:root {
  color-scheme: light;
  --bg: #f4f5f7;
  --surface: #ffffff;
  --ink: #1c2330;
  --ink-soft: #5c6473;
  --line: #d8dce3;
  --accent: #1d4ed8;
  --success: #146c43;
  --success-soft: #e6f4ec;
  --warning: #8a5b00;
  --warning-soft: #fbf3e0;
  --danger: #a02631;
  --danger-soft: #fbeaec;
  --mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

img, svg { display: block; max-width: 100%; }

h1, h2, h3, p { margin: 0; }
h1 { font-size: 1.35rem; font-weight: 600; }
h2 { font-size: 1rem; font-weight: 600; }
h3 { font-size: 0.85rem; font-weight: 600; color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.06em; }

.app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem 1.25rem 2rem;
}

.app-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 1rem;
}

.app-header-title {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
}

.app-header-title h1 {
  margin: 0;
}

.app-credits {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.app-credits a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-underline-offset: 2px;
}

.app-credits a:hover {
  text-decoration-color: currentColor;
}

.status-line {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.status-line span { color: var(--ink); }

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 440px) minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.sidebar {
  display: grid;
  gap: 1rem;
  position: sticky;
  top: 1rem;
}

.card,
.sidebar > form,
.sidebar > .validation {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
}

.sidebar > form { display: grid; gap: 0.75rem; }

.sidebar label {
  display: grid;
  gap: 0.25rem;
  font-size: 0.85rem;
  font-weight: 600;
}

.sidebar small {
  font-weight: 400;
  color: var(--ink-soft);
}

textarea {
  width: 100%;
  min-height: 80px;
  resize: vertical;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfbfd;
  font: 13px/1.4 var(--mono);
  color: var(--ink);
}

textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}

button {
  padding: 0.55rem 0.8rem;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

button:hover { filter: brightness(1.05); }

.validation h2 { margin-bottom: 0.5rem; }

.messages { display: grid; gap: 0.35rem; }

.message {
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 0.85rem;
  line-height: 1.4;
  background: #f7f8fa;
}

.message--info    { color: var(--ink-soft); }
.message--success { color: var(--success); background: var(--success-soft); border-color: var(--success-soft); }
.message--warning { color: var(--warning); background: var(--warning-soft); border-color: var(--warning-soft); }
.message--error   { color: var(--danger);  background: var(--danger-soft);  border-color: var(--danger-soft);  }

.workspace { display: grid; gap: 1rem; min-width: 0; }

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.summary {
  color: var(--ink-soft);
  margin-bottom: 0.5rem;
}

.verdict {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.5rem;
  border-radius: 999px;
  background: #eef1f6;
  color: var(--ink-soft);
  white-space: nowrap;
}

.verdict[data-state="exact_match"]      { background: var(--success-soft); color: var(--success); }
.verdict[data-state="partial_match"]    { background: var(--warning-soft); color: var(--warning); }
.verdict[data-state="no_match"],
.verdict[data-state="no_outcomes"],
.verdict[data-state="error"]            { background: var(--danger-soft);  color: var(--danger);  }
.verdict[data-state="stale"]            { background: #eef1f5; color: var(--ink-soft); }

.reaction-canvas {
  min-height: 220px;
  padding: 0.5rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfbfd;
  display: grid;
  place-items: center;
  margin: 0.75rem 0;
  overflow: hidden;
}

.reaction-canvas svg {
  width: 100%;
  height: auto;
  max-width: 780px;
}

.reaction-montage {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
}

.reaction-cell {
  margin: 0;
  padding: 0.35rem 0.4rem 0.5rem;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 6px;
  min-width: 140px;
  max-width: 240px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.reaction-cell-body {
  width: 100%;
  display: grid;
  place-items: center;
}

.reaction-cell-body svg {
  width: 100%;
  height: auto;
  max-width: 220px;
  max-height: 180px;
}

.reaction-cell figcaption {
  font-size: 0.72rem;
  color: var(--ink-soft);
  text-align: center;
  word-break: break-all;
}

.reaction-cell--invalid {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.reaction-cell-body--placeholder {
  min-height: 80px;
  display: grid;
  place-items: center;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
  color: var(--danger);
  padding: 0.5rem;
  text-align: center;
  word-break: break-all;
}

.reaction-plus,
.reaction-arrow {
  font-weight: 600;
  color: var(--ink-soft);
  padding: 0 0.15rem;
  user-select: none;
}

.reaction-arrow {
  font-size: 1.6rem;
  color: var(--accent);
}

.reaction-legend {
  grid-column: 1 / -1;
  margin: 0.35rem 0 0;
  font-size: 0.72rem;
  color: var(--ink-soft);
  text-align: center;
}

/* Cross-diagram atom-map hover: an ellipse tagged with data-smarts-map is a
   hover target; when hovered, every other ellipse sharing the same map number
   also lights up. */
ellipse[data-smarts-map] {
  cursor: pointer;
}

ellipse[data-smarts-map].is-map-hover {
  fill: #ff2e63 !important;
  stroke: #ff2e63 !important;
  fill-opacity: 0.75 !important;
  stroke-opacity: 1 !important;
}

.facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.5rem;
}

.facts > div {
  padding: 0.5rem 0.6rem;
  background: #fbfbfd;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.facts dt {
  font-size: 0.7rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.15rem;
}

.facts dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.85rem;
  overflow-wrap: anywhere;
}

.compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.compare > div { display: grid; gap: 0.5rem; min-width: 0; }

.molecule-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.5rem;
}

.molecule-card {
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  background: #fbfbfd;
}

.molecule-card header {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--line);
  background: #fff;
  font-size: 0.8rem;
}

.molecule-card header span {
  color: var(--ink-soft);
  font-family: var(--mono);
}

.molecule-card .body {
  min-height: 140px;
  padding: 0.4rem;
  display: grid;
  place-items: center;
}

.molecule-card .body svg { max-height: 140px; width: auto; }

.molecule-card footer {
  padding: 0.35rem 0.6rem;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.empty-gallery {
  padding: 0.5rem 0.6rem;
  border: 1px dashed var(--line);
  border-radius: 6px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.8rem;
}

.outcomes {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.outcomes th, .outcomes td {
  text-align: left;
  padding: 0.45rem 0.6rem;
  border-bottom: 1px solid var(--line);
}

.outcomes th {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  background: #fbfbfd;
}

.outcomes td { font-family: var(--mono); }
.outcomes td:first-child, .outcomes td:last-child { width: 1%; white-space: nowrap; }

.outcomes tbody tr.is-best { background: var(--success-soft); }

.empty-row {
  color: var(--ink-soft);
  font-style: italic;
}

.form-actions {
  display: flex;
  gap: 0.5rem;
}

.form-actions button[type="button"] {
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--line);
}

.form-actions button[type="button"]:hover {
  background: var(--bg);
  color: var(--ink);
}

.app-info {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.faq {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 0;
}

.faq dt {
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.faq dd {
  margin: 0;
  color: var(--ink-soft);
}

.credits-list {
  margin: 0;
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  color: var(--ink-soft);
}

.credits-list a {
  color: var(--ink);
}

.app-footer {
  margin-top: 2rem;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--line);
  text-align: center;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.app-footer a {
  color: var(--ink-soft);
  text-decoration: underline;
  text-decoration-color: var(--line);
}

.app-footer a:hover {
  color: var(--accent);
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .compare { grid-template-columns: 1fr; }
}