/* ============================================================
   Axiom Science — 官网（极简 Biomni/Claude 风）
   暖纸底 + 墨字 + 橘红 clay 强调（沿用官网色系）
   ============================================================ */
:root {
  --paper: #F7F5F0;
  --card: #FFFFFF;
  --ink: #1F1E1C;
  --soft: #6E6862;
  --line: #E3DFD5;
  --clay: #c15f3c;
  --clay-deep: #a34e31;
  --clay-wash: #F0E2D6;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  font-size: 17px; line-height: 1.65; -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img, video { max-width: 100%; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 28px; }

/* ---------- 导航 ---------- */
.nav { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(10px); }
.nav-inner { max-width: 1240px; margin: 0 auto; padding: 0 28px; height: 64px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 9px; font-size: 17px; color: var(--ink); }
.brand b { font-weight: 700; }
.nav-links { display: flex; gap: 6px; }
.nav-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px; border-radius: 999px; border: 1px solid var(--line);
  font-size: 13.5px; font-weight: 600; color: var(--soft); background: var(--card);
  transition: .15s;
}
.nav-pill:hover { border-color: var(--clay); color: var(--clay); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-weight: 600; font-size: 15px; padding: 11px 20px; border-radius: 12px; border: 1px solid transparent; cursor: pointer; }
.btn-dark, .btn-primary { background: var(--ink); color: #fff; }
.btn-dark:hover, .btn-primary:hover { background: #000; }

/* ---------- Hero：公告页式大标题 ---------- */
.hero { padding: 84px 28px 40px; text-align: center; }
.hero-tags { display: flex; justify-content: center; gap: 26px; margin-bottom: 30px; }
.hero-tags span { font-size: 15px; font-weight: 700; color: var(--ink); }
.hero-tags .tag-on { color: var(--clay); }
.hero-title {
  margin: 0 auto; max-width: 15em;
  font-size: clamp(40px, 5.6vw, 76px); font-weight: 800; letter-spacing: -.03em; line-height: 1.12;
}
.hero-date { margin: 26px 0 34px; font-size: 14.5px; color: var(--soft); }
.hero-actions { display: flex; justify-content: center; gap: 12px; }
.btn-lg { padding: 14px 30px; font-size: 16.5px; border-radius: 13px; }

/* ---------- 宣传片 ---------- */
.film { padding: 40px 28px 40px; }
.film .wrap { max-width: 1240px; }
.film video { display: block; width: 100%; border-radius: 18px; border: 1px solid var(--line); background: #17130e; box-shadow: 0 30px 80px rgba(23,19,14,.16); }

/* ---------- 工具三卡 ---------- */
.env { padding: 100px 28px; }
.env-title { text-align: center; font-size: clamp(30px, 3.4vw, 44px); font-weight: 800; letter-spacing: -.02em; margin: 0 0 56px; color: var(--clay); }
.env-grid { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.env-card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 34px 30px 26px; text-align: center; }
.env-card .ico { width: 64px; height: 64px; margin: 0 auto 18px; border-radius: 50%; background: var(--clay-wash, #F0E2D6); display: flex; align-items: center; justify-content: center; }
.env-card .ico svg [stroke] { stroke: #c15f3c; }
.env-card .num { font-size: 46px; font-weight: 800; letter-spacing: -.02em; }
.env-card .lab { font-size: 19px; font-weight: 700; color: var(--clay); margin: 2px 0 16px; }
.env-card ul { margin: 0 0 18px; padding: 0; list-style: none; font-size: 15px; color: var(--soft); display: flex; flex-direction: column; gap: 7px; }
.env-card ul li::before { content: "·"; margin-right: 7px; color: var(--clay); font-weight: 700; }
.env-card .foot { border-top: 1px solid var(--line); padding-top: 14px; font-family: ui-monospace, Menlo, monospace; font-size: 12.5px; color: var(--faint, #8b8073); }

/* ---------- FAQ ---------- */
.faq { padding: 100px 28px; }
.faq .wrap, .faq-list { max-width: 860px; margin-left: auto; margin-right: auto; }
.faq h2 { text-align: center; font-size: clamp(30px, 3.4vw, 44px); font-weight: 800; letter-spacing: -.02em; margin: 0 0 48px; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; padding: 22px 4px; font-weight: 640; font-size: 17.5px; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; font-size: 26px; color: var(--clay); transition: transform .2s; }
.faq-list details[open] summary::after { content: "–"; transform: rotate(180deg); }
.faq-list .a { padding: 0 4px 22px; color: var(--soft); font-size: 16px; line-height: 1.75; }

/* ---------- 尾 CTA ---------- */
.cta { padding: 40px 28px 100px; text-align: center; }
.cta h2 { font-size: clamp(30px, 3.4vw, 44px); font-weight: 800; letter-spacing: -.02em; margin: 0 0 28px; }
.cta-actions { display: flex; justify-content: center; gap: 12px; }

/* ---------- 页脚 ---------- */
footer { border-top: 1px solid var(--line); background: var(--paper); }
.foot-inner { max-width: 1180px; margin: 0 auto; padding: 56px 28px 30px; display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
.foot-brand { display: flex; gap: 12px; align-items: flex-start; }
.foot-brand b { font-size: 17px; }
.foot-brand p { margin: 6px 0 0; font-size: 14.5px; color: var(--soft); }
.foot-col { display: flex; flex-direction: column; gap: 9px; }
.foot-col h4 { margin: 0 0 4px; font-size: 13px; letter-spacing: .14em; text-transform: uppercase; color: var(--soft); }
.foot-col a { font-size: 14.5px; color: var(--soft); }
.foot-col a:hover { color: var(--ink); }
.foot-bottom { max-width: 1180px; margin: 0 auto; padding: 24px 28px 34px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; font-size: 13.5px; color: var(--soft); }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .env-grid { grid-template-columns: 1fr; }
  .foot-inner { grid-template-columns: 1fr; }
}

/* ---------- Claude 式纯文字菜单 ---------- */
.nav-item { font-weight: 700; font-size: 15.5px; color: var(--ink); display: inline-flex; align-items: center; gap: 5px; }
.nav-item:hover { color: var(--clay); }
.nav-links { gap: 26px; }

/* ---------- 环境目录按钮居中 ---------- */
.env-more { display: flex; justify-content: center; margin-top: 44px; }

/* ---------- 三卡图标动效 ---------- */
.env-card .ico { overflow: visible; transition: transform .35s cubic-bezier(.2,.75,.25,1); }
.env-card:hover .ico { transform: translateY(-4px); }
.env-card .nd { animation: ndfloat 3.2s ease-in-out infinite; transform-box: fill-box; transform-origin: center; }
.env-card .nd:nth-of-type(2) { animation-delay: .5s; }
.env-card .nd:nth-of-type(3) { animation-delay: 1s; }
.env-card .nd:nth-of-type(4) { animation-delay: 1.5s; }
.env-card .nd:nth-of-type(5) { animation-delay: 2s; }
@keyframes ndfloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-2.2px); }
}
.env-card .dbl { animation: dbwave 3.4s ease-in-out infinite; }
.env-card .dbl:nth-of-type(2) { animation-delay: .5s; }
.env-card .dbl:nth-of-type(3) { animation-delay: 1s; }
@keyframes dbwave {
  0%, 100% { opacity: 1; }
  50% { opacity: .45; }
}
.env-card .ico-wrench { animation: icoturn 4.5s ease-in-out infinite; transform-origin: 50% 50%; }
@keyframes icoturn {
  0%, 78%, 100% { transform: rotate(0); }
  86% { transform: rotate(-14deg); }
  93% { transform: rotate(6deg); }
}

/* ---------- 长文（宣传片下方，宽度与视频对齐） ---------- */
.essay { max-width: 1180px; margin: 72px auto 0; padding: 0 28px; }
.essay p { margin: 0 0 26px; font-size: 16px; line-height: 1.9; color: var(--ink); }
.essay p b { color: var(--ink); }