/* ============================================================
   ZEanth Laboratory — Paper Archive
   Shared stylesheet (listing + abstract + PDF viewer pages)
   ============================================================ */

:root {
  --bg: #ffffff;
  --fg: #0a0a0a;
  --muted: #6b6b6b;
  --faint: #9a9a9a;
  --line: #e8e8e8;
  --hover: #f5f5f5;
  --accent: #0a0a0a;

  /* status accents — desaturated, minimal, one hue each */
  --st-preprint: #6b6b6b;
  --st-review: #a17a1c;
  --st-accepted: #1c6b4f;
  --st-published: #1c4fa1;
  --st-withdrawn: #a12c2c;

  --radius: 8px;
  --max-w: 880px;

  /* PDF viewer */
  --viewport-bg: #525659;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--fg);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a { color: inherit; }

.wrap {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.mono {
  font-family: 'JetBrains Mono', monospace;
}

/* ---------------- Header ---------------- */
header {
  padding: 56px 0 36px;
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 18px;
  text-decoration: none;
  color: var(--fg);
}
.brand img {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  object-fit: cover;
  transition: transform 0.3s ease;
}
.brand:hover img { transform: scale(1.04); }
.brand-text { display: flex; flex-direction: column; gap: 2px; }
.brand-name {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.brand-subtitle {
  font-size: 12.5px;
  color: var(--muted);
  letter-spacing: -0.01em;
  font-style: italic;
}
.header-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
}
.brand-updated {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.header-nav {
  display: flex;
  gap: 16px;
  font-size: 13px;
}
.header-nav a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.header-nav a:hover { color: var(--fg); border-color: var(--fg); }

/* ---------------- Search & filters ---------------- */
.search-bar { margin: 32px 0 16px; position: relative; }
.search-bar input {
  width: 100%;
  padding: 12px 16px 12px 42px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--fg);
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: border 0.2s;
}
.search-bar input:focus { border-color: var(--fg); }
.search-bar svg {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--muted);
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.filter-select {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 7px 10px;
  outline: none;
  cursor: pointer;
  transition: border 0.2s;
}
.filter-select:focus, .filter-select:hover { border-color: var(--fg); }

.result-count {
  font-size: 12.5px;
  color: var(--muted);
  margin-bottom: 20px;
  font-family: 'JetBrains Mono', monospace;
}

/* ---------------- Badges ---------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid currentColor;
  white-space: nowrap;
}
.badge::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
}
.badge-preprint  { color: var(--st-preprint); }
.badge-under-review { color: var(--st-review); }
.badge-accepted  { color: var(--st-accepted); }
.badge-published { color: var(--st-published); }
.badge-withdrawn { color: var(--st-withdrawn); }

.tag {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--muted);
  background: var(--hover);
  border-radius: 4px;
  padding: 2px 7px;
  letter-spacing: 0.01em;
}

.paper-id {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  color: var(--muted);
  letter-spacing: -0.01em;
}

/* ---------------- Papers list ---------------- */
.papers { display: flex; flex-direction: column; flex: 1; }
.paper {
  display: grid;
  grid-template-columns: 108px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
  transition: background 0.2s;
}
.paper:first-child { border-top: 1px solid var(--line); }
.paper:hover { background: var(--hover); margin: 0 -12px; padding-left: 12px; padding-right: 12px; border-radius: 6px; }

.paper-idcol { display: flex; flex-direction: column; gap: 6px; padding-top: 4px; }
.paper-body { min-width: 0; }
.paper-title {
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.35;
  margin-bottom: 6px;
  color: var(--fg);
  text-decoration: none;
  display: block;
}
.paper-title:hover { text-decoration: underline; }
.paper-meta { font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.paper-meta .venue {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.paper-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.paper-abstract {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.paper-links { display: flex; gap: 14px; font-size: 13px; flex-wrap: wrap; }
.paper-links a {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1px;
  transition: border 0.2s;
}
.paper-links a:hover { border-color: var(--fg); }
.paper-links .disabled {
  color: var(--faint);
  border-bottom: 1px dashed var(--line);
  cursor: default;
}

/* ---------------- Empty state ---------------- */
.empty {
  padding: 96px 24px;
  text-align: center;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  animation: fadeIn 0.5s ease both;
}
.empty-icon { width: 56px; height: 56px; margin: 0 auto 20px; color: var(--muted); opacity: 0.6; }
.empty-title { font-size: 16px; font-weight: 500; color: var(--fg); margin-bottom: 6px; letter-spacing: -0.01em; }
.empty-sub { font-size: 13px; color: var(--muted); line-height: 1.6; max-width: 360px; margin: 0 auto; }
.empty-query {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--muted);
  background: var(--hover);
  padding: 2px 8px;
  border-radius: 4px;
}

/* ---------------- Pagination ---------------- */
.pagination { display: flex; justify-content: center; align-items: center; gap: 8px; padding: 32px 0; margin-top: auto; }
.pagination-btn {
  background: none;
  border: 1px solid var(--line);
  color: var(--fg);
  padding: 8px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
}
.pagination-btn:hover:not(:disabled) { background: var(--hover); border-color: var(--fg); }
.pagination-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.pagination-btn svg { width: 14px; height: 14px; }
.pagination-numbers { display: flex; gap: 4px; }
.page-num {
  background: none;
  border: 1px solid transparent;
  color: var(--muted);
  width: 36px;
  height: 36px;
  border-radius: 6px;
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-num:hover { background: var(--hover); color: var(--fg); }
.page-num.active { background: var(--fg); color: var(--bg); border-color: var(--fg); }

/* ---------------- Footer ---------------- */
footer {
  padding: 40px 0 48px;
  border-top: 1px solid var(--line);
  margin-top: 32px;
  font-size: 12px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: -0.02em;
  flex-wrap: wrap;
  gap: 8px;
}
footer a { color: var(--muted); text-decoration: none; transition: color 0.2s; }
footer a:hover { color: var(--fg); }

/* ---------------- Abstract (single paper) page ---------------- */
.breadcrumb {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  color: var(--muted);
  margin: 28px 0 20px;
  transition: color 0.2s;
}
.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}
.breadcrumb a:hover { color: var(--fg); }

.abs-header { padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.abs-idline {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.abs-title {
  font-size: 25px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.35;
  margin-bottom: 14px;
}
.abs-authors { font-size: 15px; color: var(--fg); margin-bottom: 10px; }
.abs-authors .muted { color: var(--muted); }
.abs-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }

.abs-section { padding: 28px 0; border-bottom: 1px solid var(--line); }
.abs-section:last-of-type { border-bottom: none; }
.abs-section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 12px;
}
.abs-abstract { font-size: 15.5px; line-height: 1.75; color: var(--fg); }

.abs-fields { display: grid; grid-template-columns: 140px 1fr; row-gap: 10px; column-gap: 16px; font-size: 13.5px; }
.abs-fields dt { color: var(--muted); font-family: 'JetBrains Mono', monospace; font-size: 12px; }
.abs-fields dd { color: var(--fg); }

.abs-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 6px;
  border: 1px solid var(--line);
  text-decoration: none;
  color: var(--fg);
  font-size: 13.5px;
  font-family: 'JetBrains Mono', monospace;
  transition: all 0.2s;
  cursor: pointer;
  background: var(--bg);
}
.btn:hover { border-color: var(--fg); background: var(--hover); }
.btn-primary { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.btn-primary:hover { opacity: 0.85; background: var(--fg); }
.btn:disabled, .btn.disabled {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
}
.btn svg { width: 15px; height: 15px; }

.history-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.history-table th, .history-table td {
  text-align: left;
  padding: 8px 12px 8px 0;
  border-bottom: 1px solid var(--line);
}
.history-table th {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  font-weight: 500;
}
.history-table tr:last-child td { border-bottom: none; }

.bibtex-box {
  position: relative;
  background: var(--hover);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--fg);
}
.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 5px 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  cursor: pointer;
  color: var(--fg);
  transition: all 0.2s;
}
.copy-btn:hover { border-color: var(--fg); }
.copy-btn.copied { color: var(--st-accepted); border-color: var(--st-accepted); }

.pdf-pending {
  font-size: 13px;
  color: var(--muted);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 12px 16px;
}

/* ---------------- PDF Viewer page ---------------- */
body.pdf-viewer-body {
  min-height: 100vh;
}
body.pdf-viewer-body .wrap {
  max-width: 100%;
  padding: 0;
}
body.pdf-viewer-body header {
  padding: 28px 32px 20px;
  border-bottom: 1px solid var(--line);
}
body.pdf-viewer-body .breadcrumb {
  margin: 0;
  padding: 14px 32px;
  border-bottom: 1px solid var(--line);
}
body.pdf-viewer-body footer {
  margin-top: 0;
  padding: 20px 32px;
}

.pdf-toolbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 32px;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  gap: 16px;
}
.pdf-toolbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  flex: 1;
}
.pdf-toolbar-title {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--fg);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -0.01em;
}
.pdf-toolbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.pdf-toolbar .version-select {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 6px 8px;
  outline: none;
  cursor: pointer;
  transition: border 0.2s;
}
.pdf-toolbar .version-select:focus,
.pdf-toolbar .version-select:hover { border-color: var(--fg); }
.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--fg);
  color: var(--bg);
  border: none;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  font-family: 'JetBrains Mono', monospace;
  border-radius: 5px;
  cursor: pointer;
  transition: opacity 0.2s;
  letter-spacing: -0.01em;
}
.btn-download:hover { opacity: 0.85; }
.btn-download:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-download svg { width: 14px; height: 14px; fill: currentColor; }

.pdf-viewport {
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  background: var(--viewport-bg);
  min-height: 50vh;
}
.pdf-page-canvas {
  background: #fff;
  box-shadow: 0 2px 16px rgba(0,0,0,0.22);
  max-width: 100%;
  height: auto !important;
}

/* PDF loading & error states */
.pdf-loading {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 20;
  gap: 14px;
  font-size: 13.5px;
  color: var(--muted);
  font-family: 'JetBrains Mono', monospace;
}
.spinner {
  width: 22px; height: 22px;
  border: 2px solid var(--line);
  border-top: 2px solid var(--fg);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.pdf-error { color: #c33; text-align: center; max-width: 420px; line-height: 1.6; }
.pdf-error a { color: var(--fg); }

/* ---------------- Animations ---------------- */
.paper { animation: fadeUp 0.4s ease both; }
.paper:nth-child(1) { animation-delay: 0.02s; }
.paper:nth-child(2) { animation-delay: 0.06s; }
.paper:nth-child(3) { animation-delay: 0.10s; }
.paper:nth-child(4) { animation-delay: 0.14s; }
.paper:nth-child(5) { animation-delay: 0.18s; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* ---------------- Responsive ---------------- */
@media (max-width: 560px) {
  .wrap { padding: 0 20px; }
  header { padding: 36px 0 28px; }
  .brand img { width: 48px; height: 48px; }
  .brand-name { font-size: 18px; }
  .brand-subtitle { font-size: 11px; }
  .brand-updated { font-size: 10.5px; }
  .paper { grid-template-columns: 1fr; gap: 10px; }
  .paper-idcol { flex-direction: row; align-items: center; gap: 10px; }
  .paper-title { font-size: 16px; }
  .abs-title { font-size: 20px; }
  .abs-fields { grid-template-columns: 1fr; row-gap: 4px; }
  .abs-fields dt { margin-top: 8px; }
  footer { flex-direction: column; gap: 8px; }
  .pagination { flex-wrap: wrap; }
  .pagination-numbers { order: 3; width: 100%; justify-content: center; margin-top: 8px; }

  /* PDF viewer responsive */
  body.pdf-viewer-body header { padding: 20px 16px 16px; }
  body.pdf-viewer-body .breadcrumb { padding: 10px 16px; }
  body.pdf-viewer-body footer { padding: 16px; }
  .pdf-toolbar { padding: 10px 16px; }
  .pdf-toolbar-title { font-size: 12px; }
  .pdf-viewport { padding: 12px; gap: 8px; }
}

/* ---------------- Toast notifications ---------------- */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  padding: 10px 20px;
  border-radius: 6px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 1000;
  white-space: nowrap;
}
.toast-show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.toast-success {
  background: var(--fg);
  color: var(--bg);
}
.toast-error {
  background: var(--st-withdrawn);
  color: #fff;
}

/* ---------------- License section ---------------- */
.license-info {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--fg);
}
.license-info a {
  color: var(--fg);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: border 0.2s;
}
.license-info a:hover {
  border-color: var(--fg);
}
.license-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 4px;
  border: 1px solid var(--line);
  color: var(--muted);
  margin-right: 8px;
}

/* ---------------- History version link ---------------- */
.history-table .version-link {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1px;
  transition: border 0.2s, color 0.2s;
}
.history-table .version-link:hover {
  color: var(--fg);
  border-color: var(--fg);
}