:root {
  --primary-blue: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-blue: #eff6ff;
  --dark-blue: #1e3a8a;
  --darker-blue: #172554;
  --success-green: #22c55e;
  --success-hover: #16a34a;
  --success-light: #dcfce7;
  --warning-orange: #f97316;
  --warning-hover: #ea580c;
  --text-dark: #1f2937;
  --text-muted: #6b7280;
  --bg-light: #f3f4f6;
  --bg-white: #ffffff;
  --border-color: #e5e7eb;
  --border-radius: 8px;
  --transition: all 0.2s ease;
  --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-light);
  color: var(--text-dark);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Header */
header {
  background-color: #2B4570;
  color: white;
  padding: 15px 20px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
  color: white;
}

.logo-icon {
  background-color: white;
  color: #2B4570;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 1.05rem;
  font-weight: 900;
}

.subtitle {
  font-weight: 400;
  font-size: 0.9rem;
  opacity: 0.9;
}

nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

nav a {
  color: white;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: opacity 0.2s;
}

nav a:hover {
  opacity: 0.8;
}

/* Main Container */
.container {
  max-width: 1200px;
  margin: 28px auto;
  padding: 0 16px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.ad-container {
  margin: 8px 0;
}

/* Cards */
.card {
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  padding: 28px;
}

.page-intro h1 {
  font-size: 2rem;
  color: #2B4570;
  margin-bottom: 10px;
  text-align: center;
}

.page-intro p {
  color: #4b5563;
  max-width: 900px;
  margin: 0 auto 16px;
  text-align: center;
}

/* Two-Column Workspace Layout */
.tool-two-col {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(320px, 1fr);
  gap: 24px;
  align-items: start;
  margin-top: 12px;
}

.tool-main-col {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

.tool-settings-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 20px;
  position: sticky;
  top: 16px;
}

.option-group {
  margin: 0;
  padding: 16px;
  background-color: #fff;
  border-radius: 6px;
  border: 1px solid #e2e8f0;
}

.group-legend {
  font-size: 1.02rem;
  font-weight: 700;
  color: #2B4570;
  padding: 0 6px;
  margin-bottom: 6px;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 6px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border: none;
  border-radius: 6px;
  font-size: 0.94rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.btn:focus {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--primary-blue);
  color: white;
}

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

.btn-success {
  background-color: var(--success-green);
  color: white;
}

.btn-success:hover {
  background-color: var(--success-hover);
}

.btn-orange {
  background-color: var(--warning-orange);
  color: white;
  padding: 8px 14px;
  font-size: 0.88rem;
}

.btn-orange:hover {
  background-color: var(--warning-hover);
}

.btn-secondary {
  background-color: #4b5563;
  color: white;
  padding: 8px 12px;
  font-size: 0.84rem;
  width: 100%;
}

.btn-secondary:hover {
  background-color: #374151;
}

.mini-btn {
  padding: 6px 11px;
  font-size: 0.82rem;
  font-weight: 500;
  border-radius: 5px;
  background-color: #edf2f7;
  color: var(--text-dark);
  border: 1px solid #cbd5e1;
  cursor: pointer;
  transition: var(--transition);
}

.mini-btn:hover {
  background-color: #e2e8f0;
  border-color: var(--primary-blue);
}

.presets-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 10px 14px;
}

.presets-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: #475569;
  margin-right: 4px;
}

/* Password Display Box */
.password-display-area {
  background-color: #f8fafc;
  border: 2px solid #cbd5e1;
  border-radius: var(--border-radius);
  padding: 26px 48px;
  text-align: center;
  position: relative;
}

.password-text {
  font-size: 1.75rem;
  font-weight: 600;
  color: #15803d;
  word-break: break-all;
  letter-spacing: 1.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.nav-arrows {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: calc(100% - 16px);
  display: flex;
  justify-content: space-between;
  left: 8px;
  pointer-events: none;
}

.history-btn {
  pointer-events: auto;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #475569;
  transition: var(--transition);
}

.history-btn:hover:not(:disabled) {
  background-color: var(--primary-blue);
  color: #fff;
  border-color: var(--primary-blue);
}

.history-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.history-btn svg {
  width: 18px;
  height: 18px;
}

.action-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.action-buttons .btn {
  flex: 1;
  min-width: 180px;
}

/* Strength & Entropy Box */
.strength-container {
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 16px;
}

.strength-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 0.92rem;
}

.strength-label {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-dark);
  font-weight: 600;
}

.strength-value {
  font-weight: 700;
}

.entropy-metrics {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.entropy-metrics strong {
  color: var(--text-dark);
}

.strength-bar-bg {
  height: 6px;
  background-color: var(--border-color);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 12px;
}

.strength-bar-fill {
  height: 100%;
  width: 0%;
  transition: width 0.3s ease, background-color 0.3s ease;
}

.checklist {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 6px 12px;
}

.checklist li {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.84rem;
  color: var(--text-muted);
}

.checklist li.met {
  color: var(--success-green);
}

.checklist li svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* Settings Column Controls */
.length-control-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.length-slider-container {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.number-input-group {
  display: flex;
  align-items: center;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
  background: #fff;
}

.number-btn {
  background: var(--bg-light);
  border: none;
  padding: 7px 11px;
  cursor: pointer;
  color: var(--primary-blue);
  font-weight: bold;
  transition: var(--transition);
}

.number-btn:hover {
  background: #e5e7eb;
}

.number-input-group input[type="number"] {
  width: 52px;
  text-align: center;
  border: none;
  border-left: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  padding: 7px 4px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  -moz-appearance: textfield;
}

.number-input-group input[type="number"]::-webkit-outer-spin-button,
.number-input-group input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="range"] {
  flex-grow: 1;
  -webkit-appearance: none;
  height: 6px;
  background: #e5e7eb;
  border-radius: 5px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary-blue);
  cursor: pointer;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary-blue);
  cursor: pointer;
  border: none;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

/* Quick Length Chips */
.toc-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
}

.toc-link {
  display: inline-block;
  padding: 4px 9px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-dark);
  background-color: #f1f5f9;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  text-decoration: none;
  transition: var(--transition);
}

.toc-link:hover,
.toc-link.active {
  background-color: var(--primary-blue);
  color: #fff;
  border-color: var(--primary-blue);
}

.checkboxes-stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  cursor: pointer;
  font-size: 0.92rem;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  margin-top: 3px;
  width: 17px;
  height: 17px;
  accent-color: var(--primary-blue);
  cursor: pointer;
  flex-shrink: 0;
}

.help-text {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Notification Toast */
.notification {
  padding: 5px 12px;
  border-radius: 4px;
  font-size: 0.84rem;
  font-weight: 600;
  opacity: 0;
  transition: opacity 0.25s;
}

.notification.show {
  opacity: 1;
  background-color: var(--success-green);
  color: #fff;
}

.notification.error {
  opacity: 1;
  background-color: #ef4444;
  color: #fff;
}

/* Batch Generator */
.batch-section {
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
}

.batch-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.batch-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.batch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}

.batch-item {
  background-color: #f8fafc;
  border-radius: 6px;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.batch-password {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
  text-align: center;
  font-size: 0.98rem;
  word-break: break-all;
  padding: 6px 0;
  color: var(--text-dark);
}

/* Informational Content & Tables */
.tool-info-section {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.tool-info-section h2,
.faq-section h2,
.related-tools-section h2 {
  color: #2B4570;
  font-size: 1.5rem;
  margin: 1.5rem 0 0.85rem;
}

.tool-info-section h2:first-child {
  margin-top: 0;
}

.tool-info-section p {
  color: #4b5563;
  margin-bottom: 1rem;
}

.tool-info-section ul,
.tool-info-section ol {
  margin: 0 0 1.25rem 1.5rem;
  color: #4b5563;
}

.tool-info-section li {
  margin-bottom: 0.5rem;
}

.tool-info-section table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.92rem;
}

.tool-info-section th,
.tool-info-section td {
  border: 1px solid var(--border-color);
  padding: 10px 12px;
  text-align: left;
}

.tool-info-section thead th {
  background-color: #f0f4f8;
  color: #2B4570;
  font-weight: 700;
}

.tool-info-section tbody tr:nth-child(even) {
  background-color: #f9fafb;
}

.tool-info-section code {
  background-color: #f1f5f9;
  padding: 2px 5px;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
  font-size: 0.88rem;
}

/* FAQ Accordion */
.faq-section {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: 6px;
  margin-bottom: 10px;
  background-color: #fff;
  overflow: hidden;
}

.faq-item summary {
  padding: 14px 16px;
  font-weight: 600;
  color: #2B4570;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 1.2rem;
  font-weight: bold;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-answer {
  padding: 12px 16px 16px;
  color: #4b5563;
  border-top: 1px solid #f1f5f9;
}

/* Related Tools Grid */
.related-tools-section {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.tool-card {
  background-color: #fff;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  padding: 16px;
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 600;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.tool-card:hover {
  transform: translateY(-2px);
  border-color: var(--primary-blue);
  color: var(--primary-blue);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* Footer */
footer {
  background-color: #2B4570;
  color: white;
  padding: 32px 20px 20px;
  margin-top: 40px;
  text-align: center;
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
  margin-bottom: 12px;
  color: rgba(255, 255, 255, 0.75);
}

.footer-links a {
  color: white;
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

.copyright {
  color: rgba(255, 255, 255, 0.8);
  margin-top: 12px;
}

svg {
  fill: currentColor;
}

@media (max-width: 920px) {
  .tool-two-col {
    grid-template-columns: 1fr;
  }

  .tool-settings-col {
    position: static;
  }
}

@media (max-width: 640px) {
  .card {
    padding: 18px;
  }

  .password-display-area {
    padding: 22px 40px;
  }

  .password-text {
    font-size: 1.35rem;
  }

  .action-buttons {
    flex-direction: column;
  }
}