:root {
  color-scheme: light;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, sans-serif;
  color: #171717;
  background: #fffdf8;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 6% 14%, rgba(180, 255, 92, 0.22), transparent 19rem),
    radial-gradient(circle at 92% 28%, rgba(98, 198, 255, 0.2), transparent 22rem),
    #fffdf8;
}
a { color: inherit; }
.site-header, main, footer { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.site-header { display: flex; align-items: center; justify-content: space-between; min-height: 80px; }
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 850;
  letter-spacing: -0.03em;
  text-decoration: none;
}
.brand-mark {
  display: grid;
  place-items: center;
  background: #1d1d1d;
  color: #fff;
  font-family: ui-monospace, "SFMono-Regular", monospace;
  font-weight: 900;
}
.brand-mark { width: 34px; height: 34px; border-radius: 11px; box-shadow: 4px 4px 0 #ff5fac; }
.live-entry {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 2px solid #171717;
  border-radius: 999px;
  background: #b5ff5d;
  box-shadow: 3px 3px 0 #171717;
  font-size: 13px;
  font-weight: 850;
  text-decoration: none;
}
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(380px, 0.9fr);
  align-items: center;
  gap: clamp(48px, 8vw, 110px);
  min-height: min(720px, calc(100vh - 80px));
  padding: 72px 0 96px;
}
.eyebrow {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 18px;
  font-family: ui-monospace, "SFMono-Regular", monospace;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
}
.eyebrow span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #ff5fac;
  box-shadow: 14px 0 #ffd83d, 28px 0 #60c7ff;
  margin-right: 28px;
}
h1, h2, h3, p { margin-top: 0; }
h1 {
  max-width: 680px;
  margin-bottom: 25px;
  font-size: clamp(58px, 8vw, 102px);
  line-height: 0.95;
  letter-spacing: -0.075em;
}
h1 em { position: relative; z-index: 0; font-style: normal; white-space: nowrap; }
h1 em::after {
  position: absolute;
  z-index: -1;
  right: -0.08em;
  bottom: 0.03em;
  left: -0.04em;
  height: 0.34em;
  border-radius: 999px;
  background: #b5ff5d;
  content: "";
  transform: rotate(-2deg);
}
.intro {
  max-width: 580px;
  margin-bottom: 30px;
  color: #575757;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.75;
}
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  min-height: 54px;
  padding: 0 22px;
  border: 2px solid #171717;
  border-radius: 16px;
  font-size: 15px;
  font-weight: 800;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease;
}
.button-primary { background: #ffd83d; box-shadow: 5px 5px 0 #171717; }
.button-secondary { background: #fff; }
.button:hover { transform: translate(-2px, -2px); }
.button-primary:hover { box-shadow: 7px 7px 0 #171717; }
.button:focus-visible, .qq-banner a:focus-visible {
  outline: 4px solid rgba(102, 91, 255, 0.28);
  outline-offset: 4px;
}
.platform-note { margin: 22px 0 0; color: #777; font-size: 13px; }
.skin-preview {
  position: relative;
  width: min(100%, 480px);
  margin: 0;
  justify-self: center;
  border: 3px solid #171717;
  border-radius: 30px;
  background: #f8f7ff;
  box-shadow: 16px 18px 0 #b5ff5d, -18px -18px 0 #ff8bc2;
  transform: rotate(2deg);
  overflow: visible;
}
.preview-dots {
  display: flex;
  gap: 7px;
  height: 48px;
  align-items: center;
  padding: 0 18px;
  border-bottom: 3px solid #171717;
}
.preview-dots i {
  width: 11px;
  height: 11px;
  border: 2px solid #171717;
  border-radius: 50%;
  background: #ff5fac;
}
.preview-dots i:nth-child(2) { background: #ffd83d; }
.preview-dots i:nth-child(3) { background: #65d7aa; }
.skin-preview > img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 0 0 27px 27px;
}
.skin-preview figcaption {
  position: absolute;
  right: 18px;
  bottom: 16px;
  padding: 8px 12px;
  border: 2px solid #171717;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 3px 3px 0 #171717;
  font-size: 11px;
  font-weight: 850;
}
.sticker {
  position: absolute;
  padding: 10px 16px;
  border: 2px solid #171717;
  border-radius: 999px;
  box-shadow: 4px 4px 0 #171717;
  font-size: 13px;
  font-weight: 850;
}
.sticker-pink { top: 18%; right: -38px; background: #ff8bc2; transform: rotate(7deg); }
.sticker-blue { bottom: 12%; left: -44px; background: #68d2ff; transform: rotate(-8deg); }
.features { padding: 90px 0 110px; }
.section-heading { margin-bottom: 38px; }
.section-heading p, .qq-kicker {
  margin-bottom: 8px;
  color: #665bff;
  font-size: 13px;
  font-weight: 850;
  letter-spacing: 0.1em;
}
h2 { margin-bottom: 0; font-size: clamp(36px, 5vw, 58px); line-height: 1.05; letter-spacing: -0.055em; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card {
  position: relative;
  min-height: 280px;
  padding: 30px;
  border: 2px solid #171717;
  border-radius: 26px;
  box-shadow: 7px 7px 0 #171717;
}
.feature-yellow { background: #ffe45c; }
.feature-pink { background: #ff92c7; }
.feature-blue { background: #76d6ff; }
.feature-number {
  position: absolute;
  top: 25px;
  right: 26px;
  font-family: ui-monospace, "SFMono-Regular", monospace;
  font-size: 13px;
  font-weight: 800;
}
.feature-icon {
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  margin-bottom: 40px;
  border: 2px solid #171717;
  border-radius: 18px;
  background: #fff;
  font-size: 26px;
}
.feature-card h3 { margin-bottom: 10px; font-size: 25px; letter-spacing: -0.04em; }
.feature-card p { max-width: 290px; margin-bottom: 0; font-size: 15px; line-height: 1.7; }
.qq-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 90px;
  padding: clamp(30px, 5vw, 58px);
  border: 2px solid #171717;
  border-radius: 30px;
  background: #665bff;
  box-shadow: 9px 9px 0 #171717;
  color: #fff;
}
.qq-banner .qq-kicker { color: #b5ff5d; }
.qq-banner h2 { font-size: clamp(32px, 4vw, 48px); }
.qq-banner p:not(.qq-kicker) { max-width: 600px; margin: 16px 0 0; color: rgba(255, 255, 255, 0.78); line-height: 1.7; }
.qq-banner a {
  flex: none;
  padding: 15px 19px;
  border: 2px solid #171717;
  border-radius: 14px;
  background: #b5ff5d;
  box-shadow: 5px 5px 0 #171717;
  color: #171717;
  font-size: 14px;
  font-weight: 850;
  text-decoration: none;
}
footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 0 40px;
  border-top: 1px solid #dedbd4;
  color: #777;
  font-size: 12px;
}
@media (max-width: 850px) {
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 60px; }
  .hero-copy { text-align: center; }
  .eyebrow, .actions { justify-content: center; }
  .intro { margin-inline: auto; }
  .skin-preview { width: min(88vw, 470px); margin-top: 28px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: 230px; }
  .qq-banner { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 520px) {
  .site-header, main, footer { width: min(100% - 28px, 1180px); }
  .site-header { min-height: 68px; }
  .brand > span:last-child { display: none; }
  .live-entry { padding: 9px 12px; font-size: 12px; }
  .hero { padding: 48px 0 78px; }
  h1 { font-size: clamp(52px, 17vw, 76px); }
  .actions { align-items: stretch; flex-direction: column; }
  .button { width: 100%; }
  .skin-preview { width: calc(100% - 20px); box-shadow: 10px 12px 0 #b5ff5d, -10px -10px 0 #ff8bc2; }
  .sticker { display: none; }
  .skin-preview figcaption { right: 10px; bottom: 10px; }
  .features { padding: 72px 0 82px; }
  .feature-card { padding: 26px; }
  footer { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}