/* ============ 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,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg{display:block;max-width:100%}

/* ============ 2. tokens ============ */
:root{
  --night:#0B1B33;
  --night-2:#13294B;
  --snow:#F4F7FB;
  --teal:#2BB3A3;
  --red:#C9473F;
  --yellow:#E8B23A;
  --green:#4E9F6E;
  --white:#FFFFFF;
  --mist:#8FA3BF;
  --ink:#1A1512;

  --line:rgba(143,163,191,.28);
  --line-soft:rgba(143,163,191,.16);
  --panel:rgba(19,41,75,.72);
  --text-dim:rgba(244,247,251,.76);

  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;

  --wrap:1240px;
  --gutter:1.25rem;
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ============ 3. 中文排版与全局底图 ============ */
body{
  min-height:100vh;
  background-color:var(--night);
  background-image:
    linear-gradient(rgba(143,163,191,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(143,163,191,.06) 1px,transparent 1px),
    radial-gradient(120% 82% at 78% -12%,rgba(43,179,163,.16),transparent 58%),
    radial-gradient(80% 60% at 0% 0%,rgba(201,71,63,.10),transparent 55%);
  background-size:72px 72px,72px 72px,100% 100%,100% 100%;
  background-attachment:fixed;
  color:var(--snow);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:500;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.05;letter-spacing:-.02em}
p{max-width:74ch}
strong{font-weight:800;color:var(--white)}
::selection{background:rgba(43,179,163,.35);color:var(--white)}
:focus-visible{outline:2px solid var(--teal);outline-offset:3px;border-radius:1px}

/* ============ 4. 布局基础 ============ */
.container{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.grid{display:grid;gap:1.5rem}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
@media (max-width:900px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:620px){
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
}

.layout-rail{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,9fr);gap:2rem;align-items:start}
.layout-rail__aside{position:sticky;top:calc(112px + 1rem)}
.layout-rail__main{min-width:0}
@media (max-width:960px){
  .layout-rail{grid-template-columns:minmax(0,1fr);gap:1.5rem}
  .layout-rail__aside{position:static;top:auto}
}

/* ============ 5. skip link ============ */
.skip-link{
  position:absolute;left:1rem;top:-120px;z-index:120;
  display:inline-block;padding:.6rem 1rem;
  background:var(--snow);color:var(--night);
  font-weight:800;font-size:.9rem;border-radius:var(--radius);
  transition:top .2s var(--ease);
}
.skip-link:focus{top:.6rem}

/* ============ 6. header ============ */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(11,27,51,.93);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.site-header::before{
  content:"";display:block;height:3px;
  background:linear-gradient(90deg,
    var(--teal) 0 20%,var(--red) 20% 40%,var(--yellow) 40% 60%,
    var(--green) 60% 80%,var(--snow) 80% 100%);
}
.header-top__inner{
  display:flex;align-items:center;gap:1rem;
  padding-block:.85rem;flex-wrap:nowrap;
}
.brand{display:inline-flex;align-items:center;gap:.7rem;flex:0 0 auto}
.brand__mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:38px;height:38px;
  border:1px solid rgba(43,179,163,.55);border-radius:var(--radius);
  background:rgba(43,179,163,.10);
  color:var(--snow);font-family:var(--font-display);font-weight:900;font-size:1.05rem;
}
.brand__text{display:flex;flex-direction:column;line-height:1.25}
.brand__name{font-family:var(--font-display);font-weight:900;font-size:1.05rem;letter-spacing:.01em}
.brand__tag{font-size:11.5px;color:var(--mist);letter-spacing:.06em}
.header-note{
  display:flex;align-items:center;gap:.6rem;
  margin-left:auto;font-size:12px;letter-spacing:.18em;color:var(--mist);white-space:nowrap;
}
.header-note__rule{display:block;width:42px;height:1px;background:var(--mist)}
.header-actions{display:flex;align-items:center;gap:.6rem;margin-left:1rem;flex:0 0 auto}

.cta{
  display:inline-flex;align-items:center;gap:.45rem;
  padding:.55rem 1rem;border-radius:var(--radius);
  font-family:var(--font-body);font-weight:800;font-size:.9rem;letter-spacing:.02em;
  border:1px solid transparent;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.cta--anchor{background:var(--red);color:var(--white);box-shadow:0 10px 24px -18px rgba(201,71,63,.9)}
.cta--anchor:hover{background:#d5564d;color:var(--white)}
.cta--ghost{background:transparent;border-color:var(--line);color:var(--snow)}
.cta--ghost:hover{border-color:var(--teal);color:var(--white)}
.cta__arrow{font-family:var(--font-mono);line-height:1;transform:translateX(0);transition:transform .2s var(--ease)}
.cta:hover .cta__arrow{transform:translateX(3px)}

.nav-toggle{
  display:none;align-items:center;gap:.5rem;
  padding:.5rem .7rem;border:1px solid var(--line);border-radius:var(--radius);
  background:rgba(19,41,75,.7);color:var(--snow);
  font-size:.85rem;font-weight:700;
}
.nav-toggle[aria-expanded="true"]{border-color:var(--teal);color:var(--white)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:11px;color:currentColor}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:100%;height:1.5px;background:currentColor;
}
.nav-toggle__bars::before{top:0;box-shadow:0 4.75px 0 0 currentColor}
.nav-toggle__bars::after{bottom:0}
.nav-toggle__label{letter-spacing:.08em}

.header-nav{
  display:block;
  border-top:1px solid var(--line-soft);
  background:rgba(19,41,75,.55);
}
.header-nav__inner{display:flex;align-items:center;justify-content:space-between;gap:1rem}
.primary-nav{min-width:0}
.primary-nav__list{display:flex;align-items:center;gap:.1rem;overflow-x:auto;scrollbar-width:thin}
.primary-nav__item{flex:0 0 auto}
.primary-nav__link{
  display:inline-flex;align-items:center;
  padding:.8rem 1rem;
  font-size:.95rem;font-weight:700;color:var(--text-dim);
  border-bottom:2px solid transparent;
  white-space:nowrap;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.primary-nav__link:hover{color:var(--white);border-bottom-color:var(--teal)}
.primary-nav__link[aria-current="page"]{
  color:var(--white);
  border-bottom-color:var(--red);
  background:linear-gradient(180deg,transparent,rgba(201,71,63,.14));
}
.nav-index{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.06em;
  color:var(--mist);margin-right:.5rem;
}
.primary-nav__link[aria-current="page"] .nav-index{color:var(--yellow)}
.header-nav__mark{
  font-size:11.5px;letter-spacing:.2em;color:var(--mist);white-space:nowrap;
}

@media (max-width:1100px){
  .header-note{display:none}
}
@media (max-width:900px){
  .header-actions{margin-left:auto}
  .header-note,.header-nav__mark{display:none}
  .nav-toggle{display:inline-flex}
  .header-nav{display:none;max-height:calc(100vh - 72px);overflow-y:auto}
  .site-header[data-open] .header-nav{display:block;border-top-color:var(--line)}
  .header-nav__inner{display:block}
  .primary-nav__list{flex-direction:column;align-items:stretch;overflow:visible;gap:0}
  .primary-nav__link{
    display:flex;width:100%;padding:.95rem 0;
    border-bottom:1px solid var(--line-soft);
    border-left:2px solid transparent;
    font-size:1rem;
  }
  .primary-nav__link:hover{border-bottom-color:var(--line-soft);border-left-color:var(--teal)}
  .primary-nav__link[aria-current="page"]{
    border-bottom-color:var(--line-soft);
    border-left-color:var(--red);
    background:linear-gradient(90deg,rgba(201,71,63,.16),transparent 70%);
  }
}
@media (max-width:420px){
  .brand__tag{display:none}
  .cta--anchor{padding:.5rem .75rem;font-size:.85rem}
}

/* ============ 7. footer ============ */
.site-footer{
  position:relative;margin-top:4rem;
  background:var(--ink);color:var(--snow);
  border-top:1px solid rgba(143,163,191,.2);
}
.footer-rail{display:grid;grid-template-columns:repeat(5,1fr);height:4px}
.footer-rail__seg{display:block;height:100%}
.footer-rail__seg--teal{background:var(--teal)}
.footer-rail__seg--red{background:var(--red)}
.footer-rail__seg--yellow{background:var(--yellow)}
.footer-rail__seg--green{background:var(--green)}
.footer-rail__seg--snow{background:var(--snow)}
.footer-inner{padding-block:2.75rem 2rem}
.footer-grid{
  display:grid;gap:2.25rem 2rem;
  grid-template-columns:1.4fr .9fr .9fr .9fr 1.3fr;
}
.footer-brand__name{font-family:var(--font-display);font-weight:900;font-size:1.35rem;letter-spacing:0}
.footer-brand__tag{margin-top:.35rem;font-size:12px;letter-spacing:.08em;color:var(--mist)}
.footer-brand__note{margin-top:.9rem;font-size:13px;line-height:1.7;color:rgba(244,247,251,.68)}
.footer-col__title{
  font-family:var(--font-body);font-weight:800;
  font-size:12px;letter-spacing:.2em;color:var(--yellow);
  margin-bottom:.85rem;
}
.footer-links li + li{margin-top:.5rem}
.footer-links a{
  display:inline-block;font-size:14px;color:rgba(244,247,251,.78);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-links a:hover{color:var(--white);border-bottom-color:var(--teal)}
.footer-contact__list{display:grid;gap:.6rem}
.footer-contact__row{display:grid;grid-template-columns:3.2rem minmax(0,1fr);gap:.6rem;align-items:start}
.footer-contact__key{font-size:11.5px;letter-spacing:.12em;color:var(--mist);padding-top:.1rem}
.footer-contact__value{font-size:13.5px;color:rgba(244,247,251,.9);overflow-wrap:anywhere}
.footer-legal{
  display:flex;flex-wrap:wrap;gap:.5rem 1.5rem;justify-content:space-between;align-items:baseline;
  margin-top:2.25rem;padding-top:1.1rem;
  border-top:1px solid rgba(143,163,191,.2);
  font-size:12.5px;color:var(--mist);
}
.footer-legal__icp{font-family:var(--font-mono);letter-spacing:.04em}
.footer-legal__copy{font-family:var(--font-body)}
.footer-note{
  margin-top:.9rem;font-size:12px;line-height:1.7;
  color:rgba(143,163,191,.9);max-width:78ch;
}
@media (max-width:1000px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:560px){
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:1.75rem}
  .footer-inner{padding-block:2rem 1.5rem}
  .footer-legal{flex-direction:column;align-items:flex-start}
}

/* ============ 8. 通用内容组件 ============ */
.breadcrumb{font-size:12.5px;letter-spacing:.04em;color:var(--mist)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem}
.breadcrumb__item{display:inline-flex;align-items:center;gap:.45rem}
.breadcrumb__link{color:rgba(244,247,251,.8);border-bottom:1px solid transparent;transition:border-color .2s var(--ease),color .2s var(--ease)}
.breadcrumb__link:hover{color:var(--white);border-bottom-color:var(--teal)}
.breadcrumb__sep{color:rgba(143,163,191,.6);font-family:var(--font-mono)}

.section-head{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:.3rem 1rem;align-items:baseline;margin-bottom:1.75rem;
}
.section-head__index{font-family:var(--font-mono);font-size:.8rem;letter-spacing:.2em;color:var(--yellow)}
.section-head__title{font-size:clamp(1.4rem,2.6vw,2.2rem)}
.section-head__note{grid-column:1 / -1;font-size:.95rem;color:var(--mist);line-height:1.75;max-width:64ch}

.annotation{
  writing-mode:vertical-rl;
  font-family:var(--font-body);font-size:12px;letter-spacing:.32em;
  color:var(--mist);text-transform:none;
}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}

.stamp{
  display:inline-flex;align-items:center;gap:.35rem;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  padding:.2rem .55rem;border-radius:var(--radius);
  color:var(--yellow);background:rgba(232,178,58,.10);
  border:1px solid rgba(232,178,58,.45);white-space:nowrap;
}

.tag{
  display:inline-flex;align-items:center;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  padding:.2rem .55rem;border-radius:var(--radius);
  border:1px solid var(--line);color:var(--mist);background:transparent;
  white-space:nowrap;
}
.tag--teal{color:var(--teal);background:rgba(43,179,163,.12);border-color:rgba(43,179,163,.5)}
.tag--red{color:var(--white);background:rgba(201,71,63,.85);border-color:transparent}
.tag--yellow{color:var(--night);background:var(--yellow);border-color:transparent}
.tag--green{color:var(--night);background:var(--green);border-color:transparent}

.chip{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.42rem .85rem;border-radius:var(--radius);
  border:1px solid var(--line);background:rgba(19,41,75,.6);
  color:rgba(244,247,251,.82);font-size:.85rem;font-weight:700;
  transition:border-color .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease);
}
.chip:hover{border-color:rgba(43,179,163,.7);color:var(--white)}
.chip[aria-pressed="true"],.chip.is-active{
  border-color:var(--teal);background:rgba(43,179,163,.16);color:var(--white);
}

.card{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.5rem;
  box-shadow:0 14px 34px -28px rgba(0,0,0,.95);
  transition:border-color .22s var(--ease),transform .22s var(--ease);
}
.card:hover{border-color:rgba(43,179,163,.65);transform:translateY(-2px)}
.card__title{font-size:1.05rem;font-weight:800;line-height:1.45;letter-spacing:0}
.card__meta{margin-top:.5rem;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--mist)}

.frame{
  position:relative;padding:clamp(1.25rem,3vw,2.5rem);
  border:1px solid var(--line);border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(19,41,75,.58),rgba(11,27,51,.34));
}
.frame::before,.frame::after{
  content:"";position:absolute;width:14px;height:14px;
  border:1px solid rgba(43,179,163,.85);pointer-events:none;
}
.frame::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.frame::after{bottom:-1px;right:-1px;border-left:0;border-top:0}

.slice-track{
  display:flex;gap:1rem;overflow-x:auto;
  scroll-snap-type:x mandatory;
  padding-bottom:1rem;
  scrollbar-color:var(--mist) transparent;
  -webkit-mask-image:linear-gradient(90deg,transparent 0,#000 18px,#000 calc(100% - 18px),transparent 100%);
  mask-image:linear-gradient(90deg,transparent 0,#000 18px,#000 calc(100% - 18px),transparent 100%);
}
.slice{
  flex:0 0 clamp(240px,32%,340px);scroll-snap-align:start;
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.4rem;transition:border-color .22s var(--ease);
}
.slice:hover{border-color:rgba(43,179,163,.65)}
@media (max-width:620px){
  .slice{flex-basis:82%}
}

.timeline{position:relative;padding-left:1.6rem;border-left:1px solid var(--line)}
.timeline__item{position:relative;padding-bottom:1.6rem}
.timeline__item:last-child{padding-bottom:0}
.timeline__node{
  position:absolute;left:calc(-1.6rem - 3px);top:.55rem;
  width:7px;height:7px;background:var(--teal);border-radius:1px;
}
.timeline__time{
  display:block;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.05em;color:var(--yellow);margin-bottom:.2rem;
}

.arrow-link{
  display:inline-flex;align-items:center;gap:.45rem;
  font-size:.95rem;font-weight:700;color:var(--snow);
  padding-bottom:.15rem;border-bottom:1px solid rgba(43,179,163,.5);
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.arrow-link::after{content:"→";color:var(--teal);transition:transform .2s var(--ease)}
.arrow-link:hover{color:var(--white);border-bottom-color:var(--teal)}
.arrow-link:hover::after{transform:translateX(3px)}

.media{
  position:relative;overflow:hidden;
  aspect-ratio:16 / 10;
  border:1px solid var(--line);border-radius:var(--radius);
  background-color:var(--night-2);
  background-image:
    linear-gradient(rgba(143,163,191,.12) 1px,transparent 1px),
    linear-gradient(90deg,rgba(143,163,191,.12) 1px,transparent 1px),
    radial-gradient(120% 100% at 20% 0%,rgba(43,179,163,.22),transparent 60%),
    linear-gradient(180deg,#13294B,#0B1B33);
  background-size:34px 34px,34px 34px,100% 100%,100% 100%;
}
.media img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:3 / 4}
@media (max-width:620px){
  .media--wide{aspect-ratio:16 / 9}
}

/* ============ 9. 动效与滚动进度 ============ */
[data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.is-revealed{opacity:1;transform:none}
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:70;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--teal),var(--yellow),var(--red));
  pointer-events:none;
}

@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;transform:none}
  .card:hover,.slice:hover{transform:none}
  .cta:hover .cta__arrow,.arrow-link:hover::after{transform:none}
}