:root {
  --color-primary: #4361ee;
  --color-primary-light: #4895ef;
  --color-primary-dark: #3a0ca3;
  --color-secondary: #4cc9f0;
  --color-secondary-light: #72efdd;
  --color-secondary-dark: #3f8efc;
  --color-accent: #f72585;
  --color-accent-light: #ff8fab;
  --color-accent-dark: #b5179e;
  --color-success: #4caf50;
  --color-error: #f44336;
  --color-neutral-50: #f8fafc;
  --color-neutral-100: #f1f5f9;
  --color-neutral-200: #e2e8f0;
  --color-neutral-300: #cbd5e1;
  --color-neutral-400: #94a3b8;
  --color-neutral-500: #64748b;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1e293b;
  --color-neutral-900: #0f172a;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --shadow-md: 0 4px 6px -1px rgba(67, 97, 238, 0.08),
    0 2px 4px -1px rgba(67, 97, 238, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(67, 97, 238, 0.1),
    0 4px 6px -2px rgba(67, 97, 238, 0.05);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--color-neutral-800);
  background-color: var(--color-neutral-50);
  font-size: 0.97em;
  min-height: 100vh;
  overflow-x: visible;
}

/* Ensure consistent font inheritance across all text elements */
h1,
h2,
h3,
h4,
h5,
h6,
p,
div,
span,
label,
input,
select,
textarea,
button,
th,
td,
li,
ul,
ol,
.sim-section-title,
.sim-sentence-text,
.sim-sentence-header,
.instructions-list,
.instructions-header,
.pos-tags-table,
.emission-matrix-table,
.transition-matrix-table,
.feedback-message,
.sim-feedback,
.sim-hint,
.btn,
.sim-button,
.matrix-title,
.matrix-content-area {
  font-family: inherit !important;
}

.container {
  max-width: 100vw;
  margin: 0 auto;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  width: 100%;
  /* Remove overflow-x: auto here to prevent bar on landing */
}

.main-content {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: 0 15px;
}

/* Only allow horizontal scroll on table containers, not on page load */
#output-table-container {
  overflow-x: auto !important;
  max-width: 100%;
  width: 100%;
  box-sizing: border-box;
}

/* Ensure proper order for all screens */
.instructions-panel {
  order: 0; /* Instructions panel first */
}

#main-2pane-container {
  display: flex;
  flex-direction: row;
  gap: 1rem; /* Reduced from 2rem to 1rem */
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
  box-sizing: border-box;
  overflow: hidden; /* Prevent table spillage */
}

/* Instructions Panel - Remove bottom curves to match word analysis */
.instructions-panel {
  width: 100%;
  max-width: 100%;
  margin: 0 auto 1.2rem auto;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: center;
  padding: 0;
  border-radius: 16px 16px 0 0; /* Remove bottom curves */
}

.instructions-header {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 12px 24px;
  background: linear-gradient(90deg, #6ef2e6 0%, #4895ef 100%);
  border-bottom: 2px solid #4895ef;
  cursor: pointer;
  transition: background 0.2s;
  border-radius: 16px 16px 0 0; /* Remove bottom curves */
  gap: 12px;
  box-shadow: 0 4px 12px rgba(67, 97, 238, 0.08),
    0 2px 4px rgba(67, 97, 238, 0.04);
  color: #222;
}

.instructions-header .arrow-icon {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
  color: var(--color-primary-dark);
}

.instructions-header:not(.collapsed) .arrow-icon {
  transform: rotate(180deg);
}

.instructions-header:hover {
  background: linear-gradient(90deg, #72efdd 0%, #4895ef 100%);
  box-shadow: 0 6px 16px rgba(67, 97, 238, 0.12),
    0 2px 4px rgba(67, 97, 238, 0.06);
}

.instructions-header h3 {
  margin: 0;
  color: #3a0ca3;
  font-weight: 700;
  font-size: 1.18em;
}

.toggle-btn {
  background: none;
  border: none;
  color: var(--color-primary-dark);
  cursor: pointer;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.2s;
}

.toggle-btn:hover {
  background-color: rgba(67, 97, 238, 0.1);
  transform: translateY(-1px);
}

.instructions-content {
  padding: 0.7rem 0.5rem;
  max-width: 100%;
  width: 100%;
  box-sizing: border-box;
  background: var(--color-neutral-100);
  border-radius: 0; /* Remove curves to match word analysis */
  box-shadow: 0 2px 8px rgba(67, 97, 238, 0.04);
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1),
    opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
  opacity: 1;
  max-height: 400px;
}

.instructions-content.collapsed {
  display: block;
  opacity: 0;
  max-height: 0;
  padding-top: 0;
  padding-bottom: 0;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1),
    opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.instructions-list {
  list-style: disc inside;
  margin: 0.2em 0 0.2em 1em;
  padding: 0;
  font-size: 1em;
  color: var(--color-neutral-800);
  line-height: 1.5;
}

.instructions-list li {
  margin-bottom: 0.3em;
}

/* Legacy support for existing HTML structure */
#instructions-bar {
  display: none;
}

#instructions-content {
  display: none;
}

/* Left pane - corpus selection, test sentence, and matrices */
#left-pane {
  flex: 0 0 25% !important; /* Reduced from 40% to 25% */
  width: 25% !important;
  max-width: 25% !important;
  min-width: 280px; /* Reduced from 350px */
  padding: 15px;
  box-sizing: border-box;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

/* Right pane - results and output */
#right-pane {
  flex: 1 !important; /* Takes all remaining space */
  width: auto !important; /* Let it take remaining space */
  max-width: none !important; /* Remove max-width constraint */
  padding: 15px;
  box-sizing: border-box;
  overflow-x: auto;
  overflow-y: hidden;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.matrices-section {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-neutral-200);
  width: auto; /* Let content determine width */
  min-width: 0;
  overflow-x: visible;
  display: flex; /* Use flexbox for centering */
  flex-direction: column; /* Stack content vertically */
  align-items: center; /* Center content horizontally */
}

.pos-tags-section {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-neutral-200);
  margin-top: 1.5rem;
  width: 100%;
  box-sizing: border-box;
}

.pos-tags-section .sim-section-title {
  color: var(--color-primary-dark);
  font-size: 1.3em;
  margin: 0 0 1rem 0;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-align: center; /* Center the title */
  align-self: stretch; /* Allow title to take full width */
}

/* Section Titles */
.sim-section-title {
  color: var(--color-primary-dark);
  font-size: 1.3em;
  margin: 0 0 0.1rem 0;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-align: center; /* Center section titles */
  align-self: stretch; /* Allow title to take full width of flex container */
}

/* Simulation Step Styling */
.simulation-step {
  background: #fff;
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-lg);
  padding: 1.2em;
  margin-bottom: 1em;
  max-width: 100%;
  text-align: center;
  transition: box-shadow 0.2s;
  border: 1px solid var(--color-neutral-200);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
}

.simulation-step .step-heading {
  font-size: 1.19em;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 0.1em;
  margin-top: 0;
  letter-spacing: 0.01em;
}

/* Fix dropdown width consistency */
.dropdown-row,
.dropdown-container {
  width: 100% !important;
  min-width: 250px !important;
  max-width: 100% !important;
  box-sizing: border-box;
  margin: 0 0 12px 0;
}

.dropdown-row select,
.dropdown-container select {
  width: 100% !important;
  min-width: 250px !important;
  max-width: 100% !important;
  box-sizing: border-box;
}

/* Dropdowns */
select {
  width: 100%;
  background: var(--color-neutral-100);
  border: 2px solid var(--color-neutral-300);
  border-radius: var(--radius-md);
  color: var(--color-neutral-800);
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 1rem;
  margin-top: 1rem;
  box-shadow: var(--shadow-md);
  transition: all 0.2s ease;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.5rem center;
  background-repeat: no-repeat;
  background-size: 1.5rem 1.5rem;
  padding-right: 2.5rem;
}

select:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}

select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
  outline: none;
}

/* Corpus content styling */
.corpus-sentences,
.corpus-content,
#find-bigram-btn-container,
#bigramBtn {
  width: 100% !important;
  max-width: 100% !important;
  min-width: 0;
  margin: 0 0 12px 0;
  box-sizing: border-box;
}

#find-bigram-btn-container:empty,
.find-bigram-btn-container:empty {
  display: none !important;
}

.corpus-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.corpus-sentence {
  width: 100%;
  text-align: left;
  margin-bottom: 4px;
  margin-left: 1em;
  padding-left: 0.5em;
  line-height: 1.4;
}

/* Output table container - prevent overflow */
#output-table-container {
  overflow-x: auto !important;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

/* Tables */
table,
.emission-matrix-table,
.transition-matrix-table {
  width: 100%;
  max-width: 100%;
  border-collapse: collapse;
  margin: 1rem auto; /* Center tables horizontally */
  background: #fff;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-neutral-200);
  table-layout: auto;
}

table th,
.emission-matrix-table th,
.transition-matrix-table th {
  background: var(--color-neutral-100);
  color: var(--color-neutral-800);
  padding: 1rem 0.75rem;
  font-weight: 600;
  text-align: center;
  border: 1px solid var(--color-neutral-300);
  font-size: 0.95em;
  letter-spacing: 0.01em;
}

table td,
.emission-matrix-table td,
.transition-matrix-table td {
  padding: 0.75rem;
  text-align: center;
  border: 1px solid var(--color-neutral-300);
  background: #fff;
  font-size: 0.9em;
  color: var(--color-neutral-800);
}

table tr:nth-child(even) td {
  background: var(--color-neutral-50);
}

table tr:hover td {
  background: var(--color-neutral-100);
}

/* POS tags table styling */
.pos-tags-table {
  width: auto;
  border-collapse: collapse;
  margin: 1rem auto 0 auto;
  background: #fff;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-neutral-200);
  table-layout: auto;
}

.pos-tags-table th {
  background: var(--color-neutral-100);
  color: var(--color-neutral-800);
  padding: 1rem 0.75rem;
  font-weight: 600;
  text-align: center;
  border: 1px solid var(--color-neutral-300);
  font-size: 0.95em;
  letter-spacing: 0.01em;
}

.pos-tags-table td {
  padding: 0.75rem;
  text-align: center;
  border: 1px solid var(--color-neutral-300);
  background: #fff;
  font-size: 0.9em;
  color: var(--color-neutral-800);
  font-weight: 500;
}

.pos-tags-table .sim-pos-tag {
  background: rgba(67, 97, 238, 0.1);
  color: var(--color-primary-dark);
  font-weight: 600;
  padding: 0.75rem;
  border: 1px solid var(--color-primary-light);
}

/* Input fields in tables */
table input[type="text"] {
  width: 100%;
  max-width: 80px;
  padding: 0.4rem 0.6rem;
  border: 2px solid var(--color-neutral-300);
  border-radius: var(--radius-md);
  text-align: center;
  font-size: 0.9em;
  background: #fff;
  color: var(--color-neutral-800);
  transition: all 0.2s ease;
}

table input[type="text"]:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
  outline: none;
}

table input[type="text"].correct {
  border-color: var(--color-success);
  background: rgba(76, 175, 80, 0.1);
}

table input[type="text"].incorrect {
  border-color: var(--color-error);
  background: rgba(244, 67, 54, 0.1);
}

/* Buttons - Reduce border visibility */
.button-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
  justify-content: center;
}

.btn,
.sim-button,
button,
.find-bigram-btn {
  border: 1px solid rgba(255, 255, 255, 0.05) !important; /* Much more subtle border */
  border-radius: 2.2rem;
  font-size: 1rem;
  font-weight: 700;
  padding: 0.75rem 1.5rem;
  margin: 0.2rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04) !important; /* Very subtle shadow */
  transition: all 0.2s ease;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  text-decoration: none;
  min-width: 120px;
  justify-content: center;
}

/* Primary buttons (Check button) */
.btn-primary,
.sim-button,
.find-bigram-btn {
  background: linear-gradient(
    90deg,
    var(--color-primary) 60%,
    var(--color-secondary) 100%
  );
  color: #fff;
}

.btn-primary:hover,
.sim-button:hover:not(:disabled),
.find-bigram-btn:hover:not(:disabled) {
  background: linear-gradient(
    90deg,
    var(--color-primary-dark) 60%,
    var(--color-accent) 100%
  );
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15) !important;
}

/* Disabled buttons */
.btn:disabled,
.sim-button:disabled,
button:disabled {
  background: var(--color-neutral-400) !important;
  color: var(--color-neutral-200) !important;
  cursor: not-allowed !important;
  opacity: 0.6 !important;
  transform: none !important;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08) !important;
}

.btn:disabled:hover,
.sim-button:disabled:hover,
button:disabled:hover {
  background: var(--color-neutral-400) !important;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08) !important;
  transform: none !important;
}

/* Feedback and Messages */
.feedback-message,
.sim-feedback {
  padding: 1rem 1.5rem;
  margin: 1rem 0;
  border-radius: var(--radius-lg);
  border: 1px solid;
  font-weight: 500;
  text-align: center;
  display: none; /* Hidden by default */
}

.feedback-success {
  background: rgba(76, 175, 80, 0.1);
  border-left-color: var(--color-success);
  color: var(--color-success);
}

.feedback-error {
  background: rgba(244, 67, 54, 0.1);
  border-left-color: var(--color-error);
  color: var(--color-error);
}

/* Sentence Display */
.sim-sentence {
  font-size: 1.15em;
  font-weight: 500;
  color: var(--color-neutral-800);
  line-height: 1.6;
  text-align: center;
  padding: 1rem 1.5rem;
  background: var(--color-neutral-100);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-neutral-200);
}

.sim-sentence-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

#full-sentence .sim-sentence-header {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
}

#fldiv .sim-sentence-header {
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
}

.sim-sentence-header .sim-section-title {
  margin-bottom: 0.25rem;
  font-weight: 600;
  color: var(--color-neutral-800);
}

/* In right pane, remove bottom margin from title */
#fldiv .sim-sentence-header .sim-section-title {
  margin-bottom: 0;
}

.sim-sentence-text {
  font-weight: normal;
  flex: 1;
  min-width: 0;
  line-height: 1.5;
  text-align: center;
}

/* Info icon styling identical to Markov experiment */
.info-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  min-width: 22px;
  min-height: 22px;
  border-radius: 50%;
  background-color: var(--color-primary-dark);
  color: white;
  font-size: 0.75rem;
  margin-left: 0.5rem;
  cursor: help;
  transition: background-color 0.2s ease;
  vertical-align: middle;
  border: none;
  padding: 0;
  box-sizing: border-box;
}

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

.info-icon:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Modal overlay and content */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.modal-content {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 600px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  position: relative;
}

.modal-header {
  padding: 1.5rem 1.5rem 1rem;
  border-bottom: 1px solid var(--color-neutral-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  margin: 0;
  color: var(--color-neutral-800);
  font-size: 1.25rem;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  color: var(--color-neutral-500);
  cursor: pointer;
  padding: 0;
  border-radius: 50%;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  min-width: 2rem;
  min-height: 2rem;
  flex-shrink: 0;
  aspect-ratio: 1;
  font-size: 1rem;
  line-height: 1;
}

.modal-close i {
  display: block;
  font-size: inherit;
  line-height: 1;
}

.modal-close:hover {
  background-color: var(--color-neutral-100);
  color: var(--color-neutral-700);
}

.modal-close:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.modal-body {
  padding: 1rem 1.5rem;
  color: var(--color-neutral-700);
  line-height: 1.6;
}

.modal-body ul {
  margin: 1rem 0;
  padding-left: 1.5rem;
}

.modal-body li {
  margin-bottom: 0.5rem;
}

.modal-body strong {
  color: var(--color-neutral-800);
  font-weight: 600;
}

.modal-body em {
  color: var(--color-primary);
  font-style: italic;
}

.modal-footer {
  padding: 1rem 1.5rem 1.5rem;
  border-top: 1px solid var(--color-neutral-200);
  display: flex;
  justify-content: flex-end;
}

/* Responsive modal */
@media (max-width: 640px) {
  .modal-overlay {
    padding: 0.5rem;
  }

  .modal-content {
    max-height: 90vh;
  }

  .modal-header,
  .modal-body,
  .modal-footer {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .sim-sentence-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .info-icon {
    align-self: flex-end;
    margin-left: 0;
  }
}

/* Desktop Layout - when screen is wide enough */
@media (min-width: 1200px) {
  .main-content {
    padding: 0 2rem;
  }

  /* Main-2pane-container should match main-content width */
  #main-2pane-container {
    flex-direction: row;
    gap: 1rem; /* Reduced gap for desktop too */
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
    overflow-x: visible;
    justify-content: flex-start;
  }

  /* Instructions panel will be sized by JavaScript to match main-2pane-container */
  .instructions-panel {
    margin: 0.2rem auto; /* Center horizontally like main-2pane-container */
    min-width: 0; /* Allow natural sizing */
  }

  #left-pane {
    flex: 0 0 25% !important; /* Consistent 25% on desktop */
    width: 25% !important;
    min-width: 280px;
    max-width: 25% !important;
  }

  #right-pane {
    flex: 1 !important; /* Takes remaining 75% minus gap */
    width: auto !important;
    min-width: 0;
    max-width: none !important;
  }

  /* Allow content-based sizing for sections */
  .matrices-section {
    overflow-x: auto;
    width: auto; /* Let content determine section width */
  }

  /* Ensure matrices size naturally */
  .matrices-section table {
    width: auto; /* Natural table width */
    max-width: none; /* Remove max width constraint */
  }
}

/* Tablet Layout */
@media (min-width: 768px) and (max-width: 1199px) {
  .main-content {
    padding: 0 1rem; /* Outer padding for page layout */
  }

  /* Main-2pane-container transforms to column layout */
  #main-2pane-container {
    flex-direction: column;
    gap: 1rem; /* Reduced gap for tablet */
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
    overflow-x: visible;
  }

  /* Instructions panel will be sized by JavaScript to match main-2pane-container */
  .instructions-panel {
    margin: 0.2rem auto; /* Center horizontally like main-2pane-container */
    min-width: 0; /* Allow natural sizing */
  }

  #left-pane,
  #right-pane {
    width: 100%;
    max-width: none; /* Allow full table width */
    min-width: 0;
  }

  .matrices-section {
    padding: 1.25rem;
  }

  .btn,
  .sim-button {
    flex: 1;
    min-width: 140px;
    max-width: 200px;
  }

  /* Responsive info icon for tablets */
  .info-icon {
    width: 21px;
    height: 21px;
    min-width: 21px;
    min-height: 21px;
    font-size: 0.72rem;
  }

  /* Table responsive adjustments for tablets */
  table,
  .pos-tags-table {
    font-size: 0.9em;
  }

  table th,
  .pos-tags-table th {
    padding: 0.8rem 0.6rem;
    font-size: 0.9em;
  }

  table td,
  .pos-tags-table td {
    padding: 0.65rem 0.5rem;
    font-size: 0.85em;
  }

  table input[type="text"] {
    max-width: 70px;
    font-size: 0.85em;
  }
}

/* Replace the Mobile Layout section (lines 736-900) with this updated version: */

/* Mobile Layout */
@media (max-width: 767px) {
  .main-content {
    padding: 0 0.5rem;
    width: 100%;
    max-width: 100vw;
    display: flex;
    flex-direction: column;
    align-items: center; /* Center all content */
  }

  /* Instructions panel comes first and centered */
  .instructions-panel {
    order: 0;
    width: 100%;
    max-width: 100%;
    margin: 0.5rem auto 1rem auto;
    box-sizing: border-box;
  }

  .instructions-header {
    padding: 0.75rem 1rem;
  }

  .instructions-header h3 {
    font-size: 1.1em;
  }

  .instructions-content {
    padding: 1rem 1.5rem;
  }

  .instructions-list {
    font-size: 0.93em;
  }

  /* Main container transforms to column layout and centers content */
  #main-2pane-container {
    order: 1;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
    max-width: 100%;
    margin: 0 auto; /* Center the container */
    padding: 0;
    overflow-x: visible;
    display: flex;
    align-items: center; /* Center child elements horizontally */
  }

  /* Left pane becomes centered and appears first */
  #left-pane {
    flex: none !important;
    width: 90% !important; /* Slightly less than full width for better centering */
    max-width: 500px !important; /* Max width for better readability */
    min-width: 0 !important;
    padding: 1rem;
    margin: 0 auto 1rem auto; /* Center horizontally with bottom margin */
    order: 1; /* First in mobile */
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: stretch; /* Stretch content within the pane */
  }

  /* Right pane appears below left pane and centered */
  #right-pane {
    flex: none !important;
    width: 90% !important; /* Slightly less than full width for better centering */
    max-width: 500px !important; /* Max width for better readability */
    min-width: 0 !important;
    padding: 1rem;
    margin: 0 auto; /* Center horizontally */
    order: 2; /* Second in mobile */
    box-sizing: border-box;
    overflow-x: auto;
    overflow-y: visible;
    display: flex;
    flex-direction: column;
    align-items: stretch; /* Stretch content within the pane */
  }

  /* Fix corpus sections to work within centered layout */
  #corpus-info {
    padding: 0.75rem;
    margin-bottom: 1rem;
    width: 100%;
  }

  #corpus-selection {
    width: 100%;
    max-width: 100%;
    margin: 0 auto 1rem auto;
    padding: 0.75rem;
    box-sizing: border-box;
  }

  /* Compact matrices on mobile */
  .matrices-section {
    padding: 0.75rem;
    overflow-x: auto;
    width: 100%;
  }

  .matrices-headers {
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
  }

  .matrix-title {
    padding: 0.5rem 0.75rem;
    font-size: 0.9em;
    min-width: 100px;
    flex: 1 1 auto;
  }

  .matrix-content-area {
    min-height: 0;
    width: 100%;
  }

  .matrix-table-display > .sim-section-title {
    display: none;
  }

  .matrix-table-display table {
    margin: 0;
    width: 100%;
    font-size: 0.85em;
  }

  /* Compact info icon */
  .info-icon {
    width: 18px;
    height: 18px;
    min-width: 18px;
    min-height: 18px;
    font-size: 0.65rem;
    margin-left: 0.25rem;
  }

  /* Mobile sentence headers */
  .sim-sentence-header {
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    text-align: center;
  }

  #fldiv .sim-sentence-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  #fldiv .sim-sentence-header .info-icon {
    margin-left: 0;
    margin-top: 0.25rem;
  }

  /* Mobile button layout */
  .button-controls {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    padding: 0.5rem;
    gap: 0.5rem;
  }

  .btn,
  .sim-button {
    width: 100% !important;
    max-width: none !important;
    min-width: 0 !important;
    margin: 0 !important;
    font-size: 0.95rem;
    padding: 0.75rem 1rem;
    border-radius: 1.5rem;
  }

  /* Mobile table styling */
  table,
  .pos-tags-table {
    font-size: 0.8em;
    min-width: 100%;
  }

  table th,
  .pos-tags-table th {
    padding: 0.5rem 0.25rem;
    font-size: 0.75em;
  }

  table td,
  .pos-tags-table td {
    padding: 0.4rem 0.2rem;
    font-size: 0.75em;
  }

  table input[type="text"] {
    max-width: 50px;
    padding: 0.25rem 0.35rem;
    font-size: 0.75em;
  }

  /* Mobile feedback */
  .feedback-message {
    padding: 0.75rem 1rem;
    font-size: 0.9em;
    margin: 0.5rem 0;
  }

  #sim-hint .sim-hint {
    padding: 0.75rem 1rem;
    font-size: 0.85em;
  }

  /* Fix dropdown consistency on mobile */
  .dropdown-row,
  .dropdown-container {
    min-width: 0 !important;
    width: 100% !important;
  }

  .dropdown-row select,
  .dropdown-container select {
    min-width: 0 !important;
    width: 100% !important;
    font-size: 0.9rem;
    padding: 0.6rem 2rem 0.6rem 0.8rem;
  }

  /* Hide empty button containers properly on mobile */
  #find-bigram-btn-container:empty {
    display: none !important;
    height: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
  }
}

/* Override in mobile view for dropdowns */
@media (max-width: 600px) {
  .dropdown-row,
  .dropdown-container {
    min-width: 0 !important;
  }

  .dropdown-row select,
  .dropdown-container select {
    min-width: 0 !important;
  }

  #main-2pane-container {
    flex-direction: column;
    gap: 0.5rem;
    max-width: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
  }

  #left-pane,
  #right-pane {
    min-width: 0;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 0 0.5rem;
    display: flex;
    flex-direction: column;
    position: static;
    visibility: visible;
    height: auto;
    overflow: visible;
  }

  #left-pane {
    margin-bottom: 0.5rem;
    min-height: 1px;
  }

  #corpus-selection {
    width: 100%;
    max-width: 100%;
    margin: 0 auto 0.5rem auto;
    padding: 0.5rem 0.2rem;
    box-sizing: border-box;
  }
}

/* Very small screens */
@media (max-width: 480px) {
  .main-content {
    padding: 0 0.25rem; /* Outer padding for page layout */
  }

  /* Main-2pane-container should match main-content width */
  #main-2pane-container {
    order: 1; /* Main content second */
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
  }

  /* Instructions panel will be sized by JavaScript to match main-2pane-container */
  .instructions-panel {
    order: 0; /* Instructions panel first */
    margin: 0.2rem auto; /* Center horizontally like main-2pane-container */
    min-width: 0; /* Allow natural sizing */
  }

  .instructions-header {
    padding: 0.5rem 0.75rem;
  }

  .instructions-header h3 {
    font-size: 1em;
  }

  .instructions-content {
    padding: 0.75rem 1rem;
  }

  .sim-section-title {
    font-size: 1em;
    margin-bottom: 0.2rem;
  }

  .matrices-section,
  #corpus-selection,
  #corpus-info {
    padding: 0.5rem;
  }

  /* Keep matrices tabbed even on very small screens */
  .matrices-headers {
    gap: 0.25rem;
    flex-wrap: wrap; /* Allow wrapping on very small screens */
  }

  .matrix-title {
    padding: 0.5rem 0.75rem;
    font-size: 0.9em;
    min-width: 100px; /* Even smaller minimum width for very small screens */
    flex: 1; /* Allow equal distribution */
  }

  .matrix-content-area {
    min-height: 0; /* Remove min-height constraint on very small screens */
  }

  .matrix-table-display > .sim-section-title {
    display: none; /* Keep section titles hidden */
  }

  .matrix-table-display table {
    margin: 0; /* Remove table margins on very small screens */
  }

  /* Ultra-compact info icon */
  .info-icon {
    width: 18px;
    height: 18px;
    min-width: 18px;
    min-height: 18px;
    font-size: 0.65rem;
    margin-left: 0.25rem;
  }

  /* Ultra-compact sentence headers */
  .sim-sentence-header {
    gap: 0.1rem;
  }

  /* Ultra-compact tables */
  table,
  .pos-tags-table {
    min-width: 320px; /* Further reduced for very small screens */
    font-size: 0.75em;
  }

  table th,
  .pos-tags-table th {
    padding: 0.4rem 0.2rem;
    font-size: 0.7em;
  }

  table td,
  .pos-tags-table td {
    padding: 0.35rem 0.15rem;
    font-size: 0.7em;
  }

  table input[type="text"] {
    max-width: 50px;
    padding: 0.25rem 0.3rem;
    font-size: 0.7em;
  }

  /* Ultra-compact buttons */
  .btn,
  .sim-button {
    font-size: 0.85rem;
    padding: 0.5rem 0.75rem;
    min-height: 40px;
  }

  /* Ultra-compact feedback */
  .feedback-message {
    padding: 0.5rem 0.75rem;
    font-size: 0.8em;
  }

  #sim-hint .sim-hint {
    padding: 0.5rem 0.75rem;
    font-size: 0.8em;
  }

  /* Ultra-compact modal */
  .modal-overlay {
    padding: 0.25rem;
  }

  .modal-content {
    max-height: 90vh;
  }

  .modal-header,
  .modal-body,
  .modal-footer {
    padding: 0.75rem;
  }

  .modal-body {
    font-size: 0.85em;
  }

  .modal-header h3 {
    font-size: 1.1rem;
  }
}

/* Extra responsive breakpoint for medium-small screens */
@media (min-width: 481px) and (max-width: 640px) {
  .sim-sentence-header {
    flex-direction: row;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
  }

  #fldiv .sim-sentence-header {
    flex-direction: row;
    align-items: center;
    justify-content: center;
  }

  #fldiv .sim-sentence-header .info-icon {
    margin-left: 0.4rem;
    margin-top: 0;
  }

  .btn,
  .sim-button {
    flex: 1;
    min-width: 120px;
    max-width: 180px;
  }
}

/* Hint area - full width */
#sim-hint {
  width: 100%;
  margin: 1rem 0 0 0;
  display: none !important; /* Hidden by default */
}

#sim-hint.show,
#sim-hint:not(:empty) {
  display: block !important;
}

#sim-hint .sim-hint {
  width: 100%;
  box-sizing: border-box;
  margin: 0.5rem 0;
  padding: 1rem 1.5rem;
  background: #f6faff;
  border: 1px solid #e3f2fd;
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  color: var(--color-neutral-700);
  font-size: 0.95em;
  line-height: 1.5;
  box-shadow: 0 2px 4px rgba(67, 97, 238, 0.08);
  display: block !important;
}

#sim-hint .sim-hint:first-child {
  margin-top: 0;
}

#sim-hint .sim-hint:last-child {
  margin-bottom: 0;
}

/* Ensure POS tags section displays properly in feedback area */
.pos-tags-section {
  margin-top: 1.5rem;
  margin-bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center; /* Center content in the section */
}

.pos-tags-section .sim-section-title {
  text-align: center; /* Center the title */
  margin-bottom: 1rem;
  align-self: stretch; /* Allow title to take full width */
}

.pos-tags-table {
  margin: 1rem auto 0 auto; /* Center the table */
}

/* Combined Corpus Section */
#corpus-combined-section {
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-neutral-200);
  overflow: hidden;
  margin-bottom: 0;
}

#corpus-combined-section #corpus-selection {
  background: none;
  border: none;
  box-shadow: none;
  border-radius: 0;
  padding: 0.5rem 1rem;
  margin: 0;
  border-bottom: 1px solid var(--color-neutral-200);
}

#corpus-combined-section #corpus-info {
  background: none;
  border: none;
  box-shadow: none;
  border-radius: 0;
  padding: 0.5rem 1rem;
  margin: 0;
}

/* Matrices Tabbed Interface - Titles in One Row */
.matrices-headers {
  display: flex;
  flex-direction: row;
  gap: 1rem;
  margin-bottom: 1rem;
  width: 100%;
  box-sizing: border-box;
  justify-content: center; /* Center the tab headers */
}

.matrix-title {
  flex: 0 0 auto; /* Don't grow or shrink, size based on content */
  padding: 1rem 1.5rem;
  background: var(--color-neutral-100);
  border: 2px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: var(--color-neutral-700);
  transition: all 0.2s ease;
  font-size: 1.1em;
  text-align: center;
  user-select: none;
  min-width: 150px; /* Ensure consistent minimum width */
}

.matrix-title:hover {
  background: var(--color-neutral-200);
  border-color: var(--color-primary-light);
  transform: translateY(-1px);
}

.matrix-title.active {
  background: var(--color-primary-light);
  color: white;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.matrix-title i.fas:first-child {
  margin-right: 0.5rem;
}

/* Matrix content area - single table display */
.matrix-content-area {
  position: relative;
  width: fit-content; /* Size to fit the content */
  margin: 0 auto; /* Center horizontally */
  min-height: 0; /* Remove min-height constraint */
}

.matrix-table-display {
  display: none; /* Hide by default */
  width: fit-content; /* Size to fit the table */
  margin: 0; /* Remove all margins */
  padding: 0; /* Remove all padding */
  background: transparent; /* Remove background */
  border: none; /* Remove border */
  border-radius: 0; /* Remove border radius */
  overflow: visible; /* Allow content to be fully visible */
  animation: fadeIn 0.3s ease-in-out;
}

.matrix-table-display.active {
  display: block; /* Show only the active matrix */
}

.matrix-table-display > .sim-section-title {
  display: none; /* Hide section titles since tab headers provide the labels */
}

.matrix-table-display table {
  margin: 0; /* Remove all table margins */
  border: none !important;
  box-shadow: none !important;
  width: auto; /* Let table size naturally */
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Override individual corpus section styles when inside combined section */
#corpus-combined-section #corpus-selection,
#corpus-combined-section #corpus-info {
  background: transparent;
  border: none;
  box-shadow: none;
  border-radius: 0;
}