:root {
  --bg: #0B1026;
  --bg-2: #151B3B;
  --bg-3: #070B1A;
  --text: #E8ECF5;
  --text-dim: #8A93B5;
  --border: #2A3154;
  --accent: #FF5A36;
  --accent2: #00C6FF;
  --gold: #FFD166;
  --font-display: Impact, "Arial Black", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Courier New", monospace;
  --header-h: 68px;
  --page-max: 1440px;
  --gut: clamp(16px, 3vw, 48px);
  --border-w: 2px;
  --shadow: 8px 8px 0 rgba(0, 0, 0, 0.35);
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(circle at 85% 8%, rgba(0, 198, 255, 0.16), transparent 24rem),
    radial-gradient(circle at 12% 90%, rgba(255, 90, 54, 0.1), transparent 28rem),
    #0B1026;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text);
}

a {
  color: var(--accent2);
  text-underline-offset: 2px;
}

a:hover {
  color: var(--accent);
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

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

[hidden] {
  display: none !important;
}

::selection {
  background: var(--accent2);
  color: var(--bg);
}

:focus-visible {
  outline: 3px solid var(--accent2);
  outline-offset: 2px;
}

#main-content {
  flex: 1 0 auto;
  min-height: 70vh;
}

.container,
.page-frame {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding-left: var(--gut);
  padding-right: var(--gut);
}

.page-shell {
  padding: clamp(2.5rem, 6vw, 5rem) 0;
}

.section {
  padding: clamp(2rem, 5vw, 4.5rem) 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.2rem;
  border: var(--border-w) solid var(--text);
  background: transparent;
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: background 0.15s, color 0.15s, border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}

.btn:hover {
  background: var(--text);
  border-color: var(--text);
  color: var(--bg);
}

.btn:active {
  transform: translate(3px, 3px);
  box-shadow: none;
}

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

.btn--primary:hover {
  background: var(--accent2);
  border-color: var(--accent2);
  color: var(--bg);
}

.btn--ghost {
  border-color: var(--accent2);
  color: var(--accent2);
  box-shadow: 4px 4px 0 rgba(0, 198, 255, 0.28);
}

.btn--ghost:hover {
  background: var(--accent2);
  border-color: var(--accent2);
  color: var(--bg);
}

.btn--small {
  padding: 0.35rem 0.8rem;
  font-size: 0.85rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.breadcrumb a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.breadcrumb__sep {
  color: var(--border);
}

.section-index {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  border-bottom: var(--border-w) solid var(--border);
  padding-bottom: 0.75rem;
  margin-bottom: clamp(1.25rem, 3vw, 2.5rem);
}

.section-index__no {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
}

.section-index__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.6rem);
  line-height: 1.1;
}

.section-index__note {
  margin-left: auto;
  max-width: 34em;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.tile {
  position: relative;
  background: var(--bg-2);
  border: var(--border-w) solid var(--border);
  padding: 1.1rem 1.25rem;
  box-shadow: var(--shadow);
  transition: border-color 0.15s, transform 0.15s;
}

.tile:hover {
  border-color: var(--accent2);
  transform: translate(-2px, -2px);
}

.tile__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 0.35rem;
  letter-spacing: 0.02em;
}

.tile__meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.tile__text {
  color: var(--text-dim);
  font-size: 0.95rem;
}

.data-panel {
  background: var(--bg-2);
  border: var(--border-w) solid var(--border);
  box-shadow: var(--shadow);
}

.data-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border-bottom: var(--border-w) solid var(--border);
}

.data-panel__title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin: 0;
}

.data-panel__meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
}

.data-panel__body {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-dim);
  background: rgba(42, 49, 84, 0.4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.data-table tbody tr:hover {
  background: rgba(0, 198, 255, 0.07);
}

.data-table td {
  color: var(--text);
}

.data-table .num {
  font-family: var(--font-mono);
  color: var(--gold);
}

.tag {
  display: inline-block;
  padding: 0.12rem 0.55rem;
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--text-dim);
}

.tag--new {
  color: var(--gold);
  border-color: var(--gold);
  background: rgba(255, 209, 102, 0.08);
}

.tag--hot {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(255, 90, 54, 0.08);
}

.tag--data {
  color: var(--accent2);
  border-color: var(--accent2);
  background: rgba(0, 198, 255, 0.08);
}

.media-frame {
  --ratio: 4 / 3;
  position: relative;
  display: block;
  aspect-ratio: var(--ratio);
  overflow: hidden;
  background: linear-gradient(135deg, #151B3B 0%, #0B1026 70%, #2A3154 100%);
  border: var(--border-w) solid var(--border);
  box-shadow: var(--shadow);
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 75% 20%, rgba(0, 198, 255, 0.2), transparent 30%),
    linear-gradient(115deg, transparent 45%, rgba(255, 90, 54, 0.18) 100%);
}

.media-frame::after {
  content: "FIG · SKY-XK";
  position: absolute;
  right: 0;
  bottom: 0;
  padding: 0.2rem 0.6rem;
  background: var(--border);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
}

.media-frame[data-fig]::after {
  content: attr(data-fig);
}

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

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

.media-frame--square {
  --ratio: 1 / 1;
}

[data-toc] a {
  display: inline-block;
  border-left: 2px solid var(--border);
  padding: 0.2rem 0.6rem;
  color: var(--text-dim);
  text-decoration: none;
}

[data-toc] a:hover {
  color: var(--text);
  border-left-color: var(--accent);
}

[data-toc] a.is-active {
  color: var(--accent2);
  border-left-color: var(--accent2);
  background: rgba(0, 198, 255, 0.06);
}

.skip-link {
  position: absolute;
  top: 0.5rem;
  left: var(--gut);
  z-index: 2000;
  padding: 0.6rem 1rem;
  background: var(--accent);
  border: 2px solid var(--text);
  color: var(--bg);
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--shadow);
  transform: translateY(-300%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11, 16, 38, 0.94);
  border-bottom: 1px solid rgba(232, 236, 245, 0.35);
  box-shadow: 0 1px 0 var(--bg);
  backdrop-filter: blur(10px);
}

.site-header__inner {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  max-width: var(--page-max);
  margin: 0 auto;
  min-height: var(--header-h);
  padding: 0.5rem var(--gut);
}

.brand-block {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  text-decoration: none;
}

.brand-block:hover .brand-mark {
  background: var(--accent2);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--accent);
  border: 2px solid var(--text);
  color: var(--bg);
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.85rem;
  transform: rotate(-3deg);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: 0.08em;
  color: var(--text);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.24em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.main-nav {
  display: flex;
  flex: 1 1 auto;
  justify-content: center;
  min-width: 0;
}

.nav-list {
  display: flex;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  padding: 0.6rem 0.55rem;
  border: 2px solid transparent;
  color: var(--text-dim);
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}

.nav-link__index {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--accent);
}

.nav-link:hover {
  color: var(--text);
  background: var(--bg-2);
  border-color: var(--border);
}

.nav-link[aria-current="page"] {
  color: var(--accent2);
  background: rgba(0, 198, 255, 0.08);
  border-color: var(--accent2);
}

.nav-link[aria-current="page"] .nav-link__index {
  color: var(--gold);
}

.header-meta {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 0.6rem;
  margin-left: auto;
}

.cmd-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.7rem;
  background: var(--bg-2);
  border: 2px solid var(--border);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

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

.cmd-toggle[aria-expanded="true"] {
  background: rgba(0, 198, 255, 0.1);
  border-color: var(--accent2);
}

.cmd-toggle__icon {
  display: inline-block;
  width: 10px;
  height: 10px;
  border: 2px solid var(--accent2);
  transform: rotate(45deg);
}

.cmd-toggle[aria-expanded="true"] .cmd-toggle__icon {
  background: var(--accent);
  border-color: var(--accent);
}

.cmd-toggle__text {
  letter-spacing: 0.05em;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.55rem;
  background: rgba(21, 27, 59, 0.8);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(255, 90, 54, 0.22);
}

.status-text {
  font-family: var(--font-mono);
}

.cmd-hint {
  padding: 0.25rem 0.4rem;
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.6rem;
  border: 2px solid var(--border);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  cursor: pointer;
}

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

.nav-toggle__bar {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: var(--text);
}

.nav-toggle__bar::before,
.nav-toggle__bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--text);
  transition: transform 0.15s, top 0.15s;
}

.nav-toggle__bar::before {
  top: -5px;
}

.nav-toggle__bar::after {
  top: 5px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar::after {
  top: 0;
  transform: rotate(-45deg);
}

.nav-toggle__label {
  letter-spacing: 0.08em;
}

.cmd-menu {
  position: absolute;
  top: calc(100% - 1px);
  right: var(--gut);
  z-index: 1200;
  width: min(340px, calc(100vw - 2 * var(--gut)));
  padding: 1rem;
  background: var(--bg-2);
  border: 2px solid var(--border);
  box-shadow: var(--shadow);
}

.cmd-menu__label {
  margin: 0 0 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.cmd-menu__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.6rem;
  border: 2px solid transparent;
  color: var(--text);
  font-size: 0.92rem;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.cmd-menu__link span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
}

.cmd-menu__link:hover,
.cmd-menu__link:focus-visible {
  background: var(--bg);
  border-color: var(--accent);
  color: var(--text);
}

.cmd-menu__link:hover span {
  color: var(--accent2);
}

.site-header__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  z-index: 2;
  width: 100%;
  height: 3px;
  background: rgba(42, 49, 84, 0.5);
  pointer-events: none;
}

.site-header__progress [data-scroll-progress] {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent2) 100%);
  transform-origin: left center;
  transform: scaleX(0);
}

.site-footer {
  position: relative;
  flex-shrink: 0;
  margin-top: auto;
  background: var(--bg-3);
  border-top: 2px solid var(--border);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: min(320px, 60vw);
  height: 4px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent2) 70%, transparent);
}

.site-footer__inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 3.5rem) var(--gut) 1.5rem;
}

.site-footer__top {
  display: grid;
  grid-template-columns: 2fr 1fr 1.4fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-bottom: 2rem;
}

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

.footer-brand__title {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.8rem;
}

.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: var(--accent);
  border: 2px solid var(--text);
  color: var(--bg);
  font-family: var(--font-mono);
  font-weight: 800;
  transform: rotate(-3deg);
}

.footer-brand__name {
  display: block;
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.06em;
  color: var(--text);
}

.footer-brand__sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  color: var(--text-dim);
}

.footer-brand__desc {
  max-width: 42em;
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.7;
}

.footer-brand__icp {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
}

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

.footer-heading {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: var(--text);
}

.footer-heading span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.35rem 0.8rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links a {
  color: var(--text-dim);
  font-size: 0.88rem;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.footer-links a:hover {
  color: var(--accent2);
  border-bottom-color: var(--accent2);
}

.footer-contact {
  display: grid;
  gap: 0.55rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-contact__item {
  display: grid;
  grid-template-columns: 3.5em 1fr;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text);
}

.footer-contact__label {
  padding-top: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
}

.footer-contact__note {
  margin-top: 0.9rem;
  padding: 0.6rem 0.8rem;
  border-left: 3px solid var(--accent);
  background: rgba(42, 49, 84, 0.25);
  color: var(--text-dim);
  font-size: 0.8rem;
  line-height: 1.6;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

.footer-legal a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.footer-legal a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.footer-legal span[aria-hidden="true"] {
  color: var(--border);
}

@media (max-width: 1180px) {
  .cmd-hint {
    display: none;
  }

  .nav-link {
    padding: 0.55rem 0.4rem;
    font-size: 0.82rem;
  }

  .header-meta {
    gap: 0.4rem;
  }
}

@media (max-width: 980px) {
  .site-header__inner {
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    padding-top: 0.4rem;
    padding-bottom: 0.4rem;
  }

  .main-nav {
    order: 3;
    flex: 1 0 100%;
    display: none;
    margin-top: 0.2rem;
    border-top: 1px solid var(--border);
  }

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

  .nav-list {
    flex-direction: column;
    gap: 2px;
    padding: 0.5rem 0;
  }

  .nav-link {
    padding: 0.75rem 0.6rem;
    font-size: 0.95rem;
    white-space: normal;
  }

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

  .header-meta {
    margin-left: auto;
  }

  .site-footer__top {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  :root {
    --gut: 16px;
  }

  .site-header__inner {
    gap: 0.5rem;
  }

  .status-text {
    display: none;
  }

  .status-pill {
    padding: 0.28rem 0.4rem;
  }

  .cmd-toggle__text {
    display: none;
  }

  .cmd-toggle {
    padding: 0.4rem;
  }

  .site-footer__top {
    grid-template-columns: 1fr;
  }

  .footer-brand {
    grid-column: auto;
  }

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

  .footer-contact__item {
    grid-template-columns: 1fr;
    gap: 0.1rem;
  }

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

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

  *,
  *::before,
  *::after {
    transition: none !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}