:root {
  color-scheme: light;
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: #dcecff;
  color: #102b55;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 50% 10%, rgba(255, 255, 255, 0.95), transparent 36%),
    linear-gradient(145deg, #9cc8f5 0%, #eaf5ff 55%, #bfdcf7 100%);
}

.hero {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.window {
  width: min(720px, 100%);
  overflow: hidden;
  border: 1px solid #3972ac;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow:
    0 28px 70px rgba(23, 72, 124, 0.24),
    inset 0 0 0 1px rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(18px);
}

.titlebar {
  display: flex;
  align-items: center;
  gap: 9px;
  height: 42px;
  padding: 0 15px;
  border-bottom: 1px solid #285d9a;
  background: linear-gradient(#4d9fea, #2869ae);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  text-shadow: 0 1px 1px rgba(0, 32, 80, 0.45);
}

.penguin {
  display: grid;
  width: 20px;
  height: 20px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 50%;
  background: #152c47;
  color: #f7d653;
  font-size: 10px;
}

.window-controls {
  margin-left: auto;
  letter-spacing: 7px;
  opacity: 0.9;
}

.content {
  padding: clamp(56px, 10vw, 96px) clamp(24px, 8vw, 76px);
  text-align: center;
}

.project-logo {
  display: block;
  width: clamp(118px, 23vw, 164px);
  height: auto;
  margin: 0 auto 28px;
  border-radius: 24%;
  filter: drop-shadow(0 14px 22px rgba(31, 65, 145, 0.2));
}

.eyebrow {
  margin: 0 0 14px;
  color: #3276b8;
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
}

h1 {
  margin: 0;
  color: #123e72;
  font-size: clamp(40px, 9vw, 70px);
  line-height: 1;
  letter-spacing: -0.055em;
}

.intro {
  margin: 24px auto 34px;
  color: #456481;
  font-size: clamp(16px, 3vw, 20px);
  line-height: 1.7;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.github-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid #185899;
  border-radius: 8px;
  background: linear-gradient(#55aaf1, #2773bd);
  box-shadow:
    inset 0 1px rgba(255, 255, 255, 0.55),
    0 8px 22px rgba(32, 102, 170, 0.22);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms ease, filter 160ms ease;
}

.github-button:hover {
  filter: brightness(1.06);
  transform: translateY(-2px);
}

.github-button:focus-visible {
  outline: 3px solid rgba(38, 116, 189, 0.35);
  outline-offset: 4px;
}

@media (max-width: 520px) {
  .hero {
    padding: 14px;
  }

  .window-controls {
    letter-spacing: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .github-button {
    transition: none;
  }
}