:root {
  color-scheme: dark;
  /* The same colors and fonts as the kernel-space half of sutwalprince.in. */
  --bg: #0c0a09;
  --surface: #1a1716;
  --surface-2: #141211;
  --border: #33302d;
  --border-strong: #57534e;
  --ink: #f5f5f4;
  --ink-muted: #a8a29e;
  --ink-faint: #8f8880;
  --accent: #f5f5f4;
  --accent-ink: #f5f5f4;
  --on-accent: #0c0a09;
  --accent-soft: #292524;
  --accent-2: #93a7ff;
  --on-accent-2: #14162a;
  --accent-2-soft: #1e2140;
  --danger: #f87171;
  --valid: #6ee7a8;
  --radius: 0;
  --mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  --sans: 'IBM Plex Sans', system-ui, sans-serif;
  --shadow-card: none;
  --shadow-card-hover: none;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 28px;
}

a { color: var(--accent-ink); }
a:hover { color: var(--accent); }

button, select, input {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- header ---------- */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.header-inner {
  padding: 30px 28px 22px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.brand-mark {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 22px;
  font-weight: 600;
}

.site-header h1 {
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0;
}

.site-home {
  display: inline-block;
  margin-bottom: 18px;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
}

.site-home:hover { text-decoration: underline; text-underline-offset: 4px; }

.tagline {
  margin: 6px 0 0;
  color: var(--ink-muted);
  font-size: 14.5px;
}

.header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.dirty-indicator {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--accent-2);
}

.btn {
  font-family: var(--mono);
  font-size: 12.5px;
  border-radius: var(--radius);
  padding: 8px 13px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

a.btn { display: inline-block; text-decoration: none; }
.btn[hidden], .header-actions .btn[hidden] { display: none; }

.btn-ghost {
  background: none;
  border-color: var(--border-strong);
  color: var(--ink-muted);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-ink); }

.btn-solid {
  background: var(--accent);
  color: var(--on-accent);
}
.btn-solid:hover { background: var(--ink-muted); }

.btn-danger {
  background: none;
  border-color: var(--danger);
  color: var(--danger);
}
.btn-danger:hover { background: var(--danger); color: var(--on-accent); }

/* ---------- layout ---------- */

.layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 40px;
  padding-top: 32px;
  padding-bottom: 64px;
  align-items: start;
}

/* ---------- sidebar / search ---------- */

.sidebar {
  position: sticky;
  top: 24px;
}

.search-label {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 6px;
}

.search-input-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 9px 12px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.search-input-wrap:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.prompt-glyph {
  font-size: 11px;
  color: var(--accent);
  flex-shrink: 0;
}

#search-input {
  border: none;
  outline: none;
  background: transparent;
  width: 100%;
  font-family: var(--mono);
  font-size: 13.5px;
}

#search-input::placeholder { color: var(--ink-faint); }

.facet-groups {
  margin-top: 26px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.facet-group {
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.facet-group summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-muted);
  padding: 2px 0;
}

.facet-group summary::-webkit-details-marker { display: none; }

.facet-group summary .chevron {
  font-size: 9px;
  color: var(--ink-faint);
  transition: transform 0.15s ease;
}

.facet-group[open] summary .chevron { transform: rotate(90deg); }

.facet-options {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.facet-option {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  cursor: pointer;
  color: var(--ink);
}

.facet-option input {
  accent-color: var(--accent);
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.facet-option .count {
  margin-left: auto;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 11.5px;
}

.facet-option.is-zero {
  color: var(--ink-faint);
}

.clear-all {
  margin-top: 20px;
  background: none;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 8px 12px;
  width: 100%;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-muted);
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.clear-all:hover {
  border-color: var(--accent);
  color: var(--accent-ink);
}

/* ---------- category filter (public) ---------- */

.category-filter {
  margin-top: 22px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.category-filter-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 10px;
}

.category-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.category-chip {
  font-family: var(--mono);
  font-size: 12px;
  border: 1px solid var(--border-strong);
  border-radius: 0;
  padding: 6px 12px;
  background: var(--surface);
  color: var(--ink-muted);
  cursor: pointer;
  transition: all 0.18s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.category-chip:hover {
  border-color: var(--accent);
  color: var(--accent-ink);
  background: var(--accent-soft);
}

.category-chip.is-active {
  background: var(--accent);
  color: var(--on-accent);
  border-color: var(--accent);
}

.category-chip.is-active:hover {
  background: var(--ink-muted);
  border-color: var(--ink-muted);
}

.category-count {
  font-size: 10.5px;
  opacity: 0.7;
  font-weight: 500;
}

.category-chip.is-active .category-count {
  opacity: 0.85;
}

/* ---------- category badge on cards ---------- */

.category-badge {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--on-accent-2);
  background: var(--accent-2);
  border-radius: 0;
  padding: 4px 9px;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.card-top-badges {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  flex-shrink: 0;
}

/* ---------- results toolbar ---------- */

.results-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 14px;
}

.results-count {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-muted);
}

.results-count .num { color: var(--accent-ink); font-weight: 600; }

.sort-block {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

#sort-select {
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 5px 8px;
  font-size: 12.5px;
  text-transform: none;
  letter-spacing: normal;
  color: var(--ink);
}

/* ---------- active filter chips ---------- */

.active-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.active-filters:empty { margin-bottom: 0; }

.flag-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-2-soft);
  color: var(--accent-2);
  border-radius: 0;
  padding: 5px 8px 5px 10px;
  font-family: var(--mono);
  font-size: 12px;
  white-space: nowrap;
}

.flag-chip button {
  background: none;
  border: none;
  color: var(--accent-2);
  cursor: pointer;
  font-size: 13px;
  line-height: 1;
  padding: 0;
  opacity: 0.65;
}

.flag-chip button:hover { opacity: 1; }

/* ---------- paper cards ---------- */

.paper-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.paper-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-2);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.15s ease, transform 0.15s ease, background 0.5s ease, border-color 0.5s ease;
}

.paper-card:hover {
  border-color: var(--border-strong);
  border-left-color: var(--accent-2);
}

.paper-card.just-saved {
  background: var(--accent-soft);
  border-left-color: var(--ink);
}

.card-admin {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
  display: flex;
  gap: 14px;
}

.admin-btn {
  background: none;
  border: none;
  padding: 0;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-faint);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.admin-btn:hover { color: var(--accent-ink); }
.delete-btn:hover { color: var(--danger); }

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.card-title {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.35;
  margin: 0;
}

.card-title a { color: var(--ink); text-decoration: none; }
.card-title a:hover { color: var(--accent-2); text-decoration: underline; }

.venue-badge {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--accent-ink);
  background: var(--accent-soft);
  border-radius: 0;
  padding: 4px 8px;
  white-space: nowrap;
}

.card-authors {
  margin: 6px 0 0;
  color: var(--ink-muted);
  font-size: 13px;
}

.card-summary {
  margin: 10px 0 0;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.55;
}

.card-tags {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 3px 7px;
  cursor: pointer;
}

.tag:hover {
  border-color: var(--accent);
  color: var(--accent-ink);
}

.card-more {
  margin-top: 12px;
}

.card-more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--accent-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-more summary::-webkit-details-marker { display: none; }

.more-body {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.more-field-label {
  font-family: var(--mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  margin-bottom: 4px;
}

.reasoning-item {
  font-size: 13px;
  color: var(--ink-muted);
  margin: 3px 0;
}

.reasoning-item b { color: var(--ink); font-weight: 600; }

.card-links {
  margin-top: 12px;
  display: flex;
  gap: 14px;
}

.card-links a {
  font-family: var(--mono);
  font-size: 12px;
  text-decoration: none;
  color: var(--accent-2);
}

.card-links a:hover { text-decoration: underline; }

/* ---------- empty state ---------- */

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--ink-muted);
}

.empty-state p { margin: 4px 0; }

.empty-state button {
  margin-top: 14px;
  background: var(--accent);
  color: var(--on-accent);
  border: none;
  border-radius: var(--radius);
  padding: 9px 16px;
  font-family: var(--mono);
  font-size: 12.5px;
  cursor: pointer;
}

.empty-state button:hover { background: var(--ink-muted); }

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px 0 40px;
}

.site-footer p {
  color: var(--ink-faint);
  font-size: 12.5px;
  font-family: var(--mono);
}

.site-footer code {
  background: var(--accent-soft);
  color: var(--accent-ink);
  padding: 1px 5px;
  border-radius: 0;
}

/* ---------- add / edit modal ---------- */

.paper-modal {
  border: 1px solid var(--border-strong);
  border-radius: 0;
  padding: 0;
  width: min(600px, 92vw);
  max-height: 86vh;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
  background: var(--surface);
  color: var(--ink);
}

.paper-modal::backdrop {
  background: rgba(0, 0, 0, 0.45);
}

.modal-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  border-bottom: 1px solid var(--border);
}

.modal-head h2 {
  font-family: var(--mono);
  font-size: 16px;
  margin: 0;
}

.modal-close-x {
  background: none;
  border: none;
  font-size: 20px;
  line-height: 1;
  color: var(--ink-faint);
  cursor: pointer;
}
.modal-close-x:hover { color: var(--ink); }

.paper-form {
  padding: 18px 22px;
  overflow-y: auto;
  max-height: calc(86vh - 130px);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.form-error {
  background: #2a1513;
  color: #fca5a5;
  border: 1px solid #7f1d1d;
  border-radius: var(--radius);
  padding: 9px 12px;
  font-size: 13px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
  flex: 1;
  min-width: 0;
}

.field-narrow { flex: 0 0 100px; }

.field-row {
  display: flex;
  gap: 12px;
}

.field-label {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

.field-label em {
  font-style: normal;
  text-transform: none;
  letter-spacing: normal;
  color: var(--ink-faint);
  opacity: 0.8;
}

.field input,
.field textarea {
  width: 100%;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 8px 10px;
  font-size: 13.5px;
  font-family: var(--sans);
  background: var(--surface-2);
  color: var(--ink);
  resize: vertical;
}

.field input:focus,
.field textarea:focus,
.field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.field select {
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 8px 10px;
  font-size: 13.5px;
  font-family: var(--sans);
  background: var(--surface);
  cursor: pointer;
  appearance: auto;
}

/* ---------- category checkboxes in modal ---------- */

.category-checkboxes {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 4px 0;
}

.cat-checkbox {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-family: var(--mono);
  color: var(--ink-muted);
  cursor: pointer;
  padding: 5px 10px;
  border: 1px solid var(--border-strong);
  border-radius: 0;
  transition: all 0.15s ease;
  user-select: none;
}

.cat-checkbox:hover {
  border-color: var(--accent);
  color: var(--accent-ink);
}

.cat-checkbox:has(input:checked) {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.cat-checkbox input {
  accent-color: var(--accent);
  width: 13px;
  height: 13px;
  margin: 0;
}

.mono-textarea {
  font-family: var(--mono);
  font-size: 12.5px;
}

.modal-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 22px;
  border-top: 1px solid var(--border);
}

.modal-foot-right {
  display: flex;
  gap: 10px;
  margin-left: auto;
}

/* ---------- JSON import modal ---------- */

.json-import-modal {
  width: min(720px, 94vw);
}

.json-icon {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--accent);
  margin-right: 4px;
}

.json-import-body {
  padding: 20px 22px;
  overflow-y: auto;
  max-height: calc(86vh - 130px);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.json-import-instructions {
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.instruction-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-ink);
}

.instruction-icon {
  font-size: 16px;
  color: var(--accent);
}

.instruction-detail {
  margin: 8px 0 0;
  font-size: 12.5px;
  color: var(--ink-muted);
  line-height: 1.5;
}

.instruction-detail code {
  background: var(--surface-2);
  color: var(--accent-ink);
  padding: 1px 5px;
  border-radius: 0;
  font-family: var(--mono);
  font-size: 11.5px;
}

/* --- JSON editor area --- */

.json-editor-wrap {
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.json-editor-wrap:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.json-editor-wrap.has-error {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.15);
}

.json-editor-wrap.is-valid {
  border-color: var(--valid);
  box-shadow: 0 0 0 3px rgba(110, 231, 168, 0.15);
}

.json-editor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}

.json-editor-label {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
}

.json-editor-actions {
  display: flex;
  gap: 4px;
}

.json-action-btn {
  background: none;
  border: 1px solid transparent;
  border-radius: 0;
  padding: 3px 8px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
  cursor: pointer;
  transition: all 0.15s ease;
}

.json-action-btn:hover {
  background: var(--surface);
  border-color: var(--border-strong);
  color: var(--ink-muted);
}

.json-import-textarea {
  display: block;
  width: 100%;
  border: none;
  outline: none;
  resize: vertical;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.6;
  padding: 14px 16px;
  background: var(--surface-2);
  color: var(--ink);
  min-height: 200px;
  tab-size: 2;
}

.json-import-textarea::placeholder {
  color: var(--ink-faint);
  opacity: 0.6;
}

.json-status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 12px;
  background: var(--surface-2);
  border-top: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 11px;
}

.json-status {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--ink-faint);
  transition: color 0.2s ease;
}

.json-status::before {
  content: '';
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink-faint);
  transition: background 0.2s ease;
}

.json-status.status-valid { color: var(--valid); }
.json-status.status-valid::before { background: var(--valid); }

.json-status.status-error { color: var(--danger); }
.json-status.status-error::before { background: var(--danger); }

.json-char-count {
  color: var(--ink-faint);
}

/* --- JSON preview --- */

.json-preview {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  animation: slideDown 0.2s ease;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.json-preview-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.preview-icon {
  font-size: 9px;
  color: var(--accent);
}

.json-preview-content {
  padding: 14px 16px;
  background: var(--surface);
}

.json-preview-content .preview-title {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 10px;
}

.json-preview-content .preview-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.json-preview-content .preview-meta-item {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.json-preview-content .preview-meta-item .meta-label {
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.json-preview-content .preview-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 8px;
}

.json-preview-content .preview-tags .tag {
  cursor: default;
}

.json-preview-content .preview-field-count {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
  padding-top: 10px;
  border-top: 1px dashed var(--border);
}

/* --- JSON import success toast --- */

.json-import-toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--ink);
  color: var(--on-accent);
  padding: 14px 20px;
  border-radius: 0;
  font-family: var(--mono);
  font-size: 13px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  z-index: 9999;
  animation: toastIn 0.3s ease, toastOut 0.3s ease 2.2s forwards;
  display: flex;
  align-items: center;
  gap: 10px;
}

.json-import-toast .toast-icon {
  font-size: 16px;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(12px); }
}

/* ---------- mobile filter toggle ---------- */

.sidebar-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 10px 16px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-muted);
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
  width: 100%;
  justify-content: center;
}

.sidebar-toggle:hover {
  border-color: var(--accent);
  color: var(--accent-ink);
}

.toggle-icon {
  font-size: 16px;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 999;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.sidebar-overlay.is-visible {
  display: block;
  opacity: 1;
}

/* ---------- responsive: tablet (≤880px) ---------- */

@media (max-width: 880px) {
  .wrap {
    padding: 0 20px;
  }

  .layout {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .sidebar {
    position: static;
  }

  .card-top {
    flex-direction: column;
    gap: 6px;
  }

  .header-inner {
    padding: 20px 20px 16px;
  }

  .header-actions {
    flex-wrap: wrap;
    gap: 8px;
  }
}

/* ---------- responsive: mobile (≤640px) ---------- */

@media (max-width: 640px) {
  .wrap {
    padding: 0 14px;
  }

  /* --- Header --- */
  .header-inner {
    padding: 16px 14px 14px;
  }

  .header-row {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .brand {
    justify-content: center;
  }

  .site-header h1 {
    font-size: 20px;
  }

  .brand-mark {
    font-size: 18px;
  }

  .site-home {
  display: inline-block;
  margin-bottom: 18px;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
}

.site-home:hover { text-decoration: underline; text-underline-offset: 4px; }

.tagline {
    text-align: center;
    font-size: 12.5px;
    line-height: 1.45;
  }

  .header-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .header-actions .btn {
    font-size: 11.5px;
    padding: 10px 10px;
    text-align: center;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .header-actions .dirty-indicator {
    grid-column: 1 / -1;
    text-align: center;
  }

  /* The add paper btn spans full width on its own row */
  .header-actions #add-paper-btn {
    grid-column: 1 / -1;
  }

  /* --- Sidebar as slide-in drawer --- */
  .sidebar-toggle {
    display: flex;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(320px, 85vw);
    z-index: 1000;
    background: var(--surface);
    padding: 20px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.15);
    border-right: 1px solid var(--border);
  }

  .sidebar.is-open {
    transform: translateX(0);
  }

  .sidebar .facet-group {
    padding: 14px 0;
  }

  .sidebar .facet-option {
    min-height: 40px;
    padding: 4px 0;
  }

  .sidebar .clear-all {
    min-height: 44px;
    font-size: 13px;
  }

  /* --- Layout --- */
  .layout {
    padding-top: 16px;
    padding-bottom: 40px;
    gap: 14px;
  }

  /* --- Results toolbar --- */
  .results-toolbar {
    flex-direction: column;
    gap: 10px;
    align-items: stretch;
    margin-bottom: 12px;
  }

  .sort-block {
    justify-content: space-between;
  }

  #sort-select {
    flex: 1;
    min-height: 40px;
    font-size: 13px;
  }

  /* --- Cards --- */
  .paper-list {
    gap: 12px;
  }

  .paper-card {
    padding: 14px 14px;
    border-left-width: 3px;
  }

  .card-title {
    font-size: 14px;
    line-height: 1.4;
  }

  .card-authors {
    font-size: 12px;
  }

  .card-summary {
    font-size: 13px;
    line-height: 1.5;
  }

  .card-tags {
    margin-top: 10px;
    gap: 5px;
  }

  .tag {
    font-size: 10.5px;
    padding: 4px 7px;
  }

  .card-links {
    margin-top: 10px;
    gap: 10px;
    flex-wrap: wrap;
  }

  .card-links a {
    font-size: 11.5px;
    min-height: 36px;
    display: inline-flex;
    align-items: center;
  }

  .card-admin {
    margin-top: 10px;
    padding-top: 10px;
  }

  .admin-btn {
    min-height: 36px;
    font-size: 12px;
    padding: 4px 8px;
  }

  .card-more summary {
    min-height: 36px;
    display: inline-flex;
    align-items: center;
  }

  /* --- Active filter chips --- */
  .active-filters {
    gap: 6px;
    margin-bottom: 12px;
  }

  .flag-chip {
    font-size: 11px;
    padding: 6px 8px 6px 10px;
  }

  /* --- Modals: near-full-screen on mobile --- */
  .paper-modal {
    width: 100vw;
    max-width: 100vw;
    max-height: 100vh;
    height: 100vh;
    border-radius: 0;
    margin: 0;
    border: none;
  }

  .paper-modal::backdrop {
    background: rgba(0, 0, 0, 0.6);
  }

  .modal-head {
    padding: 14px 16px;
    position: sticky;
    top: 0;
    background: var(--surface);
    z-index: 2;
  }

  .modal-head h2 {
    font-size: 14px;
  }

  .modal-close-x {
    font-size: 24px;
    padding: 4px 8px;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .paper-form {
    padding: 14px 16px;
    max-height: none;
    gap: 12px;
  }

  /* Stack link fields vertically on mobile */
  .field-row {
    flex-direction: column;
    gap: 10px;
  }

  .field-narrow {
    flex: 1;
  }

  .field input,
  .field textarea {
    font-size: 16px; /* prevents iOS zoom on focus */
    padding: 10px 12px;
    min-height: 44px;
  }

  .field-label {
    font-size: 11px;
  }

  .mono-textarea {
    font-size: 13px;
  }

  .modal-foot {
    padding: 12px 16px;
    position: sticky;
    bottom: 0;
    background: var(--surface);
    z-index: 2;
    border-top: 1px solid var(--border);
  }

  .modal-foot .btn {
    min-height: 44px;
    font-size: 13px;
    padding: 10px 16px;
  }

  /* --- JSON import modal mobile --- */
  .json-import-modal {
    width: 100vw;
    max-width: 100vw;
  }

  .json-import-body {
    padding: 14px 16px;
    max-height: none;
    gap: 14px;
  }

  .json-import-instructions {
    padding: 12px 14px;
  }

  .instruction-header {
    font-size: 12px;
  }

  .instruction-detail {
    font-size: 11.5px;
  }

  .json-import-textarea {
    font-size: 12px;
    padding: 12px 14px;
    min-height: 160px;
    font-size: 16px; /* prevents iOS zoom */
  }

  .json-action-btn {
    min-height: 36px;
    padding: 6px 10px;
    font-size: 11px;
  }

  .json-preview-content .preview-title {
    font-size: 13px;
  }

  .json-preview-content .preview-tags {
    gap: 4px;
  }

  /* --- Toast on mobile --- */
  .json-import-toast {
    left: 14px;
    right: 14px;
    bottom: 16px;
    font-size: 12px;
    padding: 12px 16px;
  }

  /* --- Empty state --- */
  .empty-state {
    padding: 40px 16px;
  }

  .empty-state button {
    min-height: 44px;
    font-size: 13px;
    padding: 10px 20px;
  }

  /* --- Footer --- */
  .site-footer {
    padding: 16px 0 30px;
  }

  .site-footer p {
    font-size: 11.5px;
    text-align: center;
  }
}

/* ---------- responsive: small mobile (≤380px) ---------- */

@media (max-width: 380px) {
  .header-actions {
    grid-template-columns: 1fr;
  }

  .site-header h1 {
    font-size: 18px;
  }

  .card-title {
    font-size: 13px;
  }

  .paper-card {
    padding: 12px 12px;
  }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}