/* ========== 01. reset ========== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img,picture,svg{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
main{display:block}
#main-content{scroll-margin-top:104px}
:focus-visible{outline:2px solid var(--gold-soft);outline-offset:3px}

/* ========== 02. tokens ========== */
:root{
  --ink:#0E1B33;
  --ink-2:#182A4E;
  --gold:#E3B24B;
  --gold-soft:#F6D98A;
  --cinnabar:#D2503C;
  --jade:#2E8C7A;
  --moss:#6E8B5A;
  --stone:#A8B0BF;
  --paper:#F3EFE6;
  --char:#070C18;
  --line:rgba(168,176,191,.26);
  --line-strong:rgba(168,176,191,.52);
  --shell:1240px;
  --fs-xs:12px;
  --fs-sm:14px;
  --fs-body:17px;
  --fs-md:clamp(20px,2.1vw,24px);
  --fs-lg:clamp(28px,3.6vw,40px);
  --fs-xl:clamp(38px,6.4vw,72px);
  --sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ========== 03. base ========== */
body{
  font-family:var(--sans);
  font-size:var(--fs-body);
  font-weight:400;
  line-height:1.85;
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    radial-gradient(circle, rgba(243,239,230,.34) 0 .6px, transparent .9px),
    radial-gradient(900px 560px at 78% -10%, rgba(227,178,75,.16), transparent 62%),
    radial-gradient(720px 520px at 0% 6%, rgba(46,140,122,.14), transparent 60%),
    radial-gradient(760px 460px at 50% 104%, rgba(24,42,78,.92), transparent 72%);
  background-size:36px 36px,auto,auto,auto;
  background-repeat:repeat,no-repeat,no-repeat,no-repeat;
  min-height:100vh;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-weight:900;line-height:1.18;letter-spacing:-.01em;color:var(--paper)}
h1{font-size:var(--fs-xl)}
h2{font-size:var(--fs-lg)}
h3{font-size:var(--fs-md);font-weight:700;line-height:1.45}
::selection{background:var(--gold);color:var(--char)}

/* ========== 04. 通用布局 ========== */
.shell{width:min(var(--shell),100% - 40px);margin-inline:auto}
.section{padding-block:clamp(40px,7vw,88px)}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2.4vw,32px)}
.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}
@media (max-width:900px){
  .span-4,.span-5,.span-6,.span-7,.span-8{grid-column:span 6}
}
@media (max-width:640px){
  .span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:1 / -1}
}

/* ========== 05. 文字零件 ========== */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:var(--fs-xs);letter-spacing:.2em;
  text-transform:uppercase;color:var(--gold);
}
.eyebrow::before{content:"";width:20px;height:1px;background:currentColor}
.coord{font-family:var(--mono);font-size:var(--fs-xs);letter-spacing:.1em}
.note-v{
  writing-mode:vertical-rl;
  font-family:var(--mono);font-size:var(--fs-xs);
  letter-spacing:.22em;text-transform:uppercase;
  color:var(--stone);
}
.prose{max-width:34em;font-size:var(--fs-body);line-height:1.85;color:rgba(243,239,230,.87)}
.prose p + p{margin-top:1.05em}
.prose h3{margin-top:1.7em;margin-bottom:.6em;color:var(--gold-soft)}
.prose a{color:var(--gold-soft);border-bottom:1px solid rgba(227,178,75,.45)}
.prose a:hover{border-bottom-color:var(--gold-soft)}

/* ========== 06. 切角面板 ========== */
.panel{
  position:relative;
  background:var(--ink-2);
  border:1px solid var(--line);
  padding:clamp(20px,2.4vw,28px);
  clip-path:polygon(0 0,calc(100% - 20px) 0,100% 20px,100% 100%,0 100%);
}

/* ========== 07. 按钮 / 标签 ========== */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;
  font-family:var(--mono);font-size:var(--fs-sm);letter-spacing:.1em;
  color:var(--ink);background:var(--gold);
  clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,0 100%);
  transition:background .2s ease,color .2s ease;
}
.btn::after{content:"→"}
.btn:hover{background:var(--gold-soft)}
.btn--ghost{
  color:var(--gold-soft);background:transparent;
  box-shadow:inset 0 0 0 1px rgba(227,178,75,.6);
}
.btn--ghost:hover{background:rgba(227,178,75,.14);color:var(--gold-soft)}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;
  color:#7CD0BE;border:1px solid rgba(46,140,122,.5);background:rgba(46,140,122,.12);
}
.tag--gold{color:var(--gold-soft);border-color:rgba(227,178,75,.5);background:rgba(227,178,75,.1)}
.tag--red{color:#F0A08C;border-color:rgba(210,80,60,.55);background:rgba(210,80,60,.14)}

/* ========== 08. 面包屑 ========== */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:18px 0;
  font-family:var(--mono);font-size:var(--fs-xs);letter-spacing:.08em;
  color:var(--stone);
}
.breadcrumb a{color:rgba(243,239,230,.76)}
.breadcrumb a:hover{color:var(--gold-soft)}
.breadcrumb__sep{color:rgba(168,176,191,.5)}
.breadcrumb [aria-current="page"]{color:var(--gold-soft)}

/* ========== 09. 标签页 ========== */
.tabs{display:flex;flex-wrap:wrap;gap:4px;border-bottom:1px solid var(--line)}
.tabs__tab{
  position:relative;
  padding:10px 16px;
  font-family:var(--mono);font-size:var(--fs-sm);letter-spacing:.08em;
  color:rgba(243,239,230,.66);
  border:1px solid transparent;border-bottom:0;
  transition:color .2s ease,background .2s ease;
}
.tabs__tab:hover{color:var(--paper)}
.tabs__tab[aria-selected="true"]{
  color:var(--gold-soft);background:var(--ink-2);border-color:var(--line);
}
.tabs__tab[aria-selected="true"]::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:var(--gold);
}
.tabs__panel{padding-top:clamp(18px,2.4vw,26px)}
.tabs__panel[hidden]{display:none}

/* ========== 10. 图片容器基础 ========== */
.media{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16 / 10;
  background-color:var(--ink-2);
  background-image:linear-gradient(158deg,var(--ink-2),#101d38 58%,#0b1527);
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - 22px) 0,100% 22px,100% 100%,0 100%);
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(168,176,191,.16) 1px,transparent 1px),
    linear-gradient(90deg,rgba(168,176,191,.16) 1px,transparent 1px);
  background-size:52px 52px;
  opacity:.5;
}
.media img,.media picture,.media picture img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:3 / 4}
.media--square{aspect-ratio:1 / 1}
.media--photo::after{opacity:.12}

/* ========== 11. skip link ========== */
.skip-link{
  position:absolute;left:12px;top:-80px;z-index:99;
  padding:10px 16px;
  background:var(--gold);color:var(--char);
  font-family:var(--mono);font-size:var(--fs-sm);letter-spacing:.08em;
  transition:top .2s ease;
}
.skip-link:focus{top:12px}

/* ========== 12. 头部框架 ========== */
.site-header{
  position:relative;z-index:30;
  background:linear-gradient(180deg,rgba(7,12,24,.94),rgba(14,27,51,.86));
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
}
.rail{border-style:solid;border-color:var(--line);border-width:0}
.rail--top{border-bottom-width:1px}
.rail--bottom{border-top-width:1px}
.rail__inner{
  width:min(var(--shell),100% - 40px);
  margin-inline:auto;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:7px 0;
  font-family:var(--mono);font-size:var(--fs-xs);letter-spacing:.08em;
  color:rgba(168,176,191,.82);
}
.rail__inner .coord{color:rgba(227,178,75,.72)}
.rail__note{
  color:rgba(168,176,191,.72);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.rail__inner--bar{display:block;padding:0;height:3px;background:rgba(168,176,191,.12)}
.progress{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--jade) 0%,var(--gold) 55%,var(--cinnabar) 100%);
}
.masthead__inner{
  width:min(var(--shell),100% - 40px);
  margin-inline:auto;
  display:flex;align-items:center;gap:clamp(14px,2.4vw,34px);
  padding:14px 0;
}

/* 品牌 */
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.brand__mark{
  display:grid;grid-template-columns:repeat(3,4px);gap:4px;
  width:20px;justify-items:center;
}
.brand__mark i{display:block;width:4px;height:4px;border-radius:50%;background:var(--gold);opacity:.85}
.brand__mark i:nth-child(4){background:var(--jade)}
.brand__mark i:nth-child(6){background:var(--moss)}
.brand__mark i:nth-child(7){grid-column:1 / -1;background:var(--cinnabar);opacity:.95}
.brand__text{display:flex;flex-direction:column;line-height:1.1}
.brand__name{font-size:clamp(18px,2vw,22px);font-weight:900;letter-spacing:.02em;color:var(--paper)}
.brand__sub{
  font-family:var(--mono);font-size:10px;letter-spacing:.26em;
  color:rgba(227,178,75,.8);margin-top:4px;
}

/* 导航 */
.nav{margin-left:auto}
.nav__list{display:flex;align-items:center;gap:clamp(10px,1.6vw,26px)}
.nav__item{display:block}
.nav__link{
  position:relative;display:inline-block;padding:6px 2px;
  font-size:var(--fs-sm);font-weight:500;letter-spacing:.04em;
  color:rgba(243,239,230,.76);white-space:nowrap;
  transition:color .2s ease;
}
.nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:var(--gold);transform:scaleX(0);transform-origin:left;
  transition:transform .24s ease;
}
.nav__link:hover{color:var(--paper)}
.nav__link:hover::after,.nav__link:focus-visible::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--gold-soft)}
.nav__link[aria-current="page"]::after{transform:scaleX(1);height:2px}
.nav-cta{
  flex:0 0 auto;
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;
  font-family:var(--mono);font-size:var(--fs-xs);letter-spacing:.14em;
  color:var(--gold-soft);
  border:1px solid rgba(227,178,75,.55);
  background:rgba(227,178,75,.08);
  clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,0 100%);
  transition:background .2s ease,color .2s ease;
}
.nav-cta::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--gold);transition:background .2s ease}
.nav-cta:hover{background:var(--gold);color:var(--char)}
.nav-cta:hover::before{background:var(--char)}

/* 移动按钮 */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:8px 11px;
  border:1px solid var(--line-strong);
  color:var(--paper);
  font-family:var(--mono);font-size:var(--fs-xs);letter-spacing:.12em;
}
.nav-toggle__bars{display:grid;gap:3px;width:16px}
.nav-toggle__bars i{display:block;height:1px;background:var(--gold);transition:transform .22s ease,opacity .22s ease}
.nav-toggle__label{color:rgba(243,239,230,.82)}
.site-header[data-open] .nav-toggle__bars i:nth-child(1){transform:translateY(4px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars i:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars i:nth-child(3){transform:translateY(-4px) rotate(-45deg)}

/* ========== 13. 页脚 ========== */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  background:var(--char);
  color:var(--stone);
  border-top:1px solid rgba(227,178,75,.24);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;
  height:clamp(28px,6vw,72px);
  background:var(--ink);
  clip-path:polygon(0 0,100% 0,100% 16%);
  pointer-events:none;
}
.footer__inner{
  position:relative;
  width:min(var(--shell),100% - 40px);
  margin-inline:auto;
  display:grid;
  grid-template-columns:minmax(220px,1fr) minmax(0,2.1fr);
  gap:clamp(28px,5vw,64px);
  padding:clamp(46px,7vw,92px) 0 clamp(26px,4vw,46px);
}
.footer__brand{display:flex;flex-direction:column}
.footer__mark{display:flex;gap:7px;margin-bottom:16px}
.footer__mark i{display:block;width:6px;height:6px;border-radius:50%;background:var(--gold);opacity:.72}
.footer__mark i:nth-child(3n){background:var(--jade);opacity:.85}
.footer__mark i:nth-child(5){background:var(--cinnabar);opacity:.9}
.footer__mark i:nth-child(7){background:var(--gold-soft);opacity:1}
.footer__title{font-size:clamp(26px,3.4vw,36px);font-weight:900;color:var(--paper);line-height:1.2}
.footer__sub{
  margin-top:8px;
  font-family:var(--mono);font-size:var(--fs-xs);letter-spacing:.16em;
  color:rgba(227,178,75,.78);
}
.footer__coord{margin-top:14px;color:rgba(168,176,191,.62)}
.footer__cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,3vw,32px)}
.footer__col-title{
  margin-bottom:12px;
  font-family:var(--mono);font-size:var(--fs-xs);letter-spacing:.18em;
  text-transform:uppercase;color:var(--gold);
}
.footer__links li + li{margin-top:2px}
.footer__links a{
  display:inline-block;padding:4px 0;
  font-size:var(--fs-sm);color:rgba(243,239,230,.74);
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.footer__links a:hover{color:var(--gold-soft);border-bottom-color:rgba(227,178,75,.5)}
.footer__contact{
  margin-top:clamp(24px,4vw,40px);
  padding-top:20px;
  border-top:1px solid var(--line);
  font-family:var(--mono);font-size:var(--fs-sm);line-height:1.95;
  color:rgba(243,239,230,.74);
}
.footer__contact strong{color:var(--gold-soft);font-weight:500;letter-spacing:.04em}
.footer__note{margin-top:10px;color:rgba(168,176,191,.8);font-size:var(--fs-xs);line-height:1.8}
.footer__base{
  width:min(var(--shell),100% - 40px);
  margin-inline:auto;
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px 24px;
  padding:16px 0 24px;
  border-top:1px solid var(--line);
  font-family:var(--mono);font-size:var(--fs-xs);letter-spacing:.06em;
  color:rgba(168,176,191,.8);
}

/* ========== 14. 渐显 ========== */
html.js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .55s ease,transform .55s cubic-bezier(.2,.7,.3,1);
  transition-delay:calc(var(--i,0) * 70ms);
}
html.js [data-reveal].is-in{opacity:1;transform:none}

/* ========== 15. 响应式 ========== */
@media (max-width:1024px){
  .nav__list{gap:12px}
  .nav__link{font-size:13px}
  .footer__inner{grid-template-columns:1fr}
}
@media (max-width:768px){
  .masthead__inner{flex-wrap:wrap;row-gap:10px;padding:12px 0}
  .brand{margin-right:auto}
  .nav-toggle{display:inline-flex;order:2;margin-left:auto}
  .nav-cta{order:3;flex:1 0 100%;justify-content:center}
  .nav{
    order:4;flex:1 0 100%;margin:0;
    display:none;
    border-top:1px solid var(--line);
    padding-top:8px;
  }
  .site-header[data-open] .nav{display:block;animation:navDrop .22s ease both}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__link{
    display:block;padding:13px 6px;
    font-size:var(--fs-body);
    border-bottom:1px solid rgba(168,176,191,.14);
  }
  .nav__link::after{display:none}
  .nav__link[aria-current="page"]{color:var(--gold-soft);padding-left:18px}
  .nav__link[aria-current="page"]::before{
    content:"";position:absolute;left:2px;top:50%;
    width:6px;height:6px;background:var(--gold);
    transform:translateY(-50%) rotate(45deg);
  }
  .rail__note{font-size:11px}
  .footer__cols{grid-template-columns:1fr 1fr}
  .footer__base{flex-direction:column;align-items:flex-start}
}
@media (max-width:480px){
  .shell,.rail__inner,.masthead__inner,.footer__inner,.footer__base{width:calc(100% - 32px)}
  .rail__inner .coord{font-size:10px}
  .footer__cols{grid-template-columns:1fr}
  .brand__sub{letter-spacing:.18em}
}
@keyframes navDrop{
  from{opacity:0;transform:translateY(-8px)}
  to{opacity:1;transform:none}
}

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