/* Feathered — 田野手册/自然观察笔记风：纸张米白 + 墨绿 + 赭石 + 衬线标题 */
:root {
  --bg: #f5f0e6;
  --panel: #fffdf8;
  --line: #d8cdb8;
  --text: #2b2620;
  --muted: #7a6f5e;
  --primary: #3f5a3a;
  --primary-soft: #e4ebdd;
  --accent: #b8792e;
  --accent-soft: #f3e6d2;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }

/* ---------- 顶栏 ---------- */
.top {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0.85rem clamp(1rem, 4vw, 2.5rem);
  background: rgba(245, 240, 230, 0.92); backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.top__brand { display: flex; align-items: center; gap: 0.5rem; font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; }
.top__mark { color: var(--accent); }
.top__nav { display: flex; align-items: center; gap: 1.1rem; font-size: 0.95rem; }
.top__nav a { color: var(--muted); }
.top__nav a:hover { color: var(--text); }
.top__nav a.is-active { color: var(--primary); font-weight: 600; }
.top__lang { border: 1px solid var(--line); border-radius: 999px; padding: 0.18rem 0.7rem; font-size: 0.8rem; }

/* ---------- hero ---------- */
.hero { max-width: 860px; margin: 0 auto; padding: clamp(2.4rem, 6vw, 4.5rem) 1.25rem 2rem; text-align: center; }
.hero__tag { color: var(--accent); font-style: italic; font-size: 0.95rem; }
.hero__title { font-family: var(--font-display); font-size: clamp(2.1rem, 6vw, 3.4rem); line-height: 1.1; margin: 0.4rem 0 1rem; }
.hero__lead { color: var(--muted); max-width: 560px; margin: 0 auto 1.6rem; }
.hero__cta {
  display: inline-block; background: var(--primary); color: #fff; font-weight: 600;
  padding: 0.65rem 1.5rem; border-radius: 8px; transition: background 0.15s ease, transform 0.15s ease;
}
.hero__cta:hover { background: #34502f; color: #fff; transform: translateY(-1px); }

/* ---------- 区块 ---------- */
.cats, .featured { max-width: 1080px; margin: 0 auto; padding: 1.4rem clamp(1rem, 4vw, 2.5rem) 3rem; }
.sec__h { font-family: var(--font-display); font-size: 1.3rem; margin: 0 0 1.1rem; }
.cats__grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 0.7rem; }
.cat {
  display: flex; align-items: center; justify-content: space-between; gap: 0.5rem;
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 0.75rem 0.9rem;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.cat:hover { border-color: var(--accent); transform: translateY(-1px); }
.cat__name { font-weight: 600; }
.cat__n { color: var(--accent); font-variant-numeric: tabular-nums; }

/* ---------- 卡片 ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 0.9rem; }
.card {
  display: flex; flex-direction: column; overflow: hidden;
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card__thumb img { width: 100%; height: 130px; object-fit: cover; display: block; border-bottom: 1px solid var(--line); }
.card__body { display: flex; flex-direction: column; gap: 0.2rem; padding: 0.85rem 1rem 1rem; }
.card__name { font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; }
.card__sci { font-style: italic; color: var(--muted); font-size: 0.85rem; }
.card__cat { color: var(--accent); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.05em; margin-top: auto; }

/* ---------- 列表页 ---------- */
.list, .detail, .static { max-width: 1080px; margin: 0 auto; padding: 2rem clamp(1rem, 4vw, 2.5rem) 4rem; }
.list__title { font-family: var(--font-display); font-size: clamp(1.8rem, 4vw, 2.4rem); margin: 0 0 0.5rem; }
.list__intro { color: var(--muted); max-width: 640px; margin: 0 0 2rem; }
.group { margin-bottom: 2.5rem; }
.group__h { font-family: var(--font-display); font-size: 1.2rem; margin: 0 0 1rem; display: flex; align-items: center; gap: 0.5rem; }
.group__n { color: var(--accent); font-family: var(--font-body); font-size: 0.9rem; }

/* ---------- 详情页 ---------- */
.crumbs { color: var(--muted); font-size: 0.88rem; margin-bottom: 1.4rem; }
.crumbs a:hover { color: var(--text); }
.bird { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: clamp(1.3rem, 4vw, 2.2rem); }
.bird__top { display: grid; grid-template-columns: 220px 1fr; gap: 1.5rem; align-items: center; margin-bottom: 1.4rem; }
@media (max-width: 640px) { .bird__top { grid-template-columns: 1fr; } }
.bird__fig { margin: 0; }
.bird__fig img { width: 100%; border: 1px solid var(--line); border-radius: 12px; background: var(--bg); }
.bird__cat { display: inline-block; background: var(--primary-soft); color: var(--primary); font-size: 0.78rem; padding: 0.22rem 0.65rem; border-radius: 999px; text-transform: uppercase; letter-spacing: 0.05em; }
.bird__name { font-family: var(--font-display); font-size: clamp(1.7rem, 4vw, 2.4rem); margin: 0.5rem 0 0.2rem; line-height: 1.15; }
.bird__sci { font-style: italic; color: var(--muted); margin: 0 0 0.2rem; }
.bird__alt { color: var(--accent); margin: 0; }
.facts { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 0.4rem 1.2rem; margin: 0 0 1.6rem; padding: 1rem 1.1rem; background: var(--bg); border: 1px solid var(--line); border-radius: 10px; }
.facts__k { font-size: 0.78rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.facts__v { margin: 0 0 0.5rem; font-weight: 500; }
.desc__h { font-family: var(--font-display); font-size: 1.15rem; margin: 0 0 0.7rem; }
.desc__p { margin: 0 0 0.9rem; }
.voice { margin-top: 1.4rem; padding: 1rem 1.1rem; background: var(--accent-soft); border-left: 3px solid var(--accent); border-radius: 8px; }
.voice__text { margin: 0; font-style: italic; }
.similar { margin-top: 2.4rem; }
.similar__h { font-family: var(--font-display); font-size: 1.15rem; margin: 0 0 1rem; }

/* ---------- 静态页 ---------- */
.static__title { font-family: var(--font-display); font-size: clamp(1.8rem, 4vw, 2.4rem); margin: 0 0 1rem; }
.static__body { max-width: 680px; }
.static__body a { color: var(--accent); }

/* ---------- 页脚 ---------- */
.foot { border-top: 1px solid var(--line); padding: 2rem clamp(1rem, 4vw, 2.5rem) 3rem; text-align: center; }
.foot__brand { color: var(--muted); font-style: italic; }
.foot__links a { color: var(--muted); margin: 0 0.2rem; }
.foot__links a:hover { color: var(--text); }