/*
 * Mathematics with Ash — Core Design System
 * Version 1.0 · September 2026
 *
 * The Worked Examples visual language, made reusable across the full site.
 * CSS custom properties are the source of truth. Components use the `mwa-`
 * prefix so the system can be introduced alongside the legacy `fw-` styles.
 */

/* --------------------------------------------------------------------------
   1. Foundations
   -------------------------------------------------------------------------- */

:root {
  color-scheme: light dark;

  /* Primitive palette — do not use primitives directly in components. */
  --mwa-navy-950: #071a30;
  --mwa-navy-900: #142b4a;
  --mwa-navy-700: #38506f;
  --mwa-navy-500: #68809c;
  --mwa-navy-200: #c8d9ed;
  --mwa-navy-100: #eaf3ff;
  --mwa-navy-50: #f8fbff;

  --mwa-amber-700: #a95b00;
  --mwa-amber-600: #d77b00;
  --mwa-amber-500: #ffb000;
  --mwa-amber-300: #ffcf62;
  --mwa-amber-100: #fff2cc;

  --mwa-teal-700: #0b7775;
  --mwa-teal-500: #10a7a1;
  --mwa-teal-300: #84e6dd;
  --mwa-teal-100: #ddf8f6;

  --mwa-magenta-700: #b93668;
  --mwa-magenta-500: #cc3f75;
  --mwa-magenta-300: #ff78aa;
  --mwa-magenta-100: #fbe5ed;

  --mwa-green-700: #147a4a;
  --mwa-green-100: #e2f5ea;
  --mwa-red-700: #aa2f46;
  --mwa-red-100: #fde8ec;
  --mwa-white: #ffffff;

  /* Semantic colour roles — use these in product code. */
  --mwa-bg-page: var(--mwa-navy-50);
  --mwa-bg-surface: var(--mwa-white);
  --mwa-bg-subtle: var(--mwa-navy-100);
  --mwa-bg-inverse: var(--mwa-navy-900);
  --mwa-bg-inverse-deep: var(--mwa-navy-950);
  --mwa-text: var(--mwa-navy-900);
  --mwa-text-muted: var(--mwa-navy-700);
  --mwa-text-faint: var(--mwa-navy-500);
  --mwa-text-inverse: #fff7df;
  --mwa-text-on-accent: var(--mwa-navy-900);
  --mwa-logo-bg: var(--mwa-navy-900);
  --mwa-logo-text: #fff7df;
  --mwa-border: var(--mwa-navy-200);
  --mwa-grid-line: rgba(69, 128, 184, 0.10);

  /* Accessible text roles derived from the brand hues. */
  --mwa-text-amber: var(--mwa-amber-700);
  --mwa-text-teal: var(--mwa-teal-700);
  --mwa-text-magenta: var(--mwa-magenta-700);
  --mwa-text-success: var(--mwa-green-700);
  --mwa-text-danger: var(--mwa-red-700);

  /* Functional accent roles. */
  --mwa-accent: var(--mwa-amber-500);
  --mwa-concept: var(--mwa-teal-500);
  --mwa-teaching: var(--mwa-magenta-500);
  --mwa-success: var(--mwa-green-700);
  --mwa-danger: var(--mwa-red-700);

  /* Type. The system intentionally uses dependable local font stacks. */
  --mwa-font-sans: Inter, ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mwa-font-serif: Georgia, "Times New Roman", serif;
  --mwa-font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --mwa-leading-tight: 1.12;
  --mwa-leading-title: 1.18;
  --mwa-leading-body: 1.6;

  --mwa-step--1: clamp(0.78rem, 0.76rem + 0.08vw, 0.84rem);
  --mwa-step-0: clamp(1rem, 0.98rem + 0.12vw, 1.06rem);
  --mwa-step-1: clamp(1.12rem, 1.04rem + 0.38vw, 1.32rem);
  --mwa-step-2: clamp(1.4rem, 1.23rem + 0.72vw, 1.85rem);
  --mwa-step-3: clamp(1.8rem, 1.48rem + 1.35vw, 2.7rem);
  --mwa-step-4: clamp(2.35rem, 1.72rem + 2.7vw, 4.15rem);
  --mwa-step-5: clamp(3rem, 1.95rem + 4.4vw, 5.9rem);

  /* 4px spacing foundation. */
  --mwa-space-1: 0.25rem;
  --mwa-space-2: 0.5rem;
  --mwa-space-3: 0.75rem;
  --mwa-space-4: 1rem;
  --mwa-space-5: 1.25rem;
  --mwa-space-6: 1.5rem;
  --mwa-space-8: 2rem;
  --mwa-space-10: 2.5rem;
  --mwa-space-12: 3rem;
  --mwa-space-16: 4rem;
  --mwa-space-20: 5rem;
  --mwa-space-24: 6rem;

  /* Shape and depth. */
  --mwa-radius-xs: 0.25rem;
  --mwa-radius-sm: 0.5rem;
  --mwa-radius-md: 0.75rem;
  --mwa-radius-lg: 1.125rem;
  --mwa-radius-xl: 1.5rem;
  --mwa-radius-pill: 999px;
  --mwa-shadow-soft: 0 18px 50px rgba(20, 43, 74, 0.10);
  --mwa-shadow-small: 0 8px 24px rgba(20, 43, 74, 0.09);
  --mwa-shadow-accent: 7px 7px 0 var(--mwa-accent);

  /* Layout and motion. */
  --mwa-content: 72rem;
  --mwa-reading: 44rem;
  --mwa-gutter: clamp(1rem, 4vw, 2rem);
  --mwa-duration-fast: 160ms;
  --mwa-duration: 240ms;
  --mwa-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

html[data-theme="dark"] {
  --mwa-bg-page: #091523;
  --mwa-bg-surface: #10233a;
  --mwa-bg-subtle: #172d48;
  --mwa-bg-inverse: #071a30;
  --mwa-bg-inverse-deep: #030f1d;
  --mwa-text: #eff6ff;
  --mwa-text-muted: #b9c9dd;
  --mwa-text-faint: #91a5bc;
  --mwa-text-inverse: #eff6ff;
  --mwa-text-on-accent: #071a30;
  --mwa-logo-bg: #eff6ff;
  --mwa-logo-text: #071a30;
  --mwa-border: #31506f;
  --mwa-grid-line: rgba(103, 164, 220, 0.09);
  --mwa-text-amber: #ffcf62;
  --mwa-text-teal: #84e6dd;
  --mwa-text-magenta: #ff78aa;
  --mwa-text-success: #68d39a;
  --mwa-text-danger: #ff8ba0;
  --mwa-accent: #ffc044;
  --mwa-concept: #4ad6cf;
  --mwa-teaching: #ff78aa;
  --mwa-success: #68d39a;
  --mwa-danger: #ff8ba0;
  --mwa-shadow-soft: 0 18px 50px rgba(0, 0, 0, 0.28);
  --mwa-shadow-small: 0 8px 24px rgba(0, 0, 0, 0.24);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --mwa-bg-page: #091523;
    --mwa-bg-surface: #10233a;
    --mwa-bg-subtle: #172d48;
    --mwa-bg-inverse: #071a30;
    --mwa-bg-inverse-deep: #030f1d;
    --mwa-text: #eff6ff;
    --mwa-text-muted: #b9c9dd;
    --mwa-text-faint: #91a5bc;
    --mwa-text-inverse: #eff6ff;
    --mwa-text-on-accent: #071a30;
    --mwa-logo-bg: #eff6ff;
    --mwa-logo-text: #071a30;
    --mwa-border: #31506f;
    --mwa-grid-line: rgba(103, 164, 220, 0.09);
    --mwa-text-amber: #ffcf62;
    --mwa-text-teal: #84e6dd;
    --mwa-text-magenta: #ff78aa;
    --mwa-text-success: #68d39a;
    --mwa-text-danger: #ff8ba0;
    --mwa-accent: #ffc044;
    --mwa-concept: #4ad6cf;
    --mwa-teaching: #ff78aa;
    --mwa-success: #68d39a;
    --mwa-danger: #ff8ba0;
    --mwa-shadow-soft: 0 18px 50px rgba(0, 0, 0, 0.28);
    --mwa-shadow-small: 0 8px 24px rgba(0, 0, 0, 0.24);
  }
}

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

html {
  scroll-behavior: smooth;
}

body.mwa-page {
  min-width: 20rem;
  margin: 0;
  color: var(--mwa-text);
  background-color: var(--mwa-bg-page);
  background-image:
    linear-gradient(var(--mwa-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--mwa-grid-line) 1px, transparent 1px);
  background-size: 1.75rem 1.75rem;
  font-family: var(--mwa-font-sans);
  font-size: var(--mwa-step-0);
  line-height: var(--mwa-leading-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.mwa-page[data-grid="false"] {
  background-image: none;
}

body.mwa-page :where(button, input, select, textarea) {
  font: inherit;
}

body.mwa-page :where(button, summary) {
  cursor: pointer;
}

body.mwa-page :where(img, svg) {
  max-width: 100%;
}

body.mwa-page :where(a) {
  color: inherit;
}

body.mwa-page :where(a, button, input, select, textarea, summary):focus-visible {
  outline: 3px solid var(--mwa-accent);
  outline-offset: 3px;
}

body.mwa-page ::selection {
  color: var(--mwa-text-on-accent);
  background: var(--mwa-accent);
}

/* --------------------------------------------------------------------------
   2. Layout primitives
   -------------------------------------------------------------------------- */

.mwa-container {
  width: min(var(--mwa-content), calc(100% - (2 * var(--mwa-gutter))));
  margin-inline: auto;
}

.mwa-reading-width {
  max-width: var(--mwa-reading);
}

.mwa-section {
  padding-block: clamp(3.5rem, 7vw, 6rem);
  scroll-margin-top: 6rem;
}

.mwa-section--compact {
  padding-block: clamp(2.25rem, 5vw, 4rem);
}

.mwa-section--surface {
  border-block: 1px solid var(--mwa-border);
  background: color-mix(in srgb, var(--mwa-bg-surface) 88%, transparent);
}

.mwa-stack {
  display: flex;
  flex-direction: column;
  gap: var(--mwa-stack-gap, var(--mwa-space-6));
}

.mwa-cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--mwa-cluster-gap, var(--mwa-space-3));
}

.mwa-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  gap: var(--mwa-grid-gap, var(--mwa-space-5));
}

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

.mwa-split {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(17rem, 0.85fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}

/* --------------------------------------------------------------------------
   3. Typography
   -------------------------------------------------------------------------- */

.mwa-display,
.mwa-title,
.mwa-heading {
  margin: 0;
  color: var(--mwa-text);
  letter-spacing: -0.035em;
}

.mwa-display,
.mwa-title {
  font-family: var(--mwa-font-serif);
  font-weight: 700;
}

.mwa-display {
  max-width: 12ch;
  font-size: var(--mwa-step-5);
  line-height: 0.98;
}

.mwa-title {
  font-size: var(--mwa-step-4);
  line-height: var(--mwa-leading-tight);
}

.mwa-heading {
  font-size: var(--mwa-step-2);
  line-height: var(--mwa-leading-title);
}

.mwa-subheading {
  margin: 0;
  font-size: var(--mwa-step-1);
  line-height: 1.3;
}

.mwa-lede {
  max-width: 42rem;
  margin: var(--mwa-space-4) 0 0;
  color: var(--mwa-text-muted);
  font-size: var(--mwa-step-1);
  line-height: 1.55;
}

.mwa-body,
.mwa-caption {
  color: var(--mwa-text-muted);
}

.mwa-caption {
  font-size: var(--mwa-step--1);
}

.mwa-eyebrow {
  display: inline-block;
  margin: 0 0 var(--mwa-space-2);
  color: var(--mwa-text-amber);
  font-size: var(--mwa-step--1);
  font-weight: 800;
  letter-spacing: 0.13em;
  line-height: 1.4;
  text-transform: uppercase;
}

.mwa-eyebrow--teaching {
  color: var(--mwa-text-magenta);
}

.mwa-eyebrow--concept {
  color: var(--mwa-text-teal);
}

.mwa-equation-text {
  font-family: var(--mwa-font-serif);
  font-variant-numeric: lining-nums tabular-nums;
}

.mwa-link {
  color: var(--mwa-text);
  font-weight: 750;
  text-decoration-color: var(--mwa-accent);
  text-decoration-thickness: 0.14em;
  text-underline-offset: 0.2em;
}

.mwa-link:hover {
  color: var(--mwa-text-amber);
}

/* --------------------------------------------------------------------------
   4. Navigation and identity
   -------------------------------------------------------------------------- */

.mwa-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--mwa-border);
  background: color-mix(in srgb, var(--mwa-bg-page) 91%, transparent);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.mwa-header__inner {
  min-height: 4.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--mwa-space-5);
}

.mwa-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--mwa-space-3);
  color: var(--mwa-text);
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.mwa-logo__mark {
  width: 2.25rem;
  height: 2.25rem;
  display: grid;
  flex: none;
  place-items: center;
  border-radius: 0.625rem 0.625rem 0.625rem 0.2rem;
  color: var(--mwa-logo-text);
  background: var(--mwa-logo-bg);
  box-shadow: 4px 4px 0 var(--mwa-amber-500);
  font-family: var(--mwa-font-serif);
  font-weight: 700;
  line-height: 1;
}

.mwa-nav {
  display: flex;
  align-items: center;
  gap: var(--mwa-space-1);
}

.mwa-nav__link,
.mwa-nav__action {
  min-height: 2.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.45rem 0.8rem;
  border-radius: var(--mwa-radius-pill);
  color: var(--mwa-text-muted);
  font-size: 0.94rem;
  font-weight: 750;
  text-decoration: none;
  transition:
    color var(--mwa-duration-fast) var(--mwa-ease),
    background var(--mwa-duration-fast) var(--mwa-ease);
}

.mwa-nav__link:hover,
.mwa-nav__link[aria-current="page"] {
  color: var(--mwa-text-inverse);
  background: var(--mwa-bg-inverse);
}

.mwa-nav__action {
  border: 1px solid var(--mwa-border);
  background: var(--mwa-bg-surface);
}

.mwa-breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--mwa-space-2);
  margin: 0;
  padding: 0;
  color: var(--mwa-text-muted);
  font-size: var(--mwa-step--1);
  list-style: none;
}

.mwa-breadcrumbs li + li::before {
  content: "›";
  margin-right: var(--mwa-space-2);
  color: var(--mwa-text-amber);
}

.mwa-breadcrumbs a {
  text-underline-offset: 0.2em;
}

/* --------------------------------------------------------------------------
   5. Actions and controls
   -------------------------------------------------------------------------- */

.mwa-button {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--mwa-space-2);
  padding: 0.65rem 1.05rem;
  border: 1px solid var(--mwa-text);
  border-radius: 0.625rem;
  color: var(--mwa-text);
  background: transparent;
  font-weight: 800;
  line-height: 1.2;
  text-decoration: none;
  transition:
    transform var(--mwa-duration-fast) var(--mwa-ease),
    box-shadow var(--mwa-duration-fast) var(--mwa-ease),
    background var(--mwa-duration-fast) var(--mwa-ease);
}

.mwa-button:hover {
  transform: translateY(-2px);
}

.mwa-button:active {
  transform: translateY(0);
}

.mwa-button:disabled,
.mwa-button[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.42;
  transform: none;
}

.mwa-button--primary {
  color: var(--mwa-text-inverse);
  background: var(--mwa-bg-inverse);
}

.mwa-button--accent {
  color: var(--mwa-text-on-accent);
  background: var(--mwa-accent);
  box-shadow: 4px 4px 0 var(--mwa-text);
}

.mwa-button--accent:hover {
  box-shadow: 6px 6px 0 var(--mwa-text);
}

.mwa-button--quiet {
  border-color: var(--mwa-border);
  background: var(--mwa-bg-surface);
}

.mwa-button--small {
  min-height: 2.35rem;
  padding: 0.5rem 0.8rem;
  font-size: var(--mwa-step--1);
}

.mwa-field {
  display: grid;
  gap: var(--mwa-space-2);
}

.mwa-label {
  color: var(--mwa-text-muted);
  font-size: var(--mwa-step--1);
  font-weight: 800;
}

.mwa-input,
.mwa-select,
.mwa-textarea {
  width: 100%;
  min-height: 3rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--mwa-border);
  border-radius: 0.6rem;
  color: var(--mwa-text);
  background: var(--mwa-bg-surface);
  font-weight: 650;
  transition:
    border-color var(--mwa-duration-fast) var(--mwa-ease),
    box-shadow var(--mwa-duration-fast) var(--mwa-ease);
}

.mwa-input:hover,
.mwa-select:hover,
.mwa-textarea:hover {
  border-color: var(--mwa-text-muted);
}

.mwa-input:focus,
.mwa-select:focus,
.mwa-textarea:focus {
  border-color: var(--mwa-concept);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--mwa-concept) 20%, transparent);
}

.mwa-hint {
  margin: 0;
  color: var(--mwa-text-faint);
  font-size: var(--mwa-step--1);
}

.mwa-error {
  margin: 0;
  color: var(--mwa-text-danger);
  font-size: var(--mwa-step--1);
  font-weight: 700;
}

/* --------------------------------------------------------------------------
   6. Surfaces and content components
   -------------------------------------------------------------------------- */

.mwa-panel,
.mwa-card {
  border: 1px solid var(--mwa-border);
  border-radius: var(--mwa-radius-lg);
  background: var(--mwa-bg-surface);
  box-shadow: var(--mwa-shadow-soft);
}

.mwa-card {
  padding: clamp(1.35rem, 3vw, 2rem);
}

a.mwa-card {
  display: flex;
  flex-direction: column;
  color: inherit;
  text-decoration: none;
  transition:
    transform var(--mwa-duration-fast) var(--mwa-ease),
    border-color var(--mwa-duration-fast) var(--mwa-ease),
    box-shadow var(--mwa-duration-fast) var(--mwa-ease);
}

a.mwa-card:hover {
  transform: translateY(-3px);
  border-color: var(--mwa-text);
  box-shadow: 0 22px 54px rgba(20, 43, 74, 0.14);
}

.mwa-card--accent {
  border-color: var(--mwa-text);
  box-shadow: var(--mwa-shadow-accent);
}

.mwa-card--inverse {
  color: var(--mwa-text-inverse);
  border-color: color-mix(in srgb, var(--mwa-white) 22%, transparent);
  background: var(--mwa-bg-inverse);
  box-shadow: none;
}

.mwa-card--inverse :where(.mwa-heading, .mwa-subheading) {
  color: var(--mwa-text-inverse);
}

.mwa-card--inverse :where(.mwa-body, .mwa-caption) {
  color: color-mix(in srgb, var(--mwa-text-inverse) 76%, transparent);
}

.mwa-meta-card {
  min-width: 10rem;
  display: grid;
  gap: var(--mwa-space-1);
  padding: 0.85rem 1rem;
  border-radius: 0.875rem 0.875rem 0.25rem 0.875rem;
  color: var(--mwa-text-inverse);
  background: var(--mwa-bg-inverse);
  box-shadow: var(--mwa-shadow-accent);
}

.mwa-meta-card span {
  font-size: var(--mwa-step--1);
  opacity: 0.78;
}

.mwa-meta-card strong + span {
  margin-top: var(--mwa-space-1);
}

.mwa-tag {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 0.25rem 0.65rem;
  border-radius: var(--mwa-radius-pill);
  color: var(--mwa-text-magenta);
  background: var(--mwa-bg-subtle);
  font-size: 0.74rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  line-height: 1.5;
  text-transform: uppercase;
}

.mwa-tag--concept {
  color: var(--mwa-text-teal);
  background: color-mix(in srgb, var(--mwa-concept) 12%, var(--mwa-bg-surface));
}

.mwa-tag--accent {
  color: var(--mwa-text-amber);
  background: color-mix(in srgb, var(--mwa-accent) 18%, var(--mwa-bg-surface));
}

.mwa-equation {
  min-height: 4.5rem;
  display: flex;
  align-items: center;
  padding: 1rem 1.15rem;
  border-left: 5px solid var(--mwa-concept);
  border-radius: 0 var(--mwa-radius-md) var(--mwa-radius-md) 0;
  background: var(--mwa-bg-subtle);
  overflow-wrap: anywhere;
  font-family: var(--mwa-font-serif);
  font-size: clamp(1.3rem, 2.6vw, 2rem);
  font-variant-numeric: lining-nums tabular-nums;
  line-height: 1.35;
}

.mwa-equation--accent {
  border-left-color: var(--mwa-accent);
}

.mwa-equation mark {
  padding-inline: 0.12em;
  border-radius: var(--mwa-radius-xs);
  color: inherit;
  background: color-mix(in srgb, var(--mwa-accent) 38%, transparent);
}

.mwa-callout {
  padding: 1rem 1.1rem;
  border: 1px solid var(--mwa-border);
  border-left: 5px solid var(--mwa-concept);
  border-radius: 0 var(--mwa-radius-md) var(--mwa-radius-md) 0;
  color: var(--mwa-text-muted);
  background: var(--mwa-bg-surface);
}

.mwa-callout strong {
  color: var(--mwa-text);
}

.mwa-callout--teaching {
  border-left-color: var(--mwa-teaching);
}

.mwa-callout--warning {
  border-left-color: var(--mwa-accent);
  background: color-mix(in srgb, var(--mwa-accent) 9%, var(--mwa-bg-surface));
}

.mwa-callout--success {
  border-left-color: var(--mwa-success);
  background: color-mix(in srgb, var(--mwa-success) 8%, var(--mwa-bg-surface));
}

.mwa-callout--danger {
  border-left-color: var(--mwa-danger);
  background: color-mix(in srgb, var(--mwa-danger) 8%, var(--mwa-bg-surface));
}

.mwa-progress {
  height: 0.375rem;
  overflow: hidden;
  border-radius: var(--mwa-radius-pill);
  background: var(--mwa-bg-subtle);
}

.mwa-progress > span {
  display: block;
  width: var(--mwa-progress, 0%);
  height: 100%;
  border-radius: inherit;
  background: var(--mwa-accent);
  transition: width var(--mwa-duration) var(--mwa-ease);
}

.mwa-step-list {
  display: grid;
  gap: var(--mwa-space-3);
  margin: 0;
}

.mwa-step-list > div {
  display: grid;
  grid-template-columns: 1.8rem minmax(0, 1fr);
  gap: var(--mwa-space-3);
  align-items: start;
}

.mwa-step-list dt {
  width: 1.75rem;
  height: 1.75rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--mwa-text-inverse);
  background: var(--mwa-bg-inverse);
  font-size: 0.76rem;
  font-weight: 800;
}

.mwa-step-list dd {
  margin: 0;
  color: var(--mwa-text-muted);
}

.mwa-accordion {
  border: 1px solid var(--mwa-border);
  border-radius: var(--mwa-radius-md);
  background: var(--mwa-bg-surface);
}

.mwa-accordion summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--mwa-space-4);
  padding: 1rem 1.1rem;
  font-weight: 800;
  list-style: none;
}

.mwa-accordion summary::-webkit-details-marker {
  display: none;
}

.mwa-accordion summary::after {
  content: "+";
  color: var(--mwa-text-magenta);
  font-size: 1.25rem;
  line-height: 1;
}

.mwa-accordion[open] summary::after {
  content: "−";
}

.mwa-accordion__body {
  margin: 0;
  padding: 0 1.1rem 1rem;
  color: var(--mwa-text-muted);
}

.mwa-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--mwa-space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.mwa-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--mwa-border);
  border-radius: var(--mwa-radius-pill);
  color: var(--mwa-text-muted);
  background: var(--mwa-bg-surface);
  font-size: var(--mwa-step--1);
  font-weight: 750;
  text-decoration: none;
}

.mwa-chip:hover,
.mwa-chip[aria-current="true"],
.mwa-chip[aria-pressed="true"] {
  color: var(--mwa-text);
  border-color: var(--mwa-text);
}

/* --------------------------------------------------------------------------
   7. Data visualisation roles
   -------------------------------------------------------------------------- */

.mwa-data-frame {
  fill: var(--mwa-bg-surface);
  stroke: var(--mwa-border);
}

.mwa-data-grid {
  stroke: var(--mwa-border);
  stroke-width: 1;
  opacity: 0.64;
}

.mwa-data-axis {
  stroke: var(--mwa-text-muted);
  stroke-width: 1.5;
}

.mwa-data-series {
  fill: none;
  stroke: var(--mwa-concept);
  stroke-width: 4;
}

.mwa-data-point {
  fill: var(--mwa-teaching);
  stroke: var(--mwa-bg-surface);
  stroke-width: 3;
}

.mwa-data-highlight {
  fill: var(--mwa-accent);
  stroke: var(--mwa-bg-surface);
  stroke-width: 3;
}

/* --------------------------------------------------------------------------
   8. Footer and utilities
   -------------------------------------------------------------------------- */

.mwa-footer {
  padding-block: var(--mwa-space-10);
  border-top: 1px solid var(--mwa-border);
  color: var(--mwa-text-muted);
  font-size: var(--mwa-step--1);
}

.mwa-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--mwa-space-5);
}

.mwa-divider {
  height: 1px;
  border: 0;
  background: var(--mwa-border);
}

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

.mwa-text-muted { color: var(--mwa-text-muted); }
.mwa-text-amber { color: var(--mwa-text-amber); }
.mwa-text-teal { color: var(--mwa-text-teal); }
.mwa-text-magenta { color: var(--mwa-text-magenta); }
.mwa-surface { background: var(--mwa-bg-surface); }
.mwa-subtle { background: var(--mwa-bg-subtle); }

@media (max-width: 48rem) {
  .mwa-grid--2,
  .mwa-split {
    grid-template-columns: 1fr;
  }

  .mwa-header__inner {
    min-height: 4rem;
  }

  .mwa-logo__text {
    display: none;
  }

  .mwa-nav__link {
    padding-inline: 0.65rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

@media (forced-colors: active) {
  .mwa-logo__mark,
  .mwa-card,
  .mwa-panel,
  .mwa-meta-card,
  .mwa-button {
    box-shadow: none;
  }

  .mwa-progress > span {
    background: Highlight;
  }

  .mwa-equation,
  .mwa-callout {
    border-left-color: Highlight;
  }
}

@media print {
  body.mwa-page {
    color: #142b4a;
    background: #ffffff;
  }

  .mwa-header,
  .mwa-footer,
  .mwa-button {
    display: none !important;
  }

  .mwa-panel,
  .mwa-card {
    box-shadow: none;
    break-inside: avoid;
  }
}