset-heading::after {
  content: '';
  display: block;
  height: 1px;
  background: var(--border-subtle);
  margin-top: 4px;
  width: 100%;
}
/* Preset Tooltip */
.preset-tooltip {
  position: absolute;
  background: var(--bg-panel) !important;
  border: 1px solid var(--border-subtle) !important;
  border-radius: var(--radius-sm) !important;
  padding: 6px 8px !important;
  font-size: 9px !important;
  color: var(--text-main) !important;
  z-index: 1000 !important;
  max-width: 200px !important;
  box-shadow: var(--shadow-soft) !important;
  pointer-events: none !important;
  white-space: nowrap !important;
  backdrop-filter: blur(10px) !important;
}

/* Responsive */
@media (max-width: 1200px) {
  .layout {
    grid-template-columns: 320px 1fr;
  }
}

@media (max-width: 1000px) {
  .dp-visualization-area {
    flex-direction: column;
  }
  
  .dp-table-section, .code-section {
    flex: 1;
  }
  
  .premium-slider {
    --slider-height: 5px;
    --thumb-size: 18px;
  }
  
  .slider-container {
    height: 35px;
  }
  
  .speed-display {
    font-size: 9px;
  }
}

/* ===== MOBILE VERTICAL LAYOUT ===== */
@media (max-width: 768px) {
  html, body {
    height: auto;
    min-height: 100vh;
    overflow: auto;
  }

  .app-shell {
    height: auto;
    min-height: 100vh;
    overflow: visible;
    padding: 8px;
    gap: 8px;
  }

  .app-content {
    height: auto;
    overflow: visible;
  }

  /* Header: collapse pill, shrink title */
  header.app-header {
    flex-wrap: wrap;
    padding: 0 2px;
    gap: 6px;
  }

  .app-title {
    font-size: 15px;
    gap: 6px;
  }

  .app-title i {
    font-size: 14px;
  }

  .app-title-pill {
    display: none;
  }

  /* Main layout: single column, controls first */
  .layout {
    grid-template-columns: 1fr;
    overflow: visible;
    gap: 10px;
  }

  .panel {
    overflow: visible;
    min-height: auto;
  }

  /* Algorithm selector: allow wrapping */
  .algorithm-selector {
    flex-wrap: wrap;
  }

  .algo-tab {
    flex: 1 1 auto;
    min-width: 90px;
    padding: 8px 10px;
    font-size: 11px;
  }

  /* Inputs */
  input[type="text"] {
    padding: 10px 12px;
    font-size: 15px;
  }

  /* Presets */
  .preset-row {
    gap: 6px;
  }

  .chip {
    padding: 6px 12px;
    font-size: 11px;
  }

  /* Controls bigger touch targets */
  .controls-compact {
    gap: 6px;
  }

  .control-btn {
    padding: 10px 12px;
    font-size: 13px;
  }

  /* Speed slider */
  .premium-slider {
    --slider-height: 6px;
    --thumb-size: 26px;
    margin-top: 10px;
  }

  .slider-container {
    height: 44px;
    padding: 14px 0;
  }

  /* Stats grid */
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    margin-top: 8px;
  }

  .stat-card {
    padding: 8px 6px;
  }

  /* Explanation box - don't flex-grow on mobile */
  .explanation-box {
    flex: none;
    min-height: 60px;
    max-height: 120px;
  }

  /* Right panel (visualization) */
  .right-panel-content {
    overflow: visible;
  }

  /* Character comparison */
  .visual-comparison {
    padding: 8px;
  }

  .string-chars {
    gap: 4px;
    flex-wrap: wrap;
  }

  .char-box {
    min-width: 36px;
    height: 38px;
    font-size: 14px;
  }

  /* DP table area */
  .dp-wrapper {
    min-height: auto;
    overflow: visible;
  }

  .dp-visualization-area {
    flex-direction: column;
    overflow: visible;
  }

  .dp-table-section {
    overflow: visible;
  }

  .dp-table-container {
    overflow: visible;
  }

  .dp-table-scroll {
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    min-height: 180px;
    max-height: 50vh;
  }

  /* Code section */
  .code-section {
    min-height: auto;
  }

  .code-box {
    max-height: 200px;
  }

  .code-lines {
    max-height: 160px;
  }

  /* Backtracking */
  .backtracking-visual {
    margin-top: 8px;
  }

  .backtracking-path {
    gap: 6px;
  }

  .path-cell {
    width: 28px;
    height: 28px;
    font-size: 10px;
  }

  /* Footer */
  footer {
    flex-direction: column;
    gap: 4px;
    text-align: center;
    padding: 6px 0;
  }

  footer kbd {
    display: none;
  }

  /* Modal */
  .modal-content {
    width: 95%;
  }
}

/* Extra small phones */
@media (max-width: 400px) {
  .app-title {
    font-size: 13px;
  }

  .algo-tab {
    min-width: 70px;
    font-size: 10px;
    padding: 6px 6px;
  }

  .control-btn {
    padding: 9px 8px;
    font-size: 12px;
  }

  .char-box {
    min-width: 30px;
    height: 32px;
    font-size: 12px;
  }

  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Mobile touch improvements */
@media (hover: none) and (pointer: coarse) {
  .premium-slider-thumb {
    width: 28px;
    height: 28px;
  }
  
  .char-box {
    min-width: 38px;
    height: 40px;
  }

  .control-btn {
    min-height: 40px;
  }

  .chip {
    min-height: 32px;
  }

  .algo-tab {
    min-height: 36px;
  }
}

/* Loading animation */
.loading {
  display: inline-block;
  width: 13px;
  height: 13px;
  border: 2px solid var(--border-subtle);
  border-top: 2px solid var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Font Awesome icon spacing */
i {
  opacity: 0.8;
}