*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ─── Theme variables ──────────────────────────────────────────── */
:root {
  --bg: #0d1017;
  --surface: #151a23;
  --surface-alt: #1c2230;
  --border: #2a3042;
  --text: #e2e5ed;
  --text-dim: #7e8499;
  --accent: #5b8def;
  --accent-hover: #7aa5ff;
  --accent-bg: rgba(91, 141, 239, 0.08);
  --green: #34d399;
  --green-bg: rgba(52, 211, 153, 0.08);
  --green-border: rgba(52, 211, 153, 0.22);
  --yellow: #fbbf24;
  --yellow-bg: rgba(251, 191, 36, 0.08);
  --yellow-border: rgba(251, 191, 36, 0.22);
  --red: #f87171;
  --red-bg: rgba(248, 113, 113, 0.08);
  --red-border: rgba(248, 113, 113, 0.22);
  --gray-bg: rgba(126, 132, 153, 0.08);
  --gray-border: rgba(126, 132, 153, 0.22);
  --purple: #a78bfa;
  --purple-bg: rgba(167, 139, 250, 0.08);
  --purple-border: rgba(167, 139, 250, 0.22);
  --teal: #2dd4bf;
  --teal-bg: rgba(45, 212, 191, 0.08);
  --teal-border: rgba(45, 212, 191, 0.22);
  --glass-bg: rgba(21, 26, 35, 0.78);
  --glass-border: rgba(91, 141, 239, 0.12);
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 2px 12px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.4);
  color-scheme: dark;
}

[data-theme="light"] {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-alt: #f0f1f4;
  --border: #dde0e6;
  --text: #1a1d27;
  --text-dim: #6b7084;
  --accent: #3b6fe0;
  --accent-hover: #2d5bc7;
  --accent-bg: rgba(59, 111, 224, 0.06);
  --green: #16a34a;
  --green-bg: rgba(22, 163, 74, 0.06);
  --green-border: rgba(22, 163, 74, 0.2);
  --yellow: #ca8a04;
  --yellow-bg: rgba(202, 138, 4, 0.06);
  --yellow-border: rgba(202, 138, 4, 0.2);
  --red: #dc2626;
  --red-bg: rgba(220, 38, 38, 0.06);
  --red-border: rgba(220, 38, 38, 0.2);
  --gray-bg: rgba(107, 112, 132, 0.06);
  --gray-border: rgba(107, 112, 132, 0.2);
  --purple: #7c3aed;
  --purple-bg: rgba(124, 58, 237, 0.06);
  --purple-border: rgba(124, 58, 237, 0.2);
  --teal: #0d9488;
  --teal-bg: rgba(13, 148, 136, 0.06);
  --teal-border: rgba(13, 148, 136, 0.2);
  --glass-bg: rgba(255, 255, 255, 0.82);
  --glass-border: rgba(59, 111, 224, 0.12);
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.1);
  color-scheme: light;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ─── Layout ───────────────────────────────────────────────────── */
.page-wrap {
  max-width: 1800px;
  margin: 0 auto;
  padding: 2rem 2.5rem;
  padding-bottom: 5rem;
}

.main-columns {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.main-columns.two-col {
  grid-template-columns: 1fr 480px;
}

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

.col-preview {
  display: none;
}

.col-preview.visible {
  display: block;
}

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code {
  background: var(--surface-alt);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.88em;
}

/* ─── Hero ─────────────────────────────────────────────────────── */
.hero {
  margin-bottom: 2rem;
}

.hero-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-top-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.github-star-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
  white-space: nowrap;
}

.github-star-btn:hover {
  border-color: var(--accent);
  background: var(--surface-alt);
  text-decoration: none;
}

.github-star-btn svg {
  flex-shrink: 0;
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-dim);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

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

.theme-toggle .icon-sun,
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }
:root:not([data-theme]) .theme-toggle .icon-sun { display: block; }

.hero-tagline {
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}

.hero-lead {
  color: var(--text-dim);
  font-size: 1.05rem;
  line-height: 1.7;
  max-width: 720px;
  margin-top: 0.5rem;
}

.hero-lead strong {
  color: var(--red);
  font-weight: 600;
}

/* ─── Input tabs ───────────────────────────────────────────────── */
.input-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 0;
  border-bottom: 2px solid var(--border);
}

.input-tab {
  padding: 0.6rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color 0.15s, border-color 0.15s;
}

.input-tab:hover {
  color: var(--text);
}

.input-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* ─── Paste area ───────────────────────────────────────────────── */
.bib-textarea {
  width: 100%;
  min-height: 220px;
  margin-top: 1rem;
  padding: 1rem;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.85rem;
  line-height: 1.55;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  resize: vertical;
}

.bib-textarea::placeholder {
  color: var(--text-dim);
  opacity: 0.6;
}

.bib-textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.btn-verify-paste {
  display: block;
  margin-top: 0.75rem;
  padding: 0.6rem 1.5rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-verify-paste:hover {
  background: var(--accent-hover);
}

/* ─── Upload area ──────────────────────────────────────────────── */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  background: var(--surface);
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-bg);
}

.upload-zone p {
  color: var(--text-dim);
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

.upload-zone .icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  display: block;
}

.upload-zone .label {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text);
}

.upload-zone input[type="file"] {
  display: none;
}

/* ─── In-bar progress ──────────────────────────────────────────── */
.bar-progress {
  display: none;
  flex: 1;
  min-width: 180px;
  max-width: 420px;
  flex-direction: column;
  gap: 0.3rem;
  transition: opacity 0.3s, max-width 0.4s;
}

.bar-progress.active {
  display: flex;
}

.bar-progress.fade-out {
  opacity: 0;
  max-width: 0;
  min-width: 0;
  overflow: hidden;
}

.bar-progress-track {
  background: var(--surface-alt);
  border-radius: 999px;
  height: 6px;
  overflow: hidden;
}

.bar-progress-fill {
  background: var(--accent);
  height: 100%;
  width: 0%;
  border-radius: 999px;
  transition: width 0.3s ease, background 0.3s;
}

.bar-progress-fill.done {
  background: var(--green);
}

.bar-progress-text {
  font-size: 0.75rem;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ─── Results ──────────────────────────────────────────────────── */
.results-section {
  display: none;
  margin-top: 2rem;
}

.summary-bar {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.summary-badge {
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: opacity 0.2s;
}

.summary-badge.active { opacity: 1; }
.summary-badge:not(.active) { opacity: 0.45; }

.badge-verified { background: var(--teal-bg); color: var(--teal); border-color: var(--teal-border); }
.badge-updated { background: var(--yellow-bg); color: var(--yellow); border-color: var(--yellow-border); }
.badge-review { background: var(--red-bg); color: var(--red); border-color: var(--red-border); }
.badge-notfound { background: var(--gray-bg); color: var(--text-dim); border-color: var(--gray-border); }
.badge-duplicates { background: var(--purple-bg); color: var(--purple); border-color: var(--purple-border); }

.entry-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.entry-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  padding-bottom: 1.5rem;
}

.entry-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.entry-header-text {
  min-width: 0;
  flex: 1;
}

.entry-header-aside {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  flex-shrink: 0;
}

.entry-title {
  font-weight: 600;
  font-size: 0.95rem;
}

.entry-meta {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.25rem;
}

/* ── Search links – integrated bottom-right corner tab ── */
.search-links {
  position: absolute;
  bottom: 0;
  right: 0;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0.3rem 0.45rem;
  background: var(--surface-alt);
  border-top: 1px solid var(--border);
  border-left: 1px solid var(--border);
  border-bottom-right-radius: var(--radius);
  border-top-left-radius: var(--radius-sm);
}

[data-theme="light"] .search-links {
  background: #e8eaef;
}

[data-theme="dark"] .search-links,
:root:not([data-theme]) .search-links {
  background: #232938;
}

.search-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 4px;
  text-decoration: none;
  transition: background 0.15s, opacity 0.15s;
  opacity: 0.6;
}

.search-link img {
  display: block;
  width: 16px;
  height: 16px;
  border-radius: 2px;
}

.search-link:hover {
  background: var(--accent-bg);
  opacity: 1;
  text-decoration: none;
}

.entry-card:hover .search-link {
  opacity: 0.85;
}

.entry-meta {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.25rem;
}

.status-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  white-space: nowrap;
  flex-shrink: 0;
}

.tag-verified { background: var(--teal-bg); color: var(--teal); }
.tag-updated { background: var(--yellow-bg); color: var(--yellow); }
.tag-needs_review { background: var(--red-bg); color: var(--red); }
.tag-not_found { background: var(--gray-bg); color: var(--text-dim); }
.tag-duplicate { background: var(--purple-bg); color: var(--purple); }

.entry-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.4rem;
  flex-shrink: 0;
}

.duplicate-row {
  margin-top: 0.5rem;
  font-size: 0.82rem;
  color: var(--purple);
}

.duplicate-row strong { color: var(--text); }

/* ─── Diff table ───────────────────────────────────────────────── */
.diff-table {
  width: 100%;
  margin-top: 0.75rem;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.diff-table th {
  text-align: center;
  color: var(--text-dim);
  font-weight: 500;
  padding: 0.35rem 0.5rem;
  border-bottom: none;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.diff-table th:first-child {
  text-align: left;
}

.diff-table td {
  padding: 0.4rem 0.35rem;
  border-bottom: none;
  vertical-align: middle;
}

.diff-table .field-name {
  font-weight: 600;
  white-space: nowrap;
  width: 80px;
}

.diff-table .field-name-pill {
  display: inline-block;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: var(--accent-bg);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* ── Original & Suggested value columns ── */
.diff-table .val-original {
  color: var(--text);
  opacity: 0.7;
  word-break: break-word;
  max-width: 250px;
  font-size: 0.8rem;
  transition: opacity 0.2s, text-decoration 0.2s;
}

.diff-table .val-original .empty-val {
  color: var(--text-dim);
  font-style: italic;
}

.diff-table .val-suggested {
  color: var(--green);
  word-break: break-word;
  max-width: 250px;
  transition: opacity 0.2s;
}

.diff-table .val-choices {
  word-break: break-word;
}

.diff-table .score-val { color: var(--text-dim); text-align: right; white-space: nowrap; }

/* ── Value columns for pills ── */
.val-col {
  vertical-align: middle;
  padding: 0.3rem 0.35rem;
  border-bottom: none;
  text-align: center;
}

.val-col-original {
  width: 42%;
}

.val-col-suggested {
  width: 42%;
}

.val-col .empty-val {
  color: var(--text-dim);
  font-style: italic;
  font-size: 0.8rem;
  opacity: 0.5;
}

/* ── Choice pills (original & suggested as clickable values) ── */
.choice-pills {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  align-items: flex-start;
}

.choice-pill {
  display: inline-block;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  line-height: 1.45;
  cursor: pointer;
  border: 1.5px solid var(--border);
  background: var(--surface-alt);
  color: var(--text);
  transition: all 0.15s;
  word-break: break-word;
  max-width: 100%;
  outline: none;
  min-height: 1.4em;
}

.choice-pill:hover {
  border-color: var(--text-dim);
  color: var(--text);
}

.choice-pill.pill-original.active {
  background: var(--yellow-bg);
  border-color: var(--yellow-border);
  color: var(--text);
  font-weight: 500;
}

.choice-pill.pill-suggested.active {
  background: var(--green-bg);
  border-color: var(--green-border);
  color: var(--green);
  font-weight: 500;
}

.choice-pill.pill-suggested:not(.active) {
  opacity: 0.6;
}

.choice-pill.pill-original:not(.active) {
  opacity: 0.6;
}

.choice-pill.pill-suggested[contenteditable="true"]:focus {
  border-color: var(--accent);
  background: var(--surface);
  color: var(--text);
  opacity: 1;
  box-shadow: 0 0 0 2px var(--accent-bg);
}

.choice-pill.removed {
  opacity: 0.2;
  text-decoration: line-through;
  pointer-events: none;
}

/* ── Plain field value pill ── */
.choice-pill.pill-value {
  color: var(--text);
  border-color: var(--border);
  background: var(--surface-alt);
}

.choice-pill.pill-value.active {
  border-color: var(--border);
  background: var(--surface-alt);
  color: var(--text);
  font-weight: 400;
}

.choice-pill.pill-value[contenteditable="true"]:focus {
  border-color: var(--accent);
  background: var(--surface);
  box-shadow: 0 0 0 2px var(--accent-bg);
}

/* ── Mini × button ── */
.field-actions-mini {
  white-space: nowrap;
  text-align: right;
  width: 28px;
  vertical-align: middle;
}

.fa-btn-x {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  padding: 0;
  opacity: 0.4;
  transition: all 0.12s;
  vertical-align: middle;
}

.fa-btn-x:hover {
  opacity: 1;
  background: var(--red-bg);
  color: var(--red);
}

.fa-btn-x.active {
  opacity: 1;
  background: var(--red-bg);
  color: var(--red);
}

.diff-row {
  transition: background 0.2s, border-color 0.2s;
  border-left: 3px solid transparent;
}

/* Row states: subtle left border only */
.diff-row[data-action="found"] {
  background: transparent;
  border-left-color: var(--green);
}

.diff-row[data-action="original"] {
  background: transparent;
  border-left-color: transparent;
}

.diff-row[data-action="custom"] {
  background: transparent;
  border-left-color: var(--accent);
}

.diff-row[data-action="remove"] {
  background: transparent;
  border-left-color: var(--red);
}

@keyframes row-flash {
  0%   { filter: brightness(1.4); }
  100% { filter: brightness(1); }
}
.diff-row.flash { animation: row-flash 0.3s ease-out; }
.diff-row.author-match-hidden { display: none; }

.fields-toggle-wrap { margin-top: 0.5rem; }
.fields-toggle-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.8rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0;
  transition: color 0.15s;
}
.fields-toggle-btn:hover { color: var(--text); }
.fields-chevron { transition: transform 0.2s; }
.fields-toggle-wrap.collapsed .fields-chevron { transform: rotate(-90deg); }
.fields-toggle-wrap.collapsed .fields-table { display: none; }
.fields-table .current-val { color: var(--text); }
.field-row-plain .found-text { color: var(--text); }

.found-text {
  display: block;
  padding: 0.15rem 0.3rem;
  border-radius: 3px;
  border: 1px solid transparent;
  outline: none;
  min-height: 1.3em;
  transition: border-color 0.15s, background 0.15s;
  word-break: break-word;
}

.found-text[contenteditable="true"]:hover {
  border-color: var(--border);
  background: var(--surface-alt);
}

.found-text[contenteditable="true"]:focus {
  border-color: var(--accent);
  background: var(--surface-alt);
}

/* Editable suggestion text */
.found-text.removed {
  opacity: 0.3;
  text-decoration: line-through;
  pointer-events: none;
}

.field-actions {
  white-space: nowrap;
  text-align: right;
  width: 60px;
}

.fa-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  padding: 0;
  margin-left: 2px;
  transition: all 0.12s;
  vertical-align: middle;
}

.fa-btn:hover {
  background: var(--surface-alt);
  color: var(--text);
  border-color: var(--text-dim);
}

.fa-btn.fa-use-found.active { background: var(--green-bg); border-color: var(--green); color: var(--green); }
.fa-btn.fa-revert.active { background: var(--yellow-bg); border-color: var(--yellow); color: var(--yellow); }
.fa-btn.fa-remove.active { background: var(--red-bg); border-color: var(--red); color: var(--red); }

/* ─── Entry actions (segmented toggle) ─────────────────────────── */
.entry-actions {
  display: flex;
  gap: 0;
  margin-top: 0.6rem;
}
.entry-actions .seg-btn {
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text-dim);
  font-size: 0.78rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.entry-actions .seg-btn:first-child { border-radius: var(--radius-sm) 0 0 var(--radius-sm); }
.entry-actions .seg-btn:last-child { border-radius: 0 var(--radius-sm) var(--radius-sm) 0; border-left: none; }
.entry-actions .seg-btn:only-child { border-radius: var(--radius-sm); border-left: 1px solid var(--border); }

.entry-actions .seg-btn:hover { color: var(--text); border-color: var(--text-dim); }
.entry-actions .seg-btn.active-accept {
  background: var(--green-bg); border-color: var(--green-border); color: var(--green); font-weight: 500;
}
.entry-actions .seg-btn.active-revert {
  background: var(--yellow-bg); border-color: var(--yellow-border); color: var(--yellow); font-weight: 500;
}

.review-hint {
  margin-top: 0.65rem;
  padding: 0.65rem 0.75rem;
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--text-dim);
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.review-hint strong { color: var(--text); }
.review-hint .review-hint-match { color: var(--accent); word-break: break-word; }

.not-found-hint {
  margin-top: 0.65rem;
  padding: 0.65rem 0.75rem;
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--text-dim);
  background: var(--gray-bg);
  border: 1px solid var(--gray-border);
  border-radius: var(--radius-sm);
}

.btn {
  padding: 0.4rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-alt);
  color: var(--text);
  font-size: 0.82rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover { background: var(--border); }

/* ─── BibTeX preview panel ─────────────────────────────────────── */
.preview-panel {
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface-alt);
  flex-shrink: 0;
}

.preview-header h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.preview-header h3 svg { color: var(--accent); }

.preview-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.btn-copy {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-dim);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-copy:hover { border-color: var(--accent); color: var(--accent); }
.btn-copy.copied { border-color: var(--green); color: var(--green); }

.btn-autoscroll {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.3rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.15s;
}

.btn-autoscroll:hover { border-color: var(--accent); color: var(--accent); }
.btn-autoscroll.active { border-color: var(--accent); color: var(--accent); background: var(--accent-bg); }

.preview-body {
  flex: 1;
  overflow-y: auto;
  padding: 0;
}

.preview-code {
  display: block;
  padding: 0;
  margin: 0;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--text);
  white-space: pre;
  background: transparent;
  counter-reset: diff-line;
}

.diff-line {
  display: block;
  padding: 0 0.75rem 0 0.5rem;
  min-height: 1.5em;
  white-space: pre-wrap;
  word-break: break-all;
}

.diff-line::before {
  display: inline-block;
  width: 1.6em;
  margin-right: 0.6em;
  text-align: right;
  color: var(--text-dim);
  opacity: 0.5;
  user-select: none;
  font-size: 0.7rem;
}

.diff-line.diff-add {
  background: var(--green-bg);
  border-left: 3px solid var(--green);
}
.diff-line.diff-add::before {
  content: "+";
  color: var(--green);
  opacity: 0.8;
}

.diff-line.diff-del {
  background: var(--red-bg);
  border-left: 3px solid var(--red);
  text-decoration: line-through;
  opacity: 0.7;
}
.diff-line.diff-del::before {
  content: "−";
  color: var(--red);
  opacity: 0.8;
}

.diff-line.diff-ctx {
  border-left: 3px solid transparent;
}
.diff-line.diff-ctx::before {
  content: " ";
}

.diff-sep {
  display: block;
  padding: 0.15rem 0.75rem;
  font-size: 0.7rem;
  color: var(--accent);
  background: var(--accent-bg);
  border-left: 3px solid var(--accent);
  user-select: none;
  opacity: 0.7;
}

@keyframes highlight-pulse {
  0%   { background: var(--yellow-bg); box-shadow: inset 0 0 0 1px var(--yellow-border); }
  100% { background: transparent; box-shadow: none; }
}

.diff-line.highlight-flash {
  animation: highlight-pulse 1.5s ease-out;
}

.preview-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 200px;
  color: var(--text-dim);
  font-size: 0.85rem;
  font-style: italic;
}

/* ─── Floating toolbar ─────────────────────────────────────────── */
.floating-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 900;
  padding: 0 1rem 1rem;
  pointer-events: none;
}

.floating-bar.visible {
  display: flex;
  justify-content: center;
  animation: floatIn 0.25s ease-out;
}

@keyframes floatIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.floating-bar-inner {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 1.25rem;
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
}

.download-bar { display: none; }

/* ─── Settings popover ─────────────────────────────────────────── */
.settings-anchor {
  position: relative;
}

.settings-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s, transform 0.3s;
}

[data-theme="light"] .settings-btn {
  background: rgba(0, 0, 0, 0.03);
}

.settings-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.settings-btn.active {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-bg);
  transform: rotate(60deg);
}

.settings-popover {
  display: none;
  position: absolute;
  bottom: calc(100% + 12px);
  right: -0.5rem;
  min-width: 280px;
  padding: 0.75rem 0.85rem;
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  text-align: left;
}

.settings-popover.open {
  display: block;
  animation: popoverIn 0.15s ease-out;
}

@keyframes popoverIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.popover-arrow {
  position: absolute;
  bottom: -6px;
  right: 14px;
  width: 12px;
  height: 12px;
  background: var(--glass-bg);
  border-right: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  transform: rotate(45deg);
}

.settings-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 0;
}

.setting-icon {
  flex-shrink: 0;
  color: var(--text-dim);
  opacity: 0.7;
}

.settings-divider {
  height: 1px;
  background: var(--border);
  margin: 0.35rem 0;
}

.sub-option {
  display: none;
  margin: 0 0 0.2rem 2rem;
  padding: 0.3rem 0.6rem;
  background: var(--surface-alt);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--text-dim);
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.sub-option.visible { display: flex; }

.sub-label { font-weight: 500; margin-right: 0.15rem; }

.radio-label {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  cursor: pointer;
  font-size: 0.8rem;
}

.radio-label input[type="radio"] { accent-color: var(--accent); }

.option-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
}

.option-toggle input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 1.1rem;
  height: 1.1rem;
  border: 1.5px solid var(--border);
  border-radius: 3px;
  background: var(--surface);
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  transition: border-color 0.15s, background 0.15s;
}

.option-toggle input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}

.option-toggle input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 0.5px;
  width: 5px;
  height: 9px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.option-toggle:hover input[type="checkbox"] { border-color: var(--accent); }
.option-toggle span { line-height: 1; }

.option-select {
  padding: 0.2rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 0.82rem;
  cursor: pointer;
  outline: none;
  margin-left: 0.25rem;
  transition: border-color 0.15s;
}

.option-select:hover,
.option-select:focus {
  border-color: var(--accent);
}

.btn-download {
  padding: 0.65rem 2rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, opacity 0.3s, transform 0.3s;
  white-space: nowrap;
}

.btn-download:hover { background: var(--accent-hover); }

.btn-download.hidden {
  display: none;
}

.btn-download.fade-in {
  animation: btnAppear 0.35s ease-out;
}

@keyframes btnAppear {
  from { opacity: 0; transform: scale(0.9); }
  to   { opacity: 1; transform: scale(1); }
}

.entry-card.hidden { display: none; }

.btn-jump-preview {
  display: inline-flex;
  align-items: center;
  gap: -2px;
  padding: 0.25rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-alt);
  color: var(--text-dim);
  cursor: pointer;
  opacity: 0.75;
  flex-shrink: 0;
  transition: opacity 0.15s, border-color 0.15s, color 0.15s, background 0.15s;
  font-size: 0;
  line-height: 1;
}

.btn-jump-preview svg:last-child { margin-left: -5px; }

.btn-jump-preview:hover {
  opacity: 1;
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-bg);
}

/* ─── How it works ─────────────────────────────────────────────── */
.how-it-works {
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

.step h3 { font-size: 1rem; font-weight: 600; margin-bottom: 0.4rem; }
.step p { font-size: 0.88rem; color: var(--text-dim); line-height: 1.55; }

.c-green { color: var(--teal); }
.c-yellow { color: var(--yellow); }
.c-red { color: var(--red); }

/* ─── Features ─────────────────────────────────────────────────── */
.features {
  margin-top: 3rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.feature-icon { font-size: 1.5rem; margin-bottom: 0.5rem; }
.feature-card h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.35rem; }
.feature-card p { font-size: 0.85rem; color: var(--text-dim); line-height: 1.5; }

/* ─── FAQ ──────────────────────────────────────────────────────── */
.faq {
  margin-top: 3rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.faq details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.5rem;
}

.faq summary {
  padding: 0.85rem 1.25rem;
  font-weight: 600;
  font-size: 0.93rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq summary::after {
  content: "+";
  font-size: 1.1rem;
  color: var(--text-dim);
  flex-shrink: 0;
  margin-left: 1rem;
  transition: transform 0.2s;
}

.faq details[open] summary::after { content: "-"; }

.faq details p {
  padding: 0 1.25rem 1rem;
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.6;
}

/* ─── Footer ───────────────────────────────────────────────────── */
.site-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-dim);
  padding-bottom: 2rem;
}

/* ─── Responsive ───────────────────────────────────────────────── */
@media (max-width: 1200px) {
  .main-columns.two-col {
    grid-template-columns: 1fr;
  }
  .col-preview.visible {
    position: fixed;
    bottom: 4.5rem;
    right: 1rem;
    width: 420px;
    max-height: 50vh;
    z-index: 800;
    box-shadow: var(--shadow-lg);
  }
  .col-preview.visible .preview-panel {
    max-height: 50vh;
  }
}

@media (max-width: 640px) {
  .page-wrap { padding: 1rem; }
  .summary-bar { gap: 0.5rem; }
  .summary-badge { font-size: 0.78rem; padding: 0.4rem 0.75rem; }
  .steps { grid-template-columns: 1fr 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .col-preview.visible {
    width: calc(100% - 2rem);
    left: 1rem;
    right: 1rem;
  }
}