.pm-book {
  --red: #d71920;
  --ink: #151d26;
  --muted: #707a88;
  --line: #e0e4e9;
  font: 16px/1.65 Arial, sans-serif;
  color: var(--ink);
  background: #fff;
}
.pm-book * { box-sizing: border-box; }
.pm-book .pb-wrap {
  max-width: 1320px;
  margin: auto;
  padding: 0 24px;
}
.pm-book .pb-nav {
  border-bottom: 1px solid var(--line);
  padding: 20px 0;
}
.pm-book .pb-nav-inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}
.pm-book .pb-nav strong {
  margin-right: 8px;
  font-size: 14px;
  letter-spacing: 1.5px;
  white-space: nowrap;
}
.pm-book .pb-nav a {
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: 30px;
  color: #5b6674;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}
.pm-book .pb-nav a:hover {
  color: var(--red);
  border-color: var(--red);
}
.pm-book .pb-section {
  padding: 64px 0;
  scroll-margin-top: 24px;
}
.pm-book .pb-soft { background: #f7f8fa; }
.pm-book .pb-heading {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 20px;
  margin-bottom: 36px;
}
.pm-book .pb-number {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 11px;
  background: var(--ink);
  color: #fff;
  font-size: 19px;
  font-weight: 700;
}
.pm-book h2 {
  margin: 0 0 14px;
  font-size: clamp(28px, 3vw, 38px);
  line-height: 1.25;
  font-weight: 700;
}
.pm-book h3 {
  margin: 0 0 6px;
  font-size: 23px;
  line-height: 1.35;
}
.pm-book p {
  margin: 0;
  color: var(--muted);
}
.pm-book .pb-heading p {
  max-width: 1050px;
  font-size: 17px;
}
.pm-book .pb-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}
.pm-book .pb-two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.pm-book .pb-card {
  padding: 30px;
  border: 1px solid var(--line);
  border-top: 4px solid var(--red);
  border-radius: 12px;
  background: #fff;
}
.pm-book .pb-tag {
  display: block;
  margin-bottom: 20px;
  color: var(--red);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.pm-book .pb-card h4 {
  margin: 22px 0 5px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .8px;
  text-transform: uppercase;
}
.pm-book .pb-card p { font-size: 15px; }
.pm-book ul {
  padding-left: 20px;
  margin: 18px 0 0;
  color: var(--muted);
}
.pm-book li { margin-bottom: 12px; }
.pm-book .pb-table {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}
.pm-book table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  font-size: 14px;
}
.pm-book th,
.pm-book td {
  padding: 16px 20px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}
.pm-book th {
  background: #fff3f3;
  color: var(--red);
  font-weight: 700;
}
.pm-book td { color: var(--muted); }
.pm-book td:first-child {
  color: var(--ink);
  font-weight: 600;
}
.pm-book tbody tr:last-child td { border-bottom: none; }
.pm-book .pb-note {
  margin-top: 18px;
  font-size: 13px;
}
.pm-book .pb-diagram {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}
.pm-book .pb-diagram svg {
  display: block;
  width: 100%;
  height: auto;
}
.pm-book .pb-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 18px;
  font-size: 13px;
  color: var(--muted);
}
.pm-book .pb-steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 18px;
  list-style: none;
  padding: 0;
  margin: 46px 0 0;
}
.pm-book .pb-step {
  position: relative;
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 36px 20px 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}
.pm-book .pb-step-number {
  position: absolute;
  top: -17px;
  left: 20px;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--red);
  color: #fff;
  font-weight: 700;
}
.pm-book .pb-step h3 {
  margin-bottom: 12px;
  font-size: 18px;
}
.pm-book .pb-step p {
  margin-bottom: 20px;
  font-size: 14px;
}
.pm-book .pb-time {
  margin-top: auto;
  color: var(--red);
  font-size: 14px;
  font-weight: 700;
}
.pm-book details { border-bottom: 1px solid var(--line); }
.pm-book summary {
  position: relative;
  padding: 22px 35px 22px 0;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 700;
}
.pm-book summary::-webkit-details-marker { display: none; }
.pm-book summary::after {
  content: "+";
  position: absolute;
  right: 5px;
  color: var(--red);
  font-size: 24px;
}
.pm-book details[open] summary { color: var(--red); }
.pm-book details[open] summary::after { content: "−"; }
.pm-book details p {
  padding-bottom: 24px;
  max-width: 1100px;
}
.pm-book a:focus-visible,
.pm-book summary:focus-visible,
.pm-book [tabindex]:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 4px;
}
@media (max-width: 1050px) {
  .pm-book .pb-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .pm-book .pb-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 34px 18px;
  }
}
@media (max-width: 680px) {
  .pm-book .pb-wrap { padding: 0 20px; }
  .pm-book .pb-section { padding: 44px 0; }
  .pm-book .pb-heading {
    grid-template-columns: 40px 1fr;
    gap: 14px;
  }
  .pm-book .pb-number {
    width: 40px;
    height: 40px;
    font-size: 16px;
  }
  .pm-book .pb-heading p { font-size: 15px; }
  .pm-book .pb-grid,
  .pm-book .pb-two,
  .pm-book .pb-steps {
    grid-template-columns: 1fr;
  }
  .pm-book .pb-card { padding: 24px; }
  .pm-book .pb-nav a { font-size: 12px; }
}