/* ============================================================
   鸿禾 · /assets/site.css
   共享底层：重置 / 变量 / 中文排版 / 页眉 / 页脚 / 通用组件
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root{
  --green:#0E2E27;
  --ink-deep:#07130F;
  --moss:#3F5F4E;
  --gold:#C9A45C;
  --gold-light:#E6D2A6;
  --porcelain:#F6F3EA;
  --porcelain-deep:#EDE6D4;
  --stone:#6B675D;
  --clay:#A7765B;
  --cinnabar:#B23A2C;
  --ink:#14120F;

  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC",STSong,SimSun,serif;
  --sans:"Inter","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --wrap-max:1280px;
  --gut:clamp(16px,4vw,48px);
  --rail-h:34px;
  --bar-h:72px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
main{display:block}
::selection{background:var(--gold);color:var(--ink-deep)}

/* ---------- 3. 中文排版基调 ---------- */
body{
  background:var(--porcelain);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
h1,h2,h3,h4{
  font-family:var(--serif);
  font-weight:600;
  letter-spacing:.02em;
  line-height:1.25;
  text-align:left;
  color:var(--ink);
}
h1{font-size:clamp(30px,4.4vw,44px);line-height:1.2;font-weight:700}
h2{font-size:clamp(23px,2.6vw,28px);line-height:1.35}
h3{font-size:20px;line-height:1.5}
h4{font-size:16px;line-height:1.6}

.eyebrow{
  display:inline-block;
  font-family:var(--mono);
  font-size:12px;
  line-height:18px;
  letter-spacing:.18em;
  color:var(--gold);
  text-transform:uppercase;
}
.data{
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.04em;
}
.data--gold{color:var(--gold)}

.rule{display:block;height:0;border-top:1px solid var(--stone);opacity:.45}
.rule--gold{border-top-color:var(--gold);opacity:.7}
.tick-rule{
  display:block;height:7px;
  border-top:1px solid rgba(107,103,93,.5);
  background-image:repeating-linear-gradient(to right,rgba(107,103,93,.6) 0 1px,transparent 1px 18px);
  background-size:100% 6px;
  background-repeat:repeat-x;
  background-position:left top;
}

.prose{max-width:68ch}
.prose p + p{margin-top:1.1em}
.prose ul,.prose ol{margin-top:1em;padding-left:1.25em;list-style:square}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.4em}
.prose a{
  color:inherit;
  text-decoration:underline;
  text-decoration-color:var(--gold);
  text-underline-offset:.28em;
  text-decoration-thickness:1px;
}
.prose a:hover{color:var(--green);text-decoration-color:var(--green)}
.prose strong{font-weight:600;color:var(--green)}

/* ---------- 4. 布局工具 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap-max);
  margin-inline:auto;
  padding-inline:var(--gut);
}
.section{padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(28px,4vw,48px)}
.section--green{background:var(--green);color:var(--porcelain)}
.section--green h1,.section--green h2,.section--green h3{color:var(--porcelain)}
.section--sand{background:var(--porcelain-deep)}

.grid{display:grid;gap:clamp(20px,3vw,40px)}
.grid--asym{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid--note{grid-template-columns:minmax(0,1fr) 240px}
.grid--note > .grid__aside{order:2}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  min-height:44px;
  padding:0 22px;
  font-family:var(--sans);
  font-size:14px;
  font-weight:500;
  letter-spacing:.05em;
  line-height:1.2;
  text-align:center;
  border:1px solid transparent;
  border-radius:0;
  cursor:pointer;
  transition:background-color .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease);
}
.btn--gold{background:var(--gold);border-color:var(--gold);color:var(--ink-deep)}
.btn--gold:hover{background:var(--gold-light);border-color:var(--gold-light)}
.btn--dark{background:var(--green);border-color:var(--green);color:var(--porcelain)}
.btn--dark:hover{background:var(--moss);border-color:var(--moss)}
.btn--ghost{background:transparent;border-color:rgba(230,210,166,.5);color:var(--porcelain)}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn--block{width:100%}

/* ---------- 6. 面包屑 ---------- */
.breadcrumb{
  font-family:var(--mono);
  font-size:12px;
  line-height:18px;
  letter-spacing:.04em;
  color:var(--stone);
}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:rgba(107,103,93,.45)}
.breadcrumb__link{color:var(--stone);border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease)}
.breadcrumb__link:hover{color:var(--green);border-bottom-color:var(--gold)}
.breadcrumb__current{color:var(--ink)}

/* ---------- 7. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  padding:8px;
  background:var(--porcelain);
  border:1px solid rgba(107,103,93,.35);
}
.section--green .media-frame{background:rgba(7,19,15,.35);border-color:rgba(230,210,166,.3)}
.media{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  isolation:isolate;
  background:linear-gradient(160deg,var(--moss) 0%,var(--green) 58%,var(--ink-deep) 100%);
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:2;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(230,210,166,.14) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(230,210,166,.09) 1px,transparent 1px);
  background-size:64px 64px;
  opacity:.55;
}
.media > img{width:100%;height:100%;object-fit:cover}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--3x4{aspect-ratio:3/4}
.media--1x1{aspect-ratio:1/1}
.media--21x9{aspect-ratio:21/9}
.media__caption{
  position:absolute;
  left:0;
  bottom:0;
  z-index:3;
  padding:8px 14px;
  background:rgba(7,19,15,.82);
  font-family:var(--mono);
  font-size:11px;
  line-height:16px;
  letter-spacing:.06em;
  color:var(--gold-light);
}

/* ---------- 8. 章节目录（可选组件） ---------- */
.section-index{
  position:sticky;
  top:calc(var(--rail-h) + var(--bar-h) + 28px);
  display:grid;
  gap:0;
  border-top:1px solid var(--stone);
}
.section-index__link{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:11px 0;
  font-size:13px;
  line-height:1.5;
  color:var(--stone);
  border-bottom:1px solid rgba(107,103,93,.25);
  transition:color .2s var(--ease);
}
.section-index__link:hover{color:var(--ink)}
.section-index__num{font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:rgba(107,103,93,.75)}
.section-index__link.is-active{color:var(--ink);font-weight:500}
.section-index__link.is-active .section-index__num{color:var(--gold)}

/* ---------- 9. 焦点与锚点 ---------- */
:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--gold);
  outline-offset:3px;
  box-shadow:0 0 0 4px rgba(14,46,39,.28);
}
:where(section,[id]){scroll-margin-top:calc(var(--rail-h) + var(--bar-h) + 20px)}

.skip-link{
  position:fixed;
  top:0;
  left:0;
  z-index:1000;
  padding:12px 22px;
  background:var(--gold);
  color:var(--ink-deep);
  font-size:14px;
  font-weight:600;
  letter-spacing:.05em;
  transform:translateY(-140%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 10. 页眉 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:200;
  background:var(--green);
  color:var(--porcelain);
  border-bottom:1px solid rgba(201,164,92,.35);
  transition:border-color .2s var(--ease);
}
.site-header[data-scrolled="true"]{border-bottom-color:var(--gold)}

.header-rail{
  background:var(--ink-deep);
  border-bottom:1px solid rgba(230,210,166,.14);
}
.header-rail__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:var(--rail-h);
}
.header-notice{
  display:flex;
  align-items:center;
  gap:9px;
  min-width:0;
  font-family:var(--mono);
  font-size:12px;
  line-height:18px;
  letter-spacing:.04em;
  color:var(--gold-light);
}
.header-notice__dot{
  flex:none;
  width:6px;
  height:6px;
  background:var(--cinnabar);
  box-shadow:0 0 0 3px rgba(178,58,44,.2);
}
.header-notice__text{
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}
.utility-list{display:flex;align-items:center;gap:20px;flex:none}
.utility-list__item{flex:none}
.utility-link{
  display:inline-block;
  padding-block:2px;
  font-family:var(--mono);
  font-size:12px;
  line-height:18px;
  letter-spacing:.04em;
  color:rgba(246,243,234,.7);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.utility-link:hover{color:var(--gold);border-bottom-color:var(--gold)}

.header-bar__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:clamp(14px,2vw,30px);
  min-height:var(--bar-h);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:none;
  padding-block:10px;
}
.brand__mark{
  display:grid;
  place-items:center;
  flex:none;
  width:38px;
  height:38px;
  border:1px solid var(--gold);
  color:var(--gold);
  font-family:var(--serif);
  font-size:19px;
  font-weight:700;
  line-height:1;
}
.brand__text{display:flex;flex-direction:column;gap:2px}
.brand__name{
  font-family:var(--serif);
  font-size:22px;
  font-weight:700;
  line-height:1.1;
  letter-spacing:.16em;
  color:var(--porcelain);
}
.brand__line{
  font-family:var(--mono);
  font-size:11px;
  line-height:1.35;
  letter-spacing:.06em;
  color:rgba(230,210,166,.7);
}

.site-nav{margin-left:auto}
.site-nav__list{display:flex;align-items:stretch;gap:clamp(10px,1.4vw,22px)}
.site-nav__item{display:flex}
.site-nav__link{
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:10px 0;
  font-size:14px;
  font-weight:500;
  letter-spacing:.02em;
  color:rgba(246,243,234,.82);
  border-bottom:2px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.site-nav__index{
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.06em;
  color:rgba(201,164,92,.55);
  transition:color .2s var(--ease);
}
.site-nav__label{white-space:nowrap}
.site-nav__link:hover{color:var(--gold-light);border-bottom-color:rgba(201,164,92,.5)}
.site-nav__link[aria-current="page"]{color:var(--gold);border-bottom-color:var(--gold)}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--gold)}
.site-nav__foot{display:none}
.site-nav__note{
  font-family:var(--mono);
  font-size:11px;
  line-height:1.5;
  letter-spacing:.06em;
  color:rgba(230,210,166,.6);
}

.header-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  flex:none;
  min-height:38px;
  padding:0 18px;
  background:var(--gold);
  color:var(--ink-deep);
  font-size:13px;
  font-weight:600;
  letter-spacing:.06em;
  transition:background-color .2s var(--ease),color .2s var(--ease);
}
.header-cta:hover{background:var(--gold-light);color:var(--ink-deep)}

.nav-toggle{display:none}

.header-progress{
  position:relative;
  height:2px;
  background:rgba(230,210,166,.16);
}
.header-progress__bar{
  display:block;
  width:0;
  height:100%;
  background:var(--gold);
}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  background:var(--green);
  color:rgba(246,243,234,.76);
  border-top:1px solid var(--gold);
  font-size:14px;
  line-height:1.7;
}
.footer-main{padding-block:clamp(40px,6vw,72px) clamp(28px,4vw,48px)}
.footer-grid{
  display:grid;
  gap:clamp(24px,3vw,40px);
  grid-template-columns:1.6fr .8fr .8fr .8fr 1.3fr;
  align-items:start;
}

.footer-brand__name{
  display:flex;
  align-items:center;
  gap:12px;
  font-family:var(--serif);
  font-size:26px;
  font-weight:700;
  line-height:1.2;
  letter-spacing:.16em;
  color:var(--porcelain);
}
.footer-brand__name::after{
  content:"";
  flex:1;
  height:1px;
  background:rgba(201,164,92,.45);
}
.footer-brand__line{
  margin-top:14px;
  max-width:26em;
  color:rgba(246,243,234,.72);
}
.footer-marks{
  margin-top:22px;
  max-width:26em;
  border-top:1px solid rgba(201,164,92,.28);
}
.footer-mark{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  padding-block:7px;
  border-bottom:1px solid rgba(201,164,92,.16);
}
.footer-mark__k{font-size:12px;letter-spacing:.08em;color:rgba(246,243,234,.55)}
.footer-mark__v{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--gold);
}

.footer-col__title{
  margin:0 0 12px;
  padding-bottom:12px;
  border-bottom:1px solid rgba(201,164,92,.28);
  font-family:var(--mono);
  font-size:11px;
  font-weight:500;
  line-height:1.4;
  letter-spacing:.16em;
  color:var(--gold);
}
.footer-col__list{display:grid;gap:9px}
.footer-col__link{
  display:inline-block;
  font-size:14px;
  color:rgba(246,243,234,.78);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-col__link:hover{color:var(--gold-light);border-bottom-color:rgba(201,164,92,.7)}

.footer-contact__list{display:grid;gap:12px}
.footer-contact__item{display:grid;gap:3px}
.footer-contact__k{
  font-family:var(--mono);
  font-size:10px;
  line-height:1.4;
  letter-spacing:.16em;
  color:rgba(230,210,166,.55);
}
.footer-contact__v{
  font-size:13px;
  line-height:1.6;
  color:var(--porcelain);
  overflow-wrap:anywhere;
}
.footer-contact__note{
  margin-top:16px;
  padding-top:14px;
  border-top:1px solid rgba(201,164,92,.2);
  font-size:12px;
  line-height:1.7;
  color:rgba(246,243,234,.55);
}

.footer-bottom{
  background:var(--ink-deep);
  border-top:1px solid rgba(201,164,92,.24);
}
.footer-bottom__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  padding-block:16px;
  font-size:11px;
  line-height:1.6;
  letter-spacing:.06em;
  color:rgba(246,243,234,.55);
}
.footer-bottom__copy{font-family:var(--mono)}
.footer-bottom__legal{display:flex;flex-wrap:wrap;gap:6px 18px}
.footer-bottom__link{
  color:rgba(246,243,234,.62);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-bottom__link:hover{color:var(--gold);border-bottom-color:var(--gold)}
.footer-bottom__icp{font-family:var(--mono);color:rgba(246,243,234,.45)}

/* ---------- 12. 响应式 ---------- */
@media (max-width:1080px){
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{
    grid-column:1 / -1;
    padding-top:24px;
    border-top:1px solid rgba(201,164,92,.2);
  }
  .footer-contact__list{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
}

@media (max-width:960px){
  .nav-toggle{
    display:inline-flex;
    align-items:center;
    gap:8px;
    margin-left:auto;
    padding:9px 13px;
    border:1px solid rgba(230,210,166,.4);
    font-family:var(--mono);
    font-size:12px;
    line-height:1.4;
    letter-spacing:.1em;
    color:var(--gold-light);
    transition:border-color .2s var(--ease),color .2s var(--ease);
  }
  .nav-toggle:hover{border-color:var(--gold);color:var(--gold)}
  .nav-toggle__bars{display:grid;gap:4px;width:16px}
  .nav-toggle__bars span{display:block;height:1px;background:currentColor}
  .nav-toggle__label{white-space:nowrap}

  .site-nav{
    order:5;
    flex-basis:100%;
    margin-left:0;
    margin-top:2px;
    display:none;
    padding-block:6px 18px;
    border-top:1px solid rgba(230,210,166,.18);
  }
  .site-nav[data-open="true"]{display:block}
  .site-nav__list{flex-direction:column;gap:0}
  .site-nav__item{border-bottom:1px solid rgba(230,210,166,.1)}
  .site-nav__link{
    width:100%;
    padding:14px 0;
    font-size:15px;
    border-bottom:0;
    border-left:2px solid transparent;
    padding-left:10px;
  }
  .site-nav__link:hover{border-left-color:rgba(201,164,92,.5)}
  .site-nav__link[aria-current="page"]{
    color:var(--gold);
    border-left-color:var(--gold);
    background:rgba(201,164,92,.08);
  }
  .site-nav__foot{display:block;padding-top:18px}
  .site-nav__note{margin-top:10px}
  .header-cta{display:none}

  .grid--asym,.grid--note{grid-template-columns:minmax(0,1fr)}
  .grid--note > .grid__aside{order:0}
  .section-index{position:static;top:auto}
}

@media (max-width:820px){
  .header-notice{max-width:46vw}
  .utility-list{gap:14px}
}

@media (max-width:640px){
  :root{--rail-h:32px;--bar-h:64px}
  .header-notice__text{max-width:40vw}
  .utility-list{gap:12px}
  .utility-link{font-size:11px}
  .brand__mark{width:32px;height:32px;font-size:16px}
  .brand__name{font-size:19px;letter-spacing:.12em}
  .brand__line{display:none}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-contact__list{grid-template-columns:1fr;gap:10px}
  .footer-bottom__inner{justify-content:flex-start}
  .footer-brand__name{font-size:22px}
}

@media (max-width:420px){
  .header-notice{display:none}
  .header-rail__inner{justify-content:flex-end}
}

/* ---------- 13. 动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}