:root{
  --ink:#0B0F0E;
  --white:#FFFFFF;
  --mist:#F3F6F4;
  --grass:#1F7A4D;
  --forest:#123D2B;
  --silver:#C9D1D9;
  --graphite:#5C666D;
  --orange:#F28C28;
  --orange-deep:#B85E12;
  --orange-tint:#FDEBD6;
  --path:#2E9E77;

  --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",ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;

  --maxw:1280px;
  --gutter:clamp(20px,6vw,96px);
  --header-h:56px;
  --line:1px solid var(--silver);
  --radius:2px;
  --shadow:0 1px 2px rgba(11,15,14,.06);
  --ease:cubic-bezier(.2,.7,.3,1);
}

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%;text-size-adjust:100%}

body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.9;
  font-weight:400;
  color:var(--ink);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0}
ul[class],ol[class]{list-style:none;margin:0;padding:0}
img,svg{display:block;max-width:100%}
a{color:inherit}
button{font:inherit;color:inherit}
table{border-collapse:collapse;width:100%}

:focus-visible{
  outline:2px solid var(--path);
  outline-offset:3px;
  border-radius:1px;
}

/* ---------- 通用容器与排版 ---------- */
.container{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}

.site-main{display:block;min-height:40vh}

.mono{font-family:var(--font-mono);letter-spacing:.02em}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--grass);
}
.eyebrow::before{
  content:"";
  width:20px;
  height:1px;
  background:var(--grass);
  flex:0 0 auto;
}

.prose{max-width:68ch}
.prose p{margin-bottom:1.4em}
.prose p:last-child{margin-bottom:0}
.prose h2{margin:2.2em 0 .7em}
.prose h3{margin:1.8em 0 .6em}
.prose ul,.prose ol{list-style:none;margin:0 0 1.4em;padding:0;display:grid;gap:10px}
.prose li{padding-left:22px;position:relative}
.prose li::before{
  content:"";
  position:absolute;
  left:0;
  top:.85em;
  width:10px;
  height:1px;
  background:var(--grass);
}

.slab{clip-path:polygon(0 0,100% 0,100% 78%,0 100%)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  height:44px;
  padding:0 22px;
  border:1px solid transparent;
  border-radius:var(--radius);
  font-size:15px;
  font-weight:600;
  text-decoration:none;
  cursor:pointer;
  transition:background-color 180ms var(--ease),border-color 180ms var(--ease),color 180ms var(--ease),transform 180ms var(--ease);
}
.btn-primary{background:var(--orange);border-color:var(--orange);color:#1B0E02}
.btn-primary:hover{background:var(--orange-deep);border-color:var(--orange-deep);color:var(--white)}
.btn-outline{background:var(--white);border-color:var(--ink);color:var(--ink)}
.btn-outline:hover{background:var(--ink);color:var(--white)}
.btn-ghost{background:transparent;border-color:var(--silver);color:var(--graphite)}
.btn-ghost:hover{border-color:var(--grass);color:var(--grass)}

/* ---------- 卡片与图片位 ---------- */
.card{
  border:var(--line);
  border-radius:var(--radius);
  background:var(--white);
  padding:24px;
  box-shadow:var(--shadow);
  transition:transform 180ms var(--ease),border-color 180ms var(--ease);
}
.card:hover{transform:translateY(-2px);border-color:var(--grass)}

.img-frame{
  display:block;
  position:relative;
  overflow:hidden;
  border:var(--line);
  border-radius:var(--radius);
  background:var(--mist);
  margin:0;
}
.img-frame img{display:block;width:100%;height:100%;object-fit:cover}
.img-frame--wide{aspect-ratio:16/9}
.img-frame--box{aspect-ratio:4/3}
.img-frame--tall{aspect-ratio:3/4}
.img-frame--sky{aspect-ratio:21/9}
.img-frame figcaption{
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  padding:10px 14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.04em;
  color:var(--graphite);
  background:rgba(255,255,255,.92);
  border-top:var(--line);
}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:22px 0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.02em;
  color:var(--graphite);
}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"/";color:var(--silver)}
.breadcrumb a{color:var(--graphite);text-decoration:none;transition:color 160ms var(--ease)}
.breadcrumb a:hover{color:var(--grass)}
.breadcrumb [aria-current="page"]{color:var(--ink);font-weight:600}

/* ---------- 页头 ---------- */
.skip-link{
  position:fixed;
  top:8px;
  left:8px;
  z-index:200;
  padding:10px 18px;
  background:var(--ink);
  color:var(--white);
  font-size:14px;
  font-weight:600;
  text-decoration:none;
  border-radius:var(--radius);
  transform:translateY(-200%);
  transition:transform 160ms var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.site-header{
  position:sticky;
  top:0;
  z-index:90;
  background:var(--white);
  border-bottom:var(--line);
  box-shadow:var(--shadow);
}

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

.command-bar{
  display:flex;
  align-items:center;
  gap:clamp(14px,2vw,30px);
  height:var(--header-h);
  max-width:1440px;
  margin:0 auto;
  padding:0 clamp(16px,3vw,40px);
  transition:height 180ms var(--ease);
}
.site-header.is-condensed .command-bar{height:48px}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  text-decoration:none;
  color:var(--ink);
}
.brand-mark{
  position:relative;
  display:grid;
  place-items:center;
  width:30px;
  height:30px;
  background:var(--grass);
  color:var(--white);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  line-height:1;
  border-radius:var(--radius);
  flex:0 0 auto;
}
.brand-mark::after{
  content:"";
  position:absolute;
  right:-3px;
  bottom:-3px;
  width:6px;
  height:6px;
  background:var(--orange);
}
.brand-text{display:flex;flex-direction:column;gap:1px;min-width:0}
.brand-name{
  font-size:16px;
  font-weight:900;
  letter-spacing:-.01em;
  line-height:1.15;
  white-space:nowrap;
}
.brand-tag{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.06em;
  line-height:1.2;
  color:var(--graphite);
  white-space:nowrap;
}

.brand-code{
  flex:0 0 auto;
  padding-left:14px;
  border-left:var(--line);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  color:var(--graphite);
  white-space:nowrap;
}

.primary-nav{
  display:flex;
  align-items:center;
  gap:clamp(12px,1.6vw,24px);
  flex:1 1 auto;
  min-width:0;
}

.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(12px,1.8vw,26px);
  min-width:0;
}
.nav-list a{
  position:relative;
  display:inline-block;
  padding:6px 0;
  font-size:15px;
  font-weight:400;
  color:var(--graphite);
  text-decoration:none;
  white-space:nowrap;
  transition:color 160ms var(--ease);
}
.nav-list a::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:var(--path);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform 180ms var(--ease);
}
.nav-list a:hover{color:var(--ink)}
.nav-list a:hover::after{transform:scaleX(1)}
.nav-list a[aria-current="page"]{color:var(--ink);font-weight:600}
.nav-list a[aria-current="page"]::after{transform:scaleX(1);background:var(--grass)}

.nav-note{
  margin-left:auto;
  padding-left:14px;
  border-left:var(--line);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.06em;
  color:var(--graphite);
  white-space:nowrap;
}
.site-header.is-condensed .brand-tag,
.site-header.is-condensed .brand-code,
.site-header.is-condensed .nav-note{display:none}

.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}

.btn-member{
  display:inline-flex;
  align-items:center;
  gap:8px;
  height:34px;
  padding:0 14px;
  border:1px solid var(--orange);
  border-radius:var(--radius);
  background:var(--white);
  color:var(--orange-deep);
  font-size:14px;
  font-weight:600;
  text-decoration:none;
  white-space:nowrap;
  transition:background-color 180ms var(--ease),border-color 180ms var(--ease),color 180ms var(--ease);
}
.btn-member::after{
  content:"→";
  font-family:var(--font-mono);
  font-size:13px;
  transition:transform 180ms var(--ease);
}
.btn-member:hover{background:var(--orange-deep);border-color:var(--orange-deep);color:var(--white)}
.btn-member:hover::after{transform:translateX(2px)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  height:34px;
  padding:0 12px;
  border:var(--line);
  border-radius:var(--radius);
  background:var(--white);
  color:var(--ink);
  font-size:13px;
  font-weight:600;
  cursor:pointer;
  transition:border-color 160ms var(--ease),color 160ms var(--ease);
}
.nav-toggle:hover{border-color:var(--grass);color:var(--grass)}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:16px;
  height:2px;
  background:currentColor;
  transition:background-color 160ms var(--ease);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:2px;
  background:currentColor;
  transition:transform 160ms var(--ease);
}
.nav-toggle-bars::before{top:-5px}
.nav-toggle-bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-5px) rotate(-45deg)}
.nav-toggle-label{white-space:nowrap}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--forest);
  color:#D8E4DE;
  border-top:4px solid var(--grass);
}
.footer-inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:44px var(--gutter) 36px;
}

.footer-feedback{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:16px 20px;
  border:1px solid rgba(201,209,217,.38);
  border-radius:var(--radius);
  background:rgba(31,122,77,.16);
  color:var(--white);
  font-size:15px;
  font-weight:600;
  text-decoration:none;
  transition:border-color 180ms var(--ease),background-color 180ms var(--ease);
}
.footer-feedback:hover{
  border-color:var(--orange);
  background:rgba(242,140,40,.14);
}
.footer-feedback-label{display:inline-block}
.footer-feedback-arrow{
  font-family:var(--font-mono);
  font-size:16px;
  color:var(--orange);
  transition:transform 180ms var(--ease);
}
.footer-feedback:hover .footer-feedback-arrow{transform:translateX(4px)}

.footer-grid{
  display:grid;
  grid-template-columns:1.2fr 1fr 1fr 1.3fr;
  gap:32px 40px;
  margin-top:44px;
}

.footer-mark{
  font-size:18px;
  font-weight:900;
  letter-spacing:-.01em;
  line-height:1.2;
  color:var(--white);
}
.footer-tagline{
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--path);
}
.footer-closing{
  margin-top:18px;
  max-width:24ch;
  font-size:13px;
  line-height:1.9;
  color:#9FB3AA;
}

.footer-heading{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--silver);
}

.footer-list{
  display:grid;
  gap:9px;
  font-size:14px;
  line-height:1.7;
}
.footer-list a{
  position:relative;
  display:inline-block;
  color:#D8E4DE;
  text-decoration:none;
  transition:color 160ms var(--ease);
}
.footer-list a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-1px;
  width:100%;
  height:1px;
  background:var(--orange);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform 180ms var(--ease);
}
.footer-list a:hover{color:var(--white)}
.footer-list a:hover::after{transform:scaleX(1)}

.footer-item{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:0 10px;
}
.footer-key{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.1em;
  color:var(--path);
}
.copy-btn{
  padding:0;
  border:0;
  border-bottom:1px dashed rgba(201,209,217,.42);
  background:none;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.02em;
  color:#D8E4DE;
  cursor:pointer;
  transition:color 160ms var(--ease),border-color 160ms var(--ease);
}
.copy-btn:hover{color:var(--white);border-bottom-color:var(--orange)}
.copy-hint{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.04em;
  color:var(--orange);
}

.footer-meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px 28px;
  margin-top:40px;
  padding-top:20px;
  border-top:1px solid rgba(201,209,217,.2);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.02em;
  color:#8FA79D;
}
.footer-legal{color:#9FB3AA}
.footer-copy{color:#8FA79D}

/* ---------- 页面外壳与会员中心栏 ---------- */
.page-shell{
  display:grid;
  grid-template-columns:minmax(0,1fr) 240px;
  gap:clamp(24px,4vw,56px);
  align-items:start;
  padding-top:32px;
  padding-bottom:72px;
}
.member-rail{
  position:sticky;
  top:calc(var(--header-h) + 24px);
  display:grid;
  gap:12px;
  padding:20px;
  border:var(--line);
  border-radius:var(--radius);
  background:var(--white);
  box-shadow:var(--shadow);
}
.member-rail h2{
  font-size:16px;
  font-weight:900;
  letter-spacing:-.01em;
  line-height:1.35;
}
.member-rail p{
  font-size:13px;
  line-height:1.75;
  color:var(--graphite);
}
.member-rail .btn{width:100%}

/* ---------- 响应式 ---------- */
@media (max-width:1279px){
  :root{--gutter:clamp(20px,4.5vw,64px)}
}

@media (max-width:1023px){
  .brand-code{display:none}
  .nav-note{display:none}
  .nav-list{gap:16px}
  .nav-list a{font-size:14px}
  .page-shell{grid-template-columns:minmax(0,1fr)}
  .member-rail{position:static;top:auto}
  .footer-grid{grid-template-columns:1fr 1fr}
}

@media (max-width:767px){
  .site-header.is-condensed .command-bar{height:var(--header-h)}
  .command-bar{gap:12px;padding:0 16px}
  .brand-tag{display:none}
  .header-actions{margin-left:auto}
  .nav-toggle{display:inline-flex}
  .btn-member{height:32px;padding:0 12px;font-size:13px}
  .btn-member::after{display:none}

  .primary-nav{
    position:fixed;
    left:0;
    right:0;
    top:var(--header-h);
    display:block;
    padding:6px 16px 16px;
    background:var(--white);
    border-top:var(--line);
    border-bottom:var(--line);
    box-shadow:0 12px 24px rgba(11,15,14,.08);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    visibility:hidden;
    opacity:0;
    transform:translateY(-6px);
    transition:opacity 200ms var(--ease),transform 200ms var(--ease),visibility 200ms var(--ease);
  }
  .primary-nav[data-open="true"]{
    visibility:visible;
    opacity:1;
    transform:translateY(0);
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list li{border-bottom:1px solid var(--mist)}
  .nav-list li:last-child{border-bottom:0}
  .nav-list a{display:block;padding:14px 2px;font-size:16px}
  .nav-list a::after{display:none}
  .nav-list a[aria-current="page"]{
    padding-left:12px;
    border-left:2px solid var(--grass);
  }

  .footer-inner{padding:32px 20px 28px}
  .footer-grid{grid-template-columns:1fr;gap:28px;margin-top:32px}
  .footer-closing{max-width:none}
  .footer-meta{flex-direction:column;align-items:flex-start;gap:8px;margin-top:28px}
  .footer-feedback{padding:14px 16px;font-size:14px}
  .page-shell{padding-top:20px;padding-bottom:52px}
}

@media (max-width:480px){
  body{font-size:15.5px;line-height:1.85}
  .brand-name{font-size:15px}
  .brand-mark{width:28px;height:28px;font-size:11px}
  .nav-toggle-label{display:none}
  .footer-meta{font-size:11px}
  .card{padding:18px}
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .card:hover{transform:none}
  .btn-member:hover::after{transform:none}
  .footer-feedback:hover .footer-feedback-arrow{transform:none}
  .header-progress span{transition:none}
}