:root {
  --midnight-blue: #0A0E1F;
  --deep-navy: #101736;
  --star-glow: #1E2A5A;
  --line-blue: #2A3563;
  --electric-cyan: #5ADBE8;
  --ember-orange: #FF6A3C;
  --ruby-red: #E63950;
  --golden-amber: #FFC857;
  --text-primary: #F2F4FF;
  --text-secondary: #AAB4D6;
  --font-display: "Noto Serif SC", "Source Han Serif SC", "STSong", serif;
  --font-accent: "JetBrains Mono", "Roboto Mono", monospace;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", sans-serif;
  --header-height: 64px;
  --container-max: 1440px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.75;
  background: var(--midnight-blue);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

main {
  flex: 1 0 auto;
}

ul,
ol {
  list-style: none;
}

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

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

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

:focus-visible {
  outline: 2px solid var(--golden-amber);
  outline-offset: 2px;
}

::selection {
  background: rgba(255, 106, 60, 0.3);
  color: #fff;
}

.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1002;
  padding: 8px 16px;
  background: var(--ember-orange);
  color: var(--midnight-blue);
  font-family: var(--font-accent);
  font-size: 0.85rem;
  border-radius: 0 0 6px 0;
}

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

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

.site-header.is-scrolled {
  background: rgba(10, 14, 31, 0.92);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom-color: rgba(42, 53, 99, 0.6);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.header-inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: var(--header-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text-primary);
  flex-shrink: 0;
}

.brand-mark {
  position: relative;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 2px solid rgba(90, 219, 232, 0.7);
  background: radial-gradient(circle at 35% 35%, rgba(255, 255, 255, 0.9) 0 8%, rgba(230, 57, 80, 0.2) 55%, rgba(10, 14, 31, 0.2) 100%);
  flex-shrink: 0;
}

.brand-mark::before {
  content: "";
  position: absolute;
  top: 50%;
  left: -12%;
  width: 124%;
  height: 5px;
  background: linear-gradient(90deg, var(--golden-amber), var(--ruby-red), var(--golden-amber));
  transform: rotate(-18deg);
  border-radius: 2px;
  box-shadow: 0 0 12px rgba(255, 200, 87, 0.5);
}

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

.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.brand-tagline {
  font-family: var(--font-accent);
  font-size: 0.65rem;
  color: var(--electric-cyan);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  font-family: var(--font-accent);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  border-radius: 2px;
  position: relative;
  white-space: nowrap;
  transition: color 0.2s, background-color 0.2s;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: var(--ember-orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s var(--ease-out);
}

.nav-link:hover {
  color: var(--electric-cyan);
  background: rgba(90, 219, 232, 0.08);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--electric-cyan);
  background: rgba(90, 219, 232, 0.12);
}

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid rgba(242, 244, 255, 0.2);
  border-radius: 0;
  padding: 10px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  transition: transform 0.25s var(--ease-out), opacity 0.2s;
}

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

.read-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--electric-cyan), var(--ember-orange));
  transition: width 0.1s linear;
}

.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--deep-navy);
  color: var(--text-secondary);
  border-top: 1px solid rgba(42, 53, 99, 0.5);
  padding: clamp(40px, 6vw, 72px) 0 24px;
  margin-top: auto;
}

.site-footer::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -80px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  border: 1px solid rgba(90, 219, 232, 0.08);
  transform: translateX(-50%);
  pointer-events: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  left: 50%;
  top: -80px;
  width: 800px;
  height: 800px;
  border-radius: 50%;
  border: 1px solid rgba(255, 106, 60, 0.05);
  transform: translateX(-50%);
  pointer-events: none;
}

.footer-inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
  position: relative;
  z-index: 1;
}

.footer-motto {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 3vw, 2rem);
  text-align: center;
  color: var(--text-primary);
  letter-spacing: 0.08em;
  margin-bottom: clamp(24px, 4vw, 48px);
}

.footer-motto span {
  color: var(--ember-orange);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1.5fr;
  gap: 40px;
  align-items: start;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(42, 53, 99, 0.4);
}

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

.footer-brand-description {
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 30ch;
}

.footer-nav h2,
.footer-contact h2 {
  font-family: var(--font-accent);
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--electric-cyan);
  margin-bottom: 16px;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-nav a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer-nav a:hover {
  color: var(--text-primary);
}

.footer-contact address {
  font-style: normal;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding-top: 20px;
  font-family: var(--font-accent);
  font-size: 0.78rem;
  color: rgba(170, 180, 214, 0.75);
}

.content {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
  padding-block: clamp(48px, 8vw, 96px);
}

.prose {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.prose p {
  margin-bottom: 1.2em;
}

.prose h2,
.prose h3 {
  font-family: var(--font-display);
  font-weight: 900;
  margin-top: 1.6em;
  margin-bottom: 0.5em;
}

.prose a {
  color: var(--electric-cyan);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-family: var(--font-accent);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid transparent;
  border-radius: 0;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.btn-primary {
  background: var(--ember-orange);
  color: var(--midnight-blue);
  border-color: var(--ember-orange);
}

.btn-primary:hover {
  background: #ff845a;
  box-shadow: 0 4px 20px rgba(255, 106, 60, 0.4);
  transform: translateY(-2px);
}

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

.btn-ghost:hover {
  background: rgba(90, 219, 232, 0.1);
}

.breadcrumbs {
  font-family: var(--font-accent);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
  padding: 16px 0;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: var(--line-blue);
}

.breadcrumbs a {
  color: var(--electric-cyan);
}

.breadcrumbs a[aria-current="page"] {
  color: var(--text-primary);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: linear-gradient(180deg, rgba(16, 23, 54, 0.9), rgba(16, 23, 54, 0.7));
  border: 1px solid transparent;
  border-top-color: rgba(90, 219, 232, 0.3);
  border-left-color: rgba(90, 219, 232, 0.1);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
  padding: clamp(20px, 3vw, 32px);
  transition: transform 0.25s var(--ease-out), border-color 0.25s;
}

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

.section {
  padding-block: clamp(48px, 8vw, 96px);
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.section-index {
  font-family: var(--font-accent);
  color: var(--ember-orange);
  font-size: 0.9rem;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  line-height: 1.2;
}

.section-sub {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.media-placeholder {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--deep-navy);
  border: 1px solid var(--line-blue);
  aspect-ratio: 16 / 9;
  color: var(--text-secondary);
  font-family: var(--font-accent);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  overflow: hidden;
}

.media-placeholder::before {
  content: attr(data-label);
  z-index: 1;
  opacity: 0.7;
}

.media-placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 20%, rgba(90, 219, 232, 0.05) 40%, transparent 60%);
  background-size: 200% 200%;
  animation: mediaShimmer 4s linear infinite;
}

@keyframes mediaShimmer {
  0% { background-position: 0% 0%; }
  100% { background-position: 200% 0%; }
}

[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}

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

@media (max-width: 1023px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    padding: 16px clamp(16px, 4vw, 48px) 24px;
    background: rgba(10, 14, 31, 0.98);
    border-bottom: 1px solid var(--line-blue);
    transform: translateY(-110%);
    visibility: hidden;
    transition: transform 0.3s var(--ease-out), visibility 0.3s;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-link {
    padding: 12px 8px;
    font-size: 0.9rem;
  }
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

@media (max-width: 767px) {
  .header-inner {
    height: 56px;
  }

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

  .brand-mark {
    width: 32px;
    height: 32px;
  }
}

@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;
  }

  .site-header,
  .nav-toggle-bar,
  .nav-link,
  .card,
  .btn,
  .site-nav,
  .media-placeholder::after,
  [data-reveal] {
    transition: none !important;
    animation: none !important;
  }

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