:root {
  --bg: #0A0A0A;
  --panel: #1F1F1F;
  --paper: #F5F0E8;
  --paper-dim: #E8E0D0;
  --blue: #00C2FF;
  --orange: #FF6B00;
  --green: #39FF14;
  --text: #EAEAEA;
  --muted: #B0B0B0;
  --ink: #1A1A1A;
  --line: rgba(245, 240, 232, 0.14);
  --font-head: "Oswald", "Arial Narrow", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "Courier New", monospace;
  --max: 1280px;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1,
h2,
h3,
h4 {
  margin: 0 0 1rem;
  color: var(--text);
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
}

h3 {
  font-size: 1.5rem;
}

p {
  margin: 0 0 1rem;
}

a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  z-index: 10000;
  padding: 0.75rem 1.25rem;
  background: var(--orange);
  color: #0A0A0A;
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s;
}

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

.header-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 900;
  width: 100%;
  height: 3px;
  pointer-events: none;
  background: linear-gradient(90deg, var(--blue), var(--orange) 60%, var(--green));
  opacity: 0.9;
  transform: scaleX(0);
  transform-origin: 0 50%;
}

.site-header {
  position: relative;
  z-index: 100;
  background: var(--bg);
}

.announce-bar {
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.announce-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 2.25rem;
}

.announce-note {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
  margin: 0;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.announce-dot {
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
  flex: none;
  background: var(--green);
  box-shadow: 0 0 0 0.125rem rgba(57, 255, 20, 0.15);
}

.announce-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--blue);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.announce-link:hover {
  color: var(--paper);
}

.announce-link > span {
  display: inline-block;
  transition: transform 0.2s;
}

.announce-link:hover > span {
  transform: translateX(2px);
}

.header-main {
  background: rgba(10, 10, 10, 0.98);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 1.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  color: var(--paper);
  text-decoration: none;
}

.brand-mark {
  width: 2.75rem;
  height: 2.75rem;
  flex: none;
}

.brand-mark .mark-bg {
  fill: #151515;
  stroke: var(--blue);
  stroke-width: 1.5;
}

.brand-mark .mark-speed {
  fill: none;
  stroke: var(--orange);
  stroke-width: 2.2;
  stroke-linecap: square;
  stroke-linejoin: miter;
}

.brand-mark .mark-arrow {
  fill: none;
  stroke: var(--green);
  stroke-width: 2;
  stroke-linecap: square;
  stroke-linejoin: miter;
}

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

.brand-name {
  display: block;
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.brand-name > span {
  color: var(--blue);
}

.brand-slogan {
  display: block;
  margin-top: 0.375rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
}

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

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  min-height: 2.5rem;
  padding: 0.4rem 0.875rem 0.4rem 1.125rem;
  background: linear-gradient(135deg, rgba(255, 107, 0, 0.18), rgba(255, 107, 0, 0.02));
  border: 1px solid transparent;
  border-left: 3px solid var(--orange);
  color: var(--paper);
  font-weight: 700;
  font-size: 0.875rem;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.cta-button:hover {
  background: linear-gradient(135deg, rgba(255, 107, 0, 0.32), rgba(255, 107, 0, 0.04));
  border-color: var(--orange);
  color: var(--orange);
}

.cta-label {
  font-weight: 700;
  line-height: 1.2;
}

.cta-index {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--green);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding: 0 0.875rem;
  background: var(--panel);
  border: 1px solid #2E2E2E;
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 700;
  cursor: pointer;
}

.nav-toggle-label {
  font-size: 0.8125rem;
}

.nav-toggle-icon {
  position: relative;
  width: 1.25rem;
  height: 0.875rem;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after,
.nav-toggle-icon > span {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--blue);
  transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle-icon::before {
  top: 0;
}

.nav-toggle-icon::after {
  bottom: 0;
}

.nav-toggle-icon > span {
  top: calc(50% - 1px);
}

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

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

.nav-toggle[aria-expanded="true"] .nav-toggle-icon > span {
  opacity: 0;
}

.main-nav {
  background: rgba(10, 10, 10, 0.96);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  min-height: 3.25rem;
}

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

.nav-item {
  position: relative;
}

.nav-link {
  position: relative;
  display: block;
  padding: 1rem 0.9rem 1.05rem;
  color: var(--muted);
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: color 0.2s;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0.9rem;
  right: 0.9rem;
  bottom: 0.75rem;
  height: 2px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.25s;
}

.nav-link:hover {
  color: var(--paper);
}

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

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

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

.nav-support {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.75rem;
  border: 1px solid #2E2E2E;
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s;
}

.nav-support:hover {
  border-color: var(--blue);
  color: var(--green);
}

.site-footer {
  position: relative;
  background: #060606;
  color: var(--text);
  border-top: 3px solid var(--orange);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  z-index: 1;
  width: 34%;
  height: 3px;
  background: var(--blue);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.9fr 1.2fr;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(1.5rem, 4vw, 2.5rem);
}

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

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

.footer-about {
  max-width: 38ch;
  margin: 1rem 0 0.75rem;
  color: var(--muted);
  line-height: 1.7;
}

.footer-trust {
  max-width: 42ch;
  margin: 0 0 1rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--blue);
  color: #6A6A6A;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
}

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

.footer-title {
  margin: 0 0 1rem;
  padding-bottom: 0.625rem;
  border-bottom: 1px solid var(--line);
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.footer-links {
  display: grid;
  gap: 0.625rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  color: var(--muted);
  font-size: 0.9375rem;
  text-decoration: none;
  transition: color 0.2s, padding-left 0.2s;
}

.footer-links a:hover {
  padding-left: 0.25rem;
  color: var(--blue);
}

.footer-contact-list {
  display: grid;
  gap: 0.5rem;
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
}

.footer-contact-list li {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.5;
}

.footer-support,
.footer-note {
  margin: 0 0 0.5rem;
  color: #6A6A6A;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
}

.footer-bottom {
  background: #040404;
  border-top: 1px solid var(--line);
}

.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-block: 1.25rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.footer-copyright,
.footer-icp {
  margin: 0;
}

.section {
  padding-block: clamp(3rem, 7vw, 5rem);
}

.section--tight {
  padding-block: clamp(1.5rem, 3vw, 2.5rem);
}

.section--paper {
  background: var(--paper);
  color: var(--ink);
}

.section--paper h1,
.section--paper h2,
.section--paper h3,
.section--paper h4 {
  color: #0A0A0A;
}

.section--paper .section-desc {
  color: #3A3A3A;
}

.page-main {
  padding-block: clamp(2rem, 6vw, 4.5rem);
}

#main-content {
  display: block;
  min-height: 60vh;
  scroll-margin-top: 1.5rem;
}

.section-head {
  max-width: 52rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.section-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 0.75rem;
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section-eyebrow::before {
  content: "";
  width: 2rem;
  height: 1px;
  background: var(--green);
}

.section-title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
}

.section-desc {
  max-width: 62ch;
  margin: 0 0 1.5rem;
  color: var(--muted);
}

.display-title {
  position: relative;
  margin: 0 0 1rem;
  font-family: var(--font-head);
  font-size: clamp(2.75rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.display-title::before {
  content: "";
  display: block;
  width: 64px;
  height: 5px;
  margin-bottom: 1rem;
  background: linear-gradient(90deg, var(--blue), var(--orange));
  transform: skewX(-20deg);
}

.stamp-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--orange);
  background: rgba(255, 107, 0, 0.05);
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.index-label {
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
}

.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;
  border-radius: 0;
  background: transparent;
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s;
}

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

.btn-primary {
  background: var(--orange);
  border-color: var(--orange);
  color: #0A0A0A;
  box-shadow: 4px 4px 0 rgba(0, 194, 255, 0.18);
}

.btn-primary:hover {
  background: #FF7A1A;
  border-color: #FF7A1A;
  color: #0A0A0A;
  box-shadow: 6px 6px 0 rgba(0, 194, 255, 0.22);
}

.btn-outline {
  border-color: var(--blue);
  background: rgba(0, 194, 255, 0.06);
  color: var(--blue);
}

.btn-outline:hover {
  background: var(--blue);
  border-color: var(--blue);
  color: #0A0A0A;
}

.breadcrumb {
  margin: 0 0 2rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

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

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: var(--green);
}

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

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

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

.grid {
  display: grid;
  gap: var(--space-5);
}

.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));
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  align-items: start;
  gap: var(--space-5);
}

.bento-card {
  position: relative;
  grid-column: span 4;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: clamp(1.25rem, 3vw, 2rem);
  transition: transform 0.2s, border-color 0.2s, background 0.2s;
}

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

.bento-card--wide {
  grid-column: span 6;
}

.bento-card--full {
  grid-column: 1 / -1;
}

.bento-card--paper {
  background: var(--paper);
  border-color: transparent;
  color: var(--ink);
  box-shadow: 6px 6px 0 rgba(0, 194, 255, 0.12);
}

.bento-card--paper h3 {
  color: #0A0A0A;
}

.bento-card--tilt {
  transform: rotate(-0.75deg);
}

.bento-card--tilt-reverse {
  transform: rotate(0.75deg);
}

.bento-card--tilt:hover,
.bento-card--tilt-reverse:hover {
  transform: translateY(-4px) rotate(0deg);
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: clamp(1.25rem, 3vw, 2rem);
}

.card--paper {
  background: var(--paper);
  border-color: var(--paper-dim);
  color: var(--ink);
}

.card--paper h3 {
  color: #0A0A0A;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.25rem;
  background: rgba(0, 194, 255, 0.06);
  border-left: 2px solid var(--blue);
}

.stat-number {
  margin: 0;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 700;
  line-height: 1;
}

.stat-label {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
}

.speed-line {
  position: relative;
  overflow: hidden;
}

.speed-line::after {
  content: "";
  position: absolute;
  top: -10%;
  right: -5%;
  width: 40%;
  height: 120%;
  background: repeating-linear-gradient(115deg, transparent 0 10px, rgba(0, 194, 255, 0.16) 10px 12px, transparent 12px 26px);
  pointer-events: none;
  transform: skewX(-12deg);
}

.speed-line > * {
  position: relative;
  z-index: 1;
}

.hero-frame {
  position: relative;
  padding: clamp(1.5rem, 5vw, 3.5rem);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(0, 194, 255, 0.08), rgba(255, 107, 0, 0.05));
}

.hero-frame::before {
  content: "";
  position: absolute;
  inset: 1rem;
  border: 1px solid rgba(245, 240, 232, 0.35);
  pointer-events: none;
}

.hero-frame::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--blue), var(--orange), var(--green));
  pointer-events: none;
}

.media-frame {
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
}

.media-frame--wide {
  aspect-ratio: 21 / 9;
}

.media-frame--tall {
  aspect-ratio: 3 / 4;
}

.media-frame img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.media-frame--placeholder::before {
  content: "赛事影像";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, transparent 45%, rgba(0, 194, 255, 0.12) 45%, rgba(0, 194, 255, 0.12) 47%, transparent 47%), linear-gradient(45deg, transparent 45%, rgba(255, 107, 0, 0.1) 45%, rgba(255, 107, 0, 0.1) 47%, transparent 47%);
  background-size: 32px 32px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
}

.prose {
  max-width: 75ch;
}

.prose p {
  margin: 0 0 1rem;
}

.prose h2 {
  margin-top: 2rem;
}

.prose ul,
.prose ol {
  margin: 0 0 1rem 1.25rem;
  padding: 0;
}

.prose li + li {
  margin-top: 0.5rem;
}

.prose blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  background: rgba(255, 107, 0, 0.05);
  border-left: 3px solid var(--orange);
  color: var(--muted);
}

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

@media (max-width: 1100px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 980px) {
  .header-inner {
    padding-block: 1rem;
  }

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

  .main-nav {
    display: none;
  }

  .main-nav[data-open] {
    display: block;
    border-top: 1px solid var(--line);
  }

  .nav-inner {
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    padding-block: 1rem;
  }

  .nav-menu {
    align-items: stretch;
    flex-direction: column;
    gap: 0;
  }

  .nav-item {
    border-bottom: 1px solid rgba(245, 240, 232, 0.08);
  }

  .nav-link {
    padding: 1rem 0.25rem;
  }

  .nav-link::after {
    content: none;
  }

  .nav-link[aria-current="page"] {
    padding-left: 1rem;
    border-left: 3px solid var(--orange);
    color: var(--blue);
  }

  .nav-support {
    display: block;
    justify-content: center;
    margin-top: 1rem;
    padding: 0.75rem;
    text-align: center;
  }

  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .bento-card,
  .bento-card--wide {
    grid-column: 1 / -1;
  }
}

@media (max-width: 700px) {
  .announce-note {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .announce-link {
    display: none;
  }

  .brand-mark {
    width: 2.25rem;
    height: 2.25rem;
  }

  .brand-name {
    font-size: 1.25rem;
  }

  .brand-slogan {
    display: none;
  }

  .cta-button {
    padding: 0.5rem 0.75rem;
  }

  .cta-index {
    display: none;
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }
}