/* paper.css — Reading enhancement layer for research.momentum.inc
   Injected into all paper pages. Works alongside each paper's
   existing styles without overriding them. */

/* ── Reading progress bar ── */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, #8b4c3a, #c4956a);
  z-index: 99999;
  transition: width 80ms linear;
  pointer-events: none;
}

/* ── Back-to-index nav ── */
.paper-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9998;
  padding: 12px clamp(16px, 4vw, 32px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'garamond-premier-pro', 'EB Garamond', Garamond, serif;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0;
  transform: translateY(-100%);
  transition: opacity 0.3s ease, transform 0.3s ease;
  background: rgba(254, 253, 251, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(26, 25, 23, 0.06);
}

.paper-nav.visible {
  opacity: 1;
  transform: translateY(0);
}

.paper-nav a {
  color: #7a7672;
  text-decoration: none;
  transition: color 0.2s;
}

.paper-nav a:hover {
  color: #2c2c2c;
}

.paper-nav .paper-nav-title {
  color: #2c2c2c;
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
  font-size: 14px;
}

/* ── Floating TOC ── */
.floating-toc {
  position: fixed;
  bottom: clamp(24px, 5vh, 48px);
  right: clamp(16px, 3vw, 32px);
  z-index: 9997;
  background: #fefdfb;
  border: 1px solid rgba(26, 25, 23, 0.08);
  box-shadow: 0 4px 20px rgba(26, 25, 23, 0.08), 0 1px 3px rgba(26, 25, 23, 0.04);
  max-width: 280px;
  max-height: 60vh;
  overflow-y: auto;
  padding: 20px 20px 16px;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.3s ease, transform 0.3s ease;
  scrollbar-width: thin;
  scrollbar-color: rgba(26, 25, 23, 0.1) transparent;
}

.floating-toc.visible {
  opacity: 1;
  transform: translateY(0);
}

.floating-toc-label {
  font-family: 'garamond-premier-pro', 'EB Garamond', Garamond, serif;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #7a7672;
  margin-bottom: 12px;
  display: block;
}

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

.floating-toc li {
  margin-bottom: 4px;
}

.floating-toc li.toc-h3 {
  padding-left: 14px;
}

.floating-toc a {
  font-family: 'garamond-premier-pro', 'EB Garamond', Garamond, serif;
  font-size: 13px;
  line-height: 1.5;
  color: #7a7672;
  text-decoration: none;
  transition: color 0.15s;
  display: block;
  padding: 2px 0;
}

.floating-toc a:hover {
  color: #2c2c2c;
}

.floating-toc a.active {
  color: #8b4c3a;
}

/* Collapse toggle */
.floating-toc-toggle {
  position: fixed;
  bottom: clamp(24px, 5vh, 48px);
  right: clamp(16px, 3vw, 32px);
  z-index: 9996;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(26, 25, 23, 0.1);
  background: #fefdfb;
  box-shadow: 0 2px 8px rgba(26, 25, 23, 0.06);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'garamond-premier-pro', 'EB Garamond', Garamond, serif;
  font-size: 14px;
  color: #7a7672;
  transition: color 0.2s, border-color 0.2s;
  opacity: 0;
}

.floating-toc-toggle:hover {
  color: #2c2c2c;
  border-color: rgba(26, 25, 23, 0.2);
}

.floating-toc-toggle.visible {
  opacity: 1;
}

/* ── Smooth scroll ── */
html {
  scroll-behavior: smooth;
}

/* ── Mobile: hide floating TOC, show simplified nav ── */
@media (max-width: 768px) {
  .floating-toc {
    display: none;
  }
  .floating-toc-toggle {
    display: none;
  }
  .paper-nav .paper-nav-title {
    font-size: 12px;
  }
}

/* ── Print: hide overlays ── */
@media print {
  .reading-progress,
  .paper-nav,
  .floating-toc,
  .floating-toc-toggle {
    display: none !important;
  }
}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  .reading-progress {
    transition: none;
  }
  .paper-nav,
  .floating-toc {
    transition: none;
  }
  html {
    scroll-behavior: auto;
  }
}