/* ==========================================================
   华体汇 · 共享站点样式 /assets/site.css
   蓝图网格骨架 + 草原晨光配色
   ========================================================== */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{height:100%}
body{margin:0;min-height:100%}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,ol,ul{margin:0}
ol,ul{padding:0;list-style:none}
img,picture,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}

/* ---------- 2. tokens ---------- */
:root{
  --paper:#FCFDFB;
  --ink:#10263A;
  --ink-soft:#5A6B72;
  --grass:#0E7B6A;
  --forest:#0A5B4F;
  --mist:#E7F3EF;
  --sand:#E0B45C;
  --sand-pale:#F8F1E1;
  --clay:#CC6034;
  --line:#D9E2DE;
  --line-strong:#B9C7C2;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --shell:1280px;
  --pad:clamp(16px,4vw,56px);
  --header-h:74px;
  --dur:320ms;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-soft:0 1px 0 rgba(16,38,58,.05),0 12px 26px -22px rgba(16,38,58,.5);
}

/* ---------- 3. 基础排版 ---------- */
html{scroll-behavior:smooth}
[id]{scroll-margin-top:calc(var(--header-h) + 18px)}
body{
  background-color:var(--paper);
  background-image:linear-gradient(to right,rgba(16,38,58,.035) 1px,transparent 1px);
  background-size:clamp(56px,7vw,104px) 100%;
  background-repeat:repeat;
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:17px;
  font-weight:400;
  line-height:1.85;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-weight:900;line-height:1.2;letter-spacing:-.012em}
strong,b{font-weight:700}
::selection{background:var(--sand);color:var(--ink)}
:focus-visible{outline:2px solid var(--clay);outline-offset:3px;border-radius:1px}

.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}

/* ---------- 4. skip link ---------- */
.skip-link{
  position:fixed;top:-90px;left:16px;z-index:200;
  display:inline-block;padding:10px 18px;
  background:var(--ink);color:var(--paper);
  font-size:14px;font-weight:700;border:1px solid var(--ink);
  transition:top 240ms var(--ease);
}
.skip-link:focus{top:14px}

/* ---------- 5. 布局容器 ---------- */
.container{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--pad)}
.section{position:relative;padding-block:clamp(40px,6vw,88px)}
.section--mist{background:var(--mist);border-block:1px solid var(--line)}
.section--sand{background:var(--sand-pale);border-block:1px solid var(--line)}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(14px,2vw,26px)}
.grid-lines{position:relative}
.grid-lines::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(to right,var(--line) 1px,transparent 1px);
  background-size:clamp(48px,8vw,96px) 100%;
  opacity:.6;
}

/* ---------- 6. 编号章节块 ---------- */
.section-head{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:clamp(12px,2.4vw,32px);align-items:start;
  margin-bottom:clamp(20px,3vw,36px);
}
.section-index{
  font-family:var(--font-mono);font-size:12px;font-weight:700;
  letter-spacing:.18em;color:var(--grass);white-space:nowrap;padding-top:.6em;
}
.section-title{font-size:clamp(26px,3.6vw,42px);font-weight:900;letter-spacing:-.02em;line-height:1.16}
.section-sub{margin-top:.6em;color:var(--ink-soft);font-size:16px;line-height:1.8;max-width:36em}
.lead{font-size:clamp(17px,1.6vw,19px);line-height:1.9;color:var(--ink-soft);max-width:36em}
.prose{max-width:38em}
.prose p{line-height:1.85}
.prose p+p{margin-top:1em}
.prose strong{color:var(--forest)}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.55em;
  padding:12px 22px;border:1px solid transparent;border-radius:1px;
  font-size:15px;font-weight:700;line-height:1.2;letter-spacing:.01em;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform 160ms var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--grass);color:var(--paper);border-color:var(--grass)}
.btn--primary:hover{background:var(--forest);border-color:var(--forest)}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.btn--ghost:hover{background:var(--mist);border-color:var(--grass);color:var(--forest)}
.btn--clay{background:var(--clay);color:#FFF8F3;border-color:var(--clay)}
.btn--clay:hover{background:#B14C26;border-color:#B14C26}

/* ---------- 8. 卡片 / 徽章 / 进度条 ---------- */
.card{
  position:relative;border:1px solid var(--line);border-radius:1px;
  background:var(--paper);box-shadow:var(--shadow-soft);
  padding:clamp(16px,2.2vw,26px);
}
.card--sand{background:var(--sand-pale)}
.card--mist{background:var(--mist)}
.card-title{font-size:clamp(19px,1.8vw,23px);font-weight:900;line-height:1.3}
.card-text{margin-top:.5em;font-size:15px;line-height:1.8;color:var(--ink-soft)}

.badge{
  display:inline-flex;align-items:center;gap:.4em;
  padding:4px 9px;border:1px solid var(--line);border-radius:1px;
  font-family:var(--font-mono);font-size:12px;font-weight:700;
  font-variant-numeric:tabular-nums;line-height:1.5;white-space:nowrap;
}
.badge--price{background:var(--sand);border-color:#CBA045;color:#2C1F05}
.badge--count{background:var(--mist);border-color:var(--line-strong);color:var(--forest)}
.badge--note{background:var(--sand-pale);border-color:var(--sand);color:var(--clay)}

.meter{position:relative;display:block;height:4px;background:var(--line);overflow:hidden;--v:0}
.meter-bar{
  display:block;width:100%;height:100%;
  background:linear-gradient(90deg,var(--grass),var(--sand));
  transform-origin:0 50%;transform:scaleX(var(--v));
  transition:transform 560ms var(--ease);
}

/* ---------- 9. 面包屑 / 目录 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5em;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--ink-soft);
}
.breadcrumb a{color:var(--forest);border-bottom:1px solid transparent;transition:border-color 200ms}
.breadcrumb a:hover{border-bottom-color:var(--grass)}
.breadcrumb-sep{color:var(--line-strong)}
.breadcrumb [aria-current="page"]{color:var(--ink);font-weight:700}

.toc{border-left:1px solid var(--line);padding-left:14px}
.toc-title{
  font-family:var(--font-mono);font-size:11px;font-weight:700;
  letter-spacing:.18em;color:var(--ink-soft);margin-bottom:.7em;
}
.toc-link{
  display:block;padding:6px 0 6px 10px;margin-left:-11px;
  border-left:2px solid transparent;font-size:13px;line-height:1.5;
  color:var(--ink-soft);transition:color 200ms var(--ease),border-color 200ms var(--ease);
}
.toc-link:hover{color:var(--forest)}
.toc-link[aria-current="true"]{color:var(--forest);font-weight:700;border-left-color:var(--sand)}

/* ---------- 10. 图片容器 ---------- */
.photo-frame{
  position:relative;margin:0;overflow:hidden;
  background:var(--mist);border:1px solid var(--line);
}
.photo-frame::before{
  content:"";position:absolute;inset:0;z-index:0;
  background-image:repeating-linear-gradient(135deg,rgba(14,123,106,.09) 0 1px,transparent 1px 12px);
}
.photo-shot{
  position:relative;z-index:1;display:block;width:100%;height:100%;
  aspect-ratio:16/10;object-fit:cover;
  filter:saturate(.94) brightness(1.03);
  transition:transform 420ms var(--ease);
}
.photo-frame:hover .photo-shot{transform:scale(1.015)}
.photo-frame--wide .photo-shot{aspect-ratio:21/9}
.photo-frame--tall .photo-shot{aspect-ratio:4/5}
.photo-frame--square .photo-shot{aspect-ratio:1/1}
.photo-caption{
  position:relative;z-index:1;padding:9px 2px 0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--ink-soft);
}

/* ---------- 11. 显现 ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity 420ms var(--ease),transform 420ms var(--ease)}
.reveal.is-visible{opacity:1;transform:none}

/* ---------- 12. 头部命令栏 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--paper);
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 0 rgba(16,38,58,.03);
  transition:box-shadow var(--dur) var(--ease),background var(--dur) var(--ease);
}
.site-header::before{
  content:"";position:absolute;left:0;right:0;top:0;height:3px;z-index:1;
  background:linear-gradient(90deg,var(--grass) 0 60%,var(--sand) 60% 80%,var(--clay) 80% 100%);
}
.site-header[data-scrolled="true"]{
  background:#FBFCFA;
  box-shadow:0 10px 24px -22px rgba(16,38,58,.7);
}
.header-inner{
  position:relative;display:flex;align-items:center;
  gap:clamp(10px,1.6vw,26px);
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding-inline:var(--pad);height:var(--header-h);
  transition:height var(--dur) var(--ease);
}
.site-header[data-scrolled="true"] .header-inner{height:58px}

.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;padding-block:4px}
.brand-mark{
  position:relative;display:block;flex:0 0 auto;
  width:22px;height:22px;border:1px solid var(--grass);background:var(--sand-pale);
}
.brand-mark-line{position:absolute;inset:5px;border-top:1px solid var(--grass);border-right:1px solid var(--grass)}
.brand-mark::after{content:"";position:absolute;top:-4px;right:-4px;width:6px;height:6px;background:var(--sand)}
.brand-copy{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-size:17px;font-weight:900;letter-spacing:.06em;color:var(--ink)}
.brand-sub{font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;color:var(--ink-soft);margin-top:2px}

.primary-nav{flex:1 1 auto;display:flex;justify-content:flex-end;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.nav-item{flex:0 0 auto}
.nav-link{
  display:inline-flex;align-items:baseline;gap:6px;
  padding:8px 10px;border-radius:1px;font-size:14px;font-weight:500;color:var(--ink);
  transition:background 200ms var(--ease),color 200ms var(--ease),box-shadow 200ms var(--ease);
}
.nav-index{
  font-family:var(--font-mono);font-size:10px;font-weight:700;
  letter-spacing:.04em;color:var(--grass);transition:color 200ms var(--ease);
}
.nav-label{white-space:nowrap}
.nav-link:hover{background:var(--mist);color:var(--forest)}
.nav-link[aria-current="page"]{
  background:var(--mist);color:var(--forest);font-weight:700;
  box-shadow:inset 0 -2px 0 var(--sand);
}
.nav-link[aria-current="page"] .nav-index{color:var(--clay)}

.header-cta{
  flex:0 0 auto;display:inline-flex;align-items:center;gap:.45em;
  padding:10px 16px;border-radius:1px;
  background:var(--grass);color:var(--paper);
  font-size:13px;font-weight:700;letter-spacing:.02em;
  transition:background 200ms var(--ease),transform 160ms var(--ease);
}
.header-cta::before{content:"";width:6px;height:6px;background:var(--sand);flex:0 0 auto}
.header-cta:hover{background:var(--forest)}
.header-cta:active{transform:translateY(1px)}

.nav-toggle{
  display:none;align-items:center;gap:8px;flex:0 0 auto;
  padding:9px 12px;border:1px solid var(--line-strong);border-radius:1px;
  background:var(--paper);color:var(--forest);
  font-size:13px;font-weight:700;letter-spacing:.08em;
  transition:background 200ms var(--ease),border-color 200ms var(--ease);
}
.nav-toggle:hover{background:var(--mist);border-color:var(--grass)}
.nav-toggle-icon{display:grid;gap:5px;width:16px}
.nav-toggle-icon span{
  display:block;height:2px;background:currentColor;
  transition:transform 240ms var(--ease),opacity 200ms var(--ease);
}
.site-header[data-open="true"] .nav-toggle-icon span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle-icon span:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle-icon span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.nav-toggle-text{white-space:nowrap}

.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  overflow:hidden;pointer-events:none;z-index:2;
}
.scroll-progress-bar{
  display:block;width:100%;height:100%;
  background:linear-gradient(90deg,var(--grass),var(--sand));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform 120ms linear;
}

/* ---------- 13. 页脚 ---------- */
.site-footer{
  position:relative;margin-top:clamp(48px,7vw,96px);
  background:var(--forest);color:#E4F0EC;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(to right,rgba(255,255,255,.07) 1px,transparent 1px);
  background-size:clamp(56px,8vw,104px) 100%;
}
.footer-inner{position:relative;max-width:var(--shell);margin-inline:auto;padding-inline:var(--pad)}
.footer-top{
  display:grid;
  grid-template-columns:1.6fr repeat(3,minmax(0,1fr)) 1.5fr;
  gap:clamp(20px,3vw,44px);
  padding-block:clamp(32px,5vw,64px);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.footer-brand-link{font-size:26px;font-weight:900;letter-spacing:.1em;line-height:1.1;color:var(--paper)}
.footer-tagline{font-size:13px;line-height:1.75;color:rgba(228,240,236,.74);max-width:22em}
.footer-shortcut{
  display:inline-flex;align-items:center;gap:.5em;
  padding:9px 14px;border-radius:1px;
  background:var(--sand);color:#2C1F05;
  font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.04em;
  transition:background 200ms var(--ease);
}
.footer-shortcut:hover{background:#EFC97A}

.footer-col-title{
  font-family:var(--font-mono);font-size:11px;font-weight:700;
  letter-spacing:.2em;color:var(--sand);margin-bottom:12px;
}
.footer-list{display:grid;gap:8px}
.footer-link{
  font-size:14px;color:rgba(228,240,236,.84);
  border-bottom:1px solid transparent;
  transition:color 180ms var(--ease),border-color 180ms var(--ease);
}
.footer-link:hover{color:var(--paper);border-bottom-color:var(--sand)}

.footer-contact{display:flex;flex-direction:column;min-width:0}
.contact-list{display:grid;gap:10px}
.contact-item{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:10px;align-items:baseline;font-size:13px;line-height:1.7;
}
.contact-key{
  font-family:var(--font-mono);font-size:10px;font-weight:700;
  letter-spacing:.16em;color:var(--sand);
}
.contact-value{color:rgba(228,240,236,.9);word-break:break-word}
.footer-note{
  margin-top:14px;font-size:12px;line-height:1.75;
  color:rgba(228,240,236,.62);max-width:24em;
}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;
  padding:15px var(--pad);margin-inline:calc(var(--pad) * -1);
  background:var(--ink);
}
.legal-text{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:rgba(228,240,236,.66);font-variant-numeric:tabular-nums;
}

/* ---------- 14. 返回顶部 ---------- */
.to-top{
  position:fixed;right:clamp(14px,3vw,28px);bottom:clamp(14px,3vw,28px);z-index:90;
  display:grid;place-items:center;width:46px;height:46px;
  border:1px solid var(--line-strong);border-radius:1px;
  background:var(--paper);color:var(--forest);box-shadow:var(--shadow-soft);
  opacity:0;transform:translateY(12px);pointer-events:none;
  transition:opacity 260ms var(--ease),transform 260ms var(--ease),background 200ms var(--ease);
}
.to-top[data-visible="true"]{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{background:var(--mist)}
.to-top-arrow{font-size:16px;line-height:1}

/* ---------- 15. 响应式 ---------- */
@media (max-width:1180px){
  .nav-link{padding:8px 7px;font-size:13px}
  .footer-top{grid-template-columns:1.5fr repeat(3,minmax(0,1fr))}
  .footer-contact{grid-column:1 / -1;padding-top:18px;border-top:1px solid rgba(255,255,255,.14)}
  .footer-contact .contact-list{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-note{max-width:44em}
}

@media (max-width:980px){
  :root{--header-h:62px}
  .nav-toggle{display:inline-flex}
  .header-cta{font-size:12px;padding:9px 13px}
  .primary-nav{
    position:absolute;top:100%;left:0;right:0;
    display:block;background:var(--paper);
    border-bottom:1px solid var(--line);
    box-shadow:0 18px 30px -26px rgba(16,38,58,.75);
    padding:0 var(--pad);
    max-height:0;overflow:hidden;opacity:0;visibility:hidden;
    transition:max-height 320ms var(--ease),opacity 200ms linear,visibility 0s linear 320ms;
  }
  .primary-nav[data-open="true"],
  .site-header[data-open="true"] .primary-nav{
    max-height:min(72vh,560px);overflow-y:auto;opacity:1;visibility:visible;
    transition:max-height 320ms var(--ease),opacity 200ms linear,visibility 0s;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0;padding-block:10px 20px}
  .nav-item{width:100%}
  .nav-link{
    display:flex;align-items:baseline;gap:12px;
    padding:13px 2px;font-size:15px;border-bottom:1px solid var(--line);
  }
  .nav-link:hover{background:transparent;color:var(--forest)}
  .nav-link[aria-current="page"]{
    background:transparent;box-shadow:inset 2px 0 0 var(--sand);
    padding-left:12px;color:var(--forest);font-weight:700;
  }
  .section-head{grid-template-columns:minmax(0,1fr);gap:6px}
  .section-index{padding-top:0}
}

@media (max-width:760px){
  body{font-size:16px;line-height:1.8}
  .grid-12{grid-template-columns:minmax(0,1fr);gap:18px}
  .footer-top{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
  .footer-contact .contact-list{grid-template-columns:minmax(0,1fr)}
  .footer-brand-link{font-size:22px}
  .photo-frame--wide .photo-shot{aspect-ratio:16/10}
}

@media (max-width:520px){
  .brand-sub{display:none}
  .brand-name{font-size:16px}
  .nav-toggle-text{display:none}
  .nav-toggle{padding:9px 10px}
  .header-cta{padding:8px 10px;font-size:12px}
  .header-inner{gap:8px}
  .toc{position:static;border-left:0;padding-left:0;border-top:1px solid var(--line);padding-top:12px}
  .to-top{width:42px;height:42px}
}

/* ---------- 16. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  .reveal{opacity:1;transform:none}
  .photo-frame:hover .photo-shot{transform:none}
}