:root{
  --paper:#F6F1E4;
  --paper-shade:#EDE6D3;
  --ink:#14261C;
  --ink-soft:#2E4638;
  --apple:#8FD14F;
  --apple-strong:#4FBF3A;
  --gold:#C99A2E;
  --gold-deep:#7A5C12;
  --cream:#FFFDF7;
  --clay:#B85C3C;
  --deep:#0B1712;
  --line:#C9C2AC;
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;
  --shell:1200px;
  --gutter:clamp(20px,5vw,80px);
  --radius-sm:12px;
  --radius:18px;
  --radius-lg:22px;
  --ease:cubic-bezier(.2,.7,.3,1);
  --shadow-soft:0 22px 48px -32px rgba(11,23,18,.6);
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
::selection{background:var(--apple);color:var(--ink);}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,address{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
img,svg,video,canvas{max-width:100%;display:block;}
a{color:inherit;}
button{font:inherit;color:inherit;background:none;border:0;}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{
  outline:3px solid var(--apple-strong);
  outline-offset:3px;
  border-radius:6px;
}
.visually-hidden{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0;
}
.shell{
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding-inline:var(--gutter);
}
.skip-link{
  position:absolute;left:14px;top:-72px;z-index:200;
  display:inline-flex;align-items:center;min-height:44px;
  padding:10px 20px;border-radius:0 0 14px 14px;
  background:var(--ink);color:var(--paper);
  font-size:14px;text-decoration:none;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:0;}

/* ---------- 头部 ---------- */
.site-header{position:relative;z-index:60;background:var(--paper);}
.header-utility{
  display:flex;align-items:center;
  gap:clamp(10px,1.6vw,20px);
  min-height:82px;padding-block:15px;
}
.header-identity{display:flex;align-items:center;gap:12px;min-width:0;}
.brand{
  display:inline-flex;align-items:center;gap:12px;
  min-height:44px;text-decoration:none;color:var(--ink);
}
.brand__mark{
  position:relative;flex:none;width:36px;height:36px;
  border-radius:50% 50% 48% 52% / 52% 50% 50% 48%;
  background:radial-gradient(circle at 34% 28%,#CBEA80 0%,var(--apple) 46%,#58992C 100%);
  box-shadow:inset 0 -8px 13px -7px rgba(11,23,18,.65);
}
.brand__mark::before{
  content:"";position:absolute;top:-7px;left:20px;
  width:15px;height:8px;background:var(--ink);
  border-radius:100% 0 100% 0;transform:rotate(-18deg);
}
.brand__mark::after{
  content:"";position:absolute;top:-5px;left:17px;
  width:2px;height:9px;border-radius:2px;background:var(--ink-soft);
}
.brand__stack{display:flex;flex-direction:column;line-height:1.22;}
.brand__name{
  font-family:var(--font-serif);font-weight:700;font-size:21px;
  letter-spacing:.04em;color:var(--ink);
}
.brand__suffix{
  font-family:var(--font-mono);font-size:11px;
  letter-spacing:.14em;color:var(--ink-soft);text-transform:uppercase;
}
.version-chip{
  display:inline-flex;align-items:center;height:26px;padding:0 11px;
  border:1px dashed var(--gold);border-radius:999px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--gold-deep);white-space:nowrap;
}
.header-tools{margin-left:auto;display:flex;align-items:center;gap:8px;}
.tool-link{
  display:inline-flex;align-items:center;gap:9px;
  min-height:44px;padding:0 17px;border-radius:999px;
  border:1px solid transparent;
  font-size:14.5px;font-weight:500;letter-spacing:.02em;
  text-decoration:none;color:var(--ink);
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.tool-link:hover{background:var(--paper-shade);border-color:var(--line);}
.tool-link--search{padding-inline:16px;}
.tool-link__icon{
  position:relative;flex:none;width:13px;height:13px;
  border:2px solid currentColor;border-radius:50%;
}
.tool-link__icon::after{
  content:"";position:absolute;right:-4px;bottom:-3px;
  width:7px;height:2px;border-radius:2px;background:currentColor;
  transform:rotate(45deg);
}
.tool-link__text{white-space:nowrap;}
.tool-link--solid{
  background:var(--apple-strong);color:#0E1F16;font-weight:600;
  padding-inline:20px;
}
.tool-link--solid:hover{background:#43AC30;border-color:transparent;}
.nav-toggle{
  display:none;align-items:center;gap:9px;
  min-height:44px;padding:0 15px;border-radius:999px;
  border:1px solid var(--line);background:var(--cream);
  color:var(--ink);cursor:pointer;
  transition:background-color .2s var(--ease);
}
.nav-toggle:hover{background:var(--paper-shade);}
.nav-toggle__text{font-size:14px;letter-spacing:.04em;}
.nav-toggle__icon{position:relative;flex:none;width:18px;height:12px;}
.nav-toggle__icon::before,.nav-toggle__icon::after{
  content:"";position:absolute;left:0;width:18px;height:2px;
  border-radius:2px;background:currentColor;
  transition:transform .24s var(--ease),box-shadow .24s var(--ease);
}
.nav-toggle__icon::before{top:0;box-shadow:0 5px 0 currentColor;}
.nav-toggle__icon::after{bottom:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before{
  box-shadow:0 0 0 currentColor;transform:translateY(5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after{
  transform:translateY(-5px) rotate(-45deg);
}
.header-nav{position:relative;background:var(--ink);color:var(--paper);}
.header-nav__inner{display:flex;align-items:center;gap:18px;min-height:58px;}
.site-nav__label{
  flex:none;padding-right:18px;
  border-right:1px solid rgba(201,194,172,.32);
  font-family:var(--font-mono);font-size:11px;line-height:1;
  letter-spacing:.18em;color:var(--gold);text-transform:uppercase;
}
.site-nav{min-width:0;}
.site-nav__list{display:flex;align-items:center;gap:clamp(2px,1.4vw,22px);}
.site-nav__item{flex:none;}
.site-nav__link{
  display:inline-flex;align-items:center;gap:7px;
  min-height:44px;padding:6px;
  border-bottom:2px solid transparent;
  color:rgba(246,241,228,.76);text-decoration:none;
  font-size:15px;letter-spacing:.02em;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.site-nav__link:hover{color:var(--paper);}
.site-nav__num{
  font-family:var(--font-mono);font-size:10.5px;
  letter-spacing:.06em;color:var(--gold);opacity:.85;
}
.site-nav__text{white-space:nowrap;}
.site-nav__link[aria-current="page"]{
  color:var(--apple);border-bottom-color:var(--apple-strong);
}
.site-nav__link[aria-current="page"] .site-nav__num{color:var(--apple);opacity:1;}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,9vw,120px);
  background:var(--deep);color:var(--paper);
}
.site-footer::before{
  content:"";display:block;height:9px;
  background:repeating-linear-gradient(90deg,var(--gold) 0 1px,transparent 1px 18px);
  opacity:.5;
}
.footer-top{padding-block:clamp(44px,6vw,76px) clamp(28px,4vw,44px);}
.footer-grid{
  display:grid;gap:clamp(28px,4vw,54px);
  grid-template-columns:1.5fr 1fr 1fr 1.4fr;
}
.footer-col{min-width:0;}
.footer-brand__name{
  font-family:var(--font-serif);font-weight:700;font-size:23px;
  letter-spacing:.04em;color:var(--paper);
}
.footer-brand__meta{
  margin-top:7px;
  font-family:var(--font-mono);font-size:11px;
  letter-spacing:.16em;color:var(--apple);
}
.footer-text{
  margin-top:15px;max-width:27em;
  font-size:14px;line-height:1.8;color:rgba(246,241,228,.66);
}
.footer-title{
  margin-bottom:14px;padding-bottom:12px;
  border-bottom:1px solid rgba(201,194,172,.22);
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.2em;color:var(--gold);
}
.footer-list{display:flex;flex-direction:column;gap:2px;}
.footer-link{
  display:inline-flex;align-items:center;min-height:40px;
  font-size:14.5px;color:rgba(246,241,228,.78);text-decoration:none;
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer-link:hover{color:var(--apple);transform:translateX(3px);}
.footer-col--contact{min-width:0;}
.footer-contact{
  font-style:normal;font-size:14px;line-height:1.8;
  color:rgba(246,241,228,.72);
}
.footer-contact p + p{margin-top:9px;}
.footer-contact__value{color:var(--paper);word-break:break-word;}
.footer-bottom{border-top:1px solid rgba(201,194,172,.18);}
.footer-bottom__inner{
  display:flex;flex-wrap:wrap;align-items:center;
  gap:8px 28px;padding-block:18px;
}
.footer-note{
  font-family:var(--font-mono);font-size:12px;
  letter-spacing:.06em;color:rgba(246,241,228,.56);
}

/* ---------- 排版基元 ---------- */
.display-title{
  font-family:var(--font-serif);font-weight:700;
  font-size:clamp(34px,5vw,64px);line-height:1.18;letter-spacing:.01em;
  color:var(--ink);
}
.section-title{
  font-family:var(--font-serif);font-weight:600;
  font-size:clamp(24px,3vw,34px);line-height:1.32;color:var(--ink);
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;
  letter-spacing:.16em;color:var(--gold-deep);text-transform:uppercase;
}
.page-shell{
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding-inline:var(--gutter);
}
.prose{max-width:36em;font-size:17px;line-height:1.85;color:var(--ink-soft);}
.prose p + p{margin-top:1em;}
.prose a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--line);text-underline-offset:4px;}

/* ---------- 通用组件 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:48px;padding:12px 26px;border-radius:999px;
  border:1px solid transparent;
  font-family:var(--font-sans);font-size:15px;font-weight:600;letter-spacing:.02em;
  text-decoration:none;cursor:pointer;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn--primary{background:var(--apple-strong);color:#0E1F16;}
.btn--primary:hover{background:#43AC30;transform:translateY(-1px);}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--ink);}
.btn--ghost:hover{background:var(--ink);color:var(--paper);}
.btn--quiet{background:var(--cream);color:var(--ink);border-color:var(--line);}
.btn--quiet:hover{background:var(--paper-shade);}
.breadcrumb{font-size:13px;color:var(--ink-soft);}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:6px;}
.breadcrumb__list li + li::before{content:"/";margin-inline-end:6px;color:var(--line);}
.breadcrumb__list a{
  color:inherit;text-decoration:none;
  border-bottom:1px dashed var(--line);
}
.breadcrumb__list a:hover{border-bottom-color:var(--apple-strong);color:var(--ink);}
.card{
  background:var(--cream);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(20px,3vw,28px);
}
.frame{
  position:relative;
  border:1px solid var(--ink);
  border-radius:var(--radius-lg);
  background:var(--cream);
  padding:clamp(20px,3.4vw,36px);
  box-shadow:var(--shadow-soft);
}
.frame::before{
  content:"";position:absolute;inset:8px;pointer-events:none;
  border:1px solid rgba(201,194,172,.65);
  border-radius:calc(var(--radius-lg) - 6px);
}
.tick-rule{
  height:10px;border:0;margin-block:clamp(24px,4vw,40px);
  background:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 16px);
}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:999px;
  border:1px solid var(--line);background:var(--paper-shade);
  font-family:var(--font-mono);font-size:12px;
  letter-spacing:.08em;color:var(--ink-soft);
}
.tag--accent{background:var(--apple);border-color:transparent;color:var(--ink);}
.tag--clay{
  background:rgba(184,92,60,.12);
  border-color:rgba(184,92,60,.32);
  color:var(--clay);
}
.grid{display:grid;gap:clamp(18px,2.4vw,28px);}
.grid--two{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--three{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--split{grid-template-columns:minmax(0,2fr) minmax(0,1fr);}
.media{
  position:relative;display:block;
  aspect-ratio:4 / 3;
  overflow:hidden;
  border-radius:var(--radius-lg);
  background:
    radial-gradient(circle at 30% 26%,rgba(143,209,79,.55),transparent 60%),
    var(--paper-shade);
}
.media img,.media picture,.media video{
  width:100%;height:100%;object-fit:cover;display:block;
}
.media--wide{aspect-ratio:16 / 9;}
.media--tall{aspect-ratio:3 / 4;}
.media--square{aspect-ratio:1 / 1;}
.media--frame{
  outline:1px solid var(--line);
  outline-offset:6px;
}
.js-reveal [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .42s var(--ease),transform .42s var(--ease);
}
.js-reveal [data-reveal].is-visible{opacity:1;transform:none;}
.js-reveal [data-reveal][data-reveal-delay="1"]{transition-delay:.07s;}
.js-reveal [data-reveal][data-reveal-delay="2"]{transition-delay:.14s;}
.js-reveal [data-reveal][data-reveal-delay="3"]{transition-delay:.21s;}
.js-reveal [data-reveal][data-reveal-delay="4"]{transition-delay:.28s;}
.scroll-route{
  position:fixed;top:0;left:0;right:0;height:3px;
  z-index:150;pointer-events:none;
}
.scroll-route__fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--apple-strong),var(--apple),var(--gold));
  transition:width .12s linear;
}

/* ---------- 响应式：平板 ---------- */
@media (max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,40px);}
  .footer-col--brand{grid-column:1 / -1;}
  .grid--three{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex;}
  .header-utility{min-height:66px;padding-block:11px;}
  .brand__mark{width:32px;height:32px;}
  .brand__name{font-size:19px;}
  .header-nav{min-height:54px;}
  .header-nav__inner{display:block;min-height:0;padding-inline:0;}
  .site-nav__label{display:none;}
  .site-nav{
    overflow-x:auto;overscroll-behavior-x:contain;
    scrollbar-width:none;
  }
  .site-nav::-webkit-scrollbar{display:none;}
  .site-nav__list{
    display:flex;flex-wrap:nowrap;align-items:center;
    gap:20px;width:max-content;min-width:100%;
    min-height:54px;padding-inline:var(--gutter);
  }
  .site-nav__link{padding-block:14px;font-size:14px;}
  .site-nav[data-open]{
    position:absolute;left:0;right:0;top:100%;z-index:70;
    max-height:calc(100vh - 120px);
    max-height:calc(100dvh - 120px);
    overflow:auto;
    background:var(--deep);
    border-radius:0 0 var(--radius-lg) var(--radius-lg);
    box-shadow:0 34px 64px -34px rgba(0,0,0,.75);
    padding-block:6px 26px;
  }
  .site-nav[data-open] .site-nav__list{
    flex-direction:column;align-items:stretch;gap:0;
    width:auto;min-width:0;min-height:0;
    padding-inline:var(--gutter);
  }
  .site-nav[data-open] .site-nav__link{
    display:flex;gap:16px;
    padding:17px 0;
    font-family:var(--font-serif);font-size:20px;font-weight:600;
    color:var(--paper);
    border-bottom:1px solid rgba(201,194,172,.2);
  }
  .site-nav[data-open] .site-nav__num{font-size:12px;color:var(--gold);}
  .site-nav[data-open] .site-nav__link[aria-current="page"]{
    color:var(--apple);
    border-bottom-color:rgba(201,194,172,.2);
  }
  .grid--split{grid-template-columns:minmax(0,1fr);}
  .grid--two{grid-template-columns:minmax(0,1fr);}
}
/* ---------- 响应式：手机 ---------- */
@media (max-width:640px){
  body{font-size:16px;}
  .version-chip{display:none;}
  .tool-link--solid{display:none;}
  .tool-link--search{padding-inline:14px;}
  .tool-link--search .tool-link__text{
    position:absolute;width:1px;height:1px;padding:0;margin:-1px;
    overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0;
  }
  .brand__suffix{font-size:10px;}
  .footer-grid{grid-template-columns:minmax(0,1fr);}
  .grid--three{grid-template-columns:minmax(0,1fr);}
  .footer-bottom__inner{gap:6px 20px;}
}
@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-reveal [data-reveal]{opacity:1;transform:none;}
  .footer-link:hover{transform:none;}
  .btn:hover{transform:none;}
}