:root {
  --deep-space-blue: #0B1B2E;
  --space-blue-alt: #13283D;
  --electric-orange: #FF6C0A;
  --neon-green: #B8FF1A;
  --cobalt-blue: #2D6FF2;
  --ice-blue: #A0C8E0;
  --cloud-white: #F0F4F8;
  --slate-gray: #5C7A92;
  --card-blue: #1B4965;
  --alert-red: #FF3B3B;
  --font-display: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-data: "JetBrains Mono", "SF Mono", "Cascadia Code", Consolas, monospace;
  --font-quote: "Noto Serif SC", "Songti SC", "STSong", serif;
  --header-height: 4rem;
  --content-max: 1440px;
  --radius: 12px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--cloud-white);
  background-color: var(--deep-space-blue);
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 5rem);
}

h2 {
  font-size: clamp(1.8rem, 4vw, 3rem);
}

h3 {
  font-size: 1.35rem;
}

h4 {
  font-size: 1.1rem;
}

p, ul, ol, dl, figure {
  margin: 0 0 1rem;
}

a {
  color: var(--cobalt-blue);
  text-decoration: none;
}

a:hover {
  color: var(--electric-orange);
  text-decoration: underline;
}

ul, ol {
  list-style-position: inside;
}

:focus-visible {
  outline: 2px solid var(--electric-orange);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection {
  background: var(--electric-orange);
  color: var(--deep-space-blue);
}

.mono,
.data-text {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
}

.quote-text {
  font-family: var(--font-quote);
  font-style: italic;
  letter-spacing: 0.02em;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 1rem;
  transform: translateY(-300%);
  background: var(--electric-orange);
  color: var(--deep-space-blue);
  padding: 0.6rem 1rem;
  font-weight: 700;
  border-radius: 0 0 0.25rem 0.25rem;
  z-index: 2000;
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--deep-space-blue);
}

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

.section {
  padding: 4rem 0;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

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

.grid-cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(240px, 0.8fr) minmax(0, 1.6fr);
  gap: 2.5rem;
  align-items: start;
}

.split-aside {
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
}

.split-content {
  min-width: 0;
}

.chamfer {
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.toc {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid rgba(160, 200, 224, 0.2);
}

.toc-link {
  display: block;
  padding: 0.45rem 1rem;
  margin-left: -1px;
  border-left: 3px solid transparent;
  color: var(--ice-blue);
  font-size: 0.9rem;
  text-decoration: none;
}

.toc-link:hover {
  color: var(--neon-green);
  text-decoration: none;
  border-left-color: var(--neon-green);
}

.toc-link[aria-current="true"] {
  color: var(--cloud-white);
  border-left-color: var(--electric-orange);
  background: linear-gradient(90deg, rgba(255, 108, 10, 0.1), transparent);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.3rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: 0.25rem;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-primary {
  background: var(--electric-orange);
  color: var(--deep-space-blue);
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--ice-blue);
  color: var(--ice-blue);
}

.btn-secondary:hover {
  border-color: var(--neon-green);
  color: var(--neon-green);
}

.card {
  background: var(--space-blue-alt);
  border: 1px solid rgba(160, 200, 224, 0.12);
  border-radius: 0.25rem;
  padding: 1.5rem;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--electric-orange);
}

.card-media {
  position: relative;
  margin: -1.5rem -1.5rem 1.25rem;
  overflow: hidden;
}

.card-body {
  min-width: 0;
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.card-meta {
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--slate-gray);
  letter-spacing: 0.05em;
}

.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, var(--deep-space-blue), var(--card-blue));
  border: 1px solid rgba(160, 200, 224, 0.15);
  border-radius: 0.25rem;
}

.media-frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--electric-orange), var(--neon-green));
  opacity: 0.8;
}

.media-placeholder {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  color: var(--slate-gray);
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--neon-green);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 1.25rem;
  height: 2px;
  background: var(--electric-orange);
}

.tag-line {
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--neon-green);
}

.caption {
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--slate-gray);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
  font-size: 0.85rem;
  color: var(--slate-gray);
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--slate-gray);
}

.breadcrumb-link {
  color: var(--ice-blue);
  text-decoration: none;
}

.breadcrumb-link[aria-current="page"] {
  color: var(--cloud-white);
  font-weight: 700;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1020;
  background: rgba(11, 27, 46, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(160, 200, 224, 0.18);
}

.header-inner {
  max-width: var(--content-max);
  margin-inline: auto;
  height: var(--header-height);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.header-brand {
  flex: none;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--cloud-white);
  font-family: var(--font-display);
  font-weight: 900;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand:hover {
  color: var(--cloud-white);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  background: var(--electric-orange);
  color: var(--deep-space-blue);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  font-size: 1.2rem;
}

.brand-text {
  display: flex;
  align-items: baseline;
  line-height: 1.1;
  font-size: 1.1rem;
}

.brand-text small {
  margin-left: 0.35rem;
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: var(--neon-green);
  font-weight: 400;
}

.header-nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: block;
  padding: 0.5rem 0.8rem;
  color: var(--ice-blue);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--neon-green);
  text-decoration: none;
  border-bottom-color: var(--neon-green);
}

.nav-link[aria-current="page"] {
  color: var(--cloud-white);
  border-bottom-color: var(--electric-orange);
  background: rgba(255, 108, 10, 0.08);
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-status {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--ice-blue);
  padding: 0.3rem 0.7rem;
  border: 1px solid rgba(160, 200, 224, 0.2);
  border-radius: 999px;
  white-space: nowrap;
}

.status-dot {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--neon-green);
  box-shadow: 0 0 8px var(--neon-green);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.4;
    transform: scale(0.7);
  }
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0.5rem;
  background: transparent;
  border: 1px solid rgba(160, 200, 224, 0.25);
  cursor: pointer;
  border-radius: 0.2rem;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--cloud-white);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.header-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.04);
}

.header-progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--electric-orange), var(--neon-green));
}

.site-footer {
  background: linear-gradient(180deg, var(--deep-space-blue) 0%, var(--space-blue-alt) 100%);
  border-top: 1px solid rgba(255, 108, 10, 0.25);
  margin-top: 4rem;
}

.footer-inner {
  max-width: var(--content-max);
  margin-inline: auto;
  padding: 3rem 2rem 2rem;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1.4fr;
  gap: 3rem;
}

.footer-brand .brand {
  margin-bottom: 1rem;
}

.footer-brand .brand-text {
  font-size: 1.3rem;
}

.footer-tagline {
  font-family: var(--font-data);
  color: var(--neon-green);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.footer-statement {
  border-left: 3px solid var(--electric-orange);
  padding-left: 1rem;
  color: var(--ice-blue);
  font-size: 0.9rem;
  line-height: 1.8;
  background: linear-gradient(90deg, rgba(255, 108, 10, 0.06), transparent);
}

.footer-links .footer-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
}

.footer-nav a {
  color: var(--ice-blue);
  font-size: 0.9rem;
  text-decoration: none;
  padding: 0.15rem 0;
  transition: color 0.2s;
}

.footer-nav a:hover {
  color: var(--electric-orange);
  text-decoration: none;
}

.footer-heading {
  font-size: 1rem;
  position: relative;
  padding-bottom: 0.6rem;
  margin-bottom: 1.2rem;
}

.footer-heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 2rem;
  height: 2px;
  background: var(--electric-orange);
}

.contact-list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
}

.contact-list li {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
  color: var(--ice-blue);
  font-size: 0.9rem;
}

.contact-label {
  flex: none;
  min-width: 3.5rem;
  color: var(--slate-gray);
  font-family: var(--font-data);
  font-size: 0.75rem;
  align-self: center;
}

.footer-services {
  color: var(--slate-gray);
  font-size: 0.85rem;
}

.footer-bottom {
  max-width: var(--content-max);
  margin-inline: auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  color: var(--slate-gray);
  font-size: 0.85rem;
  border-top: 1px solid rgba(160, 200, 224, 0.12);
}

.footer-bottom p {
  margin: 0;
}

.to-top {
  --progress: 0%;
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 900;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 50%;
  border: 1px solid rgba(160, 200, 224, 0.3);
  background: conic-gradient(var(--electric-orange) var(--progress), rgba(255, 255, 255, 0.08) 0);
  opacity: 0;
  visibility: hidden;
  transform: translateY(1rem);
  cursor: pointer;
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.to-top-icon {
  position: absolute;
  inset: 5px;
  display: grid;
  place-items: center;
  background: var(--deep-space-blue);
  border-radius: 50%;
  color: var(--cloud-white);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.2rem;
}

@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }

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

  .split-layout {
    grid-template-columns: 1fr;
  }

  .split-aside {
    position: static;
  }
}

@media (max-width: 900px) {
  .header-inner {
    padding: 0 1.25rem;
  }

  .header-nav {
    display: none;
  }

  .header-nav[data-open] {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: 1rem 1.25rem 1.5rem;
    background: rgba(11, 27, 46, 0.97);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(160, 200, 224, 0.2);
  }

  .header-nav[data-open] .nav-list {
    flex-direction: column;
  }

  .header-nav[data-open] .nav-link {
    padding: 0.8rem 0.75rem;
    border-bottom: 1px solid rgba(160, 200, 224, 0.1);
    border-left: 3px solid transparent;
  }

  .header-nav[data-open] .nav-link[aria-current="page"] {
    border-left-color: var(--electric-orange);
    border-bottom-color: transparent;
    background: rgba(255, 108, 10, 0.08);
  }

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

  .header-status {
    display: none;
  }
}

@media (max-width: 700px) {
  .container {
    padding-inline: 1rem;
  }

  .header-inner {
    padding: 0 1rem;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2.5rem 1rem 1.5rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem;
  }

  .grid-cols-3,
  .grid-cols-2 {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 3rem 0;
  }
}

@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;
  }
}