:root {
  color-scheme: dark;
  --color-bg: #1A1D24;
  --color-bg-deep: #0D1017;
  --color-surface: #F4F5F7;
  --color-paper: #FEFEFE;
  --color-electric: #2DE1FC;
  --color-purple: #8B5CF6;
  --color-flame: #FF4D00;
  --color-signal: #00FF9F;
  --color-ink: #0D1017;
  --color-muted: #3D4452;
  --shadow: rgba(0,0,0,0.6);
  --font-heading: "Space Grotesk", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --border-width: 3px;
  --max-width: 1200px;
  --gap: 20px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-paper);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

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

ul, ol {
  padding: 0;
  list-style: none;
}

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

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

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

button {
  font: inherit;
  cursor: pointer;
}

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

::selection {
  background: var(--color-flame);
  color: var(--color-bg);
}

#main-content {
  display: block;
  outline: none;
  scroll-margin-top: 20px;
}

.skip-link {
  position: fixed;
  top: -99px;
  left: 16px;
  z-index: 1000;
  display: inline-block;
  padding: 12px 18px;
  background: var(--color-flame);
  color: var(--color-paper);
  font-family: var(--font-heading);
  font-weight: 700;
  border: 3px solid var(--color-ink);
  box-shadow: 6px 6px 0 var(--shadow);
}

.skip-link:focus {
  top: 12px;
  color: var(--color-paper);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1001;
  width: 100%;
  height: 6px;
  background: transparent;
  pointer-events: none;
}

.scroll-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--color-flame), var(--color-purple), var(--color-electric));
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
}

.site-header {
  position: relative;
  z-index: 50;
  overflow: hidden;
  background: var(--color-bg);
  border-bottom: 4px solid var(--color-ink);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(45,225,252,0.08) 0%, transparent 34%, rgba(139,92,246,0.08) 70%, transparent 100%);
  pointer-events: none;
}

.site-header::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 130px;
  height: 100%;
  background: repeating-linear-gradient(-45deg, transparent 0 12px, rgba(255,77,0,0.22) 12px 14px, transparent 14px 24px);
  opacity: 0.5;
  pointer-events: none;
}

.site-masthead {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: clamp(22px, 4vw, 42px) 20px 14px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  text-decoration: none;
}

.site-brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  background: linear-gradient(135deg, var(--color-flame), #FF8433);
  color: var(--color-bg);
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  border: 3px solid var(--color-ink);
  box-shadow: 7px 7px 0 var(--color-ink);
  transform: rotate(-4deg);
}

.brand-name-group {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-paper);
}

.brand-tagline {
  margin-top: 4px;
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  white-space: nowrap;
  color: var(--color-electric);
  text-transform: uppercase;
}

.site-nav-shell {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(13,16,23,0.66);
  border-top: 2px solid rgba(244,245,247,0.08);
}

.site-nav {
  display: flex;
  justify-content: center;
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px;
  padding: 8px 0;
}

.nav-link {
  position: relative;
  display: block;
  padding: 10px 14px;
  color: var(--color-paper);
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  border: 3px solid transparent;
  text-decoration: none;
  transition: background-color 0.18s ease, color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.nav-link:hover {
  color: var(--color-bg);
  background: var(--color-electric);
  border-color: var(--color-electric);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 4px 4px 0 var(--color-flame);
}

.nav-link[aria-current="page"] {
  background: var(--color-flame);
  border-color: var(--color-flame);
  color: var(--color-paper);
  box-shadow: 4px 4px 0 var(--color-electric);
}

.nav-link[aria-current="page"]:hover {
  color: var(--color-bg);
  background: var(--color-flame);
  border-color: var(--color-flame);
  box-shadow: none;
  transform: none;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--color-bg);
  color: var(--color-paper);
  border: 3px solid var(--color-paper);
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1;
  border-radius: 0;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.nav-toggle:hover {
  background: var(--color-electric);
  border-color: var(--color-electric);
  color: var(--color-bg);
}

.nav-toggle[aria-expanded="true"] {
  background: var(--color-flame);
  border-color: var(--color-flame);
  color: var(--color-paper);
}

.nav-toggle-box {
  display: grid;
  gap: 4px;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 3px;
  background: currentColor;
  transition: transform 0.18s ease, opacity 0.18s ease;
}

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

.site-footer {
  position: relative;
  margin-top: 80px;
  background: var(--color-bg-deep);
  border-top: 6px solid var(--color-ink);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--color-flame) 0 25%, var(--color-electric) 25% 50%, var(--color-purple) 50% 75%, var(--color-signal) 75% 100%);
}

.footer-dir {
  display: grid;
  grid-template-columns: 1.1fr 2fr;
  gap: clamp(28px, 5vw, 64px);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 52px 20px 36px;
}

.footer-brand {
  display: grid;
  align-content: start;
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-paper);
}

.footer-brand-note {
  margin-top: 4px;
  color: var(--color-electric);
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.footer-trust {
  margin-top: 20px;
  padding-left: 14px;
  border-left: 4px solid var(--color-flame);
  color: var(--color-paper);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.footer-block {
  display: grid;
  align-content: start;
  gap: 10px;
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-flame);
}

.footer-links,
.footer-contact {
  display: grid;
  gap: 8px;
  font-size: 0.9rem;
  color: rgba(244,245,247,0.72);
}

.footer-links a {
  color: rgba(244,245,247,0.8);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.footer-links a:hover {
  color: var(--color-electric);
  border-color: var(--color-electric);
}

.footer-legal {
  padding: 14px 20px;
  background: rgba(255,77,0,0.1);
  border-top: 1px solid rgba(244,245,247,0.08);
  text-align: center;
  color: rgba(244,245,247,0.72);
  font-size: 0.85rem;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 32px);
}

.section-block {
  padding: clamp(40px, 8vw, 84px) 0;
}

.section-kicker {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-flame);
  margin-bottom: 6px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  line-height: 1.1;
  color: var(--color-paper);
  margin-bottom: 12px;
}

.section-lead {
  max-width: 760px;
  color: rgba(244,245,247,0.8);
  margin-bottom: 24px;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 18px 0;
  font-size: 0.85rem;
}

.breadcrumbs li {
  display: inline-flex;
  align-items: center;
}

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--color-muted);
}

.breadcrumbs a {
  color: var(--color-electric);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--color-flame);
  text-decoration: underline;
}

.breadcrumbs [aria-current="page"] {
  color: var(--color-paper);
  font-weight: 700;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 20px;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  border: 3px solid var(--color-ink);
  border-radius: 0;
  background: var(--color-electric);
  color: var(--color-bg);
  box-shadow: 5px 5px 0 var(--color-ink);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}

.btn:hover {
  color: var(--color-bg);
  text-decoration: none;
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--color-flame);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--color-ink);
}

.btn-primary {
  background: var(--color-flame);
  color: var(--color-paper);
}

.btn-primary:hover {
  color: var(--color-paper);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-ink);
}

.btn-ghost {
  background: transparent;
  color: var(--color-electric);
  box-shadow: 0 0 0 3px var(--color-electric);
}

.btn-ghost:hover {
  color: var(--color-electric);
  box-shadow: 5px 5px 0 var(--color-purple);
}

.grid {
  display: grid;
  gap: var(--gap);
}

.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));
}

.card {
  padding: clamp(18px, 3vw, 26px);
  background: var(--color-surface);
  color: var(--color-ink);
  border: 4px solid var(--color-ink);
  box-shadow: 8px 8px 0 var(--shadow);
}

.card h1,
.card h2,
.card h3,
.card h4 {
  color: var(--color-ink);
  font-family: var(--font-heading);
}

.media-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-electric) 0%, var(--color-purple) 100%);
  border: 4px solid var(--color-ink);
  box-shadow: 8px 8px 0 var(--shadow);
}

.media-frame::after {
  content: "火博体育 / 影像档案";
  position: absolute;
  right: 8px;
  bottom: 8px;
  padding: 2px 7px;
  background: var(--color-electric);
  color: var(--color-bg);
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  border: 2px solid var(--color-ink);
}

.media-cut {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.media-cut img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tag {
  display: inline-block;
  padding: 3px 8px;
  background: var(--color-purple);
  color: var(--color-paper);
  border: 2px solid var(--color-ink);
  font-family: var(--font-heading);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.live-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-signal);
  box-shadow: 0 0 0 4px rgba(0, 255, 159, 0.18);
}

.live-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-signal);
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.stat {
  display: grid;
  gap: 4px;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--color-electric);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(244,245,247,0.78);
}

.path-track {
  position: relative;
  display: grid;
  gap: 0;
  margin-top: 28px;
}

.path-track::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 20px;
  bottom: 20px;
  width: 4px;
  background: linear-gradient(180deg, var(--color-flame), var(--color-electric), var(--color-purple));
}

.path-step {
  position: relative;
  padding: 0 0 30px 56px;
}

.path-step:last-child {
  padding-bottom: 0;
}

.path-node {
  position: absolute;
  left: 12px;
  top: 14px;
  width: 24px;
  height: 24px;
  background: var(--color-bg);
  border: 4px solid var(--color-electric);
  transform: rotate(45deg);
}

.path-step:nth-child(odd) .path-node {
  border-color: var(--color-flame);
}

.path-content {
  padding: 16px;
  background: var(--color-surface);
  color: var(--color-ink);
  border: 4px solid var(--color-ink);
  box-shadow: 6px 6px 0 var(--shadow);
}

.path-content h3,
.path-content h4 {
  color: var(--color-ink);
  font-family: var(--font-heading);
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-electric);
  font-family: var(--font-heading);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.link-more::after {
  content: "→";
  transition: transform 0.18s ease;
}

.link-more:hover {
  color: var(--color-flame);
  border-color: var(--color-flame);
}

.link-more:hover::after {
  transform: translateX(4px);
}

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

  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 767px) {
  .site-nav-shell {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 10px 20px;
  }

  .site-nav {
    display: none;
    justify-content: stretch;
    flex: none;
    margin: 0;
    padding: 0;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 4px 0;
  }

  .nav-link {
    padding: 12px 10px;
    border-left: 4px solid transparent;
  }

  .nav-toggle {
    display: inline-flex;
    align-self: flex-start;
  }

  .section-kicker {
    font-size: 0.78rem;
  }
}

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

  .footer-dir {
    padding: 40px 20px 32px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .nav-toggle-bar {
    transform: none !important;
  }
}