/* 风格 3 · 书目 Bibliography
   纸色底 + 墨色 + 朱印；书名页竖排题名；目录作十二卷；条目是界行分隔的书目行。
   字体：宋体正文 / 楷体注文 / Georgia 英文书名。形状：方。层次：文武双线。 */
html[data-style="songban"] {
  --paper: #f4ecd8;
  --paper-hi: #f8f2e2;
  --ink: #28231b;
  --ink-soft: #4a4234;
  --note: #5c5240;
  --rule: #d8cbae;
  --zhu: #b93426;
  --zhu-deep: #9c2b1f;
  --serif: "Source Han Serif CN VF", "Songti SC", "STSong", "SimSun", "Noto Serif CJK SC", serif;
  --kai: "LXGW WenKai", "Kaiti SC", "KaiTi", "STKaiti", serif;
  --latin: "EB Garamond Variable", Georgia, "Times New Roman", serif;
  --num: "EB Garamond Variable", Palatino, "Palatino Linotype", Georgia, serif;
  color-scheme: light;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.75;
}
html[data-style="songban"] body {
  background:
    radial-gradient(ellipse 120% 60% at 50% -10%, rgb(255 252 240 / .6), transparent 60%),
    var(--paper);
}
html[data-style="songban"] ::selection { background: var(--zhu); color: var(--paper-hi); }

.sb-page {
  max-width: 1120px; margin: clamp(16px, 4vh, 48px) auto 140px;
  background: var(--paper-hi);
  border: 1px solid var(--ink);
  outline: 3px double var(--ink); outline-offset: 5px;
  padding: clamp(20px, 4vw, 56px) clamp(18px, 4vw, 56px) 64px;
}

/* ---- 书名页 ---- */
.sb-cover {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: clamp(24px, 5vw, 72px);
  padding: clamp(16px, 3vh, 40px) 0 clamp(28px, 4vh, 48px);
  border-bottom: 4px double var(--ink);
}
.sb-cover-l { display: flex; flex-direction: column; justify-content: flex-end; gap: 18px; padding: 8px 0; }
.sb-cover-l .sb-en { margin-bottom: auto; padding-top: 8px; }
.sb-en { font-family: var(--latin); font-size: 12px; letter-spacing: .22em; color: var(--ink-soft); margin: 0; }
.sb-fan { font-size: 15px; letter-spacing: .12em; margin: 0; color: var(--ink); }
.sb-fan::before, .sb-fan::after { content: ""; display: block; height: 1px; background: var(--rule); margin: 10px 0; }
.sb-lede { font-family: var(--kai); font-size: 14px; color: var(--note); margin: 0; max-width: 52ch; }
.sb-nav { display: flex; gap: 20px; flex-wrap: wrap; margin-top: 6px; }
.sb-nav a { text-decoration: none; font-size: 14px; letter-spacing: .2em; color: var(--ink); padding-bottom: 3px; border-bottom: 1px solid transparent; }
.sb-nav a:hover { border-bottom-color: var(--zhu); color: var(--zhu); }

/* ---- 版式簽條：界行格子，當前版式著朱 ---- */
.sb-styles {
  display: flex; align-items: stretch; overflow-x: auto; scrollbar-width: none;
  border-bottom: 1px solid var(--ink);
}
.sb-styles::-webkit-scrollbar { display: none; }
.sb-styles-label {
  display: flex; align-items: center; flex: none; padding: 0 16px;
  font-family: var(--kai); font-size: 12px; letter-spacing: .3em; color: var(--note);
  border-right: 1px solid var(--rule);
}
.sb-sty {
  display: flex; align-items: center; gap: 8px; flex: none;
  padding: 9px 14px; border-right: 1px solid var(--rule);
  text-decoration: none; color: var(--ink-soft); font-size: 13px; letter-spacing: .08em;
  transition: background-color .18s ease, color .18s ease;
}
.sb-sty i {
  font-style: normal; font-family: var(--kai); font-size: 11px; line-height: 1.6;
  color: var(--zhu); border: 1px solid var(--rule); border-radius: 2px; padding: 0 5px;
}
.sb-sty:hover { background: rgb(185 52 38 / .07); color: var(--zhu-deep); }
.sb-sty[aria-current="page"] { background: var(--zhu); color: var(--paper-hi); }
.sb-sty[aria-current="page"] i { color: var(--paper-hi); border-color: rgb(244 236 216 / .6); }
@media (prefers-reduced-motion: reduce) { .sb-sty { transition: none; } }

.sb-cover-r { display: flex; align-items: flex-start; gap: 18px; }
.sb-vtitle {
  writing-mode: vertical-rl; text-orientation: upright;
  font-size: clamp(34px, 4.6vw, 54px); font-weight: 700; letter-spacing: .14em;
  margin: 0; line-height: 1.1;
}
.sb-seal {
  display: inline-grid; place-items: center;
  background: linear-gradient(160deg, var(--zhu), var(--zhu-deep));
  color: var(--paper-hi);
  border-radius: 3px;
  font-family: var(--kai); font-weight: 700;
  box-shadow: inset 0 0 0 2px rgb(244 236 216 / .55), 0 1px 3px rgb(40 35 27 / .3);
  transform: rotate(-3deg);
  user-select: none;
}
.sb-seal-big { width: 62px; height: 62px; font-size: 26px; line-height: 1; grid-template-rows: 1fr 1fr; margin-top: 10px; }
.sb-seal-sm { width: 30px; height: 30px; font-size: 15px; margin-right: 10px; }
.sb-tS, .sb-tA, .sb-tB { width: 26px; height: 26px; font-size: 14px; flex: 0 0 auto; }
.sb-tA { background: linear-gradient(160deg, #c0492f, #a03323); }
.sb-tB { background: none; color: var(--zhu); box-shadow: inset 0 0 0 1.5px var(--zhu); }

/* 钤印动效 */
.sb-cover .sb-seal, .sb-board .sb-seal { opacity: 0; }
.sb-cover .sb-seal.sb-stamp, .sb-board .sb-seal.sb-stamp {
  animation: sb-stamp-in .5s cubic-bezier(.3, 1.4, .5, 1) forwards;
}
@keyframes sb-stamp-in {
  0% { opacity: 0; transform: rotate(6deg) scale(1.8); }
  60% { opacity: 1; transform: rotate(-4deg) scale(.96); }
  100% { opacity: 1; transform: rotate(-3deg) scale(1); }
}

/* ---- 牌记（方案板） ---- */
.sb-board { margin-top: clamp(24px, 4vh, 44px); }
.sb-board-frame {
  border: 1px solid var(--ink); outline: 1px solid var(--ink); outline-offset: 3px;
  padding: 22px 26px; position: relative; background: var(--paper);
}
.sb-board h2 { font-size: 18px; margin: 0 0 10px; letter-spacing: .08em; display: flex; align-items: center; }
.sb-board-en { font-family: var(--latin); font-weight: 400; font-style: italic; font-size: 13px; color: var(--note); margin-left: 12px; letter-spacing: .04em; }
.sb-concept { margin: 0 0 14px; font-size: 15px; }
.sb-axes { margin: 0 0 12px; border-top: 1px solid var(--rule); }
.sb-axes div { display: flex; gap: 16px; padding: 5px 0; border-bottom: 1px solid var(--rule); font-size: 13.5px; }
.sb-axes dt { flex: 0 0 3.4em; color: var(--note); letter-spacing: .2em; }
.sb-axes dd { margin: 0; }
.sb-risk { font-family: var(--kai); color: var(--note); font-size: 13.5px; margin: 0; }

/* ---- 检字条 ---- */
.sb-catalog { margin-top: clamp(28px, 5vh, 52px); }
.sb-find {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: stretch;
  border-top: 3px double var(--ink); border-bottom: 3px double var(--ink); padding: 12px 0;
}
.sb-find label { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.sb-find label > span { color: var(--paper-hi); background: var(--ink); width: 26px; height: 26px; display: grid; place-items: center; font-size: 13px; }
.sb-find-q { flex: 1 1 300px; min-width: 0; }
#sb-q {
  flex: 1; border: 0; border-bottom: 1px solid var(--ink); background: transparent;
  font-family: var(--kai); font-size: 15px; color: var(--ink); padding: 4px 2px;
}
#sb-q::placeholder { color: var(--note); opacity: .7; }
#sb-q:focus { outline: none; border-bottom-color: var(--zhu); }
.sb-find select {
  border: 1px solid var(--ink); background: var(--paper-hi); color: var(--ink);
  font-family: var(--serif); font-size: 13px; padding: 4px 6px; border-radius: 0;
}
#sb-reset {
  border: 1px solid var(--ink); background: var(--ink); color: var(--paper-hi);
  font-family: var(--serif); font-size: 13px; padding: 4px 14px; letter-spacing: .3em; border-radius: 0;
}
#sb-reset:hover { background: var(--zhu); border-color: var(--zhu); }

/* ---- 目录页（十二卷） ---- */
.sb-mulu-h { font-size: 30px; letter-spacing: .5em; text-align: center; margin: 34px 0 8px; font-weight: 700; }
.sb-mulu-h::after { content: ""; display: block; width: 120px; margin: 14px auto 6px; border-top: 3px double var(--ink); }
.sb-mulu { list-style: none; margin: 0; padding: 0; }
.sb-mulu li button {
  width: 100%; display: grid; grid-template-columns: 64px minmax(120px, auto) minmax(0, 1fr) auto;
  gap: 18px; align-items: baseline; text-align: left;
  background: none; border: 0; padding: 13px 4px;
  border-bottom: 4px double var(--rule);
  transition: background-color .2s;
}
.sb-mulu li button:hover { background: rgb(185 52 38 / .06); border-bottom-color: var(--ink); }
.sb-mulu li button:hover .sb-dname { transform: translateX(4px); }
.sb-juan { font-family: var(--kai); color: var(--note); font-size: 13.5px; letter-spacing: .1em; }
.sb-dname { font-size: 21px; font-weight: 700; letter-spacing: .1em; transition: transform .2s; }
.sb-dblurb { font-family: var(--kai); color: var(--note); font-size: 13px; }
.sb-dcount { font-family: var(--num); color: var(--ink-soft); font-size: 13.5px; }

/* ---- 域页头 ---- */
.sb-dhead { display: flex; align-items: baseline; gap: 18px; flex-wrap: wrap; padding: 26px 0 6px; border-bottom: 3px double var(--ink); }
.sb-dhead h3 { margin: 0; font-size: 27px; letter-spacing: .14em; }
.sb-dhead p { margin: 0; font-family: var(--kai); color: var(--note); font-size: 13.5px; }
.sb-back { border: 1px solid var(--ink); background: none; font-family: var(--serif); font-size: 13px; padding: 4px 12px; border-radius: 0; letter-spacing: .1em; }
.sb-back:hover { background: var(--ink); color: var(--paper-hi); }

/* ---- 小节与书目行 ---- */
.sb-sec { margin-top: 26px; }
.sb-sec > header { display: flex; align-items: baseline; gap: 14px; border-bottom: 2px solid var(--ink); padding-bottom: 6px; flex-wrap: wrap; }
.sb-sec h4 { margin: 0; font-size: 18px; letter-spacing: .12em; }
.sb-sec h4::before { content: "§"; color: var(--zhu); margin-right: 8px; font-family: var(--latin); }
.sb-sec > header p { margin: 0; font-family: var(--kai); color: var(--note); font-size: 13px; flex: 1; }
.sb-count { font-size: 15px; color: var(--note); padding: 18px 0 0; font-family: var(--kai); }
.sb-count b { font-family: var(--num); font-size: 22px; color: var(--ink); }

.sb-rows { list-style: none; margin: 0; padding: 0; }
.sb-row { border-bottom: 1px solid var(--rule); }
.sb-row a {
  display: grid; grid-template-columns: 34px minmax(0, 1fr) 128px; gap: 14px; align-items: center;
  padding: 12px 4px; text-decoration: none;
  transition: background-color .2s;
}
.sb-row a:hover { background: rgb(185 52 38 / .05); }
.sb-row a:hover .sb-bname { transform: translateX(4px); }
.sb-row a:hover { border-bottom-color: var(--ink); }
.sb-bmain { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.sb-bname { font-family: var(--latin); font-style: italic; font-weight: 700; font-size: 15.5px; transition: transform .2s; display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; }
.sb-lang { font-family: var(--kai); font-style: normal; font-weight: 400; font-size: 11px; color: var(--zhu); border: 1px solid var(--zhu); padding: 0 4px; }
.sb-note { font-family: var(--kai); color: var(--note); font-size: 13.5px; line-height: 1.6; }
.sb-meta { font-family: var(--kai); color: var(--note); font-size: 11.5px; opacity: .85; }
.sb-thumb {
  width: 128px; aspect-ratio: 8/5; object-fit: cover;
  border: 1px solid var(--ink); padding: 2px; background: var(--paper-hi);
  filter: sepia(.35) contrast(.95);
}
.sb-noshot { display: grid; place-items: center; font-family: var(--serif); font-size: 34px; font-weight: 700; color: var(--paper-hi); background: var(--ink-soft); }
.sb-empty { text-align: center; padding: 60px 0; font-family: var(--kai); color: var(--note); }
.sb-empty button { margin-top: 14px; border: 1px solid var(--ink); background: none; font-family: var(--serif); padding: 6px 18px; border-radius: 0; }
.sb-empty button:hover { background: var(--ink); color: var(--paper-hi); }

/* ---- 丛书 / 用法 / 凡例 ---- */
.sb-suite, .sb-how, .sb-method { margin-top: clamp(36px, 6vh, 64px); }
.sb-suite h2, .sb-how h2, .sb-method h2 {
  font-size: 22px; letter-spacing: .4em; margin: 0 0 4px; text-align: center;
}
.sb-h2-side { font-size: 13px; letter-spacing: .2em; color: var(--note); margin-left: 14px; font-family: var(--kai); font-weight: 400; }
.sb-suite h2::after, .sb-how h2::after, .sb-method h2::after {
  content: ""; display: block; width: 90px; margin: 12px auto 18px; border-top: 3px double var(--ink);
}
.sb-suite-lede { text-align: center; font-family: var(--kai); color: var(--note); font-size: 14px; max-width: 62ch; margin: 0 auto 18px; }
.sb-skills { list-style: none; margin: 0; padding: 0; }
.sb-skills li { display: grid; grid-template-columns: 46px minmax(180px, auto) minmax(0, 1fr); gap: 14px; align-items: baseline; padding: 9px 4px; border-bottom: 1px solid var(--rule); }
.sb-skno { font-family: var(--kai); color: var(--zhu); font-size: 13.5px; }
.sb-skills code { font-family: var(--latin); font-size: 14px; font-weight: 700; letter-spacing: .02em; }
.sb-skills a { text-decoration: none; }
.sb-skills a:hover code { color: var(--zhu); }
.sb-skills p { margin: 0; font-family: var(--kai); color: var(--note); font-size: 13px; }

.sb-how-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(20px, 4vw, 48px); }
.sb-how h3 { font-size: 15px; letter-spacing: .3em; margin: 0 0 10px; text-align: center; }
.sb-how .sb-how-grid h3::after { content: ""; display: block; width: 40px; margin: 8px auto 0; border-top: 1px solid var(--rule); }
.sb-how pre {
  background: var(--ink); color: var(--paper-hi); padding: 16px 18px; margin: 0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 12px; line-height: 1.8;
  overflow-x: auto; border: 1px solid var(--ink); outline: 3px double var(--ink); outline-offset: 3px;
}
.sb-how ul { margin: 0; padding: 0; list-style: none; }
.sb-how li { font-family: var(--kai); color: var(--note); font-size: 13.5px; padding: 7px 0; border-bottom: 1px solid var(--rule); }

.sb-method-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 clamp(24px, 4vw, 56px); margin: 0; }
.sb-method-grid div { padding: 12px 4px; border-bottom: 4px double var(--rule); }
.sb-method-grid dt { font-weight: 700; letter-spacing: .15em; font-size: 14.5px; }
.sb-method-grid dd { margin: 4px 0 0; font-family: var(--kai); color: var(--note); font-size: 13px; }

.sb-foot {
  margin-top: clamp(36px, 6vh, 56px); padding-top: 14px; border-top: 3px double var(--ink);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-family: var(--kai); font-size: 12.5px; color: var(--note);
}
.sb-foot a { color: var(--zhu); }

/* ---- 展卷 + 墨色渐显 ---- */
.sb-rl { clip-path: inset(0 0 100% 0); }
.sb-roll.sb-open .sb-rl { clip-path: inset(0 0 0 0); transition: clip-path .9s cubic-bezier(.2, .7, .2, 1); }
.sb-view .sb-row, .sb-view .sb-mulu li, .sb-view .sb-sec, .sb-view .sb-dhead, .sb-view .sb-count, .sb-view .sb-mulu-h { opacity: 0; transform: translateY(8px); }
.sb-view.sb-dealt .sb-row, .sb-view.sb-dealt .sb-mulu li, .sb-view.sb-dealt .sb-sec, .sb-view.sb-dealt .sb-dhead, .sb-view.sb-dealt .sb-count, .sb-view.sb-dealt .sb-mulu-h {
  opacity: 1; transform: none; transition: opacity .5s ease, transform .5s ease;
}
.sb-view.sb-dealt .sb-mulu li:nth-child(1), .sb-view.sb-dealt .sb-row:nth-child(1) { transition-delay: 20ms; }
.sb-view.sb-dealt .sb-mulu li:nth-child(2), .sb-view.sb-dealt .sb-row:nth-child(2) { transition-delay: 55ms; }
.sb-view.sb-dealt .sb-mulu li:nth-child(3), .sb-view.sb-dealt .sb-row:nth-child(3) { transition-delay: 90ms; }
.sb-view.sb-dealt .sb-mulu li:nth-child(4), .sb-view.sb-dealt .sb-row:nth-child(4) { transition-delay: 125ms; }
.sb-view.sb-dealt .sb-mulu li:nth-child(5), .sb-view.sb-dealt .sb-row:nth-child(5) { transition-delay: 160ms; }
.sb-view.sb-dealt .sb-mulu li:nth-child(n+6), .sb-view.sb-dealt .sb-row:nth-child(n+6) { transition-delay: 195ms; }
.sb-view.sb-dealt .sb-row:nth-child(-n+12) .sb-seal { animation: sb-stamp-in .45s cubic-bezier(.3, 1.4, .5, 1) backwards; }
.sb-view.sb-dealt .sb-row:nth-child(2) .sb-seal { animation-delay: 70ms; }
.sb-view.sb-dealt .sb-row:nth-child(3) .sb-seal { animation-delay: 120ms; }
.sb-view.sb-dealt .sb-row:nth-child(n+4) .sb-seal { animation-delay: 170ms; }

@media (prefers-reduced-motion: reduce) {
  .sb-rl { clip-path: none; }
  .sb-cover .sb-seal, .sb-board .sb-seal { opacity: 1; }
  .sb-cover .sb-seal.sb-stamp, .sb-board .sb-seal.sb-stamp,
  .sb-view.sb-dealt .sb-row .sb-seal { animation: none; }
  .sb-view .sb-row, .sb-view .sb-mulu li, .sb-view .sb-sec, .sb-view .sb-dhead, .sb-view .sb-count, .sb-view .sb-mulu-h { opacity: 1; transform: none; }
  .sb-mulu li button, .sb-row a, .sb-bname { transition: none; }
}

/* ---- 响应式 ---- */
@media (max-width: 860px) {
  .sb-skills li { grid-template-columns: 40px minmax(0, 1fr); }
  .sb-skills p { grid-column: 2; }
  .sb-how-grid, .sb-method-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .sb-cover { grid-template-columns: 1fr; }
  .sb-cover-r { flex-direction: row-reverse; justify-content: space-between; }
  .sb-vtitle { writing-mode: horizontal-tb; font-size: 30px; letter-spacing: .08em; }
  .sb-mulu li button { grid-template-columns: 48px minmax(0, 1fr) auto; }
  .sb-dblurb { display: none; }
  .sb-row a { grid-template-columns: 30px minmax(0, 1fr); }
  .sb-thumb { display: none; }
}

/* 宽屏里版式入口换行排开，全部方向一眼可见（原先横向滚动且隐藏滚动条，后几个方向看不到）；窄屏仍横向滚动，顶部横条的下拉兜底。 */
@media (min-width: 721px) { .sb-styles { flex-wrap: wrap; overflow-x: visible; } }