:root{
  --bg:#f5f3ea; --paper:#fffdf7; --ink:#1d241e; --muted:#687069;
  --green:#2d3b2f; --line:#d7d2c4; --shadow:0 8px 28px rgba(24,31,25,.12);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}
.hero{position:relative;height:36vh;min-height:250px;max-height:430px;overflow:hidden;background:#222}
.hero img{width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;inset:0;display:flex;align-items:flex-end;padding:28px 20px;background:linear-gradient(transparent 35%,rgba(0,0,0,.72))}
.hero-overlay div{max-width:1100px;width:100%;margin:auto;color:#fff}
.eyebrow{font-size:.82rem;letter-spacing:.12em;text-transform:uppercase;margin:0 0 5px}
h1{font-size:clamp(2rem,7vw,4.2rem);margin:0;line-height:1}
.hero p:last-child{margin:.45rem 0 0;font-size:1.08rem}
main{max-width:1100px;margin:auto;padding:0 16px 48px}
.intro{text-align:center;padding:28px 8px 20px}
.intro h2{margin:0 0 8px;font-size:1.35rem}
.intro p{margin:5px auto;max-width:720px}
.en{color:var(--muted);font-style:italic}
.group-nav{position:sticky;top:0;z-index:5;display:flex;gap:8px;overflow-x:auto;padding:10px 0 12px;background:rgba(245,243,234,.95);backdrop-filter:blur(8px)}
.group-nav a{flex:0 0 auto;text-decoration:none;color:var(--green);background:var(--paper);border:1px solid var(--line);border-radius:999px;padding:8px 12px;font-size:.8rem;font-weight:700}
.group-section{scroll-margin-top:68px;margin:22px 0 34px}
.group-title{display:flex;align-items:center;gap:12px;margin:0 0 12px}
.group-title h2{font-size:1rem;letter-spacing:.14em;margin:0}
.group-title span{font-size:.78rem;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.card{appearance:none;width:100%;text-align:left;border:0;background:var(--paper);border-radius:14px;overflow:hidden;box-shadow:0 2px 10px rgba(24,31,25,.08);padding:0;color:inherit;cursor:pointer}
.card:active{transform:scale(.99)}
.photo{aspect-ratio:4/3;background:#ddd;position:relative;overflow:hidden}
.photo img{width:100%;height:100%;object-fit:cover;display:block;transition:opacity .2s}
.photo .loading{position:absolute;inset:0;display:grid;place-items:center;font-size:.8rem;color:#606760;padding:12px;text-align:center}
.card-body{padding:10px 11px 12px}
.card-body strong{display:block;font-size:1rem;line-height:1.18}
.card-body em{display:block;color:var(--muted);font-size:.82rem;margin-top:4px;line-height:1.2}
footer{text-align:center;border-top:1px solid var(--line);padding:28px 16px 40px;color:var(--muted)}
footer strong,footer span{display:block}
footer strong{color:var(--ink);margin-bottom:5px}
.modal[hidden]{display:none}
.modal{position:fixed;inset:0;z-index:50}
.modal-backdrop{position:absolute;inset:0;background:rgba(0,0,0,.62)}
.bird-detail{position:absolute;left:0;right:0;bottom:0;max-height:92vh;overflow:auto;background:var(--paper);border-radius:22px 22px 0 0;padding:18px 18px 34px;box-shadow:var(--shadow)}
.close{position:sticky;top:0;float:right;z-index:3;width:40px;height:40px;border:0;border-radius:50%;background:rgba(255,255,255,.92);font-size:1.8rem;line-height:1;cursor:pointer}
.detail-photo{width:100%;max-height:48vh;object-fit:cover;border-radius:16px;background:#ddd}
.detail-head h2{font-size:1.8rem;margin:16px 0 2px}
.detail-head .english{font-size:1rem;color:var(--muted);font-style:italic}
.scientific{font-family:Georgia,serif;font-style:italic;margin:7px 0}
.chips{display:flex;gap:7px;flex-wrap:wrap;margin:12px 0}
.chip{background:#edf0e9;border-radius:999px;padding:7px 10px;font-size:.78rem}
.detail-section{border-top:1px solid var(--line);padding-top:16px;margin-top:16px}
.detail-section h3{font-size:1rem;margin:0 0 7px}
.detail-section p{line-height:1.58;margin:0;color:#343a35}
.source-links{display:flex;gap:9px;flex-wrap:wrap;margin-top:16px}
.source-links a{text-decoration:none;color:white;background:var(--green);border-radius:10px;padding:10px 13px;font-weight:700;font-size:.85rem}
.small-note{color:var(--muted);font-size:.75rem;line-height:1.4;margin-top:14px}
@media(min-width:650px){.grid{grid-template-columns:repeat(3,minmax(0,1fr))}.bird-detail{left:50%;right:auto;bottom:4vh;transform:translateX(-50%);width:min(760px,94vw);border-radius:22px;max-height:92vh}}
@media(min-width:900px){.grid{grid-template-columns:repeat(4,minmax(0,1fr))}}