:root {
  --bg: #0d1117;
  --panel: #151b23;
  --panel2: #1d2632;
  --text: #e6edf3;
  --muted: #a8b3c3;
  --accent: #7aa2f7;
  --accent2: #9ece6a;
  --border: #303b4c;
  --code: #0b0f14;
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.2);
}
:root[data-theme="light"] {
  --bg: #f3f6fb;
  --panel: #fff;
  --panel2: #edf2f8;
  --text: #18202b;
  --muted: #5d6b7d;
  --accent: #315fbd;
  --accent2: #397a31;
  --border: #d8dfeb;
  --code: #101722;
  --shadow: 0 12px 32px rgba(32, 52, 82, 0.09);
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    Inter,
    system-ui,
    -apple-system,
    "Segoe UI",
    sans-serif;
  line-height: 1.68;
}
.top {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.topin {
  max-width: 1280px;
  margin: auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  gap: 0.8rem;
  align-items: center;
}
.brand {
  font-weight: 850;
}
.spacer {
  flex: 1;
}
.btn,
button {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 0.55rem 0.8rem;
  border-radius: 0.7rem;
  text-decoration: none;
  cursor: pointer;
}
.layout {
  max-width: 1280px;
  margin: auto;
  padding: 1.4rem;
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr);
  gap: 1.4rem;
}
.toc {
  position: sticky;
  top: 76px;
  height: calc(100vh - 92px);
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem;
  box-shadow: var(--shadow);
}
.toc a {
  display: block;
  color: var(--muted);
  padding: 0.42rem 0.5rem;
  text-decoration: none;
  border-radius: 0.45rem;
}
.toc a:hover {
  background: var(--panel2);
  color: var(--text);
}
.chapter {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 1.1rem;
  padding: clamp(1.2rem, 3vw, 2.4rem);
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow);
}
.chapter-kicker {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 800;
  color: var(--accent);
  font-size: 0.78rem;
}
.chapter h1 {
  font-size: clamp(2.4rem, 7vw, 5rem);
  line-height: 1.02;
  margin: 0.35rem 0 1rem;
}
.chapter h2 {
  font-size: clamp(1.7rem, 4vw, 2.7rem);
  line-height: 1.12;
  margin: 0.35rem 0 1.2rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.75rem;
}
.chapter h3 {
  color: var(--accent);
  margin-top: 1.6rem;
}
.lead {
  font-size: 1.18rem;
  color: var(--muted);
  max-width: 900px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
  margin: 1.5rem 0;
}
.metric {
  max-width: 900px;
}
.metric {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  padding: 1rem;
}
.metric strong,
.metric span {
  display: block;
}
.metric span {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 0.25rem;
}
.callout {
  border-left: 4px solid var(--accent);
  background: var(--panel2);
  padding: 1rem 1.15rem;
  border-radius: 0.5rem;
  margin: 1.2rem 0;
}
pre {
  position: relative;
  background: var(--code);
  color: #d7e1ef;
  border: 1px solid #30363d;
  border-radius: 0.85rem;
  padding: 1.2rem;
  overflow-x: auto;
  white-space: pre;
}
pre code {
  font-family: "JetBrains Mono", "Cascadia Code", Consolas, monospace;
}
.copy {
  position: absolute;
  right: 0.5rem;
  top: 0.5rem;
  background: #202938;
  color: #e6edf3;
  border-color: #3b4658;
  font-size: 0.8rem;
}
code {
  font-family: "JetBrains Mono", "Cascadia Code", Consolas, monospace;
}
p code,
li code {
  background: var(--panel2);
  border: 1px solid var(--border);
  padding: 0.12rem 0.35rem;
  border-radius: 0.3rem;
}
table {
  border-collapse: collapse;
  width: 100%;
  display: block;
  overflow-x: auto;
}
th,
td {
  border: 1px solid var(--border);
  padding: 0.7rem;
  vertical-align: top;
}
th {
  background: var(--panel2);
}
img,
svg {
  max-width: 100%;
  height: auto;
}
.grid,
.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.grid > .card,
.cards > .card,
.grid > .box,
.cards > .box {
  width: 100%;
}
.card,
.box {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  padding: 1rem;
}
.workflow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.7rem;
  max-width: 900px;
}
.workflow > div {
  text-align: center;
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  padding: 0.8rem;
}
.muted {
  color: var(--muted);
}
footer {
  max-width: 1280px;
  margin: 0 auto 2rem;
  padding: 1rem 1.4rem;
  color: var(--muted);
}
@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }
  .toc {
    position: relative;
    top: auto;
    height: auto;
  }
  .hero-grid,
  .workflow {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 560px) {
  .hero-grid,
  .workflow {
    grid-template-columns: 1fr;
  }
  .layout {
    padding: 0.75rem;
  }
  .chapter {
    padding: 1rem;
  }
}
@media print {
  .top,
  .toc,
  .copy {
    display: none !important;
  }
  body {
    background: #fff;
    color: #111;
    font-size: 9.4pt;
  }
  .layout {
    display: block;
    max-width: none;
    padding: 0;
  }
  .chapter {
    border: 0;
    box-shadow: none;
    border-radius: 0;
    margin: 0;
    padding: 13mm 14mm;
    page-break-before: always;
  }
  .chapter:first-of-type {
    page-break-before: auto;
  }
  .chapter h1 {
    font-size: 30pt;
  }
  .chapter h2 {
    font-size: 20pt;
  }
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .workflow {
    grid-template-columns: 1fr;
  }
  pre {
    white-space: pre-wrap;
    overflow: visible;
    font-size: 7.8pt;
    background: #111827 !important;
    color: #f3f4f6 !important;
  }
  table {
    display: table;
    font-size: 8pt;
  }
  .btn {
    display: none;
  }
}

.book-toc {
  columns: 2;
  column-gap: 2rem;
  padding-left: 1.4rem;
}
.book-toc li {
  break-inside: avoid;
  margin: 0.45rem 0;
}
.book-toc a {
  color: var(--text);
  text-decoration: none;
}
.book-toc a:hover {
  color: var(--accent);
}
@media (max-width: 700px) {
  .book-toc {
    columns: 1;
  }
}
@media print {
  .book-toc {
    columns: 1;
  }
  .book-toc a:after {
    content: "";
  }
  .chapter-kicker {
    color: #315fbd !important;
  }
  .chapter h3 {
    break-after: avoid;
  }
  pre,
  table,
  img {
    break-inside: avoid;
  }
  a[href^="#"] {
    color: #111;
    text-decoration: none;
  }
}

/* Lehrbuchlayout: eine ruhige Hauptspalte; Mehrspalten nur in echten Tabellen. */
main {
  min-width: 0;
}
.chapter > .grid,
.chapter > .cards,
.section.grid,
.section .grid,
.section .cards {
  grid-template-columns: 1fr !important;
}
.chapter > .grid > .card,
.chapter > .cards > .card,
.section.grid > .card,
.section .grid > .card,
.section .cards > .card {
  max-width: none;
}
.hero-grid {
  grid-template-columns: 1fr !important;
  max-width: 900px;
}
.workflow,
.flow {
  grid-template-columns: 1fr !important;
  max-width: 900px;
}
.card,
.box {
  padding: 1.15rem 1.25rem;
}
@media print {
  .chapter > .grid,
  .chapter > .cards,
  .section.grid,
  .section .grid,
  .section .cards,
  .hero-grid,
  .workflow,
  .flow {
    grid-template-columns: 1fr !important;
  }
}

/* Kapitelsteuerung und einzeilige Navigation */
.toc strong {
  display: block;
  margin-bottom: 0.55rem;
}
.chapter-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45rem;
  margin: 0.15rem 0 0.8rem;
}
.chapter-controls button {
  min-width: 0;
  padding: 0.48rem 0.4rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 0.82rem;
}
.toc a {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}
.toc hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 0.8rem 0;
}
.chapter > h1,
.chapter > h2 {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.chapter > h1 .chapter-toggle,
.chapter > h2 .chapter-toggle {
  flex: 0 0 auto;
  margin-left: auto;
  padding: 0.25rem 0.5rem;
  line-height: 1;
  border-radius: 0.5rem;
  font-size: 1.05rem;
  background: var(--panel2);
}
.chapter > h1 .chapter-toggle:hover,
.chapter > h2 .chapter-toggle:hover {
  border-color: var(--accent);
}
.chapter-content[hidden] {
  display: none;
}
.chapter.is-collapsed {
  padding-bottom: 1.2rem;
}
.chapter.is-collapsed > h1,
.chapter.is-collapsed > h2 {
  margin-bottom: 0;
  border-bottom: 0;
  padding-bottom: 0;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
@media (max-width: 900px) {
  .toc {
    overflow-x: hidden;
  }
}
@media print {
  .chapter-controls,
  .chapter-toggle {
    display: none !important;
  }
  .chapter-content,
  .chapter-content[hidden] {
    display: block !important;
  }
}

/* JetBrains-Dark-artige, technologieübergreifend einheitliche Syntaxfarben */
pre {
  background: #0f141e !important;
  color: #d7dae0 !important;
  border-color: #2b3242 !important;
}
pre code {
  color: #d7dae0;
}
pre .kw,
pre .k,
pre .kc,
pre .kd,
pre .kn,
pre .kp,
pre .kr,
pre .kt {
  color: #ff7ab2;
  font-weight: 600;
}
pre .ty,
pre .nc,
pre .nn,
pre .nb,
pre .bp {
  color: #ffc66d;
}
pre .fn,
pre .nf,
pre .fm {
  color: #a9dc76;
}
pre .st,
pre .str,
pre .s,
pre .s1,
pre .s2,
pre .sa,
pre .sb,
pre .sc,
pre .sd,
pre .se,
pre .sh,
pre .si,
pre .sr,
pre .ss {
  color: #c3e88d;
}
pre .an,
pre .nd,
pre .na {
  color: #c792ea;
}
pre .cm,
pre .c,
pre .c1,
pre .ch,
pre .cs {
  color: #6a737d;
  font-style: italic;
}
pre .mi,
pre .mf,
pre .mh,
pre .mo,
pre .il {
  color: #f78c6c;
}
pre .o,
pre .ow {
  color: #89ddff;
}
pre .nt {
  color: #f07178;
}
pre .na {
  color: #ffcb6b;
}
pre .nv,
pre .n,
pre .nx {
  color: #d7dae0;
}
pre .prompt-key {
  color: #82aaff;
  font-weight: 700;
}
pre .prompt-file {
  color: #ffc66d;
}
.copy {
  background: #1b2432 !important;
  color: #f0f4fa !important;
  border-color: #3a465a !important;
}

/* Inhaltsverzeichnisse im Hauptbereich sind normaler Inhalt, keine fixe Navigation. */
main .content-index {
  position: static !important;
  top: auto !important;
  height: auto !important;
  overflow: visible !important;
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  padding: 1rem;
  box-shadow: none;
  margin: 1rem 0;
}
main .content-index a {
  display: block;
  color: var(--muted);
  padding: 0.35rem 0.45rem;
  text-decoration: none;
  border-radius: 0.4rem;
}
main .content-index a:hover {
  background: var(--accent-soft);
  color: var(--text);
}
main .content-index.grid {
  display: grid !important;
  grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
  gap: 1rem;
}
main section.content-index {
  max-width: none;
}

@media (max-width: 760px) {
  .theme-picker select {
    max-width: 140px;
  }
  main .content-index.grid {
    grid-template-columns: 1fr !important;
  }
}
@media print {
  .theme-picker {
    display: none !important;
  }
}

/* Kapitelnummern und kompakte Kapiteltypografie */
.chapter-kicker {
  display: inline-flex;
  align-items: center;
  min-height: 1.65rem;
  margin-bottom: 0.2rem;
  font-size: 0.74rem;
  line-height: 1;
  letter-spacing: 0.11em;
}
.chapter h1 {
  font-size: clamp(2rem, 4.2vw, 3.5rem);
  line-height: 1.08;
  max-width: 100%;
  overflow-wrap: anywhere;
}
.chapter h2 {
  font-size: clamp(1.55rem, 3vw, 2.25rem);
  line-height: 1.16;
  max-width: 100%;
  overflow-wrap: anywhere;
}
.chapter.is-collapsed {
  padding-top: 1rem;
  padding-bottom: 1rem;
  margin-bottom: 0.8rem;
}
.chapter.is-collapsed .chapter-kicker {
  margin-bottom: 0.1rem;
  font-size: 0.68rem;
}
.chapter.is-collapsed > h1,
.chapter.is-collapsed > h2 {
  font-size: clamp(1.22rem, 2vw, 1.65rem);
  line-height: 1.2;
  margin: 0.1rem 0 0;
  min-height: auto;
  align-items: center;
}
.chapter.is-collapsed > h1 .chapter-toggle,
.chapter.is-collapsed > h2 .chapter-toggle {
  font-size: 0.92rem;
  padding: 0.2rem 0.42rem;
}
@media (max-width: 700px) {
  .chapter h1 {
    font-size: clamp(1.85rem, 8vw, 2.55rem);
  }
  .chapter h2 {
    font-size: clamp(1.4rem, 6vw, 1.9rem);
  }
  .chapter.is-collapsed > h1,
  .chapter.is-collapsed > h2 {
    font-size: 1.15rem;
    line-height: 1.25;
  }
}
@media print {
  .chapter h1 {
    font-size: 27pt;
  }
  .chapter h2 {
    font-size: 18pt;
  }
}

/* Vollständige visuelle Themes: nicht nur Akzentfarben. */
:root[data-visual-theme="tokyo"] {
  --bg: #0d1117;
  --panel: #151b23;
  --panel2: #1d2632;
  --text: #e6edf3;
  --muted: #a8b3c3;
  --accent: #7aa2f7;
  --accent2: #9ece6a;
  --border: #303b4c;
  --code: #0f141e;
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.2);
  --accent-soft: rgba(122, 162, 247, 0.14);
  --syn-keyword: #ff7ab2;
  --syn-type: #ffc66d;
  --syn-function: #a9dc76;
  --syn-string: #c3e88d;
  --syn-annotation: #c792ea;
  --syn-comment: #6a737d;
  --syn-number: #f78c6c;
  --syn-operator: #89ddff;
  --syn-tag: #f07178;
  --syn-attr: #ffcb6b;
}
:root[data-theme="light"][data-visual-theme="tokyo"] {
  --bg: #f3f6fb;
  --panel: #ffffff;
  --panel2: #edf2f8;
  --text: #18202b;
  --muted: #5d6b7d;
  --accent: #315fbd;
  --accent2: #397a31;
  --border: #d8dfeb;
  --code: #111827;
  --shadow: 0 12px 32px rgba(32, 52, 82, 0.09);
  --accent-soft: rgba(49, 95, 189, 0.12);
}
:root[data-visual-theme="nord"] {
  --bg: #2e3440;
  --panel: #3b4252;
  --panel2: #434c5e;
  --text: #eceff4;
  --muted: #d8dee9;
  --accent: #88c0d0;
  --accent2: #a3be8c;
  --border: #4c566a;
  --code: #242933;
  --shadow: 0 14px 38px rgba(18, 22, 29, 0.28);
  --accent-soft: rgba(136, 192, 208, 0.16);
  --syn-keyword: #b48ead;
  --syn-type: #ebcb8b;
  --syn-function: #a3be8c;
  --syn-string: #a3be8c;
  --syn-annotation: #b48ead;
  --syn-comment: #7b88a1;
  --syn-number: #d08770;
  --syn-operator: #88c0d0;
  --syn-tag: #bf616a;
  --syn-attr: #ebcb8b;
}
:root[data-theme="light"][data-visual-theme="nord"] {
  --bg: #eceff4;
  --panel: #ffffff;
  --panel2: #e5e9f0;
  --text: #2e3440;
  --muted: #5d6778;
  --accent: #397f91;
  --accent2: #587a43;
  --border: #cbd2dc;
  --code: #2e3440;
  --shadow: 0 12px 30px rgba(46, 52, 64, 0.1);
  --accent-soft: rgba(57, 127, 145, 0.12);
}
:root[data-visual-theme="emerald"] {
  --bg: #071a17;
  --panel: #0d2621;
  --panel2: #12342d;
  --text: #e6fff7;
  --muted: #a5c9be;
  --accent: #34d399;
  --accent2: #6ee7b7;
  --border: #235246;
  --code: #061411;
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.28);
  --accent-soft: rgba(52, 211, 153, 0.15);
  --syn-keyword: #f472b6;
  --syn-type: #fbbf24;
  --syn-function: #6ee7b7;
  --syn-string: #a7f3d0;
  --syn-annotation: #c4b5fd;
  --syn-comment: #6b998c;
  --syn-number: #fb923c;
  --syn-operator: #67e8f9;
  --syn-tag: #fb7185;
  --syn-attr: #fde68a;
}
:root[data-theme="light"][data-visual-theme="emerald"] {
  --bg: #ecfdf5;
  --panel: #ffffff;
  --panel2: #dff7eb;
  --text: #12372f;
  --muted: #51756b;
  --accent: #047857;
  --accent2: #15803d;
  --border: #b7dfd1;
  --code: #062e26;
  --shadow: 0 12px 30px rgba(4, 120, 87, 0.09);
  --accent-soft: rgba(4, 120, 87, 0.12);
}
:root[data-visual-theme="dracula"] {
  --bg: #191a21;
  --panel: #282a36;
  --panel2: #343746;
  --text: #f8f8f2;
  --muted: #bdc0d4;
  --accent: #bd93f9;
  --accent2: #50fa7b;
  --border: #44475a;
  --code: #181920;
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.3);
  --accent-soft: rgba(189, 147, 249, 0.16);
  --syn-keyword: #ff79c6;
  --syn-type: #f1fa8c;
  --syn-function: #50fa7b;
  --syn-string: #f1fa8c;
  --syn-annotation: #bd93f9;
  --syn-comment: #6272a4;
  --syn-number: #ffb86c;
  --syn-operator: #8be9fd;
  --syn-tag: #ff5555;
  --syn-attr: #f1fa8c;
}
:root[data-theme="light"][data-visual-theme="dracula"] {
  --bg: #f6f2ff;
  --panel: #ffffff;
  --panel2: #eee7fb;
  --text: #2d2440;
  --muted: #6f6382;
  --accent: #7546b8;
  --accent2: #2f8d4e;
  --border: #d8caea;
  --code: #282a36;
  --shadow: 0 12px 30px rgba(117, 70, 184, 0.1);
  --accent-soft: rgba(117, 70, 184, 0.12);
}
:root[data-visual-theme="amber"] {
  --bg: #1b1510;
  --panel: #2a2119;
  --panel2: #382b20;
  --text: #fff7ed;
  --muted: #d4bca7;
  --accent: #f59e0b;
  --accent2: #fbbf24;
  --border: #5b4430;
  --code: #17110c;
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.3);
  --accent-soft: rgba(245, 158, 11, 0.16);
  --syn-keyword: #f472b6;
  --syn-type: #fbbf24;
  --syn-function: #a3e635;
  --syn-string: #bef264;
  --syn-annotation: #c4b5fd;
  --syn-comment: #917968;
  --syn-number: #fb923c;
  --syn-operator: #67e8f9;
  --syn-tag: #fb7185;
  --syn-attr: #fde68a;
}
:root[data-theme="light"][data-visual-theme="amber"] {
  --bg: #fff8eb;
  --panel: #ffffff;
  --panel2: #fff0cf;
  --text: #3a2717;
  --muted: #806b56;
  --accent: #b65f12;
  --accent2: #9a6700;
  --border: #ead5ad;
  --code: #2b1d12;
  --shadow: 0 12px 30px rgba(182, 95, 18, 0.1);
  --accent-soft: rgba(182, 95, 18, 0.12);
}
:root[data-visual-theme="rosepine"] {
  --bg: #191724;
  --panel: #1f1d2e;
  --panel2: #26233a;
  --text: #e0def4;
  --muted: #908caa;
  --accent: #ebbcba;
  --accent2: #c4a7e7;
  --border: #403d52;
  --code: #14121f;
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.3);
  --accent-soft: rgba(235, 188, 186, 0.15);
  --syn-keyword: #c4a7e7;
  --syn-type: #f6c177;
  --syn-function: #9ccfd8;
  --syn-string: #9ccfd8;
  --syn-annotation: #c4a7e7;
  --syn-comment: #6e6a86;
  --syn-number: #ebbcba;
  --syn-operator: #31748f;
  --syn-tag: #eb6f92;
  --syn-attr: #f6c177;
}
:root[data-theme="light"][data-visual-theme="rosepine"] {
  --bg: #faf4ed;
  --panel: #fffaf3;
  --panel2: #f2e9e1;
  --text: #575279;
  --muted: #797593;
  --accent: #b4637a;
  --accent2: #907aa9;
  --border: #dfdad9;
  --code: #26233a;
  --shadow: 0 12px 30px rgba(180, 99, 122, 0.09);
  --accent-soft: rgba(180, 99, 122, 0.12);
}

.theme-picker {
  display: inline-flex;
  align-items: center;
}
.theme-picker select {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 0.55rem 2.05rem 0.55rem 0.75rem;
  border-radius: 0.7rem;
  cursor: pointer;
  font: inherit;
  min-width: 145px;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--accent) 50%),
    linear-gradient(135deg, var(--accent) 50%, transparent 50%);
  background-position:
    calc(100% - 14px) 50%,
    calc(100% - 9px) 50%;
  background-size:
    5px 5px,
    5px 5px;
  background-repeat: no-repeat;
}
.theme-picker select:hover,
.theme-picker select:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* Syntaxfarben folgen ebenfalls dem gewählten Theme. */
pre .kw,
pre .k,
pre .kc,
pre .kd,
pre .kn,
pre .kp,
pre .kr,
pre .kt {
  color: var(--syn-keyword) !important;
}
pre .ty,
pre .nc,
pre .nn,
pre .nb,
pre .bp {
  color: var(--syn-type) !important;
}
pre .fn,
pre .nf,
pre .fm {
  color: var(--syn-function) !important;
}
pre .st,
pre .str,
pre .s,
pre .s1,
pre .s2,
pre .sa,
pre .sb,
pre .sc,
pre .sd,
pre .se,
pre .sh,
pre .si,
pre .sr,
pre .ss {
  color: var(--syn-string) !important;
}
pre .an,
pre .nd,
pre .na {
  color: var(--syn-annotation) !important;
}
pre .cm,
pre .c,
pre .c1,
pre .ch,
pre .cs {
  color: var(--syn-comment) !important;
}
pre .mi,
pre .mf,
pre .mh,
pre .mo,
pre .il {
  color: var(--syn-number) !important;
}
pre .o,
pre .ow {
  color: var(--syn-operator) !important;
}
pre .nt {
  color: var(--syn-tag) !important;
}
pre .na {
  color: var(--syn-attr) !important;
}
pre {
  background: var(--code) !important;
  border-color: var(--border) !important;
}
.copy {
  background: var(--panel2) !important;
  color: var(--text) !important;
  border-color: var(--border) !important;
}
@media (max-width: 760px) {
  .theme-picker select {
    max-width: 145px;
  }
}
@media print {
  .theme-picker {
    display: none !important;
  }
}

/* Kapitel 1 - fachliche Einführung */
.chapter-intro {
  max-width: 930px;
  margin: 1.2rem 0 1.5rem;
}
.chapter-intro p {
  margin: 0.65rem 0;
}
.role-stack {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  max-width: 950px;
}
.role-block {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  padding: 1rem 1.1rem;
}
.role-block h4 {
  margin: 0 0 0.35rem;
  color: var(--accent);
  font-size: 1.03rem;
}
.role-block p {
  margin: 0;
}
.principles-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.7rem;
  max-width: 950px;
  margin: 1rem 0;
}
.principles-list > div {
  display: grid;
  grid-template-columns: minmax(180px, 240px) 1fr;
  gap: 1rem;
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 0.7rem;
  padding: 0.8rem 1rem;
}
.principles-list span {
  color: var(--muted);
}
.quality-checklist li {
  margin: 0.38rem 0;
}
.source-note {
  margin-top: 1.5rem;
  padding: 0.8rem 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}
@media (max-width: 700px) {
  .principles-list > div {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
}
@media print {
  .chapter-intro,
  .role-stack,
  .principles-list {
    max-width: none;
  }
  .role-block,
  .principles-list > div {
    break-inside: avoid;
    background: #f4f7fb !important;
    border-color: #ccd5e2 !important;
  }
  .role-block h4 {
    color: #315fbd !important;
  }
  .source-note {
    font-size: 8pt;
    color: #555;
  }
}

/* Gemeinsame Navigation nach V1-Referenz */
.toc {
  position: sticky;
  top: 76px;
  height: calc(100vh - 92px);
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem;
  box-shadow: var(--shadow);
}
.toc strong {
  display: block;
  margin-bottom: 0.55rem;
}
.toc a {
  display: block;
  color: var(--muted);
  padding: 0.42rem 0.5rem;
  text-decoration: none;
  border-radius: 0.45rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}
.toc a:hover,
.toc a.active-book {
  background: var(--panel2);
  color: var(--text);
}
.chapter-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45rem;
  margin: 0.15rem 0 0.8rem;
}
.chapter-controls button {
  min-width: 0;
  padding: 0.48rem 0.4rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 0.82rem;
}
.shared-books {
  margin: -0.1rem 0 1rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--border);
}
.shared-books-title,
.nav-section-title {
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0.8rem 0.45rem 0.25rem;
}
.chapter-content[hidden] {
  display: none !important;
}
.chapter.is-collapsed {
  padding-bottom: 1.05rem;
}
.chapter.is-collapsed > h1,
.chapter.is-collapsed > h2 {
  margin-bottom: 0;
  border-bottom: 0;
  padding-bottom: 0;
}
@media (max-width: 900px) {
  .toc {
    position: relative;
    top: auto;
    height: auto;
    overflow-x: hidden;
  }
}
@media print {
  .toc,
  .chapter-controls,
  .chapter-toggle {
    display: none !important;
  }
  .chapter-content,
  .chapter-content[hidden] {
    display: block !important;
  }
}

/* Professioneller HTML-Feinschliff */
:root {
  --content-max: 920px;
  --nav-width: 292px;
  --radius-lg: 18px;
  --radius-md: 12px;
  --space-1: 0.4rem;
  --space-2: 0.7rem;
  --space-3: 1rem;
  --space-4: 1.4rem;
}
body {
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
.top,
.topbar,
body > header {
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--panel) 91%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
}
.top-inner,
.topin,
.header-inner {
  min-height: 62px;
  max-width: 1380px;
  margin: auto;
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.55rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.98rem;
  font-weight: 850;
  letter-spacing: 0.01em;
}
.brand::before {
  content: "";
  width: 0.72rem;
  height: 0.72rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 0 0 5px var(--accent-soft);
}
.layout {
  max-width: 1380px;
  grid-template-columns: var(--nav-width) minmax(0, 1fr);
  gap: 1.35rem;
  padding: 1.25rem;
}
main {
  min-width: 0;
  width: 100%;
}
main > .hero,
main > .chapter {
  max-width: var(--content-max);
  margin-left: auto;
  margin-right: auto;
}
.toc {
  border-radius: var(--radius-lg);
  padding: 0.9rem;
  box-shadow: 0 14px 34px color-mix(in srgb, var(--bg) 65%, transparent);
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.toc::-webkit-scrollbar {
  width: 8px;
}
.toc::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 999px;
}
.toc::-webkit-scrollbar-track {
  background: transparent;
}
.shared-books {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.45rem;
  background: color-mix(in srgb, var(--panel2) 70%, transparent);
}
.shared-books-title,
.nav-section-title {
  margin: 0.6rem 0.5rem 0.25rem;
  font-size: 0.69rem;
  letter-spacing: 0.1em;
}
.toc a {
  position: relative;
  padding: 0.44rem 0.55rem;
  border-radius: 0.55rem;
  font-size: 0.9rem;
}
.toc a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 0;
  border-radius: 999px;
  background: var(--accent);
  transform: translateY(-50%);
  transition: height 0.16s ease;
}
.toc a:hover::before,
.toc a.is-active::before {
  height: 58%;
}
.toc a.is-active {
  background: var(--accent-soft);
  color: var(--text);
  font-weight: 700;
}
.chapter-controls {
  position: sticky;
  top: -1rem;
  z-index: 2;
  grid-template-columns: 1fr 1fr;
  padding: 0.45rem 0 0.65rem;
  background: linear-gradient(var(--panel) 76%, transparent);
}
.chapter-controls button {
  font-size: 0.78rem;
  border-radius: 0.58rem;
}
.nav-search {
  margin: 0.25rem 0 0.7rem;
}
.nav-search input {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--panel2);
  color: var(--text);
  border-radius: 0.65rem;
  padding: 0.58rem 0.7rem;
  font: inherit;
}
.nav-search input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.nav-search-status {
  min-height: 1.1rem;
  padding: 0.25rem 0.15rem 0;
  color: var(--muted);
  font-size: 0.73rem;
}
.hero {
  border-radius: var(--radius-lg);
  padding: clamp(1.35rem, 3vw, 2.25rem);
  background:
    radial-gradient(circle at 90% 10%, var(--accent-soft), transparent 36%),
    var(--panel);
}
.hero h1 {
  max-width: 18ch;
  font-size: clamp(2rem, 4vw, 3.3rem);
  letter-spacing: -0.035em;
}
.hero p {
  max-width: 68ch;
  color: var(--muted);
  font-size: 1.03rem;
}
.chapter {
  border-radius: var(--radius-lg);
  transition:
    border-color 0.18s ease,
    box-shadow 0.18s ease,
    transform 0.18s ease;
}
.chapter:not(.is-collapsed) {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}
.chapter.is-collapsed {
  padding: 0.82rem 1rem;
  box-shadow: 0 8px 22px color-mix(in srgb, var(--bg) 74%, transparent);
}
.chapter.is-collapsed:hover {
  border-color: color-mix(in srgb, var(--accent) 48%, var(--border));
  transform: translateY(-1px);
}
.chapter > h1,
.chapter > h2 {
  line-height: 1.24;
  letter-spacing: -0.018em;
}
.chapter.is-collapsed > h1,
.chapter.is-collapsed > h2 {
  font-size: clamp(1.03rem, 1.65vw, 1.28rem) !important;
}
.chapter-toggle {
  width: 2.2rem;
  height: 2.2rem;
  display: grid;
  place-items: center;
  border-radius: 0.65rem !important;
  color: var(--accent);
}
.chapter-content {
  max-width: 78ch;
  margin: 0 auto;
}
.chapter-content > p {
  margin: 0.75rem 0;
}
.chapter-content > ul,
.chapter-content > ol {
  padding-left: 1.35rem;
}
.chapter-content li + li {
  margin-top: 0.28rem;
}
h3 {
  margin-top: 1.7rem;
  letter-spacing: -0.012em;
}
.callout,
.note,
.tip,
.warning {
  border-radius: 0.7rem;
  border-left-width: 4px;
}
pre {
  margin: 1rem 0 1.2rem;
  border-radius: 0.82rem;
  padding: 2.55rem 1rem 1rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}
pre::before {
  content: attr(data-language);
  position: absolute;
  left: 0.8rem;
  top: 0.62rem;
  color: var(--muted);
  font:
    700 0.7rem/1 system-ui,
    sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.09em;
}
.copy {
  top: 0.42rem;
  right: 0.45rem;
  font-size: 0.72rem;
}
.table-wrap {
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  margin: 1rem 0 1.2rem;
}
.table-wrap table {
  margin: 0;
  min-width: 680px;
}
.table-wrap th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--panel2);
}
.table-wrap tbody tr:nth-child(even) {
  background: color-mix(in srgb, var(--panel2) 55%, transparent);
}
.book-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  max-width: var(--content-max);
  margin: 0 auto;
}
.book-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.35rem;
  background: var(--panel);
  box-shadow: var(--shadow);
}
.book-card::after {
  content: "";
  position: absolute;
  right: -3rem;
  top: -3rem;
  width: 9rem;
  height: 9rem;
  border-radius: 50%;
  background: var(--accent-soft);
}
.book-card > * {
  position: relative;
  z-index: 1;
}
.book-card h2 {
  margin: 0.2rem 0 0.6rem;
}
.book-card .meta {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
  margin: 0.75rem 0 1rem;
}
.book-card .chip {
  padding: 0.28rem 0.5rem;
  border-radius: 999px;
  background: var(--panel2);
  color: var(--muted);
  font-size: 0.77rem;
}
.book-card .open-book {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 750;
}
.mobile-nav-toggle {
  display: none;
}
@media (max-width: 900px) {
  .top-inner,
  .topin,
  .header-inner {
    flex-wrap: wrap;
  }
  .mobile-nav-toggle {
    display: inline-flex;
  }
  .layout {
    display: block;
    padding: 0.8rem;
  }
  .toc {
    position: fixed;
    inset: 64px auto 0 0;
    z-index: 80;
    width: min(88vw, 330px);
    height: calc(100vh - 64px);
    border-radius: 0 18px 18px 0;
    transform: translateX(-105%);
    transition: transform 0.22s ease;
  }
  body.nav-open .toc {
    transform: translateX(0);
  }
  body.nav-open::after {
    content: "";
    position: fixed;
    inset: 64px 0 0;
    z-index: 70;
    background: rgba(0, 0, 0, 0.42);
  }
  .book-grid {
    grid-template-columns: 1fr;
  }
  main > .hero,
  main > .chapter {
    max-width: none;
  }
  .chapter {
    padding: 1.1rem;
  }
}
@media (max-width: 620px) {
  .theme-picker select {
    min-width: 108px;
    max-width: 120px;
  }
  .brand {
    font-size: 0.9rem;
  }
  .top-inner,
  .topin,
  .header-inner {
    gap: 0.4rem;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .chapter.is-collapsed {
    padding: 0.72rem 0.82rem;
  }
}

/* Startseite: fokussierte Bibliotheks- und Buchauswahl */
.library-page {
  min-height: 100vh;
  background:
    radial-gradient(circle at 82% 5%, var(--accent-soft), transparent 24rem),
    var(--bg);
}
.brand-link {
  color: var(--text);
  text-decoration: none;
}
.mode-toggle {
  width: 2.7rem;
  height: 2.7rem;
  display: grid;
  place-items: center;
  font-size: 1.2rem;
}
.library-main {
  max-width: 1480px;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 4.75rem) clamp(1.25rem, 3vw, 2.5rem) 3rem;
}
.library-page .top-inner {
  max-width: 1480px;
  padding-left: clamp(1.25rem, 3vw, 2.5rem);
  padding-right: clamp(1.25rem, 3vw, 2.5rem);
}
.library-page .library-footer {
  max-width: 1480px;
  padding-left: clamp(1.25rem, 3vw, 2.5rem);
  padding-right: clamp(1.25rem, 3vw, 2.5rem);
}
.library-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(320px, 0.5fr);
  align-items: end;
  gap: clamp(2rem, 6vw, 5rem);
  padding-bottom: clamp(3rem, 7vw, 6rem);
}
.eyebrow,
.book-kicker {
  margin: 0 0 0.8rem;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.library-hero h1 {
  max-width: 13ch;
  margin: 0;
  font-size: clamp(3rem, 7vw, 6rem);
  line-height: 0.98;
  letter-spacing: -0.06em;
}
.library-lead {
  max-width: 62ch;
  margin: 1.5rem 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}
.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
  font-weight: 800;
}
.btn-primary:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}
.text-link {
  color: var(--text);
  font-weight: 750;
  text-decoration: none;
}
.text-link:hover {
  color: var(--accent);
}
.library-overview {
  border-left: 1px solid var(--border);
  padding-left: clamp(1.5rem, 4vw, 3rem);
}
.library-overview > div {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.library-overview > div:last-child {
  border-bottom: 0;
}
.library-overview strong,
.library-overview span {
  display: block;
}
.library-overview strong {
  font-size: 1.35rem;
  letter-spacing: -0.025em;
}
.library-overview span {
  margin-top: 0.15rem;
  color: var(--muted);
  font-size: 0.88rem;
}
.library-section {
  scroll-margin-top: 5rem;
}
.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 1.5rem;
}
.section-heading h2 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}
.section-heading > p {
  max-width: 45ch;
  margin: 0;
  color: var(--muted);
}
.library-page .book-grid {
  max-width: none;
  gap: 1.25rem;
}
.library-page .book-card {
  display: flex;
  flex-direction: column;
  padding: clamp(1.35rem, 3vw, 2rem);
  box-shadow: 0 18px 50px color-mix(in srgb, var(--bg) 65%, transparent);
}
.library-page .book-card::after {
  width: 13rem;
  height: 13rem;
  right: -6rem;
  top: -7rem;
}
.library-page .featured-book {
  border-color: color-mix(in srgb, var(--accent) 65%, var(--border));
}
.book-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2.25rem;
}
.book-number {
  color: var(--muted);
  font:
    700 0.8rem/1 "JetBrains Mono",
    "Cascadia Code",
    monospace;
}
.book-badge {
  padding: 0.35rem 0.62rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
}
.book-badge.subtle {
  background: var(--panel2);
  color: var(--muted);
}
.library-page .book-card h3 {
  max-width: 18ch;
  margin: 0 0 0.8rem;
  color: var(--text);
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.12;
}
.library-page .book-card > p:not(.book-kicker) {
  margin: 0;
  color: var(--muted);
}
.book-features {
  margin: 1.4rem 0 1.6rem;
  padding: 0;
  list-style: none;
}
.book-features li {
  position: relative;
  padding: 0.42rem 0 0.42rem 1.55rem;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 65%, transparent);
}
.book-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 900;
}
.library-page .open-book {
  align-self: flex-start;
  margin-top: auto;
  padding: 0.72rem 1rem;
}
.library-note {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  margin-top: 1.25rem;
  padding: 1.15rem 1.3rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--panel) 72%, transparent);
}
.library-note p {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}
.note-icon {
  width: 2.4rem;
  height: 2.4rem;
  display: grid;
  place-items: center;
  border-radius: 0.7rem;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 900;
}
.library-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--border);
}
.library-footer a {
  color: var(--muted);
  text-decoration: none;
}
.library-footer a:hover {
  color: var(--accent);
}
@media (max-width: 800px) {
  .library-hero {
    grid-template-columns: 1fr;
    align-items: start;
  }
  .library-overview {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-left: 0;
    border-top: 1px solid var(--border);
    padding: 1rem 0 0;
    gap: 1rem;
  }
  .library-overview > div {
    border-bottom: 0;
  }
  .section-heading {
    display: block;
  }
  .section-heading > p {
    margin-top: 0.8rem;
  }
  .library-note {
    grid-template-columns: auto 1fr;
  }
  .library-note > a {
    grid-column: 2;
  }
}
@media (max-width: 540px) {
  .library-main {
    padding-top: 2.5rem;
  }
  .library-hero h1 {
    font-size: clamp(2.65rem, 14vw, 4rem);
  }
  .library-overview {
    grid-template-columns: 1fr;
  }
  .library-overview > div {
    padding: 0.4rem 0;
  }
  .book-card-top {
    margin-bottom: 1.5rem;
  }
  .library-note {
    grid-template-columns: 1fr;
  }
  .library-note > a {
    grid-column: auto;
  }
  .note-icon {
    display: none;
  }
  .library-footer {
    display: block;
  }
  .library-footer a {
    display: block;
    margin-top: 0.35rem;
  }
}