:root {
  --color-bg-deep: #071412;
  --color-bg: #0A1E1B;
  --color-bg-surface: #0F2D28;
  --color-accent-blue: #00D4FF;
  --color-accent-blue-soft: #7EE7FF;
  --color-accent-orange: #FF6A00;
  --color-accent-orange-soft: #FFA04D;
  --color-text: #E6F2F0;
  --color-text-dim: #9BB8B3;
  --color-divider: #1C4A42;
  --font-head: "Noto Sans SC", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", "Roboto Mono", monospace;
  --shadow-hard: 6px 6px 0 rgba(0, 0, 0, 0.35);
  --shadow-blue: 0 0 24px rgba(0, 212, 255, 0.25);
  --container-max: 1180px;
  --header-h: auto;
}

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

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

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

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

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  border: none;
  background: none;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--color-accent-blue);
  color: var(--color-bg-deep);
}

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

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 4.5rem);
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.6rem);
}

h3 {
  font-size: 1.25rem;
}

h4 {
  font-size: 1rem;
}

a {
  color: var(--color-accent-blue);
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

a:hover {
  color: var(--color-accent-blue-soft);
}

#main-content {
  scroll-margin-top: 2rem;
}

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

.container-wide {
  width: min(100% - 1.25rem, 1480px);
  margin-inline: auto;
}

.section {
  padding-block: clamp(2rem, 5vw, 4.5rem);
}

.section-tight {
  padding-block: 1.5rem;
}

.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));
}

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

.gap-sm {
  gap: 0.75rem;
}

.gap-lg {
  gap: 2.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 2px solid transparent;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.btn-primary {
  background: var(--color-accent-blue);
  color: var(--color-bg-deep);
  border-color: var(--color-accent-blue);
}

.btn-primary:hover {
  background: var(--color-accent-blue-soft);
  color: var(--color-bg-deep);
  box-shadow: var(--shadow-blue);
}

.btn-accent {
  background: var(--color-accent-orange);
  color: var(--color-bg-deep);
  border-color: var(--color-accent-orange);
}

.btn-accent:hover {
  background: var(--color-accent-orange-soft);
  color: var(--color-bg-deep);
  box-shadow: 0 0 24px rgba(255, 106, 0, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-accent-blue);
}

.btn-outline:hover {
  background: rgba(0, 212, 255, 0.1);
  color: var(--color-text);
}

.tag {
  display: inline-block;
  background: var(--color-bg-deep);
  border: 1px solid var(--color-divider);
  color: var(--color-text-dim);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.6rem;
  line-height: 1.4;
  text-transform: uppercase;
}

.tag-highlight {
  border-color: var(--color-accent-orange);
  color: var(--color-accent-orange-soft);
}

.breadcrumb {
  font-size: 0.875rem;
  padding-block: 1.25rem 2rem;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

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

.breadcrumb a {
  color: var(--color-text-dim);
}

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

.breadcrumb [aria-current] {
  color: var(--color-text);
  font-weight: 600;
}

.ticket-card {
  position: relative;
  padding: 1.5rem;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-divider);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.ticket-card::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-orange));
}

.metric-card {
  position: relative;
  padding: 1.5rem;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-divider);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.metric-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 1.5rem;
  height: 1.5rem;
  background: var(--color-accent-blue);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
}

.metric-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 3vw, 2.75rem);
  font-weight: 700;
  color: var(--color-accent-orange);
  line-height: 1.1;
}

.metric-label {
  display: block;
  margin-top: 0.35rem;
  color: var(--color-text-dim);
  font-size: 0.875rem;
}

.data-ribbon {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 2.5rem;
  padding: 1rem 0;
}

.data-ribbon dl {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
  margin: 0;
}

.data-ribbon dt {
  color: var(--color-text-dim);
  font-size: 0.875rem;
}

.data-ribbon dd {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--color-accent-blue);
  font-weight: 700;
}

.prose {
  max-width: 70ch;
}

.prose p {
  margin-bottom: 1.25rem;
  color: var(--color-text);
}

.prose h2,
.prose h3,
.prose h4 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.prose a {
  text-decoration: underline;
  text-decoration-color: var(--color-accent-orange);
  text-underline-offset: 4px;
}

.prose ul,
.prose ol {
  margin-bottom: 1.25rem;
  padding-left: 1.25rem;
}

.prose ul {
  list-style: square;
  color: var(--color-text);
}

.prose ol {
  list-style: decimal;
  color: var(--color-text);
}

.prose li {
  margin-bottom: 0.5rem;
}

.prose blockquote {
  border-left: 4px solid var(--color-accent-blue);
  background: var(--color-bg-surface);
  padding: 1rem 1.25rem;
  color: var(--color-text-dim);
  margin-bottom: 1.25rem;
}

.image-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-divider);
}

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

/* ========== Header ========== */

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 1000;
  background: var(--color-accent-orange);
  color: var(--color-bg-deep);
  font-weight: 700;
  padding: 0.75rem 1.25rem;
  text-decoration: none;
  transition: top 0.2s ease;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 30, 27, 0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-blue) 0%, var(--color-accent-blue) 48%, var(--color-accent-orange) 48%, var(--color-accent-orange) 100%);
  pointer-events: none;
}

.header-inner {
  position: static;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  line-height: 1.1;
  padding-top: 1.25rem;
  padding-bottom: 0.5rem;
}

.brand-mark {
  width: 2rem;
  height: 2rem;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--color-accent-blue) 0%, var(--color-accent-blue) 40%, var(--color-accent-orange) 40%, var(--color-accent-orange) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 75%, 75% 100%, 0 100%);
}

.brand-name {
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--color-text);
  letter-spacing: 0.03em;
}

.brand-tagline {
  font-size: 0.75rem;
  color: var(--color-text-dim);
  letter-spacing: 0.1em;
  margin-top: 0.15rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.25rem;
  padding-bottom: 0.75rem;
}

.site-nav a {
  padding: 0.5rem 0.9rem;
  color: var(--color-text-dim);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
}

.site-nav a:hover {
  color: var(--color-accent-blue);
  border-color: var(--color-divider);
  background: rgba(0, 212, 255, 0.06);
}

.site-nav a[aria-current="page"] {
  color: var(--color-accent-blue);
  border-color: var(--color-divider);
  background: var(--color-bg-surface);
}

.nav-toggle {
  position: absolute;
  top: 1.25rem;
  right: 1rem;
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 2.5rem;
  height: 2.5rem;
  background: transparent;
  border: 1px solid var(--color-divider);
  gap: 0.3rem;
  padding: 0.4rem;
  cursor: pointer;
}

.nav-toggle-bar {
  width: 100%;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle:hover .nav-toggle-bar {
  background: var(--color-accent-blue);
}

.header-race {
  height: 4px;
  background: linear-gradient(115deg, transparent 0%, transparent 68%, var(--color-accent-blue) 68%, var(--color-accent-blue) 72%, transparent 72%, transparent 76%, var(--color-accent-orange) 76%, var(--color-accent-orange) 80%, transparent 80%);
  opacity: 0.7;
}

.header-dash {
  position: absolute;
  left: 0;
  bottom: 3px;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-blue-soft), var(--color-accent-orange));
  z-index: 2;
  pointer-events: none;
}

/* ========== Footer ========== */

.site-footer {
  position: relative;
  background: var(--color-bg-deep);
  border-top: 1px solid var(--color-divider);
  margin-top: 4rem;
  padding-top: clamp(2.5rem, 6vw, 5rem);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent-orange) 0%, var(--color-accent-orange) 45%, var(--color-accent-blue) 45%, var(--color-accent-blue) 100%);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 2rem 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--color-divider);
}

.site-footer .brand {
  align-items: flex-start;
  text-align: left;
  padding: 0 0 0.75rem 0;
}

.site-footer .brand .brand-tagline {
  letter-spacing: 0.05em;
}

.site-footer a {
  color: var(--color-text-dim);
}

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

.footer-note {
  margin-top: 1rem;
  max-width: 34rem;
  font-size: 0.875rem;
  color: var(--color-text-dim);
  border-left: 3px solid var(--color-accent-blue);
  padding-left: 1rem;
}

.footer-heading {
  font-size: 0.875rem;
  color: var(--color-accent-blue);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.footer-links,
.footer-contact {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.5rem;
}

.footer-contact {
  font-size: 0.9rem;
  color: var(--color-text-dim);
}

.footer-contact li {
  position: relative;
  padding-left: 1.25rem;
}

.footer-contact li::before {
  content: "//";
  position: absolute;
  left: 0;
  color: var(--color-accent-orange);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  top: 0.1em;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-block: 1.5rem 2.5rem;
  font-size: 0.8125rem;
  color: var(--color-text-dim);
}

/* ========== Reveal ========== */

html.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity 0.6s ease, transform 0.6s ease;
  transition-delay: calc(var(--reveal-order, 0) * 60ms);
}

html.js-enabled [data-reveal-visible] {
  opacity: 1;
  transform: none;
}

/* ========== Responsive ========== */

@media (max-width: 960px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .site-nav {
    display: none;
    position: absolute;
    top: calc(100% - 4px);
    left: 0;
    right: 0;
    z-index: 105;
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
    background: var(--color-bg-deep);
    border-top: 1px solid var(--color-divider);
    border-bottom: 1px solid var(--color-divider);
    padding: 1rem;
  }

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

  .site-nav a {
    padding: 1rem;
    background: var(--color-bg);
    border: 1px solid var(--color-divider);
  }

  .site-nav a[aria-current="page"] {
    background: var(--color-bg-surface);
  }

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

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

@media (max-width: 640px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .header-inner {
    padding-top: 0.5rem;
  }

  .brand {
    padding-top: 0.75rem;
  }

  .brand-name {
    font-size: 1.1rem;
  }

  .brand-tagline {
    font-size: 0.65rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    transition-duration: 0.001s !important;
  }
}