/* 龟鳖百科 — 全局样式 */
:root {
  --pond: #1b4d3e;
  --pond-deep: #123528;
  --moss: #3e7a5a;
  --sand: #f4ecd8;
  --sand-dark: #e5d9b8;
  --shell: #8a6a3a;
  --shell-light: #c9a86a;
  --ink: #2b2b2b;
  --paper: #fdfbf4;
  --warn: #c0392b;
  --ok: #27ae60;
  --radius: 14px;
  --shadow: 0 4px 18px rgba(27, 77, 62, .14);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  background: linear-gradient(135deg, var(--pond-deep), var(--pond) 60%, var(--moss));
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow);
}
.site-header .bar {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.brand {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: .5px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  text-decoration: none;
}
.site-nav { display: flex; gap: 6px; flex-wrap: wrap; margin-left: auto; }
.site-nav a {
  color: #dcefe4;
  text-decoration: none;
  padding: 7px 14px;
  border-radius: 999px;
  font-size: .95rem;
  transition: background .2s, color .2s;
}
.site-nav a:hover, .site-nav a.active { background: rgba(255,255,255,.16); color: #fff; }

/* ---------- 主容器 ---------- */
main { max-width: 1100px; margin: 0 auto; padding: 28px 20px 60px; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(160deg, var(--pond) 0%, var(--moss) 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 52px 40px;
  margin-bottom: 34px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "🐢";
  position: absolute;
  right: 36px;
  bottom: 18px;
  font-size: 96px;
  opacity: .35;
  transform: rotate(-12deg);
}
.hero h1 { font-size: 2.4rem; margin-bottom: 10px; letter-spacing: 1px; }
.hero p { font-size: 1.08rem; max-width: 620px; opacity: .95; }
.hero .stats { display: flex; gap: 30px; margin-top: 26px; flex-wrap: wrap; }
.hero .stats .num { font-size: 1.9rem; font-weight: 800; }
.hero .stats .lbl { font-size: .88rem; opacity: .85; }

/* ---------- 通用区块 ---------- */
section { margin-bottom: 40px; }
h2.sec-title {
  font-size: 1.5rem;
  color: var(--pond-deep);
  border-left: 6px solid var(--shell);
  padding-left: 14px;
  margin-bottom: 18px;
}
h3 { color: var(--pond); margin: 18px 0 10px; }
p { margin-bottom: 12px; }
a { color: var(--moss); }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 18px; }
.card {
  background: #fff;
  border: 1px solid var(--sand-dark);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  transition: transform .18s, box-shadow .18s;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 10px 26px rgba(27,77,62,.22); }
.card .emoji { font-size: 2.4rem; }
.card h4 { color: var(--pond-deep); font-size: 1.08rem; }
.card .latin { font-style: italic; color: #777; font-size: .86rem; }
.card .tag {
  display: inline-block;
  font-size: .76rem;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--sand);
  color: var(--pond-deep);
  margin-right: 6px;
  margin-top: 4px;
  border: 1px solid var(--sand-dark);
}
.card p { font-size: .9rem; color: #555; margin: 0; flex: 1; }

/* ---------- 信息框 ---------- */
.note {
  border-radius: 10px;
  padding: 14px 18px;
  margin: 14px 0;
  font-size: .95rem;
}
.note.warn { background: #fdecea; border: 1px solid #f5c6c0; color: #7a1f16; }
.note.info { background: #e8f4ee; border: 1px solid #bfe0cf; color: #1d4a36; }

/* ---------- 表格 ---------- */
table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow);
  margin: 14px 0;
}
th, td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--sand-dark); font-size: .93rem; }
th { background: var(--pond); color: #fff; font-weight: 600; }
tr:nth-child(even) td { background: #faf7ee; }

/* ---------- 分类树 ---------- */
.tree { list-style: none; }
.tree > li { margin: 10px 0; padding: 12px 16px; background: #fff; border-radius: 10px; border: 1px solid var(--sand-dark); }
.tree .clade { font-weight: 700; color: var(--pond-deep); }
.tree .kids { list-style: none; margin: 8px 0 0 22px; border-left: 2px dashed var(--shell-light); padding-left: 18px; }
.tree .kids li { margin: 6px 0; font-size: .94rem; }

/* ---------- 筛选器 ---------- */
.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 20px; align-items: center; }
.filter-bar input[type="search"] {
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--sand-dark);
  font-size: .95rem;
  width: 260px;
  background: #fff;
}
.filter-bar .chip {
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid var(--sand-dark);
  background: #fff;
  cursor: pointer;
  font-size: .9rem;
  transition: all .15s;
}
.filter-bar .chip:hover { border-color: var(--moss); }
.filter-bar .chip.active { background: var(--pond); color: #fff; border-color: var(--pond); }
.count-line { font-size: .9rem; color: #666; margin-bottom: 14px; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--pond-deep);
  color: #bcd9c9;
  text-align: center;
  padding: 22px 16px;
  font-size: .88rem;
  margin-top: 20px;
}
.site-footer a { color: #e5f0ea; }

/* ---------- 响应式 ---------- */
@media (max-width: 700px) {
  .hero { padding: 32px 22px; }
  .hero h1 { font-size: 1.7rem; }
  .site-nav { margin-left: 0; width: 100%; justify-content: flex-start; }
  .filter-bar input[type="search"] { width: 100%; }
}