:root {
  --c-red: #E63329;
  --c-yellow: #FFD100;
  --c-dark: #232323;
  --c-warm: #FAF7F2;
  --c-white: #FFFFFF;
  --c-dark-red: #B0261D;
  --c-pale-yellow: #FFF6CC;
  --c-charcoal: #3D3D3D;
  --c-navy: #1F3A5F;
  --c-cream: #F2EBDF;
  --font-display: 'ZCOOL KuaiLe', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
  --shadow-hard: 6px 6px 0 var(--c-dark);
  --shadow-small: 3px 3px 0 var(--c-dark);
  --border-thick: 3px solid var(--c-dark);
}

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

html {
  scroll-behavior: smooth;
}

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

ul,
ol {
  padding: 0;
}

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

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--c-warm);
  color: var(--c-charcoal);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  color: var(--c-dark);
  line-height: 1.3;
}

a {
  color: var(--c-dark-red);
}

a:hover {
  color: var(--c-red);
}

#main-content {
  flex: 1 0 auto;
  outline: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin-right: auto;
  margin-left: auto;
  padding-right: 20px;
  padding-left: 20px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: 16px;
  z-index: 100;
  background: var(--c-dark);
  color: var(--c-yellow);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  padding: 10px 18px;
  border: 2px solid var(--c-yellow);
  box-shadow: 4px 4px 0 var(--c-red);
  transform: translateY(-160%);
  transition: transform 150ms ease;
}

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 300;
  pointer-events: none;
}

.scroll-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--c-red);
  transform-origin: 0 0;
  transform: scaleX(0);
  transition: transform 80ms linear;
}

.site-header {
  flex-shrink: 0;
  background: var(--c-white);
}

.header-mast {
  background: var(--c-white);
  border-bottom: 4px solid var(--c-dark);
}

.header-mast__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 16px;
  padding-bottom: 16px;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.site-brand__mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  background: var(--c-red);
  color: var(--c-white);
  font-family: var(--font-display);
  font-size: 28px;
  border: 3px solid var(--c-yellow);
  border-radius: 50%;
  box-shadow: var(--shadow-small);
  flex-shrink: 0;
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-brand__name {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-dark);
  line-height: 1.2;
}

.site-brand__name span {
  color: var(--c-red);
}

.site-brand__tagline {
  display: inline-block;
  align-self: flex-start;
  background: var(--c-yellow);
  color: var(--c-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border-right: 4px solid var(--c-red);
}

.site-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-dark);
  background: var(--c-yellow);
  border: 2px solid var(--c-dark);
  box-shadow: 3px 3px 0 var(--c-red);
  padding: 5px 10px;
  white-space: nowrap;
  transform: rotate(1.5deg);
  flex-shrink: 0;
}

.header-navbar {
  background: var(--c-dark);
  border-top: 3px solid var(--c-red);
}

.header-navbar__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 48px;
  gap: 12px;
}

.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: 2px;
}

.nav-link {
  display: block;
  padding: 12px 16px;
  color: var(--c-warm);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  border-bottom: 4px solid transparent;
  transition: background 150ms ease, color 150ms ease, border-color 150ms ease;
}

.nav-link:hover {
  background: var(--c-red);
  color: var(--c-white);
}

.nav-link[aria-current="page"] {
  background: var(--c-yellow);
  color: var(--c-dark);
  font-weight: 700;
  border-bottom-color: var(--c-red);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  background: var(--c-yellow);
  color: var(--c-dark);
  border: 2px solid var(--c-dark);
  box-shadow: 3px 3px 0 var(--c-red);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 8px 12px;
  cursor: pointer;
  transition: background 150ms ease, color 150ms ease;
}

.nav-toggle:hover {
  background: var(--c-red);
  color: var(--c-white);
}

.nav-toggle[aria-expanded="true"] {
  background: var(--c-red);
  color: var(--c-white);
}

.nav-toggle__icon {
  display: inline-grid;
  gap: 3px;
}

.nav-toggle__icon span {
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 150ms ease, opacity 150ms ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.site-footer {
  flex-shrink: 0;
  background: var(--c-dark);
  color: var(--c-warm);
  border-top: 6px solid var(--c-red);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.25fr 0.8fr 1fr 0.7fr;
  gap: 40px;
  padding-top: 48px;
  padding-bottom: 48px;
}

.footer-col {
  min-width: 0;
}

.footer-wordmark {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 700;
  color: var(--c-yellow);
  line-height: 1.2;
  margin-bottom: 16px;
}

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

.footer-about {
  font-size: 14px;
  line-height: 1.8;
  color: #c9c3bb;
  margin-bottom: 16px;
}

.footer-trust {
  font-size: 13px;
  line-height: 1.8;
  color: #9a948a;
  background: rgba(255, 255, 255, 0.04);
  border-left: 4px solid var(--c-yellow);
  padding: 10px 14px;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-yellow);
  border-bottom: 2px solid var(--c-red);
  padding-bottom: 8px;
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
}

.footer-links li + li {
  margin-top: 8px;
}

.footer-links a {
  color: var(--c-warm);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 150ms ease, border-color 150ms ease;
}

.footer-links a:hover {
  color: var(--c-yellow);
  border-bottom-color: var(--c-yellow);
}

.footer-contact {
  list-style: none;
}

.footer-contact li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 10px;
  padding: 7px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.14);
  font-size: 14px;
}

.footer-contact li:last-child {
  border-bottom: none;
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-yellow);
}

.footer-contact__value {
  color: #d8d2c8;
  word-break: break-word;
}

.footer-bottom {
  background: #181818;
  border-top: 2px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 8px 16px;
  padding-top: 16px;
  padding-bottom: 16px;
}

.footer-copy,
.footer-icp {
  font-family: var(--font-mono);
  font-size: 12px;
  color: #a09a92;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.05em;
  text-decoration: none;
  border: 2px solid var(--c-dark);
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease, color 120ms ease;
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: none;
}

.btn--primary {
  background: var(--c-red);
  color: var(--c-white);
  box-shadow: 4px 4px 0 var(--c-dark);
}

.btn--primary:hover {
  background: var(--c-dark-red);
  color: var(--c-white);
}

.btn--ghost {
  background: transparent;
  color: var(--c-dark);
  box-shadow: 4px 4px 0 var(--c-dark);
}

.btn--ghost:hover {
  background: var(--c-yellow);
  color: var(--c-dark);
}

.card {
  background: var(--c-white);
  border: var(--border-thick);
  box-shadow: var(--shadow-hard);
  padding: 24px;
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.card:hover {
  transform: translate(-2px, -4px);
  box-shadow: 8px 10px 0 var(--c-red);
}

.index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 4px 12px;
  border: 2px solid var(--c-dark);
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.tag--yellow {
  background: var(--c-yellow);
  color: var(--c-dark);
}

.tag--red {
  background: var(--c-red);
  color: var(--c-white);
}

.notice-board {
  background: var(--c-pale-yellow);
  border: 4px solid var(--c-dark);
  box-shadow: 6px 6px 0 var(--c-red);
  padding: 24px;
  margin-bottom: 32px;
  color: var(--c-dark);
}

.toc {
  background: var(--c-warm);
  border-left: 4px solid var(--c-red);
  border-top: 2px solid var(--c-cream);
  border-bottom: 2px solid var(--c-cream);
  padding: 16px 20px;
  margin-bottom: 32px;
}

.toc__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-dark);
  margin-bottom: 8px;
}

.toc__list {
  list-style: none;
}

.toc__link {
  display: block;
  padding: 7px 0 7px 10px;
  color: var(--c-charcoal);
  text-decoration: none;
  border-bottom: 1px dashed #d9d2c6;
  border-left: 3px solid transparent;
  font-size: 15px;
  transition: color 150ms ease, border-color 150ms ease, background 150ms ease;
}

.toc__link:hover {
  color: var(--c-red);
  border-left-color: var(--c-yellow);
}

.toc__link.is-active {
  background: var(--c-yellow);
  border-left-color: var(--c-red);
  color: var(--c-dark);
  font-weight: 700;
}

.tabs {
  margin-bottom: 32px;
}

.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  list-style: none;
  border-bottom: 3px solid var(--c-dark);
  padding: 0;
}

.tabs__btn {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 10px 18px;
  background: transparent;
  border: 2px solid transparent;
  border-bottom: none;
  color: var(--c-charcoal);
  cursor: pointer;
  margin-bottom: -3px;
  transition: background 150ms ease, color 150ms ease, border-color 150ms ease;
}

.tabs__btn:hover {
  background: var(--c-pale-yellow);
}

.tabs__btn[aria-selected="true"] {
  background: var(--c-dark);
  border-color: var(--c-dark);
  color: var(--c-yellow);
}

.tabs__panel {
  background: var(--c-white);
  border: 3px solid var(--c-dark);
  border-top: none;
  padding: 24px;
}

.tabs__panel[hidden] {
  display: none;
}

.timeline {
  list-style: none;
  border-left: 4px solid var(--c-yellow);
  margin: 0;
  padding: 0 0 0 24px;
}

.timeline__item {
  position: relative;
  padding-bottom: 24px;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 4px;
  width: 14px;
  height: 14px;
  background: var(--c-red);
  border: 2px solid var(--c-yellow);
  border-radius: 50%;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-charcoal);
  margin-bottom: 24px;
  padding: 8px 0;
  border-bottom: 2px solid var(--c-cream);
}

.breadcrumb a {
  color: var(--c-dark-red);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb__sep {
  margin: 0 8px;
  color: var(--c-red);
}

.page-title {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 700;
  color: var(--c-dark);
  line-height: 1.2;
  margin-bottom: 12px;
}

.page-title__no {
  display: inline-grid;
  place-items: center;
  min-width: 46px;
  height: 46px;
  padding: 0 8px;
  background: var(--c-red);
  border: 3px solid var(--c-dark);
  box-shadow: 3px 3px 0 var(--c-yellow);
  color: var(--c-white);
  font-family: var(--font-mono);
  font-size: 18px;
}

.section-block {
  padding-top: 56px;
  padding-bottom: 56px;
}

.section-block + .section-block {
  border-top: 2px solid var(--c-cream);
}

.prose {
  font-size: 16px;
  line-height: 1.9;
  color: var(--c-charcoal);
}

.prose p + p {
  margin-top: 1em;
}

.prose h2,
.prose h3 {
  margin-top: 1.6em;
  margin-bottom: 0.5em;
}

:target {
  scroll-margin-top: 24px;
}

.is-targeted {
  animation: target-flash 600ms ease-out;
}

@keyframes target-flash {
  0% {
    box-shadow: inset 0 0 0 2px var(--c-red);
  }
  40% {
    box-shadow: inset 0 0 0 2px var(--c-red);
  }
  100% {
    box-shadow: inset 0 0 0 0 transparent;
  }
}

a:focus-visible,
button:focus-visible {
  outline: 4px solid var(--c-dark);
  outline-offset: 2px;
}

@media (max-width: 1023px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .header-mast__inner {
    padding-top: 14px;
    padding-bottom: 14px;
  }

  .site-brand__name {
    font-size: 21px;
  }
}

@media (max-width: 767px) {
  .container {
    padding-right: 14px;
    padding-left: 14px;
  }

  .header-mast__inner {
    flex-wrap: wrap;
    gap: 10px 12px;
  }

  .site-badge {
    margin-left: auto;
  }

  .site-brand__text {
    min-width: 0;
  }

  .site-brand__name {
    font-size: 20px;
  }

  .header-navbar__inner {
    flex-wrap: wrap;
    align-items: center;
    padding-top: 8px;
    padding-bottom: 8px;
  }

  .site-nav {
    display: none;
    order: 2;
    flex: 0 0 100%;
    border-top: 2px solid var(--c-red);
    background: #1d1d1d;
    margin-top: 4px;
  }

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

  .nav-toggle {
    display: inline-flex;
    order: 1;
    margin-left: auto;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
  }

  .nav-link {
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    border-left: 4px solid transparent;
    padding: 14px 16px;
  }

  .nav-link:hover {
    background: var(--c-red);
  }

  .nav-link[aria-current="page"] {
    border-left-color: var(--c-red);
    border-bottom-color: var(--c-red);
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 40px;
    padding-bottom: 40px;
  }

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

  .section-block {
    padding-top: 40px;
    padding-bottom: 40px;
  }

  .tabs__list {
    flex-direction: column;
    gap: 0;
    border-bottom: none;
  }

  .tabs__btn {
    border: 2px solid var(--c-dark);
    margin-bottom: 4px;
    text-align: left;
  }

  .tabs__btn[aria-selected="true"] {
    border-color: var(--c-dark);
  }

  .tabs__panel {
    border-top: 3px solid var(--c-dark);
  }
}

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

  .site-brand__text {
    gap: 0;
  }

  .site-brand__name {
    font-size: 19px;
  }

  .site-badge {
    font-size: 11px;
  }
}

@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;
  }

  .is-targeted {
    animation: none;
  }
}