/* =========================================================
   云开看台 · 全站共享样式  /assets/site.css
   ========================================================= */

/* ---------- 变量 ---------- */
:root{
  --ink-950:#05100E;
  --stand-900:#0A1A2B;
  --panel-800:#102420;
  --turf-400:#3DF08A;
  --card-red-500:#FF3B47;
  --amber-400:#FFC24B;
  --mist-050:#E9F3EF;
  --slate-500:#8AA39C;
  --cyan-400:#2AD4C6;
  --gradient-stand:linear-gradient(135deg,#0A1A2B 0%,#102420 45%,rgba(61,240,138,.18) 100%);

  --rail-w:84px;
  --shell-max:1320px;
  --gutter:clamp(16px,3vw,44px);

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

  --line:rgba(138,163,156,.24);
  --line-soft:rgba(138,163,156,.12);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,figcaption,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,picture,svg,video{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--cyan-400);outline-offset:3px}

.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}

/* ---------- 中文排版基座 ---------- */
body{
  min-height:100vh;
  padding-left:var(--rail-w);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--mist-050);
  background-color:var(--ink-950);
  background-image:
    linear-gradient(180deg,rgba(10,26,43,.9) 0%,rgba(5,16,14,0) 520px),
    repeating-linear-gradient(90deg,rgba(138,163,156,.07) 0 1px,transparent 1px 96px),
    repeating-linear-gradient(0deg,rgba(138,163,156,.05) 0 1px,transparent 1px 96px);
}
main{display:block}
#main-content{display:block;scroll-margin-top:150px}

/* ---------- 排版工具类 ---------- */
.t-display{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(3rem,9vw,8.5rem);line-height:.92;letter-spacing:-.02em;
  font-stretch:condensed;
}
.t-h2{font-family:var(--font-display);font-weight:900;font-size:clamp(24px,3vw,44px);line-height:1.15;letter-spacing:-.01em}
.t-h3{font-family:var(--font-display);font-weight:800;font-size:clamp(18px,1.8vw,26px);line-height:1.2}
.t-label{font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--slate-500)}
.t-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1;letter-spacing:.02em}
.lede{font-size:clamp(16px,1.4vw,18.5px);line-height:1.8;max-width:46ch;color:var(--mist-050)}

/* ---------- 容器与栅格 ---------- */
.page-shell{width:100%;max-width:var(--shell-max);margin-inline:auto;padding:clamp(28px,4vw,56px) var(--gutter)}
.grid{display:grid;gap:clamp(16px,2.2vw,28px)}
.grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid--8-4{grid-template-columns:minmax(0,8fr) minmax(0,4fr)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

.section{margin-top:clamp(44px,6vw,88px)}
.section:first-child{margin-top:0}
.section__head{
  display:flex;align-items:flex-end;justify-content:space-between;gap:18px;flex-wrap:wrap;
  padding-bottom:14px;margin-bottom:clamp(20px,2.6vw,32px);
  border-bottom:1px solid var(--line);
}
.section__kicker{
  display:block;margin-bottom:6px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  color:var(--turf-400);text-transform:uppercase;
}
.section__title{font-family:var(--font-display);font-weight:900;font-size:clamp(22px,2.6vw,34px);line-height:1.15}
.section__note{font-size:13px;line-height:1.7;color:var(--slate-500);max-width:36em}
.rule{height:1px;background:var(--line);border:0;margin:clamp(24px,3vw,44px) 0}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:18px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--slate-500);
}
.crumb{color:var(--slate-500);border-bottom:1px solid transparent;transition:color .2s,border-color .2s}
.crumb:hover{color:var(--turf-400);border-bottom-color:var(--turf-400)}
.crumb[aria-current="page"]{color:var(--mist-050)}

/* ---------- 芯片与按钮 ---------- */
.chip-group{
  display:flex;align-items:center;gap:4px;padding:3px;
  border:1px solid var(--line);background:rgba(16,36,32,.6);
}
.chip{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:30px;padding:0 10px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--slate-500);border:1px solid transparent;background:transparent;
  transition:color .2s ease,border-color .2s ease,background-color .2s ease;
  white-space:nowrap;
}
.chip:hover{color:var(--mist-050);border-color:var(--slate-500)}
.chip[aria-pressed="true"]{color:var(--ink-950);background:var(--turf-400);border-color:var(--turf-400);font-weight:700}

.btn{
  position:relative;display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 18px;
  font-family:var(--font-body);font-weight:700;font-size:14px;letter-spacing:.08em;
  color:var(--mist-050);border:1px solid var(--line);background:rgba(16,36,32,.75);
  transition:border-color .22s ease,background-color .22s ease,color .22s ease;
}
.btn:hover{border-color:var(--turf-400)}
.btn--turf{background:var(--turf-400);border-color:var(--turf-400);color:#04140C}
.btn--turf:hover{background:#5CF7A2;border-color:#5CF7A2}
.btn--ghost{background:transparent}
.btn--sm{min-height:34px;padding:0 14px;font-size:12.5px}

/* ---------- 标签与状态点 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;white-space:nowrap;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--slate-500);border:1px solid var(--line);background:rgba(5,16,14,.6);
}
.tag--turf{color:var(--turf-400);border-color:rgba(61,240,138,.42)}
.tag--amber{color:var(--amber-400);border-color:rgba(255,194,75,.44)}
.tag--red{color:var(--card-red-500);border-color:rgba(255,59,71,.46)}

.badge{display:inline-flex;align-items:center;gap:7px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em}
.badge::before{content:"";display:block;width:8px;height:8px;background:var(--slate-500)}
.badge--turf::before{background:var(--turf-400)}
.badge--amber::before{background:var(--amber-400);animation:breathe 2.6s ease-in-out infinite}
.badge--red::before{background:var(--card-red-500);animation:pulse-red 1.2s ease-out infinite}

@keyframes pulse-red{
  0%{box-shadow:0 0 0 0 rgba(255,59,71,.55)}
  70%{box-shadow:0 0 0 7px rgba(255,59,71,0)}
  100%{box-shadow:0 0 0 0 rgba(255,59,71,0)}
}
@keyframes breathe{0%,100%{opacity:1}50%{opacity:.32}}

/* ---------- 面板 / 档案卡 / 数值 ---------- */
.panel{
  position:relative;
  padding:clamp(16px,2vw,24px);
  background:linear-gradient(160deg,rgba(16,36,32,.94),rgba(10,26,43,.94));
  border:1px solid var(--line);
}
.panel::before{content:"";position:absolute;left:0;top:0;width:44px;height:3px;background:var(--turf-400)}

.arc-card{
  position:relative;display:flex;flex-direction:column;gap:10px;
  padding:18px clamp(16px,1.8vw,22px) 20px;
  background:rgba(16,36,32,.72);
  border:1px solid var(--line);
  transition:border-color .24s ease,background-color .24s ease;
}
.arc-card:hover{border-color:var(--turf-400);background:rgba(16,36,32,.94)}
.arc-card__no{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--turf-400)}
.arc-card__title{font-family:var(--font-display);font-weight:800;font-size:19px;line-height:1.28}
.arc-card__body{font-size:14.5px;line-height:1.7;color:var(--slate-500)}
.arc-card__tag{margin-top:auto;align-self:flex-start}

.stat{display:flex;flex-direction:column;gap:4px}
.stat__value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:clamp(28px,3.4vw,44px);line-height:1;color:var(--mist-050)}
.stat__label{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--slate-500)}

/* ---------- 图片容器（页面阶段放图） ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  border:1px solid var(--line);
  aspect-ratio:16/9;
  background:linear-gradient(150deg,#0A1A2B 0%,#102420 55%,rgba(61,240,138,.14) 100%);
}
.media__img{width:100%;height:100%;object-fit:cover}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;padding:10px 14px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--mist-050);
  background:linear-gradient(0deg,rgba(5,16,14,.94),rgba(5,16,14,0));
}
.media__grid{
  position:absolute;inset:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(90deg,rgba(138,163,156,.14) 0 1px,transparent 1px 48px),
    repeating-linear-gradient(0deg,rgba(138,163,156,.1) 0 1px,transparent 1px 48px);
}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:4/5}

/* ---------- 入场 ---------- */
[data-reveal]{opacity:0;transform:translateY(8px);transition:opacity .5s ease,transform .5s cubic-bezier(.2,.8,.2,1)}
[data-reveal].is-in{opacity:1;transform:none}

/* =========================================================
   跳过链接
   ========================================================= */
.skip-link{
  position:fixed;left:calc(var(--rail-w) + 16px);top:-80px;z-index:200;
  padding:12px 18px;font-weight:700;letter-spacing:.06em;
  background:var(--turf-400);color:#04140C;
  transition:top .2s ease;
}
.skip-link:focus{top:16px}

/* =========================================================
   头部
   ========================================================= */
.site-header{
  position:sticky;top:0;z-index:60;
  background:linear-gradient(180deg,#0A1A2B 0%,#071512 62%,#05100E 100%);
  border-bottom:1px solid var(--line);
}

/* 品牌轨道 */
.rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:70;
  display:flex;flex-direction:column;align-items:center;gap:14px;
  padding:18px 0 20px;
  background:linear-gradient(180deg,#0A1A2B 0%,#05100E 64%,#05100E 100%);
  border-right:1px solid var(--line);
}
.rail::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(0deg,rgba(138,163,156,.08) 0 1px,transparent 1px 34px);
}
.rail__brand{
  writing-mode:vertical-rl;text-orientation:mixed;padding-top:6px;
  font-family:var(--font-display);font-weight:900;font-size:15px;letter-spacing:.34em;
  color:var(--mist-050);
}
.rail__rule{width:1px;height:30px;background:linear-gradient(180deg,var(--turf-400),transparent)}
.rail__scale{
  flex:1 1 auto;width:2px;
  background:repeating-linear-gradient(180deg,var(--slate-500) 0 1px,transparent 1px 12px);
  opacity:.5;
}
.rail__round{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--turf-400);border:1px solid rgba(61,240,138,.35);padding:3px 6px;
}
.rail__season{font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;color:var(--slate-500)}

/* 刊头 */
.masthead{
  max-width:var(--shell-max);margin-inline:auto;
  padding:12px var(--gutter) 10px;
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;column-gap:20px;
}
.masthead__stamp{
  grid-column:1;grid-row:1;
  display:flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  color:var(--slate-500);text-transform:uppercase;
}
.masthead__stamp::before{content:"";width:26px;height:1px;background:var(--turf-400)}
.masthead__brand{
  grid-column:2;grid-row:1;min-width:0;
  display:flex;flex-direction:column;align-items:center;gap:4px;
}
.brandmark{display:flex;flex-direction:column;align-items:center;gap:2px;text-align:center}
.brandmark__cn{
  font-family:var(--font-display);font-weight:900;font-stretch:condensed;
  font-size:clamp(26px,3.4vw,40px);line-height:1.05;letter-spacing:.06em;
  color:var(--mist-050);text-shadow:0 0 28px rgba(61,240,138,.18);
}
.brandmark__en{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.34em;
  text-transform:uppercase;color:var(--turf-400);
}
.masthead__sub{font-size:12.5px;letter-spacing:.14em;color:var(--slate-500);text-align:center}
.masthead__utility{
  grid-column:3;grid-row:1;justify-self:end;
  display:flex;align-items:center;justify-content:flex-end;gap:10px;flex-wrap:wrap;
}

/* 汉堡 */
.nav-toggle{
  display:none;position:relative;width:44px;height:44px;
  border:1px solid var(--line);background:rgba(16,36,32,.75);
}
.nav-toggle__bar{
  position:absolute;left:12px;right:12px;height:2px;background:var(--mist-050);
  transition:transform .28s cubic-bezier(.2,.8,.2,1),opacity .2s ease;
}
.nav-toggle__bar:nth-child(1){top:16px}
.nav-toggle__bar:nth-child(2){top:21px}
.nav-toggle__bar:nth-child(3){top:26px}
.site-header[data-open] .nav-toggle__bar:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bar:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bar:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* 栏目带 */
.site-nav{position:relative;background:rgba(5,16,14,.55);border-top:1px solid var(--line-soft)}
.site-nav__list{
  max-width:var(--shell-max);margin-inline:auto;padding:0 var(--gutter);
  display:flex;align-items:center;justify-content:center;flex-wrap:wrap;
  gap:clamp(2px,1.2vw,18px);
}
.site-nav__item{display:flex}
.site-nav__item--cta{display:none}
.site-nav__link{
  display:inline-flex;align-items:center;min-height:44px;padding:0 12px;
  font-size:14px;font-weight:700;letter-spacing:.08em;color:var(--slate-500);
  border-bottom:2px solid transparent;
  transition:color .22s ease,border-color .22s ease,background-color .22s ease;
}
.site-nav__link:hover{color:var(--mist-050);border-bottom-color:var(--slate-500);background:rgba(61,240,138,.05)}
.site-nav__link[aria-current="page"]{color:var(--mist-050);border-bottom-color:var(--turf-400)}
.site-nav__cta{width:100%}

/* 阅读进度 */
.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:var(--turf-400);opacity:.9;
  transform:scaleX(0);transform-origin:left center;
  transition:transform .1s linear;
}

/* =========================================================
   页脚
   ========================================================= */
.site-footer{
  margin-top:clamp(64px,10vw,140px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(10,26,43,0) 0%,rgba(10,26,43,.78) 26%,#0A1A2B 100%);
  color:var(--mist-050);
}
.footer__grid{
  max-width:var(--shell-max);margin-inline:auto;
  padding:clamp(36px,5vw,64px) var(--gutter) clamp(24px,3vw,40px);
  display:grid;grid-template-columns:1.5fr repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,44px);
}
.footer__brand{display:flex;flex-direction:column;gap:10px}
.footer__wordmark{font-family:var(--font-display);font-weight:900;font-size:clamp(24px,2.6vw,32px);line-height:1.1;letter-spacing:.08em}
.footer__tag{font-size:13px;letter-spacing:.1em;color:var(--slate-500)}
.footer__seasons{
  align-self:flex-start;padding:6px 10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  color:var(--turf-400);border:1px solid rgba(61,240,138,.3);
}
.footer__col{display:flex;flex-direction:column;gap:14px}
.footer__col-title{
  padding-bottom:8px;border-bottom:1px solid var(--line-soft);
  font-size:12px;font-weight:700;letter-spacing:.2em;text-transform:uppercase;
  color:var(--slate-500);
}
.footer__list{display:flex;flex-direction:column;gap:10px}
.footer__link{
  display:inline-block;font-size:14px;color:var(--mist-050);
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.footer__link:hover{color:var(--turf-400);border-bottom-color:var(--turf-400)}
.footer__legal{
  max-width:var(--shell-max);margin-inline:auto;
  padding:20px var(--gutter) 34px;
  border-top:1px solid var(--line-soft);
  display:flex;flex-direction:column;gap:6px;
}
.footer__legal-item{font-size:12.5px;line-height:1.7;color:var(--slate-500);word-break:break-word}
.footer__icp{font-family:var(--font-mono);letter-spacing:.08em;color:var(--mist-050)}
.footer__copy{margin-top:6px}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1100px){
  :root{--rail-w:72px}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .masthead__stamp{display:none}
  .masthead__brand{grid-column:1}
}

@media (max-width:900px){
  :root{--rail-w:0px}
  body{padding-left:0}

  /* 轨道折叠为顶部细条 */
  .rail{
    position:static;width:100%;height:auto;flex-direction:row;align-items:center;
    gap:10px;padding:6px var(--gutter);
    border-right:0;border-bottom:1px solid var(--line-soft);
    background:linear-gradient(90deg,#0A1A2B,#05100E);
  }
  .rail::before{display:none}
  .rail__brand{writing-mode:horizontal-tb;padding:0;font-size:11px;letter-spacing:.3em}
  .rail__rule{width:22px;height:1px;background:linear-gradient(90deg,var(--turf-400),transparent)}
  .rail__scale{display:none}
  .rail__round{margin-left:auto}
  .rail__season{display:none}

  .skip-link{left:16px}

  .masthead{
    grid-template-columns:minmax(0,1fr) auto;
    row-gap:8px;padding:10px var(--gutter) 8px;
  }
  .masthead__brand{grid-area:1/1/2/2;align-items:flex-start}
  .brandmark{align-items:flex-start;text-align:left}
  .masthead__sub{text-align:left}
  .nav-toggle{display:block;grid-area:1/2/2/3;justify-self:end;align-self:start}
  .masthead__utility{
    grid-area:2/1/3/3;justify-self:stretch;justify-content:flex-start;
    flex-wrap:nowrap;overflow-x:auto;padding-bottom:2px;
    -webkit-overflow-scrolling:touch;scrollbar-width:none;
  }
  .masthead__utility::-webkit-scrollbar{display:none}
  .masthead__utility .btn{display:none}
  .chip{min-height:44px;padding:0 14px}

  /* 抽屉 */
  .site-nav{
    max-height:0;overflow:hidden;opacity:0;border-top-color:transparent;
    transition:max-height .36s cubic-bezier(.2,.8,.2,1),opacity .24s ease;
  }
  .site-header[data-open] .site-nav{max-height:72vh;overflow-y:auto;opacity:1;border-top-color:var(--line-soft)}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;padding:8px var(--gutter) 16px}
  .site-nav__item{display:block}
  .site-nav__item--cta{display:block;margin-top:10px}
  .site-nav__link{
    min-height:48px;padding:0 12px;font-size:15px;
    border-bottom:0;border-left:3px solid transparent;
  }
  .site-nav__link:hover{background:rgba(61,240,138,.06);border-left-color:var(--slate-500);border-bottom-color:transparent}
  .site-nav__link[aria-current="page"]{background:rgba(61,240,138,.08);border-left-color:var(--turf-400);border-bottom-color:transparent}
  .site-nav__cta{width:100%}

  .grid--7-5,.grid--8-4,.grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .section__head{align-items:flex-start}

  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__brand{grid-column:1 / -1}
}

@media (max-width:560px){
  .footer__grid{grid-template-columns:minmax(0,1fr)}
  .masthead__sub{font-size:11.5px;letter-spacing:.08em}
  .site-footer{margin-top:64px}
}

/* ---------- 动效偏好 ---------- */
@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}
  .scroll-progress{transition:none}
}