:root {
  color-scheme: dark;
  --bg: #101d28;
  --panel: #182a36;
  --ink: #f2efe4;
  --muted: #a9bdc8;
  --line: #344a57;
  --teal: #89d2cb;
  --amber: #efb46c;
  --dark: #0b1721;
  --radius: 14px;
  font-family:
    Inter,
    ui-sans-serif,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  font-size: 18px;
  line-height: 1.55;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
}
a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}
button,
input,
select {
  font: inherit;
}
button,
.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  min-height: 48px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: var(--amber);
  color: var(--dark);
  font-weight: 650;
  text-decoration: none;
  cursor: pointer;
  line-height: 1.3;
}
button:hover,
.button:hover {
  filter: brightness(1.08);
}
button:disabled {
  opacity: 0.45;
  cursor: default;
}
button.quiet,
.button.quiet {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
}
button.secondary {
  background: var(--teal);
}
input:not([type="checkbox"], [type="radio"], [type="range"]),
select {
  width: 100%;
  background: var(--dark);
  color: var(--ink);
  border: 1px solid #6b818e;
  border-radius: 6px;
  min-height: 50px;
  padding: 10px 12px;
  margin: 7px 0 12px;
}
input[type="checkbox"],
input[type="radio"] {
  width: 23px;
  height: 23px;
  accent-color: var(--teal);
  flex-shrink: 0;
}
input[type="range"] {
  width: 100%;
  height: 48px;
  accent-color: var(--teal);
}
label {
  display: block;
  font-weight: 550;
}
h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}
h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.1;
  letter-spacing: -0.035em;
  font-weight: 640;
  margin-bottom: 22px;
}
h2 {
  font-size: 1.6rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
h3 {
  font-size: 1.15rem;
  line-height: 1.3;
}
p {
  margin-bottom: 18px;
}
small,
.small {
  font-size: 0.8rem;
}
strong,
b {
  font-weight: 650;
}
img {
  max-width: 100%;
}
:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 4px;
}
main:focus {
  outline: none;
}
.site-header {
  max-width: 1440px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
  padding: 26px 5% 24px;
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 13px;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-weight: 750;
  font-size: 1.5rem;
  letter-spacing: 0.14em;
  line-height: 1.2;
  text-decoration: none;
}
.brand small {
  display: block;
  font:
    500 0.5rem/1.8 ui-monospace,
    monospace;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-top: 4px;
}
.brand-icon {
  font-size: 2.7rem;
  color: var(--amber);
  line-height: 1;
}
.main-nav {
  display: flex;
  gap: 8px;
}
.main-nav a {
  font-size: 0.86rem;
  padding: 12px 15px;
  text-decoration: none;
  border-radius: 6px;
  color: var(--muted);
}
.main-nav a[aria-current] {
  color: var(--ink);
  background: #263d49;
}
.portal-link {
  font-size: 0.75rem;
  color: var(--muted);
  white-space: nowrap;
}
main {
  max-width: 1320px;
  padding: 32px 42px 60px;
  margin: auto;
}
.eyebrow {
  font:
    600 0.62rem/1.5 ui-monospace,
    SFMono-Regular,
    Consolas,
    monospace;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 13px;
}
.bridge-hero {
  position: relative;
  overflow: hidden;
  min-height: 390px;
  border: 1px solid #38515f;
  border-radius: var(--radius);
  background: #0a1621;
}
.hero-art {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  image-rendering: pixelated;
}
.bridge-hero:after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(7, 20, 30, 0.96),
    rgba(7, 20, 30, 0.8) 36%,
    rgba(7, 20, 30, 0.12) 72%
  );
  pointer-events: none;
}
.hero-copy {
  position: relative;
  z-index: 1;
  padding: 40px 42px 52px;
  max-width: 620px;
}
.hero-copy h1 {
  font-size: clamp(2rem, 3.5vw, 2.9rem);
  line-height: 1.1;
  margin-bottom: 20px;
}
.hero-copy p:not(.eyebrow) {
  color: #c1d5df;
  font-size: 0.94rem;
}
.hero-copy .eyebrow {
  color: #b4d6d8;
}
.hero-status {
  position: absolute;
  bottom: 18px;
  right: 22px;
  z-index: 1;
  font:
    0.58rem ui-monospace,
    monospace;
  background: #0c1d29d9;
  padding: 8px 11px;
  border: 1px solid #42606e;
  border-radius: 4px;
  color: #c8dfdf;
  letter-spacing: 0.04em;
}
.hero-status i {
  display: inline-block;
  background: var(--teal);
  width: 6px;
  height: 6px;
  margin-right: 6px;
}
.actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 20px;
}
.hero-copy .actions {
  gap: 10px;
}
.hero-copy .button,
.hero-copy button {
  font-size: 0.83rem;
}
.light {
  background: #101d28a6 !important;
  border-color: #6b818e !important;
}
.overview {
  margin-top: 38px;
}
.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  margin-bottom: 20px;
}
.section-heading h2 {
  margin-bottom: 0;
}
.badge {
  display: inline-block;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  font:
    500 0.61rem ui-monospace,
    monospace;
  letter-spacing: 0.02em;
  color: var(--muted);
  white-space: nowrap;
}
.network {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}
.station-card {
  border: 1px solid var(--line);
  border-top: 3px solid var(--station);
  border-radius: 6px;
  padding: 17px 17px 14px;
  background: var(--panel);
  text-decoration: none;
  position: relative;
  transition:
    transform 0.18s,
    border-color 0.18s;
}
.station-card:hover {
  transform: translateY(-3px);
  border-color: var(--station);
}
.station-number {
  font:
    0.58rem ui-monospace,
    monospace;
  letter-spacing: 0.12em;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
}
.station-icon {
  display: block;
  color: var(--station);
  font-size: 2rem;
  line-height: 1;
  margin: 24px 0 18px;
}
.station-card h3 {
  font-size: 1rem;
  margin: 0 0 9px;
}
.station-card p {
  font-size: 0.75rem;
  line-height: 1.4;
  min-height: 42px;
  color: var(--muted);
  margin-bottom: 20px;
}
.station-progress {
  display: flex;
  justify-content: space-between;
  font:
    0.54rem ui-monospace,
    monospace;
  color: var(--muted);
  padding-top: 13px;
  border-top: 1px solid var(--line);
}
.restored .station-number {
  color: var(--teal);
}
.chapter-flow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 14px 12px;
  font:
    0.55rem ui-monospace,
    monospace;
  color: var(--muted);
}
.chapter-flow b {
  color: var(--teal);
}
.lower-deck {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 24px;
  margin-top: 22px;
}
.sera-card {
  display: flex;
  align-items: stretch;
  background: #1e3540;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}
.sera-card img {
  width: 38%;
  object-fit: cover;
  object-position: 50% 30%;
  image-rendering: pixelated;
}
.sera-card > div {
  padding: 26px 25px;
}
.sera-card h2 {
  font-size: 1.35rem;
}
.sera-card p:not(.eyebrow) {
  font-size: 0.8rem;
  color: #bfd0d7;
  margin: 0;
}
.panel {
  padding: 30px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin: 24px 0;
}
.panel.compact {
  margin: 0;
  padding: 22px 26px;
}
.deck-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  font-size: 0.91rem;
}
.deck-link:last-child {
  border: 0;
}
.deck-link small {
  display: block;
  color: var(--muted);
  font-size: 0.65rem;
  margin-top: 3px;
}
.deck-link b {
  color: var(--amber);
}
.page-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 20px 0 32px;
}
.page-heading h1 {
  max-width: 820px;
}
.page-heading p:not(.eyebrow) {
  max-width: 780px;
  color: var(--muted);
}
.briefing {
  display: flex;
  gap: 25px;
  align-items: center;
  background: #1e3540;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.briefing img {
  width: 130px;
  height: 130px;
  object-fit: cover;
  border-radius: 8px;
  image-rendering: pixelated;
}
.briefing p {
  max-width: 780px;
}
.briefing .eyebrow {
  margin-bottom: 8px;
}
.briefing button {
  font-size: 0.85rem;
  min-height: 44px;
  padding: 8px 15px;
}
.mission-list {
  margin: 25px 0;
}
.mission-row {
  display: flex;
  align-items: center;
  gap: 24px;
  border-bottom: 1px solid var(--line);
  padding: 23px 8px;
  text-decoration: none;
}
.mission-row:hover {
  background: var(--panel);
}
.mission-row div {
  flex: 1;
}
.mission-row h2 {
  font-size: 1.18rem;
  margin: 0 0 7px;
}
.mission-row p {
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0;
}
.mission-index {
  font:
    1.4rem ui-monospace,
    monospace;
  color: var(--amber);
}
.muted {
  color: var(--muted);
}
.lesson-top {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-size: 0.8rem;
  color: var(--muted);
  padding: 0 0 20px;
}
.step-dots {
  display: flex;
  gap: 7px;
  margin-bottom: 30px;
}
.step-dots a {
  height: 9px;
  flex: 1;
  border-radius: 2px;
  background: var(--line);
  min-width: 18px;
}
.step-dots a.active {
  background: var(--teal);
}
.lesson-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 420px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.lesson-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  padding: 25px 18px;
  background: #122532;
  color: var(--teal);
  border-right: 1px solid var(--line);
}
.diagram {
  width: 100%;
  height: auto;
  font-family: ui-sans-serif, system-ui, sans-serif;
}
.diagram-caption {
  font:
    0.65rem ui-monospace,
    monospace;
  color: var(--muted);
  margin-top: 20px;
}
.lesson-copy {
  padding: 38px 34px;
}
.lesson-copy h1 {
  font-size: 2rem;
}
.lesson-text {
  font-size: 1.08rem;
  line-height: 1.65;
}
.formula {
  font-size: 1.35rem;
  background: #0b1d28;
  border-left: 3px solid var(--amber);
  padding: 17px 19px;
  border-radius: 3px;
  margin: 22px 0;
  line-height: 1.5;
  overflow-wrap: anywhere;
}
.lesson-controls {
  display: flex;
  justify-content: space-between;
  margin: 24px 0 34px;
}
.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.task-panel {
  max-width: 920px;
  margin: 25px auto;
}
.task-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  margin-bottom: 20px;
}
.task-top button {
  font-size: 0.8rem;
}
.task-top p {
  margin: 0;
}
.task-panel h2 {
  font-size: 1.6rem;
  line-height: 1.45;
  margin: 20px 0 30px;
}
.choices {
  margin: 0;
  padding: 0;
  border: 0;
}
.choices legend {
  margin-bottom: 10px;
  font-size: 0.85rem;
  color: var(--muted);
}
.choices label {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px 18px;
  background: #122532;
  border: 1px solid #465c69;
  border-radius: 8px;
  margin: 10px 0;
  font-weight: 450;
  cursor: pointer;
}
.choices label:has(input:checked) {
  border-color: var(--teal);
  background: #25454b;
}
.keypad {
  display: flex;
  gap: 9px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.keypad button {
  background: #294350;
  color: var(--ink);
  min-width: 48px;
  padding: 9px 16px;
}
.feedback,
.hint {
  padding: 20px 23px;
  border: 1px solid #9e8059;
  border-radius: 8px;
  margin-top: 25px;
  background: #342f26;
}
.feedback p:last-child,
.hint p:last-child {
  margin: 8px 0 0;
}
.success {
  background: #173d37;
  border-color: #5aa697;
}
.hint {
  background: #1a3647;
  border-color: #597b8d;
}
.hint li {
  padding: 6px 0;
}
.calculator {
  margin-top: 25px;
  border-top: 1px solid var(--line);
  padding-top: 15px;
}
.calculator summary {
  cursor: pointer;
  padding: 7px 0;
}
.calculator label {
  margin-top: 12px;
}
.calculator output {
  display: inline-block;
  margin: 10px;
  font-weight: 600;
}
.square-stage,
.rectangle-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 230px;
  margin: 20px 0;
}
.area-square,
.heron-rectangle {
  border: 2px solid var(--teal);
  background:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 19px,
      #6ec8c833 19px,
      #6ec8c833 20px
    ),
    repeating-linear-gradient(
      90deg,
      #6ec8c814,
      #6ec8c814 19px,
      #6ec8c833 19px,
      #6ec8c833 20px
    );
  display: flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
}
.readings {
  display: flex;
  justify-content: center;
  gap: 35px;
  margin: 20px;
}
.zoom-line {
  height: 70px;
  position: relative;
  border-bottom: 3px solid var(--teal);
  margin: 15px 25px 30px;
}
.zoom-line i {
  position: absolute;
  bottom: -10px;
  border-bottom: 18px solid var(--amber);
  font-style: normal;
  transform: translateX(-50%);
}
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.comparison > div {
  padding: 25px;
  background: #122532;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.table-wrap {
  overflow-x: auto;
}
table {
  border-collapse: collapse;
  width: 100%;
  text-align: left;
  font-variant-numeric: tabular-nums;
}
th,
td {
  border-bottom: 1px solid var(--line);
  padding: 12px;
}
th {
  font-size: 0.8rem;
  color: var(--muted);
}
progress {
  width: 100%;
  height: 10px;
  accent-color: var(--teal);
  margin: 0 0 24px;
}
.exam-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 25px;
}
.exam-nav button {
  min-width: 46px;
  padding: 9px;
  font-size: 0.8rem;
}
.exam-nav .active {
  background: var(--teal);
}
.result-list {
  margin: 25px 0;
}
.result-list details {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.result-list summary {
  cursor: pointer;
  min-height: 44px;
}
.result-list li {
  margin: 10px 0;
}
.skill-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 25px;
}
.skill-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.83rem;
  text-decoration: none;
}
.skill-status {
  font-size: 0.67rem;
  color: var(--muted);
  text-align: right;
  max-width: 150px;
}
.skill-status.practised {
  color: var(--amber);
}
.skill-status.retained {
  color: var(--teal);
}
.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.toggle {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 450;
}
.file-input {
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  min-height: 0 !important;
  position: absolute;
  opacity: 0;
}
.worksheet {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-top: 30px;
}
.written-task {
  margin: 35px 0;
  break-inside: avoid;
}
.writing-space {
  min-height: 130px;
  background: repeating-linear-gradient(
    transparent,
    transparent 29px,
    var(--line) 29px,
    var(--line) 30px
  );
}
.written-solution {
  background: #203d45;
  padding: 22px;
  margin-top: 15px;
  border-left: 3px solid var(--teal);
}
.with-solutions .writing-space {
  display: none;
}
.notice {
  position: sticky;
  bottom: 12px;
  background: #253e49;
  border: 1px solid #66838e;
  border-radius: 8px;
  padding: 13px 20px;
  margin: 0 auto;
  max-width: 900px;
  width: calc(100% - 40px);
  font-size: 0.83rem;
  z-index: 20;
  box-shadow: 0 4px 20px #0005;
}
.notice:empty {
  display: none;
}
.banner {
  padding: 14px 5%;
  background: #49412d;
  border-bottom: 1px solid #a38758;
}
.banner button {
  margin: 10px;
}
footer {
  max-width: 1240px;
  margin: auto;
  padding: 28px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  border-top: 1px solid var(--line);
  font:
    500 0.58rem ui-monospace,
    monospace;
  letter-spacing: 0.08em;
  color: var(--muted);
}
footer button {
  font-size: 0.65rem;
  padding: 5px 10px;
  min-height: 44px;
}
.skip-link {
  position: absolute;
  left: 12px;
  top: -100px;
  z-index: 100;
  background: var(--amber);
  color: var(--dark);
  padding: 12px;
}
.skip-link:focus {
  top: 10px;
}
[hidden] {
  display: none !important;
}
.portal-heading {
  margin: 45px 0 40px;
}
.portal-heading h1 {
  font-size: clamp(2.5rem, 5vw, 4.4rem);
  max-width: 850px;
  margin-bottom: 25px;
}
.portal-heading > p:last-child {
  color: var(--muted);
}
.game-card {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  text-decoration: none;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.game-card > img {
  height: 100%;
  width: 100%;
  object-fit: cover;
  object-position: 65%;
  image-rendering: pixelated;
}
.game-card > div {
  padding: 36px;
}
.game-card h2 {
  font-size: 2.4rem;
}
.game-card p:not(.eyebrow) {
  color: var(--muted);
  font-size: 0.95rem;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0;
}
.tags span {
  font:
    0.65rem ui-monospace,
    monospace;
  border: 1px solid var(--line);
  padding: 7px;
}
.portal-note {
  margin-top: 25px;
  font-size: 0.8rem;
}
.motion .hero-art {
  animation: drift 24s ease-in-out infinite alternate;
}
@keyframes drift {
  from {
    transform: scale(1.02) translateY(-2px);
  }
  to {
    transform: scale(1.05) translateY(4px);
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}
@media (max-width: 1050px) {
  .site-header {
    padding: 22px 28px;
    gap: 15px;
  }
  .portal-link {
    display: none;
  }
  main {
    padding: 28px;
  }
  .main-nav a {
    padding: 10px 12px;
  }
  .network {
    gap: 9px;
  }
  .station-card {
    padding: 15px 12px;
  }
  .station-card h3 {
    font-size: 0.85rem;
  }
  .station-card p {
    font-size: 0.7rem;
  }
  .station-progress {
    font-size: 0.49rem;
  }
  .hero-copy {
    padding: 32px 30px 55px;
  }
  .hero-copy h1 {
    font-size: 2.4rem;
  }
  .lower-deck {
    gap: 16px;
    grid-template-columns: 1.2fr 1fr;
  }
  .sera-card > div {
    padding: 22px 18px;
  }
  .sera-card img {
    width: 34%;
  }
  .sera-card h2 {
    font-size: 1.2rem;
  }
  .lesson-copy {
    padding: 28px 24px;
  }
  .lesson-text {
    font-size: 1rem;
  }
  .lesson-copy h1 {
    font-size: 1.65rem;
  }
  footer {
    margin: 0 28px;
  }
  .chapter-flow {
    font-size: 0.48rem;
  }
  .skill-grid {
    grid-template-columns: 1fr;
  }
  .page-heading h1 {
    font-size: 2.4rem;
  }
}
@media (max-width: 760px) {
  :root {
    font-size: 17px;
  }
  .site-header {
    padding: 18px 20px;
    flex-wrap: wrap;
  }
  .brand {
    font-size: 1.3rem;
  }
  .brand small {
    font-size: 0.46rem;
  }
  .brand-icon {
    font-size: 2.3rem;
  }
  .main-nav {
    width: 100%;
    justify-content: space-between;
    gap: 4px;
    margin-top: 8px;
  }
  .main-nav a {
    font-size: 0.85rem;
    flex: 1;
    text-align: center;
    padding: 11px 8px;
  }
  main {
    padding: 20px 18px 40px;
  }
  .bridge-hero {
    min-height: 430px;
  }
  .hero-art {
    object-position: 65%;
    opacity: 0.65;
  }
  .bridge-hero:after {
    background: linear-gradient(90deg, #07141ee8, #07141e90);
  }
  .hero-copy {
    padding: 30px 24px 65px;
  }
  .hero-copy h1 {
    font-size: 2.35rem;
  }
  .hero-status {
    left: 22px;
    right: auto;
    font-size: 0.53rem;
  }
  .section-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }
  .section-heading .badge {
    display: none;
  }
  .network {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }
  .station-card:last-child {
    grid-column: 1/-1;
  }
  .station-card:last-child .station-icon {
    float: right;
    margin: 18px;
  }
  .station-card h3 {
    font-size: 1.05rem;
  }
  .station-card p {
    font-size: 0.8rem;
    min-height: 35px;
    margin-bottom: 13px;
  }
  .station-icon {
    margin: 18px 0 15px;
  }
  .station-progress {
    font-size: 0.62rem;
  }
  .chapter-flow {
    display: none;
  }
  .lower-deck {
    grid-template-columns: 1fr;
    margin-top: 24px;
  }
  .sera-card img {
    width: 35%;
  }
  .sera-card > div {
    padding: 25px;
  }
  .page-heading {
    flex-direction: column;
    align-items: flex-start;
    margin-top: 10px;
    gap: 10px;
  }
  .page-heading h1 {
    font-size: 2.2rem;
  }
  .briefing {
    gap: 16px;
    padding: 16px;
  }
  .briefing img {
    width: 85px;
    height: 110px;
  }
  .briefing p {
    font-size: 0.91rem;
  }
  .mission-row {
    gap: 17px;
  }
  .mission-row h2 {
    font-size: 1.07rem;
  }
  .lesson-top {
    font-size: 0.7rem;
    gap: 12px;
  }
  .lesson-top > span:nth-child(2) {
    max-width: 48%;
  }
  .lesson-panel {
    grid-template-columns: 1fr;
    min-height: 0;
  }
  .lesson-visual {
    padding: 20px 25px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .diagram {
    max-width: 410px;
    max-height: 210px;
  }
  .diagram-caption {
    font-size: 0.62rem;
    margin-top: 8px;
  }
  .lesson-copy {
    padding: 25px;
  }
  .lesson-copy h1 {
    font-size: 1.8rem;
  }
  .formula {
    font-size: 1.2rem;
    padding: 15px;
  }
  .lesson-controls {
    gap: 15px;
  }
  .lesson-controls .button,
  .lesson-controls button {
    font-size: 0.88rem;
  }
  .panel {
    padding: 23px 20px;
  }
  .task-panel h2 {
    font-size: 1.35rem;
  }
  .task-top {
    gap: 12px;
  }
  .field-row,
  .comparison,
  .settings-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .readings {
    flex-direction: column;
    gap: 5px;
    align-items: center;
  }
  .skill-row {
    font-size: 0.85rem;
  }
  .task-panel .actions button {
    font-size: 0.85rem;
  }
  .worksheet {
    padding: 20px 17px;
  }
  .game-card {
    grid-template-columns: 1fr;
  }
  .game-card > img {
    height: 230px;
  }
  .game-card > div {
    padding: 26px;
  }
  .portal-heading {
    margin: 25px 0 30px;
  }
  .portal-heading h1 {
    font-size: 2.7rem;
  }
  .game-card h2 {
    font-size: 2rem;
  }
  .portal .site-header > .badge {
    display: none;
  }
  footer {
    margin: 0 18px;
    flex-wrap: wrap;
    font-size: 0.5rem;
  }
  footer > span:nth-child(2) {
    display: none;
  }
  .notice {
    font-size: 0.82rem;
  }
  .table-wrap {
    font-size: 0.85rem;
  }
}
@media print {
  body {
    background: #fff;
    color: #111;
    font-size: 12pt;
    line-height: 1.5;
  }
  header,
  footer,
  .no-print,
  .notice,
  .banner,
  .skip-link {
    display: none !important;
  }
  main {
    max-width: none;
    padding: 0;
  }
  .worksheet {
    border: none;
    padding: 0;
    margin: 0;
  }
  .worksheet h2 {
    font-size: 22pt;
  }
  .written-task {
    margin: 25px 0;
    page-break-inside: avoid;
  }
  .writing-space {
    background: none;
    border-bottom: 1px solid #ccc;
    min-height: 160px;
  }
  .muted {
    color: #555;
  }
  .written-solution {
    background: none;
    color: #111;
    border-color: #333;
  }
  .worksheet a {
    color: #111;
  }
  h3 {
    font-size: 14pt;
  }
}
.beacon {
  width: 25px;
  height: 25px;
  background: #536772;
  border: 5px solid #263b49;
  box-shadow: 0 0 0 1px #67818e;
  border-radius: 50%;
  flex-shrink: 0;
}
.beacon.online {
  background: var(--teal);
  box-shadow:
    0 0 16px #6ec8c866,
    0 0 0 1px var(--teal);
}
.system-checks {
  display: flex;
  gap: 12px;
  margin: 25px 0;
}
.system-checks span {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--muted);
}
.system-checks .current {
  border-color: var(--amber);
  color: var(--amber);
}
.system-checks .passed {
  background: #20493f;
  color: var(--teal);
}
.engineering form {
  margin-top: 25px;
}
.engineering #engineering-next {
  margin-top: 24px;
}
.step-dots {
  margin-bottom: 15px;
}
.step-dots a {
  height: 44px;
  background: transparent;
  position: relative;
  display: block;
}
.step-dots a:after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 17px;
  height: 9px;
  background: var(--line);
  border-radius: 2px;
}
.step-dots a.active {
  background: transparent;
}
.step-dots a.active:after {
  background: var(--teal);
}