:root {
  --page-bg: #FFFFFF;
  --bg-deep: #0B1F1A;
  --bg-deep-2: #122A22;
  --bg-mist: #F3F6F4;
  --text-main: #0B1F1A;
  --text-on-dark: #FFFFFF;
  --text-muted: #A0B0A7;
  --line: #2A4038;
  --line-light: #DCE3DE;
  --accent: #D4FF00;
  --accent-dim: #A3C400;
  --success: #00E07F;
  --warning: #FFC700;
  --signal-red: #FF5A5A;
  --font-display: "DIN Condensed", "Arial Narrow", "Roboto Condensed", sans-serif;
  --font-body: "Inter", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", "SFMono-Regular", Consolas, monospace;
  --content-max: 1440px;
  --page-gutter: clamp(1rem, 3vw, 3rem);
  --radius: 1rem;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--page-bg);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
}

p {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
}

button {
  font: inherit;
}

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

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 1000;
  background: var(--accent);
  color: var(--bg-deep);
  padding: 0.7rem 1.1rem;
  font-family: var(--font-body);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-220%);
  transition: transform 0.2s var(--ease);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(180deg, rgba(11, 31, 26, 0.98), rgba(11, 31, 26, 0.94));
  color: var(--text-on-dark);
  border-bottom: 1px solid rgba(212, 255, 0, 0.12);
}

.header-shell {
  position: relative;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0.85rem var(--page-gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--text-on-dark);
}

.brand-symbol {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 2px solid var(--accent);
  background: rgba(212, 255, 0, 0.06);
  color: var(--accent);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.05em;
}

.brand-text {
  font-family: var(--font-display);
  font-size: 1.55rem;
  line-height: 1;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.brand-note {
  display: block;
  margin-top: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: clamp(0.35rem, 1.2vw, 1.35rem);
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 0.45rem 0.15rem;
  color: #E6EFE9;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  letter-spacing: 0.02em;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 100%;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link[aria-current="page"] {
  color: var(--accent);
}

.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.65rem;
  background: transparent;
  border: 1px solid rgba(212, 255, 0, 0.4);
  color: var(--text-on-dark);
  cursor: pointer;
}

.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.nav-toggle__icon {
  position: relative;
  width: 1rem;
  height: 0.7rem;
  border-top: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
}

.nav-toggle__icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transform: translateY(-50%);
}

.nav-toggle[aria-expanded="true"] {
  background: rgba(212, 255, 0, 0.08);
  border-color: var(--accent);
}

.header-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #E3FF60);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
  z-index: 101;
}

.site-footer {
  margin-top: auto;
  background: linear-gradient(155deg, #081713 0%, #0B1F1A 45%, #06100D 100%);
  color: var(--text-on-dark);
  border-top: 1px solid rgba(212, 255, 0, 0.12);
}

.footer-main {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: clamp(3rem, 6vw, 5.5rem) var(--page-gutter) 2.5rem;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1.5rem, 4vw, 4rem);
}

.footer-brand {
  grid-column: span 5;
}

.footer-column {
  grid-column: span 3;
}

.footer-wordmark {
  display: inline-block;
  font-family: var(--font-display);
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.footer-wordmark__en {
  display: block;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.footer-trust {
  max-width: 36rem;
  color: #C2CFC7;
  font-size: 0.92rem;
  line-height: 1.8;
}

.footer-heading {
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.footer-contact,
.footer-legal {
  display: grid;
  gap: 0.85rem;
}

.footer-contact__item {
  display: grid;
  gap: 0.15rem;
  color: #E6EFE9;
  font-size: 0.9rem;
  overflow-wrap: anywhere;
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.footer-legal__link {
  display: inline-block;
  padding: 0.15rem 0;
  color: var(--text-on-dark);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.footer-legal__link:hover,
.footer-legal__link:focus-visible,
.footer-legal__link[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.footer-bottom {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 1.25rem var(--page-gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  border-top: 1px solid var(--line);
}

.footer-copy,
.footer-icp {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.container {
  width: min(100% - 2rem, 1240px);
  margin-inline: auto;
}

.section {
  padding-block: clamp(3.5rem, 8vw, 6rem);
}

.section--dark {
  background: var(--bg-deep);
  color: var(--text-on-dark);
}

.section--light {
  background: var(--page-bg);
  color: var(--text-main);
}

.section--accent {
  background: var(--accent);
  color: var(--bg-deep);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1rem, 2.5vw, 2rem);
}

.span-8,
.span-6,
.span-4,
.span-3 {
  grid-column: span 12;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.eyebrow::before {
  content: "";
  width: 1.5rem;
  height: 2px;
  background: var(--accent);
}

.display-title {
  margin: 0.5rem 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 4.5rem);
  line-height: 0.95;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.display-title--light {
  color: var(--text-on-dark);
}

.note-vertical {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding-left: 0.5rem;
  border-left: 1px solid var(--line);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.8rem 1.25rem;
  border: 1px solid transparent;
  background: transparent;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 650;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg-deep);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--bg-deep);
  color: var(--accent);
  border-color: var(--bg-deep);
}

.btn--ghost {
  border-color: rgba(255, 255, 255, 0.35);
  color: var(--text-on-dark);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: rgba(212, 255, 0, 0.06);
  border-color: var(--accent);
  color: var(--accent);
}

.media {
  position: relative;
  overflow: hidden;
  min-height: 10rem;
  border: 1px solid var(--line);
  border-radius: clamp(0.75rem, 1.5vw, 1.25rem);
  background:
    linear-gradient(90deg, rgba(212, 255, 0, 0.04) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(rgba(212, 255, 0, 0.04) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(135deg, var(--bg-deep) 0%, var(--bg-deep-2) 55%, #1B3A30 100%);
}

.media::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 34%;
  height: 0.35rem;
  background: var(--accent);
}

.media__tag {
  position: absolute;
  left: 0.75rem;
  bottom: 0.75rem;
  z-index: 1;
  display: inline-block;
  padding: 0.35rem 0.55rem;
  background: rgba(11, 31, 26, 0.88);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-left: 2px solid var(--accent);
}

.media--ratio-16x9 {
  aspect-ratio: 16 / 9;
}

.media--ratio-4x3 {
  aspect-ratio: 4 / 3;
}

.media--ratio-1x1 {
  aspect-ratio: 1 / 1;
}

.chapter-preview {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 1rem;
  align-items: stretch;
}

.route-index {
  grid-column: span 12;
  display: grid;
  gap: 0.75rem;
}

.chapter-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--bg-mist);
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text-main);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.chapter-card__index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-dim);
}

.chapter-card__title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  text-transform: uppercase;
}

.chapter-card:hover,
.chapter-card:focus-visible {
  background: var(--bg-deep);
  border-color: var(--accent);
  color: var(--text-on-dark);
  transform: translateX(0.25rem);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}

.legend__item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.legend__chip {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 2px;
  background: var(--accent);
}

.legend__chip--yellow {
  background: var(--warning);
}

.legend__chip--red {
  background: var(--signal-red);
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(4rem, 8vw, 7rem) 0 clamp(3rem, 6vw, 5rem);
  background: var(--bg-deep);
  color: var(--text-on-dark);
}

.page-hero::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: clamp(1rem, 4vw, 6rem);
  background: linear-gradient(180deg, var(--accent), var(--warning), var(--signal-red));
  opacity: 0.4;
}

.page-hero__body {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--page-gutter);
  display: grid;
  gap: 1.5rem;
}

.page-hero__title {
  max-width: 12ch;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 5.5rem);
  line-height: 0.92;
  text-transform: uppercase;
}

.page-hero__intro {
  max-width: 42rem;
  color: #C2CFC7;
  font-size: 1.05rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 1rem 0;
  font-size: 0.8rem;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  color: var(--text-muted);
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--line);
}

.breadcrumb__link {
  color: var(--text-main);
  text-decoration: none;
}

.breadcrumb__link:hover,
.breadcrumb__link:focus-visible {
  color: var(--accent-dim);
}

.breadcrumb__link[aria-current="page"] {
  color: var(--text-main);
  text-decoration: underline;
  text-underline-offset: 0.25em;
}

@media (min-width: 700px) {
  .span-8 {
    grid-column: span 8;
  }

  .span-6 {
    grid-column: span 6;
  }

  .span-4 {
    grid-column: span 4;
  }

  .span-3 {
    grid-column: span 3;
  }

  .route-index {
    grid-column: span 6;
  }
}

@media (min-width: 861px) {
  .site-nav {
    display: flex;
    align-items: center;
  }

  .nav-toggle {
    display: none;
  }
}

@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: calc(100vh - 4rem);
    overflow: auto;
    background: linear-gradient(180deg, #0B1F1A, #071512);
    border-top: 1px solid rgba(212, 255, 0, 0.15);
    box-shadow: 0 18px 35px rgba(0, 0, 0, 0.35);
  }

  .site-nav[data-open] {
    display: block;
  }

  .nav-list {
    display: grid;
    gap: 0;
    padding: 1rem var(--page-gutter) 1.5rem;
  }

  .nav-link {
    display: block;
    padding: 0.85rem 0;
    font-size: 1rem;
    border-bottom: 1px solid var(--line);
  }

  .nav-link::after {
    display: none;
  }

  .footer-main {
    grid-template-columns: 1fr;
  }

  .footer-brand,
  .footer-column {
    grid-column: span 1;
  }

  .footer-contact__item {
    font-size: 0.85rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}