:root {
  --navy: #1e3a8a;
  --blue: #2563eb;
  --bg: #eef2f7;
  --text: #1f2937;
  --muted: #6b7280;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.75;
}

.sheet {
  max-width: 430px;
  margin: 0 auto;
  background: #fff;
  min-height: 100vh;
}

.sheet.pc {
  max-width: 860px;
}

.top {
  background: var(--navy);
  color: #fff;
  padding: 22px 20px 20px;
}

.top a {
  color: #dbeafe;
  font-size: 13px;
  text-decoration: none;
}

.kicker {
  margin: 10px 0 0;
  font-size: 13px;
  color: #bfdbfe;
}

h1 {
  margin: 4px 0 0;
  font-size: 26px;
  line-height: 1.35;
}

.lead,
.block {
  padding: 18px 20px 0;
}

h2 {
  margin: 28px 0 8px;
  font-size: 20px;
  line-height: 1.4;
}

h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

p { margin: 0 0 10px; }

ol.steps {
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  counter-reset: step;
}

ol.steps > li {
  position: relative;
  margin: 0 0 22px;
  padding: 0 0 0 38px;
}

ol.steps > li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 1px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
}

ol.plain {
  margin: 8px 0 12px;
  padding-left: 1.2em;
}

.note,
.fields {
  margin: 12px 0;
  padding: 12px 14px;
  border-radius: 12px;
  font-size: 14px;
}

.note {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
}

.fields {
  background: #f9fafb;
  border: 1px solid #e5e7eb;
}

.fields dt {
  margin-top: 8px;
  font-weight: 700;
}

.fields dt:first-child { margin-top: 0; }

.fields dd {
  margin: 0;
  color: #374151;
}

ul {
  margin: 8px 0 12px;
  padding-left: 1.2em;
}

footer {
  padding: 8px 20px 36px;
  color: var(--muted);
  font-size: 12px;
}

a.url {
  word-break: break-all;
}

.mock {
  margin: 12px 0 4px;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  overflow: hidden;
  background: #f8fafc;
}

.mock-bar {
  background: #1d4ed8;
  color: #fff;
  padding: 10px 12px;
  font-size: 13px;
  font-weight: 700;
}

.mock-body { padding: 12px; }

.mock-label {
  margin: 8px 0 4px;
  font-size: 12px;
  font-weight: 700;
}

.mock-input {
  background: #fff;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  padding: 8px 10px;
  color: #6b7280;
  font-size: 14px;
}

.mock-button {
  margin-top: 12px;
  background: #2563eb;
  color: #fff;
  text-align: center;
  border-radius: 8px;
  padding: 8px;
  font-weight: 700;
  font-size: 14px;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin: 8px 0 0;
}

.tabs span {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 6px 4px;
  text-align: center;
  font-size: 11px;
  line-height: 1.3;
  color: #1e3a8a;
  font-weight: 700;
}

.toc {
  margin: 16px 20px 4px;
  padding: 14px 16px 10px;
  background: #f8fafc;
  border: 1px solid #dbe3ee;
  border-radius: 14px;
}

.toc-title {
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 700;
  color: var(--navy);
}

.toc ol {
  margin: 0;
  padding-left: 1.25em;
}

.toc li {
  margin: 3px 0;
}

.toc a {
  color: var(--blue);
  text-decoration: none;
}

.toc a:hover,
.toc a:focus {
  text-decoration: underline;
}

h2,
h3 {
  scroll-margin-top: 16px;
}

.shot {
  margin: 12px 0 8px;
}

.shot img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  background: #f8fafc;
}

.shot figcaption {
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
}

.jump {
  margin: 0 0 8px;
  font-size: 13px;
}

.jump a {
  color: var(--blue);
}