:root {
  --color-bg: #0A0E27;
  --color-bg-raised: #1B2140;
  --color-orange: #FF6A00;
  --color-neon: #39FF14;
  --color-cyan: #00E5FF;
  --color-mist: #E6E9F5;
  --color-slate: #2A2F4A;
  --color-red: #FF3B30;
  --color-steel: #7A8AB8;
  --border-color: rgba(230, 233, 245, 0.12);
  --font-display: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "SF Mono", "Cascadia Code", Consolas, monospace;
  --radius: 0;
  --header-z: 100;
}

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

html {
  background: var(--color-bg);
  scroll-behavior: smooth;
  scrollbar-color: var(--color-slate) var(--color-bg);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  margin: 0;
  background:
    radial-gradient(circle at 18% 8%, rgba(0, 229, 255, 0.08), transparent 28rem),
    radial-gradient(circle at 82% 16%, rgba(255, 106, 0, 0.06), transparent 30rem),
    linear-gradient(180deg, #0A0E27 0%, #070A1A 100%);
  color: var(--color-mist);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

ul,
ol {
  list-style: none;
}

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

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

button {
  font: inherit;
  cursor: pointer;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
}

::selection {
  background: var(--color-orange);
  color: #ffffff;
}

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

a:focus-visible,
button:focus-visible {
  outline-color: var(--color-orange);
}

#main-content {
  flex: 1;
  scroll-margin-top: 8rem;
}

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

.container {
  width: min(1120px, calc(100% - 2rem));
  margin-inline: auto;
}

.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: 1rem;
  top: -100%;
  z-index: 200;
  background: var(--color-orange);
  color: #ffffff;
  font-weight: 700;
  padding: 0.75rem 1.25rem;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--header-z);
  background: rgba(10, 14, 39, 0.94);
  border-bottom: 1px solid var(--border-color);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.header-top {
  background: rgba(10, 14, 39, 0.7);
  border-bottom: 1px solid rgba(230, 233, 245, 0.06);
}

.header-top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 2rem;
}

.header-status {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  color: var(--color-steel);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  color: var(--color-neon);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
}

.live-dot {
  display: inline-block;
  width: 0.45rem;
  height: 0.45rem;
  background: var(--color-neon);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.75);
}

.header-main {
  padding-block: 0.85rem;
}

.header-main-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.875rem;
  min-width: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-orange) 0%, #FFAB00 100%);
  color: #ffffff;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.25rem;
  line-height: 1;
  padding: 0.4rem 0.5rem;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

.brand-text-block {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand-name {
  color: var(--color-mist);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.125rem;
  line-height: 1.2;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.brand-catch {
  color: var(--color-steel);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  line-height: 1.4;
  white-space: nowrap;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.site-nav {
  background: rgba(27, 33, 64, 0.72);
  border-top: 1px solid rgba(0, 229, 255, 0.16);
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 0;
}

.nav-list li {
  display: flex;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 3.25rem;
  padding: 0.75rem 1.25rem;
  color: var(--color-mist);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.04em;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 1rem;
  right: 1rem;
  bottom: 0;
  height: 3px;
  background: var(--color-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s ease;
}

.nav-link:hover {
  color: var(--color-cyan);
  background: rgba(0, 229, 255, 0.05);
}

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

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

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid rgba(0, 229, 255, 0.3);
  background: transparent;
  color: var(--color-mist);
  -webkit-tap-highlight-color: transparent;
}

.nav-toggle-box {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  width: 1.25rem;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(0.4rem) 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(-0.4rem) rotate(-45deg);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-cyan) 0%, var(--color-neon) 50%, var(--color-orange) 100%);
  transition: width 0.2s ease-out;
  pointer-events: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid transparent;
  background: transparent;
  color: var(--color-mist);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.btn:active {
  transform: translateY(2px);
}

.btn-primary {
  background: var(--color-orange);
  border-color: var(--color-orange);
  color: #ffffff;
  box-shadow: 0 8px 30px rgba(255, 106, 0, 0.22);
}

.btn-primary:hover {
  background: #ff7f2a;
  border-color: #ff7f2a;
  color: #ffffff;
}

.btn-ghost {
  border-color: rgba(0, 229, 255, 0.5);
  color: var(--color-cyan);
}

.btn-ghost:hover {
  background: rgba(0, 229, 255, 0.08);
  color: var(--color-cyan);
}

.btn-compact {
  min-height: 2.5rem;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

.site-footer {
  margin-top: auto;
  background: linear-gradient(180deg, #080B1E 0%, #05071A 100%);
  border-top: 1px solid rgba(0, 229, 255, 0.12);
  color: var(--color-steel);
}

.site-footer a {
  color: var(--color-steel);
  transition: color 0.2s ease;
}

.site-footer a:hover {
  color: var(--color-cyan);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr;
  gap: 3rem;
  padding-block: 3.5rem 2.5rem;
}

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

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-mist);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: 0.06em;
}

.footer-logo::before {
  content: "";
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
  background: var(--color-orange);
  box-shadow: 0 0 12px rgba(255, 106, 0, 0.6);
}

.footer-catch {
  margin-block: 0.75rem 1rem;
  color: var(--color-cyan);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
}

.footer-about {
  max-width: 40rem;
  margin-top: 0.75rem;
  color: var(--color-steel);
  font-size: 0.95rem;
  line-height: 1.8;
}

.footer-title {
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(0, 229, 255, 0.2);
  color: var(--color-steel);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.25rem 1rem;
  align-content: start;
}

.footer-route {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0;
  color: var(--color-steel);
  text-decoration: none;
}

.footer-route::before {
  content: "";
  width: 0.375rem;
  height: 0.375rem;
  margin-right: 0.625rem;
  background: var(--color-cyan);
  opacity: 0.7;
  transition: background 0.2s ease;
}

.footer-route:hover {
  color: var(--color-neon);
}

.footer-route:hover::before {
  background: var(--color-neon);
}

.footer-contact p {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  line-height: 1.7;
  word-break: break-word;
}

.footer-bottom {
  border-top: 1px solid rgba(230, 233, 245, 0.08);
  padding-block: 1.25rem;
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: center;
  color: var(--color-steel);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.page-header {
  padding-block: clamp(3rem, 8vw, 6rem) 2rem;
  border-bottom: 1px solid var(--border-color);
}

.page-label {
  margin-bottom: 0.5rem;
  color: var(--color-cyan);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.18em;
}

.page-title {
  color: var(--color-mist);
  font-size: clamp(2.5rem, 7vw, 5rem);
  letter-spacing: -0.02em;
}

.page-subtitle {
  max-width: 62ch;
  margin-top: 1rem;
  color: var(--color-steel);
  font-size: 1.125rem;
}

.breadcrumb {
  margin-block: 1rem 0;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
}

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

.breadcrumb-link {
  color: var(--color-steel);
}

.breadcrumb-link:hover {
  color: var(--color-cyan);
}

.breadcrumb-current {
  color: var(--color-mist);
}

.section {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.section-label {
  display: flex;
  align-items: center;
  color: var(--color-cyan);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.2em;
}

.section-index {
  margin-right: 0.25rem;
  color: var(--color-orange);
}

.section-title {
  margin-top: 0.5rem;
  color: var(--color-mist);
  font-size: clamp(2rem, 5vw, 3rem);
}

.section-intro {
  max-width: 56ch;
  color: var(--color-steel);
}

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

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

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

.card {
  position: relative;
  padding: 1.75rem;
  background: var(--color-bg-raised);
  border: 1px solid var(--border-color);
  transition: border-color 0.25s ease, background 0.25s ease, transform 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  background: #232A4D;
  border-color: rgba(0, 229, 255, 0.45);
}

.card-accent {
  border-left: 4px solid var(--color-orange);
}

.card-title {
  margin-bottom: 0.75rem;
  color: var(--color-mist);
  font-size: 1.25rem;
}

.card-meta {
  color: var(--color-cyan);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.card-body {
  color: var(--color-steel);
  font-size: 0.95rem;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.metric {
  padding: 1.5rem 1rem;
  text-align: center;
  background: rgba(27, 33, 64, 0.6);
  border-top: 2px solid var(--color-cyan);
}

.metric-number {
  color: var(--color-neon);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1;
}

.metric-label {
  margin-top: 0.75rem;
  color: var(--color-steel);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.data-pair {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
}

.data-label {
  color: var(--color-steel);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
}

.data-value {
  color: var(--color-mist);
  font-family: var(--font-mono);
  font-weight: 500;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.625rem;
  border: 1px solid var(--color-slate);
  color: var(--color-steel);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

.tag-orange {
  border-color: rgba(255, 106, 0, 0.5);
  background: rgba(255, 106, 0, 0.08);
  color: var(--color-orange);
}

.tag-green {
  border-color: rgba(57, 255, 20, 0.4);
  background: rgba(57, 255, 20, 0.06);
  color: var(--color-neon);
}

.tag-cyan {
  border-color: rgba(0, 229, 255, 0.4);
  background: rgba(0, 229, 255, 0.06);
  color: var(--color-cyan);
}

.notice {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
  padding: 1rem 1.25rem;
  border-left: 4px solid var(--color-orange);
  background: rgba(255, 106, 0, 0.07);
  color: var(--color-mist);
}

.notice::before {
  content: "!";
  color: var(--color-orange);
  font-family: var(--font-mono);
  font-weight: 500;
}

.media-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #1B2140 0%, #0A0E27 100%);
  border: 1px solid var(--border-color);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, rgba(255, 106, 0, 0.1) 0%, transparent 40%),
    repeating-linear-gradient(90deg, rgba(0, 229, 255, 0.08) 0 1px, transparent 1px 20px);
  pointer-events: none;
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.05) saturate(1.1);
  transition: transform 0.4s ease;
}

.media-frame:hover img {
  transform: scale(1.02);
}

.media-frame-16x9 {
  aspect-ratio: 16 / 9;
}

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

.path-step {
  position: relative;
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: 1.25rem;
  padding: 1.25rem 1.5rem;
  background: rgba(27, 33, 64, 0.4);
  border-left: 1px solid rgba(0, 229, 255, 0.3);
}

.path-step::before {
  content: "";
  position: absolute;
  left: -0.375rem;
  top: 1.5rem;
  width: 0.75rem;
  height: 0.75rem;
  background: var(--color-cyan);
  transform: rotate(45deg);
}

.step-index {
  color: var(--color-orange);
  font-family: var(--font-mono);
  font-size: 2rem;
  line-height: 1;
}

.step-title {
  margin-bottom: 0.25rem;
  color: var(--color-mist);
  font-size: 1.25rem;
}

.step-text {
  color: var(--color-steel);
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

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

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #0D1230;
    border-bottom: 1px solid rgba(0, 229, 255, 0.3);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
  }

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

  .site-nav-inner {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding-block: 0.5rem;
  }

  .nav-list li {
    border-top: 1px solid rgba(230, 233, 245, 0.06);
  }

  .nav-link {
    width: 100%;
    min-height: 3.25rem;
    justify-content: space-between;
  }

  .nav-link[aria-current="page"] {
    background: rgba(57, 255, 20, 0.06);
  }
}

@media (max-width: 640px) {
  .header-top-inner {
    min-height: 1.75rem;
  }

  .header-status {
    font-size: 0.7rem;
  }

  .live-indicator {
    display: none;
  }

  .header-main-inner {
    gap: 0.75rem;
  }

  .header-actions .btn {
    display: none;
  }

  .brand-catch {
    display: none;
  }

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

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

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

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

  .section-heading {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

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

@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;
  }

  .live-dot {
    box-shadow: none;
  }
}