:root {
  --color-canvas: #081116;
  --color-surface: #0e191f;
  --color-surface-raised: #13232b;
  --color-surface-soft: #172830;
  --color-border: #263941;
  --color-border-strong: #45606b;
  --color-text: #f4f7f8;
  --color-text-muted: #a9bac1;
  --color-accent: #edae49;
  --color-accent-strong: #ffd078;
  --color-accent-soft: #302516;
  --color-success: #70d99b;
  --color-success-soft: #122d22;
  --color-info: #72c7e7;
  --color-info-soft: #102b37;
  --color-danger: #ff8b82;
  --color-danger-soft: #351a1b;
  --radius-sm: 0.45rem;
  --radius-md: 0.8rem;
  --radius-lg: 1.1rem;
  --shadow-card: 0 1.5rem 4rem rgb(0 0 0 / 24%);
  --shadow-header: 0 0.8rem 2.5rem rgb(0 0 0 / 18%);
  --content-width: 108rem;
  --header-height: 5rem;
}

[hidden] {
  display: none !important;
}

body {
  background:
    radial-gradient(circle at 78% 8%, rgb(114 199 231 / 8%), transparent 28rem),
    linear-gradient(rgb(255 255 255 / 2%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(255 255 255 / 2%) 1px, transparent 1px),
    var(--color-canvas);
  background-attachment: fixed;
  background-size: auto, 4rem 4rem, 4rem 4rem, auto;
  text-rendering: optimizelegibility;
}

body::before {
  position: fixed;
  z-index: 60;
  inset: 0 0 auto;
  height: 0.15rem;
  background: linear-gradient(90deg, var(--color-accent), var(--color-info) 45%, transparent 82%);
  content: "";
  pointer-events: none;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.site-header {
  position: sticky;
  z-index: 40;
  top: 0.15rem;
  min-height: var(--header-height);
  border-bottom-color: rgb(69 96 107 / 62%);
  background: rgb(8 17 22 / 88%);
  box-shadow: var(--shadow-header);
  backdrop-filter: blur(1rem);
}

.brand__mark {
  position: relative;
  overflow: hidden;
  border-color: rgb(237 174 73 / 72%);
  background: var(--color-accent-soft);
  box-shadow: inset 0 0 0 1px rgb(255 208 120 / 6%);
}

.brand__mark::after {
  position: absolute;
  right: -0.2rem;
  bottom: -0.2rem;
  width: 0.7rem;
  aspect-ratio: 1;
  transform: rotate(45deg);
  background: var(--color-accent);
  content: "";
}

.brand small {
  color: #81969f;
}

.nav-toggle {
  display: inline-flex;
  min-height: 2.65rem;
  gap: var(--space-2);
  align-items: center;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.78rem;
  font-weight: 750;
}

.nav-toggle > span:first-child {
  width: 0.5rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 0.2rem var(--color-accent-soft);
}

.site-nav {
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  width: min(18rem, calc(100vw - 2rem));
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-raised);
  box-shadow: var(--shadow-card);
}

.site-nav[data-open="true"] {
  display: grid;
}

.site-nav a {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
}

.site-nav a:hover {
  background: var(--color-surface-soft);
}

.account-button {
  min-height: 2.35rem;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 750;
  cursor: pointer;
}

.account-button:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.site-nav__action {
  border: 1px solid var(--color-accent);
  color: var(--color-accent-strong) !important;
}

.hero {
  position: relative;
  min-height: min(58rem, calc(100svh - var(--header-height)));
  padding-block: clamp(5rem, 11vw, 9rem);
}

.hero::after {
  position: absolute;
  z-index: -1;
  top: var(--space-7);
  right: 0;
  color: rgb(169 186 193 / 15%);
  content: "ROUTE / 01—16";
  font-family: var(--font-mono);
  font-size: clamp(3rem, 8vw, 8rem);
  font-weight: 900;
  letter-spacing: -0.08em;
  line-height: 1;
  pointer-events: none;
}

.hero__content {
  position: relative;
}

.hero h1 {
  max-width: 70rem;
  font-size: clamp(3.15rem, 8vw, 7.6rem);
  letter-spacing: -0.07em;
}

.hero h1 em {
  position: relative;
  color: var(--color-accent-strong);
}

.hero h1 em::after {
  position: absolute;
  right: 0.04em;
  bottom: -0.06em;
  left: 0.04em;
  height: 0.08em;
  background: var(--color-accent);
  content: "";
  opacity: 0.45;
}

.hero__lead {
  max-width: 53rem;
  color: #b7c5ca;
}

.button {
  border-radius: var(--radius-sm);
  letter-spacing: -0.01em;
}

.button--primary {
  box-shadow: 0 0.65rem 1.8rem rgb(237 174 73 / 14%);
}

.button--danger {
  border-color: #9b4543;
  background: var(--color-danger-soft);
  color: var(--color-danger);
}

.button--danger:hover {
  border-color: var(--color-danger);
  background: #432021;
}

.route-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 40rem;
  margin-top: var(--space-7);
  border-block: 1px solid var(--color-border);
}

.route-facts div {
  padding: var(--space-3) var(--space-4);
}

.route-facts div + div {
  border-left: 1px solid var(--color-border);
}

.route-facts dt {
  color: var(--color-text-muted);
  font-size: 0.68rem;
  text-transform: uppercase;
}

.route-facts dd {
  margin-top: var(--space-1);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: clamp(0.9rem, 2vw, 1.15rem);
  font-weight: 800;
}

.hero-status {
  position: relative;
  overflow: hidden;
  padding: clamp(1.25rem, 3vw, 2rem);
  border-color: rgb(69 96 107 / 72%);
  border-top-width: 0.2rem;
  background:
    linear-gradient(145deg, rgb(114 199 231 / 5%), transparent 48%),
    var(--color-surface);
}

.hero-status::after {
  position: absolute;
  right: -2rem;
  bottom: -2rem;
  width: 7rem;
  aspect-ratio: 1;
  border: 1px solid rgb(114 199 231 / 12%);
  border-radius: 50%;
  content: "";
}

.hero-status__body {
  display: grid;
  gap: var(--space-5);
  align-items: center;
  padding-block: var(--space-5);
}

.progress-ring {
  --progress: 0;
  position: relative;
  display: flex;
  width: 9.5rem;
  aspect-ratio: 1;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-inline: auto;
  border-radius: 50%;
  background:
    radial-gradient(circle, var(--color-surface) 62%, transparent 64%),
    conic-gradient(
      var(--color-accent) calc(var(--progress) * 3.6deg),
      var(--color-border) 0
    );
}

.progress-ring::after {
  position: absolute;
  width: 70%;
  aspect-ratio: 1;
  border: 1px solid rgb(69 96 107 / 45%);
  border-radius: 50%;
  content: "";
}

.progress-ring strong,
.progress-ring span {
  position: relative;
  z-index: 1;
}

.progress-ring strong {
  font-family: var(--font-mono);
  font-size: 1.7rem;
  line-height: 1;
}

.progress-ring span {
  margin-top: var(--space-1);
  color: var(--color-text-muted);
  font-size: 0.65rem;
  text-transform: uppercase;
}

.hero-status .metric-grid {
  grid-template-columns: 1fr;
  margin: 0;
}

.hero-status .metric-grid div {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-3);
  align-items: baseline;
  padding: var(--space-3) 0;
  border-right: 0;
}

.hero-status .metric-grid dd {
  max-width: 13rem;
  overflow: hidden;
  font-size: 0.9rem;
  text-align: right;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.progress {
  position: relative;
  z-index: 1;
  height: 0.38rem;
  background: #1c2b32;
}

.progress span {
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-strong));
}

.section {
  position: relative;
  padding-block: clamp(4.5rem, 8vw, 8rem);
}

.section-heading__aside {
  display: grid;
  gap: var(--space-3);
  align-items: start;
}

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

.text-action {
  width: fit-content;
  padding: 0;
  border: 0;
  border-bottom: 1px solid currentcolor;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 0.78rem;
}

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

.text-action--danger {
  color: var(--color-danger);
}

.next-module {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 4vw, 3rem);
  border-left-width: 0.35rem;
  background:
    linear-gradient(115deg, rgb(237 174 73 / 8%), transparent 45%),
    var(--color-surface);
  box-shadow: 0 1.5rem 4rem rgb(0 0 0 / 12%);
}

.next-module::after {
  position: absolute;
  top: 0;
  right: 0;
  width: 7rem;
  height: 100%;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0 0.7rem,
    rgb(255 255 255 / 2%) 0.7rem 0.8rem
  );
  content: "";
  pointer-events: none;
}

.next-module > * {
  position: relative;
  z-index: 1;
}

.next-module__index {
  color: rgb(255 208 120 / 46%);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1;
}

.next-module__content h3 {
  margin-top: var(--space-2);
  font-size: clamp(1.35rem, 3vw, 2rem);
}

.phase-overview {
  margin-top: var(--space-7);
  padding-top: var(--space-7);
  border-top: 1px solid var(--color-border);
}

.phase-overview__header {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.phase-overview__header h3 {
  margin-top: var(--space-2);
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.phase-overview__header > p {
  max-width: 38rem;
  color: var(--color-text-muted);
}

.phase-grid {
  display: grid;
  gap: var(--space-3);
}

.phase-card {
  min-width: 0;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: rgb(14 25 31 / 72%);
}

.phase-card header {
  display: flex;
  gap: var(--space-3);
  align-items: start;
  justify-content: space-between;
}

.phase-card__number,
.phase-card__count,
.phase-card__meta {
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.phase-card__number {
  color: var(--color-accent-strong);
  font-weight: 800;
  text-transform: uppercase;
}

.phase-card h4 {
  margin-top: var(--space-1);
  font-size: 0.95rem;
}

.phase-card__count {
  flex-shrink: 0;
  color: var(--color-text);
}

.phase-card__progress,
.module-card__progress {
  overflow: hidden;
  height: 0.25rem;
  margin-block: var(--space-4);
  border-radius: 99rem;
  background: var(--color-border);
}

.phase-card__progress span,
.module-card__progress span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--color-success);
  transition: width 350ms ease;
}

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

.filters {
  border-color: rgb(69 96 107 / 68%);
  background: rgb(14 25 31 / 92%);
  box-shadow: 0 1rem 3rem rgb(0 0 0 / 12%);
}

.field label {
  color: #b9c6cb;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.field input,
.field select {
  border-color: var(--color-border);
  background: #091318;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.field input:hover,
.field select:hover {
  border-color: var(--color-border-strong);
}

.field input:focus,
.field select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 0.2rem rgb(237 174 73 / 10%);
}

.module-grid {
  align-items: stretch;
}

.module-card {
  position: relative;
  overflow: hidden;
  min-height: 34rem;
  border-color: rgb(38 57 65 / 92%);
  background:
    linear-gradient(160deg, rgb(114 199 231 / 3%), transparent 32%),
    var(--color-surface);
  box-shadow: 0 1rem 2.5rem rgb(0 0 0 / 10%);
}

.module-card::before {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0.16rem;
  background: var(--color-border);
  content: "";
}

.module-card[data-status="available"]::before {
  background: var(--color-info);
}

.module-card[data-status="completed"]::before {
  background: var(--color-success);
}

.module-card[data-completed="true"] {
  border-color: rgb(112 217 155 / 42%);
  background:
    linear-gradient(160deg, rgb(112 217 155 / 5%), transparent 38%),
    var(--color-surface);
}

.module-card:hover {
  border-color: var(--color-border-strong);
  box-shadow: 0 1.4rem 3.2rem rgb(0 0 0 / 20%);
}

.module-card__order {
  color: rgb(169 186 193 / 34%);
  font-size: 2.2rem;
  letter-spacing: -0.07em;
}

.module-card__track {
  color: var(--color-info);
}

.module-card__title {
  font-size: clamp(1.3rem, 2vw, 1.55rem);
}

.module-card__description {
  line-height: 1.65;
}

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

.module-card__meta div {
  min-width: 0;
}

.module-card__meta div + div {
  padding-left: var(--space-3);
  border-left: 1px solid var(--color-border);
}

.module-card__meta dd {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.module-card__progress {
  margin: var(--space-2) 0 var(--space-4);
}

.module-card__progress-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-top: calc(var(--space-5) * -1);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.module-card__progress-row strong {
  color: var(--color-accent-strong);
}

.module-card__link {
  margin-top: auto;
}

.module-details {
  margin-bottom: var(--space-4);
}

.completion-control {
  min-height: 2.6rem;
}

.method-grid {
  counter-reset: method-step;
}

.method-grid li {
  position: relative;
  overflow: hidden;
  min-height: 15rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.method-grid li::after {
  position: absolute;
  right: -0.15em;
  bottom: -0.35em;
  color: rgb(169 186 193 / 5%);
  content: attr(data-step);
  font-family: var(--font-mono);
  font-size: 7rem;
  font-weight: 900;
  line-height: 1;
}

.project-card {
  position: relative;
  overflow: hidden;
  border-color: rgb(38 57 65 / 92%);
  background:
    linear-gradient(145deg, rgb(114 199 231 / 3%), transparent 45%),
    var(--color-surface);
}

.project-card::after {
  position: absolute;
  right: -3rem;
  bottom: -3rem;
  width: 8rem;
  aspect-ratio: 1;
  border: 1px solid rgb(114 199 231 / 10%);
  transform: rotate(45deg);
  content: "";
}

.project-card--featured {
  border-color: rgb(237 174 73 / 42%);
  background:
    linear-gradient(145deg, rgb(237 174 73 / 10%), transparent 50%),
    var(--color-surface);
}

.reset-dialog {
  width: min(calc(100% - 2rem), 34rem);
  padding: 0;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  background: var(--color-surface-raised);
  color: var(--color-text);
  box-shadow: 0 2rem 8rem rgb(0 0 0 / 60%);
}

.reset-dialog::backdrop {
  background: rgb(2 7 9 / 78%);
  backdrop-filter: blur(0.25rem);
}

.reset-dialog form {
  padding: clamp(1.5rem, 5vw, 2.5rem);
}

.reset-dialog h2 {
  margin-block: var(--space-3) var(--space-4);
  font-size: clamp(1.65rem, 5vw, 2.4rem);
}

.reset-dialog form > p:not(.overline) {
  color: var(--color-text-muted);
}

.reset-dialog__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: flex-end;
  margin-top: var(--space-6);
}

.account-dialog {
  width: min(calc(100% - 2rem), 32rem);
  padding: clamp(1.5rem, 5vw, 2.25rem);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  background: var(--color-surface-raised);
  color: var(--color-text);
  box-shadow: 0 2rem 8rem rgb(0 0 0 / 60%);
}

.account-dialog::backdrop {
  background: rgb(2 7 9 / 78%);
  backdrop-filter: blur(0.25rem);
}

.account-dialog__header,
.module-header__actions,
.account-dialog__actions {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  justify-content: space-between;
}

.account-dialog__header {
  margin-bottom: var(--space-5);
}

.account-dialog h2 {
  margin-top: var(--space-2);
  font-size: clamp(1.65rem, 5vw, 2.35rem);
}

.account-dialog section > p {
  color: var(--color-text-muted);
}

.account-dialog__close {
  width: 2.5rem;
  aspect-ratio: 1;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: transparent;
  color: var(--color-text);
  font-size: 1.4rem;
  cursor: pointer;
}

.account-form {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.account-form label {
  color: var(--color-text-muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.account-form input {
  width: 100%;
  min-height: 2.8rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
  color: var(--color-text);
}

.account-dialog__actions {
  flex-wrap: wrap;
  justify-content: flex-start;
  margin-top: var(--space-5);
}

.account-feedback {
  min-height: 1.5rem;
  margin-top: var(--space-5);
  color: var(--color-accent-strong);
  font-size: 0.82rem;
}

/* Module reading experience */
.reading-progress {
  position: fixed;
  z-index: 80;
  inset: 0 0 auto;
  height: 0.18rem;
  background: #15252c;
}

.reading-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-info));
  transition: width 100ms linear;
}

.module-header {
  top: 0.18rem;
}

.back-link {
  display: inline-flex;
  min-height: 2.6rem;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.back-link:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.module-page,
.module-error {
  width: min(calc(100% - 2rem), var(--content-width));
}

.breadcrumbs {
  padding-block: var(--space-4);
}

.module-hero {
  position: relative;
  overflow: hidden;
  min-height: 36rem;
  padding-block: clamp(4rem, 8vw, 7rem);
}

.module-hero::after {
  position: absolute;
  z-index: -1;
  right: 0;
  bottom: 1rem;
  color: rgb(169 186 193 / 8%);
  content: attr(data-module);
  font-family: var(--font-mono);
  font-size: 10rem;
  font-weight: 900;
  line-height: 1;
}

.module-hero h1 {
  font-size: clamp(3rem, 7vw, 6.8rem);
  letter-spacing: -0.065em;
}

.module-summary {
  border-color: rgb(69 96 107 / 72%);
  border-top-width: 0.2rem;
  background:
    linear-gradient(145deg, rgb(237 174 73 / 5%), transparent 48%),
    var(--color-surface);
  box-shadow: var(--shadow-card);
}

.module-summary dl div {
  min-width: 0;
}

.module-summary dd {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.module-layout {
  border-top-color: var(--color-border-strong);
}

.module-toc ol {
  display: flex;
  gap: var(--space-2);
  padding: 0 0 var(--space-3);
  overflow-x: auto;
  list-style: none;
  scrollbar-color: var(--color-border-strong) transparent;
}

.module-toc li {
  flex: 0 0 auto;
}

.module-toc a {
  display: block;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: 99rem;
  background: var(--color-surface);
  color: var(--color-text-muted);
}

.module-toc a:hover,
.module-toc a[aria-current="location"] {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
}

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

.lesson-index {
  max-width: 60rem;
  margin-bottom: var(--space-6);
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.lesson-index ol {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-4);
  list-style: none;
  counter-reset: none;
}

.lesson-index a {
  display: block;
  padding-block: var(--space-2);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
  text-decoration: none;
}

.lesson-index a:hover {
  color: var(--color-accent-strong);
}

.lesson-content {
  gap: var(--space-6);
}

.lesson-block {
  position: relative;
  overflow: hidden;
  max-width: 66rem;
  padding: clamp(1.4rem, 4vw, 3rem);
  border-color: rgb(38 57 65 / 92%);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(155deg, rgb(114 199 231 / 3%), transparent 32%),
    var(--color-surface);
  box-shadow: 0 1.25rem 3rem rgb(0 0 0 / 10%);
  scroll-margin-top: 6rem;
}

.lesson-block::before {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0.18rem;
  background: var(--color-info);
  content: "";
}

.lesson-block__title {
  max-width: 50rem;
  font-size: clamp(1.45rem, 3vw, 2.05rem);
}

.lesson-text,
.lesson-list {
  color: #b6c3c8;
  font-size: 1rem;
  line-height: 1.78;
}

.code-block {
  border-color: #30464f;
  border-radius: var(--radius-md);
  box-shadow: inset 0 0 0 1px rgb(255 255 255 / 1%);
}

.code-block__header {
  background: #13242b;
}

.code-block__copy {
  min-width: 4.6rem;
  background: #0b161b;
}

.code-block pre {
  scrollbar-color: var(--color-border-strong) var(--color-canvas);
}

.callout {
  border-radius: var(--radius-md);
}

.exercise-card,
.resource-card,
.prerequisite-panel,
.tool-panel,
.module-project {
  border-color: rgb(38 57 65 / 92%);
  background: var(--color-surface);
}

.exercise-card {
  scroll-margin-top: 6rem;
}

.exercise-card--guided {
  padding: clamp(1.4rem, 4vw, 2.5rem);
}

.resource-card {
  transition: border-color var(--transition), transform var(--transition);
}

.resource-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-info);
}

.module-pagination a {
  position: relative;
  overflow: hidden;
  min-height: 8rem;
  padding: var(--space-5);
  background: var(--color-surface);
  transition: border-color var(--transition), background var(--transition);
}

.module-pagination a:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

@media (min-width: 40rem) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    display: flex;
    width: auto;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  .site-nav a {
    padding: var(--space-2);
  }

  .site-nav .account-button {
    min-height: auto;
    padding: var(--space-2);
  }

  .hero-status__body {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .phase-overview__header {
    grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.55fr);
    align-items: end;
  }

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

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

  .filters .field--search {
    grid-column: 1 / -1;
  }

  .filters .button {
    width: fit-content;
  }

  .module-page,
  .module-error {
    width: min(calc(100% - 4rem), var(--content-width));
  }

  .lesson-index ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-5);
  }
}

@media (min-width: 64rem) {
  .filters {
    position: sticky;
    z-index: 20;
    top: calc(var(--header-height) + var(--space-3));
    grid-template-columns: minmax(14rem, 2fr) repeat(3, minmax(8.5rem, 1fr)) auto;
  }

  .filters .field--search {
    grid-column: auto;
  }

  .phase-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .module-layout {
    grid-template-columns: 17rem minmax(0, 1fr);
    gap: clamp(3rem, 6vw, 7rem);
  }

  .module-toc {
    overflow: visible;
  }

  .module-toc nav {
    top: calc(var(--header-height) + var(--space-5));
  }

  .module-toc ol {
    display: grid;
    gap: var(--space-1);
    padding: 0;
    overflow: visible;
  }

  .module-toc li {
    min-width: 0;
  }

  .module-toc a {
    padding: var(--space-2) var(--space-3);
    border-color: transparent;
    border-radius: var(--radius-sm);
    background: transparent;
  }

  .module-toc a[aria-current="location"] {
    border-color: var(--color-border);
    border-left-color: var(--color-accent);
  }
}

@media (min-width: 88rem) {
  .phase-grid {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }
}

@media (max-width: 39.99rem) {
  .site-header {
    width: calc(100% - 2rem);
  }

  .brand small {
    display: none;
  }

  .route-facts div {
    padding-inline: var(--space-2);
  }

  .route-facts dt {
    font-size: 0.58rem;
  }

  .next-module .button {
    width: 100%;
  }

  .module-header .brand > span:last-child {
    display: none;
  }

  .module-header__actions {
    gap: var(--space-2);
  }

  .back-link {
    font-size: 0.78rem;
  }

  .module-hero {
    min-height: auto;
  }
}

@media (forced-colors: active) {
  .progress-ring {
    border: 0.4rem solid CanvasText;
    background: Canvas;
  }

  .module-card::before,
  .lesson-block::before {
    background: Highlight;
  }
}

@media print {
  :root {
    color-scheme: light;
  }

  body {
    min-width: 0;
    background: white;
    color: black;
  }

  body::before,
  .site-header,
  .reading-progress,
  .account-dialog,
  .account-button,
  .module-toc,
  .module-pagination,
  .site-footer,
  .completion-control,
  .storage-feedback,
  .code-block__copy {
    display: none !important;
  }

  .module-page {
    width: 100%;
  }

  .module-hero {
    min-height: 0;
    padding-block: 1rem 2rem;
  }

  .module-layout {
    display: block;
  }

  .lesson-section,
  .lesson-block,
  .exercise-card,
  .resource-card,
  .prerequisite-panel,
  .tool-panel,
  .module-project,
  .callout,
  .code-block {
    border-color: #aaa;
    background: white;
    box-shadow: none;
    break-inside: avoid;
  }

  .lesson-text,
  .lesson-list,
  .section-intro,
  .module-hero__lead,
  .exercise-card p,
  .resource-card p {
    color: #222;
  }

  .code-block code {
    color: black;
  }
}