/* =============================================================================
   Schemata — Editorial schematic design system, light theme
   ============================================================================= */

@import url("https://fonts.googleapis.com/css2?family=Inter+Tight:wght@400;500;600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap");

/* -----------------------------------------------------------------------------
   Tokens
   ----------------------------------------------------------------------------- */
:root {
  /* Color — palette */
  --color-paper: #efede6;
  --color-sheet: #ffffff;
  --color-ink: #14141c;
  --color-graphite: #6f6e78;
  --color-hairline: #d6d2c7;
  --color-violet: #5b4bff;
  --color-violet-soft: #e7e2ff;
  --color-signal: #f2e94e;

  /* Color — semantic */
  --color-bg: var(--color-paper);
  --color-surface: var(--color-sheet);
  --color-surface-sunken: #e7e4dc;
  --color-text: var(--color-ink);
  --color-text-muted: var(--color-graphite);
  --color-text-on-accent: #ffffff;
  --color-border: var(--color-hairline);
  --color-border-strong: var(--color-ink);
  --color-accent: var(--color-violet);
  --color-accent-soft: var(--color-violet-soft);
  --color-focus-ring: rgba(91, 75, 255, 0.28);

  /* Typography */
  --font-display: "Inter Tight", ui-sans-serif, system-ui, sans-serif;
  --font-sans: "Inter", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --text-display: clamp(48px, 6vw, 72px);
  --text-h1: 44px;
  --text-h2: 32px;
  --text-h3: 22px;
  --text-body: 16px;
  --text-body-sm: 14px;
  --text-label: 12px;
  --text-mono: 11px;

  --tracking-display: -0.02em;
  --tracking-mono: 0.12em;
  --leading-tight: 1.05;
  --leading-snug: 1.25;
  --leading-body: 1.55;

  /* Spacing — 4px base */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 40px;
  --space-9: 56px;
  --space-10: 72px;

  /* Radius */
  --radius-0: 0px;
  --radius-1: 2px;
  --radius-2: 4px;
  --radius-3: 6px;
  --radius-4: 8px;
  --radius-pill: 999px;

  /* Borders */
  --border-hairline: 1px solid var(--color-border);
  --border-ink: 1px solid var(--color-border-strong);
  --border-dashed: 1px dashed var(--color-border);

  /* Elevation — flat material, no shadows */
  --elev-flat: 0 0 0 1px var(--color-border);
  --elev-keyline: 0 0 0 1px var(--color-ink);
  --focus-ring: 0 0 0 2px var(--color-accent), 0 0 0 6px var(--color-focus-ring);

  /* Motion */
  --ease-out: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur-fast: 120ms;
  --dur-base: 200ms;

  /* Grid */
  --container: 1200px;
  --gutter: 24px;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  font-feature-settings: "ss01", "cv01";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--color-accent-soft);
  color: var(--color-ink);
}

/* -----------------------------------------------------------------------------
   Typography
   ----------------------------------------------------------------------------- */
.display,
.h1,
.h2,
.h3 {
  font-family: var(--font-display);
  color: var(--color-text);
  margin: 0;
}

.display {
  font-size: var(--text-display);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-display);
  font-weight: 600;
}

.h1 {
  font-size: var(--text-h1);
  line-height: var(--leading-snug);
  letter-spacing: -0.01em;
  font-weight: 600;
}

.h2 {
  font-size: var(--text-h2);
  line-height: var(--leading-snug);
  letter-spacing: -0.01em;
  font-weight: 600;
}

.h3 {
  font-size: var(--text-h3);
  line-height: var(--leading-snug);
  font-weight: 600;
}

.body {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text);
}

.body-sm {
  font-size: var(--text-body-sm);
  line-height: 1.5;
  color: var(--color-text);
}

.muted {
  color: var(--color-text-muted);
}

.label {
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  color: var(--color-text-muted);
  font-weight: 500;
}

.label-ink {
  color: var(--color-text);
}

.kbd {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 6px;
  border: var(--border-hairline);
  border-radius: var(--radius-2);
  background: var(--color-surface);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

/* -----------------------------------------------------------------------------
   Layout primitives
   ----------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.grid {
  display: grid;
  gap: var(--gutter);
}

.divider {
  height: 1px;
  background: var(--color-border);
  border: 0;
  margin: var(--space-6) 0;
}

.divider-dashed {
  height: 0;
  border: 0;
  border-top: var(--border-dashed);
  margin: var(--space-6) 0;
}

.index-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.index-tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border: 1px solid var(--color-ink);
  display: inline-block;
}

/* -----------------------------------------------------------------------------
   Card — sheet on paper with hairline frame
   ----------------------------------------------------------------------------- */
.card {
  position: relative;
  background: var(--color-surface);
  border: var(--border-hairline);
  border-radius: var(--radius-4);
  padding: var(--space-6);
  color: var(--color-text);
}

.card--inset {
  background: var(--color-bg);
}

.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.card__title {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
}

.card__footer {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-dashed);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-text-muted);
}

/* -----------------------------------------------------------------------------
   Button
   ----------------------------------------------------------------------------- */
.btn {
  --btn-bg: var(--color-ink);
  --btn-fg: var(--color-paper);
  --btn-border: var(--color-ink);

  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 40px;
  padding-inline: 18px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-border);
  border-radius: var(--radius-3);
  font-family: var(--font-sans);
  font-size: var(--text-body-sm);
  font-weight: 500;
  letter-spacing: 0;
  cursor: pointer;
  transition: background var(--dur-base) var(--ease-out),
    color var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out),
    transform var(--dur-fast) var(--ease-out);
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover {
  --btn-bg: #20202a;
}

.btn:active {
  transform: translateY(1px);
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.btn--accent {
  --btn-bg: var(--color-accent);
  --btn-fg: #ffffff;
  --btn-border: var(--color-accent);
}

.btn--accent:hover {
  --btn-bg: #4a3aee;
}

.btn--ghost {
  --btn-bg: var(--color-surface);
  --btn-fg: var(--color-ink);
  --btn-border: var(--color-border);
}

.btn--ghost:hover {
  --btn-bg: var(--color-bg);
  --btn-border: var(--color-ink);
}

.btn--mono {
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
}

.btn--sm {
  height: 32px;
  padding-inline: 12px;
  font-size: var(--text-body-sm);
}

.btn--block {
  width: 100%;
}

/* -----------------------------------------------------------------------------
   Input & Field
   ----------------------------------------------------------------------------- */
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field__label {
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.field__hint {
  font-size: 12px;
  color: var(--color-text-muted);
}

.input {
  appearance: none;
  width: 100%;
  height: 40px;
  padding: 0 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-3);
  font-family: var(--font-sans);
  font-size: var(--text-body-sm);
  color: var(--color-text);
  transition: border-color var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out);
}

.input::placeholder {
  color: var(--color-text-muted);
}

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

.input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-focus-ring);
}

.input-group {
  position: relative;
}

.input-group .input {
  padding-right: 44px;
}

.input-group__trailing {
  position: absolute;
  top: 50%;
  right: 8px;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-muted);
  pointer-events: none;
}

/* -----------------------------------------------------------------------------
   Checkbox
   ----------------------------------------------------------------------------- */
.check {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
}

.check input[type="checkbox"] {
  appearance: none;
  width: 18px;
  height: 18px;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-1);
  background: var(--color-surface);
  display: inline-grid;
  place-content: center;
  cursor: pointer;
  transition: background var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out);
  margin: 0;
}

.check input[type="checkbox"]::after {
  content: "";
  width: 10px;
  height: 6px;
  border-left: 2px solid #ffffff;
  border-bottom: 2px solid #ffffff;
  transform: rotate(-45deg) translate(1px, -1px);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-out);
}

.check input[type="checkbox"]:checked {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.check input[type="checkbox"]:checked::after {
  opacity: 1;
}

.check input[type="checkbox"]:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.check__label {
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  color: var(--color-text);
}

/* -----------------------------------------------------------------------------
   Tabs — underline
   ----------------------------------------------------------------------------- */
.tabs {
  display: flex;
  gap: var(--space-6);
  border-bottom: var(--border-hairline);
}

.tab {
  appearance: none;
  background: transparent;
  border: 0;
  padding: 12px 0;
  margin-bottom: -1px;
  font-family: var(--font-sans);
  font-size: var(--text-body-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out);
}

.tab:hover {
  color: var(--color-text);
}

.tab--active {
  color: var(--color-text);
  border-bottom-color: var(--color-accent);
}

.tabs--mono .tab {
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
}

/* -----------------------------------------------------------------------------
   Chips
   ----------------------------------------------------------------------------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 24px;
  padding: 0 10px;
  border-radius: var(--radius-pill);
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  font-weight: 500;
}

.chip--ink {
  background: var(--color-bg);
  color: var(--color-text);
  border: var(--border-hairline);
}

.chip--signal {
  background: var(--color-signal);
  color: var(--color-ink);
}

/* -----------------------------------------------------------------------------
   Schematic Data Panel — signature element
   ----------------------------------------------------------------------------- */
.data-panel {
  background: var(--color-surface);
  border: var(--border-hairline);
  border-radius: var(--radius-4);
  padding: var(--space-6);
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-6);
  align-items: stretch;
}

.data-panel__header {
  grid-column: 1 / -1;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-2);
}

.data-panel__title {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
}

.data-panel__chart,
.data-panel__radial {
  position: relative;
  border: var(--border-hairline);
  border-radius: var(--radius-3);
  padding: var(--space-4);
  background: var(--color-bg);
  min-height: 200px;
}

.data-panel__axis {
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.data-panel svg {
  width: 100%;
  height: 100%;
  display: block;
}

.schema-stroke {
  stroke: var(--color-border);
  stroke-width: 1;
  fill: none;
}

.schema-dashed {
  stroke: var(--color-border);
  stroke-width: 1;
  stroke-dasharray: 2 2;
  fill: none;
}

.schema-ink {
  stroke: var(--color-ink);
  stroke-width: 1;
  fill: none;
}

.schema-active {
  stroke: var(--color-accent);
  stroke-width: 1.5;
  fill: none;
}

.schema-mark {
  fill: var(--color-accent);
  stroke: none;
}

/* -----------------------------------------------------------------------------
   Swatch (for previews/specimens)
   ----------------------------------------------------------------------------- */
.swatch {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.swatch__chip {
  height: 88px;
  border: var(--border-hairline);
  border-radius: var(--radius-3);
}

.swatch__meta {
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

/* -----------------------------------------------------------------------------
   Section frame — schematic specimen container
   ----------------------------------------------------------------------------- */
.frame {
  position: relative;
  border: var(--border-hairline);
  border-radius: var(--radius-4);
  padding: var(--space-7);
  background: var(--color-bg);
}

.frame__index {
  position: absolute;
  top: var(--space-4);
  left: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* -----------------------------------------------------------------------------
   Utilities
   ----------------------------------------------------------------------------- */
.icon {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 1.5;
  fill: none;
  flex-shrink: 0;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}