/* ===== WRAPPER & TYPOGRAPHY ===== */
.word-density-wrapper {
  max-width: 900px;
  margin: 0 auto;
  padding: 30px 20px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  color: #1a1a2e;
}

.wd-title {
  font-size: 1.75rem;
  font-weight: 700;
  text-align: center;
  margin: 0 0 6px;
  color: #1a1a2e;
}

.wd-subtitle {
  text-align: center;
  color: #666;
  margin: 0 0 24px;
  font-size: 0.95rem;
}

/* ===== FORM ===== */
#density-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.wd-textarea-wrap {
  position: relative;
}

#text-input {
  width: 100%;
  height: 220px;
  padding: 16px;
  border: 2px solid #e0e0e0;
  border-radius: 10px;
  font-size: 0.95rem;
  font-family: inherit;
  resize: vertical;
  transition: border-color 0.25s, box-shadow 0.25s;
  box-sizing: border-box;
  background: #fafafa;
  color: #1a1a2e;
}

#text-input:focus {
  outline: none;
  border-color: #4361ee;
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
  background: #fff;
}

.wd-char-count {
  position: absolute;
  bottom: 10px;
  right: 14px;
  font-size: 0.75rem;
  color: #999;
  pointer-events: none;
}

/* ===== RADIO GROUP ===== */
.wd-grouping-section {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.wd-grouping-label {
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
}

.wd-radio-group {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.wd-radio {
  cursor: pointer;
}

.wd-radio input[type="radio"] {
  display: none;
}

.wd-radio span {
  display: inline-block;
  padding: 7px 16px;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s;
  color: #555;
  background: #fff;
}

.wd-radio input[type="radio"]:checked + span {
  background: #4361ee;
  color: #fff;
  border-color: #4361ee;
}

.wd-radio:hover span {
  border-color: #4361ee;
}

/* ===== OPTIONS ROW ===== */
.wd-options-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.wd-checkbox {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  cursor: pointer;
  color: #444;
}

.wd-checkbox input[type="checkbox"] {
  accent-color: #4361ee;
  width: 16px;
  height: 16px;
}

.wd-min-count {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: #444;
}

.wd-min-count input[type="number"] {
  width: 60px;
  padding: 6px 8px;
  border: 2px solid #e0e0e0;
  border-radius: 6px;
  font-size: 0.85rem;
  text-align: center;
  font-family: inherit;
}

.wd-min-count input[type="number"]:focus {
  outline: none;
  border-color: #4361ee;
}

/* ===== SUBMIT BUTTON ===== */
#submit-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 32px;
  background: linear-gradient(135deg, #4361ee, #3a56d4);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.25s;
  align-self: center;
  font-family: inherit;
}

#submit-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(67, 97, 238, 0.35);
}

#submit-button:active {
  transform: translateY(0);
}

/* ===== STATS BAR ===== */
.wd-stats-bar {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.wd-stat {
  background: #f0f4ff;
  border-radius: 10px;
  padding: 14px 24px;
  text-align: center;
  flex: 1;
  min-width: 120px;
}

.wd-stat strong {
  display: block;
  font-size: 1.5rem;
  color: #4361ee;
}

.wd-stat span {
  font-size: 0.78rem;
  color: #666;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ===== TABLE CONTROLS ===== */
.wd-table-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

#filter-input {
  flex: 1;
  min-width: 180px;
  padding: 9px 14px;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  font-size: 0.88rem;
  font-family: inherit;
}

#filter-input:focus {
  outline: none;
  border-color: #4361ee;
}

.wd-btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  background: #fff;
  color: #4361ee;
  border: 2px solid #4361ee;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.wd-btn-secondary:hover {
  background: #4361ee;
  color: #fff;
}

/* ===== TABLE ===== */
.wd-table-wrap {
  overflow-x: auto;
  border-radius: 10px;
  border: 1px solid #e0e0e0;
}

#result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

#result-table thead {
  background: #f5f7ff;
}

#result-table th {
  padding: 12px 14px;
  text-align: left;
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #555;
  border-bottom: 2px solid #e0e0e0;
  white-space: nowrap;
  user-select: none;
}

#result-table th.sortable {
  cursor: pointer;
  transition: color 0.2s;
}

#result-table th.sortable:hover,
#result-table th.active-sort {
  color: #4361ee;
}

.sort-icon {
  font-size: 0.7rem;
  margin-left: 3px;
}

#result-table td {
  padding: 10px 14px;
  border-bottom: 1px solid #f0f0f0;
  color: #333;
}

#result-table tbody tr {
  transition: background 0.15s;
}

#result-table tbody tr:hover {
  background: #f5f7ff;
}

.wd-th-rank {
  width: 40px;
  text-align: center !important;
}

#result-table td:first-child {
  text-align: center;
  color: #999;
  font-weight: 600;
  font-size: 0.82rem;
}

.wd-th-bar {
  width: 150px;
}

.wd-density-bar {
  background: #e8ecff;
  border-radius: 6px;
  height: 10px;
  overflow: hidden;
  min-width: 100px;
}

.wd-density-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #4361ee, #7b8cff);
  border-radius: 6px;
  transition: width 0.4s ease;
}

/* ===== PAGINATION ===== */
.wd-pagination {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.wd-pagination button {
  padding: 7px 13px;
  border: 2px solid #e0e0e0;
  background: #fff;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  font-family: inherit;
  transition: all 0.2s;
  color: #555;
}

.wd-pagination button:hover {
  border-color: #4361ee;
  color: #4361ee;
}

.wd-pagination button.active {
  background: #4361ee;
  color: #fff;
  border-color: #4361ee;
}

/* ===== EMPTY STATE ===== */
.wd-empty-state {
  text-align: center;
  padding: 40px 20px;
  color: #999;
  font-size: 0.95rem;
}

/* ===== RESULTS SECTION ===== */
.wd-results-section {
  margin-top: 30px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  .word-density-wrapper {
    padding: 16px 10px;
  }

  #text-input {
    height: 160px;
    font-size: 0.88rem;
  }

  .wd-grouping-section {
    flex-direction: column;
    align-items: flex-start;
  }

  .wd-radio span {
    padding: 6px 12px;
    font-size: 0.8rem;
  }

  .wd-stats-bar {
    gap: 8px;
  }

  .wd-stat {
    padding: 10px 14px;
  }

  .wd-stat strong {
    font-size: 1.2rem;
  }

  .wd-th-bar,
  .wd-density-bar {
    display: none;
  }

  #submit-button {
    width: 100%;
  }
}