:root {
  --deep-space: #0B1D3A;
  --orbit-blue: #16294D;
  --mineral-gray: #9AA8B8;
  --moss-green: #4A7C59;
  --terracotta: #C25436;
  --sand-cream: #F2EDE4;
  --neon-green: #B7FF1A;
  --signal-orange: #FF7A1A;
  --grid-line: rgba(183, 255, 26, 0.18);
  --deep-ink: #050C18;
}

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

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

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  min-height: 100vh;
  background: var(--deep-space);
  color: var(--sand-cream);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 1rem;
  line-height: 1.6;
}

main {
  display: block;
}

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

a:hover {
  color: var(--signal-orange);
}

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

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

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

h1,
h2,
h3,
h4 {
  font-weight: 900;
  color: #FFFFFF;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 4.5rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.5rem);
}

h3 {
  font-size: 1.25rem;
}

.num,
[data-num] {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}

.container {
  width: min(1200px, 100% - 48px);
  margin-inline: auto;
}

@media (max-width: 767px) {
  .container {
    width: calc(100% - 32px);
  }
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 2000;
  background: var(--neon-green);
  color: var(--deep-space);
  padding: 12px 16px;
  font-weight: 700;
  transform: translateY(-160%);
  transition: transform 0.25s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--deep-ink);
  border-bottom: 1px solid var(--grid-line);
}

.site-header__shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 16px;
  height: 64px;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.site-header__logo {
  width: 34px;
  height: 34px;
  background: var(--neon-green);
  color: var(--deep-space);
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  letter-spacing: -0.02em;
  border-radius: 2px;
}

.site-header__name {
  font-weight: 900;
  font-size: 1rem;
  color: var(--sand-cream);
  white-space: nowrap;
}

.site-header__tag {
  display: none;
}

.site-nav {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  width: min(320px, 85vw);
  background: var(--deep-space);
  border-right: 1px solid var(--grid-line);
  box-shadow: 12px 0 32px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: calc(64px + 28px) 20px 24px;
  transform: translateX(-102%);
  visibility: hidden;
  transition: transform 0.35s ease, visibility 0s linear 0.35s;
  z-index: 1001;
}

.site-nav[data-open="true"] {
  transform: translateX(0);
  visibility: visible;
  transition: transform 0.35s ease, visibility 0s;
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 12px;
  color: var(--sand-cream);
  font-weight: 700;
  border-left: 2px solid transparent;
  transition: background 0.25s, border-color 0.25s, color 0.25s;
}

.site-nav__link:hover {
  color: var(--neon-green);
  background: rgba(183, 255, 26, 0.06);
}

.site-nav__link[aria-current="page"] {
  border-left-color: var(--neon-green);
  color: var(--neon-green);
  background: rgba(183, 255, 26, 0.08);
}

.site-nav__index {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--signal-orange);
  min-width: 22px;
  font-variant-numeric: tabular-nums;
}

.site-nav__label {
  font-size: 1rem;
}

.site-header__status {
  display: none;
}

.site-header__toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  color: var(--sand-cream);
}

.site-header__toggle-text {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.site-header__toggle-icon {
  width: 20px;
  height: 14px;
  position: relative;
  display: block;
}

.site-header__toggle-bar,
.site-header__toggle-bar::before,
.site-header__toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--neon-green);
  transition: transform 0.3s ease, background 0.3s ease;
}

.site-header__toggle-bar {
  top: 6px;
}

.site-header__toggle-bar::before {
  top: -6px;
}

.site-header__toggle-bar::after {
  top: 6px;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar {
  background: transparent;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar::before {
  transform: translateY(6px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar::after {
  transform: translateY(-6px) rotate(-45deg);
}

@media (min-width: 768px) {
  body {
    padding-left: 96px;
  }

  .site-header {
    position: fixed;
    inset: 0 auto 0 0;
    width: 96px;
    height: auto;
    border-bottom: none;
    border-right: 1px solid var(--grid-line);
    transition: width 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
    background: var(--deep-ink);
  }

  .site-header:hover,
  .site-header:focus-within {
    width: 260px;
  }

  .site-header__shell {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    height: 100%;
    width: 260px;
    padding: 24px 16px;
  }

  .site-header__brand {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding-bottom: 24px;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--grid-line);
  }

  .site-header__logo {
    width: 44px;
    height: 44px;
    font-size: 18px;
  }

  .site-header__name {
    font-size: 1.2rem;
  }

  .site-header__tag {
    display: block;
    font-size: 0.62rem;
    letter-spacing: 0.18em;
    color: var(--signal-orange);
    font-weight: 700;
  }

  .site-header__name,
  .site-header__tag,
  .site-nav__label,
  .site-header__status-label {
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-8px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
  }

  .site-header:hover .site-header__name,
  .site-header:focus-within .site-header__name,
  .site-header:hover .site-header__tag,
  .site-header:focus-within .site-header__tag,
  .site-header:hover .site-nav__label,
  .site-header:focus-within .site-nav__label,
  .site-header:hover .site-header__status-label,
  .site-header:focus-within .site-header__status-label {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .site-nav {
    position: static;
    top: auto;
    bottom: auto;
    left: auto;
    width: auto;
    height: auto;
    background: transparent;
    border-right: none;
    box-shadow: none;
    padding: 22px 0;
    transform: none;
    transition: none;
    display: flex;
    flex-direction: column;
    flex: 1;
    visibility: visible;
    z-index: auto;
  }

  .site-nav[data-open="true"] {
    transform: none;
  }

  .site-nav__link {
    padding: 14px 10px;
    gap: 14px;
  }

  .site-nav__link:hover {
    background: rgba(183, 255, 26, 0.06);
  }

  .site-header:hover .site-nav__link[aria-current="page"],
  .site-header:focus-within .site-nav__link[aria-current="page"] {
    background: rgba(183, 255, 26, 0.08);
  }

  .site-header__status {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: auto;
    padding-top: 20px;
    border-top: 1px solid var(--grid-line);
    color: var(--mineral-gray);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
  }

  .site-header__dot {
    width: 8px;
    height: 8px;
    background: var(--neon-green);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(183, 255, 26, 0.6);
    animation: statusPulse 2.2s ease-in-out infinite;
    flex-shrink: 0;
  }

  .site-header__toggle {
    display: none;
  }
}

@keyframes statusPulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

.site-footer {
  background: var(--deep-ink);
  border-top: 1px solid var(--grid-line);
  padding: 3rem 0 1.5rem;
  margin-top: clamp(3rem, 8vw, 5rem);
  color: var(--mineral-gray);
}

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

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

.site-footer__topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-bottom: 20px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--grid-line);
}

.site-footer__brand {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--sand-cream);
}

.site-footer__brand:hover {
  color: var(--neon-green);
}

.site-footer__claim {
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  color: var(--signal-orange);
}

.site-footer__columns {
  display: grid;
  grid-template-columns: 0.8fr 1fr 1.4fr;
  gap: 2rem;
  margin-bottom: 32px;
}

.site-footer__heading {
  font-size: 0.85rem;
  font-weight: 900;
  color: var(--sand-cream);
  letter-spacing: 0.1em;
  margin-bottom: 14px;
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.site-footer__bottomline {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 2rem;
  justify-content: space-between;
  align-content: center;
  border-top: 1px solid var(--grid-line);
  padding-top: 18px;
  font-size: 0.8rem;
}

.site-footer__bottomline p {
  margin: 0;
  color: var(--mineral-gray);
}

@media (max-width: 767px) {
  .site-footer__columns {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

.section {
  padding: clamp(3rem, 7vw, 6rem) 0;
  position: relative;
}

.section-head {
  margin-bottom: 3rem;
  max-width: 760px;
}

.section-title {
  margin-top: 0.5rem;
}

.section-desc {
  margin-top: 0.8rem;
  color: var(--mineral-gray);
  max-width: 56ch;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--neon-green);
  text-transform: uppercase;
}

.kicker::before {
  content: "//";
  color: var(--signal-orange);
}

.divider {
  height: 1px;
  background: var(--grid-line);
  border: 0;
  margin: 2rem 0;
}

.surface {
  background: var(--orbit-blue);
  border: 1px solid var(--grid-line);
}

.surface--dark {
  background: var(--deep-ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1;
  border: 1px solid transparent;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s;
}

.btn--primary {
  background: var(--neon-green);
  color: var(--deep-space);
}

.btn--primary:hover {
  background: var(--signal-orange);
  color: var(--deep-ink);
  transform: translateY(-2px);
}

.btn--secondary {
  border-color: var(--neon-green);
  color: var(--neon-green);
  background: transparent;
}

.btn--secondary:hover {
  background: var(--neon-green);
  color: var(--deep-space);
}

.grid {
  display: grid;
  gap: 24px;
}

.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));
}

.grid--5 {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

@media (max-width: 1023px) and (min-width: 768px) {
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid--5 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .grid--2,
  .grid--3,
  .grid--4,
  .grid--5 {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--orbit-blue);
  border: 1px solid var(--grid-line);
  padding: 24px;
  transition: border-color 0.3s, transform 0.3s, background 0.3s;
}

.card:hover {
  border-color: rgba(183, 255, 26, 0.5);
  transform: translateY(-4px);
}

.card__title {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.card__text {
  color: var(--mineral-gray);
  font-size: 0.95rem;
}

.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--orbit-blue);
  border: 1px solid var(--grid-line);
}

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

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

.media-frame--1-1 {
  aspect-ratio: 1 / 1;
}

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

.media-frame__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  text-align: center;
}

.media-frame__placeholder::before {
  content: "K1 · SPORTS DATA";
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  font-weight: 700;
  color: var(--neon-green);
  border: 1px solid var(--grid-line);
  padding: 8px 14px;
  background: rgba(5, 12, 24, 0.5);
}

.timeline {
  display: grid;
  gap: 20px;
}

.timeline__item {
  position: relative;
  padding-left: 28px;
  border-left: 1px solid var(--grid-line);
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 4px;
  width: 9px;
  height: 9px;
  background: var(--signal-orange);
}

.timeline__title {
  font-size: 1.05rem;
}

.timeline__meta {
  font-size: 0.8rem;
  color: var(--signal-orange);
  margin-bottom: 4px;
}

.metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric__value {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--neon-green);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.metric__label {
  color: var(--mineral-gray);
  font-size: 0.85rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 1.5rem;
  font-size: 0.85rem;
  color: var(--mineral-gray);
}

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

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb__link {
  color: var(--mineral-gray);
}

.breadcrumb__link:hover {
  color: var(--neon-green);
}

.breadcrumb__sep {
  color: var(--signal-orange);
}

.grid-lines {
  background-image: linear-gradient(var(--grid-line) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
  transition-delay: var(--reveal-delay, 0ms);
}

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

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

  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    transition-delay: 0s !important;
  }

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