/* ============================================================
   ai-visibility-whitepaper.css
   Extracted from ai-visibility-whitepaper.html.
   All styles scoped under .whitepaper-page to avoid bleeding
   into the global layout (navbar/footer).
   Color palette and typography aligned with main site
   (brand #991B2D, dark variant #6E1320, Inter font, paper #FAF8F4).
   ============================================================ */

.whitepaper-page {
  --aipo-bg: #FAF8F4;
  --aipo-card: #ffffff;
  --aipo-text: #1A1A1A;
  --aipo-muted: #4B4F58;
  --aipo-subtle: #8A8A8A;
  --aipo-border: #E8E6E1;
  --aipo-primary: #991B2D;
  --aipo-primary-dark: #6E1320;
  --aipo-primary-soft: #FCEFEF;
  --aipo-accent: #00a88f;
  --aipo-warning: #fff7ed;
  --aipo-warning-border: #fed7aa;
  --aipo-code: #0f172a;
  --aipo-radius: 18px;
  --aipo-shadow: 0 18px 50px rgba(26, 20, 22, 0.08);

  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
    'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif;
  color: var(--aipo-text);
  background: var(--aipo-bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.whitepaper-page *,
.whitepaper-page *::before,
.whitepaper-page *::after {
  box-sizing: border-box;
}

.whitepaper-page a {
  color: var(--aipo-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.whitepaper-page a:hover {
  color: var(--aipo-primary-dark);
  text-decoration: underline;
}

/* ============ Hero (optional, kept for future use) ============ */
.whitepaper-page .whitepaper-hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 64px 24px 40px;
}

.whitepaper-page .eyebrow {
  display: inline-flex;
  align-items: center;
  margin: 0 0 18px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--aipo-primary-soft);
  color: var(--aipo-primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.whitepaper-page .whitepaper-hero h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(36px, 5.6vw, 64px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--aipo-text);
  font-weight: 800;
}

.whitepaper-page .subtitle {
  margin: 22px 0 0;
  color: var(--aipo-muted);
  font-size: clamp(18px, 2.4vw, 24px);
  font-weight: 600;
}

.whitepaper-page .hero-summary {
  max-width: 880px;
  margin: 24px 0 0;
  color: var(--aipo-muted);
  font-size: 17px;
  line-height: 1.75;
}

.whitepaper-page .hero-cta,
.whitepaper-page .chapter-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

/* ============ Buttons ============ */
.whitepaper-page .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: all 0.2s ease;
}

.whitepaper-page .btn-primary {
  color: #fff;
  background: var(--aipo-primary);
  box-shadow: 0 10px 24px rgba(153, 27, 45, 0.22);
}

.whitepaper-page .btn-primary:hover {
  color: #fff;
  background: var(--aipo-primary-dark);
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 14px 30px rgba(153, 27, 45, 0.3);
}

.whitepaper-page .btn-secondary {
  color: var(--aipo-primary);
  background: #fff;
  border: 1px solid var(--aipo-border);
}

.whitepaper-page .btn-secondary:hover {
  text-decoration: none;
  border-color: var(--aipo-primary);
  color: var(--aipo-primary-dark);
}

/* ============ Layout ============ */
.whitepaper-page .whitepaper-layout {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 24px 96px;
}

.whitepaper-page .whitepaper-content {
  max-width: none;
  margin: 0;
  padding: 0;
  min-width: 0;
}

/* ============ Chapters ============ */
.whitepaper-page .chapter {
  margin: 42px 0;
  padding: 48px;
  border: 1px solid var(--aipo-border);
  border-radius: var(--aipo-radius);
  background: var(--aipo-card);
  box-shadow: var(--aipo-shadow);
}

.whitepaper-page .chapter-label {
  margin: 0 0 12px;
  color: var(--aipo-primary);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.whitepaper-page .chapter h2 {
  margin: 0 0 20px;
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--aipo-text);
  font-weight: 800;
}

.whitepaper-page .chapter h3 {
  margin: 34px 0 14px;
  font-size: 22px;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--aipo-text);
  font-weight: 700;
}

.whitepaper-page .chapter h4 {
  margin: 26px 0 10px;
  font-size: 18px;
  line-height: 1.45;
  color: var(--aipo-text);
  font-weight: 700;
}

.whitepaper-page .chapter p {
  margin: 14px 0;
  color: var(--aipo-text);
  font-size: 16px;
  line-height: 1.75;
}

.whitepaper-page .chapter ul,
.whitepaper-page .chapter ol {
  margin: 16px 0;
  padding-left: 24px;
}

.whitepaper-page .chapter li {
  margin: 8px 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--aipo-text);
}

/* ============ Blockquote ============ */
.whitepaper-page blockquote {
  margin: 28px 0;
  padding: 22px 26px;
  border-left: 5px solid var(--aipo-primary);
  border-radius: 12px;
  background: var(--aipo-primary-soft);
  color: var(--aipo-text);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.6;
}

/* ============ Key-message callout ============ */
.whitepaper-page .key-message {
  margin: 34px 0;
  padding: 26px;
  border: 1px solid rgba(0, 168, 143, 0.22);
  border-radius: 16px;
  background: #effcf9;
}

.whitepaper-page .key-message h3 {
  margin-top: 0;
  color: #047864;
  font-size: 19px;
}

.whitepaper-page .key-message p {
  margin-bottom: 0;
}

/* ============ Tables ============ */
.whitepaper-page .comparison-table,
.whitepaper-page .image-placeholder {
  margin: 32px 0;
}

.whitepaper-page table {
  width: 100%;
  margin: 20px 0;
  border-collapse: separate;
  border-spacing: 0;
  overflow: hidden;
  border: 1px solid var(--aipo-border);
  border-radius: 14px;
  background: #fff;
}

.whitepaper-page th,
.whitepaper-page td {
  padding: 15px 16px;
  border-bottom: 1px solid var(--aipo-border);
  border-right: 1px solid var(--aipo-border);
  text-align: left;
  vertical-align: top;
  font-size: 15px;
  line-height: 1.6;
}

.whitepaper-page th:last-child,
.whitepaper-page td:last-child {
  border-right: 0;
}

.whitepaper-page tr:last-child td {
  border-bottom: 0;
}

.whitepaper-page th {
  background: #FAF8F4;
  color: var(--aipo-text);
  font-weight: 800;
}

/* ============ Image placeholder ============ */
.whitepaper-page .image-placeholder {
  padding: 24px;
  border: 1px dashed rgba(153, 27, 45, 0.35);
  border-radius: 16px;
  background: #FAF8F4;
}

.whitepaper-page .image-placeholder p {
  margin: 6px 0;
  color: var(--aipo-muted);
  font-size: 15px;
}

/* ============ Chapter CTA ============ */
.whitepaper-page .chapter-cta {
  margin: 36px 0 12px;
  padding: 24px;
  border-radius: 16px;
  background: #FAF8F4;
  border: 1px solid var(--aipo-border);
}

.whitepaper-page .chapter-cta p {
  width: 100%;
  margin: 0 0 4px;
  font-size: 17px;
  font-weight: 700;
}

/* ============ Final CTA block ============ */
.whitepaper-page .final-cta {
  margin: 36px 0 12px;
  padding: 32px;
  border-radius: 18px;
  background: linear-gradient(135deg, #FAF8F4 0%, #FCEFEF 100%);
  border: 1px solid var(--aipo-border);
}

.whitepaper-page .final-cta h3 {
  margin: 0 0 10px;
  font-size: 22px;
  color: var(--aipo-text);
  font-weight: 800;
}

.whitepaper-page .final-cta p {
  margin: 0 0 18px;
  color: var(--aipo-muted);
  font-size: 16px;
}

/* ============ Back-to-toc ============ */
.whitepaper-page .back-to-toc {
  margin-top: 34px !important;
  padding-top: 22px;
  border-top: 1px solid var(--aipo-border);
  font-size: 15px !important;
  font-weight: 700;
}

/* ============ Responsive ============ */
@media (max-width: 1080px) {
  .whitepaper-page .whitepaper-layout {
    display: block;
    max-width: 980px;
    padding: 0 20px 72px;
  }
}

@media (max-width: 820px) {
  .whitepaper-page .whitepaper-hero {
    padding: 40px 20px 24px;
  }

  .whitepaper-page .chapter {
    padding: 30px 22px;
    margin: 28px 0;
  }

  .whitepaper-page .chapter h2 {
    font-size: 26px;
  }

  .whitepaper-page .chapter h3 {
    font-size: 20px;
  }

  .whitepaper-page table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .whitepaper-page th,
  .whitepaper-page td {
    min-width: 160px;
  }
}

/* ============================================================
   Floating TOC
============================================================ */
.whitepaper-page .floating-toc-toggle {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 1000;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 52px;
  padding: 0 26px;
  border: none;
  border-radius: 999px;
  background: var(--aipo-primary);
  color: #fff;
  font-size: 15px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.01em;
  white-space: nowrap;
  cursor: pointer;
  box-shadow: 0 18px 45px rgba(153, 27, 45, 0.28);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.whitepaper-page .floating-toc-toggle:hover {
  transform: translateY(-2px);
  background: var(--aipo-primary-dark);
  box-shadow: 0 22px 55px rgba(153, 27, 45, 0.34);
}

.whitepaper-page .floating-toc-mask {
  position: fixed;
  inset: 0;
  z-index: 1001;
  background: rgba(26, 20, 22, 0.38);
  backdrop-filter: blur(4px);
}

.whitepaper-page .floating-toc-panel {
  position: fixed;
  right: 28px;
  bottom: 110px;
  z-index: 1002;
  width: min(420px, calc(100vw - 40px));
  max-height: min(680px, calc(100vh - 150px));
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--aipo-border);
  border-radius: 22px;
  background: #fff;
  box-shadow: 0 28px 80px rgba(26, 20, 22, 0.22);
}

.whitepaper-page .floating-toc-panel[hidden],
.whitepaper-page .floating-toc-mask[hidden] {
  display: none;
}

.whitepaper-page .floating-toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--aipo-border);
}

.whitepaper-page .toc-title {
  margin: 0;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--aipo-text);
}

.whitepaper-page .floating-toc-close {
  width: 34px;
  height: 34px;
  border: 1px solid var(--aipo-border);
  border-radius: 999px;
  background: #fff;
  color: var(--aipo-muted);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.whitepaper-page .floating-toc-close:hover {
  color: var(--aipo-primary);
  border-color: var(--aipo-primary);
}

.whitepaper-page .floating-toc-nav {
  padding: 12px;
  overflow-y: auto;
}

.whitepaper-page .floating-toc-nav ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.whitepaper-page .floating-toc-nav li {
  margin: 0;
}

.whitepaper-page .floating-toc-nav a {
  display: block;
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--aipo-muted);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.whitepaper-page .floating-toc-nav a:hover {
  background: var(--aipo-primary-soft);
  color: var(--aipo-primary);
  text-decoration: none;
}

.whitepaper-page .floating-toc-nav a.active {
  background: var(--aipo-primary);
  color: #fff;
}

.whitepaper-page .floating-toc-cta {
  padding: 16px 20px 20px;
  border-top: 1px solid var(--aipo-border);
}

.whitepaper-page .floating-toc-cta .btn {
  width: 100%;
}

.whitepaper-page .floating-toc-panel {
  animation: tocIn 0.18s ease-out;
}

@keyframes tocIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.98);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (max-width: 720px) {
  .whitepaper-page .floating-toc-toggle {
    right: 18px;
    bottom: 18px;
    height: 48px;
    padding: 0 22px;
    font-size: 14px;
  }

  .whitepaper-page .floating-toc-panel {
    right: 12px;
    left: 12px;
    bottom: 88px;
    width: auto;
    max-height: calc(100vh - 120px);
    border-radius: 20px;
  }
}