/* chshlab/css/paper.css */

.paper-banner {
  background: rgba(22, 25, 33, 0.80);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.08);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.15);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-mono);
  font-size: 11px;
  color: #94a3b8;
  text-align: center;
}

.paper-banner a {
  color: #60a5fa;
}

.paper-layout {
  --paper-link: #60a5fa;
  --paper-link-hover: #93c5fd;
  --surface: #161921;
  --surface-2: #1c2029;
  --surface-paper: rgba(96, 165, 250, 0.04);
  --paper-stain-soft: rgba(96, 165, 250, 0.06);
  --paper-shadow-soft: 0 18px 44px rgba(0, 0, 0, 0.25);
  --paper-shadow: 0 24px 60px rgba(0, 0, 0, 0.30);
  --ink-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  --border: rgba(148, 163, 184, 0.16);
  --border-light: rgba(148, 163, 184, 0.08);
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-subtle: #7c8da3;
  --text-faint: #7089a0;
  --amber: #c9a94d;
  --amber-dim: #4a3f20;
  --blue: #60a5fa;
  --blue-dim: #1e3a5f;
  --crimson: #f87171;
  --crimson-dim: #4a1e1e;
  --rule: rgba(96, 165, 250, 0.18);
  display: grid;
  grid-template-columns: 1fr;
  max-width: 1160px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
  color: var(--text);
}

.paper-layout > * {
  min-width: 0;
}

@media (min-width: 1100px) {
  .paper-layout {
    grid-template-columns: 190px minmax(0, 780px);
    gap: var(--space-5);
  }
}

.paper-toc {
  position: sticky;
  top: var(--space-6);
  align-self: start;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.8;
  min-width: 0;
}

.paper-toc a {
  display: block;
  padding: 3px 0 3px 12px;
  border-left: 1px solid var(--border);
  color: var(--text-subtle);
  text-decoration: none;
  transition: padding-left 0.2s ease, color 0.15s ease, border-color 0.2s ease;
}

.paper-toc a:hover {
  padding-left: 16px;
}

.paper-toc a:hover,
.paper-toc a.toc-active {
  color: var(--paper-link);
  border-left-color: var(--paper-link);
}

.paper-toc a.toc-active {
  text-shadow: 0 0 8px rgba(96, 165, 250, 0.25);
}

.paper-toc-mobile {
  display: none;
  margin-bottom: var(--space-4);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--paper-shadow-soft);
}

.paper-toc-mobile summary {
  cursor: pointer;
  list-style: none;
  padding: var(--space-3);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-subtle);
}

.paper-toc-mobile summary::-webkit-details-marker {
  display: none;
}

.paper-toc-mobile nav {
  display: grid;
  gap: var(--space-2);
  padding: 0 var(--space-3) var(--space-3);
}

.paper-toc-mobile a {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--paper-link);
  text-decoration: none;
}

@media (max-width: 1099px) {
  .paper-toc {
    display: none;
  }

  .paper-toc-mobile {
    display: block;
  }
}

.paper-article {
  position: relative;
  width: min(100%, 780px);
  max-width: 780px;
  min-width: 0;
  line-height: 1.8;
  counter-reset: section;
  background: rgba(22, 25, 33, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(148, 163, 184, 0.08);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.30), inset 0 1px 0 rgba(255, 255, 255, 0.03);
  padding: 48px 56px 56px;
}

.paper-article::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(96, 165, 250, 0.30), transparent);
}

.paper-header {
  margin-bottom: var(--space-6);
  min-width: 0;
}

.paper-kicker,
.paper-section-label {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--paper-link);
  display: inline-block;
  padding-inline: 2px 8px;
  box-shadow: inset 0 -0.58em 0 rgba(96, 165, 250, 0.12);
}

.paper-kicker {
  margin-bottom: var(--space-2);
}

.paper-article h1 {
  font-family: 'Cormorant Garamond', 'Georgia', serif;
  font-size: clamp(2.15rem, 4vw, 3.4rem);
  line-height: 1.08;
  margin-bottom: var(--space-3);
  max-width: 20ch;
  color: var(--text);
  text-shadow: none;
}

.paper-byline {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
  overflow-wrap: anywhere;
}

.paper-byline a,
.paper-article a:not(.paper-action) {
  color: var(--paper-link);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.15s ease;
}

.paper-article a:not(.paper-action):hover {
  color: var(--paper-link-hover);
}

.paper-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  padding-block: var(--space-3);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  background: rgba(96, 165, 250, 0.03);
}

.paper-meta dt {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.paper-meta dd {
  margin-top: 2px;
  color: var(--text-muted);
}

.paper-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  min-width: 0;
}

.paper-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  min-width: 0;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.paper-action:hover {
  color: var(--text);
  border-color: rgba(96, 165, 250, 0.28);
  text-decoration: none;
}

.paper-action--button {
  appearance: none;
}

.paper-thesis {
  margin-bottom: var(--space-4);
  font-size: 1.12rem;
  line-height: 1.6;
  color: var(--text);
  max-width: 50ch;
}

.paper-findings {
  display: grid;
  gap: var(--space-2);
  margin: 0 0 var(--space-5);
  padding-left: 1.1rem;
  color: var(--text-muted);
}

.paper-findings li {
  line-height: 1.65;
}

.paper-section {
  position: relative;
  margin-bottom: var(--space-6);
  scroll-margin-top: 76px;
}

.paper-section + .paper-section::before {
  content: '';
  display: block;
  margin: var(--space-5) auto var(--space-6);
  width: 60px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--paper-link), transparent);
  opacity: 0.3;
}

.paper-section--abstract {
  margin-bottom: 0;
}

.paper-article h2 {
  font-family: 'Cormorant Garamond', 'Georgia', serif;
  font-size: clamp(1.45rem, 2vw, 2.0rem);
  letter-spacing: 0.01em;
  margin-top: var(--space-7);
  margin-bottom: var(--space-3);
  counter-increment: section;
  padding-bottom: 0.4em;
  border-bottom: 1px solid rgba(148, 163, 184, 0.08);
}

.paper-article h2::before {
  content: counter(section) ". ";
  color: var(--paper-link);
  font-weight: 300;
}

.paper-section--abstract h2::before {
  content: "";
}

.paper-article h3 {
  font-family: 'Cormorant Garamond', 'Georgia', serif;
  font-size: 1.18rem;
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
  color: var(--text);
}

.paper-article p {
  margin-bottom: var(--space-3);
}

.paper-abstract {
  margin-top: var(--space-3);
  border-left: 3px solid var(--paper-link);
  background: radial-gradient(ellipse at top left, rgba(96, 165, 250, 0.08) 0%, rgba(96, 165, 250, 0.03) 50%, transparent 100%);
  padding: var(--space-4);
  color: var(--text-muted);
  box-shadow: var(--paper-shadow-soft);
}

.paper-formal {
  position: relative;
  margin-block: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  overflow: hidden;
  background: linear-gradient(135deg, var(--surface) 0%, rgba(96, 165, 250, 0.03) 100%);
  box-shadow: var(--paper-shadow-soft);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

@media (prefers-reduced-motion: no-preference) {
  .paper-formal:hover {
    transform: perspective(800px) rotateY(1deg);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  }
}

.paper-formal::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, rgba(96, 165, 250, 0.40), transparent 55%);
}

.paper-formal::after {
  content: '';
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(148, 163, 184, 0.04);
  pointer-events: none;
}

.paper-formal--definition {
  border-left: 3px solid var(--paper-link);
}

.paper-formal--proposition {
  border-left: 3px solid var(--crimson);
}

.paper-formal__header {
  margin-bottom: var(--space-2);
}

.paper-formal__eyebrow {
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--paper-link);
  display: inline-block;
  padding-inline: 2px 8px;
  box-shadow: inset 0 -0.58em 0 rgba(96, 165, 250, 0.12);
}

.paper-formal__title {
  margin: 0;
  font-size: 1.02rem;
}

.paper-formal__statement {
  margin-bottom: var(--space-2);
  color: var(--text-muted);
}

.paper-notation-grid {
  display: grid;
  gap: var(--space-2);
  margin-block: var(--space-4);
}

.paper-notation-grid div {
  padding: var(--space-3);
  border: 1px solid var(--border-light);
  background: rgba(96, 165, 250, 0.03);
  box-shadow: var(--paper-shadow-soft);
}

.paper-notation-grid__term {
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.paper-notation-grid__desc {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.65;
}

.paper-proof {
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border-top: 1px solid var(--border-light);
}

.paper-proof summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-subtle);
  display: inline-block;
  padding-inline: 2px 8px;
  box-shadow: inset 0 -0.58em 0 rgba(96, 165, 250, 0.10);
}

.paper-proof summary::-webkit-details-marker {
  display: none;
}

.paper-proof[open] summary {
  color: var(--paper-link);
}

.paper-proof__body {
  margin-top: var(--space-2);
  color: var(--text-muted);
  padding-left: var(--space-3);
  position: relative;
}

.paper-proof__body::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--paper-link), rgba(96, 165, 250, 0.22));
}

.paper-proof__body p:last-child {
  margin-bottom: 0;
}

.paper-algorithm {
  margin: 0 0 var(--space-3);
  padding: var(--space-3) var(--space-4) var(--space-3) calc(var(--space-4) + 1rem);
  border: 1px solid var(--border);
  background: rgba(96, 165, 250, 0.03);
  box-shadow: var(--paper-shadow-soft);
}

.paper-algorithm li {
  margin-bottom: var(--space-2);
  color: var(--text-muted);
}

.paper-algorithm li:last-child {
  margin-bottom: 0;
}

.paper-citation {
  font-family: var(--font-mono);
  font-size: 0.78em;
  vertical-align: super;
  color: var(--paper-link);
  text-decoration: none;
}

.paper-citation:hover {
  color: var(--paper-link-hover);
  text-decoration: underline;
}

.paper-article .math-block {
  background: linear-gradient(135deg, var(--surface-2) 0%, rgba(96, 165, 250, 0.04) 100%);
  border: 1px solid var(--border);
  border-left: 3px solid var(--paper-link);
  padding: var(--space-3) var(--space-4);
  margin-block: var(--space-4);
  overflow-x: auto;
  box-shadow: var(--paper-shadow-soft);
}

.paper-article .math-block .katex-display {
  margin: 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.paper-figure {
  position: relative;
  margin-block: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: var(--space-3);
  box-shadow: var(--paper-shadow-soft);
}

.paper-figure::before {
  content: '';
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(148, 163, 184, 0.05);
  pointer-events: none;
}

.paper-figure img {
  display: block;
  width: 100%;
  height: auto;
  background: transparent;
  animation: fadeIn 0.6s ease both;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.paper-figure figcaption {
  margin-top: var(--space-3);
  font-size: 0.84rem;
  color: var(--text-faint);
  line-height: 1.6;
  letter-spacing: 0.005em;
}

.paper-table-wrap {
  margin-block: var(--space-4);
  overflow-x: auto;
}

.paper-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.paper-table caption {
  margin-bottom: var(--space-2);
  text-align: left;
  font-size: 0.84rem;
  color: var(--text-subtle);
  font-style: italic;
}

.paper-table th {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-subtle);
}

.paper-table td {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--border-light);
  color: var(--text-muted);
  vertical-align: top;
  transition: background 0.15s ease;
}

.paper-table tbody tr:nth-child(odd) td {
  background: rgba(96, 165, 250, 0.03);
}

.paper-table tbody tr:hover td {
  background: rgba(96, 165, 250, 0.07);
}

.sidenote {
  font-size: 0.78rem;
  color: var(--text-subtle);
  line-height: 1.55;
}

.sidenote::before {
  content: '\2726';
  display: block;
  font-size: 10px;
  color: var(--paper-link);
  margin-bottom: 6px;
  font-style: normal;
}

@media (min-width: 1100px) {
  .sidenote {
    position: absolute;
    right: -230px;
    top: var(--space-5);
    width: 200px;
    padding: 12px 14px;
    background: rgba(96, 165, 250, 0.04);
    border: 1px solid rgba(148, 163, 184, 0.10);
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    font-style: italic;
  }
}

@media (max-width: 1099px) {
  .sidenote {
    display: block;
    margin: var(--space-3) 0;
    padding: var(--space-3);
    background: rgba(96, 165, 250, 0.04);
    border: 1px solid rgba(148, 163, 184, 0.10);
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    font-style: italic;
  }
}

.paper-footer {
  margin-top: var(--space-7);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-subtle);
}

.paper-footer a {
  color: var(--paper-link);
}

.paper-toc a:focus-visible,
.paper-toc-mobile a:focus-visible,
.paper-toc-mobile summary:focus-visible,
.paper-action:focus-visible {
  outline: 2px solid var(--paper-link);
  outline-offset: 3px;
}

@media (max-width: 820px) {
  .paper-layout {
    padding: var(--space-5) var(--space-3);
  }

  .paper-article {
    padding: 32px 24px 36px;
  }

  .paper-article h1 {
    max-width: none;
  }

  .paper-actions {
    flex-direction: column;
  }

  .paper-action {
    width: 100%;
  }

  .paper-meta {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 700px) {
  .paper-notation-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ── READING PROGRESS BAR ── */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--paper-link), var(--crimson));
  z-index: 1000;
  transition: width 50ms linear;
}

/* ── HIGHLIGHT MARKS ── */
.highlight-mark {
  background-image: linear-gradient(120deg, rgba(248, 113, 113, 0) 0%, rgba(248, 113, 113, 0.18) 50%, rgba(248, 113, 113, 0) 100%);
  background-repeat: no-repeat;
  background-size: 0% 100%;
  background-position: 0 0;
  transition: background-size 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  padding: 2px 0;
}

.highlight-mark.visible {
  background-size: 100% 100%;
}

/* ── SCROLL REVEAL (paper page) ── */
.paper-section {
  opacity: 1;
}

@media (prefers-reduced-motion: no-preference) {
  .paper-section.gsap-reveal {
    opacity: 0;
    transform: translateY(20px);
  }

  .paper-figure.gsap-reveal {
    opacity: 0;
    transform: scale(0.98);
  }

  .paper-formal.gsap-reveal {
    opacity: 0;
    transform: translateY(12px);
  }
}

/* ── SMOOTH SECTION TRANSITIONS (scroll-out fade) ── */
@media (prefers-reduced-motion: no-preference) {
  .paper-section {
    transition: opacity 0.5s ease;
  }
  .paper-section.section-faded {
    opacity: 0.55;
  }
}

/* ── SIDENOTE ENTRANCE ANIMATION (desktop) ── */
@media (min-width: 1100px) and (prefers-reduced-motion: no-preference) {
  .sidenote {
    opacity: 0;
    transform: translateX(20px);
    transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  }
  .sidenote.sidenote-visible {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ── KATEX MATH GLOW ── */
@media (prefers-reduced-motion: no-preference) {
  .paper-article .math-block .katex-display {
    text-shadow: 0 0 6px rgba(96, 165, 250, 0.08);
  }
}

@media print {
  .reading-progress,
  .ambient-toggle {
    display: none !important;
  }

  body::before,
  body::after,
  .paper-banner,
  .paper-actions,
  .paper-toc,
  .paper-toc-mobile,
  .skip-link {
    display: none !important;
  }

  body {
    background: white !important;
    color: black !important;
  }

  .paper-layout {
    display: block;
    max-width: 100%;
    padding: 0;
  }

  .paper-article {
    width: 100%;
    max-width: 100%;
    background: white;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: none;
    box-shadow: none;
    padding: 0;
  }

  .paper-section,
  .paper-figure,
  .paper-table-wrap,
  .paper-formal,
  .paper-proof {
    break-inside: avoid;
  }

  .paper-abstract {
    border-left-color: #666;
    color: #333;
  }

  .math-block,
  .paper-article .math-block {
    background: #f5f5f5;
    border-color: #ccc;
  }

  a {
    color: #1a57a8;
  }
}