:root {
  color-scheme: light;
  --ink: #102530;
  --muted: #526877;
  --line: rgba(24, 71, 75, .14);
  --teal: #147e77;
  --teal-dark: #0b3f41;
  --paper: rgba(255,255,255,.94);
  --soft: #f3faf8;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(246,250,249,.94), rgba(229,241,239,.88)),
    url("/data/local/rh-bg-pro.jpg?v=20260529c") center / cover fixed;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }

.rh-guide-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.rh-guide-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(7, 35, 42, .94);
  border-bottom: 1px solid rgba(255,255,255,.12);
  backdrop-filter: blur(16px);
}

.rh-guide-nav {
  width: min(1120px, calc(100% - 32px));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.rh-guide-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  font-weight: 950;
  font-size: 22px;
}

.rh-guide-brand img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

.rh-guide-navlinks {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.rh-guide-navlinks a {
  color: rgba(255,255,255,.78);
  font-weight: 850;
  font-size: 14px;
}

.rh-guide-hero {
  margin: 28px auto 18px;
  padding: clamp(26px, 5vw, 52px);
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(7, 35, 42, .96), rgba(12, 72, 68, .92));
  color: #fff;
  box-shadow: 0 24px 70px rgba(6, 24, 33, .2);
}

.rh-guide-kicker {
  display: inline-flex;
  margin-bottom: 12px;
  color: #9edbd3;
  font-size: 12px;
  font-weight: 950;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.rh-guide-hero h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(34px, 5vw, 58px);
  line-height: .98;
  letter-spacing: 0;
}

.rh-guide-hero p {
  max-width: 760px;
  margin: 18px 0 0;
  color: rgba(255,255,255,.78);
  font-size: 18px;
  line-height: 1.55;
}

.rh-guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 18px;
  align-items: start;
  margin-bottom: 28px;
}

.rh-guide-main,
.rh-guide-side,
.rh-guide-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 18px 54px rgba(15, 45, 55, .1);
}

.rh-guide-main {
  padding: clamp(22px, 4vw, 38px);
}

.rh-guide-main h2 {
  margin: 30px 0 10px;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.08;
}

.rh-guide-main h2:first-child { margin-top: 0; }
.rh-guide-main h3 { margin: 22px 0 8px; font-size: 19px; }
.rh-guide-main p,
.rh-guide-main li {
  color: var(--muted);
  line-height: 1.65;
}

.rh-guide-main ul,
.rh-guide-main ol {
  padding-left: 22px;
}

.rh-callout {
  margin: 20px 0;
  padding: 16px;
  border-radius: 8px;
  border: 1px solid rgba(20, 126, 119, .2);
  background: var(--soft);
}

.rh-warning {
  border-color: rgba(150, 98, 16, .2);
  background: #fff7df;
}

.rh-guide-side {
  position: sticky;
  top: 92px;
  padding: 18px;
}

.rh-guide-side h2 {
  margin: 0 0 12px;
  font-size: 18px;
}

.rh-guide-side nav {
  display: grid;
  gap: 9px;
}

.rh-guide-side a {
  padding: 10px 12px;
  border-radius: 8px;
  background: #fff;
  border: 1px solid var(--line);
  font-weight: 850;
}

.rh-guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.rh-guide-card {
  padding: 16px;
}

.rh-guide-card strong {
  display: block;
  margin-bottom: 6px;
  color: var(--teal-dark);
}

.rh-guide-footer {
  margin-top: 24px;
  padding: 22px 0 34px;
  color: #415765;
  font-size: 13px;
}

@media (max-width: 820px) {
  body { background-attachment: scroll; }
  .rh-guide-layout { grid-template-columns: 1fr; }
  .rh-guide-side { position: static; }
  .rh-guide-grid { grid-template-columns: 1fr; }
  .rh-guide-nav { align-items: flex-start; flex-direction: column; padding: 14px 0; }
}