/* =============================================
   CodeToFun — Duplicate Word Finder Tool Page
   Self-contained, mobile-first responsive CSS
   ============================================= */

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  color: #1e293b;
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

/* --- Utilities --- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* --- Buttons (header nav) --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.938rem;
  border-radius: 0.5rem;
  padding: 0.625rem 1.5rem;
  transition: all 0.2s ease;
  text-decoration: none;
  border: none;
  cursor: pointer;
  line-height: 1.4;
}

a.btn-primary,
button.btn-primary,
.btn-primary {
  background: #2563eb;
  color: #fff;
}

a.btn-primary:hover,
button.btn-primary:hover,
.btn-primary:hover {
  background: #1d4ed8;
  color: #fff;
}

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
}

/* =====================
   HEADER
   ===================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid #e2e8f0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  background: #2563eb;
  padding: 0.5rem;
  border-radius: 0.5rem;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: #0f172a;
}

.logo-tagline {
  font-size: 0.75rem;
  color: #64748b;
}

.desktop-nav {
  display: none;
  align-items: center;
  gap: 2rem;
}

.desktop-nav a:not(.btn) {
  color: #475569;
  font-weight: 500;
  font-size: 0.938rem;
  transition: color 0.2s;
}

.desktop-nav a:not(.btn):hover {
  color: #2563eb;
}

.desktop-nav .btn-primary,
.mobile-nav .btn-primary {
  background: #2563eb;
  color: #fff;
}

.desktop-nav .btn-primary:hover,
.mobile-nav .btn-primary:hover {
  background: #1d4ed8;
  color: #fff;
}

.mobile-menu-btn {
  display: flex;
  padding: 0.5rem;
  color: #475569;
}

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 1rem;
  padding: 1rem;
  border-top: 1px solid #e2e8f0;
  background: #fff;
}

.mobile-nav.open {
  display: flex;
}

.mobile-nav a:not(.btn) {
  color: #475569;
  font-weight: 500;
  font-size: 0.938rem;
  transition: color 0.2s;
}

.mobile-nav a:not(.btn):hover {
  color: #2563eb;
}

/* =====================
   FOOTER
   ===================== */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 3rem 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  color: #94a3b8;
  line-height: 1.6;
  margin: 1rem 0 1.5rem;
}

.footer-brand .logo-name { color: #fff; }
.footer-brand .logo-tagline { color: #94a3b8; }

.follow-heading {
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.social-links {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.social-links a {
  background: #1e293b;
  padding: 0.625rem;
  border-radius: 0.5rem;
  transition: background 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.social-links a:hover { background: #334155; }

.trusted-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #1e293b;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  border: 1px solid #334155;
}

.trusted-badge .dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: #3b82f6;
}

.footer-links-col h4 {
  color: #fff;
  font-size: 0.938rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.footer-links-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links-col a {
  font-size: 0.875rem;
  transition: color 0.2s;
}

.footer-links-col a:hover { color: #60a5fa; }

.footer-all-links ul {
  columns: 2;
  column-gap: 1.5rem;
}

.footer-all-links li { break-inside: avoid; }

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding: 2rem 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.875rem;
  color: #94a3b8;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
  justify-content: center;
}

.heart-icon { vertical-align: middle; }

.footer-legal-links {
  display: flex;
  gap: 1.5rem;
  font-size: 0.875rem;
}

.footer-legal-links a { transition: color 0.2s; }
.footer-legal-links a:hover { color: #60a5fa; }

/* =====================
   COOKIE NOTICE
   ===================== */
.cookie-notice {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: #0f172a;
  color: #cbd5e1;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: center;
  z-index: 200;
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.15);
}

.cookie-notice p {
  font-size: 0.813rem;
  text-align: center;
  line-height: 1.5;
}

.cookie-notice a:not(.btn) {
  color: #60a5fa;
  text-decoration: underline;
}

.cookie-notice .btn-primary { background: #2563eb; color: #fff; }
.cookie-notice .btn-primary:hover { background: #1d4ed8; color: #fff; }

/* =============================================
   TOOL PAGE — Duplicate Word Finder
   ============================================= */

.tool-page {
  background: linear-gradient(135deg, #eff6ff, #e0e7ff);
  min-height: 100vh;
}

/* --- Page Header --- */
.tool-page-header {
  text-align: center;
  padding: 2rem 0 1.5rem;
}

.tool-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #dbeafe;
  color: #1d4ed8;
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.tool-badge svg { width: 1rem; height: 1rem; }

.tool-page-header h1 {
  font-size: 2rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 0.75rem;
}

.tool-page-header p {
  font-size: 1rem;
  color: #475569;
  max-width: 48rem;
  margin: 0 auto;
  line-height: 1.7;
}

/* --- Main Tool Container --- */
.tool-container {
  background: #fff;
  border-radius: 1rem;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
  border: 1px solid #e2e8f0;
  overflow: hidden;
  margin-bottom: 2rem;
}

/* --- Toolbar --- */
.tool-toolbar {
  background: #f8fafc;
  border-bottom: 1px solid #e2e8f0;
  padding: 1rem;
}

.toolbar-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.toolbar-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.813rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  color: #fff;
  white-space: nowrap;
}

.toolbar-btn svg { width: 1rem; height: 1rem; flex-shrink: 0; }

.toolbar-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.toolbar-btn.tb-copy { background: #16a34a; }
.toolbar-btn.tb-copy:hover:not(:disabled) { background: #15803d; }
.toolbar-btn.tb-copy.copied { background: #16a34a; }

.toolbar-btn.tb-download { background: #4f46e5; }
.toolbar-btn.tb-download:hover:not(:disabled) { background: #4338ca; }

.toolbar-btn.tb-clear { background: #dc2626; }
.toolbar-btn.tb-clear:hover { background: #b91c1c; }

/* --- Settings Bar --- */
.settings-bar {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid #e2e8f0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
}

.setting-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.setting-group label {
  font-size: 0.813rem;
  font-weight: 600;
  color: #334155;
  white-space: nowrap;
}

.setting-group input[type="number"] {
  width: 4.5rem;
  padding: 0.375rem 0.5rem;
  border: 1px solid #cbd5e1;
  border-radius: 0.5rem;
  font-size: 0.813rem;
  font-family: inherit;
  color: #1e293b;
  outline: none;
  transition: border-color 0.2s;
}

.setting-group input[type="number"]:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
}

.settings-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.813rem;
  color: #334155;
  font-weight: 500;
}

.settings-label input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  accent-color: #2563eb;
  cursor: pointer;
}

/* --- Main Content Panels --- */
.panels {
  display: grid;
  grid-template-columns: 1fr;
}

.panel {
  border-bottom: 1px solid #e2e8f0;
}

.panel:last-child { border-bottom: none; }

.panel-header {
  background: #f1f5f9;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #e2e8f0;
}

.panel-header h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: #0f172a;
}

.panel-header .dup-count {
  font-weight: 400;
  color: #64748b;
}

/* Input panel */
.input-panel textarea {
  width: 100%;
  min-height: 18rem;
  padding: 1rem;
  border: none;
  resize: vertical;
  font-family: "Courier New", Courier, monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  color: #1e293b;
  background: #fff;
  outline: none;
}

.input-panel textarea::placeholder { color: #94a3b8; }

/* Stats bar below textarea */
.input-stats {
  background: #f8fafc;
  padding: 0.75rem 1rem;
  border-top: 1px solid #e2e8f0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: #64748b;
}

.input-stats .separator { color: #cbd5e1; }
.input-stats strong { color: #2563eb; font-weight: 700; }

/* Results panel */
.results-panel {
  display: flex;
  flex-direction: column;
}

.results-list {
  flex: 1;
  overflow-y: auto;
  max-height: 22rem;
  background: #f8fafc;
}

/* Empty state */
.results-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 12rem;
  padding: 2rem;
  text-align: center;
}

.results-empty svg {
  width: 3rem;
  height: 3rem;
  color: #cbd5e1;
  margin-bottom: 0.75rem;
}

.results-empty p {
  font-size: 0.875rem;
  color: #94a3b8;
}

/* Duplicate word cards */
.results-items { padding: 1rem; }

.dup-card {
  background: #fff;
  border-radius: 0.5rem;
  padding: 1rem;
  border: 1px solid #e2e8f0;
  transition: border-color 0.2s;
  margin-bottom: 0.5rem;
}

.dup-card:last-child { margin-bottom: 0; }
.dup-card:hover { border-color: #93c5fd; }

.dup-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.dup-card-top .dup-word {
  font-family: "Courier New", Courier, monospace;
  font-weight: 700;
  font-size: 1.063rem;
  color: #0f172a;
}

.dup-card-top .dup-badge {
  background: #fee2e2;
  color: #b91c1c;
  font-size: 0.688rem;
  font-weight: 700;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  white-space: nowrap;
}

/* Frequency bars (count <= 10) */
.freq-bars {
  display: flex;
  gap: 0.25rem;
  align-items: center;
}

.freq-bar {
  width: 2rem;
  height: 0.5rem;
  background: #facc15;
  border-radius: 0.125rem;
}

/* Progress bar (count > 10) */
.freq-progress { margin-top: 0.5rem; }

.freq-progress-track {
  width: 100%;
  height: 0.5rem;
  background: #e2e8f0;
  border-radius: 9999px;
  overflow: hidden;
}

.freq-progress-fill {
  height: 100%;
  background: #facc15;
  border-radius: 9999px;
  transition: width 0.3s ease;
}

.freq-progress-label {
  font-size: 0.688rem;
  color: #94a3b8;
  margin-top: 0.25rem;
}

/* --- Summary Bar --- */
.summary-bar {
  display: none;
  background: #eff6ff;
  border-top: 1px solid #bfdbfe;
  padding: 1rem 1.5rem;
  align-items: center;
  gap: 0.5rem;
  color: #1e3a5f;
  font-size: 0.875rem;
}

.summary-bar.visible { display: flex; }

.summary-bar svg { width: 1.25rem; height: 1.25rem; flex-shrink: 0; }

.summary-bar strong { font-weight: 700; }
.summary-bar .summary-label { font-weight: 600; }

/* --- Features Section --- */
.tool-features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 2rem;
}

.tool-feature-card {
  background: #fff;
  border-radius: 0.75rem;
  padding: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  border: 1px solid #e2e8f0;
}

.tool-feature-icon {
  width: 3rem;
  height: 3rem;
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.tool-feature-icon svg { width: 1.5rem; height: 1.5rem; }

.tool-feature-icon.feat-blue { background: #dbeafe; color: #2563eb; }
.tool-feature-icon.feat-green { background: #dcfce7; color: #16a34a; }
.tool-feature-icon.feat-purple { background: #f3e8ff; color: #9333ea; }

.tool-feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 0.5rem;
}

.tool-feature-card p {
  font-size: 0.875rem;
  color: #475569;
  line-height: 1.6;
}

/* --- How to Use Section --- */
.how-to-use {
  background: #fff;
  border-radius: 0.75rem;
  padding: 2rem 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  border: 1px solid #e2e8f0;
  margin-bottom: 2rem;
}

.how-to-use h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 1.5rem;
}

.how-to-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.how-to-grid h3 {
  font-size: 1rem;
  font-weight: 600;
  color: #0f172a;
  margin-bottom: 0.75rem;
}

.quick-steps {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.quick-steps li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: #334155;
  font-size: 0.938rem;
  line-height: 1.5;
}

.step-number {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  background: #2563eb;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  margin-top: 0.125rem;
}

.feature-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.feature-list li {
  font-size: 0.875rem;
  color: #334155;
  line-height: 1.5;
}

.feature-list strong { color: #0f172a; }

/* --- Use Cases Section --- */
.use-cases {
  background: #fff;
  border-radius: 0.75rem;
  padding: 2rem 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  border: 1px solid #e2e8f0;
  margin-bottom: 2rem;
}

.use-cases h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 1.5rem;
}

.use-cases-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.use-case-card {
  padding: 1rem;
  border-radius: 0.5rem;
  border: 1px solid;
}

.use-case-card h4 {
  font-size: 0.938rem;
  font-weight: 600;
  color: #0f172a;
  margin-bottom: 0.375rem;
}

.use-case-card p {
  font-size: 0.813rem;
  color: #475569;
}

.uc-blue { background: #eff6ff; border-color: #bfdbfe; }
.uc-green { background: #f0fdf4; border-color: #bbf7d0; }
.uc-purple { background: #faf5ff; border-color: #e9d5ff; }
.uc-orange { background: #fff7ed; border-color: #fed7aa; }

/* --- Stop Words Info Section --- */
.stop-words-info {
  background: linear-gradient(135deg, #eff6ff, #e0e7ff);
  border-radius: 0.75rem;
  padding: 2rem 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  border: 1px solid #bfdbfe;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.stop-words-icon {
  flex-shrink: 0;
  width: 3rem;
  height: 3rem;
  background: #2563eb;
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.stop-words-icon svg { width: 1.5rem; height: 1.5rem; }

.stop-words-info h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 0.75rem;
}

.stop-words-info p {
  font-size: 0.875rem;
  color: #334155;
  line-height: 1.6;
}

.stop-words-box {
  background: #fff;
  border-radius: 0.5rem;
  padding: 1rem;
  border: 1px solid #bfdbfe;
  margin: 0.75rem 0;
}

.stop-words-box p {
  font-family: "Courier New", Courier, monospace;
  font-size: 0.813rem;
  color: #475569;
  line-height: 1.8;
}

.stop-words-info .tip {
  font-size: 0.813rem;
  color: #475569;
}

/* =============================================
   RESPONSIVE — Tablet (640px+)
   ============================================= */
@media (min-width: 640px) {
  .container { padding: 0 1.5rem; }

  .cookie-notice {
    flex-direction: row;
    justify-content: center;
  }

  .tool-page-header h1 { font-size: 2.5rem; }

  .tool-toolbar { padding: 1rem 1.5rem; }

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

  .how-to-use { padding: 2.5rem; }
  .how-to-grid { grid-template-columns: 1fr 1fr; }

  .use-cases { padding: 2.5rem; }
  .use-cases-grid { grid-template-columns: repeat(2, 1fr); }

  .stop-words-info {
    flex-direction: row;
    padding: 2.5rem;
    gap: 1.5rem;
  }
}

/* =============================================
   RESPONSIVE — Desktop (768px+)
   ============================================= */
@media (min-width: 768px) {
  .container { padding: 0 2rem; }

  .desktop-nav { display: flex; }
  .mobile-menu-btn { display: none; }

  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .tool-page-header { padding: 2.5rem 0 2rem; }

  .panels { grid-template-columns: 1fr 1fr; }
  .panel { border-bottom: none; }
  .input-panel { border-right: 1px solid #e2e8f0; }
  .input-panel textarea { min-height: 22rem; }
  .results-list { max-height: 26rem; }
}

/* =============================================
   RESPONSIVE — Large Desktop (1024px+)
   ============================================= */
@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 2fr 1fr 1fr;
    gap: 2rem;
  }
  .footer-brand { grid-column: auto; }
  .footer-all-links ul { columns: 3; }

  .tool-page-header h1 { font-size: 2.75rem; }
  .tool-page-header p { font-size: 1.125rem; }

  .how-to-use h2 { font-size: 1.75rem; }
  .use-cases h2 { font-size: 1.75rem; }

  .use-cases-grid { grid-template-columns: repeat(4, 1fr); }
}