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

/* ========== 2. 变量 ========== */
:root{
  --deep-ink:#08251C;
  --forest:#0E3B2E;
  --ridge:#16483A;
  --edge:#1F6B54;
  --mint:#3DF5C0;
  --mint-tint:#8FFADD;
  --sand:#E8DCC8;
  --paper:#F5EEE2;
  --violet:#6C5CE7;
  --violet-tint:#A79BF2;
  --mist:#9CB8AC;
  --night:#06180F;

  --rail-w:220px;
  --content:1160px;
  --pad-x:clamp(18px,3.2vw,44px);
  --radius:2px;
  --dur:320ms;
  --ease:cubic-bezier(.2,.7,.3,1);

  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ========== 3. 基础与中文排版 ========== */
body{
  background-color:var(--forest);
  background-image:
    linear-gradient(to right,rgba(61,245,192,.05) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(61,245,192,.05) 1px,transparent 1px);
  background-size:72px 72px;
  color:var(--sand);
  font-family:var(--font-body);
  font-size:1rem;
  font-weight:400;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.12;
  color:var(--paper);
}
h1{font-size:clamp(2rem,4vw,3.4rem);line-height:1.02}
h2{font-size:clamp(1.4rem,2.4vw,2rem);line-height:1.15}
h3{font-size:clamp(1.1rem,1.6vw,1.35rem)}
p{max-width:68ch}
strong,b{font-weight:700;color:var(--paper)}
small{font-size:.875rem;line-height:1.6}
:focus-visible{outline:2px solid var(--mint);outline-offset:3px;border-radius:1px}
::selection{background:var(--mint);color:var(--night)}
body.nav-open{overflow:hidden}

.skip-link{
  position:fixed;top:10px;left:10px;z-index:999;
  transform:translateY(-260%);
  background:var(--mint);color:var(--night);
  font-weight:700;font-size:.875rem;
  padding:10px 18px;border-radius:var(--radius);
  transition:transform 180ms var(--ease);
}
.skip-link:focus-visible{transform:translateY(0);outline-offset:2px}

/* ========== 4. 头部：品牌轨道 ========== */
.site-header{position:relative;z-index:40}

.header-track{background:var(--deep-ink);border-bottom:1px solid var(--edge)}
.header-track__inner{
  max-width:var(--content);margin-inline:auto;
  padding:15px var(--pad-x);
  display:flex;align-items:center;gap:18px;flex-wrap:wrap;
}
.brand{display:inline-flex;align-items:center;gap:12px;flex-wrap:wrap}
.brand__mark{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(1.02rem,1.4vw,1.22rem);
  letter-spacing:.2em;color:var(--sand);
}
.brand__badge{
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.16em;line-height:1;
  padding:5px 8px;color:var(--mint);
  border:1px solid var(--edge);border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(61,245,192,.1),rgba(61,245,192,0));
  transform:rotate(-2deg);
  transition:transform 200ms var(--ease),border-color 200ms var(--ease);
}
.brand:hover .brand__badge,.brand:focus-visible .brand__badge{transform:rotate(0) translateY(-2px);border-color:var(--mint)}

.header-track__meta{
  display:none;
  margin-inline-start:auto;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;color:var(--mist);
  max-width:none;
}
.header-track__meta-item{white-space:nowrap}
.header-track__meta-item + .header-track__meta-item::before{
  content:"·";margin-inline-end:10px;color:var(--edge);
}

.nav-toggle{
  margin-inline-start:auto;
  display:inline-flex;align-items:center;gap:9px;
  padding:8px 13px;border:1px solid var(--edge);border-radius:var(--radius);
  background:var(--ridge);color:var(--sand);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.14em;
  transition:background 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease);
}
.nav-toggle:hover{border-color:var(--mint-tint);color:var(--mint-tint)}
.nav-toggle[aria-expanded="true"]{background:var(--mint);border-color:var(--mint);color:var(--night)}
.nav-toggle__bars{
  display:inline-block;width:16px;height:2px;background:currentColor;
  box-shadow:0 -5px 0 currentColor,0 5px 0 currentColor;
  transition:box-shadow 200ms var(--ease),transform 200ms var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{
  box-shadow:0 -4px 0 currentColor,0 4px 0 currentColor;
  transform:scaleX(.62);
}

/* ========== 5. 栏目索引 ========== */
.site-nav{background:var(--forest);border-bottom:1px solid var(--edge);position:relative}
.site-nav__scroll{
  max-width:var(--content);margin-inline:auto;
  padding-inline:var(--pad-x);
  overflow-x:auto;overflow-y:hidden;
  scrollbar-width:thin;scrollbar-color:var(--edge) transparent;
}
.site-nav__scroll::-webkit-scrollbar{height:4px}
.site-nav__scroll::-webkit-scrollbar-thumb{background:var(--edge)}
.site-nav__list{display:flex;flex-direction:column;gap:0;padding-block:4px}
.site-nav__item{display:block}
.site-nav__link{
  position:relative;
  display:flex;align-items:baseline;gap:9px;
  padding:14px 0;
  font-size:.98rem;font-weight:500;letter-spacing:.02em;color:var(--sand);
  border-bottom:1px solid rgba(31,107,84,.55);
  transition:color 180ms var(--ease);
}
.site-nav__idx{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;color:var(--mist);transition:color 180ms var(--ease)}
.site-nav__link::after{
  content:"";position:absolute;left:0;bottom:9px;
  width:26px;height:2px;background:var(--mint);
  transform:scaleX(0);transform-origin:left;
  transition:transform 240ms var(--ease);
}
.site-nav__link:hover,.site-nav__link:focus-visible{color:var(--mint-tint)}
.site-nav__link:hover::after,.site-nav__link:focus-visible::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--mint);font-weight:700}
.site-nav__link[aria-current="page"] .site-nav__idx{color:var(--mint)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}

/* ========== 6. 左侧轨道 ========== */
.rail{display:flex;flex-direction:column;gap:18px;padding:20px var(--pad-x) 30px}
.rail__head{display:flex;flex-direction:column;gap:10px}
.rail__mark{
  display:inline-flex;align-items:center;width:100%;
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.22em;color:var(--mint);
  padding-bottom:10px;border-bottom:1px solid var(--edge);
}
.rail__group{display:flex;flex-direction:column;gap:8px}
.rail__eyebrow{
  display:block;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--mist);
}
.device-switch{display:flex;flex-direction:column;gap:6px}
.device-switch__btn{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:9px 12px;
  border:1px solid var(--edge);border-radius:var(--radius);
  background:var(--ridge);color:var(--sand);
  font-size:.84rem;font-weight:500;text-align:left;
  transition:background 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease);
}
.device-switch__btn::after{content:"○";font-family:var(--font-mono);font-size:.66rem;color:var(--edge)}
.device-switch__btn:hover{border-color:var(--mint-tint);color:var(--mint-tint)}
.device-switch__btn[aria-pressed="true"]{background:var(--mint);border-color:var(--mint);color:var(--night);font-weight:700}
.device-switch__btn[aria-pressed="true"]::after{content:"●";color:var(--night)}
.rail__hint{
  font-size:.78rem;line-height:1.65;color:var(--mist);
  border-left:2px solid var(--edge);padding-left:10px;max-width:none;
}
.rail__cta{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 14px;
  background:var(--mint);color:var(--night);
  font-size:.86rem;font-weight:700;letter-spacing:.02em;
  border:1px solid var(--mint);border-radius:var(--radius);
  transition:background 180ms var(--ease),color 180ms var(--ease),transform 180ms var(--ease);
}
.rail__cta:hover,.rail__cta:focus-visible{background:transparent;color:var(--mint);transform:translateY(-2px)}
.rail__link{
  align-self:flex-start;
  display:inline-flex;align-items:center;gap:6px;
  font-size:.8rem;color:var(--mint-tint);
  border-bottom:1px solid rgba(61,245,192,.32);padding-bottom:2px;
  transition:color 180ms var(--ease),border-color 180ms var(--ease);
}
.rail__link::after{content:"→";font-family:var(--font-mono);font-size:.72rem}
.rail__link:hover,.rail__link:focus-visible{color:var(--mint);border-color:var(--mint)}
.rail__note{
  margin-top:6px;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.14em;color:var(--mist);
}

/* 移动端抽屉形态 */
@media (max-width:1023.98px){
  .site-nav{
    position:fixed;inset:0;z-index:100;
    background:var(--forest);
    border-bottom:0;
    overflow-y:auto;-webkit-overflow-scrolling:touch;
    padding:calc(20px + env(safe-area-inset-top)) 0 calc(32px + env(safe-area-inset-bottom));
  }
  .js .site-nav[data-open="false"]{display:none}
  .site-nav__scroll{overflow:visible}
  .site-nav__list{padding-block:0}
  .rail{padding-top:24px;border-top:1px solid var(--edge);margin-top:20px}
}

/* ========== 7. 桌面：左侧常驻轨道 ========== */
@media (min-width:720px){
  .header-track__meta{display:flex;align-items:center;gap:10px}
}
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .nav-toggle{display:none}
  .header-track__meta{margin-inline-start:auto}

  .site-nav,.js .site-nav[data-open="false"]{
    position:static;display:block;inset:auto;
    overflow:visible;background:var(--forest);border-bottom:1px solid var(--edge);
    padding:0;z-index:auto;
  }
  .site-nav__scroll{overflow-x:auto;overflow-y:hidden}
  .site-nav__list{flex-direction:row;gap:2px;padding-block:0}
  .site-nav__link{
    display:inline-flex;align-items:baseline;
    padding:15px 15px;
    font-size:.92rem;border-bottom:0;white-space:nowrap;
  }
  .site-nav__link::after{left:15px;bottom:8px;width:auto;right:15px}

  .rail{
    position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:60;
    padding:26px 18px 26px;
    gap:20px;
    background:var(--deep-ink);
    border-right:1px solid var(--edge);
    border-top:0;margin-top:0;
    overflow-y:auto;
  }
  .rail__note{
    margin-top:auto;
    writing-mode:vertical-rl;transform:rotate(180deg);
    align-self:flex-start;
    max-height:200px;
  }
}

/* ========== 8. 页脚 ========== */
.site-footer{
  background:var(--deep-ink);
  border-top:1px solid var(--edge);
  margin-top:clamp(48px,8vw,104px);
  color:var(--sand);
}
.footer-grid{
  max-width:var(--content);margin-inline:auto;
  padding:clamp(34px,5vw,64px) var(--pad-x) clamp(24px,3vw,36px);
  display:grid;grid-template-columns:1fr;gap:clamp(22px,3vw,34px);
}
.footer-block{
  position:relative;
  display:flex;flex-direction:column;gap:12px;
  padding-top:18px;
  border-top:1px solid rgba(31,107,84,.7);
}
.footer-block::before{
  content:"";position:absolute;top:-1px;left:0;
  width:38px;height:1px;background:var(--mint);
}
.footer-block--brand{gap:14px}
.footer-block--legal{gap:10px}
.footer-brand{
  font-family:var(--font-display);font-weight:900;
  font-size:1.05rem;letter-spacing:.14em;color:var(--paper);
  max-width:none;
}
.footer-line{font-size:.86rem;line-height:1.7;color:var(--mist);max-width:36ch}
.footer-line--muted{font-size:.8rem;color:rgba(156,184,172,.85)}
.footer-title{
  font-family:var(--font-mono);font-weight:500;
  font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;color:var(--mint);
}
.footer-list{display:flex;flex-direction:column;gap:9px;font-size:.86rem}
.footer-list li{display:flex;flex-wrap:wrap;align-items:baseline;gap:0 8px}
.footer-list a{
  color:var(--sand);
  border-bottom:1px solid transparent;padding-bottom:1px;
  transition:color 180ms var(--ease),border-color 180ms var(--ease);
}
.footer-list a:hover,.footer-list a:focus-visible{color:var(--mint);border-color:var(--mint)}
.footer-key{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;
  color:var(--mist);min-width:2.6em;
}
.footer-val{font-size:.86rem;line-height:1.8;color:var(--sand);word-break:break-word;max-width:32ch}
.footer-link{
  align-self:flex-start;
  display:inline-flex;align-items:center;gap:6px;
  font-size:.82rem;color:var(--mint-tint);
  border-bottom:1px solid rgba(61,245,192,.3);padding-bottom:2px;
  transition:color 180ms var(--ease),border-color 180ms var(--ease);
}
.footer-link::after{content:"→";font-family:var(--font-mono);font-size:.72rem}
.footer-link:hover,.footer-link:focus-visible{color:var(--mint);border-color:var(--mint)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  display:inline-flex;align-items:center;
  padding:6px 11px;
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.04em;
  color:var(--mint-tint);
  border:1px solid var(--edge);border-radius:var(--radius);
  background:rgba(22,72,58,.65);
  transition:transform 200ms var(--ease),background 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease);
}
.footer-chips .chip:nth-child(1){transform:rotate(-1.5deg)}
.footer-chips .chip:nth-child(2){transform:rotate(1deg)}
.footer-chips .chip:nth-child(3){transform:rotate(-.8deg)}
.chip:hover,.chip:focus-visible{
  transform:translateY(-2px) rotate(0);
  background:var(--mint);color:var(--night);border-color:var(--mint);
}
.footer-base{
  max-width:var(--content);margin-inline:auto;
  padding:16px var(--pad-x) 30px;
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;
  border-top:1px solid rgba(31,107,84,.5);
}
.footer-copy{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;
  color:var(--mist);max-width:none;
}
.footer-copy--mono{color:rgba(156,184,172,.8)}

@media (min-width:720px){
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .footer-block--brand{grid-column:span 2}
}
@media (min-width:1024px){
  .footer-grid{grid-template-columns:1.5fr 1fr 1.35fr 1.2fr;gap:30px}
  .footer-block--brand{grid-column:auto}
}

/* ========== 9. 通用版式 ========== */
.container{width:100%;max-width:var(--content);margin-inline:auto;padding-inline:var(--pad-x)}
.section{padding-block:clamp(40px,6.5vw,88px)}
.prose{max-width:68ch;font-size:1rem;line-height:1.75;color:var(--sand)}
.prose > * + *{margin-top:1em}
.prose h2,.prose h3{margin-top:1.6em;color:var(--paper)}
.prose ul,.prose ol{list-style:disc;padding-left:1.3em;max-width:68ch}
.prose ol{list-style:decimal}
.prose a{color:var(--mint-tint);border-bottom:1px solid rgba(61,245,192,.35)}
.prose a:hover{color:var(--mint);border-color:var(--mint)}

.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--mist);
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--mint);flex:0 0 auto}
.num{
  font-family:var(--font-mono);font-feature-settings:"tnum" 1;
  letter-spacing:-.01em;line-height:1;color:var(--mint);
}
.vertical-note{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.14em;color:var(--mist);
}

/* ========== 10. 按钮 ========== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 22px;
  font-size:.92rem;font-weight:700;letter-spacing:.02em;
  background:var(--mint);color:var(--night);
  border:1px solid var(--mint);border-radius:var(--radius);
  transition:background 180ms var(--ease),color 180ms var(--ease),transform 180ms var(--ease);
}
.btn:hover,.btn:focus-visible{background:transparent;color:var(--mint);transform:translateY(-2px)}
.btn--ghost{background:transparent;color:var(--mint-tint);border-color:var(--edge)}
.btn--ghost:hover,.btn--ghost:focus-visible{background:var(--mint);border-color:var(--mint);color:var(--night)}
.btn--violet{background:var(--violet);border-color:var(--violet);color:var(--paper)}
.btn--violet:hover,.btn--violet:focus-visible{background:transparent;color:var(--violet-tint);border-color:var(--violet)}
.btn-row{display:flex;flex-wrap:wrap;gap:12px}

/* ========== 11. 标签 / 卡片 ========== */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;
  color:var(--mint);
  border:1px solid var(--edge);border-radius:var(--radius);
  background:rgba(22,72,58,.55);
}
.tag--violet{color:var(--violet-tint);border-color:rgba(108,92,231,.6);background:rgba(108,92,231,.16)}
.tag--sand{color:var(--sand);border-color:rgba(232,220,200,.3)}
.card{
  background:var(--ridge);
  border:1px solid var(--edge);border-radius:var(--radius);
  padding:clamp(18px,2.4vw,28px);
}
.card--paper{background:var(--paper);color:var(--forest);border-color:var(--paper)}
.card--paper h2,.card--paper h3,.card--paper .card__title{color:var(--night)}
.card--paper p{color:var(--night)}

/* ========== 12. 网格 ========== */
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--12{grid-template-columns:repeat(4,1fr)}
@media (min-width:720px){
  .grid--12{grid-template-columns:repeat(8,1fr)}
}
@media (min-width:1024px){
  .grid--12{grid-template-columns:repeat(12,1fr)}
  .span-4{grid-column:span 4}
  .span-5{grid-column:span 5}
  .span-6{grid-column:span 6}
  .span-7{grid-column:span 7}
  .span-8{grid-column:span 8}
  .span-12{grid-column:span 12}
}

/* ========== 13. 面包屑 ========== */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-block:16px;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;
  color:var(--mist);
}
.breadcrumb a{color:var(--mint-tint);border-bottom:1px solid transparent;transition:color 160ms var(--ease),border-color 160ms var(--ease)}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--mint);border-color:var(--mint)}
.breadcrumb__sep{color:var(--edge)}
.breadcrumb [aria-current="page"]{color:var(--sand)}

/* ========== 14. 图片容器基础规则 ========== */
.media-frame{
  position:relative;overflow:hidden;
  width:100%;aspect-ratio:16/10;
  background:var(--ridge);
  border:1px solid var(--edge);border-radius:var(--radius);
}
.media-frame > img,
.media-frame > svg,
.media-frame > picture > img{
  width:100%;height:100%;object-fit:cover;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame > figcaption{
  position:absolute;left:0;right:0;bottom:0;
  padding:10px 14px;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;
  color:var(--sand);
  background:linear-gradient(180deg,rgba(8,37,28,0),rgba(8,37,28,.86));
}

/* ========== 15. 滚动显现协议 ========== */
.js [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.js [data-reveal].is-visible{opacity:1;transform:none}

/* ========== 16. Reduced motion ========== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    transition-delay:0ms !important;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .brand__badge,.footer-chips .chip{transform:none}
}