/* =========================================================
   books.css
   Shared stylesheet for the individual book pages.
   Tokens and components match index.html and sponsor.html.
   ========================================================= */

:root{
  --fog:      #E9ECEE;
  --fog-deep: #DBE0E4;
  --ink:      #171C24;
  --slate:    #5A6470;
  --kumkum:   #8E2F22;

  /* Theme tokens. Light values here, dark overrides below. */
  --accent-rgb: 142,47,34;
  --scrim:      233,236,238;
  --shadow-rgb: 23,28,36;
  --fog-deep-2: #C6CDD3;
  --text-body:  #2C333D;
  --text-soft:  #3A424D;
  --text-faint: #8A939D;
  --hairline:        rgba(var(--shadow-rgb),.14);
  --hairline-strong: rgba(var(--shadow-rgb),.22);
  --hover-wash:      rgba(var(--shadow-rgb),.06);
  --card:            rgba(255,255,255,.42);
  --card-hover:      rgba(255,255,255,.70);
  --field-bg:        rgba(255,255,255,.60);
  --field-border:    rgba(var(--shadow-rgb),.28);
  --glow:            rgba(255,255,255,.9);
  --glow-out:        rgba(255,255,255,0);
  --title-grad: radial-gradient(130% 150% at 18% 14%,
      #5C6672 0%, #444E5A 30%, #6B3128 68%, #171C24 100%);

  --display: "Eczar", Georgia, serif;
  --body:    "Newsreader", Georgia, serif;
  --util:    "IBM Plex Sans", system-ui, sans-serif;

  --measure: 62ch;
  --gutter: clamp(1.25rem, 5vw, 5rem);
  --rule: 1px solid var(--hairline);
}

*,*::before,*::after{ box-sizing:border-box; }

html{ scroll-behavior:smooth; overflow-x:clip; color-scheme:light; }

body{
  margin:0;
  position:relative;
  background:
    radial-gradient(64% 44% at 84% -8%, rgba(var(--accent-rgb),.10) 0%, var(--glow-out) 62%),
    radial-gradient(58% 40% at 4% 2%, var(--glow) 0%, var(--glow-out) 66%),
    var(--fog);
  background-repeat:no-repeat;
  color:var(--ink);
  font-family:var(--body);
  font-size:clamp(1.02rem, .96rem + .3vw, 1.18rem);
  font-weight:300;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  transition:color .4s ease, background-color .4s ease;
}

a{ color:inherit; }

.wrap{ max-width:1180px; margin:0 auto; padding-inline:var(--gutter); }

.eyebrow{
  font-family:var(--util);
  font-size:.7rem;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--slate);
  margin:0 0 1.4rem;
}

:focus-visible{ outline:2px solid var(--kumkum); outline-offset:3px; }

/* ---------- Masthead ---------- */

.masthead{
  position:sticky; top:0; z-index:20;
  backdrop-filter:blur(8px);
  background:rgba(var(--scrim),.82);
  border-bottom:var(--rule);
}
.masthead-inner{
  display:flex; align-items:center;
  gap:1.5rem; padding-block:.95rem;
}
.wordmark{
  font-family:var(--display); font-weight:600; font-size:1.02rem;
  letter-spacing:.02em; text-decoration:none; white-space:nowrap;
}
.masthead nav{ display:flex; gap:clamp(1rem,3vw,2.2rem); margin-left:auto; }
.masthead nav a{
  font-family:var(--util); font-size:.78rem; letter-spacing:.08em;
  text-transform:uppercase; text-decoration:none; color:var(--slate);
  padding-block:.2rem; transition:color .25s ease;
}
.masthead nav a:hover{ color:var(--ink); }

/* Hamburger, hidden on desktop */
.nav-toggle{
  display:none;
  width:44px; height:44px; margin-right:-.6rem;
  align-items:center; justify-content:center;
  background:none; border:0; padding:0; cursor:pointer;
  color:var(--ink);
}
.nav-toggle-bars{
  position:relative; display:block;
  width:22px; height:1.5px; background:currentColor;
  transition:background .2s ease;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:""; position:absolute; left:0;
  width:22px; height:1.5px; background:currentColor;
  transition:transform .28s cubic-bezier(.2,.7,.3,1);
}
.nav-toggle-bars::before{ top:-7px; }
.nav-toggle-bars::after{ top:7px; }
.nav-toggle[aria-expanded="true"]{ color:var(--kumkum); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{ background:transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{ transform:translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{ transform:translateY(-7px) rotate(-45deg); }

@media (max-width:720px){
  .js .nav-toggle{ display:flex; }
  .masthead-inner{ gap:1rem; }
  .wordmark{ font-size:.95rem; }

  .js .masthead nav{
    position:absolute; left:0; right:0; top:100%;
    flex-direction:column; gap:0;
    background:rgba(var(--scrim),.97);
    backdrop-filter:blur(8px);
    border-bottom:var(--rule);
    padding:.4rem var(--gutter) 1rem;
    box-shadow:0 22px 30px -28px rgba(var(--shadow-rgb),.7);
    opacity:0; visibility:hidden;
    transform:translateY(-8px);
    transition:opacity .25s ease, transform .25s ease, visibility .25s;
  }
  .js .masthead nav.open{
    opacity:1; visibility:visible; transform:none;
  }
  .js .masthead nav a{
    font-size:.9rem; letter-spacing:.12em;
    padding-block:.95rem;
    border-bottom:var(--rule);
  }
  .js .masthead nav a:last-child{ border-bottom:0; }
}

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

.btn{
  font-family:var(--util); font-size:.8rem; letter-spacing:.09em;
  text-transform:uppercase; text-decoration:none;
  padding:.85rem 1.6rem; border:1px solid var(--ink);
  transition:background .25s ease, color .25s ease, border-color .25s ease;
}
.btn-solid{ background:var(--ink); color:var(--fog); }
.btn-solid:hover{ background:var(--kumkum); border-color:var(--kumkum); }
.btn-ghost:hover{ background:var(--hover-wash); }

/* ---------- Sections ---------- */

.section{ padding-block:clamp(3.5rem,9vh,6rem); border-top:var(--rule); }
.section-head{ margin-bottom:3rem; }
.section-title{
  font-family:var(--display); font-weight:500;
  font-size:clamp(1.7rem,1.2rem + 2vw,2.9rem);
  line-height:1.12; letter-spacing:-.015em; margin:0;
}
.section-note{ max-width:var(--measure); color:var(--slate); margin:1rem 0 0; }

/* ---------- Page hero ---------- */

.page-hero{ padding-block:clamp(2.6rem,8vh,4.5rem) clamp(2.5rem,7vh,4rem); }
.back-link{
  font-family:var(--util); font-size:.72rem; letter-spacing:.14em;
  text-transform:uppercase; text-decoration:none; color:var(--slate);
  display:inline-block; margin-bottom:2.4rem;
  transition:color .25s ease;
}
.back-link:hover{ color:var(--kumkum); }

.page-title{
  font-family:var(--display); font-weight:600;
  font-size:clamp(2rem,1.3rem + 3.4vw,3.6rem);
  line-height:1.04; letter-spacing:-.025em;
  margin:0 0 1.1rem; max-width:17ch;
  color:var(--ink);
  background-image:var(--title-grad);
  -webkit-background-clip:text; background-clip:text;
  -webkit-text-fill-color:transparent;
}
@supports not ((background-clip:text) or (-webkit-background-clip:text)){
  .page-title{ -webkit-text-fill-color:var(--ink); color:var(--ink); }
}

/* ---------- Book lead ---------- */

.book-lead{
  display:grid;
  grid-template-columns:minmax(170px,262px) 1fr;
  gap:clamp(1.8rem,5vw,4rem);
  align-items:start;
}
.cover-xl{
  position:relative; display:block; overflow:hidden;
  aspect-ratio:2/3;
  background:linear-gradient(168deg,#20283A 0%,#141A26 58%,#0D1119 100%);
  border-radius:1px;
  box-shadow:0 1px 0 rgba(var(--shadow-rgb),.18),
             20px 26px 52px -26px rgba(var(--shadow-rgb),.62);
}
.cover-xl img{
  position:absolute; inset:0;
  width:100%; height:100%; object-fit:cover;
  background:#141A26;
}
.book-lead-sub{
  font-family:var(--body); font-style:italic; font-weight:300;
  font-size:clamp(1.05rem,.98rem + .4vw,1.32rem);
  color:var(--text-soft);
  margin:0 0 1.9rem; max-width:42ch;
}
.lead-rule{
  border:0; height:2px; width:100%; max-width:34rem;
  margin:0 0 1.9rem;
  background:linear-gradient(to right,
    var(--kumkum) 0%,
    var(--kumkum) 42%,
    rgba(var(--accent-rgb),.5) 70%,
    rgba(var(--accent-rgb),.14) 88%,
    rgba(var(--accent-rgb),0) 100%);
}
.formats{ display:flex; flex-wrap:wrap; gap:.8rem; }
.hero-note{
  font-family:var(--util); font-size:.75rem; color:var(--slate);
  margin:1.6rem 0 0;
}
.hero-note a{
  text-decoration:none; letter-spacing:.04em;
  border-bottom:1px solid rgba(var(--accent-rgb),.45);
  padding-bottom:2px;
  transition:color .25s ease, border-color .25s ease;
}
.hero-note a:hover{ color:var(--kumkum); border-color:var(--kumkum); }

/* ---------- Prose ---------- */

.prose{ max-width:var(--measure); }
.prose p{ margin:0 0 1.35rem; color:var(--text-body); }
.prose p:last-child{ margin-bottom:0; }
.prose .lede{ font-size:1.16em; color:var(--ink); }

/* ---------- Shelf ---------- */

.shelf{
  list-style:none; margin:0; padding:0;
  display:grid; gap:clamp(1.1rem,2.6vw,1.9rem);
  grid-template-columns:repeat(auto-fit,minmax(132px,1fr));
}
.shelf a{
  display:flex; flex-direction:column; gap:.75rem;
  text-decoration:none;
}
.cover-sm{
  position:relative; display:block; overflow:hidden;
  aspect-ratio:2/3;
  background:linear-gradient(168deg,#20283A 0%,#141A26 58%,#0D1119 100%);
  border-radius:1px;
  box-shadow:0 1px 0 rgba(var(--shadow-rgb),.18),
             12px 14px 30px -22px rgba(var(--shadow-rgb),.6);
  transition:transform .35s cubic-bezier(.2,.7,.3,1), box-shadow .35s ease;
}
.cover-sm img{
  position:absolute; inset:0;
  width:100%; height:100%; object-fit:cover;
  background:#141A26;
}
.shelf a:hover .cover-sm{
  transform:translateY(-5px);
  box-shadow:0 1px 0 rgba(var(--shadow-rgb),.18),
             16px 22px 42px -22px rgba(var(--shadow-rgb),.55);
}
.shelf-title{
  font-family:var(--display); font-weight:600;
  font-size:.98rem; line-height:1.2; letter-spacing:-.01em;
  transition:color .25s ease;
}
.shelf a:hover .shelf-title{ color:var(--kumkum); }

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

footer{ border-top:var(--rule); padding-block:2.2rem 3rem; }
.colophon{
  font-family:var(--util); font-size:.72rem; color:var(--slate);
  display:flex; flex-wrap:wrap; gap:.6rem 1.5rem; justify-content:space-between;
}
.colophon-links{ display:flex; flex-wrap:wrap; gap:.6rem 1.5rem; }
.give-back{
  text-decoration:none; letter-spacing:.08em; text-transform:uppercase;
  border-bottom:1px solid rgba(var(--accent-rgb),.45);
  padding-bottom:2px;
  transition:color .25s ease, border-color .25s ease;
}
.give-back:hover{ color:var(--kumkum); border-color:var(--kumkum); }

/* ---------- Reveal ---------- */

.reveal{ opacity:0; transform:translateY(14px); transition:opacity .8s ease, transform .8s cubic-bezier(.2,.7,.3,1); }
.reveal.visible{ opacity:1; transform:none; }

/* ---------- Line breaking ---------- */

h1,h2,h3,
.page-title,.section-title,.shelf-title{ text-wrap:balance; }

p,.book-lead-sub,.section-note{ text-wrap:pretty; }

/* ---------- Responsive ---------- */

@media (max-width:720px){
  .book-lead{ grid-template-columns:1fr; }
  .cover-xl{ max-width:190px; }
  .page-title{ max-width:none; }
}

@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  *{ animation:none !important; transition:none !important; }
  .reveal{ opacity:1; transform:none; }
}

/* ---------- Dark theme ---------- */

html[data-theme="dark"]{
  color-scheme: dark;

  --fog:      #0E1218;
  --fog-deep: #171C24;
  --ink:      #E4E8EC;
  --slate:    #96A1AD;
  --kumkum:   #D2725A;

  --accent-rgb: 210,114,90;
  --scrim:      8,11,16;
  --shadow-rgb: 0,0,0;
  --fog-deep-2: #232B36;
  --text-body:  #C3CAD2;
  --text-soft:  #A8B2BC;
  --text-faint: #7D8896;
  --hairline:        rgba(228,232,236,.14);
  --hairline-strong: rgba(228,232,236,.26);
  --hover-wash:      rgba(228,232,236,.08);
  --card:            rgba(255,255,255,.04);
  --card-hover:      rgba(255,255,255,.075);
  --field-bg:        rgba(255,255,255,.05);
  --field-border:    rgba(228,232,236,.24);
  --glow:            rgba(150,180,214,.10);
  --glow-out:        rgba(150,180,214,0);
  --title-grad: radial-gradient(130% 150% at 18% 14%,
      #FFFFFF 0%, #D6DCE3 30%, #D2725A 68%, #8792A0 100%);
}

/* ---------- Theme toggle ---------- */

.masthead-tools{ display:flex; align-items:center; gap:.35rem; order:3; }
.masthead nav{ order:2; }

.theme-toggle{
  display:none; align-items:center; gap:.5rem;
  height:44px; padding:0 .2rem;
  background:none; border:0; cursor:pointer;
  color:var(--slate);
  font-family:var(--util); font-size:.7rem; font-weight:500;
  letter-spacing:.14em; text-transform:uppercase;
  transition:color .25s ease;
}
.theme-toggle:hover{ color:var(--ink); }
.theme-disc{
  position:relative; display:block;
  width:15px; height:15px; flex:none;
  border:1.5px solid currentColor; border-radius:50%;
  overflow:hidden;
  transition:transform .5s cubic-bezier(.2,.7,.3,1);
}
.theme-disc::after{
  content:""; position:absolute;
  top:-2px; bottom:-2px; left:-2px; width:50%;
  background:currentColor;
}
html[data-theme="dark"] .theme-disc{ transform:rotate(180deg); }
.theme-label{ min-width:3.6em; text-align:left; }

.js .theme-toggle{ display:inline-flex; }

@media (max-width:720px){
  .masthead-tools{ margin-left:auto; }
  .theme-label{ display:none; }
  .theme-toggle{ padding:0; }
}

/* ---------- Prose extras: subheads, lists, contents, pull lines ---------- */

.prose h3{
  font-family:var(--display); font-weight:600;
  font-size:clamp(1.15rem,1.05rem + .5vw,1.45rem);
  line-height:1.2; letter-spacing:-.01em;
  margin:2.7rem 0 1rem;
}
.prose h3:first-child{ margin-top:0; }
.prose em{ font-style:italic; }
.prose strong{ font-weight:400; color:var(--ink); }

.prose ul{ list-style:none; margin:0 0 1.35rem; padding:0; }
.prose ul li{
  position:relative; padding-left:1.6rem;
  margin-bottom:.7rem; color:var(--text-body);
}
.prose ul li::before{
  content:""; position:absolute; left:0; top:.78em;
  width:10px; height:1px; background:var(--kumkum);
}

.prose ol.contents{
  list-style:none; counter-reset:ch;
  margin:0 0 1.35rem; padding:0;
}
.prose ol.contents li{
  counter-increment:ch;
  position:relative; padding:.62rem 0 .62rem 2.6rem;
  border-top:var(--rule); color:var(--text-body);
}
.prose ol.contents li:first-child{ border-top:0; }
.prose ol.contents li::before{
  content:counter(ch,decimal-leading-zero);
  position:absolute; left:0; top:.78rem;
  width:auto; height:auto; background:none;
  font-family:var(--util); font-size:.68rem; letter-spacing:.1em;
  color:var(--slate);
}

.prose .pull{
  font-style:italic; font-size:1.08em;
  color:var(--text-soft);
  border-left:2px solid var(--kumkum);
  padding:.2rem 0 .2rem 1.4rem;
  margin:2.2rem 0 0;
}
.prose .audience{
  font-family:var(--util); font-size:.9rem; line-height:1.6;
  color:var(--slate);
  margin:2rem 0 0;
}