/* Game Engine I · Week 05
   Contact becomes event; repeated tiles become a playable level. */

html.game-engine-week-five-root {
  scroll-behavior: auto;
}

body.course-game-engine-1.game-engine-week-five {
  --w5-amber: #bd6b20;
  --w5-amber-dark: #754015;
  --w5-amber-soft: #f2e1d0;
  --w5-lime: #9dcc22;
  --w5-lime-dark: #537015;
  --w5-lime-soft: #e7efc9;
  --w5-cyan: #2b93a1;
  --w5-cyan-dark: #1d6570;
  --w5-cyan-soft: #d8e9e8;
  --w5-coral: #d85e42;
  --w5-coral-dark: #883a28;
  --w5-coral-soft: #f2ddd6;
  --w5-violet: #6f70b5;
  --w5-violet-dark: #444574;
  --w5-violet-soft: #e4e2f1;
  --w5-charcoal: #11191b;
  --w5-code: #142124;
  --w5-code-line: #294248;
  --w5-code-ink: #ecf3ee;
  --w5-success: #567821;
  --w5-danger: #a14532;
  --w5-page-accent: var(--w5-amber);
  --w5-page-accent-strong: var(--w5-amber-dark);
  --w5-page-accent-soft: var(--w5-amber-soft);
  --w5-on-accent: #fff;
  --w5-rule: color-mix(in srgb, var(--w5-page-accent) 28%, var(--line));
  --w5-label-size: 12px;
  --w5-control-size: 12px;
  --w5-reading-small-size: 14px;
  --w5-ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --w5-radius-control: 4px;
  --w5-radius-panel: 8px;
  background: var(--bg);
}

body.course-game-engine-1.game-engine-week-five.week-five-period-two {
  --w5-page-accent: var(--w5-cyan);
  --w5-page-accent-strong: var(--w5-cyan-dark);
  --w5-page-accent-soft: var(--w5-cyan-soft);
}

body.course-game-engine-1.game-engine-week-five.week-five-period-three {
  --w5-page-accent: var(--w5-violet);
  --w5-page-accent-strong: var(--w5-violet-dark);
  --w5-page-accent-soft: var(--w5-violet-soft);
}

body.course-game-engine-1.game-engine-week-five [id] {
  scroll-margin-top: 88px;
}

body.course-game-engine-1.game-engine-week-five :is(a, button, input, select, summary):focus-visible {
  outline: 3px solid color-mix(in srgb, var(--w5-page-accent) 62%, transparent);
  outline-offset: 3px;
}

body.course-game-engine-1.game-engine-week-five .lesson-header {
  background: color-mix(in srgb, var(--paper) 96%, transparent);
}

body.course-game-engine-1.game-engine-week-five .lesson-breadcrumb,
body.course-game-engine-1.game-engine-week-five .lesson-sequence a,
body.course-game-engine-1.game-engine-week-five .week-five-hero .eyebrow,
body.course-game-engine-1.game-engine-week-five .toc-title {
  font-size: var(--w5-label-size);
}

/* Hero */

body.course-game-engine-1.game-engine-week-five .week-five-hero {
  background: var(--paper);
}

body.course-game-engine-1.game-engine-week-five .week-five-hero .hero-inner {
  min-height: min(620px, calc(100dvh - 58px));
  padding: clamp(48px, 8vh, 78px) 0;
  grid-template-columns: minmax(330px, .84fr) minmax(470px, 1.16fr);
  gap: clamp(40px, 5vw, 72px);
  align-items: center;
}

.week-five-hero-copy {
  min-width: 0;
}

body.course-game-engine-1.game-engine-week-five .week-five-hero h1 {
  max-width: 600px;
  margin-top: 13px;
  font-size: clamp(40px, 5vw, 64px);
  line-height: 1.02;
  letter-spacing: -.055em;
}

body.course-game-engine-1.game-engine-week-five .week-five-hero .lead {
  max-width: 560px;
  margin-top: 21px;
  font-size: 17px;
  line-height: 1.66;
}

.week-five-hero-actions {
  margin-top: 27px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.week-five-hero-action {
  min-height: 42px;
  padding: 11px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--w5-radius-control);
  display: inline-flex;
  align-items: center;
  color: var(--ink-strong);
  font: 650 var(--w5-control-size)/1 var(--mono);
  text-decoration: none;
  text-transform: uppercase;
}

.week-five-hero-action-primary {
  border-color: var(--w5-page-accent-strong);
  background: var(--w5-page-accent-strong);
  color: var(--w5-on-accent);
}

.week-five-lesson-facts {
  margin: 25px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  list-style: none;
}

.week-five-lesson-facts span,
.week-five-lesson-facts strong {
  display: block;
}

.week-five-lesson-facts span {
  color: var(--quiet);
  font: 600 var(--w5-label-size)/1.4 var(--mono);
  letter-spacing: .045em;
  text-transform: uppercase;
}

.week-five-lesson-facts strong {
  margin-top: 5px;
  color: var(--ink-strong);
  font: 650 var(--w5-label-size)/1.45 var(--mono);
}

.week-five-hero-visual {
  min-width: 0;
  margin: 0;
  border: 1px solid color-mix(in srgb, var(--w5-page-accent) 46%, var(--line));
  border-radius: var(--w5-radius-panel);
  overflow: hidden;
  background: var(--w5-charcoal);
  box-shadow: 0 28px 72px rgba(13, 31, 34, .2);
}

.week-five-hero-visual img {
  width: 100%;
  height: auto;
  border: 0;
  display: block;
}

.week-five-hero-visual figcaption {
  margin: 0;
  padding: 13px 16px 14px;
  border-top: 1px solid rgba(255, 255, 255, .13);
  background: var(--w5-code);
  color: rgba(237, 244, 239, .72);
  font-size: var(--w5-label-size);
  line-height: 1.55;
}

.week-five-hero-visual figcaption span {
  color: color-mix(in srgb, var(--w5-page-accent) 76%, #fff);
  font: 650 var(--w5-label-size)/1.3 var(--mono);
  letter-spacing: .04em;
}

/* Document */

body.course-game-engine-1.game-engine-week-five .layout,
body.course-game-engine-1.game-engine-week-five main.layout {
  padding: 78px 0 128px;
  grid-template-columns: minmax(0, 840px) minmax(220px, 250px);
  gap: clamp(54px, 7vw, 88px);
}

body.course-game-engine-1.game-engine-week-five .article {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

body.course-game-engine-1.game-engine-week-five .article :is(p, li, dd, td, th, summary, label) {
  word-break: keep-all;
  overflow-wrap: break-word;
}

.week-five-arrival {
  margin: 0 0 90px;
}

.arrival-heading {
  max-width: 730px;
}

.support-heading {
  margin: 0 0 11px;
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1.4 var(--mono);
  letter-spacing: .055em;
}

.arrival-heading h2,
.section-heading h2 {
  margin: 0;
  color: var(--ink-strong);
  font-size: clamp(29px, 3.6vw, 39px);
  font-weight: 770;
  letter-spacing: -.045em;
  line-height: 1.13;
}

.arrival-heading > p:last-child,
.section-heading > p:last-child {
  max-width: 690px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.68;
}

.arrival-list {
  margin: 31px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.arrival-list li {
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 15px;
  align-items: baseline;
}

.arrival-list li > span {
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1 var(--mono);
}

.arrival-list p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.arrival-list strong {
  color: var(--ink-strong);
}

.scope-line {
  margin: 0 0 96px;
  padding: 20px 22px;
  border: 1px solid var(--w5-rule);
  border-left: 4px solid var(--w5-page-accent);
  border-radius: var(--w5-radius-panel);
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 24px;
  background: color-mix(in srgb, var(--w5-page-accent-soft) 24%, var(--paper));
}

.scope-line span,
.scope-line strong {
  display: block;
}

.scope-line span {
  color: var(--quiet);
  font: 600 var(--w5-label-size)/1.4 var(--mono);
  text-transform: uppercase;
}

.scope-line strong {
  margin-top: 6px;
  color: var(--ink-strong);
  font-size: 14px;
}

.scope-line p {
  margin: 0;
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
  line-height: 1.65;
}

.week-five-section {
  margin-top: 102px;
}

.section-heading {
  max-width: 740px;
  margin-bottom: 31px;
}

.session-track {
  margin: 27px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.session-track li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 84px minmax(150px, .55fr) minmax(0, 1.45fr);
  gap: 17px;
  align-items: baseline;
}

.session-track time {
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1.3 var(--mono);
}

.session-track strong {
  color: var(--ink-strong);
  font-size: 14px;
}

.session-track p {
  margin: 0;
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
}

/* Cards and models */

.concept-grid,
.comparison-grid,
.requirement-grid,
.constraint-grid,
.submission-grid,
.source-grid,
.role-grid,
.prediction-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

:is(.concept-grid, .source-grid, .role-grid, .prediction-grid) {
  column-gap: 28px;
  row-gap: 0;
  border-bottom: 1px solid var(--line);
}

:is(.concept-card, .source-card, .role-grid article, .prediction-grid article) {
  min-width: 0;
  padding: 20px 0 22px;
  border: 0;
  border-top: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
}

:is(.comparison-card, .requirement-grid article, .constraint-grid article, .submission-grid article) {
  min-width: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--w5-radius-panel);
  background: var(--paper);
}

.concept-card > code,
.comparison-card > span,
.requirement-grid article > span,
.constraint-grid article > span,
.submission-grid article > span,
.source-label,
.role-grid article > span,
.prediction-grid article > span {
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1.4 var(--mono);
  letter-spacing: .035em;
  text-transform: uppercase;
}

.concept-card h3,
.comparison-card h3,
.requirement-grid h3,
.constraint-grid h3,
.submission-grid h3,
.source-card h3,
.role-grid h3,
.prediction-grid h3 {
  margin: 11px 0 7px;
  color: var(--ink-strong);
  font-size: 17px;
  letter-spacing: -.02em;
}

.concept-card p,
.comparison-card p,
.requirement-grid p,
.constraint-grid p,
.submission-grid p,
.source-card p,
.role-grid p,
.prediction-grid p {
  margin: 0;
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
  line-height: 1.62;
}

:is(
  .comparison-card[data-kind="collision"],
  .comparison-card[data-kind="trigger"],
  .comparison-card[data-kind="filter"]
) {
  border-top: 4px solid var(--w5-page-accent);
}

.requirement-grid article {
  min-height: 170px;
}

.constraint-grid article[data-state="required"] {
  border-top: 3px solid var(--w5-lime);
}

.constraint-grid article[data-state="forbidden"] {
  border-top: 3px solid var(--w5-coral);
  background: color-mix(in srgb, var(--w5-coral-soft) 24%, var(--paper));
}

.callout {
  margin: 27px 0;
  padding: 21px 23px;
  border: 1px solid var(--line);
  border-radius: var(--w5-radius-panel);
  background: var(--paper);
}

.callout-info {
  border-left: 4px solid var(--w5-cyan);
}

.callout-warning {
  border-left: 4px solid var(--w5-coral);
}

.callout-success {
  border-left: 4px solid var(--w5-lime);
}

.callout-title {
  margin: 0 0 7px !important;
  color: var(--ink-strong) !important;
  font-size: 14px !important;
  font-weight: 730;
}

.callout p,
.callout li {
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
  line-height: 1.65;
}

.callout :last-child {
  margin-bottom: 0;
}

/* Event and system diagrams */

.contact-model {
  margin: 28px 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.contact-model > div {
  position: relative;
  min-height: 142px;
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--paper);
}

.contact-model > div:not(:last-child)::after {
  content: "→";
  position: absolute;
  top: 19px;
  right: -13px;
  z-index: 2;
  width: 25px;
  height: 25px;
  border: 1px solid var(--w5-rule);
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--paper);
  color: var(--w5-page-accent-strong);
  font-size: var(--w5-label-size);
}

.contact-model span {
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1.4 var(--mono);
}

.contact-model strong {
  margin-top: 20px;
  display: block;
  color: var(--ink-strong);
  font-size: 15px;
}

.contact-model p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
  line-height: 1.55;
}

.event-timeline {
  margin: 28px 0;
  border: 1px solid var(--line);
  border-radius: var(--w5-radius-panel);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  overflow: hidden;
  background: var(--paper);
}

.event-timeline article {
  min-width: 0;
  padding: 22px;
}

.event-timeline article + article {
  border-left: 1px solid var(--line);
}

.event-timeline span {
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1.3 var(--mono);
  text-transform: uppercase;
}

.event-timeline strong {
  margin-top: 15px;
  display: block;
  color: var(--ink-strong);
  font-size: 15px;
}

.event-timeline p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
}

.system-stack {
  margin: 28px 0;
  border: 1px solid var(--w5-rule);
  border-radius: var(--w5-radius-panel);
  overflow: hidden;
  background: var(--paper);
}

.system-layer {
  padding: 20px 22px;
  display: grid;
  grid-template-columns: 120px minmax(150px, .6fr) minmax(0, 1.4fr);
  gap: 18px;
  align-items: baseline;
}

.system-layer + .system-layer {
  border-top: 1px solid var(--line);
}

.system-layer > span {
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1.4 var(--mono);
  text-transform: uppercase;
}

.system-layer > strong {
  color: var(--ink-strong);
  font-size: 14px;
}

.system-layer > p {
  margin: 0;
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
}

.matrix {
  margin: 28px 0;
  border-top: 1px solid var(--line-strong);
}

.matrix-row {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1.2fr repeat(3, .8fr);
  gap: 12px;
  align-items: center;
}

.matrix-row > * {
  min-width: 0;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.matrix-row > :first-child {
  color: var(--ink-strong);
  font-weight: 650;
  text-align: left;
}

.matrix-head > * {
  color: var(--quiet);
  font: 650 var(--w5-label-size)/1.3 var(--mono);
  text-transform: uppercase;
}

.matrix-status {
  width: 28px;
  height: 28px;
  margin: auto;
  border: 1px solid var(--line);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font: 700 var(--w5-label-size)/1 var(--mono);
}

.matrix-status[data-active="true"] {
  border-color: var(--w5-lime);
  background: color-mix(in srgb, var(--w5-lime-soft) 68%, var(--paper));
  color: var(--w5-success);
}

.matrix-status[data-active="false"] {
  color: var(--quiet);
}

/* Code and explanation */

.code-card {
  margin: 27px 0;
  border: 1px solid var(--w5-code-line);
  border-radius: var(--w5-radius-panel);
  overflow: hidden;
  background: var(--w5-code);
  box-shadow: 0 20px 50px rgba(13, 29, 32, .14);
}

.code-card-header {
  min-height: 48px;
  padding: 10px 12px 10px 18px;
  border-bottom: 1px solid rgba(222, 238, 235, .13);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.code-filename {
  color: #d7e5e1;
  font: 650 var(--w5-label-size)/1.35 var(--mono);
  letter-spacing: .03em;
  text-transform: uppercase;
}

.copy-code {
  min-height: 32px;
  padding: 7px 10px;
  border: 1px solid rgba(225, 240, 236, .25);
  border-radius: var(--w5-radius-control);
  background: transparent;
  color: #e3ece9;
  font: 650 var(--w5-control-size)/1 var(--mono);
  cursor: pointer;
}

.copy-code[data-copied="true"] {
  border-color: #b9e267;
  color: #cff59a;
}

.code-card pre {
  margin: 0;
  padding: 22px;
  overflow-x: auto;
  color: var(--w5-code-ink);
  font: 13px/1.75 var(--mono);
  tab-size: 4;
}

.code-card code {
  color: inherit;
  font-family: inherit;
}

.code-keyword { color: #88cfdd; }
.code-type { color: #d7cc77; }
.code-value { color: #f19a79; }
.code-method { color: #b9df91; }

.code-reading {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.code-reading li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(155px, .78fr) minmax(0, 1.22fr);
  gap: 22px;
}

.code-reading code {
  color: var(--w5-page-accent-strong);
  font-size: 12px;
  font-weight: 650;
}

.code-reading span {
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
}

.lecture-cues,
.debug-protocol {
  margin: 30px 0;
  padding: 24px;
  border: 1px solid var(--w5-rule);
  border-radius: var(--w5-radius-panel);
  background: color-mix(in srgb, var(--w5-cyan-soft) 34%, var(--paper));
}

.lecture-cues > ol,
.debug-protocol > ol {
  margin: 16px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  list-style: none;
}

.lecture-cues li,
.debug-protocol li {
  min-width: 0;
  padding: 16px 16px 2px 0;
}

.lecture-cues li:nth-child(even),
.debug-protocol li:nth-child(even) {
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.lecture-cues strong,
.debug-protocol strong {
  color: var(--ink-strong);
  font-size: 13px;
}

.lecture-cues p,
.debug-protocol p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
}

/* Retrieval feedback */

.knowledge-check {
  margin: 34px 0;
  padding: 24px;
  border: 1px solid var(--w5-rule);
  border-radius: var(--w5-radius-panel);
  background: color-mix(in srgb, var(--w5-cyan-soft) 38%, var(--paper));
}

.quiz-kicker {
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1.35 var(--mono);
  text-transform: uppercase;
}

.knowledge-check h3 {
  margin: 8px 0;
  color: var(--ink-strong);
  font-size: 18px;
}

.knowledge-check > p {
  margin: 0;
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
}

.quiz-options {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.quiz-option {
  min-height: 44px;
  padding: 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--w5-radius-control);
  background: var(--paper);
  color: var(--ink-strong);
  font: 650 var(--w5-control-size)/1.25 var(--mono);
  cursor: pointer;
}

.quiz-option[data-state="correct"] {
  border-color: var(--w5-lime);
  background: color-mix(in srgb, var(--w5-lime-soft) 68%, var(--paper));
  color: var(--w5-success);
}

.quiz-option[data-state="incorrect"] {
  border-color: var(--w5-coral);
  background: color-mix(in srgb, var(--w5-coral-soft) 62%, var(--paper));
  color: var(--w5-danger);
}

.quiz-feedback {
  min-height: 1.5em;
  margin-top: 12px !important;
  color: var(--ink) !important;
  font-weight: 620;
}

/* Mission */

.mission-contract {
  margin: 28px 0;
  border: 1px solid var(--w5-rule);
  border-radius: var(--w5-radius-panel);
  overflow: hidden;
  background: var(--paper);
}

.mission-contract-main {
  padding: 27px;
  background: color-mix(in srgb, var(--w5-page-accent-soft) 38%, var(--paper));
}

.mission-contract-main > span {
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1.4 var(--mono);
  text-transform: uppercase;
}

.mission-contract-main > strong {
  max-width: 680px;
  margin-top: 9px;
  display: block;
  color: var(--ink-strong);
  font-size: clamp(21px, 2.6vw, 28px);
  letter-spacing: -.03em;
  line-height: 1.36;
}

.mission-contract-main > p {
  max-width: 700px;
  margin: 9px 0 0;
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
}

.mission-facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.mission-facts > div {
  min-width: 0;
  padding: 18px;
  border-top: 1px solid var(--line);
}

.mission-facts > div + div {
  border-left: 1px solid var(--line);
}

.mission-facts dt {
  color: var(--quiet);
  font: 650 var(--w5-label-size)/1.35 var(--mono);
  text-transform: uppercase;
}

.mission-facts dd {
  margin: 7px 0 0;
  color: var(--ink-strong);
  font-size: 13px;
  font-weight: 650;
}

.starter-pack {
  margin: 28px 0;
  padding: 24px;
  border: 1px solid var(--w5-rule);
  border-radius: var(--w5-radius-panel);
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(190px, .6fr);
  gap: 24px;
  background: var(--paper);
}

.starter-pack h3 {
  margin: 7px 0 8px;
  color: var(--ink-strong);
  font-size: 20px;
}

.starter-pack p,
.starter-pack li {
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
}

.starter-pack ul {
  margin: 10px 0 0;
  padding-left: 18px;
}

.starter-download {
  min-height: 96px;
  padding: 17px;
  border: 1px solid var(--w5-page-accent);
  border-radius: var(--w5-radius-panel);
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: color-mix(in srgb, var(--w5-page-accent-soft) 55%, var(--paper));
  color: var(--ink-strong);
  text-decoration: none;
}

.starter-download span {
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1.3 var(--mono);
  text-transform: uppercase;
}

.starter-download strong {
  margin-top: 7px;
  font-size: 14px;
}

.pass-gate {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.pass-gate article {
  min-width: 0;
  min-height: 0;
  padding: 22px 18px;
  border: 0;
  border-left: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
}

.pass-gate article:first-child {
  border-left: 0;
}

.pass-gate article > span {
  color: var(--w5-lime-dark);
  font: 650 var(--w5-label-size)/1 var(--mono);
}

.pass-gate article > strong {
  margin-top: 20px;
  display: block;
  color: var(--ink-strong);
  font-size: 14px;
}

.pass-gate article > p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
  line-height: 1.55;
}

/* Test record */

.test-panel {
  margin: 28px 0;
  border: 1px solid var(--w5-rule);
  border-radius: var(--w5-radius-panel);
  overflow: hidden;
  background: var(--paper);
}

.test-identity {
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.test-identity label {
  color: var(--quiet);
  font: 650 var(--w5-label-size)/1.4 var(--mono);
  text-transform: uppercase;
}

.test-identity-note {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
}

.test-identity input {
  width: 100%;
  min-height: 38px;
  margin-top: 7px;
  padding: 8px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--w5-radius-control);
  background: var(--paper);
  color: var(--ink-strong);
}

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

.test-table {
  width: 100%;
  min-width: 800px;
  border-collapse: collapse;
}

.test-table th,
.test-table td {
  padding: 13px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  text-align: left;
}

.test-table thead th {
  color: var(--quiet);
  font: 650 var(--w5-label-size)/1.4 var(--mono);
  text-transform: uppercase;
}

.test-table tbody th {
  width: 76px;
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1.4 var(--mono);
}

.test-table td {
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
  line-height: 1.5;
}

.test-table select,
.test-table input {
  width: 100%;
  min-height: 36px;
  padding: 7px 8px;
  border: 1px solid var(--line);
  border-radius: var(--w5-radius-control);
  background: var(--paper);
  color: var(--ink-strong);
  font-size: 13px;
}

.test-table tr[data-result="pass"] {
  background: color-mix(in srgb, var(--w5-lime-soft) 35%, transparent);
}

.test-table tr[data-result="fail"] {
  background: color-mix(in srgb, var(--w5-coral-soft) 35%, transparent);
}

.test-actions {
  padding: 15px 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.test-progress {
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1.4 var(--mono);
}

.test-progress[data-complete="true"] {
  color: var(--w5-success);
}

.test-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.test-button {
  min-height: 36px;
  padding: 8px 11px;
  border: 1px solid var(--line-strong);
  border-radius: var(--w5-radius-control);
  background: var(--paper);
  color: var(--ink-strong);
  font: 650 var(--w5-control-size)/1 var(--mono);
  cursor: pointer;
}

.test-button-primary {
  border-color: var(--w5-page-accent-strong);
  background: var(--w5-page-accent-strong);
  color: var(--w5-on-accent);
}

.test-status-message {
  min-height: 1.5em;
  margin: 0;
  padding: 0 20px 17px;
  color: var(--muted);
  font-size: 13px;
}

/* Checklist and hints */

.build-checklist {
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.build-check {
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 13px;
  align-items: start;
}

.build-check input {
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  accent-color: var(--w5-lime-dark);
}

.build-check label {
  color: var(--ink-strong);
  font-size: 13px;
  font-weight: 620;
  cursor: pointer;
}

.build-check p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
  font-weight: 400;
}

.build-check[data-checked="true"] label {
  color: var(--quiet);
  text-decoration: line-through;
  text-decoration-color: color-mix(in srgb, var(--quiet) 55%, transparent);
}

.checklist-progress {
  margin-top: 14px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
}

.checklist-progress span {
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1.4 var(--mono);
}

.build-checklist[data-complete="true"] + .checklist-progress span {
  color: var(--w5-success);
}

.checklist-reset {
  min-height: 34px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: var(--w5-radius-control);
  background: transparent;
  color: var(--muted);
  font: 600 var(--w5-control-size)/1 var(--mono);
  cursor: pointer;
}

.checklist-status-message {
  min-height: 1.5em;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.hint-ladder {
  margin-top: 28px;
  border-top: 1px solid var(--line-strong);
}

.hint-ladder details {
  border-bottom: 1px solid var(--line);
}

.hint-ladder summary {
  min-height: 66px;
  padding: 17px 4px;
  display: grid;
  grid-template-columns: 165px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  color: var(--ink-strong);
  cursor: pointer;
}

.hint-ladder summary span {
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1.35 var(--mono);
  text-transform: uppercase;
}

.hint-ladder summary strong {
  font-size: 14px;
}

.hint-ladder details > div {
  margin: 0 0 18px 183px;
  padding: 17px 19px;
  border-left: 3px solid var(--w5-cyan);
  background: color-mix(in srgb, var(--w5-cyan-soft) 38%, var(--paper));
}

.hint-ladder details p {
  margin: 0;
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
}

/* Sources, next lesson, toc */

.source-grid {
  margin-top: 25px;
}

.source-card a {
  color: var(--ink-strong);
  font-size: 14px;
  font-weight: 700;
}

.next-lesson {
  margin-top: 78px;
  padding: 26px 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 28px;
}

.next-lesson > span {
  color: var(--w5-page-accent-strong);
  font: 650 var(--w5-label-size)/1.4 var(--mono);
  text-transform: uppercase;
}

.next-lesson h3 {
  margin: 0;
  color: var(--ink-strong);
  font-size: 21px;
}

.next-lesson p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: var(--w5-reading-small-size);
}

body.course-game-engine-1.game-engine-week-five .toc {
  top: 84px;
  max-height: calc(100vh - 108px);
  padding: 0;
  border: 0;
  border-top: 1px solid var(--line-strong);
  border-radius: 0;
  overflow: auto;
  background: transparent;
  box-shadow: none;
}

body.course-game-engine-1.game-engine-week-five .toc-title {
  padding: 15px 0 10px;
  color: var(--ink-strong);
  font: 650 var(--w5-label-size)/1.3 var(--mono);
  text-transform: uppercase;
}

body.course-game-engine-1.game-engine-week-five .toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

body.course-game-engine-1.game-engine-week-five .toc li {
  border-top: 1px solid var(--line);
}

body.course-game-engine-1.game-engine-week-five .toc a {
  padding: 10px 0;
  border: 0;
  display: block;
  color: var(--quiet);
  font-size: var(--w5-label-size);
  line-height: 1.45;
}

body.course-game-engine-1.game-engine-week-five .toc a[aria-current="location"] {
  color: var(--w5-page-accent-strong);
  text-decoration: none;
  padding-left: 11px;
  box-shadow: inset 2px 0 0 var(--w5-page-accent);
}

.footer-note {
  margin: 0;
  padding: 20px 24px 30px;
  color: var(--quiet);
  font: 500 var(--w5-label-size)/1.4 var(--mono);
  text-align: center;
  text-transform: uppercase;
}

.week-five-hero-action,
.copy-code,
.quiz-option,
.starter-download,
.test-button,
.checklist-reset {
  transition:
    transform 150ms var(--w5-ease-out),
    border-color 150ms ease,
    background-color 150ms ease,
    color 150ms ease;
}

.source-card a,
body.course-game-engine-1.game-engine-week-five .toc a {
  transition: color 150ms ease;
}

:is(.week-five-hero-action, .copy-code, .quiz-option, .starter-download, .test-button, .checklist-reset):active {
  transform: scale(.97);
}

@media (hover: hover) and (pointer: fine) {
  .week-five-hero-action:hover {
    border-color: var(--w5-page-accent);
    color: var(--w5-page-accent-strong);
    text-decoration: none;
  }

  .week-five-hero-action-primary:hover {
    background: var(--w5-charcoal);
    color: #fff;
  }

  .copy-code:hover {
    border-color: rgba(225, 240, 236, .62);
  }

  .quiz-option:hover {
    border-color: var(--w5-page-accent);
  }

  .starter-download:hover {
    background: color-mix(in srgb, var(--w5-page-accent-soft) 82%, var(--paper));
    text-decoration: none;
  }

  .source-card a:hover {
    color: var(--w5-page-accent-strong);
  }

  body.course-game-engine-1.game-engine-week-five .toc a:hover {
    color: var(--w5-page-accent-strong);
    text-decoration: none;
  }
}

@media (max-width: 1040px) {
  body.course-game-engine-1.game-engine-week-five [id] {
    scroll-margin-top: 128px;
  }

  body.course-game-engine-1.game-engine-week-five .week-five-hero .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .week-five-hero-visual {
    max-width: 780px;
  }

  body.course-game-engine-1.game-engine-week-five .layout,
  body.course-game-engine-1.game-engine-week-five main.layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 34px;
  }

  body.course-game-engine-1.game-engine-week-five .toc {
    position: sticky;
    top: 58px;
    z-index: 18;
    order: -1;
    max-height: none;
    margin: -34px calc(50% - 50vw) 4px;
    padding: 0 24px;
    border-top: 0;
    border-bottom: 1px solid var(--line);
    overflow-x: auto;
    background: color-mix(in srgb, var(--bg) 96%, transparent);
    backdrop-filter: blur(12px);
    scrollbar-width: none;
  }

  body.course-game-engine-1.game-engine-week-five .toc::-webkit-scrollbar {
    display: none;
  }

  body.course-game-engine-1.game-engine-week-five .toc-title {
    display: none;
  }

  body.course-game-engine-1.game-engine-week-five .toc ol {
    width: max-content;
    display: flex;
  }

  body.course-game-engine-1.game-engine-week-five .toc li {
    border: 0;
  }

  body.course-game-engine-1.game-engine-week-five .toc a {
    min-height: 48px;
    padding: 16px 12px 13px;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
  }

  body.course-game-engine-1.game-engine-week-five .toc a[aria-current="location"] {
    padding-left: 12px;
    border-bottom-color: var(--w5-page-accent);
    box-shadow: none !important;
  }

  .pass-gate,
  .contact-model {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .pass-gate article:nth-child(3) {
    border-left: 0;
  }

  .pass-gate article:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }

  .contact-model > div:nth-child(2)::after {
    display: none;
  }
}

@media (max-width: 760px) {
  body.course-game-engine-1.game-engine-week-five .week-five-hero .hero-inner {
    min-height: 0;
    padding: 38px 0 44px;
  }

  body.course-game-engine-1.game-engine-week-five .week-five-hero h1 {
    font-size: clamp(35px, 10.5vw, 49px);
  }

  body.course-game-engine-1.game-engine-week-five .layout,
  body.course-game-engine-1.game-engine-week-five main.layout {
    padding-bottom: 88px;
  }

  .week-five-lesson-facts,
  .concept-grid,
  .comparison-grid,
  .requirement-grid,
  .constraint-grid,
  .submission-grid,
  .source-grid,
  .role-grid,
  .prediction-grid,
  .pass-gate,
  .contact-model,
  .lecture-cues > ol,
  .debug-protocol > ol,
  .mission-facts,
  .test-identity {
    grid-template-columns: minmax(0, 1fr);
  }

  .scope-line,
  .starter-pack,
  .next-lesson {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .session-track li {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 6px 13px;
  }

  .session-track p {
    grid-column: 2;
  }

  .event-timeline {
    grid-template-columns: minmax(0, 1fr);
  }

  .event-timeline article + article {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .contact-model > div::after {
    display: none !important;
  }

  .system-layer {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .matrix-row {
    grid-template-columns: 1.1fr repeat(3, .7fr);
    gap: 5px;
  }

  .quiz-options {
    grid-template-columns: minmax(0, 1fr);
  }

  .code-reading li {
    grid-template-columns: minmax(0, 1fr);
    gap: 5px;
  }

  .mission-facts > div + div,
  .lecture-cues li:nth-child(even),
  .debug-protocol li:nth-child(even) {
    padding-left: 0;
    border-left: 0;
  }

  .hint-ladder summary {
    grid-template-columns: minmax(0, 1fr);
    gap: 5px;
  }

  .hint-ladder details > div {
    margin-left: 0;
  }

  .test-table-wrap {
    overflow-x: visible;
  }

  .test-table {
    min-width: 0;
  }

  .test-table,
  .test-table tbody,
  .test-table tr,
  .test-table th,
  .test-table td {
    width: 100%;
    display: block;
  }

  .test-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    clip-path: inset(50%);
    overflow: hidden;
    white-space: nowrap;
  }

  .test-table tbody tr {
    padding: 18px 20px;
    border-bottom: 1px solid var(--line);
  }

  .test-table th,
  .test-table td {
    padding: 0;
    border: 0;
  }

  .test-table tbody th {
    width: auto;
    margin-bottom: 14px;
    font-size: 14px;
  }

  .test-table td + td {
    margin-top: 14px;
  }

  .test-table td::before {
    margin-bottom: 5px;
    display: block;
    color: var(--quiet);
    font: 650 var(--w5-label-size)/1.35 var(--mono);
  }

  .test-table td:nth-of-type(1)::before { content: "조작과 조건"; }
  .test-table td:nth-of-type(2)::before { content: "기대 결과"; }
  .test-table td:nth-of-type(3)::before { content: "판정"; }
  .test-table td:nth-of-type(4)::before { content: "관찰과 수정 기록"; }

  .test-actions {
    align-items: flex-start;
  }

  .week-five-hero-actions,
  .test-actions,
  .checklist-progress {
    flex-direction: column;
    align-items: stretch;
  }

  .week-five-hero-action,
  .test-button {
    justify-content: center;
  }

  .pass-gate article {
    border-left: 0;
  }

  .pass-gate article + article {
    border-top: 1px solid var(--line);
  }
}

@media (prefers-color-scheme: dark) {
  body.course-game-engine-1.game-engine-week-five {
    --bg: #101614;
    --paper: #171f1c;
    --surface: #202a26;
    --surface-strong: #2b3732;
    --ink: #d8e0da;
    --ink-strong: #f1f5ef;
    --muted: #aab5ad;
    --quiet: #929e95;
    --line: rgba(227, 236, 229, .13);
    --line-strong: rgba(227, 236, 229, .25);
    --accent: #94b9bf;
    --accent-strong: #bbd4d8;
    --link: #acd0d5;
    --w5-amber: #e6a654;
    --w5-amber-dark: #f1bd75;
    --w5-amber-soft: #45331f;
    --w5-lime: #b3dc4f;
    --w5-lime-dark: #c6ec70;
    --w5-lime-soft: #30401e;
    --w5-cyan: #69c6d0;
    --w5-cyan-dark: #91d8df;
    --w5-cyan-soft: #203b3c;
    --w5-coral: #ec846c;
    --w5-coral-dark: #f2aa98;
    --w5-coral-soft: #4b2d27;
    --w5-violet: #aeb0ea;
    --w5-violet-dark: #cacbfa;
    --w5-violet-soft: #32334d;
    --w5-success: #bde56b;
    --w5-danger: #f0a18e;
    --w5-on-accent: #151b19;
  }

  .week-five-hero-visual img {
    filter: brightness(.9) saturate(.93);
  }
}

@media (prefers-reduced-motion: reduce) {
  html.game-engine-week-five-root {
    scroll-behavior: auto;
  }

  body.course-game-engine-1.game-engine-week-five *,
  body.course-game-engine-1.game-engine-week-five *::before,
  body.course-game-engine-1.game-engine-week-five *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .001ms !important;
  }
}

@media print {
  body.course-game-engine-1.game-engine-week-five {
    --bg: #fff;
    --paper: #fff;
    --ink: #222;
    --ink-strong: #000;
    --muted: #444;
    --quiet: #555;
    --line: #d7d7d7;
    --line-strong: #999;
    background: #fff;
  }

  body.course-game-engine-1.game-engine-week-five .lesson-header,
  body.course-game-engine-1.game-engine-week-five .toc,
  .copy-code,
  .checklist-reset,
  .test-buttons,
  .footer-note {
    display: none !important;
  }

  body.course-game-engine-1.game-engine-week-five .week-five-hero .hero-inner,
  body.course-game-engine-1.game-engine-week-five .layout,
  body.course-game-engine-1.game-engine-week-five main.layout {
    width: 100%;
    min-height: 0;
    padding: 24px 0;
    display: block;
  }

  .week-five-hero-visual {
    max-width: 620px;
    margin-top: 24px;
    box-shadow: none;
  }

  .week-five-section,
  .code-card,
  .concept-card,
  .comparison-card,
  .requirement-grid article,
  .constraint-grid article,
  .submission-grid article,
  .source-card,
  .knowledge-check,
  .mission-contract,
  .pass-gate article,
  .hint-ladder details,
  .test-panel {
    break-inside: avoid;
    box-shadow: none;
  }
}