*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
img,svg{display:block;max-width:100%}
h1,h2,h3,h4{font-weight:900;line-height:1.2}

:root{
  --ink:#0E2A24;
  --ink-soft:#14362E;
  --char:#14161A;
  --paper:#F2EBDD;
  --paper-deep:#E7DDCA;
  --claret:#8C2F39;
  --claret-deep:#74252D;
  --blue:#2E6F9E;
  --green:#2F7D5D;
  --red:#D7263D;
  --yellow:#F4C542;
  --mist:#F7F4EC;
  --graphite:#5A615F;
  --rail-w:88px;
  --gutter:clamp(16px,4vw,44px);
  --maxw:1280px;
  --ease:cubic-bezier(.2,.7,.3,1);
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
@media (max-width:1023px){:root{--rail-w:0px}}

body{
  background:var(--paper);
  color:var(--char);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  padding-left:var(--rail-w);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

:where(a,button,summary,[tabindex]):focus-visible{
  outline:3px solid var(--claret);
  outline-offset:2px;
  border-radius:2px;
}
.site-head :focus-visible,
.site-foot :focus-visible{outline-color:var(--yellow)}
#main-content:focus{outline:none}
.site-main{display:block}

/* ============ HEADER ============ */
.site-head{
  position:sticky;
  top:0;
  z-index:120;
  margin-left:calc(-1 * var(--rail-w));
  background:var(--ink);
  color:var(--mist);
  box-shadow:0 1px 0 rgba(247,244,236,.16),0 12px 28px -24px rgba(0,0,0,.9);
}
.site-head::before{
  content:"";
  display:block;
  height:4px;
  background:linear-gradient(90deg,var(--blue) 0 20%,var(--mist) 20% 40%,var(--red) 40% 60%,var(--green) 60% 80%,var(--yellow) 80% 100%);
}
@media (min-width:768px){.site-head::before{display:none}}

.skip-link{
  position:absolute;
  left:50%;
  top:-120px;
  transform:translateX(-50%);
  z-index:999;
  display:inline-block;
  padding:12px 22px;
  background:var(--yellow);
  color:var(--char);
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  border-radius:2px;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:10px}

/* 品牌轨道 */
.head-rail{display:none}
@media (min-width:1024px){
  .head-rail{
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:26px;
    position:fixed;
    top:0;
    bottom:0;
    left:0;
    width:var(--rail-w);
    z-index:100;
    background:var(--ink);
    padding:140px 0 30px;
  }
  .head-rail::after{
    content:"";
    position:absolute;
    top:0;right:0;bottom:0;
    width:4px;
    background:linear-gradient(180deg,var(--blue) 0 20%,var(--mist) 20% 40%,var(--red) 40% 60%,var(--green) 60% 80%,var(--yellow) 80% 100%);
    opacity:.92;
  }
}
.rail-mark{
  writing-mode:vertical-rl;
  text-orientation:upright;
  font-family:var(--font-display);
  font-weight:900;
  font-size:15px;
  letter-spacing:.42em;
  color:rgba(247,244,236,.86);
  line-height:1;
}
.rail-legend{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  margin-top:auto;
}
.rail-legend-item{display:flex;flex-direction:column;align-items:center;gap:8px}
.rail-legend-text{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-weight:300;
  font-size:11px;
  letter-spacing:.2em;
  color:rgba(247,244,236,.55);
}
.dot{display:inline-block;width:9px;height:9px;border-radius:50%;flex:none}
.dot--red{background:var(--red);box-shadow:0 0 0 3px rgba(215,38,61,.18)}
.dot--yellow{background:var(--yellow);box-shadow:0 0 0 3px rgba(244,197,66,.18)}

/* 顶部双层导航 */
.head-main{display:block}
.head-top{
  display:flex;
  align-items:center;
  gap:16px;
  flex-wrap:nowrap;
  min-height:60px;
  padding-block:10px;
  padding-inline:calc(var(--rail-w) + var(--gutter)) var(--gutter);
}
.brand{display:flex;flex-direction:column;gap:2px;min-width:0}
.brand-name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:19px;
  letter-spacing:-.01em;
  line-height:1.15;
  color:var(--mist);
  white-space:nowrap;
}
.brand-name-latin{
  font-family:var(--font-mono);
  font-weight:300;
  font-size:12px;
  letter-spacing:.22em;
  margin-left:8px;
  color:var(--yellow);
}
.brand-tagline{
  font-size:11px;
  letter-spacing:.16em;
  color:rgba(247,244,236,.6);
  white-space:nowrap;
}
.head-utility{
  margin-inline-start:auto;
  font-family:var(--font-mono);
  font-weight:300;
  font-size:11px;
  letter-spacing:.22em;
  color:rgba(247,244,236,.55);
  white-space:nowrap;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin-inline-start:auto;
  padding:10px 14px;
  border:1px solid rgba(247,244,236,.28);
  border-radius:2px;
  color:var(--mist);
  font-size:12px;
  letter-spacing:.18em;
}
.nav-toggle-bars{display:inline-flex;flex-direction:column;justify-content:space-between;width:20px;height:14px}
.nav-toggle-bars span{display:block;height:2px;width:100%;background:currentColor;transition:transform .2s var(--ease),opacity .2s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle-label{white-space:nowrap}

.head-nav{background:var(--char);border-top:1px solid rgba(247,244,236,.08)}
.nav-list{
  display:flex;
  align-items:stretch;
  gap:2px;
  min-height:52px;
  padding-inline:calc(var(--rail-w) + var(--gutter)) var(--gutter);
  overflow-x:auto;
  scrollbar-width:none;
  -ms-overflow-style:none;
}
.nav-list::-webkit-scrollbar{display:none}
.nav-item{display:flex;flex:none}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  padding:0 16px;
  font-size:14px;
  letter-spacing:.08em;
  color:rgba(247,244,236,.78);
  white-space:nowrap;
  transition:color .2s ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:16px;right:16px;bottom:0;
  height:3px;
  background:var(--yellow);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .24s var(--ease);
}
.nav-link:hover{color:var(--mist)}
.nav-link:hover::after{transform:scaleX(1);background:var(--claret)}
.nav-link[aria-current="page"]{color:var(--paper);font-weight:700}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--yellow)}

.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:3px;
  background:rgba(247,244,236,.1);
  pointer-events:none;
}
.scroll-progress-bar{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--yellow),var(--red) 55%,var(--claret));
}

@keyframes navIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

@media (max-width:767px){
  .head-utility{display:none}
  .nav-toggle{display:inline-flex}
  .head-nav{display:none;border-top:1px solid rgba(247,244,236,.1)}
  .head-nav[data-open]{display:block;animation:navIn .2s var(--ease) both}
  .nav-list{
    flex-direction:column;
    min-height:0;
    padding:6px var(--gutter) 18px;
    overflow:visible;
  }
  .nav-item{display:block}
  .nav-link{
    width:100%;
    padding:14px 4px;
    font-size:15px;
    border-bottom:1px solid rgba(247,244,236,.12);
  }
  .nav-link::after{left:4px;right:auto;width:38px;bottom:8px;height:2px}
  .brand-tagline{font-size:10px;letter-spacing:.12em}
}

/* ============ FOOTER ============ */
.site-foot{
  position:relative;
  margin-top:clamp(56px,9vw,110px);
  background:var(--char);
  color:rgba(247,244,236,.78);
}
.site-foot::before{
  content:"";
  display:block;
  height:6px;
  background:linear-gradient(90deg,var(--blue) 0 20%,var(--mist) 20% 40%,var(--red) 40% 60%,var(--green) 60% 80%,var(--yellow) 80% 100%);
}
.foot-top{
  display:grid;
  gap:clamp(28px,4vw,52px);
  max-width:var(--maxw);
  margin-inline:auto;
  padding:clamp(36px,5vw,64px) var(--gutter);
}
@media (min-width:900px){
  .foot-top{grid-template-columns:5fr 7fr;align-items:start}
}
.foot-brand{display:flex;flex-direction:column;gap:14px}
.foot-wordmark{
  font-family:var(--font-display);
  font-weight:900;
  font-size:26px;
  letter-spacing:-.02em;
  color:var(--mist);
}
.foot-wordmark-latin{
  font-family:var(--font-mono);
  font-weight:200;
  font-size:14px;
  letter-spacing:.28em;
  margin-left:10px;
  color:var(--yellow);
}
.foot-desc{
  font-size:14px;
  line-height:1.85;
  color:rgba(247,244,236,.7);
  max-width:36ch;
}
.foot-flag{display:flex;gap:5px}
.flag-seg{display:block;width:30px;height:4px;border-radius:1px}
.flag-seg--blue{background:var(--blue)}
.flag-seg--white{background:var(--mist)}
.flag-seg--red{background:var(--red)}
.flag-seg--green{background:var(--green)}
.flag-seg--yellow{background:var(--yellow)}

.foot-cols{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:26px 20px;
}
@media (min-width:640px){.foot-cols{grid-template-columns:repeat(3,minmax(0,1fr))}}
.foot-col{display:flex;flex-direction:column;gap:12px}
.foot-col-title{
  font-family:var(--font-mono);
  font-weight:300;
  font-size:11px;
  letter-spacing:.24em;
  color:var(--yellow);
  text-transform:uppercase;
}
.foot-list{display:flex;flex-direction:column;gap:9px}
.foot-link{
  font-size:14px;
  color:rgba(247,244,236,.78);
  border-bottom:1px solid transparent;
  padding-bottom:1px;
  transition:color .2s ease,border-color .2s ease;
}
.foot-link:hover{color:var(--mist);border-bottom-color:var(--yellow)}

.foot-contact{
  max-width:var(--maxw);
  margin:0 auto;
  padding:20px var(--gutter);
  background:var(--ink);
  border-top:1px solid rgba(247,244,236,.12);
  border-bottom:1px solid rgba(247,244,236,.12);
  display:flex;
  flex-direction:column;
  gap:6px;
}
.foot-contact-line{
  font-family:var(--font-mono);
  font-weight:300;
  font-size:13px;
  letter-spacing:.04em;
  color:var(--mist);
  word-break:break-word;
}
.foot-contact-note{
  font-size:12px;
  line-height:1.7;
  color:rgba(247,244,236,.55);
  max-width:62ch;
}

.foot-base{
  max-width:var(--maxw);
  margin:0 auto;
  padding:22px var(--gutter) 34px;
  display:flex;
  flex-wrap:wrap;
  gap:8px 24px;
  justify-content:space-between;
  align-items:center;
}
.foot-meta{
  font-family:var(--font-mono);
  font-weight:300;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--graphite);
}
@media (max-width:599px){
  .foot-base{flex-direction:column;align-items:flex-start;gap:6px}
}

/* ============ LAYOUT UTILITIES ============ */
.shell{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.eyebrow{
  font-family:var(--font-mono);
  font-weight:300;
  font-size:12px;
  letter-spacing:.26em;
  color:var(--graphite);
  text-transform:uppercase;
}
.rule{
  width:96px;
  height:4px;
  border:0;
  background:linear-gradient(90deg,var(--blue) 0 20%,var(--mist) 20% 40%,var(--red) 40% 60%,var(--green) 60% 80%,var(--yellow) 80% 100%);
}

/* ============ BUTTONS ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 24px;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:700;
  letter-spacing:.08em;
  line-height:1.2;
  border:1px solid transparent;
  border-radius:2px;
  cursor:pointer;
  transition:transform .2s var(--ease),background-color .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.btn--sm{padding:9px 16px;font-size:12px;letter-spacing:.12em}
.btn--primary{background:var(--claret);color:var(--paper)}
.btn--primary:hover{background:var(--claret-deep);transform:translateY(-2px);box-shadow:0 10px 22px -16px rgba(20,22,26,.9)}
.btn--ghost{background:transparent;color:var(--ink);border-color:rgba(14,42,36,.34)}
.btn--ghost:hover{background:var(--ink);color:var(--paper);border-color:var(--ink);transform:translateY(-2px)}
.btn--onink{background:var(--yellow);color:var(--char)}
.btn--onink:hover{background:var(--mist);transform:translateY(-2px)}

/* ============ BREADCRUMB ============ */
.breadcrumb{
  font-family:var(--font-mono);
  font-weight:300;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--graphite);
}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li{display:flex;align-items:center}
.breadcrumb li+li::before{content:"/";margin-right:8px;color:var(--graphite);opacity:.55}
.breadcrumb a{color:inherit;border-bottom:1px solid transparent;transition:border-color .2s ease,color .2s ease}
.breadcrumb a:hover{color:var(--claret);border-bottom-color:currentColor}

/* ============ SECTION HEAD ============ */
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  gap:10px 20px;
  padding-bottom:16px;
  border-bottom:2px solid var(--ink);
  margin-bottom:clamp(22px,3vw,36px);
}
.section-index{
  font-family:var(--font-mono);
  font-weight:200;
  font-size:clamp(52px,8vw,112px);
  line-height:.78;
  letter-spacing:-.05em;
  color:var(--claret);
  flex:none;
}
.section-title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(21px,2.8vw,32px);
  letter-spacing:-.02em;
  color:var(--ink);
  line-height:1.1;
}
.section-kicker{
  margin-inline-start:auto;
  font-size:13px;
  color:var(--graphite);
  max-width:38ch;
}

/* ============ GRID ============ */
.grid{display:grid;gap:clamp(18px,2.6vw,32px)}
@media (min-width:900px){
  .grid--7-5{grid-template-columns:7fr 5fr}
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
}

/* ============ CARDS ============ */
.card{
  background:var(--mist);
  border:1px solid rgba(20,22,26,.13);
  border-radius:2px;
  padding:clamp(18px,2.4vw,28px);
  transition:transform .24s var(--ease),border-color .24s ease,box-shadow .24s ease;
}
.card:hover{transform:translateY(-4px);border-color:rgba(20,22,26,.3);box-shadow:0 14px 30px -22px rgba(20,22,26,.7)}
.card--dark{background:var(--ink);color:var(--mist);border-color:rgba(247,244,236,.16)}
.card--dark:hover{border-color:rgba(247,244,236,.4)}
.card--glass{
  background:rgba(247,244,236,.08);
  border:1px solid rgba(247,244,236,.24);
  -webkit-backdrop-filter:blur(9px);
  backdrop-filter:blur(9px);
  color:var(--mist);
}

/* ============ MEDIA ============ */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  border-radius:2px;
  background:var(--char);
}
.media img,
.media picture,
.media video{width:100%;height:100%;object-fit:cover;display:block}
.media--16-9{aspect-ratio:16/9}
.media--4-3{aspect-ratio:4/3}
.media--1-1{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
.media-shade{
  position:absolute;
  inset:0;
  background:linear-gradient(160deg,var(--ink-soft) 0%,var(--char) 62%,#0b0d10 100%);
  opacity:.95;
}
.media-caption{
  margin-top:8px;
  font-family:var(--font-mono);
  font-weight:300;
  font-size:12px;
  letter-spacing:.08em;
  color:var(--graphite);
}

/* ============ TAGS ============ */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  font-size:11px;
  font-weight:700;
  letter-spacing:.14em;
  border:1px solid currentColor;
  border-radius:2px;
  line-height:1.4;
}
.tag--red{color:var(--red)}
.tag--blue{color:var(--blue)}
.tag--green{color:var(--green)}
.tag--yellow{background:var(--ink);color:var(--yellow);border-color:transparent}

/* ============ PROSE ============ */
.prose{
  max-width:68ch;
  font-size:17px;
  line-height:1.78;
  color:var(--char);
}
.prose p+p{margin-top:1em}
.prose h2{
  margin-top:2em;
  margin-bottom:.6em;
  font-family:var(--font-display);
  font-size:clamp(20px,2.4vw,26px);
  letter-spacing:-.01em;
  color:var(--ink);
}
.prose h3{
  margin-top:1.6em;
  margin-bottom:.5em;
  font-size:18px;
  color:var(--claret);
}
.prose ul,.prose ol{margin:1em 0;padding-left:1.3em;list-style:disc}
.prose ol{list-style:decimal}
.prose li+li{margin-top:.4em}
.prose strong{font-weight:900;color:var(--ink)}
.prose a{border-bottom:1px solid var(--blue);color:var(--blue)}
.prose a:hover{background:rgba(46,111,158,.1)}

/* ============ REVEAL ============ */
html.js [data-reveal]{opacity:0;transform:translateY(14px)}
html.js [data-reveal].is-revealed{
  opacity:1;
  transform:none;
  transition:opacity .55s ease,transform .55s var(--ease);
}

/* ============ MOTION ============ */
@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;
  }
  html.js [data-reveal]{opacity:1;transform:none;transition:none}
  .card:hover,.btn:hover{transform:none}
  .scroll-progress-bar{transition:none}
}