/* =========================================================
   BookNest -- Design Tokens
   ========================================================= */
:root{
  --ink: #1B2430;
  --ink-2: #232E3D;
  --ink-3: #2C3A4C;
  --oxblood: #7A2E2E;
  --oxblood-light: #9C4A3F;
  --brass: #C9A24B;
  --brass-light: #DDBE73;
  --sage: #4F6D5A;
  --parchment: #F4EFE4;
  --parchment-2: #EAE2D0;
  --parchment-3: #DED2B4;
  --charcoal: #2A2A28;
  --charcoal-soft: #55524A;
  --cream-text: #EDE7D9;
  --cream-text-dim: #B9B2A0;

  --font-display: "Fraunces", "Iowan Old Style", "Palatino Linotype", serif;
  --font-body: "Newsreader", "Georgia", serif;
  --font-ui: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --radius-s: 6px;
  --radius-m: 12px;
  --radius-l: 20px;

  --shadow-card: 0 1px 2px rgba(27,36,48,.06), 0 8px 24px rgba(27,36,48,.08);
  --shadow-lift: 0 4px 8px rgba(27,36,48,.10), 0 20px 40px rgba(27,36,48,.14);

  --max-w: 1200px;

  /* ---- Semantic theme tokens (LIGHT default) ---- */
  --bg: var(--parchment);
  --bg-alt: var(--parchment-2);
  --surface: #ffffff;
  --surface-2: var(--parchment-2);
  --text-primary: var(--charcoal);
  --text-secondary: var(--charcoal-soft);
  --border: var(--parchment-3);
  --input-bg: #ffffff;
}

[data-theme="dark"]{
  --bg: #171E28;
  --bg-alt: #1C2530;
  --surface: var(--ink-2);
  --surface-2: var(--ink-3);
  --text-primary: var(--cream-text);
  --text-secondary: var(--cream-text-dim);
  --border: rgba(237,231,217,.14);
  --input-bg: var(--ink-3);
  --shadow-card: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  --shadow-lift: 0 4px 10px rgba(0,0,0,.35), 0 20px 44px rgba(0,0,0,.45);
}

@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-ui);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background .25s ease, color .25s ease;
}
img{ max-width:100%; display:block; }
a{ color: inherit; text-decoration: none; }
h1,h2,h3,h4{ font-family: var(--font-display); font-weight: 700; margin: 0 0 .5em; letter-spacing: -0.01em; color: var(--text-primary); }
p{ margin: 0 0 1em; }
ul{ margin:0; padding:0; list-style:none; }
button{ font-family: inherit; cursor:pointer; }
input, select, textarea{ font-family: var(--font-ui); }

.container{ max-width: var(--max-w); margin: 0 auto; padding: 0 28px; }

:focus-visible{
  outline: 2px solid var(--brass);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link{
  position:absolute; left:-999px; top:0; background:var(--ink); color:var(--cream-text);
  padding:10px 16px; z-index:1000; border-radius: 0 0 8px 0;
}
.skip-link:focus{ left:0; }

/* =========================================================
   Header / Nav (always dark ink -- brand shelf, both themes)
   ========================================================= */
.site-header{
  background: var(--ink);
  color: var(--cream-text);
  position: sticky; top:0; z-index:100;
  border-bottom: 1px solid rgba(237,231,217,.08);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding: 16px 28px;
  max-width: var(--max-w); margin:0 auto;
  gap: 14px;
}
.brand{
  display:flex; align-items:center; gap:10px;
  font-family: var(--font-display); font-weight:700; font-size:1.35rem;
  color: var(--cream-text);
}
.brand-mark{ width:30px; height:30px; flex-shrink:0; }
.brand-tag{
  display:block; font-family: var(--font-ui); font-weight: 500; font-size:.62rem;
  letter-spacing:.14em; text-transform:uppercase; color: var(--brass-light); margin-top:1px;
}
.nav-links{
  display:flex; align-items:center; gap: 26px;
  font-size:.95rem; font-weight:500;
}
.nav-links a{
  color: var(--cream-text-dim);
  position:relative; padding: 6px 0;
  transition: color .2s ease;
}
.nav-links a:hover, .nav-links a[aria-current="page"]{ color: var(--cream-text); }
.nav-links a[aria-current="page"]::after{
  content:""; position:absolute; left:0; right:0; bottom:0; height:2px; background: var(--brass);
  border-radius: 2px;
}
.nav-actions{ display:flex; align-items:center; gap:10px; }
.nav-toggle{
  display:none; background:none; border:1px solid rgba(237,231,217,.25); color:var(--cream-text);
  border-radius: var(--radius-s); padding:8px 10px;
}
.theme-toggle{
  width:38px; height:38px; border-radius:50%; border:1px solid rgba(237,231,217,.25);
  background: rgba(237,231,217,.06); color: var(--cream-text); font-size:1rem;
  display:flex; align-items:center; justify-content:center; flex-shrink:0;
  transition: background .2s ease, transform .2s ease;
}
.theme-toggle:hover{ background: rgba(237,231,217,.16); transform: rotate(12deg); }

/* Buttons */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding: 11px 22px; border-radius: 999px; font-weight:600; font-size:.92rem;
  border:1px solid transparent; transition: transform .15s ease, box-shadow .15s ease, background .2s ease, color .2s ease;
  white-space:nowrap;
}
.btn:active{ transform: translateY(1px); }
.btn-primary{ background: var(--oxblood); color: var(--cream-text); }
.btn-primary:hover{ background: var(--oxblood-light); box-shadow: var(--shadow-card); }
.btn-ghost{ background: transparent; color: var(--cream-text); border-color: rgba(237,231,217,.3); }
.btn-ghost:hover{ background: rgba(237,231,217,.08); }
.btn-brass{ background: var(--brass); color: var(--ink); }
.btn-brass:hover{ background: var(--brass-light); box-shadow: var(--shadow-card); }
.btn-outline{ background:transparent; border-color: var(--text-primary); color: var(--text-primary); }
.btn-outline:hover{ background: var(--text-primary); color: var(--bg); }
.btn-sm{ padding: 7px 16px; font-size:.82rem; }
.btn-block{ width:100%; }
.btn:disabled{ opacity:.5; cursor:not-allowed; }

/* =========================================================
   Hero / Bookshelf signature element (home)
   ========================================================= */
.hero{
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--cream-text);
  padding: 56px 0 0;
  position:relative;
  overflow:hidden;
}
.hero-grid{
  display:grid; grid-template-columns: 1.05fr .95fr; gap:48px; align-items:center;
  padding-bottom: 40px;
}
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-size:.72rem; letter-spacing:.16em; text-transform:uppercase; font-weight:600;
  color: var(--brass-light); margin-bottom: 18px;
}
.eyebrow::before{ content:""; width:26px; height:1px; background: var(--brass-light); }
.hero h1{
  font-size: clamp(2.4rem, 5vw, 4.1rem); color: var(--cream-text); line-height:1.04; margin-bottom:.4em;
}
.hero h1 em{ font-style: italic; color: var(--brass-light); }
.hero-sub{
  font-family: var(--font-body); font-size: 1.15rem; color: var(--cream-text-dim);
  max-width: 46ch; margin-bottom: 2em; line-height:1.55;
}
.hero-ctas{ display:flex; gap:14px; flex-wrap:wrap; margin-bottom: 2.4em; }
.hero-stats{ display:flex; gap:34px; flex-wrap:wrap; }
.hero-stat b{ display:block; font-family: var(--font-display); font-size:1.6rem; color: var(--brass-light); }
.hero-stat span{ font-size:.8rem; color: var(--cream-text-dim); }

/* Bookshelf interactive */
.shelf-wrap{ position:relative; }
.shelf-stage{
  background: var(--ink-3);
  border-radius: var(--radius-l);
  padding: 26px 26px 0;
  box-shadow: var(--shadow-lift);
  min-height: 360px;
  display:flex; flex-direction:column; justify-content:flex-end;
}
.shelf-preview{
  flex:1; display:flex; align-items:center; gap:20px; padding: 6px 4px 22px;
  min-height: 190px;
}
.shelf-preview-cover{
  width: 108px; height:156px; border-radius: 4px 8px 8px 4px; flex-shrink:0;
  box-shadow: 0 10px 24px rgba(0,0,0,.35);
  display:flex; align-items:flex-end; padding:10px; position:relative;
  transition: transform .25s ease;
}
.shelf-preview-cover::before{
  content:""; position:absolute; left:0; top:0; bottom:0; width:8px;
  background: rgba(0,0,0,.18);
}
.shelf-preview-title{ font-family:var(--font-display); font-weight:700; font-size:.9rem; color:#fff; line-height:1.15; }
.shelf-preview-info{ min-width:0; }
.shelf-preview-genre{ font-size:.68rem; text-transform:uppercase; letter-spacing:.12em; color: var(--brass-light); font-weight:600; }
.shelf-preview-info h3{ color:#fff; font-size:1.3rem; margin: .2em 0 .15em; }
.shelf-preview-info .author{ font-family: var(--font-body); font-style:italic; color: var(--cream-text-dim); margin-bottom:.5em; }
.shelf-preview-info p{ font-family: var(--font-body); color: var(--cream-text-dim); font-size:.92rem; max-width: 40ch; margin-bottom:.8em; }

.shelf-rail{
  display:flex; gap:6px; padding: 4px 0 22px; overflow-x:auto; scrollbar-width:none;
  border-top: 1px solid rgba(237,231,217,.08); margin-top:6px; padding-top:16px;
}
.shelf-rail::-webkit-scrollbar{ display:none; }
.spine{
  border:none; border-radius: 4px 4px 2px 2px; flex-shrink:0;
  width: 34px; height: 128px; cursor:pointer;
  writing-mode: vertical-rl; text-orientation: mixed;
  color: rgba(255,255,255,.92); font-family: var(--font-display); font-weight:700; font-size:.68rem;
  padding: 10px 0 8px; display:flex; align-items:flex-start; justify-content:center;
  transition: transform .18s ease, height .18s ease, box-shadow .18s ease;
  box-shadow: inset -3px 0 6px rgba(0,0,0,.18);
}
.spine:hover{ transform: translateY(-8px); }
.spine[aria-pressed="true"]{ height:150px; box-shadow: 0 10px 18px rgba(0,0,0,.35), inset -3px 0 6px rgba(0,0,0,.18); }

/* =========================================================
   Sections (generic)
   ========================================================= */
.section{ padding: 74px 0; }
.section-tight{ padding: 44px 0; }
.section-alt{ background: var(--bg-alt); }
.section-dark{ background: var(--ink); color: var(--cream-text); }
.section-head{ display:flex; align-items:flex-end; justify-content:space-between; gap:20px; margin-bottom:36px; flex-wrap:wrap; }
.section-head h2{ font-size: clamp(1.7rem, 3vw, 2.5rem); margin-bottom:.2em; }
.section-head p{ font-family: var(--font-body); color: var(--text-secondary); font-size:1.05rem; max-width:56ch; }
.section-dark .section-head p{ color: var(--cream-text-dim); }
.eyebrow-light{ color: var(--oxblood); }
[data-theme="dark"] .eyebrow-light{ color: var(--brass-light); }
.section-dark .eyebrow{ color: var(--brass-light); }

/* =========================================================
   Book Cards
   ========================================================= */
.book-grid{
  display:grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap:26px;
}
.book-card{
  background: var(--surface); border-radius: var(--radius-m); overflow:hidden;
  box-shadow: var(--shadow-card); transition: transform .2s ease, box-shadow .2s ease;
  display:flex; flex-direction:column; height:100%;
}
.book-card:hover{ transform: translateY(-5px); box-shadow: var(--shadow-lift); }
.cover{
  aspect-ratio: 3/4.4; position:relative; display:flex; flex-direction:column; justify-content:flex-end;
  padding: 16px; overflow:hidden;
}
.cover::after{ content:""; position:absolute; inset:0; background: linear-gradient(180deg, rgba(0,0,0,0) 45%, rgba(0,0,0,.45) 100%); }
.cover-genre{ position:relative; z-index:1; font-size:.6rem; text-transform:uppercase; letter-spacing:.1em; font-weight:700; color:rgba(255,255,255,.85); margin-bottom:6px; }
.cover-title{ position:relative; z-index:1; font-family: var(--font-display); font-weight:700; color:#fff; font-size:1.05rem; line-height:1.18; }
.cover-author-tag{ position:relative; z-index:1; font-family: var(--font-body); font-style:italic; color:rgba(255,255,255,.78); font-size:.78rem; margin-top:4px; }
.card-body{ padding: 14px 16px 18px; display:flex; flex-direction:column; gap:6px; flex:1; }
.card-author{ font-family: var(--font-body); font-style:italic; color: var(--text-secondary); font-size:.88rem; }
.card-meta{ display:flex; align-items:center; justify-content:space-between; margin-top:auto; padding-top:8px; }
.rating{ display:flex; align-items:center; gap:4px; font-size:.8rem; color: var(--brass); font-weight:700; }
.rating .stars{ letter-spacing:1px; }
.tag{
  display:inline-block; font-size:.68rem; font-weight:600; text-transform:uppercase; letter-spacing:.06em;
  padding: 3px 9px; border-radius:999px; background: var(--sage); color:#fff;
}
.progress-chip{ font-size:.72rem; color: var(--oxblood-light); font-weight:600; }
[data-theme="dark"] .progress-chip{ color: var(--brass-light); }

/* Carousel (featured books) */
.carousel{ position:relative; }
.carousel-track{
  display:flex; gap:22px; overflow-x:auto; scroll-snap-type: x mandatory; padding: 6px 2px 20px;
  scrollbar-width: thin; scrollbar-color: var(--oxblood) transparent;
}
.carousel-track .book-card{ min-width: 220px; scroll-snap-align:start; }
.carousel-nav{ display:flex; gap:10px; }
.carousel-btn{
  width:40px; height:40px; border-radius:50%; border:1px solid var(--border);
  background: var(--surface); display:flex; align-items:center; justify-content:center; font-size:1.1rem;
  transition: background .2s ease, transform .15s ease, color .2s ease; color: var(--text-primary);
}
.carousel-btn:hover{ background: var(--oxblood); color:#fff; transform: translateY(-2px); }

/* =========================================================
   Category tiles
   ========================================================= */
.cat-grid{ display:grid; grid-template-columns: repeat(auto-fill, minmax(200px,1fr)); gap:18px; }
.cat-tile{
  display:flex; flex-direction:column; gap:6px; padding:24px 22px;
  border-radius: var(--radius-m); color:#fff; min-height:128px; justify-content:flex-end;
  transition: transform .2s ease;
  box-shadow: var(--shadow-card);
}
.cat-tile:hover{ transform: translateY(-4px); }
.cat-tile h3{ color:#fff; font-size:1.2rem; margin:0; }
.cat-tile span{ font-size:.78rem; opacity:.85; font-weight:500; }

/* =========================================================
   Forms
   ========================================================= */
.field{ margin-bottom: 18px; text-align:left; }
.field label{ display:block; font-size:.82rem; font-weight:600; margin-bottom:6px; color: var(--text-primary); }
.field input, .field select, .field textarea{
  width:100%; padding: 12px 14px; border-radius: var(--radius-s); border: 1px solid var(--border);
  background: var(--input-bg); font-size:.95rem; color: var(--text-primary);
  transition: border-color .2s ease, box-shadow .2s ease;
}
.field input:focus, .field select:focus, .field textarea:focus{
  border-color: var(--oxblood); box-shadow: 0 0 0 3px rgba(122,46,46,.16); outline:none;
}
.field-hint{ font-size:.76rem; color: var(--text-secondary); margin-top:4px; }
.field-error{ font-size:.76rem; color: var(--oxblood-light); margin-top:4px; display:none; }
.field.has-error input{ border-color: var(--oxblood-light); }
.field.has-error .field-error{ display:block; }
.checkbox-row{ display:flex; align-items:center; gap:8px; font-size:.86rem; }
.checkbox-row input{ width:auto; }

/* =========================================================
   Footer
   ========================================================= */
.site-footer{ background: var(--ink); color: var(--cream-text-dim); padding: 56px 0 26px; }
.footer-grid{ display:grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap:36px; margin-bottom:40px; }
.footer-grid h4{ color: var(--cream-text); font-size:.85rem; text-transform:uppercase; letter-spacing:.08em; margin-bottom:14px; font-family: var(--font-ui); }
.footer-grid ul li{ margin-bottom:9px; font-size:.9rem; }
.footer-grid ul a:hover{ color: var(--cream-text); }
.footer-brand p{ font-family: var(--font-body); max-width:32ch; color:var(--cream-text-dim); }
.footer-bottom{ display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px; padding-top:22px; border-top:1px solid rgba(237,231,217,.1); font-size:.8rem; }

/* =========================================================
   Utility
   ========================================================= */
.text-center{ text-align:center; }
.mt-0{ margin-top:0; }
.visually-hidden{
  position:absolute !important; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden;
  clip:rect(0,0,0,0); white-space:nowrap; border:0;
}
.divider{ height:1px; background: var(--border); border:none; margin: 40px 0; }
.badge-new{ background:var(--brass); color:var(--ink); font-size:.65rem; font-weight:700; text-transform:uppercase; padding:3px 8px; border-radius:999px; letter-spacing:.05em; }
.empty-state{ text-align:center; padding: 60px 20px; color: var(--text-secondary); font-family: var(--font-body); }
.empty-state h3{ margin-bottom:.3em; }
.toast{
  position:fixed; bottom:24px; left:50%; transform: translateX(-50%) translateY(20px);
  background: var(--ink); color: var(--cream-text); padding: 13px 22px; border-radius: 999px;
  font-size:.88rem; font-weight:600; box-shadow: var(--shadow-lift); z-index:1000; opacity:0;
  pointer-events:none; transition: opacity .25s ease, transform .25s ease;
}
.toast.show{ opacity:1; transform: translateX(-50%) translateY(0); }

.breadcrumb{ font-size:.82rem; color: var(--text-secondary); margin-bottom: 20px; }
.breadcrumb a:hover{ color: var(--oxblood-light); text-decoration:underline; }

.pd-badge{ display:inline-flex; align-items:center; gap:5px; font-size:.68rem; font-weight:700; text-transform:uppercase; letter-spacing:.06em; padding:3px 9px; border-radius:999px; }
.pd-badge.free{ background: var(--sage); color:#fff; }
.pd-badge.locked{ background: rgba(122,46,46,.15); color: var(--oxblood-light); border:1px solid rgba(122,46,46,.3); }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 900px){
  .hero-grid{ grid-template-columns: 1fr; }
  .footer-grid{ grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px){
  .nav-links{
    position:absolute; top:100%; left:0; right:0; background: var(--ink);
    flex-direction:column; align-items:flex-start; gap:2px; padding: 8px 28px 20px;
    display:none; border-bottom:1px solid rgba(237,231,217,.08);
  }
  .nav-links.open{ display:flex; }
  .nav-links a{ width:100%; padding:12px 0; }
  .nav-toggle{ display:inline-flex; }
  .nav-actions .btn-ghost span, .nav-actions .btn-primary span{ display:none; }
  .footer-grid{ grid-template-columns: 1fr; }
  .shelf-preview{ flex-direction:column; align-items:flex-start; text-align:left; }
  .container{ padding: 0 18px; }
  .section{ padding: 48px 0; }
  .hero{ padding-top: 32px; }
  .hero-stats{ gap:20px; }
  .book-grid{ grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap:16px; }
}
@media (max-width: 420px){
  .book-grid{ grid-template-columns: repeat(2, 1fr); }
  .hero-ctas .btn span{ display:inline; }
}

/* =========================================================
   Reading Mode (book.html) -- distraction-free overlay state
   ========================================================= */
body.reading-mode .site-header,
body.reading-mode .site-footer,
body.reading-mode .book-hero,
body.reading-mode .reading-mode-hide{
  display: none !important;
}
body.reading-mode .reader-shell{
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 20px 60px;
}
body.reading-mode{
  background: var(--reading-bg, var(--bg));
}
.reading-mode-bar{
  display:none;
  position: sticky; top:0; z-index: 50;
  background: var(--ink); color: var(--cream-text);
  padding: 12px 20px; align-items:center; justify-content:space-between;
  gap: 12px;
}
body.reading-mode .reading-mode-bar{ display:flex; }
.reading-mode-bar span{ font-family: var(--font-display); font-weight:600; font-size:.92rem; }