:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --success: #16a34a;
  --warning: #f59e0b;
  --danger: #dc2626;
  --dark: #111827;
  --text: #374151;
  --muted: #6b7280;
  --light: #f9fafb;
  --soft: #f3f6fb;
  --border: #e5e7eb;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--light);
  color: var(--text);
  font-family: Lato, Arial, sans-serif;
  line-height: 1.6;
}

.wk-header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
}

.wk-logo {
  display: flex;
  justify-content: center;
}

.wk-logo img {
  display: block;
  max-width: 210px;
  height: auto;
}

.ai-detector-page .container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.tool-hero {
  background: linear-gradient(180deg, #ffffff 0%, #eef5ff 100%);
  padding: 54px 0 34px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--primary);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
  font-size: 13px;
}

.tool-hero h1 {
  margin: 0;
  color: var(--dark);
  font-size: 42px;
  line-height: 1.15;
  font-weight: 800;
}

.hero-intro {
  max-width: 820px;
  margin: 18px auto 0;
  color: var(--text);
  font-size: 18px;
}

.hero-note {
  max-width: 760px;
  margin: 14px auto 0;
  color: var(--muted);
  font-size: 15px;
}

.tool-area {
  padding: 34px 0 12px;
}

.detector-card,
.analysis-card,
.score-card,
.summary-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 12px 34px rgba(17, 24, 39, 0.06);
}

.detector-card {
  padding: 24px;
}

.input-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 16px;
}

.input-head h2,
.section-title h2,
.content-section h2 {
  margin: 0;
  color: var(--dark);
  line-height: 1.25;
}

.input-head h2 {
  font-size: 24px;
}

.input-head p {
  margin: 6px 0 0;
  color: var(--muted);
}

.privacy-note {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 360px;
  background: #eef6ff;
  color: #1e40af;
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 14px;
}

#contentInput {
  display: block;
  width: 100%;
  min-height: 260px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  color: var(--dark);
  background: var(--white);
  font: inherit;
  outline: none;
}

#contentInput:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.live-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
}

.tool-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

button {
  border: 0;
  cursor: pointer;
  font: inherit;
}

.btn-main,
.btn-soft,
.btn-mini {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 8px;
  min-height: 44px;
  padding: 10px 16px;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-main {
  background: var(--primary);
  color: var(--white);
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.22);
}

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

.btn-soft,
.btn-mini {
  background: var(--soft);
  color: var(--dark);
  border: 1px solid var(--border);
}

.btn-main:hover,
.btn-soft:hover,
.btn-mini:hover {
  transform: translateY(-1px);
}

.btn-mini {
  min-height: 36px;
  padding: 8px 12px;
  font-size: 14px;
}

.error-message {
  margin-top: 14px;
  padding: 12px 14px;
  border: 1px solid #fecaca;
  border-radius: 8px;
  background: #fef2f2;
  color: #991b1b;
  font-weight: 700;
}

.results-section {
  margin-top: 24px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.summary-card {
  padding: 20px;
}

.summary-card span {
  display: block;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 8px;
}

.summary-card strong {
  display: block;
  color: var(--dark);
  font-size: 26px;
  line-height: 1.15;
}

.score-card {
  margin-top: 16px;
  padding: 20px;
}

.score-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
  color: var(--dark);
}

.score-track {
  width: 100%;
  height: 18px;
  overflow: hidden;
  background: #edf2f7;
  border-radius: 999px;
}

.score-bar {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--success);
  transition: width 0.35s ease, background 0.35s ease;
}

.analysis-wrap {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 16px;
  margin-top: 16px;
}

.analysis-card {
  padding: 22px;
  margin-top: 16px;
}

.analysis-wrap .analysis-card {
  margin-top: 0;
}

.section-title {
  margin-bottom: 16px;
}

.section-help {
  color: var(--muted);
  font-size: 14px;
  margin: 6px 0 0;
}

.section-title.split {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.metric {
  background: var(--light);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 13px;
}

.metric span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 5px;
}

.metric strong {
  display: block;
  color: var(--dark);
  font-size: 18px;
}

.reason-list {
  margin: 0;
  padding-left: 20px;
}

.reason-list li {
  margin-bottom: 10px;
}

.paragraph-risks {
  display: grid;
  gap: 12px;
}

.paragraph-risk {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  background: var(--light);
}

.paragraph-risk strong {
  color: var(--dark);
}

.content-highlights {
  display: grid;
  gap: 14px;
}

.highlight-block {
  border: 1px solid var(--border);
  border-left-width: 5px;
  border-radius: 8px;
  background: var(--white);
  padding: 14px;
}

.highlight-block.low {
  border-left-color: var(--success);
  background: #f0fdf4;
}

.highlight-block.medium {
  border-left-color: var(--warning);
  background: #fffbeb;
}

.highlight-block.high {
  border-left-color: var(--danger);
  background: #fef2f2;
}

.highlight-meta {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: space-between;
  margin-bottom: 8px;
}

.highlight-meta strong {
  color: var(--dark);
}

.highlight-text {
  color: var(--text);
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.highlight-reasons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.reason-chip {
  background: rgba(17, 24, 39, 0.06);
  border-radius: 999px;
  color: var(--dark);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 9px;
}

.risk-badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 4px 10px;
  margin-left: 8px;
  color: var(--white);
  font-size: 12px;
  font-weight: 700;
}

.risk-low {
  background: var(--success);
}

.risk-medium {
  background: var(--warning);
}

.risk-high {
  background: var(--danger);
}

.content-section {
  padding: 28px 0 54px;
}

.content-section .container {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 28px;
}

.content-section h2 {
  margin-top: 24px;
  font-size: 24px;
}

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

.content-section p {
  margin: 10px 0 0;
}

.bottom-disclaimer {
  background: #fff7ed;
  border: 1px solid #fed7aa;
  border-radius: 8px;
  color: #9a3412;
  padding: 14px;
}

.related-tool a {
  color: var(--primary);
  font-weight: 700;
}

.wk-footer {
  background: var(--dark);
  color: #d1d5db;
  text-align: center;
  padding: 20px 0;
}

.wk-footer p {
  margin: 0;
}

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 900px) {
  .summary-grid,
  .analysis-wrap {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .analysis-wrap {
    display: block;
  }

  .analysis-wrap .analysis-card + .analysis-card {
    margin-top: 16px;
  }
}

@media (max-width: 640px) {
  .tool-hero {
    padding: 38px 0 26px;
  }

  .tool-hero h1 {
    font-size: 32px;
  }

  .hero-intro {
    font-size: 16px;
  }

  .detector-card,
  .analysis-card,
  .content-section .container {
    padding: 18px;
  }

  .input-head,
  .section-title.split,
  .score-label {
    display: block;
  }

  .privacy-note {
    margin-top: 12px;
    max-width: 100%;
  }

  .tool-actions,
  .summary-grid,
  .metric-grid {
    display: grid;
    grid-template-columns: 1fr;
  }

  .btn-main,
  .btn-soft {
    width: 100%;
  }

  .btn-mini {
    margin-top: 10px;
    width: 100%;
  }
}