:root {
  color-scheme: dark;
  --black: #000000;
  --ink: #1a1a1a;
  --red: #ee3f2c;
  --red-bright: #ff5a47;
  --panel: #202020;
  --white: #ffffff;
  --paper: #f4f2ed;
  --line-dark: rgba(0, 0, 0, 0.16);
  --line-light: rgba(255, 255, 255, 0.12);
  --glass: rgba(255, 255, 255, 0.05);
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.24);
  --max: 80rem;
  --gutter: clamp(1.5rem, 4vw, 3rem);
  --section: clamp(4rem, 8vw, 8rem);
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --system: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--black);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 20rem;
  overflow-x: hidden;
  color: var(--white);
  font-family: var(--system);
  font-size: 1rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(90deg, transparent 0 49.9%, rgba(255, 255, 255, 0.025) 50%, transparent 50.1%);
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-underline-offset: 0.2em;
}

p,
li,
input,
button,
summary,
a {
  font-size: 1rem;
}

p {
  max-width: 72ch;
  margin: 0 0 1rem;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.04em;
  text-wrap: balance;
}

h1 {
  max-width: 14ch;
  font-size: clamp(2.5rem, 7vw, 4rem);
  text-transform: uppercase;
}

h2 {
  max-width: 24ch;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  text-transform: uppercase;
}

h3 {
  font-size: 1.25rem;
  letter-spacing: -0.025em;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 100;
  min-height: 2.75rem;
  padding: 0.65rem 1rem;
  transform: translateY(-150%);
  background: var(--white);
  color: var(--black);
  font-weight: 700;
}

.skip-link:focus {
  transform: translateY(0);
}

.utility-strip {
  position: relative;
  z-index: 30;
  display: flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem var(--gutter);
  background: var(--red);
  color: var(--black);
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.utility-strip span:last-child {
  display: none;
}

.site-header {
  position: relative;
  z-index: 25;
  border-bottom: 1px solid var(--line-light);
  background: rgba(0, 0, 0, 0.94);
}

.menu-shell {
  display: flex;
  width: min(100%, var(--max));
  min-height: 4rem;
  margin: 0 auto;
  padding: 0 var(--gutter);
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.wordmark {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  text-decoration: none;
  font-family: var(--mono);
  font-weight: 800;
  letter-spacing: -0.04em;
}

.wordmark span {
  color: var(--red);
}

.menu {
  position: relative;
}

.menu summary {
  display: inline-flex;
  min-width: 4.5rem;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-light);
  border-radius: 0.5rem;
  cursor: pointer;
  font-family: var(--mono);
  font-weight: 700;
  list-style: none;
}

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

.menu-panel {
  position: absolute;
  top: calc(100% + 0.6rem);
  right: 0;
  display: grid;
  width: min(20rem, calc(100vw - 2rem));
  padding: 0.5rem;
  border: 1px solid var(--line-light);
  border-radius: 0.5rem;
  background: var(--ink);
  box-shadow: 0 1.25rem 3rem rgba(0, 0, 0, 0.5);
}

.menu:not([open]) .menu-panel {
  display: none;
}

.menu-panel a {
  display: flex;
  min-height: 2.75rem;
  align-items: center;
  padding: 0.6rem 0.8rem;
  border-radius: 0.35rem;
  text-decoration: none;
  font-weight: 650;
  transition: color 200ms ease, background 200ms ease;
}

.menu-panel a:hover,
.menu-panel a:focus-visible,
.menu-panel a[aria-current="page"] {
  background: var(--red);
  color: var(--black);
}

.content-grid,
.hero-grid {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.hero {
  position: relative;
  display: grid;
  min-height: calc(100svh - 6.75rem);
  overflow: hidden;
  isolation: isolate;
  align-items: center;
  background: var(--ink);
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  opacity: 1;
}

.hero-grid {
  display: grid;
  padding-block: 4rem;
}

.glass-panel {
  width: min(100%, 45rem);
  padding: clamp(1.5rem, 5vw, 3rem);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 0.5rem;
  background: rgba(20, 20, 20, 0.84);
  box-shadow: inset 1px 1px 0 rgba(255, 255, 255, 0.14), inset 0 0 2rem rgba(0, 0, 0, 0.2), var(--shadow);
  backdrop-filter: blur(40px) saturate(180%);
  -webkit-backdrop-filter: blur(40px) saturate(180%);
}

.glass-panel h1 {
  margin-bottom: 1.5rem;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.55);
}

.hero-copy,
.lede {
  max-width: 60ch;
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  line-height: 1.55;
}

.micro-note {
  margin: 1.25rem 0 0;
  font-family: var(--mono);
  font-size: 1rem;
  letter-spacing: 0.03em;
}

.eyebrow,
.card-kicker,
.note-label,
.check-code,
.run-code,
.date-stamp,
.source-card > span,
.price-card > span,
.stop-card > span,
.answer-topic > span,
.study-label,
.footer-mark {
  font-family: var(--mono);
  font-size: 0.875rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1.4;
}

.eyebrow {
  margin-bottom: 0.9rem;
}

.red-text {
  color: var(--red-bright);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.button {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.25rem;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 750;
  line-height: 1.2;
  clip-path: polygon(0 0, calc(100% - 0.75rem) 0, 100% 0.75rem, 100% 100%, 0.75rem 100%, 0 calc(100% - 0.75rem));
  transition: transform 200ms ease, background 200ms ease, color 200ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-red {
  background: var(--red);
  color: var(--black);
}

.button-black {
  background: var(--black);
  color: var(--white);
}

.button-ghost {
  border-color: rgba(255, 255, 255, 0.45);
  background: rgba(0, 0, 0, 0.35);
  color: var(--white);
}

.button-outline-dark {
  border-color: var(--black);
  color: var(--black);
}

.section {
  position: relative;
  padding-block: var(--section);
}

/* Decorative hairlines live on a pseudo-layer so text sits on a plain, measurable colour. */
.section-dark,
.paper-section,
.page-hero,
.error-panel {
  position: relative;
  isolation: isolate;
}

.section-dark::before,
.paper-section::before,
.page-hero::before,
.error-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

.section-dark {
  background: var(--black);
  color: var(--white);
}

.section-dark::before {
  background: linear-gradient(135deg, transparent 0 74%, rgba(238, 63, 44, 0.08) 74.2%, transparent 74.4%);
}

.paper-section {
  background: var(--paper);
  color: var(--black);
}

.paper-section::before {
  background: linear-gradient(90deg, transparent 0 49.9%, rgba(0, 0, 0, 0.04) 50%, transparent 50.1%);
}

.red-section {
  background: var(--red);
  color: var(--black);
}

.split-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.section-copy > h2,
.section-heading > h2 {
  margin-bottom: 1.5rem;
}

.section-heading {
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}

.section-heading > p:last-child {
  margin-bottom: 0;
}

.media-frame {
  margin: 0;
  min-height: 18rem;
  overflow: hidden;
  border: 1px solid var(--line-light);
  border-radius: 0.5rem;
  background:
    linear-gradient(135deg, var(--ink), #090909 60%, rgba(238, 63, 44, 0.38));
  box-shadow: var(--shadow);
}

.media-frame img {
  width: 100%;
  height: 100%;
  min-height: 18rem;
  object-fit: cover;
}

.checklist-grid,
.route-grid,
.evidence-grid,
.glossary-grid,
.price-grid,
.source-grid,
.stop-grid {
  display: grid;
  gap: 1rem;
}

.checklist-grid {
  list-style: none;
}

.check-card,
.evidence-card,
.glossary-card,
.price-card,
.source-card,
.stop-card,
.dark-card,
.note-card,
.worksheet {
  border: 1px solid var(--line-dark);
  border-radius: 0.5rem;
  box-shadow: var(--shadow);
}

.check-card {
  min-height: 16rem;
  padding: 1.5rem;
  background: var(--white);
}

.check-card::before {
  content: "";
  display: block;
  width: 3rem;
  height: 0.35rem;
  margin-bottom: 2rem;
  background: var(--red);
}

.check-card h3,
.glossary-card h3,
.price-card h3 {
  margin: 0.7rem 0 0.8rem;
}

.route-grid {
  grid-template-columns: 1fr;
}

.route-card {
  display: grid;
  min-height: 12rem;
  padding: 1.5rem;
  border: 1px solid var(--line-light);
  border-radius: 0.5rem;
  background: var(--ink);
  text-decoration: none;
  transition: border 200ms ease, transform 200ms ease, background 200ms ease;
}

.route-card:hover,
.route-card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--red);
  background: #242424;
}

.route-card span,
.route-card em {
  font-family: var(--mono);
  font-size: 1rem;
  font-style: normal;
  font-weight: 750;
}

.route-card span {
  color: var(--red-bright);
}

.route-card strong {
  align-self: center;
  font-size: 1.35rem;
  line-height: 1.15;
}

.route-card em {
  align-self: end;
}

.page-hero {
  padding-block: clamp(4rem, 10vw, 7rem);
  border-bottom: 1px solid var(--line-light);
  background: var(--ink);
}

.page-hero::before {
  background: linear-gradient(130deg, transparent 65%, rgba(238, 63, 44, 0.22) 65.2%, transparent 65.4%);
}

.compact-hero {
  min-height: 29rem;
  display: flex;
  align-items: center;
}

.page-hero-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.page-hero h1 {
  margin-bottom: 1.5rem;
}

.page-hero .media-frame {
  max-height: 32rem;
}

.note-card,
.worksheet {
  padding: clamp(1.5rem, 4vw, 2.25rem);
  border-color: var(--line-light);
  background: var(--panel);
  box-shadow: inset 1px 1px 0 rgba(255, 255, 255, 0.12), inset 0 0 2rem rgba(0, 0, 0, 0.2), var(--shadow);
  backdrop-filter: blur(24px) saturate(150%);
  -webkit-backdrop-filter: blur(24px) saturate(150%);
}

.paper-section .note-card,
.paper-section .worksheet {
  border-color: var(--line-dark);
  background: var(--white);
}

.note-card h3,
.worksheet h3 {
  margin: 0.6rem 0 1rem;
  font-size: 1.65rem;
}

.two-up,
.three-up {
  grid-template-columns: 1fr;
}

.evidence-card,
.dark-card {
  padding: clamp(1.5rem, 4vw, 2.25rem);
}

.evidence-card {
  background: var(--white);
}

.evidence-card h2,
.dark-card h2 {
  margin: 0.75rem 0 1.2rem;
  font-size: 1.75rem;
}

.red-card {
  border-color: var(--red);
  background: var(--red);
}

.dark-card {
  border-color: var(--line-light);
  background: var(--ink);
}

.dark-card h3 {
  margin: 0.75rem 0 1rem;
  font-size: 1.4rem;
}

.callout-bar {
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  border-left: 0.5rem solid var(--red);
  background: var(--black);
  color: var(--white);
  font-size: 1rem;
  font-weight: 700;
}

.filter-box {
  display: grid;
  gap: 0.5rem;
  max-width: 40rem;
  margin-bottom: 2rem;
}

.filter-box label {
  font-family: var(--mono);
  font-weight: 800;
}

.filter-box input {
  width: 100%;
  min-height: 3.25rem;
  padding: 0.75rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.38);
  border-radius: 0.5rem;
  outline: none;
  background: var(--ink);
  color: var(--white);
}

.filter-box input:focus {
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(238, 63, 44, 0.28);
}

.filter-status {
  margin: 0;
  color: #d8d8d8;
}

.glossary-card {
  padding: 1.5rem;
  border-color: var(--line-light);
  background: var(--ink);
}

.glossary-card[hidden] {
  display: none;
}

.run-list {
  display: grid;
  list-style: none;
  border-top: 1px solid var(--line-dark);
}

.run-item {
  display: grid;
  gap: 1rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line-dark);
}

.run-item h3 {
  margin-top: 0.4rem;
  font-size: 1.4rem;
}

.run-item p {
  margin: 0;
}

.text-link {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
  color: var(--red-bright);
  font-weight: 800;
}

.dark-link {
  color: var(--black);
}

.answer-stack {
  display: grid;
  gap: 1rem;
}

.answer-row {
  display: grid;
  gap: 1rem;
  padding: 1.25rem;
  border: 1px solid var(--line-dark);
  border-radius: 0.5rem;
  background: var(--white);
  box-shadow: var(--shadow);
}

.answer-topic h3 {
  margin-top: 0.5rem;
}

.answer-good,
.answer-weak {
  min-height: 8rem;
  padding: 1rem;
  border-radius: 0.35rem;
}

.answer-good {
  background: var(--black);
  color: var(--white);
}

.answer-weak {
  border: 1px solid var(--line-dark);
  background: #ece9e2;
}

.answer-good b,
.answer-weak b {
  font-family: var(--mono);
  font-size: 1rem;
}

.answer-good p,
.answer-weak p {
  margin: 0.65rem 0 0;
}

.price-card {
  min-height: 18rem;
  padding: 1.5rem;
  background: var(--white);
}

.price-card > p:first-of-type {
  margin-top: 2rem;
  font-size: 1.1rem;
  font-weight: 750;
}

.feature-price {
  background: var(--red);
}

.date-stamp {
  margin-top: 1.25rem;
  font-size: 1rem;
}

.check-list {
  display: grid;
  gap: 0.65rem;
  margin-top: 1.5rem;
  list-style: none;
}

.check-list li {
  position: relative;
  min-height: 2.75rem;
  padding: 0.55rem 0 0.55rem 1.75rem;
}

.check-list li::before {
  content: "";
  position: absolute;
  top: 1.15rem;
  left: 0;
  width: 0.65rem;
  height: 0.65rem;
  background: var(--red);
  clip-path: polygon(0 0, 100% 0, 100% 60%, 60% 100%, 0 100%);
}

.worksheet hr {
  margin: 1.5rem 0;
  border: 0;
  border-top: 1px solid var(--line-light);
}

.field-strip {
  display: grid;
  gap: 0.5rem;
  list-style: none;
}

.field-strip li {
  min-height: 3.25rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line-dark);
  background: var(--white);
  line-height: 1.45;
}

.field-strip b {
  display: block;
  font-family: var(--mono);
  font-weight: 800;
}

.max-copy {
  margin-top: 1.5rem;
}

.evidence-stack {
  display: grid;
  gap: 1rem;
}

.study-card {
  display: grid;
  gap: 1.5rem;
  padding: 1.5rem;
  border: 1px solid var(--line-dark);
  border-radius: 0.5rem;
  background: var(--white);
  box-shadow: var(--shadow);
}

.study-label {
  display: flex;
  min-height: 7rem;
  flex-direction: column;
  justify-content: space-between;
  padding: 1rem;
  background: var(--red);
}

.study-card h3 {
  margin-bottom: 1rem;
  font-size: 1.55rem;
}

.study-limit {
  padding-left: 1rem;
  border-left: 0.3rem solid var(--red);
}

.source-card {
  display: flex;
  min-height: 15rem;
  flex-direction: column;
  padding: 1.5rem;
  background: var(--white);
  color: var(--black);
  text-decoration: none;
  transition: transform 200ms ease, border 200ms ease;
}

.source-card:hover,
.source-card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--red);
}

.source-card strong {
  margin: 1rem 0 0.6rem;
  font-size: 1.35rem;
  line-height: 1.15;
}

.source-card p {
  margin-bottom: 1rem;
}

.source-card em {
  margin-top: auto;
  font-size: 1rem;
  font-style: normal;
  font-weight: 800;
}

.dark-sources .source-card {
  border-color: var(--line-light);
  background: var(--ink);
  color: var(--white);
}

.stop-card {
  min-height: 15rem;
  padding: 1.5rem;
  border-color: rgba(0, 0, 0, 0.45);
  background: var(--black);
  color: var(--white);
}

.stop-card > span {
  color: var(--red);
}

.stop-card p {
  margin-top: 2rem;
  font-weight: 700;
}

.final-checks {
  display: grid;
  gap: 0;
  list-style: none;
  border-top: 1px solid var(--line-dark);
}

.final-checks li {
  min-height: 3.5rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line-dark);
}

.next-panel {
  padding-block: 2.5rem;
  border-top: 1px solid var(--line-light);
  background: var(--ink);
}

.next-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: flex-start;
  justify-content: space-between;
}

.next-grid h2 {
  font-size: clamp(1.5rem, 4vw, 2.4rem);
}

.red-section .next-grid {
  padding-inline: var(--gutter);
}

.site-footer {
  padding-block: 3rem;
  border-top: 1px solid var(--line-light);
  background: var(--black);
}

.footer-grid {
  display: grid;
  width: min(100%, var(--max));
  gap: 2rem;
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.footer-mark {
  display: block;
  margin-bottom: 0.8rem;
  color: var(--red);
}

.footer-grid p {
  margin: 0;
  font-size: 1rem;
}

.footer-links {
  display: grid;
  gap: 0.25rem;
}

.footer-links a {
  display: flex;
  min-height: 2.75rem;
  align-items: center;
  font-size: 1rem;
  font-weight: 700;
}

.error-panel {
  display: flex;
  min-height: 65svh;
  align-items: center;
  background: var(--ink);
}

.error-panel::before {
  background: linear-gradient(135deg, transparent 55%, rgba(238, 63, 44, 0.3) 55.2%, transparent 55.4%);
}

.error-panel h1 {
  margin-bottom: 1.5rem;
}

.reveal {
  animation: rise-in 420ms ease-out both;
}

.reveal:nth-child(2) {
  animation-delay: 80ms;
}

.reveal:nth-child(3) {
  animation-delay: 160ms;
}

.reveal:nth-child(4) {
  animation-delay: 240ms;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(1rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 40rem) {
  .utility-strip span:last-child {
    display: inline;
  }

  .checklist-grid,
  .route-grid,
  .glossary-grid,
  .source-grid,
  .stop-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .run-item {
    grid-template-columns: minmax(13rem, 0.8fr) minmax(0, 1.2fr);
  }

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

  .study-card {
    grid-template-columns: 10rem minmax(0, 1fr);
  }

  .next-grid {
    flex-direction: row;
    align-items: center;
  }
}

@media (min-width: 48rem) {
  .menu-shell {
    align-items: flex-start;
    padding-top: 0.65rem;
  }

  .menu {
    width: min(63rem, calc(100% - 10rem));
  }

  .menu summary {
    display: none;
  }

  .menu .menu-panel,
  .menu:not([open]) .menu-panel {
    position: static;
    display: flex;
    width: auto;
    flex-wrap: wrap;
    justify-content: flex-end;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
  }

  .menu-panel a {
    padding-inline: 0.65rem;
  }

  .split-grid,
  .page-hero-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(2rem, 7vw, 6rem);
  }

  .reverse > :first-child {
    order: 2;
  }

  .reverse > :last-child {
    order: 1;
  }

  .hero-grid {
    justify-items: end;
  }

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

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

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

  .three-up,
  .three-source,
  .price-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .answer-row {
    grid-template-columns: minmax(12rem, 0.8fr) repeat(2, minmax(0, 1fr));
    align-items: stretch;
  }

  .footer-grid {
    grid-template-columns: 1.4fr 1fr;
    align-items: start;
  }
}

@media (min-width: 72rem) {
  .field-strip {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

  .three-source {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
  }
}