:root {
  --ink: #101214;
  --muted: #6b7074;
  --acid: #a8f500;
  --line: #dfe3e5;
  --paper: #f7f8f6;
  --dark: #111416;
  --max: 1160px;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}
a {
  color: inherit;
  text-decoration: none;
}
.site-header {
  height: 76px;
  padding: 0 5vw;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: fixed;
  inset: 0 0 auto;
  z-index: 10;
  background: rgba(247, 248, 246, 0.86);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(16, 18, 20, 0.06);
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  font-weight: 800;
  letter-spacing: -0.03em;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--ink);
  color: var(--acid);
  font-size: 20px;
  font-style: italic;
  border-radius: 9px;
  box-shadow: 4px 4px 0 var(--acid);
}
.main-nav {
  display: flex;
  gap: 32px;
  font-size: 14px;
  font-weight: 700;
}
.main-nav a {
  transition: color 0.25s;
}
.main-nav a:hover {
  color: #74ae00;
}
.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: none;
  border-radius: 99px;
  padding: 7px 14px;
}
.hero {
  min-height: 720px;
  padding: 150px 5vw 70px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  background:
    linear-gradient(
      110deg,
      rgba(10, 13, 15, 0.98) 3%,
      rgba(10, 13, 15, 0.82) 48%,
      rgba(10, 13, 15, 0.4)
    ),
    url("assets/hero-racing.jpg") center/cover;
}
.hero:after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    125deg,
    transparent 0 58px,
    rgba(168, 245, 0, 0.08) 59px 61px
  );
  mix-blend-mode: screen;
  animation: speed 12s linear infinite;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 880px;
  color: #fff;
}
.eyebrow {
  font:
    700 12px/1.2 ui-monospace,
    SFMono-Regular,
    monospace;
  letter-spacing: 0.16em;
  color: #7e9500;
  margin: 0 0 18px;
}
.hero .eyebrow {
  color: var(--acid);
}
h1,
h2,
h3,
p {
  margin-top: 0;
}
h1 {
  font-size: clamp(46px, 7vw, 92px);
  line-height: 1.02;
  letter-spacing: -0.07em;
  margin-bottom: 22px;
  max-width: 860px;
}
h2 {
  font-size: clamp(32px, 4vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.06em;
  margin-bottom: 20px;
}
h3 {
  font-size: 21px;
  letter-spacing: -0.04em;
  margin-bottom: 10px;
}
.hero-subtitle {
  font-size: clamp(18px, 2vw, 25px);
  color: #dce1e2;
  margin-bottom: 38px;
}
.button {
  display: inline-flex;
  align-items: center;
  gap: 22px;
  padding: 14px 20px;
  border-radius: 999px;
  font-weight: 800;
  transition:
    transform 0.25s,
    box-shadow 0.25s;
}
.button-primary {
  background: var(--acid);
  color: var(--ink);
  box-shadow:
    0 0 0 1px var(--acid),
    0 0 32px rgba(168, 245, 0, 0.3);
}
.button:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(168, 245, 0, 0.25);
}
.hero-panel {
  position: absolute;
  z-index: 2;
  right: 9vw;
  bottom: 15%;
  width: 190px;
  height: 240px;
  border: 1px solid rgba(168, 245, 0, 0.55);
  border-radius: 18px;
  padding: 18px;
  color: var(--acid);
  background: rgba(8, 10, 11, 0.35);
  backdrop-filter: blur(6px);
  transform: rotate(7deg);
  animation: float 5s ease-in-out infinite;
}
.panel-label {
  font:
    12px ui-monospace,
    monospace;
}
.panel-line {
  position: absolute;
  left: 18px;
  right: 18px;
  height: 1px;
  background: rgba(168, 245, 0, 0.5);
}
.panel-line-one {
  top: 72px;
}
.panel-line-two {
  top: 122px;
}
.panel-speed {
  position: absolute;
  bottom: 18px;
  font:
    700 33px/1 ui-monospace,
    monospace;
}
.panel-speed small {
  font-size: 11px;
  letter-spacing: 0.12em;
}
.scroll-hint {
  position: absolute;
  z-index: 2;
  bottom: 26px;
  left: 5vw;
  color: #c7ccce;
  font-size: 12px;
  letter-spacing: 0.08em;
}
.scroll-hint span {
  color: var(--acid);
  font-size: 18px;
  margin-left: 8px;
}
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 120px 5vw;
}
.intro {
  max-width: 920px;
  text-align: center;
}
.intro p:last-child {
  color: var(--muted);
  font-size: 18px;
}
.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  margin-bottom: 42px;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.feature-card {
  position: relative;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: #fff;
  min-height: 280px;
  transition:
    transform 0.3s,
    box-shadow 0.3s;
}
.feature-card:hover {
  transform: translateY(-7px);
  box-shadow: 0 18px 38px rgba(16, 18, 20, 0.1);
}
.feature-number {
  position: absolute;
  right: 24px;
  top: 22px;
  color: #b8bec0;
  font:
    12px ui-monospace,
    monospace;
}
.feature-icon {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 15px;
  background: var(--ink);
  color: var(--acid);
  font-size: 28px;
  margin-bottom: 42px;
}
.feature-card p {
  color: var(--muted);
  font-size: 15px;
}
.qr-section {
  max-width: var(--max);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  background: var(--ink);
  color: #fff;
  border-radius: 28px;
  margin-bottom: 100px;
  padding: 64px 7vw;
}
.qr-section .eyebrow {
  color: var(--acid);
}
.qr-section p:not(.eyebrow) {
  color: #b9c0c2;
}
.qr-wrap {
  flex: none;
  width: 190px;
  text-align: center;
}
.qr-wrap img {
  display: block;
  width: 160px;
  height: 160px;
  object-fit: cover;
  padding: 10px;
  background: #fff;
  border-radius: 14px;
  margin: 0 auto 10px;
}
.qr-wrap span {
  font-size: 11px;
  color: #9da6a8;
}
.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 5vw 36px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted);
  font-size: 12px;
}
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.8s ease,
    transform 0.8s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
@keyframes speed {
  to {
    background-position: 420px 0;
  }
}
@keyframes float {
  50% {
    transform: rotate(4deg) translateY(-10px);
  }
}
@media (max-width: 700px) {
  .site-header {
    height: 64px;
    padding: 0 20px;
  }
  .brand {
    font-size: 13px;
  }
  .brand-mark {
    width: 30px;
    height: 30px;
    font-size: 17px;
  }
  .menu-toggle {
    display: block;
  }
  .main-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    padding: 15px 20px 20px;
    flex-direction: column;
    gap: 12px;
    background: rgba(247, 248, 246, 0.98);
    border-bottom: 1px solid var(--line);
  }
  .main-nav.is-open {
    display: flex;
  }
  .hero {
    min-height: 660px;
    padding: 130px 24px 80px;
    align-items: flex-end;
  }
  .hero-panel {
    right: -42px;
    bottom: 18%;
    opacity: 0.7;
  }
  .hero-content {
    max-width: 100%;
  }
  h1 {
    font-size: clamp(44px, 13vw, 64px);
  }
  .section {
    padding: 76px 24px;
  }
  .intro {
    text-align: left;
  }
  .intro p:last-child {
    font-size: 16px;
  }
  .feature-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .feature-card {
    min-height: 0;
    padding: 26px;
  }
  .feature-icon {
    margin-bottom: 28px;
  }
  .qr-section {
    margin: 0 16px 70px;
    padding: 42px 24px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 28px;
    text-align: center;
  }
  .qr-wrap {
    margin: auto;
  }
  .site-footer {
    padding: 0 24px 28px;
    display: grid;
    gap: 8px;
    text-align: center;
  }
  .scroll-hint {
    left: 24px;
  }
  .eyebrow {
    margin-bottom: 14px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .hero:after,
  .hero-panel {
    animation: none;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .button,
  .feature-card {
    transition: none;
  }
}