@import url('https://fonts.googleapis.com/css2?family=Crimson+Pro:ital,wght@0,400;0,600;0,700;1,400&family=IBM+Plex+Mono:wght@400;500&family=Inter:wght@400;500;700&display=swap');

:root { 
  --ink: #1a1a17; 
  --muted: #5e5e5e; 
  --paper: #fdf9d8; 
  --panel: #fcf9e2; 
  --line: #dcd7b5; 
  --border: var(--line);
  --accent: #841617; 
  --crimson-light: #a33132;
  --cream-white: #ffffff;
  --shadow: 0 4px 12px rgba(132, 22, 23, 0.08);
  --radius: 8px;
}

* { box-sizing: border-box; }

body { 
  margin: 0; 
  color: var(--ink); 
  background: var(--paper); 
  font: 18px/1.6 'Crimson Pro', serif; 
  -webkit-font-smoothing: antialiased;
}

body::before { content: ''; display: block; height: 6px; background: var(--accent); }

a { color: inherit; text-decoration-color: rgba(132, 22, 23, 0.3); }

.topbar { 
  border-bottom: 2px solid var(--accent); 
  padding: 1.25rem max(6vw, 2rem); 
  font: 700 13px 'Inter', sans-serif; 
  text-transform: uppercase;
  letter-spacing: .12em; 
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  background: rgba(253, 249, 216, 0.95);
  backdrop-filter: blur(12px);
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.topbar a { text-decoration: none; color: var(--accent); transition: color 0.2s; }
.topbar a:hover { color: var(--crimson-light); }

.topnav {
  display: flex;
  gap: 1.5rem;
  justify-content: flex-end;
  align-items: center;
  flex-wrap: wrap;
}

.topnav a {
  white-space: nowrap;
}

.shell { 
  width: min(1000px, calc(100% - 64px)); 
  margin: 0 auto; 
  padding: 5rem 0 10rem; 
}

.hero { margin-bottom: 4rem; text-align: center; }

.eyebrow { 
  color: var(--accent); 
  font: 700 12px 'Inter', sans-serif; 
  letter-spacing: .15em; 
  text-transform: uppercase; 
  margin-bottom: 1rem;
  display: block;
  opacity: 0.8;
}

h1, h2, h3 { font-family: 'Inter', sans-serif; font-weight: 700; color: var(--accent); margin-top: 0; }

h1 { font-size: clamp(2.5rem, 5vw, 4rem); line-height: 1.05; margin: 0 auto 2rem; letter-spacing: -0.03em; max-width: 20ch; }
h2 { font-size: 1.6rem; margin: 4rem 0 1.5rem; display: flex; align-items: center; gap: 1rem; }
h2::after { content: ''; flex: 1; height: 1px; background: var(--line); }
h3 { font-size: 1.1rem; margin: 2rem 0 0.5rem; }

.lede { font-size: 1.25rem; line-height: 1.6; color: var(--muted); margin: 0 auto 3rem; max-width: 50ch; }

p { margin-bottom: 1.5rem; }

.workflow-list {
  margin: 0 0 1.5rem 1.25rem;
  padding-left: 1rem;
  color: var(--ink);
  font-family: 'Inter', sans-serif;
}

.workflow-list li {
  margin-bottom: 0.85rem;
}

.workflow-list li::marker {
  color: var(--accent);
  font-weight: 700;
}

.choices { 
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); 
  gap: 1.5rem; 
  margin-top: 4rem; 
}

.choices--training {
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.choice { 
  display: flex;
  flex-direction: column;
  background: var(--panel); 
  border: 1px solid var(--line); 
  padding: 2.25rem; 
  text-decoration: none; 
  transition: all .3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}

.choice:hover { 
  border-color: var(--accent); 
  background: var(--cream-white); 
  transform: translateY(-8px); 
  box-shadow: var(--shadow);
}

.choice h2 { 
  margin-bottom: 1rem; 
  border: 0; 
  padding: 0; 
  font-size: 1.3rem; 
}
.choice h2::after { display: none; }

.choice p { 
  margin-bottom: 2rem; 
  font-size: 0.95rem; 
  color: var(--muted); 
  font-family: 'Inter', sans-serif; 
  flex: 1;
}

.flash.info {
  margin-bottom: 2rem;
  border-left: 4px solid var(--accent);
  background: rgba(132, 22, 23, 0.05);
}

.form-panel--spaced {
  margin-top: 2rem;
}

.training-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: 1.5rem;
  align-items: start;
  margin-top: 2rem;
}

.training-form-panel {
  margin-top: 0;
}

.dataset-list {
  margin-top: 3rem;
}

.dataset-table {
  width: 100%;
  font-size: 0.8rem;
  border-collapse: collapse;
  margin: 0;
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.dataset-table thead tr {
  text-align: left;
  border-bottom: 2px solid var(--border);
}

.dataset-table th,
.dataset-table td {
  padding: 0.75rem;
}

.dataset-table tbody tr {
  border-bottom: 1px solid var(--border);
}

.dataset-table tbody tr:last-child {
  border-bottom: 0;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.action { 
  font-weight: 700; 
  font-family: 'Inter', sans-serif; 
  font-size: 0.85rem; 
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent); 
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.action::after { content: '→'; transition: transform 0.2s; }
.choice:hover .action::after { transform: translateX(4px); }

.training-guide {
  margin-top: 2rem;
  padding: 1.75rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.training-guide--sidebar {
  margin-top: 0;
  height: 100%;
}

.training-guide-lede {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
}

.training-guide-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.training-guide-card {
  background: var(--cream-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.25rem 1.35rem;
}

.training-guide-card h3 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
}

.training-guide-card p {
  margin: 0 0 0.75rem;
  font-family: 'Inter', sans-serif;
  font-size: 0.92rem;
  color: var(--muted);
}

.training-guide-card p:last-child {
  margin-bottom: 0;
}

.back { 
  display: inline-flex; 
  align-items: center;
  gap: 0.5rem;
  color: var(--muted); 
  text-decoration: none; 
  margin-bottom: 2.5rem; 
  font: 600 13px 'Inter', sans-serif; 
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all 0.2s; 
}
.back:hover { color: var(--accent); transform: translateX(-4px); }

.page-heading { margin-bottom: 4rem; border-bottom: 1px solid var(--line); padding-bottom: 2rem; }
.page-heading h1 { font-size: 3rem; margin-bottom: 1rem; }
.page-heading .lede { margin: 0; text-align: left; }

.dataset-picker { background: var(--panel); padding: 2rem; border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 3rem; }

code { font-family: 'IBM Plex Mono', monospace; background: rgba(132, 22, 23, 0.08); padding: 0.2rem 0.4rem; font-size: 0.85em; border-radius: 4px; color: var(--accent); }

.form-panel { 
  background: var(--panel); 
  border: 1px solid var(--line); 
  padding: 3rem; 
  margin: 2.5rem 0;
  border-radius: var(--radius);
  box-shadow: 0 4px 15px rgba(0,0,0,0.03);
}

label { display: block; font-weight: 700; margin-bottom: 1.5rem; font-family: 'Inter', sans-serif; font-size: 0.9rem; color: var(--accent); }
input, select, textarea { 
  display: block; 
  width: 100%; 
  border: 1px solid var(--line); 
  background: var(--cream-white); 
  color: var(--ink); 
  font: 16px 'Inter', sans-serif; 
  margin-top: 0.6rem; 
  padding: 0.85rem 1.25rem; 
  border-radius: 6px;
  transition: all 0.2s;
  resize: vertical;
}

input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(132, 22, 23, 0.1); }

.plot-result { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); margin: 4rem 0; padding: 3rem; text-align: center; }
.plot-result img { display: block; margin: 0 auto; max-width: 100%; height: auto; border-radius: 4px; }

.chart-frame {
  margin-top: 2.5rem;
  padding: 1.25rem;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border);
  border-radius: 16px;
  text-align: left;
}

.chart-frame h2 {
  margin: 0 0 1rem;
}

.chart-frame img {
  width: 100%;
  height: auto;
  display: block;
}

.chart-explanation { 
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 2rem 0;
  margin: 3rem 0;
  font-family: 'Crimson Pro', serif;
  font-size: 1.1rem;
}

.chart-explanation .eyebrow { margin-bottom: 0.75rem; }

.chart-explanation--intro {
  margin-top: 0;
  margin-bottom: 2rem;
}

.chart-source {
  color: var(--ink);
  margin-bottom: 0.5rem;
}

.source-link {
  text-decoration: underline;
  text-decoration-thickness: 1px;
}

.plot-form {
  gap: 1.5rem;
}

.plot-form-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 2rem;
}

.plot-form-title {
  margin: 0;
  font-family: 'Inter', sans-serif;
  font-size: clamp(1.6rem, 2.3vw, 2.1rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--accent);
  letter-spacing: -0.03em;
}

.plot-guidance {
  max-width: 42ch;
  margin: 0;
  padding: 1rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.55);
  color: var(--muted);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
}

.plot-dimension-fieldset {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.25rem 1.25rem;
  background: rgba(255, 255, 255, 0.45);
}

.plot-dimension-fieldset legend {
  padding: 0 0.35rem;
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.dimension-toggle {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.dimension-chip {
  position: relative;
  display: inline-flex;
  cursor: pointer;
  margin-bottom: 0;
}

.dimension-chip input {
  position: absolute;
  inset: 0;
  opacity: 0;
  margin: 0;
}

.dimension-chip span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 110px;
  padding: 0.85rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--cream-white);
  color: var(--muted);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  transition: all 0.2s;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.dimension-chip:hover span,
.dimension-chip input:focus-visible + span {
  border-color: var(--accent);
}

.dimension-chip input:checked + span {
  border-color: var(--accent);
  background: rgba(132, 22, 23, 0.08);
  color: var(--accent);
  box-shadow: 0 0 0 3px rgba(132, 22, 23, 0.08);
}

.plot-form .form-grid {
  margin-top: 0.25rem;
}

.axis-field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  color: var(--accent);
}

.axis-field[hidden] {
  display: none !important;
}

.axis-field select {
  margin-top: 0;
  background: var(--cream-white);
  border: 1.5px solid var(--line);
  font-weight: 500;
}

.axis-field select:hover {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(132, 22, 23, 0.1);
}

.axis-field select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(132, 22, 23, 0.1);
}

.plot-form button {
  align-self: flex-start;
}

.results-filter {
  margin-bottom: 2rem;
}

.results-table-shell {
  background: var(--cream-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0;
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.results-table thead tr {
  text-align: left;
  border-bottom: 2px solid var(--border);
}

.results-table th,
.results-table td {
  padding: 0.75rem;
  vertical-align: top;
}

.results-table tbody tr {
  border-bottom: 1px solid var(--border);
}

.results-table tbody tr:last-child {
  border-bottom: 0;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font: 600 0.78rem 'Inter', sans-serif;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1;
}

.status-badge.is-success {
  background: rgba(76, 175, 80, 0.1);
  color: #2e7d32;
}

.status-badge.is-error {
  background: rgba(244, 67, 54, 0.1);
  color: #d32f2f;
}

.status-message {
  margin-top: 0.35rem;
  font-size: 0.75rem;
  color: #d32f2f;
}

.form-grid--single {
  grid-template-columns: 1fr;
  margin-bottom: 2rem;
}

.hint {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted);
  font: 500 0.82rem/1.45 'Inter', sans-serif;
}

.metrics-grid--single {
  grid-template-columns: minmax(220px, 320px);
  justify-content: center;
}

.dictionary-panel {
  margin-bottom: 4rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.dictionary-panel > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  cursor: pointer;
  list-style: none;
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 1.6rem;
  color: var(--accent);
  margin: 0;
}

.dictionary-panel > summary::-webkit-details-marker {
  display: none;
}

.dictionary-panel > summary::after {
  content: 'Show';
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.dictionary-panel[open] > summary::after {
  content: 'Hide';
}

.dictionary-panel .table-scroll {
  margin-top: 1.5rem;
}

.explorer-nav { display: flex; border-bottom: 1px solid var(--line); margin: 0 0 4rem; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.explorer-nav a { 
  color: var(--muted); 
  padding: 1.25rem 2rem; 
  text-decoration: none; 
  font: 600 13px 'Inter', sans-serif; 
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 3px solid transparent;
  white-space: nowrap;
  transition: all 0.2s;
}
.explorer-nav a:hover { color: var(--accent); }
.explorer-nav a.active { color: var(--accent); border-bottom-color: var(--accent); }

.metrics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; margin: 3rem 0; }
.metric-box { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 2.5rem 1.5rem; text-align: center; }
.metric { font: 800 3rem 'Inter', sans-serif; margin: 0; color: var(--accent); letter-spacing: -0.02em; }
.metric small { display: block; font: 700 11px 'Inter', sans-serif; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin-top: 0.75rem; }

button, .button-link { 
  display: inline-block;
  background: var(--accent); 
  border: 0; 
  color: white; 
  cursor: pointer; 
  font: 700 13px 'Inter', sans-serif; 
  padding: 1.15rem 2.5rem; 
  text-transform: uppercase;
  letter-spacing: 0.12em;
  border-radius: 6px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
}

button:hover, .button-link:hover { background: var(--crimson-light); transform: translateY(-2px); box-shadow: var(--shadow); color: white; }
button:active, .button-link:active { transform: translateY(0); }

.status { font-family: 'IBM Plex Mono', monospace; font-size: 0.8rem; color: var(--muted); margin-top: 4rem; text-align: center; }

table { width: 100%; border-collapse: collapse; margin: 3rem 0; font-family: 'Inter', sans-serif; font-size: 0.95rem; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.02); }
th { text-align: left; padding: 1.25rem 1.5rem; border-bottom: 2px solid var(--accent); color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.75rem; font-weight: 800; background: rgba(132, 22, 23, 0.05); }
td { padding: 1.25rem 1.5rem; border-bottom: 1px solid var(--line); }
tr:last-child td { border-bottom: 0; }
tr:hover { background: var(--cream-white); }

.result { padding: 4rem; border: 2px solid var(--line); margin: 3rem 0; border-radius: var(--radius); text-align: center; }
.result.success { border-color: #27ae60; background: rgba(39, 174, 96, 0.05); }
.result.warning { border-color: var(--accent); background: rgba(132, 22, 23, 0.05); }
.result h1 { margin: 0 0 1rem; }
.result .lede { margin-left: auto; margin-right: auto; }

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.flash { 
  padding: 1.25rem 2rem; 
  margin-bottom: 3rem; 
  border-left: 6px solid var(--accent); 
  background: var(--panel); 
  border-radius: 4px;
  font: 600 14px 'Inter', sans-serif; 
  box-shadow: var(--shadow);
}

.choice-jupyter { 
  background: var(--cream-white); 
  border-style: dashed; 
  border-width: 2px;
}

@media (max-width: 768px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem 1.25rem;
  }

  .topnav {
    width: 100%;
    justify-content: flex-start;
    gap: 0.75rem 1rem;
  }

  .shell { width: calc(100% - 24px); padding: 2rem 0 4rem; }
  .hero { margin-bottom: 2.5rem; text-align: left; }
  h1 { font-size: 2.3rem; }
  h2 { margin-top: 2.5rem; font-size: 1.35rem; }
  .page-heading h1 { font-size: 2.1rem; }
  .choices { grid-template-columns: 1fr; }
  .choice { padding: 1.5rem; }
  .metrics-grid { grid-template-columns: 1fr; }
  .choices--training { grid-template-columns: 1fr; gap: 2rem; }
  .training-layout { grid-template-columns: 1fr; }
  .form-panel, .dataset-picker, .plot-result, .result { padding: 1.5rem; }
  .flash { padding: 1rem 1.25rem; }
  .explorer-nav a { padding: 1rem 1.25rem; }
  .table-scroll table { min-width: 640px; }
  th, td { padding: 0.9rem 1rem; }
}

@media (max-width: 480px) {
  .shell { width: calc(100% - 16px); }
  h1 { font-size: 2rem; }
  .page-heading h1 { font-size: 1.85rem; }
  .choice p, .lede { font-size: 1.1rem; }
  .topnav a { font-size: 12px; }
}