:root {
  --steel: #1e3a5f;
  --ice: #e8eef5;
  --amber: #d97706;
  --ink: #122033;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: #f3f6fa;
  color: var(--ink);
  font: 16px/1.68 "Cambria", "Source Han Serif SC", "SimSun", serif;
}
.topbar {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: end;
  padding: 12px 4vw 0;
  border-bottom: 4px solid var(--steel);
  background: #fff;
}
.topbar .id {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--steel);
  font-weight: 700;
  padding-bottom: 10px;
}
.topbar nav { justify-self: end; }
.topbar nav a {
  display: inline-block;
  padding: 8px 14px 10px;
  text-decoration: none;
  color: var(--steel);
}
.topbar nav a.is-current { background: var(--steel); color: #fff; }
.magazine {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 20px;
  padding: 28px 4vw 48px;
}
.hero-grid { grid-column: 1 / -1; display: grid; grid-template-columns: 7fr 5fr; gap: 20px; background: var(--steel); color: #e8eef5; padding: 28px; }
.hero-grid h1 { margin: 0 0 12px; font-size: 32px; }
.step-rail { background: #fff; padding: 16px; border-top: 6px solid var(--amber); }
.step-rail ol { margin: 0; padding-left: 20px; }
.step-rail a { color: #fff; background: var(--amber); text-decoration: none; display: inline-block; padding: 8px 10px; margin: 4px 4px 0 0; font-size: 14px; }
.span8 { grid-column: span 8; }
.span4 { grid-column: span 4; }
.span6 { grid-column: span 6; }
.span12 { grid-column: 1 / -1; }
.tile {
  background: #fff;
  padding: 16px 18px;
  border: 1px solid #c5d0de;
}
.tile h2 { margin-top: 0; font-size: 20px; color: var(--steel); }
.num {
  display: inline-block;
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  background: var(--amber);
  color: #fff;
  font-weight: 700;
  margin-right: 6px;
}
table.grid { width: 100%; border-collapse: collapse; font-size: 15px; }
table.grid th, table.grid td { border: 1px solid #c5d0de; padding: 6px 8px; }
table.grid th { background: var(--ice); }
.caution { grid-column: 1 / -1; background: #fff7ed; border: 2px solid var(--amber); padding: 14px 16px; }
.base {
  grid-column: 1 / -1;
  background: var(--steel);
  color: #d5deea;
  padding: 20px 4vw 28px;
  font-size: 13px;
}
.base p { margin: 0 0 8px; }
.tiny { font-size: 13px; color: #d6e2f0; }

@media (max-width: 900px) {
  .hero-grid, .magazine { grid-template-columns: 1fr; }
  .span8, .span4, .span6, .span12, .hero-grid { grid-column: auto; }
  .topbar { grid-template-columns: 1fr; }
}