:root{
  --ink:#16241C;
  --ink-soft:#3C4A3F;
  --paper:#F4F1E6;
  --paper-card:#FCFAF3;
  --amber:#C98A2B;
  --amber-dark:#9C6A1D;
  --line:#DAD4C0;
  --radius:14px;
  --shadow: 0 10px 30px -14px rgba(22,36,28,0.35);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Inter', system-ui, sans-serif;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}

.wrap{max-width:1180px;margin:0 auto;padding:0 24px;}

/* ---------- NAV ---------- */
.nav{
  position:sticky; top:0; z-index:40;
  background:var(--ink);
  color:var(--paper);
  border-bottom:3px solid var(--amber);
}
.nav-inner{
  max-width:1180px;margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;gap:20px;justify-content:space-between;
  flex-wrap:wrap;
}
.brand-logo{
  font-family:'Fraunces', serif;
  font-weight:600; font-size:1.35rem; letter-spacing:.2px;
  display:flex; align-items:baseline; gap:8px;
}
.brand-logo small{
  font-family:'Inter',sans-serif; font-weight:500; font-size:.68rem;
  letter-spacing:2.5px; text-transform:uppercase; color:var(--amber);
}
.search-box{
  flex:1 1 260px; max-width:420px; position:relative;
}
.search-box input{
  width:100%; padding:10px 16px 10px 38px; border-radius:999px; border:none;
  background:rgba(244,241,230,0.12); color:var(--paper);
  font-family:'Inter',sans-serif; font-size:.92rem; outline:none;
  border:1px solid rgba(244,241,230,0.25);
  transition:background .2s, border-color .2s;
}
.search-box input::placeholder{color:rgba(244,241,230,0.55);}
.search-box input:focus{background:rgba(244,241,230,0.18); border-color:var(--amber);}
.search-box svg{position:absolute; left:12px; top:50%; transform:translateY(-50%); opacity:.6;}

/* ---------- HERO ---------- */
.hero{
  padding:64px 0 40px;
  border-bottom:1px solid var(--line);
  background:
    repeating-linear-gradient(to bottom, transparent 0 39px, var(--line) 39px 40px) ;
  background-size:100% 40px;
  background-position:0 90px;
}
.hero .eyebrow{
  font-size:.72rem; letter-spacing:3px; text-transform:uppercase;
  color:var(--amber-dark); font-weight:700; margin:0 0 14px;
}
.hero h1{
  font-family:'Fraunces', serif; font-weight:600;
  font-size:clamp(2.1rem, 4.4vw, 3.4rem);
  line-height:1.05; margin:0 0 18px; max-width:780px;
}
.hero h1 em{font-style:italic; color:var(--amber-dark);}
.hero p{
  max-width:560px; font-size:1.05rem; line-height:1.6; color:var(--ink-soft);
  margin:0 0 8px;
}
.hero .stat-row{
  display:flex; gap:28px; margin-top:28px; flex-wrap:wrap;
}
.stat{min-width:100px;}
.stat b{
  font-family:'Fraunces',serif; font-size:1.9rem; display:block; line-height:1;
}
.stat span{font-size:.78rem; color:var(--ink-soft); text-transform:uppercase; letter-spacing:1px;}

/* ---------- SPECIES FILTER ---------- */
.filters{
  padding:26px 0 10px; display:flex; gap:10px; flex-wrap:wrap; align-items:center;
}
.filters .flabel{font-size:.78rem; text-transform:uppercase; letter-spacing:1.5px; color:var(--ink-soft); margin-right:6px;}
.chip{
  border:1px solid var(--line); background:var(--paper-card); color:var(--ink-soft);
  padding:6px 14px; border-radius:999px; font-size:.82rem; cursor:pointer;
  transition:all .15s; font-family:'Inter',sans-serif;
}
.chip:hover{border-color:var(--amber);}
.chip.active{background:var(--ink); color:var(--paper); border-color:var(--ink);}

/* ---------- GRID ---------- */
.grid{
  display:grid; grid-template-columns:repeat(auto-fill, minmax(255px,1fr));
  gap:26px; padding:22px 0 70px;
}
.card{
  background:var(--paper-card);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:var(--shadow);
  border:1px solid var(--line);
  cursor:pointer;
  position:relative;
  transition:transform .18s ease, box-shadow .18s ease;
  display:flex; flex-direction:column;
}
.card:hover{transform:translateY(-4px); box-shadow:0 18px 34px -14px rgba(22,36,28,0.45);}
.card:focus-visible{outline:3px solid var(--amber); outline-offset:2px;}

.card .tab{
  height:6px; width:100%;
}
.card .cover{
  position:relative; aspect-ratio:4/3; overflow:hidden;
  background:#eee;
}
.card .cover img{width:100%; height:100%; object-fit:cover; object-position:top;}
.card .holes{
  position:absolute; left:10px; top:14px; display:flex; flex-direction:column; gap:8px; z-index:2;
}
.card .holes span{
  width:9px; height:9px; border-radius:50%; background:var(--paper);
  box-shadow:0 0 0 2px rgba(0,0,0,0.06) inset;
}
.card .body{padding:16px 18px 18px; flex:1; display:flex; flex-direction:column;}
.card h3{
  font-family:'Fraunces',serif; font-size:1.18rem; margin:0 0 4px; font-weight:600;
}
.card .lema{font-size:.83rem; color:var(--ink-soft); margin:0 0 12px; line-height:1.4; min-height:2.6em;}
.card .species{
  display:flex; flex-wrap:wrap; gap:6px; margin-top:auto; margin-bottom:12px;
}
.card .species span{
  font-size:.68rem; padding:3px 9px; border-radius:999px; background:var(--paper);
  border:1px solid var(--line); color:var(--ink-soft);
}
.card .cta{
  display:flex; align-items:center; justify-content:space-between;
  font-size:.82rem; font-weight:600; color:var(--ink);
  border-top:1px dashed var(--line); padding-top:12px;
}
.card .cta .pages{color:var(--ink-soft); font-weight:400;}

.empty-state{
  padding:60px 20px; text-align:center; color:var(--ink-soft); display:none;
}
.empty-state.show{display:block;}

/* ---------- FOOTER ---------- */
footer{
  background:var(--ink); color:rgba(244,241,230,0.75);
  padding:36px 0; font-size:.85rem;
}
footer .wrap{display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px;}
footer b{color:var(--paper);}

/* ---------- READER ---------- */
.reader{
  position:fixed; inset:0; background:var(--ink);
  z-index:100; display:none; flex-direction:column;
}
.reader.open{display:flex;}
.reader-top{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 20px; color:var(--paper);
  border-bottom:1px solid rgba(244,241,230,0.15);
  flex-wrap:wrap; gap:10px;
}
.reader-top .rt-left{display:flex; align-items:center; gap:14px;}
.back-btn{
  background:none; border:1px solid rgba(244,241,230,0.3); color:var(--paper);
  padding:8px 14px; border-radius:999px; cursor:pointer; font-family:'Inter',sans-serif;
  font-size:.85rem; display:flex; align-items:center; gap:6px;
}
.back-btn:hover{border-color:var(--amber);}
.reader-title{font-family:'Fraunces',serif; font-size:1.15rem;}
.reader-title small{display:block; font-family:'Inter',sans-serif; font-size:.72rem; color:rgba(244,241,230,0.6); font-weight:400;}
.download-btn{
  background:var(--amber); color:var(--ink); border:none; padding:9px 18px;
  border-radius:999px; font-weight:700; font-size:.85rem; cursor:pointer;
  text-decoration:none; display:inline-flex; align-items:center; gap:6px;
}
.download-btn:hover{background:var(--amber-dark); color:var(--paper);}

.reader-stage{
  flex:1; display:flex; align-items:center; justify-content:center; position:relative;
  overflow:hidden; padding:10px;
}
.reader-stage img{
  max-height:100%; max-width:100%; object-fit:contain; border-radius:6px;
  box-shadow:0 20px 60px rgba(0,0,0,0.5);
  user-select:none;
}
.nav-arrow{
  position:absolute; top:50%; transform:translateY(-50%);
  background:rgba(244,241,230,0.1); border:1px solid rgba(244,241,230,0.25);
  color:var(--paper); width:46px; height:46px; border-radius:50%;
  display:flex; align-items:center; justify-content:center; cursor:pointer; font-size:1.3rem;
}
.nav-arrow:hover{background:var(--amber); color:var(--ink); border-color:var(--amber);}
.nav-arrow.prev{left:16px;} .nav-arrow.next{right:16px;}
.nav-arrow[disabled]{opacity:.25; cursor:default; pointer-events:none;}

.reader-stage iframe{
  width:100%; height:100%; border:none; border-radius:6px; background:#fff;
  box-shadow:0 20px 60px rgba(0,0,0,0.5);
}
.reader-bottom{padding:12px 20px 18px;}
.reader-bottom.hidden{display:none;}

.card .cover .drive-fallback{
  width:100%; height:100%; display:flex; align-items:center; justify-content:center;
  font-family:'Fraunces',serif; font-weight:700; font-size:2.6rem; color:#fff;
}
.badge-cloud{
  position:absolute; right:10px; top:10px; z-index:2;
  background:rgba(22,36,28,0.75); color:var(--paper); font-size:.62rem;
  letter-spacing:1px; text-transform:uppercase; padding:3px 8px; border-radius:999px;
  font-weight:700;
}
.progress-track{
  height:3px; background:rgba(244,241,230,0.15); border-radius:3px; overflow:hidden; margin-bottom:12px;
}
.progress-fill{height:100%; background:var(--amber); transition:width .2s;}
.thumbstrip{
  display:flex; gap:8px; overflow-x:auto; padding-bottom:4px;
}
.thumbstrip img{
  height:58px; border-radius:4px; opacity:.45; cursor:pointer; border:2px solid transparent;
  transition:opacity .15s, border-color .15s; flex-shrink:0;
}
.thumbstrip img.active{opacity:1; border-color:var(--amber);}
.thumbstrip img:hover{opacity:.85;}

@media (max-width: 640px){
  .hero{padding:40px 0 28px;}
  .reader-top{padding:12px 14px;}
  .nav-arrow{width:38px; height:38px;}
}