:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --ink: #111111;
  --ink-soft: #666660;
  --line: #e7e7e0;
  --line-strong: #cfcfc6;
  --font-serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", "Times New Roman", serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-serif);
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "liga" 1, "tnum" 1;
}

.page-frame {
  width: min(1360px, calc(100vw - 56px));
  margin: 0 auto;
  padding-bottom: 72px;
}

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  padding: 24px 0 20px;
  border-bottom: 1px solid var(--ink);
}

.masthead-label,
.eyebrow,
.panel-label,
.stack-form span,
.summary-chip span,
.artifact-meta strong,
.backtest-grid strong,
.user-overline {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.masthead-title {
  margin: 6px 0 0;
  font-size: 1rem;
  font-weight: 400;
}

.masthead-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.shell {
  padding-top: 20px;
}

.auth-card h2,
.panel h2,
.model-title {
  margin: 0;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
}

.panel-copy,
.model-notes,
.empty-state {
  color: var(--ink-soft);
  line-height: 1.7;
}

.flash {
  margin-top: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ink);
  font-size: 0.95rem;
}

.flash.error {
  color: var(--ink-soft);
}

.summary-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.summary-chip {
  padding-right: 24px;
}

.summary-chip + .summary-chip {
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

.summary-chip strong {
  display: block;
  font-size: 2.2rem;
  line-height: 1;
  font-weight: 500;
}

.summary-chip span {
  display: block;
  margin-top: 10px;
}

.auth-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px;
  padding: 36px 0 8px;
}

.auth-card,
.rail-card,
.panel,
.model-card,
.backtest-card,
.empty-state {
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.auth-card {
  padding: 0;
}

.auth-card + .auth-card {
  padding-left: 40px;
  border-left: 1px solid var(--line);
}

.panel-copy {
  max-width: 34ch;
  margin: 10px 0 0;
}

.stack-form {
  display: grid;
  gap: 18px;
  margin-top: 22px;
}

.stack-form label {
  display: grid;
  gap: 8px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

input,
textarea,
select {
  width: 100%;
  min-height: 44px;
  padding: 12px 0;
  border: 0;
  border-bottom: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font: inherit;
  border-radius: 0;
}

textarea {
  min-height: 104px;
  resize: vertical;
  padding-top: 10px;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-bottom-width: 2px;
}

input::placeholder,
textarea::placeholder {
  color: #999991;
}

input[type="file"] {
  min-height: auto;
  padding: 10px 0;
  border-bottom-color: var(--line-strong);
}

input::file-selector-button {
  margin-right: 12px;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: var(--surface);
  padding: 6px 10px;
  color: var(--ink);
  font: inherit;
  cursor: pointer;
}

button {
  appearance: none;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: var(--surface);
  color: var(--ink);
  padding: 10px 16px;
  cursor: pointer;
  font: inherit;
  transition:
    background 140ms ease,
    color 140ms ease,
    opacity 140ms ease,
    border-color 140ms ease;
}

button:hover {
  opacity: 1;
}

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

.button-primary:hover {
  background: #000000;
}

.button-secondary:hover {
  background: #f3f3ef;
}

.button-ghost {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
}

.button-ghost:hover {
  color: var(--ink);
}

.dashboard {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 48px;
  margin-top: 36px;
  align-items: start;
}

.rail {
  display: grid;
  gap: 40px;
  position: sticky;
  top: 18px;
}

.rail-card,
.panel {
  padding: 0;
}

.rail-card + .rail-card,
.workspace > .panel + .panel {
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.workspace {
  display: grid;
  gap: 44px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--ink);
}

.comparison-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: flex-end;
}

.control-field {
  display: grid;
  gap: 8px;
  min-width: 160px;
}

.toggle-group {
  display: inline-flex;
  gap: 16px;
}

.toggle-button {
  border: 0;
  padding: 0 0 4px;
  background: transparent;
  color: var(--ink-soft);
}

.toggle-button.active {
  border-bottom: 1px solid var(--ink);
  color: var(--ink);
}

.comparison-wrapper {
  overflow-x: auto;
  padding-top: 18px;
}

.compare-table {
  width: 100%;
  min-width: 860px;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.compare-table th,
.compare-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.compare-table thead th {
  padding-top: 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.compare-table th:first-child,
.compare-table td:first-child {
  position: sticky;
  left: 0;
  z-index: 1;
  min-width: 220px;
  background: var(--surface);
}

.metric-name,
.column-title {
  display: block;
  color: var(--ink);
  font-size: 1rem;
  letter-spacing: 0;
  text-transform: none;
}

.metric-help {
  display: block;
  margin-top: 6px;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--ink-soft);
}

.column-head {
  min-width: 190px;
}

.column-meta,
.model-code {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.column-subtitle {
  display: block;
  margin-top: 8px;
  font-size: 0.94rem;
  color: var(--ink);
}

.column-date {
  display: block;
  margin-top: 5px;
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.metric-cell {
  font-variant-numeric: tabular-nums;
}

.metric-cell.best {
  font-weight: 600;
}

.metric-cell.worst {
  color: var(--ink-soft);
}

.models-grid {
  display: grid;
  gap: 52px;
}

.model-card {
  display: grid;
  gap: 24px;
  padding-top: 28px;
  border-top: 1px solid var(--ink);
}

.model-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
}

.model-code {
  margin: 0 0 10px;
}

.model-title {
  font-size: 2rem;
}

.pill-row,
.backtest-actions,
.session-lines {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.pill.seen,
.pill.unseen {
  color: var(--ink);
}

.artifact-meta {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.artifact-meta span {
  display: block;
  margin-top: 8px;
}

.upload-block {
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.upload-block h4,
.backtests-panel summary,
.backtest-card h5 {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
}

.form-note {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
  line-height: 1.6;
}

.button-danger {
  border-color: var(--line-strong);
  background: transparent;
  color: var(--ink-soft);
}

.button-danger:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.backtests-panel details {
  border-top: 1px solid var(--line);
  padding-top: 22px;
}

.backtests-panel summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

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

.backtest-list {
  margin-top: 24px;
  display: grid;
  gap: 24px;
}

.backtest-card {
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.backtest-card:first-child {
  padding-top: 0;
  border-top: 0;
}

.backtest-topline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.backtest-date,
.user-email {
  color: var(--ink-soft);
}

.backtest-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px 24px;
  margin-top: 16px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.backtest-grid div {
  padding: 0;
  border: 0;
  background: transparent;
}

.backtest-grid span {
  display: block;
  margin-top: 8px;
  font-variant-numeric: tabular-nums;
}

.backtest-foot {
  display: grid;
  gap: 8px;
  margin-top: 14px;
}

.backtest-editor {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.backtest-editor details {
  display: grid;
  gap: 16px;
}

.backtest-editor summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.backtest-editor summary::-webkit-details-marker {
  display: none;
}

.backtest-editor-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.user-overline {
  margin-bottom: 10px;
}

.user-name {
  margin: 0;
  font-size: 1.7rem;
  line-height: 1.05;
  font-weight: 500;
}

.user-email {
  margin: 8px 0 0;
}

.empty-state {
  padding-top: 18px;
}

.hidden {
  display: none !important;
}

/* Superuser pill */
.pill.superuser {
  color: var(--ink);
  font-weight: 600;
}

/* Version pill */
.pill.version {
  color: var(--ink);
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 1px;
}

/* Tag pills */
.pill.tag {
  color: var(--ink-soft);
}

/* Archived model dim */
.model-archived {
  opacity: 0.5;
}

.model-archived:hover {
  opacity: 1;
}

.pill.archived {
  color: var(--ink-soft);
}

/* Model tags row spacing */
.model-tags {
  margin-top: -8px;
}

/* Model card header right column */
.model-head-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}

/* Minimize button */
.minimize-btn {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Archived toggle label inside form */
.archived-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 0;
  padding: 0;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.archived-toggle input[type="checkbox"] {
  width: auto;
  min-height: auto;
  padding: 0;
  margin: 0;
  border: 0;
  cursor: pointer;
}

/* Users admin panel */
.users-block {
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.users-block + .users-block {
  margin-top: 32px;
}

.users-block-title {
  margin: 0 0 4px;
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.user-row {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.user-row-info {
  flex: 1;
  display: grid;
  gap: 4px;
}

.user-row-name {
  font-weight: 500;
}

.user-row-meta {
  min-width: 180px;
}

.user-row-actions {
  display: flex;
  gap: 10px;
}

@media (max-width: 760px) {
  .user-row {
    flex-wrap: wrap;
    gap: 10px;
  }

  .user-row-meta {
    min-width: 0;
    width: 100%;
  }

  .model-head-right {
    align-items: flex-start;
  }
}

@media (max-width: 1200px) {
  .dashboard {
    grid-template-columns: 1fr;
  }

  .rail {
    position: static;
  }

  .summary-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 0;
  }

  .summary-chip:nth-child(2n) {
    border-left: 1px solid var(--line);
  }

  .summary-chip:nth-child(2n + 1) {
    padding-left: 0;
    border-left: 0;
  }
}

@media (max-width: 760px) {
  .page-frame {
    width: min(100vw - 24px, 100%);
  }

  .masthead,
  .section-head,
  .artifact-meta,
  .model-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .auth-grid,
  .summary-strip {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .comparison-controls,
  .control-field {
    width: 100%;
  }

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

  .auth-card + .auth-card {
    padding-left: 0;
    padding-top: 28px;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .summary-chip,
  .summary-chip + .summary-chip {
    padding: 0;
    border-left: 0;
  }

  .compare-table {
    min-width: 700px;
  }

  .backtest-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}