*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:5.5rem;}
body,h1,h2,h3,h4,h5,p,ul,ol,li,dl,dd,figure,blockquote{margin:0;padding:0;}
ul,ol{list-style:none;}
a{color:inherit;text-decoration:none;}
button,input,select,textarea{font:inherit;color:inherit;}
button{background:none;border:0;cursor:pointer;}
img,svg,video{display:block;max-width:100%;}

:root{
  --night-pitch:#0B3D2E;
  --deep-turf:#06241B;
  --panel-green:#12523D;
  --glass-layer:rgba(242,247,244,.06);
  --glass-line:rgba(242,247,244,.14);
  --neon-orange:#FF6B35;
  --electric-blue:#00C2FF;
  --card-yellow:#FFD24A;
  --card-red:#FF4D5E;
  --index-sage:#8FA79C;
  --ink-white:#F2F7F4;
  --divider-line:#1E4A3A;
  --rise-teal:#2ED3A0;

  --font-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --rail-w:216px;
  --topbar-h:58px;
  --gap:clamp(1rem,2.4vw,2rem);
  --radius:14px;
  --radius-sm:8px;
  --ease:cubic-bezier(.2,.7,.25,1);
}

body{
  min-height:100vh;
  padding-top:calc(var(--topbar-h) + 3px);
  padding-left:0;
  background-color:var(--night-pitch);
  background-image:
    radial-gradient(1000px 560px at 82% -12%,rgba(0,194,255,.10),transparent 68%),
    radial-gradient(760px 520px at 4% 104%,rgba(255,107,53,.09),transparent 70%);
  background-attachment:fixed;
  color:var(--ink-white);
  font-family:var(--font-sans);
  font-size:1rem;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

:focus-visible{outline:2px solid var(--electric-blue);outline-offset:3px;border-radius:3px;}

/* ---------- 跳转链接 ---------- */
.sy-skip{
  position:fixed;top:.5rem;left:.5rem;z-index:220;
  transform:translateY(-180%);
  padding:.7rem 1.15rem;
  background:var(--neon-orange);
  color:#08281D;
  font-size:.875rem;font-weight:600;
  border-radius:var(--radius-sm);
  transition:transform .2s var(--ease);
}
.sy-skip:focus{transform:translateY(0);}

/* ---------- 通用容器与栅格 ---------- */
.sy-container{width:min(100% - 2.5rem,1180px);margin-inline:auto;}
.sy-grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap);}
.sy-divider{height:1px;border:0;background:var(--divider-line);}
.sy-visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}

/* ---------- 页头：进度条 + 框架导航 ---------- */
.sy-header{position:relative;z-index:100;}

.sy-progress{
  position:fixed;inset:0 0 auto 0;height:3px;
  background:rgba(242,247,244,.07);
  z-index:140;
}
.sy-progress__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--electric-blue),var(--neon-orange));
  box-shadow:0 0 12px rgba(0,194,255,.55);
  transition:width .12s linear;
}

.sy-topbar{
  position:fixed;top:3px;left:0;right:0;height:var(--topbar-h);
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:0 1rem;
  background:rgba(6,36,27,.94);
  border-bottom:1px solid var(--divider-line);
  backdrop-filter:blur(10px);
  z-index:120;
}
.sy-topbar__brand{display:flex;align-items:center;gap:.5rem;min-width:0;}
.sy-topbar__name{font-size:.9rem;font-weight:600;letter-spacing:.05em;}
.sy-topbar__brand-sub{font-size:.625rem;letter-spacing:.22em;color:var(--index-sage);}

.sy-nav-toggle{
  display:inline-flex;align-items:center;gap:.55rem;
  padding:.45rem .8rem;
  border:1px solid var(--divider-line);
  border-radius:999px;
  background:var(--glass-layer);
  font-size:.75rem;letter-spacing:.16em;color:var(--ink-white);
  transition:border-color .2s var(--ease);
}
.sy-nav-toggle:hover{border-color:var(--electric-blue);}
.sy-nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:16px;}
.sy-nav-toggle__bars span{
  display:block;height:2px;border-radius:2px;background:var(--electric-blue);
  transition:transform .24s var(--ease),opacity .24s var(--ease);
}
.sy-nav-toggle[aria-expanded="true"] .sy-nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.sy-nav-toggle[aria-expanded="true"] .sy-nav-toggle__bars span:nth-child(2){opacity:0;}
.sy-nav-toggle[aria-expanded="true"] .sy-nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

.sy-rail{
  background-color:var(--deep-turf);
  background-image:linear-gradient(180deg,#082A20,var(--deep-turf) 55%,#082A20);
  border-right:1px solid var(--divider-line);
}

.sy-rail__brand{
  display:flex;align-items:center;gap:.7rem;
  padding:.35rem 0 .95rem;
  border-bottom:1px solid var(--divider-line);
}
.sy-rail__type{display:flex;flex-direction:column;line-height:1.2;}
.sy-rail__name{font-size:.95rem;font-weight:600;letter-spacing:.06em;}
.sy-rail__sub{font-size:.625rem;letter-spacing:.26em;color:var(--index-sage);}

.sy-mark{
  position:relative;flex:none;width:34px;height:34px;
  border-radius:10px;
  border:1px solid rgba(0,194,255,.5);
  background:
    radial-gradient(circle at 30% 25%,rgba(0,194,255,.35),transparent 62%),
    linear-gradient(145deg,rgba(255,107,53,.28),rgba(6,36,27,.92));
  box-shadow:inset 0 0 14px rgba(0,194,255,.22);
}
.sy-mark::before{
  content:"";position:absolute;inset:0;margin:auto;width:9px;height:9px;border-radius:50%;
  background:var(--neon-orange);box-shadow:0 0 12px var(--neon-orange);
}
.sy-mark::after{
  content:"";position:absolute;inset:0;margin:auto;width:22px;height:22px;border-radius:50%;
  border:1px solid rgba(0,194,255,.35);
}
.sy-mark--sm{width:26px;height:26px;border-radius:8px;}
.sy-mark--sm::before{width:6px;height:6px;}
.sy-mark--sm::after{width:16px;height:16px;}

.sy-nav{display:flex;flex-direction:column;flex:1 1 auto;padding-top:.6rem;}
.sy-nav__eyebrow{font-size:.625rem;letter-spacing:.28em;color:var(--index-sage);padding:.3rem .55rem .7rem;}
.sy-nav__list{display:flex;flex-direction:column;gap:2px;}
.sy-nav__item{display:block;}
.sy-nav__link{
  display:flex;align-items:baseline;gap:.6rem;
  padding:.55rem .6rem;
  border-left:2px solid transparent;
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  color:var(--index-sage);
  font-size:.875rem;
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.sy-nav__index{font-family:var(--font-mono);font-size:.625rem;font-weight:700;letter-spacing:.06em;color:rgba(143,167,156,.72);}
.sy-nav__label{font-weight:500;}
.sy-nav__link:hover{color:var(--ink-white);background:var(--glass-layer);}
.sy-nav__link[aria-current="page"]{
  color:var(--ink-white);
  border-left-color:var(--neon-orange);
  background:linear-gradient(90deg,rgba(255,107,53,.16),rgba(255,107,53,0));
}
.sy-nav__link[aria-current="page"] .sy-nav__index{color:var(--neon-orange);}

.sy-rail__foot{margin-top:auto;padding-top:1rem;border-top:1px solid var(--divider-line);}
.sy-legacy{display:inline-flex;align-items:center;gap:.45rem;font-size:.8125rem;color:var(--electric-blue);}
.sy-legacy__dot{width:6px;height:6px;border-radius:50%;background:var(--electric-blue);box-shadow:0 0 8px var(--electric-blue);}
.sy-legacy__hint{margin-top:.5rem;font-size:.6875rem;line-height:1.7;color:var(--index-sage);}

.sy-scrim{display:none;}

/* ---------- 页脚 ---------- */
.sy-footer{
  margin-top:clamp(3rem,8vw,6rem);
  background-color:var(--deep-turf);
  background-image:
    linear-gradient(rgba(242,247,244,.025) 1px,transparent 1px),
    linear-gradient(90deg,rgba(242,247,244,.025) 1px,transparent 1px),
    linear-gradient(180deg,#082A20,var(--deep-turf));
  background-size:52px 52px,52px 52px,100% 100%;
  border-top:1px solid var(--divider-line);
  color:var(--index-sage);
}
.sy-footer__inner{
  width:min(100% - 2.5rem,1180px);
  margin-inline:auto;
  padding:clamp(2.25rem,5vw,3.5rem) 0 clamp(1.5rem,3vw,2.5rem);
  display:grid;grid-template-columns:1fr;gap:clamp(1.75rem,4vw,3rem);
}
.sy-footer__brand{display:flex;flex-direction:column;gap:1.15rem;}
.sy-footer__logo{display:flex;align-items:center;gap:.7rem;}
.sy-footer__names{display:flex;flex-direction:column;line-height:1.25;}
.sy-footer__name{font-size:1rem;font-weight:600;letter-spacing:.05em;color:var(--ink-white);}
.sy-footer__sub{font-size:.6875rem;letter-spacing:.2em;color:var(--index-sage);}
.sy-footer__cta{display:flex;flex-wrap:wrap;gap:.6rem;}
.sy-footer__contact{display:flex;flex-direction:column;gap:.55rem;}
.sy-footer__contact-row{display:flex;flex-wrap:wrap;align-items:baseline;gap:.35rem .6rem;font-size:.8125rem;}
.sy-footer__contact-label{min-width:4.6rem;font-size:.6875rem;letter-spacing:.18em;color:var(--index-sage);}
.sy-footer__contact-value{color:var(--ink-white);opacity:.9;word-break:break-word;}

.sy-copy{
  padding:.15rem .55rem;
  border:1px solid var(--divider-line);
  border-radius:999px;
  font-size:.6875rem;letter-spacing:.1em;
  color:var(--index-sage);
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.sy-copy:hover{color:var(--electric-blue);border-color:var(--electric-blue);background:var(--glass-layer);}
.sy-copy.is-done{color:var(--rise-teal);border-color:rgba(46,211,160,.6);}

.sy-footer__cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:1.6rem;}
.sy-footer__col{min-width:0;}
.sy-footer__coltitle{
  font-size:.6875rem;font-weight:600;letter-spacing:.24em;color:var(--index-sage);
  padding-bottom:.6rem;margin-bottom:.75rem;border-bottom:1px solid var(--divider-line);
}
.sy-footer__links{display:flex;flex-direction:column;gap:.5rem;}
.sy-footer__link{font-size:.875rem;color:var(--ink-white);opacity:.8;transition:opacity .2s var(--ease),color .2s var(--ease);}
.sy-footer__link:hover{opacity:1;color:var(--electric-blue);}

.sy-footer__meta{border-top:1px solid var(--divider-line);}
.sy-footer__meta-inner{
  width:min(100% - 2.5rem,1180px);
  margin-inline:auto;
  padding:1.1rem 0 1.75rem;
  display:flex;flex-wrap:wrap;align-items:baseline;gap:.5rem 1.5rem;
  font-size:.75rem;color:var(--index-sage);
}
.sy-footer__icp{font-family:var(--font-mono);letter-spacing:.04em;}
.sy-footer__copyright{color:rgba(242,247,244,.78);}
.sy-footer__note{flex:1 1 100%;line-height:1.8;max-width:62ch;}

/* ---------- 返回顶部 ---------- */
.sy-totop{
  position:fixed;right:1.15rem;bottom:1.15rem;z-index:130;
  padding:.55rem .95rem;
  border-radius:999px;
  border:1px solid rgba(0,194,255,.5);
  background:rgba(6,36,27,.9);
  color:var(--electric-blue);
  font-size:.75rem;letter-spacing:.16em;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s;
  backdrop-filter:blur(8px);
}
.sy-totop.is-visible{opacity:1;visibility:visible;transform:none;}

/* ---------- 通用按钮 ---------- */
.sy-btn{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.72rem 1.35rem;
  border:1px solid transparent;border-radius:999px;
  font-size:.875rem;font-weight:600;letter-spacing:.05em;
  transition:transform .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.sy-btn--primary{background:var(--neon-orange);color:#08281D;box-shadow:0 8px 26px rgba(255,107,53,.28);}
.sy-btn--primary:hover{transform:translateY(-2px);}
.sy-btn--ghost{border-color:var(--divider-line);background:var(--glass-layer);color:var(--ink-white);}
.sy-btn--ghost:hover{border-color:var(--electric-blue);color:var(--electric-blue);}

/* ---------- 面包屑 ---------- */
.sy-breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;
  padding:1.35rem 0;
  font-size:.75rem;letter-spacing:.1em;color:var(--index-sage);
}
.sy-breadcrumb a{color:var(--index-sage);transition:color .2s var(--ease);}
.sy-breadcrumb a:hover{color:var(--electric-blue);}
.sy-breadcrumb__sep{color:var(--divider-line);}
.sy-breadcrumb [aria-current="page"]{color:var(--ink-white);}

/* ---------- 面板 ---------- */
.sy-panel{
  position:relative;
  padding:clamp(1.25rem,3vw,2rem);
  background:var(--panel-green);
  border:1px solid var(--divider-line);
  border-radius:var(--radius);
}
.sy-panel--glass{background:var(--glass-layer);border-color:var(--glass-line);backdrop-filter:blur(8px);}
.sy-panel__head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:.5rem .75rem;
  padding-bottom:.85rem;margin-bottom:1.1rem;
  border-bottom:1px solid var(--divider-line);
}
.sy-panel__no{font-family:var(--font-mono);font-size:.6875rem;font-weight:700;letter-spacing:.16em;color:var(--electric-blue);}
.sy-panel__label{font-size:.75rem;letter-spacing:.22em;color:var(--index-sage);}
.sy-panel__meta{margin-left:auto;font-family:var(--font-mono);font-size:.6875rem;color:var(--index-sage);}

/* ---------- 排版辅助 ---------- */
.sy-eyebrow{font-size:.6875rem;letter-spacing:.28em;color:var(--index-sage);text-transform:uppercase;}
.sy-num{font-family:var(--font-mono);font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:-.02em;line-height:1;}
.sy-num--xl{font-size:clamp(3rem,10vw,6rem);line-height:.9;}
.sy-num--lg{font-size:clamp(2rem,5vw,3.25rem);}
.sy-num--sm{font-size:1.05rem;font-weight:700;}
.sy-text-muted{color:var(--index-sage);}
.sy-text-blue{color:var(--electric-blue);}
.sy-text-orange{color:var(--neon-orange);}
.sy-text-teal{color:var(--rise-teal);}
.sy-text-red{color:var(--card-red);}

.sy-chip{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.18rem .6rem;border-radius:999px;
  border:1px solid var(--divider-line);
  background:var(--glass-layer);
  font-size:.6875rem;letter-spacing:.08em;color:var(--index-sage);
}
.sy-chip--blue{border-color:rgba(0,194,255,.5);color:var(--electric-blue);}
.sy-chip--orange{border-color:rgba(255,107,53,.5);color:var(--neon-orange);}
.sy-chip--teal{border-color:rgba(46,211,160,.5);color:var(--rise-teal);}
.sy-chip--yellow{border-color:rgba(255,210,74,.5);color:var(--card-yellow);}
.sy-chip--red{border-color:rgba(255,77,94,.5);color:var(--card-red);}

/* ---------- 图片容器基础规则 ---------- */
.sy-media{
  position:relative;display:block;width:100%;
  aspect-ratio:16/9;
  overflow:hidden;
  border:1px solid var(--divider-line);
  border-radius:var(--radius);
  background-color:var(--deep-turf);
  background-image:
    radial-gradient(circle at 72% 18%,rgba(0,194,255,.16),transparent 58%),
    radial-gradient(circle at 12% 88%,rgba(255,107,53,.14),transparent 60%);
}
.sy-media img{width:100%;height:100%;object-fit:cover;}
.sy-media::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(242,247,244,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(242,247,244,.055) 1px,transparent 1px);
  background-size:44px 44px;
}
.sy-media--wide{aspect-ratio:21/9;}
.sy-media--square{aspect-ratio:1/1;}
.sy-media--tall{aspect-ratio:4/5;}
.sy-media__caption{display:block;margin-top:.6rem;font-size:.75rem;line-height:1.7;color:var(--index-sage);}

/* ---------- 进场显现 ---------- */
html[data-js="on"] [data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .42s var(--ease),transform .42s var(--ease);
}
html[data-js="on"] [data-reveal].is-visible{opacity:1;transform:none;}

/* ---------- 桌面端：框架式左侧索引栏 ---------- */
@media (min-width:960px){
  body{padding-top:0;padding-left:var(--rail-w);}
  .sy-topbar{display:none;}
  .sy-nav-toggle{display:none;}
  .sy-rail{
    position:fixed;top:0;bottom:0;left:0;width:var(--rail-w);
    display:flex;flex-direction:column;
    padding:1.75rem 1.25rem 1.5rem;
    overflow-y:auto;
    z-index:110;
  }
  .sy-scrim{display:none!important;}
}

/* ---------- 移动端：顶栏 + 滑出抽屉 ---------- */
@media (max-width:959px){
  .sy-rail{
    position:fixed;top:0;left:0;bottom:0;
    width:min(86vw,320px);
    display:flex;flex-direction:column;
    padding:1.6rem 1.25rem 1.5rem;
    overflow-y:auto;
    transform:translateX(-104%);
    transition:transform .3s var(--ease);
    box-shadow:24px 0 60px rgba(0,0,0,.55);
    z-index:150;
  }
  .sy-rail[data-open="true"]{transform:translateX(0);}
  .sy-scrim{
    display:block;position:fixed;inset:0;
    background:rgba(6,36,27,.68);
    backdrop-filter:blur(3px);
    opacity:0;visibility:hidden;
    transition:opacity .28s var(--ease),visibility .28s;
    z-index:145;
  }
  .sy-scrim[data-open="true"]{opacity:1;visibility:visible;}
  .sy-nav__link{padding:.7rem .6rem;font-size:.95rem;}
}

/* ---------- 页脚断点 ---------- */
@media (min-width:860px){
  .sy-footer__inner{grid-template-columns:minmax(0,1.05fr) minmax(0,1.5fr);}
}
@media (max-width:560px){
  .sy-totop{right:.75rem;bottom:.75rem;}
  .sy-container,.sy-footer__inner,.sy-footer__meta-inner{width:min(100% - 1.75rem,1180px);}
}

/* ---------- 无障碍降级 ---------- */
@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[data-js="on"] [data-reveal]{opacity:1!important;transform:none!important;}
  .sy-progress__bar{transition:none;}
}