/* Kittens — 猫咪护理临床手册：冷灰白 + 医疗深青 + 等宽标签 + 直角图表行
   视觉定位：兽医诊所「护理记录表」，与圆角卡片/衬线/暖纸底/emoji 的「house style」彻底切割
   - 直角（0/2px），无圆角卡片，无 hover 上浮，无 emoji，无衬线
   - 无衬线正文 + 等宽字体标签/编号；自动 Q01/Q02 问答编号；左侧粗条图表行 */
:root {
  --bg: #eef1f4;          /* 冷灰白 */
  --panel: #ffffff;
  --line: #d5dde3;
  --line-strong: #aebbc4;
  --text: #16232e;        /* 深海军 */
  --muted: #5c6b76;
  --primary: #0f5f6d;     /* 医疗深青 */
  --primary-deep: #0a4753;
  --primary-soft: #e7f0f2;
  --accent: #c98a2e;      /* 琥珀，仅阶段标签 */
  --accent-soft: #f6ead8;
  --vet: #b13a2e;         /* 医疗红 */
  --vet-bg: #fbeeec;
  --mono: "SFMono-Regular", "Cascadia Mono", Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: var(--sans); line-height: 1.65; font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
a:hover { color: var(--primary); }
.wrap { max-width: 1000px; margin: 0 auto; padding: 0 clamp(1rem, 4vw, 2rem); }
.wrap--narrow { max-width: 720px; }

/* ---------- 顶栏：白底 + 2px 深青底线 ---------- */
.topbar { position: sticky; top: 0; z-index: 30; background: #fff; border-bottom: 2px solid var(--primary); }
.topbar__row { display: flex; align-items: center; gap: 1.2rem; padding: 0.8rem 0; }
.logo { display: flex; align-items: center; gap: 0.6rem; font-family: var(--mono); font-size: 1.05rem; font-weight: 700; letter-spacing: 0.02em; text-transform: uppercase; }
.logo__mark { display: inline-flex; width: 30px; height: 30px; }
.logo__mark svg { width: 30px; height: 30px; }
.nav { display: flex; align-items: center; gap: 1.2rem; margin-left: auto; font-size: 0.86rem; font-family: var(--mono); }
.nav__group { display: flex; gap: 1rem; text-transform: uppercase; letter-spacing: 0.05em; }
.nav a { color: var(--muted); }
.nav a:hover { color: var(--text); }
.langbtn { border: 1px solid var(--line-strong); padding: 0.2rem 0.7rem; font-size: 0.8rem; font-family: var(--mono); background: #fff; }
.langbtn:hover { color: var(--primary); border-color: var(--primary); }

/* ---------- hero ---------- */
.hero { padding: clamp(2.2rem, 5vw, 3.4rem) 0 2.2rem; border-bottom: 1px solid var(--line-strong); }
.hero__grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 2rem; align-items: center; }
.hero__eyebrow { color: var(--primary); font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.16em; text-transform: uppercase; margin: 0 0 0.6rem; }
.hero__title { font-size: clamp(1.9rem, 4.5vw, 2.7rem); line-height: 1.15; margin: 0 0 1rem; font-weight: 800; letter-spacing: -0.01em; }
.hero__sub { color: var(--muted); font-size: 1.02rem; max-width: 520px; margin: 0; }
.hero__art { display: flex; justify-content: center; }
.hero__art svg { width: 100%; max-width: 200px; height: auto; border: 1px solid var(--line); background: #fff; }

/* ---------- band ---------- */
.band { padding: 2.2rem 0 0.8rem; }
.band--stage { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.band--faq { padding-bottom: 3rem; }
.band__title { font-size: 1.35rem; margin: 0 0 0.3rem; font-weight: 800; }
.band__sub { color: var(--muted); margin: 0 0 1.3rem; font-size: 0.95rem; }

/* ---------- 阶段「图表行」（直角 + 顶部深青条） ---------- */
.stage-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.stage-card {
  display: flex; flex-direction: column; gap: 0.6rem;
  background: var(--panel); border: 1px solid var(--line); border-top: 3px solid var(--primary);
  padding: 1.1rem 1rem 1.2rem;
}
.stage-card:hover { background: var(--primary-soft); }
.stage-card__img { display: flex; justify-content: center; }
.stage-card__img svg { width: 92px; height: 92px; }
.stage-card__body { display: flex; flex-direction: column; gap: 0.1rem; text-align: center; }
.stage-card__name { font-size: 1.1rem; font-weight: 700; }
.stage-card__range { color: var(--primary); font-family: var(--mono); font-size: 0.82rem; }
.stage-card__count { color: var(--muted); font-family: var(--mono); font-size: 0.78rem; }

/* ---------- 顾虑「索引项」（左侧粗条） ---------- */
.concern-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 0.7rem; }
.concern-card {
  display: flex; align-items: center; gap: 0.55rem;
  background: var(--panel); border: 1px solid var(--line); border-left: 3px solid var(--line-strong);
  padding: 0.7rem 0.8rem;
}
.concern-card:hover { border-left-color: var(--primary); background: var(--primary-soft); }
.concern-card__icon { display: none; }
.concern-card::before { content: "\25B8"; font-family: var(--mono); color: var(--primary); }
.concern-card__name { font-weight: 600; }
.concern-card__count { margin-left: auto; color: var(--muted); font-family: var(--mono); font-size: 0.8rem; }

/* ---------- 手风琴问答：自动 Q 编号图表 ---------- */
.acc-list { display: flex; flex-direction: column; gap: 0.5rem; counter-reset: q; }
.acc { background: var(--panel); border: 1px solid var(--line); counter-increment: q; }
.acc[open] { border-left: 3px solid var(--primary); }
.acc__q { display: flex; align-items: center; gap: 0.7rem; padding: 0.85rem 1rem; cursor: pointer; list-style: none; font-weight: 600; }
.acc__q::-webkit-details-marker { display: none; }
.acc__mark { display: none; }
.acc__q::before { content: "Q" counter(q, decimal-leading-zero); font-family: var(--mono); font-weight: 600; color: var(--primary); min-width: 2.2rem; }
.acc__qtext { flex: 1; }
.acc__chev { width: 8px; height: 8px; border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted); transform: rotate(45deg); transition: transform 0.15s ease; }
.acc[open] .acc__chev { transform: rotate(225deg); }
.acc__a { padding: 0 1rem 1rem; border-top: 1px dashed var(--line); }
.acc__quick { color: var(--text); margin: 0.8rem 0 0.4rem; }
.acc__more { color: var(--primary); font-weight: 600; font-size: 0.86rem; font-family: var(--mono); text-transform: uppercase; letter-spacing: 0.04em; }
.acc__more:hover { color: var(--primary-deep); }

/* ---------- 阶段页 / 顾虑页 ---------- */
.hub { padding: 1.8rem 0 3rem; }
.crumb { color: var(--muted); font-size: 0.88rem; font-family: var(--mono); }
.crumb:hover { color: var(--primary); }
.hub__head { display: flex; align-items: center; gap: 1.4rem; margin: 1rem 0 1.2rem; padding-bottom: 1.1rem; border-bottom: 1px solid var(--line-strong); }
.hub__head svg { width: 100px; height: 100px; flex: 0 0 auto; border: 1px solid var(--line); background: #fff; }
.hub__icon { display: none; }
.hub__title { font-size: clamp(1.7rem, 4vw, 2.2rem); margin: 0 0 0.3rem; font-weight: 800; }
.hub__range { color: var(--primary); font-size: 0.95rem; font-family: var(--mono); }
.hub__sub { color: var(--muted); margin: 0; max-width: 620px; }
.hub__tabs { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0 0 1.8rem; }
.hub__tabs a { border: 1px solid var(--line); background: #fff; padding: 0.3rem 0.85rem; font-size: 0.82rem; color: var(--muted); font-family: var(--mono); text-transform: uppercase; letter-spacing: 0.03em; }
.hub__tabs a:hover { border-color: var(--primary); color: var(--primary); }
.hub__group { margin-bottom: 1.7rem; }
.hub__group-title { font-family: var(--mono); font-size: 0.92rem; margin: 0 0 0.7rem; color: var(--primary-deep); text-transform: uppercase; letter-spacing: 0.06em; padding-left: 0.6rem; border-left: 3px solid var(--primary); }

/* ---------- 详情页 ---------- */
.answer { padding: 1.6rem 0 3rem; }
.crumbs { display: flex; flex-wrap: wrap; gap: 0.4rem; color: var(--muted); font-size: 0.84rem; margin-bottom: 1.1rem; font-family: var(--mono); }
.crumbs a:hover { color: var(--primary); }
.crumbs span[aria-hidden] { color: var(--line-strong); }
.answer__head { display: flex; gap: 1.4rem; align-items: center; margin-bottom: 1.4rem; padding-bottom: 1.2rem; border-bottom: 1px solid var(--line-strong); }
.answer__art svg { width: 120px; height: 120px; flex: 0 0 auto; border: 1px solid var(--line); background: #fff; }
.answer__tags { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 0.6rem; }
.tag { font-size: 0.76rem; padding: 0.2rem 0.65rem; font-weight: 600; font-family: var(--mono); text-transform: uppercase; letter-spacing: 0.05em; }
.tag--stage { background: var(--accent-soft); color: #7a5410; }
.tag--concern { background: var(--primary-soft); color: var(--primary-deep); }
.answer__q { font-size: clamp(1.5rem, 4vw, 2rem); line-height: 1.2; margin: 0; font-weight: 800; }
.answer__card { background: var(--panel); border: 1px solid var(--line); padding: 1.4rem 1.5rem; }
.quick { background: var(--primary-soft); border-left: 4px solid var(--primary); padding: 0.8rem 1rem; margin-bottom: 1.2rem; }
.quick__label { margin: 0 0 0.3rem; font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--primary-deep); font-weight: 700; font-family: var(--mono); }
.quick__text { margin: 0; font-size: 1.02rem; }
.answer__label { font-size: 1.15rem; margin: 0 0 0.6rem; font-weight: 700; }
.answer__a p { margin: 0 0 0.85rem; }
/* 深度分节：与导语之间用细线分隔，标题为节标题 */
.answer__sec { margin-top: 1.5rem; padding-top: 1.3rem; border-top: 1px solid var(--line); }
.answer__sec .answer__label { font-size: 1.08rem; margin-bottom: 0.7rem; color: var(--primary-deep); }
.answer__sec .answer__a p:last-child { margin-bottom: 0; }
.vet { background: var(--vet-bg); border: 1px solid #e6b7b0; border-left: 4px solid var(--vet); padding: 0.9rem 1rem; margin-top: 1.2rem; }
.vet__label { margin: 0 0 0.3rem; font-weight: 700; color: var(--vet); font-family: var(--mono); text-transform: uppercase; letter-spacing: 0.04em; font-size: 0.84rem; }
.vet__text { margin: 0; color: #7c2f24; font-size: 0.93rem; }

/* ---------- 相关 ---------- */
.related { margin-top: 1.8rem; }
.related__title { font-size: 1.05rem; margin: 0 0 0.8rem; font-family: var(--mono); text-transform: uppercase; letter-spacing: 0.05em; color: var(--primary-deep); }

/* ---------- 静态页 ---------- */
.section { padding: 2.2rem 0 3rem; }
.page-title { font-size: clamp(1.7rem, 4vw, 2.2rem); margin: 0 0 0.6rem; font-weight: 800; }
.page-lead { color: var(--muted); }
.static__body p { margin: 0 0 1rem; }

/* ---------- 页脚 ---------- */
.footer { border-top: 2px solid var(--primary); padding: 1.6rem 0 2.2rem; margin-top: 2rem; background: #fff; }
.footer__row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.footer__brand { font-family: var(--mono); font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; }
.footer__links { display: flex; gap: 1.1rem; }
.footer__links a { color: var(--muted); font-size: 0.88rem; }
.footer__links a:hover { color: var(--primary); }
.footer__year { color: var(--muted); font-family: var(--mono); font-size: 0.82rem; }

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__art { order: -1; }
  .stage-grid { grid-template-columns: 1fr; }
  .nav__group { display: none; }
  .answer__head { flex-direction: column; align-items: flex-start; }
  .hub__head { flex-direction: column; align-items: flex-start; }
}

/* ---------- 编辑导语 ---------- */
.intro { padding: 1.8rem 0 0.2rem; }
.intro p { color: var(--text); margin: 0 0 1rem; max-width: 720px; }
.intro p:last-child { margin-bottom: 0; }
.hub__intro { margin: 0 0 1.6rem; }
.hub__intro p { color: var(--text); margin: 0 0 0.85rem; max-width: 720px; }
.hub__intro p:last-child { margin-bottom: 0; }