/* ============================================================
   08vip赛场 — /assets/site.css
   共享外壳：reset / 设计变量 / 中文排版 / 侧轨 / 页头 / 页脚 / 基础组件
   ============================================================ */

:root{
  --ink-blue:#0A1F44;
  --night-ink:#061530;
  --paper:#F6F1E7;
  --card-white:#FFFDF8;
  --mist:#E4E7EC;
  --lime:#00E676;
  --lake:#2EC4B6;
  --sunset:#FF9F1C;
  --graphite:#101828;
  --lead:#5A6478;
  --ice:#A9C5FF;

  --rail-w:88px;
  --wrap:1280px;
  --pad:28px;

  --edge:2px solid var(--night-ink);
  --hard:6px 6px 0 var(--night-ink);
  --hard-sm:3px 3px 0 var(--night-ink);
  --ease:cubic-bezier(.22,.61,.36,1);
  --fast:.16s;
  --slow:.2s;

  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-display:"Archivo Black","Arial Black","Helvetica Neue",Impact,"PingFang SC",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}

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

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:108px;
}

body{
  margin:0;
  padding-left:var(--rail-w);
  background:var(--paper);
  color:var(--graphite);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  overflow-x:hidden;
}

img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0}
table{border-collapse:collapse}

:focus-visible{outline:3px solid var(--lime);outline-offset:2px}

::selection{background:var(--lime);color:var(--night-ink)}

/* ---------- 跳至正文 ---------- */
.skip-link{
  position:fixed;
  top:12px;
  left:calc(var(--rail-w) + 14px);
  z-index:200;
  padding:10px 18px;
  background:var(--lime);
  color:var(--night-ink);
  font-size:14px;
  font-weight:800;
  letter-spacing:.04em;
  border:var(--edge);
  border-radius:4px;
  transform:translateY(-220%);
  transition:transform var(--slow) var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ============================================================
   左侧品牌轨道
   ============================================================ */
.brand-rail{
  position:fixed;
  top:0;bottom:0;left:0;
  z-index:80;
  width:var(--rail-w);
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:18px;
  padding:20px 0 22px;
  background:linear-gradient(180deg,var(--ink-blue) 0%,var(--night-ink) 100%);
  border-right:2px solid var(--night-ink);
}

.rail-mark{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:6px;
  padding:12px 7px;
  border:2px solid rgba(169,197,255,.34);
  border-radius:4px;
  transition:border-color var(--fast) var(--ease),background-color var(--fast) var(--ease);
}
.rail-mark:hover{border-color:var(--lime);background:rgba(0,230,118,.08)}
.rail-mark-latin{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-display);
  font-size:13px;
  line-height:1;
  letter-spacing:.1em;
  color:var(--lime);
}
.rail-mark-cjk{
  writing-mode:vertical-rl;
  font-size:15px;
  font-weight:800;
  letter-spacing:.22em;
  color:var(--paper);
}

.rail-index{display:flex;flex-direction:column;align-items:center;gap:4px}
.rail-item{display:block}
.rail-node{
  display:block;
  min-width:34px;
  padding:5px 4px;
  text-align:center;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:rgba(169,197,255,.62);
  border-radius:3px;
  transition:color var(--fast) var(--ease),background-color var(--fast) var(--ease);
}
.rail-node:hover{color:var(--lime);background:rgba(0,230,118,.1)}
.rail-node[aria-current="page"]{color:var(--night-ink);background:var(--lime)}

.rail-note{
  margin-top:auto;
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-size:10px;
  letter-spacing:.24em;
  color:rgba(169,197,255,.7);
}

.rail-meter{
  width:5px;
  height:96px;
  background:rgba(169,197,255,.2);
  border-radius:3px;
  overflow:hidden;
}
.rail-meter-fill{
  display:block;
  width:100%;
  height:0;
  background:linear-gradient(180deg,var(--lime),var(--lake));
  transition:height .12s linear;
}

/* ============================================================
   页头刊头
   ============================================================ */
.site-header{
  position:sticky;
  top:0;
  z-index:70;
  background:var(--ink-blue);
  color:var(--paper);
}
.site-header::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:3px;
  background:linear-gradient(90deg,var(--lime) 0%,var(--lake) 46%,var(--sunset) 100%);
}

.masthead{position:relative}
.masthead-inner{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;
  gap:20px;
  max-width:var(--wrap);
  margin:0 auto;
  padding:20px var(--pad);
  transition:padding var(--slow) var(--ease);
}
.site-header[data-scrolled] .masthead-inner{padding-top:10px;padding-bottom:10px}

.masthead-brand{display:flex;flex-direction:column;gap:3px;min-width:0}
.brand{display:inline-flex;align-items:center;gap:9px}
.brand-mark{
  font-family:var(--font-display);
  font-size:19px;
  line-height:1;
  letter-spacing:.02em;
  padding:7px 9px 6px;
  background:var(--lime);
  color:var(--night-ink);
  border-radius:3px;
}
.brand-name{
  font-size:20px;
  font-weight:900;
  letter-spacing:-.01em;
  color:var(--paper);
}
.brand-tag{
  font-size:11px;
  letter-spacing:.2em;
  color:var(--ice);
  opacity:.82;
}

.site-nav{justify-self:center}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{position:relative}
.nav-list a{
  position:relative;
  display:inline-block;
  padding:9px 11px;
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--ice);
  transition:color var(--fast) var(--ease);
}
.nav-list a::after{
  content:"";
  position:absolute;
  left:11px;right:11px;bottom:2px;
  height:3px;
  background:var(--lime);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--slow) var(--ease);
}
.nav-list a:hover{color:var(--paper)}
.nav-list a:hover::after{transform:scaleX(1)}
.nav-list a[aria-current="page"]{color:var(--paper)}
.nav-list a[aria-current="page"]::after{transform:scaleX(1)}

.masthead-actions{display:flex;align-items:center;justify-content:flex-end;gap:10px}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:10px 13px;
  border:2px solid var(--ice);
  border-radius:4px;
  color:var(--paper);
  font-size:13px;
  font-weight:800;
  letter-spacing:.1em;
  transition:border-color var(--fast) var(--ease),color var(--fast) var(--ease),background-color var(--fast) var(--ease);
}
.nav-toggle:hover{border-color:var(--lime);color:var(--lime)}
.nav-toggle-bars{display:flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bar{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform var(--slow) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child{transform:translateY(-3px) rotate(-45deg)}
.nav-toggle-text{line-height:1}

/* ============================================================
   通用按钮
   ============================================================ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 18px;
  border:var(--edge);
  border-radius:4px;
  font-size:14px;
  font-weight:800;
  letter-spacing:.02em;
  line-height:1.15;
  box-shadow:var(--hard-sm);
  transition:transform var(--fast) var(--ease),box-shadow var(--fast) var(--ease),background-color var(--fast) var(--ease),color var(--fast) var(--ease);
}
.btn:hover{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--night-ink)}
.btn:active{transform:translate(3px,3px);box-shadow:0 0 0 var(--night-ink)}
.btn--primary{background:var(--lime);color:var(--night-ink)}
.btn--primary:hover{background:#4cf49c}
.btn--ghost{background:transparent;color:var(--paper);border-color:var(--ice);box-shadow:3px 3px 0 rgba(169,197,255,.4)}
.btn--ghost:hover{background:rgba(169,197,255,.12)}
.btn--dark{background:var(--ink-blue);color:var(--paper)}
.btn--dark:hover{background:var(--night-ink)}
.btn--sunset{background:var(--sunset);color:var(--night-ink)}

.masthead-cta{white-space:nowrap}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  background:var(--night-ink);
  color:var(--ice);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:4px;
  background:linear-gradient(90deg,var(--sunset) 0%,var(--lake) 52%,var(--lime) 100%);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.2fr;
  gap:32px;
  max-width:var(--wrap);
  margin:0 auto;
  padding:58px var(--pad) 38px;
}
.footer-col{min-width:0}
.footer-col--brand{min-width:0}

.footer-brand{display:inline-flex;align-items:center;gap:9px;margin-bottom:14px}
.footer-brand-mark{
  font-family:var(--font-display);
  font-size:17px;
  line-height:1;
  padding:6px 8px;
  background:var(--lime);
  color:var(--night-ink);
  border-radius:3px;
}
.footer-brand-name{font-size:18px;font-weight:900;color:var(--paper)}
.footer-promise{font-size:14px;line-height:1.75;color:rgba(169,197,255,.86);max-width:34ch}
.footer-note{margin-top:10px;font-size:12px;letter-spacing:.04em;color:rgba(169,197,255,.6)}

.footer-title{
  margin:0 0 15px;
  font-size:12px;
  font-weight:800;
  letter-spacing:.2em;
  color:var(--lime);
}
.footer-list{display:grid;gap:11px}
.footer-list a{
  font-size:14px;
  color:var(--ice);
  border-bottom:2px solid transparent;
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease);
}
.footer-list a:hover{color:var(--lime);border-bottom-color:var(--lime)}

.footer-contact{margin-top:12px;font-size:13px;color:rgba(169,197,255,.62)}
.footer-strong{font-family:var(--font-mono);font-size:13px;color:var(--sunset);letter-spacing:.02em}
.footer-address{margin-top:10px;font-size:13px;color:rgba(169,197,255,.62)}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  max-width:var(--wrap);
  margin:0 auto;
  padding:18px var(--pad) 28px;
  border-top:1px solid rgba(169,197,255,.22);
}
.footer-meta,.footer-icp{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:rgba(169,197,255,.68);
}

/* ============================================================
   版心与章节
   ============================================================ */
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--pad)}
.wrap--tight{max-width:980px}

.section{padding:64px 0}
.section--paper{background:var(--paper)}
.section--dark{background:var(--ink-blue);color:var(--paper)}
.section--dark .section-title{color:var(--paper)}
.section--dark .section-lead{color:var(--ice)}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:14px;
  padding-bottom:14px;
  margin-bottom:30px;
  border-bottom:2px solid currentColor;
}
.section-head .section-title{flex:1 1 auto}
.section-index{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--sunset);
}
.section-title{
  font-size:clamp(22px,3vw,32px);
  font-weight:900;
  line-height:1.25;
  letter-spacing:-.01em;
  transform:skewX(-4deg);
  transform-origin:left bottom;
}
.section-lead{
  flex:1 1 100%;
  margin-top:8px;
  font-size:15px;
  line-height:1.8;
  color:var(--lead);
  max-width:62ch;
}
.section-head .section-lead{margin-top:2px}

/* ============================================================
   栅格
   ============================================================ */
.grid{display:grid;gap:26px}
.grid--7-5{grid-template-columns:7fr 5fr}
.grid--8-4{grid-template-columns:8fr 4fr}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:9px;
  padding:16px 0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--lead);
}
.breadcrumb a{
  color:var(--ink-blue);
  border-bottom:2px solid transparent;
  transition:border-color var(--fast) var(--ease),color var(--fast) var(--ease);
}
.breadcrumb a:hover{color:var(--night-ink);border-bottom-color:var(--lime)}
.crumb-sep{color:var(--lead);opacity:.65}
.crumb-current{color:var(--sunset)}

/* ============================================================
   卡片 / 标签 / 数据
   ============================================================ */
.card{
  display:block;
  padding:22px;
  background:var(--card-white);
  border:var(--edge);
  border-radius:4px;
  box-shadow:var(--hard);
  transition:transform var(--slow) var(--ease),box-shadow var(--slow) var(--ease);
}
.card:hover,.card:focus-within{transform:translate(2px,2px);box-shadow:var(--hard-sm)}
.card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}
.card-title{font-size:18px;font-weight:800;line-height:1.4;letter-spacing:-.005em}
.card-body{font-size:15px;line-height:1.8;color:var(--lead)}
.card-foot{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  margin-top:16px;
  padding-top:13px;
  border-top:1px solid var(--mist);
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--lead);
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:2px solid var(--night-ink);
  border-radius:3px;
  background:var(--mist);
  color:var(--night-ink);
  font-size:12px;
  font-weight:800;
  letter-spacing:.06em;
  line-height:1.6;
}
.tag--lime{background:var(--lime)}
.tag--lake{background:var(--lake)}
.tag--sunset{background:var(--sunset)}
.tag--dark{background:var(--night-ink);color:var(--ice);border-color:var(--ice)}

.stat{
  display:flex;
  flex-direction:column;
  gap:3px;
  padding:14px 0;
  border-top:2px solid var(--night-ink);
}
.section--dark .stat{border-top-color:var(--ice)}
.stat-value{
  font-family:var(--font-mono);
  font-size:clamp(24px,3.4vw,34px);
  font-weight:700;
  line-height:1.1;
  letter-spacing:-.02em;
  color:var(--sunset);
}
.stat-label{font-size:12px;letter-spacing:.14em;color:var(--lead)}
.section--dark .stat-label{color:var(--ice)}

/* ============================================================
   数据表
   ============================================================ */
.data-table{
  width:100%;
  background:var(--card-white);
  border:var(--edge);
  box-shadow:var(--hard-sm);
  font-size:14px;
}
.data-table th{
  padding:12px 13px;
  background:var(--ink-blue);
  color:var(--paper);
  font-size:13px;
  font-weight:800;
  letter-spacing:.06em;
  text-align:left;
  border-bottom:2px solid var(--night-ink);
}
.data-table td{
  padding:12px 13px;
  border-bottom:1px solid var(--mist);
  vertical-align:top;
}
.data-table tbody tr:nth-child(even){background:var(--mist)}
.data-table tbody tr:last-child td{border-bottom:0}

/* ============================================================
   旁注 / 编号路线
   ============================================================ */
.note{
  padding:15px 17px;
  background:rgba(46,196,182,.1);
  border-left:4px solid var(--lake);
  border-radius:0 4px 4px 0;
  font-size:14px;
  line-height:1.8;
  color:var(--graphite);
}

.steps{display:grid}
.step{
  display:grid;
  grid-template-columns:56px minmax(0,1fr);
  gap:18px;
  padding:20px 0;
  border-top:2px solid var(--night-ink);
}
.step:last-child{border-bottom:2px solid var(--night-ink)}
.step-num{
  display:flex;
  align-items:center;
  justify-content:center;
  height:42px;
  background:var(--night-ink);
  color:var(--lime);
  border-radius:3px;
  font-family:var(--font-mono);
  font-size:18px;
}
.step-title{font-size:17px;font-weight:800;line-height:1.5}
.step-text{margin-top:4px;font-size:14px;line-height:1.8;color:var(--lead)}

/* ============================================================
   筛选
   ============================================================ */
.filter-bar{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:24px}
.filter-btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 14px;
  background:var(--card-white);
  color:var(--ink-blue);
  border:2px solid var(--night-ink);
  border-radius:3px;
  font-size:13px;
  font-weight:800;
  letter-spacing:.04em;
  box-shadow:3px 3px 0 rgba(6,21,48,.28);
  transition:transform var(--fast) var(--ease),box-shadow var(--fast) var(--ease),background-color var(--fast) var(--ease);
}
.filter-btn:hover{transform:translate(1px,1px);box-shadow:2px 2px 0 rgba(6,21,48,.28)}
.filter-btn[aria-pressed="true"]{background:var(--lime);color:var(--night-ink);box-shadow:3px 3px 0 var(--night-ink)}
.filter-count{font-family:var(--font-mono);font-size:11px;opacity:.75}
.filter-empty{
  padding:26px;
  border:2px dashed var(--lead);
  border-radius:4px;
  text-align:center;
  font-size:14px;
  color:var(--lead);
}
[data-filter-item][hidden]{display:none !important}

.link-more{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding-bottom:2px;
  font-size:14px;
  font-weight:800;
  color:var(--ink-blue);
  border-bottom:2px solid var(--lime);
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease);
}
.link-more:hover{color:var(--night-ink);border-color:var(--sunset)}

/* ============================================================
   图片容器基座（页面阶段放置图片）
   ============================================================ */
.frame{
  position:relative;
  display:block;
  margin:0;
  overflow:hidden;
  background:var(--mist);
  border:var(--edge);
  border-radius:4px;
  box-shadow:var(--hard);
}
.frame img{width:100%;height:100%;object-fit:cover}
.frame--m{box-shadow:var(--hard-sm)}
.frame--cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 30px),calc(100% - 30px) 100%,0 100%)}
.frame--16x9{aspect-ratio:16/9}
.frame--4x3{aspect-ratio:4/3}
.frame--3x2{aspect-ratio:3/2}
.frame--21x9{aspect-ratio:21/9}
.frame__tag{
  position:absolute;
  left:0;bottom:0;
  padding:7px 11px;
  background:var(--night-ink);
  color:var(--lime);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
}
.frame__caption{
  margin-top:10px;
  font-size:12px;
  line-height:1.7;
  color:var(--lead);
}

/* ============================================================
   工具类
   ============================================================ */
.visually-hidden{
  position:absolute !important;
  width:1px;height:1px;
  margin:-1px;
  padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}
.fit{width:100%;display:block}

#main-content{display:block}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1180px){
  .nav-list a{padding:9px 8px;font-size:13.5px}
  .nav-list a::after{left:8px;right:8px}
}

@media (max-width:1024px){
  :root{--pad:22px}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:30px}
}

@media (max-width:900px){
  :root{--rail-w:0px;--pad:16px}

  body{padding-left:0}
  .brand-rail{display:none}
  .skip-link{left:16px}
  html{scroll-padding-top:96px}

  .masthead-inner{grid-template-columns:minmax(0,1fr) auto;gap:12px;padding:14px var(--pad)}
  .site-header[data-scrolled] .masthead-inner{padding-top:10px;padding-bottom:10px}
  .brand-mark{font-size:16px;padding:6px 8px 5px}
  .brand-name{font-size:17px}
  .brand-tag{font-size:10px;letter-spacing:.14em}

  .nav-toggle{display:inline-flex}
  .masthead-cta{display:none}

  .site-nav{
    grid-column:1 / -1;
    display:none;
    margin:12px calc(var(--pad) * -1) -14px;
    padding:8px var(--pad) 16px;
    background:var(--night-ink);
    border-top:2px solid var(--night-ink);
  }
  .site-nav[data-open]{display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list a{
    display:block;
    padding:13px 4px;
    font-size:15px;
    border-bottom:1px solid rgba(169,197,255,.18);
  }
  .nav-list .nav-item:last-child a{border-bottom:0}
  .nav-list a::after{left:4px;right:auto;width:30px;bottom:9px}

  .grid--7-5,.grid--8-4,.grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .section{padding:46px 0}
  .step{grid-template-columns:46px minmax(0,1fr);gap:14px}
}

@media (max-width:560px){
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:26px;padding-top:42px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .section-head{gap:10px}
  .btn{padding:10px 14px;font-size:13px}
}

@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;
  }
  .btn:hover,.card:hover,.card:focus-within,.filter-btn:hover{transform:none}
}