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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 7rem;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--clr-ink);
  background-color: var(--clr-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  margin: 0 0 0.5em;
  line-height: 1.3;
  color: var(--clr-primary);
}

p {
  margin: 0 0 1rem;
}

a {
  color: var(--clr-primary-light);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

button,
input,
select,
textarea {
  font: inherit;
}

ul,
ol {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
}

:root {
  --clr-primary: #1a3a5c;
  --clr-dark: #0f2540;
  --clr-primary-light: #2a5a8c;
  --clr-gold: #d4af37;
  --clr-gold-light: #f0d78c;
  --clr-bg: #f0f2f5;
  --clr-white: #ffffff;
  --clr-ink: #1a1a1a;
  --clr-gray: #4a4a4a;
  --clr-success: #3a7d44;
  --clr-warning: #d4764e;
  --clr-info: #5b8db8;
  --font-heading: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --shadow-sm: 0 1px 3px rgba(15, 37, 64, 0.08);
  --shadow-md: 0 6px 16px rgba(15, 37, 64, 0.12);
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --content-max: 1280px;
  --header-z: 100;
  --skip-z: 200;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  line-height: 1;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn--gold {
  background: var(--clr-gold);
  color: var(--clr-dark);
  border-color: var(--clr-gold);
}

.btn--gold:hover,
.btn--gold:focus-visible {
  background: var(--clr-gold-light);
  border-color: var(--clr-gold-light);
  color: var(--clr-dark);
}

.btn--outline {
  background: transparent;
  border-color: var(--clr-primary-light);
  color: var(--clr-primary);
}

.btn--outline:hover,
.btn--outline:focus-visible {
  border-color: var(--clr-primary);
  background: rgba(26, 58, 92, 0.06);
}

.btn--sm {
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
}

.btn--lg {
  padding: 1rem 2rem;
  font-size: 1.0625rem;
}

.skip-link {
  position: fixed;
  top: -3.5rem;
  left: 1rem;
  z-index: var(--skip-z);
  background: var(--clr-primary);
  color: #ffffff;
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.875rem;
  text-decoration: none;
  box-shadow: var(--shadow-md);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--header-z);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid #dfe3e8;
  box-shadow: 0 1px 3px rgba(15, 37, 64, 0.05);
}

.site-header__masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.875rem 0 0.75rem;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 0.125rem;
  color: var(--clr-primary);
  text-decoration: none;
  line-height: 1;
}

.brand__name {
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--clr-primary);
}

.brand__sub {
  font-size: 0.625rem;
  font-family: var(--font-mono);
  letter-spacing: 0.18em;
  color: var(--clr-gray);
  text-transform: uppercase;
}

.site-header__tools {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.site-header__cta {
  border-radius: 999px;
}

.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--clr-primary);
  background: var(--clr-white);
  border: 1px solid #d8dde3;
  border-radius: 999px;
  padding: 0.25rem 0.75rem;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
}

.version-badge__dot {
  position: relative;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--clr-success);
  flex: 0 0 auto;
}

.version-badge__dot::after {
  content: "";
  position: absolute;
  inset: -0.25rem;
  border-radius: 50%;
  border: 1px solid rgba(58, 125, 68, 0.5);
  animation: version-pulse 2.4s ease-out infinite;
}

@keyframes version-pulse {
  0% {
    transform: scale(0.7);
    opacity: 1;
  }
  75%,
  100% {
    transform: scale(1.5);
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .version-badge__dot::after {
    animation: none;
    display: none;
  }
}

.site-nav {
  border-top: 1px solid #e8ebef;
}

.site-nav__list {
  counter-reset: nav-index;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__item {
  counter-increment: nav-index;
  margin: 0;
}

.site-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.25rem;
  padding: 0.8125rem 1.125rem;
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--clr-primary);
  text-decoration: none;
  position: relative;
  transition: color 0.2s ease;
}

.site-nav__link::before {
  content: "0" counter(nav-index);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--clr-gold);
  vertical-align: super;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 1rem;
  right: 1rem;
  bottom: 0;
  height: 2px;
  background: var(--clr-gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s ease;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--clr-primary-light);
}

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

.site-nav__link[aria-current="page"] {
  color: var(--clr-primary);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.375rem 0.5rem;
  cursor: pointer;
  color: var(--clr-primary);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
}

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

.nav-toggle__label {
  order: 2;
}

.nav-toggle__icon {
  order: 1;
  position: relative;
  display: inline-block;
  width: 20px;
  height: 16px;
}

.nav-toggle__line {
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease, top 0.2s ease;
}

.nav-toggle__line:nth-child(1) {
  top: 0;
}

.nav-toggle__line:nth-child(2) {
  top: 7px;
}

.nav-toggle__line:nth-child(3) {
  top: 14px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
  top: 7px;
  transform: rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(3) {
  top: 7px;
  transform: rotate(-45deg);
}

@media (max-width: 899px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    border-top: 0;
    border-bottom: 1px solid #e8ebef;
  }

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

  .site-nav__list {
    flex-direction: column;
    justify-content: flex-start;
    padding: 0.5rem 0 0.75rem;
  }

  .site-nav__link {
    width: 100%;
    padding: 0.625rem 0.25rem;
    border-bottom: 1px solid #f0f2f5;
  }

  .site-nav__link::after {
    display: none;
  }
}

@media (max-width: 639px) {
  .version-badge {
    display: none;
  }
}

@media (max-width: 420px) {
  .brand__sub {
    display: none;
  }
}

.site-footer {
  position: relative;
  margin-top: 4rem;
  background-color: var(--clr-dark);
  background-image:
    linear-gradient(rgba(212, 175, 55, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 175, 55, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  color: #c3cede;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--clr-gold), var(--clr-gold-light), var(--clr-gold));
}

.site-footer .container {
  position: relative;
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: clamp(1.5rem, 5vw, 4rem);
  padding: 3.5rem 0 2.5rem;
}

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

.site-footer__trust {
  margin: 1.25rem 0 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: #a9b8c8;
  max-width: 34em;
}

.site-footer__support {
  margin: 1rem 0 0;
  font-size: 0.8125rem;
  color: #8fa0b3;
  line-height: 1.7;
}

.site-footer__support a {
  color: var(--clr-gold-light);
  text-decoration: none;
}

.site-footer__support a:hover,
.site-footer__support a:focus-visible {
  text-decoration: underline;
}

.site-footer__heading {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--clr-gold);
  margin: 0 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(212, 175, 55, 0.35);
}

.site-footer__contact,
.site-footer__nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__contact li,
.site-footer__nav li {
  margin-bottom: 0.625rem;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-size: 0.875rem;
  line-height: 1.6;
}

.site-footer__contact li::before {
  content: "";
  flex: 0 0 0.375rem;
  width: 0.375rem;
  height: 0.375rem;
  background: var(--clr-gold);
  transform: translateY(-0.15em);
}

.site-footer__nav li::before {
  content: "→";
  flex: 0 0 0.875rem;
  color: var(--clr-gold);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.site-footer__nav a,
.site-footer__contact a {
  color: #c3cede;
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-footer__nav a:hover,
.site-footer__nav a:focus-visible,
.site-footer__contact a:hover,
.site-footer__contact a:focus-visible {
  color: var(--clr-gold-light);
}

.brand--footer .brand__name {
  color: #ffffff;
  font-size: 1.75rem;
}

.brand--footer .brand__sub {
  color: var(--clr-gold);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 1.5rem 0 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.site-footer__copyright,
.site-footer__icp {
  margin: 0;
  font-size: 0.8125rem;
  color: #8fa0b3;
}

.site-footer__icp a {
  color: #8fa0b3;
  text-decoration: none;
}

.site-footer__icp a:hover,
.site-footer__icp a:focus-visible {
  color: var(--clr-gold-light);
}

@media (max-width: 899px) {
  .site-footer__top {
    grid-template-columns: 1fr 1fr;
    padding: 2.5rem 0 1.5rem;
  }

  .site-footer__col--brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 575px) {
  .site-footer__top {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0.875rem 0;
  font-size: 0.875rem;
}

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

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 0.375rem;
  color: var(--clr-gold);
  font-family: var(--font-mono);
}

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

.breadcrumb__link:hover,
.breadcrumb__link:focus-visible {
  text-decoration: underline;
}

.breadcrumb__item[aria-current="page"] {
  color: var(--clr-primary-light);
  font-weight: 700;
}

.page-header {
  padding: 3.5rem 0 2rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid #d8dde3;
  position: relative;
}

.page-header::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 3.5rem;
  height: 3px;
  background: var(--clr-gold);
}

.page-header__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--clr-primary);
  margin: 0 0 0.5rem;
}

.page-header__desc {
  margin: 0;
  max-width: 46em;
  color: var(--clr-gray);
  font-size: 1rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 1.625rem;
  font-weight: 900;
  color: var(--clr-primary);
  margin: 2.5rem 0 0.75rem;
  position: relative;
  padding-left: 0.875rem;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.2em;
  bottom: 0.2em;
  width: 0.25rem;
  background: var(--clr-gold);
}

.section-desc {
  color: var(--clr-gray);
  max-width: 46em;
  margin: 0 0 1.75rem;
}

.content-wrap {
  max-width: 46em;
  margin-inline: auto;
  padding: 2rem 1rem 4rem;
}

.content-wrap h2 {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--clr-primary);
  margin-top: 2em;
}

.content-wrap p {
  margin: 1rem 0;
  line-height: 1.8;
}

.content-wrap ul,
.content-wrap ol {
  padding-left: 1.5rem;
  margin: 1rem 0;
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.collage {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.5rem;
}

.collage > * {
  grid-column: 1 / -1;
}

@media (min-width: 700px) {
  .collage > .collage__span-4 {
    grid-column: span 4;
  }

  .collage > .collage__span-5 {
    grid-column: span 5;
  }

  .collage > .collage__span-6 {
    grid-column: span 6;
  }

  .collage > .collage__span-7 {
    grid-column: span 7;
  }

  .collage > .collage__span-8 {
    grid-column: span 8;
  }
}

.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: #e4e8ec;
  aspect-ratio: 16 / 9;
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

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

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

.media--gold-border {
  border: 2px solid var(--clr-gold);
  padding: 0.5rem;
  background: var(--clr-white);
}

.card {
  background: var(--clr-white);
  border: 1px solid #dfe3e8;
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--clr-primary-light);
}

.card__title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--clr-primary);
  margin: 0 0 0.5rem;
}

.card__text {
  color: var(--clr-gray);
  margin: 0;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0.5rem 0 1rem;
  padding: 0;
}

.tag {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-heading);
  color: var(--clr-info);
  background: rgba(91, 141, 184, 0.12);
  border: 1px solid rgba(91, 141, 184, 0.3);
  border-radius: 999px;
  padding: 0.25rem 0.625rem;
  text-decoration: none;
}

.tag--gold {
  color: #8a6d1f;
  background: rgba(212, 175, 55, 0.15);
  border-color: rgba(212, 175, 55, 0.4);
}

.tag--green {
  color: #2d6a3a;
  background: rgba(58, 125, 68, 0.12);
  border-color: rgba(58, 125, 68, 0.3);
}

.tag--orange {
  color: #b85f38;
  background: rgba(212, 118, 78, 0.12);
  border-color: rgba(212, 118, 78, 0.3);
}

.status-panel {
  border-left: 4px solid var(--clr-primary);
  background: var(--clr-white);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.status-panel__icon {
  flex: 0 0 auto;
  font-size: 1.25rem;
}

.status-panel--success {
  border-left-color: var(--clr-success);
}

.status-panel--warn {
  border-left-color: var(--clr-warning);
}

.status-panel--info {
  border-left-color: var(--clr-info);
}

.timeline {
  position: relative;
  list-style: none;
  margin: 2rem 0;
  padding: 0;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0.4375rem;
  top: 0.25rem;
  bottom: 0.25rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--clr-gold), var(--clr-primary-light));
}

.timeline__item {
  position: relative;
  padding-left: 2.25rem;
  margin-bottom: 1.75rem;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: 0.1875rem;
  top: 0.5rem;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--clr-gold);
  border: 2px solid var(--clr-white);
  box-shadow: 0 0 0 2px var(--clr-gold);
}

.timeline__version {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--clr-primary);
}

.timeline__date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--clr-gray);
}

.callout {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  margin: 1.5rem 0;
  font-size: 0.9375rem;
  background: rgba(91, 141, 184, 0.08);
  border-left: 4px solid var(--clr-info);
}

.callout--success {
  background: rgba(58, 125, 68, 0.08);
  border-left-color: var(--clr-success);
}

.callout--warn {
  background: rgba(212, 118, 78, 0.08);
  border-left-color: var(--clr-warning);
}

.table-wrap {
  overflow-x: auto;
  margin: 1.5rem 0;
}

.table-wrap table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  min-width: 36em;
}

.table-wrap th {
  background: var(--clr-primary);
  color: #ffffff;
  text-align: left;
  padding: 0.625rem 1rem;
  font-family: var(--font-heading);
  font-weight: 700;
  white-space: nowrap;
}

.table-wrap td {
  border-bottom: 1px solid #e1e5ea;
  padding: 0.625rem 1rem;
  vertical-align: top;
}

.table-wrap tr:nth-child(even) td {
  background: #f7f9fb;
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  pointer-events: none;
  z-index: calc(var(--header-z) + 1);
}

.scroll-progress::before {
  content: "";
  display: block;
  height: 100%;
  width: var(--scroll-progress, 0%);
  background: linear-gradient(90deg, var(--clr-primary-light), var(--clr-gold));
  transition: width 0.08s ease-out;
}

html.reveal-ready [data-reveal]:not([data-reveal="true"]) {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  transition-delay: var(--reveal-delay, 0s);
}

html.reveal-ready [data-reveal="true"] {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s ease, transform 0.6s ease;
  transition-delay: var(--reveal-delay, 0s);
}

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

[data-year] {
  font-variant-numeric: tabular-nums;
}

@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;
  }

  html.reveal-ready [data-reveal]:not([data-reveal="true"]),
  html.reveal-ready [data-reveal="true"] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .scroll-progress::before {
    transition: none;
  }

  .card:hover {
    transform: none;
  }
}