:root {
  color-scheme: light;
  --panel: rgba(255, 255, 255, 0.86);
  --panel-border: rgba(20, 41, 64, 0.14);
  --headline: #16304b;
  --text: #2e4455;
  --muted: #5f7081;
  --accent: #0f6289;
  --accent-strong: #094e6e;
  --shadow: 0 24px 70px rgba(11, 33, 51, 0.18);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Arial Nova", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 20%, rgba(255, 255, 255, 0.38), transparent 24%),
    radial-gradient(circle at 85% 18%, rgba(255, 255, 255, 0.2), transparent 22%),
    linear-gradient(-45deg, #ff7a59, #ffd166, #3ecf8e, #49a5ff, #b56cff, #ff7a59);
  background-size: auto, auto, 400% 400%;
  animation: rainbow-shift 18s ease infinite;
}

.page-shell {
  min-height: 100vh;
  padding: 48px 20px 72px;
}

.hero,
.content-card {
  width: min(920px, 100%);
  margin: 0 auto;
}

.hero {
  margin-bottom: 24px;
}

.eyebrow a,
.intro a,
.content-card a {
  color: var(--accent-strong);
}

.eyebrow {
  display: inline-block;
  margin: 0 0 10px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.56);
  color: var(--accent-strong);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow a {
  text-decoration: none;
}

h1 {
  margin: 0;
  color: #ffffff;
  font-size: clamp(2.4rem, 6vw, 4.7rem);
  line-height: 0.98;
  text-shadow: 0 10px 30px rgba(17, 32, 44, 0.18);
}

.back-link-wrap {
  margin: 12px 0 0;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid rgba(255, 255, 255, 0.46);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.28);
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  backdrop-filter: blur(10px);
  transition: transform 180ms ease, background-color 180ms ease;
}

.intro,
.updated {
  max-width: 760px;
}

.intro {
  margin: 18px 0 10px;
  color: rgba(255, 255, 255, 0.94);
  font-size: 1.08rem;
  line-height: 1.7;
}

.updated {
  margin: 0;
  color: rgba(255, 255, 255, 0.82);
  font-weight: 600;
}

.content-card {
  padding: 28px;
  border: 1px solid var(--panel-border);
  border-radius: 28px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

section + section {
  margin-top: 28px;
}

h2 {
  margin: 0 0 12px;
  color: var(--headline);
  font-size: 1.15rem;
}

p,
li {
  font-size: 1rem;
  line-height: 1.75;
}

p {
  margin: 0;
}

p + p {
  margin-top: 12px;
}

ul {
  margin: 12px 0 0;
  padding-left: 20px;
}

li + li {
  margin-top: 8px;
}

@keyframes rainbow-shift {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

@media (max-width: 640px) {
  .page-shell {
    padding: 28px 14px 40px;
  }

  .content-card {
    padding: 20px;
    border-radius: 20px;
  }

  p,
  li {
    line-height: 1.65;
  }
}