/* ── Self-hosted Fonts (keine Google-Fonts-Requests) ── */
  @font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 400 500;
    font-display: swap;
    src: url("/fonts/inter-latin-ext.woff2") format('woff2');
    unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
  }
  @font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 400 500;
    font-display: swap;
    src: url("/fonts/inter-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: 'JetBrains Mono';
    font-style: normal;
    font-weight: 400 500;
    font-display: swap;
    src: url("/fonts/jetbrains-mono-latin-ext.woff2") format('woff2');
    unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
  }
  @font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-weight: 400 500;
    font-display: swap;
    src: url("/fonts/jetbrains-mono-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: 'Space Grotesk';
    font-style: normal;
    font-weight: 500 600;
    font-display: swap;
    src: url("/fonts/space-grotesk-latin-ext.woff2") format('woff2');
    unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
  }
  @font-face {
    font-family: 'Space Grotesk';
    font-style: normal;
    font-weight: 500 600;
    font-display: swap;
    src: url("/fonts/space-grotesk-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;
  }

:root {
  --bg: #0d1014;
  --surface: #151921;
  --surface-2: #1b212b;
  --border: #262d38;
  --border-hover: #36404e;
  --text: #e7eaef;
  --muted: #8b94a3;
  --muted-2: #6b7382;
  --accent: #6fd0c0;
  --accent-dim: rgba(111, 208, 192, 0.12);
  --radius: 10px;
  --maxw: 940px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

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

::selection { background: var(--accent-dim); color: var(--accent); }

/* ---- Header ---- */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 22px 0;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
}
.brand .dot { color: var(--accent); }
.nav-mono {
  font-family: "JetBrains Mono", monospace;
  font-size: 12.5px;
  color: var(--muted);
}
.nav-mono a:hover { color: var(--text); }

/* ---- Hero ---- */
.hero { padding: 72px 0 40px; }
.eyebrow {
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.eyebrow::before { content: "›"; opacity: 0.7; }
h1 {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 18ch;
}
.lead {
  color: var(--muted);
  font-size: 18px;
  margin-top: 20px;
  max-width: 56ch;
}

/* ---- Catalog list ---- */
.catalog { padding: 24px 0 80px; }
.catalog-head {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted-2);
  border-bottom: 1px solid var(--border);
  padding-bottom: 14px;
  margin-bottom: 8px;
}

.book-row {
  display: grid;
  grid-template-columns: 88px 1fr auto;
  gap: 28px;
  align-items: start;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
  transition: border-color 0.2s;
}
.book-row:hover { border-color: var(--border-hover); }
.book-code {
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  color: var(--accent);
  padding-top: 4px;
}
.book-main h2 {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 500;
  font-size: 21px;
  letter-spacing: -0.01em;
  line-height: 1.25;
}
.book-main h2 a { transition: color 0.15s; }
.book-row:hover .book-main h2 a { color: var(--accent); }
.book-desc {
  color: var(--muted);
  font-size: 15px;
  margin-top: 8px;
  max-width: 54ch;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.tag {
  font-family: "JetBrains Mono", monospace;
  font-size: 11.5px;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 3px 9px;
  border-radius: 5px;
}
.book-side {
  text-align: right;
  padding-top: 2px;
  min-width: 120px;
}
.price {
  font-family: "JetBrains Mono", monospace;
  font-size: 17px;
  font-weight: 500;
  color: var(--text);
}
.book-link {
  display: inline-block;
  margin-top: 10px;
  font-size: 14px;
  color: var(--accent);
  font-family: "JetBrains Mono", monospace;
}
.book-link:hover { text-decoration: underline; }

/* ---- Detail page ---- */
.breadcrumb {
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  color: var(--muted);
  padding: 28px 0 0;
}
.breadcrumb a:hover { color: var(--text); }
.breadcrumb .sep { opacity: 0.5; margin: 0 8px; }
.breadcrumb .here { color: var(--text); }

.detail-hero { padding: 44px 0 32px; border-bottom: 1px solid var(--border); }
.detail-hero h1 { max-width: 22ch; }
.detail-lead {
  color: var(--muted);
  font-size: 19px;
  margin-top: 20px;
  max-width: 58ch;
}

.buybar {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 32px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--accent);
  color: #07100e;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  font-size: 16px;
  padding: 14px 26px;
  border-radius: var(--radius);
  transition: transform 0.12s, opacity 0.15s;
}
.btn:hover { opacity: 0.92; transform: translateY(-1px); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.buybar .price-lg {
  font-family: "JetBrains Mono", monospace;
  font-size: 20px;
  font-weight: 500;
}
.buybar .price-note { color: var(--muted-2); font-size: 13px; }

.content { padding: 48px 0; display: grid; grid-template-columns: 1fr 280px; gap: 56px; }
.prose h2 {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 500;
  font-size: 22px;
  letter-spacing: -0.01em;
  margin: 40px 0 16px;
}
.prose h2:first-child { margin-top: 0; }
.prose p { color: #c4cad4; margin-bottom: 16px; }
.prose ul { list-style: none; margin: 8px 0 16px; }
.prose li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 12px;
  color: #c4cad4;
}
.prose li::before {
  content: "›";
  position: absolute;
  left: 6px;
  color: var(--accent);
  font-family: "JetBrains Mono", monospace;
}

.meta-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  align-self: start;
  position: sticky;
  top: 24px;
}
.meta-card h3 {
  font-family: "JetBrains Mono", monospace;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted-2);
  margin-bottom: 16px;
}
.meta-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-top: 1px solid var(--border);
  font-size: 14px;
}
.meta-row:first-of-type { border-top: none; }
.meta-row .k { color: var(--muted); }
.meta-row .v { color: var(--text); font-family: "JetBrains Mono", monospace; font-size: 13px; text-align: right; }

.backlink {
  font-family: "JetBrains Mono", monospace;
  font-size: 14px;
  color: var(--accent);
  display: inline-block;
  margin: 8px 0 64px;
}
.backlink:hover { text-decoration: underline; }

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  color: var(--muted-2);
  font-size: 13.5px;
}
.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.site-footer .links { font-family: "JetBrains Mono", monospace; }
.site-footer a:hover { color: var(--text); }
.site-footer .sep { opacity: 0.5; margin: 0 8px; }

/* ---- Motion ---- */
@media (prefers-reduced-motion: no-preference) {
  .hero, .book-row, .detail-hero { animation: fadeUp 0.5s ease both; }
  .book-row:nth-child(2) { animation-delay: 0.04s; }
  .book-row:nth-child(3) { animation-delay: 0.08s; }
  .book-row:nth-child(4) { animation-delay: 0.12s; }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

/* ---- Responsive ---- */
@media (max-width: 760px) {
  .content { grid-template-columns: 1fr; gap: 36px; }
  .meta-card { position: static; }
  .book-row { grid-template-columns: 1fr; gap: 12px; padding: 24px 0; }
  .book-code { padding-top: 0; }
  .book-side { text-align: left; }
  .nav-mono { display: none; }
}