:root {
  --color-primary: #0A1929;
  --color-primary-light: #1A365D;
  --color-accent: #F7B733;
  --color-accent-orange: #FF6B35;
  --color-white: #FFFFFF;
  --color-gray-50: #F9FAFB;
  --color-gray-200: #E5E7EB;
  --color-gray-500: #6B7280;
  --color-gray-800: #1F2937;
  --color-black: #111827;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Consolas, "Liberation Mono", monospace;
  --header-h: 72px;
  --container-w: 1280px;
  --gutter: 24px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;
  --border-light: rgba(255, 255, 255, 0.12);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-gray-800);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

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

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

::selection {
  background: var(--color-accent);
  color: var(--color-black);
}

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

.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;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: 12px;
  z-index: 2000;
  padding: 10px 18px;
  background: var(--color-accent);
  color: var(--color-black);
  font-size: 14px;
  font-weight: 700;
  transform: translateY(-400%);
  transition: transform 0.2s ease;
}

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

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

.scroll-progress span {
  display: block;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent) 60%, var(--color-accent-orange) 100%);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.1s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-accent {
  background: var(--color-accent);
  color: var(--color-black);
}

.btn-accent:hover {
  background: var(--color-accent-orange);
  color: var(--color-white);
}

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

.btn-ghost:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-arrow {
  font-size: 12px;
  transition: transform 0.2s ease;
}

.btn:hover .btn-arrow {
  transform: translate(2px, -2px);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  box-shadow: 0 2px 8px rgba(10, 25, 41, 0.25);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--border-light);
}

.header-shell {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  background: rgba(247, 183, 51, 0.12);
  border: 1px solid rgba(247, 183, 51, 0.4);
  padding: 4px 8px;
  line-height: 1;
}

.brand-text {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--color-white);
  line-height: 1.1;
  white-space: nowrap;
}

.brand-text em {
  display: block;
  font-style: normal;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.3em;
  color: var(--color-gray-500);
  margin-top: 2px;
}

.brand-footer .brand-text {
  font-size: 20px;
}

.header-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
  min-width: 0;
}

.nav-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.35);
  margin-right: 6px;
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  gap: 2px;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 14px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.68);
  border-left: 2px solid transparent;
  line-height: 1;
  white-space: nowrap;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.nav-link:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.06);
}

.nav-link[aria-current="page"] {
  color: var(--color-white);
  border-left-color: var(--color-accent);
  background: rgba(247, 183, 51, 0.08);
}

.nav-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent);
  opacity: 0.8;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  margin-left: 4px;
}

.version-badge {
  position: relative;
  display: flex;
}

.version-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
  background: rgba(247, 183, 51, 0.1);
  border: 1px solid rgba(247, 183, 51, 0.35);
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.version-tag:hover,
.version-badge[data-open] .version-tag {
  background: rgba(247, 183, 51, 0.22);
  border-color: var(--color-accent);
}

.version-dot {
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

.version-num {
  line-height: 1;
}

.version-pop {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 260px;
  padding: 16px 18px;
  background: var(--color-black);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-left: 3px solid var(--color-accent);
  color: var(--color-white);
  z-index: 60;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0s linear 0.18s;
}

.version-badge:hover .version-pop,
.version-badge:focus-within .version-pop,
.version-badge[data-open] .version-pop {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0s;
}

.version-pop::before {
  content: "";
  position: absolute;
  top: -6px;
  right: 22px;
  width: 10px;
  height: 10px;
  background: var(--color-black);
  border-left: 1px solid rgba(255, 255, 255, 0.14);
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  transform: rotate(45deg);
}

.version-pop-code {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.version-pop-title {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 6px;
}

.version-pop p {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.7);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  background: transparent;
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: border-color 0.2s ease;
}

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

.toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-white);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

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

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

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

.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.75);
  border-top: 4px solid var(--color-accent);
  margin-top: var(--space-8);
}

.footer-shell {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: var(--space-7) var(--gutter) var(--space-5);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--border-light);
}

.footer-brand .brand {
  margin-bottom: 16px;
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.footer-trust {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.55);
  max-width: 340px;
}

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

.footer-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer-title span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent);
}

.footer-list li {
  margin-bottom: 10px;
  font-size: 14px;
}

.footer-list a {
  color: rgba(255, 255, 255, 0.65);
  transition: color 0.2s ease, padding-left 0.2s ease;
  padding-left: 0;
}

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

.footer-contact li {
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.6);
  font-size: 13px;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent);
  margin-right: 8px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  padding-top: var(--space-4);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

.footer-copy,
.footer-icp {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
}

.footer-legal-links {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.footer-legal-links a {
  color: rgba(255, 255, 255, 0.5);
  transition: color 0.2s ease;
}

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

.page-shell {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: var(--space-6) var(--gutter) var(--space-8);
}

.page-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-5);
  align-items: end;
  margin-bottom: var(--space-7);
  padding-bottom: var(--space-5);
  border-bottom: 2px solid var(--color-primary);
  position: relative;
}

.page-head::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 80px;
  height: 2px;
  background: var(--color-accent);
}

.page-head-index {
  font-family: var(--font-mono);
  font-size: 52px;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--color-gray-200);
}

.page-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 15px;
  color: var(--color-gray-500);
  max-width: 640px;
  line-height: 1.7;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--color-gray-500);
  padding: 16px 0;
}

.breadcrumb a {
  color: var(--color-primary-light);
  transition: color 0.2s ease;
}

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

.breadcrumb .sep {
  color: var(--color-gray-200);
}

.breadcrumb [aria-current="page"] {
  color: var(--color-gray-800);
  font-weight: 600;
}

.content-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.content-container p {
  margin-bottom: 1.5em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--color-gray-800);
}

.content-container h2 {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-primary);
  margin: 2em 0 0.8em;
  border-left: 4px solid var(--color-accent);
  padding-left: 16px;
  line-height: 1.3;
}

.content-container h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin: 1.6em 0 0.6em;
}

.content-container a {
  color: var(--color-accent-orange);
  border-bottom: 1px solid currentColor;
  text-underline-offset: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.content-container a:hover {
  color: var(--color-primary);
  border-bottom-color: transparent;
}

.content-container ul,
.content-container ol {
  margin: 1em 0 1.5em;
  padding-left: 1.2em;
}

.content-container ul li {
  list-style: square;
  margin-bottom: 0.5em;
}

.content-container ol li {
  list-style: decimal;
  margin-bottom: 0.5em;
}

.content-container blockquote {
  border-left: 3px solid var(--color-accent);
  background: var(--color-gray-50);
  padding: 16px 24px;
  margin: 1.5em 0;
  color: var(--color-gray-500);
}

.content-container code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  padding: 2px 6px;
}

.content-container pre {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 24px;
  overflow-x: auto;
  margin: 1.5em 0;
}

.content-container pre code {
  background: transparent;
  border: 0;
  padding: 0;
}

.grid-bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
}

.bento-card {
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  padding: var(--space-5);
  position: relative;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.bento-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 8px 24px rgba(10, 25, 41, 0.08);
  transform: translateY(-2px);
}

.bento-card[data-span="3"] {
  grid-column: span 3;
}

.bento-card[data-span="4"] {
  grid-column: span 4;
}

.bento-card[data-span="6"] {
  grid-column: span 6;
}

.bento-card[data-span="8"] {
  grid-column: span 8;
}

.bento-card[data-span="12"] {
  grid-column: span 12;
}

.panel {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-top: 3px solid var(--color-primary);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-gray-200);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--color-gray-500);
}

.panel-body {
  padding: 20px;
}

.image-frame {
  position: relative;
  background: var(--color-gray-200);
  overflow: hidden;
  width: 100%;
}

.image-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.image-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-frame[data-ratio="4:3"]::before {
  padding-top: 75%;
}

.image-frame[data-ratio="1:1"]::before {
  padding-top: 100%;
}

.image-frame[data-ratio="3:4"]::before {
  padding-top: 133.33%;
}

.band {
  padding: var(--space-7) 0;
}

.band-dark {
  background: var(--color-primary);
  color: var(--color-white);
}

.band-dark h2 {
  color: var(--color-white);
}

.band-accent {
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-orange) 100%);
  color: var(--color-black);
}

@media (max-width: 1100px) {
  .header-shell {
    gap: 12px;
  }

  .nav-link {
    padding: 12px 9px;
  }

  .nav-idx {
    display: none;
  }
}

@media (min-width: 961px) {
  .nav-toggle {
    display: none;
  }
}

@media (max-width: 960px) {
  .header-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-primary);
    border-top: 1px solid var(--border-light);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.3);
    margin-left: 0;
    padding: 16px 24px 24px;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

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

  .nav-label {
    display: flex;
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 8px;
    margin-bottom: 8px;
  }

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

  .nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 8px;
    font-size: 15px;
    border-left: 3px solid transparent;
  }

  .nav-idx {
    display: inline-block;
    font-size: 11px;
    width: 24px;
  }

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

@media (max-width: 768px) {
  :root {
    --gutter: 16px;
  }

  .page-shell {
    padding: var(--space-5) var(--gutter) var(--space-7);
  }

  .page-head {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .page-head-index {
    font-size: 36px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
  }

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

  .footer-legal-links {
    margin-left: 0;
  }

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

  .bento-card[data-span],
  .bento-card {
    grid-column: span 1;
  }
}

@media (max-width: 480px) {
  .header-shell {
    gap: 8px;
    padding: 0 12px;
  }

  .brand-text {
    font-size: 19px;
  }

  .brand-text em {
    display: none;
  }

  .brand-idx {
    font-size: 10px;
    padding: 3px 6px;
  }

  .version-tag {
    padding: 7px 10px;
  }

  .btn-accent {
    padding: 10px 14px;
  }

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

  .version-pop {
    width: min(260px, calc(100vw - 32px));
  }
}

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .skip-link,
  .btn,
  .btn-accent,
  .btn-arrow,
  .nav-link,
  .nav-link[aria-current="page"],
  .version-tag,
  .version-pop,
  .toggle-line,
  .footer-list a,
  .footer-legal-links a,
  .bento-card,
  .breadcrumb a,
  .content-container a {
    transition: none;
  }
}