:root{
  --seed-bg: #f7f2e7;
  --seed-fg: #322b22;
  --seed-primary: #1f6f5c;
  --seed-accent: #d97b2f;
  --seed-surface: #fffdf5;
  --seed-radius: 6px;
  --seed-spacing: 1;
  --seed-type: 1;
  --bg: var(--seed-bg);
  --fg: var(--seed-fg);
  --surface: var(--seed-surface);
  --muted: color-mix(in srgb, var(--seed-fg) 60%, var(--seed-bg));
  --border: color-mix(in srgb, var(--seed-fg) 24%, var(--seed-bg));
  --border-soft: color-mix(in srgb, var(--seed-fg) 13%, var(--seed-bg));
  --primary: var(--seed-primary);
  --accent: var(--seed-accent);
  --primary-soft: color-mix(in srgb, var(--seed-primary) 13%, var(--seed-surface));
  --accent-soft: color-mix(in srgb, var(--seed-accent) 20%, var(--seed-surface));
  --paper-line: color-mix(in srgb, var(--seed-fg) 7%, transparent);
  --shadow-ink: color-mix(in srgb, var(--seed-fg) 14%, transparent);
  --seed-note-yellow: #ecc94b;
  --seed-note-pink: #f0a3b8;
  --seed-note-blue: #8fc7de;
  --seed-note-green: #a8d5a2;
  --note-yellow: color-mix(in srgb, var(--seed-note-yellow) 26%, var(--seed-surface));
  --note-pink: color-mix(in srgb, var(--seed-note-pink) 24%, var(--seed-surface));
  --note-blue: color-mix(in srgb, var(--seed-note-blue) 26%, var(--seed-surface));
  --note-green: color-mix(in srgb, var(--seed-note-green) 26%, var(--seed-surface));
  --tape: color-mix(in srgb, var(--seed-accent) 16%, transparent);
  --on-primary: var(--seed-bg);
  --font-display: "Kaiti SC", "KaiTi", "STKaiti", "DFKai-SB", "BiauKai", serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Segoe UI", sans-serif;
  --r-card: calc(var(--seed-radius)*2.6) calc(var(--seed-radius)*0.7) calc(var(--seed-radius)*2.3) calc(var(--seed-radius)*0.9) / calc(var(--seed-radius)*0.7) calc(var(--seed-radius)*2.3) calc(var(--seed-radius)*0.9) calc(var(--seed-radius)*2.6);
  --r-chip: calc(var(--seed-radius)*1.2);
}
*{ box-sizing: border-box; margin: 0; padding: 0; }
html{ scroll-behavior: smooth; font-size: calc(16px * var(--seed-type)); }
body{
  font-family: var(--font-body);
  color: var(--fg);
  background-color: var(--bg);
  background-image: repeating-linear-gradient(0deg, transparent 0 31px, var(--paper-line) 31px 32px);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img, svg{ display: block; max-width: 100%; }
a{ color: var(--primary); }
ul{ list-style: none; }
.skip-link{
  position: absolute; left: -9999px; top: 0;
  background: var(--surface); color: var(--fg); padding: .5rem 1rem; z-index: 100;
}
.skip-link:focus{ left: 8px; top: 8px; }
.container{ max-width: 1080px; margin: 0 auto; padding: 0 1.25rem; }
.section{ padding: calc(3.6rem * var(--seed-spacing)) 0; scroll-margin-top: 84px; }
.section:first-of-type{ padding-top: calc(2.4rem * var(--seed-spacing)); }
.card{
  position: relative;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--r-card);
  box-shadow: 3px 4px 0 var(--shadow-ink);
}
.tape{ overflow: visible; }
.tape::before{
  content: ""; position: absolute; top: -11px; left: 50%;
  width: 86px; height: 22px;
  transform: translateX(-50%) rotate(-2.5deg);
  background: var(--tape);
  border-left: 1px dashed color-mix(in srgb, var(--seed-fg) 25%, transparent);
  border-right: 1px dashed color-mix(in srgb, var(--seed-fg) 25%, transparent);
}
.note{
  position: relative;
  border: 1.5px solid var(--border);
  border-radius: var(--r-card);
  box-shadow: 3px 4px 0 var(--shadow-ink);
  padding: 1.1rem 1.2rem;
}
.note-yellow{ background: var(--note-yellow); transform: rotate(-.6deg); }
.note-pink{ background: var(--note-pink); transform: rotate(.7deg); }
.note-blue{ background: var(--note-blue); transform: rotate(-.4deg); }
.note-green{ background: var(--note-green); transform: rotate(.5deg); }
.site-nav{
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--seed-bg) 92%, var(--seed-surface));
  border-bottom: 1.5px dashed var(--border);
}
.nav-inner{
  max-width: 1080px; margin: 0 auto; padding: .6rem 1.25rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.brand{
  display: flex; align-items: center; gap: .55rem;
  font-family: var(--font-display); font-size: 1.25rem; font-weight: 700;
  color: var(--fg); text-decoration: none; letter-spacing: .02em;
}
.brand svg{ width: 28px; height: 28px; color: var(--primary); flex: none; }
.nav-menu{ display: flex; gap: 1.1rem; flex-wrap: wrap; }
.nav-menu a{
  font-size: .92rem; color: var(--muted); text-decoration: none;
  padding: .2rem .1rem; border-bottom: 2px solid transparent;
}
.nav-menu a:hover{ color: var(--fg); border-bottom: 2px dashed var(--accent); }
.nav-menu a.active{ color: var(--primary); border-bottom: 2px solid var(--primary); font-weight: 600; }
.nav-toggle{
  display: none; background: none; border: 1.5px dashed var(--border);
  border-radius: var(--r-chip); color: var(--fg);
  width: 42px; height: 38px; cursor: pointer;
}
.nav-toggle svg{ width: 20px; height: 20px; margin: 0 auto; }
@media (max-width: 820px){
  .nav-toggle{ display: block; }
  .nav-menu{
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--surface); border-bottom: 1.5px dashed var(--border);
    padding: .8rem 1.25rem 1.1rem; flex-direction: column; gap: .55rem;
  }
  .nav-menu.open{ display: flex; }
  .nav-menu a{ font-size: 1.02rem; }
}
.hero{ padding: calc(3rem * var(--seed-spacing)) 0 calc(2.4rem * var(--seed-spacing)); position: relative; }
.hero-grid{ display: grid; grid-template-columns: 1.4fr .8fr; gap: 2.5rem; align-items: center; }
.eyebrow{
  display: inline-block; font-size: .85rem; color: var(--primary);
  border: 1.5px dashed var(--primary); border-radius: var(--r-chip);
  padding: .15rem .8rem; letter-spacing: .06em; background: var(--surface);
}
.hero h1{
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 5vw, 3.2rem);
  line-height: 1.15; letter-spacing: -0.01em;
  margin: 1rem 0 .9rem;
}
.hero h1 .hl{
  background: linear-gradient(transparent 62%, var(--accent-soft) 62%);
  padding: 0 .1em;
}
.hero .lede{ font-size: 1.05rem; color: var(--muted); max-width: 34em; }
.hero .lede strong{ color: var(--fg); }
.quick-nav{ display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 1.5rem; }
.quick-nav a{
  font-size: .9rem; text-decoration: none; color: var(--fg);
  background: var(--surface); border: 1.5px solid var(--border);
  border-radius: var(--r-chip); padding: .32rem .85rem;
  box-shadow: 2px 2px 0 var(--shadow-ink);
  transition: transform .15s ease, box-shadow .15s ease;
}
.quick-nav a:hover{ transform: translateY(-2px); box-shadow: 2px 4px 0 var(--shadow-ink); }
.hero-compass{ position: relative; }
.hero-compass svg{ width: 100%; height: auto; color: var(--fg); }
.hero-compass .compass-note{
  position: absolute; right: 4%; bottom: 2%;
  font-family: var(--font-display); font-size: .95rem; color: var(--muted);
  transform: rotate(-3deg);
}
@media (max-width: 820px){
  .hero-grid{ grid-template-columns: 1fr; gap: 1.6rem; }
  .hero-compass{ max-width: 280px; margin: 0 auto; }
}
.sec-head{ display: flex; align-items: baseline; gap: .9rem; margin-bottom: .6rem; flex-wrap: wrap; }
.sec-badge{
  font-family: var(--font-display); font-weight: 700; font-size: .95rem;
  color: var(--on-primary); background: var(--primary);
  border-radius: 50%; width: 2.5rem; height: 2.5rem; flex: none;
  display: inline-flex; align-items: center; justify-content: center;
  transform: rotate(-4deg); align-self: center;
}
.sec-head h2{
  font-family: var(--font-display); font-size: clamp(1.6rem, 3.2vw, 2.1rem);
  letter-spacing: -0.01em; line-height: 1.25;
}
.sec-head h2 .wavy{ text-decoration: underline wavy var(--accent); text-decoration-thickness: 2px; text-underline-offset: .35em; }
.sec-sub{ color: var(--muted); max-width: 46em; margin-bottom: 1.8rem; }
.sec-sub strong{ color: var(--fg); }
.grid-2{ display: grid; grid-template-columns: 1fr 1fr; gap: calc(1.4rem * var(--seed-spacing)); }
.grid-3{ display: grid; grid-template-columns: repeat(3, 1fr); gap: calc(1.4rem * var(--seed-spacing)); }
@media (max-width: 900px){ .grid-3{ grid-template-columns: 1fr; } }
@media (max-width: 760px){ .grid-2{ grid-template-columns: 1fr; } }
.key-points{ margin-top: .9rem; display: grid; gap: .42rem; }
.key-points li{
  position: relative; padding-left: 1.25rem;
  font-size: .9rem; color: var(--muted); line-height: 1.6;
}
.key-points li::before{
  content: "»"; position: absolute; left: 0; top: 0;
  color: var(--accent); font-weight: 700;
}
.key-points li strong{ color: var(--fg); }
.stage-list{ margin: 0; }
.stage-list li{ position: relative; padding: 0 0 1.4rem 2.6rem; }
.stage-list li::before{
  content: ""; position: absolute; left: 1rem; top: .4rem; bottom: -.3rem;
  border-left: 2px dashed var(--border);
}
.stage-list li:last-child::before{ display: none; }
.stage-num{
  position: absolute; left: 0; top: 0;
  width: 2.1rem; height: 2.1rem; border-radius: 50%;
  background: var(--surface); border: 2px solid var(--primary); color: var(--primary);
  font-family: var(--font-display); font-weight: 700;
  display: inline-flex; align-items: center; justify-content: center;
}
.stage-list h3{ font-family: var(--font-display); font-size: 1.15rem; }
.stage-list p{ font-size: .95rem; color: var(--muted); }
.diagram-card{ padding: 1.3rem 1.3rem 1.1rem; }
.diagram-card h3{
  font-family: var(--font-display); font-size: 1.25rem; margin-bottom: .2rem;
  display: flex; align-items: center; gap: .5rem;
}
.diagram-card h3 svg{ width: 21px; height: 21px; color: var(--primary); flex: none; }
.diagram-card .from{ font-size: .85rem; color: var(--muted); margin-bottom: .9rem; }
.diagram-card svg.diagram{ width: 100%; height: auto; margin: 0 auto; }
.diagram-cap{ font-size: .88rem; color: var(--muted); margin-top: .8rem; text-align: center; }
.formula-note{ display: flex; flex-direction: column; justify-content: center; gap: .5rem; }
.formula{
  font-family: var(--font-display); font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  font-weight: 700; text-align: center; letter-spacing: .02em;
}
.formula .op{ color: var(--accent); padding: 0 .15em; }
.formula-note .plain{ font-size: .95rem; color: var(--fg); }
.formula-note .plain strong{ color: var(--accent); }
.book-group-title{
  font-family: var(--font-display); font-size: 1.3rem; margin: 2.2rem 0 1.1rem;
  display: flex; align-items: center; gap: .6rem; flex-wrap: wrap;
}
.book-group-title:first-of-type{ margin-top: 0; }
.book-group-title svg{ width: 22px; height: 22px; color: var(--primary); }
.book-group-title .tagline{ font-size: .9rem; color: var(--muted); font-family: var(--font-body); font-weight: 400; }
.books{ display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(1.3rem * var(--seed-spacing)); }
@media (max-width: 760px){ .books{ grid-template-columns: 1fr; } }
.book{ display: flex; overflow: visible; transition: transform .18s ease; }
.book:hover{ transform: translateY(-3px) rotate(-.4deg); }
.book-spine{
  flex: none; width: 46px; display: flex; flex-direction: column;
  align-items: center; justify-content: space-between; padding: .9rem 0;
  background: var(--primary); color: var(--on-primary);
  border-radius: var(--r-card) 0 0 var(--r-card);
}
.book-spine .order{
  font-family: var(--font-display); font-weight: 700; font-size: 1.05rem;
  width: 1.7rem; height: 1.7rem; border: 1.5px dashed color-mix(in srgb, var(--seed-bg) 70%, transparent);
  border-radius: 50%; display: inline-flex; align-items: center; justify-content: center;
}
.book-spine .vtitle{
  writing-mode: vertical-rl; font-family: var(--font-display); font-size: .82rem; letter-spacing: .2em; opacity: .92;
}
.book-body{ padding: .95rem 1.1rem 1rem; flex: 1; }
.book-body h3{ font-family: var(--font-display); font-size: 1.12rem; line-height: 1.4; }
.book-body .author{ font-size: .85rem; color: var(--muted); margin: .1rem 0 .55rem; }
.book-body .review{ font-size: .93rem; }
.book-body .review::before{ content: "“"; color: var(--accent); font-family: var(--font-display); font-size: 1.2em; }
.book-body .review::after{ content: "”"; color: var(--accent); font-family: var(--font-display); font-size: 1.2em; }
.book-chip{
  display: inline-block; margin-top: .6rem; font-size: .78rem; color: var(--primary);
  border: 1px dashed var(--primary); border-radius: var(--r-chip); padding: .05rem .6rem;
  background: var(--primary-soft);
}
.loop-wrap{ padding: 1.3rem 1rem .8rem; }
.stage-cards{ margin-top: 1.6rem; }
.stage-card{ padding: 1.05rem 1.15rem; }
.stage-card h3{
  font-family: var(--font-display); font-size: 1.15rem; margin-bottom: .25rem;
  display: flex; align-items: center; gap: .5rem; flex-wrap: wrap;
}
.stage-card h3 .step-no{
  font-size: .8rem; color: var(--accent); font-family: var(--font-body);
  border: 1.5px dashed var(--accent); border-radius: var(--r-chip); padding: 0 .5rem;
}
.stage-card p{ font-size: .93rem; color: var(--muted); }
.stage-card p strong{ color: var(--fg); }
.tool-card{ padding: 1.3rem 1.3rem 1.2rem; }
.tool-card .tool-icon{
  width: 3rem; height: 3rem; border-radius: 50%;
  border: 2px dashed var(--primary); color: var(--primary);
  display: flex; align-items: center; justify-content: center; margin-bottom: .8rem;
  background: var(--primary-soft);
}
.tool-card .tool-icon svg{ width: 26px; height: 26px; }
.tool-card h3{ font-family: var(--font-display); font-size: 1.2rem; margin-bottom: .5rem; }
.tool-card p{ font-size: .93rem; color: var(--muted); margin-bottom: .8rem; }
.tool-chips{ display: flex; flex-wrap: wrap; gap: .5rem; }
.tool-chips span{
  font-size: .88rem; border: 1.5px solid var(--border); border-radius: var(--r-chip);
  background: var(--bg); padding: .18rem .75rem;
}
.cert-card{ padding: 1.3rem 1.4rem 1.2rem; display: flex; flex-direction: column; }
.cert-head{ display: flex; align-items: center; gap: .7rem; margin-bottom: .9rem; }
.cert-head svg{ width: 30px; height: 30px; color: var(--accent); flex: none; }
.cert-head h3{ font-family: var(--font-display); font-size: 1.28rem; }
.cert-head .abbr{ font-size: .8rem; color: var(--muted); display: block; letter-spacing: .04em; }
.cert-rows{ display: grid; gap: .55rem; }
.cert-row{ display: flex; gap: .7rem; font-size: .92rem; }
.cert-row .k{ flex: none; width: 4.2em; color: var(--primary); font-weight: 600; font-size: .88rem; }
.cert-row .v{ color: var(--muted); }
.cert-row .v strong{ color: var(--fg); }
.res-grid{ display: grid; grid-template-columns: repeat(3, 1fr); gap: calc(1.4rem * var(--seed-spacing)); margin-top: .4rem; }
@media (max-width: 900px){ .res-grid{ grid-template-columns: 1fr; } }
.res-card{ padding: 1.25rem 1.3rem 1.2rem; display: flex; flex-direction: column; gap: .5rem; text-decoration: none; color: var(--fg); transition: transform .16s ease; }
.res-card:hover{ transform: translateY(-3px); }
.res-card .res-tag{
  align-self: flex-start; font-size: .78rem; letter-spacing: .08em;
  border-radius: var(--r-chip); padding: .08rem .7rem;
  border: 1.5px solid var(--primary); color: var(--primary); background: var(--primary-soft);
}
.res-card .res-tag.video{ border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.res-card h3{ font-family: var(--font-display); font-size: 1.18rem; display: flex; align-items: center; gap: .5rem; }
.res-card h3 svg{ width: 20px; height: 20px; color: var(--accent); flex: none; }
.res-card p{ font-size: .93rem; color: var(--muted); flex: 1; }
.res-card .go{ font-size: .88rem; color: var(--primary); font-weight: 600; }
.res-card .go .arr{ color: var(--accent); }
.checklist-card{ padding: 1.5rem 1.6rem 1.4rem; }
.checklist-card h3{
  font-family: var(--font-display); font-size: 1.35rem; margin-bottom: 1rem;
  display: flex; align-items: center; gap: .55rem;
}
.checklist-card h3 svg{ width: 24px; height: 24px; color: var(--primary); }
.check-steps{ display: grid; gap: .75rem; }
.check-step{ display: flex; gap: .8rem; align-items: flex-start; }
.check-step .box{
  flex: none; width: 1.35rem; height: 1.35rem; margin-top: .22rem;
  border: 2px solid var(--primary); border-radius: calc(var(--seed-radius)*0.8);
  background: var(--surface); position: relative;
}
.check-step .box::after{
  content: ""; position: absolute; left: .28rem; top: .05rem;
  width: .55rem; height: .85rem; border-right: 2.5px solid var(--accent);
  border-bottom: 2.5px solid var(--accent); transform: rotate(40deg);
}
.check-step p{ font-size: .98rem; }
.check-step p strong{ color: var(--primary); }
.check-step p .why{ color: var(--muted); font-size: .88rem; }
.site-footer{
  border-top: 1.5px dashed var(--border); margin-top: 2rem;
  padding: 1.6rem 0 2.2rem; text-align: center;
}
.site-footer p{ font-size: .88rem; color: var(--muted); }
.sk-ink{ stroke: var(--fg); fill: none; }
.sk-soft{ stroke: var(--muted); fill: none; }
.sk-primary{ stroke: var(--primary); fill: none; }
.sk-accent{ stroke: var(--accent); fill: none; }
.sk-node{ fill: var(--surface); stroke: var(--primary); stroke-width: 2.2; }
.sk-node-a{ fill: var(--accent-soft); stroke: var(--accent); stroke-width: 2.2; }
.t-fg{ fill: var(--fg); }
.t-muted{ fill: var(--muted); }
.t-primary{ fill: var(--primary); }
.t-accent{ fill: var(--accent); }
.t-on-surface{ fill: var(--on-primary); }
.svg-h{ font-family: var(--font-display); font-weight: 700; }
.svg-b{ font-family: var(--font-body); }

/* ===== 多页展开版新增样式 ===== */
/* 图解区：默认展开，直接显示 */
.expanded-diagram{ margin-top: 1rem; border-top: 1.5px dashed var(--border); padding-top: 1rem; }
.expanded-diagram svg.diagram{ width: 100%; height: auto; margin: 0 auto; background: var(--bg); border-radius: var(--r-chip); }
/* 视频嵌入（16:9 自适应） */
.video-box{ position: relative; width: 100%; padding-bottom: 56.25%; background: var(--bg); border-radius: var(--r-chip); overflow: hidden; box-shadow: inset 0 0 0 1.5px var(--border); }
.video-box iframe{ position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video-wrap{ margin-top: 1.4rem; }
.video-wrap .video-title{
  font-family: var(--font-display); font-size: 1.15rem; margin-bottom: .5rem;
  display: flex; align-items: center; gap: .5rem;
}
.video-wrap .video-title svg{ width: 20px; height: 20px; color: var(--accent); flex: none; }
.video-cap{ font-size: .88rem; color: var(--muted); margin-top: .6rem; text-align: center; }
/* 页内导读条 */
.lead-strip{
  display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: calc(1rem * var(--seed-spacing)); margin: 1.6rem 0 .4rem;
}
.lead-item{ padding: .95rem 1.05rem; font-size: .92rem; color: var(--muted); }
.lead-item strong{ display: block; font-family: var(--font-display); font-size: 1.02rem; color: var(--fg); margin-bottom: .15rem; }
/* 对比表格 */
.cmp-table{ width: 100%; border-collapse: collapse; margin-top: .9rem; font-size: .92rem; }
.cmp-table th, .cmp-table td{ border: 1.5px solid var(--border); padding: .55rem .7rem; text-align: left; vertical-align: top; }
.cmp-table thead th{ background: var(--primary-soft); font-family: var(--font-display); font-size: .98rem; }
.cmp-table tbody tr:nth-child(even){ background: color-mix(in srgb, var(--seed-surface) 60%, var(--bg)); }
.cmp-table td:first-child{ color: var(--primary); font-weight: 600; white-space: nowrap; }
.cmp-table td strong{ color: var(--fg); }
/* 入口卡片（首页四大板块） */
.portal-grid{ display: grid; grid-template-columns: repeat(2, 1fr); gap: calc(1.5rem * var(--seed-spacing)); }
@media (max-width: 760px){ .portal-grid{ grid-template-columns: 1fr; } }
.portal-card{ display: flex; flex-direction: column; gap: .6rem; padding: 1.4rem 1.4rem 1.3rem; text-decoration: none; color: var(--fg); transition: transform .16s ease, box-shadow .16s ease; }
.portal-card:hover{ transform: translateY(-4px) rotate(-.5deg); box-shadow: 4px 7px 0 var(--shadow-ink); }
.portal-card .p-icon{
  width: 3.2rem; height: 3.2rem; border-radius: 50%;
  border: 2px dashed var(--accent); color: var(--accent);
  display: flex; align-items: center; justify-content: center; background: var(--accent-soft);
}
.portal-card .p-icon svg{ width: 28px; height: 28px; }
.portal-card h3{ font-family: var(--font-display); font-size: 1.45rem; }
.portal-card p{ font-size: .95rem; color: var(--muted); flex: 1; }
.portal-card .go{ font-size: .9rem; color: var(--primary); font-weight: 600; }
.portal-card .go .arr{ color: var(--accent); }
.portal-card .p-meta{ display: flex; flex-wrap: wrap; gap: .45rem; }
.portal-card .p-meta span{
  font-size: .78rem; border: 1px dashed var(--border); border-radius: var(--r-chip);
  padding: .04rem .6rem; color: var(--muted); background: var(--bg);
}
/* 页脚翻页 */
.pager{ display: flex; justify-content: space-between; gap: 1rem; margin-top: 2.4rem; flex-wrap: wrap; }
.pager a{
  text-decoration: none; font-size: .92rem; color: var(--fg);
  background: var(--surface); border: 1.5px solid var(--border); border-radius: var(--r-chip);
  padding: .5rem 1rem; box-shadow: 2px 2px 0 var(--shadow-ink); transition: transform .15s ease;
}
.pager a:hover{ transform: translateY(-2px); }
.pager a .d{ display: block; font-size: .78rem; color: var(--muted); }
.pager a .t{ font-weight: 600; }
.breadcrumb{ font-size: .85rem; color: var(--muted); margin-bottom: 1.2rem; }
.breadcrumb a{ text-decoration: none; }
.breadcrumb .sep{ color: var(--accent); padding: 0 .3em; }
/* 章节内小标题 */
.mini-h{
  font-family: var(--font-display); font-size: 1.18rem; margin: 2rem 0 .8rem;
  display: flex; align-items: center; gap: .5rem;
}
.mini-h svg{ width: 20px; height: 20px; color: var(--primary); flex: none; }
/* 补充说明卡片组 */
.tip-grid{ display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: calc(1.2rem * var(--seed-spacing)); margin-top: 1.4rem; }
/* 三级页：进入详解链接 */
.detail-link{
  display: inline-flex; align-items: center; gap: .35rem; margin-top: .8rem;
  font-size: .88rem; font-weight: 600; color: var(--primary); text-decoration: none;
  border: 1.5px dashed var(--primary); border-radius: var(--r-chip); padding: .2rem .8rem;
  background: var(--primary-soft); transition: transform .15s ease;
}
.detail-link:hover{ color: var(--fg); border-color: var(--accent); transform: translateY(-2px); }
.detail-link .arr{ color: var(--accent); }
/* 三级页正文 */
.article-body{ display: grid; gap: calc(1.6rem * var(--seed-spacing)); }
.block{ padding: 1.3rem 1.4rem; }
.block h3{
  font-family: var(--font-display); font-size: 1.3rem; margin-bottom: .6rem;
  display: flex; align-items: center; gap: .5rem;
}
.block h3 svg{ width: 22px; height: 22px; color: var(--primary); flex: none; }
.block h4{ font-family: var(--font-display); font-size: 1.08rem; margin: 1.1rem 0 .4rem; }
.block p, .block li{ font-size: .96rem; color: var(--muted); }
.block p strong, .block li strong{ color: var(--fg); }
.block ul.list{ margin: .5rem 0; display: grid; gap: .4rem; }
.block ul.list li{ position: relative; padding-left: 1.25rem; }
.block ul.list li::before{ content: "»"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
.quote{
  font-family: var(--font-display); font-size: 1.05rem; line-height: 1.8;
  color: var(--fg); border-left: 3px solid var(--accent); padding: .4rem 0 .4rem 1rem;
  background: color-mix(in srgb, var(--accent-soft) 35%, transparent); border-radius: 0 var(--r-chip) var(--r-chip) 0;
}
.quote .src{ display:block; font-family: var(--font-body); font-size: .8rem; color: var(--muted); margin-top: .3rem; }
.step-timeline{ display: grid; gap: 1rem; margin-top: .6rem; }
.step-item{ position: relative; padding: 0 0 0 2.4rem; }
.step-item::before{
  content: ""; position: absolute; left: .9rem; top: .5rem; bottom: -1rem;
  border-left: 2px dashed var(--border);
}
.step-item:last-child::before{ display: none; }
.step-item .no{
  position: absolute; left: 0; top: 0; width: 1.9rem; height: 1.9rem; border-radius: 50%;
  background: var(--surface); border: 2px solid var(--accent); color: var(--accent);
  font-family: var(--font-display); font-weight: 700; font-size: .95rem;
  display: inline-flex; align-items: center; justify-content: center;
}
.step-item h4{ margin: 0 0 .15rem; }
.step-item p{ font-size: .93rem; }
/* 三级页书卡头图 */
.book-cover{
  display: flex; align-items: center; gap: 1.4rem; padding: 1.3rem 1.4rem;
}
.book-cover .cv-spine{
  flex: none; width: 74px; height: 108px; border-radius: 8px 4px 4px 8px;
  background: linear-gradient(135deg, var(--primary) 0%, color-mix(in srgb, var(--primary) 70%, #000) 100%);
  color: var(--on-primary); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .4rem;
  box-shadow: 3px 3px 0 var(--shadow-ink); transform: rotate(-2deg);
}
.book-cover .cv-spine span{ font-family: var(--font-display); font-size: .82rem; letter-spacing: .14em; writing-mode: vertical-rl; }
.book-cover .cv-info h3{ font-family: var(--font-display); font-size: 1.5rem; margin-bottom: .15rem; }
.book-cover .cv-info .author{ font-size: .9rem; color: var(--muted); margin-bottom: .4rem; }
.book-cover .cv-info .tagline{ font-size: .92rem; }
@media (max-width: 560px){ .book-cover{ flex-direction: column; text-align: center; } }
/* 章节内容展开：章节地图 */
.chapter-map{ display: grid; gap: 1rem; margin-top: .4rem; }
.chapter-part{ padding: 1rem 1.1rem; background: var(--bg); border-radius: var(--r-chip); }
.chapter-part .part-title{
  font-family: var(--font-display); font-size: 1.08rem; margin-bottom: .5rem;
  display: flex; align-items: center; gap: .5rem; color: var(--fg);
}
.chapter-part .part-title svg{ width: 18px; height: 18px; color: var(--accent); flex: none; }
.chapter-part .part-title .tag{
  font-family: var(--font-body); font-size: .72rem; font-weight: 400;
  color: var(--primary); border: 1px dashed var(--primary); border-radius: var(--r-chip);
  padding: 0 .5rem; background: var(--primary-soft);
}
.chapter-part ul{ display: grid; gap: .45rem; }
.chapter-part ul li{ position: relative; padding-left: 1.2rem; font-size: .93rem; color: var(--muted); }
.chapter-part ul li::before{ content: "▸"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
.chapter-part ul li strong{ color: var(--fg); }
.chapter-part ul li.star::before{ content: "★"; color: var(--accent); }
/* 工具详情页：功能清单、上手步骤 */
.tool-hero-band{ display: flex; align-items: center; gap: 1.2rem; padding: 1.2rem 1.4rem; }
.tool-hero-band .th-icon{
  flex: none; width: 3.4rem; height: 3.4rem; border-radius: 50%;
  border: 2px dashed var(--accent); color: var(--accent);
  display: flex; align-items: center; justify-content: center; background: var(--accent-soft);
}
.tool-hero-band .th-icon svg{ width: 30px; height: 30px; }
.tool-hero-band h3{ font-family: var(--font-display); font-size: 1.4rem; }
.tool-hero-band .sub{ font-size: .92rem; color: var(--muted); }
@media (max-width: 560px){ .tool-hero-band{ flex-direction: column; text-align: center; } }