/* ============ 0. 设计令牌 ============ */
:root{
  --white:#FFFFFF;
  --cream:#F5F2EC;
  --night:#0B1B33;
  --night-2:#1E3355;
  --gold:#C9A227;
  --gold-soft:#E8CE7A;
  --gold-ink:#8A6D12;
  --ink:#1A1614;
  --green:#2E7D5B;
  --cyan:#12A5B8;
  --red:#B23A2E;
  --slate:#5A6675;
  --rule:rgba(26,22,20,.14);
  --rule-strong:rgba(26,22,20,.26);
  --rule-dark:rgba(255,255,255,.16);
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --w:1240px;
  --radius:3px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ============ 1. Reset ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--white);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.78;
  letter-spacing:.004em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{width:100%;border-collapse:collapse}
caption{caption-side:bottom;padding-top:10px;font-size:13px;color:var(--slate);text-align:left}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px}

.mono{font-family:var(--font-mono);letter-spacing:.01em;font-variant-numeric:tabular-nums}

/* ============ 2. 容器与章节 ============ */
.container{width:min(100% - 40px,var(--w));margin-inline:auto}
.section{padding:clamp(52px,7vw,104px) 0;position:relative}
.section--tight{padding:clamp(32px,4vw,56px) 0}
.section--paper{background:var(--cream)}
.section--dark{background:var(--night);color:rgba(255,255,255,.88)}
.section--dark .lede,.section--dark .section-kicker{color:rgba(255,255,255,.7)}
.section--dark .section-title{color:#fff}

.section-head{margin-bottom:clamp(24px,3.4vw,46px);position:relative}
.section-index{
  display:block;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.18em;
  color:var(--gold-ink);
  margin-bottom:10px;
}
.section--dark .section-index{color:var(--gold-soft)}
.section-kicker{
  font-size:13px;
  letter-spacing:.16em;
  color:var(--slate);
  text-transform:uppercase;
  margin-bottom:8px;
}
.section-title{
  font-size:clamp(28px,4.6vw,54px);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.12;
  color:var(--night);
}
.section-watermark{
  position:absolute;
  top:-.35em;
  left:-.06em;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(76px,13vw,176px);
  line-height:1;
  color:rgba(11,27,51,.055);
  pointer-events:none;
  user-select:none;
  z-index:0;
}
.lede{
  font-size:clamp(16px,1.55vw,18px);
  line-height:1.8;
  color:var(--slate);
  max-width:64ch;
}
.prose{max-width:68ch;font-size:17px;line-height:1.8}
.prose p+p{margin-top:1.05em}
.prose h3{font-size:22px;font-weight:800;letter-spacing:-.01em;margin:1.6em 0 .5em;color:var(--night)}

/* ============ 3. 网格 ============ */
.grid{display:grid;gap:clamp(16px,2vw,28px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
@media (max-width:900px){
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
}
@media (max-width:560px){
  .grid--12{grid-template-columns:repeat(2,minmax(0,1fr))}
}

.axis-note{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--slate);
}

/* ============ 4. 按钮 ============ */
.btn{
  --btn-bg:var(--night);
  --btn-fg:#fff;
  --btn-bd:transparent;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  border:1px solid var(--btn-bd);
  border-radius:var(--radius);
  background:var(--btn-bg);
  color:var(--btn-fg);
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  white-space:nowrap;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--gold{--btn-bg:var(--gold);--btn-fg:#14110B}
.btn--gold:hover{--btn-bg:var(--gold-soft)}
.btn--gold-line{--btn-bg:transparent;--btn-fg:var(--gold-soft);--btn-bd:rgba(232,206,122,.55)}
.btn--gold-line:hover{--btn-bg:rgba(201,162,39,.16);--btn-bd:var(--gold);--btn-fg:#fff}
.btn--dark{--btn-bg:var(--night);--btn-fg:#fff}
.btn--dark:hover{--btn-bg:var(--night-2)}
.btn--outline{--btn-bg:transparent;--btn-fg:var(--night);--btn-bd:var(--rule-strong)}
.btn--outline:hover{--btn-bd:var(--night);--btn-bg:rgba(11,27,51,.05)}
.btn--sm{padding:8px 14px;font-size:13px}

/* ============ 5. 页头 ============ */
.skip-link{
  position:absolute;
  left:16px;
  top:-64px;
  z-index:200;
  padding:10px 18px;
  background:var(--night);
  color:#fff;
  font-size:14px;
  letter-spacing:.06em;
  border-radius:var(--radius);
  transition:top .2s var(--ease);
}
.skip-link:focus{top:12px}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--white);
  border-bottom:1px solid var(--rule);
  transition:box-shadow .24s var(--ease);
}
.site-header[data-scrolled]{box-shadow:0 10px 26px rgba(11,27,51,.10)}

.scroll-meter{
  position:absolute;
  left:0;
  right:0;
  top:0;
  height:2px;
  background:rgba(11,27,51,.07);
  overflow:hidden;
}
.scroll-meter__bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--gold),var(--gold-soft));
}

.header-rail{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:14px clamp(16px,2.4vw,34px);
  width:min(100% - 40px,var(--w));
  margin-inline:auto;
  padding:18px 0 16px;
}

.brand-mark{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:2px;
  padding-left:14px;
}
.brand-mark::before{
  content:"";
  position:absolute;
  left:0;
  top:3px;
  bottom:3px;
  width:3px;
  background:var(--gold);
  transform:skewY(-8deg);
}
.brand-mark__cn{
  font-size:clamp(20px,2.3vw,24px);
  font-weight:900;
  letter-spacing:.03em;
  line-height:1.1;
  color:var(--night);
}
.brand-mark__sub{
  font-size:11.5px;
  letter-spacing:.15em;
  color:var(--slate);
}

.version-badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid rgba(201,162,39,.5);
  border-radius:var(--radius);
  background:rgba(201,162,39,.09);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--gold-ink);
}
.version-badge__num{font-weight:700;color:var(--gold-ink)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin-left:auto;
  padding:10px 14px;
  border:1px solid var(--rule-strong);
  border-radius:var(--radius);
  font-size:13px;
  font-weight:700;
  letter-spacing:.12em;
  color:var(--night);
}
.nav-toggle__bars{
  position:relative;
  width:18px;
  height:2px;
  background:var(--night);
  transition:background .2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:var(--night);
  transition:transform .24s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}

.site-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:clamp(14px,2.2vw,32px)}
.nav-link{
  position:relative;
  display:inline-block;
  padding:7px 0;
  font-size:15px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--ink);
  white-space:nowrap;
  transition:transform .2s var(--ease),color .2s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:var(--gold);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .24s var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{transform:translateX(2px)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--night)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--gold)}

.status-strip{
  background:linear-gradient(97deg,var(--night) 0%,#0D2140 58%,#123055 100%);
  border-top:1px solid rgba(255,255,255,.07);
  color:rgba(255,255,255,.84);
}
.status-strip__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 22px;
  width:min(100% - 40px,var(--w));
  margin-inline:auto;
  padding:9px 0;
}
.status-strip__group{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.status-strip__group--end{gap:12px}
.status-dot{
  width:7px;height:7px;border-radius:50%;
  background:var(--green);
  animation:pulse 2.4s infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(46,125,91,.55)}
  70%{box-shadow:0 0 0 8px rgba(46,125,91,0)}
  100%{box-shadow:0 0 0 0 rgba(46,125,91,0)}
}
.status-item{font-size:12.5px;letter-spacing:.08em}
.status-item--dim{color:rgba(255,255,255,.58)}
.status-item--mono{font-family:var(--font-mono);letter-spacing:.1em;color:var(--gold-soft)}
.platform-set{display:flex;flex-wrap:wrap;gap:6px}
.platform-chip{
  padding:3px 8px;
  border:1px solid var(--rule-dark);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:rgba(255,255,255,.72);
}

/* ============ 6. 面包屑 ============ */
.breadcrumb{
  padding:18px 0 0;
  font-size:13px;
  letter-spacing:.06em;
  color:var(--slate);
}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.breadcrumb li{display:flex;align-items:center}
.breadcrumb li+li::before{content:"/";margin-right:8px;color:rgba(26,22,20,.28)}
.breadcrumb a{transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--gold-ink)}
.breadcrumb [aria-current="page"]{color:var(--ink);font-weight:600}

/* ============ 7. 档案卡系统 ============ */
.card{
  --card-accent:var(--night-2);
  position:relative;
  padding:24px 22px 26px;
  background:var(--white);
  border:1px solid var(--rule);
  border-radius:var(--radius);
  overflow:hidden;
  transition:transform .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
}
.card::before{
  content:"";
  position:absolute;
  left:0;right:0;top:0;
  height:3px;
  background:var(--card-accent);
}
.card:hover{transform:translateY(-3px);border-color:var(--rule-strong);box-shadow:0 14px 30px rgba(11,27,51,.08)}
.card__fold{
  position:absolute;
  right:0;top:0;
  width:22px;height:22px;
  background:linear-gradient(225deg,var(--cream) 48%,transparent 50%);
}
.card__title{font-size:19px;font-weight:800;letter-spacing:-.01em;color:var(--night);margin-bottom:8px}
.card__body{font-size:15.5px;line-height:1.75;color:var(--slate)}
.card--green{--card-accent:var(--green)}
.card--cyan{--card-accent:var(--cyan)}
.card--gold{--card-accent:var(--gold)}
.card--red{--card-accent:var(--red)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  border:1px solid currentColor;
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--slate);
}
.tag--green{color:var(--green)}
.tag--cyan{color:var(--cyan)}
.tag--gold{color:var(--gold-ink)}
.tag--red{color:var(--red)}
.tag--slate{color:var(--slate)}

.stat{display:flex;flex-direction:column;gap:4px}
.stat__num{
  font-family:var(--font-mono);
  font-size:clamp(29px,4vw,44px);
  font-weight:700;
  line-height:1.05;
  letter-spacing:-.01em;
  color:var(--night);
  font-variant-numeric:tabular-nums;
}
.stat--gold .stat__num{color:var(--gold-ink)}
.stat--cyan .stat__num{color:var(--cyan)}
.stat--green .stat__num{color:var(--green)}
.stat__label{font-size:13px;letter-spacing:.1em;color:var(--slate)}

/* ============ 8. 媒体容器（页面阶段放图） ============ */
.media-frame{
  position:relative;
  width:100%;
  aspect-ratio:16 / 9;
  overflow:hidden;
  border-radius:var(--radius);
  background:linear-gradient(150deg,var(--night) 0%,#16294A 60%,#0E2038 100%);
}
.media-frame > img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:contrast(1.06) saturate(.94);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(255,255,255,.035) 0 1px,transparent 1px 3px),
    radial-gradient(120% 90% at 78% 12%,rgba(201,162,39,.20),transparent 62%);
  mix-blend-mode:screen;
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--portrait{aspect-ratio:3 / 4}
.media-frame__caption{
  margin-top:10px;
  font-size:13px;
  line-height:1.7;
  letter-spacing:.04em;
  color:var(--slate);
}

/* ============ 9. 入场协议 ============ */
[data-reveal]{
  opacity:0;
  transform:translate3d(-12px,12px,0);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ============ 10. 页脚 ============ */
.site-footer{
  position:relative;
  overflow:hidden;
  background:var(--night);
  color:rgba(255,255,255,.78);
  border-top:3px solid var(--gold);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:
    linear-gradient(102deg,rgba(30,51,85,.85) 0%,rgba(11,27,51,0) 55%),
    repeating-linear-gradient(90deg,rgba(255,255,255,.022) 0 1px,transparent 1px 88px);
}
.footer-inner{
  position:relative;
  display:grid;
  grid-template-columns:minmax(230px,.9fr) 2.1fr;
  gap:clamp(28px,4vw,64px);
  width:min(100% - 40px,var(--w));
  margin-inline:auto;
  padding:clamp(40px,5vw,68px) 0 clamp(24px,3vw,36px);
}
.footer-brand{display:flex;flex-direction:column;gap:8px}
.footer-brand__mark{
  font-size:clamp(22px,2.4vw,27px);
  font-weight:900;
  letter-spacing:.03em;
  color:#fff;
  padding-left:13px;
  position:relative;
}
.footer-brand__mark::before{
  content:"";
  position:absolute;
  left:0;top:4px;bottom:4px;
  width:3px;
  background:var(--gold);
  transform:skewY(-8deg);
}
.footer-brand__meta{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:12.5px;
  letter-spacing:.12em;
  color:rgba(255,255,255,.66);
}
.footer-brand__ver{
  font-family:var(--font-mono);
  padding:2px 8px;
  border:1px solid rgba(232,206,122,.5);
  border-radius:2px;
  color:var(--gold-soft);
}
.footer-brand__note{font-size:13px;letter-spacing:.06em;color:rgba(255,255,255,.5)}
.footer-axis{
  position:absolute;
  right:18px;
  top:clamp(40px,5vw,68px);
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.22em;
  color:rgba(232,206,122,.42);
  pointer-events:none;
}
.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.footer-col__title{
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.2em;
  color:var(--gold-soft);
  margin-bottom:14px;
}
.footer-col__list li{margin-bottom:9px}
.footer-col__list a{
  font-size:15px;
  color:rgba(255,255,255,.82);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-col__list a:hover{color:#fff;border-bottom-color:var(--gold)}
.footer-contact{
  grid-column:1 / -1;
  padding-top:clamp(20px,2.6vw,30px);
  border-top:1px solid var(--rule-dark);
}
.footer-contact__list{display:grid;gap:8px;max-width:74ch}
.footer-contact__list li{font-size:14.5px;line-height:1.75;color:rgba(255,255,255,.76)}
.footer-contact__list .mono{color:var(--gold-soft)}
.footer-contact__note{font-size:13px;color:rgba(255,255,255,.52);letter-spacing:.04em}
.footer-base{
  position:relative;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 20px;
  width:min(100% - 40px,var(--w));
  margin-inline:auto;
  padding:16px 0 22px;
  border-top:1px solid rgba(201,162,39,.35);
  font-size:12.5px;
  letter-spacing:.1em;
  color:rgba(255,255,255,.55);
}
.footer-copy{font-family:var(--font-mono)}

/* ============ 11. 响应式 ============ */
@media (max-width:1080px){
  .nav-list{gap:16px}
  .nav-link{font-size:14px}
}
@media (max-width:960px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    flex-basis:100%;
    margin-left:0;
    max-height:0;
    opacity:0;
    visibility:hidden;
    overflow:hidden;
    border-top:1px solid transparent;
    transition:max-height .34s var(--ease),opacity .26s var(--ease),visibility 0s linear .34s;
  }
  .site-nav[data-open]{
    max-height:460px;
    opacity:1;
    visibility:visible;
    margin-top:14px;
    border-top-color:var(--rule);
    transition:max-height .4s var(--ease),opacity .3s var(--ease),visibility 0s;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list__item{width:100%}
  .nav-link{display:block;padding:13px 2px;border-bottom:1px solid var(--rule)}
  .nav-link::after{left:0;right:auto;width:26px;bottom:-1px}
  .nav-link:hover,.nav-link:focus-visible{transform:none}
  .status-strip__inner{justify-content:flex-start}
  .footer-inner{grid-template-columns:1fr}
  .footer-axis{display:none}
}
@media (max-width:700px){
  body{font-size:16px}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}
  .brand-mark__sub{letter-spacing:.1em;font-size:11px}
  .status-item--dim{display:none}
}
@media (max-width:460px){
  .container,.header-rail,.status-strip__inner,.footer-inner,.footer-base{width:min(100% - 28px,var(--w))}
  .footer-cols{grid-template-columns:1fr}
  .platform-set{display:none}
}

/* ============ 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;
  }
  [data-reveal]{opacity:1 !important;transform:none !important}
  .scroll-meter__bar{transition:none}
}