:root {
  --c-bg: #0A1B3D;
  --c-tech: #123B67;
  --c-accent: #FF7A00;
  --c-accent-soft: #FF9E3D;
  --c-gold: #F5C542;
  --c-text: #E8EDF5;
  --c-ink: #060E20;
  --c-success: #2ECC71;
  --c-danger: #E74C3C;
  --c-white: #FFFFFF;
  --font-title: 'PingFang SC', 'Noto Sans CJK SC', 'Microsoft YaHei', sans-serif;
  --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Courier New', monospace;
  --font-num: 'DIN Alternate', 'Roboto Mono', 'SFMono-Regular', Consolas, monospace;
  --header-h: 72px;
  --container-max: 1240px;
  --radius: 14px;
  --radius-sm: 8px;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 0.28s var(--ease);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background: var(--c-bg);
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-text);
  background:
    radial-gradient(1100px 540px at 86% -8%, rgba(255, 122, 0, 0.14), transparent 60%),
    radial-gradient(820px 520px at -12% 22%, rgba(18, 59, 103, 0.55), transparent 62%),
    var(--c-bg);
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(232, 237, 245, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 237, 245, 0.055) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}

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

a {
  color: inherit;
  text-decoration: none;
}

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

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-title);
  color: var(--c-white);
}

p { margin: 0; }

::selection {
  background: rgba(255, 122, 0, 0.35);
  color: var(--c-white);
}

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

[hidden] { display: none !important; }

.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;
}

#main-content,
.main-content {
  display: block;
  flex: 1 0 auto;
  scroll-margin-top: calc(var(--header-h) + 12px);
}

.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  position: relative;
  padding-block: 64px;
}

.page-head {
  padding: calc(var(--header-h) + 44px) 0 36px;
}

.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 2000;
  padding: 12px 20px;
  background: var(--c-accent);
  color: var(--c-ink);
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  transition: top 0.25s ease;
}

.skip-link:focus { top: 16px; }

.skip-link:focus-visible {
  outline: 3px solid var(--c-white);
  outline-offset: 2px;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  border-bottom: 1px solid rgba(232, 237, 245, 0.06);
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.site-header[data-scrolled] {
  background: rgba(6, 14, 32, 0.86);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom-color: rgba(232, 237, 245, 0.09);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.header-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: calc(var(--progress, 0) * 1%);
  background: linear-gradient(90deg, var(--c-accent), var(--c-gold));
  transition: width 80ms linear;
  pointer-events: none;
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: var(--header-h);
}

.brand {
  display: flex;
  align-items: center;
  flex: none;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--c-accent), var(--c-accent-soft));
  color: var(--c-ink);
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  border-radius: 12px;
  box-shadow: 0 4px 14px rgba(255, 122, 0, 0.28);
  flex: none;
}

.brand-text {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.08em;
  color: var(--c-white);
  white-space: nowrap;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-item {
  flex: none;
}

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-family: var(--font-title);
  font-weight: 500;
  font-size: 0.92rem;
  color: rgba(232, 237, 245, 0.8);
  white-space: nowrap;
  transition: background-color var(--transition), border-color var(--transition), color var(--transition);
}

.nav-index {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--c-accent-soft);
  opacity: 0.65;
  transition: opacity 0.2s ease;
}

.nav-link:hover {
  color: var(--c-white);
  background: rgba(255, 122, 0, 0.12);
  border-color: rgba(255, 122, 0, 0.32);
}

.nav-link:hover .nav-index {
  opacity: 1;
}

.nav-link[aria-current="page"] {
  color: var(--c-white);
  background: rgba(255, 122, 0, 0.16);
  border-color: rgba(255, 122, 0, 0.5);
}

.nav-link[aria-current="page"] .nav-index {
  color: var(--c-accent);
  opacity: 1;
}

.nav-toggle {
  display: none;
  flex: none;
  width: 46px;
  height: 46px;
  padding: 0;
  background: rgba(18, 59, 103, 0.4);
  border: 1px solid rgba(232, 237, 245, 0.16);
  border-radius: 12px;
  cursor: pointer;
  transition: border-color var(--transition), background-color var(--transition);
}

.nav-toggle:hover {
  border-color: rgba(255, 122, 0, 0.5);
}

.nav-toggle-line {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  border-radius: 2px;
  background: var(--c-text);
  transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(4) {
  transform: translateY(-6px) rotate(-45deg);
}

.header-coords {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 12px;
  border: 1px solid rgba(232, 237, 245, 0.12);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: rgba(232, 237, 245, 0.4);
  flex: none;
}

.header-coords span + span::before {
  content: "·";
  margin-right: 12px;
  color: var(--c-accent);
}

.site-footer {
  margin-top: auto;
  background:
    radial-gradient(720px 280px at 90% 10%, rgba(255, 122, 0, 0.06), transparent 65%),
    var(--c-ink);
  border-top: 1px solid rgba(255, 122, 0, 0.22);
  color: rgba(232, 237, 245, 0.72);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr 1fr 1.2fr;
  gap: 36px;
  padding-block: 56px 44px;
}

.footer-brand-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--c-accent), var(--c-accent-soft));
  color: var(--c-ink);
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.02em;
  border-radius: 10px;
  flex: none;
}

.footer-brand-name {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  color: var(--c-white);
}

.footer-trust {
  margin-bottom: 10px;
  font-size: 0.94rem;
  color: rgba(232, 237, 245, 0.65);
  max-width: 32ch;
}

.footer-domain {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: rgba(245, 197, 66, 0.65);
}

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

.footer-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.14em;
  color: var(--c-white);
}

.footer-heading::before {
  content: "";
  width: 4px;
  height: 14px;
  background: var(--c-accent);
  border-radius: 2px;
  flex: none;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.92rem;
}

.footer-links a {
  color: rgba(232, 237, 245, 0.72);
  transition: color var(--transition), padding-left var(--transition);
}

.footer-links a:hover {
  color: var(--c-accent-soft);
  padding-left: 4px;
}

.footer-link-muted {
  color: rgba(232, 237, 245, 0.38);
  cursor: default;
}

.footer-pending {
  margin-left: 6px;
  padding: 1px 6px;
  border: 1px solid rgba(255, 122, 0, 0.35);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-style: normal;
  letter-spacing: 0.08em;
  color: var(--c-accent-soft);
}

.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.92rem;
}

.footer-contact-list li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 10px;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: rgba(245, 197, 66, 0.7);
  padding-top: 2px;
}

.contact-value {
  color: rgba(232, 237, 245, 0.78);
  overflow-wrap: anywhere;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding-block: 18px;
  border-top: 1px solid rgba(232, 237, 245, 0.08);
}

.footer-copy,
.footer-icp {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: rgba(232, 237, 245, 0.45);
}

.footer-icp {
  color: rgba(245, 197, 66, 0.65);
}

.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1px;
  width: 52px;
  height: 52px;
  padding: 0;
  background: rgba(18, 59, 103, 0.85);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 122, 0, 0.45);
  border-radius: 14px;
  color: var(--c-accent);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s, background-color 0.3s, color 0.3s;
}

.back-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  background: var(--c-accent);
  color: var(--c-ink);
  border-color: var(--c-accent);
}

.back-top-symbol {
  font-size: 1.1rem;
  line-height: 1;
}

.back-top-coord {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.06em;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 26px;
  border-radius: 999px;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
}

.btn-primary {
  background: var(--c-accent);
  color: var(--c-ink);
}

.btn-primary:hover {
  background: var(--c-accent-soft);
  box-shadow: 0 8px 24px rgba(255, 122, 0, 0.28);
}

.btn-ghost {
  background: rgba(18, 59, 103, 0.35);
  color: var(--c-text);
  border-color: rgba(232, 237, 245, 0.22);
}

.btn-ghost:hover {
  color: var(--c-white);
  border-color: var(--c-accent);
  background: rgba(255, 122, 0, 0.1);
}

.glass-card {
  position: relative;
  background: rgba(18, 59, 103, 0.42);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(232, 237, 245, 0.1);
  border-radius: var(--radius);
  padding: 28px;
  transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.glass-card:hover {
  background: rgba(18, 59, 103, 0.58);
  border-color: rgba(255, 122, 0, 0.42);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

.solid-card {
  position: relative;
  background: var(--c-bg);
  border: 1px solid rgba(255, 122, 0, 0.24);
  border-radius: var(--radius);
  padding: 28px;
}

[data-coord]::after {
  content: attr(data-coord);
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 2px 9px;
  border: 1px solid rgba(255, 122, 0, 0.3);
  border-radius: 5px;
  background: rgba(6, 14, 32, 0.55);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--c-accent-soft);
  pointer-events: none;
}

.section-label {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-accent-soft);
}

.section-label::before {
  content: "";
  width: 36px;
  height: 2px;
  background: var(--c-accent);
  flex: none;
}

.section-title {
  margin: 0 0 16px;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(2.2rem, 5vw, 4.5rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.section-lead {
  max-width: 64ch;
  margin-bottom: 28px;
  font-size: 1.02rem;
  color: rgba(232, 237, 245, 0.72);
}

.section-index {
  position: absolute;
  top: -0.2em;
  right: 0;
  z-index: 0;
  font-family: var(--font-mono);
  font-weight: 200;
  font-size: clamp(4.5rem, 10vw, 8.5rem);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 122, 0, 0.25);
  pointer-events: none;
  user-select: none;
}

.side-index {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px;
  background: rgba(6, 14, 32, 0.6);
  border: 1px solid rgba(232, 237, 245, 0.08);
  border-radius: var(--radius);
}

.side-index-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: rgba(232, 237, 245, 0.5);
  transition: color var(--transition), border-color var(--transition), background-color var(--transition);
}

.side-index-item:hover,
.side-index-item[data-active] {
  color: var(--c-white);
  border-left-color: var(--c-accent);
  background: rgba(255, 122, 0, 0.1);
}

.side-index-item[data-active] .side-index-no {
  color: var(--c-accent);
}

.side-index-no {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: rgba(245, 197, 66, 0.6);
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: rgba(232, 237, 245, 0.45);
}

.breadcrumb a {
  color: rgba(232, 237, 245, 0.55);
  transition: color var(--transition);
}

.breadcrumb a:hover {
  color: var(--c-accent-soft);
}

.breadcrumb-sep {
  color: rgba(245, 197, 66, 0.45);
}

.breadcrumb [aria-current="page"] {
  color: var(--c-text);
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  color: var(--c-text);
}

.data-table th {
  text-align: left;
  padding: 12px 16px;
  background: rgba(18, 59, 103, 0.65);
  border-bottom: 2px solid var(--c-accent);
  font-family: var(--font-title);
  font-weight: 700;
  color: var(--c-white);
  white-space: nowrap;
}

.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(232, 237, 245, 0.08);
}

.data-table tbody tr {
  transition: background-color 0.2s ease;
}

.data-table tbody tr:hover {
  background: rgba(255, 122, 0, 0.06);
}

.img-frame {
  position: relative;
  overflow: hidden;
  background: var(--c-tech);
  border: 1px solid rgba(232, 237, 245, 0.1);
  border-radius: var(--radius);
}

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

.img-frame--cover {
  position: relative;
  overflow: hidden;
  height: 100%;
  min-height: 180px;
}

.img-frame--cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-placeholder {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  background:
    repeating-linear-gradient(135deg, rgba(255, 122, 0, 0.07) 0, rgba(255, 122, 0, 0.07) 1px, transparent 1px, transparent 14px),
    linear-gradient(150deg, rgba(18, 59, 103, 0.7), rgba(6, 14, 32, 0.9));
  border: 1px dashed rgba(255, 122, 0, 0.3);
  border-radius: var(--radius);
}

.image-placeholder::before {
  content: attr(data-label);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: rgba(232, 237, 245, 0.35);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

[data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .header-coords { display: none; }

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 12px;
    right: 12px;
    z-index: 990;
    max-height: calc(100vh - var(--header-h) - 24px);
    overflow-y: auto;
    padding: 12px;
    background: rgba(6, 14, 32, 0.96);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 122, 0, 0.28);
    border-radius: 16px;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.45);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    display: flex;
    align-items: center;
    padding: 14px 16px;
    font-size: 1rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px 24px;
  }

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

@media (max-width: 600px) {
  :root { --header-h: 64px; }

  .container { padding-inline: 16px; }

  .brand-logo {
    width: 38px;
    height: 38px;
    font-size: 0.95rem;
    border-radius: 10px;
  }

  .brand-text { font-size: 1rem; }

  .section { padding-block: 40px; }

  .page-head {
    padding: calc(var(--header-h) + 32px) 0 28px;
  }

  .glass-card,
  .solid-card { padding: 20px; }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-block: 40px 32px;
  }

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

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

  .back-top {
    right: 16px;
    bottom: 16px;
    width: 48px;
    height: 48px;
    border-radius: 12px;
  }
}

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

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

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .site-nav,
  .header-progress,
  .back-top {
    transition-duration: 0.01ms !important;
  }
}