:root{
  --ink-900:#0A0E27;
  --ink-800:#131A3A;
  --ink-700:#1B2450;
  --green:#00E676;
  --green-soft:#7CFFB2;
  --green-deep:#0B3D2E;
  --violet:#7C4DFF;
  --violet-deep:#3B2E8C;
  --amber:#FF6D00;
  --wine:#7A1F3D;
  --mist:#F2F5F7;
  --graphite:#2A3040;
  --white:#FFFFFF;
  --text:rgba(242,245,247,.78);
  --text-dim:rgba(242,245,247,.56);
  --line:rgba(124,77,255,.22);
  --line-soft:rgba(242,245,247,.12);
  --radius-lg:40px;
  --radius-md:28px;
  --radius-sm:16px;
  --pill:999px;
  --shell:1280px;
  --gutter:clamp(18px,4vw,48px);
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:120px;
}

body,h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol{margin:0}

body{
  background-color:var(--ink-900);
  background-image:
    radial-gradient(120% 80% at 8% -6%, rgba(124,77,255,.20), transparent 60%),
    radial-gradient(90% 70% at 100% 0%, rgba(0,230,118,.10), transparent 55%);
  background-repeat:no-repeat;
  color:var(--text);
  font-family:var(--font-sans);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(124,77,255,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124,77,255,.055) 1px, transparent 1px);
  background-size:88px 88px;
  mask-image:linear-gradient(180deg, rgba(0,0,0,.9), rgba(0,0,0,.35) 70%, transparent);
  -webkit-mask-image:linear-gradient(180deg, rgba(0,0,0,.9), rgba(0,0,0,.35) 70%, transparent);
}

h1,h2,h3,h4{color:var(--white);font-weight:900;line-height:1.12;letter-spacing:-.02em}
h1{font-size:clamp(40px,7vw,96px)}
h2{font-size:clamp(30px,4.4vw,56px)}
h3{font-size:clamp(21px,2.4vw,30px)}
h4{font-size:clamp(18px,1.8vw,22px)}
p{color:var(--text)}
img,svg,video{max-width:100%}
a{color:inherit}
button{font:inherit}

:focus-visible{outline:2px solid var(--green);outline-offset:3px;border-radius:8px}

.skip-link{
  position:fixed;
  top:-120px;
  left:50%;
  transform:translateX(-50%);
  z-index:200;
  padding:12px 24px;
  border-radius:var(--pill);
  background:var(--green);
  color:#04121f;
  font-weight:700;
  font-size:15px;
  text-decoration:none;
  box-shadow:0 12px 30px rgba(0,230,118,.35);
  transition:top .3s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{top:14px;outline-offset:3px}

/* ============ 悬浮胶囊头部 ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  padding:20px var(--gutter);
  transition:padding .4s var(--ease);
}
.site-header[data-shrunk="true"]{padding-top:10px;padding-bottom:10px}

.header-shell{
  position:relative;
  max-width:1440px;
  margin:0 auto;
  display:flex;
  align-items:center;
  gap:clamp(10px,2vw,26px);
  padding:10px 14px 10px 20px;
  border-radius:var(--pill);
  background:linear-gradient(120deg, rgba(19,26,58,.92), rgba(10,14,39,.86));
  border:1px solid var(--line);
  box-shadow:0 18px 48px rgba(4,8,24,.55), inset 0 1px 0 rgba(242,245,247,.06);
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  transition:padding .4s var(--ease), box-shadow .4s var(--ease), border-color .4s var(--ease);
}
.site-header[data-shrunk="true"] .header-shell{
  padding:6px 12px 6px 16px;
  border-color:rgba(0,230,118,.24);
  box-shadow:0 12px 34px rgba(4,8,24,.72), inset 0 1px 0 rgba(242,245,247,.08);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  text-decoration:none;
  color:var(--mist);
}
.brand-mark{
  position:relative;
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  border-radius:50%;
  background:radial-gradient(circle at 32% 28%, var(--green-soft), var(--green) 48%, var(--green-deep) 100%);
  box-shadow:0 0 0 4px rgba(0,230,118,.12), 0 0 22px rgba(0,230,118,.45);
  flex:0 0 auto;
}
.brand-pulse{
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--ink-900);
}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-name{font-size:17px;font-weight:900;letter-spacing:.02em;color:var(--white)}
.brand-sub{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;color:var(--green-soft);opacity:.92}
.brand--footer .brand-mark{width:40px;height:40px}
.brand--footer .brand-name{font-size:19px}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin-left:auto;
  padding:10px 16px;
  border-radius:var(--pill);
  background:rgba(124,77,255,.14);
  border:1px solid var(--line);
  color:var(--mist);
  font-size:14px;
  font-weight:600;
  letter-spacing:.04em;
  cursor:pointer;
  transition:border-color .25s var(--ease), background .25s var(--ease);
}
.nav-toggle:hover{border-color:rgba(0,230,118,.45);background:rgba(0,230,118,.10)}
.nav-toggle-bars{display:flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bars i{display:block;height:2px;border-radius:2px;background:var(--green);transition:transform .3s var(--ease), opacity .3s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.site-nav{flex:1 1 auto;display:flex;align-items:center;justify-content:center}
.nav-list{display:flex;align-items:center;gap:4px;list-style:none;margin:0;padding:0}
.nav-link{
  display:inline-block;
  padding:10px 16px;
  border-radius:var(--pill);
  color:var(--text);
  font-size:15px;
  font-weight:500;
  letter-spacing:.02em;
  white-space:nowrap;
  text-decoration:none;
  transition:color .25s var(--ease), background .25s var(--ease), box-shadow .25s var(--ease);
}
.nav-link:hover{color:var(--green-soft);background:rgba(0,230,118,.08)}
.nav-link[aria-current="page"]{
  color:#04121f;
  font-weight:700;
  background:linear-gradient(100deg,var(--green),var(--green-soft));
  box-shadow:0 6px 20px rgba(0,230,118,.28);
}

.nav-foot{display:none;flex-direction:column;gap:12px;padding-top:16px;margin-top:14px;border-top:1px solid var(--line-soft)}
.nav-note{margin:0;font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--text-dim)}

.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}

.header-progress{
  position:absolute;
  left:30px;
  right:30px;
  bottom:5px;
  height:2px;
  border-radius:2px;
  background:rgba(242,245,247,.10);
  overflow:hidden;
  pointer-events:none;
}
.header-progress::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(90deg,var(--green),var(--violet) 55%,var(--amber));
  transform:scaleX(var(--progress,0));
  transform-origin:left center;
  transition:transform .12s linear;
}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 26px;
  border:1px solid transparent;
  border-radius:var(--pill);
  font-family:var(--font-sans);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .3s var(--ease), box-shadow .3s var(--ease), background .3s var(--ease), color .3s var(--ease), border-color .3s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn-primary{background:linear-gradient(100deg,var(--green),var(--green-soft));color:#04121f;box-shadow:0 10px 28px rgba(0,230,118,.28)}
.btn-primary:hover{box-shadow:0 16px 36px rgba(0,230,118,.42)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--mist)}
.btn-ghost:hover{border-color:rgba(0,230,118,.5);color:var(--green-soft);box-shadow:0 0 0 1px rgba(0,230,118,.22)}
.btn-violet{background:linear-gradient(100deg,var(--violet),#A78BFF);color:var(--white);box-shadow:0 10px 28px rgba(124,77,255,.3)}
.btn-sm{padding:10px 20px;font-size:14px}
.btn-block{width:100%}

/* ============ 容器与网格 ============ */
.container{width:100%;max-width:var(--shell);margin:0 auto;padding:0 var(--gutter)}
.container--narrow{max-width:880px}
.grid{display:grid;gap:clamp(20px,3vw,40px)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* ============ 章节 ============ */
.chapter{position:relative;padding:clamp(56px,9vw,132px) 0}
.chapter-number{
  display:block;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(46px,6.6vw,80px);
  font-weight:700;
  line-height:1;
  letter-spacing:-.04em;
  color:transparent;
  -webkit-text-stroke:1.4px rgba(0,230,118,.55);
}
.chapter-title{margin:0 0 18px;max-width:22ch}
.chapter-lede{margin:0;max-width:62ch;font-size:17px;color:var(--text)}
.annotation{
  display:inline-block;
  writing-mode:vertical-rl;
  font-size:13px;
  font-weight:500;
  letter-spacing:.3em;
  color:var(--green-soft);
  opacity:.85;
}

/* ============ 卡片与珠宝色分区 ============ */
.card{
  position:relative;
  padding:clamp(22px,3vw,36px);
  border-radius:var(--radius-md);
  background:linear-gradient(150deg, rgba(19,26,58,.92), rgba(10,14,39,.82));
  border:1px solid var(--line);
  box-shadow:0 24px 60px rgba(4,8,24,.45);
  overflow:hidden;
  transition:transform .35s var(--ease), border-color .35s var(--ease), box-shadow .35s var(--ease);
}
.card:hover{
  transform:translateY(-4px);
  border-color:rgba(0,230,118,.36);
  box-shadow:0 30px 70px rgba(4,8,24,.58), 0 0 0 1px rgba(0,230,118,.16);
}
.card-title{margin:0 0 10px;font-size:clamp(19px,2vw,24px);font-weight:900;color:var(--white)}
.card-text{margin:0;font-size:15.5px;color:var(--text)}
.card--flat{box-shadow:none}

.zone-green{background:radial-gradient(120% 100% at 0% 0%, rgba(11,61,46,.92), rgba(10,14,39,.35) 72%)}
.zone-violet{background:radial-gradient(120% 100% at 100% 0%, rgba(59,46,140,.78), rgba(10,14,39,.35) 72%)}
.zone-wine{background:radial-gradient(120% 100% at 0% 100%, rgba(122,31,61,.72), rgba(10,14,39,.35) 72%)}
.zone-amber{background:radial-gradient(120% 100% at 100% 100%, rgba(255,109,0,.28), rgba(10,14,39,.3) 72%)}

/* ============ 数据组件 ============ */
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.01em}
.stat{display:flex;flex-direction:column;gap:6px}
.stat-value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(30px,4.4vw,52px);
  font-weight:700;
  line-height:1;
  color:var(--green);
}
.stat-label{font-size:13px;letter-spacing:.14em;color:var(--text-dim)}

.pill-tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 14px;
  border-radius:var(--pill);
  font-size:13px;
  font-weight:600;
  letter-spacing:.04em;
  color:var(--green-soft);
  background:rgba(0,230,118,.10);
  border:1px solid rgba(0,230,118,.28);
}
.pill-tag--violet{color:#C6B6FF;background:rgba(124,77,255,.14);border-color:rgba(124,77,255,.36)}
.pill-tag--amber{color:#FFB27A;background:rgba(255,109,0,.12);border-color:rgba(255,109,0,.32)}
.pill-tag--wine{color:#FFB0C4;background:rgba(122,31,61,.28);border-color:rgba(122,31,61,.6)}

/* ============ 章节目录跟随 ============ */
.section-directory{
  padding-left:18px;
  border-left:2px solid var(--line-soft);
}
.directory-list{display:flex;flex-direction:column;gap:10px;list-style:none;margin:0;padding:0}
.directory-link{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:14px;
  font-weight:500;
  color:var(--text-dim);
  text-decoration:none;
  transition:color .25s var(--ease), transform .25s var(--ease);
}
.directory-link::before{
  content:"";
  width:6px;
  height:6px;
  border-radius:50%;
  background:rgba(242,245,247,.22);
  transition:background .25s var(--ease), box-shadow .25s var(--ease);
}
.directory-link:hover{color:var(--mist);transform:translateX(3px)}
.directory-link[aria-current="true"]{color:var(--green);font-weight:700}
.directory-link[aria-current="true"]::before{background:var(--green);box-shadow:0 0 0 4px rgba(0,230,118,.16)}

/* ============ 面包屑 ============ */
.breadcrumb{padding:20px 0 0}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  list-style:none;
  margin:0;
  padding:0;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.08em;
  color:var(--text-dim);
}
.breadcrumb-list li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb-list li::after{content:"/";color:rgba(242,245,247,.24)}
.breadcrumb-list li:last-child::after{content:none}
.breadcrumb-link{color:var(--text-dim);text-decoration:none;transition:color .25s var(--ease)}
.breadcrumb-link:hover{color:var(--green-soft)}
.breadcrumb-current{color:var(--green)}

/* ============ 图像容器基础规则 ============ */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/10;
  border-radius:var(--radius-md);
  border:1px solid var(--line);
  background:linear-gradient(150deg, rgba(124,77,255,.16), rgba(0,230,118,.08));
}
.media-frame img{display:block;width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--hero{aspect-ratio:4/3;border-radius:var(--radius-lg)}
.media-frame--circle{border-radius:50%;aspect-ratio:1/1}
.media-caption{
  margin-top:12px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.08em;
  color:var(--text-dim);
}

/* ============ 入场显现 ============ */
[data-reveal]{opacity:1}
.js-ready [data-reveal]{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .48s var(--ease), transform .48s var(--ease);
}
.js-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ============ 页脚 ============ */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:clamp(56px,9vw,120px);
  padding:clamp(48px,7vw,84px) 0 30px;
  background:linear-gradient(180deg, rgba(19,26,58,.94), var(--ink-900) 62%);
  border-top:1px solid var(--line);
}
.footer-track{
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:4px;
  background:linear-gradient(90deg,var(--green) 0%,var(--green-soft) 22%,var(--violet) 52%,var(--amber) 78%,var(--wine) 100%);
  opacity:.88;
}
.footer-shell{
  max-width:var(--shell);
  margin:0 auto;
  padding:0 var(--gutter);
  display:grid;
  grid-template-columns:1.6fr 1fr 1.3fr;
  gap:clamp(28px,4vw,60px);
  align-items:start;
}
.footer-brand{display:flex;flex-direction:column;gap:18px}
.footer-summary{margin:0;max-width:36ch;font-size:15px;line-height:1.7;color:var(--text)}
.badge-list{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.badge-list li{
  padding:7px 14px;
  border-radius:var(--pill);
  font-size:12.5px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--green-soft);
  background:rgba(0,230,118,.08);
  border:1px solid rgba(0,230,118,.22);
}
.footer-title{margin:0 0 18px;font-size:13px;font-weight:700;letter-spacing:.22em;color:var(--white)}
.footer-links{display:flex;flex-direction:column;gap:12px;list-style:none;margin:0;padding:0}
.footer-links a{
  display:inline-block;
  font-size:15px;
  color:var(--text);
  text-decoration:none;
  transition:color .25s var(--ease), transform .25s var(--ease);
}
.footer-links a:hover{color:var(--green-soft);transform:translateX(4px)}
.footer-contact{display:flex;flex-direction:column}
.footer-contact-list{display:flex;flex-direction:column;gap:12px;list-style:none;margin:0 0 16px;padding:0}
.footer-contact-list a{
  font-family:var(--font-mono);
  font-size:14.5px;
  color:var(--mist);
  text-decoration:none;
  border-bottom:1px dashed rgba(124,77,255,.5);
  padding-bottom:2px;
  transition:color .25s var(--ease), border-color .25s var(--ease);
}
.footer-contact-list a:hover{color:var(--green);border-color:var(--green)}
.footer-address{margin:0 0 16px;max-width:30ch;font-size:14.5px;line-height:1.7;color:var(--text)}
.footer-note{
  margin:0;
  max-width:40ch;
  padding-left:14px;
  border-left:2px solid rgba(124,77,255,.5);
  font-size:13px;
  line-height:1.7;
  color:var(--text-dim);
}
.footer-base{
  max-width:var(--shell);
  margin:clamp(36px,5vw,64px) auto 0;
  padding:22px var(--gutter) 0;
  border-top:1px solid var(--line-soft);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px 28px;
}
.footer-copy{margin:0;font-family:var(--font-mono);font-size:13px;color:var(--text-dim)}
.legal-links{display:flex;flex-wrap:wrap;gap:20px;list-style:none;margin:0;padding:0;font-size:14px}
.legal-links a{color:var(--text-dim);text-decoration:none;transition:color .25s var(--ease)}
.legal-links a:hover{color:var(--green-soft)}
.footer-icp{margin:0;font-family:var(--font-mono);font-size:13px;color:var(--text-dim)}

/* ============ 返回顶部 ============ */
.to-top{
  position:fixed;
  right:clamp(16px,3vw,34px);
  bottom:clamp(16px,3vw,34px);
  z-index:70;
  display:grid;
  place-items:center;
  width:56px;
  height:56px;
  padding:0;
  border-radius:50%;
  border:1px solid var(--line);
  background:rgba(19,26,58,.92);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  color:var(--green);
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(14px);
  transition:opacity .35s var(--ease), transform .35s var(--ease), visibility .35s, box-shadow .35s var(--ease);
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{box-shadow:0 0 0 1px rgba(0,230,118,.4), 0 18px 40px rgba(4,8,24,.6)}
.to-top-ring{position:absolute;inset:0;width:100%;height:100%;transform:rotate(-90deg)}
.to-top-track{fill:none;stroke:rgba(242,245,247,.12);stroke-width:2.5}
.to-top-fill{
  fill:none;
  stroke:var(--green);
  stroke-width:2.5;
  stroke-linecap:round;
  stroke-dasharray:119.4;
  stroke-dashoffset:119.4;
  transition:stroke-dashoffset .15s linear;
}
.to-top-icon{
  width:12px;
  height:12px;
  border-left:2px solid currentColor;
  border-top:2px solid currentColor;
  transform:rotate(45deg) translate(1px,1px);
}

/* ============ 响应式 ============ */
@media (max-width:1080px){
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-shell{grid-template-columns:1fr 1fr}
  .footer-contact{grid-column:1 / -1}
}

@media (max-width:1024px){
  .nav-toggle{display:inline-flex}
  .header-actions{display:none}
  .site-nav{
    position:absolute;
    top:calc(100% + 12px);
    left:0;
    right:0;
    flex:0 0 auto;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    padding:18px;
    border-radius:var(--radius-md);
    background:linear-gradient(160deg, rgba(19,26,58,.98), rgba(10,14,39,.98));
    border:1px solid var(--line);
    box-shadow:0 26px 60px rgba(4,8,24,.7);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .3s var(--ease), transform .3s var(--ease), visibility .3s;
  }
  .site-nav[data-open]{opacity:1;visibility:visible;transform:translateY(0)}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{padding:14px 18px;font-size:16px;border-radius:18px}
  .nav-link[aria-current="page"]{box-shadow:none}
  .nav-foot{display:flex}
}

@media (max-width:720px){
  body{font-size:16px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:minmax(0,1fr)}
  .footer-shell{grid-template-columns:minmax(0,1fr)}
  .footer-base{flex-direction:column;align-items:flex-start}
  .header-shell{padding:8px 12px 8px 16px;gap:10px}
  .brand-sub{display:none}
  .header-progress{left:18px;right:18px}
  .breadcrumb{padding-top:14px}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js-ready [data-reveal]{opacity:1;transform:none}
  .btn:hover,.card:hover,.footer-links a:hover,.directory-link:hover{transform:none}
}