/* ========== 1. reset ========== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,address{margin:0}
ul,ol{padding:0}
ul[class],ol[class]{list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit}
table{border-collapse:collapse;width:100%}

/* ========== 2. 设计令牌 ========== */
:root{
  --felt:#1F4D3A;
  --felt-deep:#123328;
  --felt-light:#2A6149;
  --cream:#F7EFDF;
  --paper:#FFF9EE;
  --ink:#241A12;
  --ink-soft:#4B3A2B;
  --wood:#B77A45;
  --wood-deep:#6A4228;
  --dice:#C43C32;
  --chip:#D8A544;
  --teal:#1F6F6D;
  --teal-deep:#164F4D;
  --rail-w:274px;
  --r-lg:26px;
  --r-md:16px;
  --r-pill:999px;
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;
  --sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:"IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,"Courier New",monospace;
  --line:rgba(106,66,40,.22);
  --shadow-soft:0 18px 40px -28px rgba(18,51,40,.7);
  --shadow-plate:0 4px 0 rgba(106,66,40,.32);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ========== 3. 基础排版与画布 ========== */
body{
  min-height:100vh;
  background-color:var(--cream);
  background-image:
    radial-gradient(140% 90% at 100% 0%, rgba(216,165,68,.10) 0%, rgba(216,165,68,0) 55%),
    radial-gradient(90% 60% at 0% 100%, rgba(31,111,109,.07) 0%, rgba(31,111,109,0) 60%);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5{font-family:var(--serif);font-weight:700;line-height:1.3;letter-spacing:-.01em;color:var(--ink)}
h1{font-size:clamp(28px,4.4vw,44px)}
h2{font-size:clamp(22px,3vw,30px)}
h3{font-size:clamp(18px,2.2vw,22px)}
h4{font-size:clamp(16px,1.8vw,18px)}
main p{max-width:38em}
strong{font-weight:700}
code,kbd,samp{font-family:var(--mono);font-size:.92em}
hr{border:0;border-top:1px solid var(--line);margin:clamp(24px,3vw,36px) 0}
::selection{background:var(--chip);color:var(--felt-deep)}
:focus-visible{outline:3px solid var(--teal);outline-offset:3px;border-radius:6px}
#main-content{scroll-margin-top:24px}
main{padding-block:clamp(22px,3.4vw,44px) 0}

/* ========== 4. 布局工具 ========== */
.wrap{width:100%;max-width:1180px;margin-inline:auto;padding-inline:clamp(18px,4vw,52px)}
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(216px,1fr))}

/* ========== 5. 跳过链接 ========== */
.skip-link{
  position:absolute;left:18px;top:-90px;z-index:200;
  padding:10px 20px;border-radius:0 0 16px 16px;
  background:var(--chip);color:#2A1B0C;
  font-weight:700;font-size:14px;text-decoration:none;
  box-shadow:0 6px 18px -10px rgba(18,51,40,.9);
  transition:top .2s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{top:0;outline:3px solid var(--teal);outline-offset:2px}

/* ========== 6. 侧边轨道页头 ========== */
.site-header{position:relative;z-index:60}
.rail{
  position:relative;
  display:flex;flex-direction:column;
  gap:clamp(16px,2.4vw,26px);
  padding:22px 20px 18px;
  color:var(--cream);
  background-color:var(--felt);
  background-image:
    repeating-linear-gradient(48deg, rgba(255,249,238,.045) 0 2px, rgba(255,249,238,0) 2px 8px),
    radial-gradient(130% 80% at 50% -10%, #2F6E53 0%, var(--felt) 46%, var(--felt-deep) 100%);
  border-bottom:3px solid var(--wood-deep);
}
.rail__top{position:relative;z-index:80;display:flex;align-items:center;justify-content:space-between;gap:14px}

/* 品牌 */
.brand{
  display:grid;
  grid-template-columns:auto 1fr;
  grid-template-rows:auto auto;
  column-gap:11px;row-gap:1px;
  align-items:center;
  text-decoration:none;color:var(--cream);
  min-width:0;
}
.brand__mark{
  grid-column:1;grid-row:1 / span 2;
  display:grid;place-items:center;
  width:38px;height:38px;
  border-radius:13px;
  background:var(--chip);color:var(--felt-deep);
  font-size:19px;line-height:1;
  box-shadow:inset 0 -3px 0 rgba(106,66,40,.35);
}
.brand__name{
  grid-column:2;grid-row:1;
  font-family:var(--serif);font-weight:700;
  font-size:16px;line-height:1.3;letter-spacing:.02em;
}
.brand__tagline{
  grid-column:2;grid-row:2;
  font-size:11.5px;line-height:1.5;letter-spacing:.08em;
  color:#C6DECB;
}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;gap:9px;
  padding:8px 15px 8px 13px;
  border:1.5px solid rgba(247,239,223,.45);
  border-radius:var(--r-pill);
  color:var(--cream);
  font-size:13px;letter-spacing:.08em;
  transition:background-color .18s var(--ease),border-color .18s var(--ease);
}
.nav-toggle:hover{background:rgba(247,239,223,.12);border-color:var(--chip)}
.nav-toggle__bars{display:grid;gap:3px;width:16px}
.nav-toggle__bars span{
  display:block;height:2px;border-radius:2px;background:currentColor;
  transition:transform .22s var(--ease),opacity .18s var(--ease);
}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__text{white-space:nowrap}

/* 导航 */
.site-nav{display:flex;flex-direction:column;gap:14px;min-height:0}
.site-nav__label{
  font-family:var(--mono);
  font-size:10.5px;letter-spacing:.18em;
  color:var(--chip);text-transform:uppercase;
}
.nav-list{display:flex;flex-direction:column;gap:3px}
.nav-list__item{min-width:0}
.nav-link{
  position:relative;
  display:grid;grid-template-columns:auto 1fr;
  align-items:baseline;column-gap:11px;
  padding:10px 30px 10px 12px;
  border:1px solid transparent;
  border-radius:15px;
  color:#DCEBDF;text-decoration:none;
  font-size:14.5px;letter-spacing:.02em;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.nav-link__num{
  font-family:var(--mono);
  font-size:11.5px;letter-spacing:.06em;
  color:rgba(216,165,68,.85);
  transition:color .18s var(--ease);
}
.nav-link__label{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nav-link:hover,.nav-link:focus-visible{
  background:rgba(247,239,223,.10);
  border-color:rgba(216,165,68,.42);
  color:var(--paper);
}
.nav-link:hover .nav-link__num{color:var(--chip)}
.nav-link[aria-current="page"]{
  background:var(--paper);
  border-color:var(--paper);
  color:var(--felt-deep);
  font-weight:700;
  box-shadow:var(--shadow-plate);
  transform:translateY(-1px);
}
.nav-link[aria-current="page"] .nav-link__num{color:var(--wood-deep)}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;right:13px;top:50%;
  width:8px;height:8px;border-radius:50%;
  background:var(--dice);transform:translateY(-50%);
}

/* 轨道 CTA */
.rail-cta{
  display:inline-flex;align-items:center;justify-content:center;
  margin-top:4px;padding:11px 16px;
  border-radius:var(--r-pill);
  background:var(--chip);color:#2A1B0C;
  font-size:14px;font-weight:700;letter-spacing:.02em;text-decoration:none;
  border:1px solid #A97C2C;
  box-shadow:0 3px 0 var(--wood-deep);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background-color .18s var(--ease);
}
.rail-cta:hover,.rail-cta:focus-visible{
  background:#E5B157;
  transform:translateY(-1px);
  box-shadow:0 5px 0 var(--wood-deep);
}
.rail-cta:active{transform:translateY(1px);box-shadow:0 1px 0 var(--wood-deep)}

/* 轨道脚注与进度 */
.rail__foot{margin-top:auto;display:grid;gap:10px}
.rail__note{
  font-size:12px;line-height:1.6;letter-spacing:.04em;
  color:#A9C4B3;
  border-left:2px solid rgba(216,165,68,.55);
  padding-left:9px;max-width:22em;
}
.rail-progress{
  height:4px;border-radius:2px;overflow:hidden;
  background:rgba(247,239,223,.18);
}
.rail-progress__fill{
  display:block;height:100%;width:0;
  border-radius:2px;
  background:linear-gradient(90deg,var(--chip),var(--dice));
}
.nav-scrim{display:none}

/* ========== 7. 移动端抽屉 ========== */
@media (max-width:1023px){
  body{font-size:15.5px}
  .site-header{position:sticky;top:0;z-index:70}
  .rail{
    padding:11px 16px 10px;
    gap:8px;
    box-shadow:0 12px 26px -22px rgba(18,51,40,.95);
  }
  .nav-toggle{display:inline-flex}
  .brand__name{font-size:15px}
  .brand__tagline{font-size:10.5px;letter-spacing:.05em}
  .brand__mark{width:34px;height:34px;border-radius:11px;font-size:17px}

  .site-nav{
    position:fixed;top:0;right:0;bottom:0;
    width:min(360px,88vw);
    z-index:75;
    display:flex;flex-direction:column;gap:16px;
    padding:88px 22px 34px;
    overflow-y:auto;
    background:linear-gradient(180deg,var(--felt-deep),#0E2A20);
    border-left:3px solid var(--wood-deep);
    box-shadow:-24px 0 46px -24px rgba(0,0,0,.8);
    transform:translateX(103%);
    visibility:hidden;
    transition:transform .28s var(--ease),visibility .28s linear;
  }
  .site-header[data-open] .site-nav{transform:translateX(0);visibility:visible}
  .site-nav__label{color:var(--chip)}
  .nav-link{padding:13px 34px 13px 14px;font-size:16px;border-radius:16px}
  .nav-link__num{font-size:12.5px}
  .rail-cta{margin-top:6px;padding:13px 18px;font-size:15px}
  .nav-scrim{
    display:block;
    position:fixed;inset:0;z-index:72;
    background:rgba(11,34,26,.6);
    opacity:0;visibility:hidden;
    transition:opacity .28s var(--ease),visibility .28s linear;
  }
  .site-header[data-open] .nav-scrim{opacity:1;visibility:visible}
  .rail__foot{margin-top:0;gap:0}
  .rail__note{display:none}
  .rail-progress{height:3px;margin-top:7px;background:rgba(247,239,223,.22)}
  #main-content{scroll-margin-top:96px}
  body.nav-is-open{overflow:hidden}
}

/* ========== 8. 页脚 ========== */
.site-footer{
  position:relative;
  margin-top:clamp(46px,7vw,92px);
  color:var(--cream);
  background-color:var(--felt-deep);
  background-image:
    repeating-linear-gradient(48deg, rgba(255,249,238,.035) 0 2px, rgba(255,249,238,0) 2px 9px),
    radial-gradient(120% 90% at 80% -20%, #1D4A38 0%, var(--felt-deep) 55%, #0C2419 100%);
}
.site-footer::before{
  content:"";display:block;height:9px;
  background:repeating-linear-gradient(90deg,var(--wood) 0 14px,#9C6635 14px 28px,var(--wood-deep) 28px 32px);
}
.footer-top{
  display:grid;gap:clamp(26px,4vw,46px);
  grid-template-columns:1fr;
  padding-block:clamp(34px,5vw,60px) clamp(26px,3.4vw,40px);
}
.footer-brand{display:grid;gap:12px;align-content:start}
.footer-brand__name{
  font-family:var(--serif);font-weight:700;
  font-size:clamp(20px,2.6vw,25px);line-height:1.3;
  color:var(--paper);text-decoration:none;
  border-bottom:2px solid transparent;
  justify-self:start;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.footer-brand__name:hover,.footer-brand__name:focus-visible{color:var(--chip);border-bottom-color:var(--chip)}
.footer-brand__summary{font-size:14px;line-height:1.7;color:#C3DAC9;max-width:30ch}
.footer-brand__seal{
  font-size:14px;letter-spacing:.55em;color:rgba(216,165,68,.8);
}
.footer-cols{
  display:grid;gap:22px 18px;
  grid-template-columns:repeat(auto-fit,minmax(118px,1fr));
}
.footer-col{display:grid;gap:10px;align-content:start}
.footer-col__title{
  font-family:var(--mono);
  font-size:11.5px;font-weight:400;
  letter-spacing:.16em;color:var(--chip);
  padding-bottom:8px;
  border-bottom:1px solid rgba(216,165,68,.32);
}
.footer-list{display:grid;gap:2px}
.footer-list a{
  position:relative;display:inline-block;
  padding-block:4px;
  font-size:14.5px;color:#E3EDE2;text-decoration:none;
  transition:color .18s var(--ease);
}
.footer-list a::after{
  content:"";position:absolute;left:0;bottom:1px;height:1px;width:0;
  background:var(--chip);
  transition:width .22s var(--ease);
}
.footer-list a:hover,.footer-list a:focus-visible{color:var(--chip)}
.footer-list a:hover::after,.footer-list a:focus-visible::after{width:100%}
.footer-contact{display:grid;gap:9px;align-content:start}
.footer-contact__row{display:grid;gap:1px}
.footer-contact__label{
  font-family:var(--mono);
  font-size:10.5px;letter-spacing:.14em;color:var(--chip);
}
.footer-contact__value{
  font-size:14px;color:#E9F0E5;
  overflow-wrap:anywhere;
}
.footer-contact__note{
  margin-top:6px;
  font-size:12px;line-height:1.7;color:#A3BFAE;
  border-left:2px solid rgba(216,165,68,.55);
  padding-left:10px;
}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:8px 24px;
  align-items:center;justify-content:space-between;
  padding-block:15px 26px;
  border-top:1px solid rgba(247,239,223,.16);
}
.footer-legal{
  font-family:var(--mono);
  font-size:11.5px;letter-spacing:.02em;
  color:#9CB6A5;
}
.site-header :focus-visible,.site-footer :focus-visible{outline-color:var(--chip)}

/* ========== 9. 通用组件 ========== */
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--mono);
  font-size:11.5px;letter-spacing:.16em;
  color:var(--teal);
}
.eyebrow::before{content:"";width:20px;height:2px;border-radius:1px;background:var(--chip)}

.section-head{display:grid;gap:8px;margin-bottom:clamp(16px,2.6vw,28px)}
.section-head__title{font-family:var(--serif);font-size:clamp(21px,2.8vw,28px);line-height:1.32}
.section-head__meta{font-size:13px;letter-spacing:.03em;color:var(--wood-deep)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;
  border-radius:var(--r-pill);
  border:2px solid transparent;
  font-size:14.5px;font-weight:700;letter-spacing:.02em;
  text-decoration:none;cursor:pointer;
  box-shadow:0 3px 0 rgba(36,26,18,.16);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn:hover{transform:translateY(-1px);box-shadow:0 5px 0 rgba(36,26,18,.2)}
.btn:active{transform:translateY(1px);box-shadow:0 1px 0 rgba(36,26,18,.2)}
.btn--primary{background:var(--teal);color:var(--cream);border-color:var(--teal-deep)}
.btn--primary:hover{background:#24807D}
.btn--ghost{background:transparent;color:var(--felt-deep);border-color:var(--wood);box-shadow:none}
.btn--ghost:hover{background:rgba(183,122,69,.14);border-color:var(--wood-deep)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 11px;
  border-radius:var(--r-pill);
  border:1px solid rgba(106,66,40,.32);
  background:var(--paper);color:var(--wood-deep);
  font-size:11.5px;letter-spacing:.08em;line-height:1.6;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background-color .18s var(--ease);
}
.tag--wood{
  background:var(--wood-deep);color:var(--cream);
  border-color:var(--wood-deep);
  box-shadow:inset 0 -2px 0 rgba(0,0,0,.18);
}
a.tag:hover,a.tag:focus-visible{transform:translateY(-1px);box-shadow:var(--shadow-plate)}

.crumbs{
  font-family:var(--mono);
  font-size:12px;letter-spacing:.03em;
  color:var(--wood-deep);
  margin-bottom:clamp(14px,2vw,22px);
}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.crumbs li{display:flex;align-items:center;gap:8px}
.crumbs li + li::before{content:"›";color:var(--wood);font-size:14px;line-height:1}
.crumbs a{color:var(--teal);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .18s var(--ease)}
.crumbs a:hover,.crumbs a:focus-visible{border-bottom-color:currentColor}
.crumbs [aria-current="page"]{color:var(--ink);font-family:var(--sans);letter-spacing:.02em}

.text-link{
  position:relative;
  color:var(--teal);font-weight:600;text-decoration:none;
}
.text-link::after{
  content:"";position:absolute;left:0;right:100%;bottom:-2px;
  height:2px;border-radius:1px;background:var(--chip);
  transition:right .22s var(--ease);
}
.text-link:hover::after,.text-link:focus-visible::after{right:0}

.note{
  border-left:3px solid var(--wood);
  border-radius:0 var(--r-md) var(--r-md) 0;
  background:rgba(183,122,69,.10);
  padding:13px 17px;
  font-size:14px;line-height:1.75;color:var(--ink-soft);
}
.note__label{
  display:block;
  font-family:var(--mono);
  font-size:10.5px;letter-spacing:.14em;
  color:var(--wood-deep);margin-bottom:4px;
}

/* 图片容器基础规则 */
.figure{display:grid;gap:8px;margin:0}
.figure__frame{
  position:relative;
  border-radius:var(--r-lg);
  overflow:hidden;
  aspect-ratio:16 / 10;
  border:3px solid var(--wood-deep);
  box-shadow:var(--shadow-soft);
  background-color:var(--felt);
  background-image:
    repeating-linear-gradient(48deg, rgba(255,249,238,.05) 0 2px, rgba(255,249,238,0) 2px 8px),
    radial-gradient(120% 110% at 18% 0%, #2F7256 0%, var(--felt) 52%, var(--felt-deep) 100%);
}
.figure__img{width:100%;height:100%;object-fit:cover}
.figure__cap{
  font-size:12.5px;line-height:1.7;letter-spacing:.02em;
  color:var(--wood-deep);
  padding-left:10px;
  border-left:2px solid var(--chip);
}
.figure--tall .figure__frame{aspect-ratio:4 / 5}
.figure--square .figure__frame{aspect-ratio:1 / 1}
.figure--wide .figure__frame{aspect-ratio:21 / 9}

/* ========== 10. 显现 ========== */
[data-reveal].is-pending{opacity:0;transform:translateY(10px)}
[data-reveal].is-in{opacity:1;transform:none;transition:opacity .55s var(--ease),transform .55s var(--ease)}

/* ========== 11. 平板与桌面 ========== */
@media (min-width:768px){
  .footer-top{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .site-header{
    position:fixed;top:0;left:0;bottom:0;
    width:var(--rail-w);
  }
  .rail{
    height:100%;
    overflow-y:auto;
    padding:26px 20px 22px;
    border-bottom:0;
    border-right:3px solid var(--wood-deep);
    border-image:linear-gradient(180deg,var(--wood),var(--wood-deep) 40%,var(--wood)) 1;
  }
  .site-nav{flex:1 1 auto;overflow-y:auto;padding-right:2px}
  .nav-toggle{display:none}
  .nav-scrim{display:none}
  .footer-top{grid-template-columns:1.15fr 1.7fr 1fr;align-items:start}
  .footer-brand{grid-column:auto}
  .rail::-webkit-scrollbar{width:6px}
  .rail::-webkit-scrollbar-thumb{background:rgba(216,165,68,.45);border-radius:3px}
}
@media (min-width:1280px){
  :root{--rail-w:288px}
}

/* ========== 12. 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;
  }
  [data-reveal].is-pending{opacity:1;transform:none}
  .btn:hover,.rail-cta:hover,.tag:hover,.nav-link[aria-current="page"]{transform:none}
}