@font-face { font-family: "IBM Plex Sans"; font-weight: 400; font-display: swap; src: url("/assets/ibm-plex-sans-400-bf0c3289.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-weight: 500; font-display: swap; src: url("/assets/ibm-plex-sans-500-bf0c3289.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-weight: 600; font-display: swap; src: url("/assets/ibm-plex-sans-600-bf0c3289.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-weight: 700; font-display: swap; src: url("/assets/ibm-plex-sans-700-bf0c3289.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-weight: 400; font-display: swap; src: url("/assets/ibm-plex-mono-400-d803141a.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-weight: 500; font-display: swap; src: url("/assets/ibm-plex-mono-500-3f7bbac1.woff2") format("woff2"); }

/* Lamport Press — sales landing.
   Dark theme keyed to the series covers: purple #9945FF, blue #19A3FE,
   green #14F195. Centering rule: containers use .wrap (margin-inline auto);
   never rely on margin shorthand + max-width on text elements. */

:root {
  --bg: #0a0c11;
  --panel: #12151d;
  --panel-2: #151926;
  --line: #1e2432;
  --text: #e8eaf0;
  --muted: #9aa1b2;
  --purple: #9945ff;
  --blue: #19a3fe;
  --green: #14f195;
  --teal: #16d1c6;
  --grad: linear-gradient(90deg, var(--purple), var(--blue), var(--green));
  --radius: 14px;
  --sans: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
section[id], header[id], article[id] { scroll-margin-top: 4.5rem; }

body {
  margin: 0;
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.65;
  background:
    radial-gradient(50rem 30rem at 15% -5%, rgba(153, 69, 255, 0.16), transparent 60%),
    radial-gradient(45rem 28rem at 85% 8%, rgba(25, 163, 254, 0.13), transparent 60%),
    radial-gradient(60rem 34rem at 50% 110%, rgba(20, 241, 149, 0.07), transparent 60%),
    var(--bg);
}

a { color: var(--blue); }

.wrap { max-width: 64rem; margin-inline: auto; padding-inline: 1.25rem; }
.wrap.narrow { max-width: 46rem; }

.eyebrow {
  font-family: var(--mono);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.75rem;
  color: var(--green);
  text-align: center;
  margin: 0 0 0.6rem;
}

h2 {
  font-size: 1.9rem;
  text-align: center;
  margin-block: 0 1.75rem;
}
h2::after {
  content: "";
  display: block;
  width: 4rem;
  height: 3px;
  border-radius: 3px;
  background: var(--grad);
  margin: 0.7rem auto 0;
}

section, .hero, .colophon { padding-block: 3.5rem; }

/* ---- Navbar ---- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 12, 17, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 0.6rem;
}
.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.85rem;
}
.nav-mark { width: 30px; height: 30px; }
.nav-links { display: flex; gap: 1.6rem; }
.nav-links a {
  color: var(--muted);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 600;
  padding-block: 0.4rem;
  position: relative;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grad);
  transform: scaleX(0);
  transition: transform 0.18s ease;
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); }
.nav-links a.active { color: var(--text); }
@media (max-width: 640px) {
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 0.7rem; letter-spacing: 0.1em; }
  .nav-brand span { display: none; }
}

/* ---- Hero ---- */
.hero { text-align: center; padding-block: 2rem 1rem; }

.mark { width: 52px; height: 52px; flex: none; }

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.5rem;
  align-items: center;
  text-align: left;
  margin-top: 1rem;
}
.hero h1 {
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  line-height: 1.18;
  margin-block: 0 1rem;
  letter-spacing: 0.02em;
  font-weight: 700;
  text-transform: uppercase;
}
.h1-grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Curriculum rail */
.path {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 0;
  margin: 3rem auto 0.4rem;
  max-width: 60rem;
  position: relative;
}
.path::before {
  content: "";
  position: absolute;
  top: 5px;
  left: 6%;
  right: 6%;
  height: 2px;
  background: var(--grad);
  opacity: 0.9;
}
.path-node {
  flex: 1;
  position: relative;
  font-family: var(--mono);
  font-size: 0.84rem;
  color: #c3c9d6;
  text-align: center;
  padding: 0 0.3rem;
  line-height: 1.35;
}
.path-node .dot {
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin: 0 auto 0.5rem;
  background: var(--bg);
  border: 2.5px solid var(--blue);
  position: relative;
  z-index: 1;
}
.path-node:nth-child(-n+3) .dot { border-color: var(--purple); }
.path-node:nth-child(4) .dot { border-color: var(--blue); }
.path-node:nth-child(5) .dot { border-color: var(--teal); }
.path-node:nth-child(6) .dot { border-color: var(--green); }
.path-node:last-child .dot {
  border-color: var(--green);
  background: var(--green);
  box-shadow: 0 0 12px rgba(20, 241, 149, 0.7);
}
.path-node:last-child { color: var(--text); font-weight: 600; }
@media (max-width: 720px) {
  .path {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.9rem;
    width: fit-content;
    margin-inline: auto;
  }
  .path::before {
    top: 8px;
    bottom: 8px;
    left: 5px;
    right: auto;
    width: 2px;
    height: auto;
    background: linear-gradient(180deg, var(--purple), var(--blue), var(--green));
  }
  .path-node {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    flex: none;
    padding: 0;
    text-align: left;
    font-size: 0.88rem;
  }
  .path-node .dot { margin: 0; }
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .claim { margin-inline: auto; }
  .cover-fan { order: 2; }
}
.claim {
  font-size: 1.25rem;
  color: var(--text);
  margin-block: 0 0.4rem;
  max-width: 30rem;
}
.hero-actions { margin-block: 1.6rem 0.6rem; }
.reassure { font-family: var(--mono); color: var(--muted); font-size: 0.82rem; margin-block: 0; }

/* Fanned covers */
.cover-fan {
  display: flex;
  justify-content: center;
  align-items: center;
  padding-block: 1.5rem;
}
.cover-fan a { display: block; margin-inline: -14px; }
.cover-fan img {
  width: clamp(110px, 11vw, 150px);
  height: auto;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 22px 45px rgba(0, 0, 0, 0.55), 0 0 34px var(--glow, rgba(25, 163, 254, 0.28));
  transition: transform 0.25s ease;
}
.cover-fan a:nth-child(1) img { --glow: rgba(153, 69, 255, 0.32); }
.cover-fan a:nth-child(2) img { --glow: rgba(25, 163, 254, 0.32); }
.cover-fan a:nth-child(3) img { --glow: rgba(22, 209, 198, 0.30); }
.cover-fan a:nth-child(4) img { --glow: rgba(20, 241, 149, 0.30); }
.cover-fan a:nth-child(1) img { transform: rotate(-9deg) translate(26px, 12px); }
.cover-fan a:nth-child(2) img { transform: rotate(-3deg) translateY(-4px); }
.cover-fan a:nth-child(3) img { transform: rotate(3deg) translateY(-4px); }
.cover-fan a:nth-child(4) img { transform: rotate(9deg) translate(-26px, 12px); }
.cover-fan a:nth-child(1) { z-index: 1; }
.cover-fan a:nth-child(2) { z-index: 2; }
.cover-fan a:nth-child(3) { z-index: 3; }
.cover-fan a:nth-child(4) { z-index: 4; }
.cover-fan a:hover { z-index: 5; }
.cover-fan a:hover img { transform: rotate(0) translateY(-14px); }

/* ---- Buttons ---- */
.button {
  display: inline-block;
  padding: 0.65rem 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.button:hover { transform: translateY(-1px); }
.button.primary {
  border: none;
  background: var(--grad);
  color: #071018;
  box-shadow: 0 8px 28px rgba(25, 163, 254, 0.35);
}
.button.primary:hover { box-shadow: 0 10px 34px rgba(93, 116, 255, 0.5); }
.button.big { font-size: 1.15rem; padding: 0.9rem 2rem; }
.button.disabled { opacity: 0.55; cursor: default; }
.button.disabled:hover { transform: none; }

/* ---- Method ---- */
.method-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(22rem, 1fr));
  gap: 1.25rem;
}
.method-grid > div {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.method-grid > div:hover { transform: translateY(-3px); border-color: #2a3247; }
.method-grid h3 {
  margin: 0 0 0.5rem;
  color: var(--green);
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.method-grid p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* ---- Volumes ---- */
.volumes { display: grid; gap: 1.5rem; }
.volume {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 1.75rem;
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line);
  border-top: 3px solid var(--vc, var(--blue));
  border-radius: var(--radius);
  padding: 1.5rem;
  align-items: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.volume:hover {
  transform: translateY(-3px);
  border-color: #2a3247;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}
.volume img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.5);
}
.vol-number {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.75rem;
  color: var(--vc, var(--muted));
  margin: 0;
}
.start-badge {
  background: var(--green);
  color: #06281a;
  border-radius: 999px;
  padding: 0.1rem 0.6rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-left: 0.5rem;
  vertical-align: middle;
}
.outcome {
  font-family: var(--mono);
  color: var(--text);
  font-size: 0.85rem;
  border-left: 3px solid var(--vc, var(--green));
  padding-left: 0.7rem;
  margin: 0 0 1rem;
}
.volume h3 { margin: 0.1rem 0 0; font-size: 1.5rem; }
.tagline { color: var(--vc, var(--green)); margin: 0 0 0.2rem; }
.contents { font-family: var(--mono); color: var(--muted); font-size: 0.8rem; margin: 0 0 0.6rem; }
.volume ul { margin: 0 0 1rem; padding-left: 1.2rem; color: var(--muted); font-size: 0.95rem; }
.volume li { margin-bottom: 0.3rem; }
@media (max-width: 640px) {
  .volume { grid-template-columns: 1fr; }
  .volume img { max-width: 230px; margin-inline: auto; }
}

/* ---- Bundle ---- */
.bundle { text-align: center; }
.bundle-panel {
  position: relative;
  border-radius: var(--radius);
  padding: 2.5rem 1.5rem;
  background:
    linear-gradient(var(--panel), var(--panel)) padding-box,
    var(--grad) border-box;
  border: 1px solid transparent;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}
.deal { font-family: var(--mono); font-size: 2rem; margin-block: 0.4rem 1rem; }
.deal s { color: var(--muted); font-size: 1.3rem; margin-right: 0.4rem; }
.badge {
  background: var(--green);
  color: #06281a;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
  vertical-align: middle;
  margin-left: 0.5rem;
}
.checklist {
  list-style: none;
  padding: 0;
  margin: 0 auto 1.8rem;
  max-width: 30rem;
  text-align: left;
  color: var(--muted);
}
.checklist li { padding-left: 1.6rem; position: relative; margin-bottom: 0.4rem; }
.checklist li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--green);
  font-weight: 700;
}

/* ---- FAQ ---- */
.faq details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  margin-bottom: 0.6rem;
  padding: 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 650;
  padding: 0.9rem 1.1rem;
  list-style: none;
  position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 1.1rem;
  color: var(--green);
  font-weight: 700;
}
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 0; padding: 0 1.1rem 1rem; color: var(--muted); }

/* ---- Author ---- */
.author-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.75rem;
  align-items: start;
}
.author-card h2 { text-align: left; font-size: 1.35rem; margin-block: 0 0.5rem; }
.author-card h2::after { margin-left: 0; width: 3rem; }
.author-card p { margin: 0 0 0.7rem; color: var(--muted); }
.avatar-photo {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid transparent;
  background: linear-gradient(var(--panel), var(--panel)) padding-box,
              linear-gradient(135deg, var(--purple), var(--blue), var(--green)) border-box;
}
@media (max-width: 520px) {
  .author-card { grid-template-columns: 1fr; }
}

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--line);
  padding-block: 3rem 1.5rem;
  color: var(--muted);
  font-size: 0.92rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 2rem;
}
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 460px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-brand .mark { width: 44px; height: 44px; }
.footer-name {
  font-weight: 750;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text);
  font-size: 0.9rem;
  margin: 0.6rem 0 0;
}
.footer-tag { font-family: var(--mono); margin: 0 0 0.8rem; font-size: 0.82rem; }
.footer-note { font-size: 0.82rem; margin: 0; max-width: 16rem; }
.site-footer h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text);
  margin: 0.3rem 0 0.8rem;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 0.45rem; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--text); }
.footer-note a, .footer-bottom a { text-decoration: underline; }
.footer-bottom {
  border-top: 1px solid var(--line);
  margin-top: 2.5rem;
  padding-top: 1.4rem;
  text-align: center;
}
.footer-bottom p { margin: 0 0 0.35rem; }
.fb-imprint { font-size: 0.88rem; color: var(--text); }
.fb-imprint strong { letter-spacing: 0.06em; }
.fb-legal { font-family: var(--mono); font-size: 0.78rem; }
.fb-disclaimer { font-size: 0.78rem; color: var(--ink-faint, #5a6675); opacity: 0.85; }

/* ---- Admin dashboard ---- */
.admin { min-height: 100vh; }
.admin h2 { margin-bottom: 2rem; }
.stat-row { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; margin-bottom: 2.5rem; }
.stat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.6rem;
  text-align: center;
  min-width: 9rem;
}
.stat strong {
  display: block;
  font-family: var(--mono);
  font-size: 1.8rem;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat span { color: var(--muted); font-size: 0.85rem; }
.admin-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
@media (max-width: 640px) { .admin-grid { grid-template-columns: 1fr; } }
.admin h3 {
  font-family: var(--mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--green);
  margin: 1.5rem 0 0.6rem;
}
.admin ul { list-style: none; padding: 0; margin: 0; color: var(--muted); }
.admin li { margin-bottom: 0.35rem; }

/* ---- Accessibility ---- */
a:focus-visible, .button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* ---- Privacy ---- */
.privacy { min-height: 70vh; }
.privacy h2 { text-align: left; }
.privacy h2::after { margin-left: 0; }
.privacy .eyebrow { text-align: left; }
.privacy ul { color: var(--muted); padding-left: 1.2rem; }
.privacy li { margin-bottom: 0.8rem; }

/* ---- Book pages ---- */
.book-hero { padding-block: 3rem 2rem; }
.book-grid {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 2.5rem;
  align-items: center;
}
@media (max-width: 700px) { .book-grid { grid-template-columns: 1fr; text-align: center; }
  .book-cover img { max-width: 220px; margin-inline: auto; }
  .book-hero .outcome { text-align: left; } }
.book-cover img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.55), 0 0 34px color-mix(in srgb, var(--vc) 30%, transparent);
}
.book-hero h1 { font-size: clamp(2.2rem, 5vw, 3.2rem); margin: 0.1rem 0 0.2rem; }
.book-hero .tagline { font-size: 1.15rem; }
.book-blurb { color: var(--muted); max-width: 34rem; }
.book-hero .hero-actions { margin-block: 1.4rem 0.5rem; }

.toc h2 { margin-bottom: 1.5rem; }
.toc-list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  columns: 1;
}
.toc-list li {
  display: flex;
  gap: 0.8rem;
  padding: 0.55rem 0.2rem;
  border-bottom: 1px solid var(--line);
  color: var(--text);
}
.toc-list li span {
  font-family: var(--mono);
  color: var(--vc, var(--green));
  min-width: 1.8rem;
  text-align: right;
}
.toc-list .toc-extra { color: var(--muted); }
.toc-note { color: var(--muted); font-size: 0.92rem; max-width: 38rem; }
.toc .hero-actions { text-align: center; }

.book-nav { border-top: 1px solid var(--line); }
.book-nav-row { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.book-nav a { color: var(--muted); text-decoration: none; font-family: var(--mono); font-size: 0.85rem; }
.book-nav a:hover { color: var(--text); }


/* ---- Cover art links to the volume page ---- */
.cover-link { display: block; }
.cover-link img { transition: transform 0.18s ease, opacity 0.18s ease; }
.cover-link:hover img { transform: translateY(-2px); opacity: 0.92; }
.cover-link:focus-visible { outline: 2px solid var(--vc, var(--blue)); outline-offset: 3px; }

/* ---- Volumes not sold separately ---- */
/* Tokens, Token Extensions and Frontiers are written to build on what came
   before, so they ship inside the series rather than as standalone products.
   The card still needs to close on something, hence a note where the buy
   button used to sit. */
.in-series {
  margin: 0;
  padding: 0.55rem 0;
  font-family: var(--mono);
  font-size: 0.86rem;
  color: var(--muted);
  border-top: 1px solid var(--rule, rgba(255,255,255,0.12));
}

/* Secondary route under the main series CTA: Basics on its own. */
.alt-buy {
  margin: 1.1rem 0 0;
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--muted);
}
.alt-buy strong { color: inherit; }
.alt-buy a {
  color: var(--vc, var(--blue));
  text-decoration: none;
  white-space: nowrap;
}
.alt-buy a:hover { text-decoration: underline; }

.toc-link { margin: 0 0 1rem; font-size: 0.92rem; }
.toc-link a { color: var(--vc, var(--blue)); text-decoration: none; }
.toc-link a:hover { text-decoration: underline; }

/* ---- One-page preview ---- */
.page-preview figure { margin: 0; text-align: center; }
.page-preview img {
  width: 100%;
  max-width: 640px;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 26px 60px rgba(0, 0, 0, 0.6), 0 0 40px color-mix(in srgb, var(--vc) 22%, transparent);
}
.page-preview figcaption {
  color: var(--muted);
  font-size: 0.88rem;
  margin-top: 1rem;
}