/* ============ 科学喂量指南 全站样式（移动优先） ============ */
:root {
  --brand: #0e7c66;
  --brand-dark: #0a5c4c;
  --brand-light: #e6f4f1;
  --accent: #e8763a;
  --accent-light: #fdf0e7;
  --dog: #0e7c66;
  --cat: #8256b0;
  --ink: #26302e;
  --ink-soft: #5a6663;
  --paper: #ffffff;
  --bg: #f6f8f7;
  --line: #dde5e3;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(14, 124, 102, .08);
  --maxw: 1080px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}
img { max-width: 100%; height: auto; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.35; color: var(--ink); }
h1 { font-size: 1.6rem; margin: 0 0 .6em; }
h2 { font-size: 1.3rem; margin: 1.6em 0 .6em; }
h3 { font-size: 1.1rem; margin: 1.3em 0 .5em; }
p { margin: 0 0 1em; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }

/* ---------- 页头 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 1.05rem; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 9px; flex: none;
  background: var(--brand); color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 1.05rem;
}
.nav-desktop { display: none; }
.nav-desktop ul { display: flex; gap: 22px; list-style: none; margin: 0; padding: 0; }
.nav-desktop a { color: var(--ink-soft); font-weight: 500; padding: 6px 2px; }
.nav-desktop a:hover { color: var(--brand); text-decoration: none; }
.nav-desktop a.active { color: var(--brand); border-bottom: 2px solid var(--brand); }

.menu-btn {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 44px; height: 44px; padding: 10px;
  background: none; border: 1px solid var(--line); border-radius: 10px; cursor: pointer;
}
.menu-btn span { display: block; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .2s, opacity .2s; }
.menu-btn[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-btn[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-mobile {
  display: none;
  background: var(--paper);
  border-top: 1px solid var(--line);
}
.nav-mobile.open { display: block; }
.nav-mobile ul { list-style: none; margin: 0; padding: 8px 16px 16px; }
.nav-mobile li { border-bottom: 1px solid var(--bg); }
.nav-mobile a { display: block; padding: 13px 4px; font-weight: 500; color: var(--ink); }
.nav-mobile a.active { color: var(--brand); }

@media (min-width: 860px) {
  h1 { font-size: 2rem; }
  .nav-desktop { display: block; }
  .menu-btn { display: none; }
  .nav-mobile { display: none !important; }
}

/* ---------- 主体 ---------- */
main { min-height: 60vh; padding-bottom: 48px; }
.page { background: var(--paper); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px 20px; margin-top: 24px; }
@media (min-width: 860px) { .page { padding: 40px 48px; } }

.lede { font-size: 1.05rem; color: var(--ink-soft); }
.updated { font-size: .85rem; color: var(--ink-soft); margin-bottom: 1.2em; }

/* ---------- 按钮 / 徽标 ---------- */
.btn {
  display: inline-block; padding: 13px 22px; border-radius: 10px;
  background: var(--brand); color: #fff; font-weight: 600; font-size: 1rem;
  border: none; cursor: pointer; text-align: center;
}
.btn:hover { background: var(--brand-dark); text-decoration: none; }
.btn-cat { background: var(--cat); }
.btn-cat:hover { background: #6a4394; }
.btn-outline { background: none; color: var(--brand); border: 1.5px solid var(--brand); }
.btn-outline:hover { background: var(--brand-light); }
.badge {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  font-size: .8rem; font-weight: 600;
}
.badge-dog { background: var(--brand-light); color: var(--brand-dark); }
.badge-cat { background: #f0e9f8; color: var(--cat); }
.badge-general { background: var(--accent-light); color: #b4551f; }

/* ---------- 首页 ---------- */
.hero { padding: 36px 0 20px; }
.hero h1 { font-size: 1.7rem; }
.hero p { color: var(--ink-soft); max-width: 640px; }
.hero-cards { display: grid; grid-template-columns: 1fr; gap: 16px; margin: 24px 0 8px; }
.hero-card {
  background: var(--paper); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 24px; border-top: 4px solid var(--dog);
}
.hero-card.cat { border-top-color: var(--cat); }
.hero-card h2 { margin: 0 0 .4em; font-size: 1.15rem; }
.hero-card p { color: var(--ink-soft); font-size: .95rem; margin-bottom: 1em; }
@media (min-width: 700px) { .hero-cards { grid-template-columns: 1fr 1fr; } .hero h1 { font-size: 2.2rem; } }

.section-title { margin: 40px 0 6px; font-size: 1.35rem; }
.section-sub { color: var(--ink-soft); margin-bottom: 18px; }

.guide-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
@media (min-width: 640px) { .guide-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 980px) { .guide-grid { grid-template-columns: repeat(3, 1fr); } }
.guide-card {
  display: block; background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px 18px 16px; color: var(--ink);
  transition: box-shadow .15s, transform .15s;
}
.guide-card:hover { text-decoration: none; box-shadow: var(--shadow); transform: translateY(-2px); }
.guide-card h3 { margin: 8px 0 6px; font-size: 1rem; line-height: 1.5; }
.guide-card p { font-size: .88rem; color: var(--ink-soft); margin: 0; }

/* ---------- 计算器 ---------- */
.calc-note {
  background: var(--brand-light); border-left: 4px solid var(--brand);
  padding: 14px 16px; border-radius: 0 10px 10px 0; margin: 18px 0 24px; font-size: .95rem;
}
.page.cat .calc-note { background: #f0e9f8; border-left-color: var(--cat); }
.calc-form { display: grid; gap: 18px; }
.field label { display: block; font-weight: 600; margin-bottom: 4px; }
.field .hint { font-size: .85rem; color: var(--ink-soft); margin: 4px 0 0; }
.field input[type="number"], .field select {
  width: 100%; padding: 12px 14px; font-size: 1rem;
  border: 1.5px solid var(--line); border-radius: 10px; background: var(--paper); color: var(--ink);
}
.field input:focus, .field select:focus { outline: 2px solid var(--brand); outline-offset: 1px; border-color: var(--brand); }
.page.cat .field input:focus, .page.cat .field select:focus { outline-color: var(--cat); }
.unit-toggle { display: inline-flex; border: 1.5px solid var(--line); border-radius: 10px; overflow: hidden; margin-bottom: 8px; }
.unit-toggle button {
  padding: 8px 20px; border: none; background: var(--paper); cursor: pointer; font-size: .95rem; font-weight: 600; color: var(--ink-soft);
}
.unit-toggle button.active { background: var(--brand); color: #fff; }
.ref-line { font-size: .85rem; color: var(--ink-soft); background: var(--bg); border-radius: 8px; padding: 8px 12px; margin-top: 6px; }

.calc-results {
  margin-top: 28px; border: 1.5px solid var(--line); border-radius: var(--radius);
  padding: 22px 20px; background: var(--bg);
}
.calc-results h2 { margin-top: 0; }
.result-hero { display: flex; flex-wrap: wrap; gap: 12px; margin: 14px 0 18px; }
.result-tile {
  flex: 1 1 140px; background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px;
}
.result-tile .num { font-size: 1.5rem; font-weight: 800; color: var(--brand); line-height: 1.2; }
.page.cat .result-tile .num { color: var(--cat); }
.result-tile .unit { font-size: .9rem; color: var(--ink-soft); font-weight: 600; }
.result-tile .lab { font-size: .82rem; color: var(--ink-soft); margin-top: 2px; }
.calc-steps { font-size: .92rem; color: var(--ink-soft); }
.calc-steps code {
  background: var(--paper); border: 1px solid var(--line); border-radius: 6px;
  padding: 1px 7px; font-size: .85rem; color: var(--ink);
}
.calc-error { color: #b3261e; font-weight: 600; margin-top: 10px; }

.prose ol li, .prose ul li { margin-bottom: .5em; }
.prose h2 { border-bottom: 1px solid var(--line); padding-bottom: .3em; }

.faq-item { border: 1px solid var(--line); border-radius: 10px; margin-bottom: 10px; background: var(--paper); }
.faq-item summary { cursor: pointer; font-weight: 600; padding: 14px 16px; list-style: none; position: relative; padding-right: 40px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 16px; top: 12px; font-size: 1.3rem; color: var(--ink-soft); }
.faq-item[open] summary::after { content: "−"; }
.faq-item .faq-body { padding: 0 16px 14px; color: var(--ink-soft); font-size: .95rem; }

.disclaimer-box {
  margin-top: 32px; background: #fdf6ec; border: 1px solid #f0ddba; border-radius: 10px;
  padding: 16px 18px; font-size: .9rem; color: #7a5c1e;
}

/* 指南页底部工具卡片 */
.tool-cta {
  margin-top: 34px; border-radius: var(--radius); padding: 22px 20px;
  background: var(--brand-light); border: 1px solid #cfe8e2;
}
.tool-cta.cat { background: #f0e9f8; border-color: #ddcdf0; }
.tool-cta h3 { margin-top: 0; }
.tool-cta p { font-size: .93rem; color: var(--ink-soft); }

.related-links { margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--line); }
.related-links h2 { margin-top: 0; font-size: 1.05rem; }
.related-links ul { padding-left: 1.2em; }

/* 表格 */
table { border-collapse: collapse; width: 100%; margin: 1em 0; font-size: .92rem; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
th { background: var(--bg); }

/* ---------- 合规页 ---------- */
.compliance-list li { margin-bottom: .6em; }
address { font-style: normal; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: #20312d; color: #c8d5d1; margin-top: 48px; padding: 36px 0 28px; font-size: .92rem;
}
.site-footer a { color: #9fd8cb; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
@media (min-width: 760px) { .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; } }
.site-footer h3 { color: #fff; font-size: 1rem; margin: 0 0 10px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer ul li { margin-bottom: 8px; }
.footer-brand { font-weight: 700; color: #fff; font-size: 1.05rem; margin-bottom: 8px; }
.footer-note { color: #93a5a0; font-size: .85rem; }
.footer-bottom { border-top: 1px solid #35494400; margin-top: 26px; padding-top: 18px; color: #8fa29d; font-size: .82rem; }