:root {
  --color-bg: #0B1B3B;
  --color-bg-card: #101F3F;
  --color-bg-hover: #1A2A4A;
  --color-bg-deep: #071327;
  --color-green: #39FF14;
  --color-green-bright: #6BFF4A;
  --color-green-dim: rgba(57, 255, 20, 0.65);
  --color-orange: #FF6A00;
  --color-text: #F0F4F8;
  --color-text-dim: #9BA7B8;
  --color-border: rgba(57, 255, 20, 0.3);
  --color-border-soft: rgba(240, 244, 248, 0.14);
  --font-head: Impact, 'Arial Black', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-body: 'Helvetica Neue', Arial, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-data: 'Courier New', Consolas, monospace;
  --container: 1200px;
  --radius: 0;
  --shadow-sm: 3px 3px 0 rgba(0, 0, 0, 0.3);
  --shadow: 6px 6px 0 rgba(0, 0, 0, 0.35);
  --shadow-lg: 10px 10px 0 rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

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

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

input,
button,
textarea,
select {
  font: inherit;
  letter-spacing: inherit;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(1100px 520px at 88% -6%, rgba(57, 255, 20, 0.08), transparent 60%),
    radial-gradient(820px 420px at -8% 32%, rgba(255, 106, 0, 0.06), transparent 55%),
    var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

p {
  margin-block: 1em;
}

a {
  color: var(--color-green);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--color-green-bright);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-head);
  line-height: 1.15;
  color: var(--color-text);
}

::selection {
  background: var(--color-green);
  color: #04122A;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-deep);
  border-left: 1px solid var(--color-border-soft);
}

::-webkit-scrollbar-thumb {
  background: var(--color-bg-hover);
  border: 2px solid var(--color-bg-deep);
}

::-webkit-scrollbar-thumb:hover {
  background: #26385E;
}

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

.container {
  width: min(var(--container), 92vw);
  margin-inline: auto;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

#main-content:focus {
  outline: none;
}

.section {
  padding-block: clamp(2.5rem, 7vw, 5.5rem);
}

.section--alt {
  background: var(--color-bg-card);
  border-block: 2px solid var(--color-border-soft);
}

.section--deep {
  background: var(--color-bg-deep);
  border-block: 2px solid var(--color-border-soft);
}

.grid {
  display: grid;
  gap: clamp(1rem, 3vw, 2rem);
}

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

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

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.7em 1.3em;
  border: 2px solid var(--color-green);
  background: var(--color-green);
  color: #04122A;
  font-family: var(--font-data);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.15s, box-shadow 0.15s;
}

.btn:hover {
  background: var(--color-green-bright);
  border-color: var(--color-green-bright);
  color: #04122A;
  transform: translate(-1px, -1px);
  box-shadow: var(--shadow);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.35);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--ghost:hover {
  background: rgba(57, 255, 20, 0.08);
  border-color: var(--color-green);
  color: var(--color-green);
}

.btn--orange {
  background: var(--color-orange);
  border-color: var(--color-orange);
  color: #140500;
}

.btn--orange:hover {
  background: #FF8533;
  border-color: #FF8533;
  color: #140500;
}

.badge {
  display: inline-block;
  padding: 0.22em 0.55em;
  border: 1px solid var(--color-border);
  background: rgba(57, 255, 20, 0.06);
  color: var(--color-green);
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.badge--orange {
  border-color: rgba(255, 106, 0, 0.4);
  background: rgba(255, 106, 0, 0.07);
  color: var(--color-orange);
}

.card {
  position: relative;
  background: var(--color-bg-card);
  border: 2px solid var(--color-border-soft);
  box-shadow: var(--shadow);
  padding: clamp(1.25rem, 3vw, 2rem);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  border-color: var(--color-border);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-lg);
}

.card__title {
  font-family: var(--font-head);
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.card__desc {
  color: var(--color-text-dim);
  font-size: 0.92rem;
}

.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 500;
  display: inline-block;
  padding: 0.6em 1.1em;
  background: var(--color-green);
  border: 2px solid var(--color-green);
  color: #04122A;
  font-weight: 700;
  font-size: 0.85rem;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transform: translateY(calc(-100% - 1rem));
  transition: transform 0.2s;
}

.skip-link:focus-visible {
  transform: translateY(0);
  outline: none;
}

.site-progress {
  position: relative;
  height: 3px;
  overflow: hidden;
  background: rgba(240, 244, 248, 0.08);
}

.site-progress__fill {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--color-green), var(--color-orange));
  box-shadow: 0 0 10px rgba(57, 255, 20, 0.6);
  transition: width 0.06s ease-out;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(11, 27, 59, 0.96);
  border-bottom: 1px solid var(--color-border);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.site-header__top {
  background: rgba(7, 19, 39, 0.72);
  border-bottom: 1px solid var(--color-border-soft);
}

.site-header__top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 56px;
}

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

.brand__mark {
  font-family: var(--font-head);
  font-size: 1.75rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--color-text);
}

.brand__chip {
  display: inline-block;
  margin-left: 0.25em;
  padding: 0.14em 0.36em 0.2em;
  background: var(--color-green);
  color: var(--color-bg-deep);
  font-family: var(--font-head);
  font-size: 0.58em;
  line-height: 1;
  vertical-align: baseline;
}

.brand__meta {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
  border-left: 1px solid var(--color-border-soft);
  padding-left: 0.7rem;
}

.brand__name {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand__desc {
  font-family: var(--font-data);
  font-size: 0.68rem;
  color: var(--color-text-dim);
}

.status-dot {
  display: inline-block;
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-green);
  box-shadow: 0 0 8px rgba(57, 255, 20, 0.8);
  animation: status-pulse 1.8s ease-in-out infinite;
}

@keyframes status-pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.4;
    transform: scale(0.72);
  }
}

.site-header__statement {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--color-text-dim);
  white-space: nowrap;
}

.site-header__main {
  position: relative;
}

.site-header__main-inner {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 1rem;
  min-height: 48px;
}

.site-nav {
  display: flex;
  align-items: stretch;
}

.site-nav__list {
  display: flex;
  align-items: stretch;
  gap: 0.2rem;
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: 0.4em;
  padding: 0 0.8rem;
  border-bottom: 2px solid transparent;
  color: var(--color-text-dim);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-text);
  background: rgba(26, 42, 74, 0.45);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-text);
  border-bottom-color: var(--color-green);
  background: linear-gradient(0deg, rgba(57, 255, 20, 0.12), transparent 70%);
}

.site-nav__index {
  font-family: var(--font-data);
  font-size: 0.63rem;
  color: var(--color-green);
  opacity: 0.65;
}

.site-nav__link:hover .site-nav__index,
.site-nav__link[aria-current="page"] .site-nav__index {
  opacity: 1;
}

.site-header__current {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  color: var(--color-text-dim);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.site-header__current::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-orange);
  box-shadow: 0 0 8px var(--color-orange);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55em;
  min-height: 36px;
  padding: 0.35em 0.8em;
  background: transparent;
  border: 1px solid var(--color-border-soft);
  color: var(--color-text);
  cursor: pointer;
}

.nav-toggle:hover {
  border-color: var(--color-border);
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
}

.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-green);
  transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle__text {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.breadcrumbs {
  margin: 1.25rem 0 0;
  font-family: var(--font-data);
  font-size: 0.76rem;
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35em 0;
  color: var(--color-text-dim);
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
}

.breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin: 0 0.55em;
  color: rgba(240, 244, 248, 0.22);
}

.breadcrumbs__link {
  color: var(--color-text-dim);
  text-decoration: none;
}

.breadcrumbs__link:hover {
  color: var(--color-green);
}

.breadcrumbs__item[aria-current="page"] {
  color: var(--color-green);
}

.page-lead {
  padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(1.5rem, 4vw, 2.5rem);
  border-bottom: 2px solid var(--color-border);
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-lead__kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-orange);
}

.page-lead__kicker::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--color-green);
}

.page-lead__title {
  font-family: var(--font-head);
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  line-height: 0.95;
  margin: 0.45em 0 0.3em;
  letter-spacing: 0.01em;
}

.page-lead__desc {
  max-width: 60ch;
  color: var(--color-text-dim);
  font-size: 1rem;
}

.page-lead__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  margin-top: 1.2rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--color-border-soft);
  font-family: var(--font-data);
  font-size: 0.74rem;
  color: var(--color-text-dim);
}

.chapter {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: end;
  gap: 0.4rem 1.25rem;
  margin-bottom: 1.75rem;
}

.chapter__index {
  grid-row: span 2;
  font-family: var(--font-head);
  font-size: clamp(3rem, 8vw, 5rem);
  line-height: 0.8;
  color: rgba(57, 255, 20, 0.14);
  -webkit-text-stroke: 1px rgba(57, 255, 20, 0.6);
}

.chapter__kicker {
  align-self: self-end;
  padding-bottom: 0.4rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-orange);
}

.chapter__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  line-height: 1.05;
}

.directory {
  border: 2px solid var(--color-border);
  background: var(--color-bg-card);
  box-shadow: var(--shadow);
}

.directory__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 2px solid var(--color-border);
}

.directory__title {
  margin: 0;
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-green);
}

.directory__total {
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-text-dim);
}

.directory__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.directory__item {
  border-bottom: 1px solid var(--color-border-soft);
}

.directory__item:last-child {
  border-bottom: 0;
}

.directory__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.25rem;
  color: var(--color-text);
  text-decoration: none;
  transition: background 0.15s;
}

.directory__link:hover {
  background: rgba(57, 255, 20, 0.05);
}

.directory__group {
  display: inline-flex;
  align-items: baseline;
  gap: 0.7em;
}

.directory__num {
  font-family: var(--font-data);
  font-size: 0.72rem;
  color: var(--color-green);
}

.directory__label {
  color: inherit;
  transition: color 0.15s;
}

.directory__link:hover .directory__label {
  color: var(--color-green);
}

.directory__arrow {
  font-family: var(--font-data);
  color: var(--color-text-dim);
  transition: transform 0.15s, color 0.15s;
}

.directory__link:hover .directory__arrow {
  transform: translateX(4px);
  color: var(--color-green);
}

.side-note {
  margin: 1.25em 0;
  padding: 0.5em 0 0.5em 0.75em;
  border-left: 3px solid var(--color-orange);
  font-family: var(--font-data);
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--color-text-dim);
}

.stat {
  padding: 1rem 1.25rem;
  border: 2px solid var(--color-border-soft);
  background: var(--color-bg-card);
  box-shadow: var(--shadow-sm);
}

.stat__num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  line-height: 1.1;
  color: var(--color-green);
}

.stat__label {
  display: block;
  margin-top: 0.3em;
  font-size: 0.78rem;
  color: var(--color-text-dim);
  letter-spacing: 0.04em;
}

.media {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--color-border-soft);
  background:
    linear-gradient(135deg, rgba(57, 255, 20, 0.08), transparent 45%),
    linear-gradient(45deg, var(--color-bg-deep), var(--color-bg-card));
  box-shadow: var(--shadow);
}

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

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

.media--wide {
  aspect-ratio: 21 / 9;
}

.media img,
.media picture,
.media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  margin: 0;
  max-width: 100%;
  padding: 0.4em 0.8em;
  background: rgba(7, 19, 39, 0.85);
  border-top: 1px solid var(--color-border);
  font-family: var(--font-data);
  font-size: 0.7rem;
  color: var(--color-text-dim);
}

.media__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: clamp(1rem, 3vw, 2rem);
}

.flow-line {
  height: 2px;
  margin: clamp(2rem, 5vw, 3.5rem) 0;
  border: 0;
  background: repeating-linear-gradient(90deg, rgba(57, 255, 20, 0.35) 0 10px, transparent 10px 22px);
}

.site-footer {
  position: relative;
  margin-top: auto;
  background:
    linear-gradient(180deg, rgba(11, 27, 59, 0.2), var(--color-bg-deep) 140px),
    var(--color-bg-deep);
  border-top: 2px solid var(--color-border);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 10%;
  width: 80%;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(57, 255, 20, 0.8), transparent);
  pointer-events: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1.2fr 1.6fr;
  gap: clamp(2rem, 5vw, 3.5rem);
  padding-block: clamp(2.5rem, 6vw, 4rem) clamp(1.5rem, 4vw, 2.5rem);
}

.footer-brand__mark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.15em;
  margin: 0;
  font-family: var(--font-head);
  font-size: 2rem;
  line-height: 1;
  color: var(--color-text);
}

.footer-brand__mark span {
  color: var(--color-green);
}

.footer-brand__desc {
  margin-top: 0.8rem;
  max-width: 46ch;
  color: var(--color-text-dim);
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-brand__trust {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.1rem;
  padding: 0.45em 0.8em;
  border: 1px solid var(--color-border);
  background: rgba(57, 255, 20, 0.05);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--color-green);
}

.footer-nav__title {
  margin: 0 0 1em;
  padding-bottom: 0.5em;
  border-bottom: 1px solid var(--color-border-soft);
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-dim);
}

.footer-nav__list {
  display: grid;
  gap: 0.6em;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-nav__list a {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  color: var(--color-text-dim);
  text-decoration: none;
  transition: color 0.15s, transform 0.15s;
}

.footer-nav__list a::before {
  content: "→";
  font-family: var(--font-data);
  color: var(--color-green);
  opacity: 0;
  transition: opacity 0.15s, transform 0.15s;
}

.footer-nav__list a:hover {
  color: var(--color-green);
  transform: translateX(2px);
}

.footer-nav__list a:hover::before {
  opacity: 1;
}

.footer-contact__list {
  display: grid;
  gap: 0.6em;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--color-text-dim);
  font-size: 0.9rem;
}

.footer-contact__label {
  color: var(--color-text);
  font-weight: 600;
}

.footer-contact__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3em;
  margin-top: 0.6rem;
}

.footer-contact__links a {
  padding: 0.3em 0.7em;
  border: 1px solid var(--color-border-soft);
  background: rgba(240, 244, 248, 0.04);
  color: var(--color-text-dim);
  font-family: var(--font-data);
  font-size: 0.76rem;
  text-decoration: none;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.footer-contact__links a:hover {
  color: var(--color-green);
  border-color: var(--color-border);
  background: rgba(57, 255, 20, 0.07);
}

.footer-bottom {
  border-top: 1px solid var(--color-border-soft);
}

.footer-bottom__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.4rem 2rem;
  padding-block: 1.2rem;
  font-family: var(--font-data);
  font-size: 0.72rem;
  color: var(--color-text-dim);
}

.footer-bottom__inner p {
  margin: 0;
}

.footer-bottom__icp {
  white-space: nowrap;
}

.to-top {
  position: fixed;
  right: 1.1rem;
  bottom: 1.1rem;
  z-index: 260;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 2px solid var(--color-border);
  background: rgba(16, 31, 63, 0.92);
  color: var(--color-green);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s, background 0.15s, color 0.15s;
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover {
  background: var(--color-green);
  color: var(--color-bg-deep);
}

[data-spy-link].is-active {
  color: var(--color-green);
}

@media (max-width: 1024px) {
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .site-header__statement {
    display: none;
  }

  .site-header__current {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-header__main-inner {
    align-items: center;
    min-height: 52px;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    background: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    border-bottom: 2px solid var(--color-border);
    box-shadow: 0 20px 32px rgba(0, 0, 0, 0.45);
    max-height: calc(100vh - 140px);
    overflow-y: auto;
  }

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

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .site-nav__item + .site-nav__item {
    border-top: 1px solid var(--color-border-soft);
  }

  .site-nav__link {
    justify-content: space-between;
    padding: 0.85rem 5%;
    border-left: 2px solid transparent;
    border-bottom: 0;
    white-space: normal;
  }

  .site-nav__link[aria-current="page"] {
    border-left-color: var(--color-green);
    border-bottom: 0;
    background: rgba(57, 255, 20, 0.09);
  }
}

@media (max-width: 767px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom__inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .brand__meta {
    display: none;
  }

  .brand__mark {
    font-size: 1.55rem;
  }

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

  .chapter__index {
    grid-row: auto;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .status-dot {
    animation: none;
  }
}