:root{
  --ink:#0B2A23;
  --char:#111614;
  --cyan:#4FF2D0;
  --orange:#F26A2E;
  --violet:#8B5CF6;
  --stone:#6F7A72;
  --moss:#2F6B52;
  --cream:#F2EEE4;
  --clay:#C97B5A;
  --mist:#BFD8D0;
  --line:rgba(111,122,114,.45);
  --line-soft:rgba(111,122,114,.22);
  --rail-w:218px;
  --header-h:64px;
  --pad:clamp(18px,4vw,48px);
  --font-display:"Barlow Condensed","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.2,.7,.2,1);
  --shadow-hard:6px 6px 0 rgba(0,0,0,.45);
  --shadow-soft:0 18px 40px rgba(0,0,0,.35);
}

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

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}

body{
  margin:0;
  min-height:100vh;
  background-color:var(--char);
  background-image:
    radial-gradient(1100px 540px at 88% -8%,rgba(47,107,82,.42),transparent 62%),
    radial-gradient(780px 440px at -8% 38%,rgba(11,42,35,.92),transparent 68%);
  background-repeat:no-repeat;
  color:var(--cream);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  padding-left:0;
}

img,
svg,
video{display:block;max-width:100%}

button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}

a{color:inherit}

ul,
ol{margin:0;padding:0;list-style:none}

h1,
h2,
h3,
h4,
p,
figure,
blockquote{margin:0}

[hidden]{display:none !important}

::selection{background:var(--cyan);color:#062019}

:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
}

h1,
h2,
h3,
h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.02;
  letter-spacing:-.01em;
  color:var(--cream);
}

h1{font-size:clamp(2.6rem,6.4vw,4.6rem)}
h2{font-size:clamp(1.75rem,3.4vw,2.5rem)}
h3{font-size:clamp(1.15rem,2vw,1.5rem)}

p{max-width:64ch}

#main-content{
  display:block;
  min-height:60vh;
  scroll-margin-top:calc(var(--header-h) + 16px);
}

#main-content:focus{outline:none}

/* 顶部跳转 */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:300;
  padding:.7em 1em;
  background:var(--cyan);
  color:#062019;
  font-family:var(--font-mono);
  font-size:.8rem;
  font-weight:700;
  letter-spacing:.08em;
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
  box-shadow:var(--shadow-hard);
}
.skip-link:focus{transform:translateY(0)}

/* 滚动进度：同时充当页面顶部取景线 */
.scroll-meter{
  position:fixed;
  inset:0 0 auto 0;
  height:3px;
  z-index:120;
  pointer-events:none;
  background:linear-gradient(90deg,rgba(79,242,208,.16),rgba(139,92,246,.16),rgba(242,106,46,.16));
}
.scroll-meter__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 55%,var(--orange));
  transition:width .1s linear;
}

/* 页头：左侧框架导航轨 */
.site-header{
  position:fixed;
  top:0;
  left:0;
  bottom:0;
  z-index:100;
  display:flex;
  flex-direction:column;
  gap:18px;
  width:var(--rail-w);
  padding:26px 16px 18px;
  background:
    linear-gradient(180deg,rgba(79,242,208,.07),transparent 20%),
    linear-gradient(180deg,#0B2A23 0%,#081C17 58%,#0A211C 100%);
  border-right:1px solid var(--line);
  box-shadow:inset -1px 0 0 rgba(0,0,0,.35);
}

.header-bar{
  display:flex;
  flex-direction:column;
  gap:14px;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  color:var(--cream);
  text-decoration:none;
}

.brand-mark{
  display:grid;
  place-items:center;
  flex:0 0 auto;
  width:46px;
  height:46px;
  background:var(--cyan);
  color:#062019;
  font-family:var(--font-mono);
  font-size:1.05rem;
  font-weight:700;
  letter-spacing:-.04em;
  clip-path:polygon(0 0,100% 0,100% 76%,76% 100%,0 100%);
  box-shadow:4px 4px 0 rgba(0,0,0,.35);
}

.brand-text{display:flex;flex-direction:column;gap:2px;min-width:0}

.brand-name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:1.12rem;
  line-height:1.05;
  letter-spacing:.02em;
}

.brand-tag{
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.22em;
  color:var(--cyan);
}

.header-actions{display:flex;flex-direction:column;gap:10px;width:100%}

.cta-quick{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:100%;
  padding:10px 14px;
  background:var(--orange);
  color:#1A0E07;
  font-family:var(--font-display);
  font-weight:800;
  font-size:1rem;
  letter-spacing:.1em;
  text-decoration:none;
  clip-path:polygon(0 0,100% 0,100% 100%,10px 100%,0 calc(100% - 10px));
  transition:background .18s var(--ease),color .18s var(--ease);
}
.cta-quick:hover{background:#FF8248;color:#120A05}
.cta-quick:focus-visible{outline:none;box-shadow:0 0 0 3px rgba(79,242,208,.65)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:8px 10px;
  border:1px solid var(--line);
  background:transparent;
  color:var(--cream);
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.16em;
  line-height:1;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}

.nav-toggle__box{
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:4px;
  width:18px;
  height:14px;
}
.nav-toggle__box span{
  display:block;
  width:100%;
  height:2px;
  background:currentColor;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__box span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__box span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__box span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.site-nav{
  display:flex;
  flex-direction:column;
  gap:8px;
  flex:1;
  min-height:0;
}

.site-nav__kicker{
  margin:0;
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.24em;
  color:var(--stone);
  text-transform:uppercase;
}

.nav-list{
  display:flex;
  flex-direction:column;
  gap:2px;
  flex:1;
  min-height:0;
  overflow-y:auto;
  padding-right:2px;
}

.nav-item{display:block}

.nav-link{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:9px 8px 9px 10px;
  border-left:2px solid transparent;
  color:var(--mist);
  text-decoration:none;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.nav-link:hover{
  background:rgba(79,242,208,.07);
  border-left-color:var(--moss);
  color:var(--cream);
  transform:translateX(2px);
}
.nav-link[aria-current="page"]{
  border-left-color:var(--cyan);
  background:linear-gradient(90deg,rgba(79,242,208,.17),rgba(79,242,208,0));
  color:var(--cyan);
}
.nav-link[aria-current="page"] .nav-num{color:var(--cyan)}
.nav-link[aria-current="page"]::after{
  content:"";
  position:absolute;
  right:7px;
  top:50%;
  width:6px;
  height:6px;
  background:var(--cyan);
  transform:translateY(-50%) rotate(45deg);
}

.nav-num{
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.06em;
  color:var(--stone);
}

.nav-text{
  font-family:var(--font-display);
  font-weight:700;
  font-size:.98rem;
  letter-spacing:.04em;
  line-height:1.2;
}

.nav-utils{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding-top:12px;
  margin-top:4px;
  border-top:1px dashed var(--line);
}

.nav-util{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.06em;
  color:var(--stone);
  text-decoration:none;
  transition:color .18s var(--ease);
}
.nav-util:hover{color:var(--clay)}

/* 页脚：赛后成绩板 */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  padding:clamp(36px,6vw,72px) var(--pad) 28px;
  background:
    linear-gradient(180deg,rgba(79,242,208,.05),transparent 26%),
    linear-gradient(180deg,#0B211C 0%,#081310 62%,#0A1A16 100%);
  border-top:1px solid var(--line);
  color:var(--mist);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  right:0;
  width:min(48%,430px);
  height:4px;
  background:linear-gradient(90deg,transparent,var(--cyan) 46%,var(--violet));
}

.footer-top{
  display:grid;
  gap:clamp(26px,4vw,48px);
  width:100%;
  max-width:1240px;
  margin-inline:auto;
}

.footer-brand{min-width:0}

.footer-mark{
  margin:0;
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(2.4rem,6vw,3.6rem);
  line-height:.92;
  letter-spacing:-.02em;
  color:var(--cream);
}
.footer-mark__sub{
  display:block;
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:.68rem;
  font-weight:400;
  letter-spacing:.24em;
  color:var(--cyan);
}

.footer-summary{
  margin-top:14px;
  max-width:34ch;
  font-size:.94rem;
  line-height:1.8;
  color:var(--mist);
}

.footer-cta{
  display:inline-flex;
  align-items:center;
  gap:.5em;
  margin-top:18px;
  padding:.7em 1.1em;
  border:1px solid var(--orange);
  color:var(--orange);
  font-family:var(--font-display);
  font-weight:700;
  font-size:.96rem;
  letter-spacing:.1em;
  text-decoration:none;
  transition:background .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.footer-cta::after{content:"→";font-family:var(--font-mono);font-size:.9em}
.footer-cta:hover{background:var(--orange);color:#1A0E07;transform:translateX(2px)}

.footer-cols{display:grid;gap:24px}

.footer-col{min-width:0}

.footer-col-title{
  display:flex;
  align-items:baseline;
  gap:8px;
  padding-bottom:8px;
  margin-bottom:10px;
  border-bottom:1px solid var(--line-soft);
  font-family:var(--font-display);
  font-size:1rem;
  font-weight:800;
  letter-spacing:.08em;
  color:var(--cream);
}

.footer-col-num{
  font-family:var(--font-mono);
  font-size:.66rem;
  font-weight:400;
  letter-spacing:.1em;
  color:var(--cyan);
}

.footer-links{display:flex;flex-direction:column;gap:2px}

.footer-link{
  display:inline-block;
  padding:.18em 0;
  border-bottom:1px solid transparent;
  color:var(--mist);
  font-size:.94rem;
  text-decoration:none;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  width:100%;
  max-width:1240px;
  margin:clamp(26px,4vw,48px) auto 0;
  padding-top:18px;
  border-top:1px dashed var(--line);
}

.footer-legal{
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.04em;
  color:var(--mist);
}

.footer-contact{
  font-family:var(--font-mono);
  font-size:.71rem;
  line-height:1.7;
  color:var(--stone);
  word-break:break-word;
}

.to-top{
  position:fixed;
  right:18px;
  bottom:18px;
  z-index:90;
  display:inline-flex;
  align-items:center;
  gap:.5em;
  padding:.68em 1em;
  border:1px solid var(--cyan);
  background:rgba(11,42,35,.96);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  box-shadow:4px 4px 0 rgba(0,0,0,.42);
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s linear,background .18s var(--ease);
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--cyan);color:#062019}

/* 通用正文容器 */
.page-wrap{
  width:100%;
  max-width:1240px;
  margin-inline:auto;
  padding-inline:var(--pad);
}

.band{
  padding-block:clamp(40px,6vw,84px);
  border-top:1px solid var(--line-soft);
}
.band--moss{
  background:linear-gradient(180deg,rgba(47,107,82,.3),rgba(11,42,35,0) 72%);
}

.section-head{
  display:grid;
  gap:12px;
  margin-bottom:clamp(22px,3vw,36px);
  padding-bottom:14px;
  border-bottom:1px solid var(--line);
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.24em;
  color:var(--cyan);
  text-transform:uppercase;
}
.eyebrow::before{content:"";width:18px;height:2px;background:var(--cyan)}

.lede{
  max-width:46ch;
  font-size:clamp(1rem,1.5vw,1.12rem);
  line-height:1.8;
  color:var(--mist);
}

/* 数据模块 */
.data-grid{
  display:grid;
  gap:14px;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
}

.data-card{
  position:relative;
  padding:clamp(16px,2vw,22px);
  border:1px solid var(--line);
  background:linear-gradient(155deg,rgba(47,107,82,.42),rgba(17,22,20,.94) 64%);
  box-shadow:var(--shadow-hard);
}
.data-card::before{
  content:"";
  position:absolute;
  left:-1px;
  top:-1px;
  width:38px;
  height:3px;
  background:var(--cyan);
}
.data-card > * + *{margin-top:10px}

.stat{
  display:flex;
  flex-direction:column;
  gap:2px;
  padding-top:12px;
  border-top:1px solid var(--line-soft);
}

.stat__value{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(1.7rem,3vw,2.4rem);
  line-height:1;
  letter-spacing:-.03em;
  color:var(--cyan);
}

.stat__label{
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.12em;
  color:var(--stone);
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:.4em;
  padding:.22em .55em;
  border:1px solid var(--line);
  background:rgba(255,255,255,.03);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  vertical-align:middle;
}
.tag--orange{color:var(--orange);border-color:rgba(242,106,46,.55);background:rgba(242,106,46,.1)}
.tag--violet{color:var(--violet);border-color:rgba(139,92,246,.55);background:rgba(139,92,246,.12)}
.tag--clay{color:var(--clay);border-color:rgba(201,123,90,.55);background:rgba(201,123,90,.12)}

.note{
  padding:14px 16px;
  border-left:4px solid var(--clay);
  background:rgba(201,123,90,.12);
  color:var(--cream);
  font-size:.94rem;
  line-height:1.75;
}

/* 通用按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  padding:.78em 1.25em;
  border:1px solid var(--line);
  background:transparent;
  color:var(--cream);
  font-family:var(--font-display);
  font-weight:700;
  font-size:1rem;
  letter-spacing:.08em;
  line-height:1.2;
  text-decoration:none;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease);
}
.btn:hover{transform:translate(-2px,-2px)}
.btn--primary{
  background:var(--orange);
  border-color:var(--orange);
  color:#1A0E07;
  box-shadow:4px 4px 0 rgba(0,0,0,.35);
}
.btn--primary:hover{background:#FF8248;box-shadow:6px 6px 0 rgba(0,0,0,.42)}
.btn--ghost{
  border-color:var(--cyan);
  background:rgba(79,242,208,.06);
  color:var(--cyan);
}
.btn--ghost:hover{background:rgba(79,242,208,.14)}
.btn:focus-visible{outline:none;box-shadow:0 0 0 3px rgba(79,242,208,.55)}

/* 面包屑 */
.crumb{
  display:flex;
  flex-wrap:wrap;
  gap:.5em;
  margin:0 0 1.5rem;
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.08em;
  color:var(--stone);
}
.crumb li::after{content:"/";margin-left:.5em;color:var(--line)}
.crumb li:last-child::after{content:none}
.crumb a{color:var(--mist);text-decoration:none}
.crumb a:hover{color:var(--cyan)}
.crumb [aria-current="page"]{color:var(--cyan)}

/* 章节跟随目录 */
.chapter-nav{
  display:flex;
  flex-direction:column;
  gap:2px;
  padding-left:10px;
  border-left:1px solid var(--line);
}
.chapter-nav a{
  position:relative;
  display:block;
  padding:4px 0;
  color:var(--stone);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  text-decoration:none;
  transition:color .18s var(--ease);
}
.chapter-nav a:hover{color:var(--cream)}
.chapter-nav a[aria-current="true"]{color:var(--cyan)}
.chapter-nav a[aria-current="true"]::before{
  content:"";
  position:absolute;
  left:-11px;
  top:50%;
  width:2px;
  height:14px;
  background:var(--cyan);
  transform:translateY(-50%);
}

/* 可复用图像容器 */
.figure-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--line);
  background:
    radial-gradient(120% 120% at 18% 0%,rgba(79,242,208,.18),transparent 58%),
    linear-gradient(150deg,rgba(47,107,82,.5),rgba(11,42,35,.92));
  box-shadow:var(--shadow-hard);
}
.figure-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.92) contrast(1.05);
}
.figure-frame--wide{aspect-ratio:21/9}
.figure-frame--tall{aspect-ratio:3/4}
.figure-frame--square{aspect-ratio:1/1}
.figure-frame__label{
  position:absolute;
  left:0;
  bottom:0;
  padding:4px 8px;
  background:var(--cyan);
  color:#062019;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.12em;
}

/* 进入视口显现 */
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .45s var(--ease),transform .45s var(--ease);
}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* 平板与手机：页头转为吸顶框架，导航成为下拉面板 */
@media (max-width:1079px){
  .site-header{
    position:sticky;
    top:0;
    left:auto;
    bottom:auto;
    width:100%;
    height:auto;
    gap:0;
    padding:0;
    border-right:0;
    border-bottom:1px solid var(--line);
    background:rgba(9,30,25,.97);
    box-shadow:0 10px 30px rgba(0,0,0,.35);
  }

  .header-bar{
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    gap:10px;
    height:var(--header-h);
    padding:0 14px;
  }

  .header-actions{
    flex-direction:row;
    align-items:center;
    gap:8px;
    width:auto;
  }

  .brand{gap:8px}
  .brand-mark{width:38px;height:38px;font-size:.9rem}
  .brand-name{font-size:1rem}
  .brand-tag{font-size:.58rem;letter-spacing:.18em}

  .cta-quick{
    width:auto;
    padding:8px 12px;
    font-size:.86rem;
  }

  .nav-toggle{display:inline-flex}

  .site-nav{
    position:fixed;
    left:0;
    right:0;
    top:var(--header-h);
    z-index:110;
    max-height:calc(100vh - var(--header-h));
    max-height:calc(100dvh - var(--header-h));
    overflow-y:auto;
    overscroll-behavior:contain;
    padding:18px 16px 26px;
    background:linear-gradient(180deg,#0B2A23,#0A211C);
    border-bottom:2px solid var(--cyan);
    box-shadow:0 30px 60px rgba(0,0,0,.55);
    opacity:0;
    visibility:hidden;
    pointer-events:none;
    transform:translateY(-10px);
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s linear;
  }
  .site-nav[data-open]{
    opacity:1;
    visibility:visible;
    pointer-events:auto;
    transform:none;
  }

  .nav-list{overflow:visible;flex:none}
  .nav-link{padding:12px 10px}
  .nav-text{font-size:1.05rem}
  .nav-utils{
    flex-direction:row;
    flex-wrap:wrap;
    gap:14px 20px;
    margin-top:12px;
  }
}

@media (min-width:1080px){
  body{padding-left:var(--rail-w)}
}

@media (min-width:600px){
  .footer-cols{grid-template-columns:repeat(3,minmax(0,1fr))}
}

@media (min-width:860px){
  .footer-top{grid-template-columns:minmax(0,.9fr) minmax(0,1.5fr)}
}

@media (max-width:720px){
  .chapter-nav{
    flex-direction:row;
    gap:16px;
    overflow-x:auto;
    padding:8px 0 0;
    border-left:0;
    border-top:1px solid var(--line);
  }
  .chapter-nav a{white-space:nowrap;padding:4px 0 8px}
  .chapter-nav a[aria-current="true"]::before{
    left:0;
    top:auto;
    bottom:0;
    width:100%;
    height:2px;
    transform:none;
  }
  .footer-bottom{align-items:flex-start;flex-direction:column}
  .to-top{right:14px;bottom: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;
    scroll-behavior:auto !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .scroll-meter__bar{transition:none}
  .to-top{transition:none}
}