:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --ink: #1b1f24;
  --muted: #5b6672;
  --line: #d8dee6;
  --accent: #1f6f4a;
  --accent-ink: #ffffff;
  --warn-bg: #fff6e5;
  --warn-line: #e0b457;
  --error: #a4251f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0 16px 48px;
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

header,
.panel,
footer {
  max-width: 1100px;
  margin: 0 auto;
}

header {
  padding: 32px 0 8px;
}

h1 {
  margin: 0 0 4px;
  font-size: 1.6rem;
}

.tagline {
  margin: 0;
  color: var(--muted);
  max-width: 70ch;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px 22px;
  margin-top: 18px;
}

.panel h2 {
  margin: 0 0 14px;
  font-size: 1.15rem;
}

.hidden {
  display: none;
}

/* ---------------------------------------------------------------- loading */

.loaders {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.loader label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
}

.loader.example {
  grid-column: 1 / -1;
}

.loader.example .row {
  align-items: center;
  gap: 14px;
}

.loader.example .hint {
  margin: 0;
}

.loader.example button {
  flex: none;
  white-space: nowrap;
}

.row {
  display: flex;
  gap: 8px;
}

input[type="text"],
input[type="number"] {
  flex: 1;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font: inherit;
  background: #fff;
  color: var(--ink);
}

.hint {
  color: var(--muted);
  font-size: 0.86rem;
  margin: 6px 0 0;
}

.status {
  margin: 14px 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.status.error,
.error {
  color: var(--error);
}

.error {
  min-height: 1.2em;
  margin: 8px 0 0;
  font-size: 0.9rem;
}

/* --------------------------------------------------------------- findings */

#findings table {
  border-collapse: collapse;
  width: 100%;
  max-width: 760px;
}

#findings th,
#findings td {
  text-align: left;
  padding: 5px 10px 5px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

#findings th {
  width: 190px;
  font-weight: 600;
  color: var(--muted);
}

.warn {
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  border-radius: 6px;
  padding: 10px 12px;
  font-size: 0.9rem;
  margin: 12px 0 0;
}

/* -------------------------------------------------------------- questions */

.split {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(340px, 1fr);
  gap: 24px;
  align-items: start;
}

#viewer {
  position: relative;
  width: 100%;
  height: 420px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  overflow: hidden;
}

.progress {
  height: 5px;
  background: var(--line);
  border-radius: 3px;
  overflow: hidden;
}

#progress-bar {
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 0.2s ease;
}

.question-side h3 {
  margin: 14px 0 6px;
  font-size: 1.12rem;
}

.why {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.92rem;
}

.evidence {
  margin: 0 0 14px;
  padding-left: 18px;
  font-size: 0.88rem;
  color: var(--muted);
}

.choice {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 7px;
  margin-bottom: 7px;
  cursor: pointer;
  background: #fff;
}

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

.choice span {
  display: flex;
  flex-direction: column;
}

.choice em {
  font-style: normal;
  color: var(--muted);
  font-size: 0.86rem;
}

.controls {
  display: flex;
  gap: 10px;
  margin-top: 16px;
  flex-wrap: wrap;
}

button {
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  cursor: pointer;
}

button:hover:not(:disabled) {
  border-color: var(--accent);
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

a.button {
  display: inline-block;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  text-decoration: none;
  color: var(--ink);
}

a.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

details summary {
  cursor: pointer;
  margin: 12px 0;
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.blocking-note {
  margin: 10px 0 0;
  font-size: 0.86rem;
  color: var(--error);
  display: none;
}

.blocking-note.visible {
  display: block;
}

/* ----------------------------------------------------------------- result */

pre {
  background: #11161c;
  color: #e8edf3;
  padding: 14px 16px;
  border-radius: 8px;
  overflow-x: auto;
  font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre;
  max-height: 460px;
}

footer {
  margin-top: 26px;
  color: var(--muted);
  font-size: 0.85rem;
}

code {
  background: #eceff3;
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.9em;
}

footer code {
  background: #e3e7ec;
}

@media (max-width: 860px) {
  .loaders,
  .split {
    grid-template-columns: 1fr;
  }

  .loader.example .row {
    flex-direction: column;
    align-items: flex-start;
  }

  #viewer {
    height: 320px;
  }
}

/* ------------------------------------------------- reserved residue names */

/* The refusal the page shows for a ligand whose residue name an Amber force
   field already defines, with the rename offered as an action. */
.muted {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 10px 0 0;
}

#rename-apply {
  margin-top: 14px;
}