/*
 * Japanese learning-course theme built on the Digital Agency Design System
 * (DADS) shared components used across the rest of the site
 * (komura_soft_single_page.css). The class inventory is unchanged so the
 * course content markup and learning-course.js keep working; only the
 * visual language moved to the DADS tokens/components.
 *
 * The en/ko/zh-TW courses load their own copy of this file under their
 * locale directory, so this file affects the Japanese pages only.
 */

:root {
  /* DADS design tokens (same values as komura_soft_single_page.css) */
  --color-primitive-blue-50: #e8f1fe;
  --color-primitive-blue-100: #d9e6ff;
  --color-primitive-blue-200: #c5d7fb;
  --color-primitive-blue-300: #9db7f9;
  --color-primitive-blue-900: #0017c1;
  --color-primitive-blue-1000: #00118f;
  --color-primitive-blue-1200: #000060;
  --color-primitive-yellow-300: #ffd43d;
  --color-neutral-white: #ffffff;
  --color-neutral-black: #000000;
  --color-neutral-solid-gray-50: #f2f2f2;
  --color-neutral-solid-gray-100: #e6e6e6;
  --color-neutral-solid-gray-200: #cccccc;
  --color-neutral-solid-gray-300: #b3b3b3;
  --color-neutral-solid-gray-420: #949494;
  --color-neutral-solid-gray-536: #767676;
  --color-neutral-solid-gray-800: #333333;
  --color-neutral-solid-gray-900: #1a1a1a;
  --font-family-sans: 'Noto Sans JP', 'Segoe UI', 'Hiragino Sans', 'Meiryo', sans-serif;

  /* Legacy learning-theme variables, remapped onto the DADS tokens so the
     course-specific markup and learning-course.css pick them up as-is. */
  --bg: var(--color-neutral-white);
  --panel: var(--color-neutral-white);
  --panel-alt: var(--color-neutral-solid-gray-50);
  --text: var(--color-neutral-solid-gray-900);
  --muted: var(--color-neutral-solid-gray-536);
  --border: var(--color-neutral-solid-gray-200);
  --border-strong: var(--color-neutral-solid-gray-420);
  --accent: var(--color-primitive-blue-900);
  --accent-soft: var(--color-primitive-blue-50);
  --success: #197a4b;
  --warning: #b65200;
  --danger: #ec0000;
  --shadow: none;
  --radius: 1rem;
  --radius-sm: 0.5rem;
  --max-width: 1200px;
  --line: 1.8;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font-family-sans);
  line-height: var(--line);
  letter-spacing: 0.02em;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primitive-blue-1000);
  text-decoration: underline;
  text-decoration-thickness: 0.0625rem;
  text-underline-offset: 0.1875rem;
}

a:hover {
  color: var(--color-primitive-blue-1200);
  text-decoration-thickness: 0.1875rem;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
  outline: 0.25rem solid var(--color-neutral-black);
  outline-offset: 0.125rem;
  box-shadow: 0 0 0 0.125rem var(--color-primitive-yellow-300);
}

code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

code {
  background: var(--color-neutral-solid-gray-50);
  color: var(--color-neutral-solid-gray-900);
  border: 1px solid var(--color-neutral-solid-gray-200);
  border-radius: 0.25rem;
  padding: 0.1rem 0.4rem;
  font-size: 0.95em;
}

pre {
  background: var(--color-neutral-solid-gray-900);
  color: var(--color-neutral-solid-gray-50);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  overflow: auto;
  line-height: 1.65;
}

pre code {
  background: transparent;
  color: inherit;
  border: none;
  padding: 0;
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  letter-spacing: 0.02em;
  margin: 0 0 0.7em;
}

h1 {
  font-size: clamp(2rem, 3vw + 1rem, 2.75rem);
}

h2 {
  font-size: clamp(1.35rem, 2.2vw, 1.75rem);
  margin-top: 1.8em;
}

h3 {
  font-size: 1.125rem;
  margin-top: 1.4em;
}

p,
ul,
ol,
blockquote,
table,
figure {
  margin: 0 0 1.1rem;
}

ul,
ol {
  padding-left: 1.5rem;
}

li + li {
  margin-top: 0.35rem;
}

blockquote {
  margin: 1.2rem 0;
  padding: 1rem 1.2rem;
  border-left: 4px solid var(--color-primitive-blue-900);
  background: var(--color-primitive-blue-50);
  border-radius: 0;
  color: var(--color-neutral-solid-gray-800);
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-neutral-white);
  border: 1px solid var(--border);
}

th,
td {
  padding: 0.75rem 0.875rem;
  text-align: left;
  vertical-align: top;
  border: 1px solid var(--border);
}

th {
  background: var(--color-neutral-solid-gray-50);
  font-weight: 700;
}

.table-wrap {
  overflow-x: auto;
}

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

.small {
  font-size: 0.95rem;
}

/* ------------------------------------------------------------------ */
/* Digital Agency design-system shared components                      */
/* (same markup contract as komura_soft_single_page.css)               */
/* ------------------------------------------------------------------ */

.dads-button {
  --button-color: var(--color-primitive-blue-900);
  --button-hover-color: var(--color-primitive-blue-1000);
  --button-active-color: var(--color-primitive-blue-1200);
  --button-outline-hover-bg-color: var(--color-primitive-blue-200);
  --button-outline-active-bg-color: var(--color-primitive-blue-300);
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  width: fit-content;
  max-width: 100%;
  min-height: 3.5rem;
  min-width: 8.5rem;
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
  font-family: var(--font-family-sans);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  text-decoration: none;
  text-underline-offset: 0.1875rem;
  cursor: pointer;
}

.dads-button[data-size="sm"] {
  min-height: 2.75rem;
  min-width: 6rem;
  padding: 0.5rem 0.875rem;
  font-size: 0.95rem;
}

.dads-button[data-type="solid-fill"] {
  border: 4px double transparent;
  background-color: var(--button-color);
  color: var(--color-neutral-white);
}

.dads-button[data-type="outline"] {
  border: 1px solid currentColor;
  background-color: var(--color-neutral-white);
  color: var(--button-color);
}

@media (hover: hover) {
  .dads-button[data-type="solid-fill"]:hover {
    background-color: var(--button-hover-color);
    color: var(--color-neutral-white);
    text-decoration: underline;
    text-decoration-thickness: 0.0625rem;
  }

  .dads-button[data-type="outline"]:hover {
    background-color: var(--button-outline-hover-bg-color);
    color: var(--button-hover-color);
    text-decoration: underline;
    text-decoration-thickness: 0.0625rem;
  }
}

.dads-button[data-type="solid-fill"]:active {
  background-color: var(--button-active-color);
  color: var(--color-neutral-white);
}

.dads-button[data-type="outline"]:active {
  background-color: var(--button-outline-active-bg-color);
  color: var(--button-active-color);
}

.dads-button:focus-visible,
.dads-card--link:focus-visible {
  outline: 0.25rem solid var(--color-neutral-black);
  outline-offset: 0.125rem;
  box-shadow: 0 0 0 0.125rem var(--color-primitive-yellow-300);
}

.dads-button[hidden] {
  display: none;
}

.dads-button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.dads-card {
  position: relative;
  z-index: 0;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
  min-width: 0;
  border: 1px solid var(--color-neutral-solid-gray-420);
  border-radius: 1rem;
  background-color: var(--color-neutral-white);
  color: var(--color-neutral-solid-gray-900);
  font-family: var(--font-family-sans);
  text-decoration: none;
  overflow-wrap: anywhere;
}

.dads-card__main {
  display: grid;
  align-content: start;
  row-gap: 0.75rem;
  min-height: 100%;
  padding: 1rem 1.5rem;
}

.dads-card__title {
  margin: 0;
  color: var(--color-neutral-solid-gray-900);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.02em;
  overflow-wrap: anywhere;
}

a.dads-card--link .dads-card__title {
  text-decoration: underline;
  text-decoration-thickness: 0.0625rem;
  text-underline-offset: 0.1875rem;
}

@media (hover: hover) {
  a.dads-card--link:hover .dads-card__title {
    color: var(--color-primitive-blue-1000);
    text-decoration-thickness: 0.1875rem;
  }
}

.dads-card__body {
  margin: 0;
  color: var(--color-neutral-solid-gray-800);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.7;
  letter-spacing: 0.02em;
  overflow-wrap: anywhere;
}

.dads-link {
  color: var(--color-primitive-blue-1000);
  text-decoration: underline;
  text-decoration-thickness: 0.0625rem;
  text-underline-offset: 0.1875rem;
}

.dads-link:hover {
  color: var(--color-primitive-blue-1200);
  text-decoration-thickness: 0.1875rem;
}

/* ------------------------------------------------------------------ */
/* Learning chrome and content classes, re-skinned on the DADS tokens  */
/* ------------------------------------------------------------------ */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.2rem 0.6rem;
  border-radius: 0.25rem;
  background: var(--color-primitive-blue-50);
  color: var(--color-primitive-blue-1000);
  font-weight: 700;
  font-size: 0.84rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1rem 0 1.4rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.6rem;
  border-radius: 0.25rem;
  border: 1px solid var(--color-primitive-blue-200);
  background: var(--color-primitive-blue-50);
  color: var(--color-primitive-blue-1000);
  font-weight: 600;
  font-size: 0.88rem;
}

.shell-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--color-neutral-solid-gray-200);
}

.shell-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.95rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem 1.2rem;
}

.brand {
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
}

.brand:hover {
  color: var(--text);
  text-decoration: underline;
  text-decoration-thickness: 0.0625rem;
}

.breadcrumbs {
  font-size: 0.92rem;
  color: var(--muted);
}

.breadcrumbs a {
  color: var(--color-primitive-blue-1000);
}

.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.8rem 1.25rem 3rem;
  display: grid;
  grid-template-columns: minmax(260px, 280px) minmax(0, 1fr);
  gap: 1.6rem 2rem;
  align-items: start;
}

.page--single {
  grid-template-columns: 1fr;
}

.sidebar {
  position: sticky;
  top: 5.4rem;
}

.card,
.sidebar-card,
.lesson-card,
.figure-card,
.quiz-card,
.sim-card,
.course-card,
.notice-card,
.metric-card {
  background: var(--panel);
  border: 1px solid var(--color-neutral-solid-gray-420);
  border-radius: var(--radius);
  box-shadow: none;
}

.sidebar-card,
.lesson-card,
.figure-card,
.quiz-card,
.sim-card,
.notice-card,
.metric-card {
  padding: 1.25rem;
}

.lesson-card + .lesson-card {
  margin-top: 1rem;
}

.lesson {
  min-width: 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 1.25rem;
  align-items: stretch;
}

.hero-copy,
.hero-visual {
  background: var(--color-neutral-white);
  border: 1px solid var(--color-neutral-solid-gray-420);
  border-radius: var(--radius);
  box-shadow: none;
  padding: 1.5rem;
}

.hero-copy h1 {
  margin-bottom: 0.3rem;
}

.lead {
  font-size: 1.08rem;
  color: var(--color-neutral-solid-gray-800);
  margin-bottom: 1rem;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 1rem 0 1.2rem;
}

.metric-card {
  padding: 0.95rem;
  border-color: var(--color-neutral-solid-gray-200);
  border-radius: var(--radius-sm);
}

.metric-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.25rem;
}

.metric-value {
  font-size: 1rem;
  font-weight: 700;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

/* Legacy `.button` markup (quiz grade / simulator controls) styled as the
   DADS button: solid-fill by default, outline for `.button--ghost`. */
.button {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  min-height: 2.75rem;
  border: 4px double transparent;
  background: var(--color-primitive-blue-900);
  color: var(--color-neutral-white);
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-family: var(--font-family-sans);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  line-height: 1;
  text-decoration: none;
  box-shadow: none;
}

.button:hover {
  background: var(--color-primitive-blue-1000);
  color: var(--color-neutral-white);
  text-decoration: underline;
  text-decoration-thickness: 0.0625rem;
  filter: none;
}

.button:active {
  background: var(--color-primitive-blue-1200);
}

.button--ghost {
  background: var(--color-neutral-white);
  color: var(--color-primitive-blue-900);
  border: 1px solid currentColor;
  box-shadow: none;
}

.button--ghost:hover {
  background: var(--color-primitive-blue-200);
  color: var(--color-primitive-blue-1000);
}

.button--ghost:active {
  background: var(--color-primitive-blue-300);
  color: var(--color-primitive-blue-1200);
}

.button[hidden] {
  display: none !important;
}

.course-nav {
  display: grid;
  gap: 0.45rem;
  margin-top: 1rem;
}

.course-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.8rem 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--color-neutral-white);
  color: var(--text);
  border: 1px solid var(--color-neutral-solid-gray-200);
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.course-nav-link:hover {
  color: var(--text);
  text-decoration: underline;
  text-decoration-thickness: 0.0625rem;
  background: var(--color-primitive-blue-50);
  border-color: var(--color-primitive-blue-300);
}

.course-nav-link .course-nav-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  font-size: 0.78rem;
  color: var(--muted);
  white-space: nowrap;
}

.course-nav-link.is-current {
  background: var(--color-primitive-blue-900);
  color: var(--color-neutral-white);
  border-color: var(--color-primitive-blue-900);
}

.course-nav-link.is-current .course-nav-meta {
  color: var(--color-primitive-blue-100);
}

.course-nav-link.is-visited:not(.is-current) {
  background: var(--color-primitive-blue-50);
}

.course-nav-link.is-visited .course-nav-meta::before {
  content: "閲覧済み";
  color: var(--success);
  font-weight: 700;
}

.progress-wrap {
  margin-top: 1rem;
}

.progress-bar {
  height: 10px;
  border-radius: 999px;
  background: var(--color-neutral-solid-gray-100);
  overflow: hidden;
}

.progress-fill {
  display: block;
  height: 100%;
  width: 0%;
  border-radius: inherit;
  background: var(--color-primitive-blue-900);
  transition: width 0.25s ease;
}

.progress-text {
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.lesson-header {
  margin-bottom: 1rem;
}

.chapter-kicker {
  display: block;
  color: var(--color-primitive-blue-1000);
  font-weight: 800;
  margin-bottom: 0.3rem;
}

.lesson-summary {
  font-size: 1.05rem;
  color: var(--color-neutral-solid-gray-800);
  margin-bottom: 1rem;
}

.figure-card {
  overflow: hidden;
}

.figure-card img {
  display: block;
  width: 100%;
  border-radius: var(--radius-sm);
  background: var(--color-neutral-white);
}

.figure-caption {
  font-size: 0.92rem;
  color: var(--muted);
  margin-top: 0.8rem;
}

/* SO101 inline SVG figures — scoped to <svg> context so HTML elements keep
   their own .figure-caption / .figure-label styling. */
svg.figure-svg {
  display: block;
  width: 100%;
  height: auto;
}
svg .figure-title { font-size: 22px; fill: #163047; font-weight: 700; }
svg .figure-caption { font-size: 14px; fill: #496277; }
svg .figure-label { font-size: 14px; fill: #163047; font-weight: 600; }
svg .figure-mini { font-size: 13px; fill: #163047; }
svg .figure-note { font-size: 13px; fill: #496277; }
svg .sensor-dot { fill: #0b79b7; opacity: 0.95; }
svg .target-block { fill: #2f516b; opacity: 0.95; }
svg .arrow-light { stroke: #f0b400; stroke-width: 6; stroke-linecap: round; fill: none; }
svg .arrow-radio { stroke: #8a73d6; stroke-width: 6; stroke-linecap: round; fill: none; }
svg .arrow-sound { stroke: #0b79b7; stroke-width: 6; stroke-linecap: round; fill: none; }
svg .arrow-echo { stroke: #d05488; stroke-width: 6; stroke-linecap: round; fill: none; }
svg .dim-line { stroke: #456a86; stroke-width: 2; fill: none; }
svg .timeline { stroke: #456a86; stroke-width: 3; stroke-linecap: round; fill: none; }
svg .timeline-node { fill: #0b79b7; }
svg .panel-box { fill: #f7fbfe; stroke: #d7e4ee; stroke-width: 2; }
svg .panel-title { font-size: 18px; fill: #163047; font-weight: 700; }
svg .axis-line { stroke: #456a86; stroke-width: 2.5; stroke-linecap: round; fill: none; }
svg .wavefront { fill: none; stroke: #0b79b7; stroke-width: 3; stroke-dasharray: 10 8; }
svg .bar-bg { fill: #f1f6fb; stroke: #d7e4ee; }
svg .bar-sl { fill: #8bd0ff; }
svg .bar-rl { fill: #1b80b8; }
svg .bar-nl { fill: #b5cadd; }

/* PD101 (Poisson distribution) hero SVG figures */
svg.hero-svg {
  width: 100%;
  height: auto;
  display: block;
}
svg.hero-svg rect,
svg.hero-svg circle {
  fill: rgba(0, 23, 193, 0.10);
  stroke: rgba(0, 23, 193, 0.45);
  stroke-width: 2;
}
svg.hero-svg line,
svg.hero-svg path {
  stroke: rgba(0, 23, 193, 0.65);
  stroke-width: 2.4;
  fill: none;
}
svg.hero-svg marker path {
  stroke: none;
  fill: rgba(0, 23, 193, 0.85);
}
svg.hero-svg text {
  fill: #1a1a1a;
  font-size: 18px;
  font-family: system-ui, sans-serif;
  font-weight: 600;
}

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

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

.notice-card {
  border-left: 4px solid var(--color-primitive-blue-900);
  background: var(--color-primitive-blue-50);
}

.lesson-links {
  display: grid;
  gap: 0.8rem;
  margin-top: 1.1rem;
}

.lesson-link {
  display: block;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-neutral-solid-gray-420);
  background: var(--color-neutral-white);
  color: var(--text);
  text-decoration: none;
  box-shadow: none;
}

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

.lesson-link strong {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--color-primitive-blue-1000);
  text-decoration: underline;
  text-decoration-thickness: 0.0625rem;
  text-underline-offset: 0.1875rem;
}

.lesson-link:hover strong {
  text-decoration-thickness: 0.1875rem;
}

.course-list-grid {
  display: grid;
  gap: 1rem;
}

.course-card {
  padding: 1.25rem;
  color: var(--text);
  display: block;
  text-decoration: none;
}

.course-card:hover {
  border-color: var(--color-primitive-blue-900);
}

.course-card h2 {
  margin-top: 0.35rem;
  margin-bottom: 0;
}

.course-card p,
.course-card .course-meta,
.course-card .chapter-mini {
  display: none;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.8rem;
}

.footer-nav a {
  flex: 1;
  min-width: 230px;
  padding: 1rem 1.05rem;
  border: 1px solid var(--color-neutral-solid-gray-420);
  border-radius: var(--radius);
  background: var(--color-neutral-white);
  color: var(--text);
  text-decoration: none;
  box-shadow: none;
}

.footer-nav strong {
  display: block;
  margin-bottom: 0.15rem;
  color: var(--color-primitive-blue-1000);
  text-decoration: underline;
  text-decoration-thickness: 0.0625rem;
  text-underline-offset: 0.1875rem;
}

.footer-nav a:hover strong {
  color: var(--color-primitive-blue-1200);
  text-decoration-thickness: 0.1875rem;
}

.site-footer {
  max-width: var(--max-width);
  margin: 0 auto 3rem;
  padding: 0 1.25rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer .card {
  padding: 1rem 1.2rem;
}

.rule-table td:first-child,
.rule-table th:first-child {
  white-space: nowrap;
}

.rule-pill {
  display: inline-flex;
  align-items: center;
  border-radius: 0.25rem;
  padding: 0.2rem 0.55rem;
  font-size: 0.82rem;
  font-weight: 700;
  background: var(--color-primitive-blue-50);
  color: var(--color-primitive-blue-1000);
}

.sim-shell {
  display: grid;
  gap: 1rem;
}

.sim-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.control-group {
  background: var(--color-neutral-solid-gray-50);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

.control-label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  font-weight: 700;
  margin-bottom: 0.55rem;
}

.control-value {
  color: var(--color-primitive-blue-1000);
  font-size: 1.1rem;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--color-primitive-blue-900);
}

.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.preset-button {
  appearance: none;
  border: 1px solid currentColor;
  background: var(--color-neutral-white);
  color: var(--color-primitive-blue-900);
  border-radius: 0.5rem;
  padding: 0.45rem 0.8rem;
  cursor: pointer;
  font-family: var(--font-family-sans);
  font-weight: 600;
}

.preset-button:hover {
  background: var(--color-primitive-blue-200);
  color: var(--color-primitive-blue-1000);
}

.sim-output-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.1fr);
  gap: 1rem;
}

.readout-stack {
  display: grid;
  gap: 0.8rem;
}

.output-readout {
  background: var(--color-primitive-blue-50);
  border: 1px solid var(--color-primitive-blue-200);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

.output-main {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1;
  margin-bottom: 0.35rem;
}

.output-sub {
  color: var(--muted);
}

.compare-row {
  display: grid;
  gap: 0.75rem;
}

.compare-item {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--color-neutral-solid-gray-50);
  border: 1px solid var(--border);
}

.compare-item strong {
  color: var(--text);
}

.svg-panel {
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--color-neutral-white);
  overflow: hidden;
}

.rule-list {
  display: grid;
  gap: 0.7rem;
}

.rule-row {
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--color-neutral-white);
}

.rule-row strong {
  display: block;
  margin-bottom: 0.35rem;
}

.rule-bar {
  height: 10px;
  border-radius: 999px;
  background: var(--color-neutral-solid-gray-100);
  overflow: hidden;
  margin-top: 0.55rem;
}

.rule-bar span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--color-primitive-blue-900);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1rem;
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.legend i {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 999px;
}

.legend .legend-fuzzy { background: #0017c1; }
.legend .legend-threshold { background: #767676; }
.legend .legend-agg { background: rgba(0, 23, 193, 0.16); border: 1px solid #9db7f9; }
.legend .legend-centroid { background: #b65200; }

.quiz-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.2rem;
}

.quiz-result {
  padding: 1rem 1.1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-primitive-blue-200);
  background: var(--color-primitive-blue-50);
  margin-bottom: 1rem;
}

.quiz-result strong {
  font-size: 1.05rem;
}

.quiz-list {
  display: grid;
  gap: 1rem;
}

.quiz-question {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--color-neutral-white);
  overflow: hidden;
}

.quiz-question-header {
  padding: 1rem 1.1rem 0;
}

.quiz-question-body {
  padding: 0 1.1rem 1.1rem;
}

.quiz-option {
  display: block;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--color-neutral-solid-gray-420);
  border-radius: var(--radius-sm);
  margin-top: 0.7rem;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.quiz-option:hover {
  background: var(--color-primitive-blue-50);
}

.quiz-option:focus-within {
  outline: 0.25rem solid var(--color-neutral-black);
  outline-offset: 0.125rem;
  box-shadow: 0 0 0 0.125rem var(--color-primitive-yellow-300);
}

.quiz-option input {
  margin-right: 0.55rem;
  accent-color: var(--color-primitive-blue-900);
}

.quiz-option.is-correct {
  border-color: var(--success);
  background: #e6f5ec;
}

.quiz-option.is-wrong {
  border-color: var(--danger);
  background: #fdeeee;
}

.quiz-feedback {
  margin-top: 0.8rem;
  padding: 0.85rem 0.95rem;
  border-radius: var(--radius-sm);
  background: var(--color-neutral-solid-gray-50);
  border: 1px solid var(--border);
}

.quiz-feedback.is-correct {
  border-color: var(--success);
  background: #e6f5ec;
}

.quiz-feedback.is-wrong {
  border-color: var(--danger);
  background: #fdeeee;
}

.kv-list {
  display: grid;
  gap: 0.8rem;
}

.kv-item {
  padding: 0.95rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--color-neutral-white);
}

.kv-item strong {
  display: block;
  margin-bottom: 0.25rem;
}

.callout-grid {
  display: grid;
  gap: 1rem;
}

.note-list {
  display: grid;
  gap: 0.8rem;
}

.note-item {
  display: grid;
  gap: 0.25rem;
  padding: 0.95rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--color-neutral-white);
  border: 1px solid var(--border);
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.pill-list span {
  display: inline-flex;
  padding: 0.25rem 0.6rem;
  border-radius: 0.25rem;
  background: var(--color-neutral-solid-gray-50);
  border: 1px solid var(--color-neutral-solid-gray-200);
  color: var(--color-neutral-solid-gray-800);
  font-size: 0.86rem;
  font-weight: 600;
}

.caption {
  font-size: 0.92rem;
  color: var(--muted);
}

.no-js {
  padding: 1rem 1.1rem;
  border-radius: var(--radius-sm);
  background: #fff4e5;
  border: 1px solid var(--warning);
  color: var(--warning);
}

@media (max-width: 1100px) {
  .metric-grid,
  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-grid,
  .sim-output-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 920px) {
  .page {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    order: 2;
  }

  .lesson {
    order: 1;
  }
}

@media (max-width: 720px) {
  .metric-grid,
  .grid-2,
  .sim-controls {
    grid-template-columns: 1fr;
  }

  .shell-inner {
    padding-inline: 1rem;
  }

  .page,
  .site-footer {
    padding-inline: 1rem;
  }

  .hero-copy,
  .hero-visual,
  .lesson-card,
  .figure-card,
  .sidebar-card,
  .quiz-card,
  .sim-card,
  .notice-card,
  .metric-card,
  .course-card {
    padding: 1rem;
  }
}

/* FC101 v2 additions */
.equation-grid {
  display: grid;
  gap: 0.9rem;
}

.equation-card {
  padding: 1rem 1.05rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--color-neutral-white);
}

.equation-card strong {
  display: block;
  margin-bottom: 0.3rem;
}

.table-note {
  font-size: 0.92rem;
  color: var(--muted);
  margin-top: 0.75rem;
}

.summary-table td code,
.summary-table th code {
  white-space: nowrap;
}

.practice-card {
  display: grid;
  gap: 1rem;
}

.practice-header {
  display: grid;
  gap: 0.55rem;
}

.practice-header h2 {
  margin: 0;
}

.practice-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.practice-meta span {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.6rem;
  border-radius: 0.25rem;
  background: var(--color-neutral-solid-gray-50);
  border: 1px solid var(--color-neutral-solid-gray-200);
  color: var(--color-neutral-solid-gray-800);
  font-size: 0.86rem;
  font-weight: 600;
}

.practice-question {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--color-neutral-white);
  overflow: hidden;
}

.practice-question-header {
  padding: 1rem 1.1rem 0;
}

.practice-question-body {
  padding: 0 1.1rem 1.1rem;
}

.practice-input-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.8rem;
}

.practice-input {
  width: min(260px, 100%);
  appearance: none;
  border: 1px solid var(--color-neutral-solid-gray-420);
  border-radius: 0.5rem;
  padding: 0.8rem 0.9rem;
  font-size: 1rem;
  font-family: var(--font-family-sans);
  background: var(--color-neutral-white);
  color: var(--text);
}

.practice-input:focus-visible {
  outline: 0.25rem solid var(--color-neutral-black);
  outline-offset: 0.125rem;
  box-shadow: 0 0 0 0.125rem var(--color-primitive-yellow-300);
}

.practice-input.is-correct {
  border-color: var(--success);
  background: #e6f5ec;
}

.practice-input.is-wrong {
  border-color: var(--danger);
  background: #fdeeee;
}

.practice-unit {
  color: var(--muted);
  font-weight: 600;
}

.practice-status {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 700;
}

.practice-status.is-passed {
  color: var(--success);
}

.practice-status.is-pending {
  color: var(--warning);
}

.snapshot-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.snapshot-item {
  padding: 0.85rem 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--color-neutral-white);
}

.snapshot-item strong {
  display: block;
  margin-bottom: 0.15rem;
}

.summary-mini-table td,
.summary-mini-table th {
  padding: 0.65rem 0.8rem;
  font-size: 0.94rem;
}

@media (max-width: 1100px) {
  .snapshot-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .snapshot-grid {
    grid-template-columns: 1fr;
  }
}

/* ------------------------------------------------------------------ */
/* DADS overrides for the shared mobile TOC drawer chrome              */
/* (learning-course.css loads after this file, so scope on the         */
/*  .dads-learning body class for higher specificity)                  */
/* ------------------------------------------------------------------ */

.dads-learning .mobile-toc-trigger {
  border: 4px double transparent;
  border-radius: 0.5rem;
  background: var(--color-primitive-blue-900);
  font-family: var(--font-family-sans);
  box-shadow: 0 4px 12px rgba(26, 26, 26, 0.2);
}

.dads-learning .mobile-toc-trigger:hover {
  background: var(--color-primitive-blue-1000);
}

.dads-learning .mobile-toc-trigger:focus-visible {
  outline: 0.25rem solid var(--color-neutral-black);
  outline-offset: 0.125rem;
  box-shadow: 0 0 0 0.125rem var(--color-primitive-yellow-300);
}

.dads-learning .mobile-toc-panel {
  border-radius: 1rem 1rem 0 0;
  border-top: 1px solid var(--color-neutral-solid-gray-200);
  box-shadow: 0 -14px 34px rgba(26, 26, 26, 0.18);
}

.dads-learning .mobile-toc-header {
  border-bottom-color: var(--color-neutral-solid-gray-200);
}

.dads-learning .mobile-toc-close {
  border: 1px solid currentColor;
  border-radius: 0.5rem;
  color: var(--color-primitive-blue-900);
  font-family: var(--font-family-sans);
}

.dads-learning .mobile-toc-close:hover {
  background: var(--color-primitive-blue-200);
  color: var(--color-primitive-blue-1000);
}