/* AI Text Watermark Detector - Premium SaaS Styles */

:root {
  --navy: #0f172a;
  --navy-800: #1e293b;
  --navy-700: #334155;
  --navy-600: #475569;
  --blue: #3b82f6;
  --blue-600: #2563eb;
  --blue-500: #3b82f6;
  --blue-400: #60a5fa;
  --indigo: #6366f1;
  --indigo-500: #6366f1;
  --purple: #8b5cf6;
  --green: #10b981;
  --green-600: #059669;
  --amber: #f59e0b;
  --amber-600: #d97706;
  --red: #ef4444;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --white: #ffffff;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', ui-monospace, monospace;
}

[data-theme="dark"] {
  --bg: #0b1120;
  --bg-card: #111827;
  --bg-elevated: #1f2937;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --border: #1e293b;
  --border-hover: #334155;
}

[data-theme="light"], :root {
  --bg: #ffffff;
  --bg-card: #ffffff;
  --bg-elevated: #f8fafc;
  --text: #0f172a;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

img, svg {
  display: block;
  max-width: 100%;
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.025em;
  color: var(--text);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  color: var(--text-secondary);
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-narrow {
  max-width: 800px;
}

.container-wide {
  max-width: 1280px;
}

/* Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background 0.2s ease;
}

[data-theme="dark"] .navbar {
  background: rgba(11, 17, 32, 0.85);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text);
  white-space: nowrap;
}

.logo-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  padding: 0.5rem 0.875rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color 0.15s ease, background 0.15s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
  background: var(--gray-100);
}

[data-theme="dark"] .nav-link:hover,
[data-theme="dark"] .nav-link.active {
  background: var(--navy-800);
}

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

.nav-docs {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.5rem 0.75rem;
}

.nav-docs:hover {
  color: var(--text);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
  line-height: 1.25;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--navy-800);
  border-color: var(--navy-800);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--gray-50);
  border-color: var(--border-hover);
}

[data-theme="dark"] .btn-secondary:hover:not(:disabled) {
  background: var(--navy-800);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: none;
  padding: 0.5rem 0.75rem;
}

.btn-ghost:hover {
  color: var(--text);
  background: var(--gray-100);
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
  border-radius: var(--radius);
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
}

.btn-icon {
  padding: 0.5rem;
  border-radius: var(--radius-sm);
}

/* Mobile menu */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--text);
}

.mobile-menu {
  display: none;
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem 1.5rem;
  flex-direction: column;
  gap: 0.25rem;
  box-shadow: var(--shadow-lg);
}

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

.mobile-menu .nav-link {
  padding: 0.75rem 1rem;
  font-size: 1rem;
}

/* Hero */
.hero {
  padding: 4rem 0 3rem;
  text-align: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.875rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--blue-600);
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.15);
  border-radius: 9999px;
  margin-bottom: 1.5rem;
}

[data-theme="dark"] .badge {
  color: var(--blue-400);
  background: rgba(59, 130, 246, 0.12);
  border-color: rgba(59, 130, 246, 0.2);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  color: var(--text);
}

.hero-sub {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.trust-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem 2rem;
  flex-wrap: wrap;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.trust-item svg {
  width: 16px;
  height: 16px;
  color: var(--green);
  flex-shrink: 0;
}

/* Detector Section */
.detector-section {
  padding: 0 0 4rem;
}

.detector-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.detector-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 520px;
}

.detector-input-panel {
  padding: 1.5rem;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.detector-results-panel {
  padding: 1.5rem;
  background: var(--bg-elevated);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  max-height: 700px;
}

.panel-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.textarea-wrapper {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
}

#text-input {
  width: 100%;
  flex: 1;
  min-height: 280px;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  font-size: 0.9375rem;
  line-height: 1.6;
  resize: vertical;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

#text-input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

#text-input::placeholder {
  color: var(--gray-400);
}

.input-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
  gap: 0.5rem;
}

.counts {
  display: flex;
  gap: 1rem;
}

.input-actions {
  display: flex;
  gap: 0.5rem;
}

.sample-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.sample-label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.sample-btn {
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 9999px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.sample-btn:hover {
  border-color: var(--blue);
  color: var(--blue);
  background: rgba(59, 130, 246, 0.05);
}

.warning-text {
  font-size: 0.8125rem;
  color: var(--amber-600);
  margin-top: 0.75rem;
  display: flex;
  align-items: flex-start;
  gap: 0.375rem;
}

.analyze-btn-row {
  margin-top: 1.25rem;
}

.analyze-btn {
  width: 100%;
  padding: 0.875rem;
  font-size: 1rem;
  font-weight: 600;
}

/* Loading */
.loading-state {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  gap: 1rem;
  text-align: center;
  padding: 2rem;
}

.loading-state.active {
  display: flex;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Empty results */
.empty-results {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  text-align: center;
  padding: 2rem;
  color: var(--text-secondary);
}

.empty-results svg {
  width: 48px;
  height: 48px;
  margin-bottom: 1rem;
  opacity: 0.4;
}

.empty-results p {
  font-size: 0.9375rem;
  max-width: 260px;
}

/* Results */
.results-content {
  display: none;
  flex-direction: column;
  gap: 1.25rem;
}

.results-content.active {
  display: flex;
}

.result-status-card {
  padding: 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.status-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.status-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status-indicator.detected { background: var(--green); box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2); }
.status-indicator.not-detected { background: var(--gray-400); box-shadow: 0 0 0 3px rgba(148, 163, 184, 0.2); }
.status-indicator.uncertain { background: var(--amber); box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2); }
.status-indicator.error { background: var(--red); box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2); }

.status-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text);
}

.status-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Confidence */
.confidence-section {
  padding: 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.confidence-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.confidence-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.confidence-bar {
  height: 8px;
  background: var(--gray-200);
  border-radius: 9999px;
  overflow: hidden;
  margin-bottom: 0.75rem;
}

[data-theme="dark"] .confidence-bar {
  background: var(--navy-800);
}

.confidence-fill {
  height: 100%;
  border-radius: 9999px;
  background: linear-gradient(90deg, var(--blue), var(--indigo));
  transition: width 0.6s ease;
}

.confidence-note {
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Signal cards */
.signals-section h4,
.likelihood-section h4,
.overall-section h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.signal-card {
  padding: 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  margin-bottom: 0.5rem;
}

.signal-card:last-child {
  margin-bottom: 0;
}

.signal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.375rem;
}

.signal-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}

.signal-status {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
}

.signal-status.detected {
  background: rgba(16, 185, 129, 0.12);
  color: var(--green-600);
}

.signal-status.not-detected {
  background: var(--gray-100);
  color: var(--gray-600);
}

.signal-status.uncertain {
  background: rgba(245, 158, 11, 0.12);
  color: var(--amber-600);
}

.signal-status.coming-soon,
.signal-status.unsupported {
  background: rgba(99, 102, 241, 0.1);
  color: var(--indigo);
}

[data-theme="dark"] .signal-status.not-detected {
  background: var(--navy-800);
  color: var(--gray-400);
}

.signal-meta {
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Likelihood */
.likelihood-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.metric-card {
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.metric-label {
  font-size: 0.6875rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.metric-value {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
}

.likelihood-note {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: rgba(59, 130, 246, 0.05);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(59, 130, 246, 0.1);
  line-height: 1.5;
}

/* Overall */
.overall-card {
  padding: 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.overall-summary {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.75rem;
}

.overall-details {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.overall-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Sections common */
.section {
  padding: 4rem 0;
}

.section-alt {
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  margin-bottom: 0.75rem;
}

.section-header p {
  max-width: 560px;
  margin: 0 auto;
  font-size: 1.0625rem;
}

/* Cards grid */
.cards-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  padding: 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-hover);
}

.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(59, 130, 246, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  color: var(--blue);
}

.feature-card h3 {
  font-size: 1.0625rem;
  margin-bottom: 0.5rem;
}

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

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  counter-reset: step;
}

.step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--navy);
  color: white;
  font-weight: 700;
  font-size: 1.125rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
}

.step h3 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.step p {
  font-size: 0.875rem;
}

/* Technical diagram */
.diagram {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--text);
  overflow-x: auto;
  text-align: center;
  margin: 2rem 0;
}

.diagram .arrow {
  color: var(--blue);
  font-weight: 600;
}

/* FAQ */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  gap: 1rem;
}

.faq-question:hover {
  color: var(--blue);
}

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform 0.2s ease;
  color: var(--text-secondary);
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 0 1.25rem;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  display: block;
}

/* Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  max-width: 1000px;
  margin: 0 auto;
}

.pricing-card {
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--bg-card);
  display: flex;
  flex-direction: column;
}

.pricing-card.featured {
  border-color: var(--blue);
  box-shadow: 0 0 0 1px var(--blue), var(--shadow-lg);
  position: relative;
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--blue);
  color: white;
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.pricing-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  letter-spacing: -0.02em;
}

.pricing-price span {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.pricing-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.pricing-features {
  list-style: none;
  margin-bottom: 2rem;
  flex: 1;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.pricing-features li svg {
  width: 16px;
  height: 16px;
  color: var(--green);
  flex-shrink: 0;
  margin-top: 2px;
}

/* Footer */
.footer {
  background: var(--navy);
  color: #94a3b8;
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  font-size: 0.875rem;
  margin-top: 1rem;
  max-width: 280px;
  line-height: 1.6;
  color: #94a3b8;
}

.footer-brand .logo {
  color: white;
}

.footer h4 {
  color: white;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-links a {
  font-size: 0.875rem;
  color: #94a3b8;
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Page hero for subpages */
.page-hero {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--border);
}

.page-hero h1 {
  font-size: 2.25rem;
  margin-bottom: 0.75rem;
}

.page-hero p {
  font-size: 1.0625rem;
  max-width: 600px;
}

/* Content pages */
.content-section {
  padding: 3rem 0;
}

.prose {
  max-width: 720px;
}

.prose h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 1rem;
}

.prose h3 {
  font-size: 1.25rem;
  margin: 2rem 0 0.75rem;
}

.prose p {
  margin-bottom: 1rem;
  line-height: 1.75;
}

.prose ul, .prose ol {
  margin: 1rem 0 1.5rem 1.5rem;
  color: var(--text-secondary);
}

.prose li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--gray-100);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
}

[data-theme="dark"] .prose code {
  background: var(--navy-800);
}

.prose pre {
  background: var(--navy);
  color: #e2e8f0;
  padding: 1.25rem;
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  margin: 1.5rem 0;
}

/* Signal table / cards for supported signals */
.signal-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.signal-detail-card {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
}

.signal-detail-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.signal-detail-name {
  font-size: 1.125rem;
  font-weight: 600;
}

.signal-detail-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  font-size: 0.875rem;
}

.signal-detail-meta dt {
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.125rem;
}

.signal-detail-meta dd {
  color: var(--text-secondary);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--navy);
  color: white;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-xl);
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 100;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.375rem;
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  color: var(--text);
  background: var(--gray-50);
}

[data-theme="dark"] .theme-toggle:hover {
  background: var(--navy-800);
}

/* Final CTA */
.final-cta {
  padding: 5rem 0;
  text-align: center;
  background: linear-gradient(180deg, var(--bg-elevated) 0%, var(--bg) 100%);
}

.final-cta h2 {
  margin-bottom: 0.75rem;
}

.final-cta p {
  margin-bottom: 2rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* Accessibility */
:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.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;
}

/* Responsive */
@media (max-width: 900px) {
  .detector-layout {
    grid-template-columns: 1fr;
  }

  .detector-input-panel {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .cards-3,
  .steps,
  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .nav-links {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .nav-docs {
    display: none;
  }

  .hero {
    padding: 2.5rem 0 2rem;
  }

  .likelihood-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .trust-row {
    flex-direction: column;
    gap: 0.75rem;
  }

  .hero-ctas {
    flex-direction: column;
  }

  .hero-ctas .btn {
    width: 100%;
  }

  h1 {
    font-size: 1.875rem;
  }
}

/* Utility */
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.text-center { text-align: center; }
.flex { display: flex; }
.items-center { align-items: center; }
.gap-2 { gap: 0.5rem; }
.hidden { display: none !important; }

/* Demo banner */
.demo-banner {
  display: none;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: #92400e;
  background: #fffbeb;
  border: 1px solid #fcd34d;
  border-radius: var(--radius-sm);
}

[data-theme="dark"] .demo-banner {
  color: #fbbf24;
  background: rgba(245, 158, 11, 0.12);
  border-color: rgba(245, 158, 11, 0.3);
}