/* wpskg.com.cn 第1套 ROOT · 手册时间轴 */
:root {
  --paper: #f6f1e8;
  --paper-deep: #ebe3d4;
  --cream: #fffaf1;
  --spine: #1e3a6e;
  --spine-ink: #142847;
  --gold: #9a7a3e;
  --ink: #1c1914;
  --muted: #5c5348;
  --rule: #c9bba3;
  --rule-soft: #ddd2be;
  --ok: #2d5a3d;
  --danger: #7a2c2c;
  --shadow: rgba(30, 58, 110, 0.08);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  background: var(--paper-deep);
  color: var(--ink);
  font-family: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", "SimSun", "Times New Roman", serif;
  font-size: 17px;
  line-height: 1.88;
  text-rendering: optimizeLegibility;
}

img,
svg {
  max-width: 100%;
  vertical-align: middle;
}

a {
  color: var(--spine);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--spine-ink);
}

.book {
  width: min(1080px, 100%);
  margin: 0 auto;
  background: var(--paper);
  min-height: 100vh;
  box-shadow: 0 0 0 1px var(--rule), 18px 0 40px var(--shadow);
  position: relative;
}

.book::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 18px;
  background: linear-gradient(90deg, var(--spine-ink) 0%, var(--spine) 55%, #2a4d86 100%);
  box-shadow: inset -2px 0 0 rgba(255, 255, 255, 0.08);
}

.book-inner {
  padding-left: 18px;
}

/* —— header / nav —— */
.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--cream);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 2.2rem 0.85rem 2.6rem;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--spine);
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 1.15rem;
}

.brand:hover {
  color: var(--spine-ink);
}

.brand svg {
  flex-shrink: 0;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.site-nav a {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  text-decoration: none;
  color: var(--muted);
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 0.95rem;
}

.site-nav a:hover {
  color: var(--spine);
  border-color: var(--rule);
  background: var(--paper);
}

.site-nav a.active,
.site-nav a[aria-current="page"] {
  color: #fff;
  background: var(--spine);
  border-color: var(--spine);
}

/* —— hero —— */
.hero {
  position: relative;
  padding: 2.4rem 2.4rem 2rem 3.4rem;
  border-bottom: 1px dashed var(--rule);
  background:
    linear-gradient(180deg, rgba(30, 58, 110, 0.04), transparent 42%),
    var(--paper);
}

.hero-kicker,
.chapter-kicker {
  margin: 0 0 0.45rem;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--gold);
  text-transform: none;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.65rem, 3.2vw, 2.15rem);
  line-height: 1.45;
  color: var(--spine-ink);
  font-weight: 700;
}

.hero p,
.chapter p {
  margin: 0 0 0.95rem;
}

.hero-meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
  margin-top: 1.2rem;
}

/* —— timeline chapters —— */
.timeline {
  position: relative;
  padding: 0.4rem 2.2rem 2.4rem 3.4rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 1.55rem;
  top: 0.6rem;
  bottom: 1.2rem;
  width: 2px;
  background: var(--spine);
  opacity: 0.55;
}

.chapter {
  position: relative;
  padding: 1.7rem 0 0.4rem;
}

.chapter::before {
  content: "";
  position: absolute;
  left: -1.93rem;
  top: 2.15rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--spine);
  box-shadow: 0 0 0 4px var(--paper);
}

.chapter h2 {
  margin: 0 0 0.85rem;
  font-size: 1.28rem;
  line-height: 1.5;
  color: var(--spine-ink);
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--rule-soft);
}

.chapter h3 {
  margin: 1.15rem 0 0.55rem;
  font-size: 1.05rem;
  color: var(--spine);
  font-weight: 700;
}

.chapter-kicker {
  display: block;
}

/* —— buttons —— */
.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.62rem 1.25rem;
  background: var(--spine);
  color: #fff;
  text-decoration: none;
  border: 1px solid var(--spine-ink);
  border-radius: 2px;
  font-family: inherit;
  font-size: 0.98rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  box-shadow: 2px 2px 0 var(--gold);
}

.btn-download:hover {
  background: var(--spine-ink);
  color: #fff;
  box-shadow: 3px 3px 0 var(--gold);
}

.btn-download.is-loading,
.btn-download.is-loading:hover {
  opacity: 0.72;
  cursor: wait;
  box-shadow: none;
}

.btn-download svg {
  flex-shrink: 0;
}

.btn-note {
  color: var(--muted);
  font-size: 0.88rem;
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.4rem;
  background: var(--gold);
  color: #fff;
  text-decoration: none;
  border: 1px solid #7d622e;
  font-size: 1.02rem;
  box-shadow: 2px 2px 0 var(--spine);
}

.btn-cta:hover {
  background: #866832;
  color: #fff;
}

/* —— cards / reviews / callout —— */
.icon-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
  margin: 1.1rem 0 1.2rem;
}

.icon-card {
  background: var(--cream);
  border: 1px solid var(--rule-soft);
  padding: 0.9rem 1rem 1rem;
}

.icon-card svg {
  margin-bottom: 0.35rem;
  color: var(--spine);
}

.icon-card strong {
  display: block;
  margin: 0.2rem 0 0.35rem;
  color: var(--spine-ink);
}

.icon-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
}

.review {
  background: var(--cream);
  border-left: 4px solid var(--spine);
  padding: 0.95rem 1.1rem 0.35rem;
  margin: 0 0 1rem;
}

.review p {
  margin: 0 0 0.75rem;
}

.review footer {
  margin: 0 0 0.7rem;
  color: var(--gold);
  font-size: 0.9rem;
}

.callout {
  background: #eef1f6;
  border: 1px solid #c5cddc;
  padding: 0.95rem 1.1rem;
  margin: 1rem 0;
}

.callout p:last-child {
  margin-bottom: 0;
}

.cta-band {
  margin: 1.3rem 0 0.4rem;
  padding: 1.15rem 1.2rem;
  background: var(--cream);
  border: 1px solid var(--gold);
}

.cta-band h3 {
  margin-top: 0;
}

/* —— table —— */
.table-wrap {
  overflow-x: auto;
  margin: 1rem 0 1.15rem;
  border: 1px solid var(--rule);
  background: var(--cream);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

th,
td {
  padding: 0.65rem 0.8rem;
  border-bottom: 1px solid var(--rule-soft);
  text-align: left;
  vertical-align: top;
}

th {
  background: #e4ebf4;
  color: var(--spine-ink);
  font-weight: 700;
}

tr:last-child td {
  border-bottom: 0;
}

/* —— faq —— */
.faq-list {
  margin: 0.4rem 0 0;
}

.faq-list dt {
  margin: 1.05rem 0 0.35rem;
  font-weight: 700;
  color: var(--spine-ink);
}

.faq-list dt::before {
  content: "问 ";
  color: var(--gold);
  letter-spacing: 0.08em;
}

.faq-list dd {
  margin: 0 0 0.2rem;
  padding: 0.15rem 0 0.55rem 1.5rem;
  color: var(--ink);
  border-bottom: 1px dashed var(--rule-soft);
}

.faq-list dd::before {
  content: "答 ";
  color: var(--spine);
  margin-left: -1.5rem;
  letter-spacing: 0.08em;
}

/* —— steps —— */
.steps {
  margin: 0.6rem 0 1rem;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  position: relative;
  padding: 0.55rem 0 0.7rem 2.3rem;
  border-bottom: 1px dashed var(--rule-soft);
}

.steps li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.6rem;
  color: var(--spine);
  font-weight: 700;
  font-size: 0.86rem;
  letter-spacing: 0.04em;
}

/* —— footer —— */
.site-footer {
  border-top: 3px double var(--spine);
  background: var(--cream);
  padding: 1.4rem 2.4rem 1.8rem 2.8rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer p {
  margin: 0 0 0.55rem;
}

.foot-safe {
  color: var(--ok);
  font-weight: 700;
}

.site-footer nav {
  margin-top: 0.7rem;
}

.site-footer nav a {
  margin-right: 0.85rem;
  text-decoration: none;
}

.site-footer nav a:hover {
  text-decoration: underline;
}

/* —— responsive —— */
@media (max-width: 800px) {
  .book::before {
    width: 10px;
  }

  .book-inner {
    padding-left: 10px;
  }

  .header-inner,
  .hero,
  .timeline,
  .site-footer {
    padding-left: 1.15rem;
    padding-right: 1.15rem;
  }

  .timeline {
    padding-left: 1.85rem;
  }

  .timeline::before {
    left: 0.7rem;
  }

  .chapter::before {
    left: -1.22rem;
  }

  .icon-row {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 1.45rem;
  }

  .chapter h2 {
    font-size: 1.12rem;
  }
}

@media (max-width: 520px) {
  body {
    font-size: 16px;
  }

  .site-nav a {
    font-size: 0.88rem;
    padding: 0.3rem 0.55rem;
  }

  th,
  td {
    padding: 0.5rem 0.55rem;
    font-size: 0.88rem;
  }
}