:root {
  --bg: #f6f7fb;
  --bg-elev: #ffffff;
  --fg: #0f172a;
  --fg-soft: #334155;
  --muted: #64748b;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --accent: #4f46e5;
  --accent-2: #7c3aed;
  --accent-soft: #eef2ff;
  --row-hover: #f1f5f9;
  --row-active: #e0e7ff;

  --aa-hydrophobic: #f0f9ff;
  --aa-polar: #f0fdf4;
  --aa-acidic: #fef2f2;
  --aa-basic: #eff6ff;
  --aa-special: #fefce8;
  --aa-uncovered-fg: #cbd5e1;
  /* Coverage uses a warm cream→red gradient (see depthColor in main.js).
     Cleavage markers must contrast with that, so use the indigo accent. */
  --cleave: #4f46e5;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow: 0 6px 16px rgba(15, 23, 42, 0.07);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.10);
  --gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 55%, #ec4899 100%);

  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
  color: var(--fg);
  background: var(--bg);
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- Topbar ---------- */
.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 22px;
  position: sticky;
  top: 0;
  background: var(--gradient);
  color: white;
  z-index: 10;
  box-shadow: var(--shadow);
}
.topbar h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 10px;
}
.topbar h1::before {
  content: "";
  display: inline-block;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 30% 30%, rgba(255,255,255,0.95), rgba(255,255,255,0.55) 35%, rgba(255,255,255,0) 70%),
    conic-gradient(from 200deg, #fcd34d, #f472b6, #60a5fa, #34d399, #fcd34d);
  box-shadow: 0 0 0 2px rgba(255,255,255,0.18), inset 0 0 6px rgba(0,0,0,0.25);
}
.status {
  color: rgba(255, 255, 255, 0.88);
  font-size: 13px;
  flex: 1;
  font-variant-numeric: tabular-nums;
}

/* ---------- Loader ---------- */
.loader {
  margin: 36px auto;
  max-width: 760px;
  padding: 28px 28px 24px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-elev);
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--shadow-lg);
}
.loader-hero { margin-bottom: 4px; }
.loader-hero h2 {
  margin: 0 0 4px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.015em;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.loader-hero p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}
.loader-hero code {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12px;
  font-family: var(--mono);
}
.loader-row { display: flex; gap: 10px; align-items: end; flex-wrap: wrap; }
.loader-field { display: flex; flex-direction: column; gap: 5px; font-size: 11px; color: var(--muted); flex: 0 0 auto; }
.loader-field.grow { flex: 1 1 240px; }
.loader-field span { text-transform: uppercase; letter-spacing: 0.5px; font-weight: 600; }
.loader-field input,
.loader-field textarea {
  font-family: var(--mono);
  font-size: 13px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: white;
  color: var(--fg);
  min-width: 240px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.loader-field input:focus,
.loader-field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}
.loader-field textarea {
  font-size: 12px;
  resize: vertical;
  width: 100%;
  line-height: 1.5;
}
.loader-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin: 4px 0;
}
.loader-divider::before,
.loader-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}
.loader-error { color: #b91c1c; font-size: 13px; font-weight: 500; }
.loader-hint {
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.loader-samples {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.sample-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 8px;
}
.sample-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elev);
  cursor: pointer;
  font-family: inherit;
  text-align: left;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s, transform 0.08s;
  box-shadow: var(--shadow-sm);
}
.sample-card:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}
.sample-card:active { transform: translateY(0); }
.sample-card-top {
  display: flex;
  align-items: baseline;
  gap: 8px;
  width: 100%;
}
.sample-card .acc {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 12px;
  color: var(--accent);
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--accent-soft);
  letter-spacing: 0.02em;
}
.sample-card:hover .acc { background: white; }
.sample-card .name {
  font-size: 13px;
  font-weight: 600;
  color: var(--fg);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.sample-card .desc {
  font-size: 11px;
  color: var(--muted);
  line-height: 1.4;
}

/* ---------- Buttons ---------- */
.btn {
  border: 1px solid var(--border);
  background: white;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  color: var(--fg-soft);
  font-weight: 500;
  transition: border-color 0.15s, color 0.15s, background 0.15s, box-shadow 0.15s, transform 0.05s;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: var(--gradient);
  color: white;
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
  font-weight: 600;
}
.btn.primary:hover { filter: brightness(1.06); color: white; box-shadow: 0 6px 18px rgba(79, 70, 229, 0.35); }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }

/* ---------- Layout ---------- */
main#app { padding: 0; }
.detail { padding: 20px 24px 60px; max-width: 1200px; margin: 0 auto; }

/* ---------- Header card ---------- */
.header-card {
  margin-bottom: 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.header-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--gradient);
}
.header-card h2 {
  margin: 0 0 4px;
  font-size: 19px;
  font-family: var(--mono);
  font-weight: 700;
  letter-spacing: -0.01em;
}
.header-card .pname { font-weight: 500; color: var(--fg-soft); font-size: 14px; }
.header-card .desc { color: var(--muted); font-size: 12px; font-style: italic; margin-top: 4px; word-break: break-word; }
.header-card .raw-header {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  background: var(--bg);
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  word-break: break-all;
}
.header-card .metrics { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.metric {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 5px 11px;
  font-size: 12px;
  background: var(--bg-elev);
  transition: border-color 0.15s, background 0.15s;
}
.metric:hover { border-color: var(--border-strong); background: var(--bg); }
.metric .label {
  color: var(--muted);
  display: block;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}
.metric .value { font-weight: 600; font-size: 14px; word-break: break-word; color: var(--fg); }
.header-card-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}
.header-card .mass-line {
  margin-top: 8px;
  font-size: 12px;
  color: var(--muted);
  font-family: var(--mono);
}
.header-card .mass-line .v { color: var(--fg); font-weight: 600; }

/* ---------- Tabs ---------- */
.tabs {
  display: flex;
  gap: 2px;
  margin: 10px 0 0;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}
.tab {
  border: none;
  background: none;
  padding: 10px 16px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  border-bottom: 2px solid transparent;
  font-family: inherit;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
  border-radius: 6px 6px 0 0;
  white-space: nowrap;
}
.tab:hover { color: var(--fg); background: var(--row-hover); }
.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

/* ---------- Sequence tab ---------- */
.sequence-toolbar {
  margin: 14px 0 8px;
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  font-size: 12px;
}
.sequence-toolbar label { display: inline-flex; align-items: center; gap: 6px; }
.sequence-toolbar input[type="search"] {
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 12px;
  min-width: 240px;
  font-family: var(--mono);
  background: var(--bg-elev);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.sequence-toolbar input[type="search"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.sequence-area {
  margin-top: 6px;
  padding: 14px 14px 10px;
  overflow-x: auto;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
}
.seq-group { font-family: var(--mono); font-size: 14px; margin-bottom: 14px; }
.seq-group:last-child { margin-bottom: 0; }
.seq-line {
  display: grid;
  grid-template-columns: 5ch repeat(60, 1ch) 6ch;
  line-height: 1.75em;
  align-items: center;
  width: fit-content;
  margin-inline: auto;
}
.seq-pos {
  text-align: right;
  padding-right: 0.5ch;
  color: var(--muted);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  user-select: none;
}
.seq-pos.end { text-align: left; padding-left: 0.5ch; padding-right: 0; }
.aa { text-align: center; transition: background 0.1s; }
.aa.tick { border-right: 1px dotted var(--border-strong); }
.aa.colored.hydrophobic { background: var(--aa-hydrophobic); }
.aa.colored.polar { background: var(--aa-polar); }
.aa.colored.acidic { background: var(--aa-acidic); color: #991b1b; }
.aa.colored.basic { background: var(--aa-basic); color: #1e40af; }
.aa.colored.special { background: var(--aa-special); }
.aa.match {
  background: #fde68a;
  color: #78350f;
  font-weight: 700;
  border-radius: 3px;
  box-shadow: 0 0 0 1px rgba(180, 83, 9, 0.3);
}

/* ---------- Composition ---------- */
.composition-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
  margin-top: 14px;
}
/* Composition tab has a fixed pair of cards — split the full width evenly
   instead of letting auto-fill leave dead space on the right. */
.composition-grid.cols-2 { grid-template-columns: 1fr 1fr; }
@media (max-width: 720px) {
  .composition-grid.cols-2 { grid-template-columns: 1fr; }
}
.comp-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  background: var(--bg-elev);
  box-shadow: var(--shadow-sm);
}
.comp-card h4 {
  margin: 0 0 10px;
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  font-weight: 600;
}
.comp-bar-row {
  display: grid;
  grid-template-columns: 2.5ch 4ch 1fr 4ch;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  margin-bottom: 4px;
  font-family: var(--mono);
}
.comp-bar-row .aa-label { font-weight: 700; }
.comp-bar-row .pct, .comp-bar-row .count {
  color: var(--muted);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.comp-bar {
  height: 10px;
  background: var(--bg);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.comp-bar > div {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 999px;
  transition: width 0.3s;
}
.comp-bar.hydrophobic > div { background: linear-gradient(90deg, #38bdf8, #2563eb); }
.comp-bar.polar > div { background: linear-gradient(90deg, #34d399, #059669); }
.comp-bar.acidic > div { background: linear-gradient(90deg, #fb7185, #be123c); }
.comp-bar.basic > div { background: linear-gradient(90deg, #818cf8, #4338ca); }
.comp-bar.special > div { background: linear-gradient(90deg, #fbbf24, #b45309); }

/* ---------- Physicochemical properties ---------- */
.pc-card { margin-top: 14px; }
.pc-metrics { display: flex; flex-wrap: wrap; gap: 6px; }
.pc-metrics .metric { min-width: 150px; flex: 1 1 150px; }
.pc-unit { color: var(--muted); font-weight: 500; font-size: 11px; }
.ss-block { margin-top: 14px; }
.ss-title {
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  font-weight: 600;
  margin-bottom: 6px;
}
.ss-bar {
  display: flex;
  height: 14px;
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.ss-seg { height: 100%; transition: width 0.3s; }
.ss-keys {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin-top: 8px;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}
.ss-key { display: inline-flex; align-items: center; gap: 5px; color: var(--muted); }
.ss-swatch { width: 11px; height: 11px; border-radius: 3px; display: inline-block; }
.ss-alpha_helix { background: linear-gradient(90deg, #f87171, #dc2626); }
.ss-beta_sheet  { background: linear-gradient(90deg, #fbbf24, #d97706); }
.ss-beta_turn   { background: linear-gradient(90deg, #34d399, #059669); }
.ss-coil        { background: linear-gradient(90deg, #94a3b8, #64748b); }

/* ---------- Sites (motif scan) ---------- */
.site-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
  padding: 14px 16px;
  margin: 14px 0;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
}
.site-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--fg-soft);
  cursor: pointer;
}
.site-toggle b { color: var(--fg); font-variant-numeric: tabular-nums; }
.site-toggle .legend-square { width: 14px; height: 14px; }
.site-disclaimer { font-size: 12px; color: var(--muted); font-style: italic; margin: 8px 0 12px; }

.aa.site.on { border-radius: 2px; font-weight: 600; }
.aa.site.on.site-glyc { background: #ccfbf1; color: #115e59; }
.aa.site.on.site-phospho { background: #fef9c3; color: #854d0e; }
.aa.site.on.site-lipid { background: #ffedd5; color: #9a3412; }
.aa.site.on.site-other { background: #dbeafe; color: #1e40af; }
.aa.site.on.site-motif { background: #f3e8ff; color: #6b21a8; }
.legend-square.site-glyc { background: #ccfbf1; }
.legend-square.site-phospho { background: #fef9c3; }
.legend-square.site-lipid { background: #ffedd5; }
.legend-square.site-other { background: #dbeafe; }
.legend-square.site-motif { background: #f3e8ff; }

/* ---------- Controls block (Property + Digest) ---------- */
.prop-controls,
.digest-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: end;
  padding: 14px 16px;
  margin: 14px 0;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
}
.prop-controls label,
.digest-controls label {
  display: flex;
  flex-direction: column;
  font-size: 10px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  gap: 4px;
  font-weight: 600;
}
.prop-controls select,
.prop-controls input,
.digest-controls select,
.digest-controls input {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 7px;
  font-size: 13px;
  background: white;
  font-family: inherit;
  text-transform: none;
  color: var(--fg);
  letter-spacing: normal;
  font-weight: 500;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.prop-controls select:focus,
.prop-controls input:focus,
.digest-controls select:focus,
.digest-controls input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}
.prop-controls input[type=number],
.digest-controls input[type=number] { width: 9ch; }
.prop-controls select,
.digest-controls select { min-width: 20ch; }
.prop-hint, .digest-hint {
  align-self: center;
  font-size: 12px;
  color: var(--muted);
  text-transform: none;
  letter-spacing: normal;
  font-weight: normal;
}

.prop-stats,
.digest-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
  font-size: 12px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  margin-bottom: 8px;
}
.prop-stats b, .digest-stats b { color: var(--fg); font-weight: 700; }

.prop-legend {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  margin-bottom: 10px;
}
.prop-legend-bar {
  flex: 0 0 220px;
  height: 12px;
  border-radius: 999px;
  background: linear-gradient(
    to right,
    rgba(37, 99, 235, 0.85),
    rgba(37, 99, 235, 0) 50%,
    rgba(220, 38, 38, 0) 50%,
    rgba(220, 38, 38, 0.85)
  );
  border: 1px solid var(--border);
}
.prop-legend-note { font-style: italic; }
.aa.prop { border-radius: 2px; }
.aa.prop.uncovered { color: var(--muted); opacity: 0.45; }

/* ---------- Spinner / empties ---------- */
.spinner {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  vertical-align: middle;
  margin-left: 6px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.computing { color: var(--muted); font-style: italic; padding: 10px 0; }
.empty { color: var(--muted); font-style: italic; padding: 10px 0; }

/* ---------- Raw tab ---------- */
.raw-json {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  font-family: var(--mono);
  font-size: 12px;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 70vh;
  overflow: auto;
  box-shadow: var(--shadow-sm);
}

/* ---------- Generic legend chips ---------- */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-size: 12px;
  color: var(--muted);
  padding: 10px 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 4px 0 12px;
  align-items: center;
}
.legend-item { display: inline-flex; align-items: center; gap: 6px; }
.legend-square {
  display: inline-block;
  width: 16px; height: 16px;
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 11px;
  text-align: center;
  line-height: 16px;
  border: 1px solid var(--border);
}
.legend-square.hydrophobic { background: var(--aa-hydrophobic); }
.legend-square.polar { background: var(--aa-polar); }
.legend-square.acidic { background: var(--aa-acidic); color: #991b1b; }
.legend-square.basic { background: var(--aa-basic); color: #1e40af; }
.legend-square.special { background: var(--aa-special); }
.legend-square.uncovered { background: white; color: var(--aa-uncovered-fg); }
.legend-square.cleave { background: white; border-right: 2px solid var(--cleave); }

/* ---------- Digest depth legend ---------- */
.depth-legend .legend-item { gap: 8px; }
.depth-label { font-size: 11px; color: var(--muted); }
.depth-chip {
  display: inline-block;
  min-width: 22px;
  padding: 2px 6px;
  text-align: center;
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--fg);
  border: 1px solid rgba(0, 0, 0, 0.06);
  font-variant-numeric: tabular-nums;
}

/* ---------- Digest sequence rendering ---------- */
.digest-error {
  color: #b91c1c;
  font-size: 13px;
  padding: 10px 14px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 8px;
  margin: 6px 0;
}
.digest-error code { background: white; padding: 2px 5px; border-radius: 3px; font-size: 12px; }

.digest-section-title {
  margin: 18px 0 6px;
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  font-weight: 600;
}

.aa.cov { border-radius: 2px; }
.aa.cov.uncovered { color: var(--aa-uncovered-fg); }
.aa.cov.dark { color: white; font-weight: 600; }

/* Cleavage marker: left-border on the residue immediately after the cut. */
.aa.cleave-before { box-shadow: inset 2px 0 0 var(--cleave); }

/* ---------- Digest peptide table ---------- */
.digest-table-wrap {
  margin-top: 8px;
  overflow-x: auto;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
  max-height: 60vh;
}
.digest-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  font-family: var(--mono);
}
.digest-table th, .digest-table td {
  padding: 6px 10px;
  border-bottom: 1px solid var(--border);
  text-align: right;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.digest-table th {
  position: sticky;
  top: 0;
  background: var(--bg);
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
  text-transform: uppercase;
  font-size: 10px;
  letter-spacing: 0.5px;
  z-index: 1;
}
.digest-table th:hover { color: var(--accent); }
.digest-table th.sorted-asc::after { content: " ▲"; font-size: 9px; color: var(--accent); }
.digest-table th.sorted-desc::after { content: " ▼"; font-size: 9px; color: var(--accent); }
.digest-table td.seq, .digest-table th.seq { text-align: left; }
.digest-table tbody tr { transition: background 0.1s; }
.digest-table tbody tr:hover { background: var(--row-hover); }
.digest-table .pep-seq {
  color: var(--fg);
  word-break: break-all;
  white-space: normal;
  max-width: 60ch;
  display: inline-block;
}
.digest-table a.pep-link {
  text-decoration: none;
  border-bottom: 1px dotted var(--border-strong);
  transition: color 0.15s, border-color 0.15s;
}
.digest-table a.pep-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
/* ---------- URL parameter help ---------- */
.url-help {
  margin-top: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elev);
  font-size: 13px;
}
.url-help > summary {
  cursor: pointer;
  padding: 10px 14px;
  font-weight: 600;
  color: var(--fg-soft);
  list-style: revert;
}
.url-help[open] > summary { border-bottom: 1px solid var(--border); }
.url-help-body { padding: 12px 14px; color: var(--fg-soft); line-height: 1.5; }
.url-help-body > p { margin: 0 0 10px; }
.url-help-table { width: 100%; border-collapse: collapse; }
.url-help-table th, .url-help-table td {
  text-align: left;
  padding: 5px 8px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.url-help-table tr:last-child td { border-bottom: none; }
.url-help-table th {
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.url-help-table td:first-child { white-space: nowrap; }
.url-help code {
  font-family: var(--mono);
  font-size: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 1px 5px;
  border-radius: 4px;
  word-break: break-word;
}
.url-help-eg { margin: 10px 0 0; color: var(--muted); }

/* "Load another protein" pill in the topbar. */
.topbar-btn {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.18);
  color: white;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid rgba(255, 255, 255, 0.28);
  cursor: pointer;
  transition: background 0.15s, transform 0.08s;
}
.topbar-btn:hover { background: rgba(255, 255, 255, 0.28); }
.topbar-btn:active { transform: translateY(1px); }