:root {
  /* Backgrounds */
  --bg: #0a0a0a;
  --bg-card: rgba(255,255,255,0.025);
  --bg-elevated: rgba(255,255,255,0.05);

  /* Borders */
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(255,255,255,0.12);
  --border-focus: rgba(255,255,255,0.2);

  /* Text */
  --text-primary: #ededed;
  --text-secondary: #a0a0a0;
  --text-tertiary: #666;

  /* Accent */
  --accent: #38bdf8;
  --accent-dim: rgba(56,189,248,0.12);

  /* Semantic */
  --green: #4ade80;
  --green-dim: rgba(74,222,128,0.12);
  --red: #f87171;
  --red-dim: rgba(248,113,113,0.1);
  --yellow: #fbbf24;
  --yellow-dim: rgba(251,191,36,0.1);
  --purple: #a78bfa;
  --purple-dim: rgba(167,139,250,0.1);

  /* Geometry */
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --mono: 'SF Mono', 'JetBrains Mono', 'Fira Code', Menlo, monospace;
}

/* --- Reset --- */

*, *::before, *::after { box-sizing: border-box; }

html {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
}

body { margin: 0; min-height: 100vh; }

a { color: var(--text-secondary); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--text-primary); }
a.link { color: var(--accent); }
a.link:hover { color: var(--accent); text-decoration: underline; }

h1, h2, h3, h4 { color: var(--text-primary); line-height: 1.3; margin: 0 0 0.75rem; }
h1 { font-size: 2rem; font-weight: 700; letter-spacing: -0.025em; }
h2 { font-size: 1.35rem; font-weight: 600; letter-spacing: -0.015em; }
h3 { font-size: 1.05rem; font-weight: 600; color: var(--text-secondary); margin: 1.5rem 0 0.5rem; }

p { margin: 0 0 0.75rem; color: var(--text-secondary); line-height: 1.7; }

ul { padding-left: 1.25rem; }
li { color: var(--text-secondary); margin-bottom: 0.4rem; line-height: 1.65; }
em { color: var(--text-primary); font-style: italic; }
strong { color: var(--text-primary); font-weight: 600; }

/* --- Header --- */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 56px;
  border-bottom: 1px solid var(--border);
  background: rgba(10,10,10,0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.site-logo:hover { color: var(--text-primary); opacity: 0.8; }
.logo-mark { flex-shrink: 0; position: relative; top: -1px; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.125rem;
}

.nav-link {
  padding: 0.375rem 0.7rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-tertiary);
  text-decoration: none;
  transition: all 0.15s;
}
.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.04);
}

.nav-divider {
  width: 1px;
  height: 18px;
  background: var(--border);
  margin: 0 0.375rem;
}

.nav-link.logout:hover { color: var(--red); }

/* --- Main content --- */

.main-content {
  max-width: 960px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}
.main-content.full-width {
  max-width: 100%;
}

/* --- Flash messages --- */

.flash-msg {
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--red-dim);
  border: 1px solid rgba(248,113,113,0.15);
  color: var(--red);
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

/* --- Card --- */

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
  transition: border-color 0.2s;
}

.long-text { line-height: 1.8; }
.long-text p { margin-bottom: 1rem; }

.caption {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* --- Forms --- */

label {
  display: block;
  margin-bottom: 1rem;
}
label span {
  display: block;
  margin-bottom: 0.4rem;
  font-weight: 500;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

input, select, textarea {
  width: 100%;
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(255,255,255,0.03);
}
input[readonly] {
  cursor: not-allowed;
  background: rgba(255,255,255,0.015);
  border-style: dashed;
  border-color: rgba(255,255,255,0.04);
  color: var(--text-tertiary);
}

/* --- Buttons --- */

button {
  width: 100%;
  padding: 0.65rem 1.25rem;
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.06);
  color: var(--text-primary);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.15s;
}
button:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--border-focus);
}
button:active { opacity: 0.85; }

button.primary {
  background: var(--text-primary);
  border-color: var(--text-primary);
  color: var(--bg);
}
button.primary:hover {
  background: #fff;
  border-color: #fff;
}

/* --- Tables --- */

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
th, td {
  padding: 0.6rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}
th {
  font-weight: 500;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
}
td { color: var(--text-secondary); }

.metrics-table { width: 100%; border-collapse: collapse; margin: 0.75rem 0; }
.metrics-table th, .metrics-table td {
  padding: 0.6rem;
  border-bottom: 1px solid var(--border);
}
.metrics-table th {
  text-align: left;
  font-weight: 500;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
}

/* --- Metric cards --- */

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.metric-card {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  transition: border-color 0.2s;
}
.metric-card:hover {
  border-color: var(--border-hover);
}

.metric-label {
  font-size: 0.65rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  font-weight: 500;
}

.metric-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

/* --- Status chips --- */

.status-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-weight: 500;
  font-size: 0.7rem;
  text-transform: capitalize;
  letter-spacing: 0.02em;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}
.status-chip.status-running {
  background: var(--yellow-dim);
  border-color: rgba(251,191,36,0.15);
  color: var(--yellow);
}
.status-chip.status-completed {
  background: var(--green-dim);
  border-color: rgba(74,222,128,0.12);
  color: var(--green);
}
.status-chip.status-pending {
  background: var(--purple-dim);
  border-color: rgba(167,139,250,0.15);
  color: var(--purple);
}
.status-chip.status-failed {
  background: var(--red-dim);
  border-color: rgba(248,113,113,0.15);
  color: var(--red);
}

/* --- Action grid / button links --- */

.actions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.6rem;
  margin: 1.25rem 0;
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--text-primary);
  color: var(--bg);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.85rem;
  transition: all 0.15s;
}
.button-link:hover {
  background: #fff;
  color: #000;
}
.button-link.secondary {
  background: rgba(255,255,255,0.04);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.button-link.secondary:hover {
  background: rgba(255,255,255,0.07);
  border-color: var(--border-hover);
  color: var(--text-primary);
}
.button-link.active {
  background: var(--green);
  color: var(--bg);
  border: none;
}

/* --- Meta grid --- */

.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
  margin: 1.25rem 0;
}
.meta-grid div {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
}
.meta-label {
  display: block;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-tertiary);
  margin-bottom: 0.3rem;
  font-weight: 500;
}
.meta-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  overflow-wrap: break-word;
}

/* --- Plotly --- */

.plot-shell {
  position: relative;
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0.5rem 0;
}
.plot-shell > div { width: 100% !important; }

/* Force all Plotly chart backgrounds transparent so they inherit page bg */
.js-plotly-plot .svg-container { background: transparent !important; }
.js-plotly-plot .main-svg { background: transparent !important; }
.js-plotly-plot .main-svg > rect { fill: transparent !important; }
.js-plotly-plot .bg { fill: transparent !important; }
.plot-container { width: 100%; overflow: visible; }
.plot-container .plotly-graph-div { width: 100% !important; min-width: 0; }

/* --- Table scroll --- */

.table-scroll { width: 100%; overflow-x: auto; }
.table-scroll table { min-width: 520px; }

/* --- Auth --- */

.auth-card { max-width: 420px; margin-left: auto; margin-right: auto; }
.auth-form label { display: flex; flex-direction: column; gap: 0.35rem; }
.auth-form input { width: 100%; }

/* --- Form grids --- */

.form-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.form-grid label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  flex: 1 1 240px;
  min-width: 0;
}
.form-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-top: 1rem;
}

.form-grid input[type="date"],
.form-grid input[type="text"],
.form-grid input[type="number"],
.form-grid select {
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
  color: inherit;
  width: 100%;
  box-sizing: border-box;
}
.form-grid input[readonly],
.form-grid input[type="date"][readonly],
.form-grid input[type="text"][readonly],
.form-grid input[type="number"][readonly] {
  cursor: not-allowed;
  background: rgba(255,255,255,0.015);
  border-style: dashed;
  border-color: rgba(255,255,255,0.04);
  color: var(--text-tertiary);
}

.simulator-form { display: grid; gap: 1rem; }

/* --- Simulator compat --- */

.simulator-page { padding: 0 2rem 3rem; }
.simulator-page header { background: transparent; border-bottom: none; }
.simulator-page .card {
  background: rgba(255,255,255,0.025);
  border: 1px solid var(--border);
}
.simulator-page table {
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.01);
}
.simulator-page th, .simulator-page td { border-bottom: 1px solid var(--border); }
.simulator-page .pagination a { color: var(--accent); }

.simulator-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin: 2rem 0;
}
.simulator-grid > div {
  background: rgba(255,255,255,0.02);
  padding: 1.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  min-width: 0;
}
.simulator-grid .plot-container,
.simulator-grid .js-plotly-plot,
.simulator-grid .plotly-graph-div,
.simulator-grid .plot-container > div { width: 100% !important; max-width: 100%; }
.simulator-grid h2 { margin: 0 0 12px; }
.simulator-grid .table-scroll { margin-top: 1rem; overflow-x: inherit; }
.simulator-links {
  margin-top: 1.5rem;
  margin-bottom: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

@media (max-width: 900px) { .simulator-grid { grid-template-columns: 1fr; } }
@media (max-width: 640px) { .form-grid { flex-direction: column; } }

/* --- Secondary buttons --- */

.btn-secondary {
  width: auto;
  padding: 0.5rem 1rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-secondary:hover:not([disabled]) {
  background: rgba(255,255,255,0.07);
  border-color: var(--border-hover);
  color: var(--text-primary);
}
.btn-secondary[disabled] { cursor: progress; opacity: 0.5; }
.btn-secondary.highlight {
  background: var(--green-dim);
  border-color: rgba(74,222,128,0.15);
  color: var(--green);
}

.loader-status { min-height: 1.2rem; font-size: 0.85rem; color: var(--accent); margin-bottom: 0.5rem; }
.loader-status.error { color: var(--red); }

/* --- Manual editor --- */

.manual-preview-layout { display: flex; flex-wrap: wrap; gap: 1.5rem; margin-top: 1.5rem; }
.manual-preview-layout .manual-editor,
.manual-preview-layout .manual-preview { flex: 1 1 360px; min-width: 0; }
.manual-preview-layout textarea { min-height: 60vh; }
.manual-preview table { width: 100%; border-collapse: collapse; }
.manual-loader-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 0.75rem; }

/* --- YAML / diff --- */

.yaml-preview {
  background: rgba(255,255,255,0.025);
  border: 1px solid var(--border);
  padding: 1rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  white-space: pre-wrap;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.yaml-section { margin-top: 2rem; }
.yaml-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}
.yaml-diff {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  line-height: 1.4;
}
.diff-line { display: block; padding: 0.1rem 0.5rem; }
.diff-line.diff-header, .diff-line.diff-hunk { color: var(--accent); }
.diff-line.diff-add { background: var(--green-dim); color: #bbf7d0; }
.diff-line.diff-remove { background: var(--red-dim); color: #fecaca; }
.diff-line.diff-context { color: var(--text-tertiary); }

/* --- Run detail --- */

.run-detail__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.run-detail__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}
.run-detail__footer form { margin: 0; }

button.danger {
  background: transparent;
  color: var(--text-tertiary);
  border: none;
  padding: 0;
  cursor: pointer;
  font-size: 1.25rem;
  line-height: 1;
  width: auto;
}
button.danger:hover { color: var(--red); }
.danger-link {
  color: var(--text-tertiary);
  text-decoration: none;
  background: transparent;
  border: none;
  padding: 0;
  cursor: pointer;
  width: auto;
  display: inline;
}

/* --- Help page --- */

.predictor-help { display: flex; flex-direction: column; gap: 2rem; }
.help-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.help-nav { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.chip-link {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  background: rgba(255,255,255,0.04);
  color: var(--text-secondary);
  text-decoration: none;
  border: 1px solid var(--border);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  transition: all 0.15s;
}
.chip-link:hover {
  background: rgba(255,255,255,0.07);
  border-color: var(--border-hover);
  color: var(--text-primary);
}
.help-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.param-list { margin: 0; display: grid; gap: 1rem; }
.param-row { display: grid; gap: 0.35rem; }
.param-row dt { font-weight: 600; color: var(--text-primary); }
.param-row dt code {
  background: rgba(255,255,255,0.05);
  padding: 0.15rem 0.4rem;
  border-radius: 5px;
  border: 1px solid var(--border);
  font-size: 0.85em;
  font-family: var(--mono);
}
.param-row dd { margin: 0; color: var(--text-secondary); line-height: 1.5; }
.help-footer { display: flex; justify-content: flex-end; }

/* --- Alert --- */

.alert { padding: 0.75rem 1rem; border-radius: var(--radius-sm); margin-bottom: 1rem; }
.alert-info {
  background: var(--accent-dim);
  border: 1px solid rgba(56,189,248,0.12);
  color: var(--accent);
}

/* --- CodeMirror --- */

.CodeMirror {
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
  color: var(--text-primary);
  font-family: var(--mono);
  font-size: 0.9rem;
}
.CodeMirror-gutters {
  background: rgba(255,255,255,0.02);
  border-right: 1px solid var(--border);
}
.CodeMirror-linenumber { color: var(--text-tertiary); }

/* ================================================================
   Research pages
   ================================================================ */

.research-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.research-nav a {
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  background: transparent;
  color: var(--text-tertiary);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 500;
  transition: all 0.15s;
}
.research-nav a:hover {
  color: var(--text-secondary);
  background: rgba(255,255,255,0.04);
}
.research-nav a.active {
  background: rgba(255,255,255,0.07);
  color: var(--text-primary);
  font-weight: 600;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--text-tertiary);
  margin-top: -0.25rem;
  margin-bottom: 1.5rem;
}

/* Heatmap */

.heatmap-table { border-collapse: separate; border-spacing: 3px; font-size: 0.78rem; text-align: center; }
.heatmap-table th { padding: 0.3rem 0.2rem; font-weight: 500; color: var(--text-tertiary); font-size: 0.65rem; text-transform: uppercase; }
.heatmap-year { font-weight: 600; text-align: left; padding-right: 0.5rem; color: var(--text-secondary); font-size: 0.8rem; }
.heatmap-cell {
  padding: 0.3rem 0.2rem;
  border-radius: 4px;
  font-size: 0.72rem;
  font-variant-numeric: tabular-nums;
  min-width: 2.8rem;
  transition: transform 0.1s;
}
.heatmap-cell:hover { transform: scale(1.08); }
.heatmap-pos { background: var(--green-dim); color: var(--green); }
.heatmap-neg { background: var(--red-dim); color: var(--red); }
.heatmap-empty { background: transparent; }

/* Lesson list */

.lesson-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.lesson-list li {
  padding: 0.75rem 1rem;
  background: rgba(255,255,255,0.02);
  border-left: 2px solid rgba(255,255,255,0.08);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  line-height: 1.6;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Flash compat */

.flash-messages { list-style: none; padding: 0; margin: 1rem 0; }
.flash-messages li { background: var(--red-dim); padding: 0.75rem 1rem; border-radius: var(--radius-sm); }

/* Misc compat */

.metric-table h3 { margin-bottom: 0.75rem; }
.no-underline { text-decoration: none; }

/* --- Site footer --- */

.site-footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-tertiary);
}