/* =========================================================
   TRUTHDRAFT — Modern Bento SaaS Styling System
   Inspired by Keitoto's Zhuxin AI Detection SaaS
   ========================================================= */

:root {
  --bg-main: var(--color-bg, #F7F3EC);
  --card-bg: var(--color-surface, #FDFBF7);
  --card-subtle: var(--color-bg-subtle, #F5F0E6);
  --card-elevated: var(--color-bg-alt, #EFEBE1);
  --border-color: var(--color-border, rgba(28, 43, 58, 0.14));
  --border-subtle: var(--color-border-light, rgba(28, 43, 58, 0.08));
  --border-focus: var(--color-cta, #9E4B2C);
  --text-main: var(--color-ink, #1C2B3A);
  --text-muted: var(--color-text-muted, #6B6659);
  --text-dim: var(--color-text-dim, #6B6659);
  --primary-accent: var(--color-cta, #9E4B2C);
  --primary-hover: var(--color-cta-hover, #85391F);
  --primary-light: #F5EFEB;
  --primary-glow: rgba(158, 75, 44, 0.15);
  --success-bg: #eaf3ed;
  --success-text: #2f563d;
  --warning-bg: #faf2e3;
  --warning-text: #78521e;
  --danger-bg: #fae9e6;
  --danger-text: #8f281b;
  --radius-lg: 12px;
  --radius-md: 8px;
  --radius-sm: 6px;
  --radius-full: 9999px;
  --shadow-card: 0 4px 16px rgba(28, 43, 58, 0.04);
  --shadow-hover: 0 8px 24px rgba(28, 43, 58, 0.08);
  --shadow-sm: 0 1px 3px rgba(28, 43, 58, 0.06);
}

html.dark {
  --bg-main: #090d16;
  --card-bg: #111827;
  --card-subtle: #0f1523;
  --card-elevated: #1a2234;
  --border-color: #1f293d;
  --border-subtle: #192231;
  --border-focus: #3b82f6;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --primary-accent: #3b82f6;
  --primary-hover: #2563eb;
  --primary-light: rgba(59, 130, 246, 0.12);
  --primary-glow: rgba(59, 130, 246, 0.22);
  --success-bg: rgba(16, 185, 129, 0.16);
  --success-text: #34d399;
  --warning-bg: rgba(245, 158, 11, 0.18);
  --warning-text: #fbbf24;
  --danger-bg: rgba(239, 68, 68, 0.18);
  --danger-text: #f87171;
  --shadow-card: 0 12px 36px -6px rgba(0, 0, 0, 0.45);
}

/* =========================================================
   BASE & RESET
   ========================================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  tab-size: 4;
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.2s ease, color 0.2s ease;
  overflow-x: hidden;
  padding: 0 16px 24px;
}

@media (min-width: 640px) {
  body {
    padding: 0 24px 32px;
  }
}

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

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

input, select, textarea {
  font-family: inherit;
  color: inherit;
}

/* Prevent mobile browser zoom on focus (<768px MUST be 16px) */
input, select, textarea, button {
  font-size: 16px;
}

@media (min-width: 768px) {
  input, select, textarea {
    font-size: 15px;
  }
}

/* Responsive Container */
.container {
  max-width: 1040px;
  margin: 0 auto;
  width: 100%;
}

/* =========================================================
   CRISP SVG ICON SIZING
   ========================================================= */
svg {
  max-width: 100%;
  flex-shrink: 0;
  vertical-align: middle;
}

.icon-14 {
  width: 14px;
  height: 14px;
}

.icon-16 {
  width: 16px;
  height: 16px;
}

.icon-18 {
  width: 18px;
  height: 18px;
}

.icon-20 {
  width: 20px;
  height: 20px;
}

.brand-badge svg, .brand-logo svg { width: 18px; height: 18px; }
.feature-pill-icon svg { width: 18px; height: 18px; }
.ios-tab-btn svg { width: 16px; height: 16px; }
.pill-badge svg, .pill-action svg { width: 14px; height: 14px; }
.btn-primary svg, .btn-secondary svg, .btn-handoff svg, .btn-pro svg { width: 16px; height: 16px; }
.icon-btn svg { width: 18px; height: 18px; }
.faq-chevron { width: 16px; height: 16px; }

/* =========================================================
   TOP NAVIGATION
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(248, 250, 252, 0.82);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
}

html.dark .site-header {
  background: rgba(9, 13, 22, 0.82);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 12px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: #0b1220;
  color: #ffffff;
  box-shadow: none;
}

/* Apple iOS Segmented Control Tab Switcher */
.ios-segmented-control {
  display: inline-flex;
  align-items: center;
  background: var(--card-elevated);
  border: 1px solid var(--border-color);
  padding: 3px;
  border-radius: var(--radius-full);
  gap: 2px;
}

.ios-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  min-height: 36px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
}

@media (max-width: 480px) {
  .ios-tab-btn {
    padding: 6px 10px;
    font-size: 12px;
    gap: 4px;
  }
}

.ios-tab-btn:hover {
  color: var(--text-main);
}

.ios-tab-btn.active {
  background: var(--card-bg);
  color: var(--primary-accent);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
  border: 1px solid var(--border-color);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-pro {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 12px;
  min-height: 36px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary-accent);
  border: 1px solid rgba(37, 99, 235, 0.2);
  transition: all 0.15s ease;
}

.btn-pro:hover {
  background: var(--primary-accent);
  color: #ffffff;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  color: var(--text-muted);
  transition: all 0.15s ease;
}

.icon-btn:hover {
  color: var(--text-main);
  border-color: var(--border-focus);
}

/* =========================================================
   HERO HEADLINE
   ========================================================= */
.hero-section {
  text-align: center;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 6px;
  line-height: 1.2;
}

.hero-title .gradient-text {
  color: #2563eb;
}

.hero-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto;
}

@media (min-width: 640px) {
  .hero-subtitle {
    font-size: 15px;
  }
}

/* =========================================================
   THE BENTO WORKSPACE CARD
   ========================================================= */
.bento-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
  position: relative;
}

.panel-wrapper {
  display: flex;
  flex-direction: column;
}

.panel-wrapper.hidden {
  display: none !important;
}

/* =========================================================
   TOOLBARS
   ========================================================= */
.bento-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-color);
  background: var(--card-subtle);
  gap: 8px;
  flex-wrap: wrap;
}

.toolbar-left, .toolbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--card-elevated);
  border: 1px solid var(--border-color);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
}

.pill-action {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  transition: all 0.15s ease;
  min-height: 32px;
}

.pill-action:hover {
  color: var(--primary-accent);
  border-color: var(--primary-accent);
  background: var(--primary-light);
}

.pill-action.btn-danger:hover {
  color: var(--danger-text);
  border-color: var(--danger-text);
  background: var(--danger-bg);
}

/* =========================================================
   DETECTOR WORKSPACE LAYOUT
   ========================================================= */
.detector-grid {
  display: flex;
  flex-direction: column;
}

@media (min-width: 1024px) {
  .detector-grid {
    display: grid;
    grid-template-columns: 6.2fr 3.8fr;
    min-height: 480px;
  }
}

.detector-editor-col {
  display: flex;
  flex-direction: column;
  position: relative;
  border-bottom: 1px solid var(--border-color);
}

@media (min-width: 1024px) {
  .detector-editor-col {
    border-bottom: none;
    border-right: 1px solid var(--border-color);
  }
}

.canvas-editor-area {
  flex: 1;
  position: relative;
  min-height: 240px;
  display: flex;
  flex-direction: column;
}

@media (min-width: 640px) {
  .canvas-editor-area {
    min-height: 300px;
  }
}

.bento-textarea {
  flex: 1;
  width: 100%;
  height: 100%;
  border: none;
  background: transparent;
  padding: 18px;
  color: var(--text-main);
  resize: none;
  outline: none;
  line-height: 1.65;
}

.bento-textarea::placeholder {
  color: var(--text-dim);
}

/* Reading container for highlighted AI sentences */
.highlight-reading-canvas {
  flex: 1;
  width: 100%;
  height: 100%;
  padding: 18px;
  line-height: 1.7;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.highlight-reading-canvas.hidden {
  display: none !important;
}

.ai-highlight {
  background-color: var(--warning-bg);
  color: var(--warning-text);
  padding: 2px 4px;
  border-radius: 4px;
  border-bottom: 1.5px solid rgba(245, 158, 11, 0.6);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.ai-highlight:hover {
  background-color: #fde68a;
}

/* Bottom Actions Bar */
.editor-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-top: 1px solid var(--border-color);
  background: var(--card-subtle);
  gap: 12px;
}

.word-count-chip {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* Primary SaaS Action Button (Solid Royal Blue) */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--primary-accent);
  color: #ffffff;
  font-size: 14px;
  font-weight: 600;
  padding: 10px 20px;
  min-height: 44px;
  border-radius: var(--radius-md);
  box-shadow: 0 2px 8px var(--primary-glow);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* =========================================================
   DETECTOR RESULTS SIDEBAR / DRAWER
   ========================================================= */
.detector-results-col {
  background: var(--card-subtle);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.score-hero-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow-sm);
}

.score-display-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.score-metric {
  font-size: clamp(32px, 5vw, 42px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
}

.score-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  background: var(--card-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary-accent);
}

.breakdown-row {
  display: flex;
  gap: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--border-color);
}

.breakdown-pill {
  flex: 1;
  background: var(--card-subtle);
  border: 1px solid var(--border-color);
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  text-align: center;
}

.breakdown-label {
  display: block;
  font-size: 10px;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.breakdown-value {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
  font-family: ui-monospace, SFMono-Regular, monospace;
}

/* Flagged sentences section */
.flagged-section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.flagged-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 180px;
  overflow-y: auto;
}

.flagged-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 12px;
  color: var(--text-main);
  line-height: 1.5;
  transition: all 0.15s ease;
  cursor: pointer;
}

.flagged-card:hover {
  border-color: #f59e0b;
  background: var(--warning-bg);
}

/* Prominent Conversion Handoff Card */
.handoff-action-card {
  background: #f8fafc;
  border: 1px solid rgba(37, 99, 235, 0.25);
  border-radius: var(--radius-md);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: center;
}

.handoff-card-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
}

.btn-handoff {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: #2563eb;
  color: #ffffff;
  font-size: 13px;
  font-weight: 600;
  padding: 9px 14px;
  min-height: 40px;
  border-radius: var(--radius-sm);
  box-shadow: 0 2px 8px var(--primary-glow);
  transition: all 0.15s ease;
}

.btn-handoff:hover {
  background: #1d4ed8;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--card-bg);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  font-size: 12px;
  font-weight: 600;
  padding: 8px 14px;
  min-height: 38px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.btn-secondary:hover {
  color: var(--text-main);
  border-color: var(--border-focus);
}

/* =========================================================
   HUMANIZER WORKSPACE LAYOUT
   ========================================================= */
/* Mobile pane switcher: [ Input Draft ] [ Result ] */
.mobile-pane-switcher {
  display: flex;
  background: var(--card-elevated);
  border: 1px solid var(--border-color);
  padding: 3px;
  border-radius: var(--radius-sm);
  margin: 12px 16px 0;
  gap: 2px;
}

@media (min-width: 768px) {
  .mobile-pane-switcher {
    display: none !important;
  }
}

.mobile-pane-btn {
  flex: 1;
  padding: 8px;
  min-height: 36px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: 6px;
  transition: all 0.15s ease;
  text-align: center;
}

.mobile-pane-btn.active {
  background: var(--card-bg);
  color: var(--primary-accent);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

/* Dual Pane Grid */
.humanizer-grid {
  display: flex;
  flex-direction: column;
}

@media (max-width: 767px) {
  .humanizer-grid.show-input .humanizer-col-right {
    display: none !important;
  }
  .humanizer-grid.show-result .humanizer-col-left {
    display: none !important;
  }
}

@media (min-width: 768px) {
  .humanizer-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 480px;
  }
}

.humanizer-col-left {
  display: flex;
  flex-direction: column;
  position: relative;
  border-bottom: 1px solid var(--border-color);
}

@media (min-width: 768px) {
  .humanizer-col-left {
    border-bottom: none;
    border-right: 1px solid var(--border-color);
  }
}

.humanizer-col-right {
  display: flex;
  flex-direction: column;
  background: var(--card-subtle);
  position: relative;
}

/* Mode Switchers */
.mode-pills-group {
  display: inline-flex;
  align-items: center;
  background: var(--card-elevated);
  border: 1px solid var(--border-color);
  padding: 2px;
  border-radius: var(--radius-full);
  gap: 2px;
}

.mode-tab {
  padding: 4px 10px;
  min-height: 28px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  transition: all 0.15s ease;
}

.mode-tab:hover {
  color: var(--text-main);
}

.mode-tab.active {
  background: var(--card-bg);
  color: var(--text-main);
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.clean-select {
  padding: 4px 10px;
  min-height: 32px;
  border-radius: var(--radius-sm);
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  outline: none;
  cursor: pointer;
}

.clean-select:focus {
  border-color: var(--border-focus);
}

.output-reading-canvas {
  flex: 1;
  padding: 18px;
  line-height: 1.7;
  overflow-y: auto;
  font-size: 15px;
  color: var(--text-main);
  min-height: 240px;
}

@media (min-width: 640px) {
  .output-reading-canvas {
    min-height: 300px;
  }
}

.empty-state-notice {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 32px 16px;
  color: var(--text-dim);
  gap: 8px;
}

.score-badge-success {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: var(--success-bg);
  color: var(--success-text);
  font-size: 11px;
  font-weight: 600;
}

/* =========================================================
   BELOW WORKSPACE: 3 FEATURE PILLS
   ========================================================= */
.feature-pills-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 32px 0;
}

@media (min-width: 640px) {
  .feature-pills-row {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-pill-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.feature-pill-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-focus);
}

.humanizer-info-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 28px 0 12px;
}

.humanizer-info-card {
  padding: 20px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--card-bg);
}

.humanizer-info-card h2,
.humanizer-workflow-band h2 {
  margin: 7px 0 8px;
  color: var(--text-main);
  font-size: 16px;
  line-height: 1.3;
}

.humanizer-info-card p,
.humanizer-workflow-band p {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.65;
}

.humanizer-info-card a,
.workflow-links a {
  color: var(--primary-accent);
  font-weight: 600;
}

.info-kicker {
  color: var(--primary-accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.humanizer-workflow-band {
  display: grid;
  grid-template-columns: 1.1fr 1.4fr auto;
  align-items: center;
  gap: 24px;
  padding: 22px 24px;
  margin-top: 12px;
  border: 1px solid rgba(37, 99, 235, 0.22);
  border-radius: var(--radius-md);
  background: var(--card-bg);
}

.humanizer-workflow-band h2 {
  margin-bottom: 0;
  font-size: 20px;
}

.workflow-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  white-space: nowrap;
  font-size: 12px;
}

@media (max-width: 767px) {
  .humanizer-info-grid,
  .humanizer-workflow-band {
    grid-template-columns: 1fr;
  }

  .humanizer-workflow-band {
    gap: 14px;
    padding: 20px;
  }
}

.feature-pill-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  color: var(--primary-accent);
  flex-shrink: 0;
}

.feature-pill-text {
  display: flex;
  flex-direction: column;
}

.feature-pill-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
}

.feature-pill-desc {
  font-size: 12px;
  color: var(--text-muted);
}

/* =========================================================
   COMPACT FAQ ACCORDION
   ========================================================= */
.faq-section {
  margin: 36px 0;
}

.faq-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
  text-align: center;
}

.faq-grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 760px;
  margin: 0 auto;
}

.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.15s ease;
}

.faq-item summary {
  padding: 14px 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  user-select: none;
}

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

.faq-chevron {
  color: var(--text-dim);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
}

.faq-body {
  padding: 0 18px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-muted);
}

/* =========================================================
   MINIMALIST SINGLE-LINE FOOTER
   ========================================================= */
.site-footer {
  margin-top: auto;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    text-align: left;
  }
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-links a:hover {
  color: var(--primary-accent);
}

.session-stat-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  background: var(--card-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-family: ui-monospace, SFMono-Regular, monospace;
}

/* =========================================================
   MODALS (PRO WAITLIST & CONTACT)
   ========================================================= */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 1;
  transition: opacity 0.2s ease;
}

.modal-overlay.hidden {
  display: none !important;
}

.modal-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-hover);
  width: 100%;
  max-width: 440px;
  padding: 24px;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
}

.modal-close-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  transition: all 0.15s ease;
}

.modal-close-btn:hover {
  color: var(--text-main);
  background: var(--card-elevated);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}

.form-input {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--card-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  outline: none;
}

.form-input:focus {
  border-color: var(--border-focus);
}

/* =========================================================
   LOADING SPINNER & OVERLAY
   ========================================================= */
.spinner-ring {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-ring-lg {
  display: inline-block;
  width: 32px;
  height: 32px;
  border: 3px solid var(--primary-accent);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.detector-loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  z-index: 20;
}

html.dark .detector-loading-overlay {
  background: rgba(17, 24, 39, 0.88);
}

.detector-loading-overlay.hidden {
  display: none !important;
}

/* Helper Utilities */
.hidden {
  display: none !important;
}

.text-success {
  color: var(--success-text) !important;
}

.text-warning {
  color: var(--warning-text) !important;
}

.text-danger {
  color: var(--danger-text) !important;
}

/* Homepage product walkthrough */
body:has(.demo-showcase) { display: block; padding: 0; }
.hero { min-height: 565px; grid-template-columns: .82fr 1.18fr; gap: 54px; padding: 76px 24px 66px; }
.hero-copy { max-width: 475px; }
.demo-showcase { width: 100%; max-width: 620px; min-width: 0; margin: 0 auto; }
.demo-window { display: flex; min-height: 0; aspect-ratio: 3 / 2; flex-direction: column; overflow: hidden; border: 1px solid #e2e8f0; border-radius: 14px; background: #fff; color: #0f172a; box-shadow: 0 24px 48px -12px rgba(15,23,42,.08); font: 14px/1.7 Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif; }
.demo-header { display: grid; min-height: 50px; grid-template-columns: 1fr auto 1fr; align-items: center; padding: 0 16px; border-bottom: 1px solid #e2e8f0; background: #fff; }
.demo-window-controls { display: flex; align-items: center; gap: 7px; } .control-dot { width: 10px; height: 10px; border-radius: 50%; }
.control-dot.close { background: #ef4444; } .control-dot.minimize { background: #f59e0b; } .control-dot.expand { background: #10b981; }
.demo-title-tab { display: flex; align-items: center; gap: 8px; color: #475569; font-size: 12px; font-weight: 600; white-space: nowrap; } .demo-title-tab svg { color: #2563eb; }
.demo-replay-btn { display: inline-flex; min-height: 30px; align-items: center; justify-self: end; gap: 6px; padding: 0 9px; border: 1px solid #e2e8f0; border-radius: 6px; background: #fff; color: #475569; font-size: 11px; transition: background .2s,border-color .2s; }
.demo-replay-btn:hover { border-color: #94a3b8; background: #f8fafc; }
.demo-canvas { display: grid; min-height: 0; flex: 1; grid-template-columns: minmax(0,1fr) 245px; }
.demo-editor { display: flex; min-width: 0; flex-direction: column; padding: 20px 22px 18px; }
.demo-editor-meta { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.demo-badge-subtle,.demo-word-counter { color: #64748b; font-size: 11px; } .demo-badge-subtle { font-weight: 600; } .demo-word-counter { font-variant-numeric: tabular-nums; white-space: nowrap; }
.demo-text-surface { position: relative; min-height: 0; flex: 1; overflow: hidden; padding: 4px 2px; color: #334155; }
.demo-paragraph { margin: 0; font-size: 12px; line-height: 1.55; transition: opacity .24s ease,filter .24s ease; }
.demo-typing-cursor { display: inline-block; width: 1px; height: 1.12em; margin-left: 2px; vertical-align: -2px; background: #2563eb; animation: demo-caret .9s steps(2,end) infinite; } .demo-typing-cursor.is-hidden { display: none; }
@keyframes demo-caret { 50% { opacity: 0; } }
.ai-detected-phrase { padding: 1px 3px; border-bottom: 2px solid #f59e0b; border-radius: 3px; background: rgba(245,158,11,.2); color: #92400e; transition: background .35s,color .35s; }
.demo-scan-laser { position: absolute; top: 0; right: 0; left: 0; height: 2px; pointer-events: none; opacity: 0; background: linear-gradient(90deg,transparent,#2563eb,transparent); box-shadow: 0 0 12px #3b82f6; }
.demo-scan-laser.scanning { opacity: 1; animation: demo-laser 1.2s ease-in-out forwards; } .demo-scan-laser.verifying { opacity: 1; background: linear-gradient(90deg,transparent,#10b981,transparent); box-shadow: 0 0 10px rgba(16,185,129,.55); animation: demo-laser .75s ease-in-out forwards; }
@keyframes demo-laser { from { top: 0; } to { top: calc(100% - 2px); } }
.demo-editor-footer { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 12px; padding-top: 12px; border-top: 1px solid #e2e8f0; }
.demo-status-text { min-width: 0; color: #64748b; font-size: 11px; line-height: 1.4; }
.demo-btn { display: inline-flex; min-height: 36px; flex: 0 0 auto; align-items: center; justify-content: center; gap: 7px; padding: 0 12px; border: 1px solid #1d4ed8; border-radius: 6px; background: #2563eb; color: #fff; font-size: 11px; font-weight: 600; transition: transform .2s,filter .2s,box-shadow .2s,background .2s; }
.demo-btn.btn-simulated-click { transform: scale(.96); filter: brightness(.9); box-shadow: 0 0 0 3px rgba(37,99,235,.24); }
.demo-sidebar { display: flex; min-width: 0; flex-direction: column; gap: 13px; padding: 18px; border-left: 1px solid #e2e8f0; background: #f8fafc; }
.demo-metric-card { padding: 14px; border: 1px solid #e2e8f0; border-radius: 8px; background: #fff; }
.demo-metric-label { display: flex; align-items: center; justify-content: space-between; color: #64748b; font-size: 10px; font-weight: 600; letter-spacing: .035em; text-transform: uppercase; }
.demo-info-mark { display: grid; width: 16px; height: 16px; place-items: center; border: 1px solid #cbd5e1; border-radius: 50%; font-size: 10px; text-transform: none; }
.demo-score-display { margin: 4px 0 0; color: #64748b; font-size: 36px; font-weight: 650; letter-spacing: -.06em; line-height: 1.2; font-variant-numeric: tabular-nums; transition: color .25s; } .demo-score-display.is-ai { color: #b45309; } .demo-score-display.is-human { color: #047857; }
.demo-score-display.is-summary { font-size: 23px; letter-spacing: -.04em; } .demo-score-display.is-summary span { display: block; font-size: .82em; white-space: nowrap; }
.demo-score-status { color: #64748b; font-size: 11px; line-height: 1.45; } .demo-score-status.is-ai { color: #92400e; } .demo-score-status.is-human { color: #047857; }
.demo-action-module { margin-top: auto; } .demo-action-hint { margin: 0 0 8px; color: #64748b; font-size: 10px; line-height: 1.5; }
.demo-btn-humanize { width: 100%; border-color: #cbd5e1; background: #fff; color: #334155; } .demo-btn-humanize:disabled { cursor: not-allowed; opacity: .48; } .demo-btn-humanize.is-ready { border-color: #2563eb; background: #2563eb; color: #fff; box-shadow: 0 0 0 3px rgba(37,99,235,.1); }
.demo-legend { display: grid; gap: 7px; padding-top: 12px; border-top: 1px solid #e2e8f0; } .legend-row { display: grid; grid-template-columns: 8px 1fr auto; align-items: center; gap: 8px; color: #64748b; font-size: 10px; }
.legend-dot { width: 7px; height: 7px; border-radius: 50%; } .legend-dot.ai { background: #f59e0b; } .legend-dot.human { background: #10b981; } .legend-val { color: #334155; font-weight: 600; font-variant-numeric: tabular-nums; }
.demo-disclaimer { margin: 0; color: #64748b; font-size: 9px; line-height: 1.45; }
.demo-paragraph.text-morph-out { opacity: 0; filter: blur(4px); } .demo-paragraph.text-morph-in { opacity: 1; filter: blur(0); }
html.dark .demo-window { border-color: #1f2937; background: #111827; color: #e5e7eb; } html.dark .demo-header { border-color: #1f2937; background: #111827; } html.dark .demo-title-tab,html.dark .demo-text-surface { color: #d1d5db; }
html.dark .demo-sidebar { border-color: #1f2937; background: #0f1523; } html.dark .demo-metric-card,html.dark .demo-btn-humanize,html.dark .demo-replay-btn { border-color: #374151; background: #111827; color: #e5e7eb; }
html.dark .demo-editor-footer,html.dark .demo-legend { border-color: #1f2937; } html.dark .demo-score-display,html.dark .legend-val { color: #e5e7eb; } html.dark .demo-score-display.is-ai,html.dark .demo-score-status.is-ai,html.dark .ai-detected-phrase { color: #fbbf24; } html.dark .demo-score-display.is-human,html.dark .demo-score-status.is-human { color: #34d399; }
@media (max-width: 1100px) and (min-width: 860px) { .hero { min-height: 0; grid-template-columns: 1fr; gap: 36px; padding-top: 64px; padding-bottom: 64px; } .hero-copy { max-width: 680px; } .demo-showcase { max-width: 620px; } }
@media (max-width: 859px) { .demo-window { min-height: 520px; aspect-ratio: auto; } .demo-canvas { grid-template-columns: minmax(0,1fr) 220px; } .demo-sidebar { padding: 16px; } .demo-editor { padding: 18px 16px; } }
@media (max-width: 859px) { .demo-showcase { width: 100%; padding: 0 16px; } .demo-window { min-height: 520px; } .demo-header { min-height: 48px; padding: 0 12px; } .demo-canvas { grid-template-columns: 1fr; grid-template-rows: minmax(340px,auto) auto; } .demo-editor { min-height: 340px; padding: 16px; } .demo-sidebar { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 10px; padding: 12px 16px; border-top: 1px solid #e2e8f0; border-left: 0; } .demo-metric-card { grid-row: span 2; padding: 10px; } .demo-score-display { font-size: 30px; } .demo-action-module { margin-top: 0; } .demo-action-hint { margin-bottom: 5px; font-size: 9px; } .demo-btn-humanize { min-height: 34px; padding: 0 8px; } .demo-legend { grid-column: 2; padding-top: 7px; } .demo-disclaimer { grid-column: 1 / -1; } .demo-title-tab { font-size: 10px; } }
@media (max-width: 380px) { .demo-sidebar { grid-template-columns: minmax(0,.85fr) minmax(0,1.15fr); gap: 8px; padding-right: 12px; padding-left: 12px; } }
@media (prefers-reduced-motion: reduce) { .demo-typing-cursor { animation: none; } .demo-scan-laser.scanning,.demo-scan-laser.verifying { animation-duration: .01ms; } .demo-paragraph,.demo-btn { transition-duration: .01ms; } }
@media (min-width: 1101px) {
  .hero { min-height: 565px; grid-template-columns: .82fr 1.18fr; gap: 54px; padding: 76px 24px 66px; }
  .hero-copy { max-width: 475px; }
  .demo-showcase { max-width: 620px; }
  .demo-window { min-height: 0; aspect-ratio: 3 / 2; }
  .demo-canvas { grid-template-columns: minmax(0,1fr) 190px; }
  .demo-editor { padding: 16px; }
  .demo-sidebar { padding: 14px; }
}
@media (min-width: 1101px) and (max-width: 1250px) { .demo-canvas { grid-template-columns: minmax(0,1fr) 172px; } }

/* Keep homepage hero typography aligned with the hosted landing page rules.
   These scoped selectors also prevent the generic tool-page heading sizes from winning. */
.hero-copy .eyebrow { font-size: 11px; }
.hero-copy .hero-title { max-width: 480px; font-size: clamp(43px,5.2vw,64px); }
.hero-copy .hero-subtitle { max-width: 440px; margin: 0 0 26px; font-size: 17px; line-height: 1.65; }
.hero-copy .btn-hero-primary { padding: 13px 18px; font-size: 14px; }
.hero-copy .hero-note { max-width: 390px; font-size: 12px; line-height: 1.6; }
/* Center the capped FAQ column despite the generic tool-page section margin. */
.faq-section { width: min(100%, 790px); margin-inline: auto; }
@media (max-width: 900px) {
  .hero { min-height: 0; grid-template-columns: 1fr; gap: 40px; padding-top: 64px; }
  .hero-copy { max-width: 680px; }
  .hero-copy .hero-title { max-width: 620px; }
  .demo-showcase { width: 100%; }
}
@media (max-width: 640px) {
  .hero { gap: 29px; padding: 48px 16px 42px; }
  .hero-copy .hero-title { font-size: clamp(42px,12vw,56px); }
  .hero-copy .hero-subtitle { font-size: 15px; }
}