:root {
  --ink: #18282f;
  --muted: #64757d;
  --bg: #eef4f5;
  --panel: #fbfdfd;
  --line: #d4e1e5;
  --accent: #2f6f6a;
  --accent-2: #345f8c;
  --gold: #b4822b;
  --danger: #a13f4f;
  --shadow: 0 14px 36px rgba(25, 45, 52, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  font: 15px/1.5 Arial, Helvetica, sans-serif;
  background:
    linear-gradient(rgba(47, 111, 106, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(47, 111, 106, 0.08) 1px, transparent 1px),
    var(--bg);
  background-size: 30px 30px;
}

.shell-header {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  align-items: flex-end;
  padding: 2.4rem clamp(1rem, 4vw, 3rem) 1.5rem;
  color: #effafa;
  background:
    linear-gradient(110deg, rgba(16, 38, 45, 0.96), rgba(36, 78, 87, 0.9)),
    radial-gradient(circle at 85% 12%, rgba(111, 196, 186, 0.28), transparent 34%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.brand-block {
  min-width: 0;
}

.brand-logo {
  display: block;
  width: min(520px, 54vw);
  height: auto;
  margin: 0 0 1rem;
}

.eyebrow {
  margin: 0 0 0.35rem;
  color: var(--accent-2);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.shell-header .eyebrow {
  color: #9fe2d9;
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.05;
}

h2 {
  font-size: 1.12rem;
}

h3 {
  margin-bottom: 0.75rem;
  font-size: 0.96rem;
}

.lead {
  max-width: 680px;
  margin: 0.85rem 0 0;
  color: rgba(239, 250, 250, 0.86);
}

.header-actions {
  display: grid;
  gap: 0.65rem;
  justify-items: end;
}

.home-link {
  display: inline-flex;
  align-items: center;
  min-height: 2.45rem;
  padding: 0 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: 0.28rem;
  color: #effafa;
  font-weight: 800;
  text-decoration: none;
}

.home-link:hover {
  border-color: rgba(159, 226, 217, 0.95);
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
}

.status-pill {
  min-width: 150px;
  padding: 0.5rem 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  color: #def5f2;
  text-align: center;
  white-space: nowrap;
}

.status-pill.ok {
  border-color: rgba(127, 226, 196, 0.85);
  background: rgba(127, 226, 196, 0.14);
}

.status-pill.error {
  border-color: rgba(255, 160, 160, 0.8);
  background: rgba(255, 160, 160, 0.12);
}

.app-grid {
  display: grid;
  grid-template-columns: minmax(360px, 0.95fr) minmax(480px, 1.45fr);
  gap: 1rem;
  align-items: stretch;
  padding: 1rem clamp(1rem, 4vw, 3rem) 2.5rem;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.input-panel,
.results-panel,
.attribution-panel {
  padding: 1rem;
}

.attribution-panel {
  grid-column: 1 / -1;
}

.panel-heading {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
  margin-bottom: 1rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
}

label {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

textarea,
select,
input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 0.28rem;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

textarea {
  min-height: 260px;
  padding: 0.8rem;
  font-family: Consolas, Monaco, monospace;
  resize: vertical;
}

select,
input {
  min-height: 2.35rem;
  padding: 0.35rem 0.5rem;
}

textarea:focus,
select:focus,
input:focus {
  outline: 2px solid rgba(47, 111, 106, 0.18);
  border-color: var(--accent);
}

.hint {
  margin: 0.45rem 0 1rem;
  color: var(--muted);
  font-size: 0.83rem;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0.8rem 0;
}

.advanced-params {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.advanced-params details {
  border: 1px solid var(--line);
  border-radius: 0.38rem;
  background: #fff;
}

.advanced-params summary {
  padding: 0.72rem 0.85rem;
  color: var(--ink);
  font-weight: 800;
  cursor: pointer;
}

.advanced-params details[open] summary {
  border-bottom: 1px solid var(--line);
  background: #f4f8f9;
}

.advanced-params .control-grid,
.advanced-params .param-note {
  margin-right: 0.85rem;
  margin-left: 0.85rem;
}

.param-note {
  margin-top: -0.15rem;
  color: var(--muted);
  font-size: 0.81rem;
}

.check-label {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.45rem;
  min-height: 2.35rem;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 0.28rem;
  background: #fff;
}

.check-label input {
  width: auto;
  min-height: 0;
}

.switch-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin: 0.8rem 0;
}

.switch-row label {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  gap: 0.35rem;
}

button {
  min-height: 2.45rem;
  border: 1px solid var(--accent);
  border-radius: 0.28rem;
  background: #fff;
  color: var(--accent);
  font-weight: 800;
  cursor: pointer;
}

button:hover:not(:disabled) {
  border-color: var(--accent-2);
  color: var(--accent-2);
}

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

.primary {
  width: 100%;
  margin-top: 0.5rem;
  background: var(--accent);
  color: #fff;
}

.ghost {
  padding: 0 0.8rem;
}

.message {
  min-height: 4.2rem;
  margin: 1rem 0 0;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 0.28rem;
  background: #f5f9fa;
  color: var(--muted);
  white-space: pre-wrap;
}

.message.error {
  border-left-color: var(--danger);
  color: var(--danger);
}

.meta {
  color: var(--muted);
  font-size: 0.84rem;
}

.results-list {
  display: grid;
  gap: 0.85rem;
  max-height: 520px;
  overflow: auto;
  padding-right: 0.2rem;
}

.candidate-card {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 0.9rem;
  padding: 0.8rem;
  border: 1px solid var(--line);
  border-radius: 0.4rem;
  background: #fff;
  cursor: pointer;
}

.candidate-card.selected {
  border-color: var(--accent);
  box-shadow: inset 4px 0 0 var(--accent);
}

.structure {
  display: grid;
  place-items: center;
  min-height: 145px;
  border: 1px solid #edf2f3;
  background: #fff;
}

.structure svg {
  max-width: 100%;
  height: auto;
}

.candidate-meta {
  display: grid;
  gap: 0.38rem;
  min-width: 0;
}

.candidate-title {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-weight: 800;
}

.score {
  color: var(--gold);
}

.smiles {
  overflow: hidden;
  color: var(--muted);
  font-family: Consolas, Monaco, monospace;
  font-size: 0.82rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.small-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.45rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.candidate-spectrum-figure {
  display: none;
  margin: 1rem 0 0;
}

.candidate-spectrum-figure figcaption {
  margin-bottom: 0.35rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

#candidateSpectrumImage {
  display: block;
  width: 100%;
  min-height: 260px;
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  background: #fff;
  object-fit: contain;
}

.attribution-summary {
  min-height: 2.8rem;
  margin-bottom: 1rem;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-left: 4px solid var(--gold);
  border-radius: 0.28rem;
  background: #fff;
  color: var(--muted);
}

.attribution-body {
  display: grid;
  grid-template-columns: minmax(360px, 0.9fr) minmax(360px, 1.1fr);
  gap: 1rem;
}

#attributionImage,
#assignmentImage {
  display: none;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  background: #fff;
}

.assignment-figure,
.structure-figure {
  margin: 0;
}

.assignment-figure {
  grid-column: 1 / -1;
}

.structure-compare {
  display: none;
  grid-column: 1 / -1;
  grid-template-columns: repeat(2, minmax(320px, 1fr));
  gap: 0.8rem;
}

.structure-compare figure {
  margin: 0;
}

.structure-compare img {
  display: block;
  width: 100%;
  min-height: 360px;
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  background: #fff;
  object-fit: contain;
}

#assignmentImage {
  min-height: 430px;
  object-fit: contain;
}

#attributionImage {
  min-height: 420px;
  object-fit: contain;
}

.assignment-figure figcaption,
.structure-figure figcaption,
.structure-compare figcaption {
  margin-bottom: 0.35rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.fragments-list {
  display: grid;
  gap: 0.8rem;
  max-height: 760px;
  overflow: auto;
}

.fragment-row,
.fragment-card {
  padding: 0.65rem;
  border: 1px solid var(--line);
  border-radius: 0.32rem;
  background: #fff;
  color: var(--muted);
  font-size: 0.85rem;
}

.fragment-row strong,
.fragment-card strong {
  color: var(--ink);
}

.fragment-card {
  display: grid;
  gap: 0.65rem;
}

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

.fragment-card-head span {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  white-space: nowrap;
}

.fragment-visuals {
  display: grid;
  grid-template-columns: minmax(180px, 0.75fr) minmax(280px, 1.25fr);
  gap: 0.65rem;
}

.fragment-visuals figure {
  margin: 0;
}

.fragment-visuals figcaption {
  margin-bottom: 0.25rem;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.fragment-visuals img,
.empty-visual {
  display: block;
  width: 100%;
  min-height: 160px;
  border: 1px solid #edf2f3;
  border-radius: 0.28rem;
  background: #fff;
  object-fit: contain;
}

.empty-visual {
  display: grid;
  place-items: center;
  color: var(--muted);
}

.fragment-metrics {
  display: grid;
  gap: 0.22rem;
}

@media (max-width: 980px) {
  .shell-header,
  .app-grid,
  .attribution-body {
    grid-template-columns: 1fr;
  }

  .shell-header {
    display: grid;
    align-items: start;
  }

  .brand-logo {
    width: min(420px, 82vw);
  }

  .header-actions {
    justify-items: start;
  }

  .control-grid {
    grid-template-columns: 1fr;
  }

  .candidate-card {
    grid-template-columns: 1fr;
  }

  .fragment-visuals {
    grid-template-columns: 1fr;
  }

  .structure-compare {
    grid-template-columns: 1fr;
  }
}