/* Beyond PPP — shared stylesheet
   Token system: institutional cobalt on paper, cut-corner "Aktenschnitt" motif,
   Public Sans (display/civic) + Source Sans 3 (body) + IBM Plex Mono (citations/figures). */

/* Self-hosted webfonts (replaces Google Fonts CDN — see Datenschutzerklärung) */
@font-face {
  font-family: 'Public Sans';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('fonts/public-sans-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Source Sans 3';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('fonts/source-sans-3-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('fonts/ibm-plex-mono-latin-500.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('fonts/ibm-plex-mono-latin-600.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  --paper: #ffffff;
  --paper-alt: #eef2f8;
  --paper-raised: #f7f9fc;
  --ink: #101820;
  --slate: #4d5b68;
  --slate-soft: #7c8894;
  --line: #ccd6e0;
  --line-soft: #e3e9ef;
  --brand: #0d254d;
  --brand-deep: #081733;
  --brand-ink: #ffffff;
  --accent: #0057b8;
  --accent-ink: #ffffff;
  --tint: #eef3f9;
  --focus-ring: #0057b8;
  --magenta: #ec008c;
  --magenta-deep: #c70069;
  --gray-bg: #eeeeee;

  --font-display: 'Public Sans', Arial, Helvetica, sans-serif;
  --font-body: 'Source Sans 3', Arial, Helvetica, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0a1420;
    --paper-alt: #101d2c;
    --paper-raised: #14233a;
    --ink: #e7edf3;
    --slate: #aab8c6;
    --slate-soft: #8391a0;
    --line: #26364a;
    --line-soft: #1c2a3c;
    --brand: #0d254d;
    --brand-deep: #081733;
    --brand-ink: #ffffff;
    --accent: #5aa9ff;
    --accent-ink: #06121f;
    --tint: #122036;
    --focus-ring: #5aa9ff;
    --magenta: #ff4fb2;
    --magenta-deep: #c70069;
    --gray-bg: #161d27;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --paper: #0a1420;
  --paper-alt: #101d2c;
  --paper-raised: #14233a;
  --ink: #e7edf3;
  --slate: #aab8c6;
  --slate-soft: #8391a0;
  --line: #26364a;
  --line-soft: #1c2a3c;
  --brand: #0d254d;
  --brand-deep: #081733;
  --brand-ink: #ffffff;
  --accent: #5aa9ff;
  --accent-ink: #06121f;
  --tint: #122036;
  --focus-ring: #5aa9ff;
  --magenta: #ff4fb2;
  --magenta-deep: #c70069;
  --gray-bg: #161d27;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding-inline: clamp(18px, 4vw, 40px);
}

img { max-width: 100%; }
[hidden] { display: none !important; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  margin: 0;
  text-wrap: balance;
  color: var(--ink);
}

p { margin: 0; }

a { color: inherit; text-decoration: none; }

:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.eyebrow.on-brand { color: #bcd3f2; }

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 40;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-block: 16px;
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.wordmark span { color: var(--accent); }

.main-nav {
  display: flex;
  gap: clamp(14px, 2.4vw, 30px);
  flex-wrap: wrap;
}

.main-nav a {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--slate);
  padding-block: 4px;
  border-bottom: 2px solid transparent;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--ink);
  border-color: var(--accent);
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--slate-soft);
  flex-shrink: 0;
}

.lang-switch a.is-active { color: var(--ink); }
.lang-switch .sep { color: var(--line); }

.header-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.94rem;
  padding: 12px 22px;
  border: 1px solid transparent;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.btn-primary {
  background: var(--magenta);
  color: #fff;
}
.btn-primary:hover { background: var(--magenta-deep); }

.btn-outline {
  background: transparent;
  border-color: currentColor;
}

.btn-on-brand {
  color: #fff;
  border-color: rgba(255,255,255,0.55);
}
.btn-on-brand.btn-primary { background: var(--magenta); color: #fff; border-color: var(--magenta); }
.btn-on-brand.btn-primary:hover { background: var(--magenta-deep); border-color: var(--magenta-deep); }
.btn-on-brand.btn-outline:hover { background: rgba(255,255,255,0.12); }

/* ---------- Order links (retailer buttons) ---------- */

.order-links { margin-top: 26px; }
.order-links .eyebrow { display: block; margin-bottom: 10px; }

.order-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.order-buttons .btn-outline.order-retailer {
  padding: 10px 18px;
  font-size: 0.88rem;
}

.retailer-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  font-family: var(--font-display);
  font-size: 0.62rem;
  font-weight: 800;
  line-height: 1;
  flex-shrink: 0;
}

/* ---------- Announcement banner (essay page) ---------- */

.announce {
  background: var(--paper-alt);
  border-bottom: 1px solid var(--line);
}
.announce .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 12px;
  flex-wrap: wrap;
}
.announce p {
  font-size: 0.88rem;
  color: var(--slate);
}
.announce strong { color: var(--ink); }

/* ---------- Hero ---------- */

.hero {
  background: linear-gradient(155deg, var(--brand) 0%, var(--brand-deep) 100%);
  color: #fff;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%, 0 calc(100% - 44px), 44px 100%, 0 100%);
  padding-block: clamp(48px, 8vw, 88px) clamp(80px, 10vw, 120px);
  position: relative;
}

.hero-grid {
  display: grid;
  gap: 28px;
  max-width: 760px;
}

.hero h1 {
  color: #fff;
  font-size: clamp(2rem, 4.4vw, 3.1rem);
  margin-top: 14px;
}

.hero .lede {
  font-size: 1.15rem;
  color: #dce6f4;
  max-width: 56ch;
  margin-top: 4px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 8px;
}

/* ---------- Page header (essays index) ---------- */

.page-head {
  padding-block: clamp(40px, 6vw, 64px) clamp(28px, 4vw, 40px);
}

.page-head h1 {
  font-size: clamp(1.9rem, 3.8vw, 2.6rem);
  margin-top: 12px;
}

.page-head .lede {
  font-size: 1.08rem;
  color: var(--slate);
  max-width: 62ch;
  margin-top: 14px;
}

/* ---------- Section scaffolding ---------- */

section { padding-block: clamp(48px, 7vw, 84px); }
section + section { border-top: 1px solid var(--line); }

.section-tint { background: var(--gray-bg); }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 34px;
  flex-wrap: wrap;
}

.section-head h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); }

/* ---------- Teile / part cards (real sequence: Teil I, III, IV) ---------- */

.parts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.part-card {
  background: var(--paper);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.part-card .part-no {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--magenta);
  font-weight: 600;
}

.part-card h3 { font-size: 1.2rem; }

.part-card p { color: var(--slate); font-size: 0.95rem; }

.part-card .part-chaps {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--slate-soft);
  padding-top: 10px;
  border-top: 1px solid var(--line-soft);
}

/* ---------- Book split ---------- */

.book-split {
  display: grid;
  grid-template-columns: minmax(200px, 300px) 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

@media (max-width: 720px) {
  .book-split { grid-template-columns: 1fr; }
}

.cover-slideshow {
  position: relative;
  width: 100%;
  aspect-ratio: 1354 / 1959;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--brand);
}

.cover-slideshow.small { width: 90px; max-width: 90px; flex-shrink: 0; }

.cover-slideshow .slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  animation: coverFade 9s ease-in-out infinite;
}

.cover-slideshow .slide-front { animation-delay: 0s; }
.cover-slideshow .slide-back { animation-delay: 4.5s; }

@keyframes coverFade {
  0% { opacity: 0; }
  6% { opacity: 1; }
  44% { opacity: 1; }
  50% { opacity: 0; }
  100% { opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .cover-slideshow .slide { animation: none; opacity: 0; }
  .cover-slideshow .slide-front { opacity: 1; }
}

.book-meta {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--slate);
  margin-top: 6px;
}

.book-copy { margin-top: 18px; display: grid; gap: 14px; max-width: 62ch; }
.book-copy p { color: var(--ink); font-size: 1.01rem; }

.book-copy .lead-line {
  font-weight: 600;
  font-size: 1.08rem;
}

/* ---------- Two-column: Autoren / Aktuell ---------- */

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 5vw, 64px);
}

@media (max-width: 760px) {
  .two-col { grid-template-columns: 1fr; }
}

.two-col h2 { margin-bottom: 22px; font-size: 1.3rem; }

.author-row {
  display: flex;
  gap: 16px;
  padding-block: 18px;
  border-top: 1px solid var(--line-soft);
}
.author-row:first-of-type { border-top: none; }

.authors-photo-wrap { margin-bottom: 8px; }

.authors-photo {
  display: block;
  width: 280px;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  padding: 4px;
  background: var(--paper);
}

.authors-photo.small {
  width: 170px;
}

.authors-photo-cap {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--slate-soft);
  margin-top: 8px;
}

.avatar-tile {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  background: var(--brand);
  color: #fff;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.95rem;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%, 0 calc(100% - 9px), 9px 100%, 0 100%);
}

.author-row h4 { font-size: 1rem; }
.author-row p { color: var(--slate); font-size: 0.92rem; margin-top: 4px; }

.article-row {
  display: block;
  padding-block: 16px;
  border-top: 1px solid var(--line-soft);
}
.article-row:first-of-type { border-top: none; }

.article-row .tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.article-row .tag.tag-upcoming { color: var(--slate-soft); }

.article-row h4 {
  font-size: 1.02rem;
  margin-top: 6px;
}

.article-row:hover h4 { color: var(--accent); }

.article-row p { color: var(--slate); font-size: 0.9rem; margin-top: 4px; }

.article-row.is-upcoming { cursor: default; opacity: 0.68; }
.article-row.is-upcoming:hover h4 { color: var(--ink); }

.essays-list { max-width: 720px; }

.essays-list-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
}

.essays-list-head h3 {
  font-size: 0.9rem;
  color: var(--slate);
  font-weight: 700;
}

.essays-list-head.is-second { margin-top: 18px; }

/* ---------- Footer ---------- */

.site-footer {
  background: var(--paper-alt);
  border-top: 1px solid var(--line);
}

.newsletter-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding-block: 30px;
  border-bottom: 1px solid var(--line);
}

.newsletter-row h3 { font-size: 1.1rem; max-width: 40ch; }

.newsletter-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  flex-shrink: 0;
}

.newsletter-status {
  flex-basis: 100%;
  margin: 8px 0 0;
  font-size: 0.82rem;
  color: var(--slate);
}
.newsletter-status.is-success { color: #1a7f37; }
.newsletter-status.is-error { color: #b3261e; }

.newsletter-form input {
  font-family: var(--font-body);
  font-size: 0.92rem;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-right: none;
  background: var(--paper);
  color: var(--ink);
  width: 230px;
  max-width: 50vw;
}

.newsletter-form button {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 12px 20px;
  background: var(--magenta);
  color: #fff;
  border: 1px solid var(--magenta);
  cursor: pointer;
}
.newsletter-form button:hover { background: var(--magenta-deep); border-color: var(--magenta-deep); }

.press-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-block: 14px;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--slate-soft);
}
.press-contact a { color: var(--slate); text-decoration: underline; }
.press-contact a:hover { color: var(--accent); }
.press-contact .sep { color: var(--line); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding-block: 20px;
  font-size: 0.84rem;
  color: var(--slate-soft);
}

.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a:hover { color: var(--ink); }

/* ---------- Essay page: article layout ---------- */

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

@media (max-width: 860px) {
  .article-layout { grid-template-columns: 1fr; }
}

.article-head { max-width: 68ch; }
.article-head h1 {
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  margin-top: 12px;
}

.article-meta {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--slate);
}
.article-meta .dot { color: var(--line); }

.chart-panel {
  margin-top: 30px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  padding: 24px clamp(18px, 3vw, 30px) 20px;
}

.chart-panel .chart-cap {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--slate-soft);
  letter-spacing: 0.04em;
  margin-top: 14px;
}

.cost-bars { display: grid; gap: 16px; }
.cost-bar-row { display: grid; grid-template-columns: 120px 1fr; gap: 14px; align-items: center; }
.cost-bar-row .label { font-size: 0.86rem; color: var(--slate); font-weight: 600; }
.cost-bar-track {
  height: 30px;
  background: var(--line-soft);
  position: relative;
  display: flex;
}
.cost-seg { height: 100%; }
.cost-seg.price { background: var(--accent); }
.cost-seg.delay { background: #7fa8d6; }
.cost-seg.quality { background: #b9cde7; }
.legend { display: flex; gap: 18px; margin-top: 16px; flex-wrap: wrap; }
.legend span {
  font-size: 0.78rem;
  color: var(--slate);
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.legend i { width: 11px; height: 11px; display: inline-block; }
.legend .sw-price { background: var(--accent); }
.legend .sw-delay { background: #7fa8d6; }
.legend .sw-quality { background: #b9cde7; }

.article-body { margin-top: 30px; max-width: 68ch; display: grid; gap: 20px; }
.article-body p { font-size: 1.04rem; }

.pull-quote {
  border-left: 3px solid var(--magenta);
  padding-left: 20px;
  margin-block: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1.4;
  color: var(--ink);
}

.breakdown-grid {
  margin-top: 38px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  max-width: 68ch;
}
@media (max-width: 560px) { .breakdown-grid { grid-template-columns: 1fr; } }

.breakdown-cell { background: var(--paper); padding: 20px; }
.breakdown-cell .eyebrow { font-size: 0.66rem; }
.breakdown-cell h4 { font-size: 0.98rem; margin-top: 8px; }
.breakdown-cell p { font-size: 0.9rem; color: var(--slate); margin-top: 8px; }

/* ---------- Sidebar ---------- */

.side-card {
  border: 1px solid var(--line);
  padding: 20px;
  margin-bottom: 22px;
}
.side-card h4 { font-size: 0.95rem; margin-top: 6px; }
.side-card p { font-size: 0.88rem; color: var(--slate); margin-top: 8px; }

.side-card.side-book { display: flex; gap: 14px; align-items: flex-start; }

.side-card.side-brand {
  background: linear-gradient(155deg, var(--brand), var(--brand-deep));
  color: #fff;
  border: none;
}
.side-card.side-brand h4 { color: #fff; }
.side-card.side-brand p { color: #cfe0f4; }
.side-card.side-brand form { margin-top: 14px; display: grid; gap: 8px; }
.side-card.side-brand input {
  font-family: var(--font-body);
  padding: 10px 12px;
  border: 1px solid rgba(255,255,255,0.4);
  background: rgba(255,255,255,0.08);
  color: #fff;
}
.side-card.side-brand input::placeholder { color: #bcd3f2; }

/* ---------- Topic tags ---------- */

.topics-hub { margin-top: 46px; }
.topics-hub h3 {
  font-size: 0.9rem;
  color: var(--slate);
  font-weight: 700;
  margin-bottom: 14px;
}
.tag-row { display: flex; flex-wrap: wrap; gap: 10px; }
.tag-chip {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 8px 14px;
  border: 1px solid var(--line);
  color: var(--slate);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}
.tag-chip:hover { border-color: var(--magenta); color: var(--magenta); }

@media (prefers-reduced-motion: no-preference) {
  .btn, .article-row h4, .tag-chip { transition: all 0.15s ease; }
}