:root{
  --paper: #ffffff;
  --ink:   #111111;
  --ink-soft: #6b6b6b;
  --ink-faint: #a3a3a3;
  --line:  #e7e7e7;
  --font:  "Montserrat", -apple-system, sans-serif;
  --pad: clamp(22px, 5.4vw, 55px);
  --ease: cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font);
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
::selection{background:var(--ink);color:var(--paper)}
a:focus-visible,button:focus-visible{outline:2px solid var(--ink);outline-offset:3px}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important}
}

/* ---------- header ---------- */
.site-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:18px var(--pad);
}
.wordmark{
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
}
.top-nav{
  display:none;
  align-items:center;
  gap:42px;
}
.top-nav a{
  font-size:13px;
  font-weight:600;
  letter-spacing:.04em;
  text-transform:uppercase;
  padding-bottom:9px;
  border-bottom:1px solid transparent;
}
.top-nav a[aria-current="page"]{border-bottom-color:var(--ink)}
@media (hover:hover){
  .top-nav a:hover{border-bottom-color:var(--ink)}
}
.menu-toggle{
  background:none;
  border:none;
  cursor:pointer;
  padding:6px;
  display:flex;
  flex-direction:column;
  gap:4px;
  width:26px;
}
.menu-toggle span{
  display:block;
  height:2px;
  background:var(--ink);
  transition:transform .3s var(--ease), opacity .3s var(--ease);
}
.menu-toggle.is-open span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.menu-toggle.is-open span:nth-child(2){opacity:0}
.menu-toggle.is-open span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.mobile-menu{
  position:fixed;
  inset:0;
  top:66px;
  background:var(--paper);
  padding:20px var(--pad) 40px;
  transform:translateY(-8px);
  opacity:0;
  pointer-events:none;
  transition:opacity .25s var(--ease), transform .25s var(--ease);
  z-index:30;
}
.mobile-menu.is-open{
  opacity:1;
  transform:translateY(0);
  pointer-events:auto;
}
.mobile-menu a{
  display:block;
  font-size:clamp(20px,6vw,24px);
  font-weight:600;
  padding:16px 0;
}
.mobile-menu a[aria-current="page"]{color:var(--ink-soft)}

@media (min-width:860px){
  .top-nav{display:flex}
  .menu-toggle{display:none}
}

/* ---------- home ---------- */
.home-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:32px;
  padding:32px var(--pad) 0;
}
.side-nav{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
}
.side-nav a{
  font-size:clamp(21px, 4.6vw, 27px);
  font-weight:600;
  padding:15px 0;
  transition:color .25s var(--ease);
}
@media (hover:hover){
  .side-nav a:hover{color:var(--ink-soft)}
}
.cover-wrap{
  display:flex;
  justify-content:center;
}
.cover-img{
  max-height:clamp(140px, 22vh, 260px);
  width:auto;
  transition:transform .3s var(--ease);
}
@media (hover:hover){
  .cover-wrap:hover .cover-img{transform:scale(1.05)}
}

@media (min-width:860px){
  .home-grid{
    grid-template-columns:0.9fr 1fr;
    padding-left:calc(var(--pad) + 6.5vw);
    align-items:center;
    min-height:calc(100vh - 66px - 90px);
  }
  .side-nav a{text-align:left}
  .cover-wrap{justify-content:flex-start}
  .cover-img{max-height:50vh}
}

/* ---------- footer ---------- */
.site-footer{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  padding:26px var(--pad) 48px;
  font-size:12px;
  color:var(--ink-soft);
  text-align:center;
}
.footer-links{display:flex;gap:22px}
.footer-links a{
  font-weight:600;
  letter-spacing:.03em;
  text-transform:uppercase;
  font-size:11px;
  color:var(--ink);
}
@media (hover:hover){
  .footer-links a:hover{color:var(--ink-soft)}
}

@media (min-width:860px){
  .site-footer{
    flex-direction:row;
    justify-content:space-between;
    align-items:center;
    text-align:left;
  }
}

/* ---------- inner pages ---------- */
.page-header{padding:64px var(--pad) 0}
.back-link{font-size:13px;color:var(--ink-soft);font-weight:600}
@media (hover:hover){.back-link:hover{color:var(--ink)}}
.page-title{
  font-size:clamp(32px, 6vw, 58px);
  font-weight:700;
  line-height:1.05;
  letter-spacing:-.01em;
  margin:24px 0 0;
}
.page-lede{
  font-size:clamp(15px,1.8vw,18px);
  color:var(--ink-soft);
  max-width:52ch;
  line-height:1.6;
  margin:18px 0 0;
}

.block-list{padding:0 var(--pad);margin-top:44px;border-top:1px solid var(--line)}
.block{padding:22px 0;border-bottom:1px solid var(--line)}
.block-label{
  font-size:11px;
  font-weight:700;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--ink-faint);
  margin:0 0 8px;
}
.block-text{font-size:15px;line-height:1.65;max-width:60ch}

.contact-list{padding:40px var(--pad) 0}
.contact-row{
  display:flex;
  justify-content:space-between;
  align-items:baseline;
  gap:20px;
  padding:20px 0;
  border-bottom:1px solid var(--line);
  font-size:clamp(19px,3.4vw,28px);
  font-weight:600;
}
.contact-row span{
  font-size:11px;
  font-weight:700;
  letter-spacing:.08em;
  color:var(--ink-faint);
}
@media (hover:hover){.contact-row a:hover{color:var(--ink-soft)}}

/* ============================================================
   BOOK PAGE — hero, sections, reader
   ============================================================ */
.book-page{ }
.book-page .body-font{font-family:"Inter",-apple-system,sans-serif}

.book-hero{
  display:grid;
  grid-template-columns:1fr;
  gap:20px;
  padding:20px var(--pad) 0;
}
.book-hero-visual{
  order:1;
  display:flex;
  align-items:center;
  justify-content:center;
}
.book-hero-content{order:2}

@media (min-width:860px){
  .book-hero{
    grid-template-columns:45fr 55fr;
    align-items:start;
    gap:5vw;
    padding-top:1.6vh;
  }
  .book-hero-visual{justify-content:center;align-self:center}
}

.book-cover-interactive{
  position:relative;
  background:none;
  border:none;
  padding:0;
  cursor:pointer;
  display:block;
}
.book-cover-interactive img{
  max-height:clamp(200px, 30vh, 320px);
  width:auto;
  transform:rotate(-3deg);
  transition:transform .35s var(--ease);
}
@media (hover:hover){
  .book-cover-interactive:hover img{transform:rotate(-3deg) scale(1.02)}
}

@media (min-width:860px){
  .book-cover-interactive img{max-height:68vh}
}

.book-eyebrow{
  font-size:12px;
  font-weight:600;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--ink-faint);
  margin:0 0 8px;
}
.book-hero-content .page-title{
  margin-top:0;
  font-size:clamp(28px, 4.4vw, 44px);
}
.book-subtitle{
  font-family:var(--font);
  font-size:clamp(17px,2.2vw,21px);
  font-weight:500;
  color:var(--ink-soft);
  margin:10px 0 0;
}
.book-desc{margin:18px 0 0}
.book-desc p{
  font-family:"Inter",-apple-system,sans-serif;
  font-size:14.5px;
  line-height:1.65;
  color:var(--ink);
  max-width:52ch;
  margin:0 0 12px;
}
.book-cta-row{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
  margin-top:20px;
}
.btn{
  font-family:var(--font);
  font-size:13px;
  font-weight:600;
  letter-spacing:.02em;
  padding:14px 26px;
  border-radius:2px;
  cursor:pointer;
  border:1px solid var(--ink);
  background:var(--ink);
  color:var(--paper);
  transition:opacity .25s var(--ease);
}
.btn-outline{
  background:none;
  color:var(--ink);
}
@media (hover:hover){
  .btn:hover{opacity:.75}
}
.buy-wrap{position:relative;display:inline-block}
.buy-menu{
  position:absolute;
  top:calc(100% + 8px);
  left:0;
  min-width:200px;
  background:var(--paper);
  border:1px solid var(--line);
  padding:6px 0;
  opacity:0;
  transform:translateY(-6px);
  pointer-events:none;
  transition:opacity .2s var(--ease), transform .2s var(--ease);
  z-index:20;
}
.buy-menu.is-open{opacity:1;transform:translateY(0);pointer-events:auto}
.buy-menu a{
  display:block;
  font-size:13px;
  padding:10px 18px;
  color:var(--ink);
}
@media (hover:hover){
  .buy-menu a:hover{background:var(--paper-dim,#f4f4f2)}
}
.format-links{
  display:flex;
  gap:22px;
  margin-top:12px;
}
.format-links a{
  font-size:12px;
  font-weight:600;
  letter-spacing:.03em;
  text-transform:uppercase;
  color:var(--ink-soft);
  border-bottom:1px solid var(--ink-soft);
}
@media (hover:hover){
  .format-links a:hover{color:var(--ink);border-color:var(--ink)}
}

.book-section{
  padding:56px var(--pad) 0;
  max-width:820px;
}
.book-section.wide{max-width:none}
.book-section h2{
  font-family:var(--font);
  font-size:clamp(24px,3.4vw,32px);
  font-weight:700;
  margin:0 0 26px;
}
.book-section .body-font p{
  font-family:"Inter",-apple-system,sans-serif;
  font-size:15px;
  line-height:1.8;
  color:var(--ink);
  max-width:64ch;
  margin:0 0 18px;
}

.idea-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:40px;
  margin-top:8px;
}
@media (min-width:700px){
  .idea-grid{grid-template-columns:1fr 1fr}
}
.idea-block{padding-top:18px;border-top:1px solid var(--line)}
.idea-num{
  font-size:12px;
  color:var(--ink-faint);
  font-weight:600;
  letter-spacing:.06em;
}
.idea-block p{
  font-family:"Inter",-apple-system,sans-serif;
  font-size:15px;
  line-height:1.7;
  margin:10px 0 0;
  max-width:44ch;
}

.metrics-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:0;
  margin-top:8px;
  border-top:1px solid var(--line);
  border-left:1px solid var(--line);
}
@media (min-width:700px){
  .metrics-grid{grid-template-columns:repeat(4,1fr)}
}
.metric-cell{
  padding:22px 18px;
  border-right:1px solid var(--line);
  border-bottom:1px solid var(--line);
  font-family:var(--font);
  font-size:14px;
  font-weight:600;
}

.author-block{
  display:grid;
  grid-template-columns:1fr;
  gap:24px;
  margin-top:8px;
  align-items:start;
}
@media (min-width:700px){
  .author-block{grid-template-columns:180px 1fr}
}
.author-name{font-weight:700;font-size:17px}

.spec-list{margin-top:8px}
.spec-row{
  display:flex;
  justify-content:space-between;
  gap:20px;
  padding:16px 0;
  border-bottom:1px solid var(--line);
  font-size:14px;
}
.spec-row span:first-child{
  color:var(--ink-faint);
  font-weight:600;
  letter-spacing:.03em;
  text-transform:uppercase;
  font-size:11px;
}
.spec-row span:last-child{
  font-family:"Inter",-apple-system,sans-serif;
  text-align:right;
  max-width:56%;
}

.spec-compact{
  margin:16px 0 0;
  padding-top:12px;
  border-top:1px solid var(--line);
}
.spec-compact-row{
  display:flex;
  justify-content:space-between;
  gap:16px;
  padding:6px 0;
  font-size:13px;
  font-family:"Inter",-apple-system,sans-serif;
}
.spec-compact-row span:first-child{
  color:var(--ink-faint);
  font-family:var(--font);
  font-weight:600;
  letter-spacing:.03em;
  text-transform:uppercase;
  font-size:10px;
}
.spec-compact-row span:last-child{text-align:right}

.final-cta{
  text-align:center;
  padding:64px var(--pad) 72px;
}
.final-cta p{
  font-family:"Inter",-apple-system,sans-serif;
  font-size:clamp(17px,2.4vw,21px);
  color:var(--ink-soft);
  max-width:36ch;
  margin:0 auto 30px;
  line-height:1.6;
}
.final-cta .book-cta-row{justify-content:center}

/* ---------- reader (opens in place of the cover) ---------- */
.book-cover-stage{
  position:relative;
  display:inline-block;
}
.reader{
  position:absolute;
  inset:0;
  background:#fdfdfb;
  display:flex;
  flex-direction:column;
  padding:clamp(16px,3vw,28px) clamp(18px,3.4vw,32px);
  box-shadow:0 24px 48px -20px rgba(0,0,0,.28);
  opacity:0;
  transform:rotate(-3deg);
  pointer-events:none;
  transition:opacity .35s var(--ease);
  z-index:5;
}
.reader.is-open{opacity:1;pointer-events:auto;transform:rotate(0deg)}
.reader-close{
  position:absolute;
  top:12px;
  right:12px;
  background:none;
  border:none;
  color:var(--ink-faint);
  font-size:16px;
  cursor:pointer;
  padding:6px;
  z-index:2;
}
@media (hover:hover){
  .reader-close:hover{color:var(--ink)}
}
.reader-head{
  font-family:var(--font);
  font-size:9px;
  font-weight:700;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--ink-faint);
  text-align:center;
  padding-bottom:12px;
  border-bottom:1px solid var(--line);
}
.reader-body{
  flex:1;
  overflow:hidden;
  padding-top:16px;
  font-family:"Inter",-apple-system,sans-serif;
  font-size:12px;
  line-height:1.68;
  color:var(--ink);
  opacity:1;
  transition:opacity .25s var(--ease);
  text-align:justify;
}
.reader-body.is-turning{opacity:0}
.reader-body p{margin:0 0 10px}
.reader-foot{
  font-family:var(--font);
  font-size:8.5px;
  font-weight:700;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--ink-faint);
  text-align:center;
  padding-top:12px;
  border-top:1px solid var(--line);
  display:flex;
  justify-content:space-between;
  align-items:center;
}
.reader-nav{
  position:absolute;
  top:50%;
  transform:translateY(-50%);
  width:36px;
  height:36px;
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  background:rgba(17,17,17,.06);
  border:none;
  color:var(--ink-soft);
  font-size:20px;
  line-height:1;
  cursor:pointer;
  opacity:.85;
  transition:opacity .2s var(--ease), background .2s var(--ease);
  z-index:6;
}
@media (hover:hover){
  .reader-nav:hover{opacity:1;background:rgba(17,17,17,.1)}
}
.reader-nav.prev{left:-16px}
.reader-nav.next{right:-16px}
.reader-end p{
  font-family:"Inter",-apple-system,sans-serif;
  font-size:13px;
  line-height:1.6;
  text-align:center;
  margin:0 0 18px;
}
.reader-end{
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  height:100%;
  text-align:center;
}

@media (max-width:640px){
  .reader-nav{width:32px;height:32px;font-size:17px}
  .reader-nav.prev{left:-12px}
  .reader-nav.next{right:-12px}
}

@media (prefers-reduced-motion: reduce){
  .reader,.reader-body,.book-cover-interactive img{transition:none !important}
}