:root {
  --space: #05050f;
  --navy: #0d1b4b;
  --red: #e63b2e;
  --white: #ffffff;
  --cyan: #00bcd4;
  --muted: rgba(255, 255, 255, 0.68);
  --line: rgba(255, 255, 255, 0.18);
  --line-strong: rgba(0, 188, 212, 0.52);
  --panel: rgba(13, 27, 75, 0.42);
  --panel-solid: rgba(7, 10, 26, 0.86);
  --shadow-cyan: 0 0 28px rgba(0, 188, 212, 0.18);
  --ink: var(--white);
  --measure: 72ch;
}

* { box-sizing: border-box; }

html {
  min-height: 100%;
  background: var(--space);
  color: var(--white);
  cursor: none;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background: var(--space);
  font-family: "DM Sans", system-ui, sans-serif;
  letter-spacing: 0.01em;
  line-height: 1.6;
  transition: background 0.4s ease, color 0.4s ease;
}

a, button { cursor: none; }
button { font: inherit; }

/* ---------- Starfield + cursor (ACSA brand) ---------- */
#stars {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  background: var(--space);
}

.cursor-dot, .cursor-ring {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  pointer-events: none;
  transform: translate3d(-50px, -50px, 0);
}
.cursor-dot {
  width: 4px; height: 4px; border-radius: 999px;
  background: var(--red);
  box-shadow: 0 0 12px rgba(230, 59, 46, 0.9);
}
.cursor-ring {
  width: 20px; height: 20px;
  border: 1px solid rgba(255, 255, 255, 0.92);
  border-radius: 999px;
  transition: width 80ms ease, height 80ms ease, border-color 80ms ease;
}
body.cursor-hot .cursor-ring {
  width: 34px; height: 34px;
  border-color: var(--cyan);
  box-shadow: 0 0 18px rgba(0, 188, 212, 0.5);
}
@media (pointer: coarse) {
  html { cursor: auto; }
  a, button { cursor: pointer; }
  .cursor-dot, .cursor-ring { display: none; }
}

/* ---------- Reading progress ---------- */
.read-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  z-index: 60;
  background: linear-gradient(90deg, var(--cyan), var(--red));
  box-shadow: 0 0 12px rgba(0, 188, 212, 0.6);
  transition: width 0.1s linear;
}

/* ---------- Shell ---------- */
.shell {
  position: relative;
  z-index: 2;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.topbar {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px 24px;
}
.brand-link {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--white);
}
.brand-logo {
  width: 52px; height: 52px;
  border-radius: 50%;
  object-fit: contain;
  filter: drop-shadow(0 0 14px rgba(0, 188, 212, 0.22));
}
.brand-text { display: grid; line-height: 1.1; }
.brand-name {
  font-family: "Space Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.brand-sub {
  font-family: "Bebas Neue", sans-serif;
  font-size: 1.5rem;
  letter-spacing: 0.06em;
}
.topbar-actions { display: flex; gap: 10px; align-items: center; }

.pill-link, .pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--white);
  text-decoration: none;
  font-family: "Space Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}
.pill-link:hover, .pill-btn:hover {
  border-color: var(--line-strong);
  color: var(--cyan);
}

/* ---------- Landing ---------- */
.archive-hero {
  padding: 24px 0 8px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 28px;
}
.archive-eyebrow {
  font-family: "Space Mono", monospace;
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 8px;
}
.archive-title {
  font-family: "Bebas Neue", sans-serif;
  font-size: clamp(3rem, 9vw, 6rem);
  letter-spacing: 0.04em;
  line-height: 0.95;
  margin: 0 0 12px;
}
.archive-lede {
  max-width: 64ch;
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 22px;
}

.archive-search {
  position: relative;
  max-width: 420px;
  margin-bottom: 28px;
}
.archive-search input {
  width: 100%;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
  color: var(--white);
  font: inherit;
  outline: none;
}
.archive-search input:focus { border-color: var(--line-strong); }

.paper-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.paper-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(10px);
  text-decoration: none;
  color: var(--white);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.paper-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-cyan);
}
.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  font-family: "Space Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
}
.card-title {
  font-family: "Bebas Neue", sans-serif;
  font-size: 1.7rem;
  letter-spacing: 0.02em;
  line-height: 1.05;
  margin: 0;
}
.card-author { color: var(--muted); font-size: 0.92rem; margin: 0; }
.card-abstract { color: var(--muted); font-size: 0.95rem; margin: 0; flex: 1; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 0.72rem;
  color: var(--muted);
}
.empty-state {
  padding: 60px 20px;
  text-align: center;
  color: var(--muted);
  border: 1px dashed var(--line);
  border-radius: 16px;
}

/* ---------- Paper layout ---------- */
.paper-wrap {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 24px;
  align-self: start;
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  backdrop-filter: blur(10px);
}
.toc h2 {
  font-family: "Space Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 12px;
}
.toc ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.toc a {
  display: block;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
  padding: 4px 0;
  border-left: 2px solid transparent;
  padding-left: 10px;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.toc a:hover { color: var(--white); }
.toc a.active { color: var(--cyan); border-left-color: var(--cyan); }
.toc .lvl-3 { padding-left: 22px; font-size: 0.82rem; }
.toc .lvl-4 { padding-left: 34px; font-size: 0.8rem; }

.article-col { min-width: 0; }

.paper-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.paper-header { border-bottom: 1px solid var(--line); padding-bottom: 24px; margin-bottom: 28px; }
.paper-kicker {
  font-family: "Space Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 12px;
}
.paper-title {
  font-family: "Bebas Neue", sans-serif;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  letter-spacing: 0.02em;
  line-height: 0.98;
  margin: 0 0 16px;
}
.paper-byline { display: grid; gap: 4px; margin-bottom: 16px; }
.paper-author { font-size: 1.1rem; font-weight: 700; }
.paper-affil { color: var(--muted); font-size: 0.95rem; }
.paper-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-family: "Space Mono", monospace;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.paper-facts strong { color: var(--white); font-weight: 700; }
.paper-facts .tag-row { text-transform: none; letter-spacing: normal; }

.paper-abstract {
  border-left: 3px solid var(--cyan);
  padding: 4px 0 4px 18px;
  margin: 0 0 32px;
  color: var(--muted);
  font-size: 1.08rem;
}
.paper-abstract strong {
  display: block;
  font-family: "Space Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 8px;
}

/* ---------- Article typography ---------- */
.article {
  max-width: var(--measure);
  font-size: 1.06rem;
}
.article h2, .article h3, .article h4 {
  font-family: "Bebas Neue", sans-serif;
  letter-spacing: 0.03em;
  line-height: 1.1;
  scroll-margin-top: 24px;
  position: relative;
}
.article h2 { font-size: 2rem; margin: 2.2em 0 0.6em; padding-bottom: 0.2em; border-bottom: 1px solid var(--line); }
.article h3 { font-size: 1.5rem; margin: 1.8em 0 0.5em; }
.article h4 { font-size: 1.2rem; margin: 1.5em 0 0.5em; font-family: "DM Sans", sans-serif; font-weight: 700; letter-spacing: 0.02em; }
.heading-anchor {
  margin-left: 10px;
  color: var(--line-strong);
  text-decoration: none;
  opacity: 0;
  font-family: "DM Sans", sans-serif;
  font-size: 0.7em;
  transition: opacity 0.15s ease;
}
.article h2:hover .heading-anchor,
.article h3:hover .heading-anchor,
.article h4:hover .heading-anchor { opacity: 1; }

.article p { margin: 0 0 1.2em; }
.article a { color: var(--cyan); text-decoration: underline; text-underline-offset: 3px; }
.article strong { color: var(--white); }
.article ul, .article ol { margin: 0 0 1.2em; padding-left: 1.4em; }
.article li { margin: 0.35em 0; }
.article blockquote {
  margin: 1.6em 0;
  padding: 14px 20px;
  border-left: 3px solid var(--red);
  background: rgba(255, 255, 255, 0.03);
  border-radius: 0 10px 10px 0;
  color: var(--muted);
  font-style: italic;
}
.article code {
  font-family: "Space Mono", monospace;
  font-size: 0.88em;
  background: rgba(0, 188, 212, 0.12);
  padding: 2px 6px;
  border-radius: 6px;
}
.article pre {
  background: var(--panel-solid);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
  overflow-x: auto;
  margin: 1.6em 0;
}
.article pre code { background: none; padding: 0; font-size: 0.9rem; }
.article img { max-width: 100%; height: auto; border-radius: 12px; margin: 1.6em 0; }
.article hr { border: 0; border-top: 1px solid var(--line); margin: 2.4em 0; }

.article table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.6em 0;
  font-size: 0.96rem;
}
.article th, .article td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
}
.article thead th {
  font-family: "Space Mono", monospace;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cyan);
  border-bottom-color: var(--line-strong);
}

/* ---------- Cite block ---------- */
.cite-block {
  margin: 40px 0 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
}
.cite-block h2 {
  font-family: "Space Mono", monospace;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 12px;
}
.cite-text {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.7;
  word-break: break-word;
}
.cite-doi { display: inline-block; margin-top: 10px; color: var(--cyan); }

/* ---------- Prev/Next ---------- */
.paper-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 44px;
}
.paper-nav a {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  text-decoration: none;
  color: var(--white);
  background: var(--panel);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.paper-nav a:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.paper-nav .dir {
  font-family: "Space Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}
.paper-nav .next-link { text-align: right; }
.paper-nav .pn-title { font-weight: 700; }

.copy-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--panel-solid);
  border: 1px solid var(--line-strong);
  color: var(--white);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.85rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 80;
}
.copy-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Light reading mode ---------- */
body.theme-light {
  --space: #eef0f5;
  --white: #11141c;
  --muted: rgba(17, 20, 28, 0.66);
  --line: rgba(17, 20, 28, 0.14);
  --line-strong: rgba(0, 134, 153, 0.5);
  --cyan: #0a7d8c;
  --panel: #ffffff;
  --panel-solid: #ffffff;
  --shadow-cyan: 0 12px 30px rgba(0, 0, 0, 0.1);
}
body.theme-light #stars { display: none; }
body.theme-light { background: var(--space); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .paper-wrap { grid-template-columns: 1fr; gap: 24px; }
  .toc {
    position: static;
    max-height: none;
    order: -1;
  }
}
@media (max-width: 560px) {
  .topbar { flex-wrap: wrap; }
  .paper-nav { grid-template-columns: 1fr; }
  .paper-nav .next-link { text-align: left; }
  .shell { padding: 0 16px 60px; }
  .topbar { padding: 16px; }
}

/* ---------- Figures (image placeholders) ---------- */
.paper-figure { margin: 2em 0; text-align: center; }
.figure-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 220px;
  border: 1px dashed var(--line-strong);
  border-radius: 12px;
  background:
    repeating-linear-gradient(45deg, rgba(0,188,212,0.04) 0 12px, rgba(0,188,212,0.08) 12px 24px);
  color: var(--muted);
  font-family: "Space Mono", monospace;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.figure-placeholder.cover { min-height: 150px; max-width: 280px; margin: 0 auto 24px; border-radius: 50%; aspect-ratio: 1; }
.paper-figure figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.9rem;
}
.paper-figure figcaption strong { color: var(--cyan); }

/* ---------- Title block ---------- */
.doc-titleblock {
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
  margin-bottom: 32px;
  background: var(--panel);
}
.doc-subtitle { font-style: italic; font-size: 1.15rem; margin: 0 0 6px; }
.doc-guide { color: var(--muted); margin: 0 0 14px; }
.doc-id {
  font-family: "Space Mono", monospace;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin: 0 0 4px;
}
.doc-quote { font-style: italic; color: var(--muted); margin: 12px 0 0; }

/* ---------- Footnote markers + checklists ---------- */
.article sup { color: var(--cyan); font-size: 0.7em; }
.article input[type="checkbox"] {
  margin-right: 8px;
  accent-color: var(--cyan);
  width: 15px; height: 15px;
  vertical-align: middle;
}
.article li.task { list-style: none; }
.article ul:has(input[type="checkbox"]) { padding-left: 0.4em; }

/* ---------- Print / PDF ---------- */
@media print {
  html { cursor: auto; background: #fff; }
  body { background: #fff; color: #000; }
  #stars, .cursor-dot, .cursor-ring, .read-progress,
  .topbar, .paper-toolbar, .toc, .paper-nav, .copy-toast { display: none !important; }
  .shell { max-width: none; padding: 0; }
  .paper-wrap { display: block; }
  .article { max-width: none; font-size: 11.5pt; color: #000; }
  .article a { color: #000; }
  .paper-title, .article h2, .article h3, .article h4 { color: #000; }
  .paper-abstract { color: #222; border-color: #888; }
  .article pre, .cite-block { background: #f4f4f4; border-color: #ccc; }
  .article th { color: #000; }
}